Application Strategy of Green Transportation Concept in Urban Road Design

Urban traffic and urban environmental pollution are important issues that must be taken into account in the process of urbanization,especially in China.Modernization has enabled many developed countries in the west to carry out rational city traffic planning.At the same time,the concept of green transportation has also emerged,integrating low-energy consumption,low pollution,comfort,and safety into urban traffic to effectively solve issues pertaining to traffic and pollution.The concept of green transportation has been widely adopted in China and made popular in many cities,thereby promoting the sustainable development of cities.

Pedestrianisation and Parking Policy as a Solution towards Green Transport Plan： A Case Study of Zagreb

Strategy of development trends in this moment and at this stage of the traffic comes from understanding the possibilities of the implementation of measures to raise the quality of movement and life in the city. It also includes planning and implementation of targeted interventions in the transport network or facilities. Mobility is a complex process in the area, starting from the departure from the apartment, using various means of transportation, a number of activities in different goals until to return to the location of the apartment. It thus requires extensive transport infrastructure in the form of walkways, bicycle paths, street and railway network. At the same time, reshaping of public transport facilities is needed in which the pedestrian, biker and green concept shall be the main elements of the new spatial conditions. Pedestrian zones development in the city means to create pedestrian areas and green islands in all the places in the city where possible. This process is essential for the transformation of public spaces, in particular, transport corridors. To accomplish the concept of the green transport plan, the need for change in the parking policy is emphasized. This should be an integral part of the city planning and should go hand in hand with the traffic policy.

Fuzzy Comprehensive Evaluation Research of Goal Attainment of Green Transportation Development Policy —Take Dongguan “Motorcycle Ban” Policy as an Example

Launching the evaluation research of green transportation can grasp the green transportation implementation accurately and diagnose the existing problems. From the perspective of green transportation, this research chose Dongguan “motorcycle ban” policy as the research object, and constructed secondary evaluation index system in transportation and environmental harmony, transportation and future harmony, transportation and society harmony, transportation and resource harmony, four dimensions. Then it used fuzzy comprehensive evaluation model to do the evaluation and found that the policy’s positive effect on the Dongguan green transportation development was average. Finally, based on the evaluation results, measures and advices were proposed.

Design Strategies of Urban Cluster Based on the Concept of Green Transportation

Taking the planning practice of green transportation in Sino-Singapore Tianjin Eco-city as an example,the key factors and design strategies for its healthy development were summarized from the aspects of the coordination of land use and traffic development,the development of the public transport plus slow traffic model,and the development of reasonable and humanized traffic management measures,through analyzing the connotation and scale of green cluster.In addition,the design strategies of the green transportation concept suitable for the development of urban clusters represented by Guangming New District in Shenzhen were proposed,so as to provide a reference for promoting better the coordinated development of green traffic and cities,and maximizing the economic,social and environmental benefits of green transportation development.

Dilemma and Solution of Green Transportation Construction under the Background of Urban Development

With the development of the city and the increase of the population, the demand for transportation is increasing. The increases in transportation ways and demand have also brought certain energy and environmental problems to transportation construction. A good transportation environment and green travel experience have an important role in promoting the happiness of urban life and the sustainable development of society. Based on this, the following solutions are proposed for the construction and development of urban green transportation. First, as a guiding role, the government should formulate active transportation and green transportation policies to promote the reform of multiple public transportation methods. Second, as a leading role, the market can support a variety of the construction of green travel modes, which could encourage the development of shared bicycles and new energy vehicles. Third, as the main role of city, the citizens would like to choose green travel tools with the guidance in the conscious level. If we built green behavior into a fashionable business card of the city, green behavior will lead the city’s transportation construction and development.

The Construction of a Green Transportation System of China

Since the 21 st century, the transportation industry in China has achieved rapid growth with a significant increase in the transport capacity; however the development has also greatly impacted the energy saving & environmental conservation. This paper takes into account non-commercial vehicles such as private cars in the statistics of energy consumption and pollution of Chinese transportation system. This method extends on previous methods which solely include commercial vehicles in these statistics. Based on more comprehensive quantitative data, it reviews the progress in the energy saving and environmental conservation efforts by the Chinese transportation industry and points out that the rapid increase of energy consumption and pollution emission and the deterioration of traffic congestion are prominent problems in the development of the Chinese transport industry. The main reasons for theses problems include the unbalanced development of different transport modes, the irrational layout of integrated transport hubs, the inadequate law, regulations and standards, and the use of suboptimal technology. Based on these findings, this paper proposes several goals for the construction of a green transportation system in China including the establishment of a transportation management system, the improvement of transportation energy efficiency, the control of environmental pollution and the alleviating of urban traffic congestion. Additionally, it points out that in order to build a green transportation system in China, multiple aspects should be enhanced, i.e., the formulation of traffic planning, the optimization of transport structure, the development of urban public transport, improvement of integrated hubs, administration of energy saving and environmental conservation, development of intelligent transportation systems, technical innovations, etc..

