March 28, 2017

Download Approximate tests of independence in contingency tables from by Gad Nathan PDF

By Gad Nathan

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Read Online or Download Approximate tests of independence in contingency tables from complex stratified cluster samples (National Center for Health Statistics. Vital and health ... evaluation and methods research, series 2) PDF

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Additional info for Approximate tests of independence in contingency tables from complex stratified cluster samples (National Center for Health Statistics. Vital and health ... evaluation and methods research, series 2)

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The fiber optic probes interface excitation and collection fiber and the sample. Those compact devices can be located at a large distance from the laser and spectrometer and are extremely suitable for use in industrial environments. There are 28 PHARMACEUTICAL APPLICATIONS OF RAMAN SPECTROSCOPY filtered and unfiltered probes, based on presence of the background signal (coming from the fiber) that is not particularly strong but still in some situations may mask the Raman signal. The unfiltered probes are small, simple, and relatively inexpensive, and are produced in a variety of n-around-1 configurations in which ‘1’ stands for the excitation fiber and ‘‘n’’ for the surrounding collection fibers.

We should not view these two processes as two independent processes but as one simultaneous process. According to quantum mechanical calculation, the total intensity Imn of Raman scattered light corresponding to the transition from the state m to the state n can be expressed as follows: Imn ¼ X 128p5 ðni Æ nmn Þ4 Ii jðars Þmn j2 4 9c rs ð1:12Þ In this formula, the symbol Ii denotes the intensity of incident light (having the frequency of vibration ni ) while the symbol nimn denotes a Raman shift.

The most convenient choice is to use lines in the region of 780 nm from a diode laser. These lasers are based on optical emission from semiconductor junctions. As these are usually characterized INTRODUCTION TO RAMAN SPECTROSCOPY 25 by compact design, small cost, and allowing for adequate Raman response from a variety of samples, the popularity of these lasers appears to be increasing. Another option is to employ the Nd:YAG laser that provides 1064 nm line. These lasers are used in FT instruments.

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