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The objective of this project was to investigate the trends of changes in the crystal morphology of cocaine in the presence of the common adulterants, caffeine and lidocaine HCl. By performing gold chloride microcrystal tests on samples of cocaine with adulterants at 10, 20, and 50% concentrations, trends in the changes of the crystal morphology can be linked to specific adulterants and concentrations. For cocaine/caffeine mixtures, the trend is elongation of one axis, additional branching, and brown discoloration of the crystals. At 50:50 cocaine/caffeine mixtures, branched spherical crystals and long needles appear. The trends for cocaine/lidocaine mixtures include elongation of one axis with an X-shaped middle axis. The axes continue to grow and branching decreases until at 50%, spherical clusters of needles appear. These results indicate microcrystal analysis can be used as a novel method for presumptively identifying not only cocaine but also the identity and concentration of the adulterant. 相似文献
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William Gardner Charles W. Lidz Edward P. Mulvey Esther C. Shaw 《Law and human behavior》1996,20(1):35-48
This is a progress report on the development of practical methods for the actuarial prediction of violence. The literature indicates that actuarial prediction is more accurate than clinical prediction, but in practice actuarial methods seem to be used rarely. Here we address two obstacles to the clinical use of actuarial prediction methods. First, clinicians may be averse to actuarial methods that require calculations. To remedy this, we developed a regression tree screen that presents actuarial information about violence in a series of yes/no questions. Second, using actuarial methods to identify the small minority of violent patients in a general psychiatric population may be too costly. To remedy this, we developed a method to prescreen patients for intensive evaluation using an inexpensive assessment. We evaluated regression trees and two-stage screening by comparing their accuracies against conventional actuarial methods. The results showed that actuarial predictions based on regression trees and two-stage screens were as accurate as regression-based methods in identifying repetitively violent patients. These easier-to-use methods may therefore be useful techniques for actuarial predictions. 相似文献
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Dr. Steven M. Thompson Dr John Thompson Jock Gardner Kevin S. Colglazier 《Cambridge Review of International Affairs》1989,3(2):55-76
Richard Nixon, 1999: victory without war
(New York: Simon and Schuster, 1988; London: Sidgwick and Jackson, 1988)
Anders Stephanson, Kennan and the Art of Foreign Policy. (Harvard University Press, Cambridge, Massachusetts, 1989, pp. xiv + 380, £27.50)
Jacques S. Gansler, Affording Defense. (MIT Press, Cambridge, Massachusetts, 1989, £22.50)
John D. Steinbruner (ed.), Restructuring American Foreign Policy. (The Brookings Institute, Washington, 1989, pp. 260, £8.75 (paperback) & £23.95 (cloth)) 相似文献
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Arthur Gardner LeFrancois 《Journal of criminal justice》1978,6(1):35-46
To reduce the problem of sentencing disparity (unlike sentences for like offenses), the Committee for the Study of Incarceration proposed a determinate sentence scheme based on a desert theory of punishment. While the proposal at first glance may appear to solve many sentencing problems, this paper attempts to show its defects and some of the problems involved in (1) determinate sentence schedules generally, (2) desert as a principle of punishment, and (3) basing a determinate sentence schedule on a desert theory. 相似文献
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