全文获取类型
收费全文 | 11193篇 |
免费 | 1055篇 |
国内免费 | 13篇 |
专业分类
电工技术 | 97篇 |
综合类 | 9篇 |
化学工业 | 2725篇 |
金属工艺 | 134篇 |
机械仪表 | 307篇 |
建筑科学 | 537篇 |
矿业工程 | 28篇 |
能源动力 | 288篇 |
轻工业 | 2267篇 |
水利工程 | 94篇 |
石油天然气 | 24篇 |
武器工业 | 1篇 |
无线电 | 842篇 |
一般工业技术 | 1974篇 |
冶金工业 | 983篇 |
原子能技术 | 57篇 |
自动化技术 | 1894篇 |
出版年
2024年 | 37篇 |
2023年 | 150篇 |
2022年 | 141篇 |
2021年 | 369篇 |
2020年 | 297篇 |
2019年 | 299篇 |
2018年 | 387篇 |
2017年 | 396篇 |
2016年 | 503篇 |
2015年 | 469篇 |
2014年 | 608篇 |
2013年 | 1102篇 |
2012年 | 945篇 |
2011年 | 774篇 |
2010年 | 551篇 |
2009年 | 570篇 |
2008年 | 605篇 |
2007年 | 509篇 |
2006年 | 471篇 |
2005年 | 332篇 |
2004年 | 293篇 |
2003年 | 255篇 |
2002年 | 247篇 |
2001年 | 152篇 |
2000年 | 154篇 |
1999年 | 132篇 |
1998年 | 201篇 |
1997年 | 173篇 |
1996年 | 117篇 |
1995年 | 114篇 |
1994年 | 100篇 |
1993年 | 92篇 |
1992年 | 62篇 |
1991年 | 51篇 |
1990年 | 34篇 |
1989年 | 35篇 |
1988年 | 29篇 |
1987年 | 25篇 |
1986年 | 38篇 |
1985年 | 41篇 |
1984年 | 42篇 |
1983年 | 31篇 |
1982年 | 36篇 |
1981年 | 33篇 |
1980年 | 25篇 |
1979年 | 35篇 |
1978年 | 18篇 |
1977年 | 16篇 |
1976年 | 30篇 |
1973年 | 14篇 |
排序方式: 共有10000条查询结果,搜索用时 8 毫秒
81.
82.
83.
The Journal of Supercomputing - This article presents a set of linear regression models to predict the impact of task migration on different objectives, like performance and energy consumption. It... 相似文献
84.
Rodríguez-de-Vera Jesús M. González-Carrillo Josefa García José M. Bernabé Gregorio 《The Journal of supercomputing》2021,77(9):10138-10151
The Journal of Supercomputing - Left ventricular non-compaction (LVNC) is a rare cardiomyopathy characterized by abnormal trabeculations in the left ventricle cavity. Although traditional computer... 相似文献
85.
Michel P. Tcheou André L.L. Miranda Lisandro Lovisolo Eduardo A.B. da Silva Marco A.M. Rodrigues Paulo S.R. Diniz 《Digital Signal Processing》2012,22(2):288-297
In this paper, we verify how far electric disturbance signals can be compressed without compromising the analysis of encoded fault records. A recently proposed compression algorithm, referred to as Damped Sinusoidal Matching Pursuit (DSMP) has the remarkable feature of obtaining both compact and physically interpretable representations. However, for fault analysis applications, one is primarily interested in how accurate can be the analysis performed on compressed signals, instead of evaluating mean-squared error figures. Unlike previous works in digital fault records compression, the performance of the DSMP compression method is evaluated using a protocol based on fault analysis procedures commonly performed by expert engineers. This protocol is applied for comparing the results obtained in the analysis of both uncompressed records and their compressed versions at different compression ratios. The results show that the DSMP is a reliable compression system since it achieves high compression ratios (6.4:1) without causing fault analysis misinterpretation. 相似文献
86.
In this paper, a low complexity data demodulation algorithm is proposed that requires time of arrival information of the received signal exclusively. As an application example, the algorithm is applied to an ultra-wideband impulse radio communication system with pulse position modulation. The algorithm is insensitive to a common time delay for all pulses, that means, it does not require an accurate synchronization between the transmitter and the receiver. For the performance estimation, only a symbol synchronization is assumed, i.e., that there is a priori knowledge which pulse marks the beginning of a received data symbol. The performance of the proposed algorithm is evaluated for straightforward time of arrivals estimators, such as a maximum detector or a threshold detector. It is shown that the proposed algorithm outperforms a least squares algorithm in all considered scenarios. In particular, an increased robustness against additive white Gaussian noise, impulse like noise, and multiuser interference is demonstrated as well as an improved performance for multipath propagation channels. 相似文献
87.
