PAN-based carbon fiber@SnO<Subscript>2</Subscript> for highly reversible structural lithium-ion battery anode

The carbon fiber (CF) is frequently preferred because it is considered as a multifunctional lightweight composite, where the CF is not only acted as one completely integrated part of the device with high-performance structural reinforcement, but also served as one of the battery electrode to storage energy. However, the limitation of electrochemical capacity of commercial CFs for the structural lithium-ion battery (SLIB) is an urgent issue should be solved. Therefore, in this work, a novel strategy to fabricate CF@SnO₂ composite is developed by employing one-step tin tetrachloride solvothermal method. The performance of the CFs could be improved by growing the stannic oxide firmly on each CF to form a synergetic electrode. When tested as anode materials, a high reversible capacity of 510 mAh g^?1 at a current density of 100 mAh g^?1 is maintained without obvious decay up to 150 cycles (a huge increase as high as 637.5% than that of the pure CFs). Furthermore, our strategy reveals an attainable route, which could be as a promising way to make a sustainable anode for SLIBs and carbon-based multi-functional composite for other practical applications.     

SOI新结构——SOI研究的新方向

SOI（silicon-on-insulator：绝缘体上单晶硅薄膜）技术已取得了突破性的进展，但一般SOI结构是以SiO2作为绝缘埋层，以硅作为顶层的半导体材料，这样导致了一些不利的影响，限制了其应用范围。为解决这些问题和满足一些特殊器件／电路的要求，探索研究新的SOI结构成为SOI研究领域新的热点。如SOIM，GPSOI，GeSiOI，SionAlN，SiCOI，GeSiOI，SSOI等。文章将结合作者的部分工作，报道SOI新结构研究的新动向及其应用。     

通信系统中Viterbi译码的Matlab仿真与实现

数字通信作为一种前向纠错编码技术卷积码起着重要的作用。相应地,信息接收端对卷积码的译码实现也提出了更高的要求。文中提出的卷积码译码Matlab仿真方案,旨在用Viterbi译码实现对卷积码译码的功能。仿真结果表明,维特比是一种良好的译码方式。     

The Explicit Expressions of Level-k Circulant Matrices of Type(n_1,n_2.…,n_k) and Their Some Properties

In this paper, we give the explicit expressions of level-k circulant matrices of type (n1,n2,…nk) and of order n1n2…nk,and the explicit expressions for the eigenvalues,the determinants and the inverse matrices of the kind level-k circulant matrices are derived,and it is also proved that the sort matrices are unitarily diagonalizable.     

如何保证县、乡级有线电视安全优质播出

总结县、乡级有线电视播出的实践经验，从设备选购、网络维护、节目审查、预防灾害等方面提出加强安全优质播出的具体措施。     

在PB中调用Delphi图像处理程序实现旋转打印

指出了PB本身不具备旋转打印功能的弱点 ,提出了借助具有图像处理功能的其它语言实现证件打印的旋转要求的设计思想。还给出了证件页格式分析 ,中间文件符号约定 ,以及Del phi智能旋打程序。     

关于r－循环矩阵的非异性

本文给出了仅用ｒ－循环矩阵的元素本身和参数ｒ便可做出判断其非异性的五种方法。     

The Explicit Expressions of Level- k(r1 ,r2 ,… ,rk) Circulant Matrices and Their Some Properties

§0.　IntroductionThecirculantmatricesareveryimportantandspecialmatrix.Duringmanylargecompu-tationproblemssuchassignaldealingandoilexploration,weoftenmeetwiththenumericalcomputationproblemsofthesortofsystem.Therefore,thestudiesofcirculantmatricesareno-ticedbymanymathematicsexperts.Consideringtheneedsofmanyrealisticcomputationproblems,itisgiventhatdefinitionoflevel-k(r1,r2,…,rk)circulantmatricesoftype(n1,n2,…,rk)in[1]andstudieditssomeproperties,theMoore-Penroseinverseandgeneralizedinverses.…     

Microstructure and high-temperature corrosion behaviors of aluminide coatings by low-temperature pack aluminizing process

Aluminide coatings were produced on carbon steel and Fe-5Cr-Mo alloy at a relatively lower temperature below 600 °C in shorter treatment time by a combination of surface refinement process and pack aluminizing process. Repetitive ball impact, generated by mechanical vibration, caused the top-layer refinement of substrates in a conventional pack aluminizing process. The effects of temperature and treatment time on the formation of aluminide coatings were analyzed. The microstructure of the coatings was investigated by SEM, AFM and XRD. The aluminide coatings were one-layer, compacted structure with ultrafine grains and uniform elemental distribution. High-temperature oxidation and sulphidation tests were carried out at 600 °C in air for 200 h and 10% SO₂ + Ar gas mixture atmosphere for 50 h, respectively. The mass gains and spallation indicated that the aluminide coatings significantly improved the high-temperature oxidation and sulphidation resistance.     

高压拉曼光谱方法研究卟啉J-聚集体

本文利用金刚石对顶砧(DAC)和拉曼光谱技术,测量了四苯基卟啉J聚集体在13GPa内的高压拉曼光谱,根据各个拉曼谱带的频移-压强变化曲线得出在13GPa内Tpp J聚集体无相变发生,并且高波数(1010～1600cm-1)和低波数(230～330cm-1)区的斜率要远大于中等波数(380～1000cm-1)区,这表明对应于高波数和低波数区的化学键比中等波数区更具有易压缩性,并对体积的减小起着重要的作用。根据苯环ψ3C-C面内伸缩振动模式强度逐渐增强的现象提出了分子弹簧垫圈模型。此外,这种分子弹簧垫圈的劲度系数可以通过中位取代基团调控。