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51.
Data races hamper parallel programming and threaten the reliability of future software. This paper proposes the data race
prevention scheme View-Oriented Data race Prevention (VODAP), which can prevent data races in the View-Oriented Parallel Programming
(VOPP) model. VOPP is a novel shared-memory data-centric parallel programming model, which uses views to bundle mutual exclusion
with data access. We have implemented the data race prevention scheme with a memory protection mechanism. Experimental results
show that the extra overhead of memory protection is trivial in our applications. The performance is evaluated and compared
with modern programming models such as OpenMP and Cilk. 相似文献
52.
Yiu-Wing Leung 《Computer Networks》2010,54(1):150-164
53.
Many researches have been devoted to select the kernel parameters, including the centers, kernel width and weights, for fault-free
radial basis function (RBF) neural networks. However, most are concerned with the centers and weights identification, and
fewer focus on the kernel width selection. Moreover, to our knowledge, almost no literature has proposed the effective and
applied method to select the optimal kernel width for faulty RBF neural networks. As is known that the node faults inevitably
take place in real applications, which results in a great many of faulty networks, it will take a lot of time to calculate
the mean prediction error (MPE) for the traditional method, i.e., the test set method. Thus, the letter derives a formula
to estimate the MPE of each candidate width value and then use it to select the optimal one with the lowest MPE value for
faulty RBF neural networks with multi-node open fault. Simulation results show that the chosen optimal kernel width by our
proposed MPE formula is very close to the actual one by the conventional method. Moreover, our proposed MPE formula outperforms
other selection methods used for fault-free neural networks. 相似文献
54.
Squeeze-film damping on microresonators is a significant damping source even when the surrounding gas is highly rarefied. This article presents a general modeling approach based on Monte Carlo (MC) simulations for the prediction of squeeze-film damping on resonators in the free-molecule regime. The generality of the approach is demonstrated in its capability of simulating resonators of any shape and with any accommodation coefficient. The approach is validated using both the analytical results of the free-space damping and the experimental data of the squeeze-film damping on a clamped–clamped plate resonator oscillating at its first flexure mode. The effect of oscillation modes on the quality factor of the resonator has also been studied and semi-analytical approximate models for the squeeze-film damping with diffuse collisions have been developed. 相似文献
55.
Bert W. Leung Author Vitae Author Vitae Duncan S. Wong Author Vitae 《Pattern recognition》2009,42(5):929-940
Hou [Visual cryptography for color images, Pattern Recognition 36 (2003) 1619-1629] proposed a four-share visual cryptography scheme for color images. The scheme splits a dithered eight-color secret image into four shares: the black mask and other three shares. It was claimed that without knowing the black mask, no information about the secret image can be obtained even if all the other three shares are known. In this paper, we show that this may be true for a few specific two-color secret images only. In all other cases, however, security cannot be guaranteed. We show that an attacker can compromise a randomly chosen two-color secret image from any two of the other three shares with probability by completely recovering the shape and pattern of the secret image. The advantage will increase to if all the three shares are known. If the secret image has three or four colors, we show that the attacker can compromise it with probability and , respectively. Finally, we show that our technique can be extended to compromising secret images with more than four colors. 相似文献
56.
Yuming Zhou Leung H. Baowen Xu 《IEEE transactions on pattern analysis and machine intelligence》2009,35(5):607-623
Previous research shows that class size can influence the associations between object-oriented (OO) metrics and fault-proneness and therefore proposes that it should be controlled as a confounding variable when validating OO metrics on fault-proneness. Otherwise, their true associations may be distorted. However, it has not been determined whether this practice is equally applicable to other external quality attributes. In this paper, we use three size metrics, two of which are available during the high-level design phase, to examine the potentially confounding effect of class size on the associations between OO metrics and change-proneness. The OO metrics that are investigated include cohesion, coupling, and inheritance metrics. Our results, based on Eclipse, indicate that: 1) The confounding effect of class size on the associations between OO metrics and change-proneness, in general, exists, regardless of whichever size metric is used; 2) the confounding effect of class size generally leads to an overestimate of the associations between OO metrics and change-proneness; and 3) for many OO metrics, the confounding effect of class size completely accounts for their associations with change-proneness or results in a change of the direction of the associations. These results strongly suggest that studies validating OO metrics on change-proneness should also consider class size as a confounding variable. 相似文献
57.
58.
Multimedia Tools and Applications - Rapid population aging and advances in sensing technologies motivate the development of unobtrusive healthcare systems, designed to unobtrusively collect an... 相似文献
59.
Part-based object retrieval in cluttered environment 总被引:1,自引:0,他引:1
60.
Abstract Teaching with the world-wide web is becoming a common practice in modern education. The web serves two main interrelated functions, namely, retrieval and publication of information. To enhance learning and motivation, the student-as-teacher (SAT) principle was adopted in the study reported in this paper. Students were given the role of teacher of high school students and the general public about the subject matter they learned on a course. To achieve this goal, the students created educational web sites featuring two selected psychological professions. Being the major assignment for the course, the web sites created by students received higher scores than the assignments of their peers who learned the same materials through traditional pedagogical approaches. Course evaluation confirmed that the web implementation of the SAT principle enhanced learning, increased motivation and provided a transfer-able skill, without compromising accomplishment of major course goals. 相似文献