全文获取类型
收费全文 | 2819篇 |
免费 | 188篇 |
国内免费 | 5篇 |
专业分类
电工技术 | 13篇 |
综合类 | 2篇 |
化学工业 | 906篇 |
金属工艺 | 18篇 |
机械仪表 | 56篇 |
建筑科学 | 129篇 |
能源动力 | 56篇 |
轻工业 | 580篇 |
水利工程 | 36篇 |
石油天然气 | 9篇 |
无线电 | 135篇 |
一般工业技术 | 433篇 |
冶金工业 | 298篇 |
原子能技术 | 8篇 |
自动化技术 | 333篇 |
出版年
2024年 | 11篇 |
2023年 | 69篇 |
2022年 | 211篇 |
2021年 | 255篇 |
2020年 | 106篇 |
2019年 | 117篇 |
2018年 | 138篇 |
2017年 | 111篇 |
2016年 | 107篇 |
2015年 | 116篇 |
2014年 | 111篇 |
2013年 | 195篇 |
2012年 | 172篇 |
2011年 | 217篇 |
2010年 | 124篇 |
2009年 | 143篇 |
2008年 | 121篇 |
2007年 | 123篇 |
2006年 | 87篇 |
2005年 | 72篇 |
2004年 | 55篇 |
2003年 | 51篇 |
2002年 | 38篇 |
2001年 | 12篇 |
2000年 | 18篇 |
1999年 | 23篇 |
1998年 | 17篇 |
1997年 | 22篇 |
1996年 | 14篇 |
1995年 | 11篇 |
1994年 | 9篇 |
1993年 | 9篇 |
1992年 | 11篇 |
1990年 | 8篇 |
1989年 | 8篇 |
1988年 | 10篇 |
1987年 | 6篇 |
1986年 | 7篇 |
1985年 | 9篇 |
1984年 | 5篇 |
1983年 | 8篇 |
1982年 | 7篇 |
1981年 | 4篇 |
1977年 | 6篇 |
1976年 | 4篇 |
1975年 | 3篇 |
1973年 | 4篇 |
1972年 | 3篇 |
1964年 | 3篇 |
1958年 | 2篇 |
排序方式: 共有3012条查询结果,搜索用时 15 毫秒
51.
Kolden Gregory G.; Klein Marjorie H.; Wang Chia-Chiang; Austin Sara B. 《Canadian Metallurgical Quarterly》2011,48(1):65
Congruence or genuineness is a relational quality that has been highly prized throughout the history of psychotherapy, but of diminished research interest in recent years. In this article, we define and provide examples of this attribute of the therapy relationship and present an original meta-analytic review of the empirical literature showing its relation to improvement. Analysis of 16 studies (k), representing 863 patients (N), resulted in a weighted aggregate ES (r) of .24 (p = .003; 95% CI = .12 to .36). Moderators of the association between congruence and treatment outcome are examined, and limitations of the extant research are discussed as well. In closing, we advance several therapist practices that are likely to foster congruence and thus improve psychotherapy outcomes. (PsycINFO Database Record (c) 2011 APA, all rights reserved) 相似文献
52.
Remez Robert E.; Dubowski Kathryn R.; Broder Robin S.; Davids Morgana L.; Grossman Yael S.; Moskalenko Marina; Pardo Jennifer S.; Hasbun Sara Maria 《Canadian Metallurgical Quarterly》2011,37(3):968
Speech remains intelligible despite the elimination of canonical acoustic correlates of phonemes from the spectrum. A portion of this perceptual flexibility can be attributed to modulation sensitivity in the auditory-to-phonetic projection, although signal-independent properties of lexical neighborhoods also affect intelligibility in utterances composed of words. Three tests were conducted to estimate the effects of exposure to natural and sine-wave samples of speech in this kind of perceptual versatility. First, sine-wave versions of the easy and hard word sets were created, modeled on the speech samples of a single talker. The performance difference in recognition of easy and hard words was used to index the perceptual reliance on signal-independent properties of lexical contrasts. Second, several kinds of exposure produced familiarity with an aspect of sine-wave speech: (a) sine-wave sentences modeled on the same talker; (b) sine-wave sentences modeled on a different talker, to create familiarity with a sine-wave carrier; and (c) natural sentences spoken by the same talker, to create familiarity with the idiolect expressed in the sine-wave words. Recognition performance with both easy and hard sine-wave words improved after exposure only to sine-wave sentences modeled on the same talker. Third, a control test showed that signal-independent uncertainty is a plausible cause of differences in recognition of easy and hard sine-wave words. The conditions of beneficial exposure reveal the specificity of attention underlying versatility in speech perception. (PsycINFO Database Record (c) 2011 APA, all rights reserved) 相似文献
53.
