全文获取类型
收费全文 | 654篇 |
免费 | 32篇 |
国内免费 | 4篇 |
专业分类
电工技术 | 10篇 |
化学工业 | 173篇 |
金属工艺 | 13篇 |
机械仪表 | 8篇 |
建筑科学 | 25篇 |
能源动力 | 38篇 |
轻工业 | 73篇 |
水利工程 | 3篇 |
石油天然气 | 4篇 |
无线电 | 86篇 |
一般工业技术 | 103篇 |
冶金工业 | 54篇 |
原子能技术 | 4篇 |
自动化技术 | 96篇 |
出版年
2023年 | 10篇 |
2022年 | 19篇 |
2021年 | 27篇 |
2020年 | 19篇 |
2019年 | 23篇 |
2018年 | 25篇 |
2017年 | 19篇 |
2016年 | 21篇 |
2015年 | 14篇 |
2014年 | 22篇 |
2013年 | 52篇 |
2012年 | 29篇 |
2011年 | 35篇 |
2010年 | 28篇 |
2009年 | 44篇 |
2008年 | 37篇 |
2007年 | 24篇 |
2006年 | 12篇 |
2005年 | 18篇 |
2004年 | 10篇 |
2003年 | 18篇 |
2002年 | 18篇 |
2001年 | 7篇 |
2000年 | 6篇 |
1999年 | 7篇 |
1998年 | 19篇 |
1997年 | 20篇 |
1996年 | 15篇 |
1995年 | 7篇 |
1994年 | 5篇 |
1993年 | 9篇 |
1992年 | 3篇 |
1991年 | 6篇 |
1990年 | 4篇 |
1989年 | 10篇 |
1987年 | 3篇 |
1986年 | 4篇 |
1984年 | 3篇 |
1983年 | 5篇 |
1982年 | 5篇 |
1981年 | 4篇 |
1980年 | 2篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1976年 | 4篇 |
1975年 | 5篇 |
1969年 | 1篇 |
1968年 | 1篇 |
1966年 | 1篇 |
1958年 | 1篇 |
排序方式: 共有690条查询结果,搜索用时 140 毫秒
31.
Youssef Travaly Mikhail Baklanov 《集成电路应用》2009,(1):37-40
随着对新化学品和集成方案了解的加深,我们不但可以减轻介电层孔隙率增加引起的负担还可以降低工艺对超低k薄膜的损伤。 相似文献
32.
Study of features based on nonlinear dynamical modeling in ECG arrhythmia detection and classification 总被引:3,自引:0,他引:3
Owis MI Abou-Zied AH Youssef AB Kadah YM 《IEEE transactions on bio-medical engineering》2002,49(7):733-736
We present a study of the nonlinear dynamics of electrocardiogram (ECG) signals for arrhythmia characterization. The correlation dimension and largest Lyapunov exponent are used to model the chaotic nature of five different classes of ECG signals. The model parameters are evaluated for a large number of real ECG signals within each class and the results are reported. The presented algorithms allow automatic calculation of the features. The statistical analysis of the calculated features indicates that they differ significantly between normal heart rhythm and the different arrhythmia types and, hence, can be rather useful in ECG arrhythmia detection. On the other hand, the results indicate that the discrimination between different arrhythmia types is difficult using such features. The results of this work are supported by statistical analysis that provides a clear outline for the potential uses and limitations of these features. 相似文献
33.
Solouma NH Youssef AB Badr YA Kadah YM 《IEEE transactions on bio-medical engineering》2002,49(9):1059-1067
A new system is proposed for tracking sensitive areas in the retina for computer-assisted laser treatment of choroidal neovascularization (CNV). The system consists of a fundus camera using red-free illumination mode interfaced to a computer that allows real-time capturing of video input. The first image acquired is used as the reference image and utilized by the treatment physician for treatment planning. A grid of seed contours over the whole image is initiated and allowed to deform by splitting and/or merging according to preset criteria until the whole vessel tree is demarcated. Then, the image is filtered using a one-dimensional Gaussian filter in two perpendicular directions to extract the core areas of such vessels. Faster segmentation can be obtained for subsequent images by automatic registration to compensate for eye movement and saccades. An efficient registration technique is developed whereby some landmarks are detected in the reference frame then tracked in the subsequent frames. Using the relation between these two sets of corresponding points, an optimal transformation can be obtained. The implementation details of proposed strategy are presented and the obtained results indicate that it is suitable for real-time location determination and tracking of treatment positions. 相似文献
34.
