剪下

The result s indicate that there are synergy effect s between pile and foam under flatwise compressive st rength and fabric piles f ractured under flatwise compression. The flatwise compressive and shear st rength decrease with increasing of the pile height . The flatwise compressive st rength increases as exponent with increasing of the foam density.

结果表明，三维间隔连体织物泡沫夹层结构复合材料承受平压载荷时，芯柱和泡沫存在协同效应；平压载荷作用下主要发生芯柱断裂破坏；随着芯柱高度增加，平压、剪切强度均减小；随着泡沫密度增加，平压强度近似呈指数增长。

To research the nano-scale thin film lubrication which consists widely in micro electro mechanical systems and precision instruments,firstly,an interaction model of long chain molecules hexadecane ,used as lubrication,was built.

针对广泛存在于微机电系统和精密机械中的纳米薄膜润滑问题，首先建立了作为润滑剂的正十六烷长链分子间的作用力模型；接着运用分子动力学模拟的方法得到了润滑剂在6种不同的剪切速率下的应力、速度和温度分布；研究了摩擦过程中特殊的物理现象。

Through metallographic analyses, the failure is found to be dimple intercrystalline fracture under high strain-rate loading.

基于试样金相和断口分析，30CrMnSiNi2A钢在高应变率冲击加载条件下产生了韧窝型沿晶断裂，导致材料宏观上表现为剪切破坏。

The analytical expression of axie displacement, axie stress and interlaminar shear stress were given under some simple loading forms.

给出了一些简单载荷作用下的轴向位移、应力及层间剪切应力的解析表达式。

The seismic behaviors of dykes with saturated liquefiable soil foundation are studied by dynamic centrifuge model test and numerical simulation.

基于动态土工离心机试验和多重剪切机构模型的有效应力分析方法，研究了不同地震强度下，液化场地堤坝的地震响应和大变形特征。

The seismic behaviors of dykes with saturated liquefiable soil foundation are studied by dynamic centrifuge model test and numerical simulation.

中文摘要：基于动态土工离心机试验和多重剪切机构模型的有效应力分析方法，研究了不同地震强度下，液化场地堤坝的地震响应和大变形特征。

Through designing of composition and structure of the bioactive graded coating,innerstress and its distribution in the coating were analyzed and calculated, the resultsshowed that when composition distribution coefficient n was 1.5, a reasonable stressdistribution could be got, that was at the beginning of deposition the suspension containingrichly BG granules was used so that a rich BG granules layer, a good transitional layerbetween BG layer at the bottom and the coating could be obtained at the titanium alloy side,the bottom of the coating; the stress value near the interface and surface and its character,pressure stress or tensile stress, were decided by the character of its composition itself.Changing composition distribution coefficient n could only change the variation tendency ofstress in the coating, but did not change the stress distribution rule in the coating. Thethinner the coating is, the sharper stress variation in the coating is, which does not mean thatthicker coating is better because the thicker the coating is, the little the permitteddeformation of coating is, so the coating thickness should be thinner, for example, about50μm for bending applications, but for applications only bearing pure shear stress, such asroot of tooth implant, the coating can be thicker little, for instance, about 80～100μm. The study on electrification characteristic and electrophoresis deposition of HAand BG granules in aqueous and non-aqueous solution system found that EPD almost didn'toccur in aqueous solution system. However, because HA granules take position charges inabsolute alcohol, a homogeneous EPD be carried out on the cathode titanium alloy slice, but taking negative charge in absolute alcohol the BG granules not be deposited on the cathode. A guided HA crystallizing, 100～300nm, on surface of the BG granules be realized by metathetical reaction, which cover BG granules with HA microcrystals and make the covered BG granules taking position charges in absolute alcohol, sequentially realize the EPCD of the BG and HA granules on the cathode, so it is feasible to make a titanium alloy/BG/HA bioactive graded coating by making use of EPCD technology. The corrosion experiment of rich boron bioglass coating and plasma spray coating showed that split phase, rich boron and rich silicon phase, occurred during its preparation. In basic medium the corrosion behavior of 〓 BG coating showed uniformity corrosion, the corrosion mostly occurred at rich boron phase area, therefore batch formula design of BGshould avoid the occurring of split phase. The corrosion appearance of plasma spray coatingappeared a non-uniform corrosion, mostly occurred at the edge of the laminated HA moltendrops, and emerged an accelerated corrosion tendency, which will easyly lead to corrosioncrackles extending to the interface and the happening of osmotic interfacial corrosion, thatmay be one of the major reasons leading to the coating cracking-off in the later period. Thetesting results of thermal expansion coefficient of 〓 and 〓BG showed the thermalexpansion coefficient of 〓 BG matched with that of titanium alloy better, and 〓 BG couldsinter with titanium alloy into densification enamel layer at low temperature (720℃).

