全文获取类型
收费全文 | 533篇 |
免费 | 22篇 |
国内免费 | 1篇 |
专业分类
综合类 | 2篇 |
化学工业 | 119篇 |
金属工艺 | 6篇 |
机械仪表 | 8篇 |
建筑科学 | 16篇 |
能源动力 | 8篇 |
轻工业 | 55篇 |
水利工程 | 4篇 |
石油天然气 | 6篇 |
无线电 | 15篇 |
一般工业技术 | 67篇 |
冶金工业 | 213篇 |
原子能技术 | 5篇 |
自动化技术 | 32篇 |
出版年
2023年 | 4篇 |
2022年 | 9篇 |
2021年 | 18篇 |
2020年 | 3篇 |
2019年 | 10篇 |
2018年 | 17篇 |
2017年 | 10篇 |
2016年 | 11篇 |
2015年 | 6篇 |
2014年 | 16篇 |
2013年 | 32篇 |
2012年 | 15篇 |
2011年 | 19篇 |
2010年 | 24篇 |
2009年 | 24篇 |
2008年 | 25篇 |
2007年 | 18篇 |
2006年 | 24篇 |
2005年 | 19篇 |
2004年 | 12篇 |
2003年 | 18篇 |
2002年 | 8篇 |
2001年 | 6篇 |
2000年 | 6篇 |
1999年 | 8篇 |
1998年 | 12篇 |
1997年 | 14篇 |
1996年 | 13篇 |
1995年 | 14篇 |
1994年 | 9篇 |
1993年 | 14篇 |
1992年 | 7篇 |
1991年 | 6篇 |
1990年 | 10篇 |
1989年 | 11篇 |
1988年 | 17篇 |
1987年 | 8篇 |
1986年 | 9篇 |
1985年 | 9篇 |
1984年 | 6篇 |
1983年 | 4篇 |
1981年 | 6篇 |
1980年 | 4篇 |
1979年 | 2篇 |
1978年 | 2篇 |
1977年 | 3篇 |
1975年 | 2篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1945年 | 1篇 |
排序方式: 共有556条查询结果,搜索用时 15 毫秒
1.
Marcia Cristina Kaezer Fran a Rosane Aguiar da Silva San Gil Jean-Guillaume Eon 《Catalysis Today》2003,78(1-4):105-115
γ-Al2O3 supported vanadium oxides were modified by tungsten and molybdenum oxides in order to improve dispersion and selectivity towards olefins in propane oxidative dehydrogenation (ODH). Both vanadium–tungsten and vanadium–molybdenum catalysts were obtained by adsorption of mixed isopolyanions (VW5O195−, V2W4O194−, VMo5O195− and V2Mo4O194−) from aqueous solutions. The isopolyanion solutions were characterized by UV-Vis and 51V NMR spectroscopy. Vanadium, vanadium–tungsten and vanadium–molybdenum precursors and catalysts were also characterized by UV-Vis (diffuse reflectance) and solid state 51V NMR spectroscopy. An improved selectivity to propene in the presence of tungsten and molybdenum in VOx/γ-Al2O3 was observed and attributed to dilution of vanadium by tungsten or molybdenum oxides on the γ-Al2O3 surface. 相似文献
2.
Cunningham William A.; Johnson Marcia K.; Gatenby J. Chris; Gore John C.; Banaji Mahzarin R. 《Canadian Metallurgical Quarterly》2003,85(4):639
Evaluative responses appear to involve 2 seemingly distinct sets of processes: those that are automatically activated and others that are more consciously controlled. Using functional magnetic resonance imaging, the authors investigated the brain systems associated with automatic and controlled evaluative processing. Participants made either evaluative (good-bad) or nonevaluative (past-present) judgments about famous names. Greater amygdala activity was observed for names rated as "bad" relative to those rated as "good," regardless of whether the task directly involved an evaluative judgment (good-bad) or not (past-present). Good-bad judgments resulted in greater medial and ventrolateral prefrontal cortex (PFC) activity than past-present judgments. Furthermore, there was greater ventrolateral PFC activity in good-bad judgments marked by greater ambivalence. Together, these findings indicate a neural distinction between processes engaged for automatic and controlled evaluation. Whereas automatic processes are sensitive to simple valence, controlled processes are sensitive to attitudinal complexity. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
3.
A comprehensive model of the work–family interface was developed and tested. The proposed model extended prior research by explicitly distinguishing between work interfering with family and family interfering with work. This distinction allowed testing of hypotheses concerning the unique antecedents and outcomes of both forms of work–family conflict and a reciprocal relationship between them. The influence of gender, race, and job type on the generalizability of the model was also examined. Data were obtained through household interviews with a random sample of 631 individuals. The model was tested with structural equation modeling techniques. Results were strongly supportive. In addition, although the model was invariant across gender and race, there were differences across blue- and white-collar workers. Implications for future research on the work–family interface are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
4.
5.