Ahmed A. Youssef 《Analog Integrated Circuits and Signal Processing》2006,46(3):193-201
This paper presents the design considerations for the noise optimization of fully integrated tuned low-noise amplifiers (LNA)
based on the four noise parameters and two-port noise theory. Specifically, this paper provides the design guidelines for
a 0.18 μm CMOS tuned LNA. These guidelines give a useful indication to the design tradeoffs associated with noise figure,
power dissipation and gate overdrive voltage for the LNA designed using this technology. As a case study, a 10 GHz LNA has
been designed using 0.18 μm CMOS technology for a wireless LAN application. The amplifier has a 2.4 dB noise figure with a
−13 dBm third-order input intercept point, while drawing 5 mW from a 1.8 V power supply. The results show that the proposed
theoretical contours of constant noise figure which relate the gate overdrive voltage and power dissipation can accurately
predict the noise performance of a 0.18 μm CMOS LNA design
Ahmed A. Youssef received the B.Sc. (Hon.) and M.Sc. degrees both in electrical engineering from Ain Shams University, Cairo, Egypt, in 1998
and 2002, respectively. Since 2003, he has been with the University of Calgary, AB, Canada, where he is currently working
toward the Ph.D. degree in RF integrated circuits and systems.
Mr. Youssef has joined the Wireless Research Center at TRLab, Alberta, Canada as a research associate in 2004. His research
interests include the analog high speed integrated circuit for the wireless LAN applications.
Mr. Youssef is the recipient of the Mobinil Telecommunication Inc. Pre-master Fellowship in 1999. He also received the Young
Scientist award at the Maastricht General Assembly of the International Union of Radio Science in 2002 and an Honorable Mention
at 2003 in the Symposium of the Microelectronics Research & Development in Canada, Montreal. Mr. Youssef received the Gordon
Lewis Hedberg Doctoral Scholarship in 2005. 相似文献
35.
Novel Approach to Integration of Numerical Modeling and Field Observations for Deep Excavations 总被引:1,自引:0,他引:1
Youssef M. A. Hashash Camilo Marulanda Jamshid Ghaboussi Sungmoon Jung 《Canadian Metallurgical Quarterly》2006,132(8):1019-1031
Precedent and observation of performance are an essential part of the design and construction process in geotechnical engineering. For deep urban excavations designers rely on empirical data to estimate potential deformations and impact on surrounding structures. Numerical simulations are also employed to estimate induced ground deformations. Significant resources are dedicated to monitor construction activities and control induced ground deformations. While engineers are able to learn from observations, numerical simulations have been unable to fully benefit from information gained at a given site or prior excavation case histories in the same area. A novel analysis method, self-learning in engineering simulations (SelfSim), is introduced to integrate precedent into numerical simulations. SelfSim is an inverse analysis technique that combines finite element method, biologically inspired material models, and field measurements. SelfSim extracts relevant constitutive soil information from field measurements of excavation response such as lateral wall deformations and surface settlement. The resulting soil model, used in a numerical analysis, provides correct ground deformations and can be used in estimating deformations of similar excavations. The soil model can continuously evolve using additional field information. SelfSim is demonstrated using two excavation case histories in Boston and Chicago. 相似文献
36.
