Case Study Mkd Transporters Inc. - 1354 Words

MKD Transporters Inc. MKD Transportation is a worldwide delivery organization. The media allegation that one of their vessels was releasing an oily substance off the coast of Belize, which would pose a quick danger to the coral reefs, reached agency officials. Belize is the biggest second barrier reef on the planet. It is home to the most lovely, splendid, and bright coral reefs drawing scuba diving and snorkeling tourists, which is paramount for the fishing industry to supply food, and needs to secure the marine assets from people, creatures, and regular exercises. The captain of the ship in question failed to contact the company adding insult to injury and possibly costing the company extensive cost for the cleanup. The chief of the boat being referred to neglected to contact the organization compounding an already painful situation costing the company far-reaching expense for the cleanup. Environmental groups alongside the legislature of Belize have requested MKD admit the guilt and accept responsibili ty to eradicate the problem. Ethical Behavior Moral conduct (ethical behavior) comprises of regarding some critical appropriate standards like genuineness, decency, balance, regarding the respect, differing qualities, and privileges of other individuals. All that we do is a decision, so moral conduct is continually picking the proper thing to do. Ethical behavior is critical in business, MKD builds its arrangements with respect to excellent morals, and it is an essential

Optimization Of Mrr And Surface Roughness Parameter During...

Optimization Of MRR And Surface Roughness Parameter During Turning And Drilling Operation On Mild Steel Bright In CNC Lathe Using Taguchi Technique: A Literature Review Mansuri Sufiyan, Ghanchi Safik, Rana Pragnesh, Modhiya Zankar, Qureshi Shadab and Manoj Kumar Pal, Agrawal Chetan. Institute of Technology and Management, Vadodara 1. Abstract The Main Objective of Presentation this paper is to make attempt to Acquire Brief overview of the need of Optimization process in Recent Manufacturing Trends. The Drilling and Turning is essential Operation that is carried out by every manufacturing firm using mostly Computer Numerical Control Machines. The purpose of the Product Quality improvement is to satisfy Customer need and expectation. Thus Improvement in Product quality can be achieved by Taguchi Robust Design Method for Drilling, Turning, Facing, Boring etc Operations. The S/N ratio and Analysis Of Variance (ANOVA) is going to implement to know contribution of each selected parameters on Surface Roughness and MRR. For the improvement in Drilling process the Control parameters considered are Depth of cut, Feed and Cutting Speed and for Turning control parameters are Feed, Speed and Depth of cut irrespective to the Surface finish and Material Removing Rate With Considering presence and absence of cutting fluid. This paper re views various literatures on optimization of drilling and turning process by studying influence of various parameters like feed, depth of cut, speed,Show MoreRelatedA Brief Note On Electrical Discharge Machining ( Edm )1861 Words   |  8 Pagesand other source in the media. We are broadly classified all the paper into five different category, i.e. paper related to Electrical discharge machining (EDM), material related (workpiece or tool), some paper related to the effect of input parameters on (MRR,TWR and SR), dielectric fluid and the effect of flushing. 2.2 Electrical discharge machining (EDM) It is a process that is used to remove metal through the action of an electrical discharge of short duration and high current density between

Should Sex Ed Be Taught in Schools free essay sample

Sexual education is very important for children with a developing body and for teenagers with questions about sex. Sexual education in schools can be very beneficial for children and teenagers. Knowing about the inevitably changing body may help the process. Sexually active and potentially sexually active teens should be educated on contraceptives, STDs, and abstinence. This is why our group thinks that sexual education should most definitely be taught in schools. Sexual Education is taught throughout the United States. Only 3 states require consent before the school may give any sexual education to the children and 35 states allow the parents to opt out for their children. There are two major kinds of sexual education: abstinence based education and a comprehensive based education. The abstinence based sexual education focuses on abstinence and not having sex before marriage. The comprehensive sexual education may start as early as 5th grade and covers the topics like proper use of contraceptives, STDs, safe sex practices, sexuality and masturbation. Some schools may even teach both practices. 37 states are required to include sexual education instruction and 11 require only that it is included somehow in the education. In 2009 the CDC conducted a survey and reported that almost 50% of high school students said they had sex. 14% of those students had 4 or more partners. Although the teen pregnancy rate has declined, it is still the highest of all developed nations at 68 per 1,000. Canada’s teen pregnancy rate is 27 per 1000. Most teens are getting education on abstinence, STDs, HIV but are not learning how to properly use contraceptives. Any many teens have not been taught how to properly use any contraceptives before their first sexual encounter. Approximately 65% of high schools teach their students about condoms and 39% of schools taught their students how to use them. Sex education is taught widely across the US, yet the positive and negatives are still being debated. Many people as well as education systems think that sex education is a positive thing, that it should be embraced by schools. In 2004 a poll by