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The microstructure, strength-toughness and fatigue properties of an ultrahigh strength steel 40CrMnSiMoVA have been investigated. The so-called eta-bainite,composed of thin rareined austenite films within or between the bainitic ferrite laths was found in the steel after isothermally quenched at 300℃ for 1h.

本文研究了飞机起落架用超高强度40CrMnSiMoVA钢的显微组织、强韧性和疲劳性能,结果表明,该钢经300℃等温1h淬火可获得由贝氏铁素板条与条间或条内的残余奥氏薄膜所组成的准贝民组织。

Liposome properties and biological behaviors can be controlled by surface modification. Attachments of hydrophilic polymers, such as poly, enable them to have a prolonged circulation time without being opsonized and recognized by mononuclear phagocytic system.

通过表面修饰可以改变脂质的性质和生物学行为:在脂质表面修饰亲水性高分子可以阻碍血浆成分的调理作用,减少脂质被网状内皮系统识别和摄取,使脂质具有长循环的特点;在脂质表面修饰特异性的配基,能使脂质具有主动靶向的特性。

Almost all CF was released from Dansyl-PE by CTX-IX that osmosed the Dansyl-PE liposome like detergent; CF releases from PE or PS liposome induced by CTX-IX were related with both of CTX-IX and phospholipid concentrations, this indicated that the phase seperation should be a reasonable mechanism for CF permeability of PS or PE liposome in the presence of CTX-IX rather than CTX-IX channel formation on the membrane. CTX-IX influence of CF release of PC liposome was very slight. CF release from Dansyl-PE、PE or PE liposome in response to CTX-IX could be inhibited by Ca〓.

CTX-IX对靶脂如此种种强烈的作用,使得它引起含Dansyl-PE脂质CF的泄漏犹如击污剂那样强烈;引起含PS或PE脂质CF渗透的增加为一个与CTX-IX及磷脂浓度有关的二级反应过程,这种动力学特征提示渗透性增加的机制可能是CTX-IX在脂膜上产生的脂质分子相分离,而不是CTX-IX脂膜上形成通道;CTX-IX对PC脂质渗透性几乎没有影响,而对上述脂质渗透性增加作用均可被Ca〓所抑制。

Firstly, the basic theory of three-dimensional automatic identification method and elastic-viscoplastic Block Element Method for rock masses, in which the deformations of block elements are not taken into account, are introduced, as well as their application to the stability analysis of Xiaowan high arch dam abutment and rock foundation.

首先,介绍了三维岩石块系统的自动识别方法和不考虑块单元本身变形的三维弹粘塑性块单元法基本理论,及其在小湾高拱坝坝肩和坝基岩稳定分析中的应用结果。

Times higher than that of initial strain. Polysaccharides, such as barley flour, dextrin and soluble starch, were better carbon sources than monosaccharides and disaccharides, such as glucose and maltose, for cell growth of B subtilis ZJF-1A5 and β-glucanase production. Yeast extract was the best nitrogen source, the following was soybean flour.

糊精、大麦粉等多糖有利于B.subtilisZJF-1A5 β-葡聚糖酶的产生,葡萄糖、蔗糖等易利用性碳源不利于菌生物量的积累和β-葡聚糖酶的产生,β-葡聚糖酶受分解代谢产物阻遏调节。B.subtilis ZJF-1A5 β-1,3-1,4-葡聚糖酶的产生与菌生物量和菌生长状态密切相关,提高发酵产酶水平的关键是提高菌生物量和解除葡萄糖效应。

According to the characteristics of huge underground openings and the layered rock mass, the author finds that the rock mass of side wall along the dip direction is easy to slide along bed plane and the rock mass of side wall athwart the dip direction is easy to bend. The possible geological problems of excavating underground openings in layered rock mass are analyzed, some corresponding countermeasures are also put forward.

结合巨型地下洞室群工程及陡倾角层状岩的特点,通过分析得出陡倾角层状岩中大型地下洞室顺倾向侧高边墙岩易于顺层滑动、反倾向侧高边墙岩易于倾倒弯折变形破坏的特点,并提出了围岩稳定可能面临的工程地质问题,以及可供采用的对策技术。

The results show that the microscopical pore structure of the three dimensional orthogonal woven carbon fabric structure perform is composed of body-centered cubes which arranged periodically at spaces. The net structure and shape of the pores of perform are determined by the size and proration of the fasciculus diameter, which are key factors influencing the gaseous permeability and final density of composites. Once the proration of the fasciculus diameters of different directions is determined, the trend of diversification of the permeability followed by pore rate during CVI process and the density of composites are stated, and the permeability increases with the increase of the fasciculus diameter.

研究结果表明:三维正交结构炭纤维预制的宏观孔隙结构在空间上可以看成是由呈周期性排列的心立方&晶胞&构成; X , Y 和 Z 3个方向纤维束直径大小及比例关系决定三维正交结构炭纤维预制宏观孔隙网络的结构和形状,也是决定反应气在孔隙中的比渗透率和复合材料最终致密度的重要因素;当 X , Y 和 Z 3个方向纤维束直径的比例关系一定时,不同预制在CVI增密过程中比渗透率随孔隙率变化的趋势相同;复合材料的最终致密度一定;比渗透率随纤维束直径增大而略有增大。

The mechanism of energy accumulation and dissipation of rock masses during loading is analyzed to establish the qualitative and quantitative relations between the composition and texture and the burst potential of rock masses of coal-bearing formation.

煤岩的冲击倾向性是发生冲击地压的固有属性和必要条件,且影响煤岩冲击倾向性的因素很多;而煤岩的物质成分、岩性组构是煤岩的内在属性,是决定煤岩冲击倾向性的内在因素。

Net curtain on the very scarce Xiaomiao laver, laver frond color, frond bending, cutting-edge white cell fester loss of body uprooted seedlings off, Miller haitanensis rope was wrapped loose materials, the most serious has been the Internet without Miller.

网帘上紫菜小苗十分稀少,紫菜藻色变淡、藻弯曲,尖端细胞溃烂变白流失,苗连根脱落,紫菜苗绳被浮泥包裹,最严重的已经网上无苗。

The classification efficiency and resisting force expenses have been compaired with cyclone dust extractor by rltv empirical study.

与普通旋风除尘器进行了对比实验研究,比较了分级效率和阻力损失情况,结果表明在相同风量下,无筒旋风除尘器的分级效率高于有筒旋风除尘器;在相同风量下,无筒旋风除尘器的阻力损失较有筒旋风除尘器的阻力损失有所增加。

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