EPR spectra and defect states in glasses of the GexS100-x system

1982 ◽  
Vol 47 (7) ◽  
pp. 1787-1793 ◽  
Author(s):  
Miloslav Frumar ◽  
Gustáv Plesch ◽  
Eva Černošková ◽  
Václav Černý ◽  
Ladislav Tichý ◽  
...  
Keyword(s):  
Experimental Data ◽  
Epr Spectra ◽  
Defect States ◽  
Composition Region ◽  
Active Defect ◽  
Temperature Conditions ◽  
Defect Centres

Glasses of the GexS100-x system were studied in the region of 30 ⪬ x ⪬ 45. The concept of magnetically active defect centres was employed to account for the EPR spectra of pure samples as well as those doped with silver or iodine, prepared in different temperature conditions. In terms of this concept a consistent interpretation of the experimental data could be given for the composition region applied.

Evaporation Momentum Force on a Bubble Under Asymmetric Temperature Conditions

2014 ◽  
Author(s):  
Pruthvik A. Raghupathi ◽  
Satish G. Kandlikar
Keyword(s):  
Experimental Data ◽  
Growth Rate ◽  
Temperature Field ◽  
Growth Model ◽  
Contact Line ◽  
Bubble Growth ◽  
Recent Literature ◽  
Temperature Conditions ◽  
Boiling Enhancement

Recent literature claims that boiling performance can be significantly improved by using evaporation momentum force to control the trajectory of a bubble. This approach merits a detailed investigation into evaporation momentum force and its effect on bubble growth and bubble trajectory. In this paper an expression for evaporation momentum pressure experienced by a bubble is determined. This is incorporated into a well established bubble growth model (Mikic-Rohsenow) to evaluate the effect of evaporation momentum pressure on bubble growth rate. The effect of evaporation momentum force on a bubble growing in asymmetric temperature field is then studied and the resultant trajectory is evaluated. The results are compared with experimental data of bubble trajectory subjected to an asymmetric temperature condition. The final results suggest that the evaporation momentum pressure in the vicinity of contact line can significantly change the bubble trajectory, and surfaces designed to exploit this effect seem to be promising for boiling enhancement.

scholarly journals Investigating the probability of establishment of Zika virus and detection through mosquito surveillance under different temperature conditions

2018 ◽  
Author(s):  
Rebecca C. Christofferson
Keyword(s):  
Experimental Data ◽  
Zika Virus ◽  
Probability Of Detection ◽  
Tropical Regions ◽  
Temperature Conditions ◽  
Significant Difference ◽  
Establishment Potential ◽  
Surveillance Programs ◽  
Successful Establishment ◽  
Incubation Temperatures

AbstractBecause of the increasing threat that Zika virus (ZIKV) poses to extra-tropical regions due to increased global travel, there is a need for better understanding of the effect(s) of temperature on the establishment potential of ZIKV within these subtropical, temperate, and/or seasonal Ae. aegypti populations. The first step to determining risk establishment of ZIKV in these regions is to assess ZIKV’s ability to infect mosquitoes at less tropical temperatures, and thus be detected through common surveillance programs. To that end, the effect of two rearing temperatures (RT) and extrinsic incubation temperatures (EIT) on infection and dissemination rates was evaluated, as well as the interactions of such. Total, there were four combinations (RT24-EIT24, RT24-DEI28, RT28-EIT24, RT28- EIT28). Further, a stochastic SEIR framework was adapted to determine whether observed data could lead to differential success of establishment of ZIKV in naive mosquito populations. There was no consistent pattern in significant differences found across treatments for either infection or dissemination rates (p>0.05), where only a significant difference was found in infection rates between RT24- EIT24 (44%) and RT28-EIT24(82.6%). Across all temperature conditions, the model predicted between a 77.3% and 93.1% chance of successful establishment of ZIKV in naive mosquito populations under model assumptions. Further, the model predicted between 4.1% and 46.7% chance of at least one mosquito developing a disseminated infection, depending on temperature conditions, despite no significant differences in the experimental data. These results indicate that 1) there is no straightforward relationship between RT, EIT, and infection/dissemination rates for ZIKV, similar to what has been reported for DENV, 2) in more temperate climates, ZIKV may still have the ability to establish in populations of Ae. aegypti, and 3) despite a lack of statistical differences in observed experimental data, model predictions indicate that the interplay of rearing and extrinsic incubation temperatures may still alter the kinetics of ZIKV within the mosquito enough to affect numbers of infected/disseminated mosquitoes and the associated probability of detection through surveillance programs.

