Search results for "O2"
showing 10 items of 1115 documents
Influence of Nitrogen Doping on Device Operation for TiO₂-Based Solid-State Dye-Sensitized Solar Cells: Photo-Physics from Materials to Devices.
2015
Solid-state dye-sensitized solar cells (ssDSSC) constitute a major approach to photovoltaic energy conversion with efficiencies over 8% reported thanks to the rational design of efficient porous metal oxide electrodes, organic chromophores, and hole transporters. Among the various strategies used to push the performance ahead, doping of the nanocrystalline titanium dioxide (TiO2) electrode is regularly proposed to extend the photo-activity of the materials into the visible range. However, although various beneficial effects for device performance have been observed in the literature, they remain strongly dependent on the method used for the production of the metal oxide, and the influence o…
Management of Early Glottic Cancer Treated by CO2 Laser According to Surgical-Margin Status: A Systematic Review of the Literature
2021
Abstract Introduction Transoral laser microsurgery (TLM) is the treatment of choice for Tis-T2 squamous cell glottic carcinomas due to its advantages compared with open surgery and radiotherapy. However, the CO2 laser beam causes changes and damage on the specimens, making the histological assessment of resection margins, the gold standard for confirming radical tumor resection, sometimes difficult. Objective To assess the different ways to manage patients depending on the status of the histopathological margin according to recent studies to detect the most commonly shared therapeutic strategy. Data Synthesis We analyzed the literature available on the PubMed and Web of Science databases, i…
First observational evidence for the CO2-driven origin of Stromboli’s major explosions
2011
Effects of Repeated Sprint Training in Hypoxia on Physical Performance Among Athletes : A Systematic Review
2021
Repeated sprint training in hypoxia (RSH) represents an innovative method in the process of development and improvement of physical performance among athletes. However, there is less scientific data on this topic. The purpose of this systematic review was to investigate the effect of RSH method on motor abilities and performance among athletes, obtain new information, and expand the already known conclusions. The data search was performed of 4 electronic databases for the years 2000-2021 May as follows: Google Scholar, PubMed, Web of Science, and ResearchGate. This search with English language restriction was made by using the following terms, individually/combination: "repeated sprint abil…
Nutritional intake and anthropometric characteristics are associated with endurance performance and markers of low energy availability in young femal…
2023
Background Low energy availability (LEA) can have negative performance consequences, but the relationships between LEA and performance are poorly understood especially in field conditions. In addition, little is known about the contribution of macronutrients to long-term performance. Therefore, the aim of this study was to evaluate if energy availability (EA) and macronutrient intake in a field-based situation were associated with laboratory-measured performance, anthropometric characteristics, blood markers, training volume, and/or questionnaire-assessed risk of LEA in young female cross-country (XC) skiers. In addition, the study aimed to clarify which factors explained performance. Metho…
Harjoittelun vaikutus palautumiseen maksimaalisesta hapenottokyvyn testistä ja palautumisen yhteys harjoitusvasteeseen
2012
Tutkimuksen tarkoituksena oli selvittää kuinka kuntotasoltaan erilaiset varusmiehet palautuvat maksimaalisesta hapenottokyvyn (VO2max) testistä, onko palautuminen yhteydessä harjoitusvasteeseen ja kuinka fyysisesti kuormittavaa peruskoulutuskausi varusmiehille on. Palautumisen, harjoitusvasteen ja harjoituskuorman yhteyksiä toisiin-sa mitattiin syke- ja hengityskaasumuuttujia käyttäen. Koehenkilöinä oli 59 varusmiestä (ikä19.6 ± 0.3 v). VO2max mitattiin viikoilla 1, 5, 8 ja 10 ja varusmiehet jaettiin kol-meen kuntoluokkaan viikolla yksi mitatun VO2max:n perusteella (>45 ml/kg/min aktii-vi; 40–44.9 ml/kg/min harraste ja <39.9 ml/kg/min perus). Harjoituskuorma TRIMP laskettiin sydämen sykkeen…
Performance-related physiological changes induced by one year of endurance training in young athletes
2023
IntroductionAlthough maximal oxygen uptake (VO2max) is generally recognized as the single best indicator of aerobic fitness in youth, interpretation of this parameter and the extent to which it can be improved by training remain controversial, as does the relative importance of VO2max for performance in comparison to other factors such as power production. Here, we examined the influence of endurance training on the VO2max, muscle power and sports-related performance of cross-country skiers attending a school specializing in sports, as well as potential relationships between any changes observed to one another and/or to perceived stress scale (Cohen) and certain blood parameters.MethodsOn t…
Composite Membranes of Sulfonated Poly(ether ether ketone) with Active Carbon: Composite Preparation and Investigation of their Properties for Potent…
2020
Authors of this work acknowledge funding from European Union`s Horizon 2020 Research and Innovation Program project under grant agreement No 768789.
Limits to CO2-Neutrality of Burning Wood. (Review)
2016
Abstract Consumption of wood as a source of energy is discussed with respect to efficiency and restraints to ensure sustainability of the environment on the grounds of a simple analytical model describing dynamics of biomass accumulation in forest stands – a particular case of the well-known empirical Richards’ equation. Amounts of wood harvested under conditions of maximum productivity of forest land are presented in units normalised with respect to the maximum of the mean annual increment and used to determine the limits of CO2-neutrality. The ecological “footprint” defined by the area of growing stands necessary to absorb the excess amount of CO2 annually released from burning biomass is…
Sykevälivaihtelu ja sen yhteys kestävyyssuorituskyvyn kehitykseen yhdistetyn kestävyys- ja voimaharjoitusjakson aikana
2015
Tämän tutkimuksen tarkoituksena oli tutkia yhdistetyn kestävyys- ja voimaharjoitusjakson aikaisen sykevälivaihtelun yhteyttä kestävyyssuorituskyvyn kehitykseen. Lisäksi tarkoituksena oli vertailla kestävyys- sekä voimaharjoituksen jälkeistä sykevälivaihtelua ja tutkia sykevälivaihtelussa tapahtuvia muutoksia harjoitusjakson edetessä. Tutkielma oli osa laajempaa liikuntabiologian laitoksen tutkimusta yhdistetystä kestävyys- ja voimaharjoittelusta. Sykevälivaihtelumittauksiin osallistuneita tutkittavia oli kaikkiaan 9, joista 7 oli naisia ja 2 miehiä. Tutkittavat olivat iältään 30.8 ± 4.8 vuotta ja heidän lähtötason VO2max oli 44.8 ± 5.0. Kymmenen viikon harjoitusjakson aikana tutkittavien vi…