Search results for "mars"
showing 10 items of 384 documents
Optimal slope units partitioning in landslide susceptibility mapping
2020
In landslide susceptibility modeling, the selection of the mapping units is a very relevant topic both in terms of geomorphological adequacy and suitability of the models and final maps. In this paper, a test to integrate pixels and slope units is presented. MARS (Multivariate Adaptive Regression Splines) modeling was applied to assess landslide susceptibility based on a 12 predictors and a 1608 cases database. A pixel-based model was prepared and the scores zoned into 10 different types of slope units, obtained by differently combining two half-basin (HB) and four landform classification (LCL) coverages. The predictive performance of the 10 models were then compared to select the best perf…
Zvaigžņotā Debess: 2011, Pavasaris (211)
2011
Contents: “ZVAIGŽŅOTĀ DEBESS” FORTY YEARS AGO: A.Alksnis. XIV General Assembly of the International Astronomical Union (abridged) ; H.Strods. Jaunlaicene’s Watchmaker (abridged) ; I.Daube. At the Radioastrophysical Observatory of the Latvian Academy of Sciences (abridged). 50 YEARS SINCE GAGARIN’S SPACE FLIGHT: R.Misa. Dream about Cosmos ; A.Zalcmane. Konstantin Tsiolkovsky Astronautics Museum in Kaluga; E.Bērziņa. Outer Space in Pauls Stradins Museum of History of Medicine. NEWS: A.Alksnis. Different Faces of Whirpool Galaxy ; A.Alksnis. The Kleopatra’s Trio and other Minor Planets Groups. SPACE RESEARCH and EXPLORATION: V.Kalniņš. NASA Preparing Solar Probe Plus to Plunge into Sun's Atmos…
Basaltic Rocks Analyzed by the Spirit Rover in Gusev Crater
2004
The Spirit landing site in Gusev Crater on Mars contains dark, fine-grained, vesicular rocks interpreted as lavas. Pancam and MiniâThermal Emission Spectrometer (Mini-TES) spectra suggest that all of these rocks are similar but have variable coatings and dust mantles. Magnified images of brushed and abraded rock surfaces show alteration rinds and veins. Rock interiors contain â¤25% megacrysts. Chemical analyses of rocks by the Alpha Particle X-ray Spectrometer are consistent with picritic basalts, containing normative olivine, pyroxenes, plagioclase, and accessory FeTi oxides. MoÌssbauer, Pancam, and Mini-TES spectra confirm the presence of olivine, magnetite, and probably pyroxene. The…
Reconstruction of the environmental evolution of a Sicilian saltmarsh (Italy)
2013
The present study deals with the reconstruction of the environmental evolution of a Trapani saltmarsh (southwestern Sicily, Italy) by combining different analytical approaches such as metal content evaluation, low-field nuclear magnetic resonance (NMR) relaxometry, and benthic foraminifera identification. A 41 cm core was collected in the sediments of a Trapani saltmarsh (southwestern Sicily, Italy) at a water depth of about 50 cm. Different time intervals were recognized, each characterized by peculiar features that testify different environmental conditions. In particular, the bottom layers of the sediment core (41–28 cm) comprised the lowest amount of mud fraction, only some selected met…
Mineralogy at Gusev Crater from the Mössbauer spectrometer on the Spirit Rover.
