介晶的

Aluminosilicate mesoporous molecular sieves are synthesized with natural ore and microcline as main raw materials,and the precursors of 13X zeolite as crystal source,by integrating the synthetic procedures of mesoporous MCM-41 and microporous 13X zeolite.

以天然矿物微斜长石为主要原料，13X沸石前驱体为晶核剂，结合介孔分子筛MCM-41与13X沸石合成工艺，合成了孔壁中含有13X沸石基本结构单元的铝硅酸盐介孔分子筛。

Aluminosilicate mesoporous sieve s with 13X zeolite units in the pore wall were synthesized with a natural ore,microcline,as the main raw material,and the precursors of 13X zeolite as the crystal source,by integrating the procedures for MCM-41 and 13X zeolite synthesis.

以天然矿物微斜长石为主要原料，以13X沸石前驱体为晶核剂，结合介孔分子筛 MCM-41与13X沸石合成工艺，合成了孔壁中含有13X沸石基本结构单元的铝硅酸盐介孔分子筛。

Aluminosilicate mesoporous sieves with 13X zeolite units in the pore wall were synthesized with a natural ore, microcline ,as the main raw material,and the precursors of 13X zeolite as the crystal source,by integrating the procedures for MCM-41 and 13X zeolite synthesis.

以天然矿物微斜长石为主要原料，以13X沸石前驱体为晶核剂，结合介孔分子筛MCM-41与13X沸石合成工艺，合成了孔壁中含有13X沸石基本结构单元的铝硅酸盐介孔分子筛。

Glass ceramics with α cordierite(2MgO·2Al 2O 3·5SiO 2) as main crystal phase, having excellent dielectric property, are perfect materials for microwave parts of a medium apparatus However, the thermal expansion coefficient of the material is not high enough for some special applications Now, a novel glass ceramics with suitable thermal expansion coefficient (47 7×10 -7 / C) and excellent dielectric property (ε=5 1,tgδ0 -3 ) was developed Crystallization process and the th...

本文以堇青石微晶玻璃为研究对象，首次研制得到了一种低介（ε＝ 51）、低损耗（tgδ＜10－ 3）、热膨胀系数（46 ～48 ×10－ 7' C）能与其它器件相匹配的新型微晶玻璃介质材料通过 X射线衍射分析，扫描电镜观察等测试手段，研究了该材料的晶化过程和热膨胀系数的变化规律发现样品的热膨胀系数随温度的变化行为是与样品中析出的晶相种类及析出量随温度的变化规律相对应的

It is feasible to overgrow mesoporous MCM-41 on the rough surfaces of the grains. The obtained samples possess the ordered hexagonal mesoporous structure of MCM-41-type molecular sieves. Mesoporous molecular sieves (denoted as MZ-B) with ordered hexagonal structure have been successfully synthesized by the assembly of the precursors from filtrate of alkali-treated ZSM-5 zeolite with CTMABr surfactant micelles in alkaline media based on S+I– static electricity route.

而碱处理ZSM-5沸石得到的滤饼为富含超细化颗粒的晶粒，且晶粒粗糙度很高，因此易于附晶生长介孔分子筛，得到的微孔颗粒表面附晶生长的介孔分子筛，具有很好的长程有序度，为六方排列的孔道结构。

The influences of the wave vectors off the periodic plane on the distribution of energy bands of triangular,honeycomb and square lattices are analyzed by plane wave method .

利用平面波法分析了由介电常数为13和1的两种介质分别构成圆形柱和背景组成的三角晶格、蜂巢状晶格和正方晶格，波矢偏离周期性平面对它们能带分布及应用的影响。

Thus, the relative error between the theoretical value applied to the rhombohedral phase region and the experimental values must be more error in this region.

