全文获取类型
收费全文 | 403670篇 |
免费 | 4685篇 |
国内免费 | 1364篇 |
专业分类
电工技术 | 7565篇 |
综合类 | 316篇 |
化学工业 | 59812篇 |
金属工艺 | 16424篇 |
机械仪表 | 13489篇 |
建筑科学 | 8349篇 |
矿业工程 | 2154篇 |
能源动力 | 11534篇 |
轻工业 | 28450篇 |
水利工程 | 4266篇 |
石油天然气 | 7913篇 |
武器工业 | 17篇 |
无线电 | 49233篇 |
一般工业技术 | 82968篇 |
冶金工业 | 74954篇 |
原子能技术 | 9181篇 |
自动化技术 | 33094篇 |
出版年
2022年 | 2550篇 |
2021年 | 3883篇 |
2020年 | 2940篇 |
2019年 | 3802篇 |
2018年 | 6480篇 |
2017年 | 6475篇 |
2016年 | 6918篇 |
2015年 | 4317篇 |
2014年 | 7131篇 |
2013年 | 20024篇 |
2012年 | 11405篇 |
2011年 | 15263篇 |
2010年 | 12141篇 |
2009年 | 13709篇 |
2008年 | 14048篇 |
2007年 | 13810篇 |
2006年 | 12414篇 |
2005年 | 11111篇 |
2004年 | 10504篇 |
2003年 | 10416篇 |
2002年 | 9825篇 |
2001年 | 9732篇 |
2000年 | 9133篇 |
1999年 | 9521篇 |
1998年 | 24324篇 |
1997年 | 16708篇 |
1996年 | 12797篇 |
1995年 | 9516篇 |
1994年 | 8362篇 |
1993年 | 8379篇 |
1992年 | 6054篇 |
1991年 | 5694篇 |
1990年 | 5679篇 |
1989年 | 5317篇 |
1988年 | 5043篇 |
1987年 | 4419篇 |
1986年 | 4299篇 |
1985年 | 4812篇 |
1984年 | 4421篇 |
1983年 | 3994篇 |
1982年 | 3654篇 |
1981年 | 3730篇 |
1980年 | 3429篇 |
1979年 | 3326篇 |
1978年 | 3334篇 |
1977年 | 3750篇 |
1976年 | 4847篇 |
1975年 | 2850篇 |
1974年 | 2663篇 |
1973年 | 2730篇 |
排序方式: 共有10000条查询结果,搜索用时 22 毫秒
951.
952.
953.
954.
S Ando 《Canadian Metallurgical Quarterly》1995,59(12):2326-2327
The alpha- and gamma-tocopherol levels in the plasma of Japanese eel (Anguilla japonica) were 53.9 micrograms and 1.3 micrograms/ml of plasma, respectively. The alpha-tocopherol in the plasma was mainly distributed as very-low-density lipoprotein and low-density lipoprotein (LDL), while LDL and high-density lipoprotein constituted most of the gamma-tocopherol. A highly positive coefficient of correlation was observed between the alpha-tocopherol and lipoprotein contents in Japanese eel plasma. 相似文献
955.
U Kachintorn O Chinapak V Vongphanich C Kositchaiwat S Lekhayananda U Khow-ean C Suttinont V Saowaros N Kludchareon M Leethochawalit 《Canadian Metallurgical Quarterly》1995,78(12):641-647
BACKGROUND: Roxatidine acetate is a novel H2-receptor antagonist and several studies have shown that it is effective in healing duodenal ulcers. We evaluated the efficacy of roxatidine in a non-western society with particular different features and its healing of duodenal ulcers was compared in Thailand with that of ranitidine. METHOD: The design was controlled, randomized, double-blind, and multicenter. The study recruited a total of 215 patients who were endoscoped at the start of the trial and then randomized to receive a single capsule of roxatidine acetate, 150 mg, or an identical capsule containing ranitidine, 300 mg, both to be taken at night. Patients were evaluated at 1, 2, and 4 weeks, including endoscopy at the last session, as well as at 6 weeks with repeat endoscopy if the ulcer had not healed. RESULT: Both drugs relieved pain rapidly, usually within a week, and at repeat endoscopy at 4 weeks most ulcers (78%) were healed, 77.0 and 79.5 per cent in ranitidine and roxatidine, and in those patients in whom healing was not completed the healing rate had risen appreciably to 89.8 and 93.8 per cent respectively at 6 weeks. Small ulcers tended to heal quicker than larger ones, but smoking and alcohol intake had no negative effects on the results. CONCLUSION: The study was valid proof that roxatidine, in a single evening dose of 150 mg, was found to be both safe and effective in the rapid healing of duodenal ulcers when compared with 300 mg ranitidine. 相似文献
956.
