Modeling cyclists' facility choice and its application in bike lane usage forecasting

In some circumstances on streets equipped with new bike facilities, cyclists are not interested in using them. Instead, they continue to use shared spaces with pedestrians or motor vehicles. Thus, simply adding a bike facility does not guarantee that cyclists will switch to using it. Owing to the considerable development of bike facilities, the investigation of facility preference, particularly focusing on facility choice forecast, has become increasingly important. This study developed a model for predicting the facility choice of cyclists between on-street facilities (curb, traffic lane, and bike lane (BL)) and off-street facilities (sidewalks). Initially, the optimal model was selected using Bayesian Model Averaging method. Then, it was validated by both internal and external validations. Apart from the aforementioned factors, several other exogenous variables were also found to be significant predictors of bike facility choice, including the width of traffic lanes, existence of real-time stopping vehicle, type of bike, bus stop existence, and in-group cycling. Analysis of the relative importance of predictors indicated that bus stop existence, effective sidewalk width, and type of bike were the potential predictors. A framework for predicting BL usage, if it is present, was also developed. A test for the predictive performance of the application at a real site was carried out. By comparing predicted and actual BL usage figures, the analysis showed good predictive performance. The results of this study can help developers, planners, and designers to adopt reasonable investment decisions as well as better designs in developing new bike facilities.     

Similarity of the measured NIC of a BioRID II dummy in car-to-car rear end impact and sled experiments

The Japan New Car Assessment Program (J-NCAP) evaluates the performance of cars in terms of protection against whiplash injuries in rear-end collisions. In the test protocol, a simplified triangular acceleration is applied to the sled. This study clarifies whether biofidelic rear-impact dummy II (BioRID II) measurements obtained for simplified triangular acceleration reflect car-to-car rear-end impacts in real-world accidents in Japan. We conducted a car-to-car rear-end impact experiment and a simplified-triangular-acceleration sled test. Our results indicate that the time series of dummy responses were approximately consistent in the two test conditions. The neck injury criterion (NIC) and maximum acceleration of the head and T1 measured using the BioRID II dummy were similar in the car-to-car and sled experiments. This revealed that the J-NCAP test protocol using simplified triangular acceleration reflects the car-to-car rear-end impact experiment using Japanese cars, in terms of the NIC and maximum acceleration of the head and T1.     

PRETTA:A COMPUTER PROGRAM FOR PWR PRESSURIZER’S TRANSIENT THERMODYNAMICS

Introduction　　 For a safe reator operation in PWR,the pre-diction of the pressure during various transients isessential.For this purpose,the pressure predic-tions made by the computer codes based on theequilibrium pressurizer models developed in theearly 1 96 0 ' s are not always satisfactory. TheThree Mile Island(TMI) accident has resulted inan increased emphasis on the capability of simulat-ing system transients with greater accuracy[1] . Fora pressurized waterreactor,the accurate pred…     

日本三菱公司制动系统的最新技术和产品

介绍了日本三菱公司轨道交通制动系统的历史及发展,着重从系统及部件的角度,较全面地介绍了其轨道交通制动系统在模块化及控制方面取得的最新进展.     

SKF公司开发的高速车辆用轴承

介绍了SKF公司最新开发的高速列车用紧凑型圆锥滚动轴承组件。     

Profile-speed data-based models to estimate operating speeds for urban residential streets with a 30 km/h speed limit

A speed limit of 30 kilometres per hour (km/h) has been widely introduced for urban residential streets to ensure traffic safety and allow these streets to fulfil other intended functions. However, excessive speeds on these roads are very common, causing traffic safety problems and threatening the liveability of neighbourhoods. An effective and active way to deal with speeding is the application of a performance-based design approach, as mentioned in previous research. In a performance-based design approach, street geometrics and roadside elements are selected based on their influence on the desired driving speeds. The relationship between driving speeds and street features therefore needs to be determined. Although several studies have developed operating speed models for urban streets, all of these models were calibrated based on data for streets with speed limits of more than 30 km/h. The present research is designed to investigate the influence of various roadway and roadside characteristics on operating speeds on urban tangent street sections with a 30 km/h speed limit using profile-speed data. A simultaneous equation regression with a three-stage-least-square (3SLS) estimator was used for the modelling effort. The driving speed models developed in this study incorporate several street design factors, which provide helpful information for urban planners and street designers to cope with speeding issues on residential streets.     

Efficacy of bus service reorganization utilizing a hub-and-spoke topology and DRT to meet community needs: A case study of Tokigawa town

The purpose of this study is to verify the efficacy of a route/timetable reorganization methodology focused on a hub-and-spoke schedule bus architecture as well as the introduction of demand responsive transport (DRT) in suburban or underpopulated areas in Japan to accommodate local requirements.     

舰船电缆耦合的有损传输特性分析预测

论文针对工程中的电缆耦合的有损传输问题,着重开展了电缆耦合的有损传输特性分析及预测。主要运用多导体传输线的理论建立电缆耦合的等效电路,并分析了有损传输线上的电压电流分分布。在此基础上,仿真分析了电缆耦合的影响因素以及耦合干扰传输特性,从而实现了对电缆耦合的有损传输特性预测。     

基于多层面同构的船舶智能电网理论体系研究

技术进步极大地促进着技术体系的不断发展和完善,智能电网技术以其所具备自愈、兼容和集成等技术优势和潜力在构建面向未来的船舶电网过程中将起到决定性的主导作用。首先针对船舶综合电力系统和智能电网进行简要论述;以两者在技术本质上的一致性和相似性为出发点进行同构分析,并解析船舶电网智能化即"船舶智能电网"的技术内涵;最后,从理论模型、技术组成、关键技术和"绿色"评价体系四个方面构建并完善船舶智能电网理论体系。     

基于梁板结构的船舶系统可靠性分析及其优化

采用梁元和加筋板格元来模拟船舶空间结构,并建立相应的系统可靠性分析与优化模型。针对加筋板格可靠性分析中计算反向结点力向量时忽略加强筋影响而导致计算结果偏于保守的缺点,采用了完整加筋板格元的反向结点力向量和修正刚度矩阵,在此基础上采用分支限界法搜索系统主要失效模式并对其提出改进措施,保证了计算精度并提高了计算效率;运用界限搜索法求解模糊约束集的最优水平截集,进而求得系统可靠性约束下结构质量的模糊最优解,并与确定性优化设计结果对比,结果显示模糊优化模型具有更好的经济效益,可供工程借鉴使用。