Extended WKB method, resonances and supersymmetric radial barriers

Semiclassical approximations are implemented in the calculation of position and width of low energy resonances for radial barriers. The numerical integrations are delimited by t/T<<8, with t the period of a classical particle in the barrier trap and T the resonance lifetime. These energies are used in the construction of `haired' short range potentials as the supersymmetric partners of a given radial barrier. The new potentials could be useful in the study of the transient phenomena which give rise to the Moshinsky's diffraction in time.Comment: 12 pages, 4 figures, 3 table

Structure and genetic diversity in wild and cultivated populations of Zapote mamey (Pouteria sapota, Sapotaceae) from southeastern Mexico: its putative domestication center

Tropical fruit trees are an important component of the human diet; however, little is known about their genetic diversity levels. Zapote mamey (Pouteria sapota) is a tree native to southeastern Mexico and Central America, and Mexico is the leading producer in the world. Studies of the genetic diversity of Zapote mamey have been based on cultivated materials using morphological and biochemical characterization or dominant molecular markers. To gain a deeper understanding about the conservation status of Zapote mamey in its center of origin and domestication, we collected 188 individuals from eight wild and five cultivated populations in southeastern Mexico and characterized them using eight microsatellite loci. STRUCTURE, 3D-PCoA, and neighbor-joining analyses showed three groups in the wild gene pool and one group in the cultivated gene pool. FST values were significant between wild and cultivated gene pools, among the four groups observed and among the 13 populations collected (0.13, 0.25, and 0.36, respectively). Overall, we found low levels of genetic diversity (A = 2.77, HO = 0.29, HE = 0.39), permutation tests did not show significant differences between wild and cultivated gene pools. The Garza–Williamson index showed low values in both gene pools (wild = 0.16, cultivated = 0.11) and the Bottleneck program indicated a decrease in genetic diversity in both gene pools (wild, P = 0.027; cultivated, P = 0.054); both analyses suggest a potential genetic bottleneck within this species. This study can help to generate adequate sampling techniques and to develop effective management strategies for Zapote mamey of southeastern Mexico

Beyond conventional factorization: Non-Hermitian Hamiltonians with radial oscillator spectrum

The eigenvalue problem of the spherically symmetric oscillator Hamiltonian is revisited in the context of canonical raising and lowering operators. The Hamiltonian is then factorized in terms of two not mutually adjoint factorizing operators which, in turn, give rise to a non-Hermitian radial Hamiltonian. The set of eigenvalues of this new Hamiltonian is exactly the same as the energy spectrum of the radial oscillator and the new square-integrable eigenfunctions are complex Darboux-deformations of the associated Laguerre polynomials.Comment: 13 pages, 7 figure

Mensajes de texto para el control glucémico en adultos con diabetes tipo 2: revisión sistemática

Objective: The aim of this systematic review was to evaluate the effectiveness interventions that have used text messaging in the reduction of glycosylated hemoglobin levels in type 2 diabetes patients.Methods: a systematic review of articles published in the MEDLINE database, Elsevier, Springer, DARE, CINAHL, Scopus, and Open Access, eight interventions studies that met the inclusion criteria, were identified.Results: Intervention using short message services of cellular phones improved HbA1c levels and improved the metabolic control in T2D adults.  Conclusions: The use of text messaging in the management of T2D, is presented as a suitable, practical, and well accepted technology, it has strong potential for providing effective, ongoing support in the future. However the research studies, showed that the evidence is not yet conclusive to the improvement in glycemic control.Objetivo: Evaluar la evidencia disponible sobre la efectividad de las intervenciones que han utilizado mensajes de texto para la disminución de los niveles de hemoglobina glucosilada en el control glucémico en personas con DT2Métodos: Se realizó una revisión sistemática en las bases de datos MEDLINE, Elsevier, Springer, DARE, CINAHL, Scopus, y Open Access, se identificaron ocho artículos que cumplieron con los criterios de elegibilidad para evaluar el uso de los mensajes de texto y los niveles de HbA1c. Resultados: El envío de mensajes de texto a través de teléfono móvil mostró una disminución de los niveles de hemoglobina glucosilada en pacientes adultos con DT2 Conclusiones: La utilización de mensajes de texto en la atención de los pacientes con DT2, se presenta como una tecnología factible y bien aceptada sin embargo los estudios señalaron que la evidencia aún no es concluyente en la mejoría del control glucémico

