全文获取类型
收费全文 | 9100篇 |
免费 | 424篇 |
国内免费 | 11篇 |
专业分类
电工技术 | 122篇 |
综合类 | 38篇 |
化学工业 | 2289篇 |
金属工艺 | 234篇 |
机械仪表 | 188篇 |
建筑科学 | 610篇 |
矿业工程 | 20篇 |
能源动力 | 293篇 |
轻工业 | 880篇 |
水利工程 | 87篇 |
石油天然气 | 43篇 |
武器工业 | 1篇 |
无线电 | 688篇 |
一般工业技术 | 1487篇 |
冶金工业 | 632篇 |
原子能技术 | 62篇 |
自动化技术 | 1861篇 |
出版年
2023年 | 86篇 |
2022年 | 207篇 |
2021年 | 335篇 |
2020年 | 184篇 |
2019年 | 201篇 |
2018年 | 272篇 |
2017年 | 235篇 |
2016年 | 316篇 |
2015年 | 235篇 |
2014年 | 345篇 |
2013年 | 634篇 |
2012年 | 491篇 |
2011年 | 621篇 |
2010年 | 437篇 |
2009年 | 505篇 |
2008年 | 460篇 |
2007年 | 417篇 |
2006年 | 353篇 |
2005年 | 310篇 |
2004年 | 276篇 |
2003年 | 268篇 |
2002年 | 196篇 |
2001年 | 146篇 |
2000年 | 142篇 |
1999年 | 126篇 |
1998年 | 163篇 |
1997年 | 144篇 |
1996年 | 104篇 |
1995年 | 86篇 |
1994年 | 82篇 |
1993年 | 89篇 |
1992年 | 60篇 |
1991年 | 60篇 |
1990年 | 62篇 |
1989年 | 72篇 |
1988年 | 52篇 |
1987年 | 48篇 |
1986年 | 53篇 |
1985年 | 55篇 |
1984年 | 63篇 |
1983年 | 44篇 |
1982年 | 38篇 |
1981年 | 37篇 |
1980年 | 41篇 |
1979年 | 37篇 |
1978年 | 39篇 |
1977年 | 38篇 |
1976年 | 47篇 |
1975年 | 43篇 |
1973年 | 36篇 |
排序方式: 共有9535条查询结果,搜索用时 15 毫秒
41.
In electrophotographic printing, a periodic clustered-dot halftone pattern is preferred for a smooth and stable result. In addition, the screen frequency should be high enough to minimize the visibility of the halftone textures and to ensure good detail rendition. However, at these frequencies, the halftone cell may contain too few pixels to provide a sufficient number of distinct gray levels. This will result in contouring and posterization. The traditional solution is to grow the clusters asynchronously within a repeating block of clusters known as a supercell. The growth of each individual cluster is governed by a microscreen. The order in which the clusters grow within the supercell is determined by a macroscreen. Typically, the macroscreen is a recursive pattern due to Bayer. In highlights and shadows, this ordering results in visible artifacts. Replacing the Bayer screen by a stochastic macroscreen eliminates these artifacts, but results in new artifacts. In this paper, we propose a new composite screen architecture that employs multiple microscreens and multiple macroscreens in the highlights and shadows. These screens are jointly designed by using the direct binary search (DBS) algorithm. 相似文献
42.
Paulussen-Hoogeboom Marja C.; Stams Geert Jan J. M.; Hermanns Jo M. A.; Peetsma Thea T. D. 《Canadian Metallurgical Quarterly》2007,43(2):438
This meta-analytic review (k = 62 studies; N = 7,613 mother-child dyads) shows that effect sizes for the association between child negative emotionality and parenting were generally small and were moderated by sample and measurement characteristics. The association between more child negative emotionality and less supportive parenting was relatively strong in lower socioeconomic status families, reversed in higher socioeconomic status families, and limited to studies with relatively high percentages of participants from ethnic minorities and studies using parent report to assess negative emotionality. Higher levels of child negative emotionality were associated with more restrictive control in samples with less than 75% 1st-born children, as well as in infants and preschoolers, and in studies using parent report or composite measures to assess both negative emotionality and restrictive parenting. Finally, more child negative emotionality was associated with less inductive control. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
43.
44.
In most industrialized countries, the end of the Cold War marked a change in focus from preparedness for war to an increasing focus on civil society's own vulnerability and safety. To meet new threats and changing risks, there is also a need for new analytical concepts. Societal safety is a concept developed in Norway during the last decade. It could be defined as: ‘The society's ability to maintain critical social functions, to protect the life and health of the citizens and to meet the citizens' basic requirements in a variety of stress situations’. It aims to be a systematic approach for understanding, mitigating and responding to social problems such as extraordinary stresses and losses, interferences in complex and mutual dependent systems, or lack of trust in vital social institutions. Future threats to society are not limited to specific sectors or areas, but stem from complex interactions amongst economic, technological, social and cultural factors. Thus, the main challenges to improve societal safety will be the ability to coordinate, organize and assign clear roles to different actors at the international, national and local levels. Societal safety has interfaces with other safety‐related areas such as national security, sustainable development, human security and incident management (handling of isolated accidents, common illness and ordinary criminal acts). Societal safety is, however, a sensitive political issue containing dilemmas and value choices that are hardly possible to perceive or solve as pure scientific problems. 相似文献
45.