NPR, the Kaiser Family Foundation, and Harvards Kennedy School of Government found that only 7 percent of Americans say sexual education should not be taught in schools. Some of the positive effects of sexual education on students are socially related, in that they are learning this often embarrassing information at the same time as their peers and they do not feel left out of the loop if other students are talking about something that they do not understand. It makes learning about this sensitive subject easier for the students if they know that they are not alone in learning about sex. Also it makes having â€Å"the talk† easier for both parents and their children if there is already a foundation of knowledge about sex and the available contraceptives. Some students may live in single parent homes or with other relatives and my not feel comfortable learning about sex from them. Also parents may not be aware of all the information about sex and safe sex that the school system teaches. Having sexual education classes in schools ensures that the students are getting correct and factual information in a structured way, in a less awkward environment. Sexual education classes cover in depth information about STDs and other sexually transmitted diseases that show students the importance of safe sex. Sexual education teaches about available contraceptives and ways to practice safe sex. Students are also more likely to pay attention and retain more information from class, in which they are provided resources, than if taught by parents. Other positives can be seen in the numbers; the CDC announced in 2011, that the US teenage pregnancy rate has hit a record low. The study[-gt;0] looked back at all the teenage birth statistics from 1991 2009 and found that the latest results reveal a 37% decrease. One of the reasons is thought to be better Sexual education classes and teachings about sex. Although, there is a lot of rather persuasive information on the benefits of sex education in schools, there are always two sides to a story. The benefit of informing young adolescents about sex also comes with an immediate disadvantage, which is, that you are projecting thoughts and ideas about sex into the minds of children who never considered it to begin with. Many critics of sex education in schools make this case. They point out that it is unwise to teach someone about a behavior you do not want them to engage in. This is analogous to explaining the inner workings of how a bank functions to the public; obviously, banks do not reveal this information freely and it if they do, it is on a need to know basis. Psychoanalytically, it is true and proven that people will naturally try something they are curious about or have never experienced; especially, when the outcome is associated with pleasure. Many Americans agree that pre-teens and teens should be taught sex to varying degrees; despite this, statistics reveal that most disagree on how to approach the issue of contraception or if it should even be approached in the first place. Some factions believe in only abstinence, rebuking the thought of using contraception. There is a tendency for people to think it is ok to educate with constraints, akin to riding a bike with training wheels; unfortunately, education cannot be contained in this manner. If the medium is going to be taught, it should be unleashed without inhibition in order to be fully understood; otherwise, you will end up with a generation of youngsters who only have bits and pieces of the story and must fills in the gaps for themselves. The issue of sex education will always be controversial. Some will always view anything in this arena to be invalid and unacceptable in the classroom; whereas, others will feel the opposite. There is a trend for people to forget that they were once children, making it difficult to view this matter with the same scope as the people it is meant to benefit the most. The facts tell us it is a good thing to have this subject matter in the classroom. Sex education has lowered the national teen pregnancy rate and, even though, it is impossible to know how many STD’s have been prevented from transmission, it is it safe to say it could have had a similar impact. Education is informative, enlightening, and empowering, but not always appreciated by all interpretations, which is fine. It is what the individual does with the new found knowledge that matters the most.

Wireless Elecricity Essay Example

Wireless Elecricity Essay Niharika Sharma Applied Electronics and Instrumentation Engineering, [emailprotected] com Varun Pachauri Electronics and Communication Engineering, [emailprotected] com Wireless Electricity Abstract—The present paper intends to link several disciplines in an attempt to describe the concept of wireless electricity. Wireless transmission is useful in cases where interconnecting wires are inconvenient, unaffordable, expensive, hazardous, unwanted or impossible. A large part of the energy sent out by the generating plant must arrive at the receiver to make the system economical.Some common forms of wireless electricity transmission methods are Direct Induction followed by resonant magnetic induction, electromagnetic radiation  in the form of  microwaves  or  lasers. With this technology we can reduce power losses produced through wired lines. Different concepts and application of wireless power transmission are discussed in this paper. Introduction The definition of Wirele ss Power Transmission is: efficient transmission of electric power from one place to another through vacuum or an atmosphere without the use of wire or any other substance.Maxwells theory of electromagnetism, published in 1865 mentions electromagnetic waves moving at the speed of light, and the conclusion that light itself was just a wave. In 1886 H. Hertz performed an experiment with pulsed wireless