Search results for "SEP"

Some insights on the description of gradient elution in reversed-phase liquid chromatography

2014

The so-called "fundamental equation for gradient elution" has been used for modeling the retention in gradient elution. In this approach, the instantaneous retention factor (k) is expressed as a function of the change in the modifier content (φ(ts )), ts being the time the solute has spent in the stationary phase. This approach can only be applied at constant flow rate and with gradients where the elution strength depends on the column length following a f(t-l/u) function, u being the linear mobile phase flow rate, and l the distance from the column inlet to the location where the solute is at time t measured from the beginning of the gradient. These limitations can be solved by using the h…

Effect of different aqueous solutions of pure salts and salt mixtures in reverse electrodialysis systems for closed-loop applications

2018

Abstract Reverse Electrodialysis (RED) in a closed-loop arrangement is a viable way to convert low-grade heat into electric power. The present work experimentally investigates the use of pure salt- and equimolar two salts-water solutions as feeds in a lab-scale RED unit. RED performances were analysed in terms of Open Circuit Voltage (OCV), stack resistance and corrected power density. The pure salts and the mixtures employed were chosen via a computational analysis. Effect of feed solution velocity and concentration was investigated. Results concerning the pure salt-water experiments show that NH4Cl is the most performing salt in the concentration range probed, while higher power density v…

Cultivable Fungal Endophytes in Roots, Rhizomes and Leaves of Posidonia oceanica (L.) Delile along the Coast of Sicily, Italy

2022

The presence of endophytic fungi in the roots, rhizomes, and leaves of Posidonia oceanica was evaluated in different localities of the Sicilian coast. Samples of roots, rhizomes, and leaves were submitted to isolation techniques, and the obtained fungal colonies were identified by morphological and molecular (rRNA sequencing) analysis. Fungal endophytes occurred mainly in roots and occasionally in rhizomes and leaves. Lulwoana sp. was the most frequent of the isolated taxa, suggesting a strong interaction with the host. In addition, eight other fungal taxa were isolated. In particular, fungi of the genus Ochroconis and family Xylariaceae were identified as endophytes in healthy plants at al…

Operatiivinen vainoharha normaalitieteen aikakaudella : Jaakko Yli-Juonikkaan Neuromaanin kokeellinen poetiikka

2021

Auge y declive del teatro lírico en Valencia

2016

Durante los años 1900 - 1910 la ópera fue una manifestación artística muy popular en la sociedad valenciana. El elevado número de funciones y de coliseos de la capital del Turia que representaban óperas en sus proscenios así lo atestiguan. Empero, no obstan te, a partir del segundo decenio del siglo XX asistimos a un franco declive de este género, especialmente después de la I Guerra Mundial y la irrupción del cinematógrafo. El cierre del Teatro Real de Madrid y la depresión económica de 1929 serán los dos úl timos factores que llevarán a la ópera prácticamente a su desaparición en Valencia During the years 1900 - 1910 the opera was a popular art form in Valencian society. The large number …

Separātisms Eiropā: Katalonijas, Skotijas, Ziemeļitālijas gadījumu analīze

2019

Šī bakalaura darba temats ir “Separātisms Eiropā: Katalonijas, Skotijas, Ziemeļitālijas gadījumu analīze”. Separātisms kā politisks koncepts Eiropas Savienības valstīs ir izplatīts par spīti nacionālo valstu centieniem to novērst. Darba teorētisko ietvaru veido pašnoteikšanās, nacionālisma un separātisma teorijas, kas sniedz ieskatu svarīgākajos faktoros reģionu vēlmei atdalīties. Darba empīriskajā daļā caur izvēlētajiem separātisma veicinošajiem faktoriem tiks analizētas Katalonijas, Skotijas un Ziemeļitālijas atdalīšanās virzītājspēku pamatojums. Uzmanība tiks pievērsta separātisko kustību teiktajam un rakstītajam saistībā ar ekonomiku, nacionālismu, kulturālo identitāti un vēsturisko atm…

Source separation on hyperspectral cube applied to dermatology

2010

International audience; This paper proposes a method of quantification of the components underlying the human skin that are supposed to be responsible for the effective reflectance spectrum of the skin over the visible wavelength. The method is based on independent component analysis assuming that the epidermal melanin and the dermal haemoglobin absorbance spectra are independent of each other. The method extracts the source spectra that correspond to the ideal absorbance spectra of melanin and haemoglobin. The noisy melanin spectrum is fixed using a polynomial fit and the quantifications associated with it are reestimated. The results produce feasible quantifications of each source compone…

A bas les pères : Joseph Déjacque, liberté, antiautoritarisme

2016

International audience

Prise en eau par composites carbone/époxy et leur effet sur le comportement mécanique : application aux réparations de structures en composite par co…

2013

Le travail présenté dans ce mémoire avait pour objectif d’étudier le processus de la pénétration d'eau dans les composites en carbone/époxyde dans un premier temps, et dans un deuxième temps, d’étudier l’effet de la prise en eau par ces matériaux sur les performances mécaniques des composites et leur joints collés. L'intégration de ces phénomènes physiques dans la modélisation numérique est d'une grande importance dans la prédiction de la durabilité d’une structure en composite subissant un vieillissement hygrothermique. Par conséquent, ce travail consiste non seulement en des observations expérimentales, mais aussi en des simulations numériques. Des corrélations entre les résultats obtenus…

Prospects for advanced electron cyclotron resonance and electron beam ion source charge breeding methods for EURISOL

2011

International audience; As the most ambitious concept of isotope separation on line (ISOL) facility, EURISOL aims at producing unprecedented intensities of post-accelerated radioactive isotopes. Charge breeding, which transforms the charge state of radioactive beams from 1+ to an n+ charge state prior to postacceleration, is a key technology which has to overcome the following challenges: high charge states for high energies, efficiency, rapidity and purity. On the roadmap to EURISOL, a dedicated R&D is being undertaken to push forward the frontiers of the present state-of-the-art techniques which use either electron cyclotron resonance or electron beam ion sources. We describe here the gui…