A method to calculate inductance in systems of parallel wires

This paper gives a method that maps the static magnetic field due to a system of parallel current-carrying wires to a complex function. Using this function simplifies the calculation of the magnetic field energy density and inductance per length in the wires, and we reproduce well-known results for this case

Recent developments in photovoltaic energy by ERDA/NASA-LeRC

Application development activities were designed to stimulate the market for photovoltaics so that as costs are reduced there will be an increasing market demand to encourage the expansion of industrial solar array production capacity. Supporting these application development activities are tasks concerned with: (1) establishing standards and methodology for terrestrial solar cell calibration; (2) conducting standard and diagnostic measurements on solar cells and modules; and (3) conducting real time and accelerated testing of solar cell modules and materials of construction under outdoor sunlight conditions

Watch Your Back! How the Back Pain Industry is Costing Us More and Giving Us Less - And What You Can Do to Inform and Empower Yourself in Seeking Treatment

[Excerpt] This book considers what we know about treatments for back pain and asks a number of critical questions. Are some of the most popular treatments really effective? Do they “cure” or even improve the problems they claim to address? If some back pain treatments are ineffective or even harmful, why do patients clamor for them and doctors provide them? Who benefits from the vast back pain industry that’s developed over the past thirty years? Is it patients? Or the doctors, hospitals, and man­ufacturers that produce the technology of back pain therapy? What does all this say about our medical system? Or our efforts to enhance quality, improve safety, and reduce health care costs? How can patients maneuver to help themselves rather than help the medical industry? Will efforts to measure patient satisfaction help deliver safer and more effective treatments or encourage the opposite? In answering these questions, this book does more than describe and analyze the back business. It also explores the complex ways that doctors interact with patients, drug companies, and medical device makers. The results can inadvertently lead to treatments that are inef­fective or even harmful

Photovoltaic test and demonstration project for the National Photovoltaic Conversion program

Proposed are photovoltaic system tests and demonstrations covering a wide range of applications in order to develop low cost photovoltaic cells suitable for terrestrial applications. Program objectives are: (1) tests and model system demonstrations; (2) device performance and diagnostics; and (3) endurance of solar cell modules and arrays

Solar photovoltaics: Stand alone applications

The Lewis Research Center involvement in space photovoltaic research and development and in using photovoltaics for terrestrial applications is described with emphasis on applications in which the normal source of power may be a diesel generator, batteries, or other types of power not connected to a utility grid. Once an application is processed, technology is developed and demonstrated with a user who participates in the cost and furnishes the site. Projects completed related to instruments, communication, refrigeration, and highways, are described as well as warning systems, weather stations, fire lookouts, and village power systems. A commercially available photovoltaic powered electric fence charger is the result of Lewis research and development

Accessories for You

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