Acronyms, Idioms And Slang: The Evolution Of The English Language. :: essays research papers

Abbreviations, Idioms and Slang: the Evolution of the English Language.      Although the English language is just 1500 years of age, it has advanced at an amazing rate: to such an extent, that, from the outset, the normal individual in America today would discover most Shakespearean writing confounding without the guide of an Old-English word reference or Cliff's Notes. However Shakespear lived only 300 a long time back! Some are seeing this is an indication of the decrease of the English language, that individuals are turning out to be less and less educated. As R. Walker composes in his article "Why English Needs Protecting," "the good and monetary decrease of Incredible Britain in the post-war period has been reflected by a decrease in the English language and literature." I, be that as it may, oppose this idea. I can't help thinking that the purpose of language is to convey †to communicate some thought or trade some type of data with another person. In this sense, the English language appears, not fundamentally to be improving or rotting, yet advancing †getting more effective.      It has been both said and seen that the mechanical advancement of a society will in general develop exponentially instead of straightly. The equivalent can likewise be said of the English language. English is advancing on two levels: socially and mechanically. Also, both of these are unavoidable. Maybe the more perceptible of the two today is the mechanical advancement of English. At the point when the current extent of a given language is deficient to depict another idea, creation, or on the other hand property, at that point there turns into a need to adjust, consolidate, or make words to give a required definition. For instance, the field of Astro-Physics has given the English language such new terms as pulsar, quasar, quark, dark opening, photon, neutrino, positron and so on. Likewise, our general public has as of late be immersed with a heap of new terms from the field of Computer Science: motherboard, hard drive, Internet, megabyte, CD, IDE, SCSI, TCP/IP, WWW, HTTP, DMA, GUI and actually several others abbreviations this specific field is famous for. While a portion of these terms, for example, dark gap and hard drive, are only a blend of prior words, a large number of them are new words inside and out. To me it appears to be certain that anything that serves to expand the scholarly jargon of a general public ought to be invited, in spite of the fact that not all would concur. For instance, many have blamed this pattern for making an abbreviation for everything to be generic and confounding. Furthermore, while I concur that there is actually no compelling reason to condense Kentucky Fried Chicken, it becomes tiring to need to continually say Hypertext Transfer Protocol (HTTP) or Transfer Control Convention/Internet Protocol (TCP/IP) when they are both utilized so habitually when

Barbie Dolls and Their Influence

Barbie and young ladies each have their own particular manner of clarifying or loving toys. They are identified with toys and the manner in which they use them can be very extraordinary. Be that as it may, all things considered, the main thing is that they invest energy with them. That is the reason I need kids to have toys and need toys. This is plausible for the eyes of traders and investors, which they need since they are acceptable open doors for amplifying benefit. Barbie is a brand of extra brands including Mattel dolls and other relatives and collectable dolls. For more than 50 years Barbie is a significant piece of the toy's design doll advertise and has been the subject of numerous discussions and case, frequently including impersonation of dolls and their way of life. Mattel sells more than 1 billion Barbie dolls and is the organization's biggest and most gainful product offering. Nonetheless, deals have strongly declined since 2014. The doll changed the world's rich network toy business by turning into an apparatus for selling related items (adornments, garments, Barbie companions, and so forth.). She has incredible impact on social incentive by telling ladies' self-governance highlights and numerous frill This is a perfect top of the line way of life that can be imparted to affluent companions. Barbie is a model lady? The age has played this doll for quite a while and numerous individuals need to resemble her: party young ladies, proficient ladies and glamorous lady are completely coordinated. In the sonnet entitled Barbie by Marge Piercy, the title tells the subject of that sonnet. Mrs Linde answered, My better half ought not obtain cash without my significant other's assent (Ibsen 88). I as of now imagine that ladies are lower than men, Ibsen is a phony. In Barbie's refrain, the creator Marge Piercy accepts that American Barbie is normally an ideal lady. This shows up reasons, expecting Barbie-like pictures. This doll represents what a lady ought to be and what he is battling for. Barbie causes me to misconstrue the youngsters when I was youthful, I feel strain to act by taking a gander at this unreasonable picture. When pondering the word Barbie, individuals regularly consider her unreasonable figure - full midriff, slender thighs, long legs - however under 2% of American ladies need to arrive at this level It is. Wouldn't everybody like to be this? As we develop we perceive that it is unreasonable and unachievable, however as a kid and as a youthful grown-up it might cause young ladies around the globe to deceive.