54.
Gabriela E. Viacava Sara I. Roura Mar��a Victoria Ag��ero 《Food Analytical Methods》2011,4(3):307-312
When determining the water status of leafy vegetables with oven-drying techniques, consumption of time and resources is inevitable. The aim of this work was to evaluate the performance of both relative water content (RWC) and free water and bound water content (FW–BW) techniques to obtain the water content index (WC) of different leafy vegetables in order to dispense with the traditional methodology for water content determination. By doing this, not only consumption of time is reduced, but also skilled labor and laboratory resources. Butterhead lettuces harvested at different growing stages and stored at different postharvest conditions were evaluated. In all cases, water content values obtained with RWC technique were statistically equivalent to those obtained with the traditional methodology. Instead, water content values obtained with FW–BW technique were considerably higher than the original WC. Consequently, using RWC technique data to obtain water content, the time required to determine water status in butterhead lettuce is reduced by 25%. In addition, fresh plants of swiss chard, akusay (chinese cabbage), and romaine lettuce were evaluated in order to validate the simplified methodology. Results obtained were similar to those observed for butterhead lettuce. 相似文献
55.
Mina Khorami Saeed Hesaraki Aliasghar Behnamghader Hamid Nazarian Sara Shahrabi 《Materials science & engineering. C, Materials for biological applications》2011,31(7):1584-1592
In this study, different concentrations of Li2O (0–12 wt.%) were substituted for Na2O in 45S5 bioglass® and the effect of these substitutions on both in vitro apatite formation ability and osteoblastic cell responses was studied. For these purposes, the structural and topographical properties of the glasses were studied using, XRD, FTIR, SEM/EDXA and AFM techniques, before and after storing in simulated body fluid for different time intervals. Additionally, the proliferation rate and activity of newborn rat calvaria-derived osteoblastic cells on different samples were examined by using dimethylthiazol diphenyl tetrazolium bromide (MTT) and alkaline phosphatase (ALP) assessment methods. From XRD and FTIR data, it was found that poor crystalline carbonated nanoapatite phase was formed on the surface of glasses with maximum concentration of Li or without Li, while at low substitutions an inhibition of apatite formation was observed. The apatite layer formed on the surfaces of the glasses had similar morphology, flakes which tightly entangled to others. All samples had the same surface roughness before soaking but different values after that. It was found that both proliferation rate and alkaline phosphatase activity of the cells cultured on Li-substituted glasses were higher than those of Li-free sample in a dose-dependent manner. The results suggest that lithia-modified glasses may be successfully used as bone defect filler even with more effectiveness than 45S5 bioglass®. 相似文献
56.
When public opposition defeats alternative water projects - The case of Toowoomba Australia 总被引:1,自引:0,他引:1
Located approximately 100 km west of Brisbane, Toowoomba is home to approximately 95,000 people. Surface water from dams is the main source of water for the city. In 2006 the residents of Toowoomba were invited to vote in a referendum (plebiscite) concerning whether or not an indirect potable wastewater reuse scheme should be constructed to supply additional water to the area. At that stage dam levels in Toowoomba were at approximately twenty percent of capacity. Toowoomba residents, after intense campaigning on both sides of the referendum debate, voted against the proposal. In July 2008 dam levels dropped to eleven percent. Stage 5 water restrictions have been in place since September 2006, subsequently mains water must not be used for any outdoor uses. This paper describes in detail how public opposition in the case of Toowoomba's referendum, defeated the proposal for a water augmentation solution. Reasons for the failure are analysed. In so doing, the paper provides valuable insights with respect to public participation in indirect potable reuse proposals, and discusses factors including politics, vested interest and information manipulation. This paper is significant because of the lack of detailed information published about failed water infrastructure projects. 相似文献
57.
Kanter Jonathan W.; Rusch Laura C.; Landes Sara J.; Holman Gareth I.; Whiteside Ursula; Sedivy Sonja K. 《Canadian Metallurgical Quarterly》2009,46(2):220
To improve cognitive and behavioral therapies (CBT) for depression, several approaches recommend an increased focus on the occurrence of problems as they occur in the therapeutic relationship or in relation to the live therapy process, referred to as present-focused. A lingering question has been the degree to which CBT therapists already engage in present-focused work. This study utilized sessions from recent trials of CBT for depression and, in Phase I, raters identified present-focused interventions on a turn-by-turn basis. Phase II raters used a qualitative analysis to determine categories of present-focused interventions. Results indicated that therapists rarely focused on the therapeutic relationship; when they did, it was often transient and lacking in the elaborations suggested by newer approaches. Therapists more often performed therapy process and emotion focused interventions, but these also tended to lack elaboration. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
58.
59.
60.