全文获取类型
收费全文 | 3196篇 |
免费 | 73篇 |
专业分类
电工技术 | 24篇 |
综合类 | 5篇 |
化学工业 | 609篇 |
金属工艺 | 47篇 |
机械仪表 | 74篇 |
建筑科学 | 154篇 |
矿业工程 | 8篇 |
能源动力 | 114篇 |
轻工业 | 341篇 |
水利工程 | 29篇 |
石油天然气 | 16篇 |
武器工业 | 1篇 |
无线电 | 264篇 |
一般工业技术 | 433篇 |
冶金工业 | 764篇 |
原子能技术 | 33篇 |
自动化技术 | 353篇 |
出版年
2023年 | 11篇 |
2022年 | 22篇 |
2021年 | 18篇 |
2020年 | 22篇 |
2019年 | 23篇 |
2018年 | 38篇 |
2017年 | 42篇 |
2016年 | 45篇 |
2015年 | 33篇 |
2014年 | 65篇 |
2013年 | 196篇 |
2012年 | 126篇 |
2011年 | 179篇 |
2010年 | 156篇 |
2009年 | 136篇 |
2008年 | 173篇 |
2007年 | 194篇 |
2006年 | 159篇 |
2005年 | 123篇 |
2004年 | 103篇 |
2003年 | 87篇 |
2002年 | 81篇 |
2001年 | 59篇 |
2000年 | 56篇 |
1999年 | 84篇 |
1998年 | 80篇 |
1997年 | 70篇 |
1996年 | 57篇 |
1995年 | 62篇 |
1994年 | 66篇 |
1993年 | 60篇 |
1992年 | 53篇 |
1991年 | 30篇 |
1990年 | 47篇 |
1989年 | 44篇 |
1988年 | 34篇 |
1987年 | 40篇 |
1986年 | 36篇 |
1985年 | 49篇 |
1984年 | 48篇 |
1983年 | 45篇 |
1982年 | 26篇 |
1981年 | 32篇 |
1980年 | 10篇 |
1979年 | 28篇 |
1978年 | 12篇 |
1977年 | 18篇 |
1976年 | 17篇 |
1975年 | 12篇 |
1973年 | 10篇 |
排序方式: 共有3269条查询结果,搜索用时 0 毫秒
1.
Argues that while there is potential for successful blending of 12-step approaches and psychotherapies for chemical dependency at the level of helping strategies/techniques, some basic differences in values and philosophy will make it impossible to ever fully integrate the 2 approaches without compromising one or the other approach. Some of the differences between the 2 approaches involve leadership (indigenous vs professional), individual control (increasing vs decreasing), and spirituality (enhanced vs decreased). Given that psychotherapy and the 12-step approach must remain largely independent, a model for interactions based on mutual respect, independent control, and cooperation is suggested. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
2.
Ahn Jaeshin Stromsmoe Keith A. Lawson Ronald P. W. 《Industrial Electronics, IEEE Transactions on》1985,(4):405-409
A microprocessor-based system with 32 A/D, 24 D/A, and 16 ac load controllers, has been designed and built to monitor and control an ion beam thin-film deposition system. The A/D and D/A channels have electrical isolation of 7.5 kV between channels and between input and output. The microprocessor system keeps the ion beam deposition parameters stable for extended periods of operation and it is proposed as a means to greatly simplify switching from one deposition species to another to grow thin multilayer or alloy films. 相似文献
3.
The requirements on an object-oriented DBMS for management of information in a large, complex enterprise are presented. These requirements aid in the achievement of an environment characterized by data sharing, open architectures, application and data portability, and assurance of data integrity. They were defined from the point of view of a user of the DBMS; therefore they describe the expected functionality of the DBMS and do not specify the method of implementation to achieve this functionality. They encompass requirements on the data model, query and data manipulation languages, the system architecure, interfaces to the system, change management, and transaction management. 相似文献
4.
5.
6.
Learning Organizations in Construction 总被引:1,自引:0,他引:1
The transformation of organizations from production-oriented entities to proactive learning entities that continuously leverage the knowledge of the workforce is a primary objective of management researchers. This focus has significant relevance to the construction industry where production-related research has predominantly overshadowed organizational development research. As one effort to change this emphasis, the writers present a research effort designed to study current organization learning techniques and technologies fielded by organizations both inside and outside of the construction industry. Through a series of exploratory case studies, the writers developed a maturity model together with the Construction Industry Institute that provides construction organizations with a framework for developing a learning organization culture. The maturity model focuses on learning organization characteristics of leadership, processes and infrastructure, communication/collaboration, education, and culture at the organization, community, and individual levels. This paper introduces the results of that effort including a presentation of the learning organization maturity model, framework application, and the overall characteristics of a learning organization. 相似文献
7.
We cloned the Saccharomyces kluyveri HIS3 homolog, k-HIS3, and made a partial deletion of the gene. The k-HIS3 gene complemented a HIS3 deletion in S. cerevisiae. The DNA sequences of the open reading frames (ORFs) of the HIS3 homologs are 70% identical at the DNA level and 83% identical at the deduced amino acid level. The ORF upstream of the k-HIS3 gene is related to the PET56 gene of S. cerevisiae found upstream of the HIS3 gene of S. cerevisiae. The ORF downstream from the k-HIS3 gene is not related to the DED1 gene found downstream of the HIS3 gene in S. cerevisiae. 相似文献
8.
9.
10.
Staub Adrian; Rayner Keith; Pollatsek Alexander; Hy?n? Jukka; Majewski Helen 《Canadian Metallurgical Quarterly》2007,33(6):1162
Readers' eye movements were monitored as they read sentences containing noun-noun compounds that varied in frequency (e.g., elevator mechanic, mountain lion). The left constituent of the compound was either plausible or implausible as a head noun at the point at which it appeared, whereas the compound as a whole was always plausible. When the head noun analysis of the left constituent was implausible, reading times on this word were inflated, beginning with the first fixation. This finding is consistent with previous demonstrations of very rapid effects of plausibility on eye movements. Compound frequency did not modulate the plausibility effect, and all disruption was resolved by the time readers' eyes moved to the next word. These findings suggest (contra Kennison, 2005) that the parser initially analyzes a singular noun as a head instead of a modifier. In addition, the findings confirm that the very rapid effect of plausibility on eye movements is not due to strategic factors, because in the present experiment, unlike in previous demonstrations, this effect appeared in sentences that were globally plausible. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献