Search results for "MARS"
showing 10 items of 384 documents
Synthesis and characterization of ethylene-1-hexene copolymers prepared by using MgCl2(THF)2-supported Ziegler-Natta catalysts
2000
Ethylene was copolymerized with 1-hexene over vanadium (VOCl3 and VCl4) and titanium (TiCl4) catalysts supported on MgCl2(THF)2 and activated with Et2AlCl. So far these catalyst systems have not been known as initiators of ethylene-1-hexene copolymerization. The vanadium catalysts were more active than the titanium catalyst and, at identical comonomer concentrations in the feed, gave rise to a greater incorporation of 1-hexene into the copolymer. Even at relatively low fractions of 1-hexene, the MgCl2(THF)2-supported catalysts affected much the copolymer properties like density, melting point and crystallinity.
El síndrome de quemarse por el trabajo (burnout) en profesionales de residencias de personas con discapacidad y su relación con las actitudes hacia l…
2018
Introducción. El Síndrome de Quemarse por el Trabajo (SQT) o Burnout es un síndrome psicológico (no una enfermedad mental) que se produce a causa de una respuesta prolongada al estrés en el lugar de trabajo (Maslach, 2003), un proceso que surge como respuesta al estrés laboral crónico y, por tanto, es un fenómeno que está vinculado a la aparición de riesgos psicosociales en el trabajo, un fenómeno subjetivo y de carácter negativo en el que entran en juego cogniciones, emociones y actitudes (negativas) hacia los otros en el trabajo, principalmente los usuarios o clientes (Gil-Monte, 2005). Aunque el SQT puede darse en diferentes colectivos profesionales, el mayor número de casos y las más im…
«Don aux églises et don d'églises dans le sud-est de la Gaule : du testament d'Abbon (739) aux chartes du début du XIe siècle»
2005
International audience; Aux vues de la documentation disponible concernant le sud-est de la Gaule, le traitement comparé des formes de transmission des patrimoines entre ceux qui disposent d'un honor ou d'une charge quelconque et ceux qui n'en disposent pas, ne peut être effectué qu'aux deux extrêmes de la fourchette chronologique qui nous occupe dans cette rencontre (VIIIe-Xe siècles). Ainsi, je propose d'analyser, en guise d'introduction, le testament d'Abbon, de 739, fondateur de l'abbaye de la Novalèse, recteur de la région de Suse et de la Maurienne, et probablement le dernier patrice de Provence. Ce document permet d'esquisser un tableau des cercles de parenté à l'intérieur desquels c…
ESSERE-L'AMATO: DONO E GRATITUDINE D'ESSERE
2013
La conoscenza riflessa di sé è un dono; questo permette di giustificare una ontologia della persona come essere-l'amata. L'esistenza, in questa prospettiva, è vista ed intesa come un dono offerto per un compito responsabile
Lakeja tarvitaan, koska ihminen on itsekäs
2019
Changes in the benthic algal flora and vegetation of a semi-enclosed Mediterranean coastal lagoon (Stagnone di Marsala, Western Sicily)
2014
È stato condotto uno studio sulla flora e vegetazione macroalgale dello Stagnone di Marsala (Trapani) con l’obiettivo di fornire una revisione dei dati riportati in letteratura ed esaminare i principali cambiamenti che si sono verificati nell’intera area negli ultimi tre decenni. La flora algale è risultata più povera rispetto al passato (94 taxa contro 108), mostrando un incremento delle Cloroficee e una riduzione delle Rodoficee e delle Feoficee. Solo 48 taxa sono stati riportati precedentemente, mentre 46 sono nuovi per lo Stagnone. Tra questi, è interessante sottolineare sia da un punto di vista floristico che ecologico, il ritrovamento per la prima volta dell’alga bruna Cystoseira comp…
The Coastal Levantine Area
2017
The Coastal Levantine area is a very diverse territory situated between the Cap de Creus and the Cap de la Nau. The wide variety of environments and ecological conditions that occur in this area determine its great diversity and richness from the vegetation point of view. Forest composition depends mainly on climatic factors, geomorphology and soil features, and are currently dominated by evergreen sclerophyllous (Quercus ilex, Q. rotundifolia, Q. suber), conifer (Pinus halepensis, P. pinaster, P. pinea, P. salzmannii, P. sylvestris), and deciduous (Fagus sylvatica, Quercus petraea) and semi-deciduous (Quercus faginea, Q. canariensis, Q. pubescens, Q. pyrenaica) species in inland areas with…
Geoarchaeological evidence of marshland destruction in the area of Rungholt, present-day Wadden Sea around Hallig Südfall (North Frisia, Germany), by…
2018
Abstract Geophysical and geoarchaeological investigations were carried out in the Wadden Sea of North Frisia (Schleswig-Holstein, Germany) to elucidate major environmental changes that considerably altered the coastal landscape since medieval times. Between the 12 th and 14 th cent. AD, the present-day tidal flats around the marsh island Hallig Sudfall belonged to the historical Edomsharde district and its main settlement Rungholt . For North Frisia, it is well known that during medieval and early modern times, extreme storm surges caused major land losses associated with a massive landward shift of the coastline. Today, cultural traces like remains of dikes, drainage ditches, terps or even…
Environmental evidence of Valencia lagoon coastal barrier stabilization from 8500 BP to Present. Climate and eustatic variations
2020
Abstract The Albufera de Valencia is one of the largest lagoon in the Spanish Mediterranean. Two continuous borehole cores reaching depths of 8 and 14 m in the northern part of the lagoon underwent sedimentological, micropaleontological and biological study. The organic content was also analysed, and 14C radiometric dating and amino acid racemization were performed. Study of the content of benthic foraminifera and n-alkanes and alkanoic acids in the lagoon sedimentary record identified several periods. The core records showed seven different environments: alluvial; freshwater marsh; brackish marsh; brackish lagoon; brackish lagoon with marine connection, backbarrier flat, and backshore. The…
Consolidation by Game-Playing: a Gamesmanship Inquiry into Forestry Industry
2006
If one takes a flight in Finland from the country’s capital, Helsinki, for instance, north to Rovaniemi, the ‘Gateway to Lapland’, the scenery below consists typically of lakes, rivers and marshland, but most of all of forests. Wood in all its forms has been for centuries the core of the national character as well as the locomotive of business in Finland. Over the years the Finns have come to understand that the forest sector is perhaps the strongest guarantor of the Finnish economy and identity. The old saying ‘Finland earns its living from its forests’ can even be interpreted to mean ‘what is good for the forest sector is good for Finland’. Lilja, Tainio and Rasanen (1991a) encapsulated t…