Advantages And Disadvantages Of Optical Fibers

Advantages And Disadvantages Of Optical Fibers A light travels in straight lines as we know it is highly impossible to make it follow a curved path to glimmer around corners. In 1970s there was a great improvement and faster growing in fibre optics communications. The main idea of light in communication system is evolved from simple signal fires and lamps. Claude chappe has a first modern attempt in optical telegraph built in the 1790s.The first problem was alleviated with the advent of semiconductor age, the semiconductor laser invented by Theodore maiman in 1962 LED(light emitted diode) is improved in optical fibre which solved the problem o0f passing light through air. The communications through optical fibre was proposed in 1966 by Charles Kao and Charles Hockham of the standard telecommunication laboratory in England. In the past few decades many technologies are introduced among them optical fibre communication is the best communication system. The main components of optical fibre are core, cladding and coating. The main duty of core is, it carries a light from transmitter to receiver. Core: It is a smallest part in optical fibre communication system. It is very delicate optical fibre cable Generally it is made up of plastic or glass. The core made up with glass is mixed with pure silicon dioxide other impurities like germanium or phosphorous. These impurities are added to improve the refractive index at certain conditions The range of glass core is from 3.7 µ to 200 µ. 1.48 is the refractive index of core The core made with plastic is larger than glass. Cladding: It is the protective and surrounded layer of core. It provides the low reflective index. In glass cladding the core and cladding is made with same material Different quantity of impurities is added to both core and cladding in order to make a difference in refractive index among them is about 1%. 1.46 is the refractive index of cladding 125 µ and 140 µ are the standard cladding diameters Coating: This is the main protective layer for the entire optical fibre. It protects the optical fibre from shocks and other external damages. Coating has an outside diameter of either 250 µ or 500 µ. Coating is colour less but to identify the coating in some applications it is coloured. 2) Advantages of Fiber optics: The band width of optical fibre is very high when compared with other communications. To increase band width in fibre optics is very easy. Data transmission is very fast in fibre optics. We can transmit data to longer distances without any noise. It is very difficult to tap the information because it is much secured. 3) Disadvantages of Fiber optics: Installation of fibre optics is very cost. When we face any problem with fibre optics we require special test equipment. Communication with fiber optic cable is more cost when compared with different broad band connection costs. In rural areas fiber optic communications are very less, in these days this is one of the main disadvantage of fiber optic. 4) Fibre Optic Losses: Due to bending and breaking of optical fibre cables losses are occurred in fibre optics. Mainly there are two types. Intrinsic losses. Extrinsic losses. 4.1) Intrinsic losses: A slight variation from one fibre to another fibre even manufactured with in specified tolerances. Losses are occurred by these variations. In Intrinsic losses there are four types of losses. They are NA (Numerical Aperture) mismatch losses. Core diameters mismatch losses. Concentric mismatch losses. Elliptical mismatch losses. Cladding diameter mismatch loss. 1) NA (Numerical Aperture) mismatches losses: If there are two optical fibres are repaired we are connecting them with splices during this connection mismatches are occurred because the cone of acceptance in the receiving fiber cannot gather the complete light emitted by the transmitting fiber. This means the light is not travelling completely. This mismatch loss is known as numerical aperture mismatch loss. 2) Core diameter mismatch losses: The difference between the core diameters is the reason of this loss. When the transmitting core greater than the receiving core or transmitting core is lesser than the receiving core light is not completely travelling. This type of mismatch is called as Core diameter mismatch losses. 3) Concentric mismatch losses: In ideal conditions the core the core and cladding are concentric, that means a single geometric centre is shared between them. The fibre core is likely to be offset by a slight amount from the cladding centre. In fiber cores when the transmitting and receiving are non concentric. They will not meet exactly and the light coming from the transmitting fiber is lost. 4) Elliptical mismatch losses: If the fiber cores not the perfectly circular and fiber cores and cladding are not perfectly concentric this types of losses are occurred. The transmitting optical fiber core is not match with receiver core. 5) Cladding diameter mismatch loss. If the diameter of the cladding are not same on the both fiber optics. This type of mismatch is occurred. This means the transmitter light is not completely sending to receiver core. 4.2) Extrinsic losses: Generally in an ideal optical fibre the cores are centred on each other they are placed at 90 degrees angle to their faces. The ends should be in firm contact. Any miss arrangement in these conditions can cause some loses in the signal. There are three types of extrinsic losses. Lateral displacement. End separation. Angular misalignment. 