全文获取类型
收费全文 | 615篇 |
免费 | 42篇 |
专业分类
电工技术 | 9篇 |
综合类 | 6篇 |
化学工业 | 156篇 |
金属工艺 | 12篇 |
机械仪表 | 12篇 |
建筑科学 | 29篇 |
能源动力 | 16篇 |
轻工业 | 93篇 |
水利工程 | 4篇 |
石油天然气 | 5篇 |
无线电 | 29篇 |
一般工业技术 | 87篇 |
冶金工业 | 71篇 |
原子能技术 | 2篇 |
自动化技术 | 126篇 |
出版年
2024年 | 2篇 |
2023年 | 11篇 |
2022年 | 25篇 |
2021年 | 25篇 |
2020年 | 17篇 |
2019年 | 18篇 |
2018年 | 18篇 |
2017年 | 15篇 |
2016年 | 30篇 |
2015年 | 17篇 |
2014年 | 25篇 |
2013年 | 39篇 |
2012年 | 50篇 |
2011年 | 52篇 |
2010年 | 32篇 |
2009年 | 40篇 |
2008年 | 33篇 |
2007年 | 21篇 |
2006年 | 17篇 |
2005年 | 24篇 |
2004年 | 13篇 |
2003年 | 15篇 |
2002年 | 17篇 |
2001年 | 8篇 |
2000年 | 7篇 |
1999年 | 10篇 |
1998年 | 10篇 |
1997年 | 8篇 |
1996年 | 5篇 |
1995年 | 10篇 |
1994年 | 3篇 |
1993年 | 4篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1988年 | 4篇 |
1987年 | 6篇 |
1986年 | 5篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1983年 | 3篇 |
1979年 | 3篇 |
1978年 | 1篇 |
1976年 | 2篇 |
1972年 | 1篇 |
1968年 | 1篇 |
排序方式: 共有657条查询结果,搜索用时 359 毫秒
41.
Based on the semantic equivalence degree the formal definitions of fuzzy functional dependencies (FFDs) and fuzzy multivalued dependencies (FMVDs) are first introduced to the fuzzy relational databases, where fuzziness of data appears in attribute values in the form of possibility attributions, as well as resemblance relations in attribute domain elements, called extended possibility‐based fuzzy relational databases. A set of inference rules for FFDs and FMVDs is then proposed. It is shown that FFDs and FMVDs are consistent and the inference rules are sound and complete, just as Armstrong's axioms for classic cases. © 2002 Wiley Periodicals, Inc. 相似文献
42.
Spence Susan H.; Holmes Jane M.; March Sonja; Lipp Ottmar V. 《Canadian Metallurgical Quarterly》2006,74(3):614
Seventy-two clinically anxious children, aged 7 to 14 years, were randomly allocated to clinic-based, cognitive-behavior therapy, the same treatment partially delivered via the Internet, or a wait-list control (WL). Children in the clinic and clinic-plus-Internet conditions showed significantly greater reductions in anxiety from pre- to posttreatment and were more likely to be free of their anxiety diagnoses, compared with the WL group. Improvements were maintained at 12-month follow-up for both therapy conditions, with minimal difference in outcomes between interventions. The Internet treatment content was highly acceptable to families, with minimal dropout and a high level of therapy compliance. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
43.
On the basis of absorption measurements in the near-infrared (NIR) spectral range, a new method for the quantification of the ethanol content of beer is presented. Instead of the multivariate calibration models most commonly employed in NIR spectroscopic works, we use interpretive difference spectroscopy: Two wavelengths are selected according to the assignment of the absorption bands of the main substances of content of beer in the NIR region, and the difference between the absorbances at these wavelengths is used for ethanol quantification. Absorption spectra of the dominating beer ingredients are discussed and the calibration procedure with ethanol/water mixtures is shown. Robustness against the carbohydrate content of beer samples was demonstrated by analyzing solutions of ethanol and maltose in water. Validation of the method was performed with various beer samples with an ethanol concentration range between 0.5 and 7.7 vol %. The pertinent advantage of the procedure developed in this work is the indication that the results are independent from seasonal variations of the ingredients, which is of high interest for products with natural ingredients such as beer. 相似文献
44.
45.
