Search results for "O2"
showing 10 items of 1115 documents
Degradation of 4-nitrophenol (4-NP) using Fe-TiO2 as a heterogeneous photo-Fenton catalyst
2010
HIT-harjoittelun vaikutukset VO2max:iin, kehon koostumukseen ja voimaan 6 viikon harjoitusjaksolla
2017
HIT–harjoittelua (korkeatehoista intervalliharjoittelua) on käytetty kilpaurheilussa jo pitkään suorituskyvyn ja erityisesti maksimaalisen hapenottokyvyn parantamiseksi. Nykyään harjoitusmenetelmää käyttävät myös tavalliset kuntoilijat, sillä HIT-harjoitukset ovat tehokkaita ja nopeita toteuttaa. HIT-harjoittelua on viime aikoina alettu käyttää myös voimaharjoittelussa kehonpainoa tai erilaisia painoja hyödyntäen. Tämän tutkimuksen tarkoituksena oli selvittää kahden erilaisen HIT-kuormitusmallin (HIT 1: 4*4 min 85%/2 min ja HIT 2: 10*1 min 95%/1½min) vaikutuksia hapenottokykyyn, voimaan ja kehon koostumukseen. Tutkimukseen osallistui 33 (keski-ikä 47.6 ± 5.4 vuotta) työssäkäyvää henkilöä. H…
Analysis of high excited "hot" bands of the SO2 molecule
2011
The main goal of the present study is to analyse rotational structures of highly excited "hot" vibrational bands, v1+2v2-v2 and 2v2+v3-v2, v2+3v3-v2 and 2v1+v2+v3-v2, and v2+2v3-v2. All of these bands are located in the region of considerably stronger bands, v1 + v2 and v2 + v3, 3v3 and 2v1+v3, and 2v3, respectively . On that reason, as the first step of analysis, we made assignments of transitions belonging to these strong bands. As the result of analysis, we were able to assign three times more transitions to the bands v1 + v2 , v2 + v3, and 3v3 (3360 transitions with Jmax. = 78 and Kmax.a = 27 to the band v1 + v2, and 2380 transitions with Jmax. = 69 and Kmax.a = 24 to the band v2 + v3, …
Skābekļa rezerves indeksa mērījumu izmaiņas dinamikā un praktiskā nozīme vispārējās anestēzijas laikā muguras ortopēdiskajās operācijās
2022
Pētījuma aktualitāte: Skābekļa rezerves indekss (ORI) ir jauns, nepārtraukts, neinvazīvs un reāllaika parametrs, lai novērtētu PaO2 līmeni diapazonā no 100 līdz 200 mmHg. ORI var sniegt agrīnu brīdinājumu, pirms skābekļa piesātinājums sāk samazināties, un paplašina iespēju neinvazīvi un nepārtraukti uzraudzīt cilvēka ķermeņa skābekļa piegādes stāvokli, lai izvairītos no nevajadzīgas hiperoksijas vai neparedzētas hipoksijas. Paaugstināts ĶMI (ķermeņa masas indekss) ir saistīts ar grūtībām ventilēt pacientu un nodrošināt pietiekamu skābekļa daudzumu. ORI var tikt izmantots, lai sniegtu ieskatu ventilējamo pacientu skābekļa rezervēs. Mērķis: Izvērtēt ORI (skābekļa rezerves indeksa) mērījumu iz…
Electrochemical conversion of CO2 to formic acid using a Sn based cathode: Combined effect of temperature and pressure
2023
Electrochemical conversion of CO2 in the aqueous electrolyte into value-added chemicals is considered one of the most promising strategies to valorize waste-CO2. In the last decade, high attention was focused on the electro- chemical synthesis of formic acid (FA) via CO2 reduction using Sn cathodes. To improve the final concentration of FA in aqueous electrolytes, several approaches, including the utilization of different technologies (i.e. pressurized CO2 reactor, a gas diffusion electrode, divided cell etc...) and different operative conditions (i.e. pH, current densities, temperature, mixing rate, etc...) were investigated in detail. To date, the effect of temperature (T) on the electroc…
High Resolution Study of the v1 + 2v2 −v2 and 2v2 + v3 − v2 ”Hot” Bands and Ro-Vibrational Re-Analysis of the v1 + v2/v2 + v3/3v3 Poliad of the SO2 M…
2010
The main goal of the present study was to analyse rotational stuctures of two excited vibrational states, (120) and (021). Because both the band, v1+2v2 and 2v2+v3 one are extremally weak, a special efforts were faired to record very weak hot bands, v1+2v2−v2 and 2v2+v3−v2.Both of those bands are located in the region of considerably more stronger combinational bands, v1 + v2 and v2 + v3. On that reason, as the first step of analysis, we made assignments of transitions belonging to these v1 + v2 and v2 + v3 bands. As the result of analysis, we were able to assign three times more transitions to the bands v1 + v2 and v2 + v3 than it was known in the before literature. After "cleaning" the ex…
Ocean acidification and elevated temperature negatively affect recruitment, oxygen consumption and calcification of the reef-building Dendropoma cris…
2019
Expected temperature rise and seawater pH decrease may affect marine organism fitness. By a transplant experiment involving air-temperature manipulation along a natural CO2 gradient, we investigated the effects of high pCO(2) (similar to 1100 mu atm) and elevated temperature (up to +2 degrees C than ambient conditions) on the reproductive success, recruitment, growth, shell chemical composition and oxygen consumption of the early life stages of the intertidal reef-building vermetid Dendropoma cristatum. Reproductive success was predominantly affected by temperature increase, with encapsulated embryos exhibiting higher survival in control than elevated temperature conditions, which were in t…
Investigation on the ganaration process of HO2• radicals by γ-ray irradiation in O2-loaded fumed silica
2013
Abstract We report an experimental investigation on the effects of γ-ray irradiation in three types of fumed silica previously loaded with O 2 molecules. Our data indicate that the main effect of irradiation in these systems is to generate a very large concentration of HO 2 interstitial radicals (about 10 18 molecules/cm 3 ). Furthermore, the number of generated HO 2 was found to be larger in the samples with higher O 2 contents before irradiation. This correlation suggests that HO 2 radicals are induced by reaction of interstitial O 2 molecules with radiolytic H atoms, as previously suggested for O 2 -loaded bulk amorphous silicon dioxide (a-SiO 2 or silica) samples. However, at variance …
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…
CO2 output discharged from Stromboli Island (Italy)
2013
Abstract Total CO 2 output from soil gas and plume, discharged from the Stromboli Island, was estimated. The CO 2 emission of the plume emitted from the active crater was estimated on the basis of the SO 2 crater output and C/S ratio, while CO 2 discharged through diffuse soil emission was quantified on the basis of 419 measurements of CO 2 fluxes from the soil of the whole island, performed by using the accumulation chamber method. The results indicate an overall output of ≅ 416 t day − 1 of CO 2 from the island. The main contribution to the total CO 2 output comes from the summit area (396 t day − 1 ), with 370 t/day from the active crater and 26 t day − 1 from the Pizzo sopra La Fossa so…