全文获取类型
收费全文 | 9279篇 |
免费 | 318篇 |
国内免费 | 18篇 |
专业分类
电工技术 | 102篇 |
综合类 | 9篇 |
化学工业 | 2098篇 |
金属工艺 | 256篇 |
机械仪表 | 188篇 |
建筑科学 | 340篇 |
矿业工程 | 28篇 |
能源动力 | 207篇 |
轻工业 | 784篇 |
水利工程 | 112篇 |
石油天然气 | 38篇 |
武器工业 | 2篇 |
无线电 | 666篇 |
一般工业技术 | 1747篇 |
冶金工业 | 1933篇 |
原子能技术 | 62篇 |
自动化技术 | 1043篇 |
出版年
2023年 | 63篇 |
2022年 | 112篇 |
2021年 | 184篇 |
2020年 | 145篇 |
2019年 | 137篇 |
2018年 | 188篇 |
2017年 | 172篇 |
2016年 | 188篇 |
2015年 | 141篇 |
2014年 | 230篇 |
2013年 | 505篇 |
2012年 | 403篇 |
2011年 | 507篇 |
2010年 | 331篇 |
2009年 | 359篇 |
2008年 | 430篇 |
2007年 | 425篇 |
2006年 | 341篇 |
2005年 | 313篇 |
2004年 | 283篇 |
2003年 | 247篇 |
2002年 | 262篇 |
2001年 | 118篇 |
2000年 | 128篇 |
1999年 | 131篇 |
1998年 | 162篇 |
1997年 | 146篇 |
1996年 | 156篇 |
1995年 | 140篇 |
1994年 | 140篇 |
1993年 | 157篇 |
1992年 | 118篇 |
1991年 | 107篇 |
1990年 | 131篇 |
1989年 | 106篇 |
1988年 | 82篇 |
1987年 | 129篇 |
1986年 | 97篇 |
1985年 | 127篇 |
1984年 | 124篇 |
1983年 | 131篇 |
1982年 | 104篇 |
1981年 | 94篇 |
1980年 | 77篇 |
1979年 | 74篇 |
1978年 | 92篇 |
1977年 | 71篇 |
1976年 | 74篇 |
1975年 | 79篇 |
1974年 | 82篇 |
排序方式: 共有9615条查询结果,搜索用时 15 毫秒
81.
Rajesh L. Mehta Joseph F. Zayas 《Journal of the American Oil Chemists' Society》1995,72(10):1215-1218
Model conditions were utilized to test the antioxidative activity of a methanolic extract of ajowan (Carum coptimum) (MEA). MEA was less effective than butylated hydroxytoluene in protecting against oxidation of emulsified linoleic acid
measured by coupled oxidation of linoleic acid-β-carotene, conjugated diene values, and the thiobarbituric acid values. Ajowan
may have potential as a source of natural antioxidant. 相似文献
82.
Fourteen volatile compounds occurring in leaf trichomes of yellow squash (Cucurbita pepo L. cv. Early Prolific Straightneck) were identified. These compounds accounted for 83.5% of the volatile matrix. Ubiquitous constituents of the epidermis (myristic, palmitic, and stearic acids,n-tricosane, andn-pentacosane) accounted for 73.7%; these compounds were not bioassayed. The volatileso-,m-, andp-xylene, toluene, 2-heptanone, (R)-(+)- and (S)-(–)-limonene, and germacrene D were tested for their influence on attraction and oviposition by the pickleworm moth (Diaphania nitidalis Stoll.). No single compound, except germacrene D, was attractive. (R)-(+)-Limonene and 2-heptanone were weakly repellent. Mixtures of the highly volatile fractions were as attractive as volatiles emanating from whole, intact leaves. Oviposition levels on treated artificial sites corresponded with levels of visitation. Oviposition was significantly stimulated by whole-leaf volatiles, and (S)-(–)-limonene caused a slight but significant reduction.Mention of a trade name or proprietary product does not constitute a warranty or guarantee by the U.S. Department of Agriculture, nor does it imply exclusion of other products that may also be suitable. 相似文献
83.
Helmut Alt Esther M. Arkin Alon Efrat George Hart Ferran Hurtado Irina Kostitsyna Alexander Kröller Joseph S. B. Mitchell Valentin Polishchuk 《Theory of Computing Systems》2014,54(4):689-714
We show how to compute the smallest rectangle that can enclose any polygon, from a given set of polygons, in nearly linear time; we also present a PTAS for the problem, as well as a linear-time algorithm for the case when the polygons are rectangles themselves. We prove that finding a smallest convex polygon that encloses any of the given polygons is NP-hard, and give a PTAS for minimizing the perimeter of the convex enclosure. We also give efficient algorithms to find the smallest rectangle simultaneously enclosing a given pair of convex polygons. 相似文献
84.
Graft copolymerization of 2-hydroxyethyl methacrylate in combination with hydrophobic monomers onto soluble collagen was employed in the synthesis of hydrogels. The hydrogels were formed by simultaneous graft copolymerization and crosslinking. In order to study the effect of various crosslinking agents on the water retention character of the hydrogels, three different crosslinking agents, namely, N,N′-methylene bis acrylamide, 1,4-butanediol dimethacrylate, and hexamethylene urethanediacrylate were used. Hexamethylene urethanediacrylate crosslinked systems require a minimum amount of crosslinking agent to attain maximum water content in comparison to the other systems. 相似文献
85.
The flow behavior of polymeric fluids in tubes can be determined from measurements of the radial stress profile in the flow direction. This subject, the focus of our research, will be examined in Part II of this communication. Part I describes a research designed to test the accuracy of stress measurement with pressure transducers in a variety of recess mount geometries. No mount geometry errors were detected for the fluids used in this work over a shear rate range of 1 to 2000 sec?1. Part I also contains a survey of the literature and theoretical considerations pertinent to the entire work. 相似文献
86.
