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  • 1
    facet.materialart.
    Unknown
    Leidorf
    Publication Date: 2021-03-29
    Description: The analysis of desert soils near archaeological sites allowed new insights in the environmental and living conditions of the early inhabitants of the Wadi Howar (NW Sudan) and their interactions with their environment. It also provided us with more information about the soil genesis in arid regions. Further studies should concentrate on dating the described indicators of a more humid climate in the eastern Sahara during the Holocene.
    Description: Begleitende bodenkundliche Studien im Rahmen archäologischer Untersuchungen zur Besiedelungsgeschichte des Nordwest-Sudans im Holozän
    Description: The field work was possible within the scope of the Sonderforschungsbereich 389 ACACIA (Arid Climate Adaption and Cultural Innovation in Africa) of the University of Cologne, sub-project A2 »Wadi Howar: Siedlungsraum und Verkehrsweg am Südrand der Libyschen Wüste.« This project owes its funding to the Deutsche Forschungsgemeinschaft (DFG ).
    Description: research
    Keywords: 551 ; VP 400 ; VOA 000 ; TWC 500 ; VPO 000 ; VOI 230 ; Aride Regionen {Bodenkunde} ; Bodenuntersuchung, Bodenanalyse ; Klimaschwankungen und Klimaänderungen im Quartär ; Westafrika, Sudan und Guinealänder {Bodenkunde} ; Salzböden, Wüstenböden ; Sudan ; Archaeology ; climate change ; human impact ; Sudan 〈Nordwest〉 ; Wadi Howar ; Archäologische Stätte ; Wüstenboden ; Holozän ; Klimaänderung ; 38.61 ; 38.69 ; 38.19
    Language: English
    Type: article , publishedVersion
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  • 2
    facet.materialart.
    Unknown
    ARGE GMIT, Bonn
    In:  SUB Göttingen
    Publication Date: 2022-09-01
    Description: Die Ausgabe der Geowissenschaftlichen Mitteilungen vom März 2007 enthält die Themenblöcke: Geofokus: Submarine Hysrothermalquellen - Treffpunkte von Geologie, Geochemie und Biologie, Geoaktiv (Wirtschaft, Beruf, Forschung und Lehre), Geolobby (Gesellschaften, Verbände, Institutionen), Georeport (Neue Bücher, Neue Karten, Personalia, Tagungsberichte)
    Description: DFG, SUB Göttingen
    Description: journal
    Description: DFG, SUB Göttingen
    Keywords: ddc:550
    Language: German
    Type: doc-type:book
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  • 3
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    Unknown
    ARGE GMIT, Bonn
    In:  SUB Göttingen
    Publication Date: 2022-09-01
    Description: Die Ausgabe der Geowissenschaftlichen Mitteilungen vom September 2007 enthält die Themenblöcke: Geofokus: Das neue Museum für Naturkunde Berlin - Evolution in Aktion, Geoaktiv (Wirtschaft, Beruf, Forschung und Lehre), Geolobby (Gesellschaften, Verbände, Institutionen), Georeport (Neue Bücher, Personalia, Tagungsberichte)
    Description: DFG, SUB Göttingen
    Description: journal
    Description: DFG, SUB Göttingen
    Keywords: ddc:550
    Language: German
    Type: doc-type:book
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  • 4
    facet.materialart.
    Unknown
    ARGE GMIT, Bonn
    In:  SUB Göttingen
    Publication Date: 2022-09-01
    Description: Die Ausgabe der Geowissenschaftlichen Mitteilungen vom Juni 2007 enthält die Themenblöcke: Geofokus: Quasikristalle - von einer Kuriosität zum neuen Material , Geoaktiv (Wirtschaft, Beruf, Forschung und Lehre), Geolobby (Gesellschaften, Verbände, Institutionen), Georeport (Multimedia, Neue Bücher, Neue Karten, Personalia, Tagungsberichte)
    Description: DFG, SUB Göttingen
    Description: journal
    Description: DFG, SUB Göttingen
    Keywords: ddc:550
    Language: German
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  • 5
    facet.materialart.
    Unknown
    ARGE GMIT, Bonn
    In:  SUB Göttingen
    Publication Date: 2022-09-01
    Description: Die Ausgabe der Geowissenschaftlichen Mitteilungen vom Dezember 2007 enthält die Themenblöcke: Geofokus: Gashydrate der Meeresböden: Methanspeicher im Ozean, Geoaktiv (Wirtschaft, Beruf, Forschung und Lehre), Geolobby (Gesellschaften, Verbände, Institutionen), Georeport (Neue Bücher, Neue Karten, Personalia, Tagungsberichte)
    Description: DFG, SUB Göttingen
    Description: journal
    Description: DFG, SUB Göttingen
    Keywords: ddc:550
    Language: German
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  • 6
    Publication Date: 2022-08-02
    Description: Im Aufschluss Nußloch südlich von Heidelberg ist ein neu aufgeschlossener Lößrücken paläopedologisch aufgenommen und ein Standardprofil mit verschiedenen Methoden untersucht worden. Im Einzelnen wurden Sedimentanalysen (Korngrößen, Kohlenstoff, Kalkgehalt) und die magnetische Suszeptibilität bestimmt, biomorphologische und malakologische Untersuchungen durchgeführt sowie 27 Proben mit der IRSL-Methode datiert. Stratigraphisch umfasst der untersuchte Abschnitt das Jungpleistozän mit einem mehrgliedrigen Eem-Boden und einem ungewöhnlich mächtigen Würmlöß (ca. 18 m). Bodentypologisch wurden ein Bt-Horizont, eine Humuszone und zahlreiche Nassböden von unterschiedlicher Intensität mit und ohne Verbraunungszone nachgewiesen. Von den fünf ausgewiesenen Verbraunungszonen (WB2 - WB6) sind WB2, WB4 und WB5 aufgrund der Molluskenführung als interstadiale Bildungen anzusehen. Hinzu kommt noch eine der drei interstadialen Mosbacher Humuszonen (WB1) im stark reduzierten Altwürmabschnitt mit einem Alter von ca. 75 ka BP. Als kräftigster Interstadialboden ist der Bv-Horizont einer arktischen Braunerde erkannt worden (WB4), welcher aufgrund verschiedener Kriterien mit dem Lohner Boden bei ca. 30 ka BP parallelisiert wurde. Der im Hangenden des Lohner Bodens überlieferte Jungwürmlöß ist mit 12 m für Mitteleuropa sehr mächtig und von zahlreichen Nassböden (mindestens 10) untergliedert. Besonders aufgespaltet ist der Bereich des E2-Nassbodens, in dem auch die Böden WB5 und WB6 mit schwachen Verbraunungszonen liegen. Auch der jüngste Jungwürmlöß über dem Leithorizont des Eltviller Tuffs ist mit 4,5 m relativ mächtig und mehrgliedrig überliefert, so dass von einem E4/E5-Komplex gesprochen wird. Die paläopedologischen Befunde stimmen hervorragend mit den Veränderungen in der Molluskenfauna und der Suszeptibilitätskurve überein, so dass detaillierte stratigraphische und paläoklimatische Rekonstruktionen möglich sind. Die absoluten Altersdatierungen bestätigen dabei weitgehend die vorgenommenen Alterseinstufungen. Abschließend wird das neu bearbeitete Profil in Nußloch mit Ergebnissen von ANTOINE et al. (2001) verglichen, welche im gleichen Aufschluss an anderer Stelle erzielt worden sind.
