检索结果-南通市图书馆

Quadratic convective flow of radiated nano-Jeffrey liquid subject to multiple convective conditions and Cattaneo-Christov double diffusion

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2018年第9期39卷 1311-1326页

作者： P.b.SAMPATH KUMAR b.MAHANTHESH b.J.GIREESHA S.A.SHEHZAD Department of Studies and Research in Mathematics Kuvempu University Department of Mathematics Christ University Department of Mathematics COMSATS Institute of Information Technology

A nonlinear flow of Jeffrey liquid with Cattaneo-Christov heat flux is investigated in the presence of nanoparticles. The features of thermophoretic and brownian movement are retained. The effects of nonlinear radiation, magnetohydrodynamic(MHD), and convective conditions are accounted. The conversion of governing equations into ordinary differential equations is prepared via stretching transformations. The consequent equations are solved using the Runge-Kutta-Fehlberg(RKF) method. Impacts of physical constraints on the liquid velocity, the temperature, and the nanoparticle volume fraction are analyzed through graphical illustrations. It is established that the velocity of the liquid and its associated boundary layer width increase with the mixed convection parameter and the Deborah number.

关键词： nonlinear convection Jeffrey liquid nanoliquid convective condition thermophoretic brownian motion

Alloy design by dislocation engineering

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2018年第3期34卷 417-420页

作者： M.X.Huang b.b.He Department of Mechanical Engineering The University of Hong Kong

Ultra-high strength alloys with good ductility are ideal materials for lightweight structural application in various industries. However, improving the strength of alloys frequently results in a reduction in ductility, which is known as the strength-ductility trade-off in metallic materials. Current alloy design strategies for improving the ductility of ultra-high strength alloys mainly focus on the selection of alloy composition （atomic length scale） or manipulating ultra-fine and nano-grained microstructure （grain length scale）. The intermediate length scale between atomic and grain scales is the dislocation length scale. A new alloy design concept based on such dislocation length scale, namely dislocation engineering, is illustrated in the present work. This dislocation engineering concept has been successfully substantiated by the design and fabrication of a deformed and partitioned （D＆P） steel with a yield strength of 2,2 GPa and an uniform elongation of 16%. In this D＆P steel, high dislocation density can not only increase strength but also improve ductility. High dislocation density is mainly responsible for the improved yield strength through dislocation forest hardening, whilst the improved ductility is achieved by the glide of intensive mobile dislocations and well-controlled transformation-induced plasticity （TRIP） effect, both of which are governed by the high dislocation density resulting from warm rolling and martensitic transformation during cold rolling. In addition, the present work proposes for the first time to apply such dislocation engineering concept to the quenching and partitioning （Q＆P） steel by incorporating a warm rolling process prior to the quenching step, with an aim to improve simultaneously the strength and ductility of the Q＆P steel. It is believed that dislocation engineering provides a new promising alloy design strategy for producing novel strong and ductile alloys.

关键词： Alioy design Dislocation engineering D&P steel Q&P steel TRIP Warm rolling

Aerosol jet printed capacitive strain gauge for soft structural materials

在线全文

学校读者我要写书评

暂无评论

npj Flexible Electronics 2020年第1期4卷 279-287页

作者： Kiyo T.Fujimoto Jennifer K.Watkins Timothy Phero Doug Litteken Kevin Tsai Takoda bingham Kshama Lakshmi Ranganatha benjamin C.Johnson Zhangxian Deng brian Jaques David estrada Center for Advanced Energy Studies Boise State UniversityIdaho FallsIDUSA Micron School of Materials Science and Engineering Boise State UniversityBoiseIDUSA Measurement Sciences Department Idaho National LaboratoryIdaho FallsIDUSA Department of Advanced Fuel Manufacturing and Development Idaho National LaboratoryIdaho FallsIDUSA NASA Johnson Space Center HoustonTXUSA Department of Mechanical and biomedical Engineering Boise State UniversityBoiseIDUSA Department of Electrical and Computer Engineering Boise State UniversityBoiseIDUSA

Soft structural textiles,or softgoods,are used within the space industry for inflatable habitats,parachutes and decelerator *** the safety and structural integrity of these systems occurs through structural health monitoring systems(SHM),which integrate non-invasive/non-destructive testing methods to detect,diagnose,and locate ***/load monitoring of these systems is limited while utilizing traditional strain gauges as these gauges are typically stiff,operate at low temperatures,and fail when subjected to high strain that is a result of high loading classifying them as unsuitable for SHM of soft structural *** this work,a capacitance based strain gauge(CSG)was fabricated via aerosol jet printing(AJP)using silver nanoparticle ink on a flexible polymer *** strain gauges were then compared to a commercially available high elongation resistance-based strain gauge(HE-RSG)for their ability to monitor strained Kevlar straps having a 26.7 kN(6 klbf)***,static and cyclic loads were used to characterize both types of strain monitoring *** CSGs demonstrated superior performance for high elongation strain measurements when compared to commonly used HE-RSGs,and were observed to operate with a gauge factor of 5.2 when the electrode arrangement was perpendicular to the direction of strain.

