‘TONY SOPRANO ON MANAGEMENT’

This article develops the concept of ‘alternative cultural tourism’ through an in-depth study of the Prague Fringe Festival (PFF). In doing so, it argues that existing approaches to cultural tourism often fail to differentiate between different forms of culture (i.e. alternative versus mainstream), whilst also interrogating the criteria by which festivals can be understood as examples of alternative cultural tourism. Utilising a combination of both quantitative and qualitative data, involving audiences, festival performers and workers/volunteers, it is asserted that the PFF brings together a diverse mix of cultures, and seeks to create a more participatory and engaging tourist experience. Additionally, its more egalitarian organising structure produces different kinds of work and social relations in the production of art and culture – particularly between various groups working within the festival, but also in the creation of different ideas about audience engagement, performer relations, and engagement with the local community (through the idea of the ‘festival participant’). The article concludes by briefly exploring the potential of alternative cultural tourism to provide more meaningful and sustainable models of urban cultural development.     

Anomalous strain effect on the thermal conductivity of low-buckled two-dimensional silicene

The thermal conductivity of two-dimensional materials, such as graphene, typically decreases when tensile strain is applied, which softens their phonon modes. Here, we report an anomalous strain effect on the thermal conductivity of monolayer silicene, a representative low-buckled two-dimensional (LB-2D) material. ReaxFF-based molecular dynamics simulations are performed to show that biaxially stretched monolayer silicene exhibits a remarkable increase in thermal conductivity, by as much as 10 times the freestanding value, with increasing applied strain in the range of [0, 0.1], which is attributed to increased contributions from long-wavelength phonons. A further increase in strain in the range of [0.11, 0.18] results in a plateau of the thermal conductivity in an oscillatory manner, governed by a unique dynamic bonding behavior under extreme loading. This anomalous effect reveals new physical insights into the thermal properties of LB-2D materials and may provide some guidelines for designing heat management and energy conversion devices based on such materials.     

等电位联结的应用实施

探讨等电位联结实践中存在的问题，并就如何保证等电位联结的质量提出了一些看法和见解。     

Isolated Solid-State Packaging Technology of High-Temperature Pressure Sensor

Thehigh temperature pressuresensorhaswidespreadapplicationsinthefieldsofpetroleumlog ging,automonitor ,aerospace ,andsoon ,foritsfeaturesofhighworkingtemperature,smallbulkandhighsensi tivity ,whereaspackagingtechnologyisamainfactorwhichhaslimiteditsdevelopmentandapplicationforalongtime.Sensorpackagegenerallyadoptsnon isolatedpackageatpresent ,itisonlyapplicabletothatpressuremeasurementinwhichthegasorliquidiselectricalinsu latorandhasnocorrosiontothesensorchipandmetalelectrode ,andtherangeisalso…     

Teaching and learning the concept of chemical bonding

Chemical bonding is one of the key and basic concepts in chemistry. The learning of many of the concepts taught in chemistry, in both secondary schools as well as in the colleges, is dependent upon understanding fundamental ideas related to chemical bonding. Nevertheless, the concept is perceived by teachers, as well as by learners, as difficult, with teaching commonly leading to students developing misconceptions. Many of these misconceptions result from over‐simplified models used in text books, by the use of traditional pedagogy that presents a rather limited and sometimes incorrect picture of the issues related to chemical bonding and by assessments of students' achievement that influence the way the topic is taught. In addition, there are discrepancies between scientists regarding key definitions in the topic and the most appropriate models to teach it. In particular, teaching models that are intended to have transitional epistemological value in introducing abstract ideas are often instead understood by students as accounts of ontological reality. In this review paper we provide science educators, curricula developers and pre‐service and in‐service professional development providers an up‐to‐date picture regarding research and developments in teaching about chemical bonding. We review the external and internal variables that might lead to misconceptions and the problematic issue of using limited teaching/learning models. Finally, we review the approaches to teaching the concept that might overcome some of these misconceptions.     

有机分子组装体系的扫描隧道显微镜研究

利用长链烷烃取代基与石墨表面的较强相互作用,可以获得烷基取代的有机小分子(酞菁、卟啉、碱基)的高分辨STM图像。理论分析表明,这些分子的吸附稳定性来源于长链烷基与石墨间较强的范德华相互作用,以及长链烷烃链间的二维结晶能。分子在表面的吸附组装结构受到分子与基底间、吸附分子间,以及溶剂与分子间作用的共同影响。对于长链烷基取代的碱基分子在石墨表面的组装结构中,分子的排列方式不仅受到烷基链与石墨间较强的取向匹配的作用,碱基分子间形成的多个氢键以及芳环离域π键的作用也会影响分子的排列方式,并且是造成烷基取代碱基分子组装结构多样性的原因。扫描隧道谱研究表明,硫醇在Au表面的自组装分子膜对电流的整流作用,来自于分子中巯基与Au表面形成的双电层,而不对称取代的NtBuPc分子在石墨表面的LB膜的电流整流行为,来源于分子内部的不对称电子结构     

新企业生成过程中社会资本来源及转化路径研究

基于社会资本理论中的桥观点和结点观点,运用理论演绎方法,探讨了新企业生成过程中社会资本从何而来、以及创业者社会资本如何向企业社会资本转化的问题。研究发现,创业者社会资本是企业社会资本的最初来源;企业制度化和创业者能动性是新企业社会资本转化路径的重要影响因素,并据此将转化路径分为高效型、低效型、维持型和流失型四种类型。     

Reductive cyclodimerization of arylmethylidenemalononitriles promoted by samarium and catalytic amount of iodine: facile synthesis of cyclopentene derivatives

INTRODUCTION Carbon-carbon bond formation is the essence of organic synthesis and the reductive dimerization of carbonyl derivatives by means of active metals is one of the most valuable methods for establishing carbon-carbon bonds. The reported reductive cyclo- dimerization of a,b-unsaturated nitriles provides novel access to functionalized five-membered ring products (Fan and Zhang, 2001; Zhong and Zhang, 2000; Zhou and Zhang, 1997; 1998). The products of enamine comprise important s…     

Reductive cyclodimerization of arylmethylidenemalononitriles promoted by samarium and catalytic amount of iodine: facile synthesis of cyclopentene derivatives

Samarium and a catalytic amount of iodine were used to obtain functionalized cyclopentenes by reductive dimerization followed by intramolecular cyclization of 1,1-dicyanoalkenes under mild conditions. Preject (No. 20072033) supported by the National Natural Science Foundation of China, and Zhejiang Provincial Natural Science Foundation of China     

金属材料学课程教学探讨

提高金属材料学课程教学质量,夯实学生的专业知识与技能,一直是该门课程教学面临的难题。本文就该课程教学进行了探讨并揭示讲授绪论时需要激发学生的学习热情,讲授合金化理论内容时需要进一步与前期专业基础课程《材料科学基础》和《固态相变》课程中的知识点相结合,同时该课程教学过程中需要开设一定的课带实验,有助于学生掌握抽象的专业理论与技能。此外,引导学生利用现代信息技术了解金属材料学最新研究发展动态。