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   229篇
  免费   9篇
电工技术   2篇
化学工业   39篇
金属工艺   10篇
机械仪表   7篇
建筑科学   4篇
能源动力   8篇
轻工业   20篇
石油天然气   2篇
无线电   16篇
一般工业技术   66篇
冶金工业   23篇
原子能技术   3篇
自动化技术   38篇
  2023年   5篇
  2022年   2篇
  2021年   5篇
  2020年   4篇
  2019年   3篇
  2018年   4篇
  2017年   4篇
  2016年   7篇
  2015年   3篇
  2014年   11篇
  2013年   16篇
  2012年   9篇
  2011年   10篇
  2010年   13篇
  2009年   7篇
  2008年   11篇
  2007年   9篇
  2006年   16篇
  2005年   8篇
  2004年   9篇
  2003年   8篇
  2002年   2篇
  2001年   4篇
  2000年   2篇
  1999年   2篇
  1998年   5篇
  1997年   5篇
  1996年   7篇
  1995年   6篇
  1994年   3篇
  1993年   5篇
  1992年   3篇
  1991年   3篇
  1989年   2篇
  1988年   4篇
  1987年   3篇
  1984年   4篇
  1983年   2篇
  1982年   1篇
  1981年   4篇
  1980年   4篇
  1979年   1篇
  1976年   1篇
  1975年   1篇
排序方式: 共有238条查询结果,搜索用时 611 毫秒
1.
2.
We present two proactive resource allocation algorithms, RBA*-FT and OBA-FT, for fault-tolerant asynchronous real-time distributed systems. The algorithms consider an application model where task timeliness is specified by Jensen's benefit functions and the anticipated application workload during future time intervals is described by adaptation functions. In addition, we assume that reliability functions of processors are available a priori. Given these models, our objective is to maximize aggregate task benefit and minimize aggregate missed deadline ratio in the presence of processor failures. Since determining the optimal solution is computationally intractable, the algorithms heuristically compute sub-optimal resource allocations, but in polynomial time. Experimental results reveal that RBA*-FT and OBA-FT outperform their non-fault-tolerant counterparts in the presence of processor failures. Furthermore, RBA*-FT performs better than OBA-FT, although OBA-FT incurs better worst-case and amortized computational costs. Finally, we observe that both algorithms robustly withstand errors in the estimation of anticipated failures.  相似文献   
3.
An algorithm for reconstructing a binary array of size N sx N from its forest of quadtree representation is presented. The algorithm traverses each tree of the forest in preorder and maps each ‘black’ node into the spatial domain. The time complexity in mapping is O(log N × Bn + Bp), where Bn is the number of black nodes in the forest and Bp is the number of black pixels in the N × N array. The algorithm has been implemented on an Apple II.  相似文献   
4.
Inventory aggregation, also called Risk Pooling, is one of the most efficient ways to reduce the level of safety stocks thereby reducing inventory across the supply chain. Determining the best level of aggregation is a difficult problem and needs extensive study of all the possible scenarios that can affect this decision. Minimizing costs in a supply chain is no longer the sole priority of businesses. Maintaining a high level of responsiveness is also considered equally important. The conflicting nature of these two criteria makes the solution of the problem difficult. In this paper, we develop a bi-criteria nonlinear stochastic integer programming model to determine the best supply chain distribution network to meet customer demands, where minimizing costs while maintaining high levels of responsiveness is important. We develop a two-stage optimization algorithm to solve this problem.  相似文献   
5.
This study was conducted to determine the effect of clay content in GFRP (glass‐fiber‐reinforced polymer) composite samples as they were aged in an alkaline solution. Two kinds of GFRP composite samples were prepared. One was E‐glass‐fiber‐reinforced vinyl ester polymer, and the other was nano‐GFRP composites prepared with the addition of 1 and 2 wt% of montmorillonite clay to the polymer matrix. These samples were aged in alkaline solution of pH 13.2 with and without sustained load. The load was 1335 N or 18.7% of the tensile strength of the composite samples. The aging was evaluated by measuring the reduction in tensile strength after 6 months. Also, absorption of alkaline solution into the plain and nano‐GFRP samples was investigated so as to elucidate the diffusion behaviors. It was found that for a short exposure time (e.g. 1 month) and without sustained load, dispersing 2 wt% of the nanoclay in the polymer matrix of the GFRP samples reduces the diffusivity by 39%. However, with the application of sustained load, the glass fiber composite samples deteriorate more with increasing clay content. The reduction in tensile strength was 7.1%, 12.1%, and 18.1% for the samples containing 0, 1, and 2 wt% of clay, respectively. J. VINYL. ADDIT. TECHNOL., 12:25–32, 2006. © 2006 Society of Plastics Engineers  相似文献   
6.
