Search results for "DEB"

Conservation of threatened habitat types under future climate change – Lessons from plant-distribution models and current extinction trends in southe…

2015

A higher risk of future range losses as a result of climate change is expected to be one of the main drivers of extinction trends in vascular plants occurring in habitat types of high conservation value. Nevertheless, the impact of the climate changes of the last 60 years on the current distribution and extinction patterns of plants is still largely unclear. We applied species distribution models to study the impact of environmental variables (climate, soil conditions, land cover, topography), on the current distribution of 18 vascular plant species characteristic of three threatened habitat types in southern Germany: (i) xero-thermophilous vegetation, (ii) mesophilous mountain grasslands (…

On the formation of maars

1973

The Pleistocene maars in the Eifel region of Germany, and Massif Central in France, formed when fissures opened at the bottom of older valleys allowing stream water to pour down them and come into contact with rising magma. The resulting phreato-magmatic eruptions gave rise to both base surge and air-fall deposits. Spalling of wall rock at depth enlarged the fissure into an eruption chamber. Subsidence along a ring fault into the eruption chamber accounts for the larger crater cut into the country rocks. The volume relationship between the crater excavated, the ejected pyroclastic debris of the rim and the volume below the floor of the crater, indicates that the volume of the maar ejecta is…

Behind the curtain of international diversification: An agency theory perspective

2018

This paper dissects the antecedents of international diversification through the lens of the agency cost of free cash flow arguments. It explores whether the partial convergence of interests among managers, majority shareholders, and minority shareholders affects a firm's choice to diversify internationally. Using a sample panel of 60 Italian firms evaluated longitudinally from 2004 to 2014, the study tests whether a firm's international diversification is affected by its free cash flow (as the ultimate source of managerial discretion) and debt (as the main constraint to managerial discretion), especially in firm contexts that exacerbate agency problems. We find that the effects on internat…

In giro per la Sicilia: Attrattive e pericoli secondo le guide turistiche

2008

Contemporary spatial and environmental factors determine vascular plant species richness on highly fragmented meadows in Central Finland

2018

Context Habitat loss is a major threat to biodiversity. It can create temporal lags in decline of species in relation to destruction of habitat coverage. Plant species specialized in semi-natural grasslands, especially meadows, often express such extinction debt. Objectives We studied habitat loss and fragmentation of meadows and examined whether the changes in meadow coverage had caused an extinction debt on vascular plants. We also studied whether historical or present landscape patterns or contemporary environmental factors were more important determinants of species occurrence. Methods We surveyed the plant species assemblages of 12 grazed and 12 mown meadows in Central Finland and dete…

Tematiikan, harmonian ja äänenkuljetuksen koherenssi Claude Debussyn pianoetydissä "pour les octaves"

2000

Low temperature heat capacity of phononic crystal membranes

2016

Phononic crystal (PnC) membranes are a promising solution to improve sensitivity of bolometric sensor devices operating at low temperatures. Previous work has concentrated only on tuning thermal conductance, but significant changes to the heat capacity are also expected due to the modification of the phonon modes. Here, we calculate the area-specific heat capacity for thin (37.5 - 300 nm) silicon and silicon nitride PnC membranes with cylindrical hole patterns of varying period, in the temperature range 1 - 350 mK. We compare the results to two- and three-dimensional Debye models, as the 3D Debye model is known to give an accurate estimate for the low-temperature heat capacity of a bulk sam…

Transarteriālas ķīmijterapijas pielietošana aknu audzēju ārstēšanā

2016

Ievads: Transarteriāla ķīmijembolizācija ar medikamentus izdalošām mikrosfērām (DEB-TACE) ir audzēja apasiņojošo artēriju oklūzija digitālās subtrakcijas angiogrāfijas laikā, izmantojot mikrosfēras piesūcinātas ar ķīmijembolizācijas materiālu, kas pēc ievades pagarina saskares laiku starp audzēja šūnām un ķīmijterapijas medikamentiem. DEB-TACE tiek plaši pielietota hepatocelulārās karcinomas (HCC) paliatīvajā ārstēšanā, kad rezekcija vai ablācija nav iespējama. DEB-TACE tiek izmantota arī citu hipervaskulāru nerezicējamu aknu audzēju, piemēram, holangiokarcinomas, kolorektālu aknu metastāžu ārstēšanā. Optimāli kandidāti ārstēšanai ir Child-Pugh A un B klases pacienti ar lielu vai multifokāl…

Debate académico de puertas abiertas como herramienta para estimular el pensamiento crítico y la orientación científica: una experiencia piloto

2018

Se presenta una experiencia piloto realizada durante la primavera de 2018 en el Jardí Botànic de la Universitat de València. La experiencia reunió a 24 estudiantes de las titulaciones de Sociología, Educación Primaria y Psicología de la misma universidad (6 estudiantes de cada titulación), más 6 estudiantes de diferentes titulaciones académicas, incluyendo máster y doctorado. El objetivo principal del estudio piloto es analizar la percepción y la efectividad de un seminario de debate académico llevado a cabo al aire libre, y con la participación de alumnos de diferentes ámbitos académicos. Se organizó en tres sesiones de tres horas cada una, con una distribución preestablecida de roles entr…

Lignin recovery from spent alkaline pulping liquors using acidification, membrane separation, and related processing steps: A Review

2019

The separation of lignin from the black liquor generated during alkaline pulping is reviewed in this article with an emphasis on chemistry. Based on published accounts, the precipitation of lignin from spent pulping liquor by addition of acids can be understood based on dissociation equilibria of weak acid groups, which affects the solubility behavior of lignin-related chemical species. Solubility issues also govern lignin separation technologies based on ultrafiltration membranes; reduction in membrane permeability is often affected by conditions leading to decreased solubility of lignin decomposition products and the presence of colloidal matter. Advances in understanding of such phenomen…