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   94135篇
  免费   7894篇
  国内免费   4082篇
电工技术   5737篇
技术理论   2篇
综合类   5758篇
化学工业   14763篇
金属工艺   5040篇
机械仪表   5360篇
建筑科学   6793篇
矿业工程   1826篇
能源动力   2815篇
轻工业   7150篇
水利工程   1808篇
石油天然气   3822篇
武器工业   674篇
无线电   12725篇
一般工业技术   12377篇
冶金工业   4944篇
原子能技术   1054篇
自动化技术   13463篇
  2024年   310篇
  2023年   1304篇
  2022年   2598篇
  2021年   3625篇
  2020年   2466篇
  2019年   2108篇
  2018年   2376篇
  2017年   2773篇
  2016年   2487篇
  2015年   3432篇
  2014年   4514篇
  2013年   5983篇
  2012年   6249篇
  2011年   7035篇
  2010年   6091篇
  2009年   5937篇
  2008年   5820篇
  2007年   5553篇
  2006年   5292篇
  2005年   4322篇
  2004年   2980篇
  2003年   2481篇
  2002年   2479篇
  2001年   2118篇
  2000年   1985篇
  1999年   2027篇
  1998年   2004篇
  1997年   1694篇
  1996年   1520篇
  1995年   1256篇
  1994年   1008篇
  1993年   838篇
  1992年   657篇
  1991年   493篇
  1990年   414篇
  1989年   332篇
  1988年   285篇
  1987年   195篇
  1986年   167篇
  1985年   148篇
  1984年   109篇
  1983年   77篇
  1982年   82篇
  1981年   63篇
  1980年   59篇
  1979年   55篇
  1978年   43篇
  1977年   43篇
  1976年   63篇
  1973年   30篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
131.
Anandamide, an endogenous ligand for central cannabinoid receptors, is released from neurons on depolarization and rapidly inactivated. Anandamide inactivation is not completely understood, but it may occur by transport into cells or by enzymatic hydrolysis. The compound N-(4-hydroxyphenyl)arachidonylamide (AM404) was shown to inhibit high-affinity anandamide accumulation in rat neurons and astrocytes in vitro, an indication that this accumulation resulted from carrier-mediated transport. Although AM404 did not activate cannabinoid receptors or inhibit anandamide hydrolysis, it enhanced receptor-mediated anandamide responses in vitro and in vivo. The data indicate that carrier-mediated transport may be essential for termination of the biological effects of anandamide, and may represent a potential drug target.  相似文献   
132.
Coplanar waveguide-fed uniplanar bow-tie antenna   总被引:3,自引:0,他引:3  
The design of coplanar waveguide (CPW)-fed bow-tie antenna for the 2.4-GHz ISM band is described. A coplanar waveguide-to-coplanar strips (CPW-to-CPS) balun is used to obtain the balanced feed line for the printed bow-tie. An analysis method based on the mixed potential integral equation method is used to characterize the input characteristics of the bow-tie antenna. The numerical results obtained are in good agreement with the experimental data. Through experiments with bow-tie antennas of various extended angles, the bow-tie antenna with a 90° extended angle exhibits the widest bandwidth in the desired frequency band which has a bandwidth of 17% for a VSWR <1.5:1  相似文献   
133.
Color image retrieval based on hidden Markov models   总被引:1,自引:0,他引:1  
In this correspondence, a new approach to retrieving images from a color image database is proposed. Each image in the database is represented by a two-dimensional pseudo-hidden Markov model (2-D PHMM), which characterizes the chromatic and spatial information about the image. In addition, a flexible pictorial querying method is used, by which users can paint the rough content of the desired images in a query picture. Image matching is achieved by comparing the query picture with each 2-D PHMM in the database. Experimental results show that the proposed approach is indeed effective.  相似文献   
134.
