全文获取类型
收费全文 | 606篇 |
免费 | 9篇 |
国内免费 | 5篇 |
专业分类
电工技术 | 4篇 |
综合类 | 3篇 |
化学工业 | 69篇 |
金属工艺 | 4篇 |
机械仪表 | 16篇 |
建筑科学 | 25篇 |
能源动力 | 4篇 |
轻工业 | 7篇 |
水利工程 | 1篇 |
石油天然气 | 6篇 |
武器工业 | 1篇 |
无线电 | 97篇 |
一般工业技术 | 81篇 |
冶金工业 | 211篇 |
自动化技术 | 91篇 |
出版年
2023年 | 2篇 |
2022年 | 5篇 |
2019年 | 2篇 |
2018年 | 8篇 |
2017年 | 8篇 |
2016年 | 8篇 |
2015年 | 2篇 |
2014年 | 12篇 |
2013年 | 40篇 |
2012年 | 9篇 |
2011年 | 35篇 |
2010年 | 30篇 |
2009年 | 27篇 |
2008年 | 25篇 |
2007年 | 25篇 |
2006年 | 18篇 |
2005年 | 15篇 |
2004年 | 13篇 |
2003年 | 18篇 |
2002年 | 17篇 |
2001年 | 9篇 |
2000年 | 17篇 |
1999年 | 21篇 |
1998年 | 50篇 |
1997年 | 33篇 |
1996年 | 40篇 |
1995年 | 23篇 |
1994年 | 21篇 |
1993年 | 15篇 |
1992年 | 9篇 |
1991年 | 11篇 |
1990年 | 12篇 |
1989年 | 10篇 |
1988年 | 11篇 |
1987年 | 7篇 |
1986年 | 3篇 |
1985年 | 3篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1971年 | 1篇 |
排序方式: 共有620条查询结果,搜索用时 15 毫秒
41.
This paper proposes a new classification network, the fuzzy C-means based support vector machine (FCM–SVM) and applies it to channel equalisation. In contrast to a kernel-based SVM, the FCM–SVM has a smaller number of parameters while retaining the SVM's good generalisation ability. In FCM–SVM, input training data is clustered by FCM. The output of FCM–SVM is a weighted sum of the degrees where each input data belongs to the clusters. To achieve high generalisation ability, FCM–SVM weights are learned through linear kernel based SVM. Computer simulations illustrate the performance of the suggested network, where the FCM–SVM is used as a channel equaliser. Simulations with white Gaussian and coloured Gaussian noise are performed. This paper also compares simulation results from the FCM–SVM, the Gaussian kernel based SVM and the optimal equaliser. 相似文献
42.
We present a preliminary design and experimental results of psoriasis objects tracking method for color-skin images that utilizes k-means clustering with morphological processing technique. The method is capable of solving unable exactly contoured psoriasis objects problem in color-skin image by adding the morphological reconstruction operation. The key idea of the proposed image processing procedure is the k-means clustering method helps the rough segmentation, then the dilation and erosion method are adapted to refine previous results. In this paper we investigate the possibility of employing this approach for psoriasis image application. The application of the proposed method for tracking psoriasis is demonstrated to help pathologists distinguish exactly its size and region. In this paper, we propose a psoriasis image segmentation procedure to improve the accuracy. The experimental results demonstrate that the misclassification error is very small between the proposed result and hand drawing. 相似文献
43.
Abstract The multiple‐target tracking (MTT) algorithm plays an important role in radar systems. Data association is the most important technique to solve the tracking problems associating dense measurements with existing tracks. A new approach applying Likelihood to measurements and existing tracks in a radar system based on Neural Network computation is investigated in this paper. The proposed algorithm will solve both the data association and the target tracking problems simultaneously. With this approach, the matching between radar measurements and existing target tracks can achieve global relevance. Computer simulation results indicate the ability of this algorithm to keep track of targets under various conditions. 相似文献
44.