Use of sandwich structures - Free Essay Example

CHAPTER 1 INTRODUCTION 1.1 Introduction The use of sandwich structures has been increasing in recent years because of their lightweight and high stiffness. Commonly, the naval industry and transportation uses the E-glass fibers while the aerospace industry uses composite structures such as carbon fiber. The use of sandwich panels with composite facesheet in the naval industry is particularly appealing because they have better corrosion and environmental resistance and reduced magnetic signatures when compared to double-hull construction steel ships. On the other hand, composite sandwich panels are easily susceptible to damage by a strange object impact. The damage may be visible, penetration or perforation, or invisible, internal delamination and debonding. Both types of damages will result in stiffness and strength reduction. It is then important to study the impact behavior of composite sandwich panels. Failure in composite structures can be caused by low, high and extremely high or localized impact. An impact caused by a foreign body initiates two waves from impact point in a panel: a through-thickness wave and a transverse shear wave. Whether or not these waves play an important role in the impact response of the panel depends on the actual contact duration between the projectile and panel and the time it takes the transverse shear wave to reach the panel boundary. Figures 1.1 (a)-(c) show three-impact scenarios: low-velocity, high-velocity and ballistic impact. In low-velocity impact, the contact force duration is long compared to the time it takes the transverse shear wave travel to reach the plate boundary. Many waves reflect back and forth across the side dimension of the panel. In high-velocity impact, the contact force duration is much shorter than the transverse shear wave travel time through the panel. Usually high-velocity impact is the same with perforation and localized damage of the panel. Ballistic impact deals only with through-thickness wave propagation. During ballistic impact, there is complete perforation of the panel with little or no panel deformation. The contact force duration is approximately the wave travel time through the panel thickness. Ballistic impact usually involves the study of penetration mechanics. Low-velocity High-velocity Ballistic Impact The projectile to panel mass ratio will control whether wave propagation effect dominates the panel impact response and then suggested that a mass ratio be use as a parameter to determine impact response. It was shown that small mass impacts produce more damage than high-mass impacts having same kinetic energy. While small-mass impacts were defined by wave-controlled response, large mass impacts were defined by boundary-controlled response. Common examples of low-velocity impact are of bird strikes, collision with floating object, and dropped tools, may cause damage. Underwater blast or debris from a faraway explosion and air was considered as a high-velocity impact situation. Examples of ballistic impact would be a bullet or fragments from a nearby explosion hitting the panel. Another important factor governing the impact on composite structures is the ballistic limit. The ballistic limit is defined as the highest velocity of the projectile to cause perforation. When the residual velocity (exit) of the projectile is zero, then the initial velocity of the projectile that causes perforation is the ballistic limit of the sandwich panel. The ballistic limit may be calculate analytically or determined experimentally. In the experimental method, sandwich panels are shoot with projectiles over narrow range of velocities to either just cause penetration or to just perforate the panel. There exists a striking velocity at which 50% of the panels are completely perforate above this value and remaining 50% are partly penetrate below this value. This striking velocity is expresse as V50, which is the ballistic limit of the panel. In the analytical approach, the ballistic limit is determined by the conservation of energy principle. The approach is complex because it inc ludes a variety of factors like core thickness, facesheet thickness, shape of the projectile, core crushing stress, and so on. 1.2 Problem Statement This topic was an expansion of the Wan Awis research. He has done only an experimental work. For impact application, we need to predict skin and core material thickness. Since impact phenomena depend on numerous parameters such as material properties or projectile geometry, a numerical model, validated experimentally, is necessary to allow the study of the influence of several parameters without making costly experimental tests. This will definitely enhance the development of our military technology and achievements in the future because of the ability of this software to cut production cost and time consuming of the experimental work. The numerical figures have been compared to modal test results aiming mainly to validate the studies. Simulation based on finite element analysis (FEA) must not exceed 15% error or this simulation could be claimed not acceptable. 1.3 Objective To simulate the damage of composite sandwich structures subjected to high-velocity impact using finite element analysis. To determine the energy absorption capability of the components on the behavior of the sandwich panel under impact load using ANSYS AUTODYN 13.0 To validate a numerical model with actual experiment. 1.4 Scope of Works To characterize a mechanical behavior of carbon fiber panel by using tensile and determine the fiber volume force and density. Design and validate the numerical model. Conduct a ballistic impact test simulation. Using the experiments data to calculate the energy absorption on the impact. CHAPTER 2 LITERATURE REVIEW 2.1Introduction A great deal of research has been conducted in the area of impact of composite structures. In this chapter, previous work done on the impact response of laminated composite plates and composite sandwich panels will be reviewed. 2.2Impact of Composite Laminates A detail study of impact of composite laminates in the three impact regimes ballistic impact, low-velocity and high-velocity is presented in this section. 2.2.1Low-velocity Impact Abrate, 1998 give a specific review on different analytical models of impact on composite laminates. He classified impact models into four groups: impact on infinite plate model, energy balance models, spring-mass models, and complete models. In the energy balance model, the initial kinetic energy of the projectile is used to calculate the deformation of the composite laminate. The velocity of the projectile reaches zero at the maximum deflection of the composite laminate. At this point, all of the kinetic energy of the projectile is converted to strain energy needed to deform the composite laminate. Energy balance model assumes that the structure behaves in quasi-static manner. The time history of force and deflection are obtained using the spring-mass model representing the composite laminate. The model shown in Figure 2.1 consists of nonlinear contact stiffness (K), one spring representing the linear stiffness of the structure (Kbs), another spring for the nonlinear membrane stiff ness (Km), effective mass of the structure (M2) as well as the mass of the projectile (M1). Equations of motion are written from a free body diagram. The infinite plate model is used when the deformation wavefront has not reached the boundary but if the wave reaches the plate boundary then this model is not an appropriate one to use. In the complete model, the dynamics of the structure and projectile are taken into explanation. Appropriate plate theory has to be selected and used. In many cases the classical plate theory can be used but when transverse shear deformations become significant, higher-order theories must be used. One of the earliest studies on the impact of composite laminates was by Goldsmith et al, 1995, who conducted high-velocity and quasi-static impact tests on carbon-fiber laminates by using a cylindro-conical projectile. Three different specimen of varying thickness were considered. Energy balance principle was used to predict the dynamic penetration energy, static penetration energy, and also the ballistic limit of the composite laminate. The fiber failure accounted for most of the energy absorbed. The predicted theoretical energy was in good agreement with measured energy for thin laminates but not for the thick laminates. This was approved to the fact that transverse shear deformation played an important responsibility in thick laminates subjected to low-velocity impact. The effect of transverse shear deformation was not dominant due to its quick occurrence in the high-velocity impact of laminates. Therefore, the predicted energy in the dynamic case was always close to but less than the measured energy for the thin and thick laminates. The predicted ballistic limit was less than measured values due to the nonlinear factors. Cantwell, 2007 studied the influence of target geometry in the low-velocity impact of composite laminate. The tests were performed on GFRP plates with hemispherical indenter on either circular or square supports. He used energy-balance model to predict the plate deflection and the delamination area of the laminated structure. His study stated that there is little or no influence of target geometry on the failure modes. It also suggested that delamination was dependent on interlaminar shear stress and increasing the plate diameter required more energy for damage initiation. Hou et al., 2000 predicted impact damage in composite laminates using LSDYNA 3D. The numerical results were compared to experimental results on low-velocity impact on composite laminate with an initial velocity of 7.08 m/s The Chang-Chang failure criteria was modified taking the shear stress into consideration and the model was implemented in DYNA 3D. 2.2.2 High-velocity Impact In 1988, Cantwell performed high-velocity impact tests of CFRP laminates with 6 mm diameter, 1g steel ball as the projectile. The influence of fiber stacking sequence and target geometry was study. The experiments reveal that varying the target geometry had no significance on initial damage caused. While the damage initiated in the distal facesheet in thin laminates, however, in thick laminates it initiated from incident facesheet. Zhao et al., 2007 investigated the failure modes in composite laminates subjected to high-velocity impact. Three different laminates were subject to impact by hemispherical projectile in the range of 10-300 m/s. An energy balance was considered and equations for residual velocity for the laminates were given in terms of the mass of the projectile and striking velocity. The thickness and stacking sequence were finding to play an important role in the energy absorption. Cheng et al., 2007 developed an analytical model based on the spring-mass model for high-velocity impact of a blunt ended and a sharp-ended projectile on thick composite laminates. They considered the effect of moving boundary due to the propagation of shear wave. The analysis was modeled using series of quasi-static events. At the end of each quasi-static step, the failed layers were remove based on punch shear damage and fiber damage criteria, and the wave front was moved outwards. While the first spring stiffness constant was measure based on the penetration depth of the projectile, the second spring stiffness constant was measured based on the bottom node of the plate. 2.2.3 Ballistic Impact Silva et al., 2005 performed numerical simulations of ballistic impact on thin Kevlar 29 composite laminates using a fragment-simulating projectile. The laminate material model was simulating using AUTODYN and the projectile was modeled using Johnson-Cook strength model. Finite element mesh for both laminate and projectile was generating using True Grid. Accurate predictions of ballistic limit (V50) and the failure modes were made. Ballistic limit is the minimum velocity of impact at which a given projectile just perforates a given target. On occasion, the term is also used to identify the maximum impact velocity at which the projectile can penetrate into the target with perforation. It is often defined statistically as the impact velocity for which the projectile has a 50% probability of perforating the target; it is then denoted by V50. Guild et al., 2007 conducted numerical simulations of ballistic impact on composite laminates and compared them with experimental results. The laminates were made of E-glass/vinyl ester resin with varying thickness and ball bearings of varying mass were use as projectiles. The damage modes included fiber failure, matrix failure, penetration, and delamination. Hashin failure criteria was use to determine the damage mode. Delamination was modeled using an interface between the two plies. As the force increased between two nodes above the specified value, the nodes were untied and the delamination increased. The ballistic limit from experiments was in good agreement with numerical results Naik et al., 2008 studied the ballistic impact behavior of thick composites. E-glass/epoxy laminates of varying thickness were subject to high-velocity impact. The effects of projectile diameter, projectile mass and laminate thickness on the ballistic limit were studied. Wave theory and an energy balance were use to predict the ballistic limit of the laminate. The contact duration of the projectile with the laminate was maximum when the initial velocity was equal to ballistic limit and decreased when the initial velocity increased beyond the ballistic limit. Deka et al., 2008 conducted ballisitic impact on E-glass/polypropylene composite laminates with cylinder-shaped projectiles. The experimental results were validating with numerical analysis using LS-DYNA. Although the laminate was modeling in Hypermesh, LS-DYNA was used to analyze failure mechanisms. The analytical model was base on energy conservation and failure in the numerical analysis was predicted based on Hashins failure criteria. 