BACKGROUND: To determine the best cutoff values of aspartate aminotransferase (AST) and alanine amino-transferase (ALT) in detecting viral hepatitis C infection among patients of continuous ambulatory peritoneal dialysis (CAPD). METHODS: 90 (44 male and 46 female) CAPD patients and 526 adult controls (266 male, 260 female) were enrolled. Serum AST and ALT were measured by an auto-analyser monthly. Serum HBsAg was examined using a RIA method and anti-HCV by an second-generation EIA method. The best cutoff values of AST and ALT for detecting viral hepatitis were obtained from the ROC (receiver-operating characteristic) curve. RESULTS: The prevalence of anti-HCV(+) was significantly higher in CAPD patients (16.7%) than in normal controls (4.9%), while that of HBsAg(+) was similar in both groups. CAPD patients had significantly lower levels of serum aminotransferases compared to normal controls. Mean AST were 23.8 IU/l in normal control and 18.8 IU/l in the CAPD patients (P < 0.001). Mean ALT were 21.9 IU/l in normal controls and 15.3 IU/l in the CAPD patients (P < 0.001). CAPD patients with HCV infection had higher serum AST and ALT levels than those without. However, HBV infection did not cause significant serum aminotransferase elevation in patients. The conventional cutoff values of AST (40 IU/l) and ALT (40 IU/l) for detecting viral hepatitis yielded only a sensitivity of 27.3 and 18.2% respectively; on the contrary, our revised cutoff values of AST (24 IU/l) and ALT (17 IU/l) had better sensitivities (AST, 72.7%; ALT, 63.6%). For serial aminotransferase values, the sensitivity of AST and ALT for detecting HCV were 36.4 and 27.3% by conventional criteria, and were both 81.8%, by our newly revised criteria. CONCLUSIONS: Serum aminotransferase cutoff values should be modified for screening viral hepatitis in a CAPD population. Our new cutoff criteria had important clinical implications in providing benefits of earlier detection and possible prevention from chronic hepatic deteriorations.  相似文献   
135.
Identifies the basic technological components of multimedia communications. Among these technologies, multimedia processing and transmission already benefit heavily from VLSI advances. in fact, these two technologies could not have matured without special-purpose VLSI chips. We have examined basic processing required in these technologies and some VLSI architectures. The focus has been on standard-compliant VLSI chips, because the eventual goal of communications is to allow everyone to reach others without constraints. There are still a number of evolving standards, which means that we might witness yet another wave of VLSI chips for multimedia communications  相似文献   
136.
本文用计算机数字模拟方法研究了电活性分子多层Z型L-B膜修饰电极的循环伏安行为。计算了电极与修饰L-B膜分子第一层之间的电荷转移速度常数K_o,L-B膜分子层间的电荷转移速度常数k_i;对峰电位差△E_p及阳极峰面积Q的影响,以及在不同条件下各层分子的氧化态分数随扫描时间的变化。为研究和设计电活性分子修饰电极的实际体系提供了大量数据和信息。  相似文献   
137.
演绎数据库管理系统DEDBMS是工程数据库管理系统EDBMS/2中的一个子系统。本文着重介绍其产生式语言用户界面、工作流程及功能特点。DEDBMS系统的开发,使EDBMS/2不仅具有工程数据据管理功能,而且具有数据演绎和知识处理能力,从而成为CAD/CAM系统集成化和智能化的有力支撑工具。  相似文献   
138.
本文提出新型布线算法,集李氏迷宫法与线搜索法的长处为一体,以饱和带法进行动态排序,以线搜索法确定借孔位置,然后用李氏法进行单层布线,获得最佳路径,从而达到线型好,布通率高的效果。  相似文献   
139.
根据冬小麦和土壤地面反射波谱测试数据,计算了在卫星高度上与卫星磁带数据相对应波段的辐亮度值,对NOAAAVHRR和TM某些通道的差值绿度植被指数DVI、归一化绿度植被指数NDVI和比值绿度植被指数RVI的分析,从理论上证明了目前采用TMDVI_(4,3)提取冬小麦种植面积和NOAANDVI_(2,1)区分植被和土壤背景的有效性。同时在冬小麦种植面积和长势监测方面提出了一些新建议。  相似文献   
140.
本文提出了一种独特的编译错误处理方法,其特点是将错误信息组成一个独立的文件。  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