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Asynchronous Transfer Mode network gives the possibility to make B-ISDN design idea into the reality, so ATM eventually is r...

异步传输模式网络技术的出现为宽带综合业务数字网的实现提供了可能,并越来越成为它的关键技术。

With the development of automatic control and computer technology, the computer monitor and control technology of papermaking has become an important part of the comprehensive automatic control system.

随着自动控制和计算机技术的迅速发展,计算机监控技术已经是造纸综合自动化系统的一个重要的组成部分。

To accelerate the widespread of Synchronous Chip Seal and improve the operation quality of Synchronous Chipsealer, key techniques which influence the operation quality is studied detailedly, including the control of distributing quality, the dynamics characteristics of hydraulic system and the spray characteristics of asphalt nozzle of Synchronous Chipsealer.1 The factors which influence Synchronous Chip Seal quality are studied. Fiducial probability of simultaneous distribution density is advised to be used in evaluating the distribution bias and standard deviation of asphalt and aggregates simultaneously, which is more advanced than the single index evaluation method used before.2 The volume efficiency formula of asphalt pump is revised after analyzing the data of volume efficiency with mathematical statistics, which is helpful to match the asphalt spray system and control the flow out of asphalt pump accurately. With equation deduction and experiment, dynamic of hydraulic system used in Synchronous Chipsealer is studied, which lay the theory foundation on improving the stability and efficiency from design and controlling.4 Simulation on hydraulic system used in Synchronous Chipsealer is done with AMESim; the results indicate that multi-circle parallel connected hydraulic system with constant pressure power is better than that with load-sensing pressure power at present, because the latter will oscillate when the multi circles work at the same time. This conclusion has been proved during the debug of Synchronous Chipsealer.5 Asphalt nozzle characteristics, such as flat jet shape, flow distribution, are studied with experiment, the results indicate that cross quality of asphalt distributing is not increased linearly follow the increase of fan overlap level, the best point usually exists between two whole overlap level, asphalt distributing quality is better than±4% at the 2.5 overlap level, meets the superior specified in standard; The distribution quality of Synchronous Chipsealer can be increased by spray asphalt of different flow rang with nozzle of different diameter

为了加快同步碎石封层技术的推广,提高同步碎石封层设备的作业质量,本文对同步碎石封层设备作业质量的影响因素与控制方法、液压系统的动力学特性和沥青喷嘴的喷洒特性等关键技术进行了深入细致的研究:1研究了影响同步碎石封层作业质量的因素,提出了采用联合密度分布置信概率对同步碎石封层中沥青洒布量和碎石撒布量的系统偏差和标准差指标进行综合评价的方法,克服了传统评价方法只能对单一指标进行评价的缺陷;2采用数理统计的方法,研究了沥青泵的容积效率特性,修正了沥青泵容积效率公式,为沥青喷洒系统的匹配和沥青泵出口流量的精确控制提供了依据;采用数理方程推导与试验相结合的方法,研究了同步碎石封层设备液压系统的动力学特性,为从设计和控制的角度提高同步碎石封层设备液压系统的稳定性和效率奠定了理论基础;3运用AMESim软件对采用负载敏感控制和恒压控制的两种同步碎石封层设备液压系统进行仿真,结果表明:负载敏感控制的并联液压系统在多回路同时工作时,由于液压泵排量控制参考压力不稳定,容易引发液压系统振荡,恒压控制的并联液压系统是目前技术条件下比较理想的同步碎石封层设备工作装置驱动方案;该结论亦通过同步碎石封层设备装机试验得到了验证。4采用试验的方法对沥青喷嘴的喷洒特性进行了研究,结果表明:沥青洒布的横向精度并不是随着喷洒扇面重叠度的增加线性增加,其最高点通常出现在二个重叠度之间的"半重叠位置","2.5重叠"洒布时,沥青的横向洒布精度≤±4%,可以达到国家相关标准中的优级标准;同步碎石封层设备还可以根据不同洒布量情况下的流量需求,采用不同通径的喷嘴进行喷洒,提高沥青洒布精度。

Multipurpose use of marsh gas,an applied technology of marsh gas and its fermented products,helps fertilizer application to come to a frontier.

沼气综合利用就是指沼气及发酵的产物的应用技术,它把肥料技术的应用发展到一个新领域。

The theory of the system is combining formation of image and parallel white light projection. The system uses many edg measurement methods with subimage-element accuracy, and has many merits such as hige measurement accuracy, strong anti-interference function, intuitionistic measurement, convenient using and esay maintenance and so on. The repeatability of position measurement is below 0.1μm (0.05 pixel). EDG is used in practical machining of feedback stick, which is used in astronavigation industry.

在分析研究各种CCD工业检测技术基础上,研制了基于CCD和PC数字图像处理技术的反馈杆刚度检测系统,该系统采用成像法和平行白光投影法相结合的原理,综合运用了多种亚像素精度边缘检测方法,具有检测精度高、抗干扰能力强、检测直观、使用方便和易于维护等优点,其位置检测的重复精度可稳定在0.1μm(0.05像素)以内。

Quality predication of milk and its products was of...

文章介绍了近红外光谱技术的原理、优点以及在牛奶及其制品营养成分含量测定、质量评定、在线检测等方面的研究进展,综合阐述了近红外光谱技术在牛奶及其制品品质检测中的应用现状,并对其前景进行了展望。

Introduced application of project teaching method of Austrian vacational education in mold professional training,through described mold professional training how to carry out project teaching method ,explained important function that using project teaching method to raise students synthesizing capacity in the vocational-technical education.

介绍了在奥地利职业技术教育培训中项目教学法运用,通过详细地描述了模具专业实施项目教学的过程,说明了项目教学法的在职业技术教育中对培养学生综合能力的重要作用。

Experiments function is diversiform, the operation is simple, interface is friendly, correspondence method is diversiform, including the RS232, the RS485 and CAN nets. Putting forward serial port download method based on LF2407 .and providing good download flat for personnel ,who can download procedure that draw up oneself to the device.

基于DSP技术的多功能微机保护实验装置适应我国电力系统发展的需求,具有体积小、重量轻、精度高、运行可靠,可以用于电力系统对调度、运行、检修人员进行微机保护和变电站综合自动化技术的培训。

ITS extends over many new techniques and needs to solve a lot of problems of research and application.

它是一门新兴的多学科的综合技术,需要解决一系列的理论应用及相关技术。

This paper uses LCA system which is suitable to evaluate fibreboard products; it discusses on the basis of the LCA. It contains environment, economy and technology factors.

本文根据生命周期评价的技术框架,构建对我国现有的纤维板生产系统于环境效益、经济效益和技术性能等方面进行生命周期综合评价的模式。

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It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发,分析对称连杆曲线上鲍尔点的产生条件,提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品,年生产总值3000万美元,产品价廉物美、选料上乘、质量保证,深受国内外客户的青睐

The eˉtiology of hemospermia is complicate,but almost of hemospermia are benign.

血精的原因很,以良性病变为主。