Search results for "O2"
showing 10 items of 1115 documents
Impact of Cardiorespiratory Fitness on Survival in Men with Low Socioeconomic Status
2020
Abstract Aims Although both low socioeconomic status (SES) and poor cardiorespiratory fitness (CRF) are associated with increased chronic disease and heightened mortality, it remains unclear whether moderate-to-high levels of CRF are associated with survival benefits in low SES populations. This study evaluated the hypothesis that SES and CRF predict all-cause mortality and cardiovascular disease mortality and that moderate-to-high levels of CRF may attenuate the association between low SES and increased mortality. Methods This study included 2368 men, who were followed in the Kuopio Ischaemic Heart Disease Study cohort. CRF was directly measured by peak oxygen uptake during progressive exe…
Extraction of lapachol from Tabebuia avellanedae wood with supercritical CO2: an alternative to Soxhlet extraction?
2003
The solubility of lapachol in supercritical CO2 was determined at 40°C and pressures between 90 and 210 bar. Supercritical fluid extraction of lapachol and some related compounds by CO2 from Tabebuia avellanedae wood is compared to Soxhlet extraction with different solvents. A standard macroscale (100-200 g wood) and a microscale (~10 mg wood) experimental setup are described and their results are compared. The latter involved direct spectrophotometric quantification in a high-pressure autoclave with an integrated optical path and a magnetic stirrer, fitted directly into a commercial spectrophotometer. The relative amount of lapachol extracted by supercritical CO2 at 40°C and 200 bar was ab…
Oxidation of silicon nanoparticles produced by ns laser ablation in liquids
2014
The investigation of nanoparticles produced by ns pulsed Nd:YAG laser ablation of silicon in liquids is reported. Combined characterization by morphological and structural techniques shows that these nanoparticles have a mean diameter of ~3 nm and a core-shell structure consisting of a Si-nanocrystal surrounded by a layer of oxidized Si. Time resolved luminescence spectra evidence visible and UV emissions: a broad band around 1.9 eV originates from Si-nanocrystals, while two bands centered at 2.7 eV and 4.4 eV are associated with oxygen deficient centers in the SiO2 shell.
Elevated CO2 emissions during magmatic-hydrothermal degassing at Awu Volcano, Sangihe Arc, Indonesia
2020
Awu is a remote and little known active volcano of Indonesia located in the northern part of Molucca Sea. It is the northernmost active volcano of the Sangihe arc with 18 eruptions in less than 4 centuries, causing a cumulative death toll of 11,048. Two of these eruptions were classified with a Volcanic Explosivity Index (VEI) of 4. Since 2004, a lava dome has occupied the centre of Awu crater, channelling the fumarolic gas output along the crater wall. A combined Differential Optical Absorption Spectroscopy (DOAS) and Multi-component Gas Analyzer System (Multi-GAS) study highlight a relatively small SO2 flux (13 t/d) sustained by mixed magmatic&ndash
Tunable diode laser measurements of hydrothermal/volcanic CO2 and implications for the global CO2 budget
2014
Quantifying the CO2 flux sustained by low-temperature fumarolic fields in hydrothermal/volcanic environments has remained a challenge, to date. Here, we explored the potential of a commercial infrared tunable laser unit for quantifying such fumarolic volcanic/hydrothermal CO2 fluxes. Our field tests were conducted between April 2013 and March 2014 at Nea Kameni (Santorini, Greece), Hekla and Krýsuvík (Iceland) and Vulcano (Aeolian Islands, Italy). At these sites, the tunable laser was used to measure the path-integrated CO2 mixing ratios along cross sections of the fumaroles' atmospheric plumes. By using a tomographic post-processing routine, we then obtained, for each manifestation, the co…
Carbon emissions by Ssouth american companies: driving factors for reporting decisions and emissions reduction
2018
In the last decade, companies have started to disclose information on carbon emissions. To our knowledge, this is the first paper to look into this phenomenon in South America, which is a very important geographical area regarding climate change because of the local nature and developing economies. This paper explores the relationships between some corporate variables and two important decisions: (i) whether to report carbon emissions, and (ii) the impact on the evolution of carbon emissions. Logit and linear panel data models are used to determine the driving factors for decisions (i) and (ii). Our results show that regarding the carbon reporting decision, a company&rsquo
Yhdistetty kestävyys- ja voimaharjoittelu : erityisesti harjoitusjärjestyksen vaikutus fyysiseen suorituskykyyn ja hormonipitoisuuksiin
2013
Johdanto. Monet kuntoilijat ja urheilijat käyttävät harjoittelussaan sekä kestävyys- että voimaharjoittelua. Tässä tutkimuksessa tutkittiin saman harjoituksen aikana toteutettujen kestävyys- ja voimaharjoitusosioiden järjestyksen vaikutusta maksimaaliseen hapenottokykyyn (VO2max:iin), maksimivoimaan sekä hormonien lepopitoisuuksiin. Menetelmät. Tähän tutkimukseen osallistui 42 aiemmin vähän harjoitellutta miestä. Tutkimuksessa loppuun asti mukana oli kuitenkin 30 koehenkilöä, jotka oli jaettu kahteen ryhmään. Ryhmä E+S (n=14, ikä 28,7 ± 5,5 vuotta) harjoitteli harjoituksissa ensin kestävyysosion (E) ja 10 minuutin tauon jälkeen voimaosion (S). Ryhmä S+E (n=16, ikä 29,8 ± 4,7 vuotta) harjoit…
Peak oxygen uptake cut-points to identify children at increased cardiometabolic risk - The PANIC Study.
2019
We aimed to develop cut -points for directly measured peak oxygen uptake (VO2peak ) to identify boys and girls at increased cardiometabolic risk using different scaling methods to control for body size and composition. Altogether 352 children (186 boys, 166 girls) aged 9 – 11 years were included in the analyses. We measured VO2peak directly during a maximal cycle ergometer exercise test and lean body mass (LM) by bioelectrical impedance. We computed a sex - and age -specific cardiometabolic risk score (CRS) by summing important cardiometabolic risk factors and defined increased cardiometabolic risk as >1 standard deviation above the mean of CRS. Receiver operating characteristics curves wer…
Etäteknologiaa sisältävien liikunnallisten kuntoutusinterventioiden vaikuttavuus maksimaaliseen hapenottokykyyn : järjestelmällinen kirjallisuuskatsa…
2017
Hengitys- ja verenkiertoelimistön kunnon on todettu olevan yhteydessä useisiin sairauksiin ja eliniänodotteeseen. Etäteknologiaa sisältävillä interventioilla on todettu olevan yhteys fyysiseen aktiivisuuteen ja hengitys- ja verenkiertoelimistön kuntoon, mutta tutkittua vaikuttavuustietoa on vähän. Maksimaalinen hapenottokyky on yleisesti käytetty hengitys- ja verenkiertoelimistön kunnon mittari, ja se kuvaa hengitys- ja verenkiertoelimistön kykyä kuljettaa happea lihaksille. Tämän järjestelmällisen kirjallisuuskatsauksen tavoitteena oli selvittää etäteknologiaa sisältävien liikunnallisten kuntoutusinterventioiden vaikuttavuutta maksimaaliseen hapenottokykyyn. Kirjallisuushaku tehtiin (2000–…
The relationship between vigilance capacity and physical exercise: a mixed-effects multistudy analysis
2019
We thank to all the participants who took part in the experiment.