全文获取类型
收费全文 | 15065篇 |
免费 | 212篇 |
国内免费 | 23篇 |
专业分类
电工技术 | 188篇 |
综合类 | 3篇 |
化学工业 | 2002篇 |
金属工艺 | 361篇 |
机械仪表 | 338篇 |
建筑科学 | 512篇 |
矿业工程 | 60篇 |
能源动力 | 306篇 |
轻工业 | 1214篇 |
水利工程 | 89篇 |
石油天然气 | 118篇 |
无线电 | 1509篇 |
一般工业技术 | 2334篇 |
冶金工业 | 4712篇 |
原子能技术 | 159篇 |
自动化技术 | 1395篇 |
出版年
2021年 | 101篇 |
2019年 | 102篇 |
2018年 | 135篇 |
2017年 | 101篇 |
2016年 | 94篇 |
2015年 | 107篇 |
2014年 | 224篇 |
2013年 | 569篇 |
2012年 | 304篇 |
2011年 | 406篇 |
2010年 | 332篇 |
2009年 | 336篇 |
2008年 | 450篇 |
2007年 | 439篇 |
2006年 | 432篇 |
2005年 | 385篇 |
2004年 | 323篇 |
2003年 | 360篇 |
2002年 | 308篇 |
2001年 | 321篇 |
2000年 | 314篇 |
1999年 | 383篇 |
1998年 | 1319篇 |
1997年 | 835篇 |
1996年 | 600篇 |
1995年 | 422篇 |
1994年 | 376篇 |
1993年 | 394篇 |
1992年 | 274篇 |
1991年 | 240篇 |
1990年 | 256篇 |
1989年 | 213篇 |
1988年 | 218篇 |
1987年 | 202篇 |
1986年 | 194篇 |
1985年 | 249篇 |
1984年 | 208篇 |
1983年 | 205篇 |
1982年 | 200篇 |
1981年 | 177篇 |
1980年 | 191篇 |
1979年 | 128篇 |
1978年 | 134篇 |
1977年 | 235篇 |
1976年 | 316篇 |
1975年 | 135篇 |
1974年 | 125篇 |
1973年 | 107篇 |
1972年 | 78篇 |
1970年 | 83篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
Piasecki Thomas M.; Jorenby Douglas E.; Smith Stevens S.; Fiore Michael C.; Baker Timothy B. 《Canadian Metallurgical Quarterly》2003,11(4):276
Five parameters of postcessation smoking withdrawal variability derived from clinical data (T. M. Piasecki, D. E. Jorenby, S. S. Smith, M. C. Fiore, & T. B. Baker, 2003a, 2003b) were predicted from baseline measures and pharmacotherapy assignment. Smokers who were more dependent, older, and high in negative affect reported more severe withdrawal. Women, heavier smokers, and those with a history of depression reported more variable symptoms. Smokers treated with nicotine patch, bupropion, or both reported less severe withdrawal than did those given placebo, but medication did not affect the slope of symptoms over time, day-to-day variability of symptoms, or the size of acute changes in symptoms associated with lapses to smoking. Prior research has shown that these symptom facets predict later relapse: thus, current pharmacotherapies may aid cessation by diminishing withdrawal severity, but they do not affect all clinically important aspects of withdrawal. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
102.
Comparison of orthorhombic and alpha-two titanium aluminides as matrices for continuous SiC-reinforced composites 总被引:1,自引:0,他引:1
P. R. Smith J. A. Graves CG. Rhodes 《Metallurgical and Materials Transactions A》1994,25(6):1267-1283
The attributes of an orthorhombic Ti aluminide alloy, Ti-21Al-22Nb (at. pct), and an alpha-two Ti aluminide alloy, Ti-24Al-11Nb
(at. pct), for use as a matrix with continuous SiC (SCS-6) fiber reinforcement have been compared. Foil-fiber-foil processing
was used to produce both unreinforced (“neat”) and unidirectional “SCS-6” reinforced panels. Microstructure of the Ti-24A1-11Nb
matrix consisted of ordered Ti3Al (α
2) + disordered beta(β), while the Ti-21 Al-22Nb matrix contained three phases: α2, ordered beta (β
0), and ordered orthorhombic(O). Fiber/ matrix interface reaction zone growth kinetics at 982 °C were examined for each composite system. Although both systems
exhibited similar interface reaction products(i.e., mixed Ti carbides, silicides, and Ti-Al carbides), growth kinetics in theα
2 +β matrix composite were much more rapid than in theO +β
0 +α
2 matrix composite. Additionally, interfacial reaction in theα
2 +β} composite resulted in a relatively large brittle matrix zone, depleted of beta phase, which was not present in theO +β
0+α
2 matrix composite. Mechanical property measurements included room and elevated temperature tensile, thermal stability, thermal
fatigue, thermo-mechanical fatigue (TMF), and creep. The three-phase orthorhombic-based alloy outperformed the α2+β alloy in all of these mechanical behavioral areas, on both an absolute and a specific(i.e., density corrected) basis. 相似文献
103.