    Description: research
    Keywords: ddc:551.7
    Language: German
    Type: doc-type:article , publishedVersion
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  • 7
    Publication Date: 2022-09-05
    Description: Ein Eurypteriden-Fund aus dem Unter-Siegenium von Betzdorf/Sieg wird beschrieben und abgebildet. Es handelt sich dabei um den ersten sicheren Nachweis der Familie Erieopteridae für das Siegenium des Siegerlandes. Eine Übersicht der assoziierten Fossilien wird gegeben. Darunter befinden sich Reste trigonotarbider Spinnentiere und des Myriapoden Eoarthropleura. Der erstmalige Nachweis luftatmender Trigonotarbiden und wahrscheinlich amphibisch lebender Eoarthropleuriden im Bereich des Siegener Hauptsattels ist von besonderem paläoökologischem Interesse, da hiermit die räumliche Nähe des Ablagerungsraumes zu ehemaligen Auftauchbereichen dokumentiert wird.
    Description: Abstract: A eurypterid from Early Siegenian strata near Betzdorf/Sieg is described and figured. This specimen is the first unequivocal record of the family Erieopteridae from the Siegenian of the Siegerland. The associated biota is briefly discussed and comprises trigonotarbid arachnids and the myriapod Eoarthropleura. This first record of landdwelling trigonotarbids and probably amphibious myriapods in the Siegen-Anticline is of palaeoecological significance as it documents the proximity of the depositional setting to former subaerially exposed areas.
    Description: research
    Keywords: ddc:565
    Language: German
    Type: doc-type:article , publishedVersion
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  • 8
    Publication Date: 2022-07-29
    Description: Infolge eines Schadensereignisses wurde in einem Hangabschnitt im Mittelrheintal oberhalb der Bundesstraße B 9 bei Trechtingshausen eine erhebliche Steinschlaggefahr festgestellt. Um den Verkehr möglichst wenig zu beeinträchtigen, sind die notwendigen Sicherungsmaßnahmen in getrennten Schritten durchgeführt worden. Als Sofortmaßnahme wurden zunächst die akut absturzgefährdeten Felskörper im Schutz verschiedener provisorischer Sicherungsmaßnahmen beräumt. Teile dieser Maßnahmen wurden danach als Temporärsicherungen im Hang belassen, bis der Streckenabschnitt letztendlich mit Hilfe von Systemfangzäunen langfristig gesichert werden konnte.
    Description: Abstract: After an incident, a considerable rockfall hazard was determined for a section of the Bundesstraße B 9 near Trechtingshausen (rhine-valley). To impair traffic as little as possible, the necessary safety measures were carried out in different steps. As an emergency precaution all obviously instable rocks were cleared away first. Therefore installed safety fences were left in the slope as temporary precautions until special rockfall barriers were set up for long term protection.
    Description: report
    Keywords: ddc:620
    Language: German
    Type: doc-type:article , publishedVersion
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  • 9
    facet.materialart.
    Unknown
    Publication Date: 2022-07-29
    Description: Der rheinland-pfälzische Teil des Oberrheingrabens ist im bundesweiten Vergleich als Standort tiefengeothermischer Projekte besonders gut geeignet. Die Grabenstruktur verursacht ein regionales Wärmehoch mit hohem geothermischen Gradienten. Eine Nutzung dieser geothermischen Anomalie ermöglicht die Verstromung und Bereitstellung von Wärme in Wärmenetzen. Konvektiver Wärmetransport durch aufsteigende Tiefenwässer und Wasserhöffigkeit in ausreichender Tiefe machen das Gebiet der Vorderpfalz für eine hydrothermale Nutzung besonders interessant. In dieser Region kommen triassische Gesteine, Rotliegend-Sedimente sowie Kristallines Grundgebirge aufgrund der Tiefenlage, der ausgebildeten Klüftigkeit und der Existenz tiefgreifender Störungsstrukturen für eine hydrothermale Erschließung in Betracht. Außerhalb des Oberrheingrabens sind die geothermischen Verhältnisse in Rheinland- Pfalz als durchschnittlich anzusehen. In Rheinland-Pfalz werden Thermalwässer schon seit Jahrhunderten vorrangig zu balneologischen Zwecken genutzt. Erst die Verabschiedung des „Erneuerbaren-Energien- Gesetzes“ (EEG) im Jahr 2000 rückte die Nutzung tiefer geothermischer Ressourcen in den Bereich einer wirtschaftlichen Rendite. Zwischenzeitlich wurde in der Vorderpfalz zwischen der französischen Landesgrenze und Speyer mit dem Bau von vier geothermischen Kraftwerken und der Planung weiterer Projekte begonnen. Bei einem planmäßigen Projektverlauf wird Ende 2007 in Landau das erste Geothermiekraftwerk in Rheinland- Pfalz seinen Betrieb aufnehmen. Die Erschließung petrothermaler Lagerstätten wird in Rheinland-Pfalz noch nicht betrieben. Um das Hot-Dry-Rock-Verfahren (HDR) als technische Anwendung zu etablieren muss insbesondere die hydraulische Stimulationstechnik weiter entwickelt und erprobt werden. Vielversprechend erscheint zum heutigen Zeitpunkt die Bereitstellung von Wärme mit Hilfe von tiefen Erdwärmesonden. In Rheinland- Pfalz sind zahlreiche nicht verwahrte Tiefbohrungen aus der Kohlenwasserstoff- Industrie vorhanden und könnten kostengünstig für den Sondeneinbau genutzt werden.
