Two-Particle Schroedinger Equation Animations of Wavepacket-Wavepacket Scattering (revised)

A simple and explicit technique for the numerical solution of the two-particle, time-dependent Schr\"{o}dinger equation is assembled and tested. The technique can handle interparticle potentials that are arbitrary functions of the coordinates of each particle, arbitrary initial and boundary conditions, and multi-dimensional equations. Plots and animations are given here and on the World Wide Web of the scattering of two wavepackets in one dimension.Comment: 13 pages, 8 figures, animations at http://nacphy.physics.orst.edu/ComPhys/PACKETS

Minimum cost b-matching problems with neighborhoods

In this paper, we deal with minimum cost b-matching problems on graphs where the nodes are assumed to belong to non-necessarily convex regions called neighborhoods, and the costs are given by the distances between points of the neighborhoods. The goal in the proposed problems is twofold: (i) finding a b-matching in the graph and (ii) determining a point in each neighborhood to be the connection point among the edges defining the b-matching. Different variants of the minimum cost b-matching problem are considered depending on the criteria to match neighborhoods: perfect, maximum cardinality, maximal and the a-b-matching problems. The theoretical complexity of solving each one of these problems is analyzed. Different mixed integer non-linear programming formulations are proposed for each one of the considered problems and then reformulated as Second Order Cone formulations. An extensive computational experience shows the efficiency of the proposed formulations to solve the problems under study

Molecular-dynamics-based investigation of scattering path contributions to the EXAFS spectrum: The Cr3¿ aqueous solution case

Extended x-ray absorption fine structure spectra were computed based on molecular-dynamics (MD) struc- tural data of a [ Cr(H2O)6 ]3+ aqueous solution using nonempirical cation-water potentials. An excellent re- production of the experimental spectrum was achieved. A simple estimation of Debye-Waller factors of the multiple-scattering paths is deduced from MD simulations. The influence of the single-scattering path due to the second hydration shell as compared with the multiple-scattering paths within the first hydration shell allows a reasonable determination of the second hydration shell distance R(Cr-OII) within 0.1 Å

Sintomatologia, etiología y algunos factores que inciden en la caída de plántulas de algodonero en Andalucía Occidental

Se describen los resultados de dos prospecciones sobre Caída de plántulas de algodonero efectuadas en 1999 en 28 parcelas con historia de incidencia de la enfermedad en Andalucía occidental. En la prospección temprana se recogieron 401 plantas de rodales con problemas y se encontró una mayor incidencia de Rhizoctonia solani. En la tardía se recogieron 976 plantas al azar y Thielaviopsis basteóla fue el que se encontró con más frecuencia, notándose un incremento de la importancia de este hongo en los suelos arcillosos al sur de Sevilla. Se ha estudiado la sintomatologia presente y encontrado una asociación entre los aislamientos de R. solani y la muerte de las plántulas y entre T. basicola y las necrosis más oscuras y negras, comprobándose además que un elevado número de síndromes estuvieron causados por agentes abióticos. Se presentan datos previos de las relaciones entre la frecuencia de aislamientos de estos patógenos y algunas prácticas culturales como fueron el quemado de los restos del cultivo anterior y las dosis del abonado de fondo. En este trabajo se realizaron análisis de la germinación de la semilla sembrada por los agricultores y se hacen consideraciones sobre el "vigor" de la semilla empleadaResults of two cotton surveys on cotton damping-off realized in west Andalucía (Spain) are described. Twenty eight cotton fields known as disease prone were sampled. At first survey 401 plants were collected from infected areas of the fields and Rhizoctonia solani was the fungus most frequently recovered. One month later, the same fields were randomly sampled and 976 plants were collected founding a higher incidence of Thielaviopsis basicola, specially on clay soils southern Seville. Plants were classified by symptoms and related to isolated fungi. R. solani was associated with seedling death and T. basicola with dark brown or black necrosis. A high percentage of syndromes had an abiotic origin. Preliminary conclusions on relationships between both fungi and fertilization management and previous crops stubble are presented. Germination of seeds planted by farmers was studied and some considerations about their vigor are made

Neocortical tissue recovery in severe congenital obstructive hydrocephalus after intraventricular administration of bone marrow-derived mesenchymal stem cells

