Academic literature on the topic 'Conditions de charge variables'

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Journal articles on the topic "Conditions de charge variables"

1

Wisawapipat, W., I. Kheoruenromne, A. Suddhiprakarn, and R. J. Gilkes. "Surface charge characteristics of variable charge soils in Thailand." Soil Research 48, no. 4 (2010): 337. http://dx.doi.org/10.1071/sr09151.

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Surface charge characteristics were investigated using a charge fingerprinting procedure for 90 samples from 32 profiles of highly weathered Oxisols and Ultisols derived from shale/limestone, basalt, granite, local alluvium, sedimentary, and metasedimentary rocks under tropical savanna and tropical monsoonal climates in Thailand. The charge fingerprints of 5 whole soils, after removal of organic matter and of kaolin and ion oxides from these soils, were also measured to clarify factors contributing to the variable charge behaviour. Phosphate sorption was determined and related to charge proper
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Juban, Rusty, and Lara Gardner. "To File or Not to File? How EEOC Claims Change with the Economy." Labor Studies Journal 45, no. 3 (2020): 296–318. http://dx.doi.org/10.1177/0160449x19897403.

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Discrimination and sexual harassment are pervasive problems in today’s organizations. Traditionally, individual variables such as justice and power are used to study an employee’s response to discrimination or sexual harassment. In this study, we propose the use of economic variables (unemployment and economic health) to explain when an individual is more likely to make a discrimination or sexual harassment charge. Using monthly data from the U.S. Equal Employment Opportunity Commission on discrimination charges, we find there is strong evidence that U.S. economic conditions play an important
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Shingne, Prasad S., Jeff Sterniak, Dennis N. Assanis, Claus Borgnakke, and Jason B. Martz. "Thermodynamic model for homogeneous charge compression ignition combustion with recompression valve events and direct injection: Part II—Combustion model and evaluation against transient experiments." International Journal of Engine Research 18, no. 7 (2016): 677–700. http://dx.doi.org/10.1177/1468087416665052.

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This two-part article presents a combustion model for boosted and moderately stratified homogeneous charge compression ignition combustion for use in thermodynamic engine cycle simulations. The model consists of two parts: one an ignition model for the prediction of auto-ignition onset and the other an empirical combustion rate model. This article focuses on the development of the combustion model which is algebraic in form and is based on the key physical variables affecting the combustion process. The model is fit with experimental data collected from 290 discrete automotive homogeneous char
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Wohaib, Ameer Zuhair, and Nidhal Khazaal Maraie. "Variables affecting sulfasalazine - ion exchange resin complexation." Al Mustansiriyah Journal of Pharmaceutical Sciences 19, no. 4 (2019): 140–50. http://dx.doi.org/10.32947/ajps.v19i4.645.

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The aim of this work is studying the effect of different variables on the loading of sulfasalazine on DEAE sephadex A 25 ion exchange resin as a carrier for systemic action. Different drug: resin complexes (resinate) of different ratios (2:1, 1:1, 1:2, 1:4, 1:6) were prepared, dionized distilled
 water used to prepare sulfasalazine solution, and their entrapment efficiency was estimated through changing variable conditions including temperature of stirring, stirring time, stirring speed, pH. The best complex was formed using 1:6 drug: resin ratio prepared at 50 ºC, stirring speed 400 rpm
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Edström, K., and S. T. Glad. "Algorithmic, physically based mode initialization when simulating hybrid systems." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 216, no. 1 (2002): 65–72. http://dx.doi.org/10.1243/0959651021541435.

