Data base analysis Essay Example | Topics and Well Written Essays - 2000 words

Data base analysis - Essay Example However, enabling the ordering of the netmask provides the most efficient results for client’s orders but this does not enhance the internal clients in resolving the external addresses. Using the NS1 as a forwarder severs enhances successful name resolution for the internal clients. In round robin disabling, this will prohibit any further load balancing and hence will not enable the internal clients in resolving the external host names. In this scenario the user are likely to suffer from many problems which may prevent them from obtaining IP addresses, these may include the expiry of the users IP address, the incorrect DHCP configuration, duplicate IP address on the same network and lack of DHCP server authorization. As a result of the introduction of the active directory in the network, this authorizes the DHCP server and the expiry of the users IP address stimulates the generation of a new IP address (Shapiro, 2008). This also prevents a computer from acquiring a new IP addr ess by itself and thus prevents the DHCP missing which prevents users on network subnets to acquire new IP addresses. However, duplicate IP address prevents the user from communicating in the network but does not prevent the generation of a new IP address from the server. ... es which are connected to the main network through a virtual private network which uses registered authentication information from the active directory in the network this prevent unauthorized entry in to the network and as well as providing cheap access in the main network. Employees of a company can enter into the network through the authorization given by the network administrators. This is through the registration of usernames and the generation of passwords by the active directory which gives each employee rights and limits to access the network resources. This can be used to control the access of network resources by different employees. The use of centralized backups in WAN makes the sharing of network resources easier and cheap, a more improved backup includes all the possible inclusion of all subnet LANs joined together to a central database for easier access of resources, this can be done through network sub netting. References Carvalho, L. (2012). Windows server 2012 Hyper -V cookbook. Birmingham: Packt Pub.. Shapiro, J. R. (2008). Windows server 2008 bible. Indianapolis, IN: Wiley ;. Tomsho, G. (2010). MCTS guide to Microsoft Windows Server 2008 Active Directory configuration: exam 70-640. Boston, MA: Course Technology/Cengage

Research Design DB Essay Example | Topics and Well Written Essays - 500 words

Research Design DB - Essay Example The said actions resulted to a vicious cycle of manipulating records to be able to present a continuous growth of the company (Fusaro, Miller, & James, 2002). Basically, the misrepresentation of the company records can be considered as an escalating problem that is a continuous threat to the company’s survival. The fraud has been kept for long due to the fact there is an existence of accounts in other countries that were able to hide the real losses of the company. In the absence of such accounts, the manipulation of the records cannot be possible. On the other hand though, although the said actions are carefully undertaken, the unconventional presentation of records continuously raised suspicion until the said company finally collapsed due to the lack of supporting assets (Fusaro, Miller, & James, 2002). The misuse of the data by Enron can be considered to benefit the reputation and the price of the stocks during the particular time. The company had been able to continuously lead the market although loses can be considered substantial. The said loses which are well hidden during that time had been the cause of the fall of the company. Every data that are related to finding out the crimes committed limits the operation of the company (Bazerman, 2006; Fusaro, Miller, & James, 2002). In relation the ethical implications of the Enron case, the fraud and deceit of the different parties that are involved can be considered as the main issue. Basically, any misrepresentation of data specifically in business organizations can be ethically questioned. The fact that the company lacks the real assets that amounts to the values represented in the records can be considered as the main basis of the bound failure of Enron. In addition, the ethical implications of such actions of the financial personnel can be considered of detrimental effects in any business

Formations And Techniques In Soccer Physical Education Essay

