员工绩效考核体系中存在的问题分析——以M公司为例

绩效考核是人力资源管理中一个不可或缺的重要环节。作为一种反馈机制，它为企业创造了员工之间沟通和交流的机会。文章通过对M公司绩效考核体系运行现状的研究，运用多种方法来找出该考核体系不足之处，从而为设计出更为有效的绩效考核体系提供了一种思路。     

社区图书馆对促进廊坊文化繁荣的作用研究

社区图书馆是一种特殊类型的基层图书馆,它对廊坊市的文化事业繁荣起着重要作用。本文结合欧美国家社区图书馆的创办和管理经验,并结合廊坊的实际情况以及文化强国的策略,提出创办面向老人和青少年的特色社区图书馆,为市民打造一个科学文化知识普及和信息交流传播的平台,从而推动廊坊文化的繁荣与和谐。     

基于CompactPCI的多路遥测信号模拟源的设计与实现

对CompactPCI总线和其他主要的工业计算机总线进行了分析和比较,研究了基于CompactPCI总线的多路遥测信号模拟源的一些关键技术,并对多路遥测信号模拟源的底层软件接口进行了说明.基于CompactPCI总线平台的某卫星测控系统综合测试环境需要产生大量的传感器仿真信号作为遥测源,如果使用传统的采样保持电路和DA组合方式将难以在一个6U的CompactPCI板卡上实现多达128路的DA输出.围绕Analog Devices公司的8通道10?bits串行控制DA芯片AD5318,通过简单的接口电路直接实现与CompactPCI接口芯片连接,大大缩减了板卡上器件,成功的实现了128路的DA输出.同时,设计还在板卡上实现了一个以16?bits AD为核心的高精度反馈回路,以便对各通道的输出实现动态的监控和调整,保证了DA精度和验证遥测采集系统的性能.     

一种XML相似重复数据的清理方法研究

针对半结构化数据XML在数据清理中的重要性,研究了如何清理XML相似重复数据,主要工作有:提出一种有效的XML相似重复数据清理方法,该方法具有较强的适应性,任何XML相似检测算法都适用于此;给出一种基于树编辑距离的相似检测算法,该算法能有效地检测XML相似重复数据;采用树编辑距离的上下限优化基于树编辑距离的相似检测算法,避免了不必要的树编辑距离计算,降低了相似检测计算的复杂度,提高了运算效率.此工作为研究XML相似重复数据清理打下基础.      

双轴拉伸应力下后继屈服面的演化研究

屈服面的位置和形状直接影响着材料塑性应变的确定。针对双轴拉伸应力下金属材料的塑性行为,以一种弹塑性损伤本构理论为基础,研究了后继屈服面在拉-拉应力空间中的演化。考虑了有限变形效应和耦合硬化效应,给出了屈服面的确定方法,并预测了拉-拉应力空间中的初始屈服面(IYS)和后继屈服面,预测结果显示本文提出的理论模型能一致描述出后继屈服面演化中的前端尖点效应、尾部包氏效应、膨胀/收缩以及移动和畸变。针对两种加工硬化材料(Al 6061-T 6511和Annealed 1100 Al)承受轴向拉伸、环向内压、轴向-环向混合比例加载时的后继屈服面,将模型预测的结果与文献中的实验结果进行对比。结果表明,所提模型能较好地预测后继屈服面的演化,并能分析其物理机制,为后继屈服面的演化研究提供了一种可行的方法。     

柱塞组件收口技术及其改进

对现有柱塞组件的收口方法作了介绍并指出了各种收口方法的特点;介绍了某型产品收口的攻关过程;并提出了柱塞组件收口技术的改进以及高效收口机的设想。     

基于零点配置的分力合成主动振动抑制方法研究(英文)

The component synthesis active vibration suppression method （CSVS） can be applied to suppress the vibration of flexible systems. By this method, several same or similar time-varying components are arranged according to certain rules along the time axis. The synthesized command can suppress the arbitrary unwanted vibration harmonic while achieving the desired rigid body motion. The number of the components increases rapidly when the number of harmonic vibration is growing. In this article, the CSVS based on zero-placement technique is used to construct the synthesized command to suppress the multi-harmonics simultaneously in the discrete domain. The nature of zero-placement method is to put enough zeros to cancel system poles at necessary points. The designed synthesized command has equal time intervals between each component and which is much easier to be implemented. Using this method, the number of components increases linearly with the increasing of the number of being suppressed harmonics. For the spacecraft with flexible appendages, CSVS based on zero-placement is used to design the time optimal large angle maneuver control strategy. Simulations have verified the validity and superiority of the proposed approach.     

基于状态机的信息管理系统开发框架

为了使信息管理系统具有良好的最终可修改性、定制性和扩展性,提出一种利用XML描述用户界布局,运行时动态生成用户界面的信息管理系统开发框架.该框架引入了有限状态机进行流程控制,并以XML文件进行持久存储.即使在软件发布后,用户和开发人员仍能以较小代价对用户界面和流程控制进行修改,无需重新编译和链接,实现了表示层、业务逻辑层和控制层的分离.     

Exploring for natural gas using reflectance spectra of surface soils

Reflectance spectra in the visible and near-infrared wavelengths provide a rapid and inexpensive means for determining the mineralogy of samples and obtaining information on chemical composition. Hydrocarbon microseepage theory establishes a cause-and-effect relation between oil and gas reservoirs and some special surface anomalies, which mainly include surface hydrocarbon microseepage and related alterations. Therefore, we can explore for oil, gas by determining reflectance spectra of surface anomalies. This idea has been applied to the R&D project of exploring for natural gas in Qinghai province of China using NASA EO-1 satellite with the Hyperion sensor (June 2005 to June 2006). In this project, in order to improve the accuracy of exploration targets of natural gas mapped in the field studied, an integrated practical system of exploration of oil and gas was built by the analysis of not only hyperspectral remote sensing data but also data provided from field work. In this paper, our efforts were focused on the analysis of the 799 reflectance spectra provided from the field work. In order to properly define the typical form of hydrocarbon microseepage with spectroscopy and fulfill the data analysis, it was necessary to build a spectral model. In this spectral model the most important features of hydrocarbon microseepage in the surface of our study area, i.e., diagnostic spectral macroscopic features and diagnostic spectral absorption features, were proposed and extracted, respectively. The distribution of coexisting anomalies, which results from both alteration minerals and hydrocarbons, is estimated by the diagnostic macroscopic features mainly using Spectral Angle Mapper (SAM) classifier. On the other hand, the diagnostic absorption features of two main absorption bands presented abundant local information, based on deep analysis of which, we are able to map the anomalies of alteration minerals and hydrocarbons, respectively. Additionally, a general framework of analysis and key classification algorithms applied to the Hyperion data have been introduced briefly. In our work, three exploration targets of natural gas were identified from the study area which covers 2100 km². In the three exploration targets, three wildcats have been drilled by China National Petroleum Corporation (CNPC) since July 2006, and all the three wells have been proven some industrial reserves.     

某型涡扇发动机部件老化对性能影响的分析与计算

详细分析了部件老化对发动机性能影响的机理.利用所能得到的统计数据, 基于部件匹配技术, 通过将考虑部件老化影响的部件特性嵌入到发动机稳态性能计算模型中, 建立了考虑部件老化的发动机性能计算模型, 采用Newton-Raphson迭代收敛技术求解非线性方程组, 获得考虑部件老化影响的发动机性能.以某型涡扇发动机为例, 定量地计算分析了部件老化对发动机性能的影响, 计算结果和发动机实际试车数据对比具有较好的一致性, 表明本文发展的方法是合理的.