Bank management report Essay Example | Topics and Well Written Essays - 2500 words

Bank management report - Essay Example This requires a combined effort on the part of the organization as well as the individual employee to ensure a fit with the job responsibilities and work profile with the career goals of an individual. The present study would highlight the aspect of occupational analysis to ensure job fit and organizational excellence. Analysis of Occupation Business organizations need to include aspects of labour demand and supply in addition to determining price and output if they want to maintain sustainability of their businesses in the prevailing competitive business environment. The labour demand curve which highlights the marginal productivity of labour as a constant function of the labour quantity is largely determined by the price of output and changes in technology. The supply of labour is largely based on the premise that humans largely tend to make a trade off between leisure and work. They largely assume that work is not enjoyable and work is not enjoyable. However they also realise that leisure normally requires a cost for the individuals. It is widely assumed that an hour of leisure requires a person to sacrifice an hour of wage (University at Albany, 2008, p.1). Figure 1: Labour Demand and Supply Curve (Source: Cuthbertson & Gripaio, 1993, p.7) The figure above shows a typical labour demand and supply curve in a perfect economic scenario. However the equilibrium between demand and supply can be shifted due to change in the individual’s perception towards work. For example previously women were largely discouraged from working which reduced the total supply of labour however with changing times women have become an integral part of the labour force causing the number of workers to increase thereby causing a shift in the supply curve. Alternative work opportunity including immigration also play a role in the shifting of the equilibrium between labour demand and supply as attractive markets outside home would cause a shift in the supply curve to the left (Un iversity at Albany, 2008, p.1-2). Human Capital Human capital or the labour force is largely affected by the aspect of wages. The marginal theory of productivity states that under purely competitive market conditions the wage rate is largely constant and hence a firm has the opportunity to decide on the total number of workers to be hired thus determining the market demand for labour on their own. The element of additional or marginal worker largely helps in determining marginal productivity (Chakravarty, 2009, p.600). Employees also have a propensity to go in for higher studies or look for alternative work options. In both these cases the labour supply reduces and the equilibrium wage price gets increased owning to greater propensity and increased marginal wages of the employees in lieu of their higher education or attractive wages in other organizations. Higher education options among the workers would largely tend to shift the labour demand curve to the rightward direction ensuri ng a shift in the equilibrium point between labour demand and supply (Hubbard & O’Brien, 2008, p.504). Labour Migration In a market characterised by elements of perfect market competition labour

Environmental History Essay Example for Free

Environmental History Essay During the last ice age, around 13,500 years ago, a number of people from other continents came to North America to find food. They have been able to walk across the Bering Land Bridge from Siberia and Alaska. This was likely possible because during that period the sea level were lower that it is today. The melting of the glaciers has cleared some passage for the Alaskan to spread and colonize areas throughout South America within the period of 1,000 years. In their conquest, these people had a major impact on the ecology and wildlife to which they have been destined. Studies on the archeological findings stated that prior to the coming of the early North Americans, the lands were covered with lush vegetation and large species of mammals and birds. The herbivores even included 3 species of elephants such as the woolly elephants, the giant mammoths and the mastodons. Such animals which are common were giant animals like bison, ground sloths, armadillos, beaver and tortoises. Giant predators also are preying on different herbivores. Such predators were the cheetahs, saber-toothed tigers, lions and giant wolves. Most of these large predators have migrated from the boreal forests of Canada to live in the forest of North America. Animal remains of these unimaginable sizes and power of these animals have been found but where and why these species have vanished is a questionable issue. Tim Flannery’s book The Eternal Frontier: An Ecological History of North America and Its Peoples concluded that during the coming of the early North Americans there was what he call the Pleistocene Overkill. He hypothesized that during the colonization of humans and reaching far across the continents, they almost wiped out large herbivores through hunting. Large animals were more noticeable thus making them prime targets. Their low reproductive rates cannot compensate for the losses because of frequent hunting. When these animals became extinct, their predators became extinct as well. The extinction of the predators made an impact in the extinction of large scavenger birds. Only animals which can prey on and frequent the oceans did not suffer high extinction rates during this time. (Moyle Orland, 2004). There are also evidences that the early North American people has manipulated their surroundings and that they have modified their environment as based on observation of settlers from Europe. The settlers have documented that Indians shaped their environment through the use of fire especially during the late summer to minimize the valley’s underbrush and reduce the number of trees. This is to facilitate hunting and do their gathering. While the American Indians are moving across seasonally while using fire for easy game hunting, the European settlers made themselves fences and farmhouses as well and bringing with them domesticated animals and crops. The Europeans however, have influenced some of the Indians to properly control or stop the use of fire and introduced