Green Energy Means Renewable Energy Environmental Sciences Essay

Green Energy Means Renewable Energy Environmental Sciences Essay Green energy means renewable energy that is vast alternative for the use of fossil fuels such as petroleum. Other conventional method used to provide electricity is such as geothermal, biomass, ocean, solar, wind, hydro, hydrogen fuel cells and etc. Biomass energy is derived from the wastes and animal dung either by burning it or just leaving the wastes to lay off by itself to get biofuel or biogas. Ocean energy is gained from the sea and there are two types of them such as thermal energy and mechanical energy. Hydrogen must go through reformation process or electrolysis process to be able to use for the fuel cells to provide electricity. The objective of the project is to choose seven types of renewable energies and explain its applications and advantages in detail. 1. Introduction Green energy is sustainable energy, which means meeting the needs of the present without compromising the future[2]. These alternative energy sources are said to be not harmful to humans and environment and also arenon polluting energy sources. It basically reduces pollution and the impact on the environment that the existing energy source is causing now and in the past by conventional energy sources such as fossil fuel, coal and wood. These are non renewable energy sources, also known as the brown energy[1]. These sources are mainly used in the production of electricity, heating and fuel for boilers. They cause excessive amount of pollutants, such as carbon monoxide and nitrogen oxides, together with particles that could harm humans. These pollutants are the main contributors to the greenhouse gases that cause global warning. Brown energy are also types of sources that are typically reducing on our earth, which means it could not be re-produced to be used in future. The main aim for this study on green energy is to literate the reader on what is green energy and the importance of these energy to substitute our current conventional energy resources. These report is also to identify the main types of green energies available for the current technology practised in our world today with the history of energy development that brought to the practice of green energy. 2. Green Energy Sources of green energy come from the nature itself, being free to be harvested. They are mainly derived from the sun (solar power), wind and water. Wind turbines have been used since old times to grind grains, where the term windmill is derived from. A more expensive source would come from nuclear and bioenergy (biofuel and biogas). Nuclear power is also categorized in green energy as it does not produce greenhouse gases. Waste from nuclear power plants are problematic and dangerous to be handled as it takes hundreds to thousands of years to decay before reaching the level that is not harmful to humans, plants and the animals. But in order to completely wipe out the usage of fossil fuels to produce electricity, the number of nuclear plants has to be increased so that greenhouse gases emissions can be cut down massively.[3] Energy from sun, wind and water are continuous but inconsistent. Rainy days that could affect solar power production and droughts that would affect water levels in dams are the main drawbacks of these energy sources. As renewable energy is sometimes inconsistent, excellent storage capacity is needed to store energy that are produced. It is usually windier in the night time, but the demand would be lesser. Nuclear plants generate so much power at a particular time that they cannot be used at once. So large battery banks are required in order to mesh with the electricity system and provide a consistent power supply. 2.1 History of Energy Development The history of energy consumption of human being dates back to 3000 BC where the Mesopotamians used petroleum to caulk ships and to build roads. Coals were used during the Bronze Age to heat up iron and shape them, as well as in the Roman culture. This long history of non-renewable energy usage has urged the emergence of green energy to replace them in order to keep the future generation safe.[4] 2000 B.C. Crude oil was used to light lamps and heat up homes by the Chinese. 200 B.C. Salt produced from brine using natural gas from underground by Chinese. 600 B.C. Static Electricity found by Thales of Miletus by rubbing amber. 250 400 A.D. First water-powered Mills built by the Romans 600 A.D. Greek Fire was invented by the Persians and Arabs, a form of burning liquid used greatly in the Byzantine Empire as weapon. 500 900 A.D Windmills were built to pump water and grind grains by the Persians. Late 1500s Coal was imported greatly by US, up to 108,000 tons until the 1800s. 1700s A kite that transmitted electricity through its wet cord was found by Ben Franklin. A breakthrough in electricity discovery. 1800-1826 US had the first electric utility. Mid 1800s-1950 Wood as the primary source of fuel, but decreased after the shift back to coal. 1870-1880 Gas and alcohol using first combustion engine. First U.S. power plant to produce electricity opened (Thomas Edisons Pearl Street Station) 1888 First wind turbine generating electricity in Cleveland, Ohio. Early 1900s Geothermal used to produce electricity commercially by the Italians 1938 Nuclear Fission discovered by the Germans. 1940-1950 The Atomic Energy Act implementation and the first electricity were produced by using nuclear power. 1950s First silicon solar cell was invented (solar photovoltaic). 1960s National Environmental Policy Act and Clean Air Act in US implementation to protect the environment and reduce pollution. 1970s Department of Energy (DOE) were formed. Water from power plant was controlled with Clean Water Act in 1972. 1974 Development of renewable energy was initiated and supported by the National Renewable Energy Laboratory. 1980s First wind farm built in the United States.2.2 Giga watts of power produced in California. 1990s Natural gas was used in almost 50percent of homes in US for heating. Towards the Greener Solution Till 2007, 24 states adopted policies for increasing the production of renewable energy. 2.2 Importance of Green Energy Research from scientific evidence are showing that what this present generation is doing will impact the environment in the next 50 100 years. The fact that only one earth is known by human being urges government and private sectors to find solutions to reduce pollution and having a lifestyle that is more eco-friendly. A few reasons on why green energy is important. Non renewable fossil fuels burning are causing greenhouse gases that cause global warming. Carbon dioxide, methane and nitrogen oxides are released into the atmosphere, dissolving into raindrops and causing acid rains. Acid rains damages crops, plants and forests. Aquatic organisms are also affected by this as lakes and rivers pH levels are altered. Human built structures such as steel bridges, marble statues and limestone buildings are being eroded by acid rain.[10] Figure 3 is a pie chart showing the anthropogenic greenhouse gas emissions in the U.S. by gas type. Fossil fuels such as oil and coal are also supply that is not endless. Sooner or later the supply will vanish and unavailable for future generations. Wind, water and solar energy are constant, sustainable and 100 percent clean energy. It does not cause negative impact on environment such as pollutant and waste. This energy type is free as well. Humans would benefits in health as reduced pollutants would provide cleaner and more breathable air. Lands would be saved as waste management is not necessary. Cleaner water for domestic usage and aquatic organism a would be available. Jobs opportunity would arise in rural areas as most renewable energy plants are located far from cities. Regional development also would benefit from this.