检索结果-南通市图书馆

Locally Rotationally Symmetric Bianchi Type-II Magnetized String Cosmological Model with Bulk Viscous Fluid in General Relativity

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2011年第8期28卷 364-367页

作者： Atul tyagi Keerti Sharma Department of Mathematics and Statistics University College of ScienceMLS UniversityUdaipur 313001(Raj.)India Department of Mathematics Medi-caps Institute of Technology and ManagementIndore(MP)India

The locally rotationally symmetric Bianchi type-II magnetized string cosmological model with bulk viscous fluid is *** magnetic field is due to an electric current produced along the x−*** the magnetic field is in the y–z plane and F23 is the only non−vanishing component of electromagnetic field tensor *** obtain the deterministic model in terms of cosmic time t,we have assumed the conditionξθ=const,whereξis the coefficient of bulk viscosity andθis the expansion in the model.

关键词： Bianchi string Cosmo

Bianchi Type-V Magnetized String Cosmological Model with Variable Magnetic Permeability for Viscous Fluid distribution

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2010年第8期27卷 275-278页

作者： Atul tyagi Keerti Sharma Department of Mathematics and Statistics College of Science MLS University Udaipur 313001 India Department of Mathematics Medi-Caps Institute of Technology and Management A.B. Road Pigdambar Indore 453331 India

We investigate the Bianchi type-V magnetized string cosmological model with variable magnetic permeability for viscous fluid distribution. The magnetic field is due to an electric current produced along the x-axis. Thus the magnetic field is in yz-plane and F23 is the only non-vanishing component of electromagnetic field tensor Fij. To obtain the deterministic model in terms of cosmic time t, we assume the condition ξθ const where ξ is the coefficient of bulk viscosity and θ the expansion in the model.

关键词： Models Magnetic field Electricity Fields

Artificial neural network based modeling of liquid membranes for separation of dysprosium

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2023年第3期41卷 440-445,I0005页

作者： Jawad Iqbal Arjun tyagi Manish Jain Department of Applied Chemistry Delhi Technological UniversityDelhi110042India

In recent years,the liquid membrane process has been widely investigated to remove rare earth ***,transport modeling of this process requires the accurate values of several parameters,which are difficult to ***,the accurate simulation of this process is a challenging *** this study,the artificial neural network(ANN)based approach is used to model the liquid membrane process for removing *** results from a previous study were used to train the ***,the number of neurons in the hidden layer was *** minimum mean squared error between experimental results and model predictions is found with ten *** predictions were successfully validated with experimental results with correlation factor(R)of 0.9987,which confirms the authenticity of the trained *** ANN was then used to study the effects of different operating parameters on transport *** higher volume ratio of membrane solution to feed solution(3-4)with 50-60 min of operation,higher feed pH(5),HCl concentration in stripping solution of 2 mol/L,and moderate concentration of carrier species(0.5 mol/L)with 0.5×10^(-4) mol/L dysprosium initial concentration are found to be optimum values of operating conditions for maximizing the transport rate.

关键词： Rareearth metal separation Artificial neural network Dysprosium separation Liquid membranes

Exosomes in neurological disease, neuroprotection, repair and therapeutics: problems and perspectives

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2015年第10期10卷 1565-1567页

作者： Anuradha Kalani Neetu tyagi Department of Physiology and Biophysics School of Medicine University of Louisville

Exosomes：Exosomes are a sub-population of micro-vesicles ranging from 40–100 nm that were earlier thought as artefacts under electron *** recently came into attention for their storage of biological information,cell-to-cell communication,serving as biomarkers and potential use in neural protection and regeneration （Kalani et al., 2013, 2014a）.

关键词： Exosomes in neurological disease neuroprotection problems and perspectives repair and therapeutics

Bianchi Type-IX String Cosmological Models for Perfect Fluid Distribution in General Relativity

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2010年第7期27卷 299-301页

作者： Atul tyagi Keerti Sharma Payal Jain Department of Mathematics and Statistics College of Science MLS University Udaipur-313001 India Department of Mathematics Techno India NJR Institute of Technology Udaipur-313004 India

The present study deals with Bianchi type-IX string cosmological models for perfect fluid distribution. We consider two cases：（i） ρ ＋ λ = 0, （ii） ρ - λ = 0, where ρ and λ are the rest energy density and the tension density of a string cloud, respectively. The physical and geometrical properties of the models are discussed.