    Description: The Upper Rhinegraben in Rhineland-Palatine is – in a nationwide comparison – a particularly well suitable location for deep-depth geothermal projects. A regional temperature high causes enhanced geothermal gradients in this graben structure and enables geothermal electrification and provision of heat in domestic heat networks. Due to convective heat transmission caused by uprising deep-depth water and potential ground water yield in sufficient depth, this area is of special interest for geothermal utilization. Triassic rocks, Permian sediments as well as crystalline basement can – due to their depth, developed joints and the existence of deep fault systems – be considered for geothermal usage. Beyond the Upper Rhinegraben in Rhineland-Palatinate the geothermal conditions are on average level. 135 Mainzer geowiss. Mitt. 35 S. 135–158 10 Abb. 1 Tab. Mainz, Oktober 2007 In Rhineland-Palatinate thermal water has been used for balneological purposes for decades. After all, the passing of the „Erneuerbare-Energien-Gesetz“ (EEG) made the use of deep-depth geothermal resources economically profitable. In the meantime four geothermal power-plants are being built between the French border and Speyer and a few more are in the design stage. If the project proceeds as scheduled, the first geothermal power-plant in Rhineland-Palatinate will go into service in the end of 2007. The development of petrothermal deposits has not yet been done in Rhineland-Palatinate so far. To establish the Hot-Dry-Rock-Technique (HDR) as a technical employment, the hydraulic simulation technology in particular has to be advanced and tested. At the present stage the provision of heat with deep-depth bore hole heat exchangers seems to be more promising. In Rhineland-Palatinate there are numerous unused deep wells from the hydrocarbon industry existing which could be used cost-efficiently for the installation of bore hole heat exchangers.
    Description: 1. Einleitung 2. Grundlagen der Nutzung tiefer geothermischer Ressourcen 3. Tiefengeothermische Bedingungen in Rheinland-Pfalz 3.1. Thermische Verhältnisse in der Vorderpfalz 3.2. Hydrogeologische Verhältnisse in der Vorderpfalz 3.3. Hydrothermale Zielhorizonte in der Vorderpfalz 3.4. Petrothermale Lagerstätten 4. Nutzung tiefer geothermischer Ressourcen in Rheinland-Pfalz 5. Ausblick Schriften
    Description: research
    Keywords: ddc:333.88 ; ddc:554.3
    Language: German
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  • 10
    Publication Date: 2022-07-22
    Description: An Bohrkernen aus dem Zechstein und Unteren Buntsandstein des Nordrandes der Pfälzer Mulde wurden in Triaxialzellen Versuche zur Bestimmung der vertikalen hydraulischen Leitfähigkeiten durchgeführt. Die Versuche dienten der Ergänzung und Verbesserung der bislang wenigen verfügbaren Daten zu geohydraulischen Kennwerten für diesen hydrogeologischen Teilraum. Die Versuchsanordnung wird erläutert; auf Probleme bei der Versuchsdurchführung wird hingewiesen. Die Ergebnisse werden diskutiert und bisher ermittelten Werten gegenüber gestellt. Der ermittelte Wertebereich der vertikalen hydraulischen Leitfähigkeiten liegt zwischen etwa 3 x 10–6 m/s bis 2 x 10–9 m/s (Medianwerte). Er gilt für den durch die Gesteinsmatrix bedingten Anteil der Gebirgsdurchlässigkeit. Das Verhältnis von vertikaler zu horizontaler hydraulischer Leitfähigkeit kann in den Größenordnungen von etwa 1:101 bis 1:103 angesetzt werden. Die Ergebnisse lassen vermuten, dass die räumliche Verteilung der Permeabilitäten im Untersuchungsgebiet bereits sehr kleinmaßstäblich durch sedimentäre und diagenetische Faziesvariationen beeinflusst wird.
    Description: Abstract: At drill cores from the Upper Permian (Zechstein) and the Lower Bunter of the northern Palatinate Syncline experiments were accomplished in triaxial cells to determine the vertical hydraulic conductivity. The experiments served for the addition and improvement of the past data set of geohydraulic parameters. The experimental assembly is described and it is referred to problems during the investigational procedure. The results are discussed and compared with so far published data. The range of the determined values of vertical hydraulic conductivity lies between approximately 3 x 10–6 m/s to 2 x 10–9 m/s (median values). It applies to the portion of the rock permeability due to the rock matrix. The ratio of vertical to horizontal hydraulic conductivity can be set in the orders of magnitude from approximately 1:101 to 1:103. The results let assume that the spatial distribution of the permeability in the area of interest is affected already by very small scale sedimentary and diagenetic facies variations.
