4 Key Models in Urban Geography That Explain Land Use

Walk through most contemporary cities, and the mazes of concrete and steel can be some of the most intimidating and confusing places to visit. Buildings rise up dozens of stories from the street and spread for miles out of view. Despite how hectic cities and their surrounding areas can be, attempts at creating models of the way cities function have been made and analyzed to make our understanding of the urban environment richer. Concentric Zone Model One of the first models created for use by academics was the concentric zone model, developed in the 1920s by urban sociologist Ernest Burgess. What Burgess wanted to model was Chicagos spatial structure with regards to the usage of zones around the city. These zones radiated from Chicagos center, The Loop, and moved concentrically outward. In the example of Chicago, Burgess designated five different zones that had separate functions spatially. The first zone was The Loop, the second zone was the belt of factories that were directly outside of The Loop, the third zone included homes of laborers who worked in the factories, the fourth zone contained middle-class residences, and the fifth and final zone hugged the first four zones and contained the homes of the suburban upper class. Keep in mind that Burgess developed the zone during an industrial movement in America and these zones worked mainly for American cities at the time. Attempts at applying the model to European cities have failed, as many cities in Europe have their upper classes located centrally, whereas American cities have their upper classes mostly at the periphery. The five names for each zone in the concentric zone model are as follows: Central business district (CBD)Zone of transitionZone of independent workersZone of better residencesCommuters zone Hoyt Model Since the concentric zone model isnt applicable to many cities, some other academics attempted to further model the urban environment. One of these academics was Homer Hoyt, a land economist who was mostly interested in taking a look at rents within a city as a means of modeling the citys layout. The Hoyt model (also known as the sector model), which was developed in 1939, took into account the effect of transportation and communication on a citys growth. His thoughts were that rents could remain relatively consistent in certain slices of the model, from the downtown center all the way to the suburban fringe, giving the model a pie-like look. This model has been found to work especially well in British cities. Multiple-Nuclei Model A third well-known model is the multiple-nuclei model. This model was developed in 1945 by geographers Chauncy Harris and Edward Ullman to try and further describe a citys layout. Harris and Ullman made the argument that the citys downtown core (CBD) was losing its importance in relation to the rest of the city and should be seen less as the focal point of a city and instead as a nucleus within the metropolitan area. The automobile began to become increasingly important during this time, which made for greater movement of residents to the suburbs. Since this was taken into consideration, the multiple-nuclei model is a good fit for sprawling and expansive cities. The model itself contained nine differing sections that all had separate functions: Central business districtLight manufacturingLow-class residentialMiddle-class residentialUpper-class residentialHeavy manufacturingOutlying business districtResidential suburbIndustrial suburb These nuclei develop into independent areas because of their activities. For example, some economic activities that support one another (for instance, universities and bookstores) will create a nucleus. Other nuclei form because theyd be better off far from one another (e.g., airports and central business districts). Finally, other nuclei can develop from their economic specialization (think of shipping ports and railway centers). Urban-Realms Model As a means of improving upon the multiple nuclei model, geographer James E. Vance  Jr. proposed the urban-realms model in 1964. Using this model, Vance was able to look at San Franciscos urban ecology and summarize economic processes into a sturdy model. The model suggests that cities are made up of small realms, which are self-sufficient urban areas with independent focal points. The nature of these realms is examined through the lens of five criteria: The topological terrain of the area, including water barriers and mountainsThe size of the metropolis as a wholeThe amount and strength of the economic activity taking place within each of the realmsThe accessibility internally of each realm in regards to its major economic functionThe inter-accessibility across the individual suburban realms This model does a good job at explaining suburban growth and how certain functions that are normally found in the CBD can be moved to the suburbs (such as shopping malls, hospitals, schools, etc.). These functions diminish the importance of the CBD and instead create distant realms that accomplish approximately the same thing.

Essay on The Controversy of Animal Testing - 1172 Words

Imagine being forced to move away from your home and from your family with no say in the matter. You are moved to an unfamiliar environment where you aren’t able to choose how you live your life. You don’t get to decide when or what you will eat. You can’t choose what you will do with your time and who you will spend it with. You are confined into a small area and you are completely alone. These are the conditions that many animals are forced to live under. Animal testing is defined as the use of non-human animals in research and development projects (dictionary.com). All kinds of animals such as rabbits, dogs, mice, and guinea pigs are used to test the safety of food additives, industrial†¦show more content†¦After many animal tests, the animals are euthanized. Again, they are not able to give consent for this as would be required of a human. Other animals have to endure the rest of their life in captivity or injured. When testing levels of toxicity, these levels are established for an average full grown male who weighs 70 kg. These results do not account for the levels of toxicity in women, children or people who are more sensitive to drugs and toxins (http://www. elements .nb.ca/theme/toxics/emily/emily.htm). Most of the animal tests performed are not, in fact, for medical research. Animals are mainly used to test cosmetics and household products. Testing these products is not required by law in most countries, so it is the company’s choice to do so (http://cfhs.ca/ research/cosmetic_testing/). When testing animals, sometimes painkillers cannot be used as they could interfere with the testing, so animals may have to undergo a lot of pain. It is also hard to gauge the amount of pain an animal is feeling when testing drugs and chemicals. There are also some perceived advantages for animal testing. The testing of animals has led to many medical breakthroughs. 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So why are animals for harmful testing? Each year millions of animals such as mice, rats, rabbits, and primates suffer through excruciating amounts of physical and mental torture. In recent years, the use of these animals has been has been strictly criticized by numerous animal rights groups

