金枪鱼低温运输技术

本文介绍了金枪鱼低温(-55℃甚至更低)运输设备,并提出了低温运输设备通用技术要求.     

The super-connected property of recursive circulant graphs

In a graph G, a k-container C_k(u,v) is a set of k disjoint paths joining u and v. A k-container C_k(u,v) is k∗-container if every vertex of G is passed by some path in C_k(u,v). A graph G is k∗-connected if there exists a k∗-container between any two vertices. An m-regular graph G is super-connected if G is k∗-connected for any k with 1?k?m. In this paper, we prove that the recursive circulant graphs G(2^m,4), proposed by Park and Chwa [Theoret. Comput. Sci. 244 (2000) 35-62], are super-connected if and only if m≠2.     

Feasibility assessment of a container ship applying ammonia cracker-integrated solid oxide fuel cell technology

The maritime industry has entered its pathway of decarbonization. To achieve the IMO's ambitious goals of an absolute emissions reduction of 50% by 2050, and a 70% carbon intensity reduction by 2050 compared to the 2008 level, various options for the adoption of technologies and alternative fuels are considered by the market stakeholders.Ammonia, one of the most promising alternative marine fuels has long been considered to reduce carbon emissions. And solid oxide fuel cell is expected to transform ship propulsion technology in the future due to its high utilization of fuels. In this paper, a feasibility study is performed to assess the application of an ammonia cracker-integrated solid oxide fuel cell (hereafter as Ammonia SOFC) system on an ocean-going vessel through a detailed CAPEX, FuelEX, OPEX, Carbon tax, and carbon emission analysis. Comparison is made with direct ammonia, LNG and conventional fuels fired heat engines. The result concludes that it can be economically viable to apply to deep-sea shipping, compared to other marine fuels and propulsion technologies.     

Bayesian network construction from event log for lateness analysis in port logistics

The handling of containers in port logistics consists of several activities, such as discharging, loading, gate-in and gate-out, among others. These activities are carried out using various equipment including quay cranes, yard cranes, trucks, and other related machinery. The high inter-dependency among activities and equipment on various factors often puts successive activities off schedule in real-time, leading to undesirable activity down time and the delay of activities. A late container process, in other words, can negatively affect the scheduling of the following ones. The purpose of the study is to analyze the lateness probability using a Bayesian network by considering various factors in container handling. We propose a method to generate a Bayesian network from a process model which can be discovered from event logs in port information systems. In the network, we can infer the activities’ lateness probabilities and, sequentially, provide to port managers recommendations for improving existing activities.     

A parallel multi-population biased random-key genetic algorithm for a container loading problem

This paper presents a multi-population biased random-key genetic algorithm (BRKGA) for the single container loading problem (3D-CLP) where several rectangular boxes of different sizes are loaded into a single rectangular container. The approach uses a maximal-space representation to manage the free spaces in the container. The proposed algorithm hybridizes a novel placement procedure with a multi-population genetic algorithm based on random keys. The BRKGA is used to evolve the order in which the box types are loaded into the container and the corresponding type of layer used in the placement procedure. A heuristic is used to determine the maximal space where each box is placed. A novel procedure is developed for joining free spaces in the case where full support from below is required. The approach is extensively tested on the complete set of test problem instances of Bischoff and Ratcliff [1] and Davies and Bischoff [2] and is compared with 13 other approaches. The test set consists of 1500 instances from weakly to strongly heterogeneous cargo. The computational experiments demonstrate that not only the approach performs very well in all types of instance classes but also it obtains the best overall results when compared with other approaches published in the literature.     

LaNi5 hydride powder flowability as a function of activation and hydrogen content

Volume expansion of hydrogen absorbing materials, together with inter-particle friction can cause tension accumulation in hydride containers during absorption. When hydride particles absorb hydrogen there is an important volume increase, in the order of 25%. Particles have to accommodate to the container geometry but this movement is opposed by inter-particle friction. Under certain conditions tensions can build up, compromising the mechanical integrity of the container. This phenomenon needs to be addressed at the design stage to avoid mechanical failure of the container.Flow behavior of powder materials is a relevant technological field, usually addressed by means of qualitative or quantitative flowability measuring devices. The rotating drum technique, while mainly qualitative, is well established and can be modified into a completely sealed unit. To determine the flowability of a hydride under different activation stages and hydrogen content levels we developed a rotating drum device that can be pressurized with hydrogen or depressurized. We report particle size evolution and flowability measurements of a hydrogen absorbing material (LaNi₅) at different stages of activation for both absorbed and desorbed states. The results of the present study show that the flowability of LaNi₅ in more dependent on the degree of activation of the sample than on hydrogen absorption state.     

让历史重归城市——以哈尔滨花园街历史街区概念设计为例

哈尔滨花园街历史街区概念设计提出"容器"的概念,即把城市和街区比作不同层次的"容器",认为历史街区之所以没落是因为"容器"本身的破败和其功能不能满足现代需求,因此对"容器"本身及其内容进行更新是街区重新恢复活力的途径."容器"本身的更新包括对地面空间的保护、更新及对地下空间的开发、利用."容器"内容的更新包括功能置换和人口置换.     

含氧化锂易熔瓶罐玻璃配方的研究与应用

含氧化锂易熔瓶罐玻璃配方的研究与应用魏绍先，吕远怀，杨立臣（沈阳玻璃制瓶厂１１００２１）ＳｔｕｄｙｏｎＣｏｍｐｏｓｉｔｉｏｎｓｏｆＣｏｎｔａｉｎｅｒＧｌａｓｓｅｓＣｏｎｔａｉｎｉｎｇＬｉｔｈｉｕｍＯｘｉｄｅａｎｄＴｈｅｉｒＡｐｐｌｉｃａｔｉｏｎｓ￥Ｗ...     

New lead-acid battery for submersible vehicles

In this paper a new design of a container is detailed for sealed lead-acid battery operating overboard of a submersible vehicle in conditions of increased ambient pressure. Such a container is both a battery jar and a pressure compensator. It has been shown that a mandatory requirement for such container use is an application of a gelled-electrolyte. Authors have offered a two-stage technology of filling of accumulators without using vacuum pumping.     

容器形状对混凝效果的影响研究

影响混凝效果的因素有很多,文中利用正交实验方法研究了容器的形状对混凝效果的影响,在实验室环境下,通过确定圆形容器和方形容器的最优工况,比较了两种工况下的混凝效果。实验表明:容器形状影响整个混凝过程,尤其对混凝过程中二级搅拌转速影响最大,圆形容器二级搅拌转速较高为180 r/min,而方形容器在120 r/min的二级转速下效果最佳。