任意截面柱形谐振腔特性分析的FDTD法研究

本文研究了如何分析与计算任意截面柱形谐振腔式微波加热器的特性参数．采用多面体网格近似与曲面共形技术相结合的ＦＤＴＤ方法，模拟任意截面柱形腔体，计算其特性参数，与传统的阶梯近似相比，数值计算精度有较大提高     

电工实验测评系统的研究与应用

高效、便捷的实验考核系统是高校教学管理水平的重要体现。文章介绍了电工实验测评系统的开发全过程,分析了系统的需求,给出了系统的用例图;结合系统的需求,确定了系统的功能模块,解决了模块结构的设计、试卷分配,试卷生成,数据加密等问题,通过应用取得了较好的效果。     

青山嘴水库一期基础工程强夯效果分析

以青山嘴水库一期基础工程为具体实例,研究了强夯处理在增加重型动力贯入10 cm最小击数、提高地基承载力、增加干密度以及降低含水率等方面的效果.通过对试验测定的相关数据分析表明:强夯能使重型动力触探贯入10 cm最小锤击数增加417.46%～600%,地基承载力提高119.44%～163.98%,土体干密度增加7.18%～8.23%,土体含水率下降4.93%～45.14%,说明强夯效果非常显著.     

Early Warning with Calibrated and Sharper Probabilistic Forecasts

Given a nonlinear model, a probabilistic forecast may be obtained by Monte Carlo simulations. At a given forecast horizon, Monte Carlo simulations yield sets of discrete forecasts, which can be converted to density forecasts. The resulting density forecasts will inevitably be downgraded by model misspecification. In order to enhance the quality of the density forecasts, one can mix them with the unconditional density. This paper examines the value of combining conditional density forecasts with the unconditional density. The findings have positive implications for issuing early warnings in different disciplines including economics and meteorology, but UK inflation forecasts are considered as an example. Copyright © 2012 John Wiley & Sons, Ltd.     

颗粒组成对硅砖制品出现烧成裂纹的影响

降低临界粒度是解决硅砖制品在烧成中产生裂纹的重要途径之一，当将临界粒度控制在２５ ｍ ｍ 时，制品中基本没有裂纹产生，如果合理地选择粒度系数和矿化剂加入量，就会得到具有较高性能指标的硅砖制品。     

影响铸造涂料工艺性能的因素分析

通过正交实验研究，测试了铸造涂料的碾压工艺、原材料以及原材料的处理工艺对涂料的悬浮性、表面强度、发气量等主要工艺性能的影响。结果表明：当选用轮碾机制作铸造涂料时，碾压时间达到１．５小时即可满足工艺性能的要求；涂料中无论是粘结剂还是悬浮剂的增加均会大幅度提高涂料的表面强度和悬浮性。     

NiB,Ni_2B,Ni_3B原子簇结构及成键特性的DFT研究

用ＤＦＴ方法对ＮｉＢ，Ｎｉ２Ｂ，Ｎｉ３Ｂ二重态和四重态两种多重度的各种可能构型进行高水平的量子化学计算，结果发现Ｎｉ，Ｂ原子所带电荷的正负与原子簇的组成和结构有关，存在较强Ｎｉ，Ｂ的相互作用，Ｎｉ－Ｂ键对ＮｉＢ，Ｎｉ２Ｂ，Ｎｉ３Ｂ分子的稳定性有很大贡献     

Dynamical symmetric group approach to potential energy surface of molecule O3

Hamiltonian of an O₃ molecule is classicized by using coherent states, and its potential energy surface is obtained. The surface and the contours are plotted. The calculated force constants and dissociation energies are in good agreement with experimental values.     

The EM scattering from one-dimensionally lossy fractal surfaces

The EM scattering from rough surface has been investigated in the past years. Periodic and random models are often used in modeling the rough surface. Recently, the fractal geometry is rapidly improved. It provides a new way to model the rough surface whose characteristics are long-range order and short-range disorder. In this paper, A fractal function is used to model the rough surface. A scattering coefficient for calculating the angular distribution and the amount of energy in the spectrally scattering field to the fractal characteristics of the surfaces by finding their analytical expressions is derived by using the Kirchhoff solution. In the end, we calculate some scattering patterns. Supported by the National Natural Science Foundation of China Gao Huotao: born in 1964, Graduate student     

环扇形薄板挠度计算的加权残值法

应用加权残值法研究了环扇形薄板的弯曲问题，通过计算实例表明，该方法简单易行，精度高。