全文获取类型
收费全文 | 2495篇 |
免费 | 113篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 25篇 |
综合类 | 3篇 |
化学工业 | 528篇 |
金属工艺 | 42篇 |
机械仪表 | 54篇 |
建筑科学 | 165篇 |
矿业工程 | 11篇 |
能源动力 | 57篇 |
轻工业 | 343篇 |
水利工程 | 30篇 |
石油天然气 | 4篇 |
无线电 | 238篇 |
一般工业技术 | 374篇 |
冶金工业 | 408篇 |
原子能技术 | 37篇 |
自动化技术 | 290篇 |
出版年
2023年 | 23篇 |
2022年 | 53篇 |
2021年 | 72篇 |
2020年 | 44篇 |
2019年 | 57篇 |
2018年 | 79篇 |
2017年 | 63篇 |
2016年 | 68篇 |
2015年 | 51篇 |
2014年 | 84篇 |
2013年 | 139篇 |
2012年 | 115篇 |
2011年 | 115篇 |
2010年 | 99篇 |
2009年 | 102篇 |
2008年 | 91篇 |
2007年 | 86篇 |
2006年 | 80篇 |
2005年 | 69篇 |
2004年 | 64篇 |
2003年 | 36篇 |
2002年 | 48篇 |
2001年 | 50篇 |
2000年 | 40篇 |
1999年 | 65篇 |
1998年 | 129篇 |
1997年 | 76篇 |
1996年 | 71篇 |
1995年 | 34篇 |
1994年 | 51篇 |
1993年 | 31篇 |
1992年 | 24篇 |
1991年 | 16篇 |
1990年 | 26篇 |
1989年 | 24篇 |
1988年 | 24篇 |
1987年 | 20篇 |
1986年 | 12篇 |
1985年 | 16篇 |
1984年 | 17篇 |
1983年 | 19篇 |
1982年 | 13篇 |
1980年 | 17篇 |
1979年 | 13篇 |
1978年 | 13篇 |
1977年 | 19篇 |
1976年 | 19篇 |
1975年 | 12篇 |
1974年 | 12篇 |
1972年 | 10篇 |
排序方式: 共有2609条查询结果,搜索用时 14 毫秒
1.
Moghadam Seyedeh Hadis Ashofteh Parisa-Sadat Loáiciga Hugo A. 《Water Resources Management》2022,36(9):3181-3205
Water Resources Management - The water evaluation and planning (WEAP) approach and the invasive weed optimization algorithm (IWOA) are herein employed to determine the optimal operating policies in... 相似文献
2.
Dr. Adarshi P. Welegedara Dr. Ansis Maleckis Ruchira Bandara Dr. Mithun C. Mahawaththa Iresha Dilhani Herath Yi Jiun Tan Dr. Angeliki Giannoulis Prof. Daniella Goldfarb Prof. Gottfried Otting Prof. Thomas Huber 《Chembiochem : a European journal of chemical biology》2021,22(8):1480-1486
The selenol group of selenocysteine is much more nucleophilic than the thiol group of cysteine. Selenocysteine residues in proteins thus offer reactive points for rapid post-translational modification. Herein, we show that selenoproteins can be expressed in high yield and purity by cell-free protein synthesis by global substitution of cysteine by selenocysteine. Complete alkylation of solvent-exposed selenocysteine residues was achieved in 10 minutes with 4-chloromethylene dipicolinic acid (4Cl-MDPA) under conditions that left cysteine residues unchanged even after overnight incubation. GdIII−GdIII distances measured by double electron–electron resonance (DEER) experiments of maltose binding protein (MBP) containing two selenocysteine residues tagged with 4Cl-MDPA-GdIII were indistinguishable from GdIII−GdIII distances measured of MBP containing cysteine reacted with 4Br-MDPA tags. 相似文献
3.
Dr. Raysa Khan Tareque Dr. Storm Hassell-Hart Dr. Tobias Krojer Dr. Anthony Bradley Dr. Srikannathasan Velupillai Dr. Romain Talon Dr. Michael Fairhead Dr. Iain J. Day Kamlesh Bala Dr. Robert Felix Dr. Paul D. Kemmitt Prof. Paul Brennan Prof. Frank von Delft Dr. Laura Díaz Sáez Prof. Kilian Huber Prof. John Spencer 《ChemMedChem》2020,15(24):2513-2520
Combined photochemical arylation, “nuisance effect” (SNAr) reaction sequences have been employed in the design of small arrays for immediate deployment in medium-throughput X-ray protein–ligand structure determination. Reactions were deliberately allowed to run “out of control” in terms of selectivity; for example the ortho-arylation of 2-phenylpyridine gave five products resulting from mono- and bisarylations combined with SNAr processes. As a result, a number of crystallographic hits against NUDT7, a key peroxisomal CoA ester hydrolase, have been identified. 相似文献
4.
5.
6.
7.
8.
9.
A. J. Hugo D. M. Jakelski G. Stanitsas G. R. Sullivan R. R. Hudgins P. L. Silveston 《加拿大化工杂志》1986,64(2):349-351
In the approach to a cycle-invariant state in the forced feed concentration cycling of the CO oxidation over a NiO catalyst, a very long transient has been observed lasting 80 ks or more. This transient appears to be associated only with CO pretreatment of the catalyst and is not a general phenomenon. The slow convergence to the cycle-invariant state reported in certain modelling calculations in the literature appears to have a different cause. 相似文献
10.
Continuous simulation is performed using the US Environmental Protection Agency (USEPA) Storm Water Management Model (SWMM) to evaluate regional differences around the United States in hydrologic and water quality performance of wet-weather controls. Controls are characterised as being limited by peak inflow rate (i.e. any device with little or no storage, such as screens, filters and some proprietary devices) or by storage capacity (e.g., ponds, tanks). For flow-limited devices, results are presented in the form of percentage of annual runoff volume captured (passing through the device) for a given inflow capacity. For storage-limited devices, results are presented in two forms: percentage of annual runoff volume captured as a function of unit basin size and drawdown (drain) time, and as a percentage of total suspended solids captured, for the same two variables. Regional differences are apparent, driven mainly by variations in rainfall patterns around the country. 相似文献