[8][9] 3. Types of Green Energy 3.1 Biomass Biomass is derived from farm wastes, animal wastes, plant oils, crops and some kind of garbage [11]. Energy that is generated from the wastes is called bio power or bioenergy [11]. Biomass can be processed further to obtain biofuels or burned directly to obtain bioenergy[11]. The energy obtained from burning the wastes can be converted into heat, electricity and mechanical energy [1]. 3.1.1 Types of biofuels Solid form its obtained from the burning of organic material such as animal wastes, wood, grain and other types of garbages [11]. Liquid form- its obtained straight from the plant and does not involves any burning of material [1]. Biodiesel can be taken as an example for this type of form. It is extracted from vegetable oils or animal fats [11]. Gas form its obtained from organic waste such as dead plant and animal wastes when the organic material breakdown naturally without the need of oxygen [12]. Biogases consist of methane that is essential in terms of natural gas [12]. 3.1.2 Application of biomass Widely used in transportation in the form of gases Electricity generation plants Gas produced from the biomass gasifier must be cleaned first before cooling it down and use it as a fuel to run an IC engine that is coupled together with the generator [13]. Heat application Biomass is used as a fuel to provide energy for the fuel-fired furnace that is often used for high end outputs such as[13 ]: Forging furnace Ovens Kilns Dryers Small boilers Direct fire process heater Re-rolling mills 3.1.3 Benefits of biomass energy Biogases that are used as fuels gives more mileage for cheaper price compared to fossil fuels Energy from biomass has got no ending to it since human throw wastes in daily basis and animals also constantly produce muck Energy gained from burning the wastes releases carbon dioxide to the atmosphere and the carbon dioxide that is released from the burning is useful for the plants in terms of photosynthesis process. Each country has their wastes in terms of plants, animals dung and garbages, these materials is available locally. This can reduce the need for foreign investors in the country thus improve the nation economically as well Biomass in mass production can reduce the increase in global temperature significantly. 3.2 Ocean energy Ocean energy is gained from the sea. There are two types of energy gained from the ocean such as thermal energy and mechanical energy [15]. Thermal energy is gained by the difference in temperature between the warmer surface of the ocean and the deep cold ocean water [15]. Mechanical energy is gained from tidal and wave that is used to rotate the turbine to provide electricity in most of the power plants available [15]. 3.2.1 Types of energy gained 3.2.2 Thermal energy The difference between the temperatures should be around 38 Degree Fahrenheit in order to build a power plant that can fully utilize this temperature difference to make energy [16]. There are 3 types of cycles involved in electricity conversion system from the heat energy such as: Closed cycle The heat at the surface of the ocean water is used to vaporize an ammonia type of fluid which has low boiling point and the vapor expands to turn the turbine to produce electricity [15]. Open cycle The sea water in this case is kept at low pressure in order to force it to boil at low temperature and the steam produced from the sea water is then used to rotate the turbine to activate the generator to produce electricity[15]. Hybrid The combination of both open and closed cycles is used to rotate the turbine in a most economical way [15] 3.2.3 Mechanical energy Tidal energy its gained as the earth rotates and the gravitational pull of the moon. The principle of tidal energy is when the tides is at high point the water is trapped in the dam and as the tides began to reach the low point, the trapped water is released to rotate the turbine at high speed to generate electricity[15]. The concept is similar to hydroelectric power plants [6]. Wave energy Existing kinetic energy from the movement of the waves is used to power up the turbine [15]. The concept is simple that the waves from the ocean comes into the chamber from the right, as the rise of the waves will force the air to release from the chamber and the released air is the one that will rotate the turbine to provide electricity as shown in the figure 1 below[16]. The higher the waves, higher are the rotation of the turbine. http://www.energyquest.ca.gov/story_old/images/chap14_wave_2007.gif Application of wave energy [16] 3.3 Hydrogen and fuel cells energy Hydrogen best identified as the simplest component [18]. One proton and one electron are the sub elements inside an atom of hydrogen [18]. It has a limitation is that it doesnt appear by its own in the earth. Hydrogen atom always combined together with other elements such as water [17][18]. The molecular weight of hydrogen is 1kmol and the lightest weigh among all the other natural components available in earth. Hydrogen can be separated from hydrocarbon by heating process and this is called reformation process [18]. Electric current also used to separate hydrogen from water and the separation process is called electrolysis [18]. Fuel cells function is to convert hydrogen to electricity directly without any other processes in between [18]. Reformation of methanol, gasoline and natural gas can provide hydrogen for the usage of fuel cells [18]. Methanol can be used directly for some fuel cells without any reformation process [18]. 3.3.1 Applications of hydrogen and fuel cells NASA used liquid nitrogen as a fuel for the space shuttles and other rockets. Liquid nitrogen does not emit any harmful material after the combustion [18]. The product of the conversion by hydrogen fuel cells is pure water that is used as drinking water by the astronauts [18]. Hydrogen powered vehicles is among the growing applications of energy since hydrogen fuel cells capable of providing power for buses[21]. Fuel cells also can provide electricity for a residential housing area that is big as a traditional AC unit [21]. It can operate 24 hours a day and 7 days a week. 3.3.2 Advantages of fuel cells Efficient conversion of energy from hydrogen to electricity without any combustion taking place and the byproduct is water[19][20] The noise level created from an operation of a fuel cell relatively much more quiet than the conventional motors[20] Easier maintenance since less moving parts[20] Life span is longer than a battery since it has no memory effect when its refueled[10] The source for fuel cells are hydrogen and it is available with water[20] Can reduce the nations usage of fossil fuels since fossil fuels come at higher price than hydrogen that is naturally available in the earth [20]. 3.4 Geothermal Energy Geothermal energy is a form of thermal energy stored by generation of heat from radioactive decay of minerals occurring inside the earth (80 percent) and from the original formation of the planet (20 percent).