Ti811合金棒材的热稳定性能和蠕变性能

系统地研究了合金成分Ａｌ含量、拉应力和温度对Ｔｉ８１１合金棒材热稳定性能的影响，对合金的蠕变性能也进行了定性研究。结果表明：Ａｌ含量降低、应力和温度升高，则残余变形量增大；４２５℃／１００ｈ／４１０ＭＰａ热暴露，Ａｌ含量大于８（ｗｔ％）时，合金的热稳定性塑性急剧降低；不高于４７５℃暴露（０～４７５℃／１００ｈ／４１０ＭＰａ）以及４２５℃不同应力热暴露（０～４９０ＭＰａ／１００ｈ／４２５℃），合金具有较好的热稳定性。采用ＳＥＭ和ＴＥＭ技术分析了性能改变的原因。     

基于RFID的射频防伪系统

随着RFID标准日益完善,技术日趋成熟,成本也日渐降低,RFID应用不仅在国外,在国内也是被众多企业采用,但是这些应用主要集中在物流网络,其他领域的应用相对缺乏,而该文章就是基于深圳远望谷公司XCTF-3103型电子标签、XC2900手持式读写器和普印力SL4M打印机设计实现一个射频防伪系统.     

Solving inverse Sturm–Liouville problem with separated boundary conditions by using two different input data

In this study, we consider Sturm–Liouville (SL) equation under the separated boundary conditions on a finite interval. We get the approximate solutions of inverse SL problem by using different input data as eigenvalues and nodes (zeros of eigenfunctions), separately, and calculate the computed errors related to the obtained approximate solutions. To calculate the approximate solutions, we use Chebyshev interpolation technique by applying first kind of Chebyshev polynomials. Eventually, the numerical results are presented by providing some examples.     

Steelmaking technology for a sustainable society

For the reduction of CO₂ emission, two major developments are being conducted in COURSE50 (“ CO₂ Ultimate Reduction in the Steelmaking Process by Innovative Technologies for Cool Earth 50”). The one is separation of CO₂ gas from BFG (Blast Furnace Gas) and recharge of the rest of BFG including H₂ and CO into blast furnace. Hydrogen iron ore reduction technology is also going to be developed. The other one is amplification of H₂ gas from CH₄, for example, in COG (Coke Oven Gas). The produced hydrogen gas will be supplied to the society or the reformed COG will be charged to blast furnace. In addition to these drastic challenging technology developments, a variety of measures for CO₂ reduction is under taken. In the frame of Asia-Pacific Partnership on Clean Development and Climate, the best available technology for energy savings are discussed to be transferred within seven member nations, which has the effect of 1.27 million ton reduction of CO₂ emission a year. By supplying energy saving steel products to society such as high strength steels for automobiles and ships, which realizes the fuel consumption reduction, high performance electrical steels for motors and transformers, which realize electricity loss reduction, and by recycling waste city plastics and tires in steel processes for hydrogen gas generation, chemical raw material conversion and iron ore reduction, etc., it is expected that equivalent 10% reduction of CO₂ gas emission in steel production is counted. In steelmaking process the reduction of refining slags contributes materials use efficiency and less emission of unuseful byproducts. The control and utilization of nonmetallic inclusions, such as deoxidation products, are one of the key technology for obtaining product performance, which is required in the above-mentioned steel products. In order to optimize steelmaking process for these purposes, computational thermodynamics is applied. Optimization of demanganization, and control of chemical composition of nonmetallic inclusions by the use of computational thermodynamics are mentioned.     

Programmable Microfluidics Enabled by 3D Printed Bionic Janus Porous Matrics for Microfluidic Logic Chips

Numerous structures have been functionally optimized for directional liquid transport in nature. Inspired by lush trees’ xylem that enable liquid directional transportation from rhizomes to the tip of trees, a new kind of programmable microfluidic porous matrices using projection micro-stereolithography (PµSL) based 3D printing technique is fabricated. Structural matrices with internal superhydrophilicity and external hydrophobicity are assembled for ultra-fast liquid rising enabled by capillary force. Moreover, the unidirectional microfluidic performance of the bionic porous matrices can be theoretically optimized by adjusting its geometric parameters. Most significantly, the successive programmable flow of liquid in a preferred direction inside the bionic porous matrices with tailored wettability is achieved, validating by a precisely printed liquid displayer and a microfluidic logic chip. The programmable and functional microfluidic matrices promise applications of patterned liquid flow, displayer, logic chip, cell screening, gas–liquid separation, and so on.     

锂离子电池高镍三元正极材料LiNi0.8Co0.1Mn0.1O2研究进展

锂离子电池具有循环寿命高、无记忆效应等优点,?被广泛应用于电子消费产品及电动汽车等诸多领域.伴随着国内电动汽车的快速发展,?对锂离子电池的能量密度、安全性能、成本、热稳定性、循环寿命等提出了更高的要求.电池性能的提升取决于电极材料的改善,?而正极材料作为锂离子电池的核心组成部分,?将直接影响整个电池的性能.高镍三元正极...     

多应变率下Ti-811钛合金针状组织压缩变形及断裂机制

采用Instron力学试验机及分离式Hopkinson压杆系统,分别对Ti-811钛合金针状组织进行静、动态压缩实验,以研究其不同应变率下的变形及断裂机制。结果表明:随应变率升高,针状组织屈服强度依次呈现正-负-正的应变速率敏感性,其内在原因是位错滑移机制和孪生变形机制的相互竞争。针状组织在静态和动态加载下的断裂机制明显不同,分别呈现为双剪切及单剪切断裂模式。动态加载试样端面部位可形成连续锯齿形金属屑,这是由高速变形过程中主剪切带两侧金属的剧烈错动被入射杆与透射杆遏制所导致。     

基于压缩感知的矩阵型联合SAR成像与自聚焦算法

模型准确情况下,压缩感知在合成孔径雷达成像中得到良好应用;但在实际情况中,模型会存在一定误差,这些误差造成图像偏离真实位置、引起散焦降低成像质量.本文提出一种矩阵型联合CS-SAR成像与自聚焦算法,该算法在CS-SAR成像重构方法方面,基于光滑l₀范数方法提出了矩阵型正则化光滑l₀范数重构方法,该方法具有较强容错能力并能直接重构矩阵型信号,能克服现有联合CS-SAR成像与自聚焦算法在计算效率方面的缺陷.最后,通过仿真验证了所提算法的有效性.     

嵌入式USBHOST的设计及其在温室环境监测系统中的应用

本文提出了基于uClinux2．6．x、S3C44BOX和SL811HS的USB Host设计方案,并给出实现USBHost的详细步骤。而USBHOST在采集温室环境监测系统的记录信息的实际应用过程中,体现了很强的实用性和方便性,具有一定的推广价值。