全文获取类型
收费全文 | 652篇 |
免费 | 63篇 |
国内免费 | 6篇 |
专业分类
电工技术 | 13篇 |
化学工业 | 134篇 |
金属工艺 | 11篇 |
机械仪表 | 7篇 |
建筑科学 | 15篇 |
矿业工程 | 1篇 |
能源动力 | 31篇 |
轻工业 | 21篇 |
水利工程 | 9篇 |
石油天然气 | 4篇 |
无线电 | 126篇 |
一般工业技术 | 147篇 |
冶金工业 | 40篇 |
原子能技术 | 7篇 |
自动化技术 | 155篇 |
出版年
2024年 | 2篇 |
2023年 | 17篇 |
2022年 | 24篇 |
2021年 | 49篇 |
2020年 | 30篇 |
2019年 | 28篇 |
2018年 | 37篇 |
2017年 | 39篇 |
2016年 | 37篇 |
2015年 | 26篇 |
2014年 | 39篇 |
2013年 | 53篇 |
2012年 | 38篇 |
2011年 | 37篇 |
2010年 | 31篇 |
2009年 | 22篇 |
2008年 | 31篇 |
2007年 | 34篇 |
2006年 | 22篇 |
2005年 | 11篇 |
2004年 | 8篇 |
2003年 | 6篇 |
2002年 | 10篇 |
2001年 | 5篇 |
2000年 | 3篇 |
1999年 | 7篇 |
1998年 | 9篇 |
1997年 | 4篇 |
1996年 | 7篇 |
1995年 | 9篇 |
1994年 | 7篇 |
1993年 | 1篇 |
1992年 | 5篇 |
1991年 | 5篇 |
1989年 | 1篇 |
1988年 | 3篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 3篇 |
1983年 | 4篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1978年 | 3篇 |
1976年 | 3篇 |
1975年 | 1篇 |
1974年 | 1篇 |
排序方式: 共有721条查询结果,搜索用时 125 毫秒
1.
2.
Three new circuit topologies for first-order all-pass filters, each with two variations, realising six new first-order voltage-mode all-pass sections are proposed. Each circuit employs two differential voltage current conveyors and three grounded passive components, ideal for IC implementation. All the circuits possess high input impedance, which is a desirable feature for voltage-mode circuits. As an application, a new quadrature oscillator circuit is realised using one of the proposed all-pass circuits. PSPICE simulations using 0.5 mum CMOS parameters confirm the validity and practical utility of the proposed circuits 相似文献
3.
A limited selection of samples of small and medium size air-conditioning equipment being marketed or manufactured in Kuwait was tested in an internationally reputed laboratory. The actual performance results obtained from laboratory tests were analyzed and compared with the commercially available information from the manufacturers for the same selected units. The analysis indicated the quality of air-conditioning equipment available to the Kuwaiti user. 相似文献
4.
Swoop: A Web Ontology Editing Browser 总被引:2,自引:0,他引:2
Aditya Kalyanpur Bijan Parsia Evren Sirin Bernardo Cuenca Grau James Hendler 《Journal of Web Semantics》2006,4(2):144
In this paper, we describe Swoop, a hypermedia inspired Ontology Browser and Editor based on OWL, the recently standardized Web-oriented ontology language. After discussing the design rationale and architecture of Swoop, we focus mainly on its features, using illustrative examples to highlight its use. We demonstrate that with its Web-metaphor, adherence to OWL recommendations and key unique features, such as Collaborative Annotation using Annotea, Swoop acts as a useful and efficient Web Ontology development tool. We conclude with a list of future plans for Swoop, that should further increase its overall appeal and accessibility. 相似文献
5.
In this paper we design a dynamic dictionary for
the priced information model initiated by Charikar et al. Assume that a set S consisting of n elements is given such that
each element has an associated price, a positive real number. The cost of performing an operation on elements of S is a function
of their prices. The cost of an algorithm is the sum of the costs of
all operations it performs. The objective is to design algorithms
which incur low cost. In this model we propose a dynamic dictionary, supporting
search, insert and delete, for keys drawn from a linearly ordered set.
As an application we show that the dictionary can be used in
computing the trapezoidal map of a set of line segments, a fundamental problem in
computational geometry. 相似文献
6.
7.
Aman Singh Jaydip Chandrakant Mehta Divya Anand Pinku Nath Babita Pandey Aditya Khamparia 《Expert Systems》2021,38(1)
In real world, the automatic detection of liver disease is a challenging problem among medical practitioners. The intent of this work is to propose an intelligent hybrid approach for the diagnosis of hepatitis disease. The diagnosis is performed with the combination of k‐means clustering and improved ensemble‐driven learning. To avoid clinical experience and to reduce the evaluation time, ensemble learning is deployed, which constructs a set of hypotheses by using multiple learners to solve a liver disease problem. The performance analysis of the proposed integrated hybrid system is compared in terms of accuracy, true positive rate, precision, f‐measure, kappa statistic, mean absolute error, and root mean squared error. Simulation results showed that the enhanced k‐means clustering and improved ensemble learning with enhanced adaptive boosting, bagged decision tree, and J48 decision tree‐based intelligent hybrid approach achieved better prediction outcomes than other existing individual and integrated methods. 相似文献
8.
Maheshwari Rashmi Kumar Naveen Shadi Monal Tiwari Shailesh 《The Journal of supercomputing》2021,77(8):8653-8673
The Journal of Supercomputing - Data availability ensures efficient data accessibility by the readers anytime and from anywhere. It can be addressed by creating multiple copies of each data file... 相似文献
9.
Phan Alex Truong Phuong Schade Christoph Vasan Aditya Friend James Talke Frank E. 《Microsystem Technologies》2021,27(6):2473-2479
Microsystem Technologies - “Zero drift” behavior of an optical intraocular pressure sensor is studied using an analytical model based on the deflection of a circular membrane. Results... 相似文献
10.
Verma Amar Kumar Nagpal Shivika Desai Aditya Sudha Radhika 《Neural computing & applications》2021,33(4):1297-1310
Neural Computing and Applications - Induction machines have extensive demand in industries as they are used for large-scale production and, therefore, vulnerable to both electrical and mechanical... 相似文献