2.3 Impact of Composite Sandwich Panels In this section, a detail study of impact of composite sandwich panels in the three impact regimes low-velocity, high-velocity and ballistic impact is presented. 2.3.1 Low-velocity Impact Mines et al., 1998 investigated quasi-static loading and low-velocity impact behavior on two different composite sandwich panels. While the first panel was made up of E-glass/vinyl ester skin and Coremat core, the second panel was made of Eglass/epoxy skin and aluminium honeycomb core. The first panel with Coremat core had failed in the sequence of core shear, debonding, and distal facesheet damage and incident facesheet failure. The second panel failed by core shear, debonding, incident facesheet failure and then distal facesheet failure later. In the low-velocity impact tests, the failure pattern remained the same in both the panels as of the quasi-static tests. The core properties and impact velocity govern the energy absorption capability of the sandwich panel. Wen et al., 1998 investigated the penetration and perforation of composite laminates and sandwich panels under quasi-static, drop-weight and ballistic impact tests by flat-faced, hemispherical-ended and conical-nosed indenters/projectiles. They categorized the impact on laminates and sandwich panels into low-velocity impact and wave-dominated (high-velocity/ballistic impact) response. It was also stated in the research that sandwich panels subjected to low-velocity impact have similar load-displacement characteristics as of quasi-static loading case. The perforation energy required by flat faced projectile was more than hemispherical-ended and conical shaped projectiles in high-velocity impact. Schubel et al., 2005 investigated quasi-static and low-velocity impact behavior of sandwich panels with woven carbon/epoxy facesheets and PVC foam. The low-velocity impact model behaved similar to quasi-static loading case when loads and strain levels were same. The static indentation response was compared to the numerical results obtained using ABAQUS and were in good agreement. A membrane solution, assuming membrane in the core affected region and plate on elastic foundation in the rest of sandwich panel was in poor agreement with the numerical results. Hoo Fatt et al., 2001, developed static and dynamic models of sandwich panels subjected to low-velocity impact. They investigated the behavior of sandwich panels having carbon/epoxy skins and a Nomex honeycomb core with a hemispherical indenter under various support conditions such as simply supported, fully clamped, and rigidly supported. Spring-mass models were considered to determine the load-displacement curve. They also investigated the damage initiation of sandwich panels under low-velocity impact loading. The initial mode of damage depended upon the panel support conditions, projectile nose shape, geometry of the specimens, and material properties of the facesheet and core. Various failure patterns were studied and solutions based on them were derived separately. The analytical solution for the ballistic limit was also found and results for thick laminates were in better agreement than thin laminates. Suvorov et al., 2005 performed numerical analysis on sandwich panels with foam core and studied the effect of interlayer in between the top facesheet and foam core. The foam core was modeled as crushable foam in ABAQUS. While the polyurethane (PUR) interlayer reduced the deformations in both the core and the composite facesheets, the elastomeric foam (EF) interlayer offered a better protection for the foam core alone. Besant et al., 2001 performed numerical analysis on sandwich panels with aluminium honeycomb core. The metal honeycomb core was modeled as elastic perfectly plastic material. A quadratic yield criterion was proposed for the core material, which included both normal and transverse shear stresses. The importance of core plasticity in finite element analysis was explained. 2.3.2 High-velocity Impact A great deal of work has been done in the area of low-velocity impact of laminates and sandwich panels and high-velocity impact of laminates but limited work has been presented in the domain of high-velocity and ballistic impact of sandwich panels. The following describes some recent studies on the high-velocity impact of composite sandwich panels Velmurugan et al., 2006 studied the projectile impact on composite sandwich panels in the range of 30-100 m/s. The sandwich models in this study were not the typical sandwich panels in the conventional sense. They had a core height comparable to the facesheet thickness and acted as a bonding agent between the facesheets. Energy-balance model was used to determine the ballistic limit of three different sandwich panels. They assumed the sandwich panel as a single plate since the foam layer was thin and comparable to facesheet thickness. Also uniform failure mechanism along the through thickness direction was assumed in their model. Skvortsov et al., 2003 developed an analytical model using energy-balance principle to determine the ballistic limit of composite sandwich panels subjected to high velocity impact. Two different sandwich panels were subjected to high velocity impact using three different projectiles. These tests were conducted on simply supported and rigidly supported boundary conditions, and the initial velocity was varied in the range of 70-95 m/s. The predicted panel energy was close to the experimental values and the error was due to the strain-rate effects, plastic behavior, and hardening phenomena, which are not consider in the analysis. 2.3.3 Ballistic Impact Kepler et al., 2007 conducted ballistic impact on sandwich panels consisting of GFRP plates and Divinycell H80 core, with three different projectiles. Lumped spring mass model was use to calculate force histories and panel response. Concentric rings connected by shear springs represented the sandwich panel. In this model, core shear deformation was assumed as the single significant contributor to the sandwich panel stiffness. The facesheet orthotropic was neglected in the panel response. Four different force histories: constant force, triangular force, sine series, and combination of sine and triangular force were used to calculate the energy loss in the panel. Of these, triangular and combined force gave results in better agreement with experimental results. 2.4Aluminium Honeycomb For design and construction of lightweight transportation systems such as satellites, aircraft, high-speed trains and fast ferries, structural weight saving is one of the major considerations. To meet this requirement, sandwich construction is frequently use instead of increasing material thickness. This type of construction consists of thin two facing layers separated by a core material. Potential materials for sandwich facings are aluminium alloys, high tensile steels, titanium, and composites depending on the specific mission requirement. Several types of core shapes and core material are been applied to the construction of sandwich structures. Among them, the honeycomb core that consists of very thin foils in the form of hexagonal cells perpendicular to the facings is the most popular. A sandwich construction provides excellent structural efficiency, i.e., with high ratio of strength to weight. Other advantages offered by sandwich construction are elimination of welding, superior insulating qualities and design versatility. Even if the concept of sandwich construction is not very new, it has primarily been adopt for non-strength part of structures in the last decade. This is because there are a variety of problem areas to be overcome when the sandwich construction is applied to design of dynamically loaded structures. Other investigators have previously carried out noteworthy theoretical and experimental studies on linear elastic and nonlinear behavior of aluminium sandwich panels. Kelsey et al., 1985 derived simple theoretical expressions of the shear modulus of honeycomb sandwich cores. Witherell, 1977 performed an extensive theoretical study for structural design of an air cushion vehicle hull structure using aluminium honeycomb sandwich panels. Okuto et al., 1991 showed the validity of the so-called equivalent plate thickness method in which a honeycomb sandwich panel subjected to inplane loads is approximately replaced by a single skin panel with equivalent plate thickness. Kobayashi et al., 1994, studied Elasto plastic bending behavior of sandwich panels. An experimental study was undertaken by Yeh et al., 1991 to investigate the buckling strength characteristics of aluminium honeycomb sandwich panels in axial compression. Kunimo et al., 1989 both, have studied the characteristics of the energy absorption capacity of bare honeycomb cores under lateral crushing loads theoretically and experimentally. 2.5 Ballistic Limit The ballistic limit may also be defined as the maximum velocity at which a particular projectile is expected to consistently fail to penetrate armor of given thickness and physical properties at a specified angle of obliquity. Because of the expense of firing tests and the impossibility of controlling striking velocity precisely, plus the existence of a zone of mixed results in which a projectile may completely penetrate or only partially penetrate under apparently identical conditions, statistical approaches are necessary, based upon limited firings. Certain approaches lead to approximation of the V50 Point, that is, the velocity at which complete penetration and incomplete penetration are equally likely to occur. Other methods attempt to approximate the V0 Point, that is, the maximum velocity at which no complete penetration will occur 2.6 Energy Absorption Mechanism of Composite Materials The research was done by Naik and Shrirao at 2004. Impact loads can be categorized into three categories which is low-velocity impact, high-velocity impact and hyper-velocity impact. This classification is made because of change in projectiles velocity will result in different mechanisms in terms of energy transfer between projectile and target, energy dissipation and damage propagation mechanism. Basically, ballistic impact is considered as low-mass high velocity impact. In this impact event, a low-mass projectile is launched by source into target at high velocity. It is unlike low-velocity impact that involved high-mass impactor impacting a target at low velocity. In view of the fact that ballistic impact is high velocity event, the effect is localized and near to impact location. According to Naik et al. (2006), seven possible energy absorbing mechanisms occur at the target during ballistic impact. Those mechanisms are cone formation at the back face of the target, deformation of secondary yarns, tension in primary yarns/fibres, delamination, matrix cracking, shear plugging and friction between the projectile and the target. Then, the researchers formulated all these energies into equation whereby the total energy absorbed by the target is summation of kinetic energy of moving cone EKE, shear plugging ESP, deformation of secondary yarns ED, tensile failure of primary yarns ETF, delamination EDL, matrix cracking EMC and friction energy EF. ETOTALi = EKEi + ESPi + EDi + ETFi + EDLi + EMCi + EFi Mines et al. (1999) identified three modes of energy absorption when analysed the ballistic perforation of composites with different shape of projectile. These energy absorptions are local perforation, delamination and friction between the missile and the target. However, the contribution of friction between the missile and the target in energy absorption is low compared to the other two. In terms of local perforation, three through-thickness regimes can be identified, namely: I shear failure, II tensile failure and III tensile failure and delamination. Out of these three regimes, the through-thickness perforation failure is dominated by shear failure. Similar observation has been made by other researcher for thick graphite epoxy laminates whereby the perforation failure is dominated by shear failure. The third main energy absorption mechanism is delamination. Delamination can propagate under Mode I (tensile) and Mode II (shear) loading and each mode can dominate each other depen ding on structural configuration of the composite as well as material properties. Therefore, it can be predicted that the total perforation energy is a summation of energy absorption due to local perforation, delamination and friction between the missile and the target. Epred = Ef + Esh + Edl where Ef = friction between the missile and the target; Esh = local perforation; Edl = delamination Apart from that, Morye et al. (2000) has studied energy absorption mechanism in thermoplastic fibre reinforced composites through experimental and analytical prediction. They considered three mechanisms that involved in absorbing energy by composite materials upon ballistic impact. The three energy absorption mechanisms are tensile failure of primary yarns, elastic deformation of secondary yarns and the third mechanism is kinetic energy of cone formed at back face of composite materials. They concluded that kinetic energy of the moving cone had a dominant effect as energy absorption mechanism for composite materials. However, they neglected a delamination as one of the factor contributed to the failure of composite materials during ballistic impact. 