Quark Mixing Matrix Studies and Lepton Flavor Violation Searches Using Rare Decays of Kaons

I review recent results from experiments on rare decays of kaons, concentrating on searches for lepton flavor violation (LFV) and on measurements of quark mixing (CKM) matrix elements. The LFV results are the culmination of 15 years of experimentation at Brookhaven National Laboratory and are unlikely to be improved upon soon. The CKM studies derive from measurements of decay rates of charged and neutral kaons into lepton anti-lepton pairs, both with and without a charged or neutral pion. I discuss recent results and prospects for improved measurements that could provide an unambiguous test of the Standard Model explanation for CP violation. This paper is the written version of a talk presented at the Lepton-Photon Conference in August 1999.Comment: Written version of a talk at the 1999 Lepton Photon Conferenc

D0 Dimuon Asymmetry in Bs−BˉsB_s - \bar B_s Mixing and Constraints on New Physics

We study the consequences of the large dimuon asymmetry observed at D0. Physics beyond the standard model (SM) in $B_s-\bar B_s$ mixing is required to explain the data. We first present a detailed analysis for model independent constraints on physics beyond the SM, and then study the implications for theoretical models which modify the SM results in different ways, such as $Z'$ with FCNC and R-parity violating SUSY contributions.Comment: RevTex 13 pages, 6 figures. References added. Modified some discussions. Version to appear in PR

Quantum anisotropic Heisenberg chains with superlattice structure: a DMRG study

Using the density matrix renormalization group technique, we study spin superlattices composed of a repeated pattern of two spin-1/2 XXZ chains with different anisotropy parameters. The magnetization curve can exhibit two plateaus, a non trivial plateau with the magnetization value given by the relative sizes of the sub-chains and another trivial plateau with zero magnetization. We find good agreement of the value and the width of the plateaus with the analytical results obtained previously. In the gapless regions away from the plateaus, we compare the finite-size spin gap with the predictions based on bosonization and find reasonable agreement. These results confirm the validity of the Tomonaga-Luttinger liquid superlattice description of these systems.Comment: 6 pages, 6 figure

Network Interdependency Modeling for Risk Assessment on Built Infrastructure Systems

As modern infrastructures become more interconnected, the decision-making process becomes more difficult because of the increased complexity resulting from infrastructure interdependencies. Simulation and network modeling provide a way to understand system behavior as a result of interdependencies. One area within the asset management literature that is not well covered is infrastructure system decay and risks associated with that decay. This research presents an enhanced version of Haimes\u27 input-output inoperability model (IIM) in the analysis of built infrastructure systems. Previous applications of the IIM characterized infrastructure at the national level utilizing large economic databases. This study develops a three-phased approach that takes component level data stored within geographic information systems (GIS) to provide a metric for network interdependency across a municipal level infrastructure. A multi-layered approach is proposed which leverages the layered data structure of GIS. Furthermore, Monte Carlo simulation using stochastic decay estimates shows how infrastructure risk as a result of interdependency effects changes over time. Such an analysis provides insight to infrastructure asset managers on the impact of policy and strategy decision-making regarding the maintenance and management of their infrastructure systems

A Project Manager\u27s Personal Attributes as Predictors for Success

The purpose of this research was to determine what personal attributes project managers (PMs) possess which leads them to project management success. Numerous attributes are identified in the literature through a variety of methods, but very few studies relate specific qualities to success. The traits identified in the literature were compiled and condensed into seven distinct skills and attributes: leadership ability, communication skill, decision making skill, administrative skill, coping ability, analytical thinking, and technical competence. A survey method was developed which involved the PM, to measure levels of each attribute, and the PM’s supervisor and project data, to provide a level of PM success. PMs and their supervisors from the Air Force Center for Environmental Excellence, a project management firm within the United States Air Force, were invited to participate in the study. Through correlation and regression analysis, a sample of 23 PMs suggest that administrative ability is the single most important trait to possess. Leadership ability emphasizing teamwork, decision making skill with moderate levels of an adaptive decision making style, and moderate levels of technical competence were found to also contribute towards PM success. No conclusions could be drawn on communication skill, analytical thinking, and coping ability

