全文获取类型
收费全文 | 451368篇 |
免费 | 5610篇 |
国内免费 | 1299篇 |
专业分类
电工技术 | 7907篇 |
综合类 | 296篇 |
化学工业 | 69940篇 |
金属工艺 | 19923篇 |
机械仪表 | 14176篇 |
建筑科学 | 10181篇 |
矿业工程 | 3513篇 |
能源动力 | 10576篇 |
轻工业 | 36303篇 |
水利工程 | 5484篇 |
石油天然气 | 12608篇 |
武器工业 | 36篇 |
无线电 | 48900篇 |
一般工业技术 | 92705篇 |
冶金工业 | 79943篇 |
原子能技术 | 12116篇 |
自动化技术 | 33670篇 |
出版年
2021年 | 3780篇 |
2019年 | 3606篇 |
2018年 | 6586篇 |
2017年 | 6580篇 |
2016年 | 7074篇 |
2015年 | 4318篇 |
2014年 | 7276篇 |
2013年 | 19242篇 |
2012年 | 11441篇 |
2011年 | 15100篇 |
2010年 | 12262篇 |
2009年 | 13887篇 |
2008年 | 14234篇 |
2007年 | 14047篇 |
2006年 | 12273篇 |
2005年 | 11335篇 |
2004年 | 10503篇 |
2003年 | 10144篇 |
2002年 | 10069篇 |
2001年 | 10061篇 |
2000年 | 9543篇 |
1999年 | 9668篇 |
1998年 | 23503篇 |
1997年 | 17118篇 |
1996年 | 13218篇 |
1995年 | 10006篇 |
1994年 | 8848篇 |
1993年 | 8971篇 |
1992年 | 6853篇 |
1991年 | 6804篇 |
1990年 | 6514篇 |
1989年 | 6511篇 |
1988年 | 6438篇 |
1987年 | 5513篇 |
1986年 | 5580篇 |
1985年 | 6357篇 |
1984年 | 6026篇 |
1983年 | 5616篇 |
1982年 | 5215篇 |
1981年 | 5299篇 |
1980年 | 5205篇 |
1979年 | 5139篇 |
1978年 | 5251篇 |
1977年 | 5826篇 |
1976年 | 7277篇 |
1975年 | 4770篇 |
1974年 | 4536篇 |
1973年 | 4641篇 |
1972年 | 4056篇 |
1971年 | 3703篇 |
排序方式: 共有10000条查询结果,搜索用时 140 毫秒
991.
An expression is derived for the power spectral density of a coded mark inversion (CMI) TV signal transmitted through a fibre-optic heterodyne system. An illustrative example is given, and its power spectral density has been computed numerically. 相似文献
992.
Shokooh-Saremi M. Ta'eed V.G. Littler I.C.M. Moss D.J. Eggleton B.J. Ruan Y. Luther-Davies B. 《Electronics letters》2005,41(13):738-739
The first ultra-strong, near-perfect, raised-apodised Bragg gratings in As/sub 2/S/sub 3/ chalcogenide rib waveguides using /spl lambda/=532 nm light and a modified Sagnac holographic writing setup are demonstrated. Good agreement is achieved between the experimental results and the numerical modelling of the gratings using the transfer matrix analysis for thin film structures. 相似文献
993.
Physical parameters of fiber affecting passage from the rumen 总被引:1,自引:0,他引:1
J G Welch 《Journal of dairy science》1986,69(10):2750-2754
Our objective was to review the factors that affect fiber passage from the rumen. Rumen residence time and passage from the rumen are important in control of intake, digestibility, protein metabolism, and protein escape. Physical factors associated with particle size and particle specific gravity affect passage from the rumen. Although particles of 5 cm may pass through the reticulo-omasal orifice, most particles leaving the rumen are smaller than 1 mm. Polypropylene ribbon cut into 7-cm lengths, introduced into the rumen, markedly reduced intake and were ruminated to fine particle size before being passed. Materials with specific gravity less than 1.0 are ruminated extensively and are passed slowly. As specific gravity of plastic particles increase, rumination of particles is decreased and passage is increased. Particles with specific gravities between 1.17 and 1.42 pass most rapidly. Increasing specific gravities further results in a decline in passage and a further lowering of rumination of particles. Natural hay and fresh forages are hydrated in the rumen, which causes functional specific gravity to increase. Some factors that affect rate of change of functional specific gravity of forages have been investigated. Small particle size, autoclaved rumen fluid, buffer solutions, and specific salts increased the rate of change of functional specific gravity of particles. Understanding of these factors may enable us to make better decisions in managing ruminant productions systems. 相似文献
994.
