巧用 Wo r d自带的绘图工具绘制物理电学矢量图形

从常用的 Wo r d, WP S软件中的绘制工具介绍入手, 以流程图、 曲线图、 自选图形和电路图等为例, 介绍 基础图形矢量图的实用绘制方法和技巧, 为物理教师进行图形绘制提供一种无需借助于其他软件就能自制矢量图 形的方法, 积累创建图形模板库的有效途径     

石英晶体振荡法监控膜厚研究

给出了石英晶体振荡法监控膜厚的基本原理,在相同的工艺条件下分别用光电极值法和石英晶体振荡法监控膜厚,对制备的增透膜的反射光谱曲线进行了比较,并对石英晶体振荡法的监控结果做了误差分析.结果表明:石英晶体振荡法不仅膜厚监控精度高,而且能监控沉积速率,获得稳定的膜层折射率,从而有效地控制薄膜的光学性能.     

Detection of Trace Heavy Metals Ions by Arrays of Titania Nanotubes Annealed in Nitrogen

Redox response of trace heavy metals ions(THMIs) has better performance on highly ordered vertically oriented titania nanotube arrays(TNA) annealed in nitrogen. Experimental data showed that different THMIs possess different reaction peak shapes and charge and discharge capacities. Therefore, the TNA will become an important tool used for environmental protection and facilitating the rapid determination of THMIs. THMIs of 5×10-4 mol/L concentration were measured at a scan rate of 100 mV/s. The analytical ut...     

Jounral of Partial Differential Equations

Aims and Scope： The Journal of Partial Differential Equations （JPDE） publishes high quality research papers and short communications in theory, applications and numerical analysis of partial differential equations. Papers addressing new theoretical techniques, novel ideas, and new analysis tools are suitable topics for the journal.     

Fast calculation of wave front amplitude propagation: a tool to analyze the 3D image on a hologram (Invited Paper)

A simple approach to calculate the amplitude component of a wave front propagating in space from a hologram is proposed. It is able to calculate the amplitude distribution on a plane at any distance rapidly using a standard GPU. This is useful for analyzing and reconstructing the 3D image encoded on a hologram.     

Preliminary study on CAD-based method of characteristics for neutron transport calculation

Our new method makes use of a CAD-based automatic modeling tool, MCAM, for geometry modeling and ray tracing of particle transport in method of characteristics （MOC）. It was found that it could considerably enhance the capability of MOC to deal with more complicated models for neutron transport calculation. In our study, the diamond-difference scheme was applied to MOC to reduce the spatial discretization errors of the fiat flux approximation. Based on MCAM and MOC, a new 2D MOC code was developed and integrated into the SuperMC system, which is a Super Multi-function Computational system for neutronics and radiation simulation. The numerical results demonstrated the feasibility and effectiveness of the new method for neutron transport calculation in MOC.     

NEURO FUZZY MODEL FOR PREDICTING THE DYNAMIC CHARACTERISTICS OF BEAMS

An adaptive neuro-fuzzy inference system （ANFIS） is introduced to predict the dynamic behavior of beams. The effects of axial forces and large displacements are considered in the analysis. A database of tests for the dynamic characteristics of beams is developed from the experimental tests. The responses of nonlinear vibration force for the single and multiple-stepped beams are calculated from the finite element method （FEM）, experimental tests and neuro-fuzzy model for comparison. The neuro-fuzzy model provides a general framework for the combination of neural networks and fuzzy logic. It is more flexible with more options of incorporating the fuzzy nature of the real-world system and is an useful estimation tool for the dynamic characteristics of beams. Therefore, ANFIS can be a useful tool for dynamic behaviour analysis of multiple-stepped beams subjected to axial loads and large displacement.     

Accelerating CFD–DEM simulation of processes with wide particle size distributions

Size-reduction systems have been extensively used in industry for many years. Nevertheless, reliable engineering tools to be used to predict the comminution of particles are scarce. Computational fluid dynamics(CFD)–discrete element model(DEM) numerical simulation may be used to predict such a complex phenomenon and therefore establish a proper design and optimization model for comminution systems.They may also be used to predict attrition in systems where particle attrition is significant. Therefore,empirical comminution functions(which are applicable for any attrition/comminution process), such as:strength distribution, selection, equivalence, breakage, and fatigue, have been integrated into the threedimensional CFD–DEM simulation tool. The main drawback of such a design tool is the long computational time required owing to the large number of particles and the minute time-step required to maintain a steady solution while simulating the flow of particulate materials with very fine particles.The present study developed several methods to accelerate CFD–DEM simulations: reducing the number of operations carried out at the single-particle level, constructing a DEM grid detached from the CFD grid enabling a no binary search, generating a sub-grid within the DEM grid to enable a no binary search for fine particles, and increasing the computational time-step and eliminating the finest particles in the simulation while still tracking their contribution to the process.The total speedup of the simulation process without the elimination of the finest particles was a factor of about 17. The elimination of the finest particles gave additional speedup of a factor of at least 18.Therefore, the simulation of a grinding process can run at least 300 times faster than the conventional method in which a standard no binary search is employed and the smallest particles are tracked.     

用向量解直线交点类问题的机械化方法

引言向量法解题平易简捷,但也有一定的技巧,且对几何图形有一定的依赖性.当遇到一个构图更复杂的几何问题时,用向量解题往往需要较大的耐心.如何根据向量法解几何题的基本思路和基本工具,把向量法发展成解几何题的机械化方法,     

城镇居民非参数消费敏感度模型及应用——基于局部线性工具变量估计方法

建立了城镇居民非参数消费敏感度模型,该模型不需做任何形式假设,避免了线性及非线性模型的误设.采用局部线性工具变量方法对其进行估计,结果表明城镇居民消费敏感度是时变的,和居民收入变动保持同步,支持流动性约束假说.另外高通货膨胀时的负实际利率变动比低利率、温和通胀时造成的负实际利率变动对消费支出的冲击要大得多.因此在增加城镇居民收入,突破流动性约束瓶颈的同时,高度关注通货膨胀,使得其消费水平得到真实提高.