energy transfer. . He produced an apparatus that generated and detected microwaves in the UHF region. Tesla also performed experiments in the field of pulsed wireless energy transfer in 1899. Teslas Magnifying Transmitter, an early type of Tesla Coil that measured 16 meters in diameter, could able to transmit tens of thousands of watts without wires.In present electricity generation system we waste more than half of its resources. The transmission of power without wires may be one idle alternative for electricity. Future suitable and largest application of the WPT via microwave is a Spa ce Solar Power Satellite. History of Wireless Electricity In 1864, James Maxwell predicted the existence of radio waves by means of mathematical model. In 1884, John Poynting realized that the Poynting Vector would play an important role in quantifying the electromagnetic energy.In 1888, bolstered by Maxwells theory, Heinrich Hertz first succeeded in showing experimental prove of radio waves by his spark-gap radio transmitter. The prediction and prove of the radio wave in the end of 19th century was start of the wireless power. The Raytheon Company performed the first successful WPT experiment in 1963. In this experiment power was transmitted with a DC-to-DC efficiency of 13%. The Raytheon Company also demonstrated a microwave-powered helicopter in 1964. In 1975, Jet propulsion lab of NASA carried out an experiment and demonstrated the transfer of 30 kW over a distance of 1 mile.This test demonstrated the possibilities of wireless energy outside the laboratory. Rockwell Internationa l and David Sarnoff Laboratory operated in 1991 a microwave powered rover at 5. 87 GHz. Three kilowatts of energy was transmitted and 500 watts was received. In 1980s, Japanese scientists developed the MPT technologies and research. In 1983 and 1993, Matsumoto’s team carried out the first Microwave Power Transmission experiment in space. The rocket experiment was called Microwave Ionosphere Nonlinear Interaction experiment i. . MINIX in 1983 (Fig. 1) and International Space Year – Microwave Energy Transmission in Space in 1993, respectively. They focused nonlinear interaction in between intense microwave and plasmas. In this experiment, they used cooker-type 800W-2. 47GHz magnetron for microwave transmitter. New wave-wave-particle interaction phenomenon was observed in this experiment. Plasma theory and computer experiments also supported the observations. Figure 1. MINIX Rocket experiment in 1983 Technologies for Wireless ElectricityThe modern ideas are dominated by m icrowave power transmission called Solar power satellite to be built in high earth orbit to collect sunlight and convert that power into microwaves, then beamed to a very large antenna on earth, the microwaves would be converted into conventional electrical energy. A microwave transmission system consists of three essential parts: ? Electrical energy to microwave energy conversion ? Absorption antenna that collects the waves ? (Re)conversion to electrical energy Figure 2. Microwave transmitter and rectennaThe microwave source consists of a microwave oven magnetron with electronics to control the output energy. The output microwave energy ranges from 50 W to 200 W at 2. 45 GHz. A coaxial cable connects the output of the microwave source to coax-to-waveguide adapter. This adapter is connected to a waveguide ferrite circulator which protects the microwave source from reflected energy. The circulator is connected to a tuning waveguide to match the waveguide impedance to the antenna inpu t impedance. The slotted waveguide antenna consists of 8 wave guide sections with 8 slots per section.These 64 slots radiate the energy uniformly through free space to the rectenna. The slotted waveguide antenna is ideal for energy of its high aperture efficiency (;gt;95%) and high power handling capability. A rectifying antenna called a rectenna receives the transmitted energy and converts the microwave power to direct current (DC) power. This rectenna consists of 6 rows of dipoles antennas where 8 dipoles belong to each row. Every row is connected to a rectifying circuit which consists of low pass filters and a rectifier. The rectifier is a Ga As Schottky barrier diode i. . impedance matched to the dipoles by a low pass filter. The 6 rectifying diodes are connected to light bulbs for indicating that the energy is received. The light bulbs also dissipated the received energy. This rectenna has a 25% collection and conversion efficiency, but rectennas have been tested with more than 90% efficiency at 2. 45 GHz. Another possibility is to use highly efficient fibre lasers for wireless energy transmission where the possibilities are similar to microwaves concept but lasers emit energy at frequencies much higher than microwave.For several years NASA, ENTECH, and UAH have been working on various aspects of collection of the laser radiation and conversion to electrical energy for laser wireless energy transmission. Figure 3. Two optical forms of wireless antenna formed of search light beam-ionised atmospheric stream Applications of Wireless Electricity Wireless Power for Space Solar Satellites * The largest application for microwave power transmission is Space Solar Power satellites. In this application, solar energy is captured in space and converted into electricity.The electricity is converted into microwaves and transmitted to the earth. The microwave energy will be captured with antennas and converted into electricity. NASA is still investigating the possibilit ies of solar power satellites. Main problem is the high investment cost due to the space transport. The current rates on the Space Shuttle run between $7,000 and $11,000 per kg of transported material. * Table. 1-Parameters for transmiting antenna for sps system * Figure. 