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Mechanical Properties of a Wood Flour-PET Composite Through Computational Homogenisation

Computers, Materials & Continua 2021年第6期67卷 4061-4079页

作者： P.Pesante K.Saavedra g.pincheira M.Sc.in Mechanical Engineering Faculty of EngineeringUniversidad de Talca CampusCuricóChile Department of Industrial Technologies Faculty of EngineeringUniversidad de Talca CampusCuricóChile

This work proposes to study the effective elastic properties(EEP)of a wood-plastic composite(WPC)made from polyethylene terephthalate(PET)and Chilean Radiate pine’s wood our,using nite element simulations of a representative volume element(RVE)with periodic boundary *** are validated through a static 3-point bending test,with specimens obtained by extruding and *** effect of different weight fractions,space orientations and sizes of particles are here *** predictions are empirically conrmed in the sense that composites with more wood our content and bigger size,have higher elastic ***,these results are very sensitive to the orientation of *** and Reuss mean-eld homogenisation approaches are also given as upper and lower *** tests evidence that exural strengths and ultimate tensile elongations decrease respect to 100%PET,but these properties can be enhanced considering particle-size distributions instead of a xed size of wood our.

关键词： Wood-plastic composite periodic homogenisation mechanical properties experimental validation

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Biceps femoris long head sarcomere and fascicle length adaptations after 3 weeks of eccentric exercise training

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Journal of Sport and Health Science 2022年第1期11卷 43-49页

作者： Patricio A.pincheira Melissa A.Boswell Martino V.Franchi Scott L.Delp glen A.Lichtwark School of Human Movement and Nutrition Sciences The University of QueenslandBrisbaneQLD 4072Australia Department of Bioengineering and Mechanical Engineering Stanford UniversityStanfordCA 94305USA Department of Biomedical Sciences University of PadovaPadova 35122Italy

Background:Eccentric exercise increases muscle fascicle lengths;however,the mechanisms behind this adaptation are still *** study aimed to determine whether biceps femoris long head(BFlh)fascicle length increases in response to 3 weeks of eccentric exercise training are the result of an in-series addition of sarcomeres within the muscle ***:Ten recreationally active participants(age=27±3 years;mass=70±14 kg;height=174±9 cm;mean±SD)completed 3 weeks of Nordic hamstring exercise(NHE)training on a custom exercise device that was instrumented with load *** collected in vivo sarcomere and muscle fascicle images of the BFlh in 2 regions(central and distal)by using microendoscopy and 3 dimension *** then estimated sarcomere length,sarcomere number,and fascicle length before and after the training ***:Eccentric knee flexion strength increased after the training(15%;pgnificant increase in fascicle length(21%;pgth(17%;pge in either ***:Fascicle length adaptations appear to be heterogeneous in the BFlh in response to 3 weeks of NHE *** increase in sarcomere length,rather than the addition of sarcomeres in series,appears to underlie increases in fascicle length in the distal region of the *** mechanism driving regional increases in fascicle and sarcomere length remains unknown,but we speculate that it may be driven by regional changes in the pas sive tension of muscle or connective tis sue adaptations.

关键词： Hamstrings Nordic hamstring exercise Sarcomerogenesis

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Photonics bridges between turbulence and spin glass phenomena in the 2021 Nobel Prize in Physics

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Light(Science & Applications) 2022年第5期11卷 743-745页

作者： A.S.L.gomes C.B.de Araújo A.M.S.Macêdo I.R.R.gonzález L.de S.Menezes P.I.R.pincheira R.Kashyap g.L.Vasconcelos E.P.Raposo Departamento de Física Universidade Federal de PernambucoRecifePE 50670-901Brazil Unidade Acadêmica de Belo Jardim Universidade Federal Rural de PernambucoBelo JardimPEBrazil Chair in Hybrid Nanosystems Nanoinstitut MünchenFakultät für PhysikLudwig-Maximilians-Universität München80539 MünchenGermany Departamento de Ciencias Físicas Universidad de La FronteraTemucoChile Fabulas Laboratory Department of Engineering PhysicsDepartment of Electrical EngineeringPolytechnique MontrealMontreal H3C 3A7 QCCanada Departamento de Física Universidade Federal do ParanáCuritibaPR 81531-990Brazil

A photonic connection between turbulence and spin glasses has been recently established both theoretically and experimentally using a random fiber laser as a photonic *** unveiling this interplay,it links the works of... 详细信息

关键词： fiber turbulence Nobel

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Territorial Planning for Coastal Zones in Chile:The Need for geographical-Environmental and Natural Risk Indicators for Spatial Decision Support Systems

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International Journal of geosciences 2013年第6期4卷 17-29页

作者： Fernando Pena-Cortes Daniel Rozas-Vasquez gonzalo Rebolledo Jimmy pincheira-Ulbrich Miguel Escalona Enrique Hauenstein Luis Vargas-Chacoff Carlos Bertran Jaime Tapia Marco Cisternas Laboratorio de Planificacion Territorial Nucleo de Investigacion en Estudios AmbientalesUniversidad Catolica de TemucoTemucoChile Programa de Doctorado en Sistematica y Biodiversidad Universidad de ConcepcionConcepcionChile Escuela de Ciencias Ambientales Facultad de Recursos NaturalesUniversidad Catolica de TemucoTemucoChile Instituto de Ciencias Marinas y Limnologicas Universidad Austral de ChileValdiviaChile Instituto de Quimica de Recursos Naturales Universidad de TalcaTalcaChile Escuela de Ciencias del Mar Pontificia Universidad Catolica de ValparaisoValparaisoChile

Coastal zones are very dynamic and fragile environments, constituting a landscape ever more heterogeneous, fragmented and with increasing levels of complexity due to the changing relationship between man and nature. Integrated coastal zone management therefore requires detailed knowledge of the system and its components, based—to a large extent—on technical and scientific information. However, the information generated must be in line with the political requirements necessary for decision-making and planning. Thus the use of indicators to give a simplified view of the many components of the territory, and at the same time to provide important information about patterns or trends, becomes a tool of the utmost importance. These indicators can be understood as measurable characteristics of the environment, which facilitate comprehension of the processes occurring at different scales and serve as a reference to inform the population and support decision-making. The aim of the present note is to demonstrate briefly the need to develop geographical-environmental and natural risk indicators to facilitate comprehension of the dynamic of spatial and temporal landscape patterns, particularly in coastal environments. This approach offers an historical summary of the natural, socio-economic and political processes which currently make up the territory, and which without doubt will continue to influence it in the future. At the same time, it is proposed that information should be integrated on the basis of this framework with a view to generating spatial decision support systems in a context of planning and integrated management of the coastal zones of Chile.

关键词： Coastal Zone Territorial Planning Indicators Spatial Decision Support System Chile

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