全文获取类型
收费全文 | 260082篇 |
免费 | 3193篇 |
国内免费 | 823篇 |
专业分类
电工技术 | 5130篇 |
综合类 | 330篇 |
化学工业 | 37231篇 |
金属工艺 | 10252篇 |
机械仪表 | 8487篇 |
建筑科学 | 6103篇 |
矿业工程 | 1076篇 |
能源动力 | 6390篇 |
轻工业 | 22852篇 |
水利工程 | 2561篇 |
石油天然气 | 3908篇 |
武器工业 | 68篇 |
无线电 | 34722篇 |
一般工业技术 | 50063篇 |
冶金工业 | 46534篇 |
原子能技术 | 5418篇 |
自动化技术 | 22973篇 |
出版年
2021年 | 2037篇 |
2019年 | 2033篇 |
2018年 | 3467篇 |
2017年 | 3533篇 |
2016年 | 3728篇 |
2015年 | 2323篇 |
2014年 | 4047篇 |
2013年 | 11284篇 |
2012年 | 6562篇 |
2011年 | 8876篇 |
2010年 | 6982篇 |
2009年 | 7850篇 |
2008年 | 8676篇 |
2007年 | 8615篇 |
2006年 | 7802篇 |
2005年 | 7139篇 |
2004年 | 6885篇 |
2003年 | 6731篇 |
2002年 | 6370篇 |
2001年 | 6469篇 |
2000年 | 6169篇 |
1999年 | 6252篇 |
1998年 | 14241篇 |
1997年 | 10271篇 |
1996年 | 8111篇 |
1995年 | 6411篇 |
1994年 | 5710篇 |
1993年 | 5581篇 |
1992年 | 4552篇 |
1991年 | 4211篇 |
1990年 | 4048篇 |
1989年 | 3779篇 |
1988年 | 3624篇 |
1987年 | 3170篇 |
1986年 | 3065篇 |
1985年 | 3612篇 |
1984年 | 3382篇 |
1983年 | 3032篇 |
1982年 | 2850篇 |
1981年 | 2952篇 |
1980年 | 2760篇 |
1979年 | 2648篇 |
1978年 | 2499篇 |
1977年 | 2945篇 |
1976年 | 3554篇 |
1975年 | 2318篇 |
1974年 | 2312篇 |
1973年 | 2320篇 |
1972年 | 1849篇 |
1971年 | 1745篇 |
排序方式: 共有10000条查询结果,搜索用时 8 毫秒
951.
952.
953.
T Rodriguez E Baumgarten R Fengler D Soumpasis G Henze 《Canadian Metallurgical Quarterly》1995,207(4):207-210
Nine children of the ALL-REZ BFM 87 and 90 trial received L-Asparginase (L-ASP) as a continuous infusion for 48-72 hs (i.e. 25 therapy cycles). Seven patients had had an allergic reaction towards an i.m. application (i.m., 29 therapy cycles). Two further patients got L-ASP initially as continuous infusion. The i.m. applications were carried out 19 times with Erwinia and 10 times with E. coli-Asparaginase, the continuous infusions 15 times with Erwinia and 10 times with E. coli-Asparaginase. In case of four patients continuous infusions of the same L-ASP type (E. coli or Erwinia) was well tolerated, after there had been an allergic reaction after i.m. application. Allergic reactions after i.m. application occurred during 10 courses as local painful erythema, during five courses as urticaria, during four courses as a general exanthema during one course as difficult breathing and during a further course as drop in blood pressure. After continuous infusion of L-ASP urticaria and difficult breathing occurred once and a transient exanthema two times. There was no anaphylactic reaction in any case. These data show that i.m. application of L-ASP causes no life-threatening side effects but allergic reactions (local pain and swelling) which clearly impaired general condition. Continuous infusion is a pharmacologically equivalent alternative with less impairment of the patients' general condition. 相似文献
954.
Bao X. Dhliwayo J. Heron N. Webb D.J. Jackson D.A. 《Lightwave Technology, Journal of》1995,13(7):1340-1348
Results are reported from recent research on the use of the Brillouin gain/loss mechanism for distributed sensing. A theoretical model of the interaction of the pulsed and CW beams is described and compared with experiments. Results from a system with a 51 km sensing length are presented. We finally investigate issues related to the variation within the sensing fiber of the polarizations of the two beams 相似文献
955.
Feng M. Scherrer D. Kruse J. Apostolakis P.J. Middleton J.R. 《Electron Device Letters, IEEE》1995,16(4):139-141
We present experimental evidence that the noise figure (NF) and associated gain equal to those achieved with GaAs pseudomorphic high electron mobility transistors (GaAs p-HEMT's) can also be accomplished by ion implanted GaAs metal-semiconductor field-effect transistors (GaAs MESFET's). These measured noise figure results as a function of low temperature for GaAs MESFET's and p-HEMT's clearly suggest that the transport properties of the two-dimensional electron gas in HEMT's and p-HEMT's do not make a significant contribution to the noise reduction at high frequency operation of these devices 相似文献
956.
This paper describes a soft switching active snubber for an IGBT operating in a single switch unity power factor three-phase diode rectifier. The soft switching snubber circuit provides zero-voltage turn-off for the main switch. The high turn-off losses of the IGBT due to current tailing are reduced by zero-voltage switching. This allows the circuit to be operated at very high switching frequencies with regulated DC output voltage, high quality input current and unity input power factor. Simulation and experimental results are included 相似文献
957.
958.
959.
Neoxanthin, a major carotenoid pigment of spinach, is found in the Chloroplast membrane and has an unknown function in plants. Neoxanthin inhibited the production of superoxide anions in an artificial xanthine and xanthine oxidase system and depressed DNA synthesis in methylcholanthrene (MCA)-initiated C3H10T1/2 fibroblasts. in two-stage carcinogenesis experiments, neoxanthin at 0.2 micrograms/0.2 ml inhibited the formation of tumors that were induced sequentially by 7,12-dimethylbenz[a]anthracene (DMBA) and 12-O-tetradecanoylphorbol-13-acetate (TPA) in the buccal pouch of Syrian Golden hamsters. To assess the ongoing process of carcinogenesis, the activity of ornithine decarboxylase (ODC), required for cell proliferation, was analyzed. Neoxanthin inhibited the activity of ODC when animals were treated with neoxanthin one hour before the application of TPA in two-stage carcinogenesis. However, neoxanthin did not inhibit ODC activity when animals were treated with neoxanthin one hour before the application of DMBA in two-stage carcinogenesis, and there was no subsequent tumor formation. In a short-term anti-initiation experiment, neoxanthin inhibited the covalent binding of isotope-labeled DMBA to DNA by 53%. These results indicate that neoxanthin inhibits the initiation stage and the promotion stage in two-stage carcinogenesis. This suggests that neoxanthin may act as a potential chemopreventive agent. 相似文献
960.