电解法处理利福霉素SV钠废渣分离液的研究

根据电化学原理，采用电解法，利用铁屑与炭粒作电极，处理利福霉素SV钠药渣分离液，讨论各种因素对分离液污染物作效果的影响，COD去除率可达91．8％左右，脱色率可达95％左右。     

组件技术在嵌入式系统中的应用

研究了提出了通用组件模型不能嵌入式系统中应用的本质原因,对嵌入式组件模型进行分类以及层次化分析. 并对于嵌入式系统的非功能属性进行分析,总结了常见嵌入式组件模型对这些非功能属性的支持情况. 然后介绍了组件库的设计,以及组件模型的未来研究方向.     

基于WIFI/GPRS的嵌入式Internet

针对物联网系统中移动硬件设备接入Internet困难的问题, 设计了一种将嵌入式软硬件技术和WIFI/GPRS无线通信技术相结合嵌入式Internet系统, 通过WIFI模块构建自组网络、通过GPRS模块实现sink节点入网和远距离数据传输。该系统解决了跨网络视频数据传输的问题, 同时也解决了无线专用网络投资大、维护困难的问题。     

Irganox HP-136的稳定机理及在PP稳定过程中的作用

Irganox HP-136（3-芳基-苯并呋喃酮）是一种高效的自由基捕捉剂,它能有效地捕获以碳为中心的自由基,许多实验表明它在聚合物稳定过程中起到了重要的作用.本文比较了Irganox HP-136与传统抗氧剂的抗氧机理,并分析了其在PP稳定过程中的作用.     

2,6-二异丙基环己胺馏分测定

建立了馏分中 2 ,6 二异丙基环己胺的气相色谱方法。在弱极性的毛细管色谱柱上、1 1 0℃下用面积归一法测定 ,方法标准偏差为 0 .1 3 ,变异系数为 0 .40 % ,与化学法比较 ,相对偏差小于 2 %。     

时间戳服务在信息系统审计的研究应用

联网审计后,审计的审计线索由原来纸质的资料转为为计算机的电子数据,电子数据存在被篡改或伪造的可能,不能确保其真实性和可靠性,本文研究的是在被审计单位原始数据生成时,采用时间戳服务对其实时签名,来保证电子数据的真实性和可靠性。     

A Normalization Method of Moment Invariants for 3D Objects on Different Manifolds

3D objects can be stored in computer of different describing ways, such as point set, polyline, polygonal surface and Euclidean distance map. Moment invariants of different orders may have the different magnitude. A method for normalizing moments of 3D objects is proposed, which can set the values of moments of different orders roughly in the same range and be applied to different 3D data formats universally. Then accurate computation of moments for several objects is presented and experiments show that this kind of normalization is very useful for moment invariants in 3D objects analysis and recognition.     

MATLAB/Simulink仿真技术在《弹药制导与控制技术》教学中的应用

为提高研究生课程教学质量,在《弹药制导与控制技术》教学中引入了MATLAB/Simulink仿真技术。以"自寻的制导引导方法"为例,分析了数学仿真模型,建立了Simulink仿真模型,并分析了仿真结果。应用表明,该仿真实验教学效果良好,解决了目前制导原理实验教学难以开展的问题,为该课程的教学提供了一种全新的途径和方法。     

Controllable Fabrication of Co3−xMnxO4 with Tunable External Co3+/Co2+ Ratio for Promoted Oxygen Reduction Reaction

Co_3?xMn_xO₄ is a bimetal oxide with excellent electrochemical activity in alkaline solution, has been regarded as a promising alternative in the field of ion-air batteries and proton exchange membrane fuel cell (PEMFC). Herein, we report a simple solvothermal-calcination method to fabricate Co_3?xMn_xO₄ with tunable external Co³⁺/Co²⁺ and Mn³⁺/Mn²⁺ ratio. The tunable ratio of element valence in the bimetal results in a higher exposure of active center for oxygen redox reaction (ORR), and thus lead to a better ORR activity, which was confirmed by X-ray photoelectron spectroscopy characterizations and electrochemical measurements. Specially, Co_1.8Mn_1.2O₄ with a Co³⁺/Co²⁺ ratio of 2.08 showed an overpotential of 0.37 V at benchmark ORR current density of 3 mA/cm² in 0.1 M KOH, which is lower than that of pure oxide (Mn₃O₄ 0.53 V and Co3O4 0.56 V). In addition, the as prepared Co_1.8Mn_1.2O₄ exhibited a positive half-wave potential (0.83 V vs RHE) due to their more active sites, promotes charge transfer, adsorption and desorption of oxygen species. This work provides a strategy for the design and fabrication of earth-abundant, low-cost electrocatalysts for PEMFC in practical applications.

Graphic Abstract

Co_3?xMn_xO₄ was fabricated by tuning external Co³⁺/Co²⁺ and Mn³⁺/Mn²⁺ ratio, and the activity initially shows a positive correlation with the ration of Co³⁺/Co²⁺ in Co_3?xMn_xO₄.

     

Preparation and characterization of a PMMA/Ce(OH)3, Pr2O3/graphite nanosheet composite

An easy process for the synthesis of poly(methyl methacrylate)/Ce(OH)₃, Pr₂O₃/graphite nanosheet (PMMA/Ce(OH)₃, Pr₂O₃/NanoG) composite was developed. Graphite nanosheets (NanoG) were prepared by treating the expanded graphite with sonication in aqueous alcohol solution. The PMMA/Ce(OH)₃, Pr₂O₃/NanoG composites were prepared via in situ polymerization of MMA monomer in the presence of graphite nanosheets and Ce(OH)₃, Pr₂O₃ through reverse micelle template, in which the methyl methacrylate was designated as the oily phase. The composites were then dispersed with chloroform and coated on glass slides to form films. Scanning and transmission electron microscopy were used to characterize the structure and dispersion of the graphite nanosheets and the composites. The results showed that the high-aspect-ratio structure of the nanosheets played an important role in forming a conducting network in the PMMA matrix. From thermogravimetric analysis, the introduction of graphite nanosheets and inorganic nanopartices exhibited a beneficial effect on the thermal stability of PMMA.