全文获取类型
收费全文 | 978篇 |
免费 | 100篇 |
专业分类
电工技术 | 11篇 |
综合类 | 1篇 |
化学工业 | 380篇 |
金属工艺 | 20篇 |
机械仪表 | 16篇 |
建筑科学 | 35篇 |
矿业工程 | 7篇 |
能源动力 | 23篇 |
轻工业 | 141篇 |
水利工程 | 9篇 |
石油天然气 | 3篇 |
无线电 | 59篇 |
一般工业技术 | 158篇 |
冶金工业 | 73篇 |
原子能技术 | 5篇 |
自动化技术 | 137篇 |
出版年
2024年 | 2篇 |
2023年 | 18篇 |
2022年 | 47篇 |
2021年 | 61篇 |
2020年 | 36篇 |
2019年 | 25篇 |
2018年 | 31篇 |
2017年 | 31篇 |
2016年 | 53篇 |
2015年 | 36篇 |
2014年 | 47篇 |
2013年 | 69篇 |
2012年 | 66篇 |
2011年 | 96篇 |
2010年 | 53篇 |
2009年 | 65篇 |
2008年 | 63篇 |
2007年 | 61篇 |
2006年 | 38篇 |
2005年 | 30篇 |
2004年 | 25篇 |
2003年 | 23篇 |
2002年 | 16篇 |
2001年 | 14篇 |
2000年 | 9篇 |
1999年 | 11篇 |
1998年 | 12篇 |
1997年 | 9篇 |
1996年 | 6篇 |
1994年 | 7篇 |
1993年 | 3篇 |
1992年 | 4篇 |
1991年 | 1篇 |
1990年 | 3篇 |
1989年 | 2篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1974年 | 1篇 |
排序方式: 共有1078条查询结果,搜索用时 15 毫秒
81.
Martin Jarenmark Håkan Carlsson Vladimir M. Trukhan Matti Haukka Sophie E. Canton Monica Walczak Wilfred Fullagar Villy Sundström Ebbe Nordlander 《Inorganic chemistry communications》2010,13(3):334-337
The heterodinuclear complexes [FeZn(L)(CH3CO2)2]+ (L = ICIMP or IPCPMP) are structural models for the dinuclear active sites of plant purple acid phosphatases. They can be systematically synthesized from mononuclear iron complexes and enhance the rate of transesterification of 2-hydroxypropyl p-nitrophenyl phosphate, an assay for the catalytic hydrolysis performed by purple acid phosphatases. 相似文献
82.
83.
84.
The airflow pattern on the spectators' terrace in stadia is affected by numerous architectural factors, such as form, size, permeability, i.e. the morphology of the building. A stadium design not taking into account the prevailing environmental parameters can result in unpleasant thermal and aerodynamic environment in the stadium bowl. 相似文献
85.
86.
Comparison of PCR and quantitative real-time PCR methods for the characterization of ruminant and cattle fecal pollution sources 总被引:1,自引:0,他引:1
Meredith R. Raith Catherine A. Kelty John F. Griffith Alexander Schriewer Stefan Wuertz Sophie Mieszkin Michele Gourmelon Georg H. Reischer Andreas H. Farnleitner Jared S. Ervin Patricia A. Holden Darcy L. Ebentier Jennifer A. Jay Dan Wang Alexandria B. Boehm Tiong Gim Aw Joan B. Rose E. Balleste W.G. Meijer Mano Sivaganesan Orin C. Shanks 《Water research》2013
The State of California has mandated the preparation of a guidance document on the application of fecal source identification methods for recreational water quality management. California contains the fifth highest population of cattle in the United States, making the inclusion of cow-associated methods a logical choice. Because the performance of these methods has been shown to change based on geography and/or local animal feeding practices, laboratory comparisons are needed to determine which assays are best suited for implementation. We describe the performance characterization of two end-point PCR assays (CF128 and CF193) and five real-time quantitative PCR (qPCR) assays (Rum2Bac, BacR, BacCow, CowM2, and CowM3) reported to be associated with either ruminant or cattle feces. Each assay was tested against a blinded set of 38 reference challenge filters (19 duplicate samples) containing fecal pollution from 12 different sources suspected to impact water quality. The abundance of each host-associated genetic marker was measured for qPCR-based assays in both target and non-target animals and compared to quantities of total DNA mass, wet mass of fecal material, as well as Bacteroidales, and enterococci determined by 16S rRNA qPCR and culture-based approaches (enterococci only). Ruminant- and cow-associated genetic markers were detected in all filters containing a cattle fecal source. However, some assays cross-reacted with non-target pollution sources. A large amount of variability was evident across laboratories when protocols were not fixed suggesting that protocol standardization will be necessary for widespread implementation. Finally, performance metrics indicate that the cattle-associated CowM2 qPCR method combined with either the BacR or Rum2Bac ruminant-associated methods are most suitable for implementation. 相似文献
87.