1) Lateral displacement: If the centres of core of two optical fibers are do not match this loss may occur. If the displacement increases less light from the transmitting fiber makes its way into the receiving fibre. A little amount of displacement is acceptable in larger fibers because the majority of the core s surface area is still in contact. In smaller fibers a slight offset can place the centre of the transmitting core entirely outside of the receiver core. 2) End Separation: The end separation loss is due to Fresnel reflection, it takes place when the light passes from fiber refractive index into the air and vice versa. In refractive index each and every change causes an amount of reflected light and therefore the loss is occurred. 3) Angular Misalignment: The optical signal will suffer from these losses when the fibers meet an angle. The solution for this loss is to arrange the fibre end properly that the both ends are in the same line during splicing. 4.3) Major causes of losses: Absorption loss. Scattering loss. Linear scattering losses. Non Linear scattering losses. Coupler losses. Insertion losses. Reflection losses. Impurity losses. Macro bending and micro bending losses. Packing fraction loss. Absorption loss : Absorption loss is occurred by the impurities in the fiber it self such as water and metals. Material absorption losses: Material absorption losses are occurred by absorption of photons within the fiber these losses represent a fundamental minimum to the attainable loss. Intrinsic absorption losses: Interaction with more than one component with glass leads to the intrinsic absorption loss. Scattering loss: I couples energy guided to radiation modes which causes the energy losses from the fiber. If there is a core diameter irregularity in fiber access direction also a reason of scattering losses. Linear Scattering loss: The quantity of light power is transferred from wave is directly proportional to the power in the wave it also causes by inhomogeneties in the glass when the size of it smaller than wave length. Non linear scattering loss: If the electric field with in the fiber has high values then it leads to the presence of non linear scattering ,it also causes when significant power is scattered in all the directions. Coupler loss: The fiber optics coupler are active or passive devices the coupling loss in optical fiber is defined as, = output power =inputpower Connection losses increased by fiber to fiber connection due to the following sources of intrinsic and extrinsic. Mainly we have four types coupling losses 1.Reflectionlosses. 2.Fiber separation. 3.Fiber misalignment. 4.Fiber mismatch Insertion losses: Insertion losses are combination of coupling loss and additional fibre losses. If joints of fiber can increased the attenuation of fibre this is done in multimode operation. Fiber joints can leads to the second order mode in single mode fiber. Reflection losses: Light waves of reflection and transmission occur because frequency do not match the natural resonant frequencies of vibration of object. Impurity losses: The first source of impurities material in glass fibre is metallic ions, the loss due to this reduces the contribution below 1DB/KM. Macro and microbending losses: These loss may occur due to sharp bend in fibre, to produce high losses a short length of optical fibre is to be bend, as tight as the fibre optic the losses are worst. The major problem in macro losses is in the hands of the installer.The losses in micro bends is same as the macro bands but it just differs in the size and cause. The radius is equal or less then the diameter the outer layer will shrink and get shorter when the fibre is too cold, fibre optic cables are available with a range of temperatures from C to C. Macrobend Microbend Packing fractin losses: Single emitter sometimes uses a bundle of fibres, if claddings are in contacts many fibres are packed together. Large area source can match a large bundle in order to eliminate area mismatch loss. Small sources can emit less like than the larger once , in single fibre larger one has more power to couple into a bundle than into a single fibre. Fibre optic as a sensor: Sensor provide link to interface between the electronic units and physical world the sensor can detect physical and chemical qualities such as temperature, pressure, vibration, flow , acceleration, proximity,and chemical concentrations. A basic sensor is made upof a light source(laser or led), a length of fibre and optical detector. Fibre optic itself acts as a sensor by varying he intensity of light these measurements are done. Only the source and the detector is required in the sensors hence it is very simpler. Based on the performance characteristics there are four different types of sensors they are 1. Extrinsic sensors. 