4. Space Solar Power Satellite Power Supply for Rural AreasWireless power can be an option for power supply to rural areas. In 1993, a project presented about wireless power supply in Alaska. Because of limited infrastructure, numbers of small rural communities in Alaska must provide their own electricity. These systems can be expensive or just not available. At the moment, the small communities produce their own power with mostly diesel engines. These produce so noise and pollution. Also the required fuel has to be transported over long distances. This results in an electricity price in excess of $40/kWh.In Alaska cable connections through water is no alternative because of ice. With the help of WPT, the required power production of the communities can be combined. It can reduce noise, pollution and transportation of fuel. WPT may be capable of transmitting electrical power to Alaska’s remote villages. To investigate these possibilities, a project was conducted named Alaska21†. System used for the project consisted of a 2. 46 GHz phased array design. The distances should be bridged are between 1 and 15 miles. Figure. 5. Alaska’21 * V.Merits of Wireless Electricity An electrical distribution system, based on this method would eliminate the need for the costly and capital intensive grid of cables, towers, and substations. The system would also reduce the cost of electrical energy used by the consumer and rid the landscape of wires, cables, and transmission towers. There are areas of the world where the need for electrical energy exists, yet there is no method for delivering energy. Africa is in need of energy to run pumps to tap into the vast resources of water under the Sa hara Desert.Rural areas, such as those in China, require the electrical energy necessary to bring them into the 20th century and to equal standing with western nations. The wireless transmission will solve most of above problems. The electrical power can be economically transmitted without wires to any terrestrial distance, so there will be no transmission and distribution loss. Figure 6. An office using wireless electricity Demerits of Wireless Electricity A common criticism of the wireless power system is regarding its possible biological effects.Calculating the circulating reactive power, it was found that the frequency is small and such a frequency is very biologically compatible. A general perception that microwaves are harmful has been a major obstacle for the acceptance of power transmission with microwaves. One major concern is that the long-term exposure to low levels of microwaves might be unsafe and even could cause cancer. Conclusion The transmission of energy without wi res is not a theory or a mere possibility, it is now a reality. The electrical power can be economically transmitted without wires to any terrestrial distance.Many researchers have established in numerous observations and experiments qualitative and quantitative. It is clear that wireless power transmission systems in the range of 100 W to 100 kW to cannot compete with traditional systems just looking at the costs. At those places where economic competition is not the prime consideration, it can be an option. Microwave wireless energy transmission can supply energy to those places that are difficult to reach. Especially small communities in rural areas could be supplied with power using wireless power transmission.The problems of a possible lack of energy during the next fifty or hundred years could be solved by the Space Solar Power Station. The system would reduce the cost of electrical power used by the consumer and get rid of the landscape of wires, cables, and transmission towe rs. It has negligible drawbacks like reactive power which was found insignificant and biologically compatible. References James O. McSpadden, â€Å" Wireless Power Transmission Demonstration†, Texas Aamp;M University, June, 1997. Elvina Finzi, Carlo Lombardi, and Leopold Summerer. A lunar IPWR: A pre-feasibility study. In IAC 2006, volume IAC-06- D2. 8. , Valencia, Spain, Oct. 2006. IAF. Thomas W. Benson, â€Å"Wireless transmission of power now possible†, News Letter, pp1118 – 9, March, 1920. Charych Arthur (Setauket, NY), â€Å"System and method for wireless electrical power transmission†, Patent No. 6,798,716, September 28, 2004. Joe T. Howell, et. al, â€Å"Advanced receiver / converter experiments for laser wireless power transmission†5th. Wireless transmission conference, pp 1-8, Garanda, Spain, 2004. Nikola Tesla, â€Å"The true wireless†, Electrical Experiment, May, 1919. Toby Grotz,† Wireless transmission of power†, Cour tesy of the Tesla BBS at 719 486-2775, August 28, 1990.Cheney, Margaret (1999), Tesla Master of Lightning. Health and safety issues for microwave power transmission, John M. Osepchuk, Solar energy Vol. 56, 1996 The results of NASA Fresh look at the feasibility of Space Solar Power, John C. Mankins, 1997. Nicola Tesla. The transmission of electrical energy without wires. Electrical World and Engineer, March 1905. Sang, L. C. K. , A. Celeste, and J-D. L. S. Luk, â€Å"A Point-to-Point Terrestrial Wireless Power Transportation Using an Injection-Locked Magnetron Array†, Proc. of Millennium Conference on Antennas amp; Propagation, 2000, p. 87 Tahir, I. , A. Dexter, and R. Carter, â€Å"Phase Locked magnetrons by use of their pushing characteristics†, Proc. of Sixth International Vacuum Electronics Conference IVEC2005, 2005, pp. 65-68 Shinohara, N. , T. Mitani, and H. Matsumoto, â€Å"Development of Phase and Amplitude Controlled Magnetron†, Proc. of Sixth Internatio nal Vacuum Electronics Conference IVEC2005, 2005,pp. 61-64 Shinohara, N. , H. Matsumoto, and K. Hashimoto, â€Å"Phase-Controlled Magnetron Developmentfor SPORTS : Space Power Radio Transmission System†, The Radio Science Bulletin, No. 310, Sep. 2004, pp. 9-35 Granatstein, V. L. , P. K. Parker, and C. M. Armstrong, â€Å"Scanning the Technology: Vacuum Electronics at