结构稳定性

The structural stability of pressure tank for a submarine is analyzed using finite element method.

用有限元法分析研究潜艇耐压液舱结构的稳定性问题。

The paper first studies the primary analyse method of static voltage stability problem such as continuous power flow, sensitivity analysis and eigenvalue structure analysis.

本文首先对静态电压稳定性的主要分析方法如连续潮流法、灵敏度分析法和特征结构分析法进行研究，介绍了它们各自的原理、特点以及在电压稳定分析中的作用。

In the light of all kinds of structural faces and their assembles along tunnel, the place and growth depth of instable cuneiform body in tunnel wall rock could be predicted, then its volume and weight of instable cuneiform body are estimated based on the equator plane projecting method and the solid body ratio geometry method, which offers reliable geologic data for designing corresponding supporting measure.

摘要利用赤平投影法和实体比例几何法分析隧洞围岩稳定性，根据隧洞沿线所遇结构面相互组合形式，预测隧洞围岩不稳定楔形体的位置及其发育深度，从而估算不稳定楔形岩块的体积和重量，为设计相应的支护措施提供可靠的地质依据。

The HMCM-22 was found to be highly active for the hydrolysis of pyran with high yield and stability.

结果表明，HMCM-22因其独特的结构和表面酸性，对吡喃的水解具有很好的催化性能，时空收率高，稳定性好。

The results indicated that the passive films showed a distribution of multi-layer structure and properties of p-type semiconducting in the conditions of quiescence.

结果表明，静态条件下， 0Cr13Ni5Mo和1Cr18Ni9Ti不锈钢均发生了钝化，钝化膜呈多层结构分布；空化条件下，钝化膜的稳定性降低，半导特性发生反转。

Their infrared spectrum changes under UV-irradation and in the heating process have been monitored by ATR-FTIR. Then the aging mechanism has been induced by the infrared spectra before and after aging and their difference spectra. In the condition of UV-irradiation, the polyurethanes degrade to quinoid structures or azo-compounds, which is why polyurethanes' color can easily become yellow.

在紫外线照射下，聚氨酯类有机高分子涂料降解生成偶氮化合物或醌式结构，这也是聚氨酯老化颜色易变黄的原因；丙烯酸类有机高分子涂料降解机理为酯基断裂、形成稳定性较好的内酯，同时伴随侧链断裂的反应。

The principles of remote sensing in earth scinences were used in the investigation of resources and environment of the region to analyze hydrologic elements, regionalize hydrologic environment types, calculate water-yield; study the ratio relationship among agriclutural landuse, non-agriclutural landuse and total area, point out the regional difference of landuse type;res-earch the qualitative and quantitative perfects of low-yield area environment; cornprensively investigate forest resources, including ecologic environment of the suitable-forest area, site and ecologic and economic perfects of suitable-forest tree; find out the travel circle surrounding Beijing and function regionalization, storage mechanism of mineral resources and crustal stability, evolution of natural environment in last ten thounsand years and the relationship between them and land harnessing, planning and city and town construction.

本区资源与环境的遥感调查应用，主要是运用遥感地学原理，分析水文下垫面要素，划分水文环境类型，计算其产水量；分析非农业用地与总土地及其它用地的比例关系，探索土地利用类型结构的地域差异规律；农业低产地环境及其数量、质量特征的研究；综合调查森林资源，包括宜林地的生态环境、立地条件及宜林树种的生态与经济特性；以及以北京为中心的京津唐旅游圈及功能分区，矿产资源的赋存机制，区域地壳稳定性及区内近一万年来的自然环境的演化规律及其与国土整治、规划和城镇建设的关系等进行了多元综合研究。

Especially,the complex relative permittivity of the coated barium ferrite composite was much higher than that of the uncoated barium ferrite particles in the most frequency range.

六角晶系铁氧体具有较高的饱和磁化强度、特殊的六角片状结构、良好的化学稳定性和耐腐蚀性能，在微波吸收等领域具有广泛用途[2-3]。

Structures and relative stability of medium-sized SiN clusters(21≤N≤50 and N=60).

中等尺寸SiN团簇结构和相对稳定性的研究(21≤N≤50，N=60)。

At the same time, the body structure was extensively revised, improving rigidity and stability.

与此同时，在车身结构进行了广泛的修订，提高刚度和稳定性。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。