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.

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..

Influence of green tea polyphenols on mitochondrial permeability transition pore and Ca^2＋ transport

The authors investigated the influence of green tea polyphenols(GPSs) on the liver mitochondria permeability transition pore(PTP) opening through mitochondria sweling and change of mitochcodrin membrane potetial .The data showed that GPSs had obvious protective effect on the Ca^2+ -induced PTP opening in a dose-dependent manner detected by mitochondria swelling.The results were obtained by meating the change of mitochondria membrane potential through Rh 123.Further experiments were conducted to examine the detailed influence of GTPs on Ca^2+ import and export of mitochondria.The results showed that GTPs had remarkably inhibitory effect on the Ca^2+-induced Ca^2+ import in mitochondria.and they could accelerate Ca^2+ -release from from mitochondria.Our data provide an altemate interpretation of the potent protective function of GPSs on cell against apoptosis.

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.

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。

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。

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。

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。

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。

自然光条件下基于Green函数的相位检索方法

基于强度测量的确定性相位检索技术将光学与计算结合起来,通过求解强度传输方程恢复相位信息,理论和实验证明是相位检索的可行途径.论文将Green函数应用于强度传输方程的求解中,给出Neumann和Dirichlet边界条件下新的推导方法.该方法中,Green函数的偏导数是四维矩阵,随着图像分辨率的提高,直接求解所占的内存空间比较大,提出了数值化处理方法,并推广到自然光条件下的相位检索中.同时,搭建了图像数据采集光学平台.模拟和真实实验验证了算法的正确性和实用性.

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。

中国式交通现代化的综合测度分析

交通现代化是中国式现代化的开路先锋,中国式现代化赋予交通现代化新的内涵。在中国式现代化理念导引下测度中国式交通现代化水平,对于更好地认识和推动中国式交通现代化具有重要意义。基于供需逻辑构建融交通设施设备进阶、交通系统优质发展以及交通赋能经济社会三个子系统的中国式交通现代化水平评价指标体系,结合全国31个省份2013—2021年数据,测度中国式交通现代化水平。结果表明:近年来中国式交通现代化水平呈现上升趋势,但省份之间也存在较大差别,总体上广东、北京、江苏、上海、山东、浙江等省份的水平相对较高,从四区域来看,东部地区发展水平相对较高,其他区域则相对均衡。总体上障碍度较高的因子包括:数字交通发展水平、快递量、人均路网密度、单位GDP货运周转量、交通科技创新环境投入强度等。本研究总体表明中国式交通现代化取得积极进展,但未来在不同省份、不同区域分类施策,以促进平衡发展、可持续发展仍至关重要。

绿色交通工程施工技术管理研究

文章主要针对当前绿色交通工程施工技术发展现状,对其在管理过程中出现的一系列问题进行研究。通过对整个施工过程的前、中、后期出现的问题进行探讨,提出了进一步加强绿色交通工程施工技术管理的方法,并从人、财、物、技术、制度五个方面进行介绍。通过研究,对新形势下绿色交通工程施工技术管理面临的问题和挑战进行了阐述,并提出了一些解决思路。

城市绿色交通发展对策研究——以昆山市为例

分析了绿色交通的内涵和构成体系,以昆山为例,分析了10余年来昆山城市交通发展取得的巨大成就以及快速城市化机动化背景下昆山绿色交通面临的问题,提出了昆山打造成为“国际一流、活力盎然”绿行都市的发展目标,完善并制定绿色交通发展指标体系,并从坚持交通引领、坚持绿行强基、坚持公交普惠、坚持数字赋能、坚持示范创新和坚持全民参与6个方面制定绿色交通发展对策措施,以指导昆山绿色交通高质量发展.

交通运输结构优化与城市绿色转型:来自地铁扩建的证据

交通运输结构优化是推动城市发展方式绿色转型的重要途径。以地铁建设作为准自然实验,基于2003—2020年278个城市的面板数据,构建多期DID模型考察交通运输结构优化对城市绿色转型的影响。研究发现:地铁建设可以有效促进城市发展方式绿色转型,且回归结果高度稳健;机制分析表明,地铁建设引发的外商直接投资、绿色技术创新与人力资本升级是地铁影响城市绿色转型的重要机制;地铁建设对城市绿色转型的促进作用存在异质性,在三线城市、西部地区以及非资源城市这一作用更明显。研究结论为交通强国背景下我国如何推动交通运输结构优化、充分释放地铁建设的绿色发展动能提供了政策启示。