Der-Fong Juang Chao-Hsien Lee Chung-Shin Yuan 《The Science of the total environment》2010,408(20):4524-4531
To understand the potential threat of volatile organic compounds (VOCs) to the health of residents living close to a heavily polluted river, this study investigated the species and the concentration of VOCs evaporating from a river and surveyed the health condition of the nearby residents. Air samples were taken seasonally at the upstream, midstream, and downstream water surfaces of the river, and at different locations at certain distances from the river. These samples were analyzed qualitatively and quantitatively through gas chromatography and electron capture detector (GC/ECD) for chlorinated organic compounds, and through gas chromatography and flame ionization detector (GC/FID) for ordinary hydrocarbons. The health data obtained from valid health questionnaires of 908 residents were analyzed through Statistical Package for Social Science (SPSS) software. Twenty-six species of VOCs were identified in the environment adjacent the river, many of which are carcinogenic or believed to be carcinogenic to humans. However, results of this study shows that the VOCs evaporating from the polluted river have not been definitively identified as a major factor of cancer in the residents. However, the risk of suffering from certain chronic diseases may increase in residents living less than 225 m away from the river due to the high levels of evaporated VOCs. Residents living less than 225 m away from the river and with nearby specific industries are 3.130 times more at risk of suffering from chronic diseases than those with no nearby specific industries. 相似文献
45.
Y. S. Tarng W. H. Yang S. C. Juang 《The International Journal of Advanced Manufacturing Technology》2000,16(9):688-694
The use of fuzzy logic in the Taguchi method to optimise the submerged arc welding process with multiple performance characteristics
is reported in this paper. An orthogonal array, the signal-to-noise ratio, multiresponse performance index, and analysis of
variance are employed to study the performance characteristics in the submerged arc welding process. The process parameters,
namely arc current, arc voltage, welding speed, electrode protrusion, and preheat temperature are optimised with considerations
of the performance characteristics, including deposition rate and dilution. Experimental results are provided to confirm the
effectiveness of this approach. 相似文献
46.
47.
48.
Cheng Juang Hwang T.M. Juang J. Wen-Wei Lin 《Quantum Electronics, IEEE Journal of》2000,36(3):300-304
A synchronization scheme using self-pulsating laser diodes in optical chaotic communication is proposed. Optical chaotic light can be obtained by injecting a sinusoidal electronic signal into a self-pulsating laser diode. To synchronize between two identical chaotic systems with different initial conditions, a drive and response system model is constructed according to Pecora and Carroll's theory. Synchronization can be achieved for optical simplex and duplex transmissions provided that the conditional Lyapunov exponents for the drive and response systems are all negative. This approach offers a key step toward realizing optical chaotic modulation and demodulation 相似文献
49.
C. Hsein Juang David Kun Li Sunny Ye Fang Zhuzhao Liu Eng Hui Khor 《Canadian Metallurgical Quarterly》2008,134(8):1050-1058
This paper presents an innovative approach for a probabilistic analysis of liquefaction hazard at a given site in a specified exposure time based on the U.S. Geological Survey (USGS) National Seismic Hazard Maps data. The foundation of this new approach is a simplified procedure for obtaining a joint distribution of peak ground surface acceleration (amax) and moment magnitude of earthquake (Mw) at any given locality in the United States based on the USGS website data. The developed joint probability distribution of amax and Mw can be readily combined with the conditional probability of liquefaction (given a pair of amax and Mw) to obtain the total probability of liquefaction at a given site in a specified exposure time. Detailed formulation of the new approach is presented and demonstrated with examples. 相似文献
50.
Locally anodic oxidation has been performed to fabricate the nanoscale oxide structures on p-GaAs(100) surface, by using an atomic force microscopy (AFM) with the conventional and carbon nanotube (CNT)-attached probes.
The results can be utilized to fabricate the oxide nanodots under ambient conditions in noncontact mode. To investigate the
conversion of GaAs to oxides, micro-Auger analysis was employed to analyze the chemical compositions. The growth kinetics
and the associated mechanism of the oxide nanodots were studied under DC voltages. With the CNT-attached probe the initial
growth rate of oxide nanodots is in the order of ~300 nm/s, which is ~15 times larger than that obtained by using the conventional
one. The oxide nanodots cease to grow practically as the electric field strength is reduced to the threshold value of ~2 × 107 V cm−1. In addition, results indicate that the height of oxide nanodots is significantly enhanced with an AC voltage for both types
of probes. The influence of the AC voltages on controlling the dynamics of the AFM-induced nanooxidation is discussed. 相似文献