Materials Literature
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摘要： 芯片表面贴装过程中需要通过点胶工艺将微量胶液定量配发到基板上的指定位置，该过程对胶液配发量的一致性有很高的要求。针对现有对接触式微量点胶过程研究中普遍将胶液挤出量视为实际转移量的问题，通过对针头处胶液与基板接触拉断过程动力学行为分析，建立多参数下胶液转移过程动力学模型；并建立胶滴在基板上稳态后的形状理论模型，用以验证体积函数模型(Volume of fluid，VOF)对气液两相流界面追踪的有效性。在此基础上，结合VOF模型、Brackbill表面张力模型及动网格法对胶液接触拉断过程动态行为进行数值模拟，获得了不同接触距离、胶液拉断速度、胶液与基板间的接触角对胶液转移量的影响规律。结果表明，胶液拉断后针头上会有少量胶液残留…
多晶的庞大的 magnetoresistive 双 layered 水锰矿样品 R1.2Sr1.8Mn2O7 (R = La， Pr， Nd， Sm ) 被 solgel 方法准备，他们的房间温度橡皮行为被超声的脉搏传播技术在 1 MHz 调查。有弹性的常数的价值被计算从纵并且砍速度和他们用 Hasselman 和 Fulraths 公式被改正到零个孔。样品的有弹性的常数被基于在样品在场的金属离子的 Modis 异构的金属混合统治也估计。测量，改正，并且估计有弹性的 moduli 的价值被发现与减少增加稀土元素离子尺寸。有稀土元素离子的尺寸的有弹性的 moduli 的变化以 interatomic 结合的力量被解释。
Due to the discomfort sensation of human skin in previous friction experiments is difficult to evaluate quantitatively, the human skin tribological tests are carried out on an UMT-II multi-specimen test system in present study. The volunteers' physiological signals(skin temperature, conductance and electroencephalogra…
In this paper, different electrical measurement and operation methods of resistive random access memory(RRAM) have been summarized, including voltage sweeping mode(VSM), current sweeping mode(CSM), constant current stress(CCS), constant voltage stress(CVS), rectangular pulse mode(RPM), and triangle pulse mode(TPM). Me…
Fermentation residue of corn stover was liquefied in polyhydric alcohols in the presence of sulfuric acid as the catalyst at the temperature from 140 to 180 ℃. The liquefied product was used as polyol component for the preparation of rigid polyurethane foam. The results indicated that the highest yield of liquefaction…
1 Introduction Calcium sulfate deposition is one of the most important and serious problems faced by heat transfer equipment during operation(Pavlos et al.,1999;Liu et al.,1996).The crystallization of calcium sulfate is known as a major
Bubble dynamics are associated with wide and important applications in cavitation erosion in many industrial systems, medical ultrasonics and underwater explosions. Two recent developments to this classical problem are reviewed in this paper. Firstly, computational studies on the problem have commonly been based on an…
Al2O3- SiC- C specimens were prepared using white fused corundum( 3- 1,≤1 and ≤0. 044 mm),Al2O3- SiC composite powders( d50≤5 μm),α-Al2O3micropowder( d50= 1. 2 μm),SiC powder( ≤0. 044mm),flake graphite( ≤0. 088 mm),Si powder( d50= 42. 8 μm) and B4C powder( d50≤10 μm) as main starting materials,and thermosetting phenol…
nano-TiO2 粒子被液体水解作用方法准备并且描绘了使用 XRD。它对二个代表的抗菌剂活动细菌， Escherichia coli 和葡萄球菌 aureus，也被学习。试验性的结果出现了在 600700 瑵椠 ? 楶牴 ? 整瑳 ? 湡 ? 敲慰物 ? 的 nano-TiO2 calcinated ??? 業散挠污慶楲污搠晥 ' 太 B. 吗？？
The 1.3 mm thick plate of ODS high temperature alloy MGH956 was TIG welded with fillers containing different B4 C(0, 0.25 and 0.5 mass %), then the effect of B4 C content on the microstructure and mechanical properties of the weld joints was investigated. The results show that the microstructure of the weld metal with…