Formations And Techniques In Soccer Physical Education Essay Different type of formations may be used depending on the skill of the opposite team but also whether the team is playing more attacking or defending. A 4-2-4-1 formation is a soccer formation with only one striker upfront. The striker is the player located highest up the field, his main task is to score goals for the team. Before we could analysis the 2 players in the case, we would like to look at some of the tips to be a good striker. A good striker must be able: Kick the ball in the goal (good at striking). A striker who can score goals on a regular basis will become important to his team. As a striker, he needs to learn to score with all different parts of the body. Shot on Site (aiming). In today game, scoring opportunities are so rare as compared to last time, so when the striker has the chances to shot, dont wait. In addition, good strikers must constantly running (good agility and speed), trying to create spaces and taking risks. It only takes one. Many strikers will beat players and create space for themselves, but yet hesitate to shoot in front of goal. Figure 1 below shows the no of times both the player score a goal, saved with 2 hands and blocked. Preliminary analyses from Figure 1, revealed that player B tends to score more goals (13) than player A (8), since the coach are looking for a striker, the ability to saved with 2 hands and blocked are not so important as compared to the ability to score. Figure 2 shows the no of chances both player A and B missed by shooting the ball wide away from the goal post, shooting the ball too high in front of goal post and missed a goal even in front of the goal post. As observed, player A tends to have higher misses (12) than player B (2), in terms of shooting the ball wide. The different of shooting the ball too high is not too great among the 2 players. In summary, as compared to player A, player B is a key returning scorer, who averaged a healthy 13 goals in the last season. His expertises on attack puts extreme stress on opposing defenses. He is sharp on the goal, seldom placed the ball wide. However, he tends to have some misses when he is near the goal post. The final choice: Player B to be selected. Figure 1 Players able to score Figure 2 Players not able to score Part B What is periodization? Periodization is defined as a process to structure the training program into phases, where athletes will train progressively and with variety. In general, a standard periodization plan consists of macro cycle (2-4 months), meso cycle (2-6 weeks) and micro cycle (5-7 days) which last for at least 12 months. Tudo Bompa is the man who improved the training system invented by the USSR, the improved periodization system stressed the importance of having different training stress throughout the year rather than to maintain a constant training plan. Using this method, Tudo Bopma has produced 11 medalists in various Olympics including 2 gold medals and 2 World championships for: track and field and rowing (Wikipedia, 2010). The importance and relevance of periodization in sports Many times, athletes are no longer motivated to train because they realized that their sport performance have not improved, no matter how hard they train hard. Having periodization is the way to change the athletes training program at regular intervals so that the athletes can work harder. Periodization can be applied to many various sport ranging from cycling, marathon, rowing and it can be used it on both male and female. Periodization training, in particular includes 7 different major components, they are technical, strength, power, speed, anaerobic, aerobic and mental. A study conducted for 34 women at the Human Performance Laboratory at Ball State University has proved that a periodized strength-training program can give better results than a non-periodized program The women in the periodized group have gained more in lean muscle, greater reductions in body fat and more strength gains than the non-periodized group after 12 weeks (Marx, J.O, 2001). Factors that affect periodization Periodization plan can be affected by several factors, these includes training stress and non training stress. Athletes undergo training or competition too intensively will usually become fatigue after sometimes. Fatigue is one of the factors that affect the athletics sport performance; hence coaches developing the periodization plan must includes management of fatigue also. Athletes are human after all, they will get sick and injured sometimes, when athletes are sick they are no longer able to continue and follow the periodization plan. Other non training stresses are: Lack of financial support from family or association, Lack of motivation from the athletes themselves, Social environment like countries at war, unrest, Too much travelling that causes sickness among some athletes. Description of the success of the periodization plan The success of the periodization plan is when all the athletes are able to complete all the competition that the coaches have planned, with no injuries and sickness, they are able to achieve their peak sport performance and win medals for the countries, clubs etc. Training plan for Mark Figure 1 Macro Cycle for 12 months for Mark in 2010 2011 Observations in relation to the skills, motor abilities and types of training in a training plan for Mark. According to Dr Ivan Astori (Dr Ivan Astori, 2010), a full knee reconstruction surgery is a major operation. Patients like Mark will experience high degree of pain after the operation and pain medication will be needed for the first 1 to 3 days. He will be able to sit in a chair and walk with crutches within 1 to 5 days. Mark will then undergo rehabilitation and physiotherapy till he is able to straighten out, flex and bend his knee. Next, he will be able to swim after 2 weeks of the surgery. After 2 to 3 months, the patient will be walking, biking and golfing, although running and jumping are discouraged. A full recovery to full strength is expected to take up 6 months. A successful soccer player like Mark, he needs to rely on the precise coordination of stability, agility and power production, hence