    Description: research
    Keywords: ddc:551.49
    Language: German
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  • 11
    Publication Date: 2023-03-28
    Description: Im Alfbachtal im quartären Vulkanfeld der Westeifel führte die Eruption mehrerer Schlackenkegel während der Weichsel-Eiszeit zur Bildung einer Barriere, vor der sich eine bis zu 51 m mächtige Abfolge aus Lavaströmen und Sedimenten bildete. In einer Bohrung bei Gillenfeld besteht die Talfüllung über einer basalen 70 cm mächtigen mafischen Tephra aus einer unteren Abfolge etwa 22 m mächtiger pelitischer feingeschichteter Seesedimente und oberhalb einer Erosionsdiskordanz aus einer oberen Abfolge etwa 10 m mächtiger fluviolakustriner Grobklastika, Pelite und Mudden. Nach Radiokohlenstoff-Datierungen, Korrelation von Tephren und faziellen Korrelationen mit Sedimenten der Eifelmaare wurden die oberen fluviolakustrinen Sedimente zwischen etwa 14 600 und 11 800 BP und die unteren lakustrinen Pelite zwischen etwa 31 000 und 25 600 BP abgelagert. In dem Zeitraum von etwa 27500 bis 25700 BP eruptierten mindestens 13 Maare im Südost-Teil in der Westeifel. Mafische Maartephren in den Sedimenten des ehemaligen Alf-Stausees werden beschrieben und für einige dieser Tephren werden mögliche Eruptionspunkte diskutiert.
    Description: Abstract: In the Alf valley in the Quaternary Westeifel Volcanic Field the eruption of several scoria cones during the Weichsel Glacial resulted in the formation of a natural dam and an up to 51 m thick sequence of lava flows and sediments was formed upstream. In a drilling near Gillenfeld the valley fill consists of a basal 70 cm thick mafic tephra, a lower sequence of c. 22 m thick pelitic finely bedded lacustrine sediments and resting upon an erosional discordance an upper sequence of c. 10 m thick fluviolacustrine coarse clastics, pelites and organic lake sediments. According to radiocarbon dating, tephra chronology and facies correlation with sediments of Eifel maars the upper fluviolacustrine sediments were deposited between c. 14 600 and 11 800 BP and the lower lacustrine pelites between c. 31 000 and 25 600 BP. In the time interval from c. 27500 to 25700 BP at least 13 maars erupted in the SE-part of the Westeifel. Mafic maar tephra in the sediments of the former Alf Lake are described and for some of these tephra possible eruption centers are discussed.
    Description: 1. Einleitung 2. Geologie um Gillenfeld 3. Material und Methodik 4. Ergebnisse der Bohrung Gillenfeld GWM1 4.1. Lithologisches Profil 4.2. Datierung des Bohrkerns 4.3. Magnetische Suszeptibilität des Bohrkerns und potenzieller Liefergesteine 4.4. Geologische Interpretation der Schichtfolge 4.5. Ausblick 5. Zusammenfassung Schriften
    Description: research
    Keywords: ddc:554.3 ; Eifel ; Pleistozän ; Sediment ; TK 5807
    Language: German
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  • 12
    Publication Date: 2023-04-05
    Description: Drei Kernbohrungen vom amerikanischen Militär-Flughafen Spangdahlem wurden untersucht. Sie erschließen den wenig bekannten Buntsandstein im Nordostteil der Trierer Bucht. Genormte Farbangaben, Gerölldaten und eine Auswertung der Sandkomponenten ergänzen die petrofaziellen Profilbeschreibungen. Die Kernprofile sind log- und lithostratigraphisch gut einzustufen. Damit liefern sie wichtige Daten zur Abgrenzung und zur Ermittlung des regionalen Faziesmusters der Schichtglieder im weiteren Grenzbereich Mittlerer/Oberer Buntsandstein. Eine Überprüfung überregionaler stratigraphischer Deutungsansätze, wie sie in früheren Arbeiten ausformuliert wurden, ist damit möglich. Insbesondere die in einer geröllarmen Schwellenbzw. Randfazies entwickelten Gesteinsabfolgen der Solling-Folge (s6) sind sehr aussagekräftig. Die faziell prägnanten und relativ mächtigen Violetten Grenzschichten (sVGS) überlagern die Konglomeratische Serie (Usch-Schichten bei Mader 1979–1992) und schließen den Mittleren Buntsandstein ab. Die Fazies vom Mittleren und Oberen Buntsandstein der Spangdahlem-Region belegt eine paläogeographische Randlage im südöstlichen Bitburger Becken. Es dokumentiert sich eine strukturelle Kontrolle durch die alt angelegte, Südwest-Nordost streichende Luxemburger Zentralschwelle (Schwelle von Dahlem). Die im Beckenzentrum noch markant entwickelten fluviatilen Grobschüttungen im tieferen Mittleren Buntsandstein (Basalkonglomerat, Kieselkonglomerat) sind bei Spangdahlem nur noch schwach ausgeprägt. Dies ist auch einer östlichen Randposition in Bezug zu den rheinisch streichenden Grabenzonen im Zentralbereich der Eifeler Nord-Süd-Zone zuzuschreiben.
    Description: Abstract: Three core borings from the US-Air Base in Spangdahlem were investigated. They revealed the less-known Buntsandstein (Lower Triassic) in the northeastern part of the Trier Embayment. Rock Color Chart values, gravel- and sand composition data supplemented the petrographic descriptions. By means of both the log and the lithology the cores are easy to classify stratigraphically. They yielded useful informations about the regional stratification and the definition of the Middle/Upper Buntsandstein boundary. This made it possible to check former transregional stratigraphic interpretations. In particular, the sand-dominated successions of the Solling-Folge (s6) give very important informations. The facially conspicuous and relatively thick Violette Grenzschichten overlie the Konglomeratische Serie (the former Usch-Schichten after Mader 1979-1992) and complete the Middle Buntsandstein. The facies of the Middle and Upper Buntsandstein of the Spangdahlem area proves a paleogeographic border position in the southeastern Bitburg Basin. It also shows a structural control by the SW-NE striking Luxemburg Central Swell (Dahlem Swell). The coarse fluvial intervals of the lower Middle Buntsandstein which are prominent in the centre of the basin are weakly represented in the Spangdahlem area. This is due to its eastward position in relation to the rhenish striking graben zones in the central part of the Eifel north-south zone.
