全文获取类型
收费全文 | 1214篇 |
免费 | 60篇 |
国内免费 | 47篇 |
专业分类
电工技术 | 26篇 |
技术理论 | 1篇 |
综合类 | 139篇 |
化学工业 | 32篇 |
金属工艺 | 17篇 |
机械仪表 | 127篇 |
建筑科学 | 147篇 |
矿业工程 | 55篇 |
能源动力 | 53篇 |
轻工业 | 19篇 |
水利工程 | 6篇 |
石油天然气 | 20篇 |
武器工业 | 13篇 |
无线电 | 46篇 |
一般工业技术 | 123篇 |
冶金工业 | 217篇 |
原子能技术 | 2篇 |
自动化技术 | 278篇 |
出版年
2024年 | 4篇 |
2023年 | 10篇 |
2022年 | 13篇 |
2021年 | 17篇 |
2020年 | 26篇 |
2019年 | 30篇 |
2018年 | 27篇 |
2017年 | 23篇 |
2016年 | 20篇 |
2015年 | 24篇 |
2014年 | 70篇 |
2013年 | 62篇 |
2012年 | 56篇 |
2011年 | 101篇 |
2010年 | 73篇 |
2009年 | 76篇 |
2008年 | 86篇 |
2007年 | 109篇 |
2006年 | 96篇 |
2005年 | 99篇 |
2004年 | 64篇 |
2003年 | 71篇 |
2002年 | 54篇 |
2001年 | 35篇 |
2000年 | 19篇 |
1999年 | 13篇 |
1998年 | 9篇 |
1997年 | 2篇 |
1996年 | 5篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1993年 | 5篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 3篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1982年 | 1篇 |
1979年 | 2篇 |
1958年 | 1篇 |
1954年 | 1篇 |
排序方式: 共有1321条查询结果,搜索用时 500 毫秒
121.
122.
《Urban Water Journal》2013,10(5):343-352
ABSTRACTThe Infrastructure Value Index (IVI) is quickly becoming a standard as a valuable tool to quickly assess the state of urban water infrastructure. However, its simple nature (as a single metric) can mask some valuable information and lead to erroneous conclusions. This paper introduces two complementary tools to IVI: The Infrastructure Degradation Index (IDI) and the Infrastructure Histogram (HI). The IDI is focused on time (compared to the IVI, focused on value), represents an intuitive concept and behaves in a linear way. The joint analysis of IVI and IDI provides results in a more complete understanding of the state of the assets, while maintaining the simplicity of the tools. The Infrastructure Histogram allows for a full evaluation of the infrastructure state and provides a detailed picture of network age compared to its expected life, as well as an order of magnitude of the required investments in the following years. 相似文献
123.
Tasca Giorgio A.; Ramsay Tim; Corace Kimberly; Illing Vanessa; Bone Meagan; Bissada Hany; Balfour Louise 《Canadian Metallurgical Quarterly》2010,14(2):151
Many community- and hospital-based group treatment programs have an open enrolment, that is, a rolling admissions structure, in which a group member who drops out or successfully completes therapy is replaced by another individual. Although practically efficient and perhaps clinically useful, the interdependence of these group participants' data may result in incorrect inferences drawn from the data analyses if this interdependence is not accounted for. We present an analytic strategy that uses time varying covariates in multilevel models to illustrate a methodology to address these data analysis problems. Participants were adults with eating disorders (N = 229) who attended an average of 12 weeks of a rolling admissions group-based day hospital program during an 8-year period, and who completed a group therapy alliance measure weekly. Individual alliance to the group increased from week to week, and this growth remained significant even after controlling for the time varying level of other group members' alliance to the group. Further, the level of an individual's alliance score during any given week was positively related to the group's alliance during that week. The multilevel time varying covariate models presented here add to a very small but emerging set of analytic strategies available for researchers to address some of the hurdles to correctly analyze data from rolling admissions group-based treatment programs. Results from this study provide evidence that a group's culture is passed on and affects an individual's alliance to the group despite changes in group membership. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
124.