during the periodization cycle, needs such as proprioceptive and kinesthetic awareness components must be heavily trained so to put him back into competitive level. In addition, footwork drills are also important for him because of the numerous quick and rapid changes in direction and speed that occur during the match. With all these in mind, a periodization plan that includes different frequency, different intensity, time of training and type of training like aerobic, anaerobic, speed, power, strength, technique, tactics, will need to plan for him. Specific objectives on the various phases of training/cycles in his training plan. A typical English Premier League season will start in Aug and ends in May next year, hence the periodization plan has to start in Sep and end til Jul when the new season starts in Aug. The periodization plan for Mark were broken into different meso level like General Preparation, Specific Preparation, Pre Competition, Competition, Recovery cycles as shown in figure 1 and also the different volume and intensity level. First, in the general preparation cycle which last for 5 months, since Mark is still recovering from his knee surgery, all the training will be concentrating on building his overall strength, improve his mental skill and aerobic level, but the level of intensity and volume must be maintained at low level (e.g. range 1 to 2, as shown in figure 2). The types of training could include swimming, cycling, weight training and slow jogging. All the training will be increased progressively from 1st to the 5th month without the comprised of the players injury. Second, in the specific preparation cycle which last for the next 5 months, Marks training will be concentrating on Speed, Power and Mental skill, however as compared to the previous 5 months, the intensity and volume will have to slightly increase by 1 tick. The job of training speed in soccer can be very complex and it must be planned properly. Here are some of the attributes that will make a better player: Speeding quickly off the mark Accelerating quickly over 10-15 yards Good speed endurance Fast possession of the ball Fastness of feet or agility Able to change direction quickly The ability to execute skills quickly Fast in thinking (Sporting Excellence Ltd, 2010) The types of training are as follow: At the start of a training session, speed training like speed drills that completed over short distances with rests can be conducted, e.g. 6 X 25 meters each (500 meters total) with 2.5 minutes rest between each rep. Soccer players must have the ability to maintain high levels of speed, even when tired, speed endurance e.g. run a long distance 150 yards at full intensity (90% 100%) with full recovery 15 minutes between each repetition. The types of Power training for Mark are weight training that includes high intensity, high weights and fast moving reps. The weight training will accomplish two of the main goals for the players; they are injury prevention and improved performance. Third, in the pre-competition and competition cycle which last for 1 month and 8 months respectively, emphasis should be given to technique, tactical, mental skill and anaerobic training. Technical training should include improving the skill of kicking, dribbling, passing, shooting, throw in and heading. The 2 major components of soccer tactics are how to attack and defend. Tactical drills are executed in training sessions to develop an understanding of the tactics to be used in the next games against the weaknesses of the opposition team. The most popular type of anaerobic training for soccer players is interval training. This helps the soccer players to develop strength through short bursts of speed in a variety of actions such as stopping, turning, and directional changes. Lastly, in the recovery cycle which last for at least 1 month, there are several methods can be apply to the players such as complete rest, like taking a 1 week break without any soccer training, go for massage, there are some positive effects of massage, these include relief of muscle fatigue and reduction of excessive swelling. Relaxation techniques can also improve the players ability to focus. Also, go to see a doctor for any physical damages to the players body. Figure 2 Volume Vs Intensity for the Macro Cycle Tapering Tapering is defined as the practice of reducing exercise in the days just before an important competition, tapering is used in many endurance sports, such as the marathon, athletics and swimming. A significant period of tapering like a week or more is essential for optimal performance. During tapering, volume, intensity, load of the training should be reduce so that the players can achieve peak performance during the game. Specific intervention strategies to improve Marks movement skills and fitness. The following are some of the strategies help to improve Marks movement skill and fitness: To build up the strength and endurance of his leg muscles, in particular doing weight training for quadriceps and hamstrings. The type of weight training for quadriceps are squats (3 sets of 15 reps), lunges (3 sets of 15 reps), leg extension, leg lifts , leg press and for hamstrings are leg curls, leg dead lift, lunges. To improve his cardiovascular conditioning, Marks need to move his body with his large muscle groups over a sustained period of time. these exercise can be cycling, swimming, jogging, circuit weight training.

