نتایج جستجو برای: solvent degassing
تعداد نتایج: 56841 فیلتر نتایج به سال:
Dome growth at the Soufriere Hills volcano (1996 to 1998) was frequently accompanied by repetitive cycles of earthquakes, ground deformation, degassing, and explosive eruptions. The cycles reflected unsteady conduit flow of volatile-charged magma resulting from gas exsolution, rheological stiffening, and pressurization. The cycles, over hours to days, initiated when degassed stiff magma retarde...
A Novel and Inexpensive Method for Measuring Volcanic Plume Water Fluxes at High Temporal Resolution
Water vapour (H2O) is the dominant species in volcanic gas plumes. Therefore, measurements of H2O fluxes could provide valuable constraints on subsurface degassing and magmatic processes. However, due to the large and variable concentration of this species in the background atmosphere, little attention has been devoted to monitoring the emission rates of this species from volcanoes. Instead, th...
15 16 The degassing of magmatic volatiles during eruptions beneath ice sheets and glaciers, 17 as recorded by the dissolved volatile content quenched in volcanic rocks, could 18 provide powerful new constraints on former ice thicknesses in volcanic areas. As 19 volcanic rocks are readily dateable using radiometric methods, subglacial volcanoes 20 may therefore provide crucial information on the...
By analyzing the type and content of gas in oil, latent faults equipment can be found as soon possible, monitored at any time. In this paper, a degassing device based on headspace method is designed. The oil circuit adopts way pump battery valve to complete inlet discharge. Through stirring, dissolved reach dynamic balance gas-liquid two-phase, so realize rapid effective separation oil. At same...
abstract in this study, we synthesized a novel template polymer by using methacrylic acid (mma) as functional monomer, ethylene glycol dimethacrylate(egdma) as cross linker, 2,2-azobisisobutyronitrile (aibn) as initiator and olanzapine as targeted molecule in the presence of chloroform and acetonitrile as solvent. the products have been characterized and confirmed by (chn)elemental analysis,...
We highlight a potentially important trigger for bubble growth and degassing in volcanic bombs. We have successfully triggered bubble growth in previously unvesiculated samples of silicate melt during experiments to simulate volcanic bomb impact, by firing pellets at, and dropping weights onto, melt samples. We call suggest the term ‘impact vesiculation’ to denote this phenomenon, in the labora...
he undergrounding of energy transmission cables is widely recognized as a good means to provide reliable supplies of power at a low total cost [1], [2]. As utilities increasingly acknowledge this and install many more high voltage (HV) and extra high voltage (EHV) cables, they will face a major challenge: namely, sourcing the increased amount of high quality power cable with the cable manufactu...
Eruptive activity at Turrialba Volcano (Costa Rica) has escalated significantly since 2014, causing airport and school closures in the capital city of San José. Whether or not new magma is involved in the current unrest seems probable but remains a matter of debate as ash deposits are dominated by hydrothermal material. Here we use high-frequency gas monitoring to track the behavior of the volc...
In order to assess the effect of eruption rate on the surface morphology and degassing mechanisms of silicic lava flows, we studied surface characteristics and obtained water content and hydrogen isotopic values of samples from flows at the Mount St. Helens and Santiaguito lava domes. We compared the surface textures and inferred degassing processes to short-term extrusion rates and found that ...
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