2. Intrinsic sensors. 3. Fibre bragg grating (FBG sensors). 4. Long period grating sensor. Extrinsic sensor: In extrinsic sensors the outside part of the fibre undergoes to the sensing effect. The fibre acts as a collection system in light delivery. For example a chemical sensor utilizes a sensitive material on the tip, light is passà © through the fibre and reflected back. In the chemical solution as the concentration changes the tip properties may change and the reflection of the light also changes which gives the measure of chemical concentration. Intrinsic sensor: In intrinsic sensor the changes takes place within the fibre. The change is outside the fibre and the fibre remains unchanged when the intrinsic sensor is in contract to extrinsic sensors. For example when a fibre with ruff surfaces is placed between two plates, the fibre is pressed by the plates when the pressure increases the attenuation of the fibre increases due to this. Bend and micro bend sensor: Bent in a optical fibre leads to a portion of propagating light beam along the bend is incident at angles must be smaller than the critical angle by which attenuation, this can be used for sensing measure load and stream are found by this mechanism, lose of power occurs if any load lead to a bending of fibre. This measure gives the distribution of strain and load with the use of lost power. A series of random bends and small bends along the fibre is known a micro bending. It acts as a coupling between cladding and core modes in a single mode fibre and between multimode fibre. Fibre bragg grating(FBG Sensor): TO MEASURE TEMPERATURE AND STRAIN: To measure sensing mechanical strain, temperature and acceleration we use FBG sensors. Parameters that changes any of these results in a change in reflected wavelength, these changes when measured, sensing or external perturbations can be done. Long period grating sensor: Periodic perturbations along the length of the fibre with periods greater than hundred micro meters which includes coupling between the light propagating in core and cladding is long period grating. Cladding code influence the power transmitter through the fibre used to find the refractive index when there is any change in the medium around the fibre. Interferometric sensors: # In this the light is transmitted through to fibres. one of them (reference arm) isolated from environment and its properties are constant. And another fibre (measure arm) is exposed to parameter during sensing. The face of the light is changed by the parameters. The interferometric sensors has the greatest sensitivity and it has highest performance capabilities. The Interferometric sensor. ( John F.R, 1997, pp-543). ADVANTAGES OF FIBRE OPTICS SENSORS: It allows an access to normally inaccessible areas of interest. It is an non-electrical. Due to small size and less weight of the sensors it effective in cost. It has high sensitivity. It has high reliability. It is very easy to install. Transmitter: Transmitter converts electrical signal into light signal. It has two functions Light emitter Regulator Light emitter: It works as a soirce of light coupled into optical cable. Regulator: It modulates the light to represent the binary data. Light emitting diode: The transmitter are directly modulate when the drive current passed through the LED is varied. The power is directly proportional to the current flowing in the LED. According to the applications the drive currents is measured. The drive current is switched on and off in digital applications. And the current is varied in Analog application. The LED transmitter is packed with the receiver since the space is reduced and simplifies the circuit designing which reduces the cost. Characteristics of the LED: Recommended operating conditions. Electrical characteristics Optical characteristics Data rate Recommended operating conditions: It describe the temperature and voltage ranges that device can operate in without damage. Without any fluctuations the maximum and minimum operating temperatures can be measured. Electrical characteristics: It describes.. the required supply current Data output voltages Signal detect output voltages Rise fall times Optical characteristics: It includes Minimum optical input power Maxcimum optical input power Operating wavelength

Attitudes to Language Essay