The NiCr/Cr3C2-10%WS2、NiCr/Cr3C2-20%WS2and NiCr/Cr3C2-30%WS2are used as alloy powders preplaced on the Ti6Al4V,then theγ-NiCrAlTi/TiC+TiWC2/CrS+Ti2CS self-lubrication wear resistant composite coatings were fabricated by laser cladding technology.The constituents and microstructure of the fabricated coatings were exami…
An efficient method for purification of Yard-Glass Shaped Boron Nitride NanoTubes (YG-BNNTs) fabricated via a Chemical Vapour Reaction (CVR) route has been developed. Impurities including carbon, Boron Nitride (BN), and Fe species in the pristine YG-BNNT sample are removed by a combined physical and chemical procedure…
Lanthanide-doped luminescent inorganic materials are widely used for solid-state lasers,optical communications,flat displays,bioprobes,and nanophotonics.Lanthanide ions(from Ce to Yb) are excellent structural and spectroscopic probes,and their optical properties in diverse host materials are critically dependent on th…
The study of controlled rolling/controlled cooling process parameters which affect the microstructure and mechanical properties of a novel pipeline steel has been optimized by the orthogonal experiment with four factors and three levels in this paper.However,the parameters of thermo-mechanical control process(TMCP)opt…
在火花血浆 sintering (SPS ) 的协作多地效果下面包含微小的氧化物粒子的基于 Fe 的合金粉末的 densification 机制被调查。Metallographic 显微镜学和扫描电子显微镜学被用来在 sintering 期间在一个单个球形的粉末粒子在不同温度，和温度分发观察样品 sintered 的形态学在血浆的影响的考虑被计算，它通过 U-I 曲线的分析合格、确定。血浆被观察在在 sintering 的早阶段激活并且加热样品起一个实质的作用，而焦耳热效果在 sintering 期间起了一个主导的作用。而且，血浆也为颈形成便于材料的散开和迁居。
Corrosion behavior of Cu,P,Cr and Ni alloyed low carbon steels and plain carbon steels was examined by means of cyclic immersion corrosion test,electrochemical impedance spectroscopy and polarization curve measurements with 1%(mass fraction) NaHSO3solution.Corrosion resistance of Cu- P- Cr- Ni low carbon steels and Q2…
Acetone( CH3COCH3) /NaOH,ethanol( EtOH) /NaOH and other chemical reagents systems were used for pre-treating cellulose. The R-10 value and water retention value( VWR) were measured to evaluate their impacts on polymerization degree and accessibility of cellulose. The cellulose pretreated under the optimal condition wa…
这份报纸在绝缘体上在硅调查慢轻的繁殖宽槽 photonic 水晶波导(PCW ) 。二个设计计划被介绍，分别地依靠洞格子和槽的分散工程。模式模式和乐队图被 3D 飞机波浪扩大方法计算。然后，联合并且慢轻的繁殖在完整的 Mach-Zehnder 干涉仪(MZI ) 用有限差别时间领域方法被建模。结果显示出高振幅干扰穗和高联合效率。设备的制造和测量超过 50 与组索引导致慢轻的繁殖，当在也观察的乐队边附近的多重散布和局部性的模式时。这研究提供卓见因为在空核心槽的损失高组织索引波导。
这研究首先在实际的钢脱衣的表面上调查了裂缝。在 ANSYS 软件提出 Anand 模型，我们然后在成双转动的扔进程期间在类型 304 不锈钢的熔融的水池模仿了压力领域。在熔融的水池影响压力分发的参数详细被分析并且优化。在成双转动的扔以后，很多 transgranular 和 intergranular 裂缝在薄钢长带的表面上住了，并且跟随了一条曲折路径。在熔融的水池，应力在出口并且在压路机接触位置被提高。在出口的压力与增加扔速度和流的温度减少了。为了保证制作脱衣，扔的速度和流的温度的高质量，应该在钛 io 的 0.7 m/s 和 1520tion 上面被控制吗？
A commercial product of carbon nano-particles,Cabot MONACH 1300 pigment black（CMPB）,was studied for basic structural information and electrochemical performance in neutral aqueous electrolytes,aiming at applications in supercapacitors.As confirmed by SEM and HRTEM,the CMPB had a hierarchical structure,containing basic…