Search results for "CF"
showing 10 items of 701 documents
Etude numérique du comportement thermique d’un séchoir solaire utilisant un lit thermique pour le stockage d’énergie
2018
This thesis presents a numerical study of an indirect natural convection solar dryer for drying agricultural products (Figs). The first part analyzes a solar dryer containing a drying chamber coupled to a reversed absorber and a solar chimney. Simulations were made to determine the dynamic and thermal fields under the influence of the variation of the solar chimney configuration and the size of the inlet opening. The governing equations based on the standard k-ε turbulence model are solved by the finite volume method using the ANSYS-Fluent commercial code. The second part analyzes the effect of adding a thermal storage in the form of a gravel bed in the drying chamber. The bed is modeled as…
Cilvēka parvovīrusa B19 infekcijas marķieru un aktivīna B klātbūtne pacientiem ar ME/CF
2021
Mialģiskais encefalomielīts jeb hroniskā noguruma sindroms ir augsti heterogēna slimība ar nezināmu etiopatoģenēzi. Aktuāla ir nepieciešamība pēc ME/CFS biomarķieru atklāšanas un pacientu stratifikācijas. Iespējams, ME/CFS iedalījums varētu būt ar infekciju saistīta saslimšana. Tādēļ šajā darbā tika pārbaudīta B19 infekcijas marķieru klātbūtne un aktivīna B, potenciālā biomarķiera, koncentrācija ME/CFS pacientiem. Pētījuma ietvaros noteica B19 specifisko IgG/IgM klases antivielu klātbūtni, aktivīna B koncentrāciju, lietojot ELISA testus, un B19 NS genoma sekvences nPCR pilnu asiņu un no šūnām brīvas asins plazmas DNS paraugos ME/CFS pacientiem un praktiski veseliem asins donoriem (PVAD). Ie…
ANALISI STRUTTURALE DI UN TIMONE PER ALISCAFI
2012
Attualmente i sistemi di controllo direzionale (timone) e di stabilità (flap) dei battelli veloci per il trasporto passeggeri (HSC) sono realizzati con elementi scatolari in acciaio. Ciò è essenzialmente dovuto alle notevoli sollecitazioni idrodinamiche che tali elementi sopportano a causa dell’elevata velocità di crociera. L’esigenza di ridurre il peso di tali elementi e di aumentarne la resistenza alle azioni corrosive esterne spinge ad una ricerca su materiali e tecnologie di fabbricazioni innovative. In questo studio è presentato il progetto di un timone, realizzato in materiale ibrido composito e acciaio, da impiegare su un battello per trasporto veloce passeggeri.
Analisi e sviluppo di imbarcazioni a sostentamento idrodinamico
The metabolic responses to electrical pulse-induced contractions in C2C12 myotubes are greater in high glucose medium
2021
Osaa liikunnan terveyshyötyjen mekanismeista on vaikeaa tutkia ihmisillä tai koe-eläimillä. Viljeltyjen C2C12 myotuubien sähköpulssistimulaatiolla (EPS, engl. electrical pulse stimulation) voidaan mallintaa lihassupistuksia ja liikuntaa in vitro –olosuhteissa. EPS:n vaikutusta C2C12 myotuubien aineenvaihduntaan ei kuitenkaan tunneta tarkasti. Lisäksi C2C12 myotuubeja viljellään yleensä korkeassa ei-fysiologisessa 25 mM glukoosipitoisuudessa, mikä voi vaikuttaa EPS-vasteisiin. Tässä tutkimuksessa C2C12 myotuubeja sähköpulssistimuloitiin 24 tunnin ajan sekä matalan 5.5 mM (MG) että korkean 25 mM (KG) glukoosipitoisuuden olosuhteissa, ja aineenvaihduntatuotteiden konsentraatiot analysoitiin se…
Spatialité, participation et déploiement : la reprise du contact du personnel de service à la table des clients lors d’un repas au restaurant
2014
1. Introduction Ce chapitre propose de se focaliser sur un problème pratique rencontré de manière récurrente par les participants à l’interaction lors d’un repas au restaurant. Il s’agit d’analyser, de manière systématique, comment le personnel de service rétablit le contact avec le(s) client(s) à plusieurs reprises durant le repas avec une focale particulière sur les modalités par lesquelles le personnel de service initie régulièrement l’interaction avec les clients à la table afin de mener ...
Development of anode supported Single Chamber Solid Oxide Fuel Cells running in air/methane mixture
2013
International audience; Single Chamber Solid Oxide Fuel Cells (SCFC) show a growing interest and are the concern of more and more papers. In such device, anode and cathode are ex-posed to a gas mixture of fuel (hydrocarbon) and oxidant (air) so that no more sealing with electrolyte is necessary. Their operating principle is based on the different catalytic activities of anode and cathode: Ideally, the anode has to be active for the oxidation of fuel while the cathode should present only a strong electro-activity for oxygen reduction. In this paper, we present the development of an anode supported SCFC device running in air/methane mixture characterized by their volume ratio, Rmix = CH4/O2.
New 1,2,4-oxadiazole nortopsentin derivatives with cytotoxic activity
2019
New analogs of nortopsentin, a natural 2,4-bis(3&prime
Phytochemical profile of three Ballota species essential oils and evaluation of the effects on human cancer cells
2017
Three Ballota species, Ballota undulata, Ballota saxatilis and Ballota nigra ssp. foetida, were investigated for their cytotoxicity against two human cancer cells, hepatoma HepG2 cell line and breast cancer MCF-7 cell line, and for their antioxidant activity. The chemical composition of essential oils was studied by GC and GC–MS. Sesquiterpenes were the main constituents. The most antiproliferative essential oil against HepG2 cells was B. undulata with a percentage of inhibition of 81.36 ± 3.54 at a concentration of 100 μg/mL, while against MCF-7 cells essential oil from B. saxatilis was the most active with a percentage of inhibition of 24.18 ± 1.13 at a concentration of 100 μg/mL. The ant…
Synthesis and Antitumor Activity of New Thiazole Nortopsentin Analogs
2016
New thiazole nortopsentin analogs in which one of the two indole units was replaced by a naphthyl and/or 7-azaindolyl portion, were conveniently synthesized. Among these, three derivatives showed good antiproliferative activity, in particular against MCF7 cell line, with GI50 values in the micromolar range. Their cytotoxic effect on MCF7 cells was further investigated in order to elucidate their mode of action. Results showed that the three compounds act as pro-apoptotic agents inducing a clear shift of viable cells towards early apoptosis, while not exerting necrotic effects. They also caused cell cycle perturbation with significant decrease in the percentage of cells in the G0/G1 and S ph…