Effect of Ni addition on the glass-forming ability and soft-magnetic properties of FeNiBPNb metallic glasses

The effect of Ni addition on the glass-forming ability (GFA) and soft-magnetic properties of an (Fe1-xNix)75.5B14.5P7Nb3 (x=0-0.6) alloy system were investigated. We found that the addition of Ni was effective in allowing the alloy to approach a eutectic point as well as increasing the thermal stability of the supercooled liquid. By increasing the amount of Ni,the supercooled liquid region (ΔTx),the reduced glass transition temperature Trg (Tg/Tl) and the Y parameter [Tx/(Tg+Tl)] increased from 49 to 75 K,0...     

基于结构化模型驱动的稳控装置动作模拟仿真方法

提出了一种基于结构化模型驱动的稳控装置动作模拟仿真方法.通过对稳控装置模型的结构化,将其稳控策略组织为四元表形式(即故障、运行方式、潮流水平和控制策略),并将其控制策略分解为控制方式、控制量、控制量实施原则、控制对象队列和约束5个基本元素,在此基础上归纳出直接型、顺序型、循环型和最优型四种基本的控制策略结构化模型.进一...     

山西省山区型农村发展特征及建设重点分析——基于临汾市63个村的调查

由于我国是一个多山的国家,山地面积占到总土地面积的2/3,并且大部分贫困地区主要分布在广大的山区,山区农村在发展的过程中又存在很多特殊的问题.认识与分析山区农村发展现状特征和建设重点,对指导新农村建设有重要的现实意义.本文以临汾市新农村建设领导办公室对全市63个山区农村的发展现状调查的原始数据与资料为基础,通过统计分析、文献分析法和个案研究的方法,分析总结出山区农村发展的现状特征、新农村建设中急需解决的问题,并据此给出一些山区农村发展的建议、发展的建设重点及其思路.主要结论是,当前山区农村发展的重点应该放在经济建设方面,不断帮助农民开拓增收渠道,围绕农民增收提供相应的农村公共产品,如搞好公路、水利、通信等基础设施建设.     

±660kV直流输电示范工程铁塔组立施工工艺

本工艺主要内容包括:基本规定、施工准备、组塔方式及工艺等。其中,组塔方式包括内悬浮外拉线抱杆分解组塔、内悬浮内拉线抱杆分解组塔等。山西省送变电工程公司宁东—山东±660 kV直流输电示范工程施工中运用本铁塔组立施工工艺,安全高效地完成了工程施工任务,现以宁东—山东±660 kV直流输电示范工程为例将该施工工艺作了系统的介绍,以提高铁塔组立施工技术水平和施工质量。     

Investigation of silicon on insulator fabricated by two-step O+ implantation

In this paper, we investigated the dose window of forming a continuous buried oxide (BOX) layer by single implantation at the implantation energy of 200 keV. Then, an improved two-step implantation process with second implantation dose of 3×10¹⁵ cm^?2 was developed to fabricate high quality separation by implanted oxygen (SIMOX) silicon on insulator (SOI) wafers. Compared with traditional single implantation, the implantation dose is reduced by 18.2%. In addition, the thickness and uniformity of the BOX layers were evaluated by spectroscopic ellipsometry. Defect-free top Si as well as atomic-scale sharp top Si/buried oxide interfaces were observed by transmission electron microscopy, indicating a high crystal quality and a perfect structure of the SOI fabricated by two step implantation. The top Si/BOX interface morphology of the SOI wafers fabricated by single or two-step implantation was also investigated by atomic force microscopy.     

Simulation of sea surface temperature changes in the Middle Pliocene warm period and comparison with reconstructions

The Middle Pliocene (ca 3.12–2.97 Ma) is a recent warm period in the Earth’s history. In many respects, the warmth of the Middle Pliocene is similar to the probable warm situation of the late 21st century predicted by climate models. Understanding the Middle Pliocene climate is important in predicting the future climate with global warming. Here, we used the latest reconstructions for the Middle Pliocene—Pliocene Research Interpretation and Synoptic Mapping (PRISM) version 3—to simulate the Middle Pliocene ...     

河南省畜牧业竞争力时空差异分析

畜牧业竞争力是一个地区畜牧业发展水平的综合体现,以河南省为例,运用主成分分析和聚类分析的方法,选取综合反映畜牧业综合竞争力水平的38个指标,通过分类对比对河南省18个省辖市的畜牧业竞争力进行了分析.从18省辖市畜牧业竞争力得分排名,可以看出从1999年到2008年18个省辖市畜牧业竞争力的动态变化特征,并可分为几种区域...     

平遥县水土保持现状与对策探讨

文章结合平遥县水保治理及淤地坝建设现状,分析了淤地坝建设的目的、意义及规划,从强化前期工作、规范施工及管护机制等方面提出对策建议.     

改革开放初期中国学会的兴起

改革开放初期(1978-1989)学会出现了创建高潮。科技经济体制的改变、新科技革命的到来、科技人员政治思想的解放、中国国际交往的需要等要素推动了学会的创兴,而科技共同体中科技精英的自主性要求,以及当时学会办事机构作为行政或事业编制的体制都在不同程度上助推了全国学会的成立与发展。全国学会的创兴及其动机反映了中国当代科技发展与政治、经济、教育、文化之间的互动关系。     

建造合同预计损失准备的转回和转销

文章论述了建造合同完成前,在已计提了预计合同损失准备的情况下,对因完工百分比增加造成的预计损失准备变动额应采取的会计处理方式。