Search results for "NaCl"

Comparative study of degassing membrane modules for the removal of methane from Expanded Granular Sludge Bed anaerobic reactor effluent

2016

Abstract The feasibility of an emergent technology for in situ removal/recovery of methane from the effluent of an Expanded Granular Sludge Bed (EGSB) anaerobic reactor has been studied. For this purpose, the performances of two commercial hollow fibre degassing contactors with different membrane materials – microporous (polypropylene, PP) and non-porous (polydimethylsiloxane, PDMS) – were compared. The influence of water fluxes (Q L /A membrane ranging from 22.6 to 377.4 L h −1  m −2 ), vacuum pressure (140–800 mbar), sweep gas fluxes (Q N2 /A membrane ranging from 0.14 × 10 3 to 4.44 × 10 3  L h −1  m −2 ), and mode of operation (liquid flowing in the lumen side or the shell side) was stu…

Melting curve and phase diagram of vanadium under high-pressure and high-temperature conditions

2019

Melting curve and phase diagram of vanadium under high-pressure and high-temperature conditions We report a combined experimental and theoretical study of the melting curve and the structural behavior of vanadium under extreme pressure and temperature. We performed powder x-ray-diffraction experiments up to 120 GPa and 4000 K, determining the phase boundary of the body-centered cubic-to-rhombohedral transition and melting temperatures at different pressures. Melting temperatures have also been established from the observation of temperature plateaus during laser heating, and the results from the density-functional theory calculations. Results obtained from our experiments and calculations a…

Caratteristiche di Personalità e Profili Anaclitici/Introiettivi di Adolescenti Borderline

2014

Il Disturbo Borderline di Personalità (DBP) in adolescenza occupa un ruolo centrale (Bradley, Conklin, & Westen, 2005), nonostante l’eterogeneità, la comorbidità e la difficile diagnosticabilità (Heitz et al., 2014). Diversi sono stati i tentativi di creare categorie discrete in grado di identificare profili di funzionamento della personalità sufficientemente omogenei (cfr. Wixom, Ludolph, & Westen, 1993; Blatt & Luyten, 2009). Nel nostro studio ci proponiamo di confermare l’esistenza di profili introiettivi/anaclitici all’interno dello spettro borderline. Sono stati somministrati a due gruppi di soggetti (clinico vs controllo) la Structured Clinical Interview for DSM-IV Axis II Disorders (…

Structure of matrices based on pectin : formulation, characterization, functionality and controlled release during the encapsulation

2016

In this thesis, we studied the interactions between an anionic polysaccharide (pectin) and monovalent cation (Na+) and divalent cations (Ca2+, Zn2+, Ba2+, Mg2+) in dilute regime (c Ca2+ > Zn2+ > Mg2+; this may be related to the affinity between the water molecules from the coordination sphere and the cation. Indeed, the affinity of the cation for water molecules increases in the reverse order: Ba2+ < Ca2+ < Zn2+ < Mg2+. Finally, we have used the three polysaccharides (PGA, LMP and ALMP - amidated low methoxyl pectin) in association with calcium ions to produce microparticles containing rutin to target drug release in the intestine. We have linked the rutin release kinetics to the network st…

Study of the high temperature behaviour of titanium alloy Ti6242S under complex atmospheres : aeronautical applications

2018

The use of titanium alloys in many applications (transport, energy, chemistry,...) allows significant weight savings in relation to the good mechanical properties/density ratio of these materials. Since titanium alloys are employed at high temperatures (T>500°C), their behavior in such conditions has to be studied in severe conditions in order to understand degradation mechanisms. Moreover, some specific conditions can be met during application, like thermal cycling, water vapour or presence of salts. These parameters are known to influence oxidation behavior of titanium alloys.In this thesis work, oxidation behavior of an aeronautics titanium alloy (Ti6242S) has been studied in air and moi…

Reverse electrodialysis heat engine with multi-effect distillation: Exergy analysis and perspectives

2019

Abstract The increasing worldwide energy demand is rising the interest on alternative power production technologies based on renewable and emission-free energy sources. In this regard, the closed-loop reverse electrodialysis heat engine is a promising technology with the potential to convert low-grade heat into electric power. The reverse electrodialysis technology has been under investigation in the last years to explore the real potentials for energy generation from natural and artificial solutions, and recent works have been addressing also the potential of its coupling with regeneration strategies, looking at medium and large energy supply purposes. In this work, for the first time, a c…

Demethanization of aqueous anaerobic effluents using a polydimethylsiloxane membrane module: Mass transfer, fouling and feasibility

2017

Abstract The performance, fouling and feasibility of a polydimethylsiloxane hollow fibre membrane module for in situ methane degasification from the effluent of an Expanded Granular Sludge Bed anaerobic reactor has been investigated. Experiments at different operational conditions were carried out (liquid flow, sweep gas flow and vacuum pressure) with maximum removal efficiency (77%) at lowest flow-rate (0.4 L h−1), highest vacuum gauge pressure (−800 mbar) and liquid flowing in lumen side. Mass transport analysis denoted a considerably higher methane transfer than that predicted (attributed to liquid oversaturation). An enhancement factor for liquid phase has been proposed to correlate the…

Effects of hyperosmolar stimulation on IL-8 release in different bronchial epithelial cell lines

2009

Simulación de un proceso industrial de cristalización de Cloruro de Sodio (NaCl) y aplicaciones

2014

RESUMEN: La cristalización a partir de disoluciones es importante industrialmente dada la gran variedad de sustancias que se comercializan cristalizadas. Para mejorar la enseñanza aprendizaje de esta Operación Básica, en este trabajo, realizado como Trabajo Fin de Carrera de Ingeniería Química, se ha implementado un programa de simulación de una cristalización, partiendo de los datos de una cristalización industrial de NaCl. El objetivo ha sido manejar herramientas de cálculo para simular y optimizar esta operación, lo que permite conocer más profundamente el proceso de la cristalización y la utilización de las herramientas de cálculo, es decir, utilizar simultáneamente los conocimientos ad…

Associative behaviour of κ-carrageenan in aqueous solutions and its modification by different monovalent salts as reflected by viscometric parameters

2019

Abstract The viscometric behaviour of κ-carrageenan in aqueous solutions and in the presence of monovalent salts was investigated at 25 °C. Coil, helix or double helix conformations were induced by cooling hot κ-carrageenan solutions under appropriate ionic conditions. A new viscometric approach was used for modeling the behaviour of κ-carrageenan solutions. The intrinsic viscosity, [η], is markedly changed by the presence of different monovalent salts (NaCl, NaI and CsI). In pure water, the intrinsic viscosity amounts to 48 dL·g−1. In 0.1 M NaCl solutions (single helix state) [η] is 6.2 dL·g−1, whereas in 0.1 M NaI (double helix conformation) it is approximately twice as large. In 0.1 M Cs…