Search results for "Compres"

Thermomechanical Properties of Radiation-Modified Polyethylene/Ethylene-Propylene-Diene Copolymer/Liquid-Crystalline Copolyester Blends

1999

Radiation-modified blends of high-density polyethylene (PE) with ethylene-propylene-diene copolymer (EPDM; 10-65 wt.%) and thermotropic liquid-crystalline polymer (LCP; 10 wt.%) were investigated. The LCP was a liquid-crystalline copolyester of 40% poly(ethylene terephthalate) with 60% 4-hydroxybenzoic acid. The constituents were blended using a circular extruder, the specimens were prepared by compression molding and irradiated by 60Co γ-radiation up to 200 kGy. Mechanical, thermal, and morphological properties in wide temperature range were investigated for the irradiated and non-irradiated specimens. The effects of irradiation on the thermomechanical behaviour of the PE matrix are discus…

LARGE DEFORMATION CREEP BEHAVIOR OF A SOLID POLYMER.

1981

Abstract The effect of loading rate and strain on the creep behavior after sample yielding has been studied in previous communications (14–15) for Mylar in tension and for Lexan in compression. In this work the creep behavior of Lexan samples previously elongated is considered both in tension and in compression. A procedure which collects all the data independently of both loading rate and initial creep strain is proposed.

Optimized Continuous Application of Hyperpolarized Xenon to Liquids

2018

International audience; In recent years, NMR with hyperpolarized (HP) xenon inside functionalized host structures (e.g. cryptophanes) have become a potential candidate for the direct observation of metabolic processes (i.e. molecular imaging). A critical issue for real applications is the dissolution of the HP-gas in the liquid which contains the host. In this work, we present recent developments for an improved and controlled dissolution of HP-Xe in liquids using hollow fiber membranes and different compressor systems. The designed apparatus consists of a compressor and a membrane unit. The compressor provides HP-129 Xe continuously at small adjustable pressures and in a polarization-prese…

Análisis del comportamiento de las restauraciones de circona monolítica en comparación con las de metal-cerámica y las de circona-porcelana

2015

1. INTRODUCCIÓN La elección del material a emplear en Prótesis Fija debe hacerse, principalmente, en función de dos propiedades: resistencia y estética. Refiriéndonos al primero de ellos, las coronas ceramometálicas han constituido el patrón de oro. Sin embargo, su defecto es no conseguir el segundo requisito principal que le pedimos a una restauración: estética. En la continua búsqueda del material ideal, irrumpen con fuerza las circonas. 2. MATERIAL Y MÉTODO Para la realización del presente trabajo, fueron preparados 80 discos, todos ellos de 10 mm de diámetro, los cuales se dividieron en cuatro grupos, con 20 especímenes cada uno. En los dos primeros, las muestras constaban de dos capas,…

large scale structural patterne as the result of the interplay between compression and extension during chain building: the case of the Sicily belt (…

2010

Innovative Recycling of Lime Slaker Grits from Paper-Pulp Industry Reused as Aggregate in Ambient Cured Biomass Fly Ash-Based Geopolymers for Sustain…

2019

Lime slaker grits and biomass fly ash are solid wastes produced by the Kraft paper-pulp industry that are commonly disposed of in landfill. However, recent studies and European regulations discourage such disposal practices. This work investigates an alternative and innovative way to recycle and reuse these wastes in the production of green geopolymeric mortars intended for application in the construction industry. Here, biomass fly ash was used as the main source of alumino-silicate in the binder precursor (70 wt.% substitution to metakaolin), and grits (ranging from 1&ndash

The Acceptable Alternative Vehicle Fuel Price

2019

Historically, petroleum fuels have been the dominant fuel used for land transport. However, the growing need for sustainable national economics has urged us to incorporate more economical and ecological alternative vehicle fuels. The advantages and disadvantages of them complicate the decision-making process and compel us to develop adequate mathematical methods. Alternative fuel (compressed natural gas, liquefied petroleum gas, and ethanol fuel mixtures), the standard prices and their ratios were investigated. A mathematical model to determine a critical ratio between alternative and conventional fuel prices had already been developed. The results of this were investigated. The results sho…

Heating and cooling with a heat pump

2009

Tuning the Photoresponse of Nano‐Heterojunction: Pressure‐Induced Inverse Photoconductance in Functionalized WO 3 Nanocuboids

2019

S.R. and S.S. contributed equally to this work. This work was mainly supported by the Natural Science Foundation of China (Grant No. 11874076), National Science Associated Funding (NSAF, Grant No. U1530402), and Science Challenging Program (Grant No. TZ2016001). D.E. thanks the financial support from Spanish MINECO under Grant No. MAT2016-75586-C4-1-P and from Generalitat Valenciana under Grant Prometeo/2018/123, EFIMAT. The X-ray diffraction measurements were performed at the BL15U1 station, Shanghai Synchrotron Radiation Facility (SSRF) in China. The HP XAS measurements were performed at 20 ID-C, APS, ANL. APS is supported by DOE-BES, under contract no. DE-AC02-06CH11357. The authors grat…

Fisiopatología del síndrome descompresivo en tortugas marinas

2018

Hasta 2014 se consideraba que las tortugas marinas no eran susceptibles de sufrir la enfermedad descompresiva descrita en medicina humana. Pero animales capturados por redes de pesca en el mediterráneo presentaban la misma sintomatología descrita en medicina humana y respondían de forma positiva al tratamiento hiperbárico en cámara descompresiva. Hasta el presente trabajo se desconocía la fisiopatología de dicha enfermedad, pero considerábamos de gran importancia el esfínter muscular que se localiza en la arteria pulmonar de estos animales y no descrito en tortugas de agua dulce como las de la especie Trachemys sripta. El presente estudio supone una descripción anatómica, histológica y func…