全文获取类型
收费全文 | 2579篇 |
免费 | 31篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 17篇 |
综合类 | 3篇 |
化学工业 | 152篇 |
金属工艺 | 16篇 |
机械仪表 | 58篇 |
建筑科学 | 42篇 |
能源动力 | 48篇 |
轻工业 | 65篇 |
水利工程 | 10篇 |
石油天然气 | 1篇 |
无线电 | 153篇 |
一般工业技术 | 221篇 |
冶金工业 | 1634篇 |
原子能技术 | 4篇 |
自动化技术 | 187篇 |
出版年
2023年 | 4篇 |
2022年 | 11篇 |
2021年 | 19篇 |
2020年 | 24篇 |
2019年 | 19篇 |
2018年 | 18篇 |
2017年 | 30篇 |
2016年 | 29篇 |
2015年 | 17篇 |
2014年 | 20篇 |
2013年 | 71篇 |
2012年 | 41篇 |
2011年 | 68篇 |
2010年 | 44篇 |
2009年 | 36篇 |
2008年 | 48篇 |
2007年 | 48篇 |
2006年 | 47篇 |
2005年 | 46篇 |
2004年 | 39篇 |
2003年 | 39篇 |
2002年 | 30篇 |
2001年 | 18篇 |
2000年 | 17篇 |
1999年 | 75篇 |
1998年 | 475篇 |
1997年 | 289篇 |
1996年 | 189篇 |
1995年 | 120篇 |
1994年 | 101篇 |
1993年 | 113篇 |
1992年 | 14篇 |
1991年 | 36篇 |
1990年 | 24篇 |
1989年 | 33篇 |
1988年 | 38篇 |
1987年 | 38篇 |
1986年 | 28篇 |
1985年 | 25篇 |
1984年 | 4篇 |
1983年 | 10篇 |
1982年 | 4篇 |
1981年 | 16篇 |
1980年 | 24篇 |
1978年 | 4篇 |
1977年 | 47篇 |
1976年 | 97篇 |
1975年 | 7篇 |
1974年 | 4篇 |
1973年 | 3篇 |
排序方式: 共有2611条查询结果,搜索用时 15 毫秒
1.
Husain Syed Sameed Ong Eng-Jon Bober Miroslaw 《International Journal of Computer Vision》2021,129(5):1432-1450
International Journal of Computer Vision - We propose a novel CNN architecture called ACTNET for robust instance image retrieval from large-scale datasets. Our key innovation is a learnable... 相似文献
2.
C Harro GL Braden AB Morris GS Lipkowitz RL Madden 《Canadian Metallurgical Quarterly》1997,24(5):955-957
Nontuberculous mycobacteria are increasingly recognized as important pathogens in peritonitis associated with continuous ambulatory peritoneal dialysis (CAPD). Mycobacterium gordonae rarely causes human infection and is the least likely mycobacterium to produce clinical infection in CAPD patients. We describe a patient with persistent M. gordonae peritonitis acquired while undergoing CAPD. During 18 months of treatment, clinical improvement occurred but a microbiological cure could not be achieved. Principles of therapy for mycobacterial peritonitis developing during CAPD are reviewed, and potential explanations for our patient's failure to respond to therapy are discussed. 相似文献
3.
GL Baum 《Canadian Metallurgical Quarterly》1996,334(21):1404; author reply 1404-1404; author reply 1405
4.
Molecular basis of hypoxia-induced erythropoietin expression 总被引:1,自引:0,他引:1
5.
M Valenti G Cimoli S Parodi GL Mariani M Venturini P Conte P Russo 《Canadian Metallurgical Quarterly》1993,(8):1157-1161
Synergism between recombinant human tumour necrosis factor (rHuTNF) and DNA topoisomerase II inhibitor VP16 during the killing of cells has been studied in six human ovarian cancer cell lines (A2774, A2780, SW626, IGROV-1, SKOV3, Pa1) and a cervical carcinoma cell line (Me180). Studies were performed using an assay of colony formation inhibition (drug treatment for 1 h) and a growth inhibition assay (continuous exposure for 20 h). Concomitant treatment of cells with VP16+rHuTNF enhanced cell killing in all the cell lines tested--an effect observed in both short- and long-term cytotoxicity assays. This study suggests that the activity of VP16 in ovarian cancer cell lines might be enhanced by rHuTNF in in vitro models. 相似文献
6.
Liang Y.C. Wenjiang Zeng Pick Hong Ong Zhaoxia Gao Jun Cai Balasubramanian N. 《Electron Device Letters, IEEE》2002,23(12):700-703
In this letter, a concise process technology is proposed for the first time to enable the fabrication of good quality three-dimensional (3-D) suspended radio frequency (RF) micro-inductors on bulk silicon, without utilizing the lithography process on sidewall and trench-bottom patterning. Samples were fabricated to demonstrate the applicability of the proposed process technology. 相似文献
7.
W. L. Siew F. C. H. Oh A. S. H. Ong 《Journal of the American Oil Chemists' Society》1985,62(6):1036-1039
Some of the factors affecting cloud point determination of palm oleins are described. These are the type of container used, method of stirring, rate of stirring and bath temperature. The repeatability and reproducibility standard deviations of the method are determined from collaborative trials. Recommendations for the test are made to reduce the large variations among laboratories. 相似文献
8.
The authors examine effects on the torque that simple variations of the standard rotor pole face profile could have, basically from an elementary viewpoint of how the modified profiles affect the distribution and magnitude of the radial and tangential components of the flux density. It is observed that the average torque is mostly affected by changes that alter the dominant radial component, such as changes in the effective air gap length. The other observation that an increase in the average torque can also be obtained by a favorable shift in the torque versus angle characteristics by relatively simple changes of the rotor pole profile is not so well known. Such a shift that reduces the slope of the torque angle characteristic, skewing the curve towards the unaligned position, has two advantages: one is that the phase inductance is at its maximum positive slop and, hence, the maximum torque, when the phase is energized; second, the flatter inductance profile near the aligned position when the phase current is to be commutated would allow a faster drop off of the commutated current and, thus, a smaller negative torque 相似文献
9.
10.
A deterministic digital simulation model with finite sum of properly weighted sinusoids is used to simulate a frequency nonselective mobile channel with LOS component. Measurement data are used to optimise the parameters. Which are then used in the deterministic simulation model. The probability distribution and level cross rate (LCR) obtained from the measured data agree well with the analytical and simulation results 相似文献