Search results for "ACC"

showing 10 items of 15276 documents

High Energy Emission and its Variability in Young Stellar Objects

2019

Young stars show a variety of highly energetic phenomena, from accretion and outflow processes to hot coronal plasmas confined in their outer atmosphere, all regulated by the intense stellar magnetic fields. Many aspects on each of these phenomena are debated, but, most notably, their complex mutual interaction remains obscure. In this work I report how these phenomena are simultaneously responsible for the high-energy emission from young stars, with a special focus on the expected and observed variability in the X-ray band. Investigating variations in the X-ray emission from young stars allows us to pose constraints on flare and coronal plasma properties, coronal heating, accretion stream …

starsYoung stellar objectAstrophysics::High Energy Astrophysical PhenomenaMagnetosphereFOS: Physical sciencesAstrophysicsAstrophysics::Cosmology and Extragalactic Astrophysics01 natural scienceslaw.inventionX-raySettore FIS/05 - Astronomia E Astrofisicaaccretionstarlaw0103 physical sciencesAstrophysics::Solar and Stellar Astrophysics010303 astronomy & astrophysicspremain sequenceSolar and Stellar Astrophysics (astro-ph.SR)Astrophysics::Galaxy AstrophysicsPhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)010308 nuclear & particles physicsactivityAstronomy and AstrophysicsPlasmaAccretion (astrophysics)StarsT Tauri starAstrophysics - Solar and Stellar AstrophysicsSpace and Planetary ScienceT Tauri starOutflowAstrophysics::Earth and Planetary AstrophysicsAstrophysics - High Energy Astrophysical PhenomenaFlare
researchProduct

Evidence of a non-conservative mass transfer in the ultra-compact X-ray source XB 1916-053

2020

The dipping source XB 1916-053 is a compact binary system with an orbital period of 50 min harboring a neutron star. Using ten new {\it Chandra} observations and one {\it Swift/XRT} observation, we are able to extend the baseline of the orbital ephemeris; this allows us to exclude some models that explain the dip arrival times. The Chandra observations provide a good plasma diagnostic of the ionized absorber and allow us to determine whether it is placed at the outer rim of the accretion disk or closer to the compact object. From the available observations we are able to obtain three new dip arrival times extending the baseline of the orbital ephemeris from 37 to 40 years. From the analysis…

stars: individual: XB 1916-053Astrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsCompact star01 natural sciencesLuminositystars: neutronX-rays: binariesaccretion0103 physical sciences010303 astronomy & astrophysicsAstrophysics::Galaxy AstrophysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)Physics010308 nuclear & particles physicsaccretion disksApsidal precessionAstronomy and AstrophysicsMass ratioOrbital periodRedshiftNeutron starSpace and Planetary ScienceAstrophysics::Earth and Planetary AstrophysicsAstrophysics - High Energy Astrophysical Phenomena[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]Gravitational redshiftAstronomy & Astrophysics
researchProduct

Regulación del factor transcripcional Whi7 y la proteinquinasa C en el proceso de Start y el checkpoint de integridad del DNA

2019

Start es el principal punto de control del ciclo celular en el que las células se comprometen a una nueva ronda de división celular. Este punto de control implica la activación irreversible de un programa transcripcional por los complejos Cdc28-Cln a través de la inactivación del represor transcripcional de Start Whi5. En este trabajo se proporcionan nuevas claves sobre cómo Whi7, una proteína relacionada a nivel de secuencia con Whi5, reprime Start. Nuestros resultados demuestran que Whi7 es un parálogo genuino de Whi5. Ambas proteínas colaboran en la represión de Start, aunque presentan diferencias importantes en su regulación que convierten a Whi7 en el represor de Start por excelencia e…

startwhi7UNESCO::CIENCIAS DE LA VIDAsaccharomyces cerevisiaeciclo celularestrés celular:CIENCIAS DE LA VIDA [UNESCO]represor transcripcionalcheckpoint de integridad del DNAisoforma PKCδ de mamíferos
researchProduct

Intervista a Dario Maccarrone

2017

Il contributo riporta gli esiti dell'intervista effettuata a Dario Maccarrone, curata dall'autore dell'articolo, in riferimento al ruolo delle startup nei territori interni.

startup acceleratore d'impresa sviluppo localeSettore ICAR/21 - Urbanistica
researchProduct

Using uncertain preferential information from stakeholders to assess the acceptability of alternative forest management plans

