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The effect of a magnetic field on a 2D problem of fibre-reinforced thermoelasticity rotation under three theories

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Chinese Physics B 2012年第6期21卷 264-275页

作者： kh.Lotfy Department of Mathematics Faculty of ScienceZagazig UniversityZagazigP.O.Box 44519Egypt Department of Mathematics Faculty of Science and ArtsAl-mithnabQassim UniversityP.O.Box 931Buridah 51931Al-mithnabKingdom of Saudi Arabia

In the present paper, we introduce the coupled theory （CD）, Lord-Schulman （LS） theory, and Green-Lindsay （GL） theory to study the influences of a magnetic field and rotation on a two-dimensional problem of fibre-reinforced thermoelasticity. The material is a homogeneous isotropic elastic half-space. The method applied here is to use normal mode analysis to solve a thermal shock problem. Some particular cases are also discussed in the context of the problem. Deformation of a body depends on the nature of the force applied as well as the type of boundary conditions. Numerical results for the temperature, displacement, and thermal stress components are given and illustrated graphically in the absence and the presence of the magnetic field and rotation.

关键词： Lord-Schulman theory Green-Lindsay theory coupled theory reinforcement rotation,magnetic field

Effect of High-Frequency Electric Field on Propagation of Electrostatic Wave in a Non-Uniform Relativistic Plasma Waveguide

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Plasma Science and Technology 2008年第3期10卷 278-283页

作者： kh.H.EL-SHORBAGY Plasma Physics and Nuclear Fusion Department Nuclear Research Center Atomic Energy Authority Cairo Egypt

The effect of a high frequency （HF） electric field on the propagation of electrostatic wave in a 2D non-uniform relativistic plasma waveguide is investigated. A variable separation method is applied to the two-fluid plasma model. An analytical study of the reflection of electrostatic wave propagation along a magnetized non-uniform relativistic plasma slab subjected to an intense HF electric field is presented and compared with the case of a non relativistic plasma. It is found that, when the frequency of the incident wave is close to the relativistic electron plasma frequency, the plasma is less reflective due to the presence of both an HF field and the effect of relativistic electrons. On the other hand, for a low-frequency incident wave the reflection coefficient is directly proportional to the amplitude of the HF field. Also, it is shown that the relativistic electron plasma leads to a decrease in the value of reflection coefficient in comparison with the case of the non relativistic plasma.

关键词： electrostatic wave relativistic plasma waveguide reflection coefficient separation method

THE DRAG EXERTED BY AN OBLATE ROTATING ATMOSPHERE ON AN ARTIFICIAL SATELLITE

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Applied Mathematics and Mechanics(English Edition) 2002年第9期23卷 1016-1028页

作者： kh.I.khalil National Research Institute of Astronomy and Geophsics-Helwan Cairo Egypt

A theory is formulated for the motion of an artificial satellite under the joint effects of Earth oblateness and atmospheric drag. The Hamilton ' s equations of motion are derived including the zonal harmonics of the geopotential up to J4 and the drag accelerations. The atmospheric model is an oblate rotating model in which the atmospheric rotation lags behind that of the Earth as the increasing distance from the Earth. The drag free problem is first solved via two canonical transformations to eliminate in succession the short and long period terms. An operator D is then defined and used to formulate the drag acceleration in terms of the double primed variables expressing the solution of the drag-free problem.

关键词： oblateness the Hamiltonian Lie transform

Abnormal liver function tests associated with severe rhabdomyolysis

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World Journal of Gastroenterology 2020年第10期26卷 1020-1028页

作者： Andy kh Lim Department of General Medicine Monash Health Department of Medicine School of Clinical Sciences Monash University

Rhabdomyolysis is a syndrome of skeletal muscle injury with release of cellular constituents such as potassium,phosphate,urate and intracellular proteins such as myoglobin into the circulation,which may cause complications including acute kidney injury,electrolyte disturbance and cardiac *** liver function tests are frequently observed in cases of severe ***,there is an increase in serum aminotransferases,namely aspartate aminotransferase and alanine *** raises the question of liver injury and often triggers a pathway of investigation which may lead to a liver ***,muscle can also be a source of the increased aminotransferase *** review discusses the dilemma of finding abnormal liver function tests in the setting of muscle injury and the potential implications of such an *** delves into some of the clinical and experimental evidence for correlating muscle injury to raised aminotransferases,and discusses pathophysiological mechanisms such as oxidative stress which may cause actual liver *** aminotransferases lack tissue specificity to allow clinicians to distinguish primary liver injury from muscle *** review also explores potential approaches to improve the accuracy of our diagnostic tools,so that excessive or unnecessary liver investigations can be avoided.

