Proposed Sun Tracking System

Proposed Sun Tracking System Abstract Introduction The basic design of a solar thermal power generation system is as shown in the figure. In such a system, the major components are the solar energy concentrator, sterling engine and the dynamo (alternator) unit. A parabolic dish reflector acts as the concentrator in this system. To achieve a good performance from a solar thermal conversion engine, it should be exactly mounted on a place where maximum heat transfer is possible. It is the center or the focal point of the parabolic reflector surface. Then only the engine receives the maximum amount of solar thermal energy, which will be converted into kinetic energy and then to electricity. There are two possible configurations for the placement of the sterling engine depend on the surface type of the reflector. They are known as prime focus configuration and the offset focus configuration. Because of the position of the sun changes according to the rotation of earth, the parabolic surface has to be focused to the direction of the sun at all the times. The proposed solar tracking system consists of hardware and software to achieve following capabilities Localization The position of the Sun in a given time can be calculated using mathematical equations based on the time, location, altitude and few other factors. To perform such a calculation, the exact location of the device should be known. Since this device is not mounted on a mobile configuration, it is not hard to find the exact location with help of a map or a GPS device after install in the field. But it is more convenient to use an embedded GPS receiver with this system. This will eliminate the requirement of initial setup and it also capable of providing the precise UT timestamp based on the synchronized satellite clocks. It makes this device a location independent and time independent high precision solar tracking mechanism. NREL Solar position algorithm (SPA) Several methods and algorithms to calculate the position of the sun has been published in the literature of the solar research, but most of them were not precise enough because their uncertainties have been greater than  ± 0.01. Reda and Andreas implemented a new algorithm which is capable of estimate the position of the sun with uncertainties of  ±0.0003 and well known as solar position algorithm (SPA) by National Renewable Energy Laboratory (NREL). Feedback loop mechanism MPU 9250 IMU In this solar tracking system, orientation of the reflector surface is precisely controlled and maintained by a closed loop control system. Therefore this system should consist of a feedback mechanism to obtain the current orientation of the reflector as the feedback input of the control loop. There are several methods to fulfil this requirement. For example, a read reckoning based method such as a rotary encoder with a known reference point can be used per each axis. But since it increases the mechanical complexity of the system there is a very higher chance of causing mechanical failures and sensor issues. To eliminate this problems while keeping the accuracy in a higher level, a micro electro mechanical systems (MEMS) [] based implementation is suggested. Among the advantages of this kind of devices less power usage, high accuracy, fast response, less complexity and the minimal space requirement are mostly highlighted in this application. Inertia Measuring Units (IMU) are very popular in the fields of mobile devices, game controllers, drone flight control systems and self-balancing toys because they provide the angular position coordinates (Yaw Pitch and Roll) in a very higher sample rates. They are also accurate enough to balance and guide a wireless controlled drone in a very high level of accuracy even in the industrial electromagnetic noise and interference. This devices are normally consist of a gyroscope, and accelerometer and a magnetic compass. To ensure the maximum accuracy in all directions, it is recommended to use 3 axis devices. Theoretically we can say that with the only help of a gyroscope, it is possible to calculate the angular orientation in Euler coordinates, but the problem of using a single device is it may generate very much of error when continuously using in long time periods. It is commonly known as the gyroscope drift. This can be compensated by using a secondary device which corrects the dri ft and it is the accelerometer. This combined sensor based approach is commonly described as sensor fusion. There are several sensor fusion algorithms available in the industry such as Karlmann filter and the complementary filter. In this research, Karlmann filter based algorithm has been used. With the both accelerometer and the gyroscope sensors, now we can accurately calculate the Euler angles of the reflector when the IMU is placed near the focus point of the Parabola. The offset values can be preconfigured to match the exact difference between the sensor position and the focal point. But we need one more reference point to convert this coordinates into altitude and azimuth vectors. It is the north direction and can use a magnetic compass to obtain this parameter. But it also need a very much higher level of calibrations due to the magnetic field variations depend on the situations and the locations. In this research, the nine axis MPU 9250 has used. It is an integrated chip with 3 axis MEMS gyroscope, 3 axis MEMS accelerometer and a 3 axis magnetic compass. It has a 16bit RAW data outputs on each axis and therefore a very high accuracy is obtained.