[6] Due to the temperature differences between the earth core and surface, continuous heat transfer occurs from the core to surface. Radioactive decaying of natural materials such as uranium and potassium that occurs at the core creates a temperature reaching over 5000 degree Celsius and very high pressure.[7] This high temperature and pressure causes melting of surrounding cooler rocks and these results in the formation of magma. This magma then heats up the rocks and water in the crust which can go up tp 370 degree Celsius.[6] In the range of 10kilometers of earth surface contains heat energy that is 50000 times more than all the oil and natural gas sources in the world.[7] The typical place that usually spots geothermal activities is regions with active volcanic activities. T his usually occurs at places where the earth crust is thin enough to let the heat out. Earthquake and magma movements breaks up the rocks covering and allows water to circulate, producing natural hot springs and geysers as the heated up water reaches the surface. As these hot and pressured water forms a reservoir type of containment underground, wells are usually constructed to harvest electricity or heat. 3.4.1 Applications Steam produced from the reservoir containing pressured and hot water are usually used to power turbines in power plants that generates electricity (Steam Turbine), while other power plants uses the hot water in the reservoir to boil a working fluid that vaporizes and moves a turbine. Heat produced by hot water near to the earth surface can be directly used for heating purpose. The applications that utilizes these direct heat includes heating buildings and homes purpose, growing plants in greenhouses, drying crops, heating water at fish farms, and also in pasteurizing milk processes at milk industries. This is done by using geothermal heat pumps. There is also formation of hot dry rocks, usually 4-10kilometers from earth surface. Technologies is existing to inject cold water onto these hot dry rocks, circulating them through the cracks of the rocks and drawing back the heat from another well located at the end of the water circuit.[5] http://www.bbc.co.uk/schools/gcsebitesize/science/images/131_geothermal_energy.gif Water pumped down through injection well and collected at production well. http://www.ucsusa.org/assets/images/ce/geopower3.gif How geothermal heat used to power turbines. 3.5 Hydropower Hydro means water, so hydropower basically is the power that derived from the force of moving water and generates electricity at damn by water falling throughout the turbines. [22] The fall of water and movement is part of a constant ordinary cycle known as water cycle. Water in the earths ocean and rivers evaporates by energy from the sun and draws it ascendant as water vapour. Once the water vapour reached the cooler air in atmosphere, it automatically abbreviates and forms as clouds. [23] Hence, the moisture fall to earth as rain and fill the water in oceans and rivers. The moving of water from higher ground to the lower ground with the gravitational force and it drives the water extremely powerful to assist generates electricity for daily usage of human being.[23] Hydropower is a one of the worlds biggest source of renewable energy and play important role or facing challenges during period of climate vary. [24] Hydropower also is considering clean energy source because it does no t release any toxins to damage the environment. [25] Figure 3.1: Water cycle diagram 3.5.1 Types of Hydropower Hydropower is primarily used to generate electricity. There are few types of hydropower which is common usage in world. Micro hydro: provide few hundred kilowatts to remote villages, homes and small industries.[26] Pumped-storage hydroelectricity: stores the water that has been pumped during low demand and generates it when demand is high.[26] Run-of-the-river hydroelectricity: it will capture the kinetic energy in rivers without using dams.[26] Conventional hydroelectricity: power comes from the potential energy of dammed and water drives the turbine to generate electricity.[27] The most common type of hydropower that has been used is conventional hydroelectricity known as hydroelectricity power plant which is uses a dam on a river to store water in a reservoir. This power station is usually placed in hill areas so can build dams easily and can obtain larger water reservoir and generate huge quantity of electricity. [28] 3.5.2 How is hydroelectricity power produced?http://cwc.gov.in/Kids%20Corner_files/hydropower.gif Figure 3.2: Simple Hydropower station diagram In hydropower station, the potential energy that stored in body of water at a given height is converted to kinetic energy which is used to rotate the turbine and produce electricity. [28] In the generation of electricity by using hydroelectric power, water is accumulated or stock up at higher level and guide descending through large pipes to lower level known as penstock. [29] Once the water reaches the end of the penstock with higher pressure it will hits and drives the turbine to create mechanical energy from kinetic energy. Turbines rotate the connected to shaft which is turn the generator and change mechanical energy to electrical energy. [9] Inside the generator there is rotor that covers by turbine. Large electromagnets are attached to the rotor located within coils of copper wires called as stator. Flow of electrons is formed in the coils of stator when a generator rotor spins the magnets. [31] This produces electricity that can be step up in voltage through the station transformers and centre cross transmission lines. Therefore, transmission line conducts electricity from hydropower plant to the distribution system. There are certain advantages and disadvantag es of using hydroelectric power station: Advantages It is constantly renewable remaining to the habitual nature of the hydrologic cycle. The water that been used for generation of electricity can be utilize for irrigation, boating and fishing, kayaking and etc. Fuel is not burned so there is minimal pollution and no waste is produced Using water to run the power plant that provided free by nature Disadvantages Only at limited places hydropower plant can be constructed. Dams are expensive to build. Possibility of dam collapsing 3.6 Solar energy Solar energy is the radiant energy emitted by the Sun that is converted into thermal or electricity energy for homes and industry usage. The amount of energy falling on the earth is given by the solar constant, but very little use has been made of solar energy. [32] Renewable and sustainable energy source such as solar energy make use of it around the world to produce electricity for number of different purpose and its use is both environmentally-friendly and cost-effective over the long term. There are varieties of technologies that have been used to take benefits of solar energy. Types of technologies such as photovoltaic system is common have been used to develop solar energy for daily and powering numerous applications. [33] Photovoltaic system (PV) is solar cells or panels directly convert sunlight into electricity. [34] The conversion of sunlight directly into electricity (DC) will be done by solar cells. Electricity from solar cells is stored in the battery for instant or future usage and where an inverter is required to change the Direct Current (DC) to Alternating Current (AC) to power the most AC appliances. [35] Photovoltaic system solar cell made of semiconducting materials that related to those used in computer chips. Once the rays are engaged by these materials, the solar energy knocks electrons loose from the