Determination of the Propagation Speed of Wave Perturbations in a Two-Component Field

2020 ◽  
pp. 27-33
Author(s):  
V. V. Ocherednik ◽  
A. S. Zapevalov
Keyword(s):  
Propagation Speed ◽  
Two Component ◽  
Component Field

U.V. and U.V. Derivative Spectrophotometric Determination of Two- Component Mixtures

1991 ◽  
Vol 24 (3) ◽  
pp. 451-470 ◽  
Author(s):  
Hesham Salem ◽  
Magda El-Maamli ◽  
Mohamed El-Sadek ◽  
Afaf Aboul Kheir
Keyword(s):  
Spectrophotometric Determination ◽  
Two Component

Two-component gas sensing with MIR dual comb spectroscopy

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Leonard Nitzsche ◽  
Jens Goldschmidt ◽  
Armin Lambrecht ◽  
Jürgen Wöllenstein
Keyword(s):  
Carbon Monoxide ◽  
Nitrous Oxide ◽  
Gas Sensing ◽  
Integration Time ◽  
Relative Precision ◽  
Acquisition Rate ◽  
Mid Infrared ◽  
Two Component ◽  
Absorption Features

Abstract A dual comb spectrometer is used as gas sensor for the parallel detection of nitrous oxide (N2O) and carbon monoxide (CO). These gases have overlapping absorption features in the mid-infrared (MIR) at a wavelength of 4.6 µm. With a spectra acquisition rate of 10 Hz, concentrations of 50 ppm N2O and 30 ppm CO are monitored with a relative precision of 6 × 10 − 3 6\times {10^{-3}} and 3 × 10 − 3 3\times {10^{-3}} respectively. The limit of detections are 91 ppb for N2O and 50 ppb for CO for an integration time of 25 s. The system exhibits a linear sensitivity from 2 ppm to 100 ppm with coefficients of determination of 0.99998 for N2O and 0.99996 for CO.

DETERMINATION OF BOTANICAL COMPOSITION OF TWO-COMPONENT FORAGE MIXTURES

1960 ◽  
Vol 40 (2) ◽  
pp. 225-234 ◽  
Author(s):  
J. W. Tanner ◽  
E. E. Gamble ◽  
W. E. Tossell
Keyword(s):  
Unit Cost ◽  
Estimation Method ◽  
Separation Method ◽  
Botanical Composition ◽  
Visual Estimation ◽  
Two Component ◽  
Late Maturity ◽  
The Difference ◽  
Forage Mixtures

A comparative study was made in 1958 of the visual estimation and hand separation methods of determining botanical composition of two-component forage mixtures. The results indicated that there were positive significant correlations between the per cent legume values obtained by the two methods. The visual estimation method was less variable than the hand separation method and the precision per unit cost was greater. The differences between per cent legume values obtained by the two methods were influenced by the stage of maturity (medium or late hay) of the components and the cut (hay or aftermath). In this study, the difference was significant only in the medium aftermath cut.Individually, three observers showed some inconsistencies between estimates on the medium and late maturity groups and between the hay and aftermath cut. However, by averaging the three estimates to obtain a mean sample, these inconsistencies were minimized.Both methods were more precise in the aftermath pasture cut than in the hay. An additional observer increased precision of the visual estimate more than an additional replicate or sample. The greater precision resulting from additional replicates, samples, or observers increased at a decreasing rate. The number of replicates, samples, and observers required for specific degrees of precision and a specific cost were calculated.The experiment showed that the visual estimation method can be superior to the hand separation method as a means of determining botanical composition.

scholarly journals Nonlinear features of equatorial baroclinic Rossby waves detected in Topex altimeter observations

1996 ◽  
Vol 3 (2) ◽  
pp. 115-126 ◽  
Author(s):  
R. E. Glazman ◽  
A. Fabrikant ◽  
A. M. Greysukh
Keyword(s):  
Rossby Waves ◽  
Propagation Speed ◽  
Altimeter Data ◽  
Satellite Altimeter ◽  
Wave Regime ◽  
Nonlinear Features ◽  
Wavenumber Spectrum ◽  
Satellite Altimeter Data ◽  
Rule Out

Abstract. Using a recently proposed technique for statistical analysis of non-gridded satellite altimeter data, regime of long equatorially-trapped baroclinic Rossby waves is studied. One-dimensional spatial and spatiotemporal autocorrelation functions of sea surface height (SSH) variations yield a broad spectrum of baroclinic Rossby waves and permit determination of their propagation speed. The 1-d wavenumber spectrum of zonal variations is given by a power-law k-2 on scales from about 103 km to 104 km. We demonstrate that the observed wave regime exhibits features of soliton turbulence developing in the long baroclinic Rossby waves. However, being limited to second statistical moments, the present analysis does not allow us to rule out a possibility of weak wave turbulence.

Spectrophotometric Determination of Atropine Sulfate in the Presence of Phenylmercury (II) Acetate

1981 ◽  
Vol 64 (4) ◽  
pp. 855-859
Author(s):  
Abdel Aziz M Wahbi ◽  
Magda Barary
Keyword(s):  
Least Squares ◽  
Spectrophotometric Determination ◽  
Spectrophotometric Method ◽  
Atropine Sulfate ◽  
Official Method ◽  
Method Of Least Squares ◽  
Orthogonal Function ◽  
Two Component ◽  
Good Agreement

Abstract Two-component spectrophotometric method of analysis using 2 wavelengths, the method of least squares using absorbances, the method using 2-orthogonal function coefficients, and the method of least squares using orthogonal function coefficients have been applied to the determination of atropine sulfate in the presence of phenylmercury (II) acetate, compounds whose spectra overlap. The first method gave erroneous results; the second method gave satisfactory results for synthetic mixtures. The fourth method was superior, especially in the presence of irrelevant absorption. It has been successfully used for determining atropine sulfate in injection solutions in which a cubic irrelevant absorption was present. Results were in good agreement with those obtained by the official method.

Application of a vidicon spectrometer for simultaneous multicomponent drug determinations.

1976 ◽  
Vol 22 (11) ◽  
pp. 1862-1867 ◽  
Author(s):  
A E McDowell ◽  
R S Harner ◽  
H L Pardue
Keyword(s):  
Simultaneous Determination ◽  
Small Computer ◽  
Ultraviolet Region ◽  
Matrix Equations ◽  
Aqueous Mixtures ◽  
Two Component ◽  
On Line ◽  
Absorbance Data ◽  
Rapid Scanning

Abstract A rapid scanning vidicon spectrometer has been evaluated for the simultaneous determination of drugs in mixtures, without a separation step. Spectral data in the ultraviolet region are collected on-line with a small computer at repetition rates of 100 scans per second. Absorbance data at several wavelengths are processed by matrix equations to resolve them into the concentration of each component in each mixture. Results are reported for two-component mixtures of procainamide and N-acetylprocainamide in serum, for two-component aqueous mixtures of butabarbital and seconbarbital, and for seven-component aqueous mixtures of phenobarbital, diphenylhydantoin, aminophylline, acetaminophen, salicylamide, phenylbutazone, and secobarbital. We conclude that the computer-inter-faced vidicon spectrometer is a viable tool for simultaneous multicomponent determinations.

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