将Ti6Al4V合金在1000℃下进行真空热处理会降低其力学性能，且合金内的V元素会向表面富集，因此，钛合金真空热处理和表面涂层的烧结温度不能过高，即应低于其相转变点；通过对生物活性梯度涂层的组成和结构的设计，分析和计算了梯度涂层内的应力大小和分布，结果表明：对于本研究，当成分分布系数n=1.5时，可以获得较合理的涂层力学性能，即在沉积开始时，采用富含BG颗粒的悬浮液，以便在钛合金侧获得同底层BG有良好过渡的富BG涂层；梯度涂层界面和表面的应力大小、性质由材料组成本身的性质决定，改变成分分布系数，只能改变涂层内应力变化的趋势；涂层的厚薄不影响涂层内的应力分布规律，但涂层越薄，涂层内的应力变化越快，但这并不意味着涂层越厚越好，因为涂层越厚，涂层允许的变形越小，对于应用于弯曲受力部位的涂层而言，涂层应薄一点为好(50μm)；而对于仅纯受剪切应力的部位，如牙根种植体，涂层可适当加厚(80～100μm)；通过对HA和BG颗粒在水溶液体系和非水溶液体系中的带电特性和电泳沉积的研究发现，它们在水溶液体系中很难发生电沉积；在无水乙醇溶液中，HA颗粒带正电，可在阴极钛合金片上发生均匀的电泳沉积，而BG颗粒则带负电荷；利用复分解反应法，可以制得100～300nm的HA，通过诱导HA在BG颗粒表面结晶，可对BG颗粒进行表面包覆，获得了被HA包覆的BG颗粒，改变了BG颗粒表面的带电特性，使BG和HA颗粒在无水乙醇中均带上正电荷，从而实现了HA和BG颗粒在阴极上的共沉积。

METHODS: Rat cerebral cortex was obtained sterilely, made into monoplast suspension by the mechanical separation, and then incubated in the serum-free MEM/F12 medium, supplemented with B27 neurotrophic additive for 1 week. Subsequently, cells were passaged.

无菌条件下取胎鼠大脑皮质，剪碎后机械分离法制作单细胞悬液，加入含B27神经营养添加剂的无血清MEM/F12培养基进行培养，1周后传代。

The results showed that the orientations of the initiation and propagation for fatigue crack were mainly in the two maximum shear planes, and affected by the nonproportional degree under multiaxial proportional and nonproportional loading.

结果表明，多轴比例与非比例加载下，疲劳裂纹萌生的位向及扩展方向主要在两个最大剪切平面上，且受非比例加载程度的影响。

However, relating to investigate the modes, courses and characteristics of the orogenetic process in Paleozoic and after orogenetic process, the cognitive divergence have still occurred.

通过对新疆北东部地区不同构造区带构造作用的方式、过程和特点的研究，确定：①南天山榆树沟高压麻粒岩地体的正变质原岩是一个基本完整的蛇绿岩套，其经历了俯冲至下地壳的高压麻粒岩相、构造抬升至深地壳麻粒岩相以及快速构造折返至角闪岩相的变质过程，代表了南天山洋壳俯冲、变质、随后折返的过程，并首次确定了变质过程的PTt轨迹；②奥陶纪末期中天山北缘发生洋盆俯冲、地体增生作用，此时萨日达拉地区处于岛弧活动带；中石炭世晚期中天山小型洋盆关闭，准噶尔地块与伊犁—中天山板块斜向对接随后发生脆韧性质近水平高温低速右行走滑剪切；③根据巴音沟地区不构成蛇绿岩套有效成分的硅质岩具有与活动大陆边缘密切相关的地球化学特征以及洋中脊玄武岩显示其岩浆源区受到消减带流体交代作用的影响，结合区域地质资料，首次提出巴音沟蛇绿岩带所代表的洋盆古构造环境为弧后盆地，并于早石炭世至中石炭世末期间，经历了扩张、收缩和闭合过程；④首次在克拉麦里蛇绿混杂岩带中分解出具有N-MORB、T-MORB与OIB三种不同类型的火山岩岩石组合，反映了洋盆俯冲

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。