Personal Response to Robinson Crusoe, by Daniel Defoe Essay -- Robinso

Defoe's novel, Robinson Crusoe relates one man's spiritual journey in search of self and his goal of setting things right and making amends. Finding the self may take a lifetime. It took twenty-eight years on the island for Robinson Crusoe to discover more about himself, and, of course, he had to wait that number of years before he could make up for past mistakes. However, we do not have an ocean preventing us from making amends, and if only readers were to open themselves to this book, for all its clumsiness, flat style and Eurocentricity, it can, by illustrating one man's life, illuminate ours. To begin opening ourselves we must begin to identify with Crusoe. This is not as easy as it might seem. For one thing, in my case, he is a man, and I am a woman. He lived two hundred years ago so had very different values. He was white. I am not. It is, however, necessary to push these things aside and go to the text. Look especially at instances when Crusoe is not the most politically correct of heros- -when he seems most at odds with our thinking. Consider Crusoe's treatment of Friday. Friday has no name of his own, and he, the "savage," automatically becomes a servant. Here, Crusoe is condescending and racist. Yet, when I look at my own actions towards others, I have to admit that many times they fall short of being good or just. Let us be honest, don't we all shun or dislike those not like ourselves in color, age, social standing, or religion, at some time or other? One other important flaw--some might not call it a flaw at all--is Crusoe's bond of utility rather than bond of mutual respect that forms the basis of his friendships. Crusoe is a man that, early in the novel, is a friend when the other person c... ...eight years on a desert island. We learn that what really keeps us down is our human self absorption and that we have to rise above this terrible selfishness. We learn that finding the self is acknowledging our frailty and working, in spite of it, towards making our spiritual side strong. If I realize what is important in life, I know I have learnt from Crusoe's experiences and will never have to cry "Oh had there been but one .... "The one book that teaches all that books can teach" Rousseau "I shall pass through this world but once; any good thing therefore I can do, or any kindness I can show to any human being let me do it now, let me not defer it or neglect it, for I shall not pass this way again." Stephen Grellet Works Cited Defoe, Daniel. Robinson Crusoe. Ed. Thomas Keymer. Oxford: Oxford UP, 2008. Print. Oxford World's Classics.

Aggression and violent behaviour Essay

The media of video and computer games is a phenomenon, which has developed rapidly since its first incarnations of simple graphical games, to today’s 3D rendered worlds which players are able to inhabit and explore as they wish. The gaming culture which has followed plays an integral part in contemporary society not just for the youth market but also for many adults, as a gateway to escape their everyday lives and express themselves within a gaming environment. This is the new media format much like television and radio with their introduction into the mainstream, the need to study and explore the implications has attracted scholars, and business’s to explore this new media, attempting to understand its effects on contemporary society. The amount of money and time spent by consumers on these game platforms and software has pushed them to the front of the entertainment market place, with several multinational companies vying for market dominance within this expanding industry (Calvert 2002). The research into violent video games and post play aggression is one of the key study points for this media source. The idea of played aggression transferring into real world situations generates a moral panic within society, and so researches are keen to discover any links with play and real life aggression or to dispel the fears of the public which have been scare mongered by the mass media. Moral panics such as video nasties are similar to the notion of game panics, both are especially aimed at young children for whom society deems to be susceptible and vulnerable to impressions from the mass media, and in this essay’s case their exposure to violent video games. The key to the difference with the notion of game panics is the interactivity between the player and the game mechanics, the player is able to decide what happens within the game as long as its within the game boundaries, for violent games this includes the abundance of killing computer generated characters, and this is the concern of the parents and oppositions to the graphic games available. Recent events such as the school shootings in Columbine, America have led to increased magnification on the topic and therefore more studies are being conducted trying to theorise a link between play and post play. The main research within the gaming context on violence and aggression is aimed towards the effects playing these games has on children. Jeanne B Funk’s writing on children and violent video games highlights these concerns. She explores the notion that children are ‘high risk’ players, and after playing the video games they become desensitised to violence, and deviant behaviour within the society that they belong. Funk doesn’t place a total blame on the games however as she draws on research into pre existing problems within the Childs personality developed within the environment and social