TN系统接地故障保护的探讨

分析了TN系统接地故障保护存在的问题,指出了解决对策,阐述了低压断路器接地脱扣器动作电流整定值及动作时间的设计与选择。     

关于虚拟仪器开发工具的比较与选取

随着虚拟仪器日益广泛的应用,支持虚拟仪器开发的各种工具也迅速发展起来,因此需要非常慎重取舍才能获得最佳效果.为使虚拟仪器开发者能更快更高效地选择适当的开发工具,本文将当前流行的虚拟仪器开发工具进行分类、分析和比较研究.首先将其总体分为两类:基于通用编程软件和基于图形化语言,然后根据各类开发工具在虚拟仪器开发方面的特点进行论述,同时给出相关实例,最后得出,对于虚拟仪器的开发,常需要根据开发项目的实际,结合各种开发工具各自的优势,进行混合编程,方可达到良好的效果.     

大理500 kV输变电工程通信系统设计研究

通过收集电力系统光纤通信无中继传输的情况,确定在500 kV大理变光纤通信工程中建设中继站,分析光缆经过地区的通信现状,以及架设OPGW光缆的线路环境情况,研究出一套光纤中继站选择方法,并应用于500 kV大理变光纤通信工程中,取得了很好的效果。文章还介绍了光纤中继站电气、接地、土建等方面的设计情况,对将来电力系统光纤中继站的建设有很强的参考价值。     

试论道德接受

道德接受是发生在道德领域中的特殊的接受活动.道德接受活动是一个复杂的过程,其中,道德需要是道德接受的动力,道德选择是道德接受的前提,道德内化是道德接受的关键,道德环境是道德接受的外部条件.     

桂林独秀峰山前城市形态空间历史演变

由静江府修筑城池图、桂林旧郡城图、桂林新郡城图、王府图等图对桂林独秀峰周围城市空间发展的历史作简要阐述，对桂林城的选址、朝宗渠的作用及靖江王府的演变等问题进行了探讨．桂林城中心区域的空间形态演变始终以政治和文化为核心，在岭南地域具有相当的影响力，通过对该区域具体分析研究，使人们能对桂林城中心的发展脉络有更清晰的认识，更好地保护和利用桂林的自然景观资源和历史文化资源。     

Intramaze and Extramaze Cue Processing in Adult APPSWE Tg2576 Transgenic Mice.

The present study examined spatial and nonspatial learning in adult Tg2576 mice. Transgenic mice were impaired in acquisition of a T-maze forced-choice alternation task. However, mutant mice were as sensitive as control mice to the introduction of retention intervals and proactive interference, and this suggested that short-term memory processes were intact in Tg2576 mice. Probe trials revealed that the Tg2576 mice did not use an allocentric strategy to navigate to the goal arm. However, mutant mice acquired an intramaze brightness discrimination, a simple room discrimination, and a contextual biconditional left-right discrimination in a T maze. Results suggest that Tg2576 mice are able to process both intramaze and extramaze stimuli but are impaired in forming an allocentric representation of their environment. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

多目标模糊综合评价的装配序列优选方法

为了对装配序列进行合理评价,确保装配序列优选结果的正确性,提出一种装配序列多目标模糊综合评价方法.通过调研及专家知识构建装配序列多目标评价指标体系,并定义各指标的量化方法;用模糊层次分析法评估各指标间的相对关系,以获取较准确的装配序列指标权重;根据评价指标的量化方法计算可行装配序列各指标的初始值,并结合指标相应权重使用消除和选择转换法综合评价不同装配序列的优势值和劣势值,根据优势值和劣势值排序结果,从正反两方面综合选择出最佳装配序列.以某企业机床传动系统X轴装配序列优选过程为例,验证了该方法的有效性.结果表明,可行装配序列综合评价结果合理,优选出的方案具有较好的精度和效率.装配序列多目标综合评价方法计算过程简单,实用性强且评价结果合理,可用于一般机械产品的装配序列设计过程.     

浓香型大曲酯化力的测定方法探讨

从酯化反应的温度、底物浓度、用曲量、酯化时间几个方面着手,本着便于操作、能真实反映大曲酯化能力的相对大小、与生产实际相联系的原则,通过试验,选择合适的测定大曲酯化力的方法。     

An analysis of activity scheduling behavior of airport travelers

A nested logit model is presented that can be used to predict the activity pattern of travelers inside an airport based on their socio-demographical characteristics (e.g. gender, age), group size, and travel related information (e.g. number of bags, airport size, and total available time). The availability of such a model enhances representation of the behavior dynamics when simulating airport pedestrian traffic. An internet-based revealed preference survey was used to collect data from persons that visit airports including both travelers and non-travelers. The survey focused on the agenda of subjects’ most recent airport trip, the frequency and attitude concerning certain types of activities they performed inside the airport, and the socio-demographic characteristics of each respondent. Three possible nested logit model structures are analyzed and one has been identified as a plausible and statistically acceptable nested structure. Also, the empirical results demonstrate the applicability of a nested logit model for use in identifying travelers’ activity patterns in an airport.