信息技术设备电气间隙、爬电距离的设计与测量

电气间隙和爬电距离是信息技术设备的一项重要电气安全指标,由于其涉及的因素较多,导致产品设计人员和检测人员容易出错。本文详细介绍了电气间隙和爬电距离的定义、如何计算不同绝缘的限值,并结合日常检测中遇到的常见问题进行了详细的说明、提出了相应改进建议。     

不确定环境下基于质量功能展开的电动汽车技术特性综合重要度确定

电动汽车技术特性重要度的确定是电动汽车研发的关键环节,能协助研发主体优化资源配置,更好地满足顾客需求。综合考虑顾客需求、竞品情况、技术可得性情况以及企业自身实力情况,提出一种不确定环境下基于质量功能展开的电动汽车技术特性综合重要度确定模型,为电动汽车制造企业提供了一种科学、有效的开发工具。该模型利用基本不确定语言信息刻画不确定评估信息,模型的基本过程为:识别顾客需求,并利用最佳—最差权重确定方法(BWM)确定顾客需求重要度;确定顾客需求与技术特性关联关系,基于顾客需求重要度确定技术特性基本重要度;利用BWM方法,确定基于竞品分析的修正重要度、基于技术可得性的修正重要度以及基于自身实力的修正重要度;综合基本重要度与修正重要度,确定技术特性综合重要度。最后,以某一企业的电动汽车研发案例为对象,论证了该模型的可行性与有效性。     

CSAMT方法在仓上金矿外围及深部找矿中的应用

仓上金矿位于三山岛—仓上断裂西南部，西邻渤海湾，是我国大型露天金矿之一。至2005年闭坑后，在矿山外围及深部找矿一直未取得新进展。为加大勘探深度，探查矿区外围和深部断裂及岩体的空间展布情况，寻找深部金矿资源，采用CSAMT方法在该区开展了测深剖面勘查工作，并与以往的物探资料及331号地质剖面进行了综合对比分析，结果显示F1推断断层与三山岛—仓上断裂相吻合，提出验证钻孔1个。经钻探工程验证见金矿体，取得了较好的应用找矿效果，为下一步开展地质找矿提供了有价值的地球物理信息依据。     

TSL:predicting popularity of Facebook content based on tie strength

The rapid development of online social networks leads to an explosion of information,however,there are great differences in the popularity of different messages,and accurate prediction is always a great difficulty is the current study.Popularity prediction of online content aims to predict the popularity in the future based on its early diffusion status.Existing models for popularity prediction were mostly based on discovering network features or fitting the equation into a varying time function that the accuracy of current popularity prediction model was not high enough.Therefore,with the help of the weak ties theory in sociology,the concept of tie strength was introduced and a multilinear regression equation was constructed combined with the early popularity.A TSL model to predict the popularity of Facebook’s well-known pages was proposed.The main contribution of this article was to solve the problem and few or no work based on sociology.A high linear correlation between the proportion of faithful fans was existed in Facebook homepage with frequent shares in the early and the future popularity.Compared with other baseline models,an experimental study of Facebook (including 1.54 million shares) illustrates the effectiveness of the proposed TSL model,and the performance is better than the existing similar methods.     

The Spatial Patterning of Alcohol Outlets in Post-Disaster Christchurch,New Zealand: Practical and Policy Implications

Natural disasters greatly impact the environment of affected societies with often unknown consequences. In this study we examine the impact that the Canterbury Earthquakes of 2010–2011 had on the distribution of alcohol outlets in Christchurch, New Zealand. Specifically, we compare the distribution of both on-site and off-site alcohol outlets pre- (December 2009) and post-earthquake (December 2014) and use spatial regression models to identify whether any neighbourhood-level factors predict the observed redistributions. Overall, the number of alcohol outlets decreased by almost 13% after the Canterbury Earthquakes. However, we found a moderate increase in the clustering of both outlet types of outlets in the post-quake period. Increases in rates of both on-site and off-site alcohol outlets in neighbourhoods were positively associated with the percentage of residents who resided in their neighbourhood < 5 years and with neighbourhood crime rate change, while negative associations were found with percentage population aged between 15 and 29 years. The results suggest that the changing spatial distribution of alcohol outlets in Christchurch was not random but driven, in part, by the emergent demographic composition of neighbourhoods. The significant practical and policy implications of a redistribution of alcohol outlets are outlined providing a tangible link between empirical research and practice in an urban environment plagued with post-disaster spatial and social uncertainties.     

基于最大边缘分配算法的雷达博弈波形设计

实战背景下雷达目标先验信息有较大的不确定性,基于先验信息设计的波形不能满足参数估计的需要。为解决该问题,提出了一种博弈条件下的雷达波形设计方法。考虑到雷达与干扰机在电子对抗中的非同时性,采用Stackelberg博弈框架进行建模。该方法以优化雷达能量谱分布为策略,采用最大互信息准则建立效用函数。博弈过程中,雷达与干扰机各自根据对手策略优化发射波形,经过多次迭代,双方达到纳什均衡。仿真实验对比了均衡策略与maxmin策略与随机策略,证实了所提算法的有效性。     

数据信息化时代下的工程造价管理

在经济不断迅猛发展的形势下,新时代的经济形式催生出一些多元化企业和职业,信息技术的不断发展使数据信息成为最具价值的财富。在信息传播极其迅速的今天,工程造价在数据信息时代下的管理模式也不断更新变化,以适应多元化的工程项目形式。因此信息数据的大量搜集和相关研究受到了各大科研机构和各类企业的高度关注。     

认知闭合需要对农户规范施药行为的影响研究——基于信息加工的中介效应

文章利用辽宁省农户微观调查数据,从认知心理学角度应用结构方程模型分析了认知闭合需要对施药行为的影响机理。研究结果表明:认知闭合需要水平越高,农户施药行为越不规范。具体而言,规则性偏好和确定性偏好程度越高,其施药行为的规范性越低;心理封闭对农户施药行为没有显著影响。同时,认知闭合需要对农户施药行为具有间接影响,且在规则性偏好和确定性偏好对施药行为的间接影响中,信息加工产生了中介效应。     

基于AIC信息准则的Delta T声发射源定位方法

疲劳断裂是金属结构中的主要失效形式,而金属结构中的早期疲劳断裂信号通常难以检测。TOA方法是常用的声发射定位源方法,但是声波传播过程中波速变换和路径的复杂性对其结果影响很大。运用Delta T声发射源定位方法,用断铅实验模拟声发射源,用AIC信息准则对到达时间进行优化,通过使用差值求源点坐标和图像处理的方法,求得声发射源坐标。通过在平板上的实验,比较两种源定位方法在不同结构中的定位结果,分析定位误差,结果表明图像处理方法更为优秀。