利用光反射精确测量亚共析碳钢的含碳量

本文从光学角度出发提出了一种经济实用、精度高的测量亚共析碳钢中碳的含量的新方法。阐述了该方法的测量原理，即以金相试样表面对光的反射程度来判定其含碳量，并给出了有关经验公式及数据处理方法。     

含苯氧基萘并萘醌和偶氮苯双变色基化合物的合成和性质

通过６－氯－５，１２－萘并萘醌与４－羟基偶氮苯及其衍生物的反应合成了３种含苯氧基萘并萘醌和偶氮苯光致变色基的双变色基化合物，６－［４－（苯偶氮基）苯氧基］－５，１２－萘并萘醌（５），６－［４－（ｐ－乙氧基苯偶氮基）苯氧基］－５，１２－萘并萘醌（６）和６－［４－（ｐ－硝基苯偶氮基）苯氧基］－５，１２－萘并萘醌（７）．这些化合物的苯氧基萘并萘醌变色基的ＵＶ诱导光致变色性较弱；基于氨与苯氧基萘并萘醌ａｎａ显色体的不可逆反应，化合物５和６ＤＭＳＯ溶液在３６５ｎｍ紫外光辐照光稳态（ＰＳＳ）下的ａｎａ醌式摩尔分数估计分别为２２％和１７％．这些结果说明，苯偶氮基对苯氧基萘并萘醌变色基的光致变色性质有着极强的影响．另一方面，与４－羟基偶氮苯母体不同，这些双变色基化合物在ＤＭＳＯ中偶氮苯变色基的顺式异构体是相对稳定的     

基于无线传感器网络的飞行器测控通信系统测量方案设计

随着航天技术的发展,飞行器测控通信系统需要测量的参数种类和数量不断增加,但同时要求系统在进行方案搭建时满足更高的可靠性、更小的体积和更小的设备质量。为解决这类问题,提出了基于无线传感器网络的飞行器测量方案,方案重点从节点配置、时间同步、网络拓扑、能源供应等方面对方案进行阐述,最后给出了应解决的关键技术攻关方向。     

Parameter optimization and performance study of Ni–P coatings prepared by pulse-assisted jet electrochemical deposition

Journal of Solid State Electrochemistry - Jet electrochemical deposition is a relatively new technology for selective electrochemical deposition. Its advantages include high deposition accuracy and...     

多变量双曲方程组初值问题一类变系数差分格式的稳定性

熟知,P.D.Lax和H.O.Kreiss)对一类对称双曲方程组的“耗散型”差分格式的稳定性得到了比较完善的结果。但由于条件稍严,实际应用受到限制。朱幼兰等对一个空间变量情形,取消对称和耗散的限制,建立了较广的一类差分格式的稳定性判别准则,并对大部分常用格式给出了与常系数情形相当的稳定性条件。本文把[3]中这一主要结果推广     

The chemical bonding and spectral assignments of rhodium(III)‐catalyzed closo‐dodecaborate complexes: Ab initio study

The chemical bonding and spectral assignments of rhodium(III)‐catalyzed closo‐dodecaborate (RhCD) complex are systematically studied using the density functional theory calculations. It is found that the calculated main bond lengths of framework are in good agreement with experimental X‐ray observation, and the pronounced hybridization of B‐2p and Rh‐4d states is responsible for the structural stability, reflected by the large dissociation energy and HOMO–LUMO energy gap. The AdNDP chemical bonding analysis indicates that the RhCD complex can be stabilized by two H‐bridged 3c‐2e σ‐bonds (B‐H‐Rh triangles). Additionally, the theoretical calculations reproduce well the main experimental IR spectrum, and the characteristic peaks are properly assigned. These results will be helpful for further insight into the unique electronic structure of the species, and provide valuable references for potential applications in novel materials.     

Fabrication of monodisperse colloidal array with confinement effects

A monodisperse 1D colloidal array is prepared from monomer directly combining precipitation polymerization and confinement effects.     

Preparation and characterization of Cu2FeSnS4 thin films for solar cells via a co-electrodeposition method

Quaternary stannite semiconductor Cu₂FeSnS₄ (CFTS), which is an ideal material for solar photovoltaic cells, has attracted widespread attention. CFTS crystals have been successfully synthesized by the co-electrochemical deposition method. The structure, morphology, and composition of as-synthesized samples were characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), respectively. From the results, it was found that the properties of the sample can be improved by tuning the Cu²⁺ concentration in the electrolyte, and the best sample was obtained with the Cu²⁺ concentration of 0.01?M. For the best sample, the CFTS thin films have single phase and good crystallinity with even particle size. By the addition of ascorbic acid, an effective way has been found to enhance the Fe content in the sample, and the reason for the Fe-poor phenomenon has also been explored.     

利用正己烷制备负载型碳化钼催化剂及其加氢脱硫活性

 利用具有较长碳链的正己烷作为原料对氧化钼进行程序升温碳化制备碳化钼. X射线衍射、X射线光电子能谱表征和BET比表面积测定以及噻吩的加氢脱硫活性评价结果表明,正己烷作为碳化原料在600 ℃左右可对担载的氧化钼进行碳化,正己烷的使用不仅可以降低碳化所需的温度,还能在碳化过程中起到一定的改善碳化钼分散度的作用.     

H2FCS单分子分解反应的直接动力学研究

采用量子化学QCISD(T)/6-311++G(d,p)//B3LYP/6-311+G(d,p)方法研究了H2FCS单分子分解反应的微观动力学性质, 构建了反应势能剖面. 利用经典过渡态理论(TST)与变分过渡态理论(CVT)并结合小曲率隧道效应模型(SCT), 分别计算了在200～3000 K温度范围内的速率常数kTST、kCVT和kCVT/SCT. 计算结果表明, H2FCS可经过不同的反应通道生成10种小分子产物, 脱H反应和HF消去反应为标题反应的主反应通道, 其中HF消去反应产物HCS可由两条反应通道生成. 在200~3000 K温度区间内得到三条反应通道的表观反应速率常数三参数表达式分别为 , 和 . 速率常数计算结果显示, 量子力学隧道效应在低温区间对反应速率常数的影响显著, 而变分效应在计算温度范围内可以忽略.