绿色交通与城市可持续发展——基于低碳交通运输体系试点政策效应评估

以低碳交通运输体系试点政策作为一项准自然实验,基于2006—2021年中国282个地级市面板数据,运用空间双重差分法探究绿色交通政策与城市可持续发展的关系及其作用机制,结果表明:绿色交通政策的实施能够促进城市可持续发展,并经过一系列稳健性检验结果依旧显著,且在空间DID下,绿色交通政策具有显著正向的直接效应;异质性检验表明,绿色交通政策对超大城市的间接效应显著为正,对特大城市的间接效应表现为负向,而对大城市及以下城市可持续发展则无明显影响,对东部与东北地区城市可持续发展具有更为明显的促进作用;绿色交通政策可以通过科技创新促进城市可持续发展。研究结论为绿色交通政策促进城市可持续发展提供了新视角和新思路。

The Effect of Time-Stepping on the Accuracy of Green Element Formulation of Unsteady Convective Transport

Despite the significant number of boundary element method (BEM) solutions of time-dependent problems, certain concerns still need to be addressed. Foremost among these is the impact of different time discretization schemes on the accuracy of BEM modeling. Although very accurate for steady-state problems, the boundary element methods more often than not are computationally challenged when applied to transient problems. For the work reported herein, we investigate the level of accuracy achieved with different time-discretization schemes for the Green element method (GEM) solution of the unsteady convective transport equation. The Green element method (a modified BEM formulation) solves the boundary integral theory (A Fredholm integral equation of the second kind) on a generic element of the problem domain in a way that is typical of the finite element method (FEM). In this integration process a new system of discrete equations is produced which is banded and hence amenable to matrix manipulations. This is subsequently deployed to investigate the proper resolution in both space and time for the chosen transient 1D transport problems especially those involving shock wave propagation and different types of boundary conditions. It is found that for three out of the four numerical models developed in this study, the new system of discrete element equations generated for both space and temporal domains exhibits accurate characteristics even for cases involving advection-dominant transport. And for all the cases considered, the overall performance relies heavily on the temporal discretization scheme adopted.

高速公路绿色能源系统体系架构初探

高速公路为我国工业化与城镇化的推进做出重要贡献,能源系统支撑高速公路履行位移使命,与之而来的巨大碳排放量、环境污染等负面效应亦愈发凸显。当前高速公路能源系统的运行严重依赖于大电网,可再生能源渗透率低,部分偏远地区能源可及性差,粗排放、非协同增长方式难以满足高速公路的安全、高效、绿色与智能用能要求。在此背景下,能源交通融合发展成为践行“交通强国”战略和“30·60”双碳战略的必然选择。本文首先分析现有高速公路能源系统的不足之处,结合能源互联网和综合能源系统理念,提出建设高速公路绿色能源系统,以充分发挥高速公路自身的资源禀赋优势;接着建立高速公路绿色能源系统体系架构,用以指导系统构建;进而基于实际运行需要,综合技术研究现状与难点探讨,从需求、功能、技术、物理四个层面进行体系架构解析;然后分析了高速公路绿色能源系统建设涉及的两个科学问题;最后对高速公路绿色能源系统未来的研究重点做出展望。

城市低碳转型背景下绿色交通内涵解析与发展路径

发展绿色交通是贯彻落实生态文明思想和国家绿色发展战略、实现“双碳”目标、促进城市交通系统可持续发展、引导城市低碳转型的关键举措。针对当前绿色交通实践工作主要聚焦于交通工具或交通设施的局限性,提出绿色交通的内涵是基于以人为本、高质量和可持续发展理念,以追求低能耗、低排放为核心目标,同时满足交通与城市发展协调、交通运输效率和效益改善以及人民群众出行品质提升的发展新范式。基于全生命周期、全要素系统发展路径,从交通运输节能降碳、高品质服务人的需求和塑造低耗城市空间形态3个方面提出发展绿色交通的措施建议,助力城市加快实现“双碳”目标。

When LoRa meets distributed machine learning to optimize the network connectivity for green and intelligent transportation system

