全文获取类型
收费全文 | 6671篇 |
免费 | 369篇 |
国内免费 | 243篇 |
专业分类
电工技术 | 183篇 |
综合类 | 531篇 |
化学工业 | 319篇 |
金属工艺 | 479篇 |
机械仪表 | 266篇 |
建筑科学 | 389篇 |
矿业工程 | 132篇 |
能源动力 | 176篇 |
轻工业 | 721篇 |
水利工程 | 149篇 |
石油天然气 | 64篇 |
武器工业 | 52篇 |
无线电 | 129篇 |
一般工业技术 | 395篇 |
冶金工业 | 1704篇 |
原子能技术 | 11篇 |
自动化技术 | 1583篇 |
出版年
2024年 | 10篇 |
2023年 | 42篇 |
2022年 | 97篇 |
2021年 | 126篇 |
2020年 | 170篇 |
2019年 | 158篇 |
2018年 | 132篇 |
2017年 | 122篇 |
2016年 | 179篇 |
2015年 | 205篇 |
2014年 | 329篇 |
2013年 | 396篇 |
2012年 | 366篇 |
2011年 | 430篇 |
2010年 | 363篇 |
2009年 | 404篇 |
2008年 | 323篇 |
2007年 | 453篇 |
2006年 | 455篇 |
2005年 | 353篇 |
2004年 | 316篇 |
2003年 | 318篇 |
2002年 | 299篇 |
2001年 | 278篇 |
2000年 | 205篇 |
1999年 | 166篇 |
1998年 | 122篇 |
1997年 | 97篇 |
1996年 | 69篇 |
1995年 | 55篇 |
1994年 | 68篇 |
1993年 | 31篇 |
1992年 | 22篇 |
1991年 | 15篇 |
1990年 | 10篇 |
1989年 | 6篇 |
1988年 | 8篇 |
1987年 | 8篇 |
1985年 | 6篇 |
1984年 | 12篇 |
1983年 | 9篇 |
1982年 | 6篇 |
1981年 | 4篇 |
1980年 | 3篇 |
1979年 | 3篇 |
1966年 | 5篇 |
1963年 | 3篇 |
1959年 | 3篇 |
1958年 | 4篇 |
1954年 | 4篇 |
排序方式: 共有7283条查询结果,搜索用时 15 毫秒
161.
162.
Yingjun Xu 《Computers & Industrial Engineering》2011,61(1):48-54
In this paper, a new approach is proposed to solve group decision making (GDM) problems where the preference information on alternatives provided by decision makers (DMs) is represented in four formats of incomplete preference relations, i.e., incomplete multiplicative preference relations, incomplete fuzzy preference relations, incomplete additive linguistic preference relations, incomplete multiplicative linguistic preference relations. In order to make the collective opinion close each decision maker’s opinion as near as possible, an optimization model is constructed to integrate the four different formats of incomplete preference relations and to compute the collective ranking values of the alternatives. The ranking of alternatives or selection of the most desirable alternative(s) is directly obtained from the derived collective ranking values. A numerical example is also used to illustrate the applicability of the proposed approach. 相似文献
163.
H.G. Sun 《Engineering Applications of Artificial Intelligence》2011,24(5):840-849
In this study, an inexact fuzzy-queue programming (IFQP) model is developed for municipal solid waste (MSW) management under uncertainty, where fuzzy queue (FQ) model is introduced into the interval-fuzzy linear programming (IFLP) framework. The proposed IFQP model can not only handle uncertainties that are presented in terms of fuzzy sets and discrete intervals, but also reflect the influence of FQ in decision-making problems. Moreover, it can help quantify the satisfaction degrees of the system cost and constraints under uncertainty. It improves upon the existing optimization model with advantages in data availability, uncertainty reflection and result analysis. In its solution process, the model is transformed into two deterministic submodels based on an interactive algorithm. Interval solutions which are stable in the decision space can be obtained by solving the two submodels sequentially. The developed model is applied to a case of long-term planning of MSW management systems to demonstrate its applicability. It can effectively reflect dynamic, interactive, and uncertain characteristics of municipal waste management systems. The decision variable solutions provide optimal schemes for waste flow allocation corresponding to lower and upper bounds of system cost. The results indicate that reasonable solutions have been generated. They are helpful for supporting: (i) decision making or justification of waste-allocation patterns of MSW management system, and (ii) in-depth analysis of tradeoffs among system cost, satisfaction degree, and environmental constraint under uncertainty. 相似文献
164.
为解决目前基于CBR的推荐系统只考虑属性值全部为精确或全部为非精确数据的情况,提出一种基于MADM的多Agent推荐系统框架。在考虑了属性分类的基础上设计了基于距离的混合数据类型的相似性度量算法及TOPSIS多属性决策方法,设计了该系统各组成部分功能、结构和流程。模拟算例演示了案例推理及多属性决策在本系统的应用过程,结果表明该系统有较好的实用性。 相似文献
165.
