双晶的

Toady's DVD-ROM manufactures still use the bilinear transformation to design servo controller in w-plane. In the special purpose servo chip for the DVD-ROM, because of the effect of the structure of the controller and the limits of the chip, the result of the controllers may not be implemented in the chip after designing, and redesigning is regained again and again.

目前产业界设计DVD-ROM伺服控制器仍采用双线性转换，经转换后在w平面上设计控制器，但由於受到专用控制晶片的控制器结构与限制的影响，在设计后可能无法直接套用至晶片上使用，而需反覆设计。

Gastaldi and co-workers have observed two types of contrasts in Al-Pd-Mn IQCs: black-white double-lobe and loop-shaped, by using X-ray topography, and the facetted dodecahedral pores by phase-sensitive radiography.

Gastaldi领导的小组在结合利用X射线形貌术以及相位敏感成像术研究Al-Pd-Mn二十面体准晶单晶中的缺陷时发现两种衬度，其中已知黑白双瓣衬度是由于准晶中的五角十二面体空洞引起，而对于环形衬度则除了知道退火行为不同于位错从而不太可能是位错圈外，基本上对其缺陷的几何及性质不甚了解。

This invention discloses a preparation method for anti-corrosion rare earth magnet material characterizing that it takes the optimized grain-boundary phase design as the starting point on the basis of a dual alloy method to select Nd base alloy with high crystal forming ability as the assist alloy and reduces the temperature of the press mold blank in a quartz container to room temperature from over grain-boundary phase melting point with the water extraction way to get enough cooling rate and guarantee the non-grain-boundary phase, compared with the material of the same composition prepared by ordinary method, the weightlessness of this invented material reduces over 30% after testing the weightlessness of the material by laying it for 96 hours under 121deg.C, 2 atmosphere and 100% humid environment to show the advanced performance of anti-corrosion.

本发明公开了一种耐腐蚀稀土永磁材料的制备方法，其特征是它在双合金法制备工艺的基础上，以优化晶界相设计为出发点，选取具有较高非晶形成能力的Nd基合金为辅合金，并在烧结回火时将置于耐高温石英容器中的压型坯件，从晶界相熔点以上以水淬冷却的方式降温至室温，以达到足够的冷却速率，确保得到非晶晶界相，根据本发明制得的耐腐蚀稀土永磁材料，通过测量在121℃、2个大气压以及100％湿度环境下放置96小时后材料的失重情况，结果显示本发明得到的材料与常规方法制备的相同成分的稀土永磁材料相比失重减少了30％以上，充分证明其具备了更优越的耐腐蚀性能。可广泛应用于电子、汽车、计算机、电力、机械、能源、环保、国防、医疗器械等领域。

In addition to the black-white double-lobe caused by the displacement field around pores, we demonstrate that LSC should correspond to a novel, peculiar class of anti-phase domain, of which the interior is a local isomorphism with a non-zero phason-type displacement ε〓w〓 i.e.

利用这个结果，我们发现黑白双瓣衬度是二十面体准晶中的多面体微孔引起，而环形衬度则对应于一种二十面体准晶中新奇的反相畴界，其两侧是由相位子型位移ε〓w〓＝B〓联系着的局域同晶类。

In order to investigate the influence of surface tension gradient driven convection on solidification behavior of alloys under microgravity, remelt and solidification of Al-Al〓Ni eutectic alloys, which have characteristics of directional growth along temperature gradient, were carried out on board Chinese retrievable satellite.

利用我国返回式科学实验卫星搭载的梯度炉和Al-Al〓Ni共晶合金定向生长的特点，研究了与重力无关的表面张力驱动对流（Marangoni对流）对合金凝固行为的影响，在空间微重力下获得了弯曲的双涡放射状共晶组织。

The copper atom is in a planar coordination site of [N_2O_2] and it devites from the mean plane by only 0.80 pm. Byπ-πstacking interactions, a alabastrine structure was obtained.(2)Schiff-base complex [Cu(H_2O)]·H_2O, where H3GS is the 3-carboxyl -salicylidene glycine, was synthesized and characterized by elemental analysis, IR spectra and single-crystal analysis. The crystal belongs to monoclinic system, space group P2(1)/c, a=848.46(3)pm, b=681.54(3)pm, c=1967.16(8)pm,β=95.8210(10)°, Z=4, R_1=0.0279, wR_2=0.0724. The copper atom is in a square-pyramidal field with the base

