Search results for "RAV"
showing 10 items of 5866 documents
Heikko ravintotilanne rajoittaa hauen (Esox lucius) ja kuhan (Sander lucioperca) kasvua Suotajärvessä
2014
Hauki ja kuha esiintyvät Suomessa usein samoissa vesistöissä, mutta niiden vuorovaikutuksesta tiedetään vain vähän. Mikäli lajit kilpailevat samoista resursseista, runsaat kuhaistutukset tai kuhan luonnollinen yleistyminen voivat vaikuttaa negatiivisesti hauen menestykseen. Tämän tutkimuksen tarkoitus oli selvittää hauen ja kuhan kasvua ja ravinnonkäyttöä Suotajärvessä. Kasvua tarkasteltiin myös suhteessa kasvukausien lämpötilaan. Ravinnonkäytössä keskityttiin hauen ja kuhan ravinnon päällekkäisyyteen ja siitä mahdollisesti seuraavaan ravintokilpailuun. Lisäksi verkkokoekalastuksilla selvitettiin järven kalaston yleistä tilaa, erityisesti ajatellen petokalojen ravintotilannetta. Hauki- ja k…
Zvaigžņotā Debess: 2012, Vasara (216)
2012
Contents: “ZVAIGŽŅOTĀ DEBESS” FORTY YEARS AGO: E.Bervalds. From Intention to Reality (abridged) ; A.Egle. Conceptions of Our Ancestry About Heavenly Bodies and Astronomical Phenomena (abridged) ; NEWS: I.Eglītis. Asteroid Discovered at Baldone Observatory Named after Ikaunieks ; A.Alksnis. ALMA Helps to Study Planetary System of Star Fomalhaut ; A.Alksnis. More than Ten Light-Years Long Filament of Cosmic Dust Discovered ; A.Alksnis. Billions of Rocky Planets in the Milky Way ; SPACE RESEARCH and EXPLORATION: M.Sudārs. The Little Secret Space Shuttle Is Flying! ; M.Sudārs. Too Much Litter! Not in Rubbish Dump, but in the Space! ; “ENERĢIJA un PASAULE” VISITS “ZVAIGŽŅOTĀ DEBESS”: Talk with D…
Liquid chromatographic determination of toxigenic secondary metabolites produced by Fusarium strains.
2002
Various liquid chromatographic methods used in the analysis of mycotoxins (zearalenone, trichothecenes and fumonisins) produced by Fusarium species were compared in this work. The results demonstrate the suitability of modern clean-up procedures employing multifunctional MycoSep and immunoaffinity columns although these methods are more expensive than conventional methodologies for clean-up. HPLC with both fluorescence and photodiode array detection is a suitable technique for the analysis of toxic secondary metabolites produced by Fusarium species; different derivatisation strategies have been studied to improve the sensitivity of the technique because of the low concentration of these met…
Core (XUV/VUV) and boundary (UV/vis/IR) plasma spectroscopy in fusion devices
2021
This contribution describes the basic applications of passive optical emission spectroscopy in the visible and far-UV region of electromagnetic radiation to diagnostics of the magnetic confinement fusion plasma. To simplify and condense the broad topic it presents the most common ways of analyzing the spectra of atoms, ions and molecules in fusion plasma and disseminating results of those analysis to the non-spectroscopists. It provides the reasons for choosing some particular regions, elements and charge states to determine the impurity content and plasma-surface interactions in MCF (Magnetic Confinement Fusion) reactor. Examples used in the contribution are predominantly from measurements…
« Regards sur l’histoire politique de la Fédération sportive et gymnique du travail face à l’immigration coloniale et européenne (1920-1970) »
2008
Coronal properties of G-type stars in different evolutionary phases
2005
We report on the analysis of XMM-Newton observations of three G-type stars in very different evolutionary phases: the weak-lined T Tauri star HD 283572, the Zero Age Main Sequence star EK Dra and the Hertzsprung-gap giant star 31 Com. They all have high X-ray luminosity (10^31 erg/s for HD 283572 and 31 Com and 10^30 erg/s for EK Dra). We compare the Emission Measure Distributions (EMDs) of these active coronal sources, derived from high-resolution XMM-Newton grating spectra, as well as the pattern of elemental abundances vs. First Ionization Potential (FIP). We also perform time-resolved spectroscopy of a flare detected by XMM from EK Dra. We interpret the observed $EMD$s as the result of …
Dwie drogi ze Wschodu na Zachód. Szkic biograficzny do historii polskich losów XIX i XX wieku
2020
The article was inspired by the biography of Zofia Kossak-Szczucka. The rich life of Zofia Kossak was full of extraordinary situations and twists and turns, but above all, her life was characterized by a constant journey. The road from one end of Europe – Ukraine, to the other – the British Isles. Her story became a pretext for presenting the path that two other Poles traveled from the eastern ends of Europe towards its heart and western borders. The first of them was known, although widely, but only from one chapter of the biography – Gabriel Narutowicz. An extremely interesting figure, who came to Switzerland from Lithuania for health reasons in the mid-1880s. He has found his new home in…
Positronium as a probe in natural polymers: decomposition in starch
2009
Ortho-positronium (o-Ps) is used as a probe in positron annihilation lifetime spectroscopy (PALS) experiments, to characterise the behaviour of free volumes in natural starch samples, as a function of temperature (T). Up to about 540 K, the o-Ps intensity, I(3), remains constant at 26.2% while its lifetime, tau(3), is found to increase linearly. Both parameters undergo a decrease above this T, due to the onset of decomposition, which results in a shrinking of the sample pellets. The results indicate that the glass transition temperature should be above 501 K. Data from thermal gravimetry analysis (TGA) measurements are well described by supposing a first order process for the survival proba…
Grafēna/metāla oksīda kompozīta kārtiņu elektroforētiska uzklāšana un fizikāli ķīmiskās īpašības
2015
Grafēna/metāla oksīda kompozīta kārtiņu elektroforētiska uzklāšana un fizikāli ķīmiskās īpašības. Dorondo A., zinātniskais vadītājs Dr. ķīm. Bajārs G. Maģistra darbs 46 lappuses, 18 attēli, 3 tabulas, 62 literatūras avoti, 1 pielikums. Latviešu valodā. Darbā ir veikta elektroforētiska grafēna/metāla oksīda kompozīta kārtiņu uzklāšana uz tērauda elektroda potenciostatiskā režīmā, galvenokārt, no ūdens un izopropanola suspensijām. Iegūtās kārtiņas tika analizētas, izmantojot skenējošo elektronu mikroskopiju, Raman spektrometriju un XRD. Noteikta kārtiņu gravimetriskā lādiņietilpība - CFO/G/I kārtiņa uzrāda augstāku gravimetrisko lādiņietilpību nekā CFO/G/H kārtiņa. GRAFĒNA UN METĀLU OKSĪDU KO…