2.7 Kinetic Energy Equation Kinetic energy (KE) attack is a penetration of the residual energy of a projectile. A projectile can give a certain amount of energy to attack and damage a vehicle if the projectile sufficient residual energy when it arrive at the target. This residual is very important to overmatch the capability and strength of the target material to resist penetration, and then it will penetrate. Kinetic energy shot can be presented with the simple law of physic. K.E = Mprojectile Vprojectile2 Increasing the mass (Mprojectile) of the shot increases its energy, but the real payoff comes from increasing its velocity (Vprojectile). If the diameter of the shot fills the whole gun barrel, the projectile becomes heavier and difficult to accelerate to required velocity with the length of the barrel. Additionally, a large diameter solid shot will provide more energy to penetrate the armour plate compared to a projectile which has the same mass but a smaller diameter. Consequently, the larger shot is not only less effective at the target but it is difficult to give it the necessary velocity. According to Chang et al., 1990, depth of penetration at the target will depend not only on residual energy, but also on shape and size of the projectile. The curve shape at the projectile head is more important, as it must not only able to pierce the armour but the shoulders of the shot must also support the remainder so that it does not break up on its way through the armour. If for given mass the diameter of the shot is reduced and is length increased, then for the same residual energy the shot will penetrate further, as it is working on a smaller cross section area of armour. The ratio of length-to-diameter is called slenderness ratio. Any projectile with ratio in excess of 7:1 cannot be spin stabilized it is not until they reach a ratio approximately 20:1 that they can call long rod. So, based on those discussions above, we can conclude that energy absorption can be performed by this relation Eabsor = Ein Eout = [ Mprojectile Vin2] [ Mprojectile Vout2] = Mprojectile (Vin2 Vout2) So, Eabsorbed = Mprojectile (Vin2 Vout2) 2.8 Tsai-Hill Failure Criterion Hill, 1950 proposed a yield criterion for orthotropic materials: G+H12+F+H22+F+G32-2H12-2G13-2F23+2L232+2M132+2N122=1 This orthotropic yield criterion will be used as an orthotropic strength or failure criterion in the spirit of both criteria being limits of linear elastic behavior. Thus, Hills yield stresses F, G, H, L, M and N will be regarded as failure strengths. Hills criterion is an extension of von Mises yield criterion. The von Mises criterion, in turn, can be related to the amount of energy that is used to distort the isotropic body rather than to change its volume. However, distortion cannot be separated from dilatation in orthotropic materials, so Equation 2.8 is not related to distortional energy. Unfortunately, some authors still mistakenly call the criterion of Tsai-Hill a distortional energy failure criterion. The failure strength parameters F, G, H, L, M and N were related to the usual failure strength X, Y, and S for a lamina by Tsai. If only 12 acts on the body, then, because its maximum value is S, 2N=1S2 Similarly, if only 1 acts on the body, then G+H=1X2 And if only 2 acts, then F+H=1Y2 If the strength in the 3-direction is denoted by Z and only 3 acts, then F+G=1Z2 Then, upon combination of Equations (2.10), (2.11) and (2.12), the following relations between F, G, H and X, Y, Z result: 2F=1Y2+1Z2-1X2 2G=1X2+1Z2-1Y2 2H=1X2+1Y2-1Z2 For plane stress in the 1-2 plane of a unidirectional lamina with fibers in the 1-direction, 3 = 13 = 23 = 0. However, from the cross sectional of such a lamina in Figure 2.3, Y = Z from the obvious geometrical symmetry of the material construction. Thus, Equation (2.8) leads to 12X2-12X2+22Y2+122S2=1 as the governing failure criterion in terms of the familiar lamina principal strengths X, Y, and S. And, the appropriate values of Xt or Xc and Yt or Yc must be used depending on the signs of 1, 2, 12 (except that the surface is symmetrical about the plane 12 = 0 because S has only one value). Finally, for the off-axis composite material example of Tsai-Hill failure criterion, substitution of the stress-transformation equations, 1=xcos2 2=xsin2 12=-xsincos In Equation (2.14) yields the Tsai-Hill failure criterion for uniaxial off-axis strength, cos4X2+1S2-1X2cos2sin2+sin4Y2=1X2 which is one criterion. Because a composite lamina usually has different strengths in tension and compression, the values of X and Y must take on the appropriate values depending on the quadrant of stress space consists of four different segments that are continuous in value but not in slope at the uniaxial strengths. The Tsai-Hill failure criterion appears to be much more applicable to failure prediction for this composite material than either the maximum stress criterion or the maximum strain failure criterion. Other less obvious advantages of the Tsai-Hill failure criterion are: The variation of strength with angle of lamina orientation is smooth rather than having cusps that are not seen in experimental results. The strength continuously decreases as grows from 0 rather than the rise in uniaxial strength that is characteristic of both the maximum stress and the maximum strain criteria. The maximum stress and strain criteria are incorrect by 100% at 30. Considerable interaction exists between the failure strengths X, Y, S in the Tsai-Hill failure criterion depends on whether the material being studied is ductile or brittle. Other composite materials might be better treated with the maximum stress or the maximum strain criteria or even some other criterion. 2.9 Finite Element Analysis This subheading starts with a brief introduction to AUTODYN and then follows this with an overview of the SPH implementation carried out. Aizawa et al., 1980 has conducted the research about the AUTODYN software. The AUTODYN software is widely used to simulate non-linear impact phenomena involving large strains and deformations, plasticity, fracture, and flow. The software, available on PCs to supercomputers, is packaged in an interactive, integrated environment wherein the pre- and post-processing and the analysis are contained in a single menu-driven architecture. The software encompasses a number of different numerical approaches for the analysis of impact problems. Within the software, Lagrange, Euler, ALE (Arbitrary Lagrange Euler), Shells, and SPH (Smooth Particle Hydrodynamics) numerical processors (solvers) are available. Impact processes ranging from equipment drop tests to the hypervelocity impact of space debris on a spacecraft can be modeled. Related study also been done by N.K.et al., 1987. The results of a number of analyses are present to highlight the advantages and disadvantages of each numerical technique for different classes of impact applications. It is shown that the selection of the appropriate numerical technique or combination of technique is critical to achieving both an accurate and computationally efficient solution. Impact case studies presented include: Hypervelocity impact of space debris on a shielded spacecraft Impact and penetration of ceramic armor by a steel projectile Oblique impact and ricochet of a steel sphere on RHA armor Impact and crush of a steel girder Explosive formation of an oil well perforator with subsequent impact and penetration on a layered steel/concrete structure The solutions illustrate the use of different numerical techniques with emphasis on efficiency and accuracy. Validation of results with available experimental data is shown. Animations of the numerically simulated impact phenomena can be shown directly from the AUTODYN software. CHAPTER 3 SIMULATION METHODOLOGY This chapter provides the detailed description of method of approach used in carrying out the present study. This includes the strategies that have been design to serve guidelines throughout the process of the study and to assist in achieving the desired objectives. An outline of the methodology is first present in a flow chart to provide an overview of the whole process, followed by detailed discussion of the outline and elaboration of key procedures and techniques employed in the simulations. Flow of my methodology consists the methods that been took in order to accomplish the expected results. Figure 3.1 showed the complete flow of methodology for this research. First thing to do is to make some researches about the topic chosen. All information was gathered through readings from related journals and thesis did some diggings through numerous interviews to get a clear figure about this topic. Next step, study and learn about the simulation program that is going to be used in this research, ANSYS AUTODYN and based on previous researches from literature reviews paper and results, we try to validate whether ANSYS AUTODYN really reliable to be used to continue this research. Then, we simulate in ANSYS AUTODYN. The comparison and analysis were done to validate simulated results with response to actual damage specimen. 3.1Simulation Tools Used Finite element analysis was conduct on the sandwich structure using ANSYS 2-D/3-D finite element model was developed and appropriate material properties were given to each component. For both the cases, ANSYS AUTODYN 2-D/3-D NONLINEAR hydrocode was used. It is an explicit numerical analysis code, where the equations of mass, momentum and energy conservation coupled with materials descriptions are solved. Alternative numerical processors are available and can be selectively used to model different regions of a problem. The currently available processors include Lagrange, Euler, Euler FCT, ALE and SPH. 3.2 Simulation Justification Based on much discussion about which software that are available that could conduct the simulation on sandwich structure subjected to high velocity impact, finally the findings showed that ANSYS AUTODYN is the one that is going to be used to simulate the test. So, to prove that this software is capable to conduct the simulation, some comparison on result between Lagrange solver with SPH solver of ANSYS AUTODYN on one of the literature review topic, Cylinder impacting a rigid wall (Taylor Test) was done. The comparison was on the results for cylindrical shape impact behavior to see whether results simulated with Lagrange solver showed the more or less the same graph as simulate in SPH solver. Figure 3.2 (a) showed the experimental deformation of rigid wall. Whereas Figure 3.2 (b) and (c) represent the resulting final deformations and plastic strain contours for the two analyses. The results which are summarized in Table 3.1 show that both simulations show satisfactory comparison with experiment. The SPH solution compares almost exactly with the Lagrange result. Experimental Deformation Lagrange Simulation Result SPH Simulation Result Table 3.1 Comparison of experimental and numerical Taylor Test results Experiment Lagrange SPH Cylinder Length (mm) 23.13 to 23.59 23.30 23.35 Impact Diameter (mm) 16.70 to 17.04 16.78 16.80 This validation illustrates that the SPH implementation also works well for cylindrical symmetry. It proved that no special unphysical techniques are used to treat particles close to the axis, or indeed anywhere else in the problem. 3.3 Simulation Setup In the numerical simulations presented, the projectile is made of steel. The steel material properties are from the AUTODYN material library and are shown in Table 3.2. The size and geometry of the projectile vary with different problems. The projectile was considered rigid. Lagrange solver was applied to the projectile. The laminated composite material was model by Lagrange method. In order to account for contact/penetration behavior between the Lagrange projectile and the Lagrange laminate, the gap interaction logic of AUTODYN has been activated between the Lagrange cells. AUTODYN has a state of art contact logic wherein objects use a small gap to determine if interaction exists. This gap defines a detection zone that exists around each interacting cell face or node. If a node enters the detection zone it is repelled by a force that is a function of the intrusion depth. AUTODYN also features another special function impact/penetration interface to avoid excessive noise on the impact surfaces. This feature is activated in all the simulations presented. The Lagrange solver has been implemented in both 2D and 3D. However, AUTODYN-2D is used here for simplicity and ease of demonstration. The laminated composite specimens for the penetration experiment were rectangular. In the AUTODYN simulations, an equivalent rectangular laminate plate was modeled in 3D analysis. The size of the rectangular laminate is equivalent to the experiment laminate plate The detail flow of simulation is shown in Figure 3.3. 