查询词典 cubic

SiO2 opal with face centered cubic structure is fabricated using a self-assembly method. Two different three-dimensionally ordered macroporous carbon materials are prepared using SiO2 opal as a template through "volume templating" and "surface templating" approaches, respectively. The final morphology of the sample can he controlled by the infiltration times.

通过自组装的方法制备了面心立方结构的SiO2欧泊，并利用其为模板，分别采用"体积模板"与"表面模板"两条途径，合成了两类不同结构的三维有序大孔碳材料，分析了填充次数对产物形貌结构的影响。

The object of the study was investigated the nanostructured precipitates and superparamagnetic properties of the γ-austenite face centered cubic Fe-9A1-30Mn-1C-0.5Si alloys, for which two kinds of specimens were solution-treated quenching in oil, and the S. T. quenching in oil then cold-forged 20%~50% strain, respectively.

本研究计画之目的，系探讨沃斯田铁面心立方结构之铁－9铝－30锰－1碳－0.5矽合金，两种试样时效热处理后内部微析出物显微结构与超顺磁性质之关系，两种试样分别为闯溶油冷与因溶油冷锻应变20%-50%，再同时於823K持温140天时效处理。

The Pd-Cu/C catalysts were shown to have the face centered cubic crystal structure. This could indicate that the addition of Cu shortened the Pd-Pd distances in the crystal lattice, and therefore –HO(subscript 2ads) and O-O could be better adsorbed on the surface of the catalyst. When NaBH4 was used as the reducing agent, and the atomic ratio of Pd to Cu was 3:1, the resulting catalysts had an average particle size of 3. 4nm and showed the best catalytic performance. The electrochemical active surface are a of Pd3Cu/C was 38.9m^2/gPd and the oxidation reduction reaction activity of the Pd3Cu/C catalyst was much higher than that of the Pd/C catalyst. The electrochemical activity of the Pd3Cu/C catalyst was comparable to that of a commercial Pt/C catalyst.

结果表明：催化剂中Pd与Cu的物质的量之比与预设值相近，Pd和Cu基本被全部还原；Pd-Cu/C催化剂为面心立方结构，元素铜的加入使催化剂的Pd-Pd间距缩小，从而HO(下标 2 ads)和OO键能更好地吸附在催化剂金属表面；当采用NaBH4为还原剂，Pd与Cu物质的量比为3：1时，催化剂(Pd3Cu/C)的平均粒径为3.4 nm，催化剂的催化性能最好，电化学活性表面积EAS达到38.9平方公尺/gPd，电化学性能较Pd/C催化剂有很大提高，接近Pt/C商用催化剂。

Crown ether was introduced to copolymerize with the monomer of styrene owing to which can associate with silver ions. The silver ions were in-situ reduced to silver nanoparticles by UV light. Then silver nanoparticles were led on the surface of polystyrene latex particles. The vertical precipitation was employed to get the spheres self-assembled into close packed colloidal crystal with a face centered cubic structure identified.

利用冠醚可与银离子复合的特性，制备了聚苯乙烯－冠醚乳胶粒，采用原位还原的方法在乳胶粒表面引入银纳米颗粒，通过垂直沉降，乳胶粒子可自组装成紧密堆积具有面心立方的聚苯乙烯－银胶体晶体。

The spherical , monodispersed , ultrafine cobalt powder with a face centered cubic structure and a size less than lum were synthesized by the reduction of tetra hydrated in glycol or 1,2-propanediol.

经(来源：A0eBccccC论文网www.abclunwen.com)过探索实验和正交实验，找出最佳制备工艺，制备出晶粒尺寸小于1um，具有面心立方晶体结构且分散性较好的球形的超细钴粉。

The value of specific capacitance was 56.4 F/g and the ESR value of the supercapacitor was 12.5 .f On the back surface of co substrate of carbon micro coils, Ni particles exhibited face centered cubic phase and hexagonal close packed phase. Only hcp Ni was found in the vicinity of the gas inlet, and Ni monolith shaped as flat hexagonal plates. Far from the gas inlet, Ni grains aggregated into flat plates without total fusion.

电容器等效串联电阻为12.5.6、碳微线圈碳基底背面有密堆六方和面心立方两种晶格结构的Ni共存；进气口附近，Ni为密堆六方晶格结构，颗粒为近似六边形的扁平晶体；离进气口较远处，催化剂小颗粒聚集成饼状的结构，相互之间没有完全熔合在一起。

Density functional theory calculation indicates that the most stable configuration for absorption is at the face centered cubic-bridge site.

密度泛函理论方法计算表明金刚烷醇在Au(111)表面的fcc-bridge位点吸附时最为稳定。

Her face was a mask of concentration, staring at the cubic machine housing.

她的脸成了专心的面具，盯着立方体机器房。

In the last part of the paper, we construct a family of 2 parameter cubic algebraic curves interpolating two given endpoints and two given tangent lines and two given curvatures at these two endpoints with different initial cases in detail.

引 言三次参数曲线在计算机辅助几何设计与计算机图形学领域一直扮演着十分重要的角色，这主要是由于三次参数曲线是具有奇异性的次数最低的曲线，这些奇异性包括尖点、拐点和闭圈。

Based on this property, by solving a series ODEs we construct a two-parametric family of helicoidal surfaces under cubic screw motion with prescribed mean curvature or Gauss curvature and solve an open problem left by Beneki.

基于这一点，当螺旋面的平均曲率或Gauss曲率为给定光滑函数时，本文选取伪正交标架，使得两类螺旋面的平均曲率和Gauss曲率的表达式相对简化，通过求解一系列的非线性常微分方程，即可确定一族生成曲线，从而最终确定平均血率或Gauss曲率为给定光滑函数的双参数族螺旋面，并在这一过程中解决了Beneki等人留下的一个公开问题。

As of Tuesday, Google's results were still censored in China.

截至周二，谷歌的搜索结果仍受中国审查。

In order to make the positive action increase and negative one decrease, the sub-forces of the social factors must be adjusted to form a centripetal force.

在这一过程中，人的主体性发挥是社会有机体健康发展的灵魂。