6缸柴油机改用单排气总管的模拟计算与实验研究

某车用柴油机改型为船用,排气管相应地由风冷改成水冷。本文对原机进行了模拟计算和实验校核。在此基础上,对改用水冷单排气总管的机型进行模拟计算,对排气管结构,进、排气阀正时对柴油机运行的影响进行了分析。实验研究表明：采用单排气总管增压系统,新的机型能够满足功率要求,在低工况下燃油经济也较好。     

枢纽互通立交平面线形指标与立交用地的敏感性分析

随着高速公路网络化的不断深入,枢纽互通立交的数量也不断增加。文章首先从立交形式、匝道布设、设计速度及线形指标几方面分析了互通立交占地的主要影响因素;接着根据立交枢纽的几何特征,用试算的方法对不同圆曲线半径和缓和曲线参数对立交占地的影响做了详细分析;找出了控制立交规模的合理途径和方法,对枢纽立交的设计提出了建议。     

人员可靠性综合管理系统

人因失误研究包括个体特性和组织管理两大方面。基于我国目前状况，本文更着重人员的社会属性和精神属性，强调组织管理对人员可靠性的贡献。在此基础上，综合利用组织行为学，管理心理学和可靠性技术手段，构造了员可靠性管理系统。该系统力图对人误问题提供广泛的和完善的管理模式。它的有效性取决于全企业从上到下的通力合作。     

抗噪声减疲劳保健药物的研究

研究了噪声在生化领域对人体的伤害，分析了噪声通过多项生化指标对人体产生的影响；设计出科学的动物模拟试验方案，通过反复实验和分析，初步找出了在噪声刺激下，人体生化指标肝糖原、肝谷丙转氨酶、乳酸脱氢酶等的变化规律，筛选出最优的抗噪声保健药物配方（抗噪１号），为进一步进行人体临床试验和研制抗噪声保健品奠定了基础。     

Combining Intermodal Transport With Electric Vehicles: Towards More Sustainable Solutions

Abstract

This paper analyses the feasibility of incorporating electric or hybrid vehicles in intermodal transport for the transportation of containers in the pre- and post haulage (PPH) operation. In Europe, the intermodal transport market is being strongly supported, as it is seen as one of the keystones of a sustainable mobility system policy. The introduction of environmentally friendly electric/hybrid vehicles for the pre- and post haulage operation would mean a further enhancement leading to a more complete ecological intermodal transport chain. PPH operations are usually no longer than 30 km, and, hence, could possibly be handled by electric or hybrid vehicles.

Hybrid electric vehicles (HEV) combine electric and other drive systems, such as internal combustion engines, gas turbines and fuel cells. Hybrid electric vehicles merge the zero pollution and high efficiency benefits of electric traction with the high fuel energy density benefits of an energy source or thermal engine. The use of electrically driven vehicles for goods distribution has already been successfully proven in international demonstration projects, such as ELCIDIS. Transport of intermodal units (such as ISO containers), however, requires electric/hybrid heavy-duty goods vehicles, which are not readily available on the market, but for which the technology exists.

Different possibilities are assessed as to their technical, financial, organizational and environmental feasibility and suitability. This analysis is based on a typical mission for pre-and post haulage operations, such as type of trips, distance, frequency, urban/suburban, etc.     

Revisiting port pricing; a proposal for seven port pricing principles

A review of seven large landlord port authorities around the world reveals a notable diversity of pricing structures. While port authorities increasingly act as commercial undertakings, port pricing often seems to be not driven by commercial considerations. In this paper, we argue that ports can be regarded as “business ecosystems” with multiple users. This provides a valuable perspective on pricing and raises the question of whether ports can be regarded as two-sided markets. We argue this is not the case. The business ecosystem perspective provides a basis for deducing seven pricing principles for port authorities that are detailed in the paper and illustrated with cases these principles. These pricing principles are broadly follow a direct user pays approach; capture value from “non-core” tenants; price aggressively for activities with a high strategic value; differentiate pricing based on price elasticity and connectivity improvements; maximize revenue from long-term lease agreements, price port dues competitively; critically consider differentiation of charges based on environmental performance; and finally use incentives to align interests of terminal operators and shipping lines. We conclude that the ecosystem perspective is central to the understanding of pricing decisions of port authorities and that various pricing issues deserve more attention.     

施耐德Quantum PLC在木薯干接卸及灌包工艺系统中的应用

施耐德Quantum PLC系统功能强大,具有模板化、体系结构可扩展的特点,广泛用于工业和制造过程中的实时控制。其同时提供了IEC要求的LD、FBD、SFC、IL、ST5种编程方式,用户实现其控制思想的手段大大增强;CPU单元可选586控制器,单机支持超过300个回路和65000点I／O,背板总线速率高达80M;可靠性高,所有I／O模块均可带电热插拔;提供多种控制系统和仪表系统的接口模块,     

环型交叉口公交优先通行措施及其影响研究

结合环型交叉口的特点,探讨环型交叉口施行公交优先措施的先决条件及其具体设置参数。在此基础上,运用间隙接受理论提出实施公交优先措施后交叉口通行能力的计算方法。最后结合实例对公交优先措施实际效果以及它对通行能力的影响进行研究。     

拱形索塔的空间稳定性分析

拱形索塔是斜拉桥塔柱的一种新形式,矢跨比较大使其有别于一般的拱结构。文中分析了拱承斜拉桥索塔稳定性影响因素,并比较了非线性因素影响,探讨了拉索非保向力对索塔侧倾的作用。