3.4 Description of Model Consider the composite sandwich panel and rigid projectile as shown in Figure 3.4. The dimension of projectile is 23.10 mm in length and had a hemispherical head with 5.56 mm diameter. The effective material properties used in AUTODYN simulations for this material are shown in Table 3.3. The equation of state of the laminate is linear with a bulk modulus of 15.0 GPa. The laminate is treated as a linear elastic material. The sandwich panel consists of thin orthotropic facesheets of thickness h = 3 mm and isotropic crushable polymeric aluminium core of thickness H = 27 mm. 3.5 Failure Theory For a composite laminate, the Tsai-Hill Failure criteria are applied. Then, for the projectile, it is consider as rigid body. 3.6 Geometry Consider the composite sandwich panel shown in Figure 3.4. The core of the sandwich panel and the rigid projectile were created using *Part. The reference node for the rigid projectile was defined at the bottom of the projectile. The mass of the projectile was assigned automatically by the software 3.7 Material Properties Table 3.2 Material properties of steel projectile Properties Value Reference Density (g/cm3) 7.9 Bulk Modulus (GPa) 200 Shear Modulus (GPa) 90 Yield Stress (MPa) 200 Ultimate Strain 0.4 Erosion Strain 3.0 Table 3.3 Material properties of carbon fiber Properties Value E1 (GPa) 68.5 E2 (GPa) 68.5 E3 (GPa) 9 G12 (GPa) 3.7 v12 0.11 Xt (MPa) 860 Xc (MPa) 795 Yt (MPa) 860 Yc (MPa) 795 St (MPa) 98 1 (kg/m3) 1430 f 0.02 c (MPa) 60 Table 3.4 Mechanical properties of aluminium honeycomb core (Boyer et al., 1991) Properties Value Density (kg/m3) 77 Young Modulus (MPa) 69000 Poissons Ratio 0.33 Shear Modulus (MPa) 25000 Shear Strength (MPa) 120 3.8 Analysis Type An ANSYS AUTODYN Dynamic Explicit type analysis was performed for a time period of 0.15 ms. Non-linear geometry was switched on. All the required outputs such as displacements, velocities and stresses were defined in this module. 3.9 Mesh In finite element analysis, it is preferred to create a mesh with the least number of elements to keep analysis time reasonable while still getting accurate results. The facesheets and core were separate to get a very fine mesh towards the center of the sandwich structure. A biased ratio of 8.5 with 75 elements was defined in the first region of the panel and uniform mesh of 30 elements was defined in the second region. The facesheets had 2 elements through the thickness and the core had 25 elements. Both facesheets and core had default hourglass control and default distortion control. 3.10 Contact, Boundary Conditions The fixed boundary condition (transverse and radial velocity equal to zero) is applied on the outer boundary of the laminate. The velocity of the projectile is V0 = 287 m/s. 3.11 Simulation Analysis This simulation was performed using the Lagrange processor with erosion. Another approach available within AUTODYN is the SPH (Smooth Particle Hydrodynamics) solver wherein a gridless Lagrangian technique is used. Figure 3.9 are shown about the running-in-progress in simulation. Another figure of the simulation progress are shown at Appendix B CHAPTER 4 RESULT AND DISCUSSION 4.1Introduction This chapter is the one that showed all the actual experiment results that previous done and simulated results using ANSYS AUTODYN. The simulations that have been do by using Lagrange method. Comparison was done between the results and actual experiment result to see whether simulation results agreed well with the actual penetration done by Wan Awiss experiment. Data for penetration test were presented afterwards. 4.2Actual Penetration/Firing Test Results These are the data sheets of actual test handle by Wan Awis at 600m closed shooting range at STRIDE. Table 4.1 presents a Summary Penetration Test for Round 5.56mm Steel Core, the profile of specimen used and basic criteria for 5.56mm bullet for this penetration test. Results from this lot size of 5.56 mm bullets are shown in Table 4.2. This data will be compared with the simulated results. Table 4.1 Actual firing condition BALLISTIC IMPACT TEST Sample Hard Panel Test weapon 5.56 mm, 9 mm Test Gun Sample Type Sandwich Panel Shooting Distance 10m (honeycomb) and 5m (carbon fiber) Sample Size (mm) 100 x 100 x 3.3 Temperature 29.3C 31C Ammunition Calibre 5.56 45 mm Rel. Humidity 88% -93% Type of Projectile: FMJ (M855) Steel Core Shooting Angle: 0 obliquity Table 4.2 Test result on composite sandwich structure with 5.56 mm Caliber Range Type of specimen Depth of Penetration Entry diameter Exit diameter Entry Velocity Exit Velocity m mm mm mm m/s m/s 5.56mm 20 Composite 33.1 5.5 6.8 287 220.67 4.3 Simulation Results by ANSYS AUTODYN The simulation results were compared with the experimental ones to validate the finite element model. The variables selected to validate the numerical model were the residual velocity, the ballistic limit, and the contact time. The disadvantage of the experimental impact tests is the limited information concerning the development of the projectile during the impact. The experimental tests provided information only about the velocity of the projectile before the impact over the front skin and after the perforation of the back skin. However, the finite element model showed the progression of the projectile while it was crossing through the sandwich plate. Fig. 4.6 shows the progression of the projectile velocity during the impact (Vimp = 287 m/s). There are some pictures to show the results for this observation on penetration effect on specimen using ANSYS AUTODYN. The pictures was attached at the Appendix B. Simulation impact observations were done on projectiles back view, projectiles front view, and projectiles side view. The simulated results produced by ANSYS AUTODYN were done regarding difference parameters and values against time. The simulated results were presented in form of graph related to parameters specified. 4.3.1Residual Velocity The progress of the velocity shown in Figure 4.6 is representative of each impact. Plotted graphs were extracted from the same node in this simulated analysis. There are three different trends corresponding to the three components of the sandwich (front skin, core, and back skin). In the first region, the composite front skin caused a sudden drop in velocity at the beginning of the impact event, so that the projectile reached the honeycomb core at a velocity of nearly 250 m/s. Secondly, the velocity remained almost constant as the projectile went through the honeycomb core, when the projectile reached the back skin, its velocity was nearly 240 m/s. In the back skin, a new drop in velocity was observed for a residual velocity of over 210 m/s. 4.3.2 Energy Absorbed The projectile lost 46% of its impact kinetic energy, front and back skins absorbed 46% and 41% of the absorbed energy, respectively, and the honeycomb core absorbed 13%. This analysis was made on each numerical test, calculating the energy absorbed by the three components of the sandwich plate. Figure 4.8 specified the relation of absorbed energy against impact velocity. The skins were the main factor responsible for the energy absorption, while the energy absorbed by the honeycomb core was lower. The percentage of the energy absorbed by each component was almost constant for impact velocities higher than 250 m/s: the front skin absorbed 45%, back skin 40%, and core 15% of the absorbed energy by the composite panel (refer Figure 4.7). However, when the impact velocity was near the ballistic limit, the front skin absorbed most of the impact energy so that the projectile reached the back skin at a low-velocity. Thus, the energy absorbed by the back skin was reduced. The energy needed to break high strength carbon-fibres is very high, so the projectile underwent a sudden lost of kinetic energy when it penetrated a composite skin. The main energy-absorption mechanism of the honeycomb core was the plastic strain of the aluminium walls. The experimental tests indicated that the region of the honeycomb over which the projectile impacted had no influence on the results. The energy needed to deform a thin-walled cell of aluminium is very low, so the projectile crossed the honeycomb core with no major loss of kinetic energy. 4.3.3 Depth of Penetration Figure 4.9 shown the graph of displacement against time. The displacement (depth of penetration) is on specimens element that experienced the contact with 5.56 bullet projectile. Relation between those parameters was clearly explained by the above graph (refer Figure 4.9). The depth of penetration is increased by the time of penetration. The maximum displacement is about 3.3 cm which is equivalent to specimens thickness. 4.3.4 Contact Time Another analysis was done to see relation about contact time against the impact velocity (refer Figure 4.10). The contact time was determined as the time between the contact of the projectile with the front skin and the immediate at which the projectile fully penetrated the sandwich plate. 4.4 Velocity (mm/s) Against Time (s) Analysis The value of energy absorb during penetration can be calculated by using this formula Eabsorbed=12MprojectileVin2-Vout2 So, the value for impact velocity for simulated penetration test is 287m/s and value for after impact velocity is around 210 m/s (Figure 4.6) Eabsorbed=120.001782872-2102=34.06J The calculated value of energy absorbed during penetration for the front skin is equivalent with the value in the graph shown. (Figure 4.8) 4.5 Ballistic Limit The ballistic limit was defined as the minimum impact velocity required for the projectile to completely penetrate the sandwich plate. From the model, the ballistic limit calculated was 147 m/s. The experimental ballistic limit estimated was 139 4.2 m/s, by fitting the equation of Lambert et al., 1976 to the residual velocity versus impact velocity curve. A comparison of the results from the numerical model and the experimental test gave a difference of 6% in the ballistic limit. 4.6 Discussions The analysis done were clearly told us some methodology used on findings all required results about penetration test for 5.56 mm bullet projectile to the composite sandwich structure with honeycomb core. The value for each method that was performed based on equation involving simulated result. Table 4.3 contains the comparison between actual and simulation analysis (FEA) regarding the value of residual velocity, and amount of energy absorbed. This table could be highlighted as the final results for this final year degree project on topic Modeling of Sandwich Structure with Honeycomb Core Subjected to High Velocity Impact. Table 4.3 Table of results Data Source Impact velocity (m/s) Residual velocity (m/s) Energy Absorb (J) Actual test 287 220.67 34.06 Simulation Result 287 210 34.58 Percentage of error between results can be calculated using normal method used in many analyses. This percentage error value is very important in order to prove that the simulation software suggested for FEA in this research is reliable to conduct further study on this research in the future. A large difference of error indicates that the simulation doesnt meet it purpose and objective for this research. Error = [(findings actual) / actual] 100% So, based on this formula we can calculate percentage of errors (Eq 4.3) Simulation Results (Residual Velocity) Error = [(210 220.67)] / 220.67 100% = 4.84% Simulation Results (Energy Absorbed) Error = [(34.58- 34.06)] / 34.06 100% = 1.53% The percentage errors calculated were presented in Table 4.4. As we can clearly see, the percentage of error is in an acceptable range. The objectives for this research are relevant and proven scientifically using finite element analysis and engineering methods. Table 4.4 Percentage errors compare to actual penetration test Task Simulation Result (Residual Velocity) Simulation Result (Energy Absorbed) Percentage Error Between Actual Test and Simulation Analysis (%) 4.84 1.53 CHAPTER 5 CONCLUSIONS AND RECOMMENDATIONS 5.1 Conclusions In this study the perforation of composite sandwich panels subjected to high-velocity impact was analyzed using a three dimensional finite element model implemented in ANSYS AUTODYN. Experimental impact tests were carried out to validate the numerical model. Good agreement was found between numerical and experimental results; in particular, the numerical simulation was able to predict the energy absorption of the sandwich panel with a difference of 1.53% and the residual velocity of the sandwich panel with a different of 4.84%. The influence of both skins and the core in the energy-absorption capabilities of the sandwich panel was studied in a wide range of impact velocities. Most of the impact energy was absorbed by the skins. For impact velocities above 600 m/s, approximately 45% of the impact energy was absorbed by the front skin and 40% by the back skin. For impact velocities close to ballistic limit, the front skin absorbed almost the 60% of the energy. On the opposite, the honeycomb core absorbed between 10 and 20% of the impact energy by plastic strain, at all the impact velocities analyzed. Also, the energy-absorption mechanisms in both skins and the core were studied. The main mechanism in the skins was fibre breakage whereas in the core the mechanism was the plastic deformation of the aluminium wall. Both in the skins and the core, the damage was concentrated in a small area around the impact point.