    Description: 1.Einleitung 1.1. Geographische und geologische Lage der Kernbohrungen 1.2. Bisheriger Kenntnisstand 1.3. Vorgehensweise und Art der Untersuchungen 2. Schichtenfolge der Kernprofile Spangdahlem 2.1. Unterdevon 2.2. Mittlerer Buntsandstein 2.2.1. Basalkonglomerat (sBlk) 2.2.2. Densborn-Schichten (sDb) 2.2.3. Violettschichten (sVS) 2.2.4. Konglomeratische Serie (sKS) 2.2.5. Violette Grenzschichten (sVGS) 2.3. Oberer Buntsandstein 2.3.1. Malbergweich-Schichten (soZM) 2.3.2. Kyllburg-Schichten (soZK) 3. Vergleiche mit anderen Buntsandstein-Profilen des Bitburger Beckens 4. Paläotektonische Ausdeutung der Spangdahlemer Bohrprofile 5. Ausblick Schriften
    Description: research
    Keywords: ddc:554.3 ; Eifel ; Trier-Bitburger Mulde ; Buntsandstein ; TK 6006
    Language: German
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  • 13
    Publication Date: 2024-02-28
    Description: Dieser Artikel diskutiert den Charakter von Pollentypen. Wir argumentieren, dass Pollentypen und Pflanzentaxa komplett unterschiedliche Entitäten (morphologische bzw. taxonomische) sind, und deswegen unterschiedlich behandelt und dargestellt werden sollten. Allgemeine Probleme der konventionellen Nomenklatur von Pollentypen werden anhand von Beispielen aus der europäischen palynologischen Praxis illustriert. Wir plädieren für Deutlichkeit in der Nomenklatur von Pollentypen und für die wissenschaftliche Freiheit, ‘unkonventionelle‘ Methoden zu benutzen, um Verwirrung zu vermeiden.
    Description: research
    Keywords: ddc:551.7 ; palynological methods ; pollen morphology ; pollen type nomenclature
    Language: English
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  • 14
    Publication Date: 2007
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  • 15
    Publication Date: 2007
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  • 16
    Publication Date: 2007
    Description: Das deutsche System des Zivil- und Katastrophenschutzes mit seinen zahlreichen freiwilligen und gemeinnützigen Helfern ist weltweit einzigartig. Die deutschen Hilfsorganisationen haben auch international einen guten Ruf und werden häufig für Auslandsansätze angefragt. Aber gerade durch die Vielzahl der verschiedenen Beteiligten gestaltet sich Koordination in einem größeren Katastrophenfall sehr schwierig. Hinzu kommt, dass das föderale System Deutschlands noch eine weitere Hürde darstellt, wenn verschiedene Bundesländer von der Katastrophe betroffen sind. Die vorliegende wissenschaftliche Arbeit untersucht die Katastrophenbewältigung in Deutschland. Hierzu wurde das Fallbeispiel der Flut 2002 herangezogen. Nach einer Einleitung, die kurz auf die rechtlichen Grundlagen des Zivil- und Katastrophenschutzes und weitere Rahmenbedingung in Deutschland eingeht, folgt die Identifizierung der Problemfelder. Hieraus werden Verbesserungsansätze für den deutschen Zivil- und Katastrophenschutz abgeleitet. Es wird aufgezeigt, welche davon bereits in der Umsetzung sind und was darüber hinaus zur Verbesserung der zivilen Katastrophenbewältigung getan werden müßte. Ergänzt wird die Arbeit durch praktische Beispiele wie die Taktische Sandsackreserve Deutschland als funktionierende Ressourcenmanagementzentrale.
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  • 17
    Publication Date: 2007
    Description: The German federal state of Saxony was the most affected region during the severe flood in August 2002, and damage to companies was high. A survey of 415 companies representing a variety of sectors and sizes was undertaken to identify deficits in the flood management of companies. In August 2002, preparedness and precaution of companies was low. Additionally, 45% of the companies had not received any flood warning. Consequently, many companies were unable to perform emergency measures successfully. The mean total damage to companies amounted to 1.1 million euros. However, because of relatively good flood compensation, recovery advanced quickly. After the flood, preparedness and precaution increased, but there is still significant potential for more precautionary measures. The flood warning system should be further improved. Specific incentive and communication programs should be developed for the service and financial sectors, where preparedness and precaution is weakest, as well as for the manufacturing sector, which has the highest damage potential.
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  • 18
    Publication Date: 2007
    Description: In August 2002, a severe flood event occurred in Central Europe. In the following year, a poll was performed in Germany in which 1697 private households were randomly selected from three regions: (a) the River Elbe area, (b) the Elbe tributaries in Saxony and Saxony-Anhalt, and (c) the Bavarian Danube catchment. Residents were interviewed about flood characteristics, early warning, damage, recovery, preparedness and previously experienced floods. Preparedness, response, financial losses and recovery differed in the three regions under study. This could be attributed mainly to differences in flood experience and flood impact. Knowledge about self-protection, residents' home-ownership and household size influenced the extent and type of private precautions taken, as well as the residents' ability to perform mitigation measures. To further improve preparedness and response during future flood events, flood warnings should include more information about possible protection measures. In addition, different information leaflets with flood mitigation options for specific groups of people, e.g. tenants, homeowners, elderly people or young families, should be developed.
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  • 19
    Publication Date: 2007
    Description: A survey after the 2002 flood in Germany identifies contact with floodwater as a risk factor for diarrhea and injuries and shows that the affected population valued the given professional support in securing homes and cleanup work. Evacuations were well tolerated. Information reached the population mainly through loudspeakers, radio, and TV.
