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Fractal RFID Antenna Miniaturization
113,00 CHF *
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Recently, there has been increasing interest in pushing the operating frequency of RFID systems toward microwave frequencies (5.8 GHz) to make use of the ISM band. This work addresses the design of miniaturized fractal antennas for this application. Different fractal antennas based on aperture-coupled feeding technique are studied, analyzed and compared for size reduction, low profile, and good omnidirctional patterns. Further, a new design methodology for miniaturizing fractal RFID antennas is introduced which uses particle swarm optimization technique, implemented in MATLAB, and CST Microwave Studio which is an electromagnetic simulator based on finite integration technique. The design methodology is applied to different fractal antennas such as Minkowski slot , Koch slot, and Minkowski aperture-coupled antennas. The methodology is also used to design a miniaturized fractal antenna having approximately perfect impedance matching with the tag chip. The design does not need any additional loading or matching network and hence yields relatively lower cost and smaller antenna area compared with conventional tag antenna systems.

Anbieter: Orell Fuessli CH
Stand: 06.12.2019
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Khan, D: Vulnerability of Low Cost Masonry Buil...
59,00 € *
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Erscheinungsdatum: 07/2010, Medium: Taschenbuch, Einband: Kartoniert / Broschiert, Titel: Vulnerability of Low Cost Masonry Buildings to Earthquakes, Titelzusatz: Cost Effective Construction Technique, Autor: Khan, Dr. Iqbal Khaleel // H. Abbas, Dr., Verlag: LAP Lambert Acad. Publ., Sprache: Englisch, Rubrik: Bau- und Umwelttechnik, Seiten: 148, Informationen: Paperback, Gewicht: 239 gr, Verkäufer: averdo

Anbieter: averdo
Stand: 06.12.2019
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Electrical Confinement for the Crystalline Sili...
35,80 € *
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Crystalline silicon thin-film solar cells have the potential to drastically reduce the cost for silicon solar cells. The aim of the work described in this book was to improve the quality of thin silicon layers on foreign substrates and to apply the experience gained hereby to various low-cost substrates. Two aspects of the crystalline silicon thin-film solar cell were examined intensively to reach this goal: diffusion barrier properties of common intermediate layers, and zone-melting recrystallisation of silicon layers. For investigation of diffusion barrier layers, the focus was set to diffusion of the transition metals iron, chromium and vanadium in the intermediate layer materials SiO2 and SiNx deposited by plasma-enhanced chemical vapour deposition. Temperatures ranging from 900C to 1350C were applied to the samples. Zone-melting recrystallisation of silicon is an important technique to prepare large crystal grains of several millimetres width and several centimetres length on amorphous substrates. Parameter studies on SiO2-capped multicrystalline silicon wafers were done to investigate the effect of the so-called supercooled zone on crystal quality. One-side contacted solar cells were prepared on optimised layers on such model substrates. For the first time, also low-cost ribbon silicon and ceramics (SiSiC, Si3N4, SiAlON, mullite) were tested as substrate material. Cell efficiencies up to 10.5% could be obtained when using these materials. The author: Dr. Stefan Reber studied Physics at the Technical University of Darmstadt, Germany. He joined the solar cell department of the Fraunhofer Institute for Solar Energy Systems for his Ph.D. thesis, where he was in charge of improving crystalline silicon thin-film solar cells on foreign substrates.

Anbieter: Thalia AT
Stand: 06.12.2019
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Electrical Confinement for the Crystalline Sili...
51,90 CHF *
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Crystalline silicon thin-film solar cells have the potential to drastically reduce the cost for silicon solar cells. The aim of the work described in this book was to improve the quality of thin silicon layers on foreign substrates and to apply the experience gained hereby to various low-cost substrates. Two aspects of the crystalline silicon thin-film solar cell were examined intensively to reach this goal: diffusion barrier properties of common intermediate layers, and zone-melting recrystallisation of silicon layers. For investigation of diffusion barrier layers, the focus was set to diffusion of the transition metals iron, chromium and vanadium in the intermediate layer materials SiO2 and SiNx deposited by plasma-enhanced chemical vapour deposition. Temperatures ranging from 900C to 1350C were applied to the samples. Zone-melting recrystallisation of silicon is an important technique to prepare large crystal grains of several millimetres width and several centimetres length on amorphous substrates. Parameter studies on SiO2-capped multicrystalline silicon wafers were done to investigate the effect of the so-called supercooled zone on crystal quality. One-side contacted solar cells were prepared on optimised layers on such model substrates. For the first time, also low-cost ribbon silicon and ceramics (SiSiC, Si3N4, SiAlON, mullite) were tested as substrate material. Cell efficiencies up to 10.5% could be obtained when using these materials. The author: Dr. Stefan Reber studied Physics at the Technical University of Darmstadt, Germany. He joined the solar cell department of the Fraunhofer Institute for Solar Energy Systems for his Ph.D. thesis, where he was in charge of improving crystalline silicon thin-film solar cells on foreign substrates.

