力学

OBJECTIVE: To establish a three-dimensional finite element model of a mandibular molar with dental implant inserted in mandibular molar area using reverse engineering, and to provide mathematical model basis for biomechanics researches of stomatology.

目的：利用逆向工程快速建立含下颌磨牙种植义齿的颌骨三维有限元模型，为口腔生物力学的研究提供数学模型基础。

Of the late two years,in order to find out a kind of dental implant ing materialwhich would possess both the very good properties of biological compatibility,the chemical compatibility and the mechanical compatibility,an animal experi-mental preselection was accomplished by our research team with six kinds of im-planting material chosen from four main sorts of oral implant ing material(met-al,ceramic,high polymer and carbon),As the result of the Preselection,thematerial……bio-ceramic was chosen by ...

为了寻求生物相容性、化学相容性和力学相容性均好的种植材料，在口腔四大类种植材料(金属、陶瓷、碳素、高分子)中，选用6种材料作了动物实验预选。根据预选结果，选定以生物陶瓷为主攻方向，从而研制成功锆磷灰石陶瓷，以之进行了理化性能、生物学性能、及动物实验考查，合平种植要求。并以考查结果与钛合金、多晶氧化铝、单晶氧化铝、钛合金喷涂氧化铝、低温各向同性碳、聚砜种植作了比较，主要性能均较其它几种比较材料为优。经临床初试，锆磷灰石陶瓷的种植效果也较好，其界面为骨性结合。

For the purpose to study its critical issues for fusion application, many kinds of V-W-Cr-Ti-Al alloys were developed, and were used for studies of recovery and recrystallization, aging behavior and precipitation hardening, high-temperature mechanical performance, effects of H on mechanical properties and hydrogen enbrittlement, H release behavior and oxidation behavior at elevated temperature. Mechanizms for the behaviors were analyzed and the relationship between chemical composition, microstructure and properties was established.

为研究其聚变应用关键问题，本项目研制了多种V-W-Cr-Ti-Al合金，利用它们完成了合金的回复和再结晶、时效行为和析出强化、高温力学性能、氢对合金力学性能的影响及氢脆、氢释放行为、高温氧化行为等研究，分析了合金的行为机理，建立起了合金性能与化学成份、微观组织结构的关系，是以后研制更高性能合金的基础。

If the fluidity of the injection was bad, the appearance of the product would berough, brittle, and very difficult to satisfy the actual application. In order to improve thefluidity of the melting-body in full filling condition, different types of lubricant function were used in the paper. Though the metallic soap might enhance the fluidity of themelting-body, the dosage was huge, which might cause drops on the mechanics intensityof the product, and cause magnet to be crisp and easy to crack.

为改善在高填充时熔体的流动性，研究了不同润滑剂的作用，金属皂类可以提高熔体的流动性，但用量较大，会导致产品的力学强度的下降，磁体脆而容易开裂，乙撑双硬脂酰胺可以提高熔体的流动性，复合材料的力学强度也较高。

Mechanical models and differential equations of motion for high speed pantographs;2. By the principle, differential equations of motion for variable-mass nonholonomic systems constrained to the fixed axis rotation are obtained.

建立了变质量力学系统在定轴转动参考系中的Jourdain原理，由此得到了受定轴转动约束的变质量力学系统运动微分方程，给出了准坐标形式，最后举例说明方程的应用。

In order to solve the frost heave and thaw settlement, the model tests were made in Tibetan Plateau.

中国科学院武汉岩土力学研究所岩土力学重点实验室，湖北武汉，430071

The experimental verifications show that the theoretical calculation of fracture toughness is well in agreement with the measured toughness.

详细研究了复相陶瓷刀具材料JX-2-Ⅰ的界面力学行为及其与材料力学性能的关系。

This thesis is divided into two parts, investigating the elasticity and statistical mechanical prop- erties of deoxyribonucleic acid molecule.

本文分两部分，研究脱氧核糖核酸分子的弹性力学和统计力学性质。

The mechanical analysis showed that the effect of the DMSO was better than glycerol and glycerol/water.

动态力学和拉伸力学性能测试结果表明，经过DMSO的增塑，有效降低了淀粉的玻璃化转变温度，改善了材料的韧性，增塑效率要好于甘油及甘油／水复合增塑体系。

Three displacement functions w,Gand ψare introduced in this paper tosimplify motion equations of elasticity problenis in spherically isotropic media to an indepen-dent partial differential equation concerning one displacement function ψand simultaneous equations concerning two other displacement functions w and G.

本文引入三个位移函数，将球面各向同性弹性力学运动方程，简化为关于ψ的二阶偏微分方程，和关于W和G的联立方程。在静力学问题中，联立方程可进一步简化，w和G可用另一位移函数F表示，而F满足一个四阶偏微分方程。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。