主要动力

The presence of albumin around the wound is one of the factors that influence the efficiency of PDI.

伤口部位周遭的白蛋白为影响光动力效果的主要原因之一。

From the fact of sanitation school's students, we think that the mainly contents of affection education in physics teaching in sanitation school are that developing students'study drive, study attitude, study interest, self-trust and amour-propre.

从卫生学校物理教学的具体目标和学生实际状况出发，我们认为卫生学校物理教学中情感教育的主要内容是：学习动力、学习态度、学习兴趣、自信心和自尊心的培养。

The basic approach of protecting people from being hurt or killed in an accident is to improve crashworthiness of vehicles. This paper starts with discussing theories and methods for vehicle passive safety design, which included experiential methods, analytic methods, multi-body dynamics methods, crash test methods and the finite element method. Emphasis will be paid to the basic FEM theories and algorithms of impact problems. Topics discussed include the governing equation, element discretization, hourglass control, time integration, material model, shell element algorithms and contact-impact algorithms. For more reliable simulation results, this paper then conducts study on how to accurately get material model parameters by combining the FEM method with experimental method, and develops relevant material test machine and parameter calculating software. Based on that, basic typical impact simulation and test validation study are conducted. On the basis of the above work, the paper studies the thin-shell structures'crashworthiness, which was affected by the following factors: spot-weld features, shell thickness, cross-section and pre-deformation. As to vehicle parts'crashworthiness, the paper conducts simulation study of designing energy-absorbing steering system and adaptive airbag system. A practical energy-absorbing steering wheel is designed as an example. In further depth research, the paper suggests several inverse quantificational methods for vehicle crashworthiness design based on the ideal crash characteristics. The above theories and methods are applied with good results through several practical vehicles' crashworthiness design and improvement.

文中对汽车碰撞安全性的设计理论和方法进行了归类和总结，其中包括经验法、解析法、多刚体动力学法、试验法以及有限元方法等；重点介绍了碰撞有限元法的基本理论和有关算法，涉及到有限元求解控制方程、单元离散、沙漏模态控制、时间积分、材料模型和应力修正、薄壳单元算法以及接触碰撞界面算法等，探讨了有限元计算中的材料模型参数获取技术，开发了相应的材料试验装置及材料模型参数反求软件，在此基础上进行了基本的碰撞仿真算例和试验对比研究；文中通过应用有限元方法研究了薄壁构件的碰撞吸能特性，指出了设计薄壁吸能构件时需要考虑的几个主要影响因素，即焊点、壁厚、横截面和预变形等；在关于车辆部件的碰撞安全性能设计中进行了吸能转向机构和自适应安全气囊的仿真研究，提出了吸能转向机构和自适应安全气囊的仿真研究方法；文中最后探讨了整车碰撞性能的设计与改进方法，提出了以理想碰撞特性为目标，采用分段加速度或者根据碰撞时间进行设计的反推设计法、部件吸能仿真优化设计法等量化设计方法，并通过综合应用文中所讨论的相关技术进行了整车碰撞性能的设计与改进实例研究，所选定的车型是大众化的普通轿车和碰撞安全性基础较差的微型面包车，研究结果表明，本文所提出的设计与改进方法是适用而有效的，具有重要的工程实用意义和价值。

With the method of FEA, the research of tension and anchor system of steel rod is carried out on the basis of the theory of the redevelopment of Ansys. The analysis theory, the static stability behavior and dynamic performance of the system is studied, as well as construction technique.

本文以有限元分析为主要手段，并在Ansys二次开发基础上，展开对钢棒张拉锚固体系的研究，对其计算理论、静力稳定性能及动力性能、施工工艺等方面进行了研究。

HUANG Jiqing gave a brilliant exposition with E. Argand's mobilism thought as to the dynamical evolution process of the tectonics in On Major Tectonic Forms of China.

在《中国主要地质构造单位》中，他运用阿尔冈活动论的思想，阐述了中国大地构造的动力演化过程。

Its principal resource was the river, the fast-flowing Arno, which provided power and water for industry and access to the sea for imports and exports.

它主要的资源——湍急的阿尔诺河不仅为其工业发展提供了动力和水源，也为进出口贸易提供了入海口。

In this article, we mainly discuss the asymptotic behavior, existence for nonoscillatory solutions and comparison theorems for oscillation.

本文主要讨论测度链上高阶时滞动力方程的渐近性、非振动解的存在性以及振动性的比较定理。

It consists mainly of seat plate, right and left side main magnets, double-layer repelling cavity comprising upper and lower magnets, front and back bending magnets, turntable shaft, turntable, magnetic bars and power output wheel.

它主要是由坐板，右、左侧板式主磁体，双层全排斥腔上、下部磁体及前后面折向磁体，转盘轴，转盘，多根条磁体，动力输出轮等组成。

In Chapter 2, the index theory of fixed points for mappings on the cone of the product Banach space is studied.

本文主要研究不动点指标理论及其在K型单调和竞争动力系统中的应用。

Secondly, the paper sets forth the dynamical mechanism, and points out the main barricade factors.

其次，分析了淄博市区域空间结构演变的动力机制，指出了淄博市区域空间结构演变的主要障碍因素。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。