Problematic use of social media: The influence of social environmental forces and the mediating role of copresence.

People's dependence on technology in the digital environment has increasingly become the focus of academic and social attention. Social media, in particular, with the functions of connecting with others and maintaining interactions, has become an inseparable part of people's lives. Although the formation of problematic use of social media has been extensively discussed by scholars, it is mainly confined to the individual level and lacks a macro perspective from the external environment.

How Ethical Leadership Prompts Employees' Voice Behavior? The Roles of Employees' Affective Commitment and Moral Disengagement.

Previous literature has demonstrated that ethical leadership could predict employees' voice behavior. However, it's not clear how to heighten these positive effects of ethical leadership on employees' voice behavior. Building on the AET and moral disengagement studies, we developed an integrated model.

The preparation, characterization and evaluation of regenerated cellulose/collagen composite hydrogel films.

Porous structured regenerated cellulose films were oxidized by periodate oxidation to obtain 2,3-dialdehyde cellulose (DARC) films, which were then reacted with collagen to obtain DARC/Col composite films. The subsequent FT-IR spectra indicated that collagen was immobilized on the DARC matrix via the Schiff base reaction between NH2 in collagen and CHO in DARC backbone. Scanning electron microscopy revealed that DARC/Col exhibited a refined 3D network structure and its porosity and pore size decreased with increasing of collagen concentration.