ZrO2颗粒对Si3N4/SiO2陶瓷复合材料性能的影响

通过加入ZrO2颗粒作为增强相,利用ZrO2的相变微裂纹增韧来改善Si2M4/SiO2陶瓷材料的力学性能.当ZrO2含量为15%时,材料的抗弯强度最高,达194.8 MPa.     

因势利导 疏管结合——淄博市“美食街”地段影响流动商贩分布的因素研究

该文从实地调查淄博市“美食街”地段中的流动商贩入手,对流动商贩的经营商品和辅助工具的种类、地段中的用地性质、消费者购买路线、地段中的道路宽度四个影响流动商贩分布的因素进行了研究和分析,从而寻找和总结出流动商贩存在的必要性以及其在哪些层面影响了我们的城市,以便对流动商贩提出合理的规划布局原则和人性化的管理建议。     

基于战略的企业项目组合设计与管理

在知识经济飞速发展的今天,创新将逐渐成为整个社会创造财富的主要方式。随着企业创新数量的增加,企业必须对各种创新采用基于战略的项目组合管理方法,从企业战略的角度对备选项目进行选择,并对多个项目进行组合管理。在这一过程中,企业应当综合地分析企业的战略发展需要与企业能力,包括资金能力、技术能力等,以企业长期价值最大化为目标对企业的项目组合进行设计,并制定计划,依靠主动出击来实现企业的项目组合管理。     

Substrate effect on in-plane dielectric and microwave properties of Ba(Sn0.15Ti0.85)O3 thin films

The microstructure and in-plane dielectric and microwave properties of Barium tin titanate Ba(Sn_0.15Ti_0.85)O₃ (BTS) thin films grown on (1 0 0) LaAlO₃ and (1 0 0) MgO single-crystal substrates through sol–gel process were investigated. X-ray diffraction and field emission scanning electron microscopy were used to characterize crystal structure of phases and microstructure of the thin films, respectively. Microwave properties of the films were measured from 1 to 10 GHz by the interdigital capacitor configuration. The obvious differences in the dielectric and microwave properties are attributed to the stress in the films, which result from the lattice mismatch and difference in the thermal expansion coefficients between the film and substrates. This work clearly reveals the highly promising potential of BTS films for application in tunable microwave devices.     

The preparation of graphene decorated with manganese dioxide nanoparticles by electrostatic adsorption for use in supercapacitors

Graphene decorated with manganese dioxide nanoparticles are prepared by electrostatic adsorption. The manganese dioxide is synthesized by a microemulsion route using the cationic surfactant hexadecyltrimethyl ammonium bromide, which dispersed in water is converted to be positively charged. The surface charge of graphene in water is negative, allowing two forms of manganese dioxide-decorated graphene to be synthesized by electrostatic adsorption: (a) free in situ synthesis and (b) layer-by-layer self-assembly. By electrochemical analysis, the specific capacitances of two materials are found to be about 40% and 250% larger than that of manganese dioxide. The improvement is because of the tighter contact between graphene and manganese dioxide, and the higher conductive and capacitive characteristics of graphene.     

N‐Doped Graphene‐SnO2 Sandwich Paper for High‐Performance Lithium‐Ion Batteries

A new facile route to fabricate N‐doped graphene‐SnO₂ sandwich papers is developed. The 7,7,8,8‐tetracyanoquinodimethane anion (TCNQ^?) plays a key role for the formation of such structures as it acts as both the nitrogen source and complexing agent. If used in lithium‐ion batteries (LIBs), the material exhibits a large capacity, high rate capability, and excellent cycling stability. The superior electrochemical performance of this novel material is the result from its unique features: excellent electronic conductivity related to the sandwich structure, short transportation length for both lithium ions and electrons, and elastomeric space to accommodate volume changes upon Li insertion/extraction.     

Random laser based on waveguided plasmonic gain channels

A waveguide-plasmonic scheme is constructed by coating the matrix of randomly distributed gold nanoisland structures with a layer of dye-doped polymer, which provides strong feedback or gain channels for the emission from the dye molecules and enables successful running of a random laser. Excellent overlap of the plasmonic resonance of the gold nanoislands with the photoluminescence spectrum of the dye molecules and the strong confinement mechanism provided by the active waveguide layer are the key essentials for the narrow-band and low-threshold operation of this random laser. This kind of feedback configuration potentially enables directional output from such random lasers. The flexible solution-processable fabrication of the plasmonic gold nanostructures not only enables easy realization of such a random laser but also provides mechanisms for the tuning and multicolor operation of the laser emission.     

10000m~3/h空分设备冷箱内管道焊缝开裂分析

由于安装人员将粗氩塔进液阀V3的固定支架和活动支架的位置装反,导致投运制氩系统时V3阀进口管线焊缝开裂,制氩系统不能成功投入运行。文章介绍了故障经过、原因分析过程和冷箱内损坏情况,最后阐述了冷箱内管道的优化措施和避免同类故障再次发生的防范措施。     

包裹红色料在无铅熔块釉中的发色研究

对国内外8种主要的包裹红色料,对比了它们在中低温无铅釉中的发色情况。结果表明：国产包裹红色料质量远高于国外同类产品;不同厂家的包裹红色料质量差异较大;基础釉组成和烧成温度对包裹红色料的发色影响最大。