全文获取类型
收费全文 | 1540226篇 |
免费 | 29928篇 |
国内免费 | 8057篇 |
专业分类
电工技术 | 35854篇 |
技术理论 | 1篇 |
综合类 | 7924篇 |
化学工业 | 275794篇 |
金属工艺 | 65940篇 |
机械仪表 | 44136篇 |
建筑科学 | 48225篇 |
矿业工程 | 12249篇 |
能源动力 | 51072篇 |
轻工业 | 113933篇 |
水利工程 | 15839篇 |
石油天然气 | 38920篇 |
武器工业 | 353篇 |
无线电 | 199479篇 |
一般工业技术 | 287449篇 |
冶金工业 | 174014篇 |
原子能技术 | 34393篇 |
自动化技术 | 172636篇 |
出版年
2021年 | 16831篇 |
2020年 | 12834篇 |
2019年 | 15371篇 |
2018年 | 16682篇 |
2017年 | 16187篇 |
2016年 | 22292篇 |
2015年 | 18503篇 |
2014年 | 29987篇 |
2013年 | 89621篇 |
2012年 | 36870篇 |
2011年 | 49626篇 |
2010年 | 44158篇 |
2009年 | 52424篇 |
2008年 | 46026篇 |
2007年 | 43177篇 |
2006年 | 45737篇 |
2005年 | 40565篇 |
2004年 | 42083篇 |
2003年 | 41827篇 |
2002年 | 40909篇 |
2001年 | 37860篇 |
2000年 | 36224篇 |
1999年 | 35671篇 |
1998年 | 48301篇 |
1997年 | 41367篇 |
1996年 | 37079篇 |
1995年 | 31812篇 |
1994年 | 29658篇 |
1993年 | 29461篇 |
1992年 | 26445篇 |
1991年 | 23570篇 |
1990年 | 23894篇 |
1989年 | 22984篇 |
1988年 | 21459篇 |
1987年 | 19604篇 |
1986年 | 18984篇 |
1985年 | 22281篇 |
1984年 | 22402篇 |
1983年 | 20357篇 |
1982年 | 19360篇 |
1981年 | 19481篇 |
1980年 | 18074篇 |
1979年 | 18540篇 |
1978年 | 17840篇 |
1977年 | 17732篇 |
1976年 | 18945篇 |
1975年 | 16068篇 |
1974年 | 15508篇 |
1973年 | 15609篇 |
1972年 | 13094篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
891.
Alfredo M. Gravagnuolo Eden Morales‐Narváez Charlene Regina Santos Matos Sara Longobardi Paola Giardina Arben Merkoçi 《Advanced functional materials》2015,25(38):6084-6092
Class I hydrophobin Vmh2, a peculiar surface active and versatile fungal protein, is known to self‐assemble into chemically stable amphiphilic films, to be able to change wettability of surfaces, and to strongly adsorb other proteins. Herein, a fast, highly homogeneous and efficient glass functionalization by spontaneous self‐assembling of Vmh2 at liquid–solid interfaces is achieved (in 2 min). The Vmh2‐coated glass slides are proven to immobilize not only proteins but also nanomaterials such as graphene oxide (GO) and quantum dots (QDs). As models, bovine serum albumin labeled with Alexa 555 fluorophore, anti‐immunoglobulin G antibodies, and cadmium telluride QDs are patterned in a microarray fashion in order to demonstrate functionality, reproducibility, and versatility of the proposed substrate. Additionally, a GO layer is effectively and homogeneously self‐assembled onto the studied functionalized surface. This approach offers a quick and simple alternative to immobilize nanomaterials and proteins, which is appealing for new bioanalytical and nanobioenabled applications. 相似文献
892.
893.
894.
895.
896.
897.
Dr. Hui Qiu Richard Caldwell Dr. Lesley Liu-Bujalski Dr. Andreas Goutopoulos Reinaldo Jones Justin Potnick Dr. Brian Sherer Dr. Andrew Bender Dr. Roland Grenningloh Dr. Daigen Xu Dr. Anna Gardberg Dr. Igor Mochalkin Dr. Theresa Johnson Dr. Ariele Viacava Follis Jared Head Dr. Federica Morandi 《ChemMedChem》2019,14(2):217-223
Bruton's tyrosine kinase (Btk) is an attractive target for the treatment of a wide array of B-cell malignancies and autoimmune diseases. Small-molecule covalent irreversible Btk inhibitors targeting Cys481 have been developed for the treatment of such diseases. In clinical trials, probe molecules are required in occupancy studies to measure the level of engagement of the protein by these covalent irreversible inhibitors. The result of this pharmacodynamic (PD) activity provides guidance for appropriate dosage selection to optimize inhibition of the drug target and correlation of target inhibition with disease treatment efficacy. This information is crucial for successful evaluation of drug candidates in clinical trials. Based on the pyridine carboxamide scaffold of a novel solvent-accessible pocket (SAP) series of covalent irreversible Btk inhibitors, we successfully developed a potent and selective affinity-based biotinylated probe 12 (2-[(4-{4-[5-(1-{5-[(3aS,4S,6aR)-2-oxo-hexahydro-1H-thieno[3,4-d]imidazol-4-yl]pentanamido}-3,6,9,12-tetraoxapentadecan-15-amido)pentanoyl]piperazine-1-carbonyl}phenyl)amino]-6-[1-(prop-2-enoyl)piperidin-4-yl]pyridine-3-carboxamide). Compound 12 has been used in Btk occupancy assays for preclinical studies to determine the therapeutic efficacy of Btk inhibition in two mouse lupus models driven by TLR7 activation and type I interferon. 相似文献
898.
899.
Bulge is a defect that causes geometrical inaccuracy and premature failure in the innovative incremental sheet forming (ISF) process. This study has two-fold objectives: (1) knowing the bulging behavior of a Cu clad tri-layered steel sheet as a function of forming conditions, and (2) analyzing the bending effect on bulging in an attempt to identify the associated mechanism. A series of ISF tests and bending analysis are performed to realize these objectives. From the cause-effect analysis, it is found that bulge formation in the layered sheet is sensitive to forming conditions in a way that bulging can be minimized utilizing annealed material and performing ISF with larger tool diameter and step size. The bending under tension analysis reveals that the formation of bulge is an outgrowth of bending moment that the forming tool applies on the sheet during ISF. Furthermore, the magnitude of bending moment depending upon the forming conditions varies from 0.046 to 10.24 N·m/m and causes a corresponding change in the mean bulge height from 0.07 to 0.91 mm. The bending moment governs bulging in layered sheet through a linear law. These findings lead to a conclusion that the bulge defect can be overcome by controlling the bending moment and the formula proposed can be helpful in this regards. 相似文献
900.
Zhao Hongliang Lu Tingting Liu Fengqin Yin Pan Wang Sen 《JOM Journal of the Minerals, Metals and Materials Society》2019,71(5):1643-1649
JOM - The Isa/Ausmelt smelting technology with a top submerged lance (TSL) has been extensively used in copper smelting processes. However, the TSL is extremely vulnerable to damage and failure... 相似文献