Electrolytic Separation of Deuterium; Effect of Temperature

1963 ◽  
Vol 18 (3) ◽  
pp. 347-350 ◽  
Author(s):  
M. S. Raman ◽  
R. Kumar ◽  
R. L. Datta
Keyword(s):  
Mild Steel ◽  
Cathode Material ◽  
Temperature Dependence ◽  
Temperature Coefficient ◽  
Separation Factor ◽  
Effect Of Temperature ◽  
Temperature Range ◽  
Nickel Silver ◽  
Electrolytic Enrichment ◽  
Separation Factors

The effects of cathode material and temperature on the separation factor in the electrolytic enrichment of deuterium are investigated in the temperature range 30°—60°C. Mild steel cathodes give separation factors higher than those for nickel, silver, platinum and tin, whereas an alloy of mild steel +7.85% tin gives still higher separation factors. The temperature coefficient of the separation factor (da/dT) for cathodes of tin and for an alloy of mild steel + tin (62.3%) is positive, whereas for other cathodes studied, da/dT is negative. The temperature dependence of the separation factor is decreased by alloying mild steel with tin. It becomes zero for the alloy with 39.5% tin.

Calculation of the Separation Factor for some Silane Systems

2011 ◽  
Vol 391-392 ◽  
pp. 1012-1016
Author(s):  
Zu Min Qiu ◽  
Zhong Wei Liu ◽  
Ping Hu
Keyword(s):  
Mole Fraction ◽  
Separation Factor ◽  
Critical Parameters ◽  
Effect Of Temperature ◽  
Model Parameters ◽  
Wilson Model ◽  
Separation Factors

Six ternary silane systems were selected for the separation factor (s) calculation. These systems were: methyldichlorosilane+methyltrichlorosilane+benzene, methyldichlorosilane+ methyltrichlorosilane+dimethyldichlorosilane, methyldichlorosilane+methyltrichlorosilane+ toluene, methyltrichlorosilane+methylvinyldichlorosilane+toluene,methyldichlorosilane+methyltrichloro- silane+methylvinyldichlorosilane, dimethyldiethoxysilane+methyltriethoxysilane+ethanol. Based on the Antoine constants, critical parameters of the pure components and Wilson model parameters, the separation factors were obtained through a program. The effect of temperature and mole fraction to s was also discussed.

Temperature-dependence of 35Cl N.Q.R. in sodium chloroacetate

1976 ◽  
Vol 29 (11) ◽  
pp. 2363 ◽  
Author(s):  
R Chandramani ◽  
N Devaraj ◽  
VSS Sastry ◽  
J Ramakrishna
Keyword(s):  
Temperature Dependence ◽  
Temperature Coefficient ◽  
Room Temperature ◽  
Single Line ◽  
Temperature Range ◽  
Brown's Method

N.q.r. in sodium chloroacetate has been investigated at temperatures from 77 K to room temperature (c.300 K). A single line has been observed throughout this temperature range. Torsional frequencies of the molecule have been calculated in the above temperature range from Bayer's theory. Also the temperature coefficient of the torsional frequencies has been calculated by Brown's method.

Radiation-induced reactions with cellulose. VII. Effect of temperature and substituted styrenes in the copolymerization process

1970 ◽  
Vol 23 (6) ◽  
pp. 1163 ◽  
Author(s):  
S Dilli ◽  
JL Garnett
Keyword(s):  
Reaction Mechanism ◽  
Temperature Dependence ◽  
Effect Of Temperature ◽  
Methoxy Derivative ◽  
Temperature Range ◽  
Hammett Constants ◽  
Radiation Induced ◽  
Radiation Induced Grafting ◽  
Electron Withdrawing Substituents

The temperature dependence of the radiation-induced grafting of styrene to cellulose has been studied. The system cellulose-styrene-methanol was examined in the temperature range from 40° to -196° in order to observe possible ionic contributions to the reaction mechanism. This effect was further investigated using a series of substituted styrenes containing both electron-donating and electron- withdrawing substituents. The 17 monomers used included o-, m-, and p-mono- halogenated styrenes, a number of alkylstyrenes and the p-methoxy derivative. An attempt has been made to correlate the grafting results with the Hammett constants for the substituent. The consumption of monomer during grafting of styrene to cellulose has also been investigated.