Magnetic behavior of lamellar mnps3 and cdps3 composites with a paramagnetic manganese(iii) macrocyclic guest

Indexación: ScieloSix new composites derived from the intercalation of the MPS3 phases (M = MnII, CdIII) with the macrocyclic manganese(III) complex [MnL(H2O)2].NO3(H2O) (LH2 = Schiff base macrocyclic ligand derived from the condensation of 2-hydroxy-5-methy1-1,3-benzene-dicarbaldehyde and 1,2-diamine-benzene) were obtained by two different synthetic procedures: a conventional and a microwave assisted method. The composites [MnL]0.25K0.15Mn0.80 PS3(H2O)~1.0 (1), and [MnL]0.25K0.15Cd 0. 80PS3(H2O)~0.5 (2) were obtained by the conventional method, after stirring a suspension of the corresponding potassium precursor and the macrocyclic complex for two weeks, while [MnL]0.35K0.15Mn0.80 PS3(H2O)~1.0 (3) and [MnL]0.25K0.15Cd 0. 80PS3(H2O)~0.5 (4) after stirring for four weeks at room temperature. Using a microwave assisted reaction permitted to obtain in a shorter period of time as compared with the conventional method, composites [MnL]0.20K0.15Mn0.80 PS3(H2O)~1.0 (5) and [MnL]0.15K0.15Cd 0. 80PS3(H2O)~0.5 (6). All the M = MnII, MnIII composites show a bulk antiferromagnetic behavior. However, the spontaneous magnetization present at low temperature in the potassium precursor K0.40Mn0.80 PS3(H2O)~1.0 is observable in composite [MnL]0.20K0.15Mn0.80 PS3(H2O)~1.0 (5), while it is completely absent in composites [MnL]0.25K0.15Mn0.80 PS3(H2O)~1.0 (1) and [MnL]0.35K0.15Mn0.80 PS3(H2O)~1.0 (3). Keywords: Intercalation; MPS3 phases; MnIII macrocyclic complex; microwave assisted synthesis; magnetic properties

Self-Assembly Behavior of Amphiphilic Janus Dendrimers in Water: A Combined Experimental and Coarse-Grained Molecular Dynamics Simulation Approach

Indexación: Scopus.Acknowledgments: M.E.E.G. thank the Ph. D. scholarship (251115) from CONACyT. The authors would like to thank: Luis Elizalde-Herrera (CIQA) for his help running the NMR spectra; Gloria Macedo-Raygoza and Miguel J. Beltrán-García (UAG), for their help in the measuring of MALDI-TOF mass spectra; and Maricela Rodríguez-Nieto and Jorge Luis Menchaca (UANL), for their help with the AFM measurements. FDGN thanks to the USA Air Force Office of Scientific Research Awards.Amphiphilic Janus dendrimers (JDs) are repetitively branched molecules with hydrophilic and hydrophobic components that self-assemble in water to form a variety of morphologies, including vesicles analogous to liposomes with potential pharmaceutical and medical application. To date, the self-assembly of JDs has not been fully investigated thus it is important to gain insight into its mechanism and dependence on JDs’ molecular structure. In this study, the aggregation behavior in water of a second-generation bis-MPA JD was evaluated using experimental and computational methods. Dispersions of JDs in water were carried out using the thin-film hydration and ethanol injection methods. Resulting assemblies were characterized by dynamic light scattering, confocal microscopy, and atomic force microscopy. Furthermore, a coarse-grained molecular dynamics (CG-MD) simulation was performed to study the mechanism of JDs aggregation. The obtaining of assemblies in water with no interdigitated bilayers was confirmed by the experimental characterization and CG-MD simulation. Assemblies with dendrimersome characteristics were obtained using the ethanol injection method. The results of this study establish a relationship between the molecular structure of the JD and the properties of its aggregates in water. Thus, our findings could be relevant for the design of novel JDs with tailored assemblies suitable for drug delivery systems. © 2018 by the authors.https://www.mdpi.com/1420-3049/23/4/96