the Dawn of the Twenty-First Century,† Proc. IEEE, vol. 87, 1999, pp. 702–716 Heider, S. , â€Å"The Commercial Space TWTA Market Review and Trends†, Proc. of 1997 ESA Workshop, 1997, pp. 63-68 Sivan, L. , â€Å"Microwave Tube Transmitters – Microwave Technology Series 9-â€Å", Chapman amp; Hall, 1994 Matsumoto, H. , â€Å"Research on Solar Power Station and Microwave Power Transmission in Japan : Review and Perspectives†, IEEE Microwave Magazine, December 2002, pp. 36-45 Wireless Elecricity Essay Example Wireless Elecricity Essay Niharika Sharma Applied Electronics and Instrumentation Engineering, [emailprotected] com Varun Pachauri Electronics and Communication Engineering, [emailprotected] com Wireless Electricity Abstract—The present paper intends to link several disciplines in an attempt to describe the concept of wireless electricity. Wireless transmission is useful in cases where interconnecting wires are inconvenient, unaffordable, expensive, hazardous, unwanted or impossible. A large part of the energy sent out by the generating plant must arrive at the receiver to make the system economical.Some common forms of wireless electricity transmission methods are Direct Induction followed by resonant magnetic induction, electromagnetic radiation  in the form of  microwaves  or  lasers. With this technology we can reduce power losses produced through wired lines. Different concepts and application of wireless power transmission are discussed in this paper. Introduction The definition of Wirele ss Power Transmission is: efficient transmission of electric power from one place to another through vacuum or an atmosphere without the use of wire or any other substance.Maxwells theory of electromagnetism, published in 1865 mentions electromagnetic waves moving at the speed of light, and the conclusion that light itself was just a wave. In 1886 H. Hertz performed an experiment with pulsed wireless energy transfer. . He produced an apparatus that generated and detected microwaves in the UHF region. Tesla also performed experiments in the field of pulsed wireless energy transfer in 1899. Teslas Magnifying Transmitter, an early type of Tesla Coil that measured 16 meters in diameter, could able to transmit tens of thousands of watts without wires.In present electricity generation system we waste more than half of its resources. The transmission of power without wires may be one idle alternative for electricity. Future suitable and largest application of the WPT via microwave is a Spa ce Solar Power Satellite. History of Wireless Electricity In 1864, James Maxwell predicted the existence of radio waves by means of mathematical model. In 1884, John Poynting realized that the Poynting Vector would play an important role in quantifying the electromagnetic energy.In 1888, bolstered by Maxwells theory, Heinrich Hertz first succeeded in showing experimental prove of radio waves by his spark-gap radio transmitter. The prediction and prove of the radio wave in the end of 19th century was start of the wireless power. The Raytheon Company performed the first successful WPT experiment in 1963. In this experiment power was transmitted with a DC-to-DC efficiency of 13%. The Raytheon Company also demonstrated a microwave-powered helicopter in 1964. In 1975, Jet propulsion lab of NASA carried out an experiment and demonstrated the transfer of 30 kW over a distance of 1 mile.This test demonstrated the possibilities of wireless energy outside the laboratory. Rockwell Internationa l and David Sarnoff Laboratory operated in 1991 a microwave powered rover at 5. 87 GHz. Three kilowatts of energy was transmitted and 500 watts was received. In 1980s, Japanese scientists developed the MPT technologies and research. In 1983 and 1993, Matsumoto’s team carried out the first Microwave Power Transmission experiment in space. The rocket experiment was called Microwave Ionosphere Nonlinear Interaction experiment i. . MINIX in 1983 (Fig. 1) and International Space Year – Microwave Energy Transmission in Space in 1993, respectively. They focused nonlinear interaction in between intense microwave and plasmas. In this experiment, they used cooker-type 800W-2. 47GHz magnetron for microwave transmitter. New wave-wave-particle interaction phenomenon was observed in this experiment. Plasma theory and computer experiments also supported the observations. Figure 1. MINIX Rocket experiment in 1983 Technologies for Wireless ElectricityThe modern ideas are dominated by m icrowave power transmission called Solar power satellite to be built in high earth orbit to collect sunlight and convert that power into microwaves, then beamed to a very large antenna on earth, the microwaves would be converted into conventional electrical energy. A microwave transmission system consists of three essential parts: ? Electrical energy to microwave energy conversion ? Absorption antenna that collects the waves ? (Re)conversion to electrical energy Figure 2. Microwave transmitter and rectennaThe microwave source consists of a microwave oven magnetron with electronics to control the output energy. The output microwave energy ranges from 50 W to 200 W at 2. 45 GHz. A coaxial cable connects the output of the microwave source to coax-to-waveguide adapter. This adapter is connected to a waveguide ferrite circulator which protects the microwave source from reflected energy. The circulator is connected to a tuning waveguide to match the waveguide impedance to the antenna inpu t impedance. The slotted waveguide antenna consists of 8 wave guide sections with 8 slots per section.These 64 slots radiate the energy uniformly through free space to the rectenna. The slotted waveguide antenna is ideal for energy of its high aperture efficiency (;gt;95%) and high power handling capability. A rectifying antenna called a rectenna receives the transmitted energy and converts the microwave power to direct current (DC) power. This rectenna consists of 6 rows of dipoles antennas where 8 dipoles belong to each row. Every row is connected to a rectifying circuit which consists of low pass filters and a rectifier. The rectifier is a Ga As Schottky barrier diode i. . impedance matched to the dipoles by a low pass filter. The 6 rectifying diodes are connected to light bulbs for indicating that the energy is received. The light bulbs also dissipated the received energy. This rectenna has a 25% collection and conversion efficiency, but rectennas have been tested with more than 90% efficiency at 2. 