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Search Results: 1 - 10 of 5630 matches for " Arturo Bueno Tokunaga "
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Estudio de la recristalización secundaria en un acero de bajo carbono laminado a alta temperatura
Ramos Escobedo,Gema T; Bueno Tokunaga,Arturo; Rendón García,Nallely M;
Revista Latinoamericana de Metalurgia y Materiales , 2007,
Abstract: durante la inspección de rutina de la microestructura de una lámina de acero de bajo carbono de 1,9 mm de espesor, producida por laminación continua a alta temperatura de un planchón delgado de 50 mm de espesor fabricado por colada continua, se encontró evidencia de la formación de bandas longitudinales superficiales de granos de ferrita anormalmente grandes. el análisis del comportamiento de disolución de fe3c y de la recristalización de la fase a-fe durante tratamientos de recocido permitió descubrir una fuerte decarburización superficial de la lámina. en base a la anterior observación, la presencia de esta inusual microestructura fue atribuida a la deformación, recristalización y crecimiento anormal de grano de la fase a-fe deformada a alta temperatura durante la laminación en caliente y al enfriamiento lento asociado con las altas temperaturas de acabado y enrollado de la cinta de acero. la existencia de bandas superficiales con granos finos y grandes se atribuyó a que la decarburización no fue uniforme en la superficie del planchón o la lámina. en regiones no decarburizadas, la recristalización normal de la austenita entre los pasos de laminación resultó en una microestructura de granos finos de a-fe una vez que se realizó la transformación de fase en el material.
Estudio de la recristalización secundaria en un acero de bajo carbono laminado a alta temperatura During the routine inspection of the microstructure of a low carbon steel sheet 1.9 mm of thickness, produced by high temperature rolling of a continuous casting slab, 50 mm thickness, the formation of superficial coarse ferrite grains was observed. A strong decarburization on the surface of the steel
Gema T Ramos Escobedo,Arturo Bueno Tokunaga,Nallely M Rendón García
Revista Latinoamericana de Metalurgia y Materiales , 2007,
Abstract: Durante la inspección de rutina de la microestructura de una lámina de acero de bajo carbono de 1,9 mm de espesor, producida por laminación continua a alta temperatura de un planchón delgado de 50 mm de espesor fabricado por colada continua, se encontró evidencia de la formación de bandas longitudinales superficiales de granos de ferrita anormalmente grandes. El análisis del comportamiento de disolución de Fe3C y de la recristalización de la fase a-Fe durante tratamientos de recocido permitió descubrir una fuerte decarburización superficial de la lámina. En base a la anterior observación, la presencia de esta inusual microestructura fue atribuida a la deformación, recristalización y crecimiento anormal de grano de la fase a-Fe deformada a alta temperatura durante la laminación en caliente y al enfriamiento lento asociado con las altas temperaturas de acabado y enrollado de la cinta de acero. La existencia de bandas superficiales con granos finos y grandes se atribuyó a que la decarburización no fue uniforme en la superficie del planchón o la lámina. En regiones no decarburizadas, la recristalización normal de la austenita entre los pasos de laminación resultó en una microestructura de granos finos de a-Fe una vez que se realizó la transformación de fase en el material.
Metal Dependence of Signal Transmission through MolecularQuantum-Dot Cellular Automata (QCA): A Theoretical Studyon Fe, Ru, and Os Mixed-Valence Complexes
Ken Tokunaga
Materials , 2010, DOI: 10.3390/ma3084277
Abstract: Dynamic behavior of signal transmission through metal complexes [L5M-BL-ML5]5+ (M=Fe, Ru, Os, BL=pyrazine ( py), 4,4’-bipyridine ( bpy), L=NH3), which are simplified models of the molecular quantum-dot cellular automata (molecular QCA), is discussed from the viewpoint of one-electron theory, density functional theory. It is found that for py complexes, the signal transmission time (tst) is Fe(0.6 fs) < Os(0.7 fs) < Ru(1.1 fs) and the signal amplitude (A) is Fe(0.05 e) < Os(0.06 e) < Ru(0.10 e). For bpy complexes, tst and A are Fe(1.4 fs) < Os(1.7 fs) < Ru(2.5 fs) and Os(0.11 e) < Ru(0.12 e)
EARLY ENGLISH PRINTING AND THE HANDS OF COMPOSITORS
Satoko Tokunaga
International Journal of English Studies (IJES) , 2005, DOI: 10.6018/ijes.5.2.47761
Abstract: This paper examines soine distinctive uses of typefaces by Caxton's compositors in his early products at Westminster and illustrates how useful such examples are in revealing the chronology of actual book production, as well as in identifying the compositors at work on individual volumes. An exhaustive analysis of early printed books can provide us with information about compositors at work in England's earliest printing house. This paper therefore argues that it is inost definitely worth considering such 'inechaiiical' aspects of book design as typography when editing any printed text, and introduces most recent research results contributed by a project at Keio University, which airns to establish a semiautomatic system that can transcribe every feature of the printed text including even minute differences in types.