scholarly journals Output of the dependence of the torque on theangleof rotation of the half couplings of the rope hyperbolic coupling «MAMSAR»

2020 ◽  
pp. 140-145
Author(s):  
М.А. Минасян ◽  
А.М. Минасян ◽  
Л.Х. Ха
Keyword(s):  
Experimental Data ◽  
Operating Temperature ◽  
Operating Conditions ◽  
Correction Coefficient ◽  
Labor Costs ◽  
Temperature Conditions ◽  
Hard Radiation ◽  
Long Time ◽  
Temperature Ranges

Виброизолирующие муфты приводов с упругими канатными элементами являются относительно новым направлением и в литературных источниках малоизвестны [1-14]. Они имеют несколько неоспоримых преимуществ перед другими типами муфт. Их характеристики практически не зависят от температурных режимов эксплуатации (температурные диапазоны эксплуатации – от –200 и вплоть до +370 С); они пожаробезопасны, инертны к агрессивным средам; это практически единственный тип муфт, способный долго работать в зонах повышенной и жесткой радиации. Такая нечувствительность к агрессивным средам и условиям эксплуатации позволяет до минимума сократить трудозатраты на их техническое обслуживание. Статья является логическим продолжением работ авторов о возможности использования канатных опор «MAMSAR» [1-4] в качестве отдельных или сборных муфт приводов. В данной работе в качестве объекта исследования рассматривается муфта с гиперболическим канатным элементом [1]. Целью настоящей статьи является вывод зависимости крутящего момента от смещения для муфт приводов с упругими канатными элементами в виде гиперболы «MAMSAR» [1]. Поставленная цель достигается реализацией следующих задач: 1.Получить формулу зависимости крутящего момента от смещения для гиперболической канатной муфты. 2. Экспериментально определить зависимость крутящего момента от смещения для гиперболической канатной муфты 3. Уточнить формулу – зависимость крутящего момента от смещения для гиперболической канатной муфты с использованием коэффициента поправки на основе экспериментальных данных. Vibration-isolating drive couplings with elastic rope elements are a relatively new direction and are little known in the literature [1-14]. They have several undeniable advantages over other types of couplings. Their characteristics practically do not depend on operating temperature conditions (operating temperature ranges – from -200 and up to +370 C); they are fire-safe, inert to aggressive environments; this is almost the only type of couplings that can work for a long time in areas of high and hard radiation. This insensitivity to aggressive environments and operating conditions allows you to minimize the labor costs for their maintenance. The article is a logical continuation of the authors work on the possibility of using "MAMSAR" rope supports [1-4] as separate or combined drive couplings. In this paper, a coupling with a hyperbolic rope element is considered as an object of research [1]. The purpose of this article is to derive the dependence of torque on displacement for drive couplings with elastic rope elements in the form of a "MAMSAR" hyperbola [1]. This goal is achieved by implementing the following tasks: 1. Get the formula for the dependence of torque on displacement for a hyperbolic cable coupling. 2. Experimentally determine the dependence of torque on displacement for a hyperbolic cable coupling 3. Refine the formula-the dependence of torque on displacement for a hyperbolic cable coupling using the correction coefficient based on experimental data.