45 GHz. Another possibility is to use highly efficient fibre lasers for wireless energy transmission where the possibilities are similar to microwaves concept but lasers emit energy at frequencies much higher than microwave.For several years NASA, ENTECH, and UAH have been working on various aspects of collection of the laser radiation and conversion to electrical energy for laser wireless energy transmission. Figure 3. Two optical forms of wireless antenna formed of search light beam-ionised atmospheric stream Applications of Wireless Electricity Wireless Power for Space Solar Satellites * The largest application for microwave power transmission is Space Solar Power satellites. In this application, solar energy is captured in space and converted into electricity.The electricity is converted into microwaves and transmitted to the earth. The microwave energy will be captured with antennas and converted into electricity. NASA is still investigating the possibilit ies of solar power satellites. Main problem is the high investment cost due to the space transport. The current rates on the Space Shuttle run between $7,000 and $11,000 per kg of transported material. * Table. 1-Parameters for transmiting antenna for sps system * Figure. 4. Space Solar Power Satellite Power Supply for Rural AreasWireless power can be an option for power supply to rural areas. In 1993, a project presented about wireless power supply in Alaska. Because of limited infrastructure, numbers of small rural communities in Alaska must provide their own electricity. These systems can be expensive or just not available. At the moment, the small communities produce their own power with mostly diesel engines. These produce so noise and pollution. Also the required fuel has to be transported over long distances. This results in an electricity price in excess of $40/kWh.In Alaska cable connections through water is no alternative because of ice. With the help of WPT, the required power production of the communities can be combined. It can reduce noise, pollution and transportation of fuel. WPT may be capable of transmitting electrical power to Alaska’s remote villages. To investigate these possibilities, a project was conducted named Alaska21†. System used for the project consisted of a 2. 46 GHz phased array design. The distances should be bridged are between 1 and 15 miles. Figure. 5. Alaska’21 * V.Merits of Wireless Electricity An electrical distribution system, based on this method would eliminate the need for the costly and capital intensive grid of cables, towers, and substations. The system would also reduce the cost of electrical energy used by the consumer and rid the landscape of wires, cables, and transmission towers. There are areas of the world where the need for electrical energy exists, yet there is no method for delivering energy. Africa is in need of energy to run pumps to tap into the vast resources of water under the Sa hara Desert.Rural areas, such as those in China, require the electrical energy necessary to bring them into the 20th century and to equal standing with western nations. The wireless transmission will solve most of above problems. The electrical power can be economically transmitted without wires to any terrestrial distance, so there will be no transmission and distribution loss. Figure 6. An office using wireless electricity Demerits of Wireless Electricity A common criticism of the wireless power system is regarding its possible biological effects.Calculating the circulating reactive power, it was found that the frequency is small and such a frequency is very biologically compatible. A general perception that microwaves are harmful has been a major obstacle for the acceptance of power transmission with microwaves. One major concern is that the long-term exposure to low levels of microwaves might be unsafe and even could cause cancer. Conclusion The transmission of energy without wi res is not a theory or a mere possibility, it is now a reality. The electrical power can be economically transmitted without wires to any terrestrial distance.Many researchers have established in numerous observations and experiments qualitative and quantitative. It is clear that wireless power transmission systems in the range of 100 W to 100 kW to cannot compete with traditional systems just looking at the costs. At those places where economic competition is not the prime consideration, it can be an option. Microwave wireless energy transmission can supply energy to those places that are difficult to reach. Especially small communities in rural areas could be supplied with power using wireless power transmission.The problems of a possible lack of energy during the next fifty or hundred years could be solved by the Space Solar Power Station. The system would reduce the cost of electrical power used by the consumer and get rid of the landscape of wires, cables, and transmission towe rs. It has negligible drawbacks like reactive power which was found insignificant and biologically compatible. References James O. McSpadden, â€Å" Wireless Power Transmission Demonstration†, Texas Aamp;M University, June, 1997. Elvina Finzi, Carlo Lombardi, and Leopold Summerer. A lunar IPWR: A pre-feasibility study. In IAC 2006, volume IAC-06- D2. 