to them the proper use of land use and establishing properties and boundaries for their domain (Northwest, 1998). Eyewitness accounts from the early European explorers, trappers, soldiers and missionaries affirmed that prior to their settlement the wilderness were not pristine but rather the product of remains of thousands of years of usage and management by Native Americans. The Native Americans’ management also has consequences on their ecosystems and one example is the extinction of most large mammal species in North America between 10,800 and 10,000 years ago. This is probably the result of hunting practices of Paleo-Indians as previously mentioned and with the effect of rapid environmental changes. Once again the setting of fires for hunting, land clearance, warfare and signaling as well as forest fires contributed to the degradation of forest and ecology in the pre-modern American era (Bonnicksen, 2000). Based from The Ecological Indian: Myth and History by Shepard Krech III, the Paleo-Indians had a great role in the extinction of animal species in North America. Krech believe that Paleo-Indians played great role in the Pleistocene extinctions about 11,000 years ago when many indigenous animal species in North America vanished. Severe climate changes however were also contributory to the extinctions of such animals. Krech uphold that there was actually human intervention in the exploitation and extinction of animals in that period because of two important evidence. Such were the findings of Paleo-Indian artifacts with the remains of extinct animals and the fact that there was already the extinction of animals before the arrival of European settlers in North America. Notably, the use of fire by the North American Indians was widespread as an important method for their subsistence. Fire is also used for communication, aggression and travel. Notably, vast tracts of forest lands were burned so that animals may move out and go to a place where they could be easily hunted. These aboriginals thus destroyed the habitats of elk, deer, buffaloes, wolves and beaver thus killing them for their meat and fur (Orton, 1999). At the time of the arrival of the Europeans, many Indians were already farmers. Farmers in the East and Southwest were raising corns, beans, pumpkins and squash which are necessary for their subsistence because five thousand years ago, agriculture was already a practice in America. By 1500, millions of acres of were already cleared and planted crops by the indigenous people. Furthermore, there was a constant set of fire to more hundreds of millions of acres to improve game habitat, clearance for travel, reduce insect pests and to enhance conditions to grow berries. Vast areas of forest landscape in the West and East and park-like open spaces are usually smoking with low-intensity fires. Even in New England, Indians burn their woods twice in a year. The frequent burning of forest has created wide open grasslands which were formerly forests. Such indication of human disturbances and alteration in the ecological system were the proliferation of game animals such as the wild turkeys, white-tailed deer, ruffled grouse and other species commonly live only on forest edges and openings. By the end of the early 1600s, bison were roaming the prairies in the south and reached as far as Far East (Maccleery, 1999). The migration of early European settlers to North America, however, has introduced the barter and trade practices with the Native Americans. One of the most earliest and important industries in that period was the fur trade. The fur trade industry has played a great factor in the development of America and Canada for more than three centuries. The trade began in the 1500’s as an exchange of goods between Indians and Europeans and other tools and weapons as well. The Beaver fur was the most valuable of all the furs being traded. The earliest traders of furs in North America were the French explorers and fishermen who came to a place which is now Eastern Canada. With the scarcity of fur-bearing animals particularly the beavers, North Americans and Eskimos set traps as far as Canada. British and French empires were set in America because of fur trade in the early 1600’s. The prospect of wealth with this venture has brought Europeans to the New World thus the establishment of many trading posts in the wilderness. As settlements grew, states were established and later became such major cities as Detroit, New Orleans, and St. Louis. While in Canada, Edmonton, Montreal, Quebec and Winnipeg were also established. Because of its promising wealth venture, the fur trade has created a conflict between France and Great Britain in the American land. There were rivalries over trading and alliances between Indian tribes and other traders. Hostilities however, were shown by other Indians toward white settlers because the settlers prevented the Indians from clearing the forest with burning thus preventing the production of fur-bearing animals. With such disproportionate conflict, border between the United States and Canada were formed. But in the 1700’s, the fur trade started to decline in the Eastern United States as a result from the clearing of large tracts of lands for settlement. As the clearings grew wider, fur-bearing animals increasingly became scarce as well which hurt the trade in the Western America and Western Canada. Silk was found to be an alternative for clothing and accessories when fur-trading was stopped by 1870’s (Stuart, 2007). In conclusion to this, as stated by Shephard Krech III on his Reflections on Conservation, Sustainability, and Environmentalism in Indigenous North America, he has his own debate if really the old North Americans are environmentalists, ecologists or conservationist. As he has mentioned other facts rather than being in assuring, enough evidence must be drawn to come up with more solid proof that indeed they were. However, there is more information and evidence that showed generally, they have not been properly treated their environment in the proper perspective because what they all need in that period was to survive in the midst of a dark and forested land. The American Indians of today, however, are one of the most visible groups in rallying for the preservation of their land, their domain and their culture as well.

