碳纳米管粉末微电极对NO2-的催化还原

采用粉末微电极来研究修饰和未修饰的碳纳米管电极的电化学特性 ,结果显示经阳极极化的碳纳米管比未极化的碳纳米管具有明显的催化效果 .TEM和SEM显示阳极极化能有效切断碳纳米管成长度更短 ,管口更多的碎片 .同时其电化学表面积和吸附中继体Os(bpy) 2 + 3的量增加 ,从而导致其在酸性溶液中对NO- 2 具有较高的催化活性     

Application of multi-criteria decision making methods for selection of micro-EDM process parameters

Ti-6A1-4V super alloy is an important engi- neering material with good strength to weight ratio and a wide range of applications in a number of engineering fields because of its excellent physical and mechanical properties. This work determines optimum process parameters such as pulse on time, peak current, gap voltage and flushing pressure, which influence the micro-electro discharge machining （EDM） process during machining of Ti-6AI-4V using combined methods of response surface methodology （RSM） and fuzzy-technique for order pref- erence by similarity to ideal solution （TOPSIS）. Central composite design （CCD） is used in the experimental investigation. A decision making model is developed to identify the optimum process parameters in the micro- EDM process, which influences several machining criteri- ons such as material removal rate （MRR）, tool wear rate （TWR）, overcut （OC） and taper. Triangular fuzzy numbers are used to determine the weighting factor for each process criterion. Further a fuzzy-TOPSIS method is used to select the most desirable factor level combinations. The proposed technique can be used to select optimal process parameters from various sets of combinations of process parameters in a micro-EDM process.     

浅淡少儿跳远助跑的训练

跳远训练,特别是少儿的启蒙训练,助跑是一个关键性的问题,助跑节奏稳定、助跑步点准确,自然踏跳就准确,就能充分发挥运动员的潜能,达到训练的最佳效果．从影响跳远助跑准确性的因素到培养跳远助跑的训练方法及跳远助跑训练注意事项,提出了多方面的想法．     

浅谈篮球教练员临场指挥的策略

当今，篮球运动跨入了一个崭新的发展阶段，篮球比赛的争夺显得更加激烈．一个球队比赛胜败因素中教练员的临场指挥就是其中一个重要因素．教练员在临场想取得比赛的主动，必须充分利用篮球运动规则，分别在比赛前、开局时、半场结束前、中场休息时、下半时、暂停与换人和相持期间等重要时刻做好指挥工作，以争取比赛的最后胜利．     

化学新课程教学中的困惑及初步解决方法

在化学新课程实施过程中，教师存在许多困惑，结合教学实例，简述了教学中几点困惑及初步的解决方法．     

Investigation on the application of reformed coke oven gas in direct reduction iron production with a mathematical model

To investigate the application of reformed coke oven gas （COG） in producing the direct reduction iron （DRI）, we simulated a countercurrent gas solid moving bed reactor in which the iron ore pellet was reduced by reformed COG. An ordinary differential equation （ODE） was set based on the unreacted shrinking core model considering both mass and energy balances of the reactor. The concentration and temperature profiles of all species within the reactor were obtained by solving the ODE sys tem. The solid conversion and gas utilization were studied by changing gas flow rate, solid flow rate, reactor length, and the ratio of O/CHa to guide the practical application of COG in DRI production. Model results showed that COG was suitable for the DRI production. In order to meet the requirement of the industrial production, the minimum gas flow rate was set as 130,000 Nm3/h, and the maximum production was 90 t/h. The reactor length and the mole ratio x（O）： x（CH4） were depended on the actual industrial situations.     

从控制论角度探讨体育教学中学生主体地位的发挥

运用控制论的理论和观点,从教师和学生两个角度对学生主体地位的实现问题进行客观的有益的探讨．研究表明,在体育教学过程中要充分发挥教师主导作用和学生主体作用的协调与统一．     

Bilateral teleoperation with reducing wave-based reflections

This paper presents a wave-based bilateral teleoperation structure to reduce the wave reflection and enhance the force and speed tracking performance through adjusting the relative parameters. A time domain passive approach is also applied to deal with the passivity of whole system even with non passive environment. The efficiency of the proposed method is confirmed by some experimental results.     

中学生物探究活动的制约因素及对策

从新课程标准对中学生物探究活动的要求出发，探讨中学生物探究活动的制约因素，提出相应的解决方案，为有效开展探究活动提供对策．     

物理课堂教学创建自主探究环境的实践与思考

根据中学物理教学实践，从突出学生的主体作用和发挥教师的主导作用两方面，分析探讨创建自主探究教学环境的方法．     

民族经济学是人本经济学——评刘永佶主编《民族经济学》

中央民族大学刘永佶教授主编的《民族经济学》作为“985工程”中国民族地区经济社会发展与公共管理哲学社会科学创新基地学术出版物2007年9月由中国经济出版社出版。全书共12章38万字。通观全书,有一条红线贯穿始终。这就是以人为本的经济学理念和否定物本经济学的学术勇气。该书对于正确把握人与人、人与社会、人与自然的三大关系或三大矛盾,具有重要的理论意义和学术价值。     

