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排序方式: 共有197条查询结果,搜索用时 406 毫秒
1.
Chai Gin Boay 《Composite Structures》1996,35(4):357-368
This paper presents finite element results and some experimental data on the free vibration of symmetric laminated composite plates containing a central hole. The varying parameters in the study are the hole sizes, the boundary conditions along the edges of the plate and the aspect ratio of the plate. Hole diameters ranging from 0.1 to 0.9 times the width of the plate and the aspect ratio varying from 1 to 4 were analysed in the numerical study. The other parameters such as the stacking sequence and the lamination materials are kept constant. The stacking sequence and material properties chosen for the study are those typically found in aircraft structural applications. The close correlation between numerical and experimental data provides some confidence in the finite element method used. 相似文献
2.
Kow Ming Chang Yuan Hung Chung Gin Ming Lin 《Electron Device Letters, IEEE》2002,23(5):255-257
Studies the anomalous variations of the OFF-state leakage current (IOFF) in n-channel poly-Si thin-film transistors (TFTs) under static stress. The dominant mechanisms for the anomalous IOFF can be attributed to (1) IOFF increases due to channel hot electrons trapping at the gate oxide/channel interface and silicon grain boundaries and (2) IOFF decreases due to hot holes accumulated/trapped near the channel/bottom oxide interface near the source region. Under the stress of high drain bias, serious impact ionization effect will occur to generate hot electrons and hot holes near the drain region. Some of holes will be injected into the gate oxide due to the vertical field (~(V_Gstress V_Dstress)/T OX) near the drain and the others will be migrated from drain to source along the channel due to lateral electric field (~V_Dstress/LCH) 相似文献
3.
Carrascal Ginés del Barrio Alberto A. Botella Guillermo 《The Journal of supercomputing》2021,77(3):2770-2799
The Journal of Supercomputing - Quantum computing is a reality that presents challenges to computer engineering students and practitioners. It has been claimed that it is possible to effectively... 相似文献
4.
José M. Cecilia José M. García Ginés D. Guerrero Miguel A. Martínez-del-Amor Mario J. Pérez-Jiménez Manuel Ujaldón 《Soft Computing - A Fusion of Foundations, Methodologies and Applications》2012,16(2):231-246
Membrane Computing is a discipline aiming to abstract formal computing models, called membrane systems or P systems, from the structure and functioning of the living cells as well as from the cooperation of cells in tissues, organs, and
other higher order structures. This framework provides polynomial time solutions to NP-complete problems by trading space
for time, and whose efficient simulation poses challenges in three different aspects: an intrinsic massively parallelism of
P systems, an exponential computational workspace, and a non-intensive floating point nature. In this paper, we analyze the
simulation of a family of recognizer P systems with active membranes that solves the Satisfiability problem in linear time
on different instances of Graphics Processing Units (GPUs). For an efficient handling of the exponential workspace created
by the P systems computation, we enable different data policies to increase memory bandwidth and exploit data locality through
tiling and dynamic queues. Parallelism inherent to the target P system is also managed to demonstrate that GPUs offer a valid
alternative for high-performance computing at a considerably lower cost. Furthermore, scalability is demonstrated on the way
to the largest problem size we were able to run, and considering the new hardware generation from Nvidia, Fermi, for a total
speed-up exceeding four orders of magnitude when running our simulations on the Tesla S2050 server. 相似文献
5.
本文研制了一台测量电子束和β射线吸收剂量的外推电离室,其空腔室壁材料可拆换并分别与空气、组织和硅等效,收集电极名义直径为1.5、3、10和30mm,空气空腔可变范围为0.2~15mm。该外推电离室具有在空腔内部测温,自动改变窗口上方材料厚度及采用微型计算机控制等特点。适用于测10 MeV能量以下,剂量率为10~5~10~(-3)Gy/h的电子或β射线吸收剂量。整个外推电离室自动测剂量系统在测~(204)TLβ放射源表面剂量率的不确定度为2.3%。测1.5 MeV电子束在硅和哈密瓜深部剂量率时,不确定度分别为4.0%和2.8%。 相似文献
6.
Ginés D. Guerrero José M. Cecilia Antonio Llanes José M. García Martyn Amos Manuel Ujaldón 《The Journal of supercomputing》2014,69(1):318-329
The rapidly growing field of nature-inspired computing concerns the development and application of algorithms and methods based on biological or physical principles. This approach is particularly compelling for practitioners in high-performance computing, as natural algorithms are often inherently parallel in nature (for example, they may be based on a “swarm”-like model that uses a population of agents to optimize a function). Coupled with rising interest in nature-based algorithms is the growth in heterogenous computing; systems that use more than one kind of processor. We are therefore interested in the performance characteristics of nature-inspired algorithms on a number of different platforms. To this end, we present a new OpenCL-based implementation of the Ant Colony Optimization algorithm, and use it as the basis of extensive experimental tests. We benchmark the algorithm against existing implementations, on a wide variety of hardware platforms, and offer extensive analysis. This work provides rigorous foundations for future investigations of Ant Colony Optimization on high-performance platforms. 相似文献
7.
发展了一套在线光纤式动态光散射粉体粒径测量系统,作为纳米颗粒制程粒径参数测量与分析.工业上对纳米粉体性质均一性(Uniformity)要求较高,为了获得在线制备纳米粉体颗粒的精确粒径大小与分布,本研究由激光动态光散射(Dynamic Light Scattering,DLS)原理,利用光纤探头方式,研制了一套在线粉体取样与粒径测量系统,针对目前台北科大自行研发的真空潜伏纳米流体制程(SANSS)进行了系统整合与测试.本研究针对100 nm标准粒径大小的聚苯乙烯(Polystyrene)粉体进行系统测量能力评估,确定了研发系统测量准确度(Accuracy)与重现性(Repeatability).实验结果显示,研发系统测量的平均粒径最大误差值在8%以下,初步确定测量系统可有效地监控纳米流体制程,提供纳米粉体制程的重要在线信息. 相似文献
8.
In ‘multi-adjoint logic programming’, MALP in brief, each fuzzy logic program is associated with its own ‘multi-adjoint lattice’ for modelling truth degrees beyond the simpler case of true and false, where a large set of fuzzy connectives can be defined. On this wide repertoire, it is crucial to connect each implication symbol with a proper conjunction thus conforming constructs of the form (←i, &i) called ‘adjoint pairs’, whose use directly affects both declarative and operational semantics of the MALP framework. In this work, we firstly show how the strong dependence of adjoint pairs can be largely weakened for an interesting ‘sub-class’ of MALP programs. Then, we reason in a similar way till conceiving a ‘super-class’ of fuzzy logic programs beyond MALP, which definitively drops out the need for using adjoint pairs, since the new semantics behaviour relies on much more relaxed lattices than multi-adjoint ones. 相似文献
9.
10.
针对红外温度传感器的测温精度易受环境温度的影响,提出了一种基于粒子群优化( PSO)GP ( PSO-GP)神经网络的温度补偿方法。所提出的PSO-GP算法解决了一般GP算法迭代速度慢、且易陷入局部最优的问题,以热电堆传感器的环境温度补偿为例,进行算法实现,并以单纯的GP算法做对照。仿真结果表明:提出的PSO-GP算法对环境温度有明显的补偿效果,且优于单纯的GP算法补偿。所构建的补偿模型具有较高的补偿精度和实用价值。 相似文献