Instead of providing separate solutions for each individual network, a unified theory is desirable to cover the study of a
class of networks. Cartesian product graphs provide a common framework to investigate the performance of several individual
networks. This paper addresses communication capabilities of product networks. Communication cost is generally characterized
by the diameter, the average distance, the total number of paths, the traffic intensity, the saturation level, the queue length
in each node, the communication delay and the network throughput. The diameter and average distance of product networks have
been studied. However, no work has addressed the remaining measures for product networks. This paper presents a unified theory
to evaluate the traffic intensity and the saturation level of product networks. We have theoretically computed the traffic
intensity and the saturation level. Intensive simulations have been conducted to validate the analytical results and to compute
the other measures for different workloads, different networks, and different network sizes. Examples of product networks
that have been investigated are multidimensional meshes, multidimensional toruses, and r‐ary n‐cube networks. We have also shown that the structure (geometry) of a network is a primary factor for network high performance.
For meshes and toruses, square networks present an optimal structure. While in case of an r‐ary n‐cubes, networks with higher radix outperform those with smaller radix. In particular, cross‐cubes (4‐ary n‐cube) are shown to perform better than binary cubes.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
37.
The École de technologie supérieure (ÉTS) of the University of Québec is offering Design of Experiments (DOE) courses for more than a decade within its undergraduate certificate program of Quality Management and Assurance (QMA). Previous teaching experiences showed that the conceptual aspects of DOE has been somehow difficult to be rapidly and efficiently assimilated by the part-time adult students. Although DOE have proved to be very effective in improving quality throught process parameters' optimization, many engineers rejected the idea of applying the technique on the floor level because of the conceptual and statistical barriers. For these reasons, the authors have developed and introduced a new teaching approach in order to clarify the conceptual aspects and simplify the mechanics underlying the DOE techniques and, therefore, help the students to better understand and implement DOE at the work place. The approach is mainly based on the use of simple and straight forward calculation-and-analysis worksheets that have been developed for the most commonly used experimental designs (full factorial, screening factorial, screening fractionnal factorial and Taguchi arrays). In this paper, the authors present the approach with a sample of the most pertinent calculation-and-analysis worksheets used along with a practical example. 相似文献
38.
In this note we show that the filtering phase error variance for the optimal phase demodulator is independent of plant noise spectral density and depends only on output noise-to-signal ratio for the optimal phase demodulator. Hence, our Monte Carlo results are complete. 相似文献
39.
We have investigated a method for solving the inverse problem of determining the optical properties of a two-layer turbid model. The method is based on deducing the optical properties (OPs) of the top layer from the absolute spatially resolved reflectance that results from photon migration within only the top layer by use of a multivariate calibration model. Then the OPs of the bottom layer are deduced from relative frequency-domain (FD) reflectance measurements by use of the two-layer FD diffusion model. The method was validated with Monte Carlo FD reflectance profiles and experimental measurements of two-layer phantoms. The results showed that the method is useful for two-layer models with interface depths of >5 mm; the OPs were estimated, within a relatively short time (<1 min), with a mean error of <10% for the Monte Carlo reflectance profiles and with errors of <25% for the phantom measurements. 相似文献
40.
Karine Guillouard Philippe Bertin Youssef Khouaja Jean-Christophe Rault Jean-Marie Bonnin 《电信纪事》2003,58(3-4):369-396
This article presents a network-controlled approach of user terminal mobility within anIP based WirelessLAN Access Network. In a first part, this article makes a review of the mobility support, on the subject of emergingWLAN technologies asHIPERLAN/2 andIEEE 802.11, on the one hand, and, regardingIP networks as currently studied withinIETF, on the other hand. Both types ofIP mobility protocols are presented, either global mobility protocols such as MobileIP, or local mobility management protocols (micro mobility). In the next part, the overall principles of our mobility management approach are explained; this approach is based on the implementation of a new network entity dedicated to the control of user terminal mobility. The last part details a practical implementation of this approach. The implementation is carried out on the basis of Hierarchical MobileIPv6 (HMIPv6). The experimental results confirm the importance to carefully plan and control the user terminal mobility within largeIP based Access Networks, as this brings benefit to the user as well as to the operator. 相似文献