Language clearly plays a major role in all aspects of society. The most obvious is its social role of allowing people to relate to each other in all facets of their lives: to share information, emotions and ways of life. We use language as a means of navigating our daily lives and it plays an integral role in most of our interactions. Perhaps for this reason, French is regarded as an elegant and romantic language, while German is considered to be guttural. Additionally, ever since mankind evolved into different language communities, it is commonplace for people to adopt various attitudes towards the language(s) spoken by others, as well as towards the dialects of the language they speak. These attitudes are motivated by different factors, including pride in or shame regarding one’s own language, confidence or embarrassment about how one sounds, nationalism and a sense of personal dignity, one’s status and values as well as the prestige some languages are given in international interactions. A well known attitude is the desire for foreign speech patterns; another is the rejection of certain dialects. People form impressions of your personality, emotional state, geographic origin, education, experiences, age or socioeconomic status from the language you use and the way you use it. We often witness the amusement of an audience when someone speaks in the creole, for not only does the system of sound evoke laughter, but the assumption that the speaker is an uneducated serf is then made. Ridicule and contempt for the vernacular, creoles and dialects are common responses from some members of society, even within the Caribbean society, where dialects are rich, strong and the first language. Dialects develop under various circumstances as well as geographical locations and are varieties of languages. A creole could be a dialect within a language. Because of our history, people of the region tend to place a high premium on the standard languages (the language of power and economic might). Many  people believe that upward mobility is largely dependent on one’s ability to fit in with the predominant socioeconomic class, and language is the main signifier of this fit. Many Caribbean writers have described scenarios of people who went overseas, were generally expected to return with a new command of the target language and often demonstrated their new found ‘status’ by emphasizing their foreign accent of ‘twang’. While some might be impress ed by the ‘twang’, others view such pretensions with derision. Attitudes to language may vary from one sector of the society to another and some people demonstrate self-conscious behavior when speaking the standard language. This is largely a result of the fact that in most societies one is often judged on the basis of the variety of language that one speaks. This is even more prevalent in societies with a colonial legacy, like the Caribbean, where certain dialects are associated with the institution of slavery or conquest. Increasingly, educators are becoming aware that a person’s native language is an integral part of who that person is and marginalizing the language can have severe damaging effects on that person’s psyche. Many linguists consistently make a case for teaching native languages alongside the target languages so that children can clearly differentiate among the codes ( a term used synonymously with language or dialect but generally refers to a linguistic system of communication. A code can also be non-linguistic such as a dress code or code of conduct) and hence be less likely to mix the two. This approach has been adopted in Haiti, where schools teach both Standard French and French Creole (Haitian) and children are expected to be fluent in both. Additional prominence has been given to Caribbean Creoles with the publication of Creole dictionaries and with the translation of the New Testament from the Christian Bible into French Creole in St. Lucia. A similar project is under way in Jamaica. While attitudes to local dialects have been slowly changing, many people still associate the use of Creole with negative images and believe that its use should be relegated to specific circumstances and occasions. However, the fact that non-standard language varieties are the most widely spoken in the Caribbean makes them the choice of persons trying to get information to large sections of the society. For example, many advertisers use the Creole language to ensure that their message appeals to most people. At the same time, because of the prestige attached to the standard language, it tends to be the language of choice on formal occasions, like church services. A language variety is usually chosen because of its perceived social functions. You may have noticed that, the more formal the occasion, the more likely the use of the standard language, while for everyday interaction, popular music or emotional appeals, people tend to gravitate towards the non-standard varieties. You would have noticed that, even in a formal situation, non-standard dialect might be used for anecdotes, to inject humour or in a quotation. In the Caribbean, people switching from one code of language to another, often without thinking. However, there are times when the use of standard langue would seem totally out of place and would even interfere with semantics. For example, folk stories, folk songs and proverbs seem to lose a certain essence when translated into standard. The role of language as a vehicle for sharing culture is indisputable. Caribbean writers, singers and oral poets have played a major part in fostering acceptance of the Creole languages of the region, by incorporating them into their work and exposing them to the world. Nonetheless, negative attitudes to these languages persist in the minds of many.

