检索结果-南通市图书馆

Magnetic Field of a Compact Spherical Star under f(R,T) Gravity

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2018年第9期35卷 104-108页

作者： Safiqul islam Shantanu Basu Harish-Chandra Research Institute HBNI Department of Physics and Astronomy The University of Western Ontario

We present the interior solutions of distributions of magnetized fluid inside a sphere in f（R, T） gravity. Tile magnetized sphere is embedded in an exterior Reissner NordstrOm metric. We assume that all physical quantities are in static equilibrium. The perfect fluid matter is studied under a particular form of the Lagrangian density f（R, T）. The magnetic field profile in modified gravity is calculated. Observational data of neutron stars are used to plot suitable models of magnetized compact objects. We reveal the effect of f（R, T） gravity on the magnetic field profile, with application to neutron stars, especially highly magnetized neutron stars found in x-ray pulsar systems. Finally, the effective potential Veff and innermost stable circular orbits, arising out of the motion of a test particle of negligible mass influenced by attraction or repulsion from the massive center, are discussed.

关键词： Gravity Magnetic Field of a Compact Spherical Star under f R,T

Influence of binder composition on the rheological behavior of injection-molded microsized SiC suspensions

在线全文

学校读者我要写书评

暂无评论

Journal of University of Science and Technology Beijing 2008年第3期15卷 297-301页

作者： islam S.Humail School of Materials Science and Engineering University of Science and Technology Beijing

The influence of four kinds of binders consisting of paraffin wax （PW）, random-polypropylene （RPP）, high-density polyethylene （HDPE）, and stearic acid （SA） on the theological behavior of injection-molded SiC feedstocks was investigated over a temperature range of 150℃ to 180℃ and a shear rate range of 4 s^-1 to 1259 s^^-1. The results showed that all the feedstocks exhibited pseudoplastic flow behavior. The wax-based binder of multipolymer components （PW-RPP-HDPE） exhibited better comprehensive rheological properties compared with the binder of monopolymer components （PW-RPP or PW-HDPE）. The addition of 5wt% SA to the binder could reduce the viscosity of the feedstock but enhance the rheological stability by improving the wettability between the binder and the SiC powder. The binder of 65wt% PW ＋ 15wt% HDPE ＋ 15wt% RPP ＋ 5wt% SA was found to be a better binder for microsized SiC injection molding.

关键词： SiC powder injection molding rheology binder

Morphology and microstructure characterization of 95W-3.5Ni-1.5Fe powder prepared by mechanical alloying

在线全文

学校读者我要写书评

暂无评论

Journal of University of Science and Technology Beijing 2006年第5期13卷 442-445页

作者： islam S. Humail Key Laboratory for Advanced Metals and Materials Materials Science and Engineering SchoolUniversity of Science and Technology Beijing

The mechanism of mechanical solid-state reactions for formation of tungsten heavy alloy powder was discussed. A highenergy ball mill operating at room temperature was used for preparing tungsten heavy alloy powders, starting from elemental tungsten （W）, nickel （Ni）, and iron （Fe） powders. X-ray diffraction （XRD）, particle size analyzer, scanning electron microscopy （SEM）, and transmission electron microscopy （TEM） were used to follow the progress of the mechanical solid-state reaction of W, Ni, and Fe powders. These morphological studies revealed three stages in the milling process. In the first stage, the particle deformation changes the irregular structure of the as-received powder particles to flattened morphology, and the average particle size increases. In the second stage, the powder is sufficiently deformed and the tendency to fracture predominates over welding, and the particle size decreases. With continuous milling, the system reaches steady state, and relatively small and uniform particle size distribution is obtained after 20 h of milling.

关键词： tungsten heavy alloys mechanical alloying particle size morphology

Variation of the mechanical properties of tungsten heavy alloys tested at different temperatures

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2011年第4期30卷 392-395页

作者： S.H.islam Research Center College of EngineeringKing Saud University

The high-temperature mechanical properties of 95W-3.5Ni-1.5Fe and 95W-4.5Ni-0.5Co alloys were investigated in the temperature range of room temperature to1100℃. The yield strength and tensile strengths declined gradually, and the ductility of both alloys increased as the testing temperature was increased to 300℃. All the three properties reached a plateau at temperatures between 300 and 500℃ in the case of 95W-3.5Ni-l.5Fe and at temperatures between 350 and 700℃ in the case of 95W-4.5Ni-0.5Co. Thereafter, the ductility as well as yield and tensile strengths decreased considerably.

关键词： liquid phase sintering tungsten alloys tensile testing mechanical properties

Linear feedback-based control of blood glucose in a modified model for glucose-insulin kinetics： A theoretical study

在线全文

学校读者我要写书评

暂无评论

International Journal of Biomathematics 2017年第4期10卷 153-172页

作者： Amit Mondal Mitul islam Nurul islam Department of Mathematics Jafarpur Kashinath High School P. O. Champahati P. S. Sonarpur 24 Pgs(S) Pin 743330 India Indian Statistical Institute 203 B. T. Road Kolkata 700108 India Department of Mathematics Ramakrishna Mission College (Autonomous) Narendrapur Kolkata 700103 India

In this paper, we present a modified minima] model for glucose and insulin kinetics model. The model proposed here is a smooth approximation of the original non-smooth minimal model. The dynamical properties like dissipativity, existence of equilibrium and stability of the system at the equilibrium points are investigated. A linear feedback-based control strategy is studied to control the blood glucose level in the situation where the physical system fails to regulate the blood glucose level automatically. A critical control parameter value kc is determined in terms of the system parameters. Extensive numerical simulation is performed with different parameter sets. Assuming different values for the feedback gain parameter, ranges of physiological parameter a are determined where the feedback gain is sufficient to stabilize the control system.

