Riemannian geometry of strong-laser plasma

The optical metric for a strong-laser plasma is derived. The affine connection and curvature related to the optical metric are given and their spatial distributions are studied numerically.     

Effect of Water Fraction on Rheological Properties of Waxy Crude Oil Emulsions

This article discusses the effect of water fraction on the rheological properties of waxy crude oil emulsions including gel point, yield stress, viscosity, and thixotropy. The experimental results reveal that the rheological behaviors of the w/o emulsion samples all intensify with the increase of water volume fraction within 60%. Of more significance is that a correlation for w/o emulsions between yield stress and water volume fraction is put forward with an average relative error of 6.75%. In addition, some mainstream viscosity prediction models of w/o emulsions are evaluated, and Elgibaly model is the best-fit for the emulsions in this study.     

光纤复合型油气井下压力温度测量系统

针对目前广泛使用的电子式油气井下压力温度测量系统可靠性低、高温环境漂移大的不足,设计了一种基于非本征型F-P干涉仪(EFPI)和光纤布喇格光栅(FBG)的复合型油气井下压力、温度测量系统,详细说明了其工作原理、传感器组成和信号解调方法,初步试验结果表明,该测量系统不仅克服了电子测量方式的不足,而且具有复用性好、测量精度高等优点.     

Phase diagram of the V2O5-MoO3-Ag2O system

The phase diagram of the MoO₃-Ag₂O system was constructed. A comparison of the phase diagram presented here with the phase diagram of MoO₃-Ag₂MoO₄ system presented in [2] revealed some discrepancies.It was found that phase equilibrium in MoO₃-Ag₂O system could be reached only after cooling the previously melted mixtures of silver and molybdenum oxides.

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Zusammenfassung Es wurde das Phasendiagramm des Systemes MoO₃-Ag₂O erstellt. Der Vergleich dieses Phasendiagrammes mit dem des in (2) beschriebenen Systemes MoO₃-Ag₂MoO₄, ergeben sich einige Unterschiede.Man fand, da\ ein Phasengleichgewicht im System MoO₃-Ag₂O nur nach Abkühlen des zuvor geschmolzenen Gemisches aus Silber- und MolybdÄnoxides erreicht werden kann.

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The author wishes to thank Professor M. Figlarz from Université de Picardie, Amiens for giving the possibility of carrying out in his laboratory a part of the experiments described.     

IMPERFECTION SENSITIVITY ANALYSIS OF A RECTANGULAR COLUMN COMPRESSED INTO THE PLASTIC RANGE

I.IntroductionSinceelasticunloadingoccursinthedeformationprocess,theimperfectionsensitivityanalysisofstructuresloadedintotheplasticrangeismuchcomplicated.TheproblemisfirststudiedintheorybyHutchinson(1973,1974)l"ZI.HeusedKoiter'stheorytoanalysethebehaviorpriortotheonsetofelasticunloadingandtoobtaintheloadandthedisplacementatwhichelasticunloadingbegins.NeedlemanandTvergaard(1982)l'jpresentedananalysisofimperfeCtionsensitivityintheplasticrangethatignoreselasticunloading,thatis,substituteshypo-…     

LabVIEW下CASSY软件的实现

主要介绍了如何在LabVIEW平面下直接与CASSY实验系统的连接。给出了用LabVIEW软件实现细节。同时介绍了利用CASSY实验系统基于串口的高频信号采集的方法。     

Phase diagram of V2O5-MoO3-Ag2O

Phase equilibria in the V₂O₅-Ag₂O system were investigated at a constant pressure of oxygen (0.2 atm) and the phase diagram found under these conditions was compared with the results of the authors who investigated the same system in vacuum and at an oxygen pressure of 1 atm. On the basis of all these results, an attempt was made to construct the hypothetical diagram of V₂O₅-Ag₂O-O₂.     

Visual exploration of dependency graph in source code via embedding-based similarity

Journal of Visualization -  A large software system contains millions of lines of source code, and the development often involves many developers over a long period. How to understand and...     

Tuning the Mechanical Properties of Poly(Ethylene Glycol) Microgel‐Based Scaffolds to Increase 3D Schwann Cell Proliferation

2D in vitro studies have demonstrated that Schwann cells prefer scaffolds with mechanical modulus approximately 10× higher than the modulus preferred by nerves, limiting the ability of many scaffolds to promote both neuron extension and Schwann cell proliferation. Therefore, the goals of this work are to develop and characterize microgel‐based scaffolds that are tuned over the stiffness range relevant to neural tissue engineering and investigate Schwann cell morphology, viability, and proliferation within 3D scaffolds. Using thiol‐ene reaction, microgels with surface thiols are produced and crosslinked into hydrogels using a multiarm vinylsulfone (VS). By varying the concentration of VS, scaffold stiffness ranges from 0.13 to 0.76 kPa. Cell morphology in all groups demonstrates that cells are able to spread and interact with the scaffold through day 5. Although the viability in all groups is high, proliferation of Schwann cells within the scaffold of G* = 0.53 kPa is significantly higher than other groups. This result is ≈5× lower than previously reported optimal stiffnesses on 2D surfaces, demonstrating the need for correlation of 3D cell response to mechanical modulus. As proliferation is the first step in Schwann cell integration into peripheral nerve conduits, these scaffolds demonstrate that the stiffness is a critical parameter to optimizing the regenerative process.

     

选通式象增强器的新型导电基底

本文介绍了采用光刻技术制备的一种新型的导电基底,它的面电阻≤ 10Ω,透过率约为 89%.在该基底上研制出的选通式象增强器,可实现选通时间在 ns级以上的高速选通,适用于微光、瞬时多通道高速光谱分析系统和高速摄影系统.