全文获取类型
收费全文 | 346篇 |
免费 | 3篇 |
专业分类
电工技术 | 22篇 |
综合类 | 1篇 |
化学工业 | 62篇 |
金属工艺 | 4篇 |
机械仪表 | 5篇 |
建筑科学 | 17篇 |
矿业工程 | 3篇 |
能源动力 | 43篇 |
轻工业 | 17篇 |
水利工程 | 2篇 |
石油天然气 | 2篇 |
无线电 | 20篇 |
一般工业技术 | 28篇 |
冶金工业 | 91篇 |
自动化技术 | 32篇 |
出版年
2022年 | 2篇 |
2021年 | 4篇 |
2018年 | 6篇 |
2017年 | 1篇 |
2015年 | 5篇 |
2014年 | 2篇 |
2013年 | 22篇 |
2012年 | 8篇 |
2011年 | 7篇 |
2010年 | 14篇 |
2009年 | 8篇 |
2008年 | 11篇 |
2007年 | 14篇 |
2006年 | 8篇 |
2005年 | 4篇 |
2004年 | 8篇 |
2003年 | 1篇 |
2002年 | 6篇 |
2001年 | 6篇 |
2000年 | 7篇 |
1999年 | 2篇 |
1998年 | 23篇 |
1997年 | 10篇 |
1996年 | 17篇 |
1995年 | 8篇 |
1994年 | 6篇 |
1993年 | 10篇 |
1992年 | 9篇 |
1991年 | 7篇 |
1990年 | 8篇 |
1989年 | 9篇 |
1988年 | 8篇 |
1987年 | 5篇 |
1986年 | 6篇 |
1985年 | 10篇 |
1984年 | 7篇 |
1983年 | 6篇 |
1982年 | 9篇 |
1981年 | 5篇 |
1980年 | 6篇 |
1979年 | 3篇 |
1977年 | 3篇 |
1976年 | 7篇 |
1975年 | 2篇 |
1973年 | 7篇 |
1972年 | 3篇 |
1971年 | 3篇 |
1968年 | 1篇 |
1967年 | 1篇 |
1955年 | 1篇 |
排序方式: 共有349条查询结果,搜索用时 15 毫秒
61.
Wiener Richard L.; Rogers Melanie; Winter Ryan; Hurt Linda; Hackney Amy; Kadela Karen; Seib Hope; Rauch Shannon; Warren Laura; Morasco Ben 《Canadian Metallurgical Quarterly》2004,10(4):516
This article analyzes whether state-approved jury instructions adequately guide jury discretion in the penalty phase of first-degree murder trials. It examines Eighth Amendment jurisprudence regarding guided jury discretion, emphasizing the use of "empirical factors" to examine the quality of state-approved instructions. Psychological research and testimony on the topic of the comprehensibility of jury logical instructions are reviewed. Data from a recently completed simulation with 80 deliberating juries showed that current instructions do not adequately convey the concepts and processes essential to guiding penalty phase judgments. An additional simulation with 20 deliberating juries demonstrated that deliberation alone does not correct for jurors' errors in comprehension. The article concludes with recommendations for policy and future research. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
62.
State space modelling and synthesis of decentralized suboptimal load-frequency control for hydro-thermal power systems are described in this paper. The state space models are derived by the partial fraction technique for reheat steam turbines, hydro turbines and hydro governors having numerator dynamics. Decentralized suboptimal load-frequency controls are synthesized by using the method of minimum error excitation and their performance is analysed as a function of tie-line power level. It is shown that the suboptimal control with feedback of some, but not all, of the remote area state variables is a feasible alternative to the optimal control, whereas local control without feedback of any remote state variable is inadequate for stabilizing the system. 相似文献
63.
64.
A method of modeling, involving approximation of dead-times, is presented for diesel driven power prime-movers. The resulting predictive adaptive control scheme is compared to a conventional PI scheme on the basis of common disturbances encountered by a practical prime-mover. It is found that the adaptive scheme achieves significant improvement despite the nonlinearities introduced by turbocharger operation. It is observed in general that adaptive schemes, such as the one described, affect the prime-mover dynamics in essentially two ways. First, the engine fuel-flow response is improved by better control of the actuator. Secondly, by indirectly controlling the exhaust energy of the plant, the turbocharger air-dynamics is made faster, leading to better dynamic fuel/air ratio. The overall effect is good response of the prime-mover speed notwithstanding the fact that the diesel prime-mover is a low inertia structure and that the system parameters suffer from various nonlinear variations 相似文献
65.