Anbieter: Orell Fuessli CH
Stand: 06.12.2019
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A Low-Cost Approach to PCR
105,90 CHF *
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The polymerase chain reaction (PCR) is a technique used to replicate specific pieces of DNA millions of times, which permits the detection and analysis of minute amounts of nucleic acids. Since its introduction in the late 1980s, this technique has been applied not only in molecular biology research but also in fields as diverse as anthropology, phylogeny, and forensics. However, despite the large impact of PCR, many of its applications remain within the confines of research and the academic environment. Now, in A Low-Cost Approach to PCR: Appropriate Transfer of Biomolecular Techniques, Dr. Eva Harris makes this elegantly simple technique more accessible to researchers, physicians, and laboratory workers throughout the world. She provides a description of the theoretical basis of the technique, the practical details of the method, and the philosophy behind the technology transfer program that she developed over the last ten years. The book serves as a guide for potential users in developing countries and for scientists in developed countries who may wish to work abroad. In addition, the low-cost approach outlined in this book can be useful for high school, undergraduate, or continuing education programs in the United States. While the specific applications of PCR outlined in the book are immediately useful to the study of infectious diseases, the approach presented can be generalized to a number of other technologies and situations. The book will help laboratories in many areas of the world generate information on site for use by physicians, epidemiologists, public health workers, and health policy professionals to develop new strategies for disease control.

Anbieter: Orell Fuessli CH
Stand: 06.12.2019
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A Low-Cost Approach to PCR
91,49 € *
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The polymerase chain reaction (PCR) is a technique used to replicate specific pieces of DNA millions of times, which permits the detection and analysis of minute amounts of nucleic acids. Since its introduction in the late 1980s, this technique has been applied not only in molecular biology research but also in fields as diverse as anthropology, phylogeny, and forensics. However, despite the large impact of PCR, many of its applications remain within the confines of research and the academic environment. Now, in A Low-Cost Approach to PCR: Appropriate Transfer of Biomolecular Techniques, Dr. Eva Harris makes this elegantly simple technique more accessible to researchers, physicians, and laboratory workers throughout the world. She provides a description of the theoretical basis of the technique, the practical details of the method, and the philosophy behind the technology transfer program that she developed over the last ten years. The book serves as a guide for potential users in developing countries and for scientists in developed countries who may wish to work abroad. In addition, the low-cost approach outlined in this book can be useful for high school, undergraduate, or continuing education programs in the United States. While the specific applications of PCR outlined in the book are immediately useful to the study of infectious diseases, the approach presented can be generalized to a number of other technologies and situations. The book will help laboratories in many areas of the world generate information on site for use by physicians, epidemiologists, public health workers, and health policy professionals to develop new strategies for disease control.

Anbieter: Thalia AT
Stand: 06.12.2019
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Sartape, Ashish: Adsorption Technique For Remov...
79,59 € *
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Medium: Taschenbuch, Einband: Kartoniert / Broschiert, Titel: Adsorption Technique For Removal Of Dyes And Heavy Toxic Metals, Titelzusatz: Removal Of Dyes And Heavy Toxic Metals With Adsorption Technique Using Low Cost Adsorbents, Autor: Sartape, Ashish // Kolekar, Sanjay, Verlag: LAP Lambert Academic Publishing, Sprache: Englisch, Rubrik: Chemie // Populäre Darstellungen, Seiten: 396, Informationen: Paperback, Gewicht: 606 gr, Verkäufer: averdo

Anbieter: averdo
Stand: 06.12.2019
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Phase Inverter Circuit
44,99 € *
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This differential potentiometric technique is based upon the invention of a new simple electronic RC filter circuit capable of yielding analytical results of high accuracy and precision in addition to having the obvious advantages of very low cost and ease of operation over the earlier conventional and complicated differentiator circuits. The technique has the potential of application to other types of potentiometric estimations such as compleximetry and redox titrimetry.

Anbieter: Thalia AT
Stand: 06.12.2019
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Wax on Gourds: Decorative Techniques for Transf...
25,99 € *
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Gourds offer great surfaces to decorate, and this step-by-step book reveals the design boost you can give your gourd projects by using crayons as an economical source of wax. With over 340 detailed photographs, in her popular how-to style Miriam Joy explains the inexpensive materials needed and the basic steps of the low-cost, high-impact wax design technique. Next are step-by-step instructions for four examples of creative wax-technique designs on gourds, plus four stunning rim treatments. By using these as your starting point, you can create unlimited gourd art works of your own -- all featuring low-cost, high-impact wax design technique. Projects range from the 'Midnight Fern' gourd with a crocheted beaded ruffle, to the colourful 'Flowers in the Jungle' gourd with a simple shell rim, to the 'Blue Horizons' gourd featuring a unique coiled Arrowhead Points rim. Plus, using wax, learn how to make faux stones to decorate any project.

Anbieter: Thalia AT
Stand: 06.12.2019
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