全文获取类型
收费全文 | 628篇 |
免费 | 18篇 |
专业分类
化学工业 | 104篇 |
金属工艺 | 9篇 |
机械仪表 | 13篇 |
建筑科学 | 21篇 |
能源动力 | 11篇 |
轻工业 | 32篇 |
水利工程 | 12篇 |
无线电 | 35篇 |
一般工业技术 | 98篇 |
冶金工业 | 225篇 |
原子能技术 | 6篇 |
自动化技术 | 80篇 |
出版年
2023年 | 4篇 |
2022年 | 6篇 |
2021年 | 20篇 |
2020年 | 5篇 |
2019年 | 13篇 |
2018年 | 10篇 |
2017年 | 12篇 |
2016年 | 14篇 |
2015年 | 7篇 |
2014年 | 14篇 |
2013年 | 29篇 |
2012年 | 25篇 |
2011年 | 28篇 |
2010年 | 23篇 |
2009年 | 22篇 |
2008年 | 26篇 |
2007年 | 27篇 |
2006年 | 20篇 |
2005年 | 17篇 |
2004年 | 21篇 |
2003年 | 22篇 |
2002年 | 20篇 |
2001年 | 18篇 |
2000年 | 9篇 |
1999年 | 14篇 |
1998年 | 43篇 |
1997年 | 27篇 |
1996年 | 23篇 |
1995年 | 25篇 |
1994年 | 10篇 |
1993年 | 14篇 |
1992年 | 10篇 |
1991年 | 5篇 |
1990年 | 3篇 |
1989年 | 8篇 |
1988年 | 5篇 |
1987年 | 3篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1984年 | 7篇 |
1983年 | 2篇 |
1982年 | 5篇 |
1981年 | 5篇 |
1977年 | 4篇 |
1976年 | 6篇 |
1975年 | 1篇 |
1973年 | 1篇 |
1971年 | 2篇 |
1969年 | 2篇 |
1966年 | 1篇 |
排序方式: 共有646条查询结果,搜索用时 15 毫秒
1.
2.
Holly Rushmeier Jason Dykes John Dill Peter Yoon 《Computer Graphics and Applications, IEEE》2007,27(6):12-16
Defining visualization education is still a work in progress. Visualization education is not just a subject within computer science. Computer scientists are not always the appropriate choice to teach visualization courses on their own. Visualization is not just mastering a set of concepts but acquiring skills. Student should learn by doing, either using one tool or a variety of tools, depending on the course's focus. 相似文献
3.
We present a two-sorted algebra, called aPeirce algebra, of relations and sets interacting with each other. In a Peirce algebra, sets can combine with each other as in a Boolean algebra, relations can combine with each other as in a relation algebra, and in addition we have both a set-forming operator on relations (the Peirce product of Boolean modules) and a relation-forming operator on sets (a cylindrification operation). Two applications of Peirce algebras are given. The first points out that Peirce algebras provide a natural algebraic framework for modelling certain programming constructs. The second shows that the so-calledterminological logics arising in knowledge representation have evolved a semantics best described as a calculus of relations interacting with sets. 相似文献
4.
5.
Poly(ether ether ketone) (PEEK) is high performance semicrystalline thermoplastic with a glass transition temperature of 143°C. The melting point (Tm) is quoted as 334°C. Because of its high thermal transitions, PEEK, requires high temperatures for processing, at least 370–400°C. It has been determined that under the recommended processing conditions PEEK can undergo branching and eventually crosslinks. An alternative to melt processing PEEK is to apply the powder metallurgy technique of sintering. This involves cold (room temperature) compaction of the polymeric powder, followed by pressure free sintering of the resultant green body. We have reported a process for preparing submicron PEEK particles, and the focus here is on the free sintering of these particles with emphsis on the effects of particle size, sintering temperature, and compaction pressure. The data is evaluated using the two particle model developed by Frenkel as well as the crack healing theory developed by Wool. 相似文献
6.
Cooper M. Lynne; Wood Phillip K.; Orcutt Holly K.; Albino Austin 《Canadian Metallurgical Quarterly》2003,84(2):390
Longitudinal data from a representative sample of 1,978 Black and White adolescents were used to examine the role of personality in multiple risk or problem behaviors. Results indicate that covariation among diverse behaviors (educational underachievement, delinquent behavior, substance use, sexual behavior) can be adequately modeled by a single higher order factor, and that impulsivity and avoidance coping serve as generalized risk factors for involvement in these behaviors. Whereas none of the personality variables examined explained change in problem behaviors once established, avoidance coping prospectively predicted involvement among a subgroup of adolescents with little or no prior involvement. Results suggest that dysfunctional styles of regulating emotions and emotionally driven behaviors are core features of risky or problem behaviors during adolescence. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
7.