Lidija Mandic Sonja Grgic Mislav Grgic 《International journal of imaging systems and technology》2007,17(4):244-251
In this article, the corresponding‐color data for complex images reproduced on different media were obtained by simultaneous matching using an adjustment method. In our experiment printed color images and images displayed on a monitor were compared in different viewing conditions. The viewing condition varied in surround relative luminance and background. The experimental data show that surround relative luminance has little influence on color matching between printed and monitor images while changes in background modify color appearance. These results were used to evaluate different chromatic adaptation transforms (CAT). We found that for the same viewing conditions the SHARP transform shows the best agreement between the experimental and predicted data. SHARP transform can not predict accurately corresponding colors for blue and black regions. Therefore, we proposed new CAT that shows better characteristics than other transforms for cyan, green, and black colors and similar characteristics for other colors. © 2007 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 17, 244–251, 2007 相似文献
46.
Organizations should look at humans as multilayered, not only as professional entities. In synergy, not only individually, we define humans as: (1) physical, (2) mental, (3) social, (4) spiritual, and (5) economic entities, marked by requisitely holistic patterns of relatively permanent characteristics, due to which individuals differ from each other; they differ also as specialized professionals. All these and other attributes form synergies. On this basis, the behavior of individuals who are willing to practice interdisciplinary cooperation becomes socially responsible and they have a high level of well-being.Individuals as well as organizations seek requisite personal holism (RPH) on the one hand and psychic well-being (PWB) on the other hand. Thus, individuals implement individual techniques and organizations implement special strategies, programs, and actions in the frame of human resource management (HRM). That is how organizations in the frame of HRM, more specifically in the frame of management well-being, are developing special programs for managing PWB. These programs are based on their RPH and organizations might help employees to feel respected and valued in their work settings, without regard to their culture, religion, ethnicity, gender, age, disability, or other individual differences. The most-often applied programs of the kind include: (1) stress management programs, (2) diversity management programs, (3) wellness programs, (4) employee assistance programs, and (5) programs for personal growth. 相似文献
47.
Anis Ben Aissa Robert K. Abercrombie Frederick T. Sheldon Ali Mili 《Information Systems and E-Business Management》2012,10(4):433-453
In earlier work, we presented a value based measure of cybersecurity that quantifies the security of a system in concrete terms, specifically, in terms of how much each system stakeholder stands to lose (in dollars per hour of operation) as a result of security threats and system vulnerabilities; our metric varies according to the stakes that each stakeholder has in meeting each security requirement. In this paper, we discuss the specification and design of a system that collects, updates, and maintains all the information that pertains to estimating our cybersecurity measure, and offers stakeholders quantitative means to make security-related decisions. 相似文献
48.
Schwartz Barry; Ward Andrew; Monterosso John; Lyubomirsky Sonja; White Katherine; Lehman Darrin R. 《Canadian Metallurgical Quarterly》2002,83(5):1178
Can people feel worse off as the options they face increase? The present studies suggest that some people--maximizers--can. Study 1 reported a Maximization Scale, which measures individual differences in desire to maximize. Seven samples revealed negative correlations between maximization and happiness, optimism, self-esteem, and life satisfaction, and positive correlations between maximization and depression, perfectionism, and regret. Study 2 found maximizers less satisfied than nonmaximizers (satisficers) with consumer decisions, and more likely to engage in social comparison. Study 3 found maximizers more adversely affected by upward social comparison. Study 4 found maximizers more sensitive to regret and less satisfied in an ultimatum bargaining game. The interaction between maximizing and choice is discussed in terms of regret, adaptation, and self-blame. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
49.
50.
Hany H. Ammar Bojan Cukic Ali Mili Cris Fuhrman 《Annals of Software Engineering》2000,10(1-4):103-150
Today's digital systems are growing increasingly complex, and are being used in increasingly critical functions. The first
premise makes them more prone to contain faults, and the second premise makes their failure less tolerable. This widening
gap highlights the need for fault tolerant techniques, which make provisions for reliable operation of digital systems despite
the presence and occasional manifestation of faults. In this paper we present a brief comparative survey of fault tolerance
as it arises in hardware systems and software systems. We discuss logical models as well as statistical models of fault tolerance,
and use these models to analyze design tradeoffs of fault tolerant systems.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献