ERP沙盘改革管理信息系统课程的研究

管理信息系统是很多专业的核心课程,但由于内容庞杂,概念抽象,学生学习和理解有一定困难,利用这几年兴起的企业经营模拟沙盘培训对这门课程进行改革,在管理信息系统课程的不同阶段,加入企业经营模拟沙盘培训内客,使这门课程变得生动有趣且易于理解.     

多孔结构纺锤形α-Fe2O3的合成及光催化性能

采用碳酸钠和氢氧化钠为沉淀剂,在没有表面活性剂存在的情况下,通过水热法合成得到具有多孔结构的纺锤形α-Fe2O3,单颗粒长约为500 nm,孔径约为50nm.利用X线衍射(XRD)、透射电镜(TEM)、扫描电镜(SEM)和选区电子衍射(SAED)对产物的结构和形貌进行表征,并对多孔结构的形成机理进行解释.通过对甲基橙溶液的降解实验考查产物的光催化性能.光催化实验结果表明其催化性能优于一般α-Fe2O3纳米颗粒,这可能是由于其多孔结构和较大的比表面积造成的.     

工业化与城镇化进程中吉林省民营企业发展模式选择

吉林省工业化与城市化在全国居中、高水平,而吉林省民营企业发展却严重滞后,在全国居于后进水平,二者严重不相适应。要继续推进吉林省工业化与城市化,必须创新吉林省民营经济发展模式,总体上要按照集团化与集群化相结合的发展模式进行推进,加速民营企业产权改革进程,沿国际化路线进一步发展壮大,按照低碳、绿色、可持续发展的路径进行模式选择。     

浅议工程施工成本控制方法

加强成本管理是市政施工企业提高管理水平、经济效益和持续稳定发展的重要保证,是直接涉及影响企业信誉和生存的关键因素,是需要我们实实在在地面对和解决的问题.     

Sequence analysis of the Microcystis aeruginosa FACHB-912 phytochrome gene supports positive selection in cyanobacteria

The phytochrome gene from Microcystis aeruginosa FACHB-912,isolated from algal blooms in Taihu Lake in China,was sequenced and found to code for a wavelength transition light receptor protein.The gene was composed of five distinct domains:a PAS fold domain,a GAF domain,a phytochrome domain,a His Kinase A(phosphoacceptor) domain,and a histidine kinase domain.Red-absorbing phytochrome,far-red-absorbing phytochrome,and photoconversion kinetics were monitored via the spectral characteristics of the protein.To detect positive selection,homologous sequences from cyanobacterium phytochrome genes were obtained from GenBank.Potential selective pressure was identified by phylogenetic analysis with maximum likelihood analyses.The frequency of the phytochrome gene being subjected to selective constraints suggests that positive selection is a potentially important mechanism that promotes the evolution of the cyanobacteria phytochrome gene.The sites identified in this study provide targets for further research on the structural-functional role of these residues,and on the correlation with the mechanism of algal blooms.     

互通区跨线桥邻近路基墩柱偏移事故分析

结合工程实例分析了跨线桥墩柱偏移的原因,提出了偏移墩柱的处治措施.首先,通过现场实测揭示了邻近路基墩柱的变位性状,采用低应变动测评测了桥墩桩身损伤情况,并基于场区地基软土性状分析,指出邻近路基堆载是引起墩柱偏移的根本原因.然后,基于应变楔分析模型,提出了一种以桩顶位移为计算控制条件的桩身受力分析方法,并通过工程实例验证了该方法的合理性.最后,根据各桥墩支座偏位量情况,结合桩身受力验算与Bozozuk分析评价标准,对支座位移不大于50 mm的墩柱采用平衡堆载的处治方法;对支座位移大于50 mm的墩柱采用桩基顶推联合墩柱牵引的纠偏处治措施.结果表明,处治后墩柱支座偏移量分别降低了10.7%～43.7%和79.7%～100%,处治效果良好,对类似工程具有借鉴意义.     

Radon-Nikodym theorem in signed Loeb space

This paper gives the Radon-Nikodym theorem in signed Loeb space under 1-saturated nonstandard model. First,the nonstandard characterization of absolute continuity is discussed,on which Radon-Nikodym theorem in signed Loeb space is obtained. Then,some facts about a finite signed Loeb measure and its variation are shown.     

西藏自治区大学生创业意识的培养方式研究

文章结合目前西藏自治区大学生就业困难的严峻形势,分析了培养大学生创业意识的重要性和紧迫性,从社会层面、高校层面和大学生自身层面对西藏大学生创业意识的培养方法提出了相应对策,认为只有外因和内因结合、大环境和小环境相互映照,才能全面培养大学生的创业意识。     

河曲电厂空预器差压大的原因及处理

空预器是锅炉的重要设备之一,由于我国能源紧缺,火电厂所烧煤质越来越差,远远偏离了设计煤种,造成空预器三分仓回转式空气预热器堵灰,文章对造成烟气侧进出口差压大的原因进行了细致的分析,提供了河曲电厂空预器堵灰时空预器差压的详细资料,并介绍了采取的防范措施.     

Global awareness, future city design and decision making

Our world has been changing at an exponential rate.As a result of this rapid growth,we will be forced to make changes in not only the way we live in the environment but also in the environment itself such as designing the cities of the future to be in greater harmony with the increasing population and growing complexity.The paper contains both reflections on global awareness and comprehensive criteria and their priorities for choosing the most desirable city.