Urban Areas Modify Climates Essay Example for Free

Urban Areas Modify Climates Essay Urban areas climate is often significantly different to the surrounding rural areas, this is why urban areas are often described as having their own â€Å"micro climate† the differences in urban climates are due to number of different factors. Urban areas often experience a phenomenon known as a heat island, this is a zone of hot air around and above an urban area which has higher temperatures than the surrounding rural areas consequently cities tend to be warmer than rural areas and the temperature becomes lower progressively as you move towards the rural area with the highest temperatures being in the city centre. Heat islands form due to a variety of factors which are present within cities and not commonly found in rural areas, firstly building material such as concrete and tarmac absorb large quantities of heat during the day (due to their black colour) and when temperatures are cooler (nigh time) the heat is released gradually warming up the surrounding area, this is why the effects of the heat island are more visible at night time because the city remains warm whilst the rural areas are much cooler. There are a large amount of buildings with glass windows within the urban areas, these have a high reflective capacity and reflect heat towards the streets were it is absorbed. Another factor influencing towards to the heat island formation is the heat energy being emitted from industry due to the combustion of fossil fuel which releases heat, domestic heating also contributes towards this, this heat energy warms up the air within the urban area contributing to the dome of warm air which is the heat island. The emission of hygroscopic pollutants from cars also acts as a condensation nuclei leading to the formation of cloud and smog which traps radiation within the area. Precipitation rates are also significantly different within rural areas, research shows that rainfall is generally higher within the city than surrounding rural areas, a reason for this could is due to the fact the heat island ultimately means temperatures are higher therefore lower pressures will be encouraged to dev elop above the city, also it means Evapotranspiration rates will be higher within the city causing more cloud formation. Convection rainfall is much higher within the city and this is because the heat island enhances convectional uplift, the city also produces large amounts of water vapour from industrial sources this also means that humidity levels within cities are usually higher The occurrence of Fog is dramatically higher within urban areas, the great increase in the amount of fog within cities is in accordance with the industrialisation of the city, e.g. In London 1700 there was 29 days of fog but by the 1800 (industrial revolution had occurred) there was over 50 days of fog, this statistic shows that the amount of fog is influenced by the amount of industrial activity within a city. The reason behind this is the fact that cities have a higher average number of particles within the air (due to industrial activity releasing pollution) these particles act as a condensation nuclei and encourage fog formation (usually under high pressure conditions) when pollutants become trapped within the lower atmo sphere water vapour can condense around these particles and cause smog to form. These were common in 20th century London. Smog can have devastating effects and can cause serious respiration problems for people and trigger diseases such as emphysema, more recently photochemical smog has been developing this is due to polluting gases such as nitrous oxides and carbon monoxide react with sunlight to produce a cocktail of harmful gases which can cause devastating health effects. Air quality within urban areas is also dramatically different than surrounding areas. Within cities there is a significant amount of pollution, there are different types of pollution and they have different effects. Suspended particulate matter is solid matter within the urban atmosphere such particles are usually less than 25micrometers in size and cause problems such as fog/smog, respiratory diseases, soiling of buildings. Sulphur dioxide is usually released from combustion of fossil fuels causes a hazard known as acid rain (due to its acidic nature) and this can corrode away at buildings it also contributes to respiratory disease s Carbon monoxide is also released from incomplete combustion of fossil fuels and is a poisonous gas that prohibits haemoglobin within the blood to uptake oxygen, therefore it is potentially life threatening. Consequently due to all the pollutants the number of â€Å"blue sky days† were the sky is visibly blue can be significantly reduced consequently reducing the amount of sunlight upon the city, there have been policies introduced in cities worldwide to reduce pollution levels and increase the number of blue sky days. The serious effects of poor air quality can be perfectly illustrated with Beijing were the public wear masks to protect themselves from the poor air and serious efforts have been made to cut down on polluting sources. The urban layout of buildings of various different sizes vastly affects the wind pattern in the upper atmosphere; there are effects on wind speed, direction and frequency. The surface area of cities which is very uneven exerts a powerful frictional drag on the air moving over and around this creates strong turbulence giving rapid and abrupt changes in both wind direction and speed, consequently average wind speeds are lower within the city. High rise building significantly disturb airflows over urban areas, they deflect and slow down the upper atmosphere winds, and this can creature strong vortices and eddies. These fast turbulent winds can become funnelled in-between buildings producing a venturi effect this can swirl up litter and make walking down pavements difficult In conclusion urban areas can significantly influence their climate and cause it to be very different compared to surrounding rural areas, urban areas cause numerous amounts of changes in the climate surrounding them and cause higher temperatures, higher precipitation rates, effect the air quality and completely disturb the upper atmosphere wind pattern.

