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Search Results: 1 - 10 of 10568 matches for " Benjamin Jaramillo Avila "
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Four-boson bound states from a functional renormalisation group
Benjamin Jaramillo Avila,Michael C. Birse
Physics , 2015, DOI: 10.1103/PhysRevA.92.023601
Abstract: We use the functional renormalisation group to study the spectrum of three- and four-body states in bosonic systems around the unitary limit. Our effective action includes all energy-independent contact interactions in the four-atom sector and we introduce a running trimer field to eliminate couplings that involve the atom-atom-dimer channel. The results show qualitatively similar behaviour to those from exact approaches. The truncated action we use leads to overbinding of the two four-body states seen in those treatments. It also generates a third state, although only for a very narrow range of two-body scattering lengths.
Universal behaviour of four-boson systems from a functional renormalisation group
Benjamin Jaramillo Avila,Michael C. Birse
Physics , 2013, DOI: 10.1103/PhysRevA.88.043613
Abstract: We apply a functional renormalisation group to systems of four bosonic atoms close to the unitary limit. We work with a local effective action that includes a dynamical trimer field and we use this field to eliminate structures that do not correspond to the Faddeev-Yakubovsky equations. In the physical limit, we find three four-body bound states below the shallowest three-body state. The values of the scattering lengths at which two of these states become bound are in good agreement with exact solutions of the four-body equations and experimental observations. The third state is extremely shallow. During the evolution we find an infinite number of four-body states based on each three-body state which follow a double-exponential pattern in the running scale. None of the four-body states shows any evidence of dependence on a four-body parameter.
Primer registro de Oncopoduridae (Collembola: Entomobryomorpha) para Colombia
AVILA A.,DANIEL; JARAMILLO C.,YENDA;
Revista Colombiana de Entomología , 2011,
Abstract: the family oncopoduridae (entomobryomorpha: arthropleona), represented by the species harlomillsia oculata, is reported for the first time in colombia. the samples were collected in blackberry crops and kikuyu grass pastures belonging to the andean high forest of the eastern cordillera at 2600 m elevation.
Primer registro de Oncopoduridae (Collembola: Entomobryomorpha) para Colombia First report of Oncopoduridae (Collembola: Entomobryomorpha) from Colombia
DANIEL AVILA A.,YENDA JARAMILLO C.
Revista Colombiana de Entomología , 2011,
Abstract: Se registra por primera vez para Colombia la familia Oncopoduridae (Entomobryomorpha: Arthropleona) representada por la especie Harlomillsia oculata. Los ejemplares se recolectaron en cultivo de mora y pastizal de kikuyo circunscritos a bosque alto andino de la cordillera oriental a 2600 msnm de altitud. The family Oncopoduridae (Entomobryomorpha: Arthropleona), represented by the species Harlomillsia oculata, is reported for the first time in Colombia. The samples were collected in blackberry crops and kikuyu grass pastures belonging to the Andean high forest of the eastern cordillera at 2600 m elevation.
Asimetrías de CP en Mesones B y Física Nueva
David Delepine,Carlos A. Ramirez,Benjamín Raziel Jaramillo Avila
Acta Universitaria , 2012,
Abstract: La colaboración BELLE reporto violación de CP (C, conjugación de carga y P, paridad) en decaimientos directos de mesones B en mesones K y piones. Pero las asimetrías de CP medidas en el decaimiento del y en el decaimiento delresultan muy diferentes una del otro cuando se esperaría a dentro del modelo que unifica las interacciones electromagnéticas, débiles y fuertes que las asimetrías de CP deberían tener el mismo signo y un valor muy cercana. En este trabajo, se estudia cómo se tiene que modificar el modelo estándar de las interacciones fundamentales para explicar las observaciones de BELLE. Nuestro análisis es modelo-independiente. Y demostramos que no se puede reproducir los resultados de BELLE solamente modificando la fase de los coeficientes de Wilson que describen esos procesos.
Use of Saccharomyces cerevisiae Cell Walls in Diets for Two Genetic Strains of Laying Hens Reared in Floor and Cages
BenjamIn Fuente MartInez,Alexis Arias Contreras,Ernesto Avila Gonzalez
International Journal of Poultry Science , 2010,
Abstract: Two trials were carried out to evaluate the productive response in Bovans white hens housed in cages and Isa Brown hens reared in floor fed with sorghum + soybean meal supplemented with Saccharomyces cerevisiae Cell Walls (CW) growth promoters or zinc bacitracin in the diets. In the first one, 216 Bovans hens, 45 weeks old, reared in pens, were allocated in a completely randomized design in three treatments with 6 replicates of 12 hens each one. In the second one, 600 Isa Brown hens, 43 weeks old, were used and allocated in floor with straw litter and three treatments with 4 replicates of 50 hens each one. For both trials, the following treatments were used: 1.- Diet without growth promoter, 2.-As 1 + Zinc bacitracin (30 ppm), 3.- As 1 + CW (500 ppm). Water and feed were given ad libitum. Feed intake records, egg production, egg weight, egg mass per bird per day, dirty egg and feed conversion ratio, were taken during 14 weeks. At the end of the trials, to the variables above mentionate, an analysis of time repeated observations was carried out. Results indicated for Trial 1, difference among treatments (p<0.05), with higher percentage of dirty eggs the treatment without promoter. In Trial 2, there was better egg production, feed conversion ratio, egg mass and less dirty eggs with CW, being these results similar to those of Zinc bacitracin treatment (p<0.05) and higher than treatment without promoter. The results obtained show a promoter effect on the production of hens reared in floor, when CW or zinc bacitracin were included in the diet.
