不同压力下纳米 SnO_2材料的特性

用水热法制得了在室温大气环境下稳定的半导体 SnO_2纳米材料。用 X 射线粉晶衍射、透射电镜、高分辨电镜及 M(?)ssbauer 谱等研究了不同压力下的纳米 SnO_2的特性。随着压力增加,所有谱线都有明显展宽,其特性明显区别于一般的多晶 SnO_2。用残缺态的概念解释了实验结果。     

医用TiO2/SiO2薄膜表面共价键合肝素研究

以γ－氨丙基三乙氧基硅烷和戊二醛作为偶联剂研究了TiO2与SiO2-TiO2生物陶瓷膜表面固定肝素，利用红外光谱（FT－IR）和X光电子能谱（XPS）的测量结果表征薄膜表面肝素化前后的结构和组成：对接触角和体外血液相容性的研究表明，肝素化处理后，薄膜表面的亲水性和抗凝血性显著提高。     

MONTMORILLONITE SOLID ELECTROLYIES CONDUCTED BY HIGH-VALENCE CATIONS AND THEIR APPLICATIONS

本文描述了近年来我们对蒙脱石作为高价阳离子固体电解质研究的结果,从结构、电性和应用三个方面考察了蒙脱石固体电解质的特性及应用,结果表明,蒙脱石是一种有应用潜力的固体电解质。     

运用8D工作法降低柴油机曲轴油封故障率

8D工作方法以团队运作为导向,以事实为基础,避免个人的主见的介入,使问题的解决更具条理性和合理性.问题的解决,由公司各部门人员共同投入,求得创造性及永久性的解决方案.8D工作法的有效实施需依赖其它的质量工具,FMEA分析、鱼刺图、控制计划、试验设计(DOE)等.降低柴油机曲轴油封故障率是运用8D工作法的一个尝试,有效解决长期困恼的质量问题.     

Electrochemical performance of nickel oxide／KOH／active carbon super-capacitor

The fabrication and characterization of new type Nickel oxide/KOH/Active carbon super-capacitor have been described. Porous nickel oxide was prepared by hydrolysis of nickel acetate and heated in air at 300℃. The resulting nickel oxide behaved as an electrochemical capacitor electrode with a specific capacitance (50-70 F/g) superior to most active carbon electrodes. This kind of nickel oxide maintained high utilization at high rate of discharge (i.e., high power density) and had excellent cycle life more than 1 000 times,while the capacitance of the cell composed of two identical nickel oxide electrodes was poor at high discharge current density and the maximum operational voltage of this type capacitor was limited to 0.5 V. A new type super-capacitor was designed in which the nickel oxide and the active carbon were applied to the positive and negative electrodes respectively. The breakdown voltage of this type super-capacitor was improved effectively to 0.8 V and excellent characteristic of high power discharge was attained in this way. The Nickel oxide/KOH/Active carbon super-capacitor has promising potentials in portable telecommunications, uninterruptable power supplies and battery load leveling applications.     

Actionable Social Media Competitive Analytics For Understanding Customer Experiences

A large amount of user-generated content is now freely available on social media sites. To increase their competitive advantage, companies need to monitor and analyze not only the customer-generated content on their own social media sites, but also the content on their competitors’ social media sites. In this article, we describe a framework to integrate several techniques including quantitative analysis, text mining, and sentiment analysis for analyzing and comparing social media content from business competitors. Specifically, we conducted an in-depth case study which applies our developed framework to the analysis and comparison of social media content on the Facebook sites of the three largest drugstore chains in the United States: Walgreens, CVS, and Rite Aid. We found similarities and differences in the social media use among the three drugstore chains. We discuss the implications of our findings and provide recommendations to help companies develop their social media competitive analysis strategies.     

基于加权Karnik-Mendel算法的区间二型模糊逻辑系统降型

二型模糊逻辑系统是当前的学术研究的热点问题,而降型是该系统中非常重要的一个模块.Kamik-Mendel(KM)算法是被用来计算和完成区间二型模糊逻辑系统降型的标准算法.通过比较离散版本KM算法中求和运算和连续版本的KM(continuous version ofKM,CKM)算法中求积分运算,本文利用数值积分技术中牛顿-柯斯特求积公式将标准KM算法扩展成3种不同形式的加权KM(weighted KM,WKM)算法.而KM算法只是WKM算法中的一种特殊情况.3个计算机仿真例子用来阐述和分析WKM算法的表现,与传统的KM算法相比,WKM算法有较小的绝对误差和较快的收敛速度,给二型模糊逻辑系统设计者和应用者提供了潜在的应用价值.     

对香港的辐射应急计划的评论

本文评述了英国人尼尔·A和戴维斯·M为香港政府研究大亚湾核电厂环境问题提交的顾问报告书“应变计划”,讨论了适宜香港的应急防护措施、事故时的饮水问题和该报告书中对我国政府提出的要求。根据国际标准和香港及大亚湾核电厂的具体情况,本文强调香港毋需制定有关撤离、迁置和普遍发放碘片措施的应急计划,宜重视加强及时通报事故信息和应急监测能力;并建议对饮用水的应急防护问题作进一步的研究。     

Cybertwin中的格上生物特征认证密钥交换协议

针对基于Cybertwin的网络架构中通信双方存在信道安全以及隐私保护的问题,提出新的格上认证密钥交换协议。使用生物特征认证技术实现Cytertwin服务下的用户实名制登录和强身份认证需求,保证Cybertwin服务对用户网络行为的审计和追踪。通过引入通信方身份信息构造格上抗碰撞哈希函数,使身份信息在公共信道传输过程中能够应对量子威胁,同时满足用户匿名性和不可追踪性。最后基于RLWE问题设计了新的和解机制,通过两轮交互共享安全会话密钥。协议在BPR模型下满足理论可证明安全,具有抗量子攻击、抗临时秘密值泄露攻击、抗生物特征猜测攻击等安全特性。仿真实验表明该协议计算和通信开销适用于Cybertwin服务下数量庞大的终端互连需求。     

Study of Mn incorporation into SAPO framework: Synthesis, characterization and catalysis in chloromethane conversion to light olefins

MnAPSO-34 molecular sieve has been synthesized with triethylamine as the template, characterized with XRD, XRF, ³¹P, ²⁷Al and ²⁹Si NMR and FT-IR techniques and compared with SAPO-34. The template decomposition and removal have been investigated with TG–DTG–DSC coupled with mass spectrometer. Mn incorporation generates a negligible difference on the chemical shift in ³¹P and ²⁷Al MAS NMR, while an effect on the intensity of resonance peaks is revealed. ²⁹Si MAS NMR study has demonstrated that Mn incorporation favors the Si island formation, which may give rise to the stronger acidic sites. The thermal analysis (TG–DSC) on template removal in a diluted oxygen atmosphere, leading to the formation of CO₂, NO and H₂O, showed, besides a low temperature endothermic weight loss due to the desorption of water, two weight losses (200–400 and 400–600 °C) for SAPO-34 and MnAPSO-34, suggesting two different chemical location environments of template molecules in these two molecular sieves. The quantity of template removed at higher temperature range is much higher in MnAPSO-34, indicating stronger template–framework interaction and stronger acidity after calcination. The acid difference caused by Mn incorporation has also been evidenced by ammonia adsorption evaluated by FT-IR. Chloromethane transformation was carried out over MnAPSO-34 and SAPO-34 and the catalytic performance showed that both molecular sieves are very active and selective catalyst for light olefins production. MnAPSO-34 demonstrated higher activity and light olefins selectivity.