Meteorological Modeling In Klang Valley Region Malaysia Environmental Sciences Essay

It has been widely known that alterations of the land surface from flora country to urban country can well impact the environing meteoric status. Meteorologic theoretical account was used to measure meteoric status for air quality mold and prediction. One of the inputs for the meteoric and air quality theoretical account is land usage and land screen of the terrain. In this survey, we examined the sensitiveness of land usage and land screen on the predicted meteoric conditions. A meteoric simulation utilizing 5th coevals mesoscale theoretical account ( MM5 ) by Penn State/NCAR was used to compare the effects of land usage from two different old ages on meteoric status. The predicted meteoric conditions are so compared with the several monitoring station onsite. Consequences showed improved of surface wind velocity and temperature simulated utilizing improved land usage map. Findingss suggest land usage map should be taking into consideration in historical meteoric Fieldss to entree f uture air quality if the country of survey expects big alterations in land usage form. Keywords: Meteorologic mold ; Land usage ; MM5 ; Urban. Introduction It has been widely known that alterations of the land surface from flora country to urban country can well impact the environing meteoric status. Urbanization of an country could take to alterations of meteoric parametric quantities such as boundary bed deepness, perpendicular diffusivity, wind stableness category, etc. These meteoric parametric quantities played an of import function in most of the air quality theoretical accounts that predicts the concentration at each grid. Harmonizing to Jacobson ( 2002 ) , one of the factors that affect air pollution is the local air current which ensuing from uneven land warming, variable topography and others. In another word, different land usage type may take to uneven land warming, because land screen affects ground temperature, which affects pollutant concentration finally ( Jacobson, 2002 ) . Meteorologic and air quality theoretical accounts require land usage and surface feature that differ by their land usage and land screen forms ( Civ erolo et. at. , 2000 ) . Another survey carried out by Jazcilevich et Al. ( 2002 ) suggested that alterations of the land usage type could impact its environing meteoric status and scattering of air pollutant. Much of the current apprehension of the urban clime and meteoric status in Malaysia resulted from the research on Kuala Lumpur and Petaling Jaya country begins from 1970s ( Sham, 1973a, 1973b, 1979a, 1979b and 1987 ) . These researches focused on the description of the climatology and meteoric facet such as air current and temperature parametric quantities associated with urban heat island. The meteoric facets of the Kuala Lumpur and the environing metropoliss may alter due to the change of land usage and land screen by urbanisation and development of the metropolis. However, no survey had been done to entree the meteoric status of Klang Valley part with current land usage and land screen. The meteoric theoretical account used in this survey was the Fifth Generation Mesoscale Model ( MM5 ) from PSU/NCAR ( Grell et al. , 1994 ) . In this theoretical account the land usage was simulated from the planetary flora dataset from USGS which available at 1 grade, 30 min, 10 min, 5 min, and 30 unsweet declaration. However, the informations were derived from satellite observations over a period 1992-3 and the flora classs were out of day of the month and non relevant to the country of survey. The aim of the survey is to find to the effects of the land usage and land screen alterations on the meteoric mold system. Land usage map of twelvemonth 2000 obtain from the Town and Country Planning Department ( JPBD ) will be used to better 1992-3 USGS land usage dataset. The Modeling System PSU/NCAR Fifth Generation Mesoscale Model ( MM5 ) was selected as the meteoric simulation patterning system in this survey. The MM5 theoretical account is non-hydrostatic with terrain following co-ordinates, multi-scale, capable of interface with existent conditions prognosis theoretical accounts ( Global Circulation Model ) , contains expressed cloud strategies and dirt parameterization. MM5 is widely used by the meteoric community and its end product could be coupled together with the Sparse