全文获取类型
收费全文 | 287604篇 |
免费 | 6265篇 |
国内免费 | 1474篇 |
专业分类
电工技术 | 5771篇 |
综合类 | 2089篇 |
化学工业 | 48086篇 |
金属工艺 | 10927篇 |
机械仪表 | 8938篇 |
建筑科学 | 7692篇 |
矿业工程 | 1901篇 |
能源动力 | 6510篇 |
轻工业 | 31591篇 |
水利工程 | 3184篇 |
石油天然气 | 5951篇 |
武器工业 | 174篇 |
无线电 | 28880篇 |
一般工业技术 | 50633篇 |
冶金工业 | 51386篇 |
原子能技术 | 6332篇 |
自动化技术 | 25298篇 |
出版年
2022年 | 2596篇 |
2021年 | 3821篇 |
2020年 | 2768篇 |
2019年 | 3204篇 |
2018年 | 4835篇 |
2017年 | 4929篇 |
2016年 | 5067篇 |
2015年 | 3823篇 |
2014年 | 6082篇 |
2013年 | 13120篇 |
2012年 | 9193篇 |
2011年 | 11784篇 |
2010年 | 9344篇 |
2009年 | 10001篇 |
2008年 | 10082篇 |
2007年 | 9983篇 |
2006年 | 8705篇 |
2005年 | 7637篇 |
2004年 | 7181篇 |
2003年 | 6708篇 |
2002年 | 6706篇 |
2001年 | 6404篇 |
2000年 | 6013篇 |
1999年 | 5863篇 |
1998年 | 14383篇 |
1997年 | 10101篇 |
1996年 | 7696篇 |
1995年 | 5885篇 |
1994年 | 5172篇 |
1993年 | 5109篇 |
1992年 | 3883篇 |
1991年 | 3656篇 |
1990年 | 3801篇 |
1989年 | 3652篇 |
1988年 | 3501篇 |
1987年 | 3035篇 |
1986年 | 3084篇 |
1985年 | 3541篇 |
1984年 | 3337篇 |
1983年 | 2977篇 |
1982年 | 2844篇 |
1981年 | 2937篇 |
1980年 | 2813篇 |
1979年 | 2698篇 |
1978年 | 2754篇 |
1977年 | 3069篇 |
1976年 | 4019篇 |
1975年 | 2438篇 |
1974年 | 2281篇 |
1973年 | 2416篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
Tolmachev A. M. Kuznetsova T. A. Fomenkov P. E. 《Protection of Metals and Physical Chemistry of Surfaces》2021,57(3):433-436
Protection of Metals and Physical Chemistry of Surfaces - The conditions for carrying out molecular dynamics calculations of adsorption isotherms of gases and vapors in micropores of active carbons... 相似文献
92.
Kozhitov L. V. Kiselev B. G. Raykova T. B. Popkova A. V. Kostishin V. G. Muratov D. G. Yakushko E. V. Kosushkin V. G. Bebenin V. G. 《Russian Microelectronics》2019,48(8):599-612
Russian Microelectronics - The recently developed nanomaterials and their production technologies as intellectual property objects (IPOs) are considered. The role of the informational-analytical... 相似文献
93.
Spiridonova E. A. Rotko V. O. Samonin V. V. Podvyaznikov M. L. 《Protection of Metals and Physical Chemistry of Surfaces》2021,57(1):45-51
Protection of Metals and Physical Chemistry of Surfaces - In this work, a universal sorbent has been obtained that works according to the mechanisms of chemisorption and adsorption by impregnating... 相似文献
94.
Dr. Alejandra A. Carriles Alberto Mills Dr. María-José Muñoz-Alonso Dr. Dolores Gutiérrez Dr. Juan M. Domínguez Prof. Dr. Juan A. Hermoso Prof. Dr. Federico Gago 《Chembiochem : a European journal of chemical biology》2021,22(2):374-391
Spontaneous mutations in the EEF1A2 gene cause epilepsy and severe neurological disabilities in children. The crystal structure of eEF1A2 protein purified from rabbit skeletal muscle reveals a post-translationally modified dimer that provides information about the sites of interaction with numerous binding partners, including itself, and maps these mutations onto the dimer and tetramer interfaces. The spatial locations of the side chain carboxylates of Glu301 and Glu374, to which phosphatidylethanolamine is uniquely attached via an amide bond, define the anchoring points of eEF1A2 to cellular membranes and interorganellar membrane contact sites. Additional bioinformatic and molecular modeling results provide novel structural insight into the demonstrated binding of eEF1A2 to SH3 domains, the common MAPK docking groove, filamentous actin, and phosphatidylinositol-4 kinase IIIβ. In this new light, the role of eEF1A2 as an ancient, multifaceted, and articulated G protein at the crossroads of autophagy, oncogenesis and viral replication appears very distant from the “canonical” one of delivering aminoacyl-tRNAs to the ribosome that has dominated the scene and much of the thinking for many decades. 相似文献
95.
Shamila Vibhushan Manuela Bratti Juan Eduardo Montero-Hernndez Alaa El Ghoneimi Marc Benhamou Nicolas Charles Eric Daugas Ulrich Blank 《International journal of molecular sciences》2021,22(1)
A sizable part (~2%) of the human genome encodes for proteases. They are involved in many physiological processes, such as development, reproduction and inflammation, but also play a role in pathology. Mast cells (MC) contain a variety of MC specific proteases, the expression of which may differ between various MC subtypes. Amongst these proteases, chymase represents up to 25% of the total proteins in the MC and is released from cytoplasmic granules upon activation. Once secreted, it cleaves the targets in the local tissue environment, but may also act in lymph nodes infiltrated by MC, or systemically, when reaching the circulation during an inflammatory response. MC have been recognized as important components in the development of kidney disease. Based on this observation, MC chymase has gained interest following the discovery that it contributes to the angiotensin-converting enzyme’s independent generation of angiotensin II, an important inflammatory mediator in the development of kidney disease. Hence, progress regarding its role has been made based on studies using inhibitors but also on mice deficient in MC protease 4 (mMCP-4), the functional murine counterpart of human chymase. In this review, we discuss the role and actions of chymase in kidney disease. While initially believed to contribute to pathogenesis, the accumulated data favor a more subtle view, indicating that chymase may also have beneficial actions. 相似文献
96.
Byakova O. V. Stepanov G. V. Vlasov A. O. Danylyuk V. E. Semenov N. V. Berezovs’kyi O. M. Gnyloskurenko S. V. 《Strength of Materials》2019,51(5):726-734
Strength of Materials - The paper addresses the investigation of high-strain rate compressive behavior of Al foams subjected to impact at the intermediate striking velocity ranged from 40 to... 相似文献
97.
Theoretical Foundations of Chemical Engineering - Using chemical and XRD phase analysis, along with electron microscopy, the hydrolytic processing of metallic bismuth into high-purity citrate has... 相似文献
98.
Russian Engineering Research - Improvement in the wear resistance of plunger-pump rods is considered. Hardening by high-frequency current is proposed. 相似文献
99.
100.