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In summary, the grain boundary effect in the CMR granular composites strongly depends on the second phase propertied and material preparation method. MR can be enhanced at higher temperature range by appropriate choice of the second phase.

由此可见,不同的第二相材料和工艺制备方法对锰氧化物颗粒复合系统的颗粒边界效应有显著的影响,通过选择合适的第二相材料可以提高磁电阻增强效应所发生的温区。

In the electromagnetic field that countercurrent inductor produces, the metal droplet that melts gets the role suspension of electromagnetism force in quartz pipe center and had been heated up continuously. When metal droplet of melting have been heated up certain temperature surface beginning gasification, metal vapor tension will raise follow temperature go up, is heated continuously can have plenty of metal atoms overflow metal ball liquid surface, at the same time, as the inert gas of cooling medium, all along with certain current velocity, sideswipe the metal droplet surface that melts. Metal atoms fly out liquid surface according to certain way form the atom cluster by the condensing of inert air current, merger and the collision between crystal nucleus pellet and atom cluster form the smoke flame of nanoparticle pellet eventually.

在逆流感应器产生的电磁场中熔化的金属液滴受电磁力的作用悬浮于石英管中央并继续被加热,当金属熔球被加热到一定温度时表面开始气化,金属蒸气压随温度的升高而升高,继续受热会有大量的金属原子飞出熔球液面,与此同时,作为冷却介质的惰性气体始终以一定的流速掠过熔化的金属液滴表面,原子飞出液面受冷后就按照一定的方式凝聚成原子簇,在惰性气流中形核并随之长大,颗粒、原子簇间的碰撞与合并,最终形成金属纳米颗粒的烟焰。

In a series of 300 brain autopsies, 18 cases were diagnosed as Alzheimer 's disease with 10 male and 8 female average age 71.2 years(61 to 86) and courses of disease 0.5 to 6 years. All of them presented some degree of intellectual impairment. The clinical symptoms Progressed gradually. Pathologically, in all cases brain atrophy (mild degree in 6 cases, moderate degree in 8 cases and severe degree in 4 cases)was observed.Microscopically large amount of senile Plaques and neurofibrillar...

在连续300例尸检脑标本中,筛选出60岁以上18例Alzheimer病,占6%;病程6个月~6年,均表现不同程度的智能障碍。18例病理检查见重度脑萎缩4例,中度8例,轻度6例;镜下于脑叶皮质和海马区见大量老年斑及神经原纤维缠结,8例海马区有颗粒空泡变性。18例脑皮质神经元均明显减少,与对照组比较差异有非常显著性(P<0.0001)。11例AD并存有淀粉样脑血管病。

The mice all survived after two weeks. Nanoparticles was harmful to liver and lung to some extent, especially to liver. The modified nanoparticles was little toxical.

经两周观察,未见小鼠死亡情况,纳米颗粒对小鼠的肝脏与肺脏均有不同程度的伤害作用,对肝脏的影响较大,且经过改性的纳米颗粒的伤害作用相对较小。

After the addition of carbon, the microhardness in the grain boundary is about 150 MPa higher than that in the grain. The fracture type of pure Mo is intergranular fracture, the grain boundary strength of Mo-C alloy is strengthened due to the addition of carbon and the fracture type is changed to transgranular fracture, transcrystalline fracture and a large number of cleavage planes and steps are observed on the bending fracture surface. But if the carbon content is too high, the carbide precipitation will be severe at grain boundaries and is deleterioated to the ductility of the alloy.

添加碳后,合金的晶界显微硬度比合金的晶内显微硬度高150MPa左右;纯钼的断裂方式以沿晶断裂为主,添加碳后,由于合金的晶界强度得到提高,合金的断裂方式变成以穿晶断裂为主,断口上有大量的解理面,具有明显的河流状花样和解理台阶,且塑性越好的断口,撕裂岭也越多;当添加的碳含量偏高时,在晶界处产生了大颗粒的碳化物,这种大颗粒的碳化物会降低合金的塑性。