Lasserre S Hernando J Hill S Schümann F Anasagasti Pde M Jaoudé GA Markram H 《IEEE transactions on visualization and computer graphics》2012,18(2):214-227
We present a process to automatically generate three-dimensional mesh representations of the complex, arborized cell membrane surface of cortical neurons (the principal information processing cells of the brain) from nonuniform morphological measurements. Starting from manually sampled morphological points (3D points and diameters) from neurons in a brain slice preparation, we construct a polygonal mesh representation that realistically represents the continuous membrane surface, closely matching the original experimental data. A mapping between the original morphological points and the newly generated mesh enables simulations of electrophysiolgical activity to be visualized on this new membrane representation. We compare the new mesh representation with the state of the art and present a series of use cases and applications of this technique to visualize simulations of single neurons and networks of multiple neurons. 相似文献
88.
Motion is a key feature for a wide class of computer vision approaches to recognize actions. In this article, we show how to define bio-inspired features for action recognition. To do so, we start from a well-established bio-inspired motion model of cortical areas V1 and MT. The primary visual cortex, designated as V1, is the first cortical area encountered in the visual stream processing and early responses of V1 cells consist in tiled sets of selective spatiotemporal filters. The second cortical area of interest in this article is area MT where MT cells pool incoming information from V1 according to the shape and characteristic of their receptive field. To go beyond the classical models and following the observations from Xiao et al. [61], we propose here to model different surround geometries for MT cells receptive fields. Then, we define the so-called bio-inspired features associated to an input video, based on the average activity of MT cells. Finally, we show how these features can be used in a standard classification method to perform action recognition. Results are given for the Weizmann and KTH databases. Interestingly, we show that the diversity of motion representation at the MT level (different surround geometries), is a major advantage for action recognition. On the Weizmann database, the inclusion of different MT surround geometries improved the recognition rate from 63.01 ± 2.07% up to 99.26 ± 1.66% in the best case. Similarly, on the KTH database, the recognition rate was significantly improved with the inclusion of MT different surround geometries (from 47.82 ± 2.71% up to 92.44 ± 0.01% in the best case). We also discussed the limitations of the current approach which are closely related to the input video duration. These promising results encourage us to further develop bio-inspired models incorporating other brain mechanisms and cortical areas in order to deal with more complex videos. 相似文献
89.
Jose Saldana Julián Fernández-Navajas José Ruiz-Mas Jenifer Murillo Eduardo Viruete Navarro José I. Aznar 《Computer Networks》2012,56(7):1893-1919
This work presents a study of RTP multiplexing schemes, which are compared with the normal use of RTP, in terms of experienced quality. Bandwidth saving, latency and packet loss for different options are studied, and some tests of Voice over IP (VoIP) traffic are carried out in order to compare the quality obtained using different implementations of the router buffer. Voice quality is calculated using ITU R-factor, which is a widely accepted quality estimator. The tests show the bandwidth savings of multiplexing, and also the importance of packet size for certain buffers, as latency and packet loss may be affected. The customer’s experience improvement is measured, showing that the use of multiplexing can be interesting in some scenarios, like an enterprise with different offices connected via the Internet. The system is also tested using different numbers of samples per packet, and the distribution of the flows into different tunnels is found to be an important factor in order to achieve an optimal perceived quality for each kind of buffer. Grouping all the flows into a single tunnel will not always be the best solution, as the increase of the number of flows does not improve bandwidth efficiency indefinitely. If the buffer penalizes big packets, it will be better to group the flows into a number of tunnels. The router processing capacity has to be taken into account too, as the limit of packets per second it can manage must not be exceeded. The obtained results show that multiplexing is a good way to improve customer’s experience of VoIP in scenarios where many RTP flows share the same path. 相似文献
90.
C?t?lin Bu?neag Dana Piciu 《Soft Computing - A Fusion of Foundations, Methodologies and Applications》2012,16(10):1639-1655
The spectrum of a residuated lattice L is the set Spec(L) of all prime i-filters. It is well known that Spec(L) can be endowed with the spectral topology. The main scope of this paper is to introduce and study another topology on Spec(L),?the so called stable topology, which turns out to be coarser than the spectral one. With this and in view, we introduce the notions of pure i-filter for a residuated lattice and the notion of normal residuated lattice. So, we generalize to case of residuated lattice some results relative to MV-algebras (Belluce and Sessa in Quaest Math 23:269–277, 2000; Cavaccini et?al. in Math Japonica 45(2):303–310, 1997) or BL-algebras (Eslami and Haghani in Kybernetika 45:491–506, 2009; Leustean in Central Eur J Math 1(3): 382–397, 2003; Turunen and Sessa in Mult-Valued Log 6(1–2):229–249, 2001). 相似文献