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2 produkter
2 produkter
Inbunden, Engelska, 2006
1 698 kr
Skickas inom 5-8 vardagar
The purpose of this book is to analyze the effects of developed countries' agricultural policies on developing countries. The main focus is on food security, poverty and other topics such as multifunctionality, biotechnology and regional agreements, as an input to policy reform within the World Trade Organization (WTO) trade negotiations. The book arises from a joint project between the Food and Resource Economics Institute in Denmark and the International Food Policy Research Institute in Washington.
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Helio- and asteroseismology study the interior of the Sun and other stars, by means of observations of oscillations on their surfaces. The last 10 years in the study of the solar interior, to a has witnessed a very rapid evolution point where we can now contemplate investigating the physical state of matter, or the details of rotation and other large-scale motion, in the Sun. The stellar studies are in some respects at the point of the solar studies 10 years ago, but appear poised to take off. Thus the time was deemed ripe for lAO Symposium No 123, to assess the present status of this work, and plan for its future development. Apart from the seismic data, few observations are available to provide information about stellar interiors. Detailed studies, by spectral analysis, can be made of stellar surface properties, including atmospheric temperature and chemical composition. However, the stellar radiative spectrum is almost entirely fixed by the mass, luminosity, radius and surface rotation of the star, and contains essentially no other information about the interior. An important test of stellar evolution theory is provided by observations of stel lar clusters, whose members can reasonably be assumed to have the same age and chemical composition. The location of such stars in a HR diagram, where luminosity is plotted against the effective temperature, can roughly be understood in terms of stellar evolution calculations.