Quantum coin flipping with arbitrary small bias is impossible
Yuki Tokunaga
Physics , 2001,
Abstract: Lo and Chau showed that an ideal quantum coin flipping protocol is impossible. The proof was simply derived from the impossibility proof of quantum bit commitment. However, the proof still leaves the possibility of a quantum coin flipping protocol with arbitrary small bias. In this paper, we show that a quantum coin flipping protocol with arbitrary small bias is impossible and show the lower bound of the bias of quantum coin flipping protocol.
Geometry of irreducible plane quartics and their quadratic residue conics
Hiroo Tokunaga
Mathematics , 2009,
Abstract: Let $D$ be an irreducible plane curve. In this article, we first introduce a notion of a quadratic residue curve mod $D$, and study quadratic residue concis $C$ mod an irreducible quartic curve $Q$. As an application, we study a dihedral cover of $P^2$ with branch locus $C+Q$ and give two examples of Zariski pairs as by-products.
INTROGRESIóN GENéTICA DE Bos indicus (BOVIDAE) EN BOVINOS CRIOLLOS COLOMBIANOS DE ORIGEN Bos taurus
SáNCHEZ ISAZA,CARLOS ARTURO; JIMéNEZ ROBAYO,LIGIA MERCEDES; BUENO ANGULO,MARTA LUCíA;
Acta Biológica Colombiana , 2008,
Abstract: this work evidenced, using a cytogenetics approach, that bos indicus exerted a genetic introgression of paternal origin on creole colombian cattle descendent from bos taurus. analysis of chromosome y morphology was carried out in heparinized blood samples of 67 bulls belonging to seven colombian breeds. we report 4 sires belonging to the romosinuano breed (40%) and 10 bulls of the casanare?o breed (100%) with acrocentric y chromosome which is characteristic of bos taurus. this finding indicates a high degree of genetic introgression in these two breeds probably caused by the continuous input of zebu stallions in the colombian creole breeds. in other five creole breeds (blanco orejinegro -bon-, chino santandereano, coste?o con cuernos, hartón del valle and sanmartinero), the bulls had a submetacentric y chromosome characteristic of bos taurus.
INTROGRESIóN GENéTICA DE Bos indicus (BOVIDAE) EN BOVINOS CRIOLLOS COLOMBIANOS DE ORIGEN Bos taurus
SáNCHEZ ISAZA CARLOS ARTURO,JIMéNEZ ROBAYO LIGIA MERCEDES,BUENO ANGULO MARTA LUCíA
Acta Biológica Colombiana , 2008,
Abstract: El presente trabajo evidencia desde el punto de vista citogenético la introgresión genética, de origen paterno, de Bos indicus en ganado criollo colombiano descendiente de Bos taurus. Para este estudio se realizó el análisis cariológico de la morfología del cromosoma Y a partir de muestras de sangre heparinizada de 67 bovinos machos pertenecientes a siete razas criollas colombianas. Se reporta la presencia de cuatro ejemplares pertenecientes a la raza Romosinuano (40%) y 10 toros de la raza Casanare a (100%) con cromosoma Y de tipo acrocéntrico característico de Bos indicus, lo cual estaría evidenciando un alto grado de introgresión genética, en estas dos razas, posiblemente originada por la intensiva introducción de sementales de la raza Cebú en la ganadería criolla colombiana. En las otras cinco razas (Blanco Orejinegro (BON), Chino santandereano, Coste o con cuernos, Hartón del valle y Sanmartinero), los toros presentaron el cromosoma Y submetacéntrico, característico de Bos taurus.