LIDAR (Light Detection and Ranging) Technology

LIDAR (Light Detection and Ranging) Technology LIDAR (Light detection and ranging) is a method of determining the topography of the surface using a laser. These pulses generated are recorded which provide precise three-dimensional information about the surface. Today various platform LIDAR is available in the market and those are chosen based on the project requirement. E.g. terrestrial LIDAR, which is fixed in ground, airborne LIDAR, which is placed on a flying platform like an airplane or helicopter and space borne Laser which is fixed on satellite platforms. Two types of LIDAR are available, topographic, and bathymetric. Topographic LIDAR use near infrared laser, whereas bathymetric LIDAR us green light which penetrate the water. The use of airborne laser (LIDAR) for measuring the depth of near shore coastal waters and lakes from an aircraft is getting more popular in surveying industry. The demand for faster and cheaper coastline survey can be replaced by using airborne LIDAR technology. The Airborne LIDAR bathymetry was successfully tested by US, Canada, and Australia in the early 1970s. The system built by Canadian Hydrographic Service (CHS) in 1986, the LARSEN 500 system was the first operational airborne LIDAR bathymetry system. Airborne LIDAR bathymetry has proven to be more accurate, cost effective, efficient, and fast method of collecting shallow water bathymetry data than the sonar technology which is less efficient and hard to operate in many cases. The airborne laser bathymetry involves the pulse laser transmitter which emits green and infrared beams. The wave length of green laser is 532 nm which can penetrate coastal water with less attenuation and can be used for coastal bottom detection. The infrared (IR) cannot penetrate the water and can be used for sea surface detection. The bathymetry sensors consist of four major components, the GPS receiver which records the aircraft position, the inertial measurement unit (IMU) which gives the roll, pitch and yaw of the aircraft, the laser scanner which emits the signal and the receiver sensor which read the returning signal. The LIDAR system can record the accurate measurements by knowing the position and orientation of all these components. These sensors c an measure thousands of points per seconds The transmitted laser pulse from the aircraft partially reflected from the water surface and the seabed back to the receiver. By recording the time taken from the laser to reach the surface and back to the receiver and speed of the light in air and in water, the distance to the sea surface and sea bed can be calculated. This information is used to calculate the water depth. The bathymetric LIDAR system also includes RGB cameras which acquire better color photo which is used as a quality check tool in identification of bathymetric features and aids to navigation. Airborne LIDAR bathymetry has various  Ã‚   advantages over other traditional water borne surveying techniques. It has tendency to perform survey quickly, efficiently within small operational window. This can cover a very large area and all those areas where it would be difficult to survey using traditional surveying methods. The ability of the airborne LIDAR to operate from the air gives the surveyor a flexibility that sur vey vessel surveyors could hardly imagine. The modern airborne LIDAR now comes with oblique digital photography which can be merged with point cloud. These georeferenced images are used during the validation process. There are numerous limitations of an airborne LIDAR bathymetry system. The maximum depth the laser can penetrate depends on the clarity of water. The maximum surveyable depths depend on several systems used and the environment condition. The green laser penetrates and travel maximum depth if the water is clear water. The maximum surveyable depths ranges from 50 meters in clean water to less than 10 meters in murky water. The use of airborne LIDAR system is not appropriate for small target detection. The spatial resolution obtained from the airborne LIDAR is not as good as for modern high frequency sonar. Small target detection using airborne LIDAR may be possible by significantly increasing the survey density which becomes more expensive. Various environmental factors like rain, fog, clouds, high winds, high waves, etc. can cause problem when carrying airborne LIDAR survey. Surveying in rain cause laser beam to backscatter to the receiver bye raindrops. The backscatter signal by the mist, fog can result in false surface heights.   Airborne survey in high wind can pose a danger when flying near a coastal mountain and cause changes in survey density. Airborne LIDAR bathymetry technology can be used for many applications like charting, environmental mapping, flood plain and coastal mapping etc. https://www.gim-international.com/content/article/technology-in-focus-bathymetric-LIDAR-2

Public Education Essay -- A Level Essays