In this dissertation,Co-Cr2O3 and Fe-Cr2O3 granular films with superiorproperties have been successfully fabricated by RF co-sputtering technique underroom and 77K substrate temperatures for the first time.The microstructure,electrical transport and magnetic properties as well as their relation to TMR effectare systematically investigated by various techniques such as X-Ray diffraction,transmission electron microscopy,electrical diffraction,X-Rayphotoelectron spectroscopyand VSM,etc.,the change of electrical transportand magnetic properties in these films with their microstructure is also shown.Someinteresting and valuable results have been obtained after the theoretical fitting ofexperimental data with the existed theory.The temperature dependence of TMReffects in these films and the way to get larger TMR effect is also studied.Our mainprincipal results obtained are as follows:(1)Microstructure and Magnetism

在本论文中,我们采用射频共溅射方法,在室温及77K的衬底温度下首次成功地制备了性能优异的Co-Cr2O3及Fe-Cr2O3系列颗粒薄膜,并利用X-Ray衍射、透射电镜、电子衍射、X-Ray光电子谱及宏观电性及磁性测量等手段详细地研究了Co-Cr2O3颗粒膜的微结构、电性、磁性及它们与TMR效应之间的关系,系统地研究了薄膜的电性和磁性随薄膜微结构的变化,通过实验数据点的理论拟合,得出了一些有价值的物理信息,探讨了磁电阻效应的温度依赖性及获得较大TMR效应的途径,主要内容可概括如下

To reveal the influence mechanism of ground granulated blast-furnace slag and fly ash on the physical and mechanical behaviors of cementitious materials, and to provide some necessary parameter for computer simulation of the physical and mechanical issues of the cementitious materials, the elastic modulus of cement, GGBS and fly ash particles were measured in situ by nano-indentation techniques.

为了揭示磨细矿渣和粉煤灰对水泥基材料物理力学行为的影响机理,为应用计算机模拟掺有矿渣或粉煤灰的水泥基材料的物理力学行为提供必要的力学参数,应用纳米压痕技术实测水泥、磨细矿渣和粉煤灰颗粒的弹性模量。用酚醛树脂混合水泥、磨细矿渣或粉煤灰颗粒后再进行磨光、抛光和超声波清洗等工艺制得表面光洁度符合纳米硬度仪要求的试样。

Unsteady numerical simulation and analysis of the flow fluctuation in the Roots blower;2. The characteristics of gas solid jet are researched and the characteristics of gas\|solid jet fluctuation are proved by means of Rescaled Range Analysis.

流化床内颗粒的混合对流化床内颗粒运行以及燃烧有重要的影响,因此,利用图像处理技术在二维流化床试验装置上研究了水煤膏的混合过程,分析了气固两相射流的流动特性,利用R/S分析方法表明了气固两相射流的脉动特性。

From water to silt to various kinds of dust particles, wam also has abundant experience to offer the most suitable speed of transport and special lubrication and seal installation. as the world-famous dust and particle equipment manufacturers, wam group has the output of more than 25000 screw conveyer, this make it become the dust particle technological authority and one of the biggest equipment supplier in the world; wam was entered and stationed in china through the hong kong agent in 1996, established wam bulk handling machinery co., ltd. in 2000, established the wam bulk handling machinery international trading co., ltd.(all selling operation in china of the products are charged by this company) in 2002, meanwhile, wam has other co-partnership companies in china.

从水到淤泥到各种粉尘颗粒,wam都有丰富的经验提供最合适的输送速度及特殊的润滑和密封装置。wam集团每年25000多台螺旋输送机的生产量使其成为世界上粉尘颗粒螺旋输送的技术权威和最大的设备供应商之一。1996年wam通过香港代理商进驻中国, 2000年成立了全资子公司威埃姆输送机械有限公司、2002年成立了威埃姆输送机械国际贸易有限公司(由该公司负责威埃姆集团的产品在中国的全部销售业务),同时,wam在中国还拥有其他合资公司。

The results show that the pressure gradients and radial distribution profiles of solids holdups and the effects of operation conditions on them are quite different from those of FCC. For sand particles, different non-uniformities of radial distribution of local concentrations are observed.

论文研究结果表明:粗重颗粒在床层中的压力梯度以及浓度的轴向和径向分布和其随操作条件的变化规律与目前关于FCC颗粒的实验结果有明显的差异。

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According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm~150rpm时取得最大值,此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世,形体几无变化。

When I was in school, the rabbi explained everythingin the Bible two different ways.

当我上学的时候,老师解释《圣经》用两种不同的方法。