查询词典 four-wheel drive

Lasers characteristic as a shock wave drive and the advantages of KrF laser are explained. Finally, the progress at home and abroad is enumerated.In chapter two, the basic principle of the EOS study is introduced. Specially, the impedance mismatch effect of the double-layer flyer is mentioned here. It is the primary theoretical basis of this paper.In chapter three, a one-dimension, three-temperature hydrodynamic code HYADES is introduced briefly. it is used to make a qualitative analysis about how the thickness of ablator affect the flyer velocities and stability.In chapter four, the experimental setup is described.

第一章为绪论部分，简要总结了状态方程研究的历史，激光作为冲击波驱动源的特点和KrF激光的优势，以及国内外的进展情况；第二章是本工作的理论基础，讨论了冲击波物理和雨贡纽曲线测量的基本原理和方法，重点介绍了激光飞片法的特点、关键要素和双层飞片的阻抗失配效应，鉴于KrF激光短波长和长脉宽的特点，我们拟对双层飞片的特性展丌研究工作，为实测状态方程做好准备；第三章简单介绍了一维三温流体力学数值模拟程序Hyades并运用它进行了若干状态方程实验的计算和设计，进行了烧蚀层厚度对飞片速度、稳定性的影响的定性分析；第四章是实验平台描述部分，介绍了光束平滑化技术，靶的制作，条纹相机的原理和使用，系统同步控制以及光学记录速度干涉仪系统的简单原理和构成。

Laser's characteristic as a shock wave drive and the advantages of KrF laser are explained. Finally, the progress at home and abroad is enumerated.In chapter two, the basic principle of the EOS study is introduced. Specially, the impedance mismatch effect of the double-layer flyer is mentioned here. It is the primary theoretical basis of this paper.In chapter three, a one-dimension, three-temperature hydrodynamic code HYADES is introduced briefly. it is used to make a qualitative analysis about how the thickness of ablator affect the flyer velocities and stability.In chapter four, the experimental setup is described.

第一章为绪论部分，简要总结了状态方程研究的历史，激光作为冲击波驱动源的特点和KrF激光的优势，以及国内外的进展情况；第二章是本工作的理论基础，讨论了冲击波物理和雨贡纽曲线测量的基本原理和方法，重点介绍了激光飞片法的特点、关键要素和双层飞片的阻抗失配效应，鉴于KrF激光短波长和长脉宽的特点，我们拟对双层飞片的特性展丌研究工作，为实测状态方程做好准备；第三章简单介绍了一维三温流体力学数值模拟程序Hyades并运用它进行了若干状态方程实验的计算和设计，进行了烧蚀层厚度对飞片速度、稳定性的影响的定性分析；第四章是实验平台描述部分，介绍了光束平滑化技术，靶的制作，条纹相机的原理和使用，系统同步控制以及光学记录速度干涉仪系统的简单原理和构成。

For the time being, POLAR CAP has four series of vehicle-specific products: weekend leisure, self-drive tour, camping equipment, extreme-sports equipment, which covers up to 100 products: electric appliances, tea sets, ice bags, picnic mat, luggage tightening nets/ropes, picnic bags, flashlights, tents, sleeping bags, alpenstock climbing ropes, etc.

目前极卡拥有周末休闲、自驾游、露营装备、极限装备四大系列产品，全线覆盖：车载电器、汽车茶具、汽车冰包、野餐垫、汽车行李拉紧网/绳、野餐包、电筒、帐篷、睡袋、登山杖、登山绳等上百种产品，畅销俄罗斯、新加坡、马来西亚、香港、台湾、尼泊尔、泰国、澳大利亚、西班牙等地。

Highland barley wine factory built in Luding County, Ganzi Prefecture, Sichuan-Tibet road is the only way to drive from Chengdu to the winery for about four hours.

桑吉卓玛青稞酒厂建在甘孜州泸定县境内，是川藏路必经之路，从成都开车到酒厂4小时左右。

Chapter four is suggestions to drive the domestic market into integration on the base of the analysis and current reality.

第四章是对推动我国国内市场一体化建设的建议。

Situated education which was founded by Li Jilin has evolved four characteristics of real form,deep affection,being conceived and implying truth inside,hackling four principles of implicational inducement,emotional drive,role transformation,psychological field integration and five elements to improve overall teaching quality and optimize educational circumstances,summarizing five realms of curriculum which are related and influential to student,knowledge and society.

李吉林创立的情境教育在理论建构上形成了&形真&、&情切&、&意远&、&理寓其中&等四个特点，梳理出了暗示诱导、情感驱动、角色转移、心理场整合等四大原理以及以全面提高教学质量、优化教育情境为目标的&五个要素&，概括了学生、知识、社会相互关联彼此影响的&五大课程领域&。在实践操作上，将情境分为实体、模拟、语表、想象及推理等&五大情境&。

After admeasured it, the pulse generated by microprocessor become the relevant four phase pulse. These pulses, which are magnified by driving circuit, are used to drive the four phase step motor.

由单片机产生的脉冲信号经过脉冲分配后分解出对应的四相脉冲，分解出的四相脉冲经驱动电路功率放大后驱动步进电机的转动。

The system of drive are all driven by stepping motors.the machine system design includes every free degrees,computation of drive and transmission system .the third and four degree of freedom are performed by the feed screw having the spline of ball bearing which is design specially for robot .with the textual study,it can be believe the user will have an overall understanding to the way of thinking and steps of the machine system.

在机械系统设计上，对每个自由度驱动、传动系统进行了计算与校核，其中第三四自由度有专为机器人设计的带滚珠花键的丝杠来实现。通过本文的学习，相信使用者会对它的机械系统设计的步骤和方法有一定的了解。关键词 SCARA机器人，谐波减速器，机械系统，丝杠

In this paper, the basic principle of the conventional slip energy recovery induction motor drive is discussed. Two kinds of slip energy recovery induction motor driving systems with high factors are discussed, and the performance analysis of these methods is compared. On the basis of above, a new type of three-phase and four-line slip energy recovering drive is proposed.

本文首先从普通串调原理入手，简要分析了影响串调系统功率因数的主要因素；在对三相四线双晶闸管串级调速、新型GTO串级调速等几种高功率方案进行分析与比较的基础上，提出了一种新型三相四线制双IGBT串级调速控制方案。

Firstly, the relationship between the magnetic pole state of active magnetic pole and the running state of passive magnetic pole was analyzed. The electromagnet's four magnetic pole state and switch sequence, which can drive permanent magnet rotate, were ascertained. Secondly, taking one of magnetic pole state NS (N denotes electromagnet's left magnetic pole and S right magnetic pole) as an example, the distribution of space magnetic field was studied. In addition, the mathematical model of space magnetic field was set up based on the magnetic circuit fundamental and using the method of magnetic analysis and modeling. Lastly, the four states' mathematical model of space magnetic field was solved by using the MATLAB.

首先，分析系统主动磁极磁极状态和从动磁极转动状态之间的关系，确定驱动永磁体转动的电磁体4个磁极状态及切换顺序；其次，基于磁路基本原理，通过磁场分析和建模，以电磁体4个磁极状态之一的NS（N表示其左极、S为右极）为例，对电磁体的空间磁场分布进行研究并建立空间磁场数学模型；最后，以MATLAB为平台对4个磁极状态的空间磁场数学模型进行求解，将求解结果与实验数据进行对比。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。