Prevalence of Trypanosoma cruzi and Leishmania chagasi infection and risk factors in a Colombian indigenous population
CORREDOR ARJONA Augusto,ALVAREZ MORENO Carlos Arturo,AGUDELO Carlos Alberto,BUENO Martha
Revista do Instituto de Medicina Tropical de S?o Paulo , 1999,
Abstract: This study was carried out in order to obtain base-line data concerning the epidemiology of American Visceral Leishmaniasis and Chagas? Disease in an indigenous population with whom the government is starting a dwelling improvement programme. Information was collected from 242 dwellings (1,440 people), by means of house to house interviews about socio-economic and environmental factors associated with Leishmania chagasi and Trypanosoma cruzi transmission risk. A leishmanin skin test was applied to 385 people and 454 blood samples were collected on filter paper in order to detect L. chagasi antibodies by ELISA and IFAT and T. cruzi antibodies by ELISA. T. cruzi seroprevalence was 8.7% by ELISA, L. chagasi was 4.6% and 5.1% by IFAT and ELISA, respectively. ELISA sensitivity and specificity for L. chagasi antibodies were 57% and 97.5% respectively, as compared to the IFAT. Leishmanin skin test positivity was 19%. L. chagasi infection prevalence, being defined as a positive result in the three-immunodiagnostic tests, was 17.1%. Additionally, 2.7% of the population studied was positive to both L. chagasi and T. cruzi, showing a possible cross-reaction. L. chagasi and T. cruzi seropositivity increased with age, while no association with gender was observed. Age (p<0.007), number of inhabitants (p<0.05), floor material (p<0.03) and recognition of vector (p<0.01) were associated with T. cruzi infection, whilst age ( p<0.007) and dwelling improvement (p<0.02) were associated with L. chagasi infection. It is necessary to evaluate the long-term impact of the dwelling improvement programme on these parasitic infections in this community.
Feasibility of the use of stillborn piglets in the study of myogenesis and development of vital organs Viabilidade do uso de leit es natimortos nos estudos de miogênese e desenvolvimento de órg os vitais
Aline Alves da Silva,Danyel Bueno Dalto,Eduardo Raele Oliveira,Arturo Pardo Lozano
Semina : Ciências Agrárias , 2012,
Abstract: The objective was to study the feasibility of the use of stillborn piglets in the studies of myogenesis and the development of vital organs. For this, was used litters from genetic Topigs x Danbred of 82 sows between 1st to 7 th order of parturition. In total were monitored 82 parturitions, at the end of the parturitions, all piglets were weighed and identified according to birth order. From this procedure we calculated the average weight of litters with a history of stillbirths. The piglets weighing close to or equal to the average weight of litter, and that similar to the weight of stillborn piglets from the litters, were sacrificed. In total 28 piglets were slaughtered and 30 stillbirths were used. In both classes (stillbirths and live births sacrificed) were collected, the semitendinosus muscle, heart, brain and liver. Data were analyzed using Anova, correlations and regression procedure of SAEG. Results suggested that piglets which born alive have a greater muscular area when compared to stillborn (60. 50 vs. 42.71 ?m). In addition a strong correlation (P < 0. 05; r= 0.63) was found between muscular area and number of muscle fibers. Overall, the results of this study suggest that the stillborn piglets have fewer muscle fibers and can’t replace piglets that born alive in researches about myogenesis and development of vital organs, and sex isn’t an important variable to study for this purpose. Objetivou-se estudar a viabilidade do uso de leit es natimortos nos estudos de miogênese e desenvolvimento de órg os vitais. Utilizou-se leitegadas provenientes da genética Topigs x Danbred de 82 matrizes suínas entre 1a à 7a ordem de parto. No total foram monitorados 82 partos. Ao término dos partos, todos os leit es foram pesados e identificados, de acordo com a ordem de nascimento. A partir deste procedimento foi calculado o peso médio das leitegadas que apresentaram histórico de natimortos. Os leit es que apresentaram peso próximo ou igual ao peso médio da leitegada, e peso semelhante ao dos leit es natimortos provenientes das respectivas leitegadas, foram sacrificados. No total, 28 leit es foram abatidos e 30 natimortos foram utilizados. Em ambas as classes (natimortos e nascidos vivos sacrificados) foram coletados, o músculo semitendinoso, cora o, cérebro e fígado. Os dados foram analisados por ANOVA, correla o e regress o através do programa estatístico SAEG. Os resultados sugerem que os leit es nascidos vivos possuem maior área muscular quando comparado com natimortos (60, 50 vs 42,71 ?m). Além disso, uma forte correla o (P < 0,05; R = 0,63) foi enco
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