检索结果-南通市图书馆

Electro-osmotic flow of a second-grade fluid in a porous microchannel subject to an AC electric field

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2013年第2期25卷 309-316页

作者： misra J. C. CHANDRA s. Department of Mathematics Institute of Technical Education and Research Siksha O Anusandhan University Department of Physics Sabang S. K. Mahavidyalaya Vidyasagar University

studies on electro-osmotic flows of various types of fluids in microchannel are of great importance owing to their multifold applications in the transport of liquids, particularly when the ionized liquid flows with respect to a charged surface in the presence of an external electric field. In the case of viscoelastic fluids, the volumetric flow rate differs significantly from that of Newtonian fluids, even when the flow takes place under the same pressure gradient and the same electric field. With this end in view, this paper is devoted to a study concerning the flow pattern of an electro-osmotic flow in a porous microchannel, which is under the action of an alternating electric field. The influence of various rheological and electro-osmotic parameters, e.g., the Reynolds number, Debye-Huckel parameter, shape factor and fluid viscoelasticity on the kinematics of the fluid, has been investigated for a secondgrade viscoelastic fluid. The problem is first treated by using analytical methods, but the quantitative estimates are obtained numerically with the help of the software MATHEMATICA. The results presented here are applicable to the cases where the channel height is much greater than the thickness of the electrical double layer comprising the stern and diffuse layers. The study reveals that a larger value of the Debye-Huckel parameter creates sharper profile near the wall and also that the velocity of electro-osmotic flow increases as the permeability of the porous microchannel is enhanced. The study further shows that the electro-osmotic flow dominates at lower values of Reynolds number. The results presented here will be quite useful to validate the observations of experimental investigations on the characteristics of electro-osmotic flows and also the results of complex numerical models that are necessary to deal with more realistic situations, where electro-osmotic flows come into the picture, as in blood flow in the micro-circulatory system subject to an elect

关键词： electrical double layer Debye length second-grade fluid Ionic energy

Peristaltic transport of rheological fluid:model for movement of food bolus through esophagus

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2012年第3期33卷 315-332页

作者： J.C.misra s.MAITI Department of Mathematics Institute of Technical Education and ResearchSiksha 'O' Anusandhan UniversityBhubaneswar 751030India school of Medical science and Technology & Center for Theoretical studies Indian Institute of TechnologyKharagpur 721302India

Fluid mechanical peristaltic transport through esophagus is studied in the paper. A mathematical model has been developed to study the peristaltic transport of a rheological fluid for arbitrary wave shapes and tube lengths. The Ostwald-de Waele power law of a viscous fluid is considered here to depict the non-Newtonian behaviour of the fluid. The model is formulated and analyzed specifically to explore some important information concerning the movement of food bolus through esophagus. The analysis is carried out by using the lubrication theory. The study is particularly suitable for the cases where the Reynolds number is small. The esophagus is treated as a circular tube through which the transport of food bolus takes place by periodic contraction of the esophageal wall. Variation of different variables concerned with the transport phenomena such as pressure, flow velocities, particle trajectory, and reflux is investigated for a single wave as well as a train of periodic peristaltic waves. The locally variable pressure is seen to be highly sensitive to the flow index ＂n＂. The study clearly shows that continuous fluid transport for Newtonian/rheological fluids by wave train propagation is more effective than widely spaced single wave propagation in the case of peristaltic movement of food bolus in the esophagus.

