Solution of the 1d Schrödinger Equation for a Symmetric Well

We suggest a mathematical potential well with spherical symmetry and apply to the 1d Schrödinger equation. We use some well known techniques as Stationary Perturbation Theory and WKB to gain insight about the solutions and compare them each other. Finally, we solve the 1d Schrödinger equation using a numerical approach with the so-called Numerov technique for comparison. This can be a good exercise for undergrad students to grasp the above cited techniques in a quantum mechanics course

Ambulatory care, insurance, and avoidable emergency department utilization in North Carolina

Objective: To examine whether and how avoidable emergency department (ED) utilization is associated with ambulatory or primary care (APC) utilization, insurance, and interaction effects. Design and sample: A cross-sectional analysis of electronic health records from 70,870 adults residing in Mecklenburg County, North Carolina, who visited an ED within a large integrated healthcare system in 2017. Methods: APC utilization was measured as total visits, categorized as: 0, 1, and > 1. Insurance was defined as the method of payment for the ED visit as: Medicaid, Medicare, private, or uninsured. Avoidable ED utilization was quantified as a score (aED), calculated as the sum of New York University Algorithm probabilities multiplied by 100. Quantile regression models were used to predict the 25th, 50th, 75th, 95th, and 99th percentiles of avoidable ED scores with APC visits and insurance as predictors (Model 1) and with an interaction term (Model 2). Results: Having >1 APC visit was negatively associated with aED at the lower percentiles and positively associated at higher percentiles. A higher aED was associated with having Medicaid insurance and a lower aED was associated with having private insurance, compared to being uninsured. In stratified models, having >1 APC visit was negatively associated with aED at the 25th percentile for the uninsured and privately insured, but positively associated with aED at higher percentiles among the uninsured, Medicaid-insured, and privately insured. Conclusions: The association between APC utilization and avoidable ED utilization varied based on segments of the distribution of ED score and differed significantly by insurance type

La autoestima de los estudiantes del 5° y 6° grado del nivel primario de la I.E. N° 20955-25 "Mercedes Cabanillas Bustamante" del distrito de Santa Eulalia - Huarochirí, en el año 2013

La presente tesis titulada La autoestima de los estudiantes del 5° y 6° grado del nivel primario de la I. E. Nº 20955-25 “Mercedes Cabanillas Bustamante” del distrito de Santa Eulalia - Huarochirí, en el año 2013, estudio desarrollado con el objetivo de identificar el nivel de autoestima que presentan los estudiantes del 5° y 6° grado del nivel primario de la Institución Educativa Nº 20955-25 “Mercedes Cabanillas Bustamante” del distrito de Santa Eulalia – Huarochirí, en el año 2013. En ese sentido, hemos seleccionado una población de 75 estudiantes del 5º y 6° grado del nivel primario, siendo la población la misma muestra. La forma en que fueron recogidos los datos fue mediante la Observación Sistemática y la aplicación del Inventario de Autoestima de Coopersmith (SEI), versión escolar; asimismo se presentan los datos que utilizamos en los gráficos de barras, las tablas de frecuencia y porcentaje. Los principales hallazgos nos llevaron a concluir que los estudiantes del 5° y 6° grado de la Institución Educativa Nº 20955 – 25 “Mercedes Cabanillas Bustamante” del distrito de Santa Eulalia – Huarochirí, en el año 2013, poseen una autoestima medianamente desarrollada

Very high rotational frequencies and band termination in 73Br

Rotational bands in 73Br have been investigated up to spins of 65/2 using the EUROBALL III spectrometer. One of the negative-parity bands displays the highest rotational frequency 1.85 MeV reported to date in nuclei with mass number greater than 25. At high frequencies, the experimental dynamic moment of inertia for all bands decrease to very low values, indicating a loss of collectivity. The bands are described in the configuration-dependent cranked Nilsson-Strutinsky model. The calculations indicate that one of the negative-parity bands is observed up to its terminating single-particle state at spin 63/2. This result establishes the first band termination case in the A = 70 mass region.Comment: 6 pages, 6 figures, submitted to Phys. Rev. C as a Rapid Communicatio

Level structure of 69Se

15 págs.; 9 figs.; 5 tabs. ; PACS number(s): 23.20.Lv, 21.10.Re, 27.50.1e, 21.60.2nExcited levels in 69Se have been studied using the 40Ca(32S,2pn)69Se reaction at 95- and 105-MeV beam energy, γ rays have been detected with the EUROBALL spectrometer operated in conjunction with the neutron wall and the charged-particle detector array EUCLIDES. New level sequences with positive and negative parities have been identified from n-γγ and n-γγγ coincidences. Spins have been assigned to many of the levels on the basis of angular distribution and directional correlation measurements. Excitation energies of the positive-parity yrast band and the branching ratios of its decay are compared with the predictions of the rigid triaxial rotor plus particle model. ©2004 The American Physical SocietyA. J. acknowledges financial support from the Deutsche Forschungsgemeinshaft (DPG) within the Heisenberg program. This work was supported by BMBF under Contract Nos. 06 OK 958 and 06 GÖ 951 and the EUROVIV Contract No. HPRI-CT-1999-000783.Peer Reviewe

