全文获取类型
收费全文 | 3282篇 |
免费 | 118篇 |
国内免费 | 3篇 |
专业分类
电工技术 | 26篇 |
综合类 | 2篇 |
化学工业 | 585篇 |
金属工艺 | 31篇 |
机械仪表 | 63篇 |
建筑科学 | 144篇 |
矿业工程 | 1篇 |
能源动力 | 62篇 |
轻工业 | 418篇 |
水利工程 | 34篇 |
石油天然气 | 10篇 |
无线电 | 192篇 |
一般工业技术 | 479篇 |
冶金工业 | 1004篇 |
原子能技术 | 11篇 |
自动化技术 | 341篇 |
出版年
2023年 | 30篇 |
2022年 | 62篇 |
2021年 | 83篇 |
2020年 | 58篇 |
2019年 | 57篇 |
2018年 | 57篇 |
2017年 | 66篇 |
2016年 | 49篇 |
2015年 | 77篇 |
2014年 | 87篇 |
2013年 | 153篇 |
2012年 | 123篇 |
2011年 | 176篇 |
2010年 | 131篇 |
2009年 | 119篇 |
2008年 | 152篇 |
2007年 | 175篇 |
2006年 | 141篇 |
2005年 | 120篇 |
2004年 | 113篇 |
2003年 | 90篇 |
2002年 | 77篇 |
2001年 | 49篇 |
2000年 | 55篇 |
1999年 | 64篇 |
1998年 | 128篇 |
1997年 | 81篇 |
1996年 | 100篇 |
1995年 | 53篇 |
1994年 | 56篇 |
1993年 | 55篇 |
1992年 | 26篇 |
1990年 | 30篇 |
1989年 | 26篇 |
1988年 | 26篇 |
1987年 | 24篇 |
1986年 | 24篇 |
1985年 | 36篇 |
1984年 | 20篇 |
1983年 | 34篇 |
1982年 | 25篇 |
1981年 | 23篇 |
1980年 | 15篇 |
1979年 | 20篇 |
1978年 | 28篇 |
1977年 | 23篇 |
1976年 | 40篇 |
1975年 | 18篇 |
1974年 | 19篇 |
1973年 | 21篇 |
排序方式: 共有3403条查询结果,搜索用时 15 毫秒
1.
The Intellectual Development of Science and Engineering Students. Part 2: Teaching to Promote Growth
As college students experience the challenges of their classes and extracurricular activities, they undergo a developmental progression in which they gradually relinquish their belief in the certainty of knowledge and the omniscience of authorities and take increasing responsibility for their own learning. At the highest developmental level normally seen in college students (which few attain before graduation), they display attitudes and thinking patterns resembling those of expert scientists and engineers, including habitually and skillfully gathering and analyzing evidence to support their judgments. This paper proposes an instructional model designed to provide a suitable balance of challenge and support to advance students to that level. The model components are (1) variety and choice of learning tasks; (2) explicit communication and explanation of expectations; (3) modeling, practice, and constructive feedback on high‐level tasks; (4) a student‐centered instructional environment; and (5) respect for students at all levels of development. 相似文献
2.
Barch Deanna M.; Mitropoulou Vivian; Harvey Philip D.; New Antonia S.; Silverman Jeremy M.; Siever Larry J. 《Canadian Metallurgical Quarterly》2004,113(4):556
Research suggests that schizotypal personality disorder (SPD) is a part of the spectrum of schizophrenia-related illnesses. This article hypothesizes that a deficit in the representation and maintenance of context is a core cognitive disturbance in schizophrenia and that SPD individuals should demonstrate context-processing deficits. To test this hypothesis, the authors administered 3 versions of their AX-CPT task, designed to assess context processing, to 35 healthy controls and 26 individuals with DSM-IV SPD. They also administered working memory and selective attention tasks. SPD individuals displayed context representation deficits similar to those found in schizophrenia but did not show the same additional deficits in context maintenance. Context processing was strongly associated with working memory and selective attention performance in the SPD individuals. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
3.
4.
According to Carl Jung, a person's symptoms occur as a result of the psyche's creative attempt to self-regulate. These symptoms are viewed as the symbol-making function of the psyche. Music therapy as a therapeutic tool is also viewed as having a symbol-making function in that the physical act of making music involves conceptualizing one's symptoms into sounds. The sound serves as a musical symbol of the symptom. The myth of Orpheus is offered as an example of how early man amplified the creative potential contained in music to heal from life's woes. The Orphic archetype illustrates that music serves as a medium for healing and as an expression of Self. That psyche can be healed by music is a reminder of the connection between music therapy and the myth of Orpheus. In using the therapeutic tool of music one can transcend, through the symbol making process inherent in music therapy, the tension of opposites that are created at the crossroads of disease and wellness. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
5.
6.
There is a growing trend of research in neuropsychological assessment in Asia: The mean number of published studies increased from 1.8 in the 1980s to 16.0 in 2 recent years. About 40% of the studies reviewed concerned test development or adaptation, with the latter greatly outnumbering the former. To facilitate the test selection for clinical use, 36 clinical measures were evaluated based on some statistical criteria. The results showed that only 8 neuropsychological tests (5 Chinese. 2 Korean, and 1 Japanese) met the criteria. Given that Asian and Western populations differ on certain cognitive processes, future development of neuropsychological assessment measures in Asia should move from the adaptation of Western tests toward the construction of original tests with better ecological validity. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
7.
This paper presents the results of tensile tests on viscoelastic films of two materials: a 100 pen bitumen and a commercial corn syrup. Experiments were performed using double-cantilever beam specimens, and butt-joint specimens, for a wide range of testing conditions. Failure by brittle fracture, voiding, and various viscous flow mechanisms was observed. The results are presented in the form of maps and are discussed in conjunction with appropriate mathematical models. 相似文献
8.
Remote center‐of‐compliance devices were developed to facilitate insertion for assembly operations. An analysis using screw theory yields a more accurate model to better characterize the interesting properties of remote compliance. For design purposes, the remote center location and stiffnesses are presented as nondimensional ratios that are only functions of geometrical properties and Poisson's ratio. Important design results are (i) the high sensitivity of the center location and (ii) the inverse relationship between linear and angular lateral stiffnesses. © 2003 Wiley Periodicals, Inc. 相似文献
9.
Beutler Larry E.; Williams Rebecca E.; Wakefield Phylis J.; Entwistle Stephanie R. 《Canadian Metallurgical Quarterly》1995,50(12):984
Literature suggests that a complex and often hostile relationship exists between the science and practice of clinical psychology. Contributors to this conflict of viewpoints are reconsidered within the proposition that there are different roads to discovery and that there may be good reasons to keep the science and practice of clinical psychology somewhat separate. Results of a national survey of 325 psychologists are reviewed that support the view that psychological practitioners value research and consider their practices to be augmented by scientific findings. However, they are in need of vehicles of communication that will help them translate scientific findings into practice. Results suggest that practitioners do more to understand scientific findings than scientists do to understand the problems that face clinical practitioners. Ways to facilitate communication between and among these groups are considered. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
10.