We present a computational model that highlights the role of basal ganglia (BG) in generating simple reaching movements. The model is cast within the reinforcement learning (RL) framework with correspondence between RL components and neuroanatomy as follows: dopamine signal of substantia nigra pars compacta as the temporal difference error, striatum as the substrate for the critic, and the motor cortex as the actor. A key feature of this neurobiological interpretation is our hypothesis that the indirect pathway is the explorer. Chaotic activity, originating from the indirect pathway part of the model, drives the wandering, exploratory movements of the arm. Thus, the direct pathway subserves exploitation, while the indirect pathway subserves exploration. The motor cortex becomes more and more independent of the corrective influence of BG as training progresses. Reaching trajectories show diminishing variability with training. Reaching movements associated with Parkinson's disease (PD) are simulated by reducing dopamine and degrading the complexity of indirect pathway dynamics by switching it from chaotic to periodic behavior. Under the simulated PD conditions, the arm exhibits PD motor symptoms like tremor, bradykinesia and undershooting. The model echoes the notion that PD is a dynamical disease.  相似文献   
7.
Electrical resistivity of plasma-sprayed titanium diboride coatings   总被引:6,自引:0,他引:6  
Plasma-sprayed TiB2 coatings (50–600 m thick) on alumina substrates have been developed and characterized. X-ray diffraction studies, thermal analysis and oxygen analysis of the coatings show that there is appreciable oxidation of TiB2 during the spray process. Partial oxidation of the boride during spraying strongly influences the electrical conductivity of the coatings, which is found to be 100–1000 times less than that of pure TiB2. Although use of argon as shield gas during the spray process brings down the resisitivity substantially, partial oxidation of TiB2 could not be totally avoided.  相似文献   
8.
Summary In this paper we have used the method of characteristics developed for two dimensional unsteady flow problems to study a simplified axial turbine problem. The system consists of two sets of blades —the guiding vanes which are fixed and the rotor blades which move perpendicular to these vanes. The initial undisturbed constant flow in the system is perturbed by introducing a small velocity normal to the rotor blades to simulate a slight constant inclination. The resulting perturbed flow is periodic after the first three cycles. We have studied the perturbed density distribution throughout the system during a period.
Der Einfluß der Bewegung eines Laufschaufelgitters auf ein Leitschaufelgitter
Zusammenfassung In der vorliegenden Arbeit wird das Charakteristikenverfahren für zweidimensionale instationäre Strömungen auf ein Problem der Axialturbinen angewandt. Das System besteht aus zwei Gitterreihen, den feststehenden Leitschaufeln und den hierzu senkrecht bewegten Laufschaufeln. Die anfangs ungestörte konstante Strömung wird gestört, indem den Laufschaufeln eine geringe Normalgeschwindigkeit erteilt wird, um eine konstante Anstellung zu simulieren. Die gestörte Strömung ist periodisch nach den ersten drei Perioden. Berechnet wurde das gestörte Dichtefeld während einer Periode.

List of Symbols d distance between guide vanes - angle of inclination of rotor blades - W 0 constant velocity of rotor blades perpendicular to the guide vanes - U 0 initial steady streaming parallel flow between the guiding vanes - V p velocity perpendicular to the rotor blades to simulate inclination of the blades - x coordinate parallel to the guide vanes - y coordinate perpendicular to the guide vanes - t time - u, v velocity componente inx, y directions, respectively - a 0 undisturbed sound velocity in the system - a perturbed sound velocity - M 0=U 0/a 0 nondimensional quantity corresponding toU 0 - N 0=W 0/a 0 nondimensional quantity corresponding toW 0 - V 0=V p0/a 0 nondimensional quantity corresponding toV p0 - nondimensional coordinates corresponding tox, y, t, respectively - nondimensional quantity corresponding toa - nondimensional quantities corresponding tou, v respectively With 5 FiguresThis work was done during the award of an Alexander Von Humboldt Fellowship at the DFVLR-Aerodynamische Versuchsanstalt, Institut für Strömungsmechanik, Göttingen, Federal Republic of Germany.  相似文献   
9.
R. Usha  R. Ravindran  B. Uma 《Acta Mechanica》2005,179(1-2):25-39
Summary The thermal effects on the dynamics of an axisymmetric flow of a non-volatile incompressible viscous thin liquid film on a rotating disk due to viscosity variation depending exponentially on temperature are considered. The nonlinear evolution equation is solved numerically. The numerical results reveal that heating the film from below enhances the rate of thinning. The increase in Biot number increases the film thickness, when the film is heated from below. Further, the relative amount of fluid retained on the substrate decreases as the film is heated from below. The results are reversed for the case of a film which is cooled from below. The rate of thinning of the film is more (less) for the case of temperature dependent viscosity when the film is heated (cooled) from below than for the case of constant viscosity of the fluid.  相似文献   
10.
We present a framework, called meta scheduler, for implementing real-time scheduling algorithms. The meta scheduler is a portable middleware layer component designed for implementations over POSIX-compliant operating systems. It accommodates pluggable real-time scheduling algorithms while offering the flexibility of platform independence - the singular underlying OS requirement is the now nearly ubiquitous POSIX compliance. The versatility of pluggable schedulers positions the meta scheduler for deployment in an interoperable heterogeneous real-time environment. We present the design of the meta scheduler and outline its implementation. Furthermore, we present a mechanized correctness verification using the UPPAAL model checker. Prototype implementation of the meta scheduler over QNX Neutrino real-time operating system demonstrates high performance and a small footprint.  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