Development of adolescent reading comprehension in language 1 and language 2: A longitudinal analysis of constituent components. 总被引:1,自引:0,他引:1
van Gelderen Amos; Schoonen Rob; Stoel Reinoud D.; de Glopper Kees; Hulstijn Jan 《Canadian Metallurgical Quarterly》2007,99(3):477
This study investigated the relationship between reading comprehension development of 389 adolescents in their dominant language (Language 1 [L1], Dutch) and a foreign language (Language 2 [L2], English). In each consecutive year from Grades 8 through 10, a number of measurements were taken. Students' reading comprehension, their linguistic knowledge (vocabulary and grammar knowledge) and processing efficiency (speed of word recognition and sentence comprehension) in both languages, and their metacognitive knowledge about reading were assessed. The relative strengths of the effects of these components of reading were analyzed to distinguish among 3 hypotheses about the relationship between L1 and L2 reading comprehension: the transfer hypothesis, the threshold hypothesis, and the processing efficiency hypothesis. The transfer hypothesis predicts a strong relationship between L1 and L2 reading comprehension and a strong effect of metacognitive knowledge on L2 reading comprehension, whereas the threshold and processing efficiency hypotheses predict a more important role of language-specific knowledge and processing skills. Results support the transfer hypothesis, although language-specific knowledge and fluency also contribute to L2 reading performance. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
46.
Fabrice Martin Marc-Etienne Jan Samuel Rey-Mermet Brahim Belgacem Dong Su Marco Cantoni Paul Muralt 《IEEE transactions on ultrasonics, ferroelectrics, and frequency control》2006,53(7):1339-1343
Polycrystalline A1N thin films were deposited by RF reactive magnetron sputtering on Pt(111)/Ti electrode films. The substrates were tilted by an angle ranging from 40 degrees to 70 degrees with respect to the target normal. A low deposition temperature and a high sputter gas pressure were found ideal for tilted growth. The resulting grain tilt angle amounts to about half the substrate tilt angle. For coupling evaluation, 5 GHz solidly mounted resonator structures have been realized. The tilted grain A1N films exhibited a permittivity in the 9.5-10.5 range and loss tangent of 0.3%. Two shear modes as well as the longitudinal mode could be clearly identified. The coupling coefficient k2(eff) of the fundamental thickness shear mode (TS0) was found to be about 0.5%, which is compatible with a c-axis tilt of about 6 degrees. 相似文献
47.
We present a technique for approximating isotropic BRDFs and precomputed self-occlusion that enables accurate and efficient prefiltered environment map rendering. Our approach uses a nonlinear approximation of the BRDF as a weighted sum of isotropic Gaussian functions. Our representation requires a minimal amount of storage, can accurately represent BRDFs of arbitrary sharpness, and is above all, efficient to render. We precompute visibility due to self-occlusion and store a low-frequency approximation suitable for glossy reflections. We demonstrate our method by fitting our representation to measured BRDF data, yielding high visual quality at real-time frame rates. 相似文献
48.
49.
Maciej Winiewski Artur Jakubiak Jan Szymanowski 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1995,63(3):209-214
Decyl isonicotiniate and decyl nicotiniate permit a rapid extraction of palladium(II) from its hydrochloride solutions. Decyl picoliniate is not a suitable extractant. 4-Octylphenylamine can act as a phase transfer catalyst when its concentration in the organic phase is at least 2·5 × 10?4 M . It seems that the interfacial adsorption of pyridine carboxylates and of 4-octylphenylamine is not the decisive phenomenon in palladium(II) extraction. The negligible protonation of the pyridine-type extractants and the phase transfer catalysis explains well the quick extraction of palladium(II) with the commercial and highly hydrophobic extractant ACORGA CLX-50. 相似文献
50.
Jerzy Stangierski Jan Zabielski Jacek Kijowski 《European Food Research and Technology》2007,226(1-2):233-237
The effect of addition of 3 g/L of commercially available transglutaminase preparation to protein extracts obtained from mechanically
recovered poultry meat was studied. The content of free thiol groups (–SH), thermal drip and gel texture were determined.
After pre-incubation at 7–8 °C for 1, 3, 5 and 24 h, the samples were subjected to one-step heating at 50, 60, 70 and 80 °C
and two-step heating at 50/80, 55/80 and 60/80 °C. The addition of preparation and the extension of pre-incubation time led
to decrease of free -SH groups content. After heating, the number of thiol groups decreased, the texture was improved, but
thermal drip from gels increased. The amount of –SH groups in gel extracts subjected to one-step heating decreased with simultaneous
increase of mechanical strength of gels. Protein gels subjected to two-step heating exhibited higher firmness than gels subjected
to one-step heating. Thus, the 3 g/L addition of transglutaminase preparation in combination with one-step thermal processing
at 70 °C and pre-incubation for 3 h contributed to improvement of texture properties of model gels and low thermal drip. 相似文献