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Chilean University Students Digital Learning Technology Usage Patterns and Approachesto Learning

ECNU Review of Education 2022年第1期5卷 37-64页

作者： Carlos González Dany Lópeza Lina Calle-Arangoa helena montenegro Paula Clasing Pontificia Universidad Catolica de Chile-Millennium Nucleus Universidad de Chile-Millennium Nucleus University of Michigan

Purpose:This study aims to explore Chilean students'digital technology usage patterns andapproaches to learningDesignlApproach/Methods:We conducted this study in two stages We worked with onesemester learning management systems(LMS),library,and students records data in the *** performed a k-means cluster analysis to identify groups with similar usage *** second stage,we invited students from emerging dusters to participate in group *** analysis was employed to analyze ***:Three groups were identified:ID digital library users/high performers,who adopteddeeper approaches to learning obtained higher marks,and used learning resources to integratematerials and expand understanding 2)LMS and physical library userslmid-performers,whoadopted mainly strategicapproaches obtained marks dlose to average,and used learning resources for studying in an organized manner toget good marks and 3)lower users of LMS andlibrarylmidlow performers,who adopted mainly a surface approach,obtained mid-to-lower-than-averagemarks,and used learning resources for minimum content understanding Originality/Value:We demonstrated the importance of combining learning analytics data withqualitative methods to make sense of digital technology usage patternss approaches to learningare associated with learning resources *** recommendations are presented.

关键词： Academic performance approaches to learning digital technology learning analytics

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Cytocompatible cellulose nanofibers from invasive plant species Agave americana *** Ricinus communis L.:a renewable green source of highly crystalline nanocellulose

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2021年第6期22卷 450-461页

作者： Olga L.EVDOKIMOVA Carla S.ALVES Radenka M.KRSMANOVIC WHIFFEN Zaida O.RTEGA helena TOMáS Joao R.ODRIGUES CQM-Centro de Quimica da Madeira MMRGUniversidade da MadeiraCampus Universitario da Penteada9020-105 FunchalPortugal Faculty of Polytechnics University of Donja GoricaOktoih 18 WOO PodgoricaMontenegro Departamento de Ingenieria de Procesos Universidad de Las Palmas de Gran Canaria35017 Las Palmas de Gran CanariaLas PalmasSpain School of Materials Science and Engineering/Center for Nano Energy Materials Northwestern Polytechnical UniversityXi'an 710072China

In this study,the fibers of invasive species Agave americana *** Ricinus communis *** successfully used for the first time as new sources to produce cytocompatible and highly crystalline cellulose *** nanofibers were obtained by two methods,based on either alkaline or acid *** morphology,chemical composition,and crystallinity of the obtained materials were characterized by scanning electron microscopy(SEM)together with energy-dispersive X-ray spectroscopy(EDX),dynamic light scattering(DLS),X-ray diffraction(XRD),and Fourier transform infrared(FTIR)*** crystallinity indexes(CIs)of the cellulose nanofibers extracted from *** and *** were very high(94.1%and 92.7%,respectively).Biological studies evaluating the cytotoxic effects of the prepared cellulose nanofibers on human embryonic kidney 293 T(HEK293 T)cells were also *** nanofibers obtained using the two different extraction methods were all shown to be cytocompatible in the concentration range assayed(i.e.,0-500μg/mL).Our results showed that the nanocellulose extracted from *** and *** fibers has high potential as a new renewable green source of highly crystalline cellulose-based cytocompatible nanomaterials for biomedical applications.

关键词： Nanofiber Nanocellulose Agave americana L. Ricinus communis L. Crystallinity Invasive species Biomedical application

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