全文获取类型
收费全文 | 903篇 |
免费 | 7篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 4篇 |
化学工业 | 83篇 |
金属工艺 | 1篇 |
机械仪表 | 3篇 |
建筑科学 | 72篇 |
矿业工程 | 4篇 |
能源动力 | 21篇 |
轻工业 | 47篇 |
水利工程 | 6篇 |
石油天然气 | 1篇 |
无线电 | 80篇 |
一般工业技术 | 54篇 |
冶金工业 | 474篇 |
原子能技术 | 9篇 |
自动化技术 | 52篇 |
出版年
2022年 | 3篇 |
2021年 | 5篇 |
2018年 | 4篇 |
2017年 | 6篇 |
2016年 | 4篇 |
2013年 | 23篇 |
2012年 | 8篇 |
2011年 | 13篇 |
2010年 | 11篇 |
2009年 | 18篇 |
2008年 | 13篇 |
2007年 | 11篇 |
2006年 | 26篇 |
2005年 | 18篇 |
2004年 | 22篇 |
2003年 | 18篇 |
2002年 | 16篇 |
2001年 | 11篇 |
2000年 | 13篇 |
1999年 | 18篇 |
1998年 | 105篇 |
1997年 | 70篇 |
1996年 | 55篇 |
1995年 | 43篇 |
1994年 | 30篇 |
1993年 | 30篇 |
1992年 | 13篇 |
1991年 | 14篇 |
1990年 | 8篇 |
1989年 | 13篇 |
1988年 | 13篇 |
1987年 | 12篇 |
1986年 | 13篇 |
1985年 | 12篇 |
1984年 | 9篇 |
1983年 | 15篇 |
1982年 | 18篇 |
1981年 | 18篇 |
1980年 | 15篇 |
1979年 | 20篇 |
1978年 | 3篇 |
1977年 | 16篇 |
1976年 | 33篇 |
1975年 | 9篇 |
1974年 | 7篇 |
1973年 | 5篇 |
1972年 | 5篇 |
1971年 | 7篇 |
1970年 | 5篇 |
1963年 | 3篇 |
排序方式: 共有911条查询结果,搜索用时 17 毫秒
51.
52.
Discusses S. Garfield, R. Prager, and A. Bergin's (see pa, vol. 47:issue 5) finding of little relationship among criteria and most change on global ratings of improvement which they believe are the most biased. Values of the global improvement ratings are discussed. Patient and therapist (and supervisor) have intimate knowledge of the specific areas needing change; many other measures are nonspecific or insensitive to change, and since therapeutic gains may be small, intercorrelations among criteria may be limited. Some of the statistics are questioned: raw gain scores are of questionable value; the relative importance of changes on the "other measures" is unclear; and considering the unreliability of single item ratings, the amount of the interrelationship among different criteria is not to be dismissed as slight. Furthermore, rotation of their factor matrix showed patient, therapist, and supervisor ratings of change loading the same factor. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
53.
In this study an indirect adaptive sliding mode control (SMC) based on a fuzzy logic scheme is proposed to strengthen the tracking control performance of a general class of multi-input multi-output (MIMO) nonlinear uncertain systems. Combining reaching law approach and fuzzy universal approximation theorem, the proposed design procedure combines the advantages of fuzzy logic control, adaptive control and sliding mode control. The stability of the control systems is proved in the sense of the Lyapunov second stability theorem. Two simulation studies are presented to demonstrate the effectiveness of our new hybrid control algorithm. 相似文献
54.
Examines some of the more frequent concerns and criticisms about rational–emotive therapy, including issues of relationship factors, emotive aspects, values, religious concerns, and intervention techniques and styles in therapy. (20 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
55.
56.
Took telemetric recordings of a male 23-yr-old chronic schizophrenic patient's heart rate and skin potential while on the ward. During periods of hallucinations, the skin potential increased significantly, while there were no changes in heart rate. Neither heart rate nor skin potential increased during periods of talking. When very angry, heart rate showed a substantial deceleration followed by a large increase. There was no change in skin potential during the period of anger. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
57.
58.
By reducing the energy and materials required to provide goods and services, nanotechnology has the potential to provide more appealing products while improving environmental performance and sustainability. Whether and how soon this potential could be realized depends on phrasing the right research and development (R&D) questions and pursuing commercialization intelligently. A sufficiently broad perspective at the outset is required to understand economic and technical feasibility, estimate life cycle environmental implications, and minimize unanticipated negative impacts. The rapid rise in federally funded nanotechnology R&D dictates that consideration of societal benefits will have a large role in setting the R&D agenda. We estimate potential selected economic and environmental impacts associated with the use of nanotechnology in the automotive industry. In particular, we project the material processing and fuel economy benefits associated with using a clay-polypropylene nanocomposite instead of steel or aluminum in light-duty vehicle body panels. Although the manufacturing cost is currently higher, a life cycle analysis shows potential benefits in reducing energy use and environment discharges by using a nanocomposite design. 相似文献
59.
Gaze-contingent multiresolutional displays (GCMRDs) center high-resolution information on the user's gaze position, matching the user's area of interest (AOI). Image resolution and details outside the AOI are reduced, lowering the requirements for processing resources and transmission bandwidth in demanding display and imaging applications. This review provides a general framework within which GCMRD research can be integrated, evaluated, and guided. GCMRDs (or "moving windows") are analyzed in terms of (a) the nature of their images (i.e., "multiresolution," "variable resolution," "space variant," or "level of detail"), and (b) the movement of the AOI (i.e., "gaze contingent," "foveated," or "eye slaved"). We also synthesize the known human factors research on GCMRDs and point out important questions for future research and development. Actual or potential applications of this research include flight, medical, and driving simulators; virtual reality; remote piloting and teleoperation; infrared and indirect vision; image transmission and retrieval; telemedicine; video teleconferencing; and artificial vision systems. 相似文献
60.
As we reflect on the concept of critical thinking in perioperative nursing practice, we should ask ourselves whether we think critically. If not, we must learn the principles of critical thinking and apply them in our clinical practice settings. Our perioperative nurse managers and directors must demonstrate critical thinking in leading other nurses in the delivery of quality, cost-effective, service-oriented patient care. They also must identify peers who use critical thinking skills to support and sustain them in their quest. 相似文献