Results 111 to 120 of about 32,134 (136)

Near-Infrared Spectrophotometry

1993
Light absorption in tissue is very limited in the near-infrared range; thus brain tissue may be transilluminated effectively using standard technology. Measurements of brain oxygenation and circulation can be obtained at the cotside. Although the techniques are still under development and the application in newborn infants is still limited, the use of ...
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Some problems in infrared spectrophotometry

Journal of Molecular Structure, 1973
Abstract : It is well known that infrared intensity measurements are not very accurate. Nevertheless modern infrared spectrophotometers do exhibit good reproducibility, at least over small time intervals. Failure to obtain closer inter-laboratory agreement must result from systematic instrumental errors and faulty experimental technique.
R.P. Young, J.P. Hawranek, R.N. Jones, P. Neelakantan, D. Escolar   +4 more
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Near-infrared spectrophotometry of Titan

Icarus, 1975
Several unusual features in the near-IR spectrum of Titan are examined. Observations during four apparitions establish the reality of the S(1) absorption at 8150.7 A, but the existence of the S(O) absorption at 8272.7 A will require further sightings to become definitively established. These two features are particularly important, as they bear on the
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Infrared and ultraviolet spectrophotometry in residue evaluations

1964
In order to begin this discussion of infrared and ultraviolet spectrophotometry in residue evaluations, it is important to discuss briefly the broad field of spectrophotometry and to define the various regions of the electromagnetic spectrum of interest.
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Deuterium analysis by infrared spectrophotometry

Talanta, 1960
Abstract An improved method for the infrared spectrophotometric determination of deuterium is described.
R.N. Jones, Marjory A. MacKenzie
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Nonlinear multicomponent analysis by infrared spectrophotometry

Analytical Chemistry, 1983
Les techniques des moindres carres, matricielles, pour les analyses de systemes n'obeissant pas a la loi de Beer Lambert, sont developpees et testees sur des alcanes legers.
Mark A. Maris, Chris W. Brown, Donald S. Lavery   +2 more
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Near-Infrared Spectrophotometry of the Brain in Cardiovascular Surgery

The Thoracic and Cardiovascular Surgeon, 1998
Neuropsychological and neurological deficits are still major causes of mortality and morbidity after cardiac operations and are thought to be caused by embolism and cerebral hypoxia. Near-infrared spectrophotometry (NIRS) is a promising method for non-invasive monitoring of cerebral oxygenation and hemodynamics. Different devices provide information on
Richard A. Jonas, T Shin'oka, Georg Nollert   +2 more
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Spectrophotometry of Stars in the Near Infrared

1987
The aim of this exercise is to become acquainted with some aspects of spectro-photometrical observations in the near infrared with modern detectors and mainly with the calibration problem. Any spectrophotometrical work i.e. any attempt to derive the spectral energy distribution of a star includes the determination of the response curve of the system, S(
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An Intensity-Compensating System for Infrared Spectrophotometry

Journal of the Optical Society of America, 1953
A novel compensating device for use in infrared spectrophotometry has been designed, constructed, and its properties investigated. The device consists of two sector disks rotated synchronously, with phase control on one disk permitting an absolute variation of the transmission factor of the compensator.
H. M. Richardson, M. L. Coffman, Richard G. Fowler   +2 more
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Measurement of Cell Thickness in Infrared Spectrophotometry

Applied Optics, 1967
It is shown that the usual expression for measuring the cell thickness d(a) of an empty cell, namely, d(a) = lambda(1)lambda(2)N/2(lambda(2) - lambda(1)), where N is the number of fringes over the wavelength range lambda(1) and lambda(2), may only be applied under particular conditions of cell and wall thickness and spectrophotometer characteristics ...
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