Informal social relations play a significant role in people's lives. Despite considerable research on social networks and social capital, sociologists still do not clearly understood why some relationships lead to better outcomes than others. This article examines how individuals mobilize social support, defined as resources that flow through social relations, to achieve their objectives. We pr...

This paper examines the normal force between two opposing polyelectrolyte brushes and the interpenetration of their chains that is responsible for sliding friction. It focuses on the special case of semi-dilute brushes in a salt-free theta solvent, for which Zhulina and Borisov (J. Chem. Phys. 107, 5952 (1997)) have derived analytical predictions using the classical strong-stretching theory (SS...

Abstract Do older adults construct more emotionally gratifying social environments than younger adults? According to socioemotional selectivity theory (SST), actively their satisfy emotional goals, drawing closer close others and pruning less rewarding persons. Yet, there is a scarcity of direct evidence showing that indeed by negative persons positive We employed novel network decision task st...

This paper reports on a field study of several partially distributed groups working in an insurance company. Data were collected via interviews, a questionnaire, and meeting observation. The data support parts of several theories including media richness and social information processing, and also reveal other constructs which are not found in current theories. Two of these are convenience and ...

Social facilitation and social support literature, diverging with regards to increasing versus decreasing of an individual’s tension, apprehend different aspects of “the presence of others.” To examine the neural correlates of social presence effects, whether “the presence of others” increases or decreases an individual’s tension, we measured prefrontal activation while participants performed a...

Decadal variations of very small amplitude [;0.38C in sea surface temperature (SST)] in the tropical Pacific Ocean, the genesis region of the interannual El Niño–Southern Oscillation (ENSO) phenomenon, have been shown to have powerful impacts on global climate. Future projections from different climate models do not agree on how this critical feature will change under the influence of anthropog...

background: social capital has been defined as norms, networks, and social links that facilitate collective actions. social capital is related to a number of main social and public health variables. therefore, the present study aimed to determine the factors associated with social capital among the residents of tehran, iran.   methods: in this large cross-sectional population-based study, 31531...

mental health plays an important role in ensuring the dynamism and efficiency of every community. since human resources have crucial role in the cultural, social and economical developments of communities, students also are the brilliant segments of society and creators of future of each country therefore, assessing of their mental health is of utmost importance. the aim of the present study is...