Caracterizacion curricular en la instituci?n educativa Totarco Dinde del municipio de Coyaima

39 P?ginasLa investigaci?n fue de tipo cualitativo, con enfoque hist?rico hermen?utico para comprender los sentidos y pr?cticas en la relaci?n escuela y etnia en las comunidades ind?genas Coyaima ? Tolima. La investigaci?n contemplo cuatro fases: Fase preparatoria, que se inici? a partir de unos referentes te?ricos teniendo en cuenta conceptos etnoeducativos, para enmarcar los procesos ?tnicos, educativos, interculturales, que dieron pauta para la pregunta de investigaci?n. La fase de trabajo de campo, donde se cont? con una poblaci?n, la cual determin? la unidad de an?lisis que particip? dentro del proceso investigativo, con caracter?sticas como la condici?n de etnoeducador, estudiantes y padres de familia, cumpliendo con el par?metro de ser resguardados. La fase anal?tica, que consisti? en la transcripci?n de los datos suministrados por los instrumentos (Gu?as de entrevista y de observaci?n) y las t?cnicas (entrevista semiestructurada, grupo focal y observaci?n participante), apoyados por matrices de codificaci?n de datos en torno a las categor?as de an?lisis; buscando responder a la pregunta investigativa. Y finalmente, se plante? una fase informativa que consisti? en hacer p?blicos los hallazgos de la investigaci?n, a trav?s de la construcci?n del informe final del proyecto y publicaci?n de art?culo individual.ABSTRACT. He research was qualitative, with hermeneutic historical approach to understanding the meanings and practices in school and ethnic relationship in indigenous communities Coyaima - Tolima. The survey involved four phases: Preparatory phase, which started from a theoretical framework considering ethnic education concepts to frame ethnic, educational, intercultural processes, which gave guidelines for the research question. The phase of fieldwork, where it had a population, which determined the analysis unit that participated in the research process, with features such as the condition of etnoeducador, students and parents, meeting the parameter to be protected. The analytical phase, which consisted in transcribing the data supplied by the instruments (interview guides and observation) and techniques (semi-structured interviews, focus groups and participant observation), supported by data coding matrices around categories analysis; looking to answer the research question. And finally, an informative phase was to make public the findings of the investigation was raised through the construction of the final project report and publication of individual item.INTRODUCCI?N 10 1. OBJETIVOS 12 1.1 OBJETIVO GENERAL 12 1.2. OBJETIVOS ESPEC?FICOS 12 2. JUSTIFICACI?N 13 3. PROBLEMATIZACI?N 14 3.1 PREGUNTA GENERAL 14 4. MARCO TE?RICO 15 4.1 CONCEPTO DE ETNOEDUCACI?N 15 4.2 MARCO LEGAL 16 4.3 CONCEPTO DE LA COSMOVISI?N EN LAS COMUNIDADES IND?GENAS 21 4.3.1 Comunitaria y participativa 21 4.3.2 Intercultural y biling?e 21 4.3.3 Flexible y progresiva 22 4.3.4 Rec?proca y productiva 22 4.4 DESCRIPCI?N DE ASPECTOS ANTROPOL?GICOS DE LA COMUNIDAD PIJ?O. 22 4.5 CARACTER?STICAS POBLACIONALES 25 4.5.1 Deficiencias educativas de las comunidades ind?genas 26 4.5.2 La Etnoeducacion como alternativa de desarrollo 27 5. DISE?O METODOLOGICO 28 6. ANALISIS DE LOS RESULTADOS 31 7. CONCLUSIONES 37 RECOMENDACIONES 38 REFERENCIAS 3