workplace diversity paper - 1115 Words

Benefits of Workplace Diversity In the 21st century, workplace diversity has enhanced organization performances and communication skills which benefited the organizations to become successful businesses. Increasing adaptability in the workplace, having to value diversity, and executing more effectively are three benefits of workplace diversity. Organizations most definitely have the ability to embrace their workplace diversity by helping their employees realize the benefits that enhances the business to become more competitive and successful. Unfortunately there are researchers that argue that workplace diversity can lead to problems in the business. Increasing adaptability is extremely beneficial for both management and employees for†¦show more content†¦Companies that hire collective educated and experienced employers tend to have a bigger opportunity of working more effectively, and those employers also tend to inspire the other employers to work their best. â€Å"The overall goal of diversity is not only to tolerate those who are different from us, but also to allow the differences of others to enrich our view of the world and to learn to work cooperatively with them†.(Robison Wood,2009) Figure 1,Is a picture with a lot of meanings of working together regards of the workplace diversity. Figure 1. Rebuttal The problem that most organizations are arguing is that diversity can also lead to misunderstanding, suspicion, and conflict which can result in low competitiveness and performance in the workplace. â€Å"However, the preponderance of the evidence favors a more pessimistic view: that diversity creates social decisions, which in turn create negative performance outcome for the group.†(Mannix, Neale, 2005) Sometimes not all companies are in the same situations when it comes to the diversity the workplace, and also not all the associates of management are leading their employees by not encouraging or giving them the trust they need. 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The Effects Of Video Game Violence On Human Aggression...

Throughout a number of recent studies, participants playing violent video games have consistently shown increases in their aggressive behavior, both during and after the gameplay. A study that linked violent video games to child aggression found that in every group they tested, â€Å"Children who were exposed to more video game violence did become more aggressive over time than their peers who had less exposure† (Harding 1). An increase in aggressive behavior after playing violent video games is quite common in most cases, although many gamers would argue that other factors, such as people’s emotions, cause this negative change in behavior. This reveals numerous questions surrounding the effects that video game violence might have on†¦show more content†¦Ã¢â‚¬Å"Participants in violent video game studies have been less cooperative than participants in non-violent video game studies (Sheese Graziano, 2005)† (Greitemeyer, Osswald 212). Short bursts of negat ive behavioral responses don’t really pose a major threat to the individual, and these short term behavioral changes are much less of an issue in contrast to the possible long term behavioral changes. Long term behavioral changes are nowhere near as prevalent as short term changes. â€Å"In the long run, moral beliefs and various concepts on life can be acquired (Huesmann,1988, 1997)† (Rowell 180). Negative long term effects can often be detrimental to the individual and society in general. The meta-analysis made by Anderson et al. (2010) confirms the concepts made in the hypothesis, and is the most successful study surrounding the effects of video game violence to date. Some would argue that people’s emotions have a much greater influence on the change in behavior while playing violent video games. 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Fact Sheet on Tourism in Tokyo Japan-Free-Samples for Students