Effect of Temperature on Effluent Quality in a Biological Wastewater Treatment Process

2019 ◽  
Vol 15 (1) ◽  
Author(s):  
E. Tejaswini ◽  
G. Uday Bhaskar Babu ◽  
A. Seshagiri Rao
Keyword(s):  
Growth Rate ◽  
Activated Sludge ◽  
Decay Rate ◽  
Kinetic Parameters ◽  
Temperature Coefficient ◽  
Oxygen Demand ◽  
Effect Of Temperature ◽  
Activated Sludge Process ◽  
Temperature Range ◽  
Wide Range

Abstract In the present study, the temperature effects on the organic carbon and nitrogen removal in an activated sludge process are evaluated. Benchmark Simulation Model No.1 (BSM1) based on activated sludge process is used for all the simulation purposes. A steady state simulation is performed to analyze the effluent concentrations with varying kinetic parameters obtained from different temperature coefficients over a wide range of temperatures from 15 °C to 35 °C. The temperature coefficient ‘a’ is assumed to have different set of values specific to the kinetic parameters, namely, Maximum heterotrophic growth rate \left( {{\mu _{mH}}} \right), Maximum autotrophic growth rate \left( {{\mu _{mA}}} \right), Heterotrophic decay rate \left( {{b_H}} \right), Autotrophic decay rate \left( {{b_A}} \right). The effluent concentration defined in terms of Chemical Oxygen Demand (COD), Biochemical Oxygen Demand (BOD), Total Suspended Solids (TSS), Total Nitrogen (TN) and Ammonia are observed to be significantly changing with a change in the kinetic parameters which are in turn a strong function of temperature coefficient. Emphasis is laid on the temperature range of 25–30 °C as it is commonly the most operated temperature range in a WWTP in India. It is also noticed that at temperatures <20 °C and >30 °C, the effluent limitations are violated from the standard values.

Silicon Fringe Sample Metrology—A Thickness Measurement Technique

2013 ◽  
Author(s):  
Mark Kimball
Keyword(s):  
Temperature Dependence ◽  
Temperature Coefficient ◽  
Measurement Technique ◽  
Thickness Measurement ◽  
Sample Thickness ◽  
Index Of Refraction ◽  
Interference Fringes ◽  
Noncontact Method ◽  
Thickness Variations

Abstract Silicon’s index of refraction has a strong temperature coefficient. This temperature dependence can be used to aid sample thinning procedures used for backside analysis, by providing a noncontact method of measuring absolute sample thickness. It also can remove slope ambiguity while counting interference fringes (used to determine the direction and magnitude of thickness variations across a sample).

The Effect of Concentrated Light Intensity on Temperature Coefficient of the InGaP/InGaAs/Ge Triple-Junction Solar Cell

2015 ◽  
Vol 8 (1) ◽  
pp. 106-111 ◽  
Author(s):  
Zilong Wang ◽  
Hua Zhang ◽  
Wei Zhao ◽  
Zhigang Zhou ◽  
Mengxun Chen
Keyword(s):  
Solar Cell ◽  
Light Intensity ◽  
Temperature Dependence ◽  
Temperature Coefficient ◽  
Triple Junction ◽  
Concentration Ratio ◽  
Crystalline Silicon ◽  
Photovoltaic System ◽  
Solar Pv ◽  
Junction Solar Cell