Public Education Education is an issue that touches everyone’s lives in one way or another. Whether you are a parent, student, teacher, taxpayer, or employee, the effects of education on society can be seen everyday. For this reason, public schools are a top concern among political leaders. Over the past twenty-five years, confidence in the nation’s public school system has dramatically declined. While the public for the most part seems to support their school district, criticism is not lacking. Recent years especially have shown dissipating support. It appears that the prevailing view is that public education, as a whole, is in bad condition and is in need of a renewed effort to fix it. Private schools seem to fare better opinions than public schools in important areas such as safety, order, academic standards, and class size. Today’s Congress is looking for the correct answer to a very diverse and complex problem. In 2001, Congress approved President Bush’s education reform bill, otherwise known as the No Child Left Behind Act. This bill acts to provide local districts with increased flexibility in spending federal aid. It also requires annual standardized math and reading tests. Many of the issues addressed within the bill follow conservative ideology. However, the bill was a collaborative effort, between both democrats and republicans, to try to deal with America’s education problems in the most effective way possible. We will continue to discuss the major significant points of this legislation later on. Currently, Congress has turned its attention to special education. While the program is good because it helps the children in need, critics argue that it provides... ...a moderate may believe that the answer to America’s educational system lies within the need to raise educational standards and increase school funding. Because the No Child Left Behind Act was a compromise between Liberals and Conservatives, it is likely that most Moderates would agree with most of the ideas set out in the bill. However, being that there is no set model for the moderate perspective on education, a moderate can disagree on any number of resolutions within the act. Sources Cited: www.publicagenda.com http://www.ed.gov/nclb/landing.jhtml http://www.house.gov/georgemiller/rel5200.html http://www.senate.gov/~feinstein/releases01/education_reform.html http://www.cato.org/dailys/01-11-02.html http://www.cnn.com/2003/ALLPOLITICS/02/03/bush.budget/index.html http://www.house.gov/budget_democrats/news/bush_ed_june1003.htm Public Education Essay -- A Level Essays Public Education Education is an issue that touches everyone’s lives in one way or another. Whether you are a parent, student, teacher, taxpayer, or employee, the effects of education on society can be seen everyday. For this reason, public schools are a top concern among political leaders. Over the past twenty-five years, confidence in the nation’s public school system has dramatically declined. While the public for the most part seems to support their school district, criticism is not lacking. Recent years especially have shown dissipating support. It appears that the prevailing view is that public education, as a whole, is in bad condition and is in need of a renewed effort to fix it. Private schools seem to fare better opinions than public schools in important areas such as safety, order, academic standards, and class size. Today’s Congress is looking for the correct answer to a very diverse and complex problem. In 2001, Congress approved President Bush’s education reform bill, otherwise known as the No Child Left Behind Act. This bill acts to provide local districts with increased flexibility in spending federal aid. It also requires annual standardized math and reading tests. Many of the issues addressed within the bill follow conservative ideology. However, the bill was a collaborative effort, between both democrats and republicans, to try to deal with America’s education problems in the most effective way possible. We will continue to discuss the major significant points of this legislation later on. Currently, Congress has turned its attention to special education. While the program is good because it helps the children in need, critics argue that it provides... ...a moderate may believe that the answer to America’s educational system lies within the need to raise educational standards and increase school funding. Because the No Child Left Behind Act was a compromise between Liberals and Conservatives, it is likely that most Moderates would agree with most of the ideas set out in the bill. However, being that there is no set model for the moderate perspective on education, a moderate can disagree on any number of resolutions within the act. Sources Cited: www.publicagenda.com http://www.ed.gov/nclb/landing.jhtml http://www.house.gov/georgemiller/rel5200.html http://www.senate.gov/~feinstein/releases01/education_reform.html http://www.cato.org/dailys/01-11-02.html http://www.cnn.com/2003/ALLPOLITICS/02/03/bush.budget/index.html http://www.house.gov/budget_democrats/news/bush_ed_june1003.htm

Kahirapan

Smoke From Wikipedia, the free encyclopedia For other uses, see Smoke (disambiguation). Smoke from a bee smoker, used inbeekeeping the smoke of burning tungsten in alightbulb Smoke is a collection of airborne solid and liquid particulates and gases[l] emitted when a material undergoes combustion or pyrolysis, together with the quantity of air that is entrained or otherwise mixed into the mass.It is commonly an unwanted by- product of fires (including stoves, candles, oil lamps, and fireplaces), but may also be used for pest control (fumigation), communication (smoke signals), defensive and ffensive capabilities in the military (smoke-screen), cooking (smoked salmon), or smoking (tobacco, cannabis, etc. ). Smoke is used in rituals, when incense, sage, or resin is burned to produce a smell for spiritual purposes. Smoke is sometimes used as a flavoring agent, and preservative for various foodstuffs.Smoke is also a component of internal combustion engine exhaust gas, particularly diesel exhaust. Smoke inhalation is the primary cause of death in victims of indoor fires. The smoke kills by a combination of thermal damage, poisoning andpulmonary irritation caused y carbon monoxide, hydrogen cyanide and other combustion products. Smoke particles are an aerosol (or mist) of solid particles and liquid droplets that are close to the ideal range of sizes for Mie scattering of visible light.This effect has been likened to three-dimensional textured privacy glass[citation needed] † a smoke cloud does not obstruct an image, but thoroughly scrambles it. Contents [hide] 1 Chemical composition 1. 