浅论企业文化与可持续发展

第二次企业文化热潮已经初露端倪,越来越多的企业开始重视企业文化建设.企业文化到底是什么?为什么是企业竞争力的体现?怎样去建设企业文化?诸多问题困扰企业.本文从企业文化的本质说起,论述企业文化与企业竞争力和可持续发展的关系,并探讨企业文化和校园文化的建设.     

Metal Enrichment Processes

There are many processes that can transport gas from the galaxies to their environment and enrich the environment in this way with metals. These metal enrichment processes have a large influence on the evolution of both the galaxies and their environment. Various processes can contribute to the gas transfer: ram-pressure stripping, galactic winds, AGN outflows, galaxy-galaxy interactions and others. We review their observational evidence, corresponding simulations, their efficiencies, and their time scales as far as they are known to date. It seems that all processes can contribute to the enrichment. There is not a single process that always dominates the enrichment, because the efficiencies of the processes vary strongly with galaxy and environmental properties.     

软件公司新产品开发项目管理刍论

在分析当前软件公司新产品开发存在问题的基础上,将项目管理的理论方法运用到软件产品开发中,以便指导软件公司的新产品开发;将软件开发作为项目,按照项目管理的方法进行全过程的动态管理和控制,研究提高新产品开发的成功率.通过案例说明了在新产品开发中引入项目管理的可行性和科学性.     

Equilibration Processes in the Warm-Hot Intergalactic Medium

The Warm-Hot Intergalactic Medium (WHIM) is thought to contribute about 40–50% to the baryonic budget at the present evolution stage of the universe. The observed large scale structure is likely to be due to gravitational growth of density fluctuations in the post-inflation era. The evolving cosmic web is governed by non-linear gravitational growth of the initially weak density fluctuations in the dark energy dominated cosmology. Non-linear structure formation, accretion and merging processes, star forming and AGN activity produce gas shocks in the WHIM. Shock waves are converting a fraction of the gravitation power to thermal and non-thermal emission of baryonic/leptonic matter. They provide the most likely way to power the luminous matter in the WHIM. The plasma shocks in the WHIM are expected to be collisionless. Collisionless shocks produce a highly non-equilibrium state with anisotropic temperatures and a large differences in ion and electron temperatures. We discuss the ion and electron heating by the collisionless shocks and then review the plasma processes responsible for the Coulomb equilibration and collisional ionisation equilibrium of oxygen ions in the WHIM. MHD-turbulence produced by the strong collisionless shocks could provide a sizeable non-thermal contribution to the observed Doppler parameter of the UV line spectra of the WHIM.     

Thermodynamical Properties of the ICM from Hydrodynamical Simulations

Modern hydrodynamical simulations offer nowadays a powerful means to trace the evolution of the X-ray properties of the intra-cluster medium (ICM) during the cosmological history of the hierarchical build up of galaxy clusters. In this paper we review the current status of these simulations and how their predictions fare in reproducing the most recent X-ray observations of clusters. After briefly discussing the shortcomings of the self-similar model, based on assuming that gravity only drives the evolution of the ICM, we discuss how the processes of gas cooling and non-gravitational heating are expected to bring model predictions into better agreement with observational data. We then present results from the hydrodynamical simulations, performed by different groups, and how they compare with observational data. As terms of comparison, we use X-ray scaling relations between mass, luminosity, temperature and pressure, as well as the profiles of temperature and entropy. The results of this comparison can be summarised as follows: (a) simulations, which include gas cooling, star formation and supernova feedback, are generally successful in reproducing the X-ray properties of the ICM outside the core regions; (b) simulations generally fail in reproducing the observed “cool core” structure, in that they have serious difficulties in regulating overcooling, thereby producing steep negative central temperature profiles. This discrepancy calls for the need of introducing other physical processes, such as energy feedback from active galactic nuclei, which should compensate the radiative losses of the gas with high density, low entropy and short cooling time, which is observed to reside in the innermost regions of galaxy clusters.     

个性化定制企业门户桌面系统的设计与实现

提出了一种为用户提供个性化定制功能的企业门户桌面系统PD4EP(Personalized Desktop for Enterprise Portal).PD4EP划分了门户频道类别并对各类频道需提供的个性化功能进行了约束,实现了同类别的不同门户频道个性化定制方式的一致化,从而允许用户同时对多个门户频道批量个性化操作.采用了与企业门户具体业务和资源相分离的模块化系统结构,有效降低了门户桌面系统与其他组成单元间的耦合程度,提高了通用性;因此,PD4EP可用于新建企业门户桌面系统,还可以个性化功能插件的形式扩展现有企业门户桌面系统.PD4EP设计了基于控制反转思想的个性化功能操作流程,增强了门户桌面系统对不同开发者开发的门户频道的兼容性.      

Observations of Extended Radio Emission in Clusters

We review observations of extended regions of radio emission in clusters; these include diffuse emission in ‘relics’, and the large central regions commonly referred to as ‘halos’. The spectral observations, as well as Faraday rotation measurements of background and cluster radio sources, provide the main evidence for large-scale intracluster magnetic fields and significant densities of relativistic electrons. Implications from these observations on acceleration mechanisms of these electrons are reviewed, including turbulent and shock acceleration, and also the origin of some of the electrons in collisions of relativistic protons by ambient protons in the (thermal) gas. Improved knowledge of non-thermal phenomena in clusters requires more extensive and detailed radio measurements; we briefly review prospects for future observations.     

航空制造企业设备资产管理系统研究

航空制造企业生产设备价值高,专业性强,设备维护复杂,实施企业资产管理具有重要意义.针对航空制造企业设备资产管理现状,以提高设备利用率降低生产成本为首要目标,引入企业资产管理理念,提出了企业设备资产数字化管理框架,实施企业层面的设备生命周期全过程管理.以某大型航空制造企业为研究背景,开发了基于WEB的设备资产管理原型系统,初步实现了从设备采购、设备安装、设备维修以及设备报废处置全过程的数字化管理.     

基于CORBA的虚拟企业生产计划体系结构研究

虚拟企业 (Virtual enterprise)是随着现代市场竞争所产生的一种新型企业运作模式 ,它具有集成性和时效性两大特点。但是由于组成虚拟企业的盟友企业的管理水平不同、软硬件设备各异、地域分布广 ,因而虚拟企业的生产计划的控制难度高 ,能否对盟友企业之间生产计划进行高效准确的控制将影响虚拟企业的实施效果。文中运用 CORBA技术探讨了一种新型的分布式信息管理技术 ,并在此基础上提出了基于 CORBA的虚拟企业生产计划控制的基本体系结构和功能     

依托京津冀发展廊坊会展旅游业的对策研究

廊坊市处于京津冀会展旅游企业集群之中,它有很多发展会展旅游业的优势:北京会展旅游业的溢出效应优势、城市环境优势、经济优势、政策优势、成本优势;同时,廊坊在发展会展旅游方面也存在很多问题:目标市场定位不明确、品牌知名度低、旅游资源宣传、开发不足等问题。因此廊坊会展旅游应采取明确市场定位,实施集群化发展战略;发挥媒体整合传播功能,打造廊坊会展旅游品牌;挖掘集群内旅游资源,开发多样化旅游产品;开发会展主体,提高会展旅游人员素质等发展对策。