953 resultados para 1-0.5 µm


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ANTECEDENTES: Las Ingestas Dietéticas de Referencia (IDR) son 4 valores que sirven de guía para la ingesta adecuada de un nutriente específico, de acuerdo con la edad, género y condición fisiológica concreta, con el fin de mantener un buen estado de salud. OBJETIVO: Determinar los valores de IDR para las vitaminas A, B y D en niños de 1 a 5 años de edad los subcentros del Ministerio de Salud Pública, del área urbana, de la ciudad de Cuenca, en el año 2015. MATERIALES Y MÉTODO: Es un estudio descriptivo transversal realizado en todos los niños que acudieron a los subcentros de salud urbanos del Ministerio de Salud Pública de Cuenca, durante el período de 6 meses. Mediante el software en línea de nutrición “Nutrimind” 2012, se aplicó el Recordatorio de 24 horas. En el programa estadístico SPSS 19, se tabularon los datos, se calculó el promedio de la ingesta de las vitaminas A, B y D por grupo etario y por sexo. Se compararon estos resultados con las IDR internacionales. RESULTADOS: De los 580 niños estudiados el 64.7% fueron lactantes y el 35.3% escolares, el 49.8% fueron de sexo masculino y el 50.2% femenino. El promedio de ingesta de las vitaminas A, B1, B2 y B3 sobrepasa las ingestas recomendadas. Para las vitaminas B6, B9 y D está por debajo de las recomendaciones. El promedio de ingesta para la vitamina B12 cubre las necesidades diarias recomendadas

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Se realiza un estudio clínico cuasi experimental en 80 embarazadas entre 20 y 29 años de edad sometidas a intervención cesárea en el Hospital Vicente Corral Moscoso, en 1997. Previo a su consentimiento recibieron 0.2 mg/kg. peso de una solución de bupivacaína al 0.5 por ciento isobárica e hiperbárica. El propósito de este estudio fue comparar los cambios cardiovasculares, el nivel de analgesia, la duración de la cirugía, la duración de la anestesia y las complicaciones después de adminstrar una u otra solución. Las pacientes fueron divididas en 2 grupos: El grupo 1 que recibió bupivacaína isobárica y el grupo 2 al que se le administró bupivacaína hiperbárica [8-25 por ciento glucosa]. El nivel más alto de bloqueo sensorial fue encontrado a nive de T7 en el grupo 1 y T4 en en grupo 2, siendo la diferencia estadísticamente significatica [p<0.01]. Un bloqueo motor completo se obtuvo en todos los pacientes. La caída de la presión arterial fue más frecuente con la solución hiperbárica, siendo la diferencia estadísticamte significativa. No se encontró diferencias significativas en lo referente a la bradicardia, comparando los 2 grupos. La duración de la anestesia con solución isobárica fue mayor [p<0.05]. La mayor parte de los cambios cariovasculares en el bloqueo espinal con bupivacaína isobárica sucedieron dentro de los 20-30 minutos. Otras complicaciones fueron la nausea, el vómito y la cefalea postpunción en los 2 grupos, siendo menores en el grupo 1. En ambos grupos no hubo modificaciones en el grupo de vitalidad fetal

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This tutorial is designed to help new users become familiar with using the Spartan-3E board. The tutorial steps through the following: writing a small program in VHDL which carries out simple combinational logic; connecting the program inputs and outputs to the switches, buttons and LEDs on the Spartan-3E board; and downloading the program to the Spartan-3E board using the Project Navigator software.

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Analyzing security protocols is an ongoing research in the last years. Different types of tools are developed to make the analysis process more precise, fast and easy. These tools consider security protocols as black boxes that can not easily be composed. It is difficult or impossible to do a low-level analysis or combine different tools with each other using these tools. This research uses Coloured Petri Nets (CPN) to analyze OSAP trusted computing protocol. The OSAP protocol is modeled in different levels and it is analyzed using state space method. The produced model can be combined with other trusted computing protocols in future works.

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The Balanced method was introduced as a class of quasi-implicit methods, based upon the Euler-Maruyama scheme, for solving stiff stochastic differential equations. We extend the Balanced method to introduce a class of stable strong order 1. 0 numerical schemes for solving stochastic ordinary differential equations. We derive convergence results for this class of numerical schemes. We illustrate the asymptotic stability of this class of schemes is illustrated and is compared with contemporary schemes of strong order 1. 0. We present some evidence on parametric selection with respect to minimising the error convergence terms. Furthermore we provide a convergence result for general Balanced style schemes of higher orders.