Atomistic simulations of amorphous polymers in the cloud with PolymerModeler
Benjamin P. Haley,Chunyu Li,Nathaniel Wilson,Eugenio Jaramillo,Alejandro Strachan
Physics , 2015,
Abstract: Molecular dynamics (MD) simulations enable the description of ma- terial properties and processes with atomistic detail by numerically solv- ing the time evolution of every atom in the system. We introduce Poly- merModeler, a general-purpose, online simulation tool to build atomistic structures of amorphous polymers and perform MD simulations on the re- sulting configurations to predict their thermo-mechanical properties. Poly- merModeler is available, free of charge, at nanoHUB.org via an interactive web interface, and the actual simulations are performed in the cloud us- ing nanoHUB.org resources. Starting from the specification of one or more monomers PolymerModeler builds the polymer chains into a simulation cell with periodic boundary conditions at the desired density. Monomers are added sequentially using the continuous configuration bias direct Monte Carlo method, and copolymers can be created describing the desired se- quence of monomers. PolymerModeler also enables users to perform MD simulations on the structures created by the builder using the Dreiding force field and Gasteiger partial atomic charges. We describe the force field im- plementation and the various options for the MD simulations that use the LAMMPS simulator. PolymerModeler MD simulations for a PMMA sam- ple show good structural agreement with experiments and are in good agree- ment with simulations obtained with commercial software.
Detection of Behavior Patterns in Single Women in Mexico  [PDF]
Edgardo Ruiz, Argelia Avila
Psychology (PSYCH) , 2013, DOI: 10.4236/psych.2013.411129
Abstract:

The proposal of this work is to detect the existence of patterns of interactive sequential discursive behavior in three single Mexican adult women from retrospective analysis of the interview between them and the interviewer. The applied methodology was observational. It was developed iteratively and thoroughly, a category system as an instrument of observation, and then it was undergone a recategorization process. The number of sessions observed was three, of three hours a duration. Intersessional sequential analysis was used through the SDIS-GSEQ software. Thus we find that the first significant categories in order of occurrence are: Being for her self, Paradox and Independence. The following in significant probability of occurrence position are: Dependency, self-satisfaction, Complementary, Comprehension andNormal. Finally, the categories that are inhibitory occurrence probabilistically negative are: Responsible, Myself, Self-understanding. Finding out these women are learning to live for themselves within a process of emancipation from their families and social structures.

CARACTERIZACIóN DE LA MATERIA ORGáNICA DEL HORIZONTE SUPERFICIAL DE UN ANDISOL HIDROMóRFICO DEL ORIENTE ANTIOQUE?O (COLOMBIA)
Jaramillo Jaramillo,Daniel Francisco;
Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales , 2011,
Abstract: a study was carried out to determine the soil organic matter content and characteristics from a surface horizon of an aquatic moisture regime andisol. most of the mos was constituted by nonhumic organic materials with low degree of evolution. the content of organic-mineral complexes in this surface horizon was low. the a horizon exhibited a considerable thickness (31.2 cm), dark color, high mos (17.65 %), higher content of humic acids than fulvic acids, low e4/e6 ratio (3.55) and low im (1615). the humic acids showed low values of δlog k (0.54) and rf (17.58). the humic fraction of the mos was constituted by high molecular weight humic acids that had low degree of both polymerization and condensation of aromatic compounds. the humic acids of all samples corresponded to the p-type, mostly po-type. the accumulation and limited evolution of mos was seems to be associated with the wet cold weather, restricted soil drainage and relief of field.
VARIABILIDAD ESPACIAL DE LAS PROPIEDADES áNDICAS DE UN ANDISOL HIDROMóRFICO DEL ORIENTE ANTIOQUE?O (COLOMBIA)
Jaramillo Jaramillo,Daniel Francisco;
Revista Facultad Nacional de Agronomía, Medellín , 2009,
Abstract: the spatial variability of some andic properties of the surface horizon in an andisol with aquic moisture regime was studied. most of the properties presented high variability and asymmetry, and strong spatial tendency in their distribution values. few variables presented spatial variability but, it was high and of short range where it was presented.
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