Question: Discuss about the Fact Sheet on Tourism in Tokyo Japan. Answer: Fact Sheet Tokyo Japan is the most recognized tourist centers in the world. It is due to the fact that the center has various tourist attractions sites, modern hotels and a conducive environment for touring activities (Watkins, 2010, p. 6). Tokyo Japan attracts most tourists who visit Japan in every summer of the year. The high number of tourist activities in Tokyo Japan contributes to the growth of Japans economy. Number of international visitors Basing on various reports, the estimated number of international Japan travelers in 2018 January was 2.5 million (2,501,500), this proves an increase of over 9% from the previous years. More than 80% of the tourists are from Asia. In 2016, the number of foreigners visits in Japan amounted to 24.03 million which exited the target they had of 20 million. Key attraction sites Mount Fuji which is the most recognized landmark. It is the countrys highest mountain peak with over 3,776 meters over the other largely landscape tall enough to be seen from Tokyo, 100 kilometers away. It is the most considered iconic recognized by the UNESCO. The Imperial Palace surrounded by walls and moats with its beautiful 17th-century parks. Many fine views of the palace from the surrounding. Ginza District: Shop til the Drop. It is the busiest shopping centers in the Tokyo and commercial center for the country over centuries. It has the famous Kabuki-za Theater as well as Shimbashi Enbujo in which Azuma and-Odori dances and the performance of Bunraku are staged forming a basis for tourists. The Asakusa and the Senso-Ji Temple. It is the most famous shrine of the Tokyo city and stands at the long street of shops where masks, carvings, combs made of wood and ebony, kimonos, toys, fabrics and precious paper goods (Chon et al, 2000, p. 10). National Museum of nature and science. The Ueno Park is a superb national museum of nature and science popularly known to be Kagaku Hakubutsukan). Ueno Park and Zoo is another site which looks like a paradise like an oasis of green in the heart of the busy city of Tokyo and it is the most tourist attraction site. It also has a zoo, aquarium, and variety of temples and museums to explore. Tokyo national museum. The museum houses various artworks amounting to 100,000 important works of Japanese, Indian and Chinese art. National Museum of western art commonly called Kokuritsu Seiyo Bijutsukan that was built in 1959 by the famous Swiss architect. The Meiji Shrine dedicated to Emperor Meiji and his wife and remains the most important religious site in the land. It is surrounded by 175-acre evergreen forest that has over 120,000 species found across the whole Japan. The Miraikan and Edo-Tokyo Museum. It is the newest and impressive museum of Tokyo. Simply called the Miraikan. It offers leading fascinating insight of the countrys technology. Edo Tokyo museum also is worthy of visiting. The Tokyo Sky Tree. It is the countrys tallest structure attracting tourists from various regions of the globe. The National art center. It is also called, Kokuritsu Shin-Bijutsukan. It is housed in a remarkable curved glass building in Tokyo district with over 600 paintings. The Kabuki-Za Theatre. The theater performance is popular among the tourists and its drama and comedy are relatively easy to follow. It holds over 2,500 people when full. Accommodation option available The luxury hotels, for example, are available to the visitors at different charges that suit the tourists needs and affordability. Mandarin Oriental, Conrad Tokyo, and palace hotel Tokyo Mid-range hotels- These hotels suit tourists needs especially those who are not extremely rich and are unable to afford luxury hotels. Budget hotels- Budget hotels have accommodations menu given to the visitors before they book a flight to Tokyo. This helps the visitor to plan and budget for all relevant costs to be incurred in their trip to Japan. The above is an image of Tokyo Japan Tourist site. Tourists activities Sightseeing and shopping in Tokyo- The number of tourists visiting Tokyo is expected to increase. Increase in the number results to an increase in tourist activities such as shopping, hotels accommodations, and other activities. Day Trip to Mt. Fuji The economic impact of tourism on GDP in Japan In 2015 findings, the tourism industry on the GDP was 12.9 trillion JPY, in 2016 its estimated was 13.3 trillion JPY amounting to 3.7% increase. In 2026, the amount is expected to rise to 16.4 trillion JPY with an annual growth of 2.1%. The tourism industry is expected to boost Japan's overall economic growth and attract foreign investors to come and venture in the industry given its incredible viability in Tokyo. Indirect contributions to the GDP are forecasted at 39.4 trillion JPY in 2015, 40.8 trillion JPY in 2016 and to reach 48.5 trillion JPY in 2026 with an increment of 1.7% annually. Direct job creation is estimated to increase yearly by 1.3% thats 1,239,000 in 2015 to 1, 343,000 in 2016. Annual growth of 0.8% to 2026 is expected to be realized. With this growth, the tourism industry will directly contribute to Japans economic growth and hence open up opportunities for employment to the citizens (Japanese Tourism Bureau, 2009). Growth in employment rates in the country will help Tokyo to grow in terms of productivity in its various industries that are run in the city (Crick-Furman et al., 2000, p. 90). Also, the 1.3 percent growth in employment levels will mean that tourism sector recruits more employees than any other sector in the country, this will, in the end, lead to increased foreign investors attraction to the city since the number of employees required to serve them is sufficient and high-quality services are guaranteed to the visitors (Japanese Travel Bureau Foundation, 2005) Other destination areas Setoguchi- the inland sea region is the destination wonder trunk focused on. Hakuba; it is a mountain resort that is more than just a powder snow. Kiramashoto national park is renowned for its beautiful oceans. Shonai; It is a region where the mountain priests roam, the wine country of Koshu. Towada-Hachimantai; a model national park designated by the national government of Japan. The northern Kyushu pottery route which takes places like Arita Imara, Karatsu, and Hasami. Bibliography Chon, K. S., Inagaki, Tsutomu, Ohashi, Taiji (Eds.). 2000. Japanese Tourists: Socio-Economic, Marketing, and Psychological Analysis. Binghamton, NY: Haworth Press Crick-Furman, Deborah, Prentice, Richard. 2000. Modeling Tourists Multiple Values. Annals of Tourism Research, 27 (1): 69-92. Japanese Pilgrimage and Modern Japanese Travel Behaviors. New Zealand Journal of Asian Studies, 10 (2): 93-110. Japanese Tourism Bureau. 2009. JTB Report: All about Japanese Overseas Travellers. Tokyo: JTB Kaigai Ryok? Eigy?bu. Japanese Travel Bureau Foundation. 2005. JTB Report 2005: All about Japanese Travellers. Tokyo: JTB Corporation. Watkins, Leah. 2010 The Cross-Cultural Appropriateness of Survey-Based Value(s) Research: A Review of Methodological Issues and Suggestion of Alternative Methodology. International Marketing Review, 27 (6).