This communication is a commentary on William W. Meissner's presentation (see record 2006-20697-003) of a patient who chronically came late for sessions. The time duration of analytic work-relatively restricted per hour yet potentially limitless in overall duration-represents an existential paradox that is fundamental to the basic representational qualities of mental experience, and inherent in a mute way in the analytic frame. It is to be expected that the latent temporal elements of the patient's conflicts will inevitably challenge this aspect of the frame, subtly coercing patient and analyst to recreate these novel dimensions. If the analyst is too cautious regarding the inevitability of countertransference reactions to such a patient, important developmental opportunities may be missed. I suspect that the chronic lateness and absence that characterized the work with this patient screened an early, nonmentalized trauma that had torn a hole in the foundations of the patient's sense of time, and was inadvertently expressed by Meissner in an entirely atypical manner. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
125.
高纯度多晶硅是“十二五”的发展重点,本文系统分析了我国物理法多晶硅行业发展面临的战略环境,将SWOT分析与层次分析法相结合,对关键战略环境要素进行量化分析,并构建了SWOT战略选择图,得出目前其发展的优势大于劣势,机会多于威胁。 相似文献
126.
Imad Jabir 《Energy Economics》2001,23(6):4126
Tremendous political pressure is being exerted on the US government by different political parties to diversify its sources of foreign oil supplies by switching from the reliance on OPEC's oil to that originating from non-OPEC nations. Without a doubt, such a shift would adversely impact the market share of some OPEC members, particularly Saudi Arabia, Venezuela and Nigeria. These countries should therefore consider seriously the negative impact of this scenario and consequently formulate individual or joint production policies aiming at protecting their oil market share. To help OPEC achieve this objective, there is a need to estimate the demand function of US oil imports. This paper proffers an estimate of such a function, taking into account, among other variables, the impact of US Strategic Petroleum Reserve (SPR). 相似文献
127.
Firms are facing more difficulties with the implementation of strategies than with its formulation. Therefore, this paper examines the linkage between business strategy, project portfolio management, and business success to close the gap between strategy formulation and implementation. Earlier research has found some supporting evidence of a positive relationship between isolated concepts, but so far there is no coherent and integral framework covering the whole cycle from strategy to success. Therefore, the existing research on project portfolio management is extended by the concept of strategic orientation. Based on a literature review, a comprehensive conceptual model considering strategic orientation, project portfolio structuring, project portfolio success, and business success is developed. This model can be used for future empirical research on the influence of strategy on project portfolio management and its success. Furthermore, it can easily be extended e.g. by contextual factors. 相似文献
128.
Mohammad Babaesmailli Behrooz ArbabshiraniVahid Golmah 《Expert systems with applications》2012,39(1):925-935
SWOT analysis is the most important tool for decision makers in strategic management process, because it enables the managers to discover and collect the facts that resulted from internal and external analysis. This analysis can be a good base for strategy formulation, but it is not non-defect. It includes no means of analytically determining the importance of factors or assessing the fit between SWOTS factors and decision alternatives and is mainly based on the qualitative analysis. Many researchers develop different techniques to quantify the SWOT analysis, but these methods are not comprehensive. In this study, we develop a fuzzy method model for quantitative weighing of SWOT strategies. The decision maker’s imprecise information is regarded by fuzzy numbers in this model. To consider dependency among factors and sub-factors, we use ANP technique in our research. We demonstrate our model with a case study example and compare results of our research with prior research. 相似文献
129.
The therapeutic alliance is often misconceived, misunderstood, or ignored in conceptualizing the therapeutic process and the therapeutic relation in analysis and other forms of therapy. Conversely, I will argue that the alliance is indispensable in all forms of therapy. After briefly outlining the nature of the alliance, I discuss some of the empirical findings regarding its utility in various therapeutic contexts. I then consider its role and function in various therapeutic settings other than adult analysis and psychotherapy, including child analysis, treating various forms of psychopathology, and related contexts like supervision, forensic psychiatry, and hospital and medical treatment. The alliance plays a definite but analogous role in all of these, with differences according to context. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
130.
Taft Casey T.; Murphy Christopher M.; King Daniel W.; Musser Peter H.; DeDeyn Judith M. 《Canadian Metallurgical Quarterly》2003,71(4):812
This study used multilevel modeling to examine process and treatment adherence factors as predictors of collateral partner reports of abuse following participation in a cognitive-behavioral group treatment program for partner violent men (N = 107). Therapist working alliance ratings predicted lower levels of physical and psychological abuse at the 6-month follow-up and were the strongest predictors of outcome. Homework compliance partially mediated associations between early alliance ratings and psychological abuse at follow-up. Greater group cohesion during treatment, assessed by client report, also predicted lower physical and psychological abuse at follow-up. The findings support the promotion of a collaborative therapeutic environment to induce change among partner violent men. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献