管拱面内两点非对称加载试验研究

对钢管混凝土拱和钢管-钢管混凝土复合拱进行面内两点非对称加载试验。建立了双重非线性有限元计算模型,对模型拱的挠度、钢管应变、材料非线性与几何非线性影响、管内混凝土对极限承载力的影响进行了分析。分析结果表明,管内混凝土提高拱的极限承载力的能力与拱的加载工况有关,当拱以受弯为主时,这种提高作用较小,当拱以受压为主时,这种提高作用较大;在受力全过程中,材料非线性的影响是主要的,几何非线性的影响是次要的,但由于存在耦合作用,分析时应考虑双重非线性的影响;对于复合拱,拱肋在变刚度靠空钢管一侧的受力情况较为复杂与不利。     

住宅室内环境污染及其防治措施

通过分析室内环境污染物的来源,论述室内环境污染对人体健康的危害性,并从建筑材料、国家法规等方面提出防治室内环境污染的措施。     

稠密气固两相流的流场实验显示和粒化温度模型

在水平激波管中,研究激波与堆积粉尘的相互作用,并通过带示踪粒子的X射线和阴影摄影,记录堆积粉尘内外流场的波系结构.引入“粒化温度”,基于稠密气体分子动力学的思路导出堆积粉尘的守恒方程和本构方程,利用AUSM+格式对激波与堆积粉尘相互作用现象进行了数值模拟.计算结果与实验结果基本相符.     

一种实用的静态电压稳定判据

本文给出一种静态电压稳定性分析的新方法。首先,推导出实用的静态电压稳定判据,并能够直接求出静态坟稳定临界值。其次,定义了新的静态电压稳定裕度参量及确定电压稳定临界域。实例表明该方法具有实用、简捷的特点。     

一种基于实例的故障混合诊断方法

首先提出了一种基于实例的混合推理总体结构。在一级实例库和二级实例库概念的基础上,定义了实例的结构及组织。并设计了三级推理机制,即以故障代码为匹配目标、一级实例库为匹配空间进行的一级实例推理,以模糊化的初始故障征兆为匹配目标的二级实例推理。最后给出了故障征兆模糊处理以及实例匹配的方法。     

Two-dimensional MXene hollow fiber membrane for divalent ions exclusion from water

Two-dimensional material membranes with fast transport channels and versatile chemical functionality are promising for molecular separation.Herein,for the first time,we reported design and engineering of two-dimensional Ti3C2Tx MXene (called transition metal carbides and nitrides) membranes supported on asymmetric polymeric hollow fiber substrate for water desalination.The membrane morphology,physic-ochemical properties and ions exclusion performance were systematically investigated.The results demonstrated that surface hydrophilicity and electrostatic repulsion and size sieving effect of interlayer channels synergistically endowed the MXene hollow fiber membrane with fast water permeation and efficient rejection of divalent ions during nanofiltration process.     

圆钢管约束超高性能混凝土短柱轴压受力性能研究

为研究钢管约束超高性能混凝土（UHPC）短柱的套箍效应和轴压承载力,进行了12根钢管约束超高性能混凝土短柱的轴压试验,分析其破坏模式、变形及受力全过程。试验结果表明：钢管约束超高性能混凝土轴压短柱破坏模式与套箍系数相关,随着套箍系数的增大,轴压短柱分别出现剪切破坏、混合破坏和腰鼓破坏;套箍系数较小（0.43~0.52）的短柱,其破坏全过程中弹塑性段较短,表现出较明显的脆性破坏,当套箍系数较大（1.21~1.80）时,短柱破坏时的塑性明显增强。基于试验验证的有限元模型,参数分析表明,钢管套箍效应产生的承载力提高系数介于1.2~1.4之间;在0.43≤ξ≤1.08范围内,承载力提高系数随套箍系数增大而增大,建议径厚比的取值范围为12.0~23.0。通过对现有钢管约束混凝土承载力计算方法分析,提出了钢管约束超高性能混凝土轴压短柱承载力计算方法,其计算结果与试验结果吻合良好。     

银电解精炼中铋的行为分析

从理论和实践的角度分析论述了银电解精炼过程中杂质铋的行为，提出了银电解过程中对杂质铋的控制措施，介绍了在生产中应用效果。     

An integrated runtime QoS-aware middleware framework for distributed multimedia applications

Future-generation distributed multimedia applications are expected to be highly scalable to a wide variety of heterogeneous devices, and highly adaptive across wide-area distributed environments. This demands multiple stages of run-time support in QoS-aware middleware architectures, particularly, probing the performance of QoS parameters, instantiating the initial component configurations, and adapting to on-the-fly variations. However, few of the past experiences in related work have shown comprehensive run-time support in all of the above stages – they often design and build a middleware framework by focusing on only one of the run-time issues. In this paper, we argue that distributed multimedia applications need effective run-time middleware support in all these stages to be highly scalable and adaptive across a wide variety of execution environments. Nevertheless, the design of such a middleware framework should be kept as streamlined and simple as possible, leading to a novel and integrated run-time middleware platform to unify the probing, instantiation and adaptation stages. In addition, for each stage, the framework should enable the interaction of peer middleware components across host boundaries, so that the corresponding middleware function can be performed in a coordinated and coherent fashion. We present the design of such an integrated architecture, with a case study to illustrate how it is simple yet effective to monitor and configure complex multimedia applications.     

关键绩效指标法在石油销售企业绩效管理中的应用

绩效考核是人力资源管理的晕点和难点。石油销售企业经历着从传统的国有企业向现代化商业组织的转型,如何有效实施绩效考核,是企业管理者面临的一个重大课题。文章对石油销售企业关键绩效指标（Key Performance Indicator,简称KPI）的设计背景和目标进行分析,介绍了石油销售企业KPI体系,探讨KPI项目实施过程中的问题,提出了实施KPI项目的主要途径,对改进石油销售企业绩效管理具有现实意义。