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In the simulation of hybrid systems, discontinuities can appear at mode changes. An algorithm is presented that gives initial values for the continuous state variables in a new mode. The algorithm is based on a switched bond graph representation of the system, and it handles discontinuities introduced by a changed number of state variables at a mode change. The algorithm is obtained by integrating the bond graph relations over the mode change and assuming that the physical variables are bounded. This gives a relation between the variables before and after the mode change. It is proved here tha
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Marchi, Giuliano, Cesar Crispim Vilar, George O’Connor, and Marx Leandro Naves Silva. "Surface Complexation Modeling in Variable Charge Soils: Charge Characterization by Potentiometric Titration." Revista Brasileira de Ciência do Solo 39, no. 5 (2015): 1387–94. http://dx.doi.org/10.1590/01000683rbcs20140528.

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ABSTRACT Intrinsic equilibrium constants of 17 representative Brazilian Oxisols were estimated from potentiometric titration measuring the adsorption of H+ and OH− on amphoteric surfaces in suspensions of varying ionic strength. Equilibrium constants were fitted to two surface complexation models: diffuse layer and constant capacitance. The former was fitted by calculating total site concentration from curve fitting estimates and pH-extrapolation of the intrinsic equilibrium constants to the PZNPC (hand calculation), considering one and two reactive sites, and by the FITEQL software. The latte
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Liu, Wei, Zhirun Yuan, Changbin Mao, Qingxi Hou, and Kecheng Li. "Removal of hemicelluloses by NaOH pre-extraction from aspen chips prior to mechanical pulping." BioResources 6, no. 3 (2011): 3469–80. http://dx.doi.org/10.15376/biores.6.3.3469-3480.

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chips prior to mechanical pulping, which would offer new feedstocks for the production of chemicals and fuels. The aim of this study was to evaluate pre-extraction to maximize pre-extraction yield, while minimizing negative impacts on wood chips. The effects of three independent process variables (NaOH charge, pre-extraction temperature, and time) on three dependent variables (pre-extraction yield, xylan extraction yield, and cellulose content based on original wood) were studied using a Box-Behnken experimental design. The mathematical models were obtained and validated well. It was found tha
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Robertson, Kevin, Raynald Gauvin, and James Finch. "Charge Contrast Imaging of Gibbsite Using the Variable Pressure SEM." Microscopy and Microanalysis 10, no. 6 (2004): 721–32. http://dx.doi.org/10.1017/s1431927604040590.

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The variable pressure scanning electron microscope (VP-SEM) allows imaging of insulators without the need for a conductive coating, due to charge neutralization at the surface from recombination of positive ions and surface electrons. Varying certain parameters such as pressure, bias, and working distance creates incomplete neutralization, and localized charging develops called charge contrast. Although the exact mechanism creating charge contrast imaging (CCI) is unknown, it is agreed that it is related to an optimum charge compensation. The behavior of the CCI is still vague, which presents
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Suárez-Carreño, Franyelit, and Luis Rosales-Romero. "Anisotropy Induced by Electric Charge: A Computational Analytical Approach." Physics 6, no. 2 (2024): 780–92. http://dx.doi.org/10.3390/physics6020048.

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This paper presents a novel class of interior solutions for anisotropic stars under the imposition of a self-similar symmetry. This means proposing exact solutions to the Einstein field equations to describe charged matter distribution with radiation flow. The Einstein–Maxwell system by employing specific choices of mass function is formulated to describe the gravitational collapse of charged, anisotropic, spherically symmetric distributions using the Schwarzschild metric. Two ordinary differential equations governing the dynamics are derived by matching a straightforward solution of the symme
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Osmolovskii, Nikolai P., Meizhi Qian, and Jan Sokołowski. "Network optimality conditions." Control and Cybernetics 52, no. 2 (2023): 129–80. http://dx.doi.org/10.2478/candc-2023-0035.

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Abstract Optimality conditions for optimal control problems arising in network modeling are discussed. We confine ourselves to the steady state network models. Therefore, we consider only control systems described by ordinary differential equations. First, we derive optimality conditions for the nonlinear problem for a single beam. These conditions are formulated in terms of the local Pontryagin maximum principle and the matrix Riccati equation. Then, the optimality conditions for the control problem for networks posed on an arbitrary planar graph are discussed. This problem has a set of indep
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