Deposition of CoO onto MoO3/Al2O3 hydrodesulfurization catalysts by solvent assisted spreading

Solvent assisted spreading of CoO over monolayer MoO₃/Al₂O₃ catalysts has been studied. CoCO₃ · Co(OH)₂ and CoCO₃ reacted with MoO₃/Al₂O₃ in water slurries. CoO deposition over MoO₃/Al₂O₃ extrudates was followed by EPMA. In the set of eleven MoO₃/Al₂O₃ catalysts, the amount of CoO adsorbed was roughly proportional to the surface area of MoO₃ monolayer. The adsorbed Co species efficiently enhanced the HDS activity.     

加入纳米氮化硅对氮化硅陶瓷性能与结构影响

本文以亚微米级氮化硅为起始原料，加入纳米氮化硅来增强基体，添加氧化铝和氧化钇为烧结助剂，等静压成型，采用无压烧结的方式来制备具有优良性能的氮化硅陶瓷。主要研究了纳米氮化硅的分散；纳米氮化硅的加入量对氮化硅陶瓷力学性能的影响；纳米氮化硅的加入量对氮化硅陶瓷使用性能的影响；纳米氮化硅的加入量对氮化硅陶瓷显微结构的影响。研究结果表明：乙醇作为溶剂在分散介质为聚乙二醇的情况下，超声波震荡40分钟时，纳米氮化硅分散效果最好；随纳米氮化硅加入量的增加，显气孔率增加，吸水率增大；加入3wt％的纳米氮化硅时，试样的体积密度最大，抗弯强度、洛氏硬度、断裂韧性最好，具有较理想的显微结构。     

Al2O3-SiC-C质主铁沟浇注料的结合相研究

对高炉主出铁沟用Al2O3-SiC-C质浇注料的结合相变化进行了分析，其中涉及到溶胶结合、氮化硅铁为添加物形成的sialon结合、水泥形成的水硬性结合。溶胶结合强度主要来自于化学结合；而sialon结合、水泥结合的强度仍然来自少量水泥形成的水硬性凝固相的作用，因此对烘烤工艺、使用效果的影响不同。     

A usability evaluation of medical software at an expert conference setting

Introduction

A usability test was employed to evaluate two medical software applications at an expert conference setting. One software application is a medical diagnostic tool (electrocardiogram [ECG] viewer) and the other is a medical research tool (electrode misplacement simulator [EMS]). These novel applications have yet to be adopted by the healthcare domain, thus, (1) we wanted to determine the potential user acceptance of these applications and (2) we wanted to determine the feasibility of evaluating medical diagnostic and medical research software at a conference setting as opposed to the conventional laboratory setting.

Methods

The medical diagnostic tool (ECG viewer) was evaluated using seven delegates and the medical research tool (EMS) was evaluated using 17 delegates that were recruited at the 2010 International Conference on Computing in Cardiology. Each delegate/participant was required to use the software and undertake a set of predefined tasks during the session breaks at the conference. User interactions with the software were recorded using screen-recording software. The ‘think-aloud’ protocol was also used to elicit verbal feedback from the participants whilst they attempted the pre-defined tasks. Before and after each session, participants completed a pre-test and a post-test questionnaire respectively.

Results

The average duration of a usability session at the conference was 34.69 min (SD = 10.28). However, taking into account that 10 min was dedicated to the pre-test and post-test questionnaires, the average time dedication to user interaction of the medical software was 24.69 min (SD = 10.28). Given we have shown that usability data can be collected at conferences, this paper details the advantages of conference-based usability studies over the laboratory-based approach. For example, given delegates gather at one geographical location, a conference-based usability evaluation facilitates recruitment of a convenient sample of international subject experts. This would otherwise be very expensive to arrange. A conference-based approach also allows for data to be collected over a few days as opposed to months by avoiding administration duties normally involved in laboratory based approach, e.g. mailing invitation letters as part of a recruitment campaign.Following analysis of the user video recordings, 41 (previously unknown) use errors were identified in the advanced ECG viewer and 29 were identified in the EMS application. All use errors were given a consensus severity rating from two independent usability experts. Out of a rating scale of 4 (where 1 = cosmetic and 4 = critical), the average severity rating for the ECG viewer was 2.24 (SD = 1.09) and the average severity rating for the EMS application was 2.34 (SD = 0.97). We were also able to extract task completion rates and times from the video recordings to determine the effectiveness of the software applications. For example, six out of seven tasks were completed by all participants when using both applications. This statistic alone suggests both applications already have a high degree of usability. As well as extracting data from the video recordings, we were also able to extract data from the questionnaires. Using a semantic differential scale (where 1 = poor and 5 = excellent), delegates highly rated the ‘responsiveness’, ‘usefulness’, ‘learnability’ and the ‘look and feel’ of both applications.

Conclusion

This study has shown the potential user acceptance and user-friendliness of the novel EMS and the ECG viewer applications within the healthcare domain. It has also shown that both medical diagnostic software and medical research software can be evaluated for their usability at an expert conference setting. The primary advantage of a conference-based usability evaluation over a laboratory-based evaluation is the high concentration of experts at one location, which is convenient, less time consuming and less expensive.     

