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A. P. Lemes M. A. Soto-Oviedo W. R. Waldman L. H. Innocentini-Mei N. Durán 《Journal of Polymers and the Environment》2010,18(3):250-259
The effect of lignosulfonate on poly(3-hydroxybutyrate-co-3-hydroxyvalerate), PHBV, was studied by scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and
thermogravimetric analysis (TGA). The PHBV/lignosulfonate samples were prepared by melt mixing in an internal mixer. SEM showed
that PHBV/lignosulfonate samples present a cracked surface that is more intense in mixtures with high lignosulfonate proportions.
According to DSC, melting and glass transition temperatures of the PHBV matrix decrease with lignosulfonate addition. The
same effect was observed for melting enthalpies (ΔHm), which indicates a decrease of crystallinity. TGA showed that thermal stability of PHBV/lignosulfonate samples was shifted
to lower temperatures, which indicates the existence of an interaction between the thermal decomposition processes of PHBV
and lignosulfonate. 相似文献
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The international community has compelling humanitarian, political, security and economic reasons to engage in rebuilding and strengthening health systems in fragile states. Improvements in health services and systems help to strengthen civil society and to restore legitimacy to governments. Effective engagement with fragile states to inform the design of health programmes and selection of interventions depends on donor coordination and an understanding of health system challenges. Planning requires consideration of allocation (services to be delivered), production (organisation of services), distribution (beneficiaries of services) and financing. The criteria for selecting interventions are: their impact on major health problems; effectiveness; the possibility of scale-up; equity; and sustainability. There are various options for financing and models of engagement, but support should always combine short-term relief with longer-term development. Stakeholders should aim not only to save lives and protect health but also to bolster nations' ability to deliver good-quality services in the long run. 相似文献
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Using a sample of hospital employees this study addressed whether job satisfaction mediates the relationship between absenteeism predictors and absenteeism and how well absenteeism predictors explained different measures of absenteeism. The results suggest that job satisfaction is not a mediator and that the independent variables explain more variance in records‐based time lost than in self‐reported time lost or self‐reported absence frequency. Implications are discussed in terms of using job satisfaction as a mediator as well as the viability of alternative measures of absenteeism. Copyright © 2000 John Wiley & Sons, Ltd. 相似文献
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Waldman P. Lucas F. S. Varrault G. Moulin L. Wurtzer S. 《Food and environmental virology》2020,12(2):118-129
Food and Environmental Virology - In urban rivers, many of which are used for drinking water production, viruses encounter a range of particulate, colloidal, and dissolved organic and inorganic... 相似文献
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Organizational neuroscience has great promise for advancing organizational research and practice. The field, however, is developing rapidly and has also become the subject of technological and methodological challenges that must be considered when conducting or interpreting neuroscience research as applied to organizational behavior. We explore four issues we deem to be important in understanding the role of neuroscience in organizational behavior research: (i) neuroscientific research and reductionism; (ii) the need to address methodological and technological challenges in conducting this type of research; (iii) how neuroscientific research is meaningful in organizations (the “So what?” issue); and (iv) neuroscience as just another management fad. In addressing these issues, we hope to set out a roadmap that will enable organizational scholars to avoid past mistakes and thus serve to advance multidisciplinary research in organizational behavior using neuroscientific approaches. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献