1 Visible and invisible particles of combustion 2 Dangers of smoke 2. 1 Smoke corrosion 3 Secondhand smoke inhalation 4 Measurement of smoke 5 Medicinal smoke 6 See also 7 References External links Chemical composition[edit] This section needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. April 2011) The composition of smoke depends on the nature of the burn at a high temperature and with small amount of smoke produced; the particles are mostly composed of ash, or with large temperature differences, of condensed aerosol of water. High temperature also leads to production of nitrogen oxides. Sulfur content yields sulfur dioxide, or in case of incomplete combustion, hydrogen sulfide. Carbon and hydrogen are almost completely oxidized to carbon dioxide and water. Fires burning with lack of oxygen produce a significantly wider palette of compounds, many of them toxic.Partial oxidation of carbon produces carbon monoxide, nitrogen- containing materials can yield hydrogen cyanide, ammonia, and nitrogen oxides. Hydrogen gas can be produced instead of water. Content of halogens such as chlorine (e. g. in polyvinyl chloride or brominated flame retardants) may lead to production of e. g. hydrogen chloride, phosgene,dioxin, and chloromethane, bromomethane and other halocarbons. Hydrogen fluoride can e formed from fluorocarbons, whether fluoropolymers subjected to fire or halocarbon fire suppression agents. 2] Phosphorus and antimony oxides and their reaction products can be formed from some fire retardant additives, increasing smoke toxicity and corrosivity. Pyrolysis of polychlorinated biphenyls (PCB), e. g. from burning older transformer oil, and to lower degree also of other chlorine-containing materials, can produce a potent carcinogen, and other polychlorinated dibenzodioxins. Pyrolysis of fluoropolymers, e. g. teflon, in presence of oxygen yields carbonyl fluoride (which hydrolyzes readily to HF and C02); ther compounds may be formed as well, e. g. arbon tetrafluoride, hexafluoropropylene, and highly toxic perfluoroisobutene Emission of soot from a large dieseltruck, without particle filters. Pyrolysis of burning material, especially incomplete combustion or smoldering without adequate oxygen supply, also results in production of a large amount of hydrocarbons, both aliphatic (methane, ethane, ethylene, acetylene) and aromatic (benzene and its derivates, polycyclic aromatic hydrocarbons; e. g. benzo[a]pyrene, studied as a carcinogen, or retene), terpenes. Heterocyclic compounds may be also present.Heavier hydrocarbons may condense as tar; smoke with significant tar content is yellow to brown. Presence of such smoke, soot, and/or brown oily deposits during a fire indicates a possible hazardous situation, as the atmosphere may be saturated with combustible pyrolysis products with concentration above the upper flammability limit, and sudden inrush of air can cause flashover or backdraft. Presence of sulfur can lead to formation of e. g. hydrogen sulfide, carbonyl sulfide, sulfur dioxide, carbon disulfide, and thiols; especially thiols tend to get adsorbed on surfaces and produce a ingering odor even long after the fire.Partial oxidation of the released hydrocarbons yields in a wide palette of other compound s: aldehydes (e. g. formaldehyde, acrolein, and furfural), ketones, alcohols (often aromatic, e. g. phenol, guaiacol, syringol, catechol, and cresols), carboxylic acids (formic acid, acetic acid, etc. ). The visible particulate matter in such smokes is most commonly composed of carbon (soot). Other particulates may be composed of drops of condensed tar, or solid particles of ash. The presence of metals in the fuel yields e. g. ammonium sulfate, ammonium nitrate, or sodium chloride.Inorganic salts present on the surface of the soot particles may make themhydrophilic. Many organic compounds, typically the aromatic hydrocarbons, may be also adsorbed on the surface of the solid particles. Metal oxides can be present when metal-containing fuels are burned, e. g. solid rocket fuels containing aluminium. Depleted uranium projectiles after impacting the target ignite, producing particles of uranium oxides. Magnetic particles, spherules of magnetite-like ferrous ferric oxide, are present in coal smoke; their increase in deposits after 1860 marks the beginning of the Industrial Revolution. ] (Magnetic iron oxide nanoparticles can be also produced in the smoke from meteorites burning in the atmosphere. ) [5] Magnetic remanence, recorded in the iron oxide particles, indicates the strength of Earth's magnetic field when they were cooled beyond their Curie temperature; this can be used to distinguish magnetic particles of terrestrial and meteoric origin. [6] Fly ash is composed mainly of silicaand calcium oxide. Cenospheres are present in smoke from liquid hydrocarbon fuels. Minute metal particles produced by abrasion can be present in engine smokes.Amorphous silica particles are present n smokes from burning silicones; small proportion of silicon nitride particles can be formed in fires with insufficient oxygen. The silica particles have about 10 nm size, clumped to 70-100 nm aggregates and further agglomerated to chains. [3] Radioactive particles may be present due to tra ces of uranium, thorium, or other radionuclides in the fuel; hot particles can be present in case of fires during nuclear accidents (e. g. Chernobyl disaster) or nuclear war. Smoke particulates have three modes of particle size distribution: nuclei mode, with geometric mean radius between 2. 