Learning Community Essay

Nowadays the popularity of online learning is swiftly increasing and more students prefer distance learning to traditional as it offers certain benefits. Walden University offers students opportunities to receive highly-qualified education and to save time on other important things as job, families, etc. What is Walden University? Walden University is an accredited institution which provides engaging learning experience both for professionals and non-professionals. The mission of the University learning community is to attract extraordinary students and to make positive social impact. Learning Community is represented by diverse and vibrant faculty and dedicated students. Faculty members are able to enrich online learning community offering wide range of experiential and educational backgrounds. All members are gifted mentors and highly-talented teachers who are fully committed to University’s core values and mission – to provide educational accesses, social change and professional excellence. Moreover, members of learning community teach the values of integrity and quality. Students of learning community are mid-career professionals who are willing to gain professional achievement and to remain dedicated to lifelong learning. All students are allowed to exchange their ideas and to share diverse perspectives with other faculty members, as well as with fellow students nationwide. It becomes apparent that relationships within community are professional and, at the same time, friendly-oriented. Further, faculty and staff at Walden University will help to balance education with professional and personal commitments. Essential resources are available for mastering skills: Writing Center, world-class library, tutoring, etc. Scholar-practitioners develop all degree programs and they continually visit courses to make sure they possess all modern updates relevant to profession chosen. Learning community offers also international perspective. Every student becomes a member of international community with more than 270,000 members online. More than 50 campuses are in 16 countries. Every student may enter the Laureate International Network and to be provided with excellent opportunity to expand international viewpoint and to apply obtained knowledge to professional life. The most important moment to admit is that Walden University learning community strongly believes that knowledge is the most valuable as it is the most effective way work for greater good. In other words, Walden University calls for social changes. Students and faculty members are willing to improve social and human conditions. They create ideas how to promote individual development, as well as development of organizations, communities and society as a whole. The goal of learning community is to help students to become scholar-practitioners and to conduct scholarly researches in the chosen field. The mission is to provide diverse learning community with friendly-oriented relations and with the opportunity to become scholar-practitioners. It is necessary to underline that learning community of Walden University has influenced both my professional life and the life of the whole society as Walden University promotes the values of knowledge, integrity, quality, honesty and fairness which are the most important in contemporary world. I can apply knowledge not only to critical societal challenges, but also to advance the greater good and social relations. I really appreciate the Walden University offers entirely online courses as it offers certain benefits for me. To be a member of society means being concerned with everyday human relations, emotions and interpersonal skills and Walden learning community gives such a chance. Financial benefits of online courses are ability to save money spent on housing, transportation and food and ability to keep part-time as well as full-time job at the same time. Walden University gives and excellent opportunity to be involved into interactive teamwork between students’ groups i. e. ability to correspond with other students from different parts of the world. Walden University offers modern way of learning which gives an opportunity to master skills and to save time on family, friends and job. References Online Degree: About Walden University. Retrieved June 10, 2008, from http://info. waldenu. edu/aboutwalden. php Walden University: Official Website. Retrieved June 10, 2008, from http://www. waldenu. edu/ Walden University: Online Degree Programs. Retrieved June 10, 2008, from http://www. worldwidelearn. com/waldenu/index. php

Company’s Marketing Strategy

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After the September 11th terrorist attack on the World...

After the September 11th terrorist attack on the World Trade Centre by the Islamic radical group al-Qaeda and the 2001 Anthrax attacks on two senators and several news media offices, congress rushed to pass the USA Patriot Act, which roughly is an Act to deter and punish acts of terrorism in the United States and around the world, to enhance law enforcement investigatory tools, and for other purposes. After these unrelated terrorist attacks happened within weeks of each other congress knew reform legislature was needed. Many Historians such as Brett Rubio believe that the USA Patriot Act infringed upon American’s civil liberties while the U.S. Government more specifically the Justice Department believed it was necessary course of action†¦show more content†¦The act also gives federal judges the authority to issue search warrants that are valid in the judge’s district as well as outside the judge’s jurisdiction. Before the Patriot Act, if an agent wante d to search a suspect’s email, he or she had to get a separate warrant in each district the subject’s Internet Service Provider (ISP) appeared in in order to search the suspect’s email. As the FBI Director continued in his speech to congress â€Å"this frustrating and time-consuming process can be averted without reducing judicial oversight.†(FOOTNOTE 1) The time that used to be spent seeking multiple warrant for each district is now being used more productively to investigate terrorists, and preventing attacks from happening. Thirdly the Patriot Act has allowed the Department of Justice agencies able to fight a 21st century battle against terrorism with 21st century tools. The Patriot Act approves the usage of roving wiretaps, court ordered pen registers, and trap and trace devices to track internet communications to name a few. Focusing on the roving wiretaps Mueller said, â€Å"it is standard operating procedure for terrorists to rapidly change locat ions and switch cell phones to evade surveillance.† (FOOTNOTE 1). The roving wiretap allows to agents to track terrorists through several phones even if they are constantly changing to avoid beingShow MoreRelatedInternational Terrorism - the Worlds Greatest Challenge Today?680 Words   |  3 PagesToday Today the threat of terrorism is becoming more and more serious. Terrorism is considered the greatest threat against the safety of the world, and especially the USA, today. The extent of the terrorism has increased significantly over the last couple of years, since the terrorist attacks against the US on the 11th of September 2001. After these attacks former president of the US, George Bush declared a war against terrorism. 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