全文获取类型
收费全文 | 1260篇 |
免费 | 68篇 |
国内免费 | 4篇 |
专业分类
电工技术 | 21篇 |
综合类 | 1篇 |
化学工业 | 211篇 |
金属工艺 | 46篇 |
机械仪表 | 27篇 |
建筑科学 | 65篇 |
矿业工程 | 11篇 |
能源动力 | 45篇 |
轻工业 | 134篇 |
水利工程 | 8篇 |
石油天然气 | 7篇 |
无线电 | 150篇 |
一般工业技术 | 189篇 |
冶金工业 | 156篇 |
原子能技术 | 20篇 |
自动化技术 | 241篇 |
出版年
2023年 | 16篇 |
2022年 | 8篇 |
2021年 | 24篇 |
2020年 | 18篇 |
2019年 | 22篇 |
2018年 | 27篇 |
2017年 | 33篇 |
2016年 | 37篇 |
2015年 | 30篇 |
2014年 | 35篇 |
2013年 | 91篇 |
2012年 | 55篇 |
2011年 | 83篇 |
2010年 | 48篇 |
2009年 | 70篇 |
2008年 | 78篇 |
2007年 | 57篇 |
2006年 | 65篇 |
2005年 | 52篇 |
2004年 | 37篇 |
2003年 | 29篇 |
2002年 | 29篇 |
2001年 | 26篇 |
2000年 | 21篇 |
1999年 | 23篇 |
1998年 | 33篇 |
1997年 | 26篇 |
1996年 | 10篇 |
1995年 | 12篇 |
1994年 | 14篇 |
1993年 | 24篇 |
1992年 | 12篇 |
1991年 | 9篇 |
1990年 | 11篇 |
1989年 | 15篇 |
1988年 | 6篇 |
1987年 | 10篇 |
1986年 | 5篇 |
1985年 | 10篇 |
1984年 | 13篇 |
1983年 | 11篇 |
1982年 | 14篇 |
1981年 | 11篇 |
1980年 | 8篇 |
1979年 | 14篇 |
1977年 | 3篇 |
1976年 | 7篇 |
1975年 | 8篇 |
1974年 | 7篇 |
1973年 | 5篇 |
排序方式: 共有1332条查询结果,搜索用时 15 毫秒
1.
2.
Joe Virginia 《电子产品世界》2006,(4):67-68
今天的液晶显示器(LCD)所达到的性能和图像质量在仅仅几年之前还是梦想,LCD显示器在几个相关的前沿领域不断发展.小型LCD体现得比其他任何领域都更为真切.手机行业的激烈竞争和螺旋式上升的用户需求正在驱动显示技术去满足融合的需要,即移动通信与移动计算和/或移动娱乐的融合. 相似文献
3.
J. L. Barron R. E. Mercer X. Chen P. Joe 《International journal of imaging systems and technology》2005,15(3):189-198
We present local least squares and regularization frameworks for computing 3D velocity (3D optical flow) from 3D radial velocity measured by a Doppler radar. We demonstrate the performance of our algorithms quantitatively on synthetic radial velocity data and qualitatively on real radial velocity data, obtained from the Doppler radar at Kurnell Radar station, Botany Bay, New South Wales, Australia. Radial velocity can be used to predict the future positions of storms in sequences of Doppler radar datasets.© 2005 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 15, 189–198, 2005 相似文献
4.
5.
This article reviews the steps necessary to configure and implement a complex router internetwork. This article will specifically concentrate on Cisco routers, and since they support Transmission Control Protocol/Internet Protocol (TCP/IP) natively, it will concentrate on a backbone network employing that protocol. 相似文献
6.
7.
