首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   14395篇
  免费   2861篇
  国内免费   1350篇
电工技术   2398篇
综合类   2201篇
化学工业   222篇
金属工艺   227篇
机械仪表   1410篇
建筑科学   293篇
矿业工程   408篇
能源动力   303篇
轻工业   152篇
水利工程   368篇
石油天然气   618篇
武器工业   243篇
无线电   3035篇
一般工业技术   1168篇
冶金工业   92篇
原子能技术   56篇
自动化技术   5412篇
  2024年   158篇
  2023年   181篇
  2022年   252篇
  2021年   303篇
  2020年   368篇
  2019年   290篇
  2018年   295篇
  2017年   423篇
  2016年   527篇
  2015年   612篇
  2014年   771篇
  2013年   806篇
  2012年   1169篇
  2011年   1312篇
  2010年   1169篇
  2009年   1197篇
  2008年   1343篇
  2007年   1579篇
  2006年   1349篇
  2005年   1132篇
  2004年   848篇
  2003年   706篇
  2002年   466篇
  2001年   411篇
  2000年   334篇
  1999年   220篇
  1998年   148篇
  1997年   112篇
  1996年   59篇
  1995年   28篇
  1994年   14篇
  1993年   13篇
  1992年   3篇
  1991年   2篇
  1990年   2篇
  1989年   1篇
  1986年   2篇
  1979年   1篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
Currently there are design barriers inhibiting the implementation of high-precision digital signal processing (DSP) objects with field programmable logic (FPL) devices. This paper explores overcoming these barriers by fusing together the popular distributed arithmetic (DA) method with the residue number system (RNS) for use in FPL-centric designs. The new design paradigm is studied in the context of a high-performance filter bank and a discrete wavelet transform (DWT). The proposed design paradigm is facilitated by a new RNS accumulator structure based on a carry save adder (CSA). The reported methodology also introduces a polyphase filter structure that results in a reduced look-up table (LUT) budget. The 2C-DA and RNS-DA are compared, in the context of a FPL implementation strategy, using a discrete wavelet transform (DWT) filter bank as a common design theme. The results show that the RNS-DA, compared to a traditional 2C-DA design, enjoys a performance advantage that increases with precision (wordlength).  相似文献   
2.
This essay concentrates on two key procedures of image mosaic--image registration and imagefusion.Becauseof the character of geometric transformation invariance of edge points, wecalculate the angle difference of the direction vector ofedge points in different images anddraw an angle difference histogramto adjust the rotationproblem. Through this way, algorithm based on gray information is expandedandcan be used in images withdisplacementand rotation. Inthe term of image fusion, wavelet multi-scale analysis is used to fuse spliced images. In order to choose the best method of imagefusion,weevaluate the results of different methods of image fusion by cross entropy.  相似文献   
3.
针对重力测定反问题,提出将其离散为线性不适定问题,利用小波变换方法进行数值求解.该方法将小波变换和正则化方法相结合,选取小波函数作为一组基底,将原不适定问题转化为粗子空间上的适定问题,并给出选取粗子空间基的方法.通过数值模拟已有方法和小波变换方法求解结果的比较,表明了小波变换方法的可行性和有效性.  相似文献   
4.
A wavelet based identification method for linear time-varying systems is presented,and the ridge and skeleton of the continuous wavelet transform of free response is used to extract time-varying parameters. The stiffness and damping coefficients of single-degree-of—freedom systems,frequencies and damping ratios of multi-degree-of-freedom systems are estimated without any prior information of systems. The proposed method is applied to linear time-varying systems with both abrupt and smooth variation parameters. Gaussian white noise is added to the response to test the anti-noise performance of the algorithm. The simulation results show that the proposed method is capable of accurately tracking the variation of the systems.  相似文献   
5.
This paper describes a novel model for fetal heart rate (FHR) monitoring from single-lead mother?s abdomen ECG (AECG) measurements. This novel method is divided in two stages: the first step consists on a one-step wavelet-based preprocessing for simultaneous baseline and high-frequency noise suppression, while the second stage efficiently detects fetal QRS complexes allowing FHR monitoring. The presented structure has been simplified as much as possible, in order to reduce computational cost and thus enable possible custom hardware implementations. Moreover, the proposed scheme and its fixed-point modeling have been tested using real abdominal ECG signals, which allow the validation of the presented approach and provide high accuracy.  相似文献   
6.
To provide both a high payload capacity and a good stego-image quality, a high payload frequency-based reversible image hiding (HPFRIH) method was presented in this paper. These performances can be achieved by transforming a cover image from the spatial domain into the frequency domain through Haar digital wavelet transform (HDWT) method followed by an adaptive arithmetic coding method to encode the HDWT coefficients in a high-frequency band. The HPFRIH method was used to conceal both the compressed data and the secret data in the high-frequency band. This simple method can completely reconstruct the cover image only from the stego-image. Moreover, experimental results showed that the HPFRIH method offers both impressive hiding capacity and satisfied stego-image quality.  相似文献   
7.
A supported framework of a gyroscope's rotor is designed and the B-Spline wavelet finite element model of nonlinear supported magnetic field is worked out. A new finite element space is studied in which the scaling function of the B-spline wavelet is considered as the shape function of a tetrahedton. The magnetic field is spited by an artificial absorbing body which used the condition of field radiating, so the solution is unique. The resolution is improved via the varying gradient of the B-spline function under the condition of unchanging gridding. So there are some advantages in dealing with the focus flux and a high varying gradient result from a nonlinear magnetic field. The result is more practical. Plots of flux and in the space is studied via simulating the supported system model. The results of the study are useful in the research of the supported magnetic system for the gyroscope rotor.  相似文献   
8.
对伸缩因子a为大于1的正整数的Haar小波基进行了统一构造,并给出了分解和重构算法。指出只需对一实对称矩阵求特征向量,便容易得到相应的a-1个母小波。  相似文献   
9.
DWT-Based Watermarking Scheme for Digital Images   总被引:2,自引:0,他引:2  
A watermarking scheme for digital images is introduced. This method is based on discrete wavelet transform and spread spectrum technique. A discrete wavelet transformed binary signature image is expanded by an m-sequence and added to the large wavelet coefficients of a host image with a scale factor. Good balance be-tween transparency and robustness is achieved by the selection of the scale factor. In addition, the spread spec-trum technique is adopted to increase the robustness of this watermarking scheme. The experimental results show that the proposed method is of good performance and robustness for common image operations such as JPEG lossy compression, etc.  相似文献   
10.
二维小波变换理论在地震信号去噪中的应用   总被引:3,自引:0,他引:3  
针对地震信号随机干扰和规则干扰的特点,运用二维小波变换的理论,设计了相应的变换域去噪滤波器。理论记录和实际野外记录试算表明,二维小波变换具有较强的信噪分离作用。只要运用得当就能取得满意的效果。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号