济南市部分农作物产品虚拟水含量的研究

基于虚拟水的理论,利用标准彭曼公式和Cropwat软件,对济南市2008年的部分农作物产品虚拟水含量进行了计算分析。结果表明:小麦的虚拟水净进口量为-77477.9×103m3,属于虚拟水出口型作物,稻谷、棉花、豆类和花生果的虚拟水净进口量都是正值,属于虚拟水进口型作物。但总的来说,虚拟水的出口大于进口,这直接危及到济南市的水资源安全。针对这一现状,提出了通过虚拟水贸易和调整农作物种植结构的途径来实现济南市水资源的安全和可持续利用发展。     

基于Spring的Web框架的设计及其应用

J2EE体系的核心规范EJB对于许多中小企业的Web应用显得过于厚重,急需引入一种轻量级的Web应用框架,降低系统的实现难度和开发成本。以Spring为核心,集成Hibernate、Acegi等开源框架技术构建基于J2EE的Web应用框架,采用分层的思想,实现权限管理、信息管理等基本功能,为Web开发者提供一个轻量级的、可复用的、可扩展的框架。基于该框架实现威海市大型科学仪器共享平台的设计开发,以此说明该Web应用框架的高效性、灵活性和可复用性。     

基于Struts、Spring和Hibernate的船舶性能系统的设计与实现

详细阐述了自行开发的船舶性能预报系统的设计与实现,简述了在开发过程中使用的技术和框架:集成Struts、Spring、Hibemate技术构建的J2EE快速开发框架,说明通过结合已有的Struts、Spring和Hibernate架构,能使得项目开发过程简洁、结构清晰,并使系统具备很好的可扩展性和可维护性,提高了J2EE项目的可重用性.     

时间序列季节调整方法在中国的发展:PBC版X-12-ARIMA

中国人民银行(PBc)版X-12-ARIMA软件是基于中国特点而定制的时间序列季节调整软件.通过总结时间序列季节调整方法的特点以及相应软件在国外的发展,针对我国应用的特点,尤其是春节因素的考虑,在解剖X-12-ARIMA方法原理的基础上,在春节因素计算方法、软件应用界面以及用户使用帮助等3个主要方面加以改进,具有数据导入、调整设置文件、运行方式以及结果输出4方面的特色.     

基于PLC的铁路枕簧智能分选系统的开发

该系统采用了当今先进的集成控制——主从分布式控制系统,由欧姆龙公司的PLC完成对枕簧自动检测、分检系统的控制。本文介绍了枕簧检测、喷漆、烘干、分拣控制系统的组成、工作原理、控制方式及程序设计思想。实际应用证明:该系统提高了检测精度、降低劳动强度,保证了列车安全运行。     

基于开源框架的多层架构研究与应用

对开源框架Struts、Spring和Hibernate的功能和优点进行分析,得出一套合理的Struts、Spring、Hibernate整合方案,利用它们的优点构建出低耦合的多层软件架构,并结合实际项目介绍该架构的应用。     

高压开关用弹簧操动机构关键部件失效分析

本文通过对弹簧操动机构原理及关键材料物性分析介绍,阐述了操动机构关键部件材料应力仿真分析和凸轮失效分析,给出了弹簧操动机构的设计优化建议,为研究弹簧操动机构失效机理演变及失效规律提供工程应用和指导,具有重要的现实意义。     

Parallel Cloth Simulation Using OpenGL Shading Language

The primary goal of cloth simulation is to express object behavior in a realistic manner and achieve real-time performance by following the fundamental concept of physic. In general, the mass–spring system is applied to real-time cloth simulation with three types of springs. However, hard spring cloth simulation using the mass–spring system requires a small integration time-step in order to use a large stiffness coefficient. Furthermore, to obtain stable behavior, constraint enforcement is used instead of maintenance of the force of each spring. Constraint force computation involves a large sparse linear solving operation. Due to the large computation, we implement a cloth simulation using adaptive constraint activation and deactivation techniques that involve the mass–spring system and constraint enforcement method to prevent excessive elongation of cloth. At the same time, when the length of the spring is stretched or compressed over a defined threshold, adaptive constraint activation and deactivation method deactivates the spring and generate the implicit constraint. Traditional method that uses a serial process of the Central Processing Unit (CPU) to solve the system in every frame cannot handle the complex structure of clothmodel in real-time. Our simulation utilizes the Graphic Processing Unit (GPU) parallel processing with compute shader in OpenGL Shading Language (GLSL) to solve the system effectively. In this paper, we design and implement parallel method for cloth simulation, and experiment on the performance and behavior comparison of the mass–spring system, constraint enforcement, and adaptive constraint activation and deactivation techniques the using GPU-based parallel method.     

碟簧桩帽几个重要参数的确定方法

介绍了碟簧桩帽的恢复系数的试验测定,结合优化计算,介绍了打桩参数选择的方法．     

Polymer solutions confined in slit-like pores with attractive walls: An off-lattice Monte Carlo study of static properties and chain dynamics

Summary Using a bead spring model of flexible polymer chains, the density profiles and chain configurational properties of polymer solutions confined between parallel plates were studied. A wide range of density , chain length N, and strength of a short-range attractive wall potential was investigated. Both a temperature T in the good solvent regime (T > , being the Theta temperature where a chain in unconfined bulk three-dimensional solution would behave ideally) and a temperature in the bad solvent regime (T < ) were considered. It is shown that phase separation in a polymer-rich and polymer-poor solution in the slit competes with polymer adsorption at the walls. A qualitative connection to the wetting behavior of semi-infinite polymer solutions is drawn. The acceptance rate for monomer motions was studied for various conditions, and profiles of monomer mobility across the slit were recorded. Also, average chain relaxation times were extracted from the time dependence of mean-square displacements. Although with increasing density the chain radii (at T > ) show a crossover from two-dimensional excluded volume behavior (R_g N² with = 3/4) to ideal random walk behavior ( = 1/2), the relaxation times show effective exponents Z_eff ( N^{Z eff}) that clearly deviate from the Rouse prediction in concentrated confined solutions.