surrounding which the child has grown up in, stating that playing these games could lead to the increased development of these problems. Dave Grossman, a US military trainer on the realities of war has a much different perspective to the debate on video games and aggression. He states that the continued playing of the game conditions and trains the youthful player into a killing machine, perfectly honed to kill on sight without a thought for the consequences. He develops the argument of Acquired Violence Immune Deficiency Syndrome (AVIDS), liking the disorder to the virus Aids. ‘The disease doesn’t kill you but simple destroys your immune system’ (Grossman). Arguing that the use of violent video games simple desensitises players, trains them to kill (stimulus response) with no thought for the repercussions of their actions. These two studies outline two different ideas on the argument of video games and aggression, but neither conducted first hand testing of the hypothesis of post play aggression. A frequently cited paper that presents evidence supporting the claim that violence in video games leads to violence in real life is: Video Games and Aggressive Thoughts, Feelings, and Behaviour in the Laboratory and in Life by Craig A. Anderson, Karen E. Dill. The research draws up the hypothesis of General Affective Aggression Model (GAAM). The model included both existing research on human learning and expression and research into media violence effects. The study consisted of two separate tests, a real life test and a laboratory-based test on game players to analyse a link between game play and post play behaviour. Goldstein disputes the merits of laboratory tests on the basis that they are floored due to the subject not playing the game but merely doing as they are told, so the same feelings, and experiences are different to those when the subject is truly playing the game in the comfort of their own home, with individual aims to achieve. The findings of the Anderson and Dill study supported the GAAM model in that post play aggression was evident. This is one of the few studies which have been conducted with any credibility on the topic of game panics, yet the topic is still wide open due to the lack of empirical research for which solid conclusions on the links between play and post play can be drawn. Freedman states that the lack of experimental research is fundamental in not being able to draw a clear link. He states that the demand factor, where the subject believes he has to react in a certain way and the ability to measure post play aggression are two factors which have thus far underlined the research in to video games and violent behaviour. These problems could be rectified by the increased proportion of studies, of by the drawing up of a new study method designed specifically for the examination of video games and not one which has been used to monitor other forms of media and post exposure behaviour. The existing research available on the topic of post play aggression is extremely limited with few pieces able to be seen as complete and giving a total answer to the questions answered. The idea that competitiveness within a game is equally to blame, as violent content needs to be explored as the arousal experienced from winning or losing a competition such as a sports simulation can increase the adrenaline within the body causing an outburst of violence (Fienberg 2002). Similarly the link needs to be addressed that not everyone who plays violent games will go out and kill people and so the link between characteristics innate to the individual are to blame for more severe violent acts and the video games at the moment are being lined up as scapegoats for individuals actions and more research needs to be conducted on the subject. Bibliography 1. Anderson, D.A. & Dill, K . E. (2000) Video games and aggressive thoughts, feelings, and behaviour in the laboratory and in life [online]. Washington: APA Journals. Available from http://www. apa. org/journals/psp/psp784772. html [Accessed 20/10/03]. 2. Funk, J. B. (2001) Children and violent video games: Are there high-risk players? [Online]. Chicago: Playing by the rules conference. Available from  http://culturalpolicy.uchicago.edu/

Generality and Reality

To answer the aforementioned questions, the paper primarily employs a qualitative approach, although a degree of quantitative data will also be utilized. From a qualitative perspective, the paper will draw heavily on case studies and historical and contemporary examples in order to take a comparative approach in explaining and identifying the effect that refugees have on the nations that receive them. Particularly, the case study approach and the identification of the relevance to the current crisis in Lebanon and Jordan will allow for the exploration of why specific positive or negative effects may be magnified in some cases and not others. Solely focusing on discussions of this issue can cause the reader to be bogged down by generalities that, although often making intuitive sense, lack historical evidence. For example, those who might argue that an influx of refugees has a negative effect on host countries might say â€Å"refugees cause overcrowding in the host country.