全文获取类型
收费全文 | 3088篇 |
免费 | 187篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 15篇 |
综合类 | 2篇 |
化学工业 | 784篇 |
金属工艺 | 19篇 |
机械仪表 | 23篇 |
建筑科学 | 205篇 |
矿业工程 | 8篇 |
能源动力 | 51篇 |
轻工业 | 391篇 |
水利工程 | 43篇 |
石油天然气 | 4篇 |
武器工业 | 1篇 |
无线电 | 187篇 |
一般工业技术 | 497篇 |
冶金工业 | 674篇 |
原子能技术 | 7篇 |
自动化技术 | 366篇 |
出版年
2024年 | 7篇 |
2023年 | 55篇 |
2022年 | 111篇 |
2021年 | 182篇 |
2020年 | 91篇 |
2019年 | 111篇 |
2018年 | 128篇 |
2017年 | 97篇 |
2016年 | 117篇 |
2015年 | 69篇 |
2014年 | 105篇 |
2013年 | 188篇 |
2012年 | 161篇 |
2011年 | 245篇 |
2010年 | 166篇 |
2009年 | 193篇 |
2008年 | 165篇 |
2007年 | 154篇 |
2006年 | 124篇 |
2005年 | 80篇 |
2004年 | 92篇 |
2003年 | 78篇 |
2002年 | 51篇 |
2001年 | 42篇 |
2000年 | 38篇 |
1999年 | 32篇 |
1998年 | 41篇 |
1997年 | 34篇 |
1996年 | 30篇 |
1995年 | 29篇 |
1994年 | 23篇 |
1993年 | 21篇 |
1992年 | 13篇 |
1991年 | 12篇 |
1990年 | 18篇 |
1989年 | 15篇 |
1988年 | 9篇 |
1987年 | 10篇 |
1986年 | 9篇 |
1985年 | 12篇 |
1981年 | 6篇 |
1977年 | 8篇 |
1976年 | 8篇 |
1975年 | 5篇 |
1947年 | 8篇 |
1946年 | 5篇 |
1945年 | 6篇 |
1944年 | 11篇 |
1943年 | 7篇 |
1942年 | 10篇 |
排序方式: 共有3277条查询结果,搜索用时 15 毫秒
1.
Amanda Alliband Daniel W. Lenz Laura E. Stevenson Travis Whitmer Rex Cash Dennis Burns Sarah Hall William T.K. Stevenson 《Progress in Organic Coatings》2008
A model has been proposed to explain the failure of the original BMS10-39 epoxy paint on upper vertical surfaces in B-52 fuel tanks. The model involves interaction of the paint with DIEGME, a fuel system ice inhibitor (FSII) in jet fuel, that is distilled from the liquid fuel. In this communication, distillation experiments used to support the model are refined to better match the mass transfer of vapor from fuel in a B-52 fuel tank at close to room temperature. The interaction of these lower temperature distillates with the paint affirms the earlier model. On the basis of these experiments it is proposed that paint failure may be controlled or eliminated by reducing the level of DIEGME in the fuel. Proposed changes in military jet fuel composition are detailed. 相似文献
2.
3.
Nucleation of solidification in liquid droplets 总被引:2,自引:0,他引:2
Analytical and numerical methods have been developed to analyze the solidification kinetics of a mass of liquid droplets dispersed
in a fluid or solid matrix using classical nucleation theory. The resulting analytical expressions and numerical calculations
can be compared directly with calorimetric measurements of the droplet solidification exotherms to obtain information about
the nucleation mechanism. With increasing contact angle at the solid-liquid-matrix triple point, the solidification onset,
peak, and end temperatures and exothermic peak height all decrease sharply and the droplet solidification exotherms become
broader. Decreasing either the droplet radius or the number of potential catalytic nucleation sites produces a similar but
smaller effect. Distributions in droplet radius, contact angle, and nucleation sites have no effect on the solidification
peak temperature, but the droplet solidification exotherms become broader and more symmetric. The solidification onset temperature
is independent of cooling rate in the calorimeter, but the solidification peak and end temperatures decrease and the exothermic
peak height increases with increasing cooling rate. Predicted droplet solidification exotherms are in excellent agreement
with detailed experimental measurements on 10-nm-radius Cd droplets embedded in a solid Al matrix. Analytical predictions
give best-fit values of 43 deg and 430 for the contact angle and the number of potential catalytic nucleation sites per droplet,
respectively; numerical predictions give best-fit values of 43 deg and 750 for the contact angle and the number of potential
catalytic nucleation sites per droplet, respectively. 相似文献
4.
5.
This article reviews research on the implementation of media-rating systems, parents' use and evaluation of them, and the impact of ratings on children. Although half or more of parents report using media-rating systems, understanding of various components of the systems is low, particularly for television ratings. A meta-analysis of national polls shows that parents overwhelmingly prefer that ratings specify content, rather than giving age recommendations. A second meta-analysis, of experiments testing the effects of ratings on children's interest in programs, shows that ratings indicating restricted or controversial content have a deterrent effect for children under age 8 but that, by age 11 and especially for boys, the ratings show a small enticement effect. This effect occurs for both age-based and content-based ratings. Implications for policymakers and parents are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
6.
Lowe Rob; Bennett Paul; Walker Ian; Milne Sarah; Bozionelos George 《Canadian Metallurgical Quarterly》2003,22(5):464
The theory of planned behavior suggests attitudes are a product of salient beliefs. This study examined whether aggregating salient beliefs was plausible within a more biologically centered information-processing environment. A neural network was used to examine associations among beliefs relating to exercise intention. Data on intentions and behavioral, normative, and control beliefs from 114 respondents were used to train (by error backpropagation) a neural network to associate beliefs with intention. The R2 between the network's estimated and self-reported intention was .66. The network's representation comprised 6 belief profiles associated with high, moderate, or low behavioral intention. The neural network accommodated complex relationships among beliefs and belief-intention associations and indicated how high-level constructs such as attitudes may be viewed as the best fit (compromise state) between aroused beliefs. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
7.
Anthroposophically Extended Medicine (AEM) is a truly integrative healing system. AEM represents an expansion, not an alternative to conventional medicine. Its unique understanding of the interplay among physiological, soul and spiritual processes in healing and illness serves to bridge allopathy with naturopathy, homeopathy, functional/nutritional medicine and other healing systems. 相似文献
8.
In 4 experiments, preschoolers and kindergartners were asked to pronounce the initial consonants of spoken words. Children performed better on short words, such as bay, than on long words, such as bonus. Words with initial consonant clusters, such as brow, were more difficult for the children than words without initial consonant clusters, such as bar. A consonant cluster at the end of the word did not harm performance. Children did relatively well on words like suppose, for which the word's 1st syllable, /s/, constitutes a correct answer on the initial consonant isolation task. Children did more poorly on words like satin, for which this was not the case. Thus, the linguistic structure of a word affects children's ability to isolate the initial consonant. Implications for the design of phonemic awareness instruction are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
9.
10.