Search results for "Roth"
showing 10 items of 806 documents
CO2 release to the atmosphere from thermal springs of Sperchios Basin and northern Euboea (Greece): The contribution of “hidden” degassing
2020
Abstract Greece is a region characterised by intense geodynamic activity that favours the circulation of hydrothermal fluids in the crust transporting volatiles from either the deep crust or the mantle to the surface. Elevated heat flow values are detectable at Sperchios Basin and North Euboea (central Greece), two areas defined by a system of deeply rooted extensional faults and Quaternary volcanic activity. This setting contributed to the formation of numerous hydrothermal systems, which are mostly expressed as CO2-rich thermal springs with intense bubbling. The CO2 output from six bubbling pools has been determined by flux measurements with the use of the floating chamber method. The hig…
Hydrothermal alteration can result in pore pressurization and volcano instability
2021
AbstractThe collapse of a volcanic flank can be destructive and deadly. Hydrothermal alteration is common to volcanoes worldwide and is thought to promote volcano instability by decreasing rock strength. However, some laboratory studies have shown that not all alteration reduces rock strength. Our new laboratory data for altered rhyodacites from Chaos Crags (Lassen volcanic center, California, USA) show that pore- and crack-filling mineral precipitation can reduce porosity and permeability and increase strength, Young's modulus, and cohesion. A significant reduction in permeability, by as much as four orders of magnitude, will inhibit fluid circulation and create zones of high pore fluid pr…
Na beztydzień i od święta - o tradycyjnych zupach w śląskim menu
2018
Przedmiotem niniejszego artykułu jest śląskie menu ze szczególnym uwzględnieniem tradycyjnych zup, czyli polewek. Na podstawie materiałów archiwalnych oraz materiałów pozyskanych w trakcie prowadzonych badań terenowych wśród ludności autochtonicznej dwóch województw: opolskiego i śląskiego (w latach 2007-2017) omówiono w nim wybrane, charakterystyczne zupy spożywane w ciągu tygodnia oraz te obowiązujące w dni świąteczne. Zwrócono w nim także uwagę na przemiany, jakim one podlegały w ciągu wieków. W opracowaniu zaprezentowane zostały następujące zupy. zupy z chleba, tj. wodzionka, germuszka i biermuszka-, dalej zaś żur, siemieniotka/konopiotka, rosół i rosół z młodzików.
Effectiveness of low flow vascular lesions sclerosis with monoetanolamine: Report of six cases
2007
Vascular malformations or even hemangiomas need therapeutic intervention if they start to cause clinical symptoms or personal discomfort. Different therapeutic modalities, including cryotherapy, corticosteroids, laser therapy, sclerotherapy, surgery, and/or embolization, can be performed successfully. Sclerotherapy with monoethanolamine is a relatively simple and effective method to treat low flow vascular lesions. We presented a report of six cases of vascular malformations treated with monoethanolamine. There were 3 male and 3 female patients, with an age range of 20 to 68 years. The patients were submitted to applications according to clinical response and/or tolerability. In all cases, …
O. Aleksandra Krzysztofa Sitnika OFM badania nad dziejami polskich bernardynów (dorobek historiograficzny 2006–2019)
2020
O. Aleksander Krzysztof Sitnik OFM (ur. 1971 r.) należy do franciszkańskiej gałęzi Zakonu Braci Mniejszych prowincji Niepokalanego Poczęcia NMP, nazywanych w Polsce bernardynami. W swoich pracach podejmuje zagadnienia dotyczące szeroko rozumianych dziejów prowincji bernardyńskich Zakonu Braci Mniejszych w Polsce, począwszy od 1453 r. Badania te poświęca dziejom poszczególnych klasztorów z gałęzi męskiej i żeńskiej, a ich dyskurs historyczny doprowadza do czasów współczesnych, ponieważ, jak sam uważa, atmosfera po 1945 r. nie sprzyjała wydawaniu dzieł analizujących dzieje Kościoła w Polsce, ani tym bardziej zgłębiających działalność zakonów. Autor prowadzi także badania naukowe z pogranicza …
Biomass Waste Processing into Artificial Humic Substances
2021
Abstract To address the biomass waste processing problem and transform it into refractory forms of carbon, recently suggested hydrothermal carbonization (HTC) of biomass in alkaline environment can be considered as a prospective and climate neutral approach. Biomass HTC provides possibilities to obtain form of biochar (hydrochar) and artificial humic substances, however the conditions of the HTC have not been much studied. Optimization by Response Surface Methodology of the HTC using microwave treatment with three experimental variables (treatment temperature, length of microwave treatment, amount of biomass per volume) provides the possibility to significantly increase the yield of humic s…
Hydrothermal liquefaction of sewage sludge: towards the effects of transition metals in the presence of homogeneous hydrogen producers
2022
Waste carbonaceous matrices, such as sewage sludge (SS) seem to have a great potential, because they are namely costless matrices compared to the microalgae and hydrothermal liquefaction (HTL) can be considered an interesting route to dispose and valorize them [1-5]. However, SS are characterized by high amount of non-biogenic fractions, such as plastics, salts and metals. In particular SS contains a high amount of inorganics [5], such as Al, Ba, Ca, Cr, Cu, Fe, Ni, K, Mg, Mn, Na, P, S, Ti, Zn, Si which are distributed in the products at the end of the reaction. The presence of heavy metals represent a big challenge for the implementation of HTL on the industrial scale as they can affect pr…
Numerical modelling of gas-water-rock interactions in volcanic-hydrothermal environment: the Ischia Island (Southern Italy) case study.
2012
Hydrothermal systems hosted within active volcanic systems represent an excellent opportunity to investigate the interactions between aquifer rocks, infiltrating waters and deep-rising magmatic fluids, and thus allow deriving information on the activity state of dormant volcanoes. From a thermodynamic perspective, gas-water-rock interaction processes are normally far from equilibrium, but can be represented by an array of chemical reactions, in which irreversible mass transfer occurs from host rock minerals to leaching solutions, and then to secondary hydrothermal minerals. While initially developed to investigate interactions in near-surface groundwater environments, the reaction path mode…
The Ischia Island hydrothermal system: an integrated multidisciplinary (geochemical, geophysical and geological) study
2011
Ischia Island is the emergent portion of a large volcanic complex on the Gulf of Naples (Southern Italy). Ischia volcano has undertaken a complex evolution since 150 ka b.p., with prolonged cycles of effusive and explosive eruptions alternated with quiescence periods (the most recent of which started after the 1302 A.D. Arso eruption). Currently, hot springs (with discharge temperature up to 90 C), fumarolic gas emissions with CO2 up to 97%, and diffuse soil degassing testify a persistent activity state of the Ischia volcano. Ischia Island is a very good example of an active volcano hosting a large hydrothermal system and, in particular, its south-western sector has long been known to be th…