20 nm, likely forming by condensation of carbon moieties. accumulation mode, ranging between 75-250 nm and formed by coagulation of nuclei mode particles coarse mode, with particles in micrometer range Most of the smoke material is primarily in coarse particles. Those undergo rapid dry precipitation, and the smoke damage in more distant areas outside of the room where the fire occurs is therefore primarily mediated by the smaller particles. [7] Aerosol of particles beyond visible size is an early indicator of materials in a preignition stage of a fire. 3] Burning of hydrogen-rich fuel produces water; this esults in smoke containing droplets of water vapor. In absence of other color sources (nitr ogen oxides, particulates†¦ ), such smoke is white and cloud-like. Smoke emissions may contain characteristic trace elements. Vanadium is present in emissions from oil fired power plants and refineries; oil plants also emit some nickel. Coal combustionproduces emissions containing aluminium, arsenic, chromium, cobalt, copper, iron, mercury, sel enium, and uranium. Traces of vanadium in high-temperature combustion products form droplets of molten vanadates.These attack the passivation layers on metals and ause high temperature corrosion, which is a concern especially for internal combustion engines. Molten sulfate and lead particulates also have such effect. Some components of smoke are characteristic of the combustion source. Guaiacol and its derivatives are products of pyrolysis of lignin and are characteristic of wood smoke; other markers aresyringol and derivates, and of forest fires. Levoglucosan is a pyrolysis product of cellulose. Hardwood vssoftwood smokes differ in the ratio of guaiacols/syringols.Markers for vehicle exhaust include polycyclic aromatic hydrocarbons, hopanes, steranes, and specific nitroarenes (e. . I-nitropyrene). The ratio of hopanes and steranes to elemental carbon can be used to distinguish between emissions of gasoline and diesel engines. [8] Many compounds can be associated with particulates; whether by being adsorbed on their surfaces, or by being dissolved in liquid droplets. Hydrogen chloride is well absorbed in the soot particles. [7] Inert particulate matter can be disturbed and entrained into the smoke. Of particular concern are particles of asbestos.Deposited hot particles of radioactive fallout and bioaccumulated radioisotopes can be reintroduced into the atmosphere y wildfires and forest fires; this is a concern in e. g. the Zone of alienationcontaining contaminants from the Chernobyl disaster. Polymers are a significant source of smoke. Aromatic side groups, e. g. in polystyrene, enhance generation of smoke. Aromati c groups integrated in the polymer backbone produce less smoke, likely due to significant charring. Aliphatic polymers tend to generate the least smoke, and are non-self-extinguishing.However presence of additives can significantly increase smoke formation. phosphorus-based and halogen-based flame retardants decrease production of smoke. Higher degree of cross-linking between the polymer chains has such effect too. [9] Visible and invisible particles of combustion[edit] Smoke from a wildfire Depending on particle size, smoke can be visible or invisible to the naked eye. This is best illustrated when toasting bread in a toaster. As the bread heats up, the products of combustion increase in size. The particles produced initially are invisible but become visible if the toast is burned or cooled rapidly.Smoke from a typical house fire contains hundreds of different chemicals and fumes. As a result, the damage aused by the smoke can often exceed that caused by the actual heat of the fire . In addition to the physical damage caused by the smoke of a fire – which manifests itself in the form of stains – is the often even harder to eliminate problem of a smoky odor. Just as there are contractors that specialize in rebuilding/repairing homes that have been damaged by fire and smoke, fabric restoration companies specialize in restoring fabrics that have been damaged in a fire.Dangers of smoke[edit] Smoke from oxygen-deprived fires contains a significant concentration of compounds that are flammable. A cloud of smoke, in contact with atmospheric oxygen, therefore has the potential of being ignited – either by another open flame in the area, or by its own temperature. This leads to effects like backdraft and flashover. Smoke inhalation is also a danger of smoke that can cause serious injury and death. Many compounds of smoke from fires are highly toxic and/or irritating. The most dangerous is carbon monoxide leading to carbon monoxide poisoning, someti mes with the additive effects ofhydrogen cyanide and phosgene.Smoke inhalation can