8. , Valencia, Spain, Oct. 2006. IAF. Thomas W. Benson, â€Å"Wireless transmission of power now possible†, News Letter, pp1118 – 9, March, 1920. Charych Arthur (Setauket, NY), â€Å"System and method for wireless electrical power transmission†, Patent No. 6,798,716, September 28, 2004. Joe T. Howell, et. al, â€Å"Advanced receiver / converter experiments for laser wireless power transmission†5th. Wireless transmission conference, pp 1-8, Garanda, Spain, 2004. Nikola Tesla, â€Å"The true wireless†, Electrical Experiment, May, 1919. Toby Grotz,† Wireless transmission of power†, Cour tesy of the Tesla BBS at 719 486-2775, August 28, 1990.Cheney, Margaret (1999), Tesla Master of Lightning. Health and safety issues for microwave power transmission, John M. Osepchuk, Solar energy Vol. 56, 1996 The results of NASA Fresh look at the feasibility of Space Solar Power, John C. Mankins, 1997. Nicola Tesla. The transmission of electrical energy without wires. Electrical World and Engineer, March 1905. Sang, L. C. K. , A. Celeste, and J-D. L. S. Luk, â€Å"A Point-to-Point Terrestrial Wireless Power Transportation Using an Injection-Locked Magnetron Array†, Proc. of Millennium Conference on Antennas amp; Propagation, 2000, p. 87 Tahir, I. , A. Dexter, and R. Carter, â€Å"Phase Locked magnetrons by use of their pushing characteristics†, Proc. of Sixth International Vacuum Electronics Conference IVEC2005, 2005, pp. 65-68 Shinohara, N. , T. Mitani, and H. Matsumoto, â€Å"Development of Phase and Amplitude Controlled Magnetron†, Proc. of Sixth Internatio nal Vacuum Electronics Conference IVEC2005, 2005,pp. 61-64 Shinohara, N. , H. Matsumoto, and K. Hashimoto, â€Å"Phase-Controlled Magnetron Developmentfor SPORTS : Space Power Radio Transmission System†, The Radio Science Bulletin, No. 310, Sep. 2004, pp. 9-35 Granatstein, V. L. , P. K. Parker, and C. M. Armstrong, â€Å"Scanning the Technology: Vacuum Electronics at the Dawn of the Twenty-First Century,† Proc. IEEE, vol. 87, 1999, pp. 702–716 Heider, S. , â€Å"The Commercial Space TWTA Market Review and Trends†, Proc. of 1997 ESA Workshop, 1997, pp. 63-68 Sivan, L. , â€Å"Microwave Tube Transmitters – Microwave Technology Series 9-â€Å", Chapman amp; Hall, 1994 Matsumoto, H. , â€Å"Research on Solar Power Station and Microwave Power Transmission in Japan : Review and Perspectives†, IEEE Microwave Magazine, December 2002, pp. 36-45

Everything You Need to Know About Bleach

Everything You Need to Know About Bleach Bleach is the common name for a solution of 2.5%  sodium hypochlorite in water. Its also called chlorine bleach or liquid bleach. Another type of bleach is oxygen-based or peroxide bleach. While you may know bleach is used to disinfect and remove stains, there is more to know about this everyday chemical to use it safely and effectively. Here are some important facts about this solution. Useful Bleach Facts Bleach has a shelf life and expiration date. On average, a container of unopened bleach loses 20% of its effectiveness each year. Once opened, bleach starts to lose a significant amount of its power after 6 months.Chlorine bleach is more effective as a disinfectant when its diluted rather than if its used at full strength. A typically recommended dilution is 1 part bleach to 9 parts water.A higher percentage of bleach is needed if a large quantity of organic material (e.g., blood, protein) is present, as these materials react with bleach and tend to neutralize it.If you add sodium hypochlorite bleach to whiten laundry or remove stains, its better to add it after the wash cycle has already filled with water and started agitation. If you add bleach together with detergent, you risk diminishing the effectiveness of enzyme-based stain removers and the detergent. On the other hand, oxygen-based bleach is best added to warm or hot water before clothes are added. Oxygen-based bleaches are g enerally color-safe and will preserve whiteness, but will not remove color. Sodium hypochlorite bleach does whiten fabrics ​but is not safe for all materials. Bleach reacts with several other chemicals to release toxic vapors. Its generally inadvisable to mix bleach with other cleaners. In particular, avoid mixing bleach with acetone, alcohol, vinegar  or other acids, or ammonia.Bleach can corrode metal, so if you clean or disinfect a metal surface with bleach, its important to wipe it down with water or alcohol afterward.Although its commonly believed drinking bleach can lead to a negative blood or urine test for drug use, this is untrue.While chlorine bleach is a powerful disinfectant, peroxide bleach is not suitable for this purpose. Chlorine bleach disinfects because it is an oxidizer, capable of disrupting microbial cells. Oxidation is also how chlorine bleach removes color. Sodium hypochlorite breaks bonds in the chromophore or colored portion of a molecule, rendering it colorless. Reducing bleaches also exist, which also change chemical bonds and alter how a molecule absorbs light.Chlorine bleach was first used to disinfect water in 1895 for  New York Citys Croton Reservoir. Household bleach may be made using water, caustic soda, and chlorine. The process of electrolysis is used to produce chlorine and caustic soda by running an electric current through a solution of table salt (sodium chloride) in water. Caustic soda and chlorine react to form sodium hypochlorite. All that is needed is to bubble chlorine gas through caustic soda solution. Since chlorine gas is toxic, bleach is not a chemical one should make at home.Although the odor of chlorine is apparent in bleach, when bleach is used, the chemical reaction tends to produce salt water and not chlorine gas.Although the toxic chemical dioxin has been known to occur in bleaching products using in the wood pulp and paper industry, household bleach is free from dioxin because gaseous chlorine must be present for dioxin to form.

