电站立式给水加热器传热强化及无铜化运行研究

针对电站立式给水加热器的传热特性和强度要求,研制并加工出小螺旋角内外螺旋翅片管（IOSF管）来强化其传热特性,基础试验表明,IOSF管的总传热系数比光滑管提高63%-95%;工业试验表明,采用IOSF管的立式高压加热器总换热系数提高43%,对钢螺旋槽管替代铜光滑管进行了实验研究,结果表明,钢质螺旋槽管给水加热器不仅能保证原有热负荷,还能提高其换热强度,实现了锅炉给水无钢化运行的要求。     

离心流化床中多孔介质干燥的传热传质研究

通过对典型的多孔湿物料在离心流化床中干燥过程的理论分析,将含湿多孔介质传热传质过程和物料与气流之间的外部传递过程相耦合,导出了离心流化床的控制方程组,在此基础上,可以对离心流化床中湿物料的干燥过程进行数值模拟。     

整体性思维方式与中国古代文学审美特质

中国人对宇宙、生命的整体性思维方式,集中而典型地体现于意境的实践和理论中,意境完美地解决了整体性主观外化的难题,它是荣格所谓的同步原理最生动的体现,是将主、客观内容一体化的审美图式,因其具有最丰厚的审美信息而成为一种超级审美负荷体,这表明人类智能发展在审美领域里完全由量的精度向质的活性飞跃。     

应用分子结构信息计算气态烷烃的燃烧热

根据分子结构的特点 ,发展了一种根据分子结构信息预测气态烷烃燃烧热的新方法—基团键贡献法。该方法将基团贡献法和化学键贡献法有机地结合在一起 ,既考虑分子中基团的特性 ,又考虑基团之间的连接性 (化学键 ) ,同时具有基团贡献法和化学键贡献法的特点。对 30 6种气态烷烃燃烧热的计算结果表明 ,计算值十分接近实验值 ,平均误差0 0 45 %。     

基于功率约束及节点频谱选择的认知协同路由

为了提升认知无线网络的数据传输效率,优化节点能量负载,提出一种协同路由算法。基于覆盖与底层技术的协作设计一种协同网络架构,该架构针对网络频带表现多样化提供了一种新的频谱选择策略,提升频谱资源效用。结合协同网络频谱选择时的干扰特性,根据频谱、干扰和功率约束关系,提出最大化链路容量的频谱及节点功率分配方法。在协同路由设计上引入了频谱效用参数,参数的度量标准涉及节点剩余能量和链路容量,以优化路由节点能量负载和传输效率为目的。仿真对比结果表明,算法有效地利用信道接入机会进行数据转发,提高了传输效率,相比基于竞争进化算法的多播路由方法,数据包传递成功率提升了1．4％,平均网络吞吐量高出8．4％,平均节点剩余能量高出3．2％,在均衡节点负载上性能良好。     

受热面温度与磨损量关系的试验研究

本文在对燃煤电站锅炉对流受热面受飞灰磨损进行理论分析的基础上，建立了热态下飞灰冲蚀受热面磨损特性的数学模型，并通过试验研究求出在不同粒子冲刷速度下，质量相对磨损量与受热面温度变化之间的函数关系式．     

The psychosocial work environment of district nurses in Sweden

Data were collected from a stratified sample of district nurses in the greater Stockholm area on four occasions during one year using questionnaire techniques (to assess psychosocial working conditions and social networks, and self-reported health sums); as well as physiological measurement techniques. Three groups of district nurses were compared: group A, those working independently in the 'traditional' role but outside primary health care centres; group B, those working independently in the 'traditional' role but in primary health care centres; and group C, those working in the model role as part of primary health care teams. The study focused on the effects of these different work environments on the district nurse's psychological and somatic health, and their physiological state.

The data suggested that district nurses in the primary care teams (group C) had a lower objective work load than those working in the more traditional role. Despite this, they reported a less favourable balance (ratio) of work demands to decision latitude. They reported more 'problems' and 'conflicts' at work than did the other district nurses. However, such 'problems' were diminishing during the study period, which could mean that successive adaptation to the 'new' situation was occurring. The 'conflicts', on the other hand, remained. This may indicate that despite this adaptation, the district nurses in the primary care teams were struggling with their new work roles. It points to the need for organizational support during this important change process. The district nurses in group B (traditional role but in a primary health care centre) had the highest objective work load and showed physiological reactions in terms of elevated plasma cortisol levels in the morning, high systolic blood pressure and sleep disturbances.     

结构荷载效应的分布概型及其数字特征

以结构网络分析法为基础,导出了结构荷载效应特征函教算式.由此,可确定结构荷载效应的分布概型及其数字特征.     

侧壁射流对突扩通道流动特性的影响

讨论了垂直于突扩通道主流方向的侧壁射流对壁面压力系数、传热系数及主回流区长度的影响．采用标准κ-ε双方程湍流模型，对侧壁射流突扩通道中的流场进行了数值模拟，计算结果表明，侧壁射流位置越靠近入口，主回流区长度越短，最大压力系数位置前移，其数值增大，局部表面传热系数也增大．根据计算结果，拟合出了当侧壁射流速度与突扩通道入口平均流速之比等于2．0时，主回流区长度与侧壁射流位置的关系式。     

绵阳城市气候初探

本文采用城乡对比法和历史对比法,研究了绵阳城市气候的特点,结果是:绵阳高于30℃的最高气温的年平均天数比邻近县多11天;高于35℃的最高气温年平均天数也比邻近县多10—11天,绵阳的相对湿度比邻近县小1%;水汽压比三台县小0.6hPa,比江油县小0.1hPa;历史对比,绵阳水汽压有减小的趋势;日照时数近20年减少了24%;雾日已达87.3天(重庆为100.9天)。本文初步探讨了绵阳城市气候变化的原因。