测速传感器的测评研究

提出了一种基于MC68332单片机系统的脉冲式测速传感器的测评的方法.详细论述了对脉冲式速度传感器的速度,脉冲占空比,幅度,相位差各个指标的测评原理,并给出了系统实现.试验表明该方法测评精确,使用简便,能够有效地对测速传感器进行测评.     

CPCD5系列叉车电控挂档机构的应用

随着港口对叉车使用要求的提高,特别是对叉车的驾驶操纵的舒适性的要求,叉车行走控制应用电控技术有向中小吨位叉车发展的趋势.     

包西铁路通道仁不营子黄河特大桥大体积混凝土施工防裂技术

大体积混凝土的防裂一直是混凝土施工中研究解决的课题,研究出来的成果和工法也不少,但由于地域、环境的不同,不可能形成标准的模式供大家采用。现就包西铁路通道仁不营子黄河特大桥大体积混凝土施工的防裂问题进行专题研究,以便指导施工。     

广州市洲头咀隧道工程总体设计

该文结合工程前期研究和工程设计情况,对洲头咀越江隧道工程总体布置作了简要分析介绍,重点就影响隧道总体布局的关键因素进行分析论证,并综述了工程的主要技术特点和技术创新点。     

濑户美浓窑对福建陶瓷的模仿和中日禅僧

12世纪以后的濑户美浓窑是对福建陶瓷的模仿,是福建陶瓷的日本化生产.濑户美浓窑的模仿生产,时间上正值东亚社会的国际局势发生动乱的时期,技术工艺上受福建陶工的直接指导,濑户美浓窑所模仿生产的产品,均为日本饮食文化和茶文化中所需要的器皿.为福建陶瓷工来到濑沪美浓提供方便的是福建和濑户美浓的禅僧以及福建和堺市的海商,而12世纪末期构建起来的福建与堺市的贸易体系基础--东海太平洋禅宗网络的存在使陶工的移动成为可能.     

我国航运电子市场的准入与退出制度

在简要介绍国内外航运电子市场发展和现状的基础上,结合航运电子市场在我国发展的实际需要,归纳建立航运电子市场准入与退出制度的必要性,着重分析当前我国航运电子市场准入与退出制度的现状,对我国进一步提高航运电子市场准入与退出的标准提出对策。     

RPC混凝土在铁路预应力T形梁中的应用试验

我国在迁曹铁路滦柏干渠大桥工程中，首次采用活性粉末混凝土（Reactive Powder Concrete，RPC）制作多孔预应力简支T形梁进行力学性能测试和行车监测，其中1孔（2片）进行了力学性能测试，5孔（10片）进行了行车监测，取得了良好的效果。通过RPC混凝土桥梁的制作和试验，总结了部分制作经验，通过力学性能测度，证明了RPC混凝土在铁路桥梁应用中的可行性和良好前景。     

ATCEM: a synthetic model for evaluating air traffic complexity

Air traffic complexity, which measures the disorder of air traffic distribution, has become the critical indicator to reflect air traffic controller workload in air traffic management (ATM) system. However, it is hard to assess the system accurately because there are too many correlated factors, which make the air traffic complexity nonlinear. This paper presents an air traffic complexity evaluation model with integrated classification using computational intelligence (ATCEM). To avoid redundant factors, critical factors contributing to complexity are analyzed and selected from numerous factors in the ATCEM. Subsequently, to construct the mapping relationship between selected factors and air traffic complexity, an integrated classifier is built in ATCEM. With efficient training and learning based on aviation domain knowledge, the integrated classifier can effectively and stably reflect the mapping relationship between selected factors and the category of air traffic complexity to ensure the precision of the evaluation. Empirical studies using real data of the southwest airspace of China show that the ATCEM outperforms a number of state‐of‐the‐art models. Moreover, using the critical complexity factors selected in ATCEM, the air traffic complexity could be effectively estimated. Copyright © 2015 John Wiley & Sons, Ltd.     

The relationship between the built environment and nonwork travel: A case study of Northern California

Many studies have found that residents living in suburban neighborhoods drive more and walk less than their counterparts in traditional neighborhoods. This evidence supports the advocacy of smart growth strategies to alter individuals’ travel behavior. However, the observed differences in travel behavior may be more of a residential choice than a travel choice. Applying the seemingly unrelated regression approach to a sample from Northern California, we explored the relationship between the residential environment and nonwork travel frequencies by auto, transit, and walk/bicycle modes, controlling for residential self-selection. We found that residential preferences and travel attitudes (self-selection) significantly influenced tripmaking by all three modes, and also that neighborhood characteristics (the built environment and its perception) retained a separate influence on behavior after controlling for self-selection. Both preferences/attitudes and the built environment itself played a more prominent role in explaining the variation in non-motorized travel than for auto and transit travel. Taken together, our results suggest that if cities use land use policies to offer options to drive less and use transit and non-motorized modes more, many residents will tend to do so.