124 research outputs found

    Dise√Īo de 1600 ML de adoquinado, ubicado en los barrios: anexo a la villa Victoria de julio, Antonio Mendoza y Rub√©n Ulloa; en el casco urbano de Tipitapa, municipio de Managua

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    El desarrollo de nuestro pa√≠s se basa en elementos fundamentales, como: agricultura industria, ganader√≠a, comercio, turismo, etc. Pero el factor determinante entre estos es el sistema nacional de transporte es decir: transporte terrestre, transporte a√©reo, transporte mar√≠timo, etc. el cual es el enlace principal para el desarrollo de la sociedad. En Nicaragua el transporte terrestre es el m√°s utilizado por la poblaci√≥n, y debido al aumento de la movilizaci√≥n de veh√≠culos con motores m√°s potentes por las v√≠as, obliga a la modernizaci√≥n de la infraestructura vial, permitiendo un tr√°nsito m√°s seguro y eficiente. El incremento de la red vial est√° vinculado directamente con la econom√≠a de nuestro pa√≠s, pues su papel es primordial en las actividades que se realizan a diario en los diferentes sectores que aportan a la econom√≠a nacional. Actualmente la construcci√≥n de nuevas v√≠as de comunicaci√≥n, rehabilitaci√≥n de carreteras y mejoras de los caminos ya existentes debe ser una necesidad para los gobiernos, ya que constituyen un componente fundamental para el bienestar y desarrollo de la sociedad, adem√°s su dise√Īo debe adoptar las condiciones necesarias para obtener una obra de calidad; cumpli√©ndose en el todos los principios y normas correspondientes al dise√Īo de carreteras. El presente trabajo denominado ‚Äė‚ÄėDise√Īo de 1600 ML de calle, ubicados en los barrios: Anexo la Villa Rub√©n Ulloa, Villa Victoria de Julio y Antonio Mendoza localizados en el casco urbano de Tipitapa, municipio de Managua‚Äô‚Äô. Muestra en su contenido los estudios, m√©todos y normas aplicables para elaborar: el dise√Īo geom√©trico de la v√≠a, dise√Īo hidr√°ulico y de la estructura de pavimento, tomando en cuenta las especificaciones correspondientes al dise√Īo de carreteras en Nicaragua

    Additional file 1 of Transcriptome analysis of the transition from primary to secondary growth of vertical stem in Eucalyptus grandis

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    Additional file 1: Supplemental Table 1. The expression of DEGs (TPM) in different internodes. Supplemental Table 2. The result-cluster data of Mfuzz analysis. Supplemental Table 3. The primers of selected genes used for qRT-PCR. Supplemental Table 4. Gene names and accession numbers in lignin biosynthesis. Supplemental Table 5. The result data of WGCNA analysis. Supplemental Table 6. 70 selected genes with annotation. Supplemental Table 7. Gene names and accession numbers in the network map. Supplemental Table 8. Gene names and accession numbers in cellulose and xylan biosynthesis

    Rapid and Efficient Multiple Healing of Flexible Conductive Films by Near-Infrared Light Irradiation

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    Healable, electrically conductive films are essential for the fabrication of reliable electronic devices to reduce their replacement and maintenance costs. Here we report the fabrication of near-infrared (NIR) light-enabled healable, highly electrically conductive films by depositing silver nanowires (AgNWs) on polycaprolactone (PCL)/poly¬≠(vinyl alcohol) (PVA) composite films. The bilayer film has sheet resistance as low as 0.25 ő©¬∑sq<sup>‚Äď1</sup> and shows good flexibility to repeated bending/unbending treatments. Multiple healing of electrical conductivity lose caused by cuts of several tens of micrometers wide on the bilayer film can be conveniently achieved by irradiating the film with mild NIR light. The AgNW layer functions not only as an electrical conductor but also as a NIR light-induced heater to initiate the healing of PCL/PVA film, which then imparts its healability to the conductive AgNW layer

    Additional file 2: of Genome sequence of a dissimilatory Fe(III)-reducing bacterium Geobacter soli type strain GSS01T

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    Amino acid sequence alignment of pilin domain protein SE37_07695 from Geobacter soli GSS01 and those from other bacteria. Amino acid sequence alignments were generated using the Clustal X (1.8). (PDF 40 kb

    Intumescent Flame-Retardant and Self-Healing Superhydrophobic Coatings on Cotton Fabric

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    Flame-retardant and self-healing superhydrophobic coatings are fabricated on cotton fabric by a convenient solution-dipping method, which involves the sequential deposition of a trilayer of branched poly(ethylenimine) (bPEI), ammonium polyphosphate (APP), and fluorinated-decyl polyhedral oligomeric silsesquioxane (F-POSS). When directly exposed to flame, such a trilayer coating generates a porous char layer because of its intumescent effect, successfully giving the coated fabric a self-extinguishing property. Furthermore, the F-POSS embedded in cotton fabric and APP/bPEI coating produces a superhydrophobic surface with a self-healing function. The coating can repetitively and autonomically restore the superhydrophobicity when the superhydrophobicity is damaged. The resulting cotton fabric, which is flame-resistant, waterproof, and self-cleaning, can be easily cleaned by simple water rinsing. Thus, the integration of self-healing superhydrophobicity with flame retardancy provides a practical way to resolve the problem of washing durability of the flame-retardant coatings. The flame-retardant and superhydrophobic fabric can endure more than 1000 cycles of abrasion under a pressure of 44.8 kPa without losing its flame retardancy and self-healing superhydrophobicity, showing potential applications as multifunctional advanced textiles

    Highly Transparent, Nanofiller-Reinforced Scratch-Resistant Polymeric Composite Films Capable of Healing Scratches

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    Integration of healability and mechanical robustness is challenging in the fabrication of highly transparent films for applications as protectors in optical and displaying devices. Here we report the fabrication of healable, highly transparent and scratch-resistant polymeric composite films that can conveniently and repeatedly heal severe damage such as cuts of several tens of micrometers wide and deep. The film fabrication process involves layer-by-layer (LbL) assembly of a poly(acrylic acid) (PAA) blend and branched poly(ethylenimine) (bPEI) blend, where each blend contains the same polyelectrolytes of low and high molecular weights, followed by annealing the resulting PAA/bPEI films with aqueous salt solution and incorporation of CaCO<sub>3</sub> nanoparticles as nanofillers. The rearrangement of low-molecular-weight PAA and bPEI under aqueous salt annealing plays a critical role in eliminating film defects to produce optically highly transparent polyelectrolyte films. The in situ formation of tiny and well-dispersed CaCO<sub>3</sub> nanoparticles gives the resulting composite films enhanced scratch-resistance and also retains the healing ability of the PAA/bPEI matrix films. The reversibility of noncovalent interactions among the PAA, bPEI, and CaCO<sub>3</sub> nanoparticles and the facilitated migration of PAA and bPEI triggered by water enable healing of the structural damage and restoration of optical transparency of the PAA/bPEI films reinforced with CaCO<sub>3</sub> nanoparticles

    S1 Data -

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    The characteristics of sampling rural households.

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    The characteristics of sampling rural households.</p

    Livelihood strategies of different types of rural households in response to the epidemic in various periods (%).

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    Livelihood strategies of different types of rural households in response to the epidemic in various periods (%).</p
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