Matrix Operation Kernel Emission ( SMOKE ) theoretical account and Community Multiscale Air Quality ( CMAQ ) theoretical account to imitate the scattering of the air pollutants that take in considerations of the meteoric Fieldss and emanation beginnings. MRF Planetary Boundary Layer ( PBL ) parameterization strategy was selected in this survey. The 4-dimensional informations assimilation ( FDDA ) option was non used was selected in this survey because the purpose of the survey is to analyze the effects of modified land usage on the theoretical account end product. For inputs of informations, land usage datasets from USGS will be used as the default land usage, and land usage map from Town and Country Planning Department as the improved land usage and NCEP FNL ( Final ) Operational Global Analysis information was used in this survey. Domain Setup Four spheres are used as shown in Figure 1 for this survey. The female parent sphere with the declaration 27km covers the most of the Peninsular Malaysia ; 2nd sphere with the 9km declaration screens Selangor province ; 3rd sphere with 3km declaration screens ; finest sphere with 1km declaration will covers the survey country which is Klang Valley. Figure 1: MM5 domain apparatus. Processing of Land Use and Land Cover In the MM5 mold system, each grid cell was assigned one land usage based on the dominant class in the grid cell. 24 classs of Vegetation type by USGS was used in categorization of land usage in MM5. Each land usage categories consists of six surface parameterization, which includes, reflective power, wet handiness, emissitivity at 9 A µm, raggedness length, thermic inactiveness, and surface heat capacity per unit volume giving together with the MM5 theoretical account. Since Malaysia is a tropical state, summertime values are used. Out of 24 land usage types in the MM5 theoretical account ( Guo and Chen, 1994 ) , 14 classs was used to to the full depict the full sphere ( Figure 2 ) , with 22 % classified as H2O organic structures, 0.4 % as urban country and the largest non water-based class is Irrigated Cropland and Pasture ( 39 % ) in sphere 3 and as for sphere 4, 10 % classified as H2O organic structures, 1 % as urban country and the largest non water-based class besides class is Irrigated Cropland and Pasture ( 37 % ) ( Table 1 ) . Figure 2: USGS land usage dataset sphere 3 and domain 4. Since the Land usage dataset from USGS was generated from the twelvemonth 1992/3 orbiter image, the development of the Klang Valley country for the past 15 old ages decidedly changed the land usage and land screen of the survey country. To better the land usage type, updated land usage map from the Town and Country Planning Department was referred in this survey. The updated land usage map was preprocessed from polygon to gridded land usage map based on the categorization of the 24 USGS land usage classs ( Figure 3 ) .The per centum differences of the land usage between the default land usage and the update land usage are shown in ( Table 1 ) . Table 1: Percentage of landuse class for USGS and JPBD land usage Domain 3 and Domain 4. Land usage codification Land usage class USGS Land usage Domain 3 ( % ) USGS Land usage Domain 4 ( % ) JPBD Land usage Domain 3 ( % ) JPBD Land usage Domain 4 ( % ) 1 Urban and Built -Up Area 0.4 1.0 25.1 40.6 2 Dryland Cropland and Pasture 12.1 17.0 0.0 0.0 3 Irrigated Cropland and Pasture 40.2 37.4 0.0 0.0 4 Mixed Dryland/Irrigated Cropland and Pasture 0.0 0.0 20.4 28.0 5 Cropland/Grassland Mosaic 0.0 0.3 0.0 0.0 6 Cropland/Woodland Mosaic 1.0 1.0 0.0 0.0 7 Grassland 0.7 1.7 0.0 0.0 8 Shrubland 3.7 7.6 0.0 0.0 10 Savanna 0.1 0.2 0.0 0.0 11 Deciduous Broadleaf Forest 13.4 16.5 0.0 0.0 13 Evergreen Broadleaf Forest 2.8 1.1 0.0 0.0 14 Evergreen Needleleaf Forest 0.3 0.5 0.0 0.0 15 Assorted Forest 2.7 5.3 34.4 25.0 16 Water Bodies 22.4 10.3 17.8 6.5 Figure 3: Gridded JPBD land usage in 3km and 1km declaration. An ASCII type of input file was generated based on the reclassified land usage map into specific format. This ASCII file contains column, row, land usage type, latitude, longitude, flora fraction, and H2O fraction ( Figure 4 ) . Figure 4: Example of ASCII format input. The FORTRAN codification named â€Å" replace_lulc.f † is used to replace the land usage type, flora fraction and H2O fraction in the TERRAIN_DOMAINx file based on the co-ordinates of the reclassified grid cells and the several land usage type, and other parametric quantities provided in the ASCII file. The FORTRAN codification is compiled utilizing run book â€Å" run.replace † which besides determines the input and end product files to treat, and parametric quantities to be updated ( Figure 5 ) . Figure 5: Example of run.replace book. MM5 Simulation Results MM5 simulation was performed from 1st July 2005 ( 18:00 ) to 3rd July 2005 ( 17:00 ) with entire simulation clip 48 hours utilizing USGS flora dataset for 27km, 9km, 3km and 1km spheres as base instance. The 3km and 1km