Distribución y composición de la materia orgánica en sedimentos de la zona de oxígeno mínimo del Pacífico nororiental mexicano: implicaciones paleoceanográficas

Total organic carbon (TOC) content, total nitrogen (TN) content, elemental (C and N), and isotopic (d13C-TOC) composition of organic matter derived from both marine and terrestrial sources constrain the relative contributions from marine productivity, the mangroves, and the continental wind erosion of 36 carbonate-free surface sediments along the southwestern coast of the Baja California Peninsula. In general, the spatial patterns of TOC, TN, C:N ratio and d13C-TOC are similar. The maximum content of TOC (14.5%) and TN (1.6%) were measured inside the oxygen minimum zone (OMZ). The stable carbon isotopic compositions were enriched in 12C in surface sediments at suboxic sites within the OMZ. The C:N ratio and δ13C-TOC values indicated that the organic sediment material is predominantly of marine origin, with a minor contribution from the terrestrial source or mangroves. In the stations near to the coast, the high values of the C:N ratio and the depleted 13C values suggest a proportionally greater accumulation of terrestrial organic matter. The terrestrial-derived organic carbon content is &lt;10% at the continental margin and &gt;40% at the stations near to the coast, based on a Mixing Model of End Members.El contenido de carbono orgánico total (COT), nitrógeno total (NT), la composición elemental (C y N) e isotópica derivada de fuentes marina y terrestre ha permitido delimitar la contribución relativa de la productividad marina, los manglares y la erosión continental (eólicos) de 36 muestras de sedimentos superficiales (libres de carbono inorgánico) en el margen SW de Baja California. En general, la distribución espacial de COT, NT, la razón C:N y el d13C-COT son similares. El contenido máximo de COT (14.5%) y NT (1.6%) fue observado dentro de la zona de oxígeno mínimo. La composición isotópica de carbono está enriquecida en 12C en sedimentos superficiales de sitios subóxicos dentro de la ZOM. La razón C:N y los valores del d13C-COT indicaron que el material orgánico en sedimentos es predominantemente de origen marino con una menor contribución terrestre o de manglar. En las estaciones cercanas a la costa, los mayores valores de la razón C:N y los valores empobrecidos en 13C sugieren una acumulación mayor de materia orgánica terrestre. El contenido de carbono orgánico derivado de origen terrestre es &lt;10% en el margen continental y &gt;40% en estaciones cercanas a la costa sobre la base del modelo de mezcla de “end-members”

NIRS potential use for the determination of natural resources quality from dehesa (acorn and grass) in Montanera system for Iberian pigs.

NIRS technology has been used as an alternative to conventional methods to determinate the content of nutrients of acorns and grass from dehesa ecosystem. Dry matter (DM), crude fat (CF), crude protein (CP), starch, total phenolic compounds (TP), α-tocopherol, γ-tocopherol, fatty acids, neutral detergent fiber (NDF), total antioxidant activity (TAA) and total energy (TE) were determined by conventional methods for later development of NIRS predictive equations. The NIR spectrum of each sample was collected and for all studied parameters, a predictive model was obtained and external validated. Good prediction equations were obtained for moisture, crude fat, crude protein, total energy and γ-tocopherol in acorns samples, with high coefficients of correlation (1-VR) and low standard error of prediction (SEP) (1-VR=0.81, SEP=2.62; 1-VR=0.92, SEP=0.54; 1-VR=0.86, SEP=0.47; 1-VR=0.84, SEP=0.2; 1-VR=0.88, SEP=5.4, respectively) and crude protein, NDF, α-tocopherol and linolenic acid content in grass samples (1-VR=0.9, SEP=1.99; 1-VR=0.87, SEP=4.13; 1-VR=0.76, SEP=10.9; 1-VR=0.82, SEP=0.6, respectively). Therefore, these prediction models could be used to determinate the nutritional composition of Montanera natural resources

