大型原油码头引桥选型及跨度研究

以广东大亚湾拟建大型油码头钢引桥设计为例,并结合已建项目情况,研究大型油码头接岸引桥在不同跨度的条件下,引桥墩所受外力、钢材用量、施工难度及工程总体造价的变化情况,同时提出不同桥型设计的特点,可供类似工程设计参考。     

框架码头主体与接岸结构在变水位条件下的相互作用研究

目前,国、内外针对水深和水位变幅较大的内河架空直立式框架码头的研究成果不多,针对码头使用过程中主体结构与接岸结构间相互作用的研究就更少。根据这类码头的受力特点,通过在码头前方承台的横梁与接岸结构之间增设弹簧隔振装置模拟接岸结构和码头主体的作用力,利用PLAXIS软件研究不同的水位下降速度对码头主体与接岸结构间相互作用的影响,求得到结构的内力和变形,并在此基础上提出弹簧的刚度系数。     

A comprehensive dwelling unit choice model accommodating psychological constructs within a search strategy for consideration set formation

This study adopts a dwelling unit level of analysis and considers a probabilistic choice set generation approach for residential choice modeling. In doing so, we accommodate the fact that housing choices involve both characteristics of the dwelling unit and its location, while also mimicking the search process that underlies housing decisions. In particular, we model a complete range of dwelling unit choices that include tenure type (rent or own), housing type (single family detached, single family attached, or apartment complex), number of bedrooms, number of bathrooms, number of storeys (one or multiple), square footage of the house, lot size, housing costs, density of residential neighborhood, and commute distance. Bhat’s (2015) generalized heterogeneous data model (GHDM) system is used to accommodate the different types of dependent outcomes associated with housing choices, while capturing jointness caused by unobserved factors. The proposed analytic framework is applied to study housing choices using data derived from the 2009 American Housing Survey (AHS), sponsored by the Department of Housing and Urban Development (HUD) and conducted by the U.S. Census Bureau. The results confirm the jointness in housing choices, and indicate the superiority of a choice set formation model relative to a model that assumes the availability of all dwelling unit alternatives in the choice set.     

Technical innovation vs. sustainability – A case study from the Taiwanese automobile industry

The impact of global warming and climate change is the most critical challenge of the 21st century. The greenhouse effect caused by technological development and industrial pollution has accelerated the speed of global warming. To effectively reduce global warming and encourage sustainable enterprise development, a comparative analysis approach is used to examine various domestic automotive products which utilize the up-to-date innovative technology. Their contributions to fuel consumption and emissions of the greenhouse gas, carbon dioxide (CO₂), are then investigated. This study focuses on technical innovation in a conventional engine and output power. The results indicate that innovative engines (such as the Ford turbo petrol/diesel engine, the EcoBoost/TDCi) have improved energy consumption and CO₂ emissions. In addition, an improvement in output power (such as Toyota hybrid vehicles) has also improved energy consumption and CO₂ emissions.     

Robust stop-skipping patterns in urban railway operations under traffic alteration situation

In this paper an operation mode which is based on the stop-skipping approach is studied in urban railway lines under uncertainty. In this mode, each train follows a specific stop schedule. Trains are allowed to skip any intermediate stations to increase the commercial speed and to save energy consumption. As the commercial speed increases, the number of required trains in operation reduces and results eliminating unnecessary costs. To that end, a new mathematical model is proposed to reach the optimum stop schedule patterns. In the planning step, based on the traffic studies, the headway distributions are computed for different weekdays, and holidays. However, in practice, because of many unexpected events, the traffic may alter from what is planned. Therefore, in this condition, a robust plan is required that is optimized and immunized from uncertainty. In this paper, a new robust mathematical model, as well as two heuristic algorithms including (1) a decomposition-based algorithm and (2) a Simulated Annealing (SA) based algorithm is proposed. Finally, an Iranian metro line is studied and the optimum patterns are presented and analyzed.     

探讨泊位利用率数值的确定方法

借助排队论分析某港一期工程的统计资料,确定其港口服务系统的数学特征及主要特征值,探讨选取泊位利用率应考虑的因素,并提出一种确定泊位利用率数值的方法。     

Green approaches at sea – The benefits of adjusting speed instead of anchoring

In this paper, the concept ‘green approaches’ already used in aviation is applied to cargo transportation at sea. Instead of anchoring outside a port waiting for berth, ships can adjust their speed to arrive just in time for berthing. With improved incentives for reducing speed and shared information about berthing times, green approaches instead of anchoring can be a way to reduce fuel consumption and emissions without increasing the transit times of goods. The present study estimates the benefits to society as a whole for the EU ports in the Baltic Sea with Automatic Identification System data applying a new method using data collected in real time. Data consists of all anchored ships awaiting berth on 40 different occasions in 2015 and are subsequently extrapolated to a year. Fuel consumption by the individual ships, emissions and values are calculated from the detailed data with established models and estimates of unit values. The potential benefits are estimated at 27 million euros per year in the scenario where the near 15,000 anchorings by ships annually awaiting berth may instead start a green approach 12 h prior to arrival and may reduce speed by 25%, using the middle unit values for fuel and emissions. The methodology used in the paper can be applied to estimate the benefits of green approaches in other areas with anchored vessels.     

农用地估价中的评分估价法研究

针对国土资源部发布的《农用地估价规程》中的评分估价法的概念、步骤,就其实现方法进行了一系列的改进研究,提出采用回归分析法确定影响因素因子体系及其权重,并建立分值与价格之间的回归数学模型,同时采用模糊综合评判方法计算待估宗地的综合作用分值,最终得到其评估价格.     

机场跑道容量评估模型和估计方法的进一步研究

从管制员的角度出发，给出了跑道容量的定义，分析了影响跑道容量的因素，建立了到达和离场容量估计模型，给出了多种情况下跑道容量的计算方法，针对首都国际机场跑道的实际，开发了机场跑道容量评估系统，仿真结果验证了所提模型和方法的可行性。     

交际法教学及在大学英语教学中的应用

交际法英语教学引入我国已经多年,目前仍旧是比较流行的一种英语教学法。交际英语教学法把交际能力的提高作为语言学习的目标,承认语言与交际之间的相互依赖关系。《大学英语课程教学要求》提出培养学生英语综合应用能力,特别是听说能力,这与交际法所提出的“交际能力”是一致的,因此进一步研究交际法英语教学,并将其应用于大学英语教学中,是非常有益和必要的。