Models with three Higgs doublets in the triplet representations of A(4) or S-4

We consider the quark sector of theories containing three scalar SU(2)(L) doublets in the triplet representation of A(4) (or S-4) and three generations of quarks in arbitrary A(4) (or S-4) representations. We show that for all possible choices of quark field representations and for all possible alignments of the Higgs vacuum expectation values that can constitute global minima of the scalar potential, it is not possible to obtain simultaneously nonvanishing quark masses and a nonvanishing CP-violating phase in the Cabibbo-Kobayashi-Maskawa quark mixing matrix. As a result, in this minimal form, models with three scalar fields in the triplet representation of A(4) or S-4 cannot be extended to the quark sector in a way consistent with experiment

Neutrinos and the matter-antimatter asymmetry in the Universe

The discovery of neutrino oscillations provides a solid evidence for nonzero neutrino masses and leptonic mixing. The fact that neutrino masses are so tiny constitutes a puzzling problem in particle physics. From the theoretical viewpoint, the smallness of neutrino masses can be elegantly explained through the seesaw mechanism. Another challenging issue for particle physics and cosmology is the explanation of the matter-antimatter asymmetry observed in Nature. Among the viable mechanisms, leptogenesis is a simple and well-motivated framework. In this talk we briefly review these aspects, making emphasis on the possibility of linking neutrino physics to the cosmological baryon asymmetry originated from leptogenesis.Comment: 8 pages, 1 table, 1 figure; Based on talk given at the Symposium STARS2011, 1 - 4 May 2011, Havana, Cuba; to be published in the Proceeding

Limited Stop Services Design Considering Variable Dwell Time and Operating Capacity Constraints

This article proposes an optimization model to set frequencies, vehicle capacities, required fleet and the stops serving each route along a transit corridor which minimize the total user and operating costs. The optimization problem is solved by applying the ?Black Hole? algorithm, which imitates the movement of stars (solutions), towards a black hole (Best solution). The main contributions of the model are based on incorporating variable dwell times depending on bus stop demand not only to the passenger perceived journey times but also to the bus cycle times and on considering capacity constraints in both vehicles and bus tops. This led to a more accurate and realistic operating times and user perceived journey times. The application of the model to two case studies and the sensitivity analysis carried out demonstrate that for low levels of demand, constant dwell times can be assumed but being these times different between the different stops of the corridor, considering their demand. However, with high level of demand the difference found in operating costs and travel times strongly recommend incorporating variable dwell times in the model in order to achieve a more realistic design of transit corridor strategies

Unifying gauge couplings at the string scale

Using the current precision electroweak data, we look for the minimal particle content which is necessary to add to the standard model in order to have a complete unification of gauge couplings and gravity at the weakly coupled heterotic string scale. We find that the addition of a vector-like fermion at an intermediate scale and a non-standard hypercharge normalization are in general sufficient to achieve this goal at two-loop level. Requiring the extra matter scale to be below the TeV scale, it is found that the addition of three vector-like fermion doublets with a mass around 700 GeV yields a perfect string-scale unification, provided that the affine levels are $(k_Y, k_2 ,k_3)=(13/3, 1, 2)$, as in the $SU(5) \times SU(5)$ string-GUT. Furthermore, if supersymmetry is broken at the unification scale, the Higgs mass is predicted in the range 125 GeV - 170 GeV, depending on the precise values of the top quark mass and $\tan \beta$ parameter.Comment: 11 pages, 4 eps figures, using jpconf style, talk given at CORFU2005, RTN meeting ``The Quest for Unification: Theory Confronts Experiment'', 11 - 18 September 2005, Corfu, Greec

Criterios de implementación ISO 14000:2015 Caso Estudio Sector Producción Derivados Lácteos.

Criterios de implementación ISO 14000:2015 Caso Estudio Sector Producción Derivados Lácteos.A partir de la Revisión Ambiental Inicial – RAI, se identifican las distintas fases del proceso productivo para determinar con exactitud en cuál de estas se desarrollan actividades susceptibles de generar impactos; la fase de análisis involucra la elaboración de la matriz de aspectos e impactos ambientales, determinar el alcance del sistema de gestión ambiental enfocado desde la perspectiva de cuestiones externas e internas, así como las necesidades y expectativas de las partes interesadas, la matriz legal permite identificar el estado de cumplimiento de la normas ambientales vigentes y aplicables a la empresa.The different phases of the productive process are identified to determine exactly which of these activities are likely to generate impacts; the analysis phase involves the elaboration of the matrix of environmental aspects and impacts, determining the scope of the environmental management system focused from the perspective of external and internal issues, as well as the needs and expectations of the interested parties, the legal matrix allows identifying the state of compliance with the environmental regulations in force and applicable to the company. Keywords: regulations, environment, dairy production, quality, management, environmental aspects, environmental impacts