关键词： non-Newtonian fluid food bolus esophagus peristaltic transport flow reversal single wave wave train particle trajectory

Comprehensive spectral analysis of Cyg X-1 using RXTE data

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2012年第10期12卷 1427-1438页

作者： Rizwan shahid Ranjeev misra s.N.A.Jaaffrey Department of Physics M.L.Sukhadia UniversityUdaipur-313001India Inter University Centre for Astronomy and Astrophysics Pune-411007India

We analyze a large number （〉 500） of pointed Rossi X-Ray Timing Explorer （RXTE） observations of Cyg X- 1 and model the spectrum of each one. A subset of the observations for which there is a simultaneous reliable measure of the hardness ratio by the All sky Monitor shows that the sample covers nearly all the spectral shapes of Cyg X-1. Each observation is fitted with a generic empirical model consisting of a disk black body spectrum, a Comptonized component whose input photon shape is the same as the disk emission, a Gaussian to represent the iron line and a reflection feature. The relative strength, width of the iron line and the reflection parameter are in general correlated with the high energy photon spectral index F. This is broadly consistent with a geometry where for the hard state （low F ~ 1.7） there is a hot in- ner Comptonizing region surrounded by a truncated cold disk. The inner edge of the disk moves inwards as the source becomes softer till finally in the soft state （high F 〉 2.2） the disk fills the inner region and active regions above the disk produce the Comptonized component. However, the reflection parameter shows non-monotonic behavior near the transition region （F ~ 2）, which suggests a more complex geometry or physical state of the reflector. In addition, the inner disk temperature, during the hard state, is on average higher than in the soft one, albeit with large scatter. These inconsistencies could be due to limitations in the data and the empirical model used to fit them. The flux of each spectral component is well correlated with F, which shows that unlike some other black hole systems, Cyg X- 1 does not show any hysteresis be- havior. In the soft state, the flux of the Comptonized component is always similar to the disk one, which confirms that the ultra-soft state （seen in other brighter black hole systems） is not exhibited by Cyg X-1. The rapid variation of the Compton amplifica- tion factor with F naturally explains the absence of spec

关键词： accretion accretion disks -- X-rays: binaries

Flow of a micropolar fluid in a micro-channel under the action of an alternating electric field: Estimates of flow in bio-fluidic devices

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2015年第3期27卷 350-358页

作者： misra J.C. CHANDRA s. HERWIG H. Centre for Healthcare science and Technology Indian Institute of Engineering Science and Technology Department of Physics Sabang S. K. Mahavidyalaya Vidyasagar University Institute of Thermo-Fluid Dynamics Technische Universitat Hamburg-Harburg

The paper is devoted to a study of the electro-osmotic flow of a micropolar bio-fluid, when the flow takes place between two plates that are in a state of periodic vibrations. Considering blood as a micropolar fluid, it is found that the amplitude of oscillation of the microparticles of blood increases when the micropolar effect is pronounced more and more and that a rise in DebyeHtickel parameter enhances both the velocity and microrotation gradient. The results provide guidelines for the improvement of design of bio-sensing and micro-fluidic devices. The study leads to the conclusion that electrical double layers formed in the vicinity of the wall can significantly alter the flow dynamics of physiological fluids in micro-bio-fluidic devices.

关键词： microrotation Electro-osmotic flow Debye-Hiickel parameter micropolar fluid

Integrating Qos Management in TLMM:Three Level Mobility Model for Next Generation Wireless IP-Based Networks

在线全文

学校读者我要写书评

暂无评论

China Communications 2008年第3期5卷 125-139页

作者： M.Chakraborty I.s.misra A.Mukherjee Department of Information Technology Institute of Engineering & Management Department of Electronics and Telecommunication Engineering Jadavpur University IBM Global services

In this paper we have designed an implemented an integrated framework of Qos for Three Level Mobility Model(TLMM),which has been recently proved to be the optimal mobility management solution for next generation wireless IP-based *** Qos solution uses a combination of Intserv and Diffserv models incorporated in TLMM *** paper also proposes an effi cient dynamic handover policy that takes care of false *** and analytical results have shown that this infrastructure guarantees eff icient Qos handling and scalability among end *** provide a comparative understanding of the Qos mechanism and signaling load of TLMM we have used TeleMIP(without Qos support) and MIP as alternative mobility management protocols.