atoms, via allowing the electrons to flow through the material to produce electricity. This process of converting light (photon) to electricity (voltages) is called as photovoltaic (PV) effect. [36] The simple of photovoltaic (PV) system illustrated in figure below that can explain about it.A diagram of how the components of a PV system interact with each other. Figure: Simple Photovoltaic (PV) system with components The electricity that generated can be stored or directly utilize by photovoltaic standalone system, or a huge electricity grid powered supplied by central generation plants (photovoltaic grid-tied system), or else joint with single or numerous domestic electricity generations to supply into small grid (photovoltaic hybrid system). [37] Supplying of DC and/or AC electrical load that operate independently of the electric utility grid is designed by standalone photovoltaic system. Direct-coupled system is of the simplest type of standalone photovoltaic system that the DC output of a module or array is directly connected to a DC load (figure). [38] When there is no electrical energy stored in batteries in direct-coupled system, the load can operates during the sunlight. So, common applications that used for example water pumps, ventilation fans and small circulation pumps for solar thermal water heating systems are appropriate. [38]A diagram of a stand-alone photovoltaic system. Figure: Direct coupled PV system Hybrid system only integrates more than one generating source, which may use an engine-generator, wind, or utility power as a supplementary power source. Initially the battery store is recharged by the photovoltaic system once insufficient the generator charges the batteries. Solar Hybrid System Figure: Photovoltaic hybrid system Grid tie photovoltaic system is deliberate to work with utility grid power. Direct Current (DC) power from the Photovoltaic array into Alternating Current (AC) power is converted by the inverter. AC appliances or local utility company can make use of the direct AC power.Solar Grid-Tie System Figure: Photovoltaic Grid Tie system 3.7 Wind Energy Wind energy is the renewable power or energy which comes from the air that flowing across the earths surface. Wind energy is a converted form of solar energy. [40] Wind is exist due to uneven heats of the atmosphere by sun, the irregularity of the earths landscape and rotation of the earth.[41] Movement of air from region of higher pressure level to region of lower pressure level is also known as wind. When hot air increases, the atmospheric pressure will reduce at earths exterior, and the cooler air will travel in to fill up the void. In fact, flow of wind patterns are personalized by earth landscape, vegetative cover and bodies of water. One of the fastest growing sources of electricity and fastest growing markets in the world today is wind energy because is green power, sustainable, affordable, and economic development. [42] In wind turbines there are consist of horizontal and vertical axis wind turbines been designed for rotation function. 3.7.1 How a wind energy or wind turbine is work? Terms of wind energy or else wind power illustrate the generation of mechanical power or electricity by using wind. Air has mass when it is in motion, and it contains the energy of that motion, known as kinetic energy. [40] Therefore wind turbines are usually use to harvest the kinetic energy and convert it by using inverter into utilizable which can provide electricity for home, business applications and for sale to utilities. Wind turbine also produce mechanical energy that harvested from kinetic energy to drive machinery, for instance grinding grain and pumping water, the device called as windmill or wind pump in rural place. wind energy diagram Most common method to generate electricity is by using wind turbines. Figure 1 is explaining the simple understand on working principle of wind turbines. Explanation from the figure 1, wind will turn the large turbine blades; the turning energy will spins a generator shaft and produces electricity. The electricity that produced by wind turbine is Direct Current (DC) and it cannot use because household appliances and use Alternating Current (AC). Hence, inverters connect to wind turbines to the mains power of a building and used to convert the DC electricity into useable AC electricity. [43] Small-scale of wind energy does not use inverters, as an alternative using the wind energy electricity can be charge batteries, connected to buildings main power or else connected to national power grid. [44] Advantages There are no fossil or fuels required to generate electricity [45] Wind energy does not pollute at all so does not harm environment or discharge any toxic gases[7] Wind energy directly can be used as mechanical energy[47] Disadvantages Once there is no wind, solar energy or geothermal energy use as alternative way to generate electricity [48] Need expensive storage throughout peak production time.[49] Requires large scale area to build wind farm.[49] 4. Conclusion Green energy is the only visible solution so that the future generations are not compromised

There are two main designs of telescopes

Astronomy can be defined as the study of all electromagnetic radiation from outer space. This definition encompasses the nature of the field, that the objects actually under study – the planets, stars, galaxies, et. al – are quite unreachable and such, information and knowledge we have of them stems not from direct experimentation but from observation of their emitted radiation.For most of astronomy’s history, that radiation was in the form of light and the primary tool for gathering and observing that light was the human eye. Without any aids, early astronomers such as Tycho Brahe, the Mayans and the Egyptians were able to develop a very detailed understanding of the stars and their motions.Ever since Galileo pointed his telescope towards the heavens, astronomy has been revolutionized. Far from being a study of celestial motions, astronomy evolved to the study of the actual celestial objects. The telescope allowed for direct observation of these specks of light traveling in the velvet sky.Moreover, the telescope allowed us to see what is impossible to perceive with the naked eye. Even the most basic telescope available today can reveal craters on the moon, or the moons of Jupiter and the rings of Saturn.There are two main designs of telescopes – reflecting and refracting. A telescope’s main function is to do one thing – gather light and focus it to one point. Refractor telescopes do this using lenses – curved pieces of glass which light passes through. The type of lens used by refractor telescopes are convex lenses which make parallel rays of light (emanating from the astronomical object) converge to a single point.The path of the light gets bent as it passes through the lens resulting in all the light rays being focused to a single point. In the case of reflecting telescopes, light is focused through the use of curved mirrors. Light being reflected by the mirror is directed to a single point. The shape of mirro rs used in reflector telescopes can include parabolas, hyperbolic and elliptical curves depending on the specific design of the reflector telescope.Today, the largest telescopes are all reflector telescopes. This is because to some inherent advantages in reflector telescopes. First, we need to realize that a telescope is a very precise optical device. With a reflector telescope, we only need to have one very precisely made