2017

In forest management planning, participatory planning processes are often encouraged as a means to acquire relevant information and to enhance the stakeholders' acceptability of alternative plans. This requires the aggregation of the stakeholders' preferences that can be done in a wide variety of manners. The aggregation process strives to reduce the information into a single set of preferences that simplifies the information and allows for the use of discrete decision support tools. Depending on how the preferences are aggregated, a wide range of plan rankings can emerge. Although this range of ranking complicates the issue of plan selection, it does highlight the uncertainty involved in a…

stochastic multicriteria acceptability analysisstochastic preferencesComputer scienceStrategy and Managementpäätöksentekostokastinen monikriteerinen arvostusanalyysiForest management0211 other engineering and technologiesGeneral Decision Sciences02 engineering and technologypairwise comparisonsstochastic programminggroup decision makingsidosryhmätryhmätEnvironmental planning040101 forestryStochastic multicriteria acceptability analysis021103 operations researchbusiness.industryEnvironmental resource management04 agricultural and veterinary sciences15. Life on landStochastic programmingGroup decision-makingta11810401 agriculture forestry and fisheriesPairwise comparisonmetsänhoitobusinessosallistava suunnitteluJournal of Multi-Criteria Decision Analysis
researchProduct

Sterilizing effects of the Erbium : Yag laser upon dental structures: An in vitro study

2006

An evaluation was made of the sterilizing effects of the Erbium: YAG laser at different power ratings upon dental structures in vitro. An in vitro study was made of 47 single-root teeth removed for periodontal reasons in the Oral and Maxillofacial Surgery Teaching Unit (Department of Medicine and Orofacial Surgery, Madrid Complutense University Dental School, Spain). The teeth were divided into three laser irradiation groups (250, 350 and 450 mJ) and a non-irradiated control group. The teeth were then immersed in an enrichment medium for 72 hours under conditions of anaerobiosis, with visual controls after 24, 48 and 72 hours. Posteriorly, microbiological cultures were made in blood agar to…

stomatognathic diseasesLáseresExtracción dentalUNESCO::CIENCIAS MÉDICASOdontología:CIENCIAS MÉDICAS [UNESCO]
researchProduct

Evolución del germen dental trasplantado heterotópicamente en la dermis: un estudio histológico en la rata

2004

En este estudio hemos analizado la potencialidad de desarrollo del germen dental en fase de corona. Para ello, los gérmenes dentales de rata recién nacida fueron trasplantados en las bolsas dérmicas de la oreja de ratas isogénicas. Siete y catorce días después del trasplante, se desarrollaron las estructuras morfológicas dentales típicas, con ameloblastos y odontoblastos bien diferenciados. Ulteriormente, los procesos de reacción inflamatoria del tejido huésped con infiltración celular abocaron a la desaparición de los tejidos dentales. Desde el primer momento de nuestro análisis, los trasplantes desarrollaron una dentina anómala u osteoide cuyo tamaño fue paulatinamente incrementando con e…

stomatognathic diseasesdentinastomatognathic systemtejido osteoideUNESCO::CIENCIAS MÉDICASOdontologíatrasplanteodontoblastoreacción odontoblástica:CIENCIAS MÉDICAS [UNESCO]Ciencias de la saludGermen dental
researchProduct

Recensione a C. Ginzburg, Il filo e le tracce. Vero falso finto

2006

Che relazione si instaura nella conoscenza storica tra il vero, il falso e il finto? È possibile indagare le tracce del loro intreccio? La contrapposizione di questi tre poli, la loro mutevole dialettica, che costituiscono più ampiamente il «nostro stesso modo di stare al mondo», sono oggetto del libro di Carlo Ginzburg. La recensione prende in considerazione alcuni dei 15 capitoli che compongono il libro, che hanno per oggetto argomenti complessi ed eterogenei, provando a restituire al lettore il groviglio di complessi rimandi che costituisce in Ginzburg la trama del racconto storico.

storia culturaleVerità e finzione nel racconto storico
researchProduct

Singolare caso di omicidio per rapina con duplice meccanismo lesivo: strangolamento e accoltellamento

2007

gli autori descrivono un caso di omicidio perpetrato con duplice meccanismo lesivo, strangolamento ed accoltellanento, ai danni del direttore di un Ufficio postale, in occasione di una rapina. Detta forma omicidiaria complessa è indicativa di una reiterata e crudele violenza, cui il soggetto ha cercato vanamente di sottrasi, come dimostrato dalle lesioni da difesa riscontrate alle mani.

strangolamento accoltellamento omicidio
researchProduct

A compliance style of enforcement: il gusto di rispettare le regole

2008

Di fronte alla consapevolezza della complessità, varietà ed incertezza del tema ambiente e della sua tutela non è parso più possibile individuare strumenti e soluzioni ideal-tipici, espressi dalla legge, validi a prescindere dal tempo in cui vengono impiegati e dal contesto su cui insistono, e frutto in ogni caso della elaborazione unilaterale del legislatore. Da qui un articolato e diffuso movimento di ripensamento del tradizionale sistema di regolazione di matrice pubblicistica in materia ambientale indicato solitamente con il sintagma command and control, in base al quale le tre funzioni principali del processo di regulation (fissazione degli standard di condotta dei soggetti regolati – …

strategie di regolazioneambienteaccordo in materia di ambiente
researchProduct