全文获取类型
收费全文 | 1459篇 |
免费 | 47篇 |
专业分类
电工技术 | 19篇 |
化学工业 | 142篇 |
金属工艺 | 29篇 |
机械仪表 | 17篇 |
建筑科学 | 61篇 |
矿业工程 | 27篇 |
能源动力 | 27篇 |
轻工业 | 127篇 |
水利工程 | 15篇 |
石油天然气 | 22篇 |
武器工业 | 1篇 |
无线电 | 209篇 |
一般工业技术 | 174篇 |
冶金工业 | 266篇 |
原子能技术 | 4篇 |
自动化技术 | 366篇 |
出版年
2023年 | 10篇 |
2022年 | 9篇 |
2021年 | 23篇 |
2020年 | 20篇 |
2019年 | 26篇 |
2018年 | 27篇 |
2017年 | 40篇 |
2016年 | 44篇 |
2015年 | 33篇 |
2014年 | 55篇 |
2013年 | 79篇 |
2012年 | 59篇 |
2011年 | 103篇 |
2010年 | 86篇 |
2009年 | 71篇 |
2008年 | 87篇 |
2007年 | 84篇 |
2006年 | 75篇 |
2005年 | 65篇 |
2004年 | 60篇 |
2003年 | 56篇 |
2002年 | 31篇 |
2001年 | 31篇 |
2000年 | 13篇 |
1999年 | 25篇 |
1998年 | 27篇 |
1997年 | 25篇 |
1996年 | 58篇 |
1995年 | 27篇 |
1994年 | 19篇 |
1993年 | 19篇 |
1992年 | 13篇 |
1991年 | 4篇 |
1990年 | 7篇 |
1989年 | 8篇 |
1988年 | 8篇 |
1987年 | 11篇 |
1986年 | 8篇 |
1985年 | 9篇 |
1984年 | 9篇 |
1983年 | 4篇 |
1982年 | 6篇 |
1981年 | 7篇 |
1980年 | 4篇 |
1979年 | 4篇 |
1978年 | 4篇 |
1977年 | 3篇 |
1976年 | 8篇 |
1975年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有1506条查询结果,搜索用时 15 毫秒
21.
Bingbing Nie Taewung Kim Yan Wang Varun Bollapragada Tom Daniel Jeff R. Crandall 《Multibody System Dynamics》2016,38(3):297-316
Dimensional scaling approaches are widely used to develop multi-body human models in injury biomechanics research. Given the limited experimental data for any particular anthropometry, a validated model can be scaled to different sizes to reflect the biological variance of population and used to characterize the human response. This paper compares two scaling approaches at the whole-body level: one is the conventional mass-based scaling approach which assumes geometric similarity; the other is the structure-based approach which assumes additional structural similarity by using idealized mechanical models to account for the specific anatomy and expected loading conditions. Given the use of exterior body dimensions and a uniform Young’s modulus, the two approaches showed close values of the scaling factors for most body regions, with 1.5 % difference on force scaling factors and 13.5 % difference on moment scaling factors, on average. One exception was on the thoracic modeling, with 19.3 % difference on the scaling factor of the deflection. Two 6-year-old child models were generated from a baseline adult model as application example and were evaluated using recent biomechanical data from cadaveric pediatric experiments. The scaled models predicted similar impact responses of the thorax and lower extremity, which were within the experimental corridors; and suggested further consideration of age-specific structural change of the pelvis. Towards improved scaling methods to develop biofidelic human models, this comparative analysis suggests further investigation on interior anatomical geometry and detailed biological material properties associated with the demographic range of the population. 相似文献
22.
Jeff Flynn 《Information Security Journal: A Global Perspective》2013,22(4):22-28
Abstract There is a level of sensitivity to almost all data, but what is most important — keeping sensitive data sensitive or guaranteeing the integrity of the data? When it comes to sensitivity or integrity, access control models have provided several options. Yet, wouldn't a combination of access control models provide a more desirable result than just settling for one? Is it possible to have a slice of data sensitivity with a dollop of data integrity? In finding the answer to this question it must be understood exactly what an access control model is and, in terms of sensitivity and integrity, which models provide the best security. 相似文献
23.
