全文获取类型
收费全文 | 7879篇 |
免费 | 254篇 |
国内免费 | 7篇 |
专业分类
电工技术 | 76篇 |
综合类 | 5篇 |
化学工业 | 1429篇 |
金属工艺 | 156篇 |
机械仪表 | 162篇 |
建筑科学 | 483篇 |
矿业工程 | 15篇 |
能源动力 | 234篇 |
轻工业 | 856篇 |
水利工程 | 123篇 |
石油天然气 | 34篇 |
无线电 | 612篇 |
一般工业技术 | 1332篇 |
冶金工业 | 1458篇 |
原子能技术 | 62篇 |
自动化技术 | 1103篇 |
出版年
2023年 | 36篇 |
2022年 | 81篇 |
2021年 | 104篇 |
2020年 | 97篇 |
2019年 | 111篇 |
2018年 | 127篇 |
2017年 | 142篇 |
2016年 | 134篇 |
2015年 | 149篇 |
2014年 | 204篇 |
2013年 | 442篇 |
2012年 | 375篇 |
2011年 | 471篇 |
2010年 | 325篇 |
2009年 | 376篇 |
2008年 | 484篇 |
2007年 | 398篇 |
2006年 | 335篇 |
2005年 | 349篇 |
2004年 | 285篇 |
2003年 | 254篇 |
2002年 | 238篇 |
2001年 | 153篇 |
2000年 | 106篇 |
1999年 | 147篇 |
1998年 | 238篇 |
1997年 | 179篇 |
1996年 | 160篇 |
1995年 | 129篇 |
1994年 | 113篇 |
1993年 | 115篇 |
1992年 | 84篇 |
1991年 | 62篇 |
1990年 | 78篇 |
1989年 | 89篇 |
1988年 | 61篇 |
1987年 | 72篇 |
1986年 | 65篇 |
1985年 | 84篇 |
1984年 | 81篇 |
1983年 | 73篇 |
1982年 | 61篇 |
1981年 | 62篇 |
1980年 | 47篇 |
1979年 | 50篇 |
1978年 | 45篇 |
1977年 | 38篇 |
1976年 | 51篇 |
1975年 | 37篇 |
1973年 | 29篇 |
排序方式: 共有8140条查询结果,搜索用时 15 毫秒
41.
42.
43.
Sorghum (cv. Maldandi M35-1) was modified to 12, 14 and 16% moisture content (m.c.) and heat-treated with microwave energy at 3 levels, for 30 sec (=4.5, 9 and 18 kJ), and 60 sec (=9, 18 and 36 kJ). The effect of microwave heating on rise and subsequent fall in grain temperature, reduction in m.c. and quality characteristics including germination, seedling dry matter, free fatty acids (FFA) and contaminant fungi was determined. The temperature attained and the moisture loss in the sorghum grain was affected by grain m.c. and the time of exposure. At the lowest and highest microwave treatment level grain temperatures reached 30–40°C and 90–101°C, respectively. However, a 60-sec treatment at the highest energy level was lethal for the grain, particularly at 14 and 16% m.c. The FFA values were unaffected by microwave treatment. Statistical analyses showed that the microwave power level and time individually, and power level × time interactions were significant for most quality characteristics. The fungi present most abundantly on the sorghum grain were Eurotium spp., Aspergillus candidus, A. niger and Penicillium spp. Increasing m.c. and microwave heating resulted in elimination of most fungi after a 30-sec exposure time. With a 60-sec exposure period, practically all fungi were eliminated from the grain. 相似文献
44.
Xiang Lu S. Sundar Kumar Iyer Jin Lee Brian Doyle Zhineng Fan Paul K. Chu Chenming Hu Nathan W. Cheung 《Journal of Electronic Materials》1998,27(9):1059-1066
We have demonstrated feasibility to form silicon-on-insulator (SOI) substrates using plasma immersion ion implantation (PIII)
for both separation by implantation of oxygen and ion-cut. This high throughput technique can substantially lower the high
cost of SOI substrates due to the simpler implanter design as well as ease of maintenance. For separation by plasma implantation
of oxygen wafers, secondary ion mass spectrometry analysis and cross-sectional transmission electron micrographs show continuous
buried oxide formation under a single-crystal silicon overlayer with sharp Si/SiO2 interfaces after oxygen plasma implantation and high-temperature (1300°C) annealing. Ion-cut SOI wafer fabrication technique
is implemented for the first time using PIII. The hydrogen plasma can be optimized so that only one ion species is dominant
in concentration and there are minimal effects by other residual ions on the ion-cut process. The physical mechanism of hydrogen
induced silicon surface layer cleavage has been investigated. An ideal gas law model of the microcavity internal pressure
combined with a two-dimensional finite element fracture mechanics model is used to approximate the fracture driving force
which is sufficient to overcome the silicon fracture resistance. 相似文献
45.
