El mango mangífera índica : manejo postcosecha

Manual de manejo de postcosecha del mango en el que se describen generalidades asociadas al cultivo, de mango, su origen, clasificación, variedades, manejo durante la cosecha y postcosecha, mercadeo y comercialización.Mango postharvest handling manual describing generalities associated with the cultivation, mango, its origin, classification, varieties, handling during harvest and postharvest, marketing and marketing.Generalidades -- Manejo de la cosecha -- Manejo de la postcosecha -- Fisiología de postcosecha de los frutos del mangonaDocumento producto del convenio entre el SENA y la Universidad Nacional de Colombia, programa de investigación "Manejo de postcosecha de frutas y hortalizas”70 página

Scanning Tunneling Microscopy in the superconductor LaSb2

We present very low temperature (0.15 K) scanning tunneling microscopy and spectroscopy experiments in the layered superconductor LaSb$_2$. We obtain topographic microscopy images with surfaces showing hexagonal and square atomic size patterns, and observe in the tunneling conductance a superconducting gap. We find well defined quasiparticle peaks located at a bias voltage comparable to the weak coupling s-wave BCS expected gap value (0.17 meV). The amount of states at the Fermi level is however large and the curves are significantly broadened. We find T$_c$ of 1.2 K by following the tunneling conductance with temperature.Comment: 5 pages, 4 figure

Magnetic field dependence of the density of states in the multiband superconductor β\beta-Bi2_2Pd

We present very low temperature scanning tunneling microscopy (STM) experiments on single crystalline samples of the superconductor $\beta$-Bi$_2$Pd. We find a single fully isotropic superconducting gap. However, the magnetic field dependence of the intervortex density of states is higher than the one expected in a single gap superconductor, and the hexagonal vortex lattice is locked to the square atomic lattice. Such increase in the intervortex density of states and vortex lattice locking have been found in superconductors with multiple superconducting gaps and anisotropic Fermi surfaces. We compare the upper critical field $H_{c2}(T)$ obtained in our sample with previous measurements and explain available data within multiband supercondutivity. We propose that $\beta$-Bi$_2$Pd is a single gap multiband superconductor. We anticipate that single gap multiband superconductivity can occur in other compounds with complex Fermi surfaces.Comment: 8 pages, 7 figure

Magnetic and superconducting phase diagrams in ErNi2B2C

We present measurements of the superconducting upper critical field Hc2(T) and the magnetic phase diagram of the superconductor ErNi2B2C made with a scanning tunneling microscope (STM). The magnetic field was applied in the basal plane of the tetragonal crystal structure. We have found large gapless regions in the superconducting phase diagram of ErNi2B2C, extending between different magnetic transitions. A close correlation between magnetic transitions and Hc2(T) is found, showing that superconductivity is strongly linked to magnetism.Comment: 5 pages, 4 figure

Scanning tunneling spectroscopy of layers of superconducting 2H-TaSe2_\textbf{2}: Evidence for a zero bias anomaly in single layers

We report a characterization of surfaces of the dichalcogenide TaSe$_2$ using scanning tunneling microscopy and spectroscopy (STM/S) at 150 mK. When the top layer has the 2H structure and the layer immediately below the 1T structure, we find a singular spatial dependence of the tunneling conductance below 1 K, changing from a zero bias peak on top of Se atoms to a gap in between Se atoms. The zero bias peak is additionally modulated by the commensurate $3a_0 \times 3a_0$ charge density wave of 2H-TaSe$_2$. Multilayers of 2H-TaSe$_2$ show a spatially homogeneous superconducting gap with a critical temperature also of 1 K. We discuss possible origins for the peculiar tunneling conductance in single layers.Comment: 10 pages, 10 figure

Las competencias ciudadanas como estrategia pedag?gica para mejorar la convivencia escolar y el clima laboral del CDI creando sue?os

