结构稳定性

Our country firstly put forward such design principle of Qinghai-Tibet railway engineering as "lower temperature actively, reduce the heat into the subsoil, and assure the heat stability of frozen earth for the quality stability of construction", creatively adopt such corresponding measures of frozen earth construction problem as: for the poor frozen earth developing section, line should avoid as possible;for the geology of ice at high temperature and unstable frozen earth zone, the method of bridge instead of subgrade shall be adopted;in subgradeconstruction, such facilities as heat stick, rubble ventilation subgrade , rubble ventilation berm, ventilation pipe subgrade and laying heat preservation board etc shall be adopted to raise the stability of frozen earth subgrade;during the excavation of bridge, culvert , foundation pit and scouring prevention trough, creatively adopt single-tooth knapper and solve the problem of frozen earth excavation;during the construction of bridge and culvert, durable concrete and three-step maintenance method are adopted to assure the outside and inside beauty of structure.

我国在世界上首次提出"主动降温、减少传入地基土的热量、保证多年冻土的热稳定性，从而保证修筑在上面的工程质量的稳定性"的青藏铁路工程设计原则，创造性地采取了解决冻土施工难题的相应对策：对于不良冻土现象发育地段、线路尽量绕避；对于高温极不稳定冻土区的高含冰量地质，采取"以桥代路"的办法；在路基施工中采用了热棒、片石通风路基、片石通风护道、通风管路基、铺设保温板等多项设施，提高冻土路基的稳定性；在桥涵基坑、挡水埝基槽开挖中，创造性地应用了单齿破碎器，解决了冻土开挖难题；在桥涵工程施工中，采用了耐久性混凝土，采用了三步养生法，保证了结构物内实外美。

The concepts of weight lattice structure, sphere lattice structure and lienor lattice structure are introduced to describe it, some properties of the k-error lattice structure are given, and a relationship between the k-error lattice structure and the k-error linear complexity is presented. These create a elementary frame of the stability theory of the lattice structure.

提出了伪随机序列格结构的稳定性问题，引入重量格结构、球体格结构、k-错格结构等概念来描述之，给出了k-错格结构的一些基本性质，并研究了k-错格结构与k-错线性复杂度的关系。

On the basis of the improved structure and under the premise of meeting specification requirement, the light steel door-truss structure is optimally designed by changing, cycle checking and gradually reducing the cross section size of overall structural member with the ANSYS parametric design language. The mechanical properties such as changes in stiffness, strength and stability of the optimized structure are completely analyzed under three load cases.

基于改进结构，在满足相关规范的前提下，利用ANSYS软件的参数化命令流语言（ANSYS parametric design language， APDL），通过改变结构杆件截面尺寸，对整体结构杆件的截面采用循环校核、递减尺寸，并对轻钢门式桁架结构进行优化设计，分析了优化结构在3种荷载工况组合条件下的整体刚度、强度及稳定性等力学性能的变化，给出了改进前后与优化前后结构的力学特性对比。

The invention discloses a method to integrate single CMOS with bulk silicon microelectromechanical system, its technical project: 1 forming isolating groove: adopting deep-groove etching, and SiO2 and polycrystal silicon filling to realize the insulation of MEMS structure and CMOS circuit; 2 making standard CMOS circuit; 3 using SiO2 and Si3N4 as mask, etching silicon on the back until exposing SiO2 at the bottom of the isolating groove, to complete the thickness control for MEMS silicon structure layer; 4 completing metalizing the CMOS circuit and masking the MEMS structure: MEMS structure region uses Al as mask and CMOS circuit region uses thick photoetching glue as mask, using DRIE to release silicon structure.

本发明公开了一种将单片CMOS与体硅微机械系统集成的方法，其技术方案为：1形成隔离槽：采用深槽刻蚀，SiO 2 和多晶硅填充，实现MEMS结构和CMOS电路的绝缘；2完成隔离槽后进行标准CMOS电路的加工；3用SiO 2 和Si 3 N 4 作掩膜，从背面腐蚀硅，直至暴露出隔离槽底部的SiO 2 ，完成MEMS硅结构层的厚度控制；4完成CMOS电路金属化和MEMS结构掩膜：MEMS结构区用铝作掩膜，CMOS电路区用厚光刻胶作掩膜，用DRIE释放硅结构。用本发明方法不仅获得了较大的质量块，而且用本发明较高的深宽比制作出的结构电容，同时实现了体硅微机械与CMOS电路的集成，显著提高MEMS传感器的精度和稳定性，具有前沿性和重要实用价值。

The coming forth of virtual prototyping technology presents a new approach to study gun stability, and based on establishment of dynamic model of selections of structure parameters, the effects of stiffness and damper of elevating mechanism, stiffness and damper of trail, stiffness and damper of soil, parity of recoil mass and parity of trunnion position on firing stability are first studied with virtual prototype of gun in this paper. An improved equation of sensitivity analysis is provided, and the important degrees of factors with different dimensions can be compared.