Carga cognitiva y niveles de psicopatía: una evaluación de su relación en las respuestas frente a dilemas deontológicos y utilitaristas respecto al juicio moral

Trabajo de InvestigaciónEl objetivo del estudio fue explicar el tipo de respuesta (deontológica, utilitarista) según la carga cognitiva y controlar el efecto de los niveles de psicopatía, en personas estudiantes de pregrado de la Universidad Católica de Colombia. La presente investigación es de tipo clasifica en un diseño experimental transaccional o transversal descriptivo, debido a la recolección de datos y de variables en un único momento, aplicada a 54 estudiantes que harán parte de la investigación. La prueba se realizó con el uso de instrumentos como: hoja de presentación, consentimiento informado, Software con dilemas morales y pruebas de tipo cognitivo, hoja con 3 preguntas de pensamiento reflexivo, y test de psicopatía. Posteriormente se llevó a cabo un análisis de datos con la clasificación de los resultados obtenidos estableciendo diferencias y comparaciones de en las respuestas a los juicios morales de tipo deontológico y utilitarista respecto a la carga cognitiva. Una vez obtenidos los datos se realiza un análisis de los resultados, con el objetivo de comprobar la normalidad de las variables de la investigación que en este caso eran los dilemas morales. Finalmente, se destaca el aporte sobre la influencia de la carga cognitiva en la respuesta de tipo utilitarista y deontológica de igual forma, se logró identificar los resultados sobre el tiempo de reacción a cada una de las respuestas de cada uno de los participantes universitarios entre los 18 y 30 años de edad de la Universidad Católica de Colombia. .1. Resumen. 2. Antecedentes teoricos y empiricos. 3. Justificación y planteamiento del problema de investigación. 4. Objetivos. 5. Variables. 6. Método. 7. Aspectos éticos. 8. Resultados. 9. Discusión. 10. Referencias. 11. ApéndicesPregradoPsicólog

Structural remodeling and rotational activity in persistent/long-lasting atrial fibrillation: gender-effect differences and impact on post-ablation outcome

Background: Structural and post-ablation gender differences are reported in atrial fibrillation (AF). We analyzed the gender differences in structural remodeling and AF mechanisms in patients with persistent/long-lasting AF who underwent wide area circumferential pulmonary vein isolation (WACPVI). Materials and Methods: Ultra-high-density mapping was used to study atrial remodeling and AF drivers in 85 consecutive patients. Focal and rotational activity (RAc) were identified with the CartoFinder system and activation sequence analysis. The impact of RAc location on post-ablation outcomes was analyzed. Results: This study included 64 men and 21 women. RAc was detected in 73.4% of men and 38.1% of women (p = 0.003). RAc patients had higher left atrium (LA) voltage (0.64 ± 0.3 vs. 0.50 ± 0.2 mV; p = 0.01), RAc sites had higher voltage than non-RAc sites 0.77 ± 0.46 vs. 0.53 ± 0.37 mV (p < 0.001). Women had lower LA voltage than men (0.42 vs. 0.64 mV; p < 0.001), including pulmonary vein (PV) antra (0.16 vs. 0.30 mV; p < 0.001) and posterior wall (0.34 vs. 0.51 mV; p < 0.001). RAc in the posterior atrium was recorded in few women (23.8 vs. 54.7% in men; p = 0.014). AF recurrence rate was higher in patients with RAc outside WACPVI than those with all RAc inside WACPVI or no RAc (63.4 vs. 11.1 and 31.0%; p = 0.008 and p = 0.01). Comparison of selected patients using propensity score matching confirmed lower atrial voltage (0.4 ± 0.2 vs. 0.7 ± 0.3 mV; p = 0.007) and less RAc (38 vs. 75%; p = 0.02) in women. Conclusion: Women have shown more advanced structural remodeling at ablation, which is associated with a lower incidence of RAc (usually located outside the WACPVI). These findings could explain post-ablation gender differences.This study was supported by the Instituto de Salud Carlos III, Madrid, Spain (PI18/01895 and DTS21/00064), Red de Terapia Celular from the Instituto de Salud Carlos III, Madrid, Spain (RD16/0011/0029), Ricors "Red de Investigación Cooperativa Orientada a Resultados en Salud" RICORS TERAV (RD21/0017/0002), and the Sección del Ritmo de la Sociedad Española de Cardiología (Grant: Beca de la Asociacion del Ritmo para formación en investigacion post-residencia en centros españoles de la Sección del Ritmo de la Sociedad Española de Cardiología), Madrid, Spain