检索结果-南通市图书馆

Sequential storage and release of microdroplets

在线全文

学校读者我要写书评

暂无评论

Microsystems & Nanoengineering 2021年第5期7卷 151-160页

作者： Zenon Toprakciogl Tuomas p.j.Knowles Centre for Misfolding Diseases Yusuf Hamied Department of ChemistryUniversity of CambridgeLensfield RoadCambridge CB21EWUK Cavendish Laboratory Department of PhysicsUniversity of CambridgeJ J Thomson AvenueCambridge CB3 OHEUK

Droplet microfluidic methods have opened up the possibility of studying a plethora of phenomena ranging from biological to physical or chemical processes at ultra low volumes and high throughput.A key component of such approaches is the ability to trap droplets for observation,and many device architectures for achieving this objective have been developed.A challenge with such approaches is,however,recovering the droplets following their confinement for applications involving further ***,we present a device capable of generating,confining and releasing microdroplets in a sequential *** a combination of experimental and computational simulations,we shed light on the key features required for successful droplet storage and ***,we explore the effect of the flow rate of the continuous phase on droplet release,determining that a critical rate is needed to ensure complete droplet deformation through constrictions holding the droplets in place prior to ***,we find that once released,droplets can be retrieved and collected off *** ability to generate,store and sequentially release droplets renders such a device particularly promising for future applications where reactions may not only be monitored on-chip,but droplets can also be retrieved for further analysis,facilitating new exploratory avenues in the fields of analytical chemistry and biology.

关键词： deformation release render

Recent developments in high-pressure die-cast magnesium alloys for automotive and future applications

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

journal of Magnesium and Alloys 2023年第1期11卷 78-87页

作者： Gerry Gang Wang j.p.Weiler Meridian Lightweight Technologies StrathroyOntario N7G 4H6Canada

The use of magnesium alloy high pressure die cast(HpDC)components for structural applications,especially in the automotive and transportation industries,where weight reduction is of a great concern,is *** new applications are developing and existing applications are becoming more complex,there is a need for improved properties from magnesium HpDC *** paper reviews the recent developments in HpDC magnesium alloys for transportation *** to the conventional HpDC magnesium alloys,***91D,AM50A/AM60B and AE44,these new alloys have one or more of the following properties:higher strength,higher ductility,superior high-temperature properties or higher thermal *** this work,characteristics which are important in product manufacturing or product performance will be evaluated and discussed,including die castability of powertrain component or thin-walled structural component,mechanical properties at elevated temperatures and *** indicate that these alloys have great potentials to be added to the current magnesium HpDC alloy family and being used in actual automotive and other transport applications.

关键词： alloys alloy ductility

Structural and photoluminescence studies of Eu^(3+) doped zinc oxide nanorods prepared by precipitation method

在线全文

学校读者我要写书评

暂无评论

journal of Rare Earths 2013年第1期31卷 37-43页

作者： partha p.pal j.Manam Department of Applied physics Indian School of Mines

Abstract： Trivalent europium doped zinc oxide （ZnO：Eu3＋） nanocrystals were synthesized via room temperature chemical co-pre- cipitation and they were systematically characterized by means of X-ray diffraction （XRD）, Fourier transform infrared spectroscopy （FTIR） and photoluminescence （pL） spectroscopy. The as-synthesized samples were found to have hexagonal wurtzite coexisted with the intermediate Zn5（OH）sC12·H2O phase, while the single hexagonal phase was facilitated due to the calcinations. The as obtained samples were broadly composed ofnanoflakes while the highly crystalline nanorods were formed due to low temperature annealing of the as-synthesized samples. The crystallite size of the nanoflakes and nanorods （40-90 nm） were extracted from the XRD pattern which was found to be consistent with scanning electron microscopy （SEM） measurements. The photoluminescence （pL） spectra of nanophosphors showed bright red and orange emissions at 618 and 594 nm respectively with efficient broad blue green emis- sion spectrum due to ZnO lattice. Further, a good energy transfer process from ZnO host to Eu3＋ was observed in pL emission and excitation spectra of Eu3＋ doped ZnO ions. In all, the present nanophosphors were found to have great potentiality for bio-appli- cations.