side – the mirrored side of the glass reflector. Compare this to a lens where light has to pass through.A lens would have two surfaces which need to be perfectly polished, resulting in twice the amount of effort. Couple this with the fact that most contemporary refractor designs rely on multiple lenses to correct for optical aberrations. Secondly, reflector telescopes are more structurally sound at large sizes. Since light does not have to pass through the mirror, a support structure can be placed directly underneath the mirror.The support structure would b e much harder to create for a refractor telescope. Firstly, the shape of the convex lenses means that it is heaviest at the center. Secondly, even if it is heaviest at the center, the support structure can only be made at the edges due to the need for light to pass through the lens.As we said earlier, the primary purpose of a telescope is to gather light. A common misconception is that telescopes are used to simply make far away things look nearer, that is a telescope is supposed to magnify the view of objects. The magnification of a telescope is not a function of a telescope itself but a function of the telescope’s focal length and the focal length of the eyepiece used in viewing.The magnification is equal to the focal length of the telescope divided by the focal length of the eyepiece. This means that a single telescope can have many different magnifications depending on the eyepiece used. One might be tempted to think that telescopes can have infinite magnification simply by using eyepieces with shorter focal length.In reality, the highest magnification for a telescope is around 50 x the aperture (the diameter of the telescope’s objective optical element) in inches. This limitation is due to several factors. First, high magnifications will result in a dimmer image. Secondly, aberrations in the atmosphere and optical train become more obvious with high magnifications.Secondly, there is a limit to magnification as optical limitations would place a threshold on the available resolution produced by the telescope. Any magnification beyond this threshold only produces empty magnification as not additional detail can be resolved.The ability of the telescope to resolve details is inversely proportional to its aperture. This is set by the Rayleigh, Dawes and Sparrow’s limit which all say that the limiting resolution of an optical system is some factor divided by the diameter of the optic. Simply put, the larger the telescope, the higher its reso lving power.

Role Of The Dental Nurse And Measuring And Recording Root...

Q4) During a root canal treatment how do you assist the operator in measuring and recording root length? Why is this necessary? There are few ways how to measure length of root like placing single file in the root and taking radiograph or using apex locator. The role of the dental nurse is to make sure all necessary instruments and equipment are ready for appointment. What needs to be ready for radiograph method: x-ray machine + all chemicals for processing (if manual processing is used) or laser scanner (digital processing) + film; ruler, different lengths of files; file holder with sponge. What needs to be ready for apex locator method: apex locator with all wires and; different lengths of files; file holder with sponge. During procedure nurse is usually passing instruments, making sure equipment is set up and ready to go, assisting with taking radiographs, taking care about patient’s escort during taking radiographs, making sure patient is comfortable and calm, processing x-rays, also working length have to be recorded in the patient notes either paper or digital or both Correct length should be recorded for following reasons: - To be sure right size of gutta percha is choose in order to fill whole length of root canal except 2mm at the apex - For the second stage of root canal= it’s not necessary to re-measuring canal - Prevent perforating apex as this can lead to further problems - For the other dentist to be able take patient over - For the future references in theShow MoreRelatedHuman Resources Management150900 Words   |  604 PagesManagement After you have read this chapter, you should be able to: ââ€"  Identify four major HR challenges currently facing organizations and managers. 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Master Thesis Logistics Management in Retail Industry

JÃâ€"NKÃâ€"PING INTERNATIONAL BUSINESS SCHOOL JÃâ€"NKÃâ€"PING UNIVERSITY Master Thesis Logistics Management in Retail Industry A case study of 7-Eleven in Thailand Master Thesis within International Logistics and Supply Chain Management Authors: Latika Supasansanee Patthaveekarn Kasiphongphaisan Susanne Hertz Benedikte Borgstrà ¶m June 1, 2009 Tutors: Jà ¶nkà ¶ping: Acknowledgement ____________________________________________________________ _______________ There are many people involved in the process of our thesis and motivated us in one way or another and, as well, make our academic work more fruitful. First, we are grateful to our kind supervisors, Professor. 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The Insanity Defense By Steven Steinberg - 1084 Words

While reading chapter 2 of The Insanity Defense we discussed many different versions of the insanity defense and whether or not they’re valid or not. This interested me so much that I decided to actually go online and research the most ‘insane’ ways to use the insanity defense. Within this research I found various cases where it was used and was so shocked at how bizarre almost all of them are that I decided to write a 3-page paper on it, enjoy. The first case I read about brings us all the way back to 1981. In Arizona, Steven Steinberg awakens from a sleep to find his wife stabbed to death 26 times. Steven quickly fumbles over her body to the phone and calls police immediately. He tells them his wife has been murdered in a burglary gone wrong. Upon investigation though, police discover that this was no burglary, that in fact Steven was the one who has killed his wife. Steven in a state of confusion recounts that night because he has no memory of murdering his wif e, he explains to police he had no reason to, he loved her. This case then went to trial and Steinberg told judges that he was sleepwalking at the time of the murder, and therefore not ‘sane’ during it. The jury found Steven Steinberg not guilty and he was free to go. So is sleepwalking a valid insanity defense? In my opinion yes, I believe while sleepwalking you’re in a dissociative mental state that you can’t control. When sleeping your daytime reality becomes a distorted dream, in Stevens case his wife wasShow MoreRelatedThe Murder Of Murder By Steven Steinberg Essay1695 Words   |  7 PagesIn 1981 Steven Steinberg was accused of murdering his wife Elena Steinberg by stabbing her twenty-six times in Scottsdale, Arizona (Guy, 2015). At the time of the murder, Steinberg was the one who called law enforcement to report an attempted break-in at his home, even though no signs of force entry were found at the scene. During that time, the case drew a lot of publicity in the state of Arizona; not only because it was a horrifying crime, but because it was a case that involved a murder whileRead MoreThe Ideological Concept Of Insanity Defense2313 Words   |  10 PagesThe ideological concept of an insanity defense, formerly termed â€Å"complete madness,† was originally incorporated into the English common-law jurisprudence system in the late thirteenth century of the