LoRa technology contributes to green energy by enabling efficient,long-range communication for the Internet of Things(IoT).This paper addresses the challenges related to coverage range in outdoor monitoring systems utilizing LoRa,where the network performance is affected by the density of gateways(GWs)and end devices(EDs),as well as environmental conditions.To mitigate interference,data throughput losses,and high-power consumption,the proposed spreading factor(SF)and hybrid(data rate|SF)models dynamically adjust the transmission parameters.The orchestration of concurrent data modifications within the network server(NS)is crucial for uninterrupted communication between GWs and EDs,especially in monitoring electric vehicle(EV)stations to reduce traffic congestion and pollution.Employing K-means and density-based spatial clustering of applications with noise(DBSCAN)algorithms optimizes ED allocation,averts data congestion,and improves the signal-tointerference noise ratio(SINR).These methods ensure seamless information reception by meticulously allocated EDs across various GW combinations.To estimate the free-space losses(FSL),a log-distance path loss model(log-PL)is used.Exploring various bandwidths(BWs),bidirectional communications,and duty cycles(DCs)helps to prevent saturation,thus prolonging the operational lifespan of EDs.Empirical findings reveal a notable packet rejection rate(PRR)of 0%for the DBSCAN(hybrid model).In contrast,the K-means exhibits a PRR ranging from 5%(hybrid model)to 35.29%(SF model)for the ten GWs combination.Notably,the network saturation is reduced to 10.185%and 9.503%,respectively,highlighting an improvement in the average efficiency of slotted ALOHA(91.1%)and pure ALOHA(90.7%).These enhancements increase the lifespan of EDs to 15,465.27 days.

含不相关机的多目标混合流水车间调度

考虑不相关机和传送等因素的多阶段混合流水车间问题,以最小化最大完工时间和总能耗为优化目标建立整数规划模型。针对该问题,提出一种多目标离散灰狼优化算法来求解。设计基于机器分配码和速度选择码的编码方式和基于最短处理时间原则的解码方案;采用反向学习策略改进初始灰狼种群质量;将基于多点变异的自走模式和基于均匀两点交叉与多点交叉的跟随模式结合构成搜索模式以协调开发和搜索能力;引入精英保留策略确保优良个体不丢失。通过一系列的仿真实验验证了该算法的有效性。

科技创新与数智化引领全球交通合作新趋势——全球可持续交通高峰论坛会议综述

2023年9月25-26日,由中华人民共和国交通运输部主办的主题为“可持续交通:携手合作助力全球发展”的全球可持续交通高峰论坛(2023)在北京举办。习近平总书记向全球可持续交通高峰论坛致贺信,深刻阐述了建设可持续交通体系的重要作用,充分彰显了中国坚持对外开放、谋求合作共赢的立场,为推动全球可持续发展贡献中国智慧。论坛同期举办了第十五届国际交通技术与设备展览会,并发起设立全球可持续交通创新联盟。论坛发布了中国关于推进全球发展倡议、落实联合国2030年可持续发展议程、推动可持续交通发展自主贡献的《北京倡议》,以及《2022年中国可持续交通发展报告》,签署了多项合作文件,将有力推动全球交通可持续发展。

北京公交集团绿色低碳转型经验及未来发展路径研究

在全球气候变暖的背景下,绿色低碳转型已成为公共交通行业实现可持续发展的核心战略。本文深入探讨了北京公交集团在绿色低碳转型过程中的实践经验,分析了其在推动新能源公交车应用、优化能源结构、提升运营效率等方面的具体做法和取得的成效。同时,指出了在转型过程中存在的技术挑战、基础设施配套不足、实现碳中和难等问题。基于此,提出了未来北京公交集团绿色低碳转型的主要路径,包括进一步调整车辆能源结构、提升车辆使用效率、利用数据手段赋能、开展绿电绿证交易、做好能耗精细管控和提高全体员工节能意识等措施。这些措施旨在为地面公交企业的绿色低碳转型提供参考,助力实现碳达峰碳中和目标。

可再生能源合成绿氨研究进展及氢-氨储运经济性分析

可再生能源和氢能产业快速发展,氨作为储氢介质,因其能发挥长时储氢和长距离运氢的作用,受到广泛关注。化石燃料制氢合成氨工艺成熟,但二氧化碳排放强度大。绿氨以可再生能源电解制氢作为氢源,具有减少合成氨产业碳排放、消纳风光等可再生能源、充当储氢载体易于储运等优势,在碳达峰碳中和的目标下,开发绿氨合成工艺具有重要意义。本文总结了工业Haber-Bosch法合成氨、电化学、光催化、等离子体和化学链合成氨取得的研究进展及面临的挑战,阐述了可再生能源电解制氢合成氨工艺的技术路线和发展现状,对比了煤制灰氨和可再生能源制绿氨工艺的技术经济可行性,分析了电价、电解制氢能耗等因素对电解制氢合成氨成本的影响,论述了分别以氨为载体储氢和储存液氢的成本构成,研究了分别以氨为载体运氢和运输气氢的成本,提出了对绿氢合成绿氨、以绿氨为载体储运氢产业发展的思考。

