首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   79篇
  免费   15篇
  国内免费   5篇
电工技术   1篇
综合类   1篇
化学工业   5篇
金属工艺   13篇
机械仪表   24篇
建筑科学   1篇
能源动力   11篇
武器工业   1篇
无线电   2篇
一般工业技术   24篇
冶金工业   4篇
原子能技术   1篇
自动化技术   11篇
  2024年   2篇
  2023年   9篇
  2022年   5篇
  2021年   11篇
  2020年   20篇
  2019年   7篇
  2018年   2篇
  2017年   5篇
  2016年   4篇
  2015年   2篇
  2014年   2篇
  2013年   4篇
  2010年   3篇
  2009年   1篇
  2006年   2篇
  2004年   1篇
  2003年   1篇
  2002年   1篇
  2001年   3篇
  2000年   2篇
  1991年   1篇
  1989年   1篇
  1987年   2篇
  1986年   5篇
  1981年   1篇
  1980年   1篇
  1979年   1篇
排序方式: 共有99条查询结果,搜索用时 15 毫秒
1.
《Wear》1986,113(3):331-352
It is shown that cylinders can wear against each other or against flats in only a very few ways, each of which can be defined geometrically. For each geometry the volume of any intersection varies with a few easily measured dimensions. When dealing with a wear scar on a tube it is relatively easy to relate the volume already lost as a fraction of the volume that must be removed before any particular depth is reached. The results are presented graphically so that calculations can be reduced to a minimum and the results made as widely applicable as possible.The methods developed here have already been employed to predict the lifetimes of irreplaceable tubes showing wear scars. Amongst other possible uses of these methods, one discussed in this paper is a better way of calculating specific wear rates in wear testing using crossed cylinder geometries.  相似文献   
2.
The cooperative output regulation problem has been studied by two approaches: the distributed observer (DO) approach and the distributed internal model (DIM) approach, respectively. Each of these two approaches has its own merits and weaknesses. Recently, we presented an overview on the cooperative output regulation problem by the DO approach. This paper further surveys the cooperative output regulation problem by the DIM approach. We first summarize the constructions and the roles of two different versions of the internal models: the distributed p-copy internal model and the distributed canonical internal model. Then, we describe an integrated framework that combines the DO approach and the DIM approach. Extensions and variants of the DIM and their applications will also be highlighted.  相似文献   
3.
多孔储液介质是启发自关节软骨的仿生摩擦材料,因具有良好的自润滑性能,在工业生产中发挥着重要作用。早期多孔储液介质多是针对不同基体材料及骨架结构进行优化设计,或是根据单因素理想边界建立润滑数值模型,对多孔储液介质的润滑机理缺乏系统的理论描述,限制了其大规模的工业应用。根据不同的结构形式和润滑机理,将多孔储液介质分为有限直孔储液介质和随机多孔储液介质,总结了有限直孔储液介质中空化现象、流体运动、惯性效应、气-液耦合对润滑性能的影响,论述了基于渗流力学、流-固耦合作用的随机多孔储液介质自润滑理论的发展,以及多孔储液介质的应用现状。分析和讨论了多孔储液介质自润滑机理研究的难点问题,对推动多孔储液介质润滑机理的研究和工程实践应用具有重要的参考意义。  相似文献   
4.
In this paper, the complex number method is applied to the dimensional synthesis of planar triads, for six precision positions, and motion generation with prescribed timing. A triad is a series of three binary links which can be part of many linkages. The solution for the displacement equation of the triad is developed through the use of compatibility equations. An interactive computer program which allows the user to find an appropriate triad from the Triad-Burmester curves for a specified motion is outlined. A numerical example to show the application of the triad program to the dimensional synthesis of an eight-bar linkage is included.  相似文献   
5.
采用OM、SEM、硬度测试、摩擦磨损试验等方法研究了QPQ技术中渗氮时间对合金铸铁组织与摩擦性能的影响。结果表明,QPQ处理后,合金铸铁表面形成的渗层物相主要由Fe2-3N、Fe2O3和FeO组成。渗层厚度的平方与渗氮时间存在线性关系,在580 ℃渗氮盐浴条件下,氮元素在合金铸铁中的扩散激活能为70.07 kJ/mol。在90~150 min渗氮时间内,随着渗氮时间延长,渗层的表面硬度值由522 HV0.05降低至441 HV0.05,当渗氮时间延长至180 min,表面硬度值回升至455 HV0.05。与未处理试样相比,QPQ处理的试样具有更小的摩擦因数,并且QPQ处理后试样表面的犁沟显著变浅,表面的金属剥落也得到明显改善,且随着渗氮时间的增加,渗层厚度增加且稳定材料。经180 min渗氮处理的QPQ试样具有最优综合性能,表面硬度值为455 HV0.05,摩擦因数为0.32。  相似文献   
6.
