Search results for "RAV"
showing 10 items of 5866 documents
Forza gravitazionale e forza elettrostatica: storia e confronto
2013
In questo articolo viene proposta un’attività didattica riguardante il confronto tra la forza gravitazionale, ovvero la legge di gravitazione universale di Newton, e la forza elettrostatica, ovvero l’interazione tra due cariche puntiformi scoperta da Charles Coulomb. Inizialmente si introduce uno schema di progettazione didattica, rivolta a studenti del quinto anno di un liceo scientifico, basato su metodologie didattiche standard. Successivamente gli argomenti della proposta vengono trattati in dettaglio, riassumendo i passaggi storici essenziali. Infine, un confronto su scala microscopica e macroscopica dei due tipi di forze è presentato, mettendo in luce analogie e differenze utili ai fi…
Factors affecting short- and long-term survival of patients with acute coronary syndrome treated invasively using intravascular ultrasound and fracti…
2023
Background: Intravascular ultrasound (IVUS) and fractional flow reserve (FFR) are invasive procedures increasingly used in acute coronary syndrome (ACS). Aims: The aim of this study was to evaluate the prevalence of IVUS and FFR use in patients with ACS in Poland and to assess the safety of these procedures, as well as their impact on short- and long-term survival. Methods and results: The retrospective study included 103849 patients enrolled in the PL-ACS registry in 2017-2020. IVUS was performed in 1,727 patients, FFR in 1,537 patients, both procedures in 37 patients. The frequency of performing FFR in ACS over the years increased from 1.3% to 1.8% (p <0.0001) and IVUS from 1.7% to 2.3% (…
Lowered nutritional quality of prey decrease the growth and biomolecule content of rainbow trout fry
2022
Diet quality is crucial for the development of offspring. Here, we examined how the nutritional quality of prey affects somatic growth and the lipid, carbohydrate, protein, amino acid, and polyunsaturated fatty acid content of rainbow trout (Oncorhynchus mykiss) fry using a three-trophic-level experimental setup. Diets differed especially in their content of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), which are physiologically essential polyunsaturated fatty acids for a fish fry. Trout were fed with an artificial diet (fish feed, DHA-rich), marine zooplankton diet (krill/Mysis, DHA-rich), or freshwater zooplankton diet (Daphnia, Cladocera, DHA-deficient). The Daphnia were gr…
Eutrophication reduces the nutritional value of phytoplankton in boreal lakes
2019
Eutrophication (as an increase in total phosphorus [TP]) increases harmful algal blooms and reduces the proportion of high-quality phytoplankton in seston and the content of ω-3 long-chain polyunsaturated fatty acids (eicosapentaenoic acid [EPA] and docosahexaenoic acid [DHA]) in fish. However, it is not well-known how eutrophication affects the overall nutritional value of phytoplankton. Therefore, we studied the impact of eutrophication on the production (as concentration; μg L−1) and content (μg mg C−1) of amino acids, EPA, DHA, and sterols, i.e., the nutritional value of phytoplankton in 107 boreal lakes. The lakes were categorized in seven TP concentration categories ranging from ultra…
Interannual variation in littoral benthic macroinvertebrate communities under contrasting crayfish predation in a large boreal lake
2014
Long term studies are widely used nowadays in many fields of ecology. For instance, records over years represent a valuable tool to monitor and comprehend environmental changes. In freshwater ecology, long term studies are often applied in restoration effect assessments using a before-after-control-impact design. Little is known about the long term effects of freshwater predators on their prey, for example of how crayfish as omnivorous predators affect macroinvertebrate prey communities. Bottom substrate of stony littoral shores in three sites of Lake Päijänne, in Central Finland, were sampled for macroinvertebrates (MI) during five consecutive years and identified mainly to species. Of the…
Demo 6. Caída de cuerpos en ausencia de aire
2013
Objetivo: Demostrar que, en ausencia de aire (vacío parcial de aire), el tiempo de caída de los cuerpos es independiente de su masa o forma.
The necropolis of Ensisheim/Reguisheimerfeld (Haut-Rhin) : illustration of the Late Bronze Age funerary practices in Alsace
2007
In 2000, the preventive excavation of the Ensisheim/Reguisheimerfeld site (Haut-Rhin), carried out by the ANTEA SARL company, brought to light 87 funerary structures belonging to a cremation necropolis dating from the beginning of the Late Bronze Age (around 1350-1050 BC). Following study of the material, 3 successive chronological phases and a possible cultural "faciès" centred on the bend in the Rhine at Basel, Switzerland, were distinguished. The archaeo-anthropological study of the burnt bones revealed, among other things, the existence of a large number of multiple graves and of socially immature members of the society, phenomena rarely observed in the region. The analysis of the inter…
Hiihdon lajianalyysi ja valmennuksen ohjelmointi
2011
Tämän työn tarkoituksena on keskittyä maastohiihdon kehityksen mukanaan tuomiin muutoksiin harjoittelussa ja kilpailemisessa. Työssä tuodaan esille yleiskuva suomalaisen maastohiihdon tilanteesta sekä nuoren urheilijan harjoittelusta ja mahdollisuuksista nousta maailman huipulle. Biomekaaninen lajianalyysi. Kilpailuissa maailman huipulla hiihtotekniikoiden merkitys on erittäin suuri, sillä fyysisissä ominaisuuksissa erot ovat pieniä. Usein kilpailun voi ratkaista taktiikka, välineet tai tekninen osaaminen. Nykypäivänä jopa loivat ylämäet edetään tasatyönnöllä, ja sen merkitys hiihdossa onkin korostunut viime vuosina. Luisteluhiihdossa taas wassberg on vallitseva tekniikka. Nämä tyylien muut…
Suomalaisten nuorten miesten ravinto- ja liikuntatottumusten yhteys kehon koostumukseen ja fyysiseen kuntoon
2009
Elintapojen on osoitettu olevan suurimpia terveysongelmien aiheuttajia (Nyholm ym. 2004). Fyysinen aktiivisuus on käänteisesti yhteydessä muun muassa sydän- ja verisuonitautien sekä aikuistyypin diabeteksen esiintyvyyteen (Shephard 2001) ja hyvä fyysinen kunto puolestaan pienentää kuolleisuutta vielä fyysistä aktiivisuuttakin enemmän (Blair ym. 2001). Ravintotottumusten terveellisyys taas näyttäisi takaavan suuremmat mahdollisuudet normaalipainoon (Lahti-Koski ym. 2002). Vuosien 1975 - 2004 välillä suomalaisten nuorten miesten kehon massan on kuitenkin havaittu nousseen ja kestävyyden- ja lihaskunnon samalla laskeneen (Santtila ym. 2006). Koska säännöllinen liikunta, hyvä fyysinen kunto ja …
Le fou de cour ou le miroir du prince. Le personnage du fou à la cour de Bourgogne à la fin du Moyen Age
2003
dir. Anne-Marie Cocula et Michel Combet; International audience