关键词： strain gauge structural

Proton-halo breakup dynamics for the breakup threshold in theε0→0 limit

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

Chinese Physics C 2021年第5期45卷 166-172页

作者： b.Mukeru Department of Physics University of South AfricaP.O.Box 392Pretoria 0003South Africa

Proton-halo breakup behavior in theε0→0 limit(whereε0 is the ground-state binding energy)is stud-ied around the Coulomb barrier in the^(8)b+^(58)Ni reaction for the first *** practical purposes,apart from the ex-perimental 8b binding energy of 137 keV,three more arbitrarily chosen values(1,0.1,0.01 keV)are *** is first shown that the Coulomb barrier between the core and the proton prevents the^(7)be+p system from reaching the state of an open proton-halo system,w hich,among other factors,would require the ground-state wave function to extend to infinity in the asymptotic region,asε0→*** elastic scattering cross section,which depends on the density of the ground-state wave function,is found to have a negligible dependence on the binding energy in this *** total,Coulomb and nuclear breakup cross sections are all reported to increase significantly fromε0=137 to 1.0 keV,and converge to their maximum values asε0→*** increase is mainly understood as coming from a longer tail of the ground-state wave function forε0≤1.0 keV,compared to that forε0=137 *** is also found that the effect of the continuum-continuum couplings is to slightly delay the convergence of the breakup cross *** analysis of the reaction cross section indicates a convergence of all the breakup observables asε0→*** results provide a better sense of the dependence of the breakup process on the breakup threshold.

关键词： proton halo breakup cross section breakup threshold

Non-Static Plane Symmetric Zeldovich Fluid Model In Scale Invariant Theory

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2004年第12期21卷 2359-2361页

作者： b.Mishra DepartmentofMathematics TheICFAIInstituteofScienceandTechnologyBhubaneswar751023India

The perfect fluid distribution in scale invariant theory of gravitation is studied, when the spacetime is described by non-static plane symmetric metric with a time-dependent gauge function. The Zeldovich model of the... 详细信息

关键词： Gravitation and cosmology Astrophysics and astroparticles

Computer Simulation of IT-diagrams of Steel

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

材料热处理学报 2004年第05B期25卷 706-709页

作者： b. Smoljan Faculty of Engineering Materials Science and Engineering Vukovarska 58 51000 Rijeka Croatia

Computer simulation of austenite decomposition has been investigated. The inversion method of prediction of phase portion in steel based on hardenability curve of /o/m’/ry-specimen has been established. The designed method of prediction austenite decomposition has been used in computer simulation of isothermal transformation (IT) diagram of low alloyed steel. IT-diagrams of low alloyed steel can be successfully predicted by proposed method of computer simulation.

关键词：计算机模拟奥氏体分解淬火转变图低合金钢

Study of D_s~±→μ~±V_μ at belle

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2008年第6期32卷 495-498页

作者： b.Golob Jozef Stefan Institute and Faculty of Mathematics and Physics Univ.of LjubljanaLjubljanaSlovenia

We present a preliminary measurement of the b（Ds→μvu） with the belle experiment at the KEKb collider. We select Ds →μvu decays with a method that provides a high-purity of the selected sample and an absolute measurement of the branching fraction. The results are based on a data sample of 550 fb^-1 and are compared to similar measurements by other experiments as well as to the predictions of LQCD. We conclude with short prospects for improvements in the accuracy of the measurement.

关键词： meson decays leptonic decays decay constant lattice QCD

Pattern Formation Around Interacting bodies in Rotating Fluids

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2006年第2期15卷 132-134页

作者： Karl bHLER University of Applied Sciences badstrasse 24 D-77652 Offenburg Germany

The interaction of bodies like spheres and disks in rotating fluids leads to novel flow structures. The primary swirling flow in circumferential direction is superimposed by a secondary motion in the meridional plane. The flow is visualized by introducing ink through a hole in the center of the axes and distributed radially in the central plane between the interacting bodies. The flow structure depends on the shape of the bodies, their geometrical arrangement and the Reynolds number given by the rotational speed. The observed flow structures gave rise to further investigations with PIV-measurcments and numerical simulations.

关键词： Rotating fluids pattern formation recirculation zones interacting bodies flow visualization

Analytical evaluation of the plasma dispersion function for a Fermi-Dirac distribution

在线全文

学校读者我要写书评

暂无评论

Chinese Physics b 2012年第5期21卷 400-404页

作者： b.A.Mamedov Department of Physics Faculty of Arts and SciencesGaziosmanpa sa University

An efficient method for the analytic evaluation of the plasma dispersion function for the Fermi-Dirac distribution is *** new method has been developed using the binomial expansion theorem and the Gamma *** general formulas obtained for the plasma dispersion function are utilized for the evaluation of the response *** resulting series present better convergence *** acceleration techniques are combined to further improve the *** obtained results for the plasma dispersion function are in good agreement with the known numerical data.

关键词： Fermi Dirac distribution plasma dispersion function binomial coefficients incompletegamma functions