F Boersma JA Eefsting W van den Brink W van Tilburg 《Canadian Metallurgical Quarterly》1995,26(2):57-64
In the Netherlands both nursing homes and homes for the aged serve as a residence for demented elderly. Although these institutions differ considerably regarding financing and care facilities, specific functions of each institute concerning demented elderly have not been clearly defined. In order to know to what extent residential facilities serve demented elderly, the prevalence and severity of dementia among residents aged 65 and over was studied as part of a prevalence study among elderly people in a rural area of the Netherlands. The target population existed of all persons aged 65 and over who were registered in eight general practices. Patients who had to leave the practice on account of ill-health and were admitted to nursing homes were included in the study. In a two stage study the MMSE was applied as a screening instrument. Based on MMSE-score a non-proportional stratified random sample was drawn for the second, diagnostic stage, which existed of the CAMDEX. Prevalence estimates for DSM-III-R-dementia were 21% among residents of homes for the aged, 48% among residents of somatic wards of nursing homes and 100% among those admitted to psychogeriatric wards of nursing homes. Severity of dementia was highest among residents of psychogeriatric wards of nursing homes and lowest among those living in homes for the aged. Prevalence of dementia among residents of homes for the aged can be fully attributed to the age-distribution. The high frequency of dementia among residents of somatic nursing home wards can be explained in several ways: First, admission can be necessary due to a combination of dementia and somatic illness.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
8.
T Peelen M van Vliet A Petrij-Bosch R Mieremet C Szabo AM van den Ouweland F Hogervorst R Brohet MJ Ligtenberg E Teugels R van der Luijt AH van der Hout JJ Gille G Pals I Jedema R Olmer I van Leeuwen B Newman M Plandsoen M van der Est G Brink S Hageman PJ Arts MM Bakker P Devilee 《Canadian Metallurgical Quarterly》1997,60(5):1041-1049
We have identified 79 mutations in BRCA1 in a set of 643 Dutch and 23 Belgian hereditary breast and ovarian cancer families collected either for research or for clinical diagnostic purposes. Twenty-eight distinct mutations have been observed, 18 of them not previously reported and 12 of them occurring more than once. Most conspicuously, a 2804delAA mutation has been found 19 times and has never been reported outside the Netherlands. A common haplotype spanning > or = 375 kb could be identified for each of the nine examined recurrent mutations, indicating the presence of multiple BRCA1 founder mutations in the Dutch population. The 2804delAA mutation has been estimated to have originated approximately 32 generations ago. No specific breast or ovarian cancer phenotype could be assigned to any of the common mutations, and the ovarian cancer incidence among 18 families with the 2804delAA mutation was heterogeneous. 相似文献
9.
New climate change scenarios for the Netherlands. 总被引:4,自引:0,他引:4
B van den Hurk A K Tank G Lenderink A van Ulden G J van Oldenborgh C Katsman H van den Brink F Keller J Bessembinder G Burgers G Komen W Hazeleger S Drijfhout 《Water science and technology》2007,56(4):27-33
A new set of climate change scenarios for 2050 for the Netherlands was produced recently. The scenarios span a wide range of possible future climate conditions, and include climate variables that are of interest to a broad user community. The scenario values are constructed by combining output from an ensemble of recent General Climate Model (GCM) simulations, Regional Climate Model (RCM) output, meteorological observations and a touch of expert judgment. For temperature, precipitation, potential evaporation and wind four scenarios are constructed, encompassing ranges of both global mean temperature rise in 2050 and the strength of the response of the dominant atmospheric circulation in the area of interest to global warming. For this particular area, wintertime precipitation is seen to increase between 3.5 and 7% per degree global warming, but mean summertime precipitation shows opposite signs depending on the assumed response of the circulation regime. Annual maximum daily mean wind speed shows small changes compared to the observed (natural) variability of this variable. Sea level rise in the North Sea in 2100 ranges between 35 and 85 cm. Preliminary assessment of the impact of the new scenarios on water management and coastal defence policies indicate that particularly dry summer scenarios and increased intensity of extreme daily precipitation deserves additional attention in the near future. 相似文献
10.