针对巨量可选方案的群体决策问题,提出了一个新的基于参考点和投票规则的多目标粒子群优化算法。该算法把个体与参考点的支配关系或者距离作为一个重要因素,在选择引导者的锦标赛方法,局部最优更新规则,以及外部种群档案剪枝规则中都嵌入了基于支配关系或距离因素的投票规则,以找到群体决策解,并且提高搜索效率。仿真结果表明该算法有效。 相似文献
166.
In this paper, we propose a general optimization-based model for classification. Then we show that some well-known optimization-based methods for classification, which were developed by Shi et al. [Data mining in credit card portfolio management: a multiple criteria decision making approac. In: Koksalan M, Zionts S, editors. Multiple criteria decision making in the new millennium. Berlin: Springer; 2001. p. 427–36] and Freed and Glover [A linear programming approach to the discriminant problem. Decision Sciences 1981; 12: 68–79; Simple but powerful goal programming models for discriminant problems. European Journal of Operational Research 1981; 7: 44–60], are special cases of our model. Moreover, three new models, MCQP (multi-criteria indefinite quadratic programming), MCCQP (multi-criteria concave quadratic programming) and MCVQP (multi-criteria convex programming), are developed based on the general model. We also propose algorithms for MCQP and MCCQP, respectively. Then we apply these models to three real-life problems: credit card accounts, VIP mail-box and social endowment insurance classification. Extensive experiments are done to compare the efficiency of these methods. 相似文献
167.
We developed a performance assessment model for e-commerce; it included indicators, indicator weights, and evaluation methods. The model has seven methods of assessing e-commerce performance and uses four criteria to compare and select the appropriate one for a particular situation. This model was tested in the retail sector of China. According to the data collected from 70 Chinese retailers, 16 indicators of e-commerce performance consisted of four constructs: marketing and sales, customer service, supply chain efficiency, and financial performance. The indicators for those constructs provide a comprehensive measurement of performance. Then weights were assigned for each indicator using a majority aggregation method. Comparison of the results from seven evaluation methods showed that discordance analysis and simple additive weighting were the best evaluation methods for the enterprises we had sampled. 相似文献
168.
Semantic Web society was initially focused only on data, but then gradually moved toward knowledge. If a vision of the Semantic Web is to enhance humans' decision-making assisted by machines, a missing but important part is knowledge about constraints on data and concepts represented by ontology. This paper proposes a Semantic Web Constraint Language (SWCL) based on OWL, and shows its effectiveness in representing and solving an internet shopper's decision-making problems by implementing a shopping agent in the Semantic Web environment. 相似文献
169.
Learning Fast Emulators of Binary Decision Processes 总被引:1,自引:0,他引:1
Computation time is an important performance characteristic of computer vision algorithms. The paper shows how existing (slow)
binary decision algorithms can be approximated by a (fast) trained WaldBoost classifier.
WaldBoost learning minimises the decision time of the classifier while guaranteeing predefined precision. We show that the
WaldBoost algorithm together with bootstrapping is able to efficiently handle an effectively unlimited number of training
examples provided by the implementation of the approximated algorithm.
Two interest point detectors, the Hessian-Laplace and the Kadir-Brady saliency detectors, are emulated to demonstrate the
approach. Experiments show that while the repeatability and matching scores are similar for the original and emulated algorithms,
a 9-fold speed-up for the Hessian-Laplace detector and a 142-fold speed-up for the Kadir-Brady detector is achieved. For the
Hessian-Laplace detector, the achieved speed is similar to SURF, a popular and very fast handcrafted modification of Hessian-Laplace;
the WaldBoost emulator approximates the output of the Hessian-Laplace detector more precisely. 相似文献
170.
Several authors have hailed intuition as one of the defining features of expertise. In particular, while disagreeing on almost
anything that touches on human cognition and artificial intelligence, Hubert Dreyfus and Herbert Simon agreed on this point.
However, the highly influential theories of intuition they proposed differed in major ways, especially with respect to the
role given to search and as to whether intuition is holistic or analytic. Both theories suffer from empirical weaknesses.
In this paper, we show how, with some additions, a recent theory of expert memory (the template theory) offers a coherent
and wide-ranging explanation of intuition in expert behaviour. It is shown that the theory accounts for the key features of
intuition: it explains the rapid onset of intuition and its perceptual nature, provides mechanisms for learning, incorporates
processes showing how perception is linked to action and emotion, and how experts capture the entirety of a situation. In
doing so, the new theory addresses the issues problematic for Dreyfus’s and Simon’s theories. Implications for research and
practice are discussed.
相似文献
Fernand GobetEmail: |