Grafting of poly(acrylic acid) onto commercial polypropylene films following irradiation by γ-rays was carried out in order to improve their surface properties. The amount of grafting with the irradiation dose was found not to follow the expected linear dependence as it is normally observed for polypropylene films prepared in laboratory amounts. We therefore analyzed the influence of the industrial manufacture process in terms of orientation of the film and addition of antioxidants by determining the peroxide surface density and the extent of grafting therefrom. The unoriented polypropylene film presented the highest peroxide concentration and was thus the most adapated material for successful grafting. Whereas phenol antioxidants limit the peroxide formation and thus must be removed from the film for grafting, the thickness of the chemical modification and can be controlled by means of phosphites. Atomicforce microscopy and wettability measurements showed that the grafted poly(acrylic acid) was heterogeneously distributed on the surface of the film, explaining the observed low reproducibility of the grafting reaction. However, we observed that the polarity of the surface was increased by the grafting. © 1995 John Wiley & Sons, Inc. 相似文献
87.
Semih Eser Robert G. Jenkins Guangquan Wei Harold H. Schobert Joseph T. Joseph 《Fuel》1991,70(12):1445-1455
High pressure microdilatometer experiments were performed on a subbituminous (Wyodak) and a bituminous (Illinois no. 6) coal in helium and hydrogen atmospheres with and without added tetralin. Wyodak coal samples showed no swelling but contractions ranging between 24 and 40 vol% upon heating at 20 and 100 °C min− 1 under helium or hydrogen pressures between 150 and 1000 psig (˜1.0–6.9 MPa). Under the same conditions, Illinois no. 6 coals displayed contractions (25–60 vol%) prior to swelling up to 117 vol%. Upon tetralin addition (at 35–190 wt% of the coal), Wyodak coal samples did not swell but showed an increasing contraction with increasing helium or hydrogen pressure due to a slight softening and fusion of the coal particles. In contrast, addition of tetralin at much lower concentrations (5–35 wt%) had a marked effect on the contraction and swelling behaviour of Illinois no. 6. A maximum swelling of 200 vol% was obtained at a tetralin addition of 30 wt%. The increased swelling results from more extensive softening and fusion of coal particles in the presence of tetralin. Both coals showed a decreasing char yield with increasing tetralin concentration. The substantially lower extent of interaction observed between Wyodak coal samples and tetralin compared to Illinois no. 6 coal can be attributed to the differences in pore structure and/or chemical constitution of the two coal samples. Examination of the resultant solids by optical microscopy revealed the microstructural changes produced by thermal treatment in dilatometer experiments. 相似文献
88.
Joseph Berger 《Polymer》1984,25(11):1629-1632
New light-sensitive polymers were prepared by modification of four different elastomers with 4-(N-dimethylmaleimido)-benzenesulphenyl chloride (DMI-BSCI). Polydienes modified by DMI-BSCI form block copolymers. These polymers show a strong increase of the glass transition temperature Tg whereby the Tg increase of modified poly(octenamer) is much smaller. Higher modified polydienes have two Tg. Modified poly(octenamers) show a melting temperature dependence Tm on the content of trans double bonds which is characteristic of statistical copolymers. The ratio of rate constants with which trans- and cis-structures in poly(octenamer) are occupied by DMI-BSCI, is 相似文献
89.
John C. Lynch Jonathan S. Green Paul K. Hovsepian Kathleen L. Reilly Joseph A. Short 《Journal of Automated Methods and Management in Chemistry》1994,16(4):131-133
Laboratory robotics has been firmly established in many non-QC
laboratories as a valuable tool for automating pharmaceutical
dosage form analysis. Often a single project or product line is used
to justify an initial robot purchase thus introducing robotics to the
laboratory for the first time. However, to gain widespread acceptance
within the laboratory and to justify further investment in robotics,
existing robots must be used to develop analyses for existing manual
methods as well as new projects beyond the scope off the original
purchase justification. The Automation Development Group in
Analytical Research and Development is a team of analysts
primarily devoted to developing new methods and adapting existing
methods for the robot. This team approach developed the expertise
and synergy necessary to significantly expand the contribution of
robotics to automation in the authors'' laboratory. 相似文献
90.
Thomas F. Derosa Benjamin J. Kaufman Rodney L.-D. Sung Joseph M. Russo 《应用聚合物科学杂志》1994,51(7):1339-1346
Perfluorobutyl-1,1,2-tri-H-1-hexene and perfluoroalkyl methacrylate have been solubilized in lubricating oil by single-step free radically grafting onto poly(ethylene-co-propylene). Perfluoroalkyl-1,1,2,2-tetra-H-ethanol and perfluoropolyether carboxylic acid were solubilized by condensing with poly[(ethylene-co-propylene)-g-glycidyl methacrylate], generating the corresponding perfluoroalkyl ether or ester, respectively. Solubilization of 1,1,2,2-tetra-H-ethanol was also achieved by condensing with poly[(ethylene-co-propylene)-g-2-isocyanoethyl methacrylate] to the corresponding perfluoroalkyl urethane. Scar diameter reductions ranged from 9.4 to 58% using perfluoro-modified graft copolymers as determined using the Four Ball Wear Test, although optimum reductions were obtained using perfluoroalkyl urethane-modified graft copolymers. Moreover, a semiquantitative correlation of scar reductions and thermal instability was determined. Sequence VI engine testing of perfluoroalkyl urethane graft copolymers containing pendant perfluoroalkyl chain lengths of 8.2 and 7.2 had an Equivalent Fuel Economy Index of 4.33 and 4.27, respectively. © 1994 John Wiley & Sons, Inc. 相似文献