A study of Facebook Groups members’ knowledge sharing

There have been many studies focusing on individuals’ knowledge sharing behavior in the organizational setting. With the rapid prevalence of social networking sites, many people began to express their thoughts or share their knowledge via Facebook website. Facebook is an open environment which does not provide any immediate monetary benefits to its users. Its Groups members’ knowledge sharing behavior could be different from the ones in organizations. We proposed a research model to examine factors which promote the Facebook Groups users’ willingness to share knowledge. The factors in the study include extrinsic motivation, social and psychological forces, and social networking sharing culture. We used PLS to test our proposed hypotheses based on 271 responses collected through an online survey. Our results indicated that reputation would affect knowledge sharing attitude of Groups members and sense of self-worth would directly and indirectly (through subjective norm) affect the attitude. In addition, social networking sharing culture (fairness, identification, and openness) is the most significant factor, not only directly affecting knowledge sharing intention, but also indirectly influencing the sharing intention through subjective norm and knowledge sharing attitude.     

一个带有时限的工程设计事务提交协议

通过分析协作设计活动的特点,给出了一个协作设计事务模型,并在此基础上提出了一个带有时限的工程设计事务两阶段提交协议,包括协议描述及故障处理。分析表明,带有时限的工程设计事务提交协议的性能在所有情况下优于基本两阶段提交协议。     

以Linux操作系统为平台提高C语言教学

C语言是高校计算机及相关专业重要的专业基础课,需要在教学中使得学生深入的了解认知C语言的本质,基于Linux教授学生C语言程序设计可以培养学生的动手能力、思维能力以及创新能力,多角度理解C语言本质,能有效地提高了教学质量,改善了教学效果。     

广州地铁黄村站联动调试工程项目管理要点

地铁站设备联动调试是项目管理的最后一关,直接关系到产品、设备功能和安装质量能否满足地铁站使用功能及各项功能的设计要求,为日后设备在最佳状态下运行创造先决条件,文中实例因涉及多个专业承包商而成为联动调试的一大难点。     

基于Fisher判别法的油纸绝缘老化阶段识别

本文首次将判别分析法用于油纸绝缘老化程度的识别,提出了一种基于Fisher 判别法和多个局部放电特征参量的油纸绝缘老化程度识别方法.以30个老化特征向量为经验样本,构造判别函数,将十一维特征向量映射到二维平面上,通过对其他30个样本进行老化程度的判别分析,结果表明采用Fisher判别函数能够对新样本的绝缘状态作出合理的判断.     

An Approach for Detecting and Locating Evolving Faults on Transmission Lines Based on Transient Traveling Waves

There has not been a satisfactory solution to identifying and locating evolving faults on transmission lines until now. This paper presents an integrated detection and location approach for evolving faults based on transient traveling waves. Evolving faults include two sequential faults, resulting in the change of fault phase. The feature aerial mode of captured current traveling wave only reflects the feature of the second fault occurrence, and is used for analyzing the second fault. By combining traveling wave and transient energy features, fault phase selection can be implemented at two stages: the initial fault occurrence, and the short period before fault clearance. The evolving faults can be determined according to the consistency of the two-stage phase-selection results. Subsequently, the positions of the two successive faults can be precisely acquired by individually implementing the double-ended traveling wave fault location on the initial fault phase as well as the feature aerial mode currents, respectively. Digital simulation studies based on the simulation software PSCAD/EMTDC demonstrate that the proposed method is feasible and effective.     

300 MW循环流化床锅炉耐火耐磨材料施工

循环流化床电站锅炉耐火耐磨材料工程是影响锅炉运行安全性和经济性的重要环节。在国内首台300 MW循环流化床电站锅炉的施工中,采用了大量的浇筑料、耐火砖、喷涂材料等。在锅炉耐火耐磨材料的施工中,在国内首次使用了“跳仓法”浇筑工艺,大直径耐火砖砌筑工艺、喷涂工艺和大型锅炉热烟气烘炉工艺等技术。通过现场大量的中、外技术交流和实验,总结出了一套适于电站锅炉耐火耐磨材料施工的工艺技术。通过工程实践证明此套施工工艺技术科学合理。特别是喷涂工艺和烘炉工艺,它弥补了中国大型循环流化床锅炉耐火耐磨材料施工技术的空白,为其它在建锅炉耐火耐磨材料的施工积累了宝贵的经验,也为循环流化床锅炉耐火耐磨材料开辟新的设计途径奠定了基础。     

一种具有坑蚀监测能力的管道内腐蚀监测系统

场指纹法由于可靠性好、耐高低温、寿命长,国外已较广泛地应用于油气管道、重要容器和结构的腐蚀监测。设计了基于电位矩阵法的管道内腐蚀监测系统。基于电位矩阵的监测系统由安装在管道外监测点矩阵、主控单片机、超精密前置放大和精密恒流源以及RS485/GSM传输数据模块构成。监测中心主要接收、存储、处理和分析来自各监测点测量系统的数据,得到管道的均匀腐蚀、坑蚀、冲蚀和焊缝腐蚀量。实验表明系统工作稳定,有良好的测量精度。     

Effects of Moisture on Furfural Partitioning in Oil-Paper Insulation System and Aging Assessment of Power Transformers

The furfural concentration in oil is a well-accepted chemical marker indicating the aging condition of power transformers. However, recent researches suggest that the furfural concentration in oil is affected by moisture, because moisture influences the furfural partitioning ratio in oil-paper insulation system. In this study, the correlation of moisture and furfural partitioning ratio was investigated. The accelerated thermal aging test and moisture absorption test were conducted to prepare oil-paper samples with different furfural and moisture concentrations. For samples with different moisture concentrations, the furfural partitioning ratios between oil and paper were compared. Results showed that samples with high humidity exhibited a high furfural mass fraction in oil. This finding implied that high humidity promoted the furfural diffusion from paper to oil. Further, the interference of moisture on aging assessment of insulation paper was analyzed. Results showed that the increase of moisture concentration in oil-paper system would significantly affect the accuracy of insulation paper aging assessment. A corrected equation for aging assessment of insulation paper with different moisture concentrations was established. Verification result showed that the equation could effectively correct the interference of moisture and enhance the accuracy of the aging assessment of insulation paper.     

主变保护差动比率制动曲线的测试

介绍了目前常见的主变保护装置在差动保护两侧电流的移相方式及消除主变变比和TV变比对差动保护的影响上的不同,例举了常见主变保护差动比率制动曲线的测试方法。