结果表明该晶系属单斜晶系，空间群P2(1)/c，晶胞参数：a=848.46(3)pm，b=681.54(3)pm，c=1967.16(8)pm，α=90°，β=95.8210(10)°，γ=90°，Z=4，R_1=0.0279，wR_2=0.0724，Cu原子位于轻微变形的四方锥场底心，底面被氮原子、酚氧原子、甘氨酸羧基的一个氧原子和一个水分子氧原子占据，而甘氨酸羧基的另一个氧原子占据相邻分子的锥顶，因而形成一维链状结构；合成了单核双聚配合物Na_2[Cu_2_2]·2H_2O ，铜三核配合物Cu_3_2·5H_2O和铜锌异三核配合物ZnCu_2_2·5H_2O，并用元素分析，IR光谱，电子光谱和磁化率测定对配合物的组

The synthesis,characterization and mesomorphic properties of new dimerliquid crystalline compounds D-mn and their derivatives D2F-mn based on4-(trans-4-alkyl cyclohexyl)benzoic acid and cholesterol are described in this thesis.

本文描述了一系列新型双介晶结构液晶化合物ω-[4-(反-4-正烷基环己基)苯甲酰基]脂肪酸胆固醇酯及衍生物(D2F-mn)的合成及其结构表征和介晶性质。

All the complex series based on 4',4''-dicarboxy-1,6-diphenoxyhex- ane (C6-2COOH) and 4',4''-dicarboxy-1,10-diphenoxydecane (C10-2COOH) possessed higher melting and clearing points, usually showed soft crystal or crystalline smectic phases and crystal polymorphs except C10-2COOH/ p -PhBPy complex displaying also an enantiotropic nematic phase, while the complexes based on 4,4'-dicarboxy-α,ω-diphenoxy tetraethyleneglycol ether (C8O4-2COOH) with a longer flexible spacer exhibited monotropic fluidic smectic SmA and/or nematic phases.

研究表明，分别具有较短的6或10个亚甲基的烷烃间隔基的双苯甲酸衍生物4'，4''-二羧酸-1，6-二酚氧基己烷(C6-2COOH)和4'，4''-二羧酸-1，10-二酚氧基癸烷(C10-2COOH)的系列复合物具有较高的熔点和清亮点，一般都只出现结晶近晶相和多晶型转变现象。

The crystal structures have been determined by X-ray diffraction method, which show that the new complex [Co2-Co(2)(0H2)s] belongs to the bridging binuclear complex and the system of monoclinic with space group P211~,unit cell parameters a8.3850(10)A, b=27.386(4) A, c=9.610(2) A,~=98.280(10)~,V=2 183.8(6) A3 , Z=4, Dc=l.746Mg/m3,~i =l.597mm, F(000)=1168, Final R=O.0253 and wR=O.0610 S1.009 ,The two Co2~ are in distorted octahedrons. The part of [2Co] possess an approximate D2d symmetry, while the part of [OCo(2)(0H2)5] has an approximate C2 symmetry.

结构分析表明配合物(1)[Co1，(DPC2-Co(2)(OH2)5]是一个未见报导的桥联双核配合物，属单斜晶系，空间群为P2_1／c，晶胞参数：a=8.3850(10)A，b=27.386(4)A，c=9.610(2)A，β=98.280(10)A，V=2183.8(6)A~3，Dc=1.746Mg／m3，Z=4，μ=1.597mm-1，F(000)=1168，结构偏离因子R=0.0253和ωR=0.0610，吻合因子S=1.009，Co_(1)和Co_(2)的配位多面体皆为扭曲正八面体，[_2Co_(1)]部分具有近似D_(2d)对称性，[OCo(2)(OH_2)5]部分具有近似C_2对称性。

The rate dependent crystallographic finite element program was implemented in ABAQUS as a UMAT for the analysis of the stress distributions near grain boundary in anisotropic bicrystal s and tricrystals, talcing the different crystallographic orientations into consideration.

采用率相关晶体滑移有限元程序对不同取向晶粒构成的双晶体和三晶体在晶界和三晶交点附近的应力集中特性进行了计算分析。

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。