Search results for " dona"

Relación de los libros del Sr. Pavordre D. José Mascarós

Ms Lletra de fins s. XVIII Tít. en portadella: Relacion de los libros del Sr. Pavordre D. José Mascarós

Induced Modification of Flexural Toughness of Natural Hydraulic Lime Based Mortars by Addition of Giant Reed Fibers

2020

Abstract Nowadays, there is a growing need to reduce the environmental impact generated by the use of inorganic materials for building applications. The aim of this work is to investigate the bio-lime based mortar flexural toughness improvement due to the addition of common reed fibers (Arundo donax L.) in order to evaluate their possible application as ductile eco-compatible prefabricated bricks or laying and joint mortars for masonry. Different sets of specimens were tested by varying the fiber weight content and the fiber length. Moreover, chemical treatments with Linseed Oil and Polyethylene glycol (PEG) were performed to improve the physical and mechanical properties of the fibers as w…

Autohydrolysis pretreatment of Arundo donax: a comparison between microwave-assisted batch and fast heating rate flow-through reaction systems

2015

Background: Autohydrolysis of lignocellulosic biomass in liquid hot water has been widely studied owing to its high efficiency and relatively low cost. In the perspective of industrial applications, continuous or semi-continuous processes are more interesting than batch systems. Moreover, microwave heating of pretreatment systems has been proposed to intensify the kinetics of the process. In this study, the autohydrolysis of Arundo donax was performed in pure liquid hot water using a microwave-heated batch reactor and a semi-continuous flow-through reaction system with fast heating rate at the same operating conditions with the aim of performing a systematic comparison between the two diffe…

PLA based biocomposites reinforced with Arundo donax fillers

2014

Abstract In this work, for the first time, a natural and almost inexpensive filler obtained by grinding the culms of Arundo donax was used to prepare PLA based biocomposites. The composites were prepared by melt compounding PLA with A. donax filler (ADF). The influence of the content and size of ADF on the morphology and on the mechanical and thermal properties of PLA–ADF composites was evaluated. Moreover, ADF was extracted from composites to evaluate the effect of processing on morphology and dimensions of the incorporated filler. Furthermore, the experimental elastic moduli of the biocomposites have been fitted, employing two theoretical models, i.e., Hill and Halpin–Tsai. The results sh…

Static and dynamic mechanical properties of Arundo Donax fillers-epoxy composites

2014

Abstract Aim of this work is to investigate the feasibility of using a natural and inexpensive filler obtained by grinding the culms of Arundo Donax as reinforcement of epoxy resins. The effect of the content and size of Arundo Donax fillers on static and dynamic mechanical properties was evaluated showing that the composites exhibit higher tensile moduli, comparable flexural moduli and lower strength properties in comparison to the neat resin. Moreover, changes in the storage and the loss moduli only above the glass transition temperature (i.e. in the rubbery region) were found while neither significant shifts of tan δ peaks to higher temperatures nor reductions in the peak height of the c…

Ārvalstu uzņēmuma darbības stratēģija Latvijas tirgū

2015

Bakalaura darba tēma – „Ārvalstu uzņēmuma darbības stratēģija Latvijas tirgū”. Joprojām ir vērojama jaunu ātrās ēdināšanas tirgus dalībnieku ienākšana Latvijā, kas tikai daļēji ietekmē jau esošo ēstuvju darbības rādītājus. Šādā situācijā uzņēmuma darbības stratēģijas izvēlei ir īpaša loma, jo iespējams attīstīties augoša tirgū un gūt vērā ņemamus ienākumus un peļņu. Bakalaura darba mērķis ir noteikt MCDonald’s zīmola uzņēmuma attīstības un tālākas ieejas iespējas Latvijas tirgū. Mērķa sasniegšanai autors izvirza sekojošus uzdevumus: 1.pētīt tirgus ieiešanas stratēģiju būtību; 2.pētīt McDonalds attīstības stratēģiskos nosacījumus un problēmas ārzemēs; 3.analizēt SIA „Premier Restaurants Latv…

INDUCED MODIFICATION OF FLEXURAL TOUGHNESS OF BIO-LIME BASED MORTARS BY ADDITION OF GIANT REED FIBERS

2019

Fibers are often used as reinforcement of brittle materials, like mortars, in order to modify their mechanical behavior; particularly the modification in post-cracking toughness, induced by low elasticity modulus fibers in the artificial stone material, is the main goal in natural fibers mortar manufacturing. In this work Arundo donax L. fibers are used to reinforce lime mortars according to the characteristics of this plant, very commonly available and with high mechanical properties, similar to bamboo, traditionally used in buildings in Spain. Influence of fibers’ length and weight ratio is studied. Particularly, three different fibers’ lengths, 4, 8 and 12 centimeters, and three weight r…

Effect of various moisture content on the mechanical and viscoelastic properties of giant reed Arundo donax L.

2015

The giant reed Arundo donax L. is an aggressive grass widely diffused throughout warm temperate regions. Thanks to its remarkable features as fast-growing, eco friendly and high specific properties (i.e. high strength/weight and modulus/weight ratios), it is widely used in ancient and traditional buildings, especially in the realization of supports for roof cladding and paneling of walls. A better understanding and a consequent standardization of its properties could make it more suitable for general application in the sustainable building industry. Mechanical and viscoelastic properties of the giant reed were studied as a function of the moisture content. To this scope, various sets of ree…

Nota de los libros legados á la Universidad literaria de Valencia por Dn. Ignacio Navarro

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Relacion de los libros legados á la Universidad literaria de Valencia por D. Ignacio Navarro

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