198,355 research outputs found
Supporting data for Polymeric medical sutures: An exploration of polymers and green chemistry
No full textFull description in Readme file.These files contain data along with associated output from instrumentation supporting all results reported in Knutson, C. M.; Schneiderman, D. K.; Yu, M.; Javner, C. H.; Distefano, M. D.; Wissinger, J. E. Polymeric medical sutures: An exploration of polymers and green chemistry. J. Chem. Educ. 2017, 94, 1761–1765. In Knutson, et. al. it was found that with new K–12 national science standards emerging, there is an increased need for experiments that integrate engineering into the context of society. Here we describe a chemistry experiment that combines science and engineering principles while introducing basic polymer and green chemistry concepts. Using medical sutures as a platform for investigating polymers, students explore the physical and mechanical properties of threads drawn from poly(ε-caprolactone) samples of different molecular masses and actual purchased absorbable and nonabsorbable medical sutures. An inquiry-based part of the experiment tasks students with designing their own experiment to probe the potential of melt blending poly(ε-caprolactone) with commercially available polylactide products in order to modify the properties of the “sutures” drawn. Through these lessons students gain an appreciation for the importance of plastics in our society and how scientists are working to develop more sustainable alternatives. Overall, this laboratory experiment provides a feasible, versatile, sophisticated laboratory experience that engages students in a relatable topic and meets many of the Next Generation Science Standards.Minnesota Pollution Control Agency (Swift 52526)NSF CHE-1413862NSF RET DMR-1559833Knutson, Cassandra M; Schneiderman, Deborah K; Yu, Ming; Javner, Cassidy H; Distefano, Mark D; Wissinger, Jane E. (2018). Supporting data for Polymeric medical sutures: An exploration of polymers and green chemistry. Retrieved from the University Digital Conservancy, https://doi.org/10.13020/D6F115
Definición del plan estratégico de content del negocio CMB y GB&M del Banco HSBC Bank Argentina S.A. para la generación de engagement en la red social LinkedIn
No full textFil: Distefano, Victor. Universidad de San Andrés. Escuela de Negocios; Argentina
Classes of Colors and Timbres: A Clustering Approach
No full textSimilarities between different sensory dimensions can be addressed consid-ering common "movements" as causes, and emotional responses as effects. An imaginary movement toward the "dark" produces "dark sounds" and "dark colors," or, toward the "bright," "brighter colors" and "brighter sounds." Following this line of research, we draw upon the confluence of mathematics and cognition, extending to colors and timbres the gestural similarity conjec-ture, a development of the mathematical theory of musical gestures. Visual "gestures" are seen here as paths in the space of colors, compared with paths in the space of orchestral timbres. We present an approach based on cluster-ing algorithm to evaluate the association between color bands and orchestral timbres. The analysis is based on 8 indicators which represent and describe participants' background and associations to be tested. The indicators in-clude socio-demographic information and color class options from the color space, to associate with each given timbre class. We clustered responders into homogeneous groups where the within-group-object dissimilarity is min-imized and the between-group-object dissimilarity is maximized. The parti-tions are obtained with k-mo des. While participants' background does have an influence in their answers, the overall behaviors confirms the existence of different space regions for different timbres, supporting our hypothesis of perceived similarities similarities between color and timbre classes. In fact, the cluster analysis confirms identifiable blocks. Our pioneering study on a small dataset may open the way toward a future and deeper comprehension of complex color-timbre perceived connections
Systemic risk in the global water input-output network
No full textThe issue of water access and security has been emphasized in the recent policy debate on sustainable development (Sustainable Development Goal No. 6) and adaptation to climate change (CoP21 in Paris, 2015). This study provides new evidence about the Blue Virtual Water Input-Output Network. The main novelty of our approach is the combination of Structural Decomposition Analysis (SDA) with Network Theory. SDA reveals that size-related, technological and structural components have contributed substantially to changes in virtual water use. Network analysis offers new insights about the vulnerability of the system to shocks through trade links across country-sector pairs. Our analysis highlights a possible trade-off in the increasing importance of virtual water trade: the efficiency improvement in granting access to virtual water might come at the cost of increasing systemic vulnerability. Overall, the great unbalance between water availability and usage combined with rigidity of global consumption and production networks and the risk of cascade effects imply increasing vulnerability of the virtual water network to shocks propagation
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