基于XC2287M的工程机械ECU设计

ECU是工程机械电控系统的核心部件,目前国内中高端ECU市场基本被国外厂商所垄断。设计了一款基于XC2287M微控制器的工程机械智能ECU,采用CODESYS软PLC作为编程平台,支持IEC 61131-3定义的5种标准PLC语言进行编程。所设计的ECU拥有丰富的I/O资源和完善的安全保护机制,能够广泛应用于各种工程机械控制系统,打破国外厂商对ECU市场的垄断。     

Android平台i-Jetty服务器在智能家居中的应用研究

针对智能家居系统架构复杂、开发难度较大等问题,提出了一种基于Android平台嵌入式Web服务器i-Jetty的智能家居系统方案。在ARM硬件平台及Android软件平台上,采用i-Jetty服务器实现了家居环境信息网络远程监控功能。系统以Mini6410开发板为中央控制器、服务器和室内监控平台,采用蓝牙与被控设备进行通信,通过Linux层驱动加载、Android本地服务和Web服务的联合编程,实现对传感器数据的获取、家电控制和信息发布。实验结果证明了方案的可行性和实用性。     

Glass powders and reactive silicone binder: Interactions and application to additive manufacturing of bioactive glass-ceramic scaffolds

A novel concept for the additive manufacturing of three-dimensional glass-ceramic scaffolds, to be used for tissue engineering applications, was based on fine glass powders mixed with a reactive binder, in the form of a commercial silicone. The powders consisted of ‘silica-defective glass’ specifically designed to react, upon firing in air, with the amorphous silica yielded by the binder. By silica incorporation, the glass was intended to reach the composition of an already known CaONa₂OB₂O₃SiO₂ system. Silica from the binder provided up to 15 wt% of the total silica. With the same overall formulation, silicone-glass powder mixtures led to nearly the same phase assemblage formed by the reference system, crystallizing into wollastonite (CaSiO₃) and Ca-borate (CaB₂O₄). Samples from silicone-glass powder mixtures exhibited an excellent shape retention after firing, which was later exploited in highly porous reticulated scaffolds, obtained by means of direct ink writing (DIW).     

新烟碱类农药中间体乙酰基恶二嗪的合成

对农药重要中间体乙酰基-4-硝基亚氨基-1，3，5-恶二嗪的合成进行了研究，探讨了溶剂、时间、温度、物料配比等因素对反应收率的影响。最佳反应条件为1mol 4-硝基亚氨基-1，3，5-恶二嗪与1.2mol乙酰氯以DMF为溶剂、在5℃-10℃下反应10h。收率80％并得到了与文献报道理化性质完全不同的产物，结构经IR ^1HNMR和元素分析确证。     

Pr^3＋掺杂的TiO2纳米粉体的表面特性和光催化活性

利用酸催化的溶胶-凝胶法制备了纯的和不同Pr^3＋掺杂量的TiO2纳米粉体．以亚甲基蓝（MB）溶液的光催化降解为探针反应，评价了它们的光催化活性．利用XRD和BET技术研究了Pr^3＋掺杂量和焙烧温度对TiO2纳米粉体的相结构、晶粒尺寸和表面织构特性的影响，并用XPS和SPS技术研究了Pr^3＋掺杂的TiO2纳米粉体的表面组成和表面光伏特性，探讨了Pr^3＋掺杂提高纳米TiO2的光催化活性的机制．结果表明：适量Pr^3＋掺杂能显著提高纳米TiO2的光催化活性．当Pr^3＋掺杂量为1．25％（以Pr^3＋／TiO2质量比计），焙烧温度为600℃时，制得粉体的光催化活性最佳．Pr^3＋掺杂强烈地抑制TiO2由锐钛矿相向金红石相的转变，减小晶粒尺寸，增大比表面积，增加表面羟基和吸附氧的含量，提高光生电子和空穴的分离效率，改善粉体表面的光吸收性能，上述因素均有利于光催化活性的提高．     

The Roles of 3- and 4-Isopropylbiphenyls in the Isopropylation of Biphenyl over a H-Mordenite

The isopropylation of mixtures of 3- and 4-isopropylbiphenyls (3- and 4-IPBPs) was examined over a dealuminated H-mordenite (HM) to elucidate the role of 3- and 4-IPBPs in the isopropylation of biphenyl (BP). 4-IPBP was consumed much faster than 3-IPBP in all cases. 4-IPBP was an exclusive precursor to diisopropylbiphenyls (DIPBs), particularly 4,4-DIPB, and 4,4-DIPB was found in encapsulated products during the reaction. These results show that 4-IPBP can allow establishment of an active complex with propylene and acid site in HM pores, whereas 3-IPBP cannot. It is concluded that the isopropylation of BP over HM occurs through a reactant selectivity mechanism, and through a restricted transition state mechanism, but not through a product selectivity mechanism.