10kV配电线路带电作业导线遮蔽罩温升特性分析

导线遮蔽罩作为绝缘遮蔽用具已广泛运用于10kV配电线路带电作业中,但遮蔽罩过热会影响其绝缘性能,威胁工作人员安全。利用有限体积法建立了导线遮蔽罩温度-流体场计算模型,研究了导线载流量、风速和日照强度等对软、硬质导线遮蔽罩温升的影响。结果表明,额定负荷条件下,软、硬质遮蔽罩的最大温升分别为19.1、17.5K,硬质遮蔽罩的散热效果较好;导线遮蔽罩温升随负荷电流的增加呈指数规律增大,随环境风速的增加而下降,但下降幅度逐渐减小,日照强度是导线遮蔽罩温度过高的主要因素之一。     

矿用钢丝绳芯输送带无损检测系统研究

带式输送机是煤矿工业生产中非常重要的运输工具,而钢丝绳作为带式输送机的常用部件,其可靠性在很大程度上影响到带式输送机的安全运行,甚至直接影响到煤矿企业的安全生产。采用"电磁变量补偿传感器"、"三位磁感应桥"及"自平衡同步励磁"等无损探伤组合技术,实现与生产运输同步工作运行、全天候无人值守的全自动无损探伤模式,实现对钢丝绳无损在线检测,保证设备的安全运行,避免重大安全生产事故发生,具有重要的经济和社会效益。     

Distributed key management scheme for peer‐to‐peer live streaming services

Live media streaming over peer‐to‐peer (P2P) network structures is commonplace nowadays. However, with the large number of users in a typical P2P system, it is impractical to use the central server to process the key information update requests of all the users Accordingly, the present study proposes a distributed key management scheme in which the server is only required to transmit the key update information to a limited number of users. To further reduce the load on the server, the update information is distributed using a hop‐by‐hop approach. An effective method is proposed for protecting the key update information as it is propagated through the network. In addition, a technique is presented for ensuring the security of the certificates used in the system It is shown that the distributed key management scheme and authentication procedure ensure an efficient and secure P2P live streaming performance even in the event of high churn rates. Copyright © 2012 John Wiley & Sons, Ltd.     

高压盘式不停输封堵技术在宁波北仑地区的应用

结合工程实际，论述了高压燃气管道不停输封堵施工的盘式封堵施工工艺、介绍了盘式封堵作业中的风险控制及注意事项。此外，从设计角度提出对工艺改进的建议。     

The surprising potency of implicit egotism: A reply to Simonsohn.

This article addresses Simonsohn's (2011) critique of field studies of implicit egotism. We argue that Simonsohn provides no compelling theoretical reason to believe that implicit egotism should be valid only in the laboratory. In addition, we argue that a careful analysis of most of Simonsohn's studies of implicit egotism shows that they provide little or no power to reveal real effects of implicit egotism. We conclude that it is more constructive to try to identify theoretically derived moderators of implicit egotism than to try to document that it is always spurious in the field. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

非洲人的一种形象——巴勒斯《人猿泰山》中的主题分析

巴勒斯是美国通俗小说界的泰斗。作为生活在帝国观念盛行及帝国主义者横行全球的年代的艺术家,他不可能是孤立的存在,时代的烙印及作为臣属民族一员的记忆不可避免地反映在他的作品中。巴勒斯在《人猿泰山》中从遗传、道德、文明三方面逐一诋毁非洲人。     

BS5400规范中的荷载及荷载组合

结合对英国规范BS5400中有关荷载规定的理解，就对国内桥梁设计具有重大参考价值的内容，从恒载、二期恒载、活荷载、荷载组合等方面进行了介绍，对于大跨度桥梁横向的动力分析有很好的帮助。     

TV guide: Two-year-old children learn to use video as a source of information.

Learning to use symbols is a challenge for young children even when the symbol in question (e.g., a live video image) is iconic and seems transparent to adults. This research examined the effect of experience on children's use of video-presented information. Two-year-old children saw themselves "live" on their family television for 2 weeks and then participated in an object-retrieval task. The children reliably used a live video presentation of an adult hiding a toy in an adjoining room to find the toy. Most also transferred what they learned to a task involving another symbol (pictures) that typically is very difficult for this age group. The results reveal flexibility in 2-year-olds' symbol use that follows from successful representation of a symbolic relation. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

视频点播技术与直播技术比较和在远程教学中的应用

文中简要的介绍和比较了4种视频点播和直播技术，并以Real技术为例讲述了如何在远程教学中使用视频点播和直播技术。     

便携式电缆局部放电检测系统的研制

局部放电是造成XLPE电缆绝缘劣化的主要原因。检测局部放电信号能判断电缆绝缘状态,减少电力绝缘击穿事故发生。研制了一套新型便携式电缆局部放电带电检测系统,阐述了工作原理与硬件设计。系统基于高频电流法、特高频法和超声法,对电缆的绝缘状态进行评估,通过结合三种检测方法的数据分析,大幅提高了系统抗干扰能力和检测结果的可靠性。