网络信息资源动态发展利用的周期性研究

与非网络信息资源相比,网络信息资源因用户的参与而表现出动态的发展利用过程,这种动态发展利用过程主要表现在用户对网络信息资源的浏览、下载、转载、上传和评论等方面。在假设网络信息资源动态发展利用具有周期性的基础上,本研究采用跟踪观察法,通过统计SNS网站、论坛和微博三种平台上网络信息资源的浏览、转载和跟帖增量,分析增量发展趋势,并从中发现网络信息资源动态发展利用具有先快后慢的规律;使用SPSS统计软件生成网络信息资源动态发展利用的趋势图并将其动态发展利用的周期划分为生长期、成熟期和衰退期三个阶段。     

线性回归方法在高压电缆质量控制中的应用

该文把实际中对高压电缆质量影响较大的变量局放值作为因变量,把影响电缆质量的其他指标:绝缘层平均厚度,内屏蔽厚度外屏蔽厚度,偏心度,热延伸,外护套厚度,电缆外径,电阻值,耐压值作为自变量进行线性回归,将作用不明显的变量删掉,利用最小二乘法得回归方程,经检验回归方程对于实际问题有一定的指导意义。     

N2分压对（Ti，A1）N涂层成分、结构及力学性能的影响水

采用电弧离子镀工艺,调节N2分压制备了系列（Ti,A1）N硬质涂层,研究了不同N2分压对涂层表面形貌、相结构、成分及力争性能的影响．结果表明,当氮气分压较低时,涂层金属相含量较高,涂层硬度和残余应力较低,膜／基结合力较高,涂层耐磨性较差;当氮气分压较高时,涂层氮化物相含量较高,涂层硬度和残余应力较高,膜／基结合力偏低,涂层耐磨性很强．     

结合扩展LoB滤波的距离保持水平集方法

二项分布拉普拉斯边缘检测算子LoB主要利用图像的二阶微分。作者在此基础上结合图像的张量信息提出了改进的LoB滤波算子,作用于距离保持水平集方法的面积项,从而构造出新的模型。与原模型相比,该模型提高了图像的演化速度,能够分割多目标物体且对具有丰富尖角细节、深度凹陷和狭窄缝隙的图像拥有较好的分割效果。     

区段灌注技术-场放大进样-毛细管电泳手性拆分山茛菪碱

首次采用结合区段灌注技术及场放大进样的毛细管电泳技术对山莨菪碱四种异构体进行了拆分。详细探讨了溶液pH值、拆分试剂含量、分离缓冲充入时间、分离电压等对测定的影响,优化了实验条件。在75mmolL-1Tfis—H3P04（pH3．5）为分离缓冲溶液,1．7％羧甲基-β-环糊精（CM—β—CD,1．0psi,90s）为拆分试剂,分离电压17．5kV条件下,23分钟内完成山莨菪碱四种异构体分离。并通过场放大进样进一步提高了测定的灵敏度。该方法成功应用于测定颠茄制剂中山莨菪碱,结果满意。     

对开展竞技健身气功比赛的思考

健身气功的竞赛应该从健身气功本身的特点和衡量应用功法的能力、动作要领掌握等要求出发,以身体活动形式的规范性、呼吸吐纳应用的控制、心理调节能力的状况等诸多方面去评定,通过比较客观的监测手段（血压、脉搏遥控）进行临场角逐。     

Elemental Forms

This paper considers the way the nineteenth-century newspaper was oriented towards information. Despite their political differences, nineteenth-century newspapers were often discussed as if they were universal, with a paper for every segment of society. My argument is that this apparent universality, where the newspaper was figured as a print genre potentially open to all, laid the foundations for the emergence of the popular press. The paper is in two parts. The first considers the nineteenth-century newspaper as a genre, arguing that its periodicity enabled it to serve as a perfect medium, passing on content derived from elsewhere. The second explores the way information was conceived in the period. By looking at the way the newspaper drew upon, represented, and distributed information, it is possible to understand how it functioned as material media. In conclusion, I look at the way the nineteenth-century newspaper is changed through digitization today. When scholars access nineteenth-century newspapers through digital resources, they engage with a different material media that, in turn, reconfigures the source material. Such encounters foreground the importance of genre while providing new opportunities for its study.     

油浸式电流互感器局部放电故障实例分析

结合辽宁电力有限公司某变电站油浸式电流互感器局部放电的故障实例,对该设备结构、故障情况、试验数据和解体检查等方面进行阐述和分析,得出导致此次局部放电的原因是绝缘受潮的结论。最后,对电流互感器的制造工艺和检测方法提出了具体建议。     

螺山水文站采用流量权重系数推求断沙的探讨

悬移质输沙率及断面平均含沙量测验目前主要采用的方法是以部分流量加权法求得,该法需在含沙量测验的同时进行流量测验.通过对螺山水文站多年实测悬移质输沙率资料的分析计算,得到各取样垂线间部分流量权重系数,再利用垂线平均含沙量与垂线间部分流量权重系数的计算即可得到断面平均含沙量.该法能实现含沙量测验与流量测验异步,减少流量测次,降低生产成本,能更好地控制含沙量的变化过程.     

Students’ Socioscientific Reasoning and Decision-making on Energy-related Issues—Development of a measurement instrument

The concept of energy is one key component of science education curricula worldwide. While it is still being taught in many science classrooms from a mainly conceptual knowledge perspective, the need to frame the concept of energy as a socioscientific issue and implement it in the context of citizenship education and education for sustainable development, is getting more and more explicit. As we will be faced with limited fossil fuels and the consequences of global climate change in the future, students have to be supported in becoming literate citizens who are able to reach informed energy-related decisions. In this article, we focus on students’ reasoning and decision-making processes about socioscientific energy-related issues. In more detail, we developed a paper-and-pencil measurement instrument to assess secondary school students’ competencies in this domain. The functioning of the measurement instrument was analysed with a sample of 850 students from grades 6, 8, 10 and 12 using item response theory. Findings show that the measurement instrument functions in terms of reliability and validity. Concerning student ability, elaborate reasoning and decision-making was characterised by the use of trade-offs and the ability to weigh arguments and to reflect on the structure of reasoning and decision-making processes. The developed measurement instrument provides a complement for existing test instruments on conceptual knowledge about the concept of energy. It aims to contribute to a change in teaching about energy, especially in physics education in the sense of education for sustainable development.