Comparing the Character of Life in As You Like It and King Lear :: comparison compare contrast essays

The Character of Life in As You Like It and King Lear      Ã‚  Ã‚  Ã‚   Through comedy and tragedy Shakespeare reveals the vast expanses and profound depths of the character of life. For him they are not separate worlds of drama and romance, but poles of a continuum. The distinction between tragedy and comedy is called in question when we turn to Shakespeare. Though the characters differ in stature and power, and the events vary in weight and significance, the movements of life in all Shakespeare's plays are governed by the same universal principles which move events in our own lives. Through myriad images Shakespeare portrays not only the character of man and society but the character of life itself.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   The difference between comedy and tragedy, success and failure, good fortune and catastrophe often seems to turn on a seemingly chance event. In All's Well that Ends Well, Helene's pilgrimage to win back Bertram succeeds on the basis of her chance meeting with the mother of a virgin whom Bertram is courting. Time is another crucial determinant. Often a split second or brief interval is the difference between life and death. In this small but all important gap of time, the character of life is revealed most clearly. In As You Like It, Orlando came in time to save Oliver from the serpent that was winding around his neck. Out of context, these events would appear as a very thin and frail fabric upon which to build great comedy and tragedy were it not for the fact that they are true to a deeper level of causality in life. Suzanne Langer has called comedy 'an image of life triumphing over chance.' It may be otherwise stated that in comedy the s eemingly chance events of life move in favor of a positive resolution, whereas in tragedy they seem to conspire toward disaster. Helene Gardner observes that 'comedy is full of purposes mistook, not "falling on the inventor's head" but luckily misfiring altogether. In comedy, as often happens in life, people are mercifully saved from being as wicked as they meant to be.' 5   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   Time as well as chance events are expressive of another set of determinants, another level of causality in the wider plane of life. The critical gap between human action and its results depends on the response of the environing life and expresses the character of life in the given circumstances.

Ise Determination of Fluoride Content in Various Substances

ISE Determination of Fluoride Content in Various Substances CHM 222 – A 4 / 20 / 2007 Introduction:The ion selective electrode used was made up of a silver / silver chloride reference electrode and a glass electrode. The pH of the electrochemical cell is determined by monitoring the electrical potential difference between the half-cells. The glass electrode is an ion selective electrode (ISE), which only responds to the hydronium ion concentration / activity in a solution under a large range of conditions. In this experiment, we are measuring the fluoride ion concentration, which means our electrode responds to fluoride ion concentrations. Procedure And Data: |Standard Solutions | |Concentration (M) |Potential (mV) | |0. 9967 x 10-6 |15. 0 | |0. 9967 x 10-5 |1. 4 | |0. 9967 x 10-4 |-42. | |0. 9967 x 10-3 |-101. 1 | |0. 9967 x 10-2 |-160. 8 | |0. 9967 x 10-1 |-219. 0 | Unknown #6 was used for this lab group. It produced a potential difference of -196. 8 mV. This was then used in the equation derived from our standard solutions and found to have a [F-] = 0. 0618 M. Preparation of the toothpaste sample was done by a sonicator. Then, the electrical potential difference was measured again, just as in the standard solutions and unknowns. It was found to have a potential of -85. 6 mV. Inserted into the equation, [F-] = 3. 31 x 10-4 M. Calculations:See attached sheets. Results:Toothpaste [F-] = 3. 31 x 10-4 M Unknown #6 [F-] = 0. 0618 M Label Value in Toothpaste 0. 15% w/v Calculated Value in Toothpaste 0. 8 mg / g 0. 8 mg/g converted to w/v (g/100 mL) is approximately 0. 1144% w/v. In comparison with the label, the calculated error is found to be about -24%. A potential source of error could be found in the method of dissolving the toothpaste. There were a lot of bubbles formed, thus allowing for greater possibility of misreported volumes of solution. Also, the pH / V meter had difficulty settling on values during the standard measurements, which would alter the regression line. The ISAB seemed to work better with stronger concentrations of [F-], as the regression line fit better toward the latter part of the plot. However, the pH region seemed to be less important than the [F-] concentration.

Essay on Anti-Vaccine Movement An Ongoing Battle

Anti-Vaccine Movement: An Ongoing Battle Should children’s health be at risk for the greater good of community health? The news today is full of tragic stories about complications of vaccine use and there have been injuries from the beginning of vaccine use due to incomplete data on the side effects. The injuries have also brought about changes in the way vaccines are manufactured. The Georgia State Government requires citizens to receive vaccines in order to attend day care, go to school, and work at certain jobs and each state has its own mandates as well. The only way to get around the vaccine is to claim religious or medical exception. For either of these exceptions, one has to have a notarized affidavit for religious exception or a†¦show more content†¦They know that the vaccines are harming children and some adults but think the benefit is worth the sacrifice of the few. Health officials caution that no vaccine is 100% safe, but they sponsor studies that conclude the benefits of vaccines far outweigh the risks. Vaccines are approved after just a few short years and the research is sponsored by vaccine manufacturers and public health bodies, who have financial and bureaucratic interests that could impede the objective study of vaccine safety (Delong 55). Public health officials and vaccine manufacturers should not be allowed to pay for research the vaccine or do the clinical trials. The government should be responsible for safety studies since the taxpayers are paying for the claims. The research should be unbiased with studies that show the negative effect of vaccines on healthy individuals. The Center for Disease Control (CDC) and the Food Drug Administration (FDA) have the greater good of the country at stake and both have an agenda to vaccinate against devastating disease. If the public loses confidence in the vaccines, they would not be vaccinat ed. Imagine what would happen if the vaccines were unavailable for some reason. All the diseases would reappear and wreak havoc on the medical community (Orfitt 182-185). The manufacturers have reputation and financial gain to consider. If the need forShow MoreRelatedAerial vehicle is also known as drone. It’s an aircraft without a human pilot on it mostly under1700 Words   |  7 Pagesconversances of every component circulating in the air. Aerial surveillance of large areas is made possible with low cost UAV systems. Surveillance applications include livestock monitoring, wildfire mapping, pipeline security, home security, road patrol, and anti-piracy. The trend for the use of UAV technology in commercial aerial surveillance is expanding rapidly with increased development of automated object detection approaches. 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