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   1005篇
  免费   46篇
  国内免费   137篇
电工技术   41篇
综合类   94篇
化学工业   143篇
金属工艺   75篇
机械仪表   56篇
建筑科学   35篇
矿业工程   13篇
能源动力   13篇
轻工业   51篇
水利工程   26篇
石油天然气   40篇
无线电   150篇
一般工业技术   256篇
冶金工业   43篇
原子能技术   50篇
自动化技术   102篇
  2024年   35篇
  2023年   85篇
  2022年   88篇
  2021年   87篇
  2020年   33篇
  2019年   23篇
  2018年   30篇
  2017年   17篇
  2016年   21篇
  2015年   33篇
  2014年   23篇
  2013年   24篇
  2012年   77篇
  2011年   88篇
  2010年   21篇
  2009年   29篇
  2008年   69篇
  2007年   61篇
  2006年   63篇
  2005年   57篇
  2004年   32篇
  2003年   23篇
  2002年   9篇
  2001年   14篇
  2000年   27篇
  1999年   20篇
  1998年   14篇
  1997年   22篇
  1996年   12篇
  1995年   15篇
  1994年   8篇
  1993年   3篇
  1992年   2篇
  1991年   7篇
  1990年   2篇
  1989年   1篇
  1988年   4篇
  1987年   4篇
  1982年   4篇
  1959年   1篇
排序方式: 共有1188条查询结果,搜索用时 31 毫秒
1.
通过正则变换和幺正变换的方法研究了有互感和电源存在的情况下的介观电容耦合电路的量子涨落。结果表明电荷和电流的量子涨落与电源无关。当电路元件确定时,如果L1/L2的值很大或很小,耦合对涨落的影响很大。互感从有到无的过程中,回路1中电流的涨落和回路中2中电荷的涨落有明显的变化。换句话说,互感的有无对涨落的大小起着举足轻重的作用。  相似文献   
2.
1 IntroductionThestickingpointofassociationrulealgorithmsdependsoneffectivelyfindingallcorrelationpatternsthatsatisfyvaluerequirementinthemagnanimityofdata.Butthealgorithmsalsobringanegativeef fect:thenumberofassociationrulesisverylarge.Alsoinformation…  相似文献   
3.
The Research of ST-OFDM in Physical Layer of IEEE 802.16a   总被引:1,自引:0,他引:1  
This paper briefly introduces one of the three physical layer implementations of IEEE 802.16a~[1],WirelessMAN-OFDM PHY.Based on the implementation,the combination of Orthogonal Frequency Division Multiplexing(OFDM)and Space-Time Coding(STC)which is briefly called ST-OFDM in IEEE 802.16a,is investigated under thechannel provided in Ref.[2].Especially,this paper is focused on the influence of the optimal decision threshold on the sys-tern Bit-Error-Rate(BER)performance based on unequal probabilities of sources.The simulations show that when Signal-Noise-Ratio(SNR)is low the optimal decision threshold is obviously superior to the usual one;when SNR is high to someextent,such as 10 dB for 4QAM and 16 dB for 16QAM,we can use the usual decision threshold instead of the optimal  相似文献   
4.
We present a visual analytics system to understand the operation data of a company, GAStech, from IEEE VAST Challenge 2016. The data include proximity data recording the locations and movements of employees, and heating, ventilation, and air conditioning (HVAC) data recording the environmental conditions in the building. Analyzing the data to detect the suspicious behaviors of some disgruntled employees is of special interest. Our system provides coordinated multiple views to visualize the proximity data and the HVAC data over time. Visual hints and comparisons are designed for users to identify abnormal patterns and compare them. Furthermore, the system automatically detects and correlates the anomalies in the data. We provide use cases to demonstrate the effectiveness of our system.  相似文献   
5.
提出一个传送未知团簇态的方案.在这个方案中,传送者利用一个非最大的三粒子纠缠态和一个非最大的四粒子纠缠态作为量子通道,当接收者执行适当的幺正操作时,可以以一定的概率完成未知团簇态的量子隐形传送.  相似文献   
6.
The corrosion behavior and mechanism of hot-dip galvanized steel and interstitial-free (IF) substrate with alkaline mud adhesion were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), and linear polarization. The results show that non-uniform corrosion occurs on the galvanized steel and IF substrate during 250 h with the mud adhesion. The corrosion products on the galvanized steel are very loose and porous, which are mainly ZnO, Zn5(OH...  相似文献   
7.
介绍建筑涂料水性化。从五十年代至今发展的必然性和存在的优势是显而易见。但其产品品种单一,质量不尽人意,其中存在一哄而上,技术实力不一等问题,而在我们涂料工业中却未能引起重视。建筑涂料水性化既为发展方向,必由我们涂料工业担当此任,为未来发展应发挥主力军作用。  相似文献   
8.
An accurate chlorine bulk decay model is needed to ensure that potable water meets the microbial and the chemical safeties at the treatment plant and throughout the distribution. Among the mathematical models available,the general second-order chlorine bulk decay model( GBDM) is the most fundamentally sound.Application of the GBDM,however,has been hindered by its numerous fictive parameters and lack of an analytical solution. This theoretical work removes the two obstacles. The GBDM is solved through transformation and integration. The analytical solution provides deep insights into the GBDM and facilitates the parameterization and sensitivity analysis. The background natural organic matter( NOM) is characterized with the probabilistic distribution of functional groups. It reveals that the mean of the function group distribution is correlated with the initial chlorine decay rate coefficient( κ_0). A simple formula is developed to determine κ_0 directly from the initial chlorine decay. The theoretical treatment reduces the fictive parameters to a minimum. For the common lognormal distribution,the GBDM needs only three parameters,well defined as initial chlorine demand X_0,median rate coefficient km,and heterogeneity index σ. For more complicated scenarios,composite distributions are constructed through superposition of individual distributions. A highlighted example is to predict chlorine decay in blends of different waters. With the theoretical and mathematical advancement here,the GBDM can be applied effectively to any reactive background matter in any reaction systems.  相似文献   
9.
To study the configuration and conductivity effects on micro?scale methane?air flames by electric field and iron wind, different electric field forces and iron winds are generated by needle, circle and...  相似文献   
10.
FeMoAlCOATINGANDITSHIGHTEMPERATURESULFIDATIONPROPERTIES①LiFang,HeYedong,QiHuibin,HuangZhenzhong,ZhuRizhangBeijingCorosionand...  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