赵仕宇  周超  詹艳然 《表面技术》2020,49(10):346-352
目的 以圆锥台成形件为例,基于粗糙表面的区域支承率曲线,进行了用功能参数表征表面几何形貌的研究,以全面、准确、定量地表征渐进成形件的表面质量,预测表面性能。方法 用渐进成形工艺加工成形角分别为35°、45°和55°的圆锥台件,将各圆锥台的成形面分为顶部、中部和底部三个区域,并使用三维表面轮廓仪,在上述三个区域中随机测量各4个样本。根据ISO 25178-2:2012,将各样本表面的区域支承率曲线分为峰区、核心区和谷区,选用部分功能参数——核心区高度Sk、峰区材料体积Vmp、核心区材料体积Vmc和谷区空隙体积Vvv表征表面,并与常用的高度表征参数——Sa、Sq、Ssk和Sku进行比较。结果 成形件表面的Ssk和Sku的计算值极不稳定,变异系数(标准偏差与均值之比)最高值分别可达127.67%和39.11%,Sa、Sq的最大变异系数分别为4.41%和4.26%,虽然它们的参数计算值较为稳定,但常无法体现表面形貌的实际差异。功能参数独立表征不同功能区,Sk和Vmc的最大变异系数分别为9.32%和7.73%,说明同一表面各处,在长期工作阶段具有较为一致的表面性能,Vmp和Vvv的最大变异系数分别为60.53%和31.25%,说明表面各处峰、谷区的形貌有所不同,因而在磨合时间、磨粒存储等方面会有不同的表现。结论 粗糙表面的三维本质要求用三维表征参数才能全面表征其几何形貌。高度参数虽然计算简单,但常难以解读它们的物理意义,无法定量评价表面性能;功能参数具有明确的物理意义,可为表征表面质量、预测表面性能提供定量、实用的方法。  相似文献   
7.
By integrating organic parts achieved through evolution and inorganic parts developed by human civilisation, the cyborg microrobot is rising by taking advantage of the high flexibility, outstanding energy efficiency, extremely exquisite structure in the natural components and the fine upgradability, nice controllability in the artefact parts. Compared to the purely synthetic microrobots, the cyborg microrobots, due to the exceptional biocompatibility and biodegradability, have already been utilised in in situ diagnosis, precise therapy and other biomedical applications. In this review, through a thorough summary of recent advances of cyborg microrobots, the authors categorise the cyborg microrobots into four major classes according to the configuration between biomaterials and artefact materials, i.e. microrobots integrated inside living cell, microrobots modified with biological debris, microrobots integrated with single cell and microrobots incorporated with multiple cells. Cyborg microrobots with the four types of configurations are introduced and summarised with the combination approaches, actuation mechanisms, applications and challenges one by one. Moreover, they conduct a comparison among the four different cyborg microrobots to guide the actuation force promotion, locomotion control refinement and future applications. Finally, conclusions and future outlook of the development and potential applications of the cyborg microrobots are discussed.Inspec keywords: medical robotics, cellular biophysics, mobile robots, molecular biophysics, polymers, microrobotsOther keywords: locomotion control refinement, actuation force promotion, combination approaches, biological debris, living cell, artefact materials, biomaterials, biomedical applications, biodegradability, exceptional biocompatibility, natural components, energy efficiency, human civilisation, purely synthetic microrobots, cyborg microrobot  相似文献   
8.
雷荣华  陈力 《控制与决策》2020,35(8):1833-1840
针对执行器发生部分失效故障的空间机器人,提出一种基于比例因子识别的自校正反馈神经网络容错算法.首先,针对无故障系统设计一种常规的神经网络控制算法;然后,利用比例因子观测器对真实的比例因子进行识别;最后,将该神经网络控制算法与识别的比例因子相结合,得到一种具有容错功能的自校正反馈神经网络控制算法.控制器与观测器的稳定性判据均由Lyapunov函数法严格给出,并通过数值仿真表明所提出控制策略的可行性.  相似文献   
9.
《Acta Metallurgica》1986,34(4):713-720
A TEM study of the interphase boundary structure of 9R orthorhombic α1' martensite formed in β′ CuZn alloys shows that it consists of a single array of dislocations with Burgers vector parallel to 〈110〉β′ and spaced about 3.5 nm apart. This Burgers vector lies out of the interface plane; hence the interface dislocations are glissile. Unexpectedly, though, the Burgers vectors of these dislocations are not parallel when referenced to the matrix and the martensite lattices. This finding is rationalized on published hard sphere models as a consequence of relaxation of a resultant of the Bain strain and lattice invariant shear displacements within the matrix phase.  相似文献   
10.
Doherty, J. F., and Hsieh, Y.-T., A Constrained Block Iterative Algorithm for Multiple-Access Interference Suppression, Digital Signal Processing12 (2002) 12–20An interference suppression scheme using a block iterative, row-action projection (RAP) algorithm for direct-sequence spread-spectrum (DS/SS) code-division multiple-access (CDMA) systems is presented. The performance results for the near–far multiple-access interference scenario using the RAP algorithm are compared with a normalized least mean square (NLMS) algorithm. It is shown that the CDMA receiver employing the RAP algorithm has a faster convergence rate and a lower steady-state bit error rate compared to the receiver employing the NLMS algorithm.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号