Search results for "gas [argon]"

Infrared evolved gas analysis during thermal investigation of lanthanum, europium and samarium carbonates

2003

Abstract The characterisation of rare earth elements carbonates (REECs) was performed by thermal analysis (TG–DTG) combined with simultaneous infrared evolved gas analysis–Fourier transform infrared (EGA–FTIR) spectroscopy. The TG–DTG curves were obtained using the Perkin-Elmer PC series TGA-7 thermogravimetric analyser in the temperature range 25–800 °C both in dynamic air and nitrogen atmosphere. La 2 (CO 3 ) 3 · n H 2 O, Eu 2 (CO 3 ) 3 · n H 2 O and Sm 2 (CO 3 ) 3 · n H 2 O were analysed, the dehydration and decarbonation steps were investigated and the water content was calculated. The trace rare earth elements in lanthanum, europium and samarium carbonates were determined by Philips PU…

Protocols for UV camera volcanic SO2 measurements

2010

Abstract Ultraviolet camera technology offers considerable promise for enabling 1 Hz timescale acquisitions of volcanic degassing phenomena, providing two orders of magnitude improvements on sampling frequencies from conventionally applied scanning spectrometer systems. This could, for instance enable unprecedented insights into rapid processes, such as strombolian explosions, and non-aliased corroboration with volcano geophysical data. The uptake of this technology has involved disparate methodological approaches, hitherto. As a means of expediting the further proliferation of such systems, we here study these diverse protocols, with the aim of suggesting those we consider optimal. In part…

Water chemistry and abiogenic methane content of a hyperalkaline spring related to serpentinization in the Argolida ophiolite (Ermioni, Greece)

2018

Abstract Hyperalkaline mineral springs related to active continental serpentinization are a theme of growing interest since they may contain significant amounts of abiotic gas and have important implications for energy resource exploration, subsurface microbiology and astrobiology. We report the discovery of a new hyperalkaline (pH∼12) spring issuing in the Agioi Anargyroi monastery at Ermioni (Greece), connected to serpentinization of peridotites of the Argolis ophiolite. Two water samples have been collected from separated springs and analysed for the chemical composition of major, minor and trace elements, and isotopic composition (2H and 18O) of water by IC, ICP-OES, ICP-MS and IRMS, an…

Problematiche energetiche e sviluppi connessi alla combustione double fuel

2014

Estimation of the geogenic carbon degassing of Greece

2019

Abstract Greece belongs to the most geodynamically active regions of the world and as such it has to be considered an area of intense geogenic degassing. Here we review all the papers already published in the scientific literature on both the geochemistry of gas manifestations and the CO2 and CH4 release, in an attempt to obtain the first nationwide inventory of the natural output of these carbon gases in Greece. The best studied and most exhaling area is the South Aegean Active Volcanic Arc (SAAVA), which releases more than 1.3 × 105 tons of CO2 per year. Continental Greece, on the contrary, is much less studied but may release CO2 in the same order of magnitude in its eastern-central and …

Eugen Alt † 17./29. April 1891: Erinnerungsblätter für seine Freunde

1891

Gotiskajā šriftā

Origin of He and CO2 in the gas manifestations of Greece.

2018

In the period from 2004 to 2017, more than 350 samples of free and dissolved gases were collected along the whole Hellenic area. Some literature data have also been taken into consideration (Rizzo et al., 2016). Samples have been analysed for their chemical and isotope composition. The concentrations range from 0.10 to 3370 μmol/mol for He, 600 to 995,000 μmol/mol for N2, 0.60 to 915,000 μmol/mol for CH4 and 17 to 1,002,000 μmol/mol for CO2, whereas the isotope values range from 0.01 to 7.10 for R/RA and -29.91 to +6.00 for δ13C-CO2. Considering the R/RA and 4He/20Ne ratios the atmospheric, mantle and crustal contributions for He have been calculated (Sano and Wakita, 1985). The highest man…

Der Säure-Basenstatus und die CO2-Transportfunktion des mütterlichen und fetalen Blutes zum Zeitpunkt der Geburt

1965

Als Voraussetzung fur die Analyse des Gasaustausches in der menschlichen Placenta werden die charakteristischen Daten fur den CO2-Transport und den Saure-Basenstatus im mutterlichen und fetalen Blut zum Zeitpunkt der Geburt bestimmt. Dabei ergeben sich als Mittelwerte bei 54 Fallen normaler Spontangeburt mit einzeitiger Entwicklung des Kindes, bei denen samtliche Meswerte vorliegen:

Effects of soil gas permeability and recirculation flux on soil CO2 flux measurements performed using a closed dynamic accumulation chamber

2009

Abstract Dynamic accumulation chamber methods have been extensively used to estimate the total output of CO2 released from active volcanic area. In order to asses the performance and reliability of a closed dynamic system several tests were carried out with different soil permeabilities and soil CO2 fluxes. A special device was used to create a constant one-dimensional CO2 flux through a soil column with a known permeability. Three permeabilities were investigated, ranging between 3.6 × 10− 2 and 3.5 × 10 μm2, as were several CO2 fluxes (ranging between 1.1 × 10− 6 and 6.3 × 10− 5 kg m− 2 s− 1). The results highlight that the accuracy of soil CO2 flux measurements strictly depends on the so…

Rīgas apkārtnes muižu attēlojums J.K. Broces “Zīmējumos un aprakstos”

2019

Maģistra darba ietvaros tiek veikts pētījums un veidots koptēls par Rīgas apkārtnes muižām, pamatojoties pedagoga, vēsturnieka, novadpētnieka J.K.Broces zīmētajiem, aprakstītajiem un apkopotajiem materiāliem no 1771. gada līdz 1818. gadam, kas tika publicēti krājumā 4 sējumos (1992-2007). Darbā tiek izmantoti pirmie 2 sējumi, kuros atspoguļota Rīga un tās tuvākā apkārtne. 18. gs. beigās un 19. gs. sākumā spilgta tendence bija muižu straujais pieaugums. Tās kalpoja īpašnieku prestižam, atpūtai, saimnieciskai darbībai un ekonomiskai izaugsmei. Rīgas apkārtnes muižiņu apbūve ir izzūdoša, tāpēc svarīgi, pēc iespējas vairāk un dažādos veidos pievērst uzmanību šim kultūras mantojumam. Muižiņu tēm…