全文获取类型
收费全文 | 2373篇 |
免费 | 174篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 19篇 |
化学工业 | 622篇 |
金属工艺 | 80篇 |
机械仪表 | 87篇 |
建筑科学 | 99篇 |
矿业工程 | 9篇 |
能源动力 | 219篇 |
轻工业 | 390篇 |
水利工程 | 8篇 |
石油天然气 | 21篇 |
无线电 | 83篇 |
一般工业技术 | 463篇 |
冶金工业 | 70篇 |
原子能技术 | 13篇 |
自动化技术 | 366篇 |
出版年
2024年 | 13篇 |
2023年 | 25篇 |
2022年 | 59篇 |
2021年 | 108篇 |
2020年 | 81篇 |
2019年 | 70篇 |
2018年 | 138篇 |
2017年 | 125篇 |
2016年 | 142篇 |
2015年 | 94篇 |
2014年 | 135篇 |
2013年 | 326篇 |
2012年 | 121篇 |
2011年 | 142篇 |
2010年 | 167篇 |
2009年 | 139篇 |
2008年 | 121篇 |
2007年 | 112篇 |
2006年 | 62篇 |
2005年 | 37篇 |
2004年 | 36篇 |
2003年 | 29篇 |
2002年 | 30篇 |
2001年 | 10篇 |
2000年 | 19篇 |
1999年 | 15篇 |
1998年 | 29篇 |
1997年 | 11篇 |
1996年 | 19篇 |
1995年 | 7篇 |
1994年 | 7篇 |
1993年 | 11篇 |
1992年 | 5篇 |
1991年 | 6篇 |
1990年 | 5篇 |
1987年 | 4篇 |
1986年 | 4篇 |
1985年 | 11篇 |
1984年 | 11篇 |
1983年 | 5篇 |
1982年 | 6篇 |
1981年 | 12篇 |
1980年 | 7篇 |
1979年 | 4篇 |
1978年 | 3篇 |
1977年 | 4篇 |
1976年 | 6篇 |
1974年 | 4篇 |
1973年 | 4篇 |
1971年 | 2篇 |
排序方式: 共有2549条查询结果,搜索用时 46 毫秒
51.
Özden Engin Çak?c? Harry Groenevelt Abraham SeidmannAuthor vitae 《Decision Support Systems》2011,51(4):842-852
Motivated by a case study at a radiology practice, we analyze the incremental benefits of RFID technology over barcodes for managing pharmaceutical inventories. Unlike barcode technology, RFID enables accurate real-time visibility, which in turn enables several process improvements. We analyze the impact of automatic counting and discuss the system redesign critical to optimizing the inventory policy and eliminating shrinkage. We show that continuous review is superior to periodic review whenever accurate real-time information is available at no additional cost. We explain how RFID-enabled strategies vary with inventory parameters and provide a cost-benefit analysis for the implementation of RFID for the radiology practice. 相似文献
52.
Mehmet Bozca Ata Muğan Hakan Temeltaş 《Structural and Multidisciplinary Optimization》2008,36(2):169-191
Integrated optimum design of structures and control systems is studied by using H
2 and robust control formulations. It is derived that conventional simultaneous optimization approach by using these robust control
laws can be approximated by a decoupled optimization approach in which the structures are optimized by shaping the structural
singular values and then the controllers can be designed, namely, decoupled, sequential or successive design approach. It
is shown that the proposed decoupled optimization approach can be used to design optimum robust structures and has certain
advantages over the conventional simultaneous optimization procedures such as it avoids the drawbacks of pure robust control
laws and faster, especially if the number of degrees of freedom (DOF) of the associated structure is large. The bounds for
achievable robustness measures are also obtained. Following, simultaneous and decoupled optimization approaches are applied
to active control of two structures. The optimization results are presented, and it is concluded that the proposed decoupled
optimization approach yields the achieved global minimum much faster than the simultaneous optimization approach. 相似文献
53.