A New Cyber Security Initiative For The Army Materiel Command

In 2003, I was recruited to set up and lead a new cyber security initiative for the Army Materiel Command (AMC), a 53 Billion dollar year logistics command that serves as the army version of amazon for the army’s current inventory of weapons, supplies and vehicles. AMC, at this time, had over a 100k workforce spread across 140 locations worldwide. During this timeframe, the Department of Defense was still trying to define Cyber Security and mature the process they had in place. DOD was a large target and AMC ranked high due to the research we performed for the Army and the DoD. The attacks came from all types of hackers ranging from, high school and college kids to state sponsored attacks using everything from off the shelf scripts to specialized tools designed to specifically break down our security systems. At this time my command had one of the worst records in the army for cyber security incidents. These attacks were, due to their ferocity and complexity, having a devast ating impact on our ability to support the war efforts in Iraq and some attacks resulted in exfiltration of sensitive but unclassified data. AMC, during this timeframe, owned 50% of the Army’s computing power and this took the form of workstations, servers, applications and communication circuits so the impact was significant. Coupled with these ongoing attacks, the Army changed the way security incidents were being reported, directing all incidents to be reported to the Chief Of Staff (COS) of theShow MoreRelatedSecurity Command Personal Statement Examples820 Words   |  4 Pagessuch disciplines as: information security, systems administration, developing internal and external web pages, software development, network services, storage services and IT work support for investigations and audits. This experienced is evidenced via assignment with the Army Materiel Command (2001 to 2010) (AMC) as Director of Enterprise Operations, Strategic Planning and Chief Technical Advisor and more recent in the position as the Chief Information Security Officer. My assignments at the USRead MoreOne Significant Change That Has Occurred in the World Between 1900 and 2005. Explain the Impact This Change Has Made on Our Lives and Why It Is an Important Change.163893 Words   |  656 PagesAutotown, U.S.A. Van Gosse and Richard Moser, eds., The World the Sixties Made: Politics and Culture in Recent America Joanne Meyerowitz, ed., History and September 11th John McMillian and Paul Buhle, eds., The New Left Revisited David M. Scobey, Empire City: The Making and Meaning of the New York City Landscape Gerda Lerner, Fireweed: A Political Autobiography Allida M. Black, ed., Modern American Queer History Eric Sandweiss, St. Louis: The Evolution of an American Urban Landscape Sam Wineburg

Cause and Effects essay free essay sample

There is no doubt that education is essential to peoples lives. Having a good educational background is an important factor to get a good job and to work effectively. However, one of the saddest issues in todays society is the college dropout rate in many college or university remains very high. Some people are successful because they have the motivation and determination to graduate college; others are less lucky because they start college and feel as if they lack the preparation, desire, discipline or ability to succeed academically or persevere until a degree has been earned. This leads to quite a situation–to find the support needed to continue or to dropout? Whether you’re realizing that college isn’t for you, family issues, laziness or even debt, understanding some of the common causes and effects of quitting college may aid in the decision. College is an investment. Students either pay for college themselves, possibly with family support or scholarships, or with financial aid. We will write a custom essay sample on Cause and Effects essay or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page Many students drop out of college because they can’t or don’t want to take on any more student loan debt. The consequence of dropping out at this point is that you have already piled up sizable debt and loan payments (students who drop out of college are required to pay back a portion of their federal-aid funds such as the Pell Grant) that you have to begin paying back several months after you quit school, yet you don’t get the payoff of a degree. Many financial aid administrators feel that the government shouldn’t penalize poor students for dropping out of college, and nor should lower-income students have to â€Å"punch a clock† in order to receive their grant money. Satisfying all the academic requirements and paying all your bills is both necessary and sufficient for being eligible to graduate. In addition to any debt you must repay, your earning potential without a degree is much lower to degree holders. Thus many college dropouts struggle to cover short-term bills and expenses, and find it difficult even to consider saving up money for a home. A college dropout earns about seven percent less than someone with an associate’s degree and about thirty-two percent less than someone with a bachelor’s. College dropouts face more limited career options than graduated peers. A bachelor’s degree commonly  opens the door to entry-level positions in many industries and career fields. As a dropout, your access to many jobs that require a college degree is limited to compete for jobs against people who hold degrees, even when a degree is not required. Job opportunities aren’t the only things that push people to college, sometimes it comes from a progenitor. Some students attend college under pressure from parents or to make their parents proud, not always making themselves happy in the process. In these cases the decision to drop out is not always warmly received. In fact, some students are told that they can’t return home after dropping out, which can only build on more stress. The expectation is that they will get a job and enter the â€Å"real world.† However, to get a job with good pay is hard to find without a degree, and most people don’t realize that. Another reason for dropping out of college is if there was a death in the family or someone you were close to falls ill. A death can cause depression which will eventually make you lose focus of your studies and you’ll end up either failing out, or dropping out. Dropping out can negatively affect relationships with significant others, as well. Recent studies show that divorce rates were significantly lower for college graduates than those without degrees. Having a great academic background can take you a long way, and you can learn how to work adequately in the future. To ensure a successful future, one must strive and have the incentive to succeed. Unfortunately certain things happen and some students have to drop out. It could be a personal choice, or it could be a sacrifice they have to make. In instances where it would be a choice, the students feel as if they’re working towards a dead end and have the lack of motivation. Knowing the reasons and the consequences can help others understand the decision that was made.