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A heartwarming story set in Nepal of two resourceful sisters who bring the safety of solar-powered light to their family.
This unique monograph contains a comprehensive overview of celestial mechanics, providing the reader with a solid basis on which to build an understanding of the theory of interplanetary flights. The theoretical development is illustrated with a number of practical examples, bringing to bear the author's wealth of experience gained from working of the Soviet space programme. Many examples are taken from current space topics, including the Shoemaker-Levy 9 comet, the flight of Ulysses over the Solar poles, and the Voyagers' tour of the Solar system. Recent theoretical achivements, such as the intriguing problem of chaos in the Solar system, are also covered.
The XIIlth General Assembly of the International Astronomical Union, held in Prague from 22 to 31 August, 1967, brought together more than 1800 active astron- omers from 40 countries. The agenda of the Assembly ranged from administrative questions to highly intricate scientific problems. Thirty-eight Presidents of the IAU Commissions contributed by their reports to a detailed survey of Astronomy for the period 1964-67. These reports were published in the Transactions of the IAU, Volume XIIIA. Transactions volume XIIIB bring the results of the administrative meetings and of the meetings of Commissions held during the General Assembly. The present volume is devoted to the most important scientific results of the General Assembly as presented in the Invited Discourses, Joint Discussions, and at Special Meetings. It is an established policy of the Union to invite prominent astronomers to hold, during the General Assembly, formal discourses on topics of major importance due to recent significant developments. These Invited Discourses cover, as a rule, broad fields of astronomical interest and are meant to give basic information also to scien- tists from other branches. Subjects which call for a more detailed technical approach are dealt with in the Joint Discussions or at Special Meetings. Here, invited speakers present authoritative surveys complemented by communications on current or envisaged projects. The proceedings of two other meetings, on Moon Probes and on Coordination of Solar Observations Made at Ground-based Observatories and with Space Vehicles, are of a sufficiently wide interest to warrant the inclusion into this volume.
st The solar desalination workshop for the 21 century was sponsored by NATO program Security Through Science. In a great number of countries water scarcity, coupled with a significant growth in population especially in developing countries, poses the serious problem of supplying fresh water. The countries affected by water scarcity are found in the African, Asian, European and American continents, and also are on the southern and eastern coasts of the Mediterranean Sea. Severe drought usually generates a general malaise in populations which are already affected by a number of social and poverty problems, which often lead to significant and uncontrolled emigration towards richer countries, especially if one takes into account the increasing economic and lifestyle gap between north and south Mediterranean countries. Emigration could be contained if basic life needs were guaranteed to the population in their homelands, particularly potable water supply. Abundant solar energy combined with desalination could provide a sustainable source of potable water, but unfortunately, the optimum configuration for solar desalination that would provide inexpensive fresh water is difficult to reach. Further exhaustive research, field developments, and proper mobilization and coordination of funding, research and development is needed to achieve this goal.
Blue blood is flowing in London as a killer slits the throats of the cream of England's aristocracy. Naturally Scotland Yard enlists the great Sherlock Holmes himself. Only when this ultimate weapon of the law failed to stem the deaths are they forced to play a last desperate card - Professor James Moriarty, the Napoleon of Crime, who had his own methods of fighting evil...
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