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   1354篇
  免费   14篇
  国内免费   11篇
电工技术   9篇
综合类   34篇
化学工业   777篇
金属工艺   70篇
机械仪表   88篇
建筑科学   38篇
矿业工程   13篇
能源动力   7篇
轻工业   31篇
水利工程   3篇
石油天然气   11篇
武器工业   8篇
无线电   41篇
一般工业技术   205篇
冶金工业   22篇
原子能技术   2篇
自动化技术   20篇
  2023年   2篇
  2022年   3篇
  2021年   6篇
  2020年   15篇
  2019年   35篇
  2018年   17篇
  2017年   33篇
  2016年   36篇
  2015年   33篇
  2014年   26篇
  2013年   172篇
  2012年   36篇
  2011年   59篇
  2010年   36篇
  2009年   42篇
  2008年   47篇
  2007年   48篇
  2006年   52篇
  2005年   35篇
  2004年   57篇
  2003年   65篇
  2002年   53篇
  2001年   52篇
  2000年   53篇
  1999年   48篇
  1998年   31篇
  1997年   45篇
  1996年   65篇
  1995年   36篇
  1994年   66篇
  1993年   19篇
  1992年   7篇
  1991年   13篇
  1990年   5篇
  1989年   7篇
  1988年   2篇
  1987年   14篇
  1986年   6篇
  1985年   2篇
排序方式: 共有1379条查询结果,搜索用时 15 毫秒
1.
LED生产过程中的质量控制   总被引:2,自引:0,他引:2  
对LED封装过程可能出现的问题逐一指出,并提出解决的办法,着重介绍封装位置对LED发光亮度的影响。以期引起LED封装管理人员及工作人员的注意。  相似文献   
2.
介绍了一种不同于灌封材料,具有触变性,粘接性能优良,使用方便的固定电子分立元器件用胶粘剂E-4X。与国外同类产品Ep-433x胶粘剂对比,其综合性能优于Ep-433胶粘剂。  相似文献   
3.
本文提出了一种基于画圆算法的简单弧形贴图算法,并分析了该算法的可行性。  相似文献   
4.
RETARDATION AND REPAIR OF FATIGUE CRACKS BY ADHESIVE INFILTRATION   总被引:2,自引:0,他引:2  
Abstract— This paper presents results which demonstrate that polymeric filler materials, such as low-viscosity epoxies, can be vacuum-infiltrated into fatigue cracks in 7050 aluminium alloy to produce significant levels of fatigue crack retardation. It was found that the main test variable affecting the degree of retardation was the stress level at which the adhesive was introduced and cured. Two infiltrated adhesives were tested.
Infiltration at 0% (of the original) peak fatigue stress level produced negligible retardation, while infiltration at the 80% stress level produced about 300% increase in fatigue life for one adhesive and 3000% for the other adhesive. For the highest infiltration stress level both crack-face wedging and adhesion contributed initially to the retardation, but the adhesive component ceased after a crack grew through the adhesive to the original crack tip position. The results are discussed in terms of the applicability of the technique to highly-stressed aircraft components.  相似文献   
5.
自粘聚合物改性沥青防水卷材胶粘剂   总被引:2,自引:0,他引:2  
在SBS改性沥青防水卷材表面涂敷一层自粘性胶粘剂并以隔离纸覆盖,使用时撕掉隔离纸直接粘贴于屋面即可粘接密封牢,不但施工方便而且消除了熔融法施工造成的污染。该胶粘剂由沥青40%~65%,SBS 5%~30%,增粘剂2%~25%和助剂5%~25%构成。胶层具有可塑性、延展性,可自行填补屋面出现的裂缝,保证防水卷材的防水密封效果。  相似文献   
6.
The constrained blister test is investigated through finite element analysis to determine the applicabilities and the limitations of the new technique. Numerical results confirm that the strain energy release rate asymptotically approaches a constant value. These results also show that the test technique and the approximate solution for strain energy release rate are applicable for some practical cases.  相似文献   
7.
1低温聚合、快速结晶型氯了用胶氯丁橡胶的结晶度与反式1,4含量有关,而反式1,4含量又是由乳液聚合温度决定的,聚合温度越低,反式1,4含量越高。为了得到快速结晶型氯丁橡胶,聚合必须在较低温度下进行,一般不高于15℃。快速结晶型氯丁橡胶广泛用于鞋底的粘接、层压板的粘合、汽车装饰,以及其它多种用途。主要从引发剂、调节剂等几个方面改进氯丁橡胶的性能:2@基氯T橡胶。驻基氯丁胶是氯丁二烯和甲基丙烯酸的共聚物,是非结晶性,适用于室温硫化和耐热性用途。与快结晶型氯丁橡胶相比,由其配制的胶粘剂粘结强度形成更快,耐热性增…  相似文献   
8.
A method to obtain mechanical properties using a bonded (double) cantilever beam (or three point bend) specimen loaded in a manner to produce pure shear in the adhesive layer is reviewed. A revised mathematical solution which allows for easier interpretation of optimum beam dimensions to the one originally developed by Moussiaux, Cardon and Brinson for the static case is presented. An extension of this solution for a fixed/fixed viscoelastic beam under steady state oscillations developed by Li, Dickie and Morman is also discussed. Previous results using a vibrating beam to determine the complex viscoelastic properties of a bonded beam are reviewed. These results demonstrate conclusively that dynamic mechanical thermal analysis (DMTA) measurements discriminate differences in surface treatments and various environmental conditions. New measurements are presented that indicate the DMTA procedure can be used to quantify damage simulated by imbedded flaws in beams. The procedure is also shown to assess the effects of both humidity and corrosive environments on lap specimens. It is suggested that this technique may ultimately provide a method to quantify the amount of hidden damage in an adhesive joint subjected to fatigue, moisture or corrosive environments.  相似文献   
9.
叙述了XK908耐高温蒸煮胶粘剂的制备方法,主要反应条件对缩聚反应和扩链反应的影响,并对产品的应用效果与国外同类产品进行了比较  相似文献   
10.
A self-adhesive insulator is a component of a home appliance that is used to suppress vibration or prevent humidity affecting the internal parts of the appliance. There is a wide range of types and designs available, allowing them to be applied to areas having different shapes. At the design stage, once an insulator design has been developed sufficiently to identify its dimensions and features, the attaching time and baseline cost must be estimated with reasonable accuracy to enable a comparison of vendor quotes. However, the current estimation method is not sufficiently accurate in terms of the baseline cost. This paper presents a motion-based time-estimating scheme with which the time required for the attachment of such insulators can be calculated more accurately. The scheme has been developed by analyzing the motions needed to attach 350 insulators and then designating representative motions and their time values. For this purpose, a modular arrangement of predetermined time standards (MODAPTS) is adopted. Motion-based time-estimation method is useful in terms of simplicity and accuracy. It enables design engineers to estimate the time required for the attachment based only on a drawing of the insulator and a few MODAPTS rules. Estimates made with this method should vary from the actual value by no more than 9.5%.  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