上虞市城市停车问题及管理对策探讨

在重视规划和建设停车设施的同时,更应该注重停车管理与控制,适量满足停车需求,以减少停车需求增长、优化和提高停车设施供应效率、规范停车行为.本文首先阐述了停车管理在交通系统管理中的作用,并对停车设施共享、制定更准确灵活的建筑物配建标准、远程停车与往返服务、实施TOD策略、改进停车诱导与信息系统、停车收费等一些停车管理策略做了介绍;针对上虞市存在的停车设施整体缺乏且供需不协调、停车设施结构不合理、停车管理力度不够、停车设施设计不合理等主要问题,结合上虞市的具体情况,提出停车收费、促进停车设施共享、提高现有停车设施的容量、改善停车设施设计、改进上虞市的步行与自行车出行环境等了一系列具体的停车管理对策.     

信息技术在汽车维修中的应用研究

为有效提升汽车维修成效,实现故障原因的快速判定与处理,需构建起完善的汽车维修体系,强化维修服务能力.文章以信息技术作为切入点,在明确现阶段汽车维修存在问题的基础上,对现有的汽车维修方式做出针对性的调整,稳步增强汽车故障诊断、排除成效,促进维修工作的信息化、智能化,旨在为后续汽车维修工作的开展提供借鉴参考.     

A two-sided market platform analysis for the electric vehicle adoption: Firm strategies and policy design

This study explores how to facilitate the electric vehicle (EV) diffusion from a two-sided market platform competition. We develop a stylized model depicting the platform competition between electric and gasoline vehicles by combining indirect network effects of consumer and energy supplier sides as well as vehicle manufacturers’ profits. The findings of this study provide several meaningful strategic and policy implications for EV manufacturers and policymakers who wish to enhance EV diffusion. First, EV sales are significantly influenced by indirect network effects from the energy supplier side to the consumer side, and vice versa. This implies that EV manufacturers who wish to boost EV diffusion should implement a strategy providing energy suppliers with incentives to willingly join the EV platform. Second, the dynamic nature of the effects of energy costs on platform competition might render counter-intuitive evidence that the drop in oil prices does not always negatively influence EV sales. This requires EV manufacturers to prepare a contingent strategy adjusting to such unexpected conditions. Third, governments should consider the energy supplier side as well as the consumer side in designing EV diffusion policies. When governments have a very challenging EV diffusion target, a balanced policy, which treats both gasoline and electric vehicle technologies fairly, may be more effective than a consumer subsidy policy.     

The Share-a-Ride problem with stochastic travel times and stochastic delivery locations

We consider two stochastic variants of the Share-a-Ride problem: one with stochastic travel times and one with stochastic delivery locations. Both variants are formulated as a two-stage stochastic programming model with recourse. The objective is to maximize the expected profit of serving a set of passengers and parcels using a set of homogeneous vehicles. Our solution methodology integrates an adaptive large neighborhood search heuristic and three sampling strategies for the scenario generation (fixed sample size sampling, sample average approximation, and sequential sampling procedure). A computational study is carried out to compare the proposed approaches. The results show that the convergence rate depends on the source of stochasticity in the problem: stochastic delivery locations converge faster than stochastic travel times according to the numerical test. The sample average approximation and the sequential sampling procedure show a similar performance. The performance of the fixed sample size sampling is better compared to the other two approaches. The results suggest that the stochastic information is valuable in real-life and can dramatically improve the performance of a taxi sharing system, compared to deterministic solutions.     

智力低下儿童的视觉—运动综合能力发育

用Ｂｅｅｒｙ’ｓ视觉－运动综合（ＶＭＩ）发育测验对６０名智力低下病儿作了评估，全部病儿的ＶＭＩ发育的年龄等值均落后于实际年龄，落后１５％～６２％。与韦氏智力量表总智商之间的相关系数为０．５２２５（Ｐ＜０．００１）。Ｂｅｅｒｙ’ｓＶＭＩ发育测验是国外广泛应用的儿童发育评估工具，对智力低下、学习困难等发育疾病的诊断很有帮助，值得推荐。     

Developmental Competence of Frozen-thawed Germinal Vesical Porcine Oocytes by Vitrification Method following Maturation,Fertilization and Culture In Vitro

The storage of oocytes is important for ad-vances in reproductive biology and infertility treat-ment. The cryopreservation of mammlian oocytesis one of the most techniques for gene preservationand producing individuals with a new combinationof genes. Since Whittingham et al.[1]reported thatmouse ova could be successfully cryopreserved,many researchers have attempted to freeze unfertil-ized mammalian oocytes. The microtubular spin-dles of metaphase (M ) oocytes to which thechromosome is attach…     

长春轻轨发展历程及特点

长春轻轨被业内人士普遍认为是典型的轻轨系统,也是今后可以广泛推广的轻轨制式。长春轨道交通轻 轨制式(以下简称轻轨)发展较早,目前已经运营 61.5 km,建设运营经验较为丰富。其中 3 号线是国内首条运营轻 轨线路,已有 17 年历史。随着 3、4、8 号线最终建设完成,里程将达 110 km。2018 年 7 月《国务院办公厅关于 进一步加强城市轨道交通规划建设管理的意见》(国办发〔2018〕52 号)发布,轻轨再次进入许多城市的考虑范围。 长春轻轨各系统的建设及运营经验可以作为重要的经验借鉴和参照标准。针对长春典型轻轨系统,分析其发展历 程、规划建设特点及设计创新与技术特点。秉承“量力而行、有序发展”的原则,长春选择了先轻轨后地铁的双 网融合、主辅结合的建设模式。实践表明,建设之初选择运量较大、投资较低、外形美观大方、节能环保的典型 轻轨系统,符合长春市经济实力及发展需求,有利于规划线网的快速形成。这种发展模式也对与长春经济实力大 体相当的一些大、中城市发展轨道交通具有借鉴意义     

投标过程中的不平衡报价

为了获得更多的收益,投标者在投标过程中必须讲究一定的报价策略.不平衡报价就是投标者经常使用的一种有效方法.笔者给出了不平衡报价的意义、使用条件,在此基础上分析了不平衡报价给投标人带来的收益和可能存在的风险,并利用线形规划理论提出收益预测模型.     

人工湿地在污水处理中的研究进展

人工湿地是根据生态学原理产生的一项新型污水处理技术,具有其独到的特点和优势.在重视生态保护的今天越来越受到人们的关注.人工湿地是一项具有发展前景的污水生态处理技术.潜流人工湿地已在世界各国研究应用.本文主要介绍了人工湿地的分类,研究进展、发展趋势以及对人工湿地的展望.