A microcomputer program in BASIC for predicting percentage of occurrence of electroshock-induced convulsion in mice was designed. A formula published by the author to express the mathematical relationship among the dr...
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A microcomputer program in BASIC for predicting percentage of occurrence of electroshock-induced convulsion in mice was designed. A formula published by the author to express the mathematical relationship among the drug dose, the time, and the biological response was used in this program. Analysis of the actual, and the computer-assisted predicted percentages of occurrence of convulsion has shown that the program is fairly accurate in expressing convulsion response of mice as a function of the voltage and the duration.
A unified approach has been presented for the computation of concentration distributions in streams. Starting from the Cartesian-coordinates equation governing mass transport in a stream of constant width, the equatio...
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A unified approach has been presented for the computation of concentration distributions in streams. Starting from the Cartesian-coordinates equation governing mass transport in a stream of constant width, the equation describing mass transport in a stream of variable width can be obtained using transformed coordinates. For these coordinates the solution domain is rectangular. Due to the mathematical similarity between the two equations, a common numerical discretization procedure can be employed. The procedure is based on the use of the control volume approach and the power-law interpolation scheme between nodes. The resulting computer program was used for computation of the transverse mixing coefficient in a riverine reach.
Possible configurations for microfabricated inductors are considered, Inductance can be set by adjusting permeability through control of anisotropy of a permalloy core or via a patterned quasi-distributed gap. A desig...
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Possible configurations for microfabricated inductors are considered, Inductance can be set by adjusting permeability through control of anisotropy of a permalloy core or via a patterned quasi-distributed gap. A design methodology based on a simple model is proposed. A more accurate model and a numerical optimization are also developed. Design examples for 5- and 10-MHz buck converters and 2.5-MHz resonant converter applications are presented.
A software for simulating the drying operation of diluted suspensions in conical spouted beds of inert particles has been developed. This computer program combines the fluid flow and the solids circulation models with...
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A software for simulating the drying operation of diluted suspensions in conical spouted beds of inert particles has been developed. This computer program combines the fluid flow and the solids circulation models with the drying kinetic equations. The simulated results for drying animal blood in a spouted bed of inert particles compare with data reported in the literature.
Productivity in Nigeria is decreasing: this has adversely affected the average standard-of-living of the population and led to economic hardship. HIV/AIDS, hunger, disease and wars have lowered African productivity an...
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Productivity in Nigeria is decreasing: this has adversely affected the average standard-of-living of the population and led to economic hardship. HIV/AIDS, hunger, disease and wars have lowered African productivity and the effectivenesses of public utilities have declined, while unemployment and crime are on the increase. A computer program, which considers the combined concept of partial productivity, total productivity measurement and reliability in order to analyse the effectiveness of a firm, society or nation has been developed. Its predictions have been tested with data from a Nigerian petroleum-product marketing company, namely Rock Oil and Gas Ltd., Aba, Abia State: the management of this business is representative of those of many Nigerian firms. The developed software (see Appendix) can help in identifying the causes of productivity problems, which can so adversely affect the performance of any organisation. (c) 2007 Elsevier Ltd. All rights reserved.
One of the problems encountered in power-systems operation is the generation of unbalanced voltages and currents in the presence of long transmission lines with few or no transpositions, including possible unbalances ...
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One of the problems encountered in power-systems operation is the generation of unbalanced voltages and currents in the presence of long transmission lines with few or no transpositions, including possible unbalances arising in source and load conditions, or indeed any items of plant such as shunt and series reactors. To improve or investigate these unbalance effects in any detail, a 3-phase-load-flow solution that allows representation of all possible unbalances as they exist in the power-systems network without making any assumptions is essential. Consequently, a working Newton-Raphson algorithm is presented, which forms the basis of a computer program developed for the specific purpose of solving the 3-phase-load-flow problem. An indication of program facilities is given, together with sample results for illustration.
The computer program Hyp Delta H is a general-purpose Windows (R) application designed to derive equilibrium constants and/or formation enthalpies of complexes from solution calorimetric data. Least-squares minimizati...
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The computer program Hyp Delta H is a general-purpose Windows (R) application designed to derive equilibrium constants and/or formation enthalpies of complexes from solution calorimetric data. Least-squares minimization is used with the analytically determined derivatives. The efficacy of the program is demonstrated by application to the calculation of formation constants and enthalpies for the formation of AgPy+ and AgPy2+, and also of CH(3)HgGly(+), CH(3)HgGlyH and (CH3Hg)(2)Gly(2+). The results are compared with published data.
Industrial processes are naturally multivariable in nature. A comparison of multivariable decentralized controllers has been performed and a multivariable four interconnected water tank system, which exhibits a RHP (R...
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Industrial processes are naturally multivariable in nature. A comparison of multivariable decentralized controllers has been performed and a multivariable four interconnected water tank system, which exhibits a RHP (Right Half Plane) zero is considered for decentralized control. The characteristics of a four-tank system are discussed and a decentralized PI (Proportional-Integral) controller is designed for the system based on various control algorithms. The algorithms are simulated using MATLAB and the performances are compared for reference tracking, disturbance rejection and model uncertainty cases. The comparison of the results show that the controllers based on Gershgorin band and Ideal relay method are suitable for the control of a four-tank system.
Bubble point pressure is a crucial PVT parameter of reservoir fluids, which has a significant effect on oil field development strategies, reservoir evaluation and production calculations. This communication presents a...
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Bubble point pressure is a crucial PVT parameter of reservoir fluids, which has a significant effect on oil field development strategies, reservoir evaluation and production calculations. This communication presents a new mathematical model to calculate the saturation pressures of crude oils as a function of temperature, hydrocarbon and non-hydrocarbon reservoir fluid compositions, and characteristics of the heptane-plus fraction. The model was developed and tested using a total set of 130 experimentally measured compositions and saturation pressures of crude oil samples from different geographical locations covering wide ranges of crude oil properties and reservoir temperatures. In-depth comparative studies have been carried out between this new model and five well known predictive models for estimation of saturation pressure of crude oils. The results show that the developed model is more accurate and reliable with the average absolute relative deviation of 4.7% and correlation coefficient of 0.992. In addition, it is shown that the proposed model correctly captures the physical trend of changing the saturation pressure as a function of the input variables.' Finally, the applicability domains of the proposed model and quality of the existing experimental data were examined by outlier diagnostics. (C) 2013 Elsevier B.V. All rights reserved.
In this article, a new molecular alignment procedure to provide general-purpose, fast, automatic, and user-intuitive three-dimensional molecular alignments is presented. This procedure, called Topo-Geometrical Superpo...
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In this article, a new molecular alignment procedure to provide general-purpose, fast, automatic, and user-intuitive three-dimensional molecular alignments is presented. This procedure, called Topo-Geometrical Superposition Approach (TGSA), is only based on comparisons of atom types and interatomic distances;hence, the procedure can handle large molecular sets within affordable computational costs. The method is able to accurately align 3D structures using the common molecular substructures, as inferred by the bonding pattern (atom correspondences), where present. The algorithm has been implemented into a program named TGSA99, and it has been tested over eight different molecular sets: flavilium salts, amino acids, indole derivatives, AZT, steroids, anilide derivatives, poly-aromatic-hydrocarbons, and inhibitors of thrombine. The TGSA algorithm performance is evaluated by means of computational time, number of superposed atoms, and index of fit between the compared structures. (C) 2000 John Wiley & Sons, Inc.
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