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  • 20
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    In:  Earth and Planetary Science Letters, pp. 70-84, vol. 255, no. 1-2
    Publication Date: 2007
    Keywords: TF I ; Task Force I ; Earth Accretionary Systems
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  • 21
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    In:  Environmental Geology, pp. 1113-1117, vol. 51, no. 7
    Publication Date: 2007
    Keywords: TF III ; Task Force III ; Lithosphere-Astenosphere Interactions
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  • 22
    Publication Date: 2007
    Keywords: TF IV ; Task Force IV ; Ultra-Deep Continental Crust Subduction (UDCCS)
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  • 23
    Publication Date: 2007
    Keywords: TF IV ; Task Force IV ; Ultra-Deep Continental Crust Subduction (UDCCS)
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  • 24
    Publication Date: 2007
    Keywords: TF II ; Task Force II ; New tectonic causes of volcano failure
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  • 25
    Publication Date: 2007
    Keywords: TF IV ; Task Force IV ; Ultra-Deep Continental Crust Subduction (UDCCS)
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  • 26
    Publication Date: 2007
    Keywords: TF IV ; Task Force IV ; Ultra-Deep Continental Crust Subduction (UDCCS)
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  • 27
    Publication Date: 2007
    Keywords: TF IV ; Task Force IV ; Ultra-Deep Continental Crust Subduction (UDCCS)
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  • 28
    Publication Date: 2007
    Keywords: TF IV ; Task Force IV ; Ultra-Deep Continental Crust Subduction (UDCCS)
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  • 29
    Publication Date: 2007
    Keywords: TF IV ; Task Force IV ; Ultra-Deep Continental Crust Subduction (UDCCS)
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  • 30
    Publication Date: 2007
    Keywords: TF IV ; Task Force IV ; Ultra-Deep Continental Crust Subduction (UDCCS)
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  • 31
    Publication Date: 2007
    Keywords: TF IV ; Task Force IV ; Ultra-Deep Continental Crust Subduction (UDCCS)
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  • 32
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    In:  EGU 4th General Assembly, Vienna, Austria
    Publication Date: 2007
    Keywords: TF VI ; Task Force VI ; Sedimentary Basins
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  • 33
    Publication Date: 2007
    Keywords: TF IV ; Task Force IV ; Ultra-Deep Continental Crust Subduction (UDCCS)
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  • 34
    Publication Date: 2007
    Keywords: TF II ; Task Force II ; New tectonic causes of volcano failure
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  • 35
    Publication Date: 2007
    Keywords: TF IV ; Task Force IV ; Ultra-Deep Continental Crust Subduction (UDCCS)
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  • 36
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    In:  Physics of the Earth and Planetary Interiors, pp. 124-142, vol. 160, no. 2
    Publication Date: 2007
    Keywords: TF IV ; Task Force IV ; Ultra-Deep Continental Crust Subduction (UDCCS)
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  • 37
    Publication Date: 2007
    Keywords: TF IV ; Task Force IV ; Ultra-Deep Continental Crust Subduction (UDCCS)
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  • 38
    Publication Date: 2007
    Keywords: TF I ; Task Force I ; Earth Accretionary Systems
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  • 39
    Publication Date: 2007
    Keywords: TF IV ; Task Force IV ; Ultra-Deep Continental Crust Subduction (UDCCS)
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  • 40
    Publication Date: 2007
    Keywords: TF IV ; Task Force IV ; Ultra-Deep Continental Crust Subduction (UDCCS)
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  • 41
    Publication Date: 2007
    Keywords: TF IV ; Task Force IV ; Ultra-Deep Continental Crust Subduction (UDCCS)
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  • 42
    Publication Date: 2007
    Keywords: TF IV ; Task Force IV ; Ultra-Deep Continental Crust Subduction (UDCCS)
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  • 43
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    In:  Gondwana Research, pp. 38-49, vol. 11
    Publication Date: 2007
    Keywords: TF IV ; Task Force IV ; Ultra-Deep Continental Crust Subduction (UDCCS)
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  • 44
    Publication Date: 2007
    Keywords: TF II ; Task Force II ; New tectonic causes of volcano failure
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  • 45
    Publication Date: 2007
    Keywords: TF VI ; Task Force VI ; Sedimentary Basins
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  • 46
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    In:  Contributions to Mineralogy and Petrology, vol. 154, no. 2, pp. 153-170
    Publication Date: 2007
    Keywords: TF IV ; Task Force IV ; Ultra-Deep Continental Crust Subduction (UDCCS)
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  • 47
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    In:  Geology, vol. 35, no. 7, pp. 587-590
    Publication Date: 2007
    Keywords: TF IV ; Task Force IV ; Ultra-Deep Continental Crust Subduction (UDCCS)
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  • 48
    Publication Date: 2007
    Keywords: TF II ; Task Force II ; New tectonic causes of volcano failure
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  • 49
    Publication Date: 2007
    Keywords: TF II ; Task Force II ; New tectonic causes of volcano failure
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  • 50
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    In:  Journal Geological Society London, pp. 31-47, vol. 164
    Publication Date: 2007
    Keywords: TF I ; Task Force I ; Earth Accretionary Systems
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  • 51
    Publication Date: 2007
    Keywords: TF IV ; Task Force IV ; Ultra-Deep Continental Crust Subduction (UDCCS)
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  • 52
    Publication Date: 2007
    Description: Niederschlagsgradient im Ostharz von Sachsen Anhalt untersucht. Untersuchung lief 5 Jahre incl. 2003. Bedingt erfolgreich da der Niederschlagsgradient nicht vorhanden war. KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
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  • 53
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    In:  Global Change Biology (2007) 13, 1550–1564, doi: 10.1111/j.1365-2486.2007.01394.x
    Publication Date: 2007