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This tutorial is designed to help new users become familiar with using the PicoBlaze microcontroller with the Spartan-3E board. The tutorial gives a brief introduction to the PicoBlaze microcontroller, and then steps through the following: - Writing a small PicoBlaze assembly language (.psm) file, and stepping through the process of assembling the .psm file using KCPSM3; - Writing a top level VHDL module to connect the PicoBlaze microcontroller (KCPSM3 component) and the program ROM, and to connect the required input and output ports; - Connecting the top level module inputs and outputs to the switches, buttons and LEDs on the Spartan-3E board; - Downloading the program to the Spartan-3E board using the Project Navigator software.

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This tutorial is designed to assist users who wish to use the LCD screen on the Spartan-3E board. In this tutorial, the PicoBlaze microcontroller is used to control the LCD. The tutorial is organised into three Parts. In Part A, code is written to display the message "Hello World" on the LCD. Part B demonstrates how to define and display custom characters. Finally, Part C shows how the display can be shifted and flashed. Shifting is done by using a delay in the main PicoBlaze program loop, while flashing is done using the PicoBlaze interrupt. The slider switches can be used to select the shifting direction, and to turn shifting and flashing on and off.

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This report describes the available functionality and use of the ClusterEval evaluation software. It implements novel and standard measures for the evaluation of cluster quality. This software has been used at the INEX XML Mining track and in the MediaEval Social Event Detection task.

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The structure of several carboxy-substituted hexahydro-1,4:5,8-diepoxynaphthalenes have been solved with X-ray crystallography, in some cases confirming previously contentious structures. The compounds of interest are constructed in efficient one-step 2 × [4+2] cycloaddition reactions from furan and acetylene carboxylate derivatives.

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1,4-Diazabicyclo[2.2.2]octane (DABCO) forms well-defined co-crystals with 1,2-diiodotetrafluorobenzene (1,2-DITFB), [(1,2-DITFB)2DABCO], and 1,3,5-triiodotrifluorobenzene, [(1,3,5-TITFB)2DABCO]. Both systems exhibited lower-than-expected supramolecular connectivity, which inspired a search for polymorphs in alternative crystallization solvents. In dichloromethane solution, the Menshutkin reaction was found to occur, generating chloride anions and quaternary ammonium cations through the reaction between the solvent and DABCO. The controlled in situ production of chloride ions facilitated the crystallization of new halogen bonded networks, DABCO–CH2Cl[(1,2-DITFB)Cl] (zigzag X-bonded chains) and (DABCO–CH2Cl)3[(1,3,5-TITFB)2Cl3]·CHCl3 (2D pseudo-trigonal X-bonded nets displaying Borremean entanglement), propagating with charge-assisted C–I···Cl– halogen bonds. The method was found to be versatile, and substitution of DABCO with triethylamine (TEA) gave (TEA-CH2Cl)3[(1,2-DITFB)Cl3]·4(H2O) (mixed halogen bond hydrogen bond network with 2D supramolecular connectivity) and TEA-CH2Cl[(1,3,5-TITFB)Cl] (tightly packed planar trigonal nets). The co-crystals were typically produced in high yield and purity with relatively predictable supramolecular topology, particularly with respect to the connectivity of the iodobenzene molecules. The potential to use this synthetic methodology for crystal engineering of halogen bonded architectures is demonstrated and discussed.

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The behavior of small molecules on a surface depends critically on both molecule–substrate and intermolecular interactions. We present here a detailed comparative investigation of 1,3,5-benzene tricarboxylic acid (trimesic acid, TMA) on two different surfaces: highly oriented pyrolytic graphite (HOPG) and single-layer graphene (SLG) grown on a polycrystalline Cu foil. On the basis of high-resolution scanning tunnelling microscopy (STM) images, we show that the epitaxy matrix for the hexagonal TMA chicken wire phase is identical on these two surfaces, and, using density functional theory (DFT) with a non-local van der Waals correlation contribution, we identify the most energetically favorable adsorption geometries. Simulated STM images based on these calculations suggest that the TMA lattice can stably adsorb on sites other than those identified to maximize binding interactions with the substrate. This is consistent with our net energy calculations that suggest that intermolecular interactions (TMA–TMA dimer bonding) are dominant over TMA–substrate interactions in stabilizing the system. STM images demonstrate the robustness of the TMA films on SLG, where the molecular network extends across the variable topography of the SLG substrates and remains intact after rinsing and drying the films. These results help to elucidate molecular behavior on SLG and suggest significant similarities between adsorption on HOPG and SLG.

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The molecular conformation of the title compound, C20H17N3, is stabilized by an intramolecular C-H center dot center dot center dot N interaction. The crystal structure shows intermolecular C-H center dot center dot center dot pi interactions. The dihedral angle between the isoquinoline unit and the phenyl ring is 11.42 (1)degrees whereas the isoquinoline unit and the pendent dimethyl pryrazole unit form a dihedral angle of 50.1 (4)degrees. Furthermore, the angle between the mean plane of the phenyl ring and the dimethyl pyrazole unit is 47.3 (6)degrees.