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Experimental investigation on variability in properties of Amazonian wood species Muiracatiara ( Astronium lecointei ) and Maçaranduba ( Manilkara huberi ) focusing guitar fingerboards manufacturing

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Journal of Bioresources and Bioproducts 2021年第1期6卷 33-38页

作者： Roseli Felix da Silva Ribeiro JoséFlávio Silveira Feiteira Jayme Pereira de Gouvê alexandre furtado ferreira Federal Fluminense University PPGEMVolta RedondaRJBrazil Federal Fluminense University PGMECVolta RedondaRJBrazil

In face of scarcity in the supply of non-traditional Brazilian woods properly treated for use in high quality musical instruments,pieces of Amazonian wood species muiracatiara(Astronium lecointei)and maçaranduba(Manilkara huberi)purchased in the common internal Brazilian timber market were *** species were pre-selected for use in fingerboards of acoustic and electric guitars due to similar properties with ebony(Diospyros crassiflora).Variabilities of elastic modulus parallel to grain and density were investigated inside wooden *** addition,referred parameters were used in calculation of speed of *** tests were performed in order to compare both species and revealed inequality for variances of dynamic elastic modulus(E_(d))and speed of sound,but equality for *** of means was also examined via unequal variance *** color differences,lower variability of *** led to the indication of this species as likely capable to substitute satisfactorily ebony in fingerboards manufacturing.

关键词： Mechanical properties variability Wood grain slope Experimental analysis Impulse excitation technique F-test

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Numerical Simulation of Microstructural Evolution via Phase-Field Model Coupled to the Solutal Interaction Mechanism

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Materials Sciences and Applications 2015年第10期6卷 907-923页

作者： alexandre furtado ferreira Ingrid Meirelles Salvino Tomaskewski Késsia Gomes Paradela Dimas Moraes da Silva Roberto Carlos Sales Graduate Program on Metallurgical Engineering Graduate Program on Mechanical Engineering Federal Fluminense University Volta Redonda Brazil

A phase-field model coupled to the multiphase/multiscale model is used to simulate the microstructural morphology and predict the CET during solidification. The considered mechanism for the CET is based on interactions of solute between the equiaxed grains and the advancing columnar front. The results for the solute concentration in liquid region, dendrite tip velocity, volume fraction of the liquid and solid are presented and discussed. The phase-field model is used to simulate the dendritic morphology of an alloy directionally solidified, by imposing a constant temperature gradient. The simulation of the equiaxed grains growth requires a further important element, the growth of grains with different crystallographic orientations. The grain orientations are generated randomly for each nucleus introduced in computational domain. Finally, the coupling results between the multiphase/multiscale model and phase-field are presented and discussed. For higher nuclei density present in the melt, a shorter distance between mold wall and the equiaxed zone in the solidification process can be observed. A solute concentration boundary layer exists in the liquid along the columnar grain contour. The concentrations in the solid indicate the presence of a microsegregation pattern. The simulated results show that the solidification features are consistent with those observed based on the metallographic examinations of cast microstructures reported in the literature.

关键词： Columnar-to-Equiaxed Transition Directional Solidification Al-Cu Alloy

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Giardia infection:Protein-losing enteropathy in an adult with immunodeficiency

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World Journal of Gastroenterology 2012年第19期18卷 2430-2433页

作者： alexandre Khodr furtado Virginia Lucia Ribeiro Cabral Thiago Nunes Santos Eli Mansour Cristiane Kibune Nagasako Sonia Leticia Lorena Rogerio Antunes Pereira-Filho Faculdade de Ciências Médicas Universidade de Campinas-UnicampRua Tessália Vieira de Camargo126Cidade Universitária "Zeferino Vaz"13083-887 CampinasBrazil

The case of a 52-year-old woman with a past history of thymoma resection who presented with chronic diarrhea and generalized edema is the focal point of this article.A diagnosis of Giardia lamblia infection was established,which was complicated by protein-losing enteropathy and severely low serum protein level in a patient with no urinary protein loss and normal liver *** anti-helmintic treatment,there was recovery from hypoalbuminemia,though immunoglobulins persisted at low serum levels leading to the hypothesis of an immune system ***'s syndrome is a rare cause of immunodeficiency characterized by the association of hypogammaglobulinemia and *** primary immune disorder may be complicated by severe infectious diarrhea secondary to disabled humoral and cellular immune *** is the first description in the literature of an adult patient with an immunodeficiency syndrome who presented with protein-losing enteropathy secondary to giardiasis.

关键词： Chronic diarrhea Giardiasis Protein-losingenteropathy Immunodeficiency

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