岩滩水电站水文预报方案研究

文章介绍了红水河岩滩水电站水文预报的方案、内容及作业方法。     

Pre-positioning of relief items in humanitarian logistics considering lateral transhipment opportunities

The main objective of this study is to investigate the inclusion of lateral transhipment opportunities into the humanitarian relief chain and to examine the effect of different parameters on minimizing the average distance travelled per item while serving the beneficiaries. Direct shipment model (DT), lateral transhipment model (LTSP) and maritime lateral transhipment model (MLTSP) are developed and compared between each other by using a real life earthquake scenario prepared for the city of Istanbul by JICA (Japanese International Cooperation Agency). Developed mathematical models decide on the locations and number of disaster relief facilities, quantity of relief items to hold at those facilities, and quantity of lateral transhipment between the facilities. Vulnerability of the roads and heterogeneous capacitated facilities are also considered. It can be concluded that both LTSP and MLTSP models gave better results than DT model and lateral transhipment option helps beneficiaries to obtain relief items faster and with higher service level.     

城市轨道交通站点周边“灰色用地”选区研究

在对我国轨道交通建设的投融资问题进行探讨的基础上,研究了城市"灰色用地"规划对轨道交通建设的适应性,指出这种动态用地规划模式可以提高土地的使用价值和利用效率,解决轨道建设投融资的部分问题,并结合苏州轨道2号线建设对轨道站点周边"灰色用地"选区方法进行了详细研究。     

大型灯泡贯流式水轮发电机组定子铁损试验及参数选择

广西桥巩水电站发电机组定子铁芯组装工作在现场进行,根据国家规程规范规定,对现场叠压装配的定子铁芯进行铁芯损耗试验,通过铁损试验检查定子铁芯压紧螺栓的压紧情况和发现铁芯局部发热的故障点及绝缘性能。本次试验通过对定子铁损试验接线方式择优选择、试验参数合理的计算和试验结果详细的分析,使试验误差降低到最小值,单位铁芯损耗值等各项指标均优于国家或厂家的标准值,为电站今后定子检修提供参考。     

广西容县浪水电站挖潜改造展望

广西容县浪水电站是一座以发电为主的多功能电站,在县电网和梯级开发中处于骨干和中心地位。近年来,随着工农业的迅猛发展和社会的需求,当地的用电量迅速增长,因此浪水电站需要进一步挖潜改造和扩容增效,以确保其在县电网中的地位和作用。     

绿色货运发展的问题与对策研究

发展绿色货运对促进货运行业节能减排,提高运输效率具有十分重要的意义。本文首先介绍了绿色货运产生的背景,接着阐述了绿色货运的内涵,然后探讨了我国发展绿色货运中存在的主要问题,最后提出了发展绿色货运的对策与建议。     

Classifying a customer as a national account

A recent article [Stevenson and Page, Industrial Marketing Management 8, 94–100 (1979)] addressed the issue of how industrial marketers determine if their firms can use national account marketing. Once that decision is made, a next logical step is to determine which customers should be classified as national accounts. This article discusses appropriate classification criteria that industrial marketers can use to make such decisions. The information presented here is based on a study of national account marketing.     

西岸水电站水工结构设计

文章主要介绍了一些河床式低水头水电站的水工结构设计思路，针对河床式低水头径流水电站的特点，并结合笔者多年设计实践经验，进行西岸水电站水工结构布置，供同类水电站水工设计借鉴。     

Urban freight demand forecasting: A mixed quantity/delivery/vehicle-based model

The research germinates from the statement that the cities have to solve the impacts due to freight transport in order to improve their sustainability implementing sets of city logistics measures. But city logistics measures involve several actors and choice dimensions. It is therefore important to have methods and models able to assess the effectiveness of the measures to be implemented. The current models were mainly developed to simulate some aspects of urban freight transport, and are not able to forecast many impacts of implementing traffic and transportation measures at an urban scale.This paper presents a modelling approach that tries to point out the relations existing among city logistics measures, actors and choice dimensions. It comprises three model sub-systems to estimate the quantity O–D matrices by transport service type (e.g. retailer on own account or wholesaler on own account or by carrier), the delivery O–D matrices by delivery time period, and the vehicle O–D matrices according to delivery tour departure time and vehicle type.This modelling system is a multi-stage model and considers a discrete choice approach for each decisional level. It was first tested using some data collected in the inner area of Rome, including traffic counts and interviews with retailers and truck-drivers. The model estimations were also compared with the experimental ones, and quite satisfactory results were obtained.     

The evolution of a regional container port system: the Pearl River Delta

This study investigates the progress of container port system development in South China, focusing particularly on the interplay between Hong Kong and the other ports in the Pearl River Delta (PRD) region. After identifying the downgrading trend of Hong Kong from a transshipment hub port for Asia and for China as a whole to a regional load center and the emergence of other deep-sea direct-service ports, the paper looks into the causes of this structural change of the port system. Four major causes are identified: the cost-base competition, the impact of the unique “one-country two-systems” policy, the impact of globalization and container standardization, and the impact of multi-modal accessibility and connectivity. The paper reveals that the interplay between different governments and between the governments and port operators are the local mechanisms that together as a whole respond to the shippers’ needs and the shipping lines’ pressure. It confirms that the interdependencies and competitive relations between terminals are being played out at a regional level. While the particular situation of the PRD is unique in many regards, the features emerging there, with its dominant hub, its network of feeder ports and its emerging direct-service non-hub terminals, are being replicated elsewhere.