Bromobenzene (800 mg/kg, ip) caused severe liver necrosis with massive hemorrhage in the golden Syrian hamster within the first 24 hr. Kidney injury was also observed. Treatment with N-acetylmethionine (NAM) at an ip dose of 1200 mg/kg at 5 hr after bromobenzene administration significantly protected the liver and kidney against injuries. Plasma glutamate pyruvate transaminase and blood urea nitrogen levels were substantially decreased in the NAM-treated animals. Histological evaluations confirmed these results. When the urinary neutral and phenolic metabolites of bromobenzene from NAM-treated and untreated hamsters were isolated and compared by GC and GC/MS, a striking result was observed in terms of O- and S-methylated thiol-containing metabolite formation. The NAM-treated animals showed approximately a 8- to 14-fold increase in the excretion of the four isomeric O- and S-methylated bromothiocatechols. These thiocatechols, which are now known to be the 3,4-series metabolites of bromobenzene, can undergo methylation at either the thiol or the hydroxyl functional group. The excretion of 3-S- and 4-S-methylated bromodihydrobenzene thiolols was also increased significantly in the NAM-treated hamster, but other neutral and phenolic metabolites were relatively unchanged. These results suggest that bromobenzene toxicity in the Syrian hamster may be associated with impaired methylation capabilities, an impairment that could be due to methionine and glutathione depletion. 相似文献
8.
Joe Sawicki 《电子产品世界》2006,(1):65
如果你考察我们试图用来获得应力模型或者类似模型的那些“邦迪”式(凑合)的方法,就会发现它可做不到有章可循。这就是为什么我们要花费更多的精力来试图确定需要何种模型,并判断哪种模型将为人们所接受。有待解决的最大的一个问题是,是否继续对器件的曲线来作假设,或者设法从一个确定性光刻的角度来推进问题的解决。EDA行业现在不再对模型采取消极的态度。现在,如果我们得不到所需要的东西,我们的过错将与模型的提供者一样严重。在研究90nm技术并迈向65nm节点的过程中,会出现两个层次上的信号完整性问题。在第一个层面上,你必须在数字域… 相似文献
9.
Gregorio Martinez Perez Antonio F. Gomez Skarmeta Steve Zeber Joe Spagnolo Tim Symchych 《Communications Magazine, IEEE》2006,44(11):58-64
This article reports the latest results of an R&D effort to develop a prototype implementation of a dynamic policy-based network management (PBNM) system that can be used to configure and manage a secure network for a coalition environment across an unsecured wide area network. The prototype, based on a distributed architecture, includes capabilities for policy creation and management, dynamic policy negotiation, and dynamic policy provisioning. The policy negotiation facilitates the rapid deployment of a coalition network while the dynamic policy provisioning automates the configuration and management of network services including firewalls, virtual private network connections, routing, quality of service (QoS), and domain name services. Such a PBNM system enhances an organization's ability to react to network incidents identified by a network situational awareness assessment. Although the focus of the current research is a military coalition environment, the system can be used in any distributed enterprise or collaborative environment 相似文献
10.
Blascovich Jim; Brennan Kelly; Tomaka Joe; Kelsey Robert M.; Hughes Pamela; Coad Mary Lou; Adlin Richard 《Canadian Metallurgical Quarterly》1992,63(1):164
Investigated in 3 experiments the relationships between affect intensity and basal, evoked, and perceived cardiac arousal. Affect intensity was assessed using R. J. Larsen and E. Diener's (1987) Affect Intensity Measure (AIM). Cardiac arousal was evoked with exercise in the 1st study and with mental arithmetic in the 2nd and 3rd. Perceived cardiac arousal was measured under optimal conditions using a standard heartbeat discrimination procedure. Women as a group scored higher on the AIM. Affect intensity was unrelated to basal or evoked cardiac arousal and was negatively related to perceived cardiac arousal in all 3 studies. Data suggest that affect intensity, although unrelated to actual physiological arousal, is negatively related to the accuracy with which individuals perceive their own arousal. Results are discussed within the context of an expanded arousal-regulation model (J. Blascovich, 1990). (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献