Social phobia and avoidant personality disorder (APD) may be given as comorbid diagnoses. However, it is not known if the labels provide independent, useful diagnostic information. The authors classified social phobics by social phobia subtype and presence of APD. Generalized social phobics with and without APD (ns?=?10 and 10) and nongeneralized social phobics without APD (n?=?10) were distinguished on measures of phobic severity. The generalized groups also showed earlier age at onset and higher scores on measures of depression, fear of negative evaluation, and social anxiety and avoidance than did the nongeneralized group. APD criteria of general timidity and risk aversion were more frequently endorsed by social phobics with AD. The data suggest that both the generalized subtype of social phobia and the presence of APD do provide useful diagnostic information, but the additional diagnosis of APD may simply identify a severe subgroup of social phobics. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
66.
Measurements have been made of the sorption and diffusion coefficients of various solvents in oriented linear polyethylene pipe produced by hydrostatic extrusion. In all cases the equilibrium sorption is a factor of about ten less than that for isotropic linear polyethylene, and the diffusion coefficients are a factor of about a hundred less. 相似文献
67.
Mills Rosemary S. L.; Imm Gorette P.; Walling Bobbi R.; Weiler Hope A. 《Canadian Metallurgical Quarterly》2008,44(5):1369
The purpose of this study was to characterize cortisol response and regulation associated with shame responding in early childhood and to examine how general the relation between shame and cortisol is. It was predicted that children responding to task failure with shame would show a larger and more prolonged cortisol response than other children. Participants were 214 children (124 boys, 90 girls) ranging from 3.7 to 4.5 years of age (M = 4.14 years, SD = 0.24). Shame responding was assessed from children's emotion-expressive behavior in response to failing 6 performance tasks, 2 preceding (initial) and 4 following (subsequent) assessment of hypothalamic-pituitary-adrenal axis activation. Cortisol response and regulation associated with failure were assessed from saliva sampled before and 15, 20, 25, 30, and 40 min following the first of the 2 initial failures. For boys and for some girls, high initial shame was associated with greater cortisol reactivity and slower regulation of the cortisol response. For boys, high initial shame and relatively slow regulation of the associated cortisol response predicted subsequent shame responding occurring after recovery of the cortisol response. For girls, high initial shame, but not cortisol response, predicted subsequent shame responding. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
68.
The Stern Review received widespread attention for its innovative approach to the economics of climate change when it appeared in 2006, and generated controversies that have continued to this day. One key controversy concerns the magnitude of the expected impacts of climate change. Stern's estimates, based on results from the PAGE2002 model, sounded substantially greater than those produced by many other models, leading several critics to suggest that Stern had inflated his damage figures. 相似文献
69.
Rekha Kengeri Cheryl D. Seals Hope D. Harley Himabindu P. Reddy Edward A. Fox 《International Journal on Digital Libraries》1999,2(2-3):157-169
If digital libraries are to be used effectively, their user interfaces should be tested and enhanced. We observed 48 participants
as they worked with the following digital libraries: ACM, IEEE-CS, NCSTRL, and NDLTD. We discuss how the features of these
digital libraries influence the subjects’ efforts to perform search and retrieval tasks. Data analysis indicates that the
IEEE-CS digital library was rated the best overall and NDLTD had the best search time. We present user recommendations and
propose a taxonomy of features that we believe are essential for the design of future digital libraries. Noteworthy is the
observation that users’ judgements on the importance of different features varied widely between the beginning and end of
their test sessions.
Received: 15 December 1997 / Revised: June 1999 相似文献
70.
Ernesto Solorzano Andrew L. Alejo Hope C. Ball Joseph Magoline Yusuf Khalil Michael Kelly Fayez F. Safadi 《International journal of molecular sciences》2022,23(15)
Complex Lymphatic Anomalies (CLA) are lymphatic malformations with idiopathic bone and soft tissue involvement. The extent of the abnormal lymphatic presentation and boney invasion varies between subtypes of CLA. The etiology of these diseases has proven to be extremely elusive due to their rarity and irregular progression. In this review, we compiled literature on each of the four primary CLA subtypes and discuss their clinical presentation, lymphatic invasion, osseous profile, and regulatory pathways associated with abnormal bone loss caused by the lymphatic invasion. We highlight key proliferation and differentiation pathways shared between lymphatics and bone and how these systems may interact with each other to stimulate lymphangiogenesis and cause bone loss. 相似文献