The spiral of silence: examining how cultural predispositions,news attention,and opinion congruency relate to opinion expression     

Shirley S. Ho  Vivian Hsueh-Hua Chen  Clarice C. Sim 《亚洲交流杂志》2013,23(2):113-134

This study examines new explanatory predictors behind the spiral of silence theory, using the issue of legalization of same-sex marriage in Singapore as the context of study. Our results show that fear of isolation and saving face were negatively associated with individuals' willingness to express their opinion on the issue, whereas news attention and issue salience were positively associated. Also, fear of isolation was negatively associated with individuals' willingness to offer a rationale for their opinion, whereas news attention and issue salience were positively associated. Power distance had no effects on outspokenness. Notably, news attention moderated the influence of fear of isolation and saving face on public outspokenness.  相似文献   

Social isolation and physical inactivity in older US adults: Results from the Third National Health and Nutrition Examination Survey     

《European Journal of Sport Science》2013,13(5):347-353

Abstract

Physical inactivity is a risk factor for cardiovascular and other chronic diseases. It has been shown that both physical inactivity and social isolation increase with age, and that these factors are detrimental to physical and mental well-being. The purpose of the present study was to examine the relationship between physical inactivity and social isolation in older US adults. Using data from a nationally representative cross-sectional survey, the Third National Health and Nutrition Examination Survey, 1988–1994, we assessed the age- and race-specific prevalence of no leisure-time physical activity in relation to various forms of social interaction. The prevalence of no leisure-time physical activity increases with age in both men and women. In non-Hispanic whites, non-Hispanic blacks, and Mexican Americans, the prevalence of no leisure-time physical activity is increased in older US adults who are socially isolated. Social isolation is related to physical inactivity among persons 60 years and older. Longitudinal and intervention studies are needed to establish whether increased social support translates to a more active population of older adults.  相似文献   

液-液隔离式毛细管黏度仪研制     

万桂怡  孙晓明  崔建军 《实验技术与管理》2013,30(6):36-38

黏度仪采用2个毛细管串联、中间设置一个液-液隔离器的研发方案。通过气动系统、智能控制系统等实现毛细管黏度计的精确测量。叙述了该系统的测量原理,介绍了该系统的结构和应用。  相似文献   

路基强度稳定技术研究   总被引：1，自引：0，他引：1  

张九香 《福建工程学院学报》2009,7(4)

由于路面竣工后,降水等入侵路基或地下水位发生变动时土基回弹模量值将大幅下降,引起路基强度失稳,进而损坏道路结构.文章分别研究分析了毛细水上升和气态水上升引起路基回弹模量的变化后路基强度降低对路面结构力学特性的影响程度,并基于此推荐采取隔断的办法以切断上下土层间的连接,阻断毛细水和气态水上升通道,以解决重载长效沥青路面中路基强度和稳定问题.  相似文献   

钢弹簧地铁浮置隔振装置的力学模型分析     

侯勇  张向慧 《北京工业职业技术学院学报》2009,8(1):34-36

对地铁浮置隔振装置建立了力学模型,并利用有限元分析软件对模型进行了力学分析,证实了浮置板轨道结构良好的隔振性,从而得出了浮置隔振装置在轨道上的最佳分布方案。  相似文献   

基于MSP430单片机的电机智能转速监测系统设计     

淮文军  石贵江  於汝彪 《苏州市职业大学学报》2012,23(1):15-18

设计一种由MSP430单片机构成的智能转速监测系统．该系统由与电机同轴的齿轮信号盘和霍尔转速传感器组成,对霍尔转速传感器输出的信号进行滤波和整形,使处理后的信号转换成标准的方波信号,隔离后由单片机计数,通过LED显示实时转速值．与传统的测速仪相比,可设定转速监测范围、存储设定参数,当电机超速时,可发出报警信号．试验证明,该系统测速精度高,电机状态监测可靠．  相似文献   

Bicausal bond graphs for supervision: From fault detection and isolation to fault accommodation     

A.K. Samantaray  S.K. Ghoshal 《Journal of The Franklin Institute》2008,345(1):1-28

Model-based fault detection and isolation (FDI) requires an analytical system model from which fault indicators can be derived by assigning proper computational causalities. Many bond graph (BG) model-based techniques for FDI have been developed in recent past. Furthermore, many other advances have been made in the field of control engineering applications of BG modelling. Supervision systems not only perform FDI, but also take the necessary steps for fault accommodation. Fault accommodation is done either through system reconfiguration or through fault tolerant control (FTC). In this paper, it is shown that bicausal BG modelling proves to be a unified approach for sensor placement from the FDI and FTC viewpoint, identification of hardware redundancies for system reconfiguration, generation of fault indicators, estimation of fault parameters for fault accommodation, inversion of systems and actuator sizing for FTC, etc. It is shown that the use of bicausalled BG helps to integrate many of the recently developed advances made in the field of control engineering into development of complex supervision systems.  相似文献   

安全操作系统中的功能隔离机制     

龚育昌  唐玲  张晔  贾永泉 《中国科学院研究生院学报》2008,25(4):538-548

在分析现有操作系统安全机制的基础上,针对空间隔离技术的不足之处,提出了功能隔离的新思想。功能隔离可以提供更细致的隔离粒度,并可使不同类别的功能请求在相互隔离的执行域中执行,从而提高系统的可靠性与安全性。文中详细描述了功能隔离的定义,讨论了功能划分的方法和PFI、ASFI两种功能隔离机制及其关键实现技术。实验数据说明,采用功能隔离不会明显影响系统的效率。  相似文献   

Explicating anomie in refugee women’s integration narratives: A qualitative research study     

《Int J Intercult Relat》2020

Refugee women flee from their home countries due to civil unrest, war, persecution and migrate to Western countries such as the United States in search of a safe haven. This research study conducted in an Upper Midwest community in the US unveils integrations experiences of refugee women from their standpoint. The integration narratives obtained through in-depth interviews with 16 refugee women aged 40 years and above depicted traits of anomie as described by Emile Durkheim and Robert Merton. Excerpts from the integration narratives conveyed anomic traits such as feelings of, loneliness and sadness, lack of purpose/meaning, unmet expectations, feeling isolated, and retreatism mode of adaptation. Using these themes, the study explored how such experiences reinforce anomie among the refugee women. Although this research study does not claim universal representation of refugee women experiences, the discussion provided serves to help communities understand the women’s integration experiences and implement structures and practical guidelines for successful integration.  相似文献   

频段内汽车悬架时滞反馈控制参数优化     

刘建均  孙艺瑕  李胜 《教育技术导刊》2020,19(5):102-106

对有限频段内汽车悬架系统的时滞反馈控制参数优化问题进行研究。首先,建立时滞加速度反馈控制下 1/4 汽车悬架系统力学模型,推导出车身和车轮加速度幅值的解析表达式;其次,通过对系统稳定性分析,得到关于反馈增益系数和时滞的稳定性分区图,以数值计算验证稳定性分析的正确性;最后,在有限频段内以最大车身加速度变化的百分比为优化目标,以反馈增益系数和时滞为优化参数,利用粒子群优化算法获得有限频段内最优反馈增益系数和时滞。实验结果表明,与被动汽车悬架系统相比较,最优时滞反馈控制下汽车悬架系统的隔振性能获得了明显提高,在最优时滞反馈控制参数取值下,有限频段内车身加速度幅值至少降低37.27%。  相似文献