Aqueous extracts of the coralline red algaeBossiella orbigniana have been shown to catalyze the enzymatic oxidation of arachidonic acid to a previously unreported ω6 eicosapentaenoic acid
product. This unique fatty acid contains a conjugated tetraene with absorption maxima at 293, 306, and 321 nm, and was identified
by spectral methods as 5(Z),8(Z),10(E),12(E),14(Z)-eicosapentaenoic acid. The compound was given the trivial name bosseopentaenoic
acid. Under experimental conditions, production of bosseopentaenoic acid was linear up to 2 hr and dioxygen was consumed.
Bosseopentaenoic acid, along with several other conjugated tetraenes, was also present in the algae endogenously as revealed
by a comparison of the ultraviolet (UV) spectra and the high-performance liquid chromatographic (HPLC) pattern of the purified
product and the organic extract ofBossiella. 相似文献
46.
National and regional corporate spatial structure 总被引:3,自引:0,他引:3
Much is known about the macro-impacts of business activities on national and regional economies; however, comparatively little
is known at the micro level about the impact spatial agglomeration of corporate wealth and performance has on urban systems.
This paper reports on a collaborative research project between the Australian Housing and Urban Research Institute and Dun
and Bradstreet, an international financial credit agency, to analyse the spatial implications of corporate structure in metropolitan
regions. This paper analyses spatial patterns of medium to large businesses in three Australian State capital cities at the
postcode level in order to assess the agglomeration of corporate capital, sales, and performance. The research indicates that
ratio analysis can provide a useful insight into the competitiveness of metropolitan regions and the control corporate headquarters
have over decision making and investment processes. The findings of this research are of special interest to capital markets,
business and urban researchers in the Asia Pacific Region.
Received: September 1997/Accepted: September 2001 相似文献
47.
Examines, in the context of cancer illness, S. E. Taylor and J. D. Brown's (see record 1988-16903-001) claim that mental health is to a degree predicated on illusory beliefs about the self, one's control, and the future. The Heroic Model (HM), a stance toward cancer characterized by belief that positive thoughts and feelings, a fighting spirit, and an optimistic outlook will promote cancer remission, is presented as paradigmatic of Taylor and Brown's thesis. Strong and weak formulations of the HM (the former affirming a direct influence of mental states over physical processes, and the latter affirming indirect effects only) are examined with respect to their potential adaptive value as true or false beliefs, with different consequences for well-being. (French abstract) (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
48.
LB Corbeil RP Gogolewski I Kacskovics KH Nielsen RR Corbeil JL Morrill R Greenwood JE Butler 《Canadian Metallurgical Quarterly》1997,61(3):207-213
AIMS/BACKGROUND: To characterise clinically a large kindred segregating retinitis pigmentosa and sensorineural hearing impairment in an autosomal dominant pattern and perform genetic linkage studies in this family. Extensive linkage analysis in this family had previously excluded the majority of loci shown to be involved in the aetiologies of RP, some other forms of inherited retinal degeneration, and inherited deafness. METHODS: Members of the family were subjected to detailed ophthalmic and audiological assessment. In addition, some family members underwent skeletal muscle biopsy, electromyography, and electrocardiography. Linkage analysis using anonymous microsatellite markers was performed on DNA samples from all living members of the pedigree. RESULTS: Patients in this kindred have a retinopathy typical of retinitis pigmentosa in addition to a hearing impairment. Those members of the pedigree examined demonstrated a subclinical myopathy, as evidence by abnormal skeletal muscle histology, electromyography, and electrocardiography. LOD scores of Zmax = 3.75 (theta = 0.10), Zmax = 3.41 (theta = 0.10), and Zmax = 3.25 (theta = 0.15) respectively were obtained with the markers D9S118, D9S121, and ASS, located on chromosome 9q34-qter, suggesting that the causative gene in this family may lie on the long arm (q) of chromosome 9. CONCLUSIONS: These data indicate that the gene responsible for the phenotype in this kindred is located on chromosome 9 q. These data, together with evidence that a murine deafness gene is located in a syntenic area of the mouse genome, should direct the research community to consider this area as a candidate region for retinopathy and/or deafness genes. 相似文献
49.
According to J. F. Dovidio and S. L. Gaertner's (1998) integrated model of racism, politically liberal European Americans tend to express racism differently than conservative European Americans, with liberals demonstrating aversive racism and conservatives, symbolic or modern racism. In support of the model, in Experiment 1 liberals showed bias in favor of a twice-prosecuted African American relative to a European American in their judgment of double jeopardy, whereas conservatives did the reverse. Experiment 2 replicated these effects while eliminating a confound in the design of Experiment 1. Experiment 3 found evidence for the intrapsychic conflict hypothesized to underlie aversive racism. Specifically, only liberals displayed greater physiological arousal to the touch of an African American versus a European American experimenter. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
50.
Seven hundred three members of the Society for Industrial and Organizational Psychology indicated agreement or disagreement with 49 propositions regarding cognitive ability tests in organizations. There was consensus that cognitive ability tests are valid and fair, that they provide good but incomplete measures, that different abilities are necessary for different jobs, and that diversity is valuable. Items dealing with the unique status of cognitive ability were most likely to generate polarized opinions. A 2-factor model, classifying items as those reflecting societal concerns over the consequences of ability testing and those reflecting an emphasis on the unique status of "g," fit the data well, and these factors proved especially important for predicting responses to the more controversial items. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献