sphere will be compared with the end product of MM5 simulation using JPBD land usage dataset during for same period. All the physical options used were indistinguishable for both simulations. Observation from the Continuous Air Quality Monitoring ( CAQM ) station from Alam Sekitar Malaysia Sdn. Bhd. ( ASMA ) and Malayan Meteorological Department ( MMD ) was used to formalize MM5 public presentation from the both USGS and improved land usage dataset. Three CAQM site was selected to formalize the MM5 public presentation, which are the monitoring station in Klang and Shah Alam that maintained by ASMA and supervising station in Subang that operated by MMD. The simulations that utilized USGS land usage dataset showed overestimate of the air current velocity and produces sudden extremum at certain hr in the simulation. The improved land usage dataset utilizing JPBD land usage informations reduces the air current velocity and frequence of the sudden extremum, yet still over estimated the overall air current velocity compared to the observation informations ( Figure 6 ) . However, the improved land usage dataset utilizing JPBD do increase the correlativity between the ascertained air current velocity and simulated air currents velocity from all CAQM site ( Table 2 ) . The lowered air current velocity due to the improved land usage informations set could take to increased stableness and decreased perpendicular commixture. This could increase the air pollution concentration in certain country. The temperature profile simulated by both utilizing USGS and JPBD land usage dataset able to imitate the afternoon temperature near surface when comparison with the onsite observation temperature informations. However, both USGS and JPBD land usage dataset tends to overrate the temperature near surface during the dark ( Figure 7 ) . The correlativity between ascertained temperature and fake temperature somewhat increases when use JPBD land usage dataset in the simulation for the all monitoring site ( Table 2 ) . The consequences suggest that improved land usage dataset utilizing JPBD land usage dataset could better the overall simulation consequence ( Table 2 ) . The alterations of the meteoric parametric quantities could impact scattering of air pollutant, energy demand that could impact anthropogenetic emanations. The alterations of the MM5 end product could besides impact the computation of the air pollution patterning package such as CMAQ. Figure 6: Time series comparing of windspeed at 1km sphere for Shah Alam. Figure 7: Time series comparing of 1.5m temperature at 1km sphere for Shah Alam. Figure 8: Correlation between observed and predicted informations at Shah Alam. Table 2: Summary of correlativity between observed and predicted informations for all the location. Parameter Sphere Monitoring Station Klang, ASMA Shah Alam, ASMA Subang, MMD Wind speed 10m Domain 3 USGS 0.034 0.082 0.176 Domain 3 JPBD 0.311 0.318 0.214 Domain 4 USGS 0.015 0.083 0.169 Domain 4 JPBD 0.277 0.273 0.254 Temperature 1.5m Domain 3 USGS 0.673 0.672 0.410 Domain 3 JPBD 0.774 0.788 0.537 Domain 4 USGS 0.666 0.657 0.411 Domain 4 JPBD 0.790 0.759 0.544 Discussion The land usage is merely one of many factors that take in consideration by the meteoric mold system. The consequences showed betterment of the fake air current velocity and temperature near surface. The public presentation of the MM5 on simulation could be improved by modifying the MM5 physical options and strategies depending on the declaration and location of the survey country. Since the land usage and land screen alterations affects the close surface meteorological, it should be included as one of the cardinal factors in the air pollution patterning particularly future air quality scenario. The alterations of the temperature that lead by land usage could increase downwind, and potentially affects the air quality simulation. The alterations of the air current velocity besides affect the dispersion of air pollutants and blending in the ambiance, alterations of the air pollutant concentration are expected. Changing in the land usage and land screen forms due to the urban conurbation, altering of agricultural forms, forestation and deforestation are expected to affects to landscape. The change of landscape will take to alterations in population, energy ingestion, anthropogenetic and biogenic emanations. The consequences suggested that land usage should be taken into consideration when utilizing air quality calculating theoretical account to predicts and measure the air quality. Recognition The writers thank the Ministry of Science and Technology ( MOSTI ) Malaysia for back uping this research, under undertaking no. 04-01-04-SF0674. We besides thank Department of Environment ( DOE ) Malaysia, Malaysian Meteorological Department ( MMD ) and Town and Planning Department ( JPBD ) Malaysia for informations providing. The Positions expressed by the authours do non neccesarily reflect those of the bureau.