虚拟样机技术的出现为火炮射击稳定性研究提供了新的方法，文中在建立火炮动力学模型的基础上，通过选取火炮结构参数对火炮射击稳定性进行研究，利用虚拟样机分析高低机刚度和阻尼、大架刚度和阻尼、土壤介质刚度和阻尼、后坐品质偏心和耳轴位置偏心对火炮射击稳定性的影响。

The thesis toke problem of deformation and destroying of the earth mass as it's invention, integrated the earth mass's existing environment, ingredients and macrostructure, discovered mechanism of deforming and destroying, made clear the relationships between those.Through outdoors samples, indoors examination surface wave testing and audio wave testing ,do some research on physical, mechanical, chemical, disintegrative and dynamics property of stuff of earth mass and proposed four kinds of earth mass's stuff formed type;under the guidance of theory of dominant structural surface and adopting precision measurement of structural surface, proposed three dominant kinds of structural surface assembling;based on those , proposed four types of earth mass's deformation and destroying, carried out rationed estimation of stability on four types, then definite the characters of deforming and destroying and controlled relation between environment , stuff, macrostructure and deformation and destroying of mass earth, and breakthrough ordinary principle about soil's deformation and destroying, further proofed the theory of earth mass cybernetics's popularization

本学位论文针对台地危险土体的变形破坏问题，将土体的赋存环境、土体物质组成和土体宏观结构的研究紧密地结合，阐明了土体变形破坏的机制，明晰了土体变形破坏与土体的赋存环境、土体材料组成、土体宏观结构三要素之间的关系，并从土体的物质组成的角度，以野外取样、室内实验、现场面波、声波无损伤测试为手段，研究了土体物质的物理、力学、化学、矿物、崩解性、动力学性质，提出了研究区内土体物质成分的四种组合形式；以优势结构面理论为指导，以结构面的精确测绘为手段，通过统计、归纳与分析，提出三种有利于台地危险土体变形破坏的优势组合形式；据此提出了具有广泛代表意义的台地危险土体变形破坏的四种模式，并对其进行稳定性评价，从而明确了危险土体的宏观结构对变形破坏的控制作用，映证了土体结构控制论。

By using multi-dimensional nuclear magnetic resonance method we have studied the folding mechanism of staphylococcal nuclease in vitro; the tertiary interactions for folding of SNase fragments into native-like conformation; the interaction between SNase N- and C-terminal subunits; the relationship of enzyme activity with folding and dynamic states of SNase; the structural properties of enzyme protein while exert its function. We have studied the internal motions of thermophilic Archaea protein Ssh10b and mechanism of its heat-resistance using the NMR 1H-15N relaxation and H/D exchange methods. We have determined the 3D solution structure of human translationally controlled tumor protein TCTP and the Ca2+-binding site; determined the 3D crystal structure of human mitoNEET, a novel protein from distinct groups of iron-sulfur proteins; determined the 3D solution structure of a novel chromatin protein Cren7. Determination of SNase-DNA and Archaea protein-DNA complex structures are in progress.

运用异核多维核磁共振方法研究了金黄色葡萄球菌酶体外折叠机制，酶蛋白片段体外折叠成类天然溶液三维构象的三级相互作用力，酶蛋白亚基间的相互作用，酶蛋白的折叠以及内运动状态与酶活力的关系，酶蛋白发挥功能时的结构特性；运用NMR的1H-15N 驰豫和H/D交换方法研究了嗜热古菌蛋白质Ssh10b双体结构内运动特性，热稳定性机制；确定了人翻译控制的肿瘤蛋白TCTP蛋白的溶液三维结构及其钙离子的结合部位；确定了一类新的铁硫蛋白家族蛋白人线粒体膜上mitoNEET蛋白的晶体结构；确定了一个新型的染色质蛋白Cren7的溶液三维结构；正在研究金黄色葡萄球菌酶及嗜热古菌蛋白质与DNA复合体的溶液三维结构。

The results show that as the crown density reduces the foresttype diversity increases and as the diversity goes up the stability of stand comes down; that the forest is under regressive succession and its stability now is the lowest; that the growth of spruce and fir trees has obviously a n...

结果表明：该林区的林分类型多样性随郁闭度的降低而增加，林分的稳定性随多样性的增加而降低，林分处于逆向演替过程中，林分的稳定性处于最低限；云、冷杉林与环境因子——海拔之间呈明显的负相关；在高海拔区云、冷彬林十分脆弱，一旦原有种群结构的郁闭度低于0.3，森林的稳定性将被破坏，即使在完全封禁的条件下，25年生的疏林要恢复到有林地状态，需要40年的时间。

This thesis comprehensively summarized the dumping stability of the dump truck, investigated the steady-state stability and the dumping stability of the dump truck, and also analyzed significant ground slope, shifting loads, the suspension and the tire of the dump truck on the rollover effects.

论文综述了自卸汽车作业稳定性的研究现状，结合三角臂组合式举升机构的自卸汽车的结构特点，对其静态、作业稳定性以及影响自卸汽车作业稳定性的各种因素进行了分析。

LsEQ is the ability of landscape eco-system to maintain self-stability of structure and function.So,assessment standard of LsEQ is defined to be the stability of landscape eco-system which lies on the contrast of interior stabilization degree and exterior ecological disturbance degree of landscape eco-system.

景观生态质量是景观生态系统维持自身结构与功能稳定性的能力，因此，景观生态质量的衡量标准是景观生态系统的稳定性，其稳定性取决于景观生态系统的自身稳定程度与外部生态学干扰程度的对比。

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。