† While this explanation may be intuitive, it is also simplistic. I hope to examine past case studies and research in order to bridge the gap between generality and reality in order to qualitatively explain; if this is a valid point on the negative side of the argument the manner in which overcrowding manifests itself, how that affects the broader economy, whether that argument has relevance for the Lebanese case, and the potential implications for policy. These conceptual, qualitative explanations will also require a degree of quantitative backing as well. As the paper is discussing economic impact, quantitative metrics for example, GDP figures, money spent on infrastructure development, wage data, and employment data will be employed to give more clarity and evidence to conceptual claims. This quantitative component—although not at the level of sophistication of regression analysis and not primary data in nature—will be useful in both the historical and contemporary parts of the paperLiterature reviewThe modern world is one of constant change and upheaval. For many in the Global North, this change is characterized by dramatic advances in technology and progressive policy reforms. But for still many more, the story is a markedly different tale of survival. Today, the world is confronting its worst refugee crisis since World War II. Facing political turmoil, violence, and war, over 60 million people have fled their homes in search of safety and with hope for a better future (Graham 2015). As these refugees pour over the borders of Iraq and Syria, pile onto smuggling boats in Libya and Burma, and flee to neighboring lands from Yemen and Somalia, they have captured the world's attention. Currently, much of the popular and academic discourse has addressed the moral and humanitarian components of refugee crises. Accordingly, whether due to mounting international awareness and pressure or humanitarian compassion; many developed regions, such as the United States and the European Union, have boosted their capacity to receive refugees. The human rights element inherent to refugee crises is relatively more clear-cut. But a broader academic discussion has been developing around the following question: what are some of the economic effects; both positive and negative, of the sudden influx of refugees on host countries? These economic questions are particularly important to a country like Lebanon, where Syrian refugees now make up over 20 percent of the population (Richard, 2014). Before these effects can be analyzed, it is important to distinguish refugees from other types of migrants. The United Nations, via the 1951 Refugee Convention, defines a refugee as someone who â€Å"owing to a well-founded fear of being persecuted for reasons of race, religion, nationality, membership of a particular social group or political opinion, is outside the country of his nationality, and is unable to, or owing to such fear, is unwilling to avail himself of the protection of that country. The key point here is movement out of fear and necessity, rather than, say, economic opportunity. This definition has also been expanded by many to include violence and war, famine, and natural disaster. Scholars have further delineated the difference between refugees and migrants by looking at size of the group and nation of origin. In particular, refugees are noted for typically moving as a part of a larger group of people rather than as individuals; they also generally come from relatively less developed economies. With these definitions in mind, the paper now turns to examining the economic impact that refugees have on host countries. Positive economic impacts Refugees can often bring positive economic impacts to the countries that receive them. The existing literature discusses a number of ways in which this can occur, five of which are discussed below. First, provisions designed and implemented explicitly for refugees can often lead to broader utilization by the host country's population. Specifically, schools built explicitly for refugee children have served local students, who might not otherwise go to school at all as well. The presence of refugees ensures enrollment stability, thereby helping to keep the schools open and functioning for all children; this in turn encourages continued investment and can improve the educational infrastructure of the country and boost long-term economic productivity. Aside from educational institutions, governments and international aid organizations may, because of the crisis, often invest in other infrastructure developments; such as medical clinics, housing developments, and roads to access refugee camps that can be maintained and used for the population at large when the refugee crisis subsides. These temporary structures—originally built to support refugees—can persist beyond the crisis and bolster the host country's infrastructure and development prospects. In this sense, these short-term negative economic shocks that refugees provide to the system can give way to a longer-term positive economic outcome. Second, it is also important to consider the demographics of the refugees themselves.Many of the factors that drive refugee crises; especially war or terrorism, are relatively indiscriminate to class. Because of this, refugees can often come from skilled and educated backgrounds. ResultsMost studies of the effect of unskilled migration on the wages of unskilled workers find only small negative effects. The early literature on the subject typically concluded that a 1 percent increase in the immigrant share in the population causes no decline in wages or a decline of 0.1 percent. These area studies that attempted to exploit the variation in migration incidence across countries, or more typically across localities in Lebanon and Jordan. As is most clearly seen in developing countries receiving large numbers of