关键词： photoluminescence zinc oxide rare earth europium nanorods nanoflakes

Multi-relaxation-time lattice Boltzmann simulations of lid driven flows using graphics processing unit

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2017年第5期38卷 707-722页

作者： Chenggong LI j.p.Y.MAA National Engineering Laboratory for Methanol to Olefins Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of Sciences College of William and Mary Virginia Institute of Marine Science

Large eddy simulation （LES） using the Smagorinsky eddy viscosity model is added to the two-dimensional nine velocity components （D2Q9） lattice Boltzmann equation （LBE） with multi-relaxation-time （MRT） to simulate incompressible turbulent cavity flows with the Reynolds numbers up to 1 × 10^7. To improve the computation efficiency of LBM on the numerical simulations of turbulent flows, the massively parallel computing power from a graphic processing unit （GpU） with a computing unified device architecture （CUDA） is introduced into the MRT-LBE-LES model. The model performs well, compared with the results from others, with an increase of 76 times in computation efficiency. It appears that the higher the Reynolds numbers is, the smaller the Smagorinsky constant should be, if the lattice number is fixed. Also, for a selected high Reynolds number and a selected proper Smagorinsky constant, there is a minimum requirement for the lattice number so that the Smagorinsky eddy viscosity will not be excessively large.

关键词： large eddy simulation (LES) multi-relaxation-time (MRT) lattice Boltzmann equation (LBE) two-dimensional nine velocity components (D2Q9) Smagorinskymodel graphic processing unit (GpU) computing unified device architecture (CUDA)

Comparative analysis of entanglement measures based on monogamy inequality

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2017年第5期26卷 52-59页

作者： p j Geetha Sudha K S Mallesh Department of physics Kuvempu University Shankaraghatta Shimoga-577 451 India Inspire Institute Inc. Alexandria Virginia 22303 USA Department of Studies in physics University of Mysore Mysore-570 006 India

We evaluate the monogamy inequality for symmetric, non-symmetric pure states of importance in terms of squared concurrence, squared entanglement of formation, squared negativity of partial transpose and compare the corresponding tangles. We show that though concurrence and concurrence tangle are zero for two special classes of mixed entangled states, both negativity tangle and entanglement of formation（EOF） tangle turn out to be non-zero. A comparison of different tangles is carried out in each case and it is shown that while the concurrence tangle captures the genuine multiqubit entanglement in N-qubit pure states with N distinct spinors（containing GHZ and superposition of W-, obverse W states）either negativity tangle or EOF tangle is to be used as a better measure of entanglement in the W-class of states with two distinct spinors and in the special classes of mixed multiqubit states.

关键词： entanglement tangle negativity superposition inequality entangled symmetric vanishing squared arbitrary

Space Traffic Coordination: Developing a Framework for Safety and Security in Satellite Operations

在线全文

学校读者我要写书评

暂无评论

Space(Science & Technology) 2021年第1期2021卷 220-229页

作者： p.j.Blount University of Luxembourg Luxembourg

This article investigates the extant normative framework that can be identified around the concept of space traffic management(STM).While much of the STM literature engages with how a future regime might be structured,this article attempts to engage with current processes related to space traffic coordination and give insight as to how normative growth toward space traffic management might *** a survey of current legal and governance mechanisms,this article focuses its attention on open data sharing as an extant and critical coordination process that has potential for normative growth in the development of space traffic management as a formal regime.

关键词： regime coordination legal

Combinatorial therapies for spinal cord injury repair

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

Neural Regeneration Research 2025年第5期20卷 1293-1308页

作者： Carla S.Sousa Andreia Monteiro António j.Salgado Nuno A.Silva Life and Health Sciences Research Institute(ICVS) School of MedicineUniversity of MinhoCampus de Gualtar-gualtarBragaPortugal ICVS/3B’s Associate Lab PT Government Associated LabCampus de Gualtar-gualtarBragaPortugal