The black holes of topologically massive gravity

We show that an analytical continuation of the Vuorio solution to three-dimensional topologically massive gravity leads to a two-parameter family of black hole solutions, which are geodesically complete and causally regular within a certain parameter range. No observers can remain static in these spacetimes. We discuss their global structure, and evaluate their mass, angular momentum, and entropy, which satisfy a slightly modified form of the first law of thermodynamics.Comment: 10 pages; Eq. (15) corrected, references added, version to appear in Classical and Quantum Gravit

Hybrid genetic algorithm for clustering IC topographies of EEGs

Clustering of independent component (IC) topographies of Electroencephalograms (EEG) is an effective way to find brain-generated IC processes associated with a population of interest, particularly for those cases where event-related potential features are not available. This paper proposes a novel algorithm for the clustering of these IC topographies and compares its results with the most currently used clustering algorithms. In this study, 32-electrode EEG signals were recorded at a sampling rate of 500 Hz for 48 participants. EEG signals were pre-processed and IC topographies computed using the AMICA algorithm. The algorithm implements a hybrid approach where genetic algorithms are used to compute more accurate versions of the centroids and the final clusters after a pre-clustering phase based on spectral clustering. The algorithm automatically selects the optimum number of clusters by using a fitness function that involves local-density along with compactness and separation criteria. Specific internal validation metrics adapted to the use of the absolute correlation coefficient as the similarity measure are defined for the benchmarking process. Assessed results across different ICA decompositions and groups of subjects show that the proposed clustering algorithm significantly outperforms the (baseline) clustering algorithms provided by the software EEGLAB, including CORRMAP.Funding for open access charge: Universidad de Málaga / CBUA Funding for open access publishing: Universidad Málaga/CBUA. This work was supported by projects PGC2018-098,813-B C32 (Spanish “Ministerio de Ciencia, Innovación y Universidades”), UMA20-FEDERJA-086 (Consejería de economía y conocimiento, Junta de Andalucía), Project P18-rt-1624, and by European Regional Development Funds (ERDF). We also thank the Leeduca research group and Junta de Andalucía for the data supplied and the support

Light yield determination in large sodium iodide detectors applied in the search for dark matter

Application of NaI(Tl) detectors in the search for galactic dark matter particles through their elastic scattering off the target nuclei is well motivated because of the long standing DAMA/LIBRA highly significant positive result on annual modulation, still requiring confirmation. For such a goal, it is mandatory to reach very low threshold in energy (at or below the keV level), very low radioactive background (at a few counts/keV/kg/day), and high detection mass (at or above the 100 kg scale). One of the most relevant technical issues is the optimization of the crystal intrinsic scintillation light yield and the efficiency of the light collecting system for large mass crystals. In the frame of the ANAIS (Annual modulation with NaI Scintillators) dark matter search project large NaI(Tl) crystals from different providers coupled to two photomultiplier tubes (PMTs) have been tested at the Canfranc Underground Laboratory. In this paper we present the estimates of the NaI(Tl) scintillation light collected using full-absorption peaks at very low energy from external and internal sources emitting gammas/electrons, and single-photoelectron events populations selected by using very low energy pulses tails. Outstanding scintillation light collection at the level of 15~photoelectrons/keV can be reported for the final design and provider chosen for ANAIS detectors. Taking into account the Quantum Efficiency of the PMT units used, the intrinsic scintillation light yield in these NaI(Tl) crystals is above 40~photoelectrons/keV for energy depositions in the range from 3 up to 25~keV. This very high light output of ANAIS crystals allows triggering below 1~keV, which is very important in order to increase the sensitivity in the direct detection of dark matter