S Clark 《Canadian Metallurgical Quarterly》1995,179(6):209-213
The elucidation of the chemical structure of lpriflavone was carried out by ultraviolet absorption spectrophotometric, infrared spectroscopic, 1H and 13C nuclear magnetic resonance spectroscopic, low and high resolution EI mass spectrometric, thermoanalytical, elemental analytical and X-ray diffraction methods. The results unambigously verify the structure of Ipriflavone. 相似文献
957.
An extensive Markov process, which considers both the coding redundancy and the intersample redundancy, is presented to measure the entropy value of an ECG signal more accurately. It utilizes the intersample correlations by predicting the incoming n samples based on the previous m samples which constitute an extensive Markov process state. Theories of the extensive Markov process and conventional n repeated applications of m-th order Markov process are studied first. After that, they are realized for ECG exact coding. Results show that a better performance can be achieved by the authors' system. The average code length for the extensive Markov system on the second difference signals was 2.512 b/sample, while the average Huffman code length for the second difference signals was 3.326 b/sample 相似文献
958.
Harame D.L. Comfort J.H. Cressler J.D. Crabbe E.F. Sun J.Y.-C. Meyerson B.S. Tice T. 《Electron Devices, IEEE Transactions on》1995,42(3):455-468
A detailed review of SiGe epitaxial base technology is presented, which chronicles the progression of research from materials deposition through device and integration demonstrations, culminating in the first SiGe integrated circuit application. In part I of this paper, the requirements and processes for high-quality SiGe film preparation are discussed, with emphasis on fundamental principles. A detailed overview of SiGe HBT device design and implications for circuit applications is then presented 相似文献
959.
Few studies have documented public perceptions of environmental health risks from exposure to overhead transmission lines. In particular, little information has been provided on the impact of worry on symptom prevalence in residents living adjacent to high voltage transmission lines. The current study assessed symptom prevalence and worry in 152 Orange County female residents living either adjacent to overhead transmission lines or one block away. Forty-five percent of the respondents were either very worried or somewhat worried about the transmission lines and 55% were slightly worried or not worried at all. Results indicated that for those who did not live on the easement level of worry did not affect the prevalence of health problems. For those who lived on the easement, the most worried respondents were more likely to report health problems. Disclosure of health problems may depend more on individuals' level of worry about rather than proximity to overhead transmission lines. Possible limitations of this study include personality variables such as hypochondriasis which were not assessed, recall bias, and social desirability. The homogeneity of subjects may also limit the generalizability of findings. 相似文献
960.
The authors review the principles of reconstructive surgery for lower limb salvage after severe lower limb trauma to determine factors that have been used as decision-making criteria for limb salvage or amputation in severe lower extremity injuries and the methods of reconstruction and their outcome. The use of scoring systems and their value in acute decision making (primary amputation or limb salvage) are described. Soft-tissue reconstructive techniques, with emphasis on the use of flaps and the importance of selecting the best technique and time for the reconstruction are reviewed. Skeletal reconstructive techniques are described, including available options and currently held views on indications and use of the best contemporary methods. It is essential for the physician to make a good initial decision on the need for primary amputation or limb salvage. A multidisciplinary approach is fundamental to successful salvage. 相似文献