Saha h (74 resultados)

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Paperback. Condición: new. Paperback. Reduction of optical losses in both mono and multicrystalline silicon solar cells by surface texturing is one of the important issues of modern silicon photovoltaics. Texturing of the front surface of silicon solar cells has been modeled and analysed with reference to the reduction in reflection co-efficient and increase in optical trapping. Significant enhancement in open circuit voltage and short circuit current has been achieved through such texturing of the front surface of mono-silicon solar cells. A proper optimisation of texture angle appears to be important for the best performance of the solar cells. An alternative way of reducing the surface reflection and enhancement of the cell parameters is to produce to passive front surface porous silicon layer. An analysis of the characteristics of a porous silicon layer shows that the morphology of the layer is an important design parameter. To realise the structures in practice, several methods are available, but many of this method are either not cost effective or commercially non available.In order to achieve good uniformity of pyramidal textured structure of the silicon surface, a mixture of NaOH/KOH and isopropyl alcohol (IPA) is generally used for texturization of mono crystalline solar cells. However, due to high cost of IPA, there is always search for alternative source. This source should not only be cost effective but should also result in reduced interfacial energy between silicon and ionised electrolyte chemical solution to achieve sufficient wet-ability for the silicon surface in order to enhance pyramid nucleation. Different novel texturization techniques for monocrystalline silicon are descried in this chapter including solar cells performance. For multicrystalline silicon (mc-Si) solar cells, the standard alkaline solution of NaOH/KOH does not produced textured surface of good quality so as to give satisfactory open circuit voltage and efficiency. This is because of grain boundary delineation with step formed between successive grains of different orientations. Different novel texturization techniques for multicrystalline silicon are also included in this book including solar cells performance. Reduction of optical losses in both mono and multicrystalline silicon solar cells by surface texturing is one of the important issues of modern silicon photovoltaics. This book discusses different novel texturization techniques for monocrystalline silicon including solar cells performance. Shipping may be from multiple locations in the US or from the UK, depending on stock availability.…

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Paperback. Condición: New. Print on Demand. This book presents a unique proposal for managing food supplies in mental institutions during wartime. In the wake of World War I, the author found that the health and well-being of patients were suffering due to inadequate nutrition. The author argues that a well-balanced diet is not only essential for the physical health of patients but also contributes to their mental and emotional well-being. They develop a comprehensive dietary plan that emphasizes the importance of providing adequate calories and nutrients, while minimizing the intake of processed foods and sugary drinks. The book delves into the challenges and opportunities of providing nutritious meals within the constraints of wartime rationing. The author offers practical advice on how to grow and preserve food, as well as how to make the most of available resources. The proposal outlined has significant implications for the care and treatment of mental illness, demonstrating that nutritional well-being is inextricably linked to overall health. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item.…

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Hardbound. Condición: As New. New. Contents Preface. I. Technology transfer for aquaculture extension 1. Technology transfer a theoretical framework/Jayanta Kumar Sharma. 2. Changing perspectives of rural aquaculture/Radhey Shyam. 3. Research extension farmer linkage for sustainable aquacu 206 pp.

paperback. Condición: New. Language:English.Paperback. Pages Number: 258 Publisher: Peking University Health Science Publishing Club Pub. Date :2006-05-01. Master Medicine is a series of core texts for medical students. Each volume includes core information on a subject and a wide variety of self-assessment exercises. with full answers. Taken together. the volumes in the Master Medicine series provide students with a complete package of core texts for self-directed learning and exam revision. Contents: Using this book1.…

Pp. Condición: Gut. 252 S.; 21 cm gebraucht, guter Zustand, 56j ISBN: 9783293003361 Sprache: Deutsch Gewicht in Gramm: 388.

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Paperback. Condición: new. Paperback. Reduction of optical losses in both mono and multicrystalline silicon solar cells by surface texturing is one of the important issues of modern silicon photovoltaics. Texturing of the front surface of silicon solar cells has been modeled and analysed with reference to the reduction in reflection co-efficient and increase in optical trapping. Significant enhancement in open circuit voltage and short circuit current has been achieved through such texturing of the front surface of mono-silicon solar cells. A proper optimisation of texture angle appears to be important for the best performance of the solar cells. An alternative way of reducing the surface reflection and enhancement of the cell parameters is to produce to passive front surface porous silicon layer. An analysis of the characteristics of a porous silicon layer shows that the morphology of the layer is an important design parameter. To realise the structures in practice, several methods are available, but many of this method are either not cost effective or commercially non available.In order to achieve good uniformity of pyramidal textured structure of the silicon surface, a mixture of NaOH/KOH and isopropyl alcohol (IPA) is generally used for texturization of mono crystalline solar cells. However, due to high cost of IPA, there is always search for alternative source. This source should not only be cost effective but should also result in reduced interfacial energy between silicon and ionised electrolyte chemical solution to achieve sufficient wet-ability for the silicon surface in order to enhance pyramid nucleation. Different novel texturization techniques for monocrystalline silicon are descried in this chapter including solar cells performance. For multicrystalline silicon (mc-Si) solar cells, the standard alkaline solution of NaOH/KOH does not produced textured surface of good quality so as to give satisfactory open circuit voltage and efficiency. This is because of grain boundary delineation with step formed between successive grains of different orientations. Different novel texturization techniques for multicrystalline silicon are also included in this book including solar cells performance. Reduction of optical losses in both mono and multicrystalline silicon solar cells by surface texturing is one of the important issues of modern silicon photovoltaics. This book discusses different novel texturization techniques for monocrystalline silicon including solar cells performance. Shipping may be from our Sydney, NSW warehouse or from our UK or US warehouse, depending on stock availability.…

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paperback. Condición: New. Language:Chinese. Binding:paperback.

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Condición: Hervorragend. Zustand: Hervorragend | Seiten: 392 | Sprache: Englisch | Produktart: Bücher | This book is a compendium of the proceedings of the International Conference on Applied Analysis, Computation, and Mathematical Modelling in Engineering (AACMME-2021). The book covers a variety of applications such as mechanical, acoustical, physical, electrical, bio-mathematical, and computational fluid dynamics. Since mathematical modeling necessitates a wide range of skills and methods, the book concentrates on techniques that will be of specific interest to engineers, scientists, and those who work with discrete and continuous systems models. This book guides students, researchers, and professionals through the new approaches, the powerful tools for quickly mastering the most popular mathematical and computational models used in engineering and science. These new approaches enable readers to not only systematically create effective models, but also extend these models to any macroscopic physical structure.…

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