Spinal cord injuries have profound detrimental effects on individuals, regardless of whether they are caused by trauma or non-traumatic events. The compromised regeneration of the spinal cord is primarily attributed to damaged neurons, inhibitory molecules, dysfunctional immune response, and glial scarring. Unfortunately, currently, there are no effective treatments available that can fully repair the spinal cord and improve functional outcomes. Nevertheless, numerous pre-clinical approaches have been studied for spinal cord injury recovery, including using biomaterials, cells, drugs, or technological-based strategies. Combinatorial treatments, which target various aspects of spinal cord injury pathophysiology, have been extensively tested in the last decade. These approaches aim to synergistically enhance repair processes by addressing various obstacles faced during spinal cord regeneration. Thus, this review intends to provide scientists and clinicians with an overview of pre-clinical combinatorial approaches that have been developed toward the solution of spinal cord regeneration as well as update the current knowledge about spinal cord injury pathophysiology with an emphasis on the current clinical management.

关键词： electric stimulation neural tissue regeneration neuroprotection polytherapy spinal cord injury

A linear regression model (LRM) for groundwater chemistry in and around the Vaniyambadi industrial area, Tamil Nadu, India

在线全文

学校读者我要写书评

暂无评论

Chinese journal Of Geochemistry 2013年第1期32卷 19-26页

作者： Sajil Kumar p.j. Davis Delson p. Vernon j.G. james E.j. Brandenburg Technical University Cottbus-03046 Germany ITALCONSULT Riyadh-11421 Saudi Arabia Budapest University of Technology and Economics (BME) Budapest-Pf. 91 H-152 Hungary Water Institute Karunya UniversityCoimbatore-641114 India

A linear regression model in conjunction with cluster analysis was applied to the groundwater quality parameters for the Vaniyambadi industrial area, Tamil Nadu, India. These physico-chemical parameters were collected from 25 wells by intensive groundwater sampling conducted during january 2010. All the major ions, pH and electrical conductivity were analyzed. The abundances of cations were in the order of Na pectively. This was in agreement with the water types, Na-Cl and Na-Ca-HCO3, determined by the piper plot. High concentrations of the ions Na, Cl and SO4 were recorded near the tanneries that operate within the study area. While the elevated concentrations of HCO3 and F were observed away from the tanneries. This peculiar hydrochemical behaviour suggests that the chemistry of water is predominantly influenced by tannery effluents and weathering of silicate minerals. Results of the linear regression model yielded 11 regression equations for the 5 most correlated parameters. A dendrogram from the cluster analysis showed 2 major clusters representing the influence of tanneries and geological formations in the study area, which confirmed the results of major ion chemistry.

关键词：线性回归模型地下水化学工业区印度 LRM 聚类分析物理化学参数研究区域

Microstructure and brazing mechanism of porous Si_3N_4/Invar joint brazed with Ag-Cu-Ti/Cu/Ag-Cu multi-layered filler

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4期34卷 713-719页

作者： j.Zhang j.Y.Liu T.p.Wang School of Materials Science and Engineering Harbin Institute of Technology

porous Si3N4 was brazed to Invar alloy in this study, and Ag-Cu-Ti/Cu/Ag-Cu multi-layered filler was designed to inhibit the formation of Fe2Ti and Ni3Ti intermetallic compounds. The effects of the brazing temperature and the thickness of Cu interlayer on the microstructure and mechanical properties of brazed joints were investigated. The typical microstructure of the joint brazed with multi-layered filler was porous Si3N4/TiN ＋ Ti5Si3/Ag-Cu eutectic[Cu[Ag-Cu eutectic/Cu-rich layer ＋ diffusion layer/Invar. When the brazing temperature increased, the reaction layer at the ceramic/filler interface grew thicker and the Cu interlayer turned thinner. As the thickness of Cu interlayer increased from 50 to 150 μm, the joint strength first increased and then decreased. In this research, the maximum shear strength （73 Mpa） was obtained when being brazed at 1173 K with a 100 μm Cu interlayer applied in the filler, which was 55% higher than that brazed with single Ag-Cu-Ti brazing alloy and had reached 86% of the ceramic. The release of residual stress and the barrier effect of Cu interlayer to inhibit the formation of Fe2Ti and Ni3Ti intermetallics played the major role in the improvement of joint strength.

关键词： porous Si3N4 Invar alloy Brazing Microstructure Mechanical properties