N Paster J Blumenthal-Yonassi R Barkai-Golan M Menasherov 《International journal of food microbiology》1991,12(2-3):157-165
The production of zearalenone by an isolate of Fusarium equiseti was studied in chemically defined medium and in corn grains stored under modified atmospheres. An increase in the concentrations of sucrose or xylose in Czapek's medium resulted in increased toxin production, while no toxin was produced when lactose was present in the medium. Methionine (10(-2) and 10(-3) M) and cystine (10(-3) M) added to Czapek's medium inhibited zearalenone production. When amino acids or nitrogen salts were added as the sole nitrogen source, only alanine, tryptophan and NH4Cl totally inhibited zearalenone production. Zearalenone production was inhibited almost completely in high-moisture corn grains (27%) kept under atmospheres enriched with high CO2 levels (60%, 40% or 20%) with either 20% or 5% O2. However, a lower amount of CO2 was needed to inhibit fungal development and toxin formation when a reduced O2 level was applied. 相似文献
995.
Crystallization of some anorthite-diopside glass precursors 总被引:2,自引:0,他引:2
C. Leonelli T. Manfredini M. Paganelli P. Pozzi G. C. Pellacani 《Journal of Materials Science》1991,26(18):5041-5046
Anorthite and diopside have been obtained from complete devitrification of glasses belonging to the quaternary system MgO-CaO-Al2O3-SiO2. Microstructure, the natural trend of the nucleation mechanism and kinetic studies on the crystallization phenomenon have been investigated by means of optical and electron microscopies, thermal and thermomechanical techniques and X-ray powder diffractometry. All the glasses investigated show a complete crystallization starting from a simple surface nucleation process. The activation energy for the crystallization process proved to be higher than that for viscous flow, leading to an important aspect modification in the sample during ceramization. Thermal stability and physical properties of both glass and glass-ceramic materials have been tested, suggesting the possible use of these materials in industrial application. 相似文献
996.
C. Y. Liao S. N. Atluri 《International journal for numerical methods in engineering》1991,32(6):1339-1361
An efficient method, based on the Schwarz–Neumann alternating technique, is presented for computing weight functions of a general solid (3-D as well as 2-D), with embedded or surface-flaw configurations. The total rate of change of the crack-opening displacements, due to simple perturbations of crack-dimension characteristics, is conveniently decomposed into the infinite-domain and boundary-correction parts. The former is determined from available analytical solutions of ideal-shaped cracks, whereas the latter is computed numerically by imposing nil boundary-traction requirements for the displacement field corresponding to the weight functions. Numerical examples, with solutions for 3-D weighted-average and local stress intensity factors, indicate that the proposed method is very accurate and efficient. 相似文献
997.
On the basis of the results of measurements in the pressure range 3.5–11 GPa for the shear strength of a number of shock-compressed substances carried out taking account of the completion of relaxation processes and establishment of pressure equilibrium the divergence is explained in results published previously for measurements of the dynamic yield point for highly ductile metals of the lead and tin type.Translated from Problemy Prochnosti, No. 10, pp. 50–54, October, 1991. 相似文献
998.
V. Vassilev S. Thijs P. L. Segura P. Wambacq P. Leroux G. Groeseneken M. I. Natarajan H. E. Maes M. Steyaert 《Microelectronics Reliability》2005,45(2):255-268
This paper describes an approach to design ESD protection for integrated low noise amplifier (LNA) circuits used in narrowband transceiver front-ends. The RF constraints on the implementation of ESD protection devices are relaxed by co-designing the RF and the ESD blocks, considering them as one single circuit to optimise. The method is applied for the design of 0.25 μm CMOS LNA. Circuit protection levels higher than 3 kV HBM stress are achieved using conventional highly capacitive ggNMOS snapback devices. The methodology can be extended to other RF-CMOS circuits requiring ESD protection by merging the ESD devices in the functionality of the corresponding matching blocks. 相似文献
999.
A new phenomenon accompanying the electrolysis of salts has been observed, whereby an ordered composite is formed under certain conditions (electrolyte composition, current density). The composite comprises an inorganic salt crystal penetrated by metal nano- and microwires. This phenomenon can serve as a basis for the technology of oriented and ordered nanowire array synthesis. 相似文献
1000.
A prospective investigation of the impact of childhood sexual abuse on the development of sexuality.
Noll Jennie G.; Trickett Penelope K.; Putnam Frank W. 《Canadian Metallurgical Quarterly》2003,71(3):575
The sexual attitudes and activities of 77 sexually abused and 89 comparison women (mean age=20.41, SD=3.38) were assessed 10 years after disclosure in a longitudinal, prospective study of the long-term effects of childhood sexual abuse. Abused participants were more preoccupied with sex, younger at first voluntary intercourse, more likely to have been teen mothers, and endorsed lower birth control efficacy than comparison participants. When psychological functioning earlier in development was examined, sexual preoccupation was predicted by anxiety, sexual aversion was predicted by childhood sexual behavior problems, and sexual ambivalence (simultaneous sexual preoccupation and sexual aversion) was predicted by pathological dissociation. Findings also indicate that biological father abuse may be associated with greater sexual aversion and sexual ambivalence. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献