Because of its self-regulating nature, immune system has been an inspiration source for usually unsupervised learning methods in classification applications of Artificial Immune Systems (AIS). But classification with supervision can bring some advantages to AIS like other classification systems. Indeed, there have been some studies, which have obtained reasonable results and include supervision in this branch of AIS. In this study, we have proposed a new supervised AIS named as Supervised Affinity Maturation Algorithm (SAMA) and have presented its performance results through applying it to diagnose atherosclerosis using carotid artery Doppler signals as a real-world medical classification problem. We have employed the maximum envelope of the carotid artery Doppler sonograms derived from Autoregressive (AR) method as an input of proposed classification system and reached a maximum average classification accuracy of 98.93% with 10-fold cross-validation method used in training-test portioning. To evaluate this result, comparison was done with Artificial Neural Networks and Decision Trees. Our system was found to be comparable with those systems, which are used effectively in literature with respect to classification accuracy and classification time. Effects of system's parameters were also analyzed in performance evaluation applications. With this study and other possible contributions to AIS, classification algorithms with effective performances can be developed and potential of AIS in classification can be further revealed. 相似文献
54.
55.
High throughput biological data need to be processed, analyzed, and interpreted to address problems in life sciences. Bioinformatics, computational biology, and systems biology deal with biological problems using computational methods. Clustering is one of the methods used to gain insight into biological processes, particularly at the genomics level. Clearly, clustering can be used in many areas of biological data analysis. However, this paper presents a review of the current clustering algorithms designed especially for analyzing gene expression data. It is also intended to introduce one of the main problems in bioinformatics – clustering gene expression data – to the operations research community. 相似文献
56.
57.
Multiscale modeling and integration of physiological models carry challenges due to the complex nature of physiological processes. High coupling within and among scales present a significant challenge in constructing and integrating multiscale physiological models. In order to deal with such challenges in a systematic way, there is a significant need for an information technology framework together with related analytical and computational tools that will facilitate integration of models and simulations of complex biological systems. Physiological Model Simulation, Integration and Modeling Framework (Phy-SIM) is an information technology framework providing the tools to facilitate development, integration and simulation of integrated models of human physiology. Phy-SIM brings software level solutions to the challenges raised by the complex nature of physiological systems. The aim of Phy-SIM, and this paper is to lay some foundation with the new approaches such as information flow and modular representation of the physiological models. The ultimate goal is to enhance the development of both the models and the integration approaches of multiscale physiological processes and thus this paper focuses on the design approaches that would achieve such a goal. 相似文献
58.
59.
Radu-Emil Precup Marius L. Tomescu Mircea-Bogdan Rădac Emil M. Petriu Stefan Preitl Claudia-Adina Dragoş 《Expert systems with applications》2012,39(9):8288-8299
This paper suggests the performance improvement of fuzzy control systems (FCSs) for three tank systems using iterative feedback tuning (IFT). The stable design of Takagi–Sugeno–Kang fuzzy controllers is guaranteed by means of a stability theorem based on LaSalle’s global invariant set theorem formulated for a class of multi input-multi output (MIMO) nonlinear processes. An IFT algorithm characterized by setting the step size to guarantee the FCS stability is proposed. The theoretical approaches are applied in a case study that deals with the IFT-based stable design of fuzzy controllers dedicated to the level control of a cylindrical three tank system as a representative MIMO system. A set of experimental results for a laboratory setup illustrates the performance improvement. 相似文献
60.
Estimation and hypothesis testing based on normal samples censored in the middle are developed and shown to be remarkably
efficient and robust to symmetric shorttailed distributions and to inliers in a sample. This negates the perception that sample
mean and variance are the best robust estimators in such situations (Tiku, 1980; Dunnett, 1982).
Professor Emeritus, Department of Mathematics and Statistics, McMaster University,
Professor Emeritus, Department of Mathematics and Statistics, McMaster University, 相似文献