浸没燃烧式汽化器的分析优化

文中介绍了LNG接收站的工艺流程,对接收站正在运行的开架式汽化器（ORV）和浸没燃烧式汽化器（SCV）的工作特点和使用环境进行分析比较,并在此基础上结合浸没燃烧式汽化器（SCV）结构特点,提出优化方案。     

改进铁路基层单位计量工作过程管理

铁路运输的快速发展,促使铁路计量工作必须与之相适应。叙述运输基层单位计量工作通过管理理念和工作方式的转变,适应和促进铁路运输安全生产的进一步发展,在新形势下充分体现计量工作的技术保障作用。     

基于连续振动压实度值的土石混填路基压实质量评价研究

利用振动型压实设备和混填路基动态作用原理，得出基于连续振动压实度值的混填路基压实质量评价方案，分析压实次数与对应的回弹模量、孔隙率以及沉降率间相关性。研究表明:连续振动压实度值与3个主要指标间线性相关性明显；连续振动压实度值评价方案有着离散程度低的优势，能更好地评价混填路基压实质量。     

目数对橡胶沥青混合料路用性能的影响研究

本文为探讨不同目数对橡胶沥青混合料路用性能的影响,并对目数分别为20、30、40和60目的橡胶沥青混合料的路用性能进行对比分析。本文采用车辙试验、低温弯曲试验、冻融劈裂试验、浸水马歇尔试验和四点弯曲疲劳寿命试验,分析目数对橡胶沥青混合料路用性能的影响。研究表明:随着目数的增加,橡胶沥青混合料的路用性能都有一定的提高,综合分析路用性能和经济因素时,当胶粉目数为40目时,橡胶沥青混合料具有较好的路用性能。     

立足实际 主动作为——陕西省军区积极推动省军区部队军交运输工作科学发展

近年来，陕西省军区军交运输系统紧紧围绕省军区部队使命任务和遂行多样化军事任务需求，牢牢把握军交运输工作科学发展这一主题．立足实际，不等不靠，主动作为，着眼信息化条件下作战军交运输保障要求，加强军交运输基础设施建设和军交运输系统集成建设，务实推进军交运输保障力生成模式转变，不断提升军交运输综合保障能力，较好地完成了战备训练、重大任务和支援地方经济建设等各项军交运输保障任务。     

保险杠亚标准件特性的研究

通过对汽车保险杠的结构形式、性能特点和所用材料的分析,提出保险杠具有类似于标准件的特性这个新观点。提倡将保险杠的安全性能与装饰性能进行适当分割,加强保险杠的安全作用的比重,并使之成为可以独立发展的总成件,在此基础上组织专业化生产。     

Cooperative threat assessment of multi-aircrafts based on synthetic fuzzy cognitive map

Threat assessment is one of the most important parts of the tactical decisions, and it has a very important influence on task allocation. An application of fuzzy cognitive map (FCM) for target threat assessment in the air combat is introduced. Considering the fact that the aircrafts participated in the cooperation may not have the same threat assessment mechanism, two different FCM models are established. Using the method of combination, the model of cooperative threat assessment in air combat of multi-aircrafts is established. Simulation results show preliminarily that the method is reasonable and effective. Using FCM for threat assessment is feasible.     

基于模糊层次分析方法大型桥梁工程项目风险评估

大型桥梁工程规划、施工、运营期间面临众多不确定性因素影响,初步对工程项目进行风险识别,构建大型桥梁工程项目的风险评价指标体系,在传统层次分析法中引入模糊数学理论,建立了桥梁工程项目风险模糊层次分析模型,并将此模型在一座特大桥项目中运用,验证了这种风险评估方法的有效性和实用性。     

A new approach of intelligent design and optimization for shell nosing

Preform design for shell nosing product without machining the inner surface after forming is an experience-extensive work. Generally, the initial design needs to be modified and simulated consequently to get proper preform and nosing die, and the iterative process is time consuming. This paper puts forward a new approach, in which the suitable initial design can be obtained by knowledge-based intelligent technology and the optimal design can be acquired by finite element method (FEM) based geometrical modification. With the CAX object model as the bridge of CAD and CAE, the CAD model with simulation knowledge can be transferred into CAE automatically, and the CAE result can be automatically utilized as well. Based on the comparison between the simulated shape and the desired shape, the dissatisfactory area will be modified. A new simulation and modification process will be carried out based on the modified design. The process is repeated iteratively to get the optimal design. This approach utilizes the commercial CAD and CAE software, without the need of complex back-forward FEM procedures. Based on the new approach, an in-home intelligent shell nosing design and optimization system is developed, and a case study proves that this system can reach a reasonable design efficiently.     

Evolving mechanism of eutectic carbide in as-cast AISI M2 high-speed steel at elevated temperature

AbstractThe evolution in type,size and shape of carbides in as-cast American Iron and Steel Institute(AISI) M2 high-speed steel before and after annealing were investigated.The micromechanism which was responsible for those changes was also analyzed and discussed.At the initial stage of reheating,metastable M2C-type carbide decomposed continuously.M6C-type carbide nucleated at the interface of M2C/γfirstly and grow from surface to center.Then MC-type carbide nucleated at both surface of M6C/M6C and inner of M6C.With the increasing decomposition of the metastable M2C-type carbide,the rod-shaped construction of eutectic carbide began necking,fracturing and spheroidizing gradually.Held enough time or reheated at higher temperature,particle-shaped product aggregated and grew up apparently,while secondary carbide precipitated in cell and grew up less sig- nificantly than the former.Based on the above microstructural observation,the thermodynamic mechanism for decomposition of M2C carbide,for spheroidization of products,and for the growth of particles were analyzed.The rate equations of carbides evolution were derived,too.It shows that the evolving rate is controlled by diffusion coefficients of alloy atoms,morphology of eutectic carbides and heating temperature.