Four-quasiparticle alignments in 66Ge

13 págs.; 7 figs.; 1 tab. ; PACS number(s): 23.20.Lv, 21.10.Re, 25.70.Hi, 27.50.1eThe neutron-deficient nucleus 66Ge was populated at high spin in two experiments using the reaction 40Ca(32S, α2p) at beam energies of 105 and 95 MeV. In the first experiment, a self-supporting 40Ca target was used, while a gold-backed target of similar thickness was used in the second experiment, γ rays were detected with the EUROBALL array, combined with the charged-particle detector array EUCLIDES and the Neutron Wall. The level scheme of 66Ge was extended up to E ≈ 18 MeV and Iπ = (23-). Above angular momentum 10+, we found two sequences, connected by energetically staggered ΔI = 1 M 1 transitions. The total Routhian surface calculations describe 66Ge at lower spins as a γ-soft nucleus having a moderate deformation of β2 ≈ 0.23, while a triaxial deformation is predicted for the band structures above Iπ = 10+. To our knowledge, this is the first observation of staggered Ml transitions in a deformed four-quasiparticle π(g9/2 2) ν(g9/2 2) structure. ©2003 American Physical SocietyThis work was supported by BMBF 06 GO¨ 951 and TMR/LSF Contract No. HPRI-CT-1999-00078. The authors are indebted to the crew of the VIVITRON accelerator and the EUROBALL facility at IReS for their dedicated efforts and cooperation.Peer Reviewe

Analytical and numerical analyses of the micromechanics of soft fibrous connective tissues

State of the art research and treatment of biological tissues require accurate and efficient methods for describing their mechanical properties. Indeed, micromechanics motivated approaches provide a systematic method for elevating relevant data from the microscopic level to the macroscopic one. In this work the mechanical responses of hyperelastic tissues with one and two families of collagen fibers are analyzed by application of a new variational estimate accounting for their histology and the behaviors of their constituents. The resulting, close form expressions, are used to determine the overall response of the wall of a healthy human coronary artery. To demonstrate the accuracy of the proposed method these predictions are compared with corresponding 3-D finite element simulations of a periodic unit cell of the tissue with two families of fibers. Throughout, the analytical predictions for the highly nonlinear and anisotropic tissue are in agreement with the numerical simulations

Necesidades del sector empresarial de Chimbote para el período 2017-2021

La presente investigación tiene como propósito, determinar las necesidades del sector empresarial de Chimbote, para el periodo 2017 - 2021, esta investigación constituye una herramienta de gran utilidad, que nos ha permitido iniciar la búsqueda de un acercamiento entre la universidad y las empresas, a fin de solucionar su problemática en el campo de la producción de bienes y servicios así como alcanzar el mejor posicionamiento dentro de los mercados exigentes y altamente competitivos, buscando siempre la mejora de la calidad y la optimización de sus recursos. El estudio corresponde a un diseño y tipo de investigación no experimental, exploratorio-transaccional y hemos considerado una muestra de 20 l empresas, que desarrollan sus actividades en Chimbote, la misma que ha sido proporcionada por el Ministerio de Trabajo, sin precisar la población, y que corresponde al año 2015. Los resultados nos permiten conocer entre otros, que los profesionales a requerir por el sector empresarial, para los periodos. 2017, 2018, 20 l 9, 2020 y 2021, serán contadores, administradores, ingenieros y docentes, así como que la relación entre las universidades locales de Chimbote y las empresas es débil y que las empresas no tienen un buen posicionamiento en el mercado de Chimbote.Trabajo de investigació

First Results on In-Beam gamma Spectroscopy of Neutron-Rich Na and Mg Isotopes at REX-ISOLDE

After the successful commissioning of the radioactive beam experiment at ISOLDE (REX-ISOLDE) - an accelerator for exotic nuclei produced by ISOLDE - first physics experiments using these beams were performed. Initial experiments focused on the region of deformation in the vicinity of the neutron-rich Na and Mg isotopes. Preliminary results show the high potential and physics opportunities offered by the exotic isotope accelerator REX in conjunction with the modern Germanium gamma spectrometer MINIBALL.Comment: 7 pages, RNB6 conference contributio