Relationship between Gough-Joule Coefficients and Moduli of Vulcanized Rubbers

1950 ◽  
Vol 23 (1) ◽  
pp. 44-53
Author(s):  
F. S. Conant ◽  
G. L. Hall ◽  
G. R. Thurman
Keyword(s):  
Experimental Data ◽  
Butyl Rubber ◽  
Constant Stress ◽  
Tangent Modulus ◽  
Stress Strain ◽  
Temperature Conditions ◽  
Methods Of Measurement

Abstract The Gough-Joule coefficients (1) at constant stress and (2) at constant strain are defined and methods of measurement of each on vulcanized rubbers are given. It is shown mathematically and experimentally that the ratio of (3) to (4) is equal to the “tangent” modulus. The quotient of the Gough-Joule coefficient at constant stress divided by the stress and the quotient of the Gough-Joule coefficient at constant strain divided by the strain are shown to be constants which are independent of the stress-strain-temperature conditions. Experimental data are given for stocks based on Hevea, GR-S, Neoprene-GN, Butyl Rubber, and Butaprene.

AM1 Calculations of Spin Distribution in Hydroxyanthrasemiquinones

1995 ◽  
Vol 60 (7) ◽  
pp. 1081-1093 ◽  
Author(s):  
Martin Breza ◽  
Vlasta Brezová
Keyword(s):  
Experimental Data ◽  
Spin Density ◽  
Spin State ◽  
Epr Spectra ◽  
Am1 Method ◽  
Distribution Data ◽  
Am1 Calculations ◽  
Spin Distribution ◽  
Higher Spin

The AM1 method was used to obtain the optimum geometries of hydroxyanthrasemiquinones. The relation between the spin distribution data obtained by analysis of EPR spectra and by AM1 calculations depends on the position of the C atom within the aromatic skeleton, on its spin density sign and on its position relative to OH substituents. Complete annihilation of higher spin state contaminations is insufficient to eliminate the significant discrepancies between the theoretical and experimental data.

Cold Engine’s Operating Regime Influence over the Exhaust Emissions

2016 ◽  
Vol 822 ◽  
pp. 219-223
Author(s):  
Stelian Tarulescu ◽  
Corneliu Cofaru ◽  
Radu Tarulescu
Keyword(s):  
Experimental Data ◽  
Experimental Research ◽  
Exhaust Emissions ◽  
Operating Regime ◽  
Spark Ignition ◽  
Spark Ignition Engines ◽  
Exhaust Gases ◽  
Temperature Conditions ◽  
Hc Emissions

This paper presents a study regarding the emissions caused by the running of a cold engine and studies the influence of the four-stroke gasoline engine’s temperature on CO2, CO, HC emissions. Experimental research has been done for three light vehicles equipped with a 1390 cm3 Renault spark ignition engines. Several test have been made under different temperature conditions by using a BEA Emission Analyser - Bosch. The experimental data have shown that the engine’s temperature has an influence on CO2, CO, HC emissions. The results show that the highest pollutants values are recorded for low exhaust gases temperature and for cold engine’s running regime.

scholarly journals Composition Related Electrical Active Defect States of InGaAs and GaAsN

2017 ◽  
Vol 15 (1) ◽  
Author(s):  
Arpad Kosa ◽  
Lubica Stuchlikova ◽  
Ladislav Harmatha ◽  
Jaroslav Kovac ◽  
Beata Sciana ◽  
...  
Keyword(s):  
Defect States ◽  
Active Defect

Microdiffraction Patterns of Small Metallic Particles II; Theoretical Analysis

1982 ◽  
Vol 40 ◽  
pp. 668-669
Author(s):  
A. Gómez ◽  
P. Schabes-Retchkiman ◽  
M. José-Yacamán ◽  
T. Ocaña
Keyword(s):  
Experimental Data ◽  
Electron Diffraction ◽  
Theoretical Analysis ◽  
Size Range ◽  
Dynamical Theory ◽  
Metallic Particles ◽  
Splitting Effect

The splitting effect that is observed in microdiffraction pat-terns of small metallic particles in the size range 50-500 Å can be understood using the dynamical theory of electron diffraction for the case of a crystal containing a finite wedge. For the experimental data we refer to part I of this work in these proceedings.

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