therefore quickly lead to incapacitation and loss of consciousness. Sulfur oxides, hydrogen chloride nd hydrogen fluoride in contact with moisture and materials. When asleep the nose does not sense smoke nor does the brain, but the body will wake up if the lungs become enveloped in smoke and the brain will be stimulated and the person will be awoken. This does not work if the person is incapacitated or under the influence of Drugs and/or alcohol Cigarette smoke is a major modifiable risk factor for lung disease, heart disease, and many cancers.Reduced visibility due to wildfire smoke in Sheremetyevo airport (Moscow, Russia) 7 August 2010. Smoke can obscure visibility, impeding occupant exiting from fire areas. In fact, the poor visibility due to the smoke that was in the Worcester Cold Storage Warehouse fire in Worcester, Massachusetts was the exact reason why the trapped rescue firefighters couldn't evacuate the building in time. Because of the striking similarity that each floor shared, the dense smoke caused the firefighters to become disoriented. 10] Smoke corrosion[edit] Smoke contains a wide variety of chemicals, many of them aggressive in nature. Examples are hydrochloric acid and hydrobromic acid, produced fromhalogen- containing plastics and fire retardants, hydrofluoric acid released y pyrolysis of fluorocarbon fire suppression agents, sulfuric acid from burning of sulfur-containing materials, nitric acid from high-temperature fires where nitrous oxide gets formed, phosphoric acid and antimonycompounds from P and Sb based fire retardants, and many others.Such corrosion is not significant for structural materials, but delicate structures, especially microelectronics, are strongly affected. Corrosion of circuit board traces, penetration of aggressive chemicals through the casings of parts, and other effects can cause an immediate or gradual deterioration f parameters or even premature (and often delayed, as the corrosion can progress over long time) failure of equipment subjected to smoke.Many smoke components are also electrically conductive; deposition of a conductive layer on the circuits can cause crosstalks and other deteriorations of the operating parameters or even cause short circuits and total failures. Electrical contacts can be affected by corrosion of surfaces, and by deposition of soot and other conductive particles or nonconductive layers on or across the contacts. Deposited particles may adversely affect the erformance of optoelectronics by absorbing or scattering the light beams.Corrosivity of smoke produced by materials is characterized by the corrosion index (C'), defined as material loss rate (angstrom/minute) per amount of material gasified products (grams) per volume of air (m3). It is measured by exposing strips of metal to flow of combustion products in a test tunnel. Polymers containing halogen and hydrogen (polyvinyl chlori de, polyolefins with halogenated additives, etc. ) have the highest Cl as the corrosive acids are formed directly with water produced by the combustion, polymers containing halogen only (e. polytetrafluoroethylene) have lower Cl as the formation of acid is limited to reactions with airborne humidity, and halogen-free materials (polyolefins, wood) have the lowest Cl. [7] However, some halogen-free materials can also release significant amount of corrosive products. [11] Smoke damage to electronic equipment can be significantly more extensive than the fire itself. Cable fires are of special concern; low smoke zero halogen materials are any substance or structure, the chemicals contained in it are transferred to it.The corrosive properties of the chemicals cause the substance or structure to decompose t a rapid rate. In some instances the chemicals are absorbed into the substance or structure that it comes into contact with, i. e. clothing, unsealed surfaces, potable water piping, wood , etc. , which is why in most cases dealing with a structure fire they are replaced. Secondhand smoke inhalation[edit] Secondhand smoke is the combination of both sidestream and mainstream smoke emissions. These emissions contain more than 50 carcinogenic chemicals.According to the Surgeon General's latest report on the subject, â€Å"Short exposures to secondhand smoke can cause blood platelets to become stickier, damage the lining f blood vessels, decrease coronary flow velocity reserves, and reduce heart variability, potentially increasing the risk of a heart attack† [12] The American Cancer Society lists â€Å"heart disease, lung infections, increased asthma attacks, middle ear infections, and low birth weight† as ramifications of smoker's emission [13] Measurement of smoke[edit] As early as the 1 5th Century Leonardo da Vinci commented at length on the difficulty of assessing smoke, and distinguished between black smoke (carbonized particles) and white ‘smok e' which is not a smoke at all but merely a suspension of harmless ater droplets. Smoke from heating appliances is commonly measured in one of the following ways: In-line capture. A smoke sample is simply sucked through a filter which is weighed before and after the test and the mass of smoke found. This is the simplest and probably the most accurate method, but can only be used where the smoke concentration is slight, as the filter can quickly become blocked. Filter/dilution tunnel.A smoke sample is drawn through a tube where it is diluted with air, the resulting smoke/air mixture is then pulled through a filter and weighed. This