关键词： Qos NGN wireless IP network

Electroosmotic oscillatory flow of micropolar fluid in microchannels:application to dynamics of blood flow in microfluidic devices

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2014年第6期35卷 749-766页

作者： J.C.misra s.CHANDRA G.C.sHIT P.K.KUNDU Department of Mathematics Institute of Technical Education and ResearchSiksha O Anusandhan University Department of Mathematics Jadavpur University

The electroosmotic flow of a micropolar fluid in a microchannel bounded by two parallel porous plates undergoing periodic vibration is studied. The equations for conservation of linear and angular momentums and Gauss＇s law of charge distribution are solved within the framework of the Debye-Hückel approximation. The fluid velocity and microrotation are assumed to depend linearly on the Reynolds number. The study shows that the amplitude of microrotation is highly sensitive to the changes in the magnitude of the suction velocity and the width of the microchannel. An increase in the micropolar parameter gives rise to a decrease in the amplitude of microrotation. Numerical estimates reveal that the microrotation of the suspended microelements in blood also plays an important role in controlling the electro-osmotically actuated flow dynamics in microbio-fluidic devices.

关键词： blood flow electrohydrodynamic effect microfluidics channel flow

An anisotropic propagation technique for synthesizing hyperbranched polyvillic gold nanoparticles

在线全文

学校读者我要写书评

暂无评论

Nano Research 2016年第10期9卷 2889-2903页

作者： Aaron s. schwartz-Duval santosh K. misra Prabuddha Mukhejee Elyse Johnson Alvin s. Acerbo Dipanjan Pan Department of Bioengineering and Beckman Institute University of Illinois Urbana-Champaign Urbana 61801 USA Biomedical Research Center Carle Foundation Hospital Urbana 61801 USA Cytoviva Inc. Auburn 36830 USA Center for Advanced Radiation sources The University of Chicago Chicago 60637 USA

Of late, many synthesis processes have been studied to develop irregular nano-rnorphologies of gold nanostructures for biomedical applications in order to increase the efficacy of nanoparticle theranostics, tune the plasmonic absorbance spectra, and increase the sensitivity of biomolecule detection through surface enhanced Raman spectroscopy. Here we report, a novel, non-seed mediated versatile single pot synthesis method capable of producing hyperbranched gold ＂nano-polyvilli＂ with more than 50-90 branching nanowires propagating from a single origin within each structure. The technique was capable of achieving precise tuning of the branch propagation where the branching could be controlled by varying the duration of incubation, temperature, and hydrogen ion concentration.

关键词： gold nanoparticles surface enhanced Raman spectroscopy (sERs) anisotropy asymmetric nanocrystallization

Emplacement of Dyke swarms, Cretaceous Volcanism and Development of Petroliferous Basins in and around Peninsular India

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Geologica sinica(English Edition) 2016年第S1期90卷 59-60页

作者： Kiran.s.misra Anshuman misra University of Petroleum and Energy studies Kumaun University

We illustrate intricate genetic relationship between prolonged extensional tectonics,formation of several sedimentary basins,enormous Cretaceous volcanism and emplacement of great dyke swarms as well assequential

关键词： Cretaceous Volcanism and Development of Petroliferous Basins in and around Peninsular India Emplacement of Dyke swarms

Extensional Tectonics, Rifting, Formation of sedimentary Basins, Cretaceous Volcanism, Emplacement of Dyke swarms and Development of Hydrocarbon Pools: Case studies from Peninsular India and Indian Ocean Region

在线全文

学校读者我要写书评

暂无评论

Acta Geologica sinica(English Edition) 2016年第S1期90卷 61-62页

作者： K.s.misra University of Petroleum and Energy studies Kumaun University

Prolonged extensional regime in peninsular India resulted in formation of rift and grabens,elongated basins and Gondwana sedimentation along *** progression of rift related faults caused decompression

关键词： Extensional Tectonics Formation of sedimentary Basins Rifting Cretaceous Volcanism Emplacement of Dyke swarms and Development of Hydrocarbon Pools