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关键词： 基础设施   工程管理   中国   一体化   分离   施工   设计   市场  

摘要： 近年来，我国基础设施建设领域完成了众多举世瞩目的工程项目，不断创造和见证着“中国速度”的奇迹。其中，电力建设行业也经历了崭新的发展历程，如三峡工程、特高压、百万千瓦火电机组等等，越来越多的电力企业掌握了先进的技术，具备了雄厚的实力，

关键词： Braise   Dissection   Grill   Ribeye   Roast   Skirt  

摘要： Beef nutrition is important to the worldwide beef industry. The objective of this study was to analyze proximate composition of eight beef rib and plate cuts to update the USDA National Nutrient Database for Standard Reference (SR). Furthermore, this study aimed to determine the influence of USDA Quality Grade on the separable components and proximate composition of the examined retail cuts. Carcasses (n = 72) representing a composite of Yield Grade, Quality Grade, gender and genetic type were identified from six regions across the U.S. Beef plates and ribs (IMPS #109 and 121C and D) were collected from the selected carcasses and shipped to three university meat laboratories for storage, retail fabrication, cooking, and dissection and analysis of proximate composition. These data provide updated information regarding the nutrient content of beef and emphasize the influence of common classification systems (Yield Grade and Quality Grade) on the separable components, cooking yield, and proximate composition of retail beef cuts. (c) 2013 Elsevier Ltd. All rights reserved.

关键词： Copper surface   Copper oxide surface   Nitric oxide dissociation   Density functional theory  

摘要： NO dissociation on Cu-based catalyst is investigated using density functional theory based calculations. NO dissociation on Cu-terminated Cu2O(111) surface is comparable with its dissociation on Rh(111) which is characterized by a transition state lying below the reference level (surface and NOgas). This finding is associated to the modified electronic and geometric structure of the surface Cu atoms in comparison to the Cu atoms of Cu(111). The local density of states profile of the d orbital of the Cu atoms in Cu2O(111) shows that the states are shifted to the Fermi level region which explains the good adsorption and easy dissociation of NO. In Cu(111), the dissociation is accompanied by a large amount of activation barrier and NO desorption is more likely to happen. Coadsorbed N and O atoms are unstable on O-terminated Cu2O(111) and is due to the repulsive effect of the surface and subsurface O atoms. This work is made through the initiative of the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of the Japanese government through the Elements Science and Technology Project and is a collaboration among various research groups to realize functional materials that are free from precious and hazardous substances.

关键词： 生化分离工程   现状   新思路  

摘要： 生物分离工程作为生物工程专业最重要的专业课之一,随着相关科研的飞速发展,课程内容不断的推陈出新,应用范围不断向外拓展。本文就其近年来的发展和现状进行了客观的分析;并针对高年级专业课教学中面临的教学与就业的尴尬问题提出了新的改革思路。

关键词： 膜分离技术   环境工程   技术应用  

摘要： 随着高新科学技术的发展,膜分离技术也在近年得到了迅猛的发展。膜分离技术具有低能高效、工艺精简、生产过程无污染、无化学变化等特点,有效地区别与传统分离工艺。本文针对膜分离技术在环境工程中的应用进行阐述。

关键词： 农林高校   生物分离工程   教育   教学  

摘要： 农林高校在开设生物工程专业教学中有着独特的教学环境与优势。依托农林高校的大生物背景,利用优势资源,丰富教学内容并进行教学改革,探索适合农林高校生物分离工程课程教育教学的模式,以适应农林产业化发展的需要。

关键词： 制药分离工程   课程建设   本科  

摘要： 结合制药分离工程课程的内容和特点与相关课程建设的文献资料,从优化调整教学内容、改进教学方法两个方面探讨了提高制药分离工程课程教学质量的思路与方法。

关键词： 分离式   键盘   人机工程学  

摘要： 运用人机学原理,结合手的解剖学特点、坐姿生理学等学科知识对键盘进行改进设计,对按键设计、形态颜色、手枕和键盘的总体布局都进行了重新设计,提出了分离式键盘的设计方案。

关键词： 化工分离工程   教学改革   应用型  

摘要： 根据应用型化学工程与工艺专业特点以及现在用人单位对工科学生的基本要求,对化工分离工程课程教学过程中存在的不足进行了思考,并提出了教改建议。以培养应用型人才为目的,提高学生分析问题和解决问题的能力,着重从教学与专业实验相结合、教学与科研实验相结合以及教学与生产实习相结合三个方面进行改革。在与专业实验相结合方面,要精选实验项目,优化实验内容,并重视实验的每一环节;在与科研实验相结合方面,要适时引入最新的科研成果;在与生产实习相结合方面,要善于将仿真实验与生产实际相结合,同时要让学生在实习基地进行真实的生产,从而达到教学目标。

关键词： Phase transformation   Austenite   Atom probe tomography   Grain boundary segregation   Austenite reversion  

摘要： In an Fe-9 at.% Mn maraging alloy annealed at 450 degrees C reversed allotriomorphic austenite nanolayers appear on former Mn decorated lath martensite boundaries. The austenite films are 5-15 nm thick and form soft layers among the hard martensite crystals. We document the nanoscale segregation and associated martensite to austenite transformation mechanism using transmission electron microscopy and atom probe tomography. The phenomena are discussed in terms of the adsorption isotherm (interface segregation) in conjunction with classical heterogeneous nucleation theory (phase transformation) and a phase field model that predicts the kinetics of phase transformation at segregation decorated grain boundaries. The analysis shows that strong interface segregation of austenite stabilizing elements (here Mn) and the release of elastic stresses from the host martensite can generally promote phase transformation at martensite grain boundaries. The phenomenon enables the design of ductile and tough martensite. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.