Peyman Afshani Pankaj K. Agarwal Lars Arge Kasper Green Larsen Jeff M. Phillips 《Theory of Computing Systems》2013,52(3):342-366
Given a set of points with uncertain locations, we consider the problem of computing the probability of each point lying on the skyline, that is, the probability that it is not dominated by any other input point. If each point’s uncertainty is described as a probability distribution over a discrete set of locations, we improve the best known exact solution. We also suggest why we believe our solution might be optimal. Next, we describe simple, near-linear time approximation algorithms for computing the probability of each point lying on the skyline. In addition, some of our methods can be adapted to construct data structures that can efficiently determine the probability of a query point lying on the skyline. 相似文献
24.
25.
The engineering of distributed adaptive software is a complex task which requires a rigorous approach. Software architectural
(structural) concepts and principles are highly beneficial in specifying, designing, analysing, constructing and evolving
distributed software. A rigorous architectural approach dictates formalisms and techniques that are compositional, components
that are context independent and systems that can be constructed and evolved incrementally. This paper overviews some of the
underlying reasons for adopting an architectural approach, including a brief “rational history” of our research work, and
indicates how an architectural model can potentially facilitate the provision of self-managed adaptive software system.
Much of the research has been supported by the Engineering and Physical Sciences Research Council and is currently partly
supported by EPSRC Platform grant AEDUS 2 and a DTC grant. 相似文献
26.
Cheating is rampant in current gameplay on the Internet. However, it isn't as well understood as we might expect. The authors summarize the various known methods of cheating and define a taxonomy of online game cheating with respect to the underlying vulnerability, consequence, and cheating principal. This taxonomy provides a systematic introduction to the characteristics of cheats in online games and how they can arise. Although cheating in online games is largely due to various security failures, the four traditional aspects of security—confidentiality, integrity, availability, and authenticity—are insufficient to explain it. Instead, fairness becomes a vital additional aspect, and its enforcement provides a convincing perspective for understanding security techniques' role in developing and operating online games. 相似文献
27.
28.
29.
We consider the setting of a multiprocessor where the speeds of the m processors can be individually scaled. Jobs arrive over time and have varying degrees of parallelizability. A nonclairvoyant
scheduler must assign the processes to processors, and scale the speeds of the processors. We consider the objective of energy
plus flow time. We assume that a processor running at speed s uses power s
α
for some constant α>1. For processes that may have side effects or that are not checkpointable, we show an W(m(a-1)/a2)\Omega(m^{(\alpha -1)/\alpha^{2}}) bound on the competitive ratio of any randomized algorithm. For checkpointable processes without side effects, we give an
O(log m)-competitive algorithm. Thus for processes that may have side effects or that are not checkpointable, the achievable competitive
ratio grows quickly with the number of processors, but for checkpointable processes without side effects, the achievable competitive
ratio grows slowly with the number of processors. We then show a lower bound of Ω(log 1/α
m) on the competitive ratio of any randomized algorithm for checkpointable processes without side effects. 相似文献
30.
Jeff Jones 《Natural computing》2011,10(4):1345-1369
The single-celled organism Physarum polycephalum efficiently constructs and minimises dynamical nutrient transport networks resembling proximity graphs in the Toussaint hierarchy.
We present a particle model which collectively approximates the behaviour of Physarum. We demonstrate spontaneous transport network formation and complex network evolution using the model and show that the model
collectively exhibits quasi-physical emergent properties, allowing it to be considered as a virtual computing material. This
material is used as an unconventional method to approximate spatially represented geometry problems by representing network
nodes as nutrient sources. We demonstrate three different methods for the construction, evolution and minimisation of Physarum-like transport networks which approximate Steiner trees, relative neighbourhood graphs, convex hulls and concave hulls. We
extend the model to adapt population size in response to nutrient availability and show how network evolution is dependent
on relative node position (specifically inter-node angle), sensor scaling and nutrient concentration. We track network evolution
using a real-time method to record transport network topology in response to global differences in nutrient concentration.
We show how Steiner nodes are utilised at low nutrient concentrations whereas direct connections to nutrients are favoured
when nutrient concentration is high. The results suggest that the foraging and minimising behaviour of Physarum-like transport networks reflect complex interplay between nutrient concentration, nutrient location, maximising foraging
area coverage and minimising transport distance. The properties and behaviour of the synthetic virtual plasmodium may be useful
in future physical instances of distributed unconventional computing devices, and may also provide clues to the generation
of emergent computation behaviour by Physarum. 相似文献