76 p. Recurso Electr?nicoLa presente investigaci?n expone la importancia de la resoluci?n de conflictos para generar un clima laboral arm?nico que fortalezca las relaciones interpersonales y el desempe?o laboral del talento humano del centro de desarrollo infantil creando sue?os. En la investigaci?n el tipo de estudio es mixto, con una metodolog?a de investigaci?n acci?n participativa debido a que este da la posibilidad de analizar una problem?tica dentro de un contexto y permite que los investigadores intervengan en el mismo. La unidad de trabajo la conformaron 30 miembros del talento humano, los instrumentos utilizados fueron la observaci?n participante, el diario de campo, una entrevista y una encuesta. Como conclusiones del estudio se obtuvo que el personal del talento humano usa una comunicaci?n no asertiva que poco favorece el buen funcionamiento de las relaciones interpersonales, sum?ndose que el operador no se interesa por el bienestar laboral de sus empleados, por lo que se plante? en el trabajo de investigaci?n algunas sugerencias y recomendaciones tanto al operador como al talento humano que all? laboran con el prop?sito de ayudar a solventar las situaciones encontradas. Palabras claves: Resoluci?n de conflictos, clima laboral, bienestar laboral, relaciones interpersonales.The present research exposes the importance of conflict resolution to generate a harmonious work environment that strengthens the interpersonal relationships and the labor performance of the human talent of the child development center creating dreams. In the research the type of study is mixed, with a participatory action research methodology because it gives the possibility to analyze a problem within a context and allows researchers to intervene in it. The unit of work was made up of 30 members of the human talent, the instruments used were participant observation, the field diary, an interview and a survey. As conclusions of the study it was obtained that the personnel of the human talent uses a nonassertive communication that little favors the good functioning of the interpersonal relations, adding that the operator is not interested in the well-being of its employees, reason why it was raised in the Research work some suggestions and recommendations to both the operator and the human talent who work there with the purpose of helping to solve the situations encountered. Key words: Conflict resolution, work climate, wellbeing, interpersonal relationships

Scale-invariant magnetoresistance in a cuprate superconductor

The anomalous metallic state in high-temperature superconducting cuprates is masked by the onset of superconductivity near a quantum critical point. Use of high magnetic fields to suppress superconductivity has enabled a detailed study of the ground state in these systems. Yet, the direct effect of strong magnetic fields on the metallic behavior at low temperatures is poorly understood, especially near critical doping, $x=0.19$. Here we report a high-field magnetoresistance study of thin films of \LSCO cuprates in close vicinity to critical doping, $0.161\leq x\leq0.190$. We find that the metallic state exposed by suppressing superconductivity is characterized by a magnetoresistance that is linear in magnetic field up to the highest measured fields of $80$T. The slope of the linear-in-field resistivity is temperature-independent at very high fields. It mirrors the magnitude and doping evolution of the linear-in-temperature resistivity that has been ascribed to Planckian dissipation near a quantum critical point. This establishes true scale-invariant conductivity as the signature of the strange metal state in the high-temperature superconducting cuprates.Comment: 10 pages, 3 figure

Inverse Problems in a Bayesian Setting

In a Bayesian setting, inverse problems and uncertainty quantification (UQ) --- the propagation of uncertainty through a computational (forward) model --- are strongly connected. In the form of conditional expectation the Bayesian update becomes computationally attractive. We give a detailed account of this approach via conditional approximation, various approximations, and the construction of filters. Together with a functional or spectral approach for the forward UQ there is no need for time-consuming and slowly convergent Monte Carlo sampling. The developed sampling-free non-linear Bayesian update in form of a filter is derived from the variational problem associated with conditional expectation. This formulation in general calls for further discretisation to make the computation possible, and we choose a polynomial approximation. After giving details on the actual computation in the framework of functional or spectral approximations, we demonstrate the workings of the algorithm on a number of examples of increasing complexity. At last, we compare the linear and nonlinear Bayesian update in form of a filter on some examples.Comment: arXiv admin note: substantial text overlap with arXiv:1312.504