Inked: historic African-American beach site as collective memory and group ‘Third Place’ sociability on Martha’s Vineyard

Using data gained from ethnographic research and interviews, this article examines ‘third place’ sociability in the social interactions of the Polar Bears of Martha’s Vineyard, a group of predominantly but not exclusively middle-aged and senior African-American men and women who swim, exercise and socialise together each morning at ‘the Inkwell’ beach. Using Georg Simmel’s concept of sociability and Ray Oldenburg’s third-place theoretical framework, this study explores the key role of the Monday communal breakfast and the function of conversation in establishing bonds between individuals. It further investigates the promotion of strong feelings of social connectedness, belonging, social support, social capital gains and community among its group members. The ongoing sociability and informal rules of the Polar Bears of Martha’s Vineyard has enabled it to become a model group demonstration of third-place community building. The importance of race, class and place is socio-historically investigated within the broader social context of the popular racialised section of the beach, ‘the Inkwell’, of African-American community life, and within the sub-community milieu of group social interaction.     

劳动力市场分割理论：对大学生自愿性失业的一个解释

从我国经济社会的发展看,大学生就业还有较大空间,但同时也存在着较大比例的大学生自愿性失业,本文认为这是我国劳动力市场分割情况下大学生就业的理性选择。解决该问题的对策在于找到劳动力市场分割的制度性因素,加强劳动力市场建设,发挥市场调控作用。     

作用于车身的约束阻尼板的振动分析

本文对作用于车身的约束阻尼结构进行理论分析和实验分析,分析各种有限元计算方法,计算夹层板的振动特性。并对粘弹于车身顶部的阻尼复合结构进行了模态实验和频率响应实验。     

不同配筋率的钢筋混凝土阻尼性能的实验研究

混凝土的阻尼功能对于提高结构稳定性、安全性和耐久性以及防震减灾等具有重要意义。本文通过试验模态分析法对不同配筋率的钢筋混凝土梁在其各阶固有频率下的阻尼性能进行了研究,结果表明随着配筋率的提高,钢筋混凝土构件的阻尼比是不断减小的。研究构件在自由振动下动态特性对于混凝土结构抗震设计有参考价值。     

共振柱试验的原理及应用

以一维波动理论基础的共振柱试验,是小应变条件测定土动力特性参数的理想方法,近年来,在我国已得到迅速发展,其应用前景十分广泛。本文对共振柱试验的原理、发展及现状进行了简单的分析,并对其应用进行了简单的探讨。     

Labour market segmentation and union wage gaps

Abstract

There has been a great deal of research regard the effects of unions on union – non-union wage gap. Most of the studies regarding the impact of unions on wages have assumed that apart from the division between union and non-union workers, the labour market is relatively homogeneous. A number of economists, however, have argued that the labour market is segmented, implying that there are distinct labour markets and that some workers employment opportunities are concentrated in “bad jobs” while other workers employment opportunities are concentrated in “good jobs” which are rationed.

This paper will explore whether the relative wage differential between union and non-union workers differs between the independent primary, subordinate primary and secondary labour markets. Labour market segments are defined using “job zones”. “Job zones” are distinct groups defined by the level of specific vocational preparation necessary for a particular occupation, allowing for the comparison of skill levels and training for each occupation. The data on “job zones” comes from the Occupational Information Network database (O?Net). We estimate separate equations for union and non-union workers in each segment using data from the Current Population Survey and calculate union non-union differentials for each labour market segment. The findings of this paper suggest that the greatest differentials are in secondary labour markets followed by differentials in the subordinate primary labour market and that the smallest wage differentials are in the independent primary labour market.     

基于虚拟同步机的参数自适应频率控制策略

为了解决传统虚拟同步机无法根据风机运行状态自适应调整控制参数这一问题,提出了一种基于虚拟同步机的参数自适应频率控制策略。首先,建立虚拟同步机控制方式下的双馈风机模型,并利用根轨迹法分析虚拟惯量和阻尼系数对系统稳定性的影响。在此基础上,提出自适应虚拟同步机控制策略与参数整定方法,建立虚拟惯量和阻尼系数与系统频率的函数关系,并根据风机运行状态确定参数初始值,实现虚拟同步机控制参数随频率变化的动态调整。最后,在Matlab/Simulink中进行仿真。结果表明,所提频率控制策略实现了虚拟惯量和阻尼系数的自适应调节,能够充分利用风机旋转动能,有效抑制频率跌落并提升频率恢复速度,提高系统频率稳定性,有助于将新能源有效融入电网,规避电网安全问题,并为新型电力系统建设提供有效参考。     

高速公路环境下区域物流节点选址规划模型

通过分析高速公路对物流发展的影响,引进阻尼系数对区域物流节点的选址模型进行改进,并利用CFLP(capacitated facility location problem)法进行计算,为高速公路环境下区域物流节点选址提供理论依据,并且通过算例分析对理论模型进行验证。     

The need for services and technologies in physical fast fashion stores: Generation Y’s opinion

ABSTRACT

This study answers the question of in which services and technologies should fast fashion retailers with physical stores invest. Fifteen improvement options were identified through a literature review, corporate practice and expert interviews. Then, a sample of 255 members of Generation Y evaluated and classified these options as attractive, indifferent, must-be, one-dimensional, or reverse according to Kano’s approach using the segmented Kano perspective. Results show that Generation Y generally values service improvements (e.g. with respect to salesperson friendliness and competence) higher than technology improvements. However, this evaluation differs among customer segments: whereas quality-conscious fast fashion shoppers are mainly indifferent to technology improvements, other customer segments rate ‘3D Bodyscan’, ‘Barcode App’, ‘Click&Collect’, ‘iDressroom’, ‘iTerminal’, ‘Loc Aware App’, or ‘Self-Checkout’ as highly attractive.     

Properties of first-time vs. repeat visitors: lessons for marketing Norwegian ski resorts

This paper explores the potential in foreign markets for winter tourism in Norway and discusses the influencing factors explaining why foreign tourists visit and revisit Norway on ski vacations. In a decreasing market, it becomes increasingly important to destination managers and marketers to choose the right marketing strategies and direction. We focus on characteristics that influence and explain why foreign tourists choose to return. More than 3000 respondents from Sweden, Denmark, and Germany were asked for their image of Norwegian ski destinations and criteria for winter vacation selection. We fitted mainly hurdle and quantile regressions to gain consistent and less biased estimates. Stable snow conditions, combining alpine and cross-country skiing, and no fees for the latter are some of Norway's competitive but seldom marketed advantages, and especially towards repeat visitors. Repeaters typically prefer self-catering accommodation and are less price sensitive. Surprisingly, foreign ski tourists are not very interested in other snow-based activities or cultural attractions. Despite repeaters constituting the majority of foreign ski tourists, neither the national development and marketing agency (Innovation Norway) nor local tourist organizations and marketers have a strategy for targeting them. We recommend a shift from profile marketing towards segmented marketing, aimed especially at the repeat-visitor segment.