Epitaxial growth and thermal-conductivity limit of single-crystalline Bi2Se3/In2Se3 superlattices on mica

Nano Research - Thermal transport in superlattices is governed by various phonon-scattering processes. For extracting the phonon-scattering contribution of hetero-interfaces in chalcogenide...     

水电工程设计系统仿真探讨

阐述了水电工程设计系统仿真的主要内容,提出了以CATIA三维设计软件为中心的水电工程设计系统仿真路线,并结合工程实例,开展了三维设计、有限元计算、虚拟现实等设计仿真应用,实现了数据共享,提高了设计仿真的效率和质量,为水电工程开展全方位仿真模拟提供了新的思路。     

普定拱坝温度场反馈分析及开裂仿真

利用ANSYS软件及其二次开发技术,对普定碾压混凝土拱坝温度场进行了参数敏感性和仿真反馈分析研究.在此基础上,采用三维有限元法对该拱坝进行了全过程应力仿真计算.结合实测资料和计算结果,重点分析讨论了普定拱坝贯穿裂缝产生的可能原因,并针对碾压混凝土拱坝设计及施工提出了相关建议.以上研究提供了一种碾压混凝土拱坝温度场反馈分析及开裂仿真研究的初步思路,其分析结果对于类似工程具有一定的实际参考价值.     

喜河水电站建设期间的经济运行分析

介绍了喜河水电站建设期间的经济运行情况，通过对几种不同水调方式的分析、对比研究，提出了该水电站在建设期间应少弃水、多发电的经济运行方式。可指导有关水电站的实际运行。     

Refinement of packet size in low carbon bainitic steel by special thermo-mechanical control process

The packet size of bainitic steel can be refined by a special relaxation-precipitation-control phase transformation (RPC) technology, When processed by RPC process, the low carbon bainitic steel composes of two kinds of main intermediate transformation phases. One is ultra-fine lath-like bainitic ferrite and the lath is less than 1 tam in width and about 6 tam in length; the alignment of laths forms a refined packet, and the size of packets is about 5-7 ~am in length and about 3-4 tam in width, The other is acicular structure. The morphology and distribution of these acicular structures are influenced by relaxation process, the thin and short acicular structures cut the prior austenite grain and refine the bainitic packet size, For the optimum relaxation time, the packet size can be refined to the finest. The mechanical properties are influenced by relaxation time and the 800 MPa grade low carbon bainitic steel with excellent toughness can be obtained by RPC process,     

Microstructure evolution during reheating of a Nb-bearing steel I. Metallographic examination

Cooled in water after the isothermal relaxation of deformed austenite for different timea, a Nb-bearing microalloyed steel always exhibits synthetic microstructures of bainitic ferrite, granular bainite and acicular ferrite. When these samples were reheated to and held at 650 or 700℃, the non-equilibrious microstructures tend to evolve into equilibrious ones. The sample relaxed for 60 s displays the highest thermostability, while the microstructure evolution is the quickest in the sample relaxed for 1000 s even though it is the softest before reheating. Softening is not a single process occurring during reheating, in which the hardness fluctuates with time. There are two peaks in the hardness-time curve of each sample having undergone relaxation, while a single peak occurs in the curve of the sample having not been relaxed. Pre-strain accelerates the evolution process. These results indicate that the thermostability of microstructures is determined by their history of formation to a considerable degree.     

电—液量模拟的应用事例

本文根据液压系统与电气系统的工作原理和数学模型具有相似之处,说明了液压量模拟成电量的道理,从而使某些液压技术问题可借助于电学理论得到简化和理解。     

一种新型10 kV双环网结构

通过比对国内外配电网网架情况,提出一种新的10kV双环网结构,并应用在实际案例中,结果表明该结构在满足负荷、可靠性的要求下,能够有效降低线路半径、节约投资.     

小麦田杂草化学除草技术应用

近年来,随着小麦种植面积增加,麦农田杂草持续重发,对小麦产量构成了很大威胁。根据多年的化学除草经验,针对不同生长时期采用不同的化除方法,选用不同的药剂,能有效地控制草害的发生,值得借鉴和推广。     

关键钢铁材料的智慧研发路线

从面向2035的新材料强国战略出发,针对现代交通、能源、海洋工程以及重大装备等领域,对其急需的关键钢铁材料在品种、规格、性能、质量、服役安全与寿命等方面均提出了明确的发展目标、应攻克的技术瓶颈和"卡脖子"问题.为适应未来先进钢铁材料的发展,应在钢铁材料知识与理论框架下,充分发挥集成计算材料工程及材料信息学的优势,创建新材料的智慧研发路线,实现中国先进钢铁材料的研发从跟随模仿跨越到基于人工智能创新引领的新高地.