United Kingdom as an affirmative defense for defendants under the yoke of criminal charges involving a heinous action which could involve the option of termination of a defendant’s life if adjudge guilty of such act (Hill). Through such incorporation of a legal defense, the institution of a new societalRead MoreWhen Pleaded Not Guilty By Insanity1858 Words   |  8 Pagesâ€Å"They smelled too bad† was the response when saying he would never have intercourse with the dead bodies he dug out of graves (Yoong). He pleaded not guilty by insanity. Ed Gein filled his home in Connecticut with human body parts; he assembled a suit made of human skin, a belt that was made of female nipples and a lampshade formed from a human face. Gein was interested in skinning people and also the female parts. On November 1957 Bernice Worden disappeared from her local hardware store (Yoong)Read MoreOne Significant Change That Has Occurred in the World Between 1900 and 2005. Explain the Impact This Change Has Made on Our Lives and Why It Is an Important Change.163893 Words   |  656 Pagestime after the death of Mao in 1976. But the modernizing leaders, who wanted to end the ideological turmoil in favor of economic and technological development, arrested her. At her trial in 1980–1981, Jiang actually helped undo the Mao myth by her defense, which focused on Mao’s arbitrariness and use of brute power: â€Å"I was Mao’s dog,† she proclaimed. â€Å"What he said to bite, I bit† (Terrill in Smith 2008, II:652). Elsewhere, women participated in the resurgence of the nationalist independence movements

The Largest Earthquake in the World Free Essays

The largest earthquake in the world had a magnitude of 9. 5 and took place in Chile. The Valdivia Earthquake, also know as the Great Chilean Earthquake, happened on Sunday, May 22, 1960. We will write a custom essay sample on The Largest Earthquake in the World or any similar topic only for you Order Now It is the largest earthquake currently on record. It occured in the afternoon and the resulting tsunami affected southern Chile, Hawaii, Japan, the Philippines, eastern New Zealand, southeast Australia, and the Aleutian Islands in Alaska. The epicenter of the Valdivia earthquake was near Lumaco, a coastal city with a population of roughly 11,405. Various estimates of the total number of fatalities from the earthquake and tsunamis have been published, with the USGS citing studies with figures of 2,231; 3,000; or 5,700 killed, and another source uses an estimate of 6,000 dead. An estimated cost of 2. 9 to 5. 8 billion in damage. The 1960 Valdivia earthquake was actually just a series of many strong earthquakes from May 21 to June 6,1960. The first was the Concepcion earthquake and the strongest was the Valdivia earthquake. The first Concepcion earthquake was on May 21,1960. Its epicenter was near Curanilahue. The second and third Concepcion earthquakes occurred a few hours apart from each other on May 22. The Valdivia earthquake occurred on May 22. This earthquake affected all of Chile between Talca and Chiloe Island, more than 150,000 sq mi. Most coastal villages disappeared. At Corral, the main port of Valdivia, the water level rose 13 ft before it began to recede. A wave of 26 ft struck the Chilean coast, mainly between Concepcion and Chiloe. Ten minutes later another wave measuring 33 ft was reported. Hundreds of people were already reported dead by the time the tsunami struck. One ship, Canelos, starting at the mouth of Valdivia River sank after being moved 0. 93 mi backward and forward in the river; its mast is still visible today. A number of Spanish-colonial forts were completely destroyed. Soil subsidence also destroyed buildings, deepened local rivers, and created wetlands in places like the Rio Cruces and Chorocomayo, a new aquatic park north of the city. Extensive areas of the city were flooded. The electricity and water systems of Valdivia were totally destroyed. Witnesses reported underground water flowing up through the soil. Despite the heavy rains of May 21, the city was without a water supply. The river turned brown with sediment from landslides and was full of floating debris, including entire houses. The earthquake did not strike all the territory with the same strength. The two most affected areas were Valdivia and Puerto Octay near the northwest corner Llanquihue Lake. East of Puerto Octay in a hotel in Todos los Santos Lake piles of plates were reported to have remained in place. Two days after the earthquake a volcanic vent erupted. Other volcanoes may also have erupted, but none were recorded due to the lack of communication in Chile at the time. The relatively low death toll in Chile, estimated at 6,000, is explained in part by the low population density and by buildings being built taking into account that the region has many earthquakes and volcano eruptions. Other possible reasons include a high number of wooden houses and that coastal towns also tended to be located on higher ground. After the eruption, began the landslides. The earthquake triggered many landslides, mostly near the Andes. These landslides did not cause many fatalities nor significant economical losses because most of the areas were uninhabited with only minor roads. One landslide did cause destruction and alarm following its blockage of the outflow of Rinihue Lake. About 100 km south of Rinihue Lake, landslides in the mountains around Golgol River caused this river to dam up and then burst creating a flood down to Puyehue Lake. The Valdivia earthquake led to the formation of the ONEMI. ONEMI is the Spanish acronym for National Emergency and Information Office. ONEMI helps solve problems after earthquakes, large or small. The Valvidia earthquake was also referenced in two fictional novels, and the tsunami following the earthquake was referenced in a Hawaii Five-O episode titled â€Å"Forty Feet High and it Kills! â€Å". How to cite The Largest Earthquake in the World, Essay examples

Types of Cloud Services Used by Business-Free-Samples for Students

Question: Discuss about the Advantages and disadvantages of Cloud Computing in Business. Answer: Introduction: The cloud computing has been delivering the ways for the current businesses for managing the computing resources in online. The word has developed in the recent years and is used for describing the third party usage for the computing and storage needs (Hashem et al., 2015). A list of advantages and disadvantageous rising from cloud computing is brought in this report. This is done from the perspective to help in understanding the idea of cloud computing. The report has analyzed the project scope and objectives, and provided an in detailed literature review regarding the concern. Lastly, an effective conclusion is drawn keeping the cloud computing and its various ways of impact, both positive and negative, on the business sector, in mind. Project objective: The objective of the project includes the converting of the external packaged applications like Google email turning into the SaaS tenant. Then it should help in implementing Microsoft Office 365 in cloud. Moreover it must create cloud-based storage/server infrastructure as the standard resources for the corporate users. The project must establish the testing platform of standard program and deploy the development ser tool regarding the development of cloud applications. Moreover a latest enterprise application of cloud-based could be developed utilizing the current PaaS environment. A cloud-based backup of data or any system of