三电一体化网络的设计

三电一体化网络在企业的发展中起着重要作用,它把仪表控制、电气控制和计算机网络有机地结合在一起,对企业的自动化控制和科学化管理起着不可忽视的作用。天津第三煤气厂正是采用了三电一体化网络的设计思想。     

浅析核电企业的安全文化

国际原子能机构在对切尔诺贝利事故分析中提出了安全文化的概念。安全文化得到了全世界核电企业的广泛认同和实践。目前,安全文化已是核电企业文化的核心,被称为核电企业的灵魂,成为核安全的重要保障。本文剖析了安全文化的三个层次,介绍了安全文化发展的三个阶段。     

慢性乙型病毒性肝炎患者疾病相关知识及影响因素研究

目的了解CHB患者对自身疾病的认知,分析认知方面存在的问题和影响因素,为健康教育和护理干预提供依据。方法对120例住院CHB患者进行问卷调查与分析。结果患者的疾病相关知识总体标准化得分7．26±1．57,其中戒酒、家人防护、诱发因素得分较高,分别为8．92±2．48、8．33±3．74、8．18±2．03;疾病预后、传染性得分较低,分别为4．42±3．09和4．94±3．18。影响疾病相关知识的因素为文化程度和既往是否住院。结论应进一步重视文化程度较低和院外患者的健康教育。     

Effect of particle shape on domino wave propagation: a perspective from 3D,anisotropic discrete element simulations

A fundamental understanding of the underlying physics of granular systems is not only of academic interest, but is also relevant for industrial applications. One specific aspect that is currently only poorly understood is the effect of particle shape on the dynamics of such systems. In this work the effect of particle shape on domino wave propagation was studied using 3D, anisotropic discrete element simulations. The dominoes were modelled using the three-dimensional super-quadric equation and very good agreement between the intrinsic collision speeds predicted by the simulations and the corresponding experimental data was observed. Furthermore, the influence of particle blockiness on the collision dynamics of dominoes was investigated numerically using particle shapes ranging from ellipsoids to almost cuboid particles. It was found that the intrinsic collision speed increased with increasing particle blockiness. It was also shown that a higher initial contact point favours the transmission of kinetic energy in the direction of the wave propagation, leading to a higher intrinsic collision speed for dominoes of higher blockiness.     

原子吸收分光光度法测定铁矿中氧化钙、氧化镁

提出了一个用火焰原子吸收分光光度法测定铁矿中氧化钙、氧化镁的方法。研究讨论了酸度、干扰离子、工作条件等因素的影响。分析中。以HNO3—HF—HCLO4混合酸分解样品。以SrCL2作为钙、镁的释放剂，用工作曲线法测定。方法简便、快速、准确。应用于铁矿样品的测定，结果令人满意。     

The presence of ammonium facilitates nitrite reduction under PHB driven simultaneous nitrification and denitrification.

For economic and efficient nitrogen removal from wastewater treatment plants via simultaneous nitrification and denitrification the nitrification process should stop at the level of nitrite such that nitrite rather than nitrate becomes the substrate for denitrification. This study aims to contribute to the understanding of the conditions that are necessary to improve nitrite reduction over nitrite oxidation. Laboratory sequencing batch reactors (SBRs) were operated with synthetic wastewater containing acetate as COD and ammonium as the nitrogen source. Computer controlled operation of the reactors allowed reproducible simultaneous nitrification and denitrification (SND). The oxygen supply was kept precisely at a low level of 0.5 mgL(-1) and bacterial PHB was the only electron donor available for denitrification. During SND little nitrite or nitrate accumulated (< 20% total N), indicating that the reducing processes were almost as fast as the production of nitrite and nitrate from nitrification. Nitrite spiking tests were performed to investigate the fate of nitrite under different oxidation (0.1-1.5 mgL(-1) of dissolved oxygen) and reduction conditions. High levels of reducing power were provided by allowing the cells to build up to 2.5 mM of PHB. Nitrite added was preferentially oxidised to nitrate rather than reduced even when dissolved oxygen was low and reducing power (PHB) was excessively high. However, the presence of ammonium enabled significant reduction of nitrite under low oxygen conditions. This is consistent with previous observations in SBR where aerobic nitrite and nitrate reduction occurred only as long as ammonium was present. As soon as ammonium was depleted, the rate of denitrification decreased significantly. The significance of the observed strongly stimulating effect of ammonium on nitrite reduction under SND conditions is discussed and potential consequences for SBR operation are suggested.     

多升力弹体气动伺服弹性发散分析

本文将无控二升力弹体气动弹性发散分析方法推广为有控多升力弹体气动伺服弹性发散分析方法。该方法毋需结构固有振型为原始数据,且数学工具简单。     

CRIMM法生产人造金红石

CRIMM法是盐酸法,它能用不同蚀变程度的钛铁矿生产保持原矿粒度的人造金红石。该法采用流态化床浸出器,多段逆流常压浸出,总的浸出时间为9—12小时。CRIMM法经历了小型、中间试验和工业试验等各个发展阶段,其结果相互验证。现正计划建设万吨级工业生产厂。     

某管廊基础方案选型及经济分析

介绍了某管廊基础方案选型及经济分析。综合分析了混凝土灌注桩、微型钢管桩、预应力管桩、钢管桩以及H型钢五种桩型,兼顾承载力要求、工期、经济及外观要求等因素,确定采用管桩基础。     

捕鲸叉导弹环境试验鉴定研究(续)

阐述了捕鲸叉导弹试验环境设计的目标、任务和标准,分析了空基、舰基和潜基平台环境和自然环境对导弹的脆弱易损部件的影响数据,最后给出简要结论。