2004
Mössbauer spectra measured on Mars by the Spirit rover during the primary mission are characterized by two ferrous iron doublets (olivine and probably pyroxene) and a ferric iron doublet (tentatively associated to nanophase ferric iron oxide). Two sextets resulting from nonstoichiometric magnetite are also present, except for a coating on the rock Mazatzal, where a hematite-like sextet is present. Greater proportions of ferric-bearing phases are associated with undisturbed soils and rock surfaces as compared to fresh rock surfaces exposed by grinding. The ubiquitous presence of olivine in soil suggests that physical rather than chemical weathering processes currently dominate at Gusev crat…
Magnetic Properties Experiments on the Mars Exploration Rover Spirit at Gusev Crater
2004
The magnetic properties experiments are designed to help identify the magnetic minerals in the dust and rocks on Mars—and to determine whether liquid water was involved in the formation and alteration of these magnetic minerals. Almost all of the dust particles suspended in the martian atmosphere must contain ferrimagnetic minerals (such as maghemite or magnetite) in an amount of ∼2% by weight. The most magnetic fraction of the dust appears darker than the average dust. Magnetite was detected in the first two rocks ground by Spirit.
Abiotic versus biotic iron mineral transformation studied by a miniaturized backscattering Mössbauer spectrometer (MIMOS II), X-ray diffraction and R…
2017
Abstract Searching for biomarkers or signatures of microbial transformations of minerals is a critical aspect for determining how life evolved on Earth, and whether or not life may have existed in other planets, including Mars. In order to solve such questions, several missions to Mars have sought to determine the geochemistry and mineralogy on the Martian surface. This research includes the two miniaturized Mossbauer spectrometers (MIMOS II) on board the Mars Exploration Rovers Spirit and Opportunity, which have detected a variety of iron minerals on Mars, including magnetite (Fe2+Fe3+2O4) and goethite (α-FeO(OH)). On Earth, both minerals can derive from microbiological activity (e.g. thro…
Marsupialización modificada de ránula gigante intraoral: reporte de caso
2016
ResumenLa ránula intraoral es una enfermedad benigna seudoquística de extravasación que tiene su origen en las glándulas salivales sublinguales. Es una entidad poco prevalente. Es más frecuente en niños y adolescentes, con características clínicas propias que la diferencian de otras entidades de la boca.Su tratamiento es quirúrgico y varias técnicas han sido descritas en la literatura: marsupialización simple y modificada, enucleación de la lesión, extirpación de la glándula junto con enucleación de la ránula.Si bien la extirpación de la glándula junto con la enucleación de la lesión es el tratamiento definitivo radical y más aceptado, la marsupialización modificada puede ser útil como alte…
Charakter publikacji ks. prałata Carla Ulitzki (1873–1953)
2017
Tekst stanowi charakterystykę dostępnych publikacji ks. prałata Carla Ulitzki (1873–1953) i stanowi przyczynek do poznania postaci oraz działalności proboszcza i działacza społecznego i politycznego, ale także wgląd w sytuację społeczną, polityczną i religijną na Górnym Śląsku w I połowie XX w. Teksty mają charakter popularnonaukowy i w większości zostały opublikowane na łamach ówczesnej prasy, dzięki czemu rozpowszechniały i popularyzowały myśl i zamierzenia autora. Dostępne teksty zasadniczo dotyczą trzech tematów: pisma z obszaru szeroko rozumianej religijności, teksty dotyczące zagadnień historycznych oraz publikacje z obszaru polityki, które stanowią najobszerniejszy dział.
Assessing the metacognitive reading awareness of Finnish high school students
2015
Kyky lukea akateemisia tekstejä englannin kielellä on entistä tärkeämpi taito kolmannen asteen koulutuksessa. Pohja tälle taidolle muodostuu toisen asteen koulutuksessa, eli useimmiten lukiossa. Toisen kielen – useimmiten siis englannin – opetussuunnitelman neljäs kurssi keskittyy lukustrategioiden opettamiseen. Lukustrategioita opetetaan, koska niillä on tutkitusti merkitystä etenkin haastavissa toisen kielen teksteissä, joita oppilaat tulevat kohtaamaan. ”Strategia” ymmärretään usein tietoiseksi prosessiksi, jossa lukija on tietoinen käyttäessään strategiaa. Tietoisuuden ollessa mukana puhutaan metakognitiivisista lukustrategioista. Näiden strategioiden käyttöön on luotu kysely, jota tämä…