金纳米线拉伸行为的分子动力学模拟

采用分子动力学方法模拟了不同截面尺寸金纳米线的拉伸力学行为。计算结果表明:相同长度的金纳米线弹性模量随着截面尺寸的减小而减小,而其屈服强度随着截面尺寸的减小而增大,并且发生屈服推迟现象。应力—应变曲线与形变过程相对应。在弹性变形阶段,纳米线形变不显著;随着应变量的增加,发现纳米线出现大量堆垛层错。     

声频谱测井仪器的研制和野外实验

研制成功的声频谱测井仪器在井下发射和接收三种频率的声波信号,其中发射和接收20kHz声波信号的声系有一个发射和四个接收探头,源距为2．1～2．568m,间距为0．156m;发射和接收40kHz声波信号的声系由一个发射和两个接收探头组成,源距1．0—1．5m,间距0．5m;发射和接收10kHz声波信号的声系由一个发射和两个接收探头组成,源距为2．168—2．668m,间距0．5m．用三种不同的频率的声波进行测量记录目的是获得井壁径向深度不同处介质的声学信息,而且不同频率的声波信号在岩石中传播过程中频谱变化也是井壁岩层的可用声学信息．在井下的信息采集、数据传输、地面记录和监控全部由计算机控制．该仪器已经在大庆油田的三口井中成功的进行了野外实验．     

临川区土地生态环境安全评价研究

通过对临川区土地生态环境的研究,采用德尔菲法、等距划分法、加权指数法,确定该区域生态环境评价指标、权重、以及安全等级,得出临川区各乡镇的生态环境安全指数,为临川区土地生态环境安全建设提出建议。     

光催化-Fenton工艺处理废纸制浆废水

为有效处理废纸制浆废水,采用氙灯照射下的光催化-Fenton技术,研究不同反应器、曝气、草酸钾、H2O2投加方式和废水质量浓度对光-Fenton工艺去除废水中TOC或吸光度的影响.结果表明,提高光照强度可提高TOC去除率;添加适量的草酸钾可提高处理效果;H2O2分两次投加可取得较好的处理效果,大大减少对催化剂的需求;在处理过程中使废水暴露于空气可提高有机物的脱氯效果,但曝气对处理效果并无益处.对于TOC为185 mg/L左右的废纸制浆废水,在[H2O2]=1000 mg/L、[Fe(Ⅱ)]=100 mg/L、pH=3.0、温度为30℃的条件下,经过30 min处理,废水的TOC可去除63%以上.     

城市污水的层流换热特性理论

为有效利用城市污水热能,以污水源热泵系统中的流动工质——城市污水为研究对象,通过理论分析的方法,对其层流状态下的换热特性进行理论推导和实验验证.结果表明:污水作为热泵的冷热源,有良好的换热特性,推导得出的换热准则关联式h=4.53λ/D,为污水源热泵系统设计提供依据,同时为应用污水余热技术提供理论基础.     

Effect of puerarin on the P13K pathway for glucose transportation and insulin signal transduction in adipocytes

To explore the effect of puerarin on insulin receptor (IR), insulin receptor substrate-1 (IRS-1) and protein expression of protein kinase B(PKB) in the P13K pathway of the glucose consumption, transportation and insulin signal transduction in 3T3-L1 adipocytes with insulin resistance. The insulin resistance 3T3-L1 adipocytes model was established by free fatty acid induction. The model cells were managed with puerarin in different concentrations. Glucose consumption was detected with glucose oxidase method, glucose transportation rate was determined by 2-deoxy-3H glucose ingesting method, and the IR, IRS-1 and PKB expression were determined by Western blot. Glucose consumption and transportation were significantly decreased in the model adipocytes, but increased after treated with puerarin (P<0.01). Moreover, the level of tyrosine phosphorylation of IR subunit β was higher in the puerarin treated groups, and that of IRS-1 was higher in the group treated with low dose puerarin than that in the model group. The 3T3-L1 adipocytes of insulin resistance model could be induced by free fatty acid successfully, puerarin could promote the glucose utilization in them to alleviate the insulin resistance, which may be related with the action in advancing the tyrosine phosphorylation of IR and IRS-1.     

Damage and deterioration mechanism and curing technique of concrete structure in main coal cleaning plants

Concrete structures in main coal cleaning plants have been rebuilt and reinforced in the coal mines of the Shanghai Da-tun Energy Sources Co. Ltd., the first colliery of the Pingdingshan Coal Co. Ltd. and the Sanhejian mine of the Xuzhou Mining Group Co. Ltd. In these projects, the operating environment and reliability of concrete structures in the main plants of the three companies were investigated and the safety of the structures inspected. Qualitative and quantitative analyses were made on the spe-cial natural, technological and mechanical environments around the structures. On the basis of these analyses, we discuss the long-term, combined actions of the harsh natural (corrosive gases, liquids and solids) and mechanical environments on concrete structures and further investigated the damage and deteriorating mechanisms and curing techniques of concrete structures in the main coal cleaning plants. Our study can provide a theoretical basis for ensuring the reliability of concrete structures in main coal cleaning plants.     

营运资金安全性与管理效率评价

基于风险收益权衡原则,构建了营运资金评价体系,特别指出营运资金评价应包括安全性与管理绩效性两个方面,并重点对此进行了研究,从中提出了一些改进营运资金财务分析的看法与建议,以期为企业改进营运资金管理掌控营运资金循环、为更好服务于保护债权人利益和所有者利益目标提供实现途径.     

高等院校开展学生职业生涯规划教育的思考

职业生涯规划对于人生发展具有极为重要的指导意义,对在校大学生进行职业生涯规划教育和指导,是高等学校人才培养的一项重要环节。文章针对高校学生对今后从业的认知现状和目前高校在开展就业教育工作中存在的不足,提出高等学校必须通过全程化和系统化的职业生涯规划教育指导,有效帮助学生发现和挖掘自身潜能,引导学生根据所学专业和个人志向及特长,设定毕业后的从业方向,确立大学不同阶段的努力目标,指导学生根据社会和个人发展的实际情况,实时修正从业方向和努力目标。在不断完善学生综合素质和专业技能的基础上,促进学生顺利完成学业、从容走向社会、尽早实现人生价值。     

异构多核处理器的任务分配及能耗的研究*

异构多核处理器采用不同的任务分配与调度算法,会导致不同的时间消耗与能量消耗,采用合适的任务分配与调度算法能节省较多的能耗。目前普遍认为最有发展前途的任务分配与调度技术是先用启发式方法进行分组,然后再用遗传算法进行调度。在改进任务分组后,又首次提出了用遗传算法解决能耗问题。实验结果表明在实时要求不高的情况下,能以较小的时间代价来节省较多的能耗。