根据这两个方程我们得出了PT四方相区介电常数与晶格畸变之间的方程；还研究了PT立方相区介电常数、温度与晶格畸变之间的简单关系。

The results show that glass ceramics with thermal expansion coefficient of 5.11×106 ℃, major phase of α-cordierite and εr=5.5, tan σ=2.1×104 can be prepared by the addition of 3.6% alkalis(Li2O+Na2O), and Li2O occupies 1.8%. With Li2O substitution for Na2O, spontaneous crystallization is obviously enhanced, and temperature of the first crystallization peak decreases from 950 ℃ to nearly 900 ℃, but the crystallization temperature of the second peak was not varied. With the increase of Li2O content, mixed alkali effect can be observed from the thermal expansion coefficient and dielectric loss curve which decreases first and then increases. Dielectric constant decreases monotonously with the increase of Li2O content.

研究结果表明：Li2O和Na2O总含量为3.6%，其中Li2O含量为1.8%时，微晶玻璃以α-堇青石为主晶相，热膨胀系数为5.11×106 ℃，微波频率下介电常数ε r为5.5，介电损耗tan σ为2.1×104；随着Li+对Na+的取代，玻璃的析晶能力增强，初始析晶峰温度从950 ℃降至900 ℃左右，但没有降低第二析晶峰温度；随着Li2O含量增加，热膨胀系数及介电损耗都出现明显的混合碱效应，曲线呈现先降低后升高的变化趋势；样品的介电常数随Li2O含量增加单调降低。

The dependence of the frequency range on structural paramerter (crystal lattice shape, the ratio of the rod radius and the lattice constant) and electromagnetic parameter (the dielectric constants of the rods and of the background, incident electromagnetic waves with different polarization) were investigated.

同时，分析了AANR频率范围随着结构参量(晶格类型、介质棒半径与晶格周期的比值)和电磁参量(介质柱介电常量、本底介电常量、入射电磁波偏振方向)变化的行为。

The main research tasks and results are as follows:(1) Through comparing the stress intensity factor of compact tension specimen calculated by finite element software with the theoretical value, the feasibility of calculating fracture parameters of crack tip in ABAQUS software was verified.(2) The relationship between the elastic modulus of the material and research scale was studied based on deriving the cohesive stress theory and other relevant theories. And the elastic modulus of the material on meso-scale was determined.(3) Global model and sub-model of the finite element were built in th...e macro-scale, and stress-strain field nearby the crack tip was analyzed, and the results show that the detailed stress-strain in the crack tip could be obtained by using the sub-model technique.(4) In meso-scale, the crack growth model was also established by assuming the crack propagating along the grain boundary, and the detailed stress-strain field in the crack tip was obtained.(5) The effect of crack length on Von Mises stress, and maximum principal stress and strain was analyzed in meso-scale when equivalent KI equals 30MPa.m1/2. And the results show that except for crack tip area, the stress-strain distribution in whole specimen is not affected.

主要完成研究内容和取得成果如下：(1)利用有限元软件计算出紧凑拉伸试样的裂纹尖端应力强度因子KI值，其结果与理论值一致，从而验证了利用ABAQUS计算裂纹尖端相关断裂参量的可行性；(2)在研究内聚应力等相关理论的基础上，推导出了研究尺度与材料弹性模量的近似关系，并确定了介观尺度上的弹性模量；(3)在宏观尺度上建立了全局有限元计算模型和子模型，得到了裂纹尖端应力应变场分布，结果表明利用子模型技术获得比较准确的裂纹尖端应力应变场分布是可行的；(4)在介观尺度上利用平均晶粒尺度的方式建立了裂纹沿晶扩展模型，得到了裂纹尖端断裂过程区的微观应力应变场；(5)当应力强度因子为30MPa.m1/2时，分析了介观尺度上在裂纹沿晶扩展过程中裂纹长度对Mises应力、最大主应力和应变的影响，结果表明，裂纹扩展长度对试样整体应力应变分布影响不大，而对裂纹尖端区域有较大影响；(6)介。。。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。