recovery system must be implemented and a cloud-based system of security management should be acquired Project scope: The scopes of the project must include: What amount of cloud ecosystem is to be incorporated in the scope of the project? Has been the formal procurement needed or have the cloud record vendors been appointed already? Is there any need of business case based on cloud or has any first policy of cloud been adopted already? Have there been any unique customization, specialization or integration requirements for the required application? Has there been any potential compliance or any extra regulatory roadblocks? The Project manager must also establish the maturity level of the companys cloud before doing the in-detailed planning for the given project. The maturity level must include the starting, repeatable, the systematic, measured or the optimized. The literature review: The background: The cloud computing has been developing like never before in organizations of every size and shape adapting to this latest technology. The industry experts, Rittinghouse and Ransome (2016) have believed that the trend should continue to evolve even more in the upcoming years. The cloud computing has been in no doubt advantageous for the medium to large companies without the downside particularly for the smaller businesses. According to Hameed et al., (2016) the cloud computing has been seemed to be a buzzword of this decade and the business have been making the switches every day more than before. The IT processes could make the regular computing much simpler while harnessing the efficiency of the cloud computing to the streamline. Before making any switch the companies must be aware enough whether they are ready or not. There lies no confusion that the businesses could reap large benefits from the technology. It contains its own ups and downs. However, Patel et al., (2013) states that apart from the loss of various celebrity figures, the year 2016 is an epitome to retrospect. The up-going and downfall also includes some significant data breaches that have hit the news. Despite this, the cloud emerged the other side stronger and bigger than previous. In fact, it has made the headway so much that it has been a quarter as popular than it has been four years back. This indicates that the cloud has been not on the horizon any more. It has been no longer in the stage of early adopter. It is established and expected to stay well enough. It has been once the purview of the conglomerates and large companies. It has reached a new height of democratization. Here the business can now get benefit from cloud irrespective of their size. This is due to the fact that it has overcame the starting years of hype and has witnessed larger adoption as the de facto solution of IT for the business as researched by Fernndez et al., (2014). Usage of cloud computing in business: The term cloud in the article of Gonzlez-Martnez et al., (2015) has been referring to the internet and the operation within the cloud indicates the approach in which the data is stored and accessed via internet connection. The cloud computing has been permitting the business to make access unto their data virtually by creating a global and flexible way to access information any time, any place. The cloud computing is the broad term denoting various kinds of cloud services. It includes the cloud storage that deals with the storing and backing up of files to access regularly and share and syncs them around devices. Next it is used for cloud backup. Unlike the cloud storage it basically utilizes the backup source during cyber attack, crash and the other data losses. It is also used as SaaS( Software as a Service) using the web for providing services like Salesforce, QuickBooks Online, Google Apps and Office 365 (Mezgr Rauschecker, 2014). Lastly it is used as the cloud hosting that facilitates every kinds of sharing of information like application hosting, email services, data storage and web-based phone systems. Types of cloud services used by business: Modi et al., (2013) helped in understanding that the business owners have been using three kinds of cloud services for storing their information and to provide services. The first one is the public cloud that is built on the external platform which is run by the cloud service provider. With the help of this off-site cloud service, the users achieve their own cloud under the shared infrastructure. The provider has been offering all the things from the systems resources to maintenance and security of the cloud system. It has been managed by the external company specialized in cloud services, for a broader range of customers. Hence a public system of cloud is effective for the companies requiring more cost-effective, elastic and latest technology. The next one is the private cloud, which the platform is built under the companys own walls on the companys own software and hardware. As a private cloud is controlled by the companys own internal team of IT, it has been exemplary for businesses that need exclusive access, greater control and more flexibility regarding cloud. However, for using the private cloud service, the companies have been building their own information centers making that an expensive cloud option. The last one is the hybrid cloud that has been employing both the public and private clouds. Here the own team of companys IT controls some part of cloud in-house and the remaining off-site. For example as given by Mathew, Sekaran and Jose (2014), it is great for any company that needs to control the business related data like the customer files in-house and on the other hand needs to store the information which is less sensitive with the third party. The advantages of cloud computing in business: The business has been using cloud computing for accessing data anywhere in any type of compatible device. Instead of storing data in the computer or in any server at the office, the cloud computing has been storing data over the internet as argued by Moharana, Ramesh and Powar (2013). It has been working making data available from the core hub which is web-based. It has been giving anyone the needed credentials access with the internet connection from any location. The cloud computing has been also syncing information every devices that is linked to the cloud. This is done keeping them up-to-date with the real-time information. Zhan et al., (2013) demonstrated that the users could access every kind of files in the cloud environment. They can utilize the applications like they have in the office and could also collaborate remotely whole working over the similar project or the presentation on the device as anyone over the other side of the world. As anyone is away from the work or the office server gets inaccessible the data in the cloud is upgraded every time and available at any time, any place. The services of cloud computing could be ranging from the functional programs to the data storage including the remote desktop hosting, customer service tools and accounting. Some of the highlighted advantages of cloud computing is discussed hereby. Fresh software: According to Manvi and Shyam (2014) with the SaaS, the current version of these applications required to undergo the business have been made available to every customers as they gets released. The quick up-gradation inserts latest functionalities and features in the hand of the workers making them more productive. This has been unlike the purchased or home grown software that possess latest