Research on automatic tracking solar concentrator photovoltaic systems has gained increasing attention in developing the solar PV technology. A paraboloidal concentrator with secondary optic is developed for a three-junction GaInP/GalnAs/Ge solar cell. The concentration ratio of this system is 200 and the photovoltaic cell is cooled by the heat pipe. A detailed analysis on the temperature coefficient influence factors of triple-junction solar cell under different high concentrations (75X, 100X, 125X, 150X, 175X and 200X) has been conducted based on the dish-style concentration photovoltaic system. The results show that under high concentrated light intensity, the temperature coefficient of Voc of triple-junction solar cell is increasing as the concentration ratio increases, from -10.84 mV/°C @ 75X growth to -4.73mV/°C @ 200X. At low concentration, the temperature coefficient of Voc increases rapidly, and then increases slowly as the concentration ratio increases. The temperature dependence of η increased from -0.346%/°C @ 75X growth to - 0.103%/°C @ 200X and the temperature dependence of Pmm and FF increased from -0.125 W/°C, -0.35%/°C @ 75X growth to -0.048W/°C, -0.076%/°C @ 200X respectively. It indicated that the temperature coefficient of three-junction GaInP/GalnAs/Ge solar cell is better than that of crystalline silicon cell array under concentrating light intensity.

Acetylene chemisorption at palladium: Effect of temperature and structure of the surface

1984 ◽  
Vol 49 (6) ◽  
pp. 1448-1458
Author(s):  
Josef Kopešťanský
Keyword(s):  
Work Function ◽  
Atomic Hydrogen ◽  
Effect Of Temperature ◽  
Thermally Stable ◽  
Template Effect ◽  
Temperature Range ◽  
Adsorbed Layers ◽  
Different Types ◽  
Adsorption Complexes ◽  
Low Coverage

The effect of temperature and structure of the palladium surfaces on acetylene chemisorption was studied along with the interaction of the adsorbed layers with molecular and atomic hydrogen. The work function changes were measured and combined with the volumetric measurements and analysis of the products. At temperature below 100 °C, acetylene is adsorbed almost without dissociation and forms at least two different types of thermally stable adsorption complexes. Acetylene adsorbed at 200 °C is partly decomposed, especially in the low coverage region. Besides the above mentioned effects, the template effect of adsorbed acetylene was studied in the temperature range from -80° to 25 °C. It has been shown that this effect is a typical phenomenon of the palladium-acetylene system which is not due to surface impurities.

Specific features of the temperature dependence of tryptophan fluorescence lifetime in the temperature range of −170–20 °C

2020 ◽  
Vol 393 ◽  
pp. 112435
Author(s):  
Peter P. Knox ◽  
Vladimir V. Gorokhov ◽  
Boris N. Korvatovsky ◽  
Nadezhda P. Grishanova ◽  
Sergey N. Goryachev ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Fluorescence Lifetime ◽  
Tryptophan Fluorescence ◽  
Temperature Range

scholarly journals Temperature Dependence of Limiting Fluorescence Anisotropy of POPOP in Cellulose Acetate Film

1985 ◽  
Vol 40 (6) ◽  
pp. 559-561
Author(s):  
A. Kawski ◽  
A. Kubicki ◽  
I. Weyna ◽  
I. Janić
Keyword(s):  
Temperature Dependence ◽  
Cellulose Acetate ◽  
Fluorescence Anisotropy ◽  
Thermal Relaxation ◽  
Effect Of Temperature ◽  
Torsional Vibrations ◽  
Slow Increase ◽  
Cellulose Acetate Film ◽  
Luminescent Centre

The effect of temperature (103 K < T < 303 K) upon the limiting fluorescence anisotropy r0 of POPOP was investigated in a cellulose acetate film. A slow increase in r0 was observed when reducing the temperature. Based on the Jabłoński theory, the frequency of the torsional vibrations of POPOP was determined to be w = 1.3 x 1012s−1. The depolarization due to these torsional vibrations was found to occur immediately following excitation during the thermal relaxation of the luminescent centre, thus somewhat lowering the value of the fundamental fluorescence anisotropy rf to the limiting r0 value.

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