refugees, such as Jordan, Lebanon and Turkey, the concentration of refugees in specific localities can â€Å"crowd out† public services such as schools and hospitals, or cause the transport infrastructure to become congested. In advanced countries, where the infrastructure is well developed and the refugee inflow is much smaller relative to the native populations, these effects can be observed in specific neighborhoods, typically in low-income areas.Mitigating these concentration effects while at the same time avoiding the temptation of encouraging refugees to settle in distant locations where it is difficult to find work and people do not want to stay poses a genuine challenge to policy-makers. At the same time, it is clear that unskilled migrants can reduce the price of many market services and also reduce the cost of many public services like unskilled migrants help cleaning streets An important benefit that natives; whether they are skilled or unskilled derive from unskilled refugees, and one that until recently was largely neglected, is that they help reduce the prices of non-traded goods and services that natives use intensively. Researchers have proved that the surge in immigration in the Jordan and Lebanon since 2011 may have reduced the prices of these services by about 10 percent. By contrast, as discussed further below, the arrival of refugees can put upward pressure on housing in localities where they are concentrated. This can make low-income housing less affordable even as it represents a net wealth gain for the native population that owns housing. Since many advanced countries, most notably in Europe, experience high and persistent unemployment over many years, even when growth is near or above long-term potential, the worry that increased immigration will simply make the structural or cyclical unemployment problem worse resonates widely. Consider an economy where collective bargaining predominates in some â€Å"rigid† sectors and where the labor market is very flexible in others. They find that migration can increase unemployment in the rigid sector, while having a relatively small negative effect on wages in the rigid sector, and reduce the wage in the flexible sector where unemployment remains low by definition. In the long run, these effects tend to dissipate as investment responds. Thus, the model that assumes perfect labor markets tends to overestimate the impact of migration on average wages and to underestimate the effect on unemployment; meta-analysis of studies examining the effect of immigration on unemployment in developed countries found out that in general, an increase in immigration by 1 percent of the population leads to an increase in unemployment of no more than 0.3 percent. In contrast, studies of the Lebanon and Jordan labor markets, which are among the most flexible, have found no significant effect of immigration on employment opportunities for native workers; including low-skilled native workers. They found that, among less-educated workers, those born in the two countries tend to have jobs in manufacturing or mining, while migrants tend to have jobs in personal services and agriculture, providing an explanation for why low-skilled migration has a limited impact on employment. In fact, the share of migrants among the less-educated is strongly correlated with the extent of Jordan born worker specialization in communication tasks. In states with a heavy concentration of less-educated migrants, Lebanon born workers have shifted toward more communication-intensive occupations. Those jobs pay higher wages than manual jobs, and so such a mechanism has stimulated the productivity of workers born in the two counties and generated new employment opportunities.

Cempoala - Totonac Capital and Ally of Hernan Cortes

Cempoala - Totonac Capital and Ally of Hernan Cortes Cempoala, also known as Zempoala or Cempolan, was the capital of the Totonacs, a pre-Columbian group that emigrated to the Gulf Coast of Mexico from the central Mexican highlands sometime before the Late Postclassic period. The name is a Nahuatl one, meaning twenty water or abundant water, a reference to the many rivers in the region. It was the first urban settlement encountered by the Spanish colonization forces in the early 16th century. The citys ruins lie near the mouth of the Actopan River about 8 kilometers (five miles) in from the Gulf of Mexico. When it was visited by Hernan Cortà ©s in 1519, the Spaniards found a huge population, estimated at between 80,000-120,000; it was the most populous city in the region.   Cempoala reached its fluorescence between the 12th and 16th century AD, after the previous capital El Tajin was abandoned after being invaded by Toltecan-Chichimecans. The City of Cempoala At its height during the late 15th century, Cempoalas population was organized into nine precincts. The urban core of Cempoala, which includes a monumental sector, covered a surface area of 12 hectares (~30 acres); housing for the citys population spread far beyond that. The urban center was laid out in the way common  to Totonac regional urban centers, with many circular temples dedicated to the wind god Ehecatl. There are 12 large, irregularly shaped walled compounds in the city center that contain the main public architecture, temples, shrines, palaces, and open plazas. The major compounds were composed of large temples bordered by platforms, which elevated the buildings above the flood level. The compound walls were not very high, serving as a symbolic function identifying the spaces which were