Attrition resistant catalyst for dimethyl ether synthesis in fluidized-bed reactor

Fluidized-bed reactor is a candidate for dimethyl ether （DME） synthesis from syngas because of its excellent heat removal capability. In order to improve the attrition resistance of catalyst, an amount of silica sol as binder was added to the catalyst composed of methanol synthesis component CuO/ZnO/Al2O3 and methanol dehydration component HZSM-5, which was prepared by coprecipitation and shaped by spray drying to get spherical particles. The effect of silica sol on the catalytic activity was investigated in a fixed-bed flow microreactor. Based on the experiment results, silica sol in the range of 0-20wt% had small effect on the catalytic activity. Generally, the CO conversion and DME yield decreased with the increase in concentration of silica sol, while the attrition resistance of catalysts increased with increasing silica sol, indicating that it was feasible to improve the attrition resistance without greatly sacrificing the activity of catalyst. In addition, the characterizations of catalysts were carried out using Brunauer-Emmett-Teller （BET）, X-ray powder diffraction （XRD） and temperature programmed reduction （TPR）.     

死亡背景下的斯芬克斯之思——福柯人学思想初探

福柯对人的思考是在死亡的背景下展开的,他继尼采的“上帝死了”之后进一步提出了“人的死亡”这一具有多重含义的判断;并在一系列的著作中对造成“人的死亡”的外在社会原因也即权力的具体内容与规律进行了分析与阐述;最后指出在权力的支配下,人的复活只能依靠随时随地的反抗。     

用Multisim实现负电阻的仿真和分析

负电阻不是实际存在的电路器件,但它可以通过其它的电路元件来实现。通过给出负电阻的实现方法,给出了运算放大器工作于线性区的条件。讨论了用Multisim实现负电阻的仿真和分析的方法,得出负电阻和负电阻的串并联连接以及负电阻和正电阻的串并联连接电路中,负电阻的处理方法与正电阻一致的结论。用Multisim实现负电阻的仿真和分析,作为一个电路的虚拟或仿真实验,可以为电路实验教学提供帮助。     

行政抵抗权之法理分析

目前众多国内外的学者纷纷进行对相对人的抵抗权的研究,我们国家相关法律也对此做了一些类似规定。但是,我国行政法对于相对方的抵抗权的规定一直处于"犹抱琵琶半遮面"的状况,只在为数不多的法律文件中做了规定,因此作者认为行政相对方抵抗权已经能够在我国法律体制中发现,但是需要对其进行系统分析研究。     

建筑抗震概念设计

本文从建筑的平立面布置、抗震结构体系、结构构件和非结构构件设计等方面阐述了建筑抗震概念设计的一般原则和规律     

Resistance in action learning: struggling with self-efficacy and the social Self – and what about the set advisor?

This account of practice explores the concept of resistance in action learning. Resistance is conceptualized as an attempt of self-protection that is manifested in action learners' struggles with their sense of self-efficacy and their social Self. These struggles are an inherent part of the action learning process and may elicit defensive undercurrents that constrain learning. I contribute to debates on criticality in action learning by recognizing the centrality of resistance as a source of learning for participants and set advisors. The intended contribution of this paper is to illuminate the importance of engaging with these limiting processes which can spark a powerful learning experience that reverberates long after the action learning programme has finished. Furthermore, I reflect on the opportunities this alternative view on resistance may provide for us as action learning facilitators and discuss how we may incorporate these reflections in our practice.     

青少年问题行为的文化解读

青少年问题行为在当今社会中已屡见不鲜。从文化的角度看,问题行为是青少年以自己特有的温和的抵抗仪式对父辈文化、权力阶层的反抗,但最终并未能改变他们在社会中不平等权力关系中的的总体格局。     

直流电阻电路分析方法的对比

对直流电阻电路解题方法进行分析和对比,指出每种方法的特点.对于不同的电路,提出了解题的最佳方案.     

铜热电阻温度计的设计与组装

本文介绍了利用铜电阻温度特性设计与组装铜电阻温度计的原理及方法,并对实验结果进行了分析讨论.这个实验题目在国内高校物理实验教学中具有创新性.     

论自主学习及能力培养

培养学生自主学习能力是开放教育教学的核心。切实转变教学观念,强化学生自主学习的意识和能力是前提;导学引学,教会方法是途径;启发自我教育是提高自主学习能力的关键。