    Description: Biologie zum Auftreten und der Ausbreitung verschiedener Läusearten (Blatt, Baumlaus etc) durch Auswertung europaweiter Fallen, Ableitungen eines statistischen Ansatzes durch Verschneiden geografischer, klimatischer und Landnutzngsindikatoren mit dem Auftreten bestimmter Aphis-Aten, Hochrechnungen für die Zukunft KATASTER-BESCHREIBUNG: Zusammenhang zwischen den Läuseflug und der Umwelt wurde anhand von Fallenfunden über die am EXAMINE-Projekt beteiligten Länder, bzw. Partner geschätzt, Verschneiden geografischer, klimatischer und Landnutzngsindikatoren mit dem Flugverhalten, Herleiten eines stat. Models KATASTER-DETAIL: Delta T+, dann erwarteter Läuseflug in den nächsten 50 Jahren etwa 8 Tage eher Regressionsmodel: Julian Day=137.976+0.000023574*ARABLE + 0.0000390578xGRASS + 0.0000287559xSEA + 0.000102947xWATER -3.36069xC30DAY - 6.44658xC30P60DAY +0.0524365xDECPRN +0.108988xFEBRN + 0.0590551xNOVPRN ARABLE=Arable land (area in ha in a circle of R575 km), GRASS=Grassland (area in ha in a circle of R575 km), SEA=Sea (area in ha in a circle of R575 km), WATER=Inland waters (area in ha in a circle of R575 km), C30DAY=Mean temperature of the mean coldest 30 days, P60DAY=Mean temperature of the 60 days immediately after the mean coldest 30, DECPRN=Mean rainfall during the previous December, FEBRN=Mean rainfall during February, NOVPRN=Mean rainfall during the previous November
    Keywords: Europa ; 1970-2006, Szenarien ; Insekten ; Landwirtschaft ; Parasit ; Modell
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  • 54
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    In:  European journal of forest research 126(4): 529-544
    Publication Date: 2007
    Keywords: Forst ; Klima ; Trockenheit ; Witterungsextreme
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  • 55
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    In:  Allgemeine Forst Zeitschrift für Wald und Forstwirtschaft 23: 1042-1045
    Publication Date: 2007
    Description: Vergleich der Klimahüllen von 27 Baumarten mit dem heutigen und zukünftigen Klima Deutschlands, keine expliziten Angaben zu Brandenburg/Nordostdeutschland KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
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  • 56
    Publication Date: 2007
    Description: abiotische Schäden: physiologische Zustand der Bäume durch Witterungsfaktoren stärker beeinflußt als durch den Standort, Detektierung von Trockenjahren; biotische Schäden: Biomarkeranalyse zur Überwachung des Baumstresses bei Schadereignissen durch Fraßinsekten KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
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  • 57
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    In:  Benutzerhandbuch fur @RISK Risikoanalysen- und Simulations- Add-InRisikoanalysen Add-In für Microsoft® Excel Version 5.7, September, 2010 Palisade Corporation 798 Cascadilla Street Ithaca, NY 14850 USA
    Publication Date: 2007
    Description: Korrelationsanalyse zwischen Wettervariablen über mehrere Perioden und dem Zuckerrübenertrag an verschiedenen Standorten KATASTER-BESCHREIBUNG: Bildung von Wetterindexsummen über mehrere Monate im Vergleich zur Betrachtung einzelner Monate ergab keine höheren Korrelationen, höchste positive Korrelationskoeffizienten von 0,61 zwischen der Niederschlagssumme des Zeitraumes Juni bis August für den Standort Dedelow, in der Uckermark Brandesburgs. Einflusses der Temperatur auf den Zuckerertrag ergab negative Korrelationskoeffizienten, der höchste (negative) ermittelte Wert liegt bei -0,78 für die Periode Juli bis September, Dedelow. Positiven Einfluss hoher Temperaturen auf den Rübenertrag am Standort Kiel und Düse KATASTER-DETAIL:
    Keywords: Deutschland, teilw. einzelne Regionen ; 1958-2006 ; Zuckerrüben ; Ertrag ; Korrelationsmethode ; Niederschlag ; Temperatur
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  • 58
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    In:  LWF aktuell (60): 35-37
    Publication Date: 2007
    Description: Übereinstimmung der Klimahüllen versch. Baumarten mit dem heutigen und zukünftigen Klima BAYERNS KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
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  • 59
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    In:  Brandenburgische Forstnachrichten 16(128): 5-6
    Publication Date: 2007
    Description: warme Sommer 2003 und 2006 führten zur Ausbreitung des Kiefernspinners, auch andere Forstschadinsekten erreichen z.T. kritische Werte in der Ausbreitung; während des Sommers 2006 verringerte sich das Regenerationspotential von Kiefern nach vollständigem Nadelverlust auf 0% KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
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  • 60
    Publication Date: 2007
    Description: Studie zu einer prognostizierten Anzahl von Tagen mit Wärme- und mit Kältestress, basierend auf Klimaszenarien für den Zeitraum 2071 bis 2100 KATASTER-BESCHREIBUNG: Prognose: größere Zahl an Todesfällen durch Hitze im Süden gegenüber dem Norden Deutschlands und zugleich größerer Rückgang der Todesfälle durch Kälte im Norden, Anstieg der Todesopferzahl durch zunehmende Hitze insgesamt größer als Rückgang der Opferzahl durch weniger Kälte KATASTER-DETAIL:
    Keywords: Deutschland ; Umweltmedizin ; Temperatur
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  • 61
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    In:  Institut für Meteorologie, FU Berlin, Berlin
    Publication Date: 2007
    Description: Birkenpollenflug, Ambrosiaausbreitung KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Berlin ; 1984-2007 ; Umweltmedizin ; Phänologie
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  • 62
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    In:  Gesellschaft Deutsches Aboretum e.V. (eds.) Beiträge zur Gehölzkunde 2007. Hemmingen, Hansmann Verlag: 17-29
    Publication Date: 2007
    Description: heutige potentielle natürliche Waldzusammensetzung und deren Verbreitung in Brandenburg – die ursprüngliche Herkunft der Baumarten nach der Eiszeit nutzen, um klimaplastische Wälder aufzubauen KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
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  • 63
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    In:  Brandenburgische Forstnachrichten 16(128): 5-6
    Publication Date: 2007
    Description: seit Anfang der 1960er Jahre ein Trend zu einer stetigen Verfrühung des „theoretischen Vegetationsbeginns“; Risiko entsteht bei einer frühzeitigen Aufhebung des Kälteschutzes; überproportional hohen Verlust an gespeicherten Kohlenhydraten während der Vegetationsruhe; wegen hoher Wintertemperaturen hohe Niederschläge als Regen – führen zu Staunässe im Wurzelbereich KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
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  • 64
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    In:  Eberswalder Forstliche Schriftenreihe 32: 133-142.