BACKGROUND: In obstructive congenital hydrocephalus, cerebrospinal fluid accumulation is associated with high intracranial pressure and the presence of periventricular edema, ischemia/hypoxia, damage of the white matter, and glial reactions in the neocortex. The viability and short time effects of a therapy based on bone marrow-derived mesenchymal stem cells (BM-MSC) have been evaluated in such pathological conditions in the hyh mouse model. METHODS: BM-MSC obtained from mice expressing fluorescent mRFP1 protein were injected into the lateral ventricle of hydrocephalic hyh mice at the moment they present a very severe form of the disease. The effect of transplantation in the neocortex was compared with hydrocephalic hyh mice injected with the vehicle and non-hydrocephalic littermates. Neural cell populations and the possibility of transdifferentiation were analyzed. The possibility of a tissue recovering was investigated using 1H High-Resolution Magic Angle Spinning Nuclear Magnetic Resonance (1H HR-MAS NMR) spectroscopy, thus allowing the detection of metabolites/osmolytes related with hydrocephalus severity and outcome in the neocortex. An in vitro assay to simulate the periventricular astrocyte reaction conditions was performed using BM-MSC under high TNFα level condition. The secretome in the culture medium was analyzed in this assay. RESULTS: Four days after transplantation, BM-MSC were found undifferentiated and scattered into the astrocyte reaction present in the damaged neocortex white matter. Tissue rejection to the integrated BM-MSC was not detected 4 days after transplantation. Hyh mice transplanted with BM-MSC showed a reduction in the apoptosis in the periventricular neocortex walls, suggesting a neuroprotector effect of the BM-MSC in these conditions. A decrease in the levels of metabolites/osmolytes in the neocortex, such as taurine and neuroexcytotoxic glutamate, also indicated a tissue recovering. Under high TNFα level condition in vitro, BM-MSC showed an upregulation of cytokine and protein secretion that may explain homing, immunomodulation, and vascular permeability, and therefore the tissue recovering. CONCLUSIONS: BM-MSC treatment in severe congenital hydrocephalus is viable and leads to the recovery of the severe neurodegenerative conditions in the neocortex. NMR spectroscopy allows to follow-up the effects of stem cell therapy in hydrocephalus.España Instituto Carlos III , PI15/00619 (to AJJ), PI19/00778 (to AJJ and PPG), PI15/00796, and PI18/01557España Ministerio de Educación, Cultura y Deporte FPU13/02906España, Ministerio de Economía y Competitividad RYC-2014-16980España, FEDER Andalucía y Universidad de Málaga UMA18-FEDERJA-27

Actividades y resultados del Plan de Innovación Docente para la Participación de Empresas en la Docencia

Participación de Empresas en la Docencia (abreviado como ParED) es el nombre del plan de innovación docente desarrollado durante la segunda mitad del año 2016, en la E.T.S. de Ingeniería Informática de la Universidad de Sevilla, con el objetivo de poner en marcha iniciativas que permitieran adaptar la docencia universitaria con la realidad de las empresas. El objetivo de este artículo es exponer las actividades desarrolladas y realizar un análisis de los resultados obtenidos así como analizar los problemas que surgieron y las lecciones aprendidas de esta experiencia.Participation of Business in Teaching (abbreviated as ParED) is the name of an educational innovation plan. This plan was developed during the second half of t 2016. The goal of ParED was to align university teaching with the reality of the Business. This paper outlines the activities carried out and analyses the results of these activities. This paper also introduces the problems that have arisen and the lessons the authors learned from them.Este trabajo también ha sido apoyado por el proyecto Pololas (TIN2016-76956-C3-2-R) y por la Red SoftPLM (TIN2015-71938-REDT) del Ministerio de Economía y Competitividad

La acústica submarina y su desarrollo desde la creación del Instituto de Acústica

PACS: 43.30.Xm; 43.30.Yj; 43.30.Vh; 43.30.Nb; 43.30.Ma.-- Publicado en el Vol. XXXI, núm. 3-4, tercer y cuarto trimestre 2000 de la Revista de Acústica: Número especial dedicado al XXV Aniversario del Instituto de Acústica del C.S.I.C.[ES] La Acústica Submarina fue una de las líneas de la Acústica que se desarrollan en el Instituto desde los primeros tiempos. Este trabajo describe como se inició, cómo se desarrolló y el estado actual de este campo.[EN] Underwater Acoustics was one line of Acoustics first developped at the Instituto de Acústica. This paper presents a description of the activities in the underwater field, done since 1969, when the Underwater Tank was installed, up to the present times.Peer reviewe