关键词： Models Dormancy Density

Application of Fractional Order PID Controller for AGC Under Deregulated Environment

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 Automation and computing 2018年第1期15卷 84-93页

作者： Nagendra Kumar Barjeev tyagi Vishal Kumar Department of Electrical Engineering Indian Institute of Technology

In this paper, a fractional order proportional integral derivative （FOPID） controller for multiarea automatic generation control （AGC） scheme has been designed. FOPID controller has five parameters and provides two additional degrees of flexibility in comparison to a proportional integral derivative （PID） controller. The optimal values of parameters of FOPID controller have been determined using Big Bang Big Crunch （BBBC） search algorithm. The designed controller regulates real power output of generators to achieve the best dynamic response of frequency and tie-line power on a load perturbation. The complete scheme for designing of the controllers has been developed and demonstrated on multiarea deregulated power system. The performance of the designed FOPID controllers has been compared with the optimally tuned PID controllers. It is observed from the results that the FOPID controller shows a considerable improvement in the performance as compared to the conventional PID controller.

关键词： Automatic generation control (AGC) deregulation Big Bang Big Brunch (BBBC) algorithm fractional order propor-tional integral derivative (FOPID) controller optimization.

Genes and genetics in eye diseases: a genomic medicine approach for investigating hereditary and inflammatory ocular disorders

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2018年第1期11卷 117-134页

作者： Mahavir Singh Suresh C tyagi Eye and Vision Science Laboratory Department of Physiology University of Louisville School of Medicine

Past 25 y have witnessed an exponential increase in knowledge and understanding of ocular diseases and their respective genetic underpinnings. As a result, scientists have mapped many genes and their variants that can influence vision and health of our eyes. Based on these findings, it is becoming clear that an early diagnosis employing genetic testing can help evaluate patients＇ conditions for instituting treatment plan（s） and follow-up care to avoid vision complications later. For example, knowing family history becomes crucial for inherited eye diseases as it can benefit members in family who may have similar eye diseases or predispositions. Therefore, gathering information from an elaborate examination along with complete assessment of past medical illness by ophthalmologists followed by consultation with geneticists can help create a roadmap for making diagnosis and treatment precise and beneficial. In this review, we present an update on ocular genomic medicine that we believe has tremendous potential towards unraveling genetic implications in ocular diseases and patients＇ susceptibilities. We also discuss translational aspects of genetic ophthalmology and genome engineering that may help advance molecular diagnostics and therapeutics.

关键词： CRISPR/Cas9 precision medicine genetic ophthalmology genome engineering inflammation single nucleotide polymorphism

Metalloproteinases as mediators of inflammation and the eyes： molecular genetic underpinnings governing ocular pathophysiology

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 Ophthalmology(English edition) 2017年第8期10卷 1308-1318页

作者： Mahavir Singh Suresh C tyagi Eye and Vision Science Laboratory Department of Physiology University of Louisville School of Medicine Louisville KY 40202 USA

There are many vision threatening diseases of the eye affecting millions of people worldwide. In this article, we are summarizing potential role of various matrix metalloproteinases （MMPs）; the Zn （2＋）-dependent endoproteases in eye health along with pathogenesis of prominent ocular diseases such as macular degeneration, diabetic retinopathy, and glaucoma via understanding MMPs regulation in affected patients, interactions of MMPs with their substrate molecules, and key regulatory functions of tissue inhibitor of metalloproteinases （TIMPs） towards maintaining overall homeostasis.

关键词： age-related macular degeneration choroidal neovascularization diabetes glaucoma metalloproteinases tissue inhibitors of metalloproteinases

Investigation of Weakly Relativistic Ponderomotive Effects on Self-Focusing During Interaction of High Power Elliptical Laser Beam with Plasma

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2017年第8期67卷 245-249页

作者： Keshav Walia Deepak Tripathi Yachna tyagi Department of Physics DAV University Jalandhar Department of Physics AIAS Amity University Noida

This paper presents an investigation of weakly relativistic ponderomotive effects on self-focusing during interaction of high power elliptical laser beam with plasma. The nonlinear differential equations for the beam width parameters of elliptical laser beam have set up by using Wentzal–Krammers–Brillouin(WKB) and paraxial approximations. These equations have been solved numerically by using fourth order Runge–Kutta method to study the variation of these beam width parameters against normalized distance of propagation. Effects of variation in laser beam intensity,plasma density and electron temperature on the beam width parameters are also analyzed.

关键词： self-focusing elliptical laser beam weakly relativistic ponderomotive effects plasma density elec-tron temperature