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This book concerns the use of the drug qat in North Yemen (Yemen Arab Republic), a country lying on the southwestern corner of the Arabian Peninsula. However, because this substance is so interwoven into the fabric of society and culture, it is also necessarily about Yemen itself. The history and culture of South Arabia are still relatively unknown to the rest of the world, and the drug qat, so widely used there, is equally unknown. Thus, the material we present here should be of interest to all of those concerned with drug use, those who wish to understand more about Yemen and the Middle East, and to the Yemenis themselves. Another purpose is to develop some general understandings about sub stance uses and their effects which are less clouded by the mass hysteria and political considerations which often obscure drug issues in our own society. Examination of drug-use patterns in a country where millions of people are users on a regular basis, and where there has been familiarity with t...

This book has evolved by processes of selection and expansion from its predecessor, Practical Scanning Electron Microscopy (PSEM), published by Plenum Press in 1975. The interaction of the authors with students at the Short Course on Scanning Electron Microscopy and X-Ray Microanalysis held annually at Lehigh University has helped greatly in developing this textbook. The material has been chosen to provide a student with a general introduction to the techniques of scanning electron microscopy and x-ray microanalysis suitable for application in such fields as biology, geology, solid state physics, and materials science. Following the format of PSEM, this book gives the student a basic knowledge of (1) the user-controlled functions of the electron optics of the scanning electron microscope and electron microprobe, (2) the characteristics of electron-beam-sample inter- actions, (3) image formation and interpretation, (4) x-ray spectrometry, and (5) quantitative x-ray microanalysis. Each ...