not open to the public rather than for  defense purposes. Architecture at Cempoala Cempoalas central Mexican urban design and art reflect the norms of the central Mexican highlands, ideas which were reinforced by the late 15th-century Aztec dominance. Most of the architecture is built of river cobbles cemented together, and the buildings were roofed in perishable materials. Special structures such as temples, shrines, and elite residences had a masonry architecture built of cut stone. Important buildings include the Sun temple or Great Pyramid; the Quetzalcoatl temple; the Chimney Temple, which includes a series of semicircular pillars; the Temple of Charity (or Templo de las Caritas), named after the numerous stucco skulls that adorned its walls; the Cross Temple, and the El Pimiento compound, which has exterior walls decorated with skull representations. Many of the buildings have platforms with multiple stories of low height and vertical profile. Most are rectangular with broad stairways. Sanctuaries were dedicated with polychrome designs on a white background. Agriculture The city was surrounded by an extensive canal system and a series of aqueducts which provided water to the farm fields around the urban center as well as the residential areas. This extensive canal system allowed water distribution to fields, diverting water from main river channels. The canals were part of (or built onto) a large wetland irrigation system that is thought to have been built during the Middle Postclassic [AD 1200-1400] period. The system included an area of sloping field terraces, on which the city grew cotton, maize, and agave. Cempoala used their surplus crops to participate in the Mesoamerican trade system, and historic records report that when famine struck the Valley of Mexico between 1450-1454, the Aztecs were forced to barter their children to Cempoala for maize stores. The urban Totonacs at Cempoala and other Totonac cities used home gardens (calmil), backyard gardens which provided domestic groups at the family or clan level with vegetables, fruits, spices, medicines, and fibers. They also had private orchards of cacao or fruit trees. This dispersed agrosystem gave the residents flexibility and autonomy, and, after the Aztec Empire took hold, allowed the homeowners to pay tributes. Ethnobotanist Ana Lid del Angel-Perez argues that the home gardens may also  have acted as a laboratory, where people tested and validated new crops and methods of growing. Cempoala Under the Aztecs and Cortà ©s In 1458, the Aztecs under the rule of Motecuhzoma I invaded the region of the Gulf Coast. Cempoala, among other cities, was subjugated and became a tributary of the Aztec empire. Tributary items demanded by the Aztecs in payment included cotton, maize, chili, feathers, gems, textiles, Zempoala-Pachuca (green) obsidian, and many other products. Hundreds of Cempoalas inhabitants became slaves. When the Spanish conquest arrived in 1519 on the coast of the Gulf of Mexico, Cempoala was one of the first cities visited by Cortà ©s. The Totonac ruler, hoping to break away from Aztec domination, soon became allies of Cortà ©s and his army. Cempoala was also the theater of the 1520 Battle of Cempoala between Cortà ©s and the captain Pnfilo de Narvaez, for the leadership in the Mexican conquest, which Cortà ©s handily won. After the Spanish arrival, smallpox, yellow fever, and malaria spread throughout Central America. Veracruz was among the earliest regions affected, and the population of Cempoala sharply declined. Eventually, the city was abandoned and the survivors moved to Xalapa, another important city of Veracruz. Cempoala Archaeological Zone Cempoala was first explored archaeologically at the end of the 19th century by Mexican scholar Francisco del Paso y Troncoso. American archaeologist Jesse Fewkes documented the site with photographs in 1905, and the first extensive studies were conducted by Mexican archaeologist Josà © Garcà ­a Payà ³n between the 1930s and 1970s. Modern excavations at the site were conducted by the Mexican National Institute of Anthropology and History (INAH) between 1979-1981, and Cempoalas central core was recently mapped by photogrammetry (Mouget and Lucet 2014). The site is located on the eastern edge of the modern town of Cempoala, and it is open to visitors year-round. Sources Adams REW. 2005 [1977], Prehistoric Mesoamerica. Third Edition. Norman: University of Oklahoma PressBruggemann JK. 1991. Zempoala: El estudio de una ciudad prehispanica. Coleccion Cientifica vol 232 INAH Mexico. Brumfiel EM, Brown KL, Carrasco P, Chadwick R, Charlton TH, Dillehay TD, Gordon CL, Mason RD, Lewarch DE, Moholy-Nagy H, et al. 1980. Specialization, Market Exchange, and the Aztec State: A View From Huexotla [and Comments and Reply]. Current Anthropology 21(4):459-478.del Angel-Pà ©rez AL. 2013. Homegardens and the dynamics of Totonac domestic groups in Veracruz, Mexico. Anthropological Notebooks 19(3):5-22.Mouget A, and Lucet G. 2014. Photogrammetric archaeological survey with UAV. ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences II(5):251-258.Sluyter A, and Siemens AH. 1992. Vestiges of Prehispanic, Sloping-Field Terraces on the Piedmont of Central Veracruz, Mexico. Latin American Antiquity 3(2):148-160.Smith ME. 2013. The Aztecs. New Yo rk: Wiley-Blackwell. Wilkerson, SJK. 2001. Zempoala (Veracruz, Mexico) In: Evans ST, and Webster DL, editors. Archaeology of Ancient Mexico and Central America: An Encyclopedia. New York: Garland Publishing Inc. p 850-852. Edited and updated by K. Kris Hirst