Efficient RC low-power bus encoding methods for crosstalk reduction

In on-chip buses, the RC crosstalk effect leads to serious problems, such as wire propagation delay and dynamic power dissipation. This paper presents two efficient bus-coding methods. The proposed methods simultaneously reduce more dynamic power dissipation and wire propagation delay than existing bus encoding methods. Our methods also reduce more total power consumption than other encoding methods. Simulation results show that the proposed method I reduces coupling activity by 26.7-38.2% and switching activity by 3.7%-7% on 8-bit to 32-bit data buses, respectively. The proposed method II reduces coupling activity by 27.5-39.1% and switching activity by 5.3-9% on 8-bit to 32-bit data buses, respectively. Both the proposed methods reduce dynamic power by 23.9-35.3% on 8-bit to 32-bit data buses and total propagation delay by up to 30.7-44.6% on 32-bit data buses, and eliminate the Type-4 coupling. Our methods also reduce total power consumption by 23.6-33.9%, 23.9-34.3%, and 24.1-34.6% on 8-bit to 32-bit data buses with the 0.18, 0.13, and 0.09 μm technologies, respectively.     

临近空间中核爆源区电磁脉冲与等离子体流场耦合

对临近空间中核爆源区电磁脉冲与飞行器等离子体流场的耦合进行了分析计算。对源区辐射场采用平面波近和源区感应场直接计入等离子体电导率的影响,推导出新的差分迭代公式计算。计算结果可供临近空间飞行器电磁兼容性研究参考。     

多模微波加热谐振腔的建模与仿真

基于有限积分算法设计软件CST建立4000mm×1600mm×920mm的微波谐振腔体模型,通过调整馈口位置、馈口数量、负载位置等,优化了腔体电场分布及馈源与腔体的耦合度,提高了微波加热效率。     

Coupled Response for Rigid Foundations

A matrix formulation to determine the coupled response of rigid foundations where soil properties are modeled by springs and dashpots is presented. Location and orientation of springs and dashpots can be arbitrary, thus a general solution is determined. The response is given in terms of translational and rotational displacements considering coupled effects. Physics of the problem presented here has been extensively studied and a broad range of useful formulae to determine springs and dashpots properties for soil-structure interaction is available. These published formulae for springs and dashpots properties are an input to the approach presented. Thus, the novelty of this approach is a matrix manipulation that leads to a simple expression allowing coupling all degrees of freedom even when springs and dashpots are not orthogonally oriented. For validation purposes, finite element solutions are compared with the approach presented.     

Monte Carlo有限元射线追迹法计算圆柱形闪烁体与光纤的耦合功率

本文建立了基于计算机模拟的蒙特卡罗有限元射线追迹法,应用该方法对不同结构尺寸的圆柱型LSO晶体和大芯径光纤耦合输出进行了模拟研究.模拟结果表明:闪烁体半径一定情况下,耦合功率增加的幅度随闪烁体厚度增加呈递减趋势,在闪烁体的厚度达到10 cm时增加闪烁体厚度,耦合功率增加趋于平缓;闪烁体厚度一定的情况下,在闪烁体的半径达到光纤立体角对应的半径后,继续增加半径,耦合功率增加幅度逐渐减少;在闪烁体的入射端面包95%的反射材料后,其耦合功率增加了90%.     

Random fuzzy variable foundation for Grey differential equation modeling

Grey differential equation (GDE) theory, which is a young branch of mathematical theory, deals with a system dynamic modeling having only a small size of system sampling information available for the investigation. Deng’s creation is very delicate and consequently forms one of the core parts of Grey system methodologies. However, what is the appropriate mathematical foundation for GDE modeling remains debatable. In this paper, we analyze the sources of error contributions and accordingly propose a random fuzzy variable foundation for GDE modeling based on the classical Gauss error law and the fuzzy credibility measure theory.     

径向弹性柱销联轴器的开发与研究

文章主要对径向弹性柱销联轴器的的主要性能、结构型式、参数确定、强度计算进行了探讨.得出了径向弹性柱销联轴器的选型、计算方法.结合试验台试验和工业试验,时上述研究进行了验证与修正.该方法对联轴器的选用具有一定参考作用.     

柴油发电机组联轴器叠片数量的确定

借用有限元软件,对柴油发电机组金属叠片联轴器设计难点一叠片数量的确定,通过用一个典型的实际设计案例,来进行较详细的分析和设计.为我国柴油发电机组这一电源设备生产行业,提供一种可探性强的、不再依赖模仿国外相类似产品的、设计金属叠片联轴器的理论方法.     

偶联剂对地砖用PVC填充材料相态结构和力学性能的影响

研究了钛酸酯类偶联剂和硅烷类偶联剂对钙矿、硅酸盐填充的PVC填允材料力学性能、相态结构、密度、热失重率及吸水伸长率和耐热阻燃性能的影响。结果表明,偶联剂可改善填充PVC的抗冲性能,降低其拉伸强度,扫描电镜分析表明,填料越细,分散越均匀,越易被PVC树脂所包覆,力学性能越好,研究得到了比重大、热失重率低、吸水伸长率小、阻燃耐烧灼性好的高填充PVC硬质塑料地板砖。     

气象水文模型耦合研究及其在渭河流域的应用

在由工程和非工程措施构成的流域防洪减灾体系中,水文预报占据十分重要的地位。为了延长水文预报的有效预见期,同时保证水文预报的精度,需要对整个水循环过程进行综合模拟研究,因此大气模式和水文模型的耦合研究成为关键。论文分别建立并验证了数值天气预报模式WRF和分布式水文模型WEP,采用单向耦合的方式,构建了渭河流域陆气耦合模拟平台,在此基础上对渭河流域2000年9月下旬至10月下旬的降雨和径流过程进行耦合模拟,并与实测降雨及径流日过程进行了对比分析,取得了较好的效果。