连续箱梁冬季电伴热施工

电伴热系统的保温原理是利用当交变电流经伴热电缆通过伴热管壁时,在集肤效应和邻近效应的作用下,电流不是均匀沿着管壁流动,而是集中在伴热管内表层通过,在管壁电阻的作用下,通过电流发热,经传导使模板温度升高,保温层粘贴于伴热电缆外侧以减少热量的散失,降低整个系统的电能消耗,有利于减少整套系统的运行费用。     

浅析烽火物流存货库位管理

在物流管理中,库位管理是一个非常重要的环节。库位管理即是通过确定每一种物料的恰当储存方式,在恰当的储存方式下的空间储位分配。在确定物料的恰当储存方式方面,烽火物流经历了四个阶段的变革。各个阶段所体现的库位管理思路各不相同,但对于内部物流的改善具有重要意义。     

关于宁夏邮政涉入医药物流的探讨

文章在分析了物流在医药行业发展中的重要意义以及宁夏邮政涉足医药物流市场的基础上,通过对宁夏中邮物流公司药品的物流管理的分析,提出了宁夏邮政医药物流存在的问题及解决的方法。     

铁路储运服务一体化探讨

为更好地实现铁路物流服务延伸,指出铁路运输企业需首先拓展仓储服务,以延长纵向物流服务对货物的掌控时间,方能支持拓展物流相关服务。接着分析仓储与运输服务整合的层次性,提出铁路运输企业首先在内部构建储运服务一体化,综合利用发站、到站、中途节点站以及货车的仓储能力,实现全路货场货位的联合运用,发挥全路货场货位的整体效益,以构建铁路虚拟仓库系统、完善TMIS功能、建立有效的效益分配机制等手段,支持铁路储运服务一体化的实现。     

粮油储藏的意义及储藏技术探讨

我国是农业大国,粮食产量在国民生产总值中一直占据十分重要的地位。粮油生产作为重要的经济和生存手段,粮油的储藏也具有非常重要的意义。提高我国粮油的储藏技术也显得更加重要。     

阿联酋粮食战略储备项目工艺设计的先进性

阿联酋粮食战略储备项目规划总存储能力726 760 t,一期粮食存储能力为276 760 t。粮库分为稻谷仓和小麦仓,均为28 m直径钢筋混凝土筒仓,稻谷仓单仓仓容9 960 t,共6栋,小麦仓单仓仓容15 500 t,共14栋。以及与之配套生产附属设施,主要包括工作塔、汽车发放站、控制室、转接塔、输送栈桥等。进仓设备能力为1 200 t/h,出仓设备能力为600 t/h。     

A new model of luggage storage time while boarding an airplane: An experimental test

The boarding process is on the critical path of the turn-around. Reduction in boarding time can benefit airline carriers and airports and improve passenger satisfaction. However, aisle interference caused by passengers placing their luggage during boarding is a key factor leading to cabin congestion and low boarding efficiency. Therefore, the storage time for the carry-on luggage and its influencing factors is analyzed in this study. An experiment was conducted in a B737-800 model (1/3 size) to explore the factors effecting the time of luggage storage, and a new effective model of luggage storage time is proposed through a significance test and data fitting. The results show that the age of passengers, the type and quantity of luggage, and the existing luggage in the luggage bin have a significant impact on the luggage storage time; the rule of the variation in luggage placing time is similar between young adult passengers and middle aged passengers; the impact of the existing luggage in the overhead bin on the luggage storage time shows a stable trend in the initial period, but with the quantity of the luggage increasing to a certain point, the luggage storage time begins to increase sharply, which is known as a “jump”; and the luggage type has a great influence on the threshold value of jump. The results of the study can provide a reference for airlines to manage cabin luggage to improve boarding efficiency and improve passenger experience.     

Variable neighborhood search heuristic for storage location assignment and storage/retrieval scheduling under shared storage in multi-shuttle automated storage/retrieval systems

This paper examines the joint optimization of storage location assignment and storage/retrieval scheduling in multi-shuttle automated storage/retrieval systems (AS/RSs) under shared storage, in which the reuse of empty location yielded by retrieval operation is allowed. From the view of analytical model, the advantage of operational mode under shared storage is verified. A variable neighborhood search (VNS) algorithm is developed to solve the large-sized problems. Various numerical experiments are conducted to evaluate the performance of the proposed algorithm and investigate the impact of different parameters on computational efficiency.     

Modeling the mixed storage strategy for quay crane double cycling in container terminals

A mixed storage strategy was proposed to improve the efficiency of yard operations and horizontal transportation to corporate with quay crane double cycling. The effects of the mixed storage strategy on terminal operations, including truck travel distance, yard crane operations and the number of required trucks, were analyzed. An approach based on cycle-time models, the queuing theory was proposed to evaluate the performances from long-term run. Results show using the mixed storage strategy, the truck travel distance can be decreased and the number of required trucks and yard crane’s operation time can be reduced by 16% and 26% respectively.     

Design of an ice thermal energy storage system for a building of hospitality operation

Large chunk of cooling load is typically demanded during hospitality operation. In the pursuit of reducing its energy cost, a multi-functional commercial building incorporates ice thermal energy storage (TES) concept for storing harvested ice at off-peak hours and thawing the storage medium at peak hours. Ice built during off-peak hours is used to relief the cooling burden of hospitality operation at peak hours. The refrigeration cycle of water chilling would operate under two modes, the ice mode for thermal storage, and the chill water mode for instantaneous air cooling. The TES design uses a partial storage approach to satisfy off-peak hour cooling demands. Two screw chillers are integrated with each other for the implementation to allow feeding chill water to the air-handler coils while producing ice for storage at the same time. Not only does the TES system take advantage of the electric rate structure, super-cooled air also makes humidity levels to be lower than buildings with conventional cooling systems. Cool air is introduced to VAV (variable air volume) terminal boxes and is mixed with induced plenum air to bypass any reheat, yielding additional saving. The TES system saves electricity cost while providing thermal comfort to occupants. Indoor air quality may have been sacrificed when only 5 L/s per person of fresh ventilation is introduced into the building.