Paulo A. Santos Marcia A.S. Spinac Karen K.G. Fermoselli Marco-A. De Paoli 《Composites Part A》2007,38(12):2404-2411
The interest for the use of vegetal fibers as polymers reinforcement has recently increased because of their unique environmental and technological advantages. This work evaluated the use of Curauá fibers in polyamide-6 composites aiming at glass fiber replacement. Fiber content of 20, 30 or 40 wt% and fiber lengths of 0.1 or 10 mm were studied. Fibers were treated with N2 plasma or washed with NaOH solution, to improve their adhesion to PA-6. Samples with 20 wt% of short or long fibers, with or without pre-treatment, were compounded in two different co-rotating intermeshing twin-screw extruders. These samples were submitted to mechanical and thermal tests. In conclusion, non-dried raw materials improved fiber/matrix interfacial adhesion. Tensile and flexural properties of this composite are better than unfilled, but lower than glass fiber reinforced polyamide-6. However, its impact resistance and heat deflection temperature are similar to the glass fiber reinforced polyamide-6 and its lower density, enable it to replace this latter in specific non-critical applications. 相似文献
6.
G. S. Nitschke A. E. Eiben M. C. Schut 《Genetic Programming and Evolvable Machines》2012,13(4):493-536
This article evaluates Collective Neuro-Evolution (CONE), a cooperative co-evolutionary method for solving collective behavior tasks and increasing task performance via facilitating behavioral specialization in agent teams. Specialization is used as a problem solving mechanism, and its emergence is guided and regulated by CONE. CONE is comparatively evaluated with related methods in a simulated evolutionary robotics pursuit-evasion task. This task required multiple pursuer robots to cooperatively capture evader robots. Results indicate that CONE is appropriate for evolving specialized behaviors. The interaction of specialized behaviors produces behavioral heterogeneity in teams and collective prey capture behaviors that yield significantly higher performances compared to related methods. 相似文献
7.
The polymerization of α-methylstyrene (αMeSty) initiated by HI/I2 or HI in the presence of liquid sulfur dioxide has been investigated. The number-average molecular weight increased with
the monomer concentration for reactions initiated by the HI/I2 system. I2 also participates in the initiation process, increasing the number-average polymer chain at higher monomer concentration.
HI alone is also able to initiate the polymerization of αMeSty in the presence of SO2. With this initiator, transfer reaction can be minimized in systems containing low amount of SO2.
Received: 19 December 1996/Revised: 27 January 1997/Accepted 29 January 1997 相似文献
8.
希普霍普风格(hiphop style)是与20世纪90年代说唱音乐文化相联系的一种充满争议的着装形式.人们对它的分析和诠释一直以符号学的结构性研究方法为基础.不同时间段中的符号学体系彼此分离,在建立这个体系中的诸多因素和所蕴含意义的关系方面,需要考虑三个编码操作(coding operations),即范式对齐(paradigmatic alignment)--极端的观点、外延意义和内涵意义(denotation and connotation)--字面的意义和延伸的意叉、修辞手段(figurative devices)--暗含的喻义.研究结果依据希普霍普风格系统符号和常规着装系统符号间的辩证关系,揭示了这一体系的结构.常规着装体系的组成要素由此得以揭示,支持希普霍鲁系统的象征性语言也被描述了出来.希普霍普风格被当作一种与超奇着装设计相关的服装体系的范例加以分析,而这种风格与普通着装形式是对立的,这种分析对相关理论的发展有着积极的意义. 相似文献
9.
Fuchs E Gruber T Nitschke J Sick B 《IEEE transactions on pattern analysis and machine intelligence》2010,32(12):2232-2245
The paper presents SwiftSeg, a novel technique for online time series segmentation and piecewise polynomial representation. The segmentation approach is based on a least-squares approximation of time series in sliding and/or growing time windows utilizing a basis of orthogonal polynomials. This allows the definition of fast update steps for the approximating polynomial, where the computational effort depends only on the degree of the approximating polynomial and not on the length of the time window. The coefficients of the orthogonal expansion of the approximating polynomial-obtained by means of the update steps-can be interpreted as optimal (in the least-squares sense) estimators for average, slope, curvature, change of curvature, etc., of the signal in the time window considered. These coefficients, as well as the approximation error, may be used in a very intuitive way to define segmentation criteria. The properties of SwiftSeg are evaluated by means of some artificial and real benchmark time series. It is compared to three different offline and online techniques to assess its accuracy and runtime. It is shown that SwiftSeg-which is suitable for many data streaming applications-offers high accuracy at very low computational costs. 相似文献
10.
Marcia A. Mardis Ellen S. Hoffman Todd E. Marshall 《International Journal on Digital Libraries》2008,9(1):19-27
Despite their decade of deployment, educational digital libraries have not achieved sustained use in elementary and secondary
schools in the United States. Barriers to accessing the Internet and computers have been widely targeted by myriad initiatives,
but efforts aimed at bridging this first-level “digital divide” have not led to increased use of the Internet and digital
library resources in U.S. classrooms. In fact, such programs have revealed additional divides that affect educators’ use.
This paper examines the additional digital divide levels and proposes a new framework for understanding technology innovation
in schools that can improve development and outreach approaches by digital library developers. 相似文献