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Ian Alfaro,Lorena Molina,Pablo Gonzalez,Jose Gaete,Fernando Valenzuela,Jose F. Marco,Cesar Saez,Carlos Basualto 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-
The aim of this work is to produce a superparamagnetic core-shell adsorbent material composed ofmagnetite nanoparticles coated with a silica layer and functionalized with betaine for applicationsassociated with the recovery of molybdenum and rhenium anions from highly acidic aqueous solutions. The resulting nanoparticles with a quaternary amine surface were predominantly spherical with averagediameters of 14.3 1.7 nm. Adsorption experiments at pH values of 1-2 confirmed that it was possible touptake molybdate and perrhenate species using this adsorbent nanomaterial, achieving maximumloading capacities of 15 mg/gMNP for Mo and 19 mg/gMNP for Re.
Alexandre da Trindade Alfaro,Gustavo Graciano Fonseca,Evellin Balbinot,Nilson Evelazio de Souza,Carlos Prentice 한국식품과학회 2014 Food Science and Biotechnology Vol.23 No.3
A factorial design and response surfacemethodology were used to optimize the extraction processof tilapia skin gelatin (Oreochromis urolepis hornorum). The concentrations of NaOH (0.15%-0.35%) and H2SO4(0.15%-0.35%), the extraction temperature (40°C-60°C),and the extraction time (3-15 h) were independent variables. Response variables were yield (%), viscosity (mPa·s), andgel strength (g). The NaOH (%) and H2SO4 (%) concentrationshad significant influences (p<0.05) on viscosity and gelstrength, while the extraction temperature (oC) and theextraction time (h) showed significant influences (p<0.05)on all dependent variables. Increasing the temperature andextraction time provided higher yields with a reduction inthe gelatin viscosity and gel strength. Tilapia fish skin canbe used as a source for production of gelatin.
Martin Herrera Trejo,Eddy Alfaro Lopez,Jose Jorge Ruiz Mondragon,Manuel de Jesus Castro Roman,Hugo Solis Tovar 대한금속·재료학회 2010 METALS AND MATERIALS International Vol.16 No.5
The solidification path and contraction generated during the solidification of three carbon steels were studied. Two of the carbon steels were of hypo-peritectic chemical composition, with 0.11 % C and 0.15 % C, while one of the carbon steels were hyper-peritectic with 0.16 % C. The steels with 0.11 % C and 0.16 % C solidified as expected due to their chemical composition. In contrast, the chemically hypo-peritectic steel with 0.15 % C solidified as hyper-peritectic steel, which was associated with the microsegregation of Mn. For the steel exhibiting a hypo-peritectic solidification path, peritectic transformation occurred at solid fraction values higher than 0.9, where it was assumed that the contraction generated in the mushy shell cannot be fed by the liquid. However, for steels exhibiting a hyper-peritectic solidification path, peritectic transformation began at solid fraction values lower than 0.9, where the contraction generated by the peritectic transformation was partly fed by the liquid. Hence, the highest cracking susceptibility was associated with the hypo-peritectic solidification mode.
NEM-FEM comparison on porthole die extrusion of AA-6082
Francesco Gagliardi,Iciar Alfaro,Giuseppina Ambrogio,Luigino Filice,Elias Cueto 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.4
Porthole die extrusion is a forming process used to manufacture hollow components with different shapes. This forming process is optimized to improve the welding line quality. Process optimization can be achieved by determining the influences that each process parameter has on the pressure along the welding plane. The construction complexity of the die results in research difficulty from an experimental point of view. Even the finite element method (FEM) presents relevant drawbacks primarily because of numerical codes are not capable of simulating the welding phase. Hence, the natural element method (NEM), which allows the joining phase of free surfaces,presents significant advantages. In this work, experimental results obtained using a flexible porthole die are discussed. A suitable 2D geometry was extracted from the die, and both FEM and NEM were conducted. A good agreement among the numerical results was recorded.
Khor, Tze Sheng,Alfaro, Eduardo E.,Ooi, Esther M. M.,Li, Yuan,Srivastava, Amitabh,Fujita, Hiroshi,Park, Youn,Kumarasinghe, Marian Priyanthi,Lauwers, Gregory Yves Lippincott Williams Wilkins, Inc. 2012 The American journal of surgical pathology Vol.36 No.3
Dysplasia in Barrett esophagus has been recognized to be morphologically heterogenous, featuring adenomatous, foveolar, and hybrid phenotypes. Recent studies have suggested a tumor suppressor role for CDX-2 in the metaplasia-dysplasia-carcinoma sequence. The phenotypic stability and role of CDX-2 in the neoplastic progression of different types of dysplasias have not been evaluated. Thirty-eight endoscopic mucosal resections with dysplasia and/or intramucosal carcinoma (IMC) arising in Barrett esophagus were evaluated for the expression of MUC5AC, MUC6, MUC2, CD10, and CDX-2. The background mucosa was also evaluated. The results were correlated with morphologic classification and clinicopathologic parameters. Of 38 endoscopic mucosal resections, 23 had IMC and dysplasia, 8 had IMC only, and 7 had dysplasia only. Among dysplastic lesions, 73% were foveolar, 17% were adenomatous, and 10% were hybrid. Twenty of 23 cases with dysplasia and adjacent IMC showed an identical immunophenotype of dysplasia and IMC comprising 16 gastric, 3 intestinal, and 1 mixed immunophenotype. Three cases showed discordance of dysplasia and IMC immunophenotype. These findings suggest that most Barrett-related IMC cases are either gastric or intestinal, with phenotypic stability during progression supporting separate gastric and intestinal pathways of carcinogenesis. CDX-2 showed gradual downregulation of expression during progression in adenomatous dysplasia but not in foveolar or hybrid dysplasia, supporting a tumor suppressor role, at least in the intestinal pathway. CDX-2 was also found to be expressed to a greater degree in intestinal metaplasia compared with nonintestinalized columnar metaplasia. Consistent with CDX-2 as a tumor suppressor, this suggests that nonintestinalized columnar metaplasia may be an unstable intermediate state at risk for neoplastic progression.