关键词： Stability analysis control glucose and insulin kinetics minimal model.

Muscle protein expression of pikeperches (Stizostedion lucioperca and S. volgense)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Integrative Zoology 2006年第2期1卷 96-103页

作者： Asiful islam Harvard Medical School Harvard UniversityBostonMassachusettsUSA

The purpose of the present study was to investigate the muscle protein expression in two pikeperches(Stizostedion lucioperca and ***)through intra-and intermyomeric composition of white *** denaturing 10%sodium dodecylsulfate-polyacrylamide gel electrophoresis,muscle protein expression was studied in relation to within-and between-species morphological development,sex,maturity and age of ***,actin and troponin have a distinct role in the contraction and length tension of muscle fibers of these *** obvious intramyomeric differences were found in the myosin heavy chain of both *** light chains(15-38 kDa)have different expression in different age *** muscle protein of the fingerling and adult *** had high molecular weight(50 kDa)myosin in contrast to the other Percid *** molecular weight of actins increased comparatively in low-age-group *** is stored in myosin and released to cause contraction when myosin comes in contact with actin of the experimental *** regulates increasing concentration of lightchain myosin in mature *** troponin T has been implicated in the regulation of skeletal muscle kinetics,muscle contraction kinetics was predicted in different age *** muscle proteins of both sexes of these species have polymorphism in various age groups but have no difference in similar aged *** muscle protein dimorphism was found in these Percid *** white muscle protein composition and contractile properties affect power production during fast,unsteady movement and swimming.

关键词： actin myosin pikeperch Stizostedion lucioperca S.volgense troponin

Effect of Trimetazidine on Functional Capacity in Patient with Ischaemic Cardiomyopathy (TOFCAPI)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Clinical Medicine 2024年第2期15卷 55-67页

作者： Mohsin Ahmed Golam Morshed Mahmood Hasan Khan Md. Arifur Rahman Muhammed Aminur Razzaque Shariful islam Sayeedur Rahman Khan Chowdhury Md. Kudrat-E-Khuda Salahuddin Anis Shiblee Md. Habibur Rahman Department of Cardiology National Institute of Cardiovascular Diseases Dhaka Bangladesh Department of Cardiology Government Employee’s Hospital Dhaka Bangladesh Department of Cardiology Delta Hospital Ltd. Dhaka Bangladesh IPDI Foundation Dhaka Bangladesh

Objective: This study aimed to evaluate the efficacy of trimetazidine on exercise capacity via a six-minute walk test in patients with ischaemic cardiomyopathy and also evaluate the effect of trimetazidine on left ventricular function via echocardiography in the same population. Methods: This prospective observational study, conducted at the National Institute of Cardiovascular Diseases in Dhaka, Bangladesh, enrolled 200 patients with ischaemic cardiomyopathy and a depressed left ventricular ejection fraction (LVEF Results: In this study (n = 200) of ischaemic cardiomyopathy patients, the mean age was 58 years, with 76% of the patients being male. All study subjects received GDMT (Guideline-Directed Medical Therapy) for angina and heart failure. Those who received the modified released form of trimetazidine developed lesions during the 1st and 2nd follow-ups, during which the LVEF, LVIDd, and six-minute walk distance significantly improved (p Conclusion: The findings of the present study demonstrated that the addition of modified-release trimetazidine to GDMT can improve exercise capacity and left ventricular function in patients with ischaemic cardiomyopathy.

关键词： Bangladesh Heart Failure Exercise Capacity Trimetazidine Ischaemic Cardiomyopathy

An Efficient Approach for Transforming Unbalanced Transportation Problems into Balanced Problems in Order to Find Optimal Solutions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Statistical optimization of stress level in Mg-Li-Al alloys upon hot compression testing

American Journal of Operations Research（美国运筹学期刊） 2024年第1期

作者： Abdur Rashid Md. Amirul islam

来源：博看期刊评论

在线全文

博看期刊

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2019年第2期7卷 203-217页

作者： Rezawana islam Meysam Haghshenas Department of Mechanical Engineering University of North DakotaGrand ForksNDUSA

In the present study,a response optimization method using Extreme Vertices Mixer Design(EVMD)approach is proposed for stress optimization in a thermomechanically processed Mg-Li-Al *** was planned as per mixed design proportions of Mg,Li and Al and process variables(*** and strain rate).Each experiment has been performed under different conditions of factors proportions and process *** response,particularly stress has been considered for each *** response is optimized to find an optimum condition when the contributing factors influence material characteristics in such a way,to achieve better strength,ductility and corrosion *** regression coefficient table for response has been observed to identify the important factors in this process and significantly high variance inflation factor has been *** importantly,an optimum condition is achieved from this analysis which fulfills the experimental observations and theoretical assumptions.

关键词： Mg-Li-Al alloy Design of experiments(DOE) Extreme vertices mixture design(EVMD) Stress optimization