    Publication Date: 2007
    Description: seit 1999 stetige Zunahme der Kronentransparenz bei allen Baumartengruppen – enger Zusammenhang zu trockenen Vegetationsperioden 1999/2000 KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
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  • 65
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    In:  2 -NAP 02-231 Bericht IV Interreg IIIA Literaturstudie alpine Kulturpflanzen Vs. 3.0 070425.
    Publication Date: 2007
    Description: Sammlung historischer Informationen und Dokumentation des bäuerlichen Erfahrungswissens Kulturpflanzen von der Prähistorie - 20. Jahrhundert KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Südtirol, Nordtirol und GraubündenSüdtirol, Nordtirol und Graubünden ; Kartoffeln ; Anbautermine ; Boden ; Ertrag ; Getreide ; Hafer ; Klima ; Landwirtschaft ; Mais ; Niederschlag ; Pflanzenkrankheit ; Pflanzenschädling ; Roggen ; Temperatur ; Trockenheit ; Vegetationsperiode ; Weizen ; Wetterbeobachtung ; Witterung ; Düngung ; Hackfrüchte
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  • 66
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    In:  Other Sources
    Publication Date: 2011-08-24
    Description: The NASA STARDUST mission collected thousands of particles from Comet Wild 2 that are now being studied by two hundred scientists around the world. The spacecraft captured the samples during a close flyby of the comet in 2004 and returned them to Earth with a dramatic entry into the atmosphere early in 2006. The precious cargo of comet dust is being studied to determine new information about the origin of the Sun and planets. The comet formed at the edge of the solar system, beyond the orbit of Neptune, and is a sample of the material from which the solar system was formed. One of the most dramatic early findings from the mission was that a comet that formed in the coldest place in the solar system contained minerals that formed in the hottest place in the solar system. The comet samples are telling stories of fire and ice and they providing fascinating and unexpected information about our origins.
    Keywords: Lunar and Planetary Science and Exploration
    Format: text
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  • 67
    Publication Date: 2011-08-24
    Description: There is a growing number of observational evidences of dynamic quasi-periodical magnetosphere response to continuously southward interplan etary magnetic field (IMF). However, traditional global MHD simulatio ns with magnetic reconnection supported by numerical dissipation and ad hoc anomalous resistivity driven by steady southward IMF often prod uce only quasi-steady configurations with almost stationary near-eart h neutral line. This discrepancy can be explained by the assumption that global MHD simulations significantly underestimate the reconnectio n rate in the magnetotail during substorm expansion phase. Indeed, co mparative studies of magnetic reconnection in small scale geometries demonstrated that traditional resistive MHD did not produce the fast r econnection rates observed in kinetic simulations. The major approxim ation of the traditional MHD approach is an isotropic fluid assumption) with zero off-diagonal pressure tensor components. The approximatio n, however, becomes invalid in the diffusion region around the reconn ection site where ions become unmagnetized and experience nongyrotropic behaviour. Deviation from gyrotropy in particle distribution functi on caused by kinetic effects manifests itself in nongyrotropic pressu re tensor with nonzero off-diagonal components. We use the global MHD code BATS-R-US and replace ad hoc parameters such as "critical curren t density" and "anomalous resistivity" with a physically motivated di ssipation model. The key element of the approach is to identify diffusion regions where the isotropic fluid MHD approximation is not applic able. We developed an algorithm that searches for locations of magnet otail reconnection sites. The algorithm takes advantage of block-based domain-decomposition technique employed by the BATS-R-US. Boundaries of the diffusion region around each reconnection site are estimated from the gyrotropic orbit threshold condition, where the ion gyroradius is equal to the distance to the reconnection site. Inside diffusion regions ions are treated as nongyrotropic fluid with nonzero off-dia gonal components of the pressure tensor. The primary kinetic mechanism controlling the dissipation in the diffusion region is incorporated into global MHD simulations in terms of spatially localized nongyrotropic corrections to the induction equation. The magnitude of the non-g yrotropic corrections to the electric field and spatial scales of the diffusion regions are calculated self-consistently at each time step of the simulation using local MHD plasma and field parameters at the reconnection site without introduction of any ad hoc parameters. We d emonstrated that magnetotail reconnection is inherently unsteady even when the solar wind is steady. Global MHD simulations with nongyrotropic corrections produce bursts of fast reconnection typically observe d in small-scale kinetic simulations. During the bursts the length of the diffusion region does not exceed 2R(sub E) approximates 12(c/ome ga * pi). The bursts of the fast reconnection last only for a few min utes. After reaching the maximum value the reconnection rate decreases while the length of the diffusion region increases. The decreased ra te, however, is still significantly larger that the steady reconnection rate characteristic for MHD simulations with reconnection supported by numerical resistivity alone. Magnetotail reconnection supported b y nongyrotropic effects results in a tailward retreat of the reconnection site with average speed of the order of 100 km/s, accompanied by magnetotail stretching and thin current sheet formation in the near-E arth plasma sheet. Overall magnetotail response to the steady low-mach-number solar wind with southward IMF exhibits quasi-periodic loading /unloading dynamics typical for frequently observed multiple substorm s.
    Keywords: Geophysics
    Type: 2007 US-Japan Reconnection Workshop; 26-29 Mar. 2007; Saint Michaels, MD; United States
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  • 68
    Publication Date: 2011-08-26
    Description: .We interpret observations of trace-gases from three satellite platforms to provide top-down constraints on the production of NO by lightning. The space-based observations are tropospheric NO2 columns from SCIAMACHY, tropospheric O3 columns from OMI and MLS, and upper tropospheric HNO3 from ACE-FTS. A global chemical transport model (GEOS-Chem) is used to identify locations and time periods in which lightning would be expected to dominate the trace gas observations. The satellite observations are sampled at those locations and time periods. All three observations exhibit a maximum in the tropical Atlantic region and a minimum in the tropical Pacific. This wave-1 pattern is driven by injection of lightning NO into the upper troposphere over the tropical continents, followed by photochemical production of NO2, HNO3, and O3 during transport. Lightning produces a broad enhancement over the