We have sequenced the NIb coding region of sugarcane mosaic potyvirus strain SC (SCMV-SC) and eight field isolates of SCMV from Australia. This region comprised 1563 nucleotides and encoded a putative protein of 521 amino acids containing the consensus motif GDD. The protease cleavage sites between the NIa/NIb and the NIb/coat protein were found to be Q/C and Q/A, respectively. The SCMV sequences were most similar to sorghum mosaic potyvirus with identities of 70% and 78% at the nucleotide and amino acid levels, respectively. When the sequences were compared to each other, there was a maximum of 3.3% variation between isolates at the nucleotide level and a maximum of 0.8% at the amino acid level. Phylogenetic analysis of the sequences indicated the field isolates were grouped according to their geographical location. The SCMV sequence with most homology to all other isolates has been selected to generate constructs for replicase-mediated resistance. 相似文献
104.
ML Israel DA Connolly RE von Heyn JM Rock PW Smith 《Canadian Metallurgical Quarterly》1993,24(4):343-355
Fifty-two case-hardened, severely self-abusive and aggressive autistic and retarded students, living in six different community residences, were trained to exit their residences, without the presence or assistance of staff, when a fire alarm sounded at night. On a pretest, prior to an 11-week period of intensive environmental and behavioral interventions, only 25% of the students exited within 2 1/2 minutes and independent of staff assistance. At posttest, 100% exited successfully, in a mean evacuation time of 60 seconds. The study was conducted at the Behavior Research Institute (BRI). 相似文献
105.
Transient cage induction motor models for use in inverter-fed drives and controllers are reviewed. A simple transient model is presented that includes rotor deep bar effect and magnetic saturation of the magnetising and rotor leakage flux paths. The improved model requires motor details in the form of simple impedance versus frequency characteristics which can be obtained from a variety of external sources. These can range typically from detailed steady-state finite-element solutions to simple experimental measurements. The model is verified experimentally using a 75 kW, 4 pole vector controlled AC motor drive 相似文献
106.
107.
108.
CB McCoy SA Smith LR Metsch RS Anwyl R Correa L Bankston JJ Zavertnik 《Canadian Metallurgical Quarterly》1994,2(4):267-274
Socioeconomic status is the most significant factor influencing the decreased survival associated with breast cancer in minority groups in the United States. Barriers to the use of early detection programs by low-income women often result in the detection of breast cancer at stages too advanced to assure optimum outcomes. In an effort to increase accessibility of breast cancer screening among such individuals, the Early Detection Program (EDP) was initiated in 1987. The program provided breast cancer screening to women 40 years of age and older who attended eight primary healthcare centers located in low-income neighborhoods throughout Dade County, Florida. From its inception in October 1987 through December 1993, 23,866 medically underserved women had mammography examinations, with more than 17,000 of these women undergoing baseline mammograms. Since the program's inception, 126 cancers were diagnosed in 123 women. A dramatic shift from later to earlier stage breast cancers was observed. These results warrant a greater inclusion of medically underserved and lower socioeconomic status women in screening programs for the early detection of breast cancer. 相似文献
109.
Kring Ann M.; Kerr Sandra L.; Smith David A.; Neale John M. 《Canadian Metallurgical Quarterly》1993,102(4):507
Although accorded historical significance, affective features of schizophrenia have only begun to receive systematic empirical attention. Interestingly, both early psychopathology writers and more recent investigators have reported frequent discrepancies between schizophrenics' feelings and outward expressions of emotion. Using a more comprehensive assessment of emotion, the present study examines the relationship between emotional experience and expression in a sample of medication-free schizophrenics. Compared with their normal counterparts, schizophrenics were indeed much less facially expressive of both positive and negative emotions during emotion-eliciting films, yet they reported experiencing as much positive and negative emotion. Therefore, the blunted affect typical of some schizophrenics misrepresents their underlying emotional experience. Future research into an inhibition hypothesis is recommended. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
110.