关键词： Rhabdomyolysis Muscle Creatine kinase Liver function tests Alanine aminotransferase Aspartate aminotransferase Aminotransferases

Effects of natural products on ischemic heart diseases and cardiovascular system

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Acta Pharmacologica Sinica 2002年第12期23卷 89-98页

作者： Benny kh TAN,Matthew WHITEMAN Department of Pharmacology Department of Biochemistry Faculty of Medicine National University of Singapore Singapore

INTRODUCTION Ischemic heart diseases remain the leading causeof death in most developed countries as seen over thepast quarter-century. Reducing the mortality rate andprevention of myocardial infarction (MI) are of utmostimportance. The use of Western medicinal drugs forthe treatment of hypertension, congestive heart failureand post MI are widely accepted. Although some Tra-ditional Chinese Medicines have been used in mainland,Hong Kong, Taiwan of China in clinics and other Chi-nese communities worldwide for centuries, our under-

关键词： myocardial infarction herbal medicine antioxidants cardiovascular system Salvia miltiorrhiza

Larval feeding status regulates the transcript levels of genes encoding PTTH and allatoregulatory peptides in silkworm Bombyx mori

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Insect Science 2021年第3期28卷 680-691页

作者： Sanathoibi D.kh Bela Keshan Department of Zoology North-Eastern Hill UniversityShillongMeghalayaIndia

In Bombyx mori,two dorsolateral neurosecretory cells(NSCs)in each of thetwo brain lobes have been identified as prothoracicotropic hormone(PTTH)*** neuropeptide in insects stimulates the prothoracic gland for the synthesis andrelease of ecdysone,responsible for the molting ***(AT)and allatostatin(AST)are allatoregulatory neuropeptides that regulate juvenile hormone ***,by using RT-qPCR,we showed that in ***,nutritional stress modulates themRNA expression of AT and AST-C(allatostain type C)in the central nervous systemconsisting of the brain lobes and all the associated *** whole-mount in situhybridization,we showed that the feeding status of Bombyx larvae also influences the ex-pression of PTTH in the NSCs of the *** deprivation significantly decreased themRNA expression levels of PTTH in larvae at active or terminal growth ***,we showed that insulin modulates the expression level of ***,its action wasdependent on the feeding status of the *** feeding,the insulin decreased the PTTHexpression level,while at food deprivation,the insulin increased the PTTH *** data thus indicates that larval feeding status plays an important role in alteringthe mRNA expression levels of allatoregulatory peptide genes and PTTH.

关键词： allatotropin allatostatin feeding food deprivation prothoracicotropic hor-mone silkworm

The effect of rotation on plane waves in generalized thermo-microstretch elastic solid with one relaxation time for a mode-I crack problem

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Chinese Physics B 2011年第7期20卷 266-278页

作者： kh.Lotfy Mohamed I.A.Othman Department of Mathematics Faculty of ScienceZagazig UniversityP.O.Box 44519ZagazigEgypt Department of Mathematics Faculty of SciencealmithnabQassim UniversityP.O.Box 6666AlmithnabKingdom of Saudi Arabia

The present paper is aimed at studying the effect of rotation on the general model of the equations of the generalized thermo-microstretch for a homogeneous isotropic elastic half-space solid, whose surface is subjected to a Mode-I crack problem. The problem is studied in the context of the generalized thermoelasticity Lord Shulman＇s （L-S） theory with one relaxation time, as well as with the classical dynamical coupled theory （CD）. The normal mode analysis is used to obtain the exact expressions for the displacement components, the force stresses, the temperature, the couple stresses and the microstress distribution. The variations of the considered variables through the horizontal distance are illustrated graphically. Comparisons of the results are made between the two theories with and without the rotation and the microstretch constants.

关键词： Lord-Shulman's theory thermoelasticity microrotation microstretch

Some studies of the interaction between two two-level atoms and SU(1,1) quantum systems

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Chinese Physics B 2018年第10期27卷 116-122页

作者： T M El-Shahat M kh Ismail Faculty of Science Al-Azhar University. Assiut 71524 Egypt

Herein, we present an approach to look for the best phenomenon to measure quantum correlation. The system of two isolated qubits each interacting with a single-mode cavity was theoretically created to study the quantum correlation. Some of the phenomena, such as the quantum discord and concurrence, were generated through such a system. The influences of initial state purity, qubit motion, and detuning parameters were discussed for the phenomena. These parameters for a specific value show that the behavior of phenomena are analogous. It is interesting to mention that some values of detuning undergo a sudden death of phenomena, and the quantum discord still captures the qubits quantum correlation. We predict that the quantum discord may be a better measure of quantum correlation than concurrence.

关键词： an isolated atom with a cavity SU (1,1) quantum discord concurrence

Numerical modeling of vibration fatigue of viscoelastic pipelines conveying pulsating fluid flow

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International Journal of Modeling, Simulation, and Scientific Computing 2020年第3期11卷 117-134页

作者： kh.M.Komilova Department of Higher Mathematics Tashkent Institute of Irrigation and Agricultural Mechanization Engineers Tashkent Uzbekistan

The effect of investigation results on viscoelastic properties of the material and bases on vibration fatigue of a pipeline conveying pulsating fluid flow is given in the paper.A mathematical model of viscoelastic pipeline vibrations based on the theory of beams was developed when a pulsating fluid flows through it.A computational algorithm has been developed to solve vibration problems of composite pipelines conveying pulsating *** and amplitude-time characteristics of vibrations of composite pipelines conveying pulsating fluid were studied at wide range of parameters variation of deformable systems and fluid flow.

关键词： Numerical simulation vibration pulsating fluid pipeline critical rate