Psychology Essay Example | Topics and Well Written Essays - 750 words - 15

Psychology - Essay Example This model of memory remained under extensive research in the following years. The physical growth in size of cerebrum and the number of functions associated with this evolved cerebrum demonstrates an important step in the evolutionary ladder of natural life. Memory is one of the very complicated functions of complex life forms and this complexity reaches its maximum when Homo sapiens are analyzed. Atkinson-Shiffrin model of memory is an attempt to explain the various processes of memory which continue to operate in our brains. The first level of memory is identified as sensory memory. No matter which kind of stimulus is applied to the various senses of the body, the form of information that is delivered to the central nervous system is in the form of electrical impulse or the so called ‘nerve impulse’. For the purpose of translation of external stimuli, a number of receptors are present in the body, that continuously receive impulses in the form of vibration, sound, pressure, light and so on. These impulses are translated into electrical nerve impulses by their respective receptors and are then delivered to the brain as electrical signals. This sensory memory has a very short life span and it persists for only a few seconds i.e 2-3 seconds. The stage between sensory memory and long term memory is called short term memory. Certain chunks of information from sensory memory are shifted to short term memory which is also called working memory because the information stored there needs further processing. Short term memory easily fades away as soon as attention is drawn to any other matter; it lasts for only 18 to 20 seconds unless the information is rehearsed. Any information that is not lost after 18 to 20 seconds is transferred to long term memory. The capacity of short-term memory is limited and it is for this reason that only a small amount of information can be retained in short-term memory

History - United States History 1865 Essay Example | Topics and Well Written Essays - 750 words

History - United States History 1865 - Essay Example Expansion of Cuban sugar industry had then brought a measure of prosperity and a dwindling of the independent movement. But a change in American tariff policies in 1894 affected the Cuban sugar market and brought hard times, unemployment and a renewal of hostilities in early 1895. Spanish government sought to introduce reforms in Cuba on the diplomatic demand of U.S, just when the controversy seemed to be quieting and the U.S battleship 'Maine' was sunk. Despite frantic Spanish efforts to prove that the Spanish government had no part in the sinking, and new diplomatic concession, the U.S Congress started the demand of Spain quitting the island altogether. War was the result. Throughout the nineteenth century U.S had pursued the policy of expansion. But as a new industrial America emerged it started its journey to become the new world power after the war. The country's interest in international affairs steadily grew. Friendly relations with Japan and trade with China was increased to the point when Open Door Policy 1899 was presented as a means of keeping China's trade open to all comers. Later U.S, along with Britain, Germany, France, and Japan entered into a world-wide race for power. Viewed in the long perspective, the Spanish American War was but one incident in a series of events which marked this arrival of United States as a world power. The years between 1865 a... There were many industrial revolutionary inventions like sewing machine, steel plow, telegraph, light bulb, telephone and many more, which made the U.S. boom in the international market. As America was on its path to become the world power, it introduced the method of mass production in the country. America was a rich continent for the aggressive and ingenious to master. Between 1865 and 1880 the national wealth doubled and by 1900 it became massive. The nation's iron ore, its oil, its lumber, and its western agricultural lands were sources of yet untapped wealth. Its people, who by and large admired the successful enterprise, eagerly provided investments and speculative capital. Only then it became clear that the dynamic capitalism of an expanding America, seizing upon unparalleled natural resources and utilizing the new machines of the industrial revolution, had transformed the national economy. There were 140,000 industries of all types in 1860 and by 1880, there were 250,000. In 20 years the employee double and labor force got strong. Estimated wealth in 1865 was 20 billion while in 80's it was 43 billion. Bank deposits tripled between 1865 and 1880. The inflation rate between 1880 and1890 was below 5 percent, which resulted in deduction of the tax rate. There were many ups and downs during this time period but it was not enough to become a hurdle in America way in becoming a world power. 3. Discuss the problems associated with the Industrial Revolution and how the people reacted. Include in your discussion the Populists and the Progressives. The United States, as a powerful force in the modern era of industry and world commerce, henceforth was to be an important participant in world affairs. There