Sex and the Renaissance Essay Example Essay Example

Sex and the Renaissance Essay Example Paper Sex and the Renaissance Essay Introduction A Comparative Analysis of Love, Sex, and Emotion Upon Renaissance Literature It would be hard to find a period in human history where sex, women, and beauty were not a highly influential topic. Over countless centuries, women have influenced religious movements, wars, famine and poverty, the arts, and a plethora of other subjects; indeed, the appeal of sex seems to have had a hand in all things we know of today. This is certainly true of the Renaissance era, as well, where sexual relations was a strong enough bond to dictate marriage, and people often married out of political strife, and mated simply to continue their heritage. This attitude was captivated in the literature and art world, as well, with the modern man able to cite countless exemplifications of the imperativeness of the human body and sexual connotation to authors and artists’ works during the entirety of the Renaissance. Whether the topic was addressed with a serious tone, often accompanied by idolism and hyper bolized beauty, or written about with a humorous slant designed to entertain and enthrall the literate of the time, one cannot possibly respect the work of these great writers and scholars without also acknowledging the depth of effect womankind and sex had on their work. Sex and the Renaissance Essay Body Paragraphs It would not be exaggeration to state that sex was an infatuation with the minds of the Renaissance thinkers, not unlike any other period of time. Authors often wrote poems and stories that would entice young women into attraction, the fact that these men were able to write and read apparently not attractive in itself. Of particular note was poet John Donne, an Englishman from the end of the Renaissance period. In the midst of Donne’s life, he became a priest and was appointed to be a Dean of St. Paul’s cathedral; however, upon analysis of some of his poems, one could question the purity of his heart and mind, although revering his wit in the process. A perfect exemplification of this characteristic is his work, â€Å"The Flea†. This piece of work utilizes the church and its holy sacraments as well as the female body and virginity as target practice for wry humor and subliminal courtship, with literary devices flowering to help prove his ill-gotten point. If a re presentative for the horny, witty teenage boy were needed from the Renaissance, Donne hits a home run with his use of the flea as a metaphor for sexual relations, among other things. For instance, Donne claims that a flea biting his girlfriend, and himself, was a signal of their unity in the creature: â€Å"This flea is you and I, and this/Our marriage bed, and marriage temple is;† demonstrating that the flea was both the reason for their unity and a symbolic representation for marriage. Also, if the woman attempted killing the animal, she would be killing all three of them, and the holy sanctimony of marriage. Unfazed, she crushes the bug under her fingernail and remarks that she felt no pain in doing so; Donne quickly retorts that if she were able to smash the insect so easily, then surely sex wouldn’t be much more of a step to take. As all the boys who read this smirk and all the girls roll their eyes, it is important to note the importance of this poem: it proves t hat people always think alike, no matter what time period they are from. Donne was cleverly seducing his girlfriend, although to what success no one knows; likewise, men of all ages and time periods attempt such behavior. There is no justification of this behavior, nor is there any principle behind it; it is simply inherent in mankind’s behavior, and a versatile subject to utilize. John Skelton, similarly, treated the subject of sex, and particularly the treatment of women, in a fairly light-hearted way. Presenting the topic of sleeping around rather fluidly and without any sense of passion or emotion, Skelton wrote â€Å"Mannerly Margery Milk and Ale†. This poem reads in a very lyrical sense, with repeated lines, easy to follow rhyme scheme, and other such figures of a melodic writing. It also shares something in common with the stereotypical portrayal of males: that they care only for the woman’s body, and not for their feelings at all. A man may be a charmer, but he certainly is only after what he truly wants, it seems: â€Å"Walk forth your way, ye cost me naught; Now I have found that I have sought: The best cheap flesh that I ever bought. With a simple analysis, one can take this poem as a step farther from Donne’s, as the male has charmed the female into getting sexual pleasure and then, rather maliciously, told her off afterwards. A similar theme also persists here, where the woman is tricked into seduction; in this case, our gentleman was able to successfully manipulate his interest. This may be a common idea, in that women were easily tricked into relationship, or perhaps it was only utilized in writing from the time, due to what it entailed in real life. Essentially, a woman was worthless after she had lost her virginity, and that makes the male’s actions all the more unbecoming. However, this made it all the more enticing to write about, regardless of what the purpose was to the reader. Either way, both poets see med to construe one basic idea: that the males of the time period were conniving and manipulative, much as they are perceived in many regards today; likewise, they seem to target the male readership, with an all but serious tone, in which they belittle the issue at hand and celebrate what ability they have to have power over women. On the other end of the spectrum, writers often put females on a pedestal, treating them like they are almost other-worldly. This was clearly a different ideological stance than the previous writers, in which the female body and the concept of beauty were the focus of their work. It isn’t hard to find this kind of thought: Shakespeare wrote sonnets that epitomized the beauty of woman, and Sir Thomas Wyatt especially condoned this type of thinking in a myriad of short poems. A perfect exemplification of his ethereal portrayal of woman is found in his piece â€Å"Whoso List to Hunt†. In it, Wyatt compares a female to a goddess-like doe, one wh o is described with perverted glory if one were not to know It was of humankind, and not beastiality. The beauty of this doe was overwhelming; and, along its neck, bore the phrase â€Å"Let no one touch me.† Clearly, Wyatt had some extremely high personification here, and whoever was the subject of his writing, be it an individual or all of womankind, would be flattered. It echoes sentiment, and empathy for womankind, speaking directly of the beauty that is of their existence, let alone any other fact that would make a person beautiful. In fact, this is vague in most of his work: womankind is beautiful, according to him, for what lies superficially on the outside. Also, an important idea to note is Wyatt’s emphasis on love, and its power over humanity. While the earlier writers mentioned simply ignored the concept of love in a relationship altogether, specifically Donne, Wyatt embraces it and even fears what it can do to the mentality and his well-being. This is eviden t in â€Å"The Long Love that in My Thought Doth Harbor†, where love prevails as the foremost emotion in his mind, above reason, shame, reverence, and the like. It â€Å"Camps in his forehead†, and later on, when it is subjected, runs hiding away inside him. He emphasizes the power that women can have, too, all due to love: â€Å"Love does not kill and does not unchain me, he neither wishes me alive nor frees me from the tangle. I see without eyes, and I have no tongue and yet cry out; I wish to perish and I ask for help. equally displeasing to me are death and life. In this state am I, lady, on account of you. † (Wyatt, pg. 597{I used the modern translation due to the emphasis on love and more concise or obvious structure. }) While the text from this writing, â€Å"I Find no Peace†, may indicate that Wyatt had wandering eyes or love for another, it still depicts the magnificence of love upon the human mind and heart. One would imagine that, if they are n ot under the impression that Wyatt is perhaps a bit incessant and stalking, that his depiction of womanhood is quite admirable to females reading his works. On the topic of beauty and love, one specific piece is called to mind. In Castiglione’s The Courtier, the ideal courting method is detailed; however, in the final few sections, it complements the idea of the perfect lady, and tries to explain what beauty is. Written from the perspective of a court of individuals, all chiming in with their own opinion, things get a bit hectic; drastically different takes on beauty are found in the text, for example. In book four, we find a conversation developing about the â€Å"goodness† of beauty; some individuals believe that beauty can cause horrible things, such as â€Å"hatred, war, mortality, and destruction.†(Castiglione, pg. 49), defining the fact that beauty invokes far more than admiration and attraction in humanity. A perfect example, which is also listed in the t ext, is the story of Helen of Troy. On the contrary, the concept of beauty is emphasized to be that of a circle: a circle, where goodness is the center. And, obviously, if a circle cannot exist without a center, than beauty cannot exist without goodness. Of course, this leads to some blatantly ignorant lines, such as â€Å"Whereupon doth very seldom an ill soul dwell in a beautiful body†(Castiglione, pg. 650). Apparently, an individual cannot be evil if they are beautiful on the outside. In a modest opinion, one would probably conclude that the thoughts expressed in this work were the result of the rich not having to subject themselves to ugly people, simply put. They had their choice, and therefore theories followed on why their logic was logical. Similarly, and while it may seem odd to say so, the same sort of hollow comparative logic is applicable to human beings today. The phrase â€Å"don’t judge a book by its cover†, however cliche, is quite accurate yet i gnored in society today. Apparently, they hadn’t the conception of this sort of judgment in the Renaissance; this is echoed by both Wyatt’s emphasis on external beauty and the crude explanation presented in The Courtier. It would be a paltry task to find other sexual and emotional themes present in Renaissance literature. From Queen Elizabeth’s love of her country to Sir Phillip Sidney’s work of literal idolization, â€Å"Astrophil and Stella†, to John Webster’s effeminately empowering â€Å"The Duchess of Malfi†, countless examples prevailed through time, studied still as representations of the past ways of life. Perhaps it is most important to realize that, when analyzing the desires and emotions of the people centuries before us, they held the same exact ideals that we cherish today. Beauty was a crucial piece of life and love, just as love was an important emotion driven through the hearts of men and women alike. Sex, too, was a t hought alluring to males and females, and will continue to be a draw until mankind ceases to exist. Much like the works of literature created today, mankind always finds itself enraptured by the thought of the opposite sex, of beauty and profound emotion; so too, will it always be a focal point of the literary world. These few short words, ones representative of so much more than can be adequately said, truly are the focal point of literature; a true parallel to the persistent emotion held inside the writer, the reader, and the world. Works Cited 1. Various Authors. The Norton Anthology of English Literature. Steven Greenblatt. 8th Edition. N. p. : Norton, 2006. 2. John Donne. â€Å"The Flea. † Poems of John Donne Vol. 1. 2002 Jan. 1. 10/25/10.=http://www.luminarium.org/sevenlit/donne/flea.php data-wpel-link=external rel=nofollow>http://www. luminarium. org/sevenlit/donne/flea. phpgt;. We will write a custom essay sample on Sex and the Renaissance Essay Example specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on Sex and the Renaissance Essay Example specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on Sex and the Renaissance Essay Example specifically for you FOR ONLY $16.38 $13.9/page Hire Writer

Music Appreciation essays

Music Appreciation essays I have always been a person who has enjoyed life with music. Ive come across numerous people that have told me that they dont really listen to music, and every time I hear it I cant help but look at them funny. I cant imagine how much of a void these peoples lives must be if they dont even appreciate music. Since the dawn of time music has been referred to as an art form. Sultans and Kings had musicians, Countries use anthems to reflect their beliefs, and most of the people today use it to relate to how they feel or to help them cope with things in their lives. Music can define, inspire, separate, or make people come together. What if there was no Christmas music to listen to while opening your presents? What if the Happy Birthday song was never sung? We all enjoy music whether you realize it or not. The first CD I had my mom buy me was Aerosmiths Get a Grip. I used to play it over and over until I could practically recite songs in my sleep. The way the guitar and drums sounded together was like heaven to me. I always thought that they had to be geniuses to come up with this stuff, until I found out how much they loved drugs and alcohol. Then over the years as I liked more bands and read about them, I learned that all of them seemed to have substance abuse problems. So then I realized that it must not be the brains, but something else. When I got a little older and a little more angered with life as an early teenager, I began to really love the way Metalica sounded. I would put my stereo as loud as it could go and just sit there in my room reading the lyrics on the CD cover. Just listening to it in my room would let me forget about whatever was bothering me at the time, and showed me that I wasnt the only one around having issues in my life and just hearing someone else sing a bout it can really boost up your moral. Later on when my girlfriend at the time b ...

Ageing Experience And Psychological Well Being Social Work Essay

Ageing Experience And Psychological Well Being Social Work Essay There are two potential determinates that might influence quality of life and psychological well-being of elderly people. Firstly there are the objective factors that are income, health, status and age and intuitively, usually having more of these things means greater quality of life. However, in various research based on happiness of the elderly people, objective factors are less powerful than one might expect as Lyubomirsky et al; cited in the research article titled ‘Psychological Acceptance and quality Of Life in the Elderly,'(2007). The research suggested that objective factors account for about 8 to 15 % of the difference in happiness. So, †Do people get less happy as they get older?† and their well- being while ageing has been discussed by various researchers in order to define the concept of successful ageing but there is still a lack of consensus on what defines a successful ageing. The various researches on the relationship between old age and well-being have been at many times assessed through life satisfaction, happiness and morale. 2.2 Theories of ageing In attempting to explain the ageing process and moreover the elderly experience with family support in this particular study, the theories of ageing, which describes the ageing process and what it implies will be taken into account. 2.2.1 Activity theory, developed by Havighurst and associates in 1953, asserts that remaining active and engaged with society is primordial to satisfaction in old age. The theory asserts that positive relationships in the aged individual’s level of participation in social activity leads to life satisfaction as active aging equals successful aging. Activity can be physical or intellectual in nature so as to replace those interests and relationships that have been diminished or lost over time. This theory proposes that elderly people need to remain active in a variety of social spheres as for instance with family or friends because activity is pr eferable to inactivity as it facilitates well-being on multiple levels that is assuming that activity is vital to well-being. Activity theory proposes that social activity and involvement with others results in an increased ability to cope with aging, improved self-concept, and enhanced emotional adjustment to the aging process (Lee, 1985). 2.2.2 Disengagement theory was proposed by Cumming and Henry (1961). This theory states that ‘aging is an inevitable, mutual withdrawal or disengagement; resulting in decreased interaction between the ageing person and others in the social system he belongs to’ (Cumming and Henry, 1961, p.2). Disengagement theory thus assumes that social involvement decreases with aging and that successful ageing is best achieved through abandoning social roles and relationships and by the individual reducing both activities and involvement. Proponents of this theory maintain that this separation is desired by society and older adults, and serves as such to maintain social equilibrium. While high morale is evident at the completion of the process, the transition is characterized by low morale. However, this theory has been strongly criticized by researchers who found a lack of evidence from older people disengaging from their surroundings. Whereas older people social relationships change and that they possibly have fewer ties, it was found that these relationships were often deeper and more significant.