A Brief Note On The War Of 1812 - 946 Words

Auset Gibbs January 27, 2015 APUSH The War of 1812 According to Washington National Intelligencer, â€Å"The final step ought to be taken, and that step is WAR. By what course of measures we have reached the presents crisis, is not now a question for patriots and freeman to discuss. It exists: and it is by open mainly war only that we can get through it with honor and advantage to the country.† The War of 1812 was military a conflict between the United States of America, France, and Great Britain. This war lasted for two and a half years. Europe saw the war as a theatre of the Napoleonic Wars. On June 18th, 1812 the United States declared war on Great Britain. For reasons, including trade restrictions, the impressment of American merchant sailors, British support of Indian sailors against American expansion, and American interest in adding British territory in Canada. The war was fought in three major theatres: at sea, land, and the Gulf Coast. 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Americans realized that they had to start producing their own goods and becoming more independent. This was the start of the Industrial Revolution. After manyRead MoreThe Revolutionary War1664 Words   |  7 Pagesthe monetary agent of the US government which was needed to help deal with the funding of the Revolutionary War. Prior to the ratification of the Articles of Confederation Perpetual Union in 1781, only the thirteen states had the sovereign power to issue their own bills of credit. Therefore before the ratification it was State Chartered banks that were providing the credit for the war, through the use of continental currency or â€Å"continentals.† These continentals were depreciating in value toRead MoreThe American Character Essay1814 Words   |  8 Pagescharacters, GENERAL WASHINGTON† (Matthews, 2007, para. 33). Rip becomes confused as he not es the changes in the sign where George Washington replaces King George III. The sign symbolizes and validates the colonists’ freedom from Britain where a monarchy replaces democracy. With the conclusion of the Revolutionary War comes the replacement of King George III’s rule with the presidency of George Washington. As the war comes to a victorious close with freedom to the American colonists Irving writes, â€Å"’OhRead MoreThe War Of 1812 And The Chesapeake Bay2639 Words   |  11 PagesThe War of 1812 and the Chesapeake Bay On March 3rd, 1813, the first British ships of war appeared on the Chesapeake Bay. For two years the Chesapeake would be the scene of numerous amounts of battles. Some would be lost in anonymity, but others would make history. But first, why did the British come? We were at war almost thirty years before, so how did it come upon these two superpower nations to collide once again? A few answers to these questions will put the war of 1812 and the Battle of theRead MoreJames Madison The Power of One1345 Words   |  5 PagesPresident of The United States of America. He selected James Madison as his Secretary of State. As Secretary of State, Madison oversaw the Louisiana Purchase, The Expeditions of Lewis and Clark, Barbary Wars and the fragile stratagem of how to deal with Britain (who they were on the brink of another war with). He handled foreign affairs and slowly his work as Secretary of State consumed aspect of his life. Louisiana was a fast territory owned by France and took up the whole area west of the MississippiRead MoreThe San Diego Symphony Hall2612 Words   |  11 Pageshis worsening medical condition. Other works composed by Beethoven include his only opera, Fidelio, in 1805; Symphony No. 6 in F Major, Op. 68, also known as the Pastoral Symphony, in 1808; Symphony No. 7 in A Major, Op. 92, in 1812; Symphony No. 8 in F Major, Op. 93, in 1812; his final symphony, Symphony No. 9 in D minor, Op. 125, also known as the Choral; four solo concerti; five string quartets; six string sonatas, including Violin Sonata No. 9 in A Major, also known as the Kreutzer Violin Sonata;Read MoreRacial Diversity, Integration and Equal Opportunity in Us Army;3586 Words   |  15 Pages Table of Contents Certificate of Authorship 1 Title Page 2 Table of Contents 3 Abstract 4 Introduction 5 Minority Service to the US Army - A Proud History 5 The Revolutionary War 5 The Civil War 6 Buffalo Soldiers 6 World War I and World War II 6 The Korean Conflict 7 Vietnam and the Mandatory Draft 7 The All-Volunteer Army 8 Army Demographics 8 Equal Opportunity and Sexual Harassment Complaints 10 ConclusionRead MoreAndrew Jackson Was An Influential President1989 Words   |  8 Pagesthe United States. Before and during his time as president Jackson did many important things that ultimately benefited the country as a whole. One of the most valued contributions that Jackson made to the United states was his actions during the bank war. Jackson’s quest to take down the national bank started even before he became president. However when he became president he realized that he had the perfect opportunity to get rid of the bank once and for all. Jackson had never liked banks and he madeRead MoreRecovering The Indigenous Past : The Mandan People Who Lived And Still Breathe At The Heart Of The World1866 Words   |  8 Pagesdemonstrating that the Mandan people had little care for the seminal events that unfolded to the east. This is not to say that Fenn believes Spanish conquistadors, Anglo and French colonization of eastern North America, the American Revolution and War of 1812, Napoleon’s designs on the â€Å"heart of the continent,† and the Haitian Revolution had little impact on the Mandan people, but that the events themselves went unnoticed or were dismissed as unimportant by the Ma ndans, whose concerns and interests layRead MoreJohn Marshall: The Man who Saved the Supreme Court and the Nation2463 Words   |  10 Pagesfuture Virginia patriot and statesman, Patrick Henry, with whom he would meet several more times in his career. The War Years â€Å"The war was a constitutional education for Marshall because it was a colonial revolution that was justified by legal arguments and that it had as its objective the creation of a nation under law† (Newmeyer, 21). Marshall served in the Revolutionary War in several capacities; militiaman, officer and finally as a JAG (Judge Advocate General) officer on General Washington’s