releases primarily once in a year and an adequate time for rolling out. Doing more with the less: With the help of this technology, the organizations could decrease the size of their data centers. They could further eradicate the footprint of the data center altogether. The decrease in number of staff, software cost and the number of servers notably reduces the cost of IT affecting the IT capabilities. Flexible costs: The expenses of the cloud computing has been very much flexible than the conventional ones. Garrison, Wakefield and Kim (2015) analyzed that more capacities could be provisioned in the peak times and could be de-provisioned when not needed. The always-on availability: The connections are on every time as long as the employees possess the Internet connection. Some of the applications have been even working in off-line. The enhanced mobility: The applications and data have been able to the employees regardless the fact that where they have been. The employees could carry their tasks anytime anywhere. Arising collaboration: The application enhances the collaboration through permitting the dispersed group of individuals for meeting virtually. They can also share data easily in real time through the shared storage as mentioned by Sadiku, Musa and Momoh (2014). Cost effectiveness: The companies need not to buy the equipments and operate and built out the data centers. Hence they do not need to spend huge money on the utilities, facilities, hardware and other elements of the operations. Quick reduction of expenses: When the recession time or the business cut-backs takes place, Sajid and Raza (2013) writes that the cloud computing delivers the flexible structure of cost. Thus it restricts the exposure. The flexible capacity: The cloud has been the flexible facility that could be turned down or up or off. This depends on the situations. For instance, Sadooghi et al., (2017) states that the promotion of sales could be popular widely and the capacity could be added fast for avoiding the losing sales and crashing servers. As the sales gets over, the capacity could shrink in reducing costs. Facilitating the management and the administration activities: The cloud computing has been accommodating the quick changes such that two organizations could turn into one much efficiently and quicker. Lesser environmental effect: With the fewer worldwide data centers and more effective operators, the business has been having lesser influence on the environment. Chandrasekaran (2014) quiet argues that the businesses using shared resources enhance their green testimonials. Disadvantages of cloud computing: The cloud computing has delivered certain advantages by saving money and time for the business. However, according to Rajaraman (2014), alike many other technologies it has possessed its share of drawbacks. Hence, it has been vital to be aware of the potential issues and the shortcomings before any business decides to put back the IT infrastructures and go for the virtual facilities over the cloud. The several disadvantages are discussed hereby. The possible downtime without any internet connection: The cloud computing has been fully relying on the Internet connections. As the connection or the network gets down, the cloud services could get down as well. The entire system or the operations could turn idle as there has not been any alternative internet connection or necessary back-up. The security and the privacy issues: The security in the cloud has been usually reliable and good. However, the vendors of the established cloud computing have been ensuring that they have the most sophisticated and the latest systems of data security. Hsu et al., (2014) showed that this is because the data security has been huge concern for the businesses. Moreover, there lies another concern regarding the security is the attack of the hackers and breaching of the systems. The privacy has been another issue. As any user logs into from any location for accessing the applications and data, it has been possible that the privacy if the use can get compromised. No presence of hard drives: Some customers might recognize it cheaper to eradicate the hard drives since that could decrease the costs. However, those who have been using the programs that has been requiring any embedded hard drive, the usage of the cloud computing could be inconvenient enough. Data ownership: Duan et al., (2013) emphasized on the fact that this could be an important hurdle especially when the business possesses loads of data for handling. There has been no clarity regarding the data ownership. So there might not be any proper answer to the basic questions owning the data maintained by the cloud storage services. This has been regardless whether that has been the uploader or data storage provider. Inflexibility: While going for the vendor of cloud computing, the terms and conditions are too checked so that never locks the business into using the proprietary formats or applications. There must be situations when any document could not be inserted generated in other application. This might be detrimental for the business. Lack of support: In comparison to the custom-built software and the most packaged ones, the cloud services never have the effective support of customer care system. This it could be hard in getting them on the e-mail or phone as per as Rajaraman (2014), as they generally never deliver the illustrated manual for the users Integrating the latency and the peripherals: The business might face various hardships in connecting the wireless devices. This has been particularly as it come to the personal devices like the printers to cloud network as disclosed by Chandrasekaran (2014). There might be also problems regarding the software incompatibilities since most of the devices have been still designed for connecting particularly to any PC. There might be also latency issues or any time lag while linking the system to the servers of remote clouds. Conclusion: Like every other things the cloud computing too possesses its pros and cons. As the technology has been proving to the highest asset to the business, it could also be the reason of harm as not used or understood properly. It has been offering the business with many advantages. It has been permitting to set up the virtual office. This has been providing flexibility to connect the business anytime and anywhere. With the rising number of the devices that are web-enabled used in the current business environment, the access to the data is also easier. Working off the hard drive is the way in which the IR industry has functioned for long time. As the businesses address their concerns regarding compliance and security by widening the corporate policies to the data in the clod and invest in the gaps of cloud skills, they could more fully take the best from the advantages of the cloud services. References: Chandrasekaran, K. (2014).Essentials of cloud computing. CRC Press. Duan, J., Faker, P., Fesak, A., Stuart, T. (2013). Benefits and drawbacks of cloud-based versus traditional ERP systems.Proceedings of the 2012-13 course on Advanced Resource Planning. Fernndez, A., del Ro, S., Lpez, V., Bawakid, A., del Jesus, M. J., Bentez, J. M., Herrera, F. (2014). Big Data with Cloud Computing: an insight on the computing environment, MapReduce, and programming frameworks.Wiley Interdisciplinary Reviews: Data Mining and Knowledge Discovery,4(5), 380-409. Garrison, G., Wakefield, R. L., Kim, S. (2015). 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