Garg Centre of Energy Studies Indian Institute of Technology Hauz Khas, New Delhi 110 016 India Heating of water using solar energy is not new and by using a little science and technology in it, the solar energy can be utilized more effectively and economically for heating the water both for domestic and industrial applications. Solar Water Heaters are popular for the last three decades in countries like USA, Australia, Israel, Japan, India. This is the only solar energy application which is commercially, technic­ ally and economically viable and has been studied for more than 30 years in many countries. Technical advances in solar water heating have been very rapid in the last 30 years. These are becoming popular not only for domestic use but for large establishments like hostels, hotels, hospitals, industries such as Textile, Paper and Food Processing and even in heating of swimming pools in winter. In few instances the cost of solar water heating systems may be higher than those operated by electricity, gas or other fuel but over a period of time this is more than recovered by the savings in the cost of operations and maintenance.

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The information available on all the renewable energy sources indicates that the total potential is only around. Sukhatme is in the Mechanical Engineering Department, Indian. Institute of. For more details, the reader is referred to. Survey/pdfs/tab97.pdf and www.censusindia.gov.in (accessed on. 5 July 2011).

Solar Cells, 9 (1983) 359 359 Book Renew Solar Cell Devices Physics by Steven J. Fonash; published by Academic Press, London, March 1982; 332 pp; price, £23.20; ISBN 0-12-261980-3 There are n o w quite a n u m b e r o f b o o k s on various aspects of solar cells, b u t this b o o k b y Fonash will be particularly welcomed b y research students and others entering the field. The b o o k developed from a course for graduate students and this is reflected in the layout. After a brief discussion of solar energy and photovoltaic conversion, the author develops the basic physics required to understand solar cells. Single-electron band theory, optical absorption and carrier generation, recombination and trapping are all developed at a b o u t final year honours (Gt. Britain) level. Transport processes in semiconductors are discussed with great clarity, and particular care is taken to examine the validity of the usual assumptions made in the derivations.

A very clear and comprehensive account of solar cell materials and structures is given in the third chapter with data tables of properties for all the materials o f major interest. The discussion of interfaces in this chapter is probably the most complete and comprehensive account to be found in any one b o o k. The next three chapters on homojunction, heterojunction and barrier cells have a similar format. A general introduction is followed b y a qualitative discussion which establishes the physical principles involved.

A clear mathematical treatment of the junction is then developed, and a short discussion section closes the chapter. The treatment of each t y p e of junction is clear and comprehensive, with just a b o u t all available cell structures being discussed, and these chapters are a mine of information and perceptive comments.

For any research worker in solar cells this b o o k will be invaluable, and anyone starting in the field could have no better introduction. BOB HILL © Elsevier Sequoia/Printed in The N e t h e r l a n d s.

The question I meant to ask is about the the time that I am not physically present in US i.e. If I went for vacction in India for a month, can that one month be included in my H1B1 extension since I was not physically present in US. Shabloni pozdraviteljnih otkritok word.