Djahida Lerari Sophie Peeterbroeck Samira Benali Ahmed Benaboura Philippe Dubois 《Polymer International》2010,59(1):71-77
Nanocomposites of poly(methyl methacrylate) (PMMA) filled with 3 wt% of modified natural Algerian clay (AC; montmorillonite type) were prepared by either in situ polymerization of methyl methacrylate initiated by 2,2′‐azobisisobutyronitrile or a melt‐mixing process with preformed PMMA via twin‐screw extrusion. The organo‐modification of the AC montmorillonite was achieved by ion exchange of Na+ with octadecyldimethylhydroxyethylammonium bromide. Up to now, this AC montmorillonite has found applications only in the petroleum industry as a rheological additive for drilling muds and in water purification processes; its use as reinforcement in polymer matrices has not been reported yet. The modified clay was characterized using X‐ray diffraction (XRD), which showed an important shift of the interlayer spacing after organo‐modification. The degree of dispersion of the clay in the polymer matrix and the resulting morphology of nanocomposites were evaluated using XRD and transmission electron microscopy. The resulting intercalated PMMA nanocomposites were analysed using thermogravimetric analysis and differential scanning calorimetry. The glass transition temperature of the nanocomposites was not significantly influenced by the presence of the modified clay while the thermal stability was considerably improved compared to unfilled PMMA. This Algerian natural montmorillonite can serve as reinforcing nanofiller for polymer matrices and is of real interest for the fabrication of nanocomposite materials with improved properties. Copyright © 2009 Society of Chemical Industry 相似文献
88.
89.
Charlotte Bernard Jean-Pierre Aimé Sophie Marsaudon Raphaël Levy Anne Marie Bonnot Cattien Nguyen Denis Mariolle François Bertin Amal Chabli 《Nanoscale research letters》2007,2(7):309-318
Evaporation of fluid at micro and nanometer scale may be used to self-assemble nanometre-sized particles in suspension. Evaporating
process can be used to gently control flow in micro and nanofluidics, thus providing a potential mean to design a fine pattern
onto a surface or to functionalize a nanoprobe tip. In this paper, we present an original experimental approach to explore
this open and rather virgin domain. We use an oscillating tip at an air liquid interface with a controlled dipping depth of
the tip within the range of the micrometer. Also, very small dipping depths of a few ten nanometers were achieved with multi
walls carbon nanotubes glued at the tip apex. The liquid is an aqueous solution of functionalized nanoparticles diluted in
water. Evaporation of water is the driving force determining the arrangement of nanoparticles on the tip. The results show
various nanoparticles deposition patterns, from which the deposits can be classified in two categories. The type of deposit
is shown to be strongly dependent on whether or not the triple line is pinned and of the peptide coating of the gold nanoparticle.
In order to assess the classification, companion dynamical studies of nanomeniscus and related dissipation processes involved
with thinning effects are presented. 相似文献
90.