多媒体在数学建模教学中的辅助作用

鉴于目前学生把所学的数学知识应用于实际的能力欠缺的状况,中学数学应重视数学建模教学．多媒体技术在数学建模教学中有很强的辅助作用．     

计算机辅助教学在生物教学中的有效应用

多媒体计算机辅助教学正逐渐成为中学生物学教师必须掌握的现代教学手段．有效地应用多媒体技术辅助生物教学,必须从生物教学的实际出发,充分发挥多媒体手段的优越性,并注重与传统教学手段的优势互补,交互使用,从而实现教学效果最优化．     

高中数学“再创造”教学模式的探讨

数学新课程强调数学教学方法的核心是学生的“再创造”．根据数学新课程特点，实施数学“再创造”教学模式，可提高学生的创新意识和实践能力，促使学生掌握最佳学习方法．     

中学生物教学合理运用多媒体技术的探讨

如何充分发挥多媒体辅助教学的优势，将多媒体技术合理运用于中学生物教学，以取得最佳教学效果，是值得深入探讨的课题．在农村中学高中生物学教学过程中，对新授课、复习课以及实验课等3种课型教学进行了对照试验，认为对抽象知识教学及系统复习课运用多媒体手段效果较佳，但多媒体课件演示不能替代学生实验操作技能的训练．     

Local synthesis of carbon nanotubes for direct integration in Si microsystems - design considerations

The integration of nanomaterials such as carbon nanotubes （CNTs） into microsystems is highly desirable, in order to make use of the unique nanomaterial properties in real devices. However, the CNTtomicrosystem integration is challenging to implement in a manufacturable, cost effective industrial process. This paper presents our work towards a process for making complete, integrated CMOS / MEMS systems with integrated CNT. We demonstrate the feasibility of the process, using roomtemperature process ing, lowcost equipment and consumables, and electrical control with automation possibilities. CNTs are directly integrated at the desired positions in the Si microsystem, forming closed Si / CNT / Si circuits. We explore different designs with the aim to obtain uniform and welldefined CNT synthesis conditions, and show that simplified designs can perform comparably to more complex ones. The Si / CNT / Si circuits obtained can show rectifying （Schottky like） or nearohmic behavior. Gas sensing possibilities are demonstrated, indicating the possibility of monitoring aging/ fermenting of food. Functionalization of CNTs is demon strated, using thermal evaporation of Sn and Pd, opening for selective and sensitive sensors for various gases and ana lytes. Detailed microscopic characterization of the obtained CNTs are presented.     

Simultaneous optimization of multiple performance characteristics in WEDM for machining ZC63/SiCp MMC

Abstract The compliance of an integrated approach, principal component analysis （PCA）, coupled with Tagu chi＇s robust theory for simultaneous optimization of cor related multiple responses of wire electrical discharge machining （WEDM） process for machining SiCp rein forced ZC63 metal matrix composites （MMCs） is investi gated in this work. The WEDM is proven better for its efficiency to machine MMCs among others, while the particulate size and volume percentage of SiCp with the composite are the utmost important factors. These improve the mechanical properties enormously, however reduce the machining performance. Hence the WEDM experiments are conducted by varying the particulate size, volume fraction, pulseon time, pulseoff time and wire tension. In the view of quality cut, the most important performance indicators of WEDM as surface roughness （Ra）, metal removal rate （MRR）, wire wear ratio （WWR）, kerf （Kw） and white layer thickness （WLT） are measured as respon ses. PCA is used as multiresponse optimization technique to derive the composite principal component （CPC） which acts as the overall quality index in the process. Consequently, Taguchi＇s S/N ratio analysis is applied to optimize the CPC. The derived optimal process responses are confirmed by the experimental validation tests results. The analysis of vari ance is conducted to find the effects of choosing process variables on the overall quality of the machined component.The practical possibility of the derived optimal process conditions is also presented using SEM.     

诗意表达的魅力与深意——读宋生贵教授《诗性之魅：艺术美学新论》

我们这个时代似乎是“诗意”最多的时代。所有影视广告和报纸杂志都在不遗余力地鼓吹着“诗意地生活”。然而,我们的时代也许恰恰又是最缺乏诗意的时代。在这样的时代,彰显真正的诗意不但需要独到的眼光,也是需要有学术良知和勇气的,因为它也很可能被人指责为矫揉造作与不合时宜。     

Current status,enablers ＆ barriers of implementing cellular manufacturing system in Indian industries

The cellular manufacturing （CM） has been proved as a well-known manufacturing strategy that helps to improve manufacturing efficiency and productivity by utilizing the philosophy of group technology. Large num- ber of papers has been published in the area of design issues of CM system. Unfortunately, the issues related to acceptability of CM in Indian industries are typically not examined rigorously as technical issues. This paper pre- sents the results of a survey carded out to find the status, enabler and barrier of implementing CM system in Indian industries.