基于公交优先的干线协调信号控制改进模型

基于公交信号优先策略,对MULTIBAND模型进行改进,重新定义了权重系数、车道清空时间和最小绿波带宽,结合不同相位放行方式实施红灯早断或绿灯延长控制策略,并在此基础上考虑公交车辆的车速与停靠时间,建立对公交车辆的约束,提出基于公交优先的干线协调信号控制改进模型。通过VISSIM仿真,将该模型与传统干线协调信号控制模型对比分析,结果表明:与传统协调控制模型相比,模型使社会车辆平均延误降低了4.77%,停车次数降低了3.77%,公交车辆平均延误降低了11.35%,停车次数降低了2.06%,人均延误降低了7.22%,且在不同的公交流量下均有较好的效果。

基于匝道控制及尾气计算模型的高速公路绿色交通管理研究

随着高速公路车辆的增多,大量汽车排放的尾气导致高速公路附近的环境受到极大的威胁。匝道是在立交处连接立交上、下道而设置的单车道单方向的转弯道路。在高速公路的道路上通常都设有一个控制与检测点。为了提高高速公路附近的自然环境质量,研究提出了一种基于匝道控制和尾气计算模型的策略,该策略通过对匝道控制进行优化,减少车辆在道路上的停留时间,从而减少尾气排放。对研究提出策略的实际应用效果进行分析,结果说明,研究提出的交通策略可有效减少汽车尾气,从而提升高速公路附近的环境水平,促进绿色交通的发展。

绿色技术创新企业多维画像体系构建与应用研究——以我国绿色交通技术领域为例

[目的/意义]文章通过构建绿色技术创新企业的多维画像体系,并以我国绿色交通技术领域为例进行实证研究,旨在全面了解特定领域的企业在绿色技术创新方面的现状、优势和障碍,从而为相关政府部门和企业决策者提供科学的参考和建议。[方法/过程]文章基于资源基础观和环境依赖理论遴选企业内外部标签,设计出一套多维标签体系,来客观描述企业在盈利能力、科研创新、社会舆论和环保责任等方面的表现;然后,从投入产出2个阶段出发,构建绿色技术创新效率指标体系,通过无导向超效率SBM模型,计算企业在各年度下的绿色技术创新效率值;再利用Malmquist全要素生产率指数,分析企业效率值的动态变化趋势。[结果/结论]文章以绿色交通领域为例进行实证分析,验证了本研究提出的方法能够有效评价上市企业的绿色技术创新能力,并分析了技术效率变化的原因。此外,通过对财务实力、绿色创新能力和社会舆情聚类得到5类绿色交通企业,为各类型企业制定差异化竞争战略提供有效指导。

模糊条件下考虑低排放和可折叠箱的空箱调运优化研究

为满足集装箱场站和港口的空箱需求量,建立绿色可持续交通运输体系,基于运营总费用最低及碳、硫气体排放量最少研究多计划期集装箱空箱调运问题。考虑空箱供给和需求的不确定性,应用梯形模糊数进行处理,建立模糊机会约束规划模型,将模型转化为确定形式后采用NSGA-Ⅱ算法进行求解分析。结果表明,运输费用是运营总费用的主要影响成分,同时海铁联运模式更有助于减少总费用和碳、硫气体排放量。在可折叠箱和标准箱混合运输模式下可得,购箱成本是影响可折叠集装箱使用的关键因素。适当降低可折叠集装箱购箱成本后,混合运输组织模式可以实现比运输全标准箱更低的运营总成本。同时,采用适当比例的可折叠集装箱能够降低碳和硫气体排放量,有助于交通运输业的绿色低碳发展。

绿色运输对陆路运输企业绿色运输效益的影响

收集2011—2021年陆路运输业企业绿色发展指标数据及内部营运要素配置、财务数据,采用数据包络、判别分析及回归分析法进行实证研究。结果表明:2011—2021年中国陆路运输业绿色发展取得较好成绩,优先发展高速铁路运输、加快等级公路建设等有效减少了环境污染;绿色运输显著提升了陆路运输业上市公司的绿色运输效益;公司负债水平越低,营业收入、净资产增长越快,绿色运输效益越好。在此基础上提出陆路运输业未来发展重心。