is the nternationally recognized method of measuring smoke from combustion. Electrostatic precipitation. The smoke is passed through an array of metal tubes which contain suspended wires. A (huge) electrical potential is applied across the tubes and wires so that the smoke particles become charged and are attracted to the sides of the tubes. This method ca n over-read by capturing harmless condensates, or under-read due to the insulating effect of the smoke. However, it is the necessary method for assessing volumes of smoke too great to be forced through a filter, i. . , from bituminous coal. [14] Ringelmann scale. A measure of smoke color. Invented by Professor Maximilian Ringelmann in Paris in 1888, it is essentially a card with squares of black, white and shades of gray which is held up and the comparative grayness of the smoke Judged. Highly dependent on light conditions and the skill of the observer it allocates a grayness number from O (white) to 5 (black) which has only a passing relationship to the actual quantity of smoke. Nonetheless, the simplicity of the Ringelmann scale means that it has been adopted as a standard in many countries. Optical scattering. A light beam is passed through the smoke.A light detector is situated at an angle to the light source, typically at 900, so that it receives only light reflected from passi ng particles. A measurement is made of the light received which will be lower as the concentration of smoke particles becomes higher. Optical obscuration. A light beam is passed through the smoke and a detector opposite light will be measured. Combined optical methods. There are various proprietary optical smoke measurement devices such as the ‘nephelometer' or the ‘aethalometer' which use several different optical methods, including more than one wavelength of ight, inside a single instrument and apply an algorithm to give a good estimate of smoke. Inference from carbon monoxide.Smoke is incompletely burned fuel, carbon monoxide is incompletely burned carbon, therefore it has long been assumed that measurement of CO in flue gas (a cheap, simple and very accurate procedure) will provide a good indication of the levels of smoke. Indeed, several Jurisdictions use CO measurement as the basis of smoke control. However it is far from clear how accurate the correspondence is. Medicinal smoke[edit] Throughout recorded history, humans have used the smoke of medicinal plants to cure illness. A sculpture from Persepolis shows Darius the Great (522-486 SC), the king of Persia, with twocensers in front of him for burning Peganum harmala and/ or sandalwood Santalum album, which was believed to protect the king from evil and disease. More than 300 plant species in 5 continents are used in smoke form for different diseases.As a method of drug administration, smoking is important as it is a simple, inexpensive, but very effective method of extracting particles containing active agents. More importantly, generating smoke reduces the particle size to a microscopic scale thereby increasing the absorption of its active chemical principles. 1 5] see alsocedit] Wikimedia Commons has media related to Smoke.

Nutrition Carabao’s Milk Essay

Carabao’s milk contains protein, fat, lactose, vitamins, minerals and water making it the â€Å"most complete food†, according to the Philippine Carabao Center (PCC). Carabao’s milk is richer and creamier compared to goat’s and cow’s milk due to its high content of milk fat which is a good source of energy that unknowingly among Filipinos, this dairy product produced by carabao could be the solution to the alarming malnutrition problem among their children, it said in a statement reaching here over the week. The Senate Economic Planning Office (SEPO) estimates that today, the number of underweight children is about eight million, up tremendously from 6. 68 million in 2001. Of the 2001 SEPO figure on Filipino children’s malnutrition, 3. 67 million of these kids belonged to the five years old and below bracket and 3. 07 were aged between six and 10 years old. The PCC said that the carabao’s milk can be of great help in eradicating malnutrition. â€Å"Nutrient-wise, it is better compared with the array of cola and other commercial drinks in the market. In drinking carabao’s milk, we are not only getting the needed nutrients for our bodies but we are also supporting our local dairy industry. † Nutritionists claim it contains riboflavin or vitamin B2 needed for normal growth, the agent against skin swelling, inflammation of the lining of mouth and tongue, and dizziness. Its vitamin A content is good for clearing eyesight while the vitamin D, calcium and phosphorus are valuable for strong teeth and bones. Like most fresh milk, carabao’s milk also spoils easily. As such, the PCC recommends three steps to maintain the freshness of carabao’s milk. The first thing to do is to store the fresh milk inside an ice box or refrigerator immediately after milking. Then, the fresh milk must be pasteurized or cooked to kill the microbes and for it to be safe to drink. Finally, it must be stored properly. If not consumed completely, fresh milk must be stored in an ice box or refrigerator to control the spread of microbes that are not killed during the pasteurization process. Carabao’s milk can also be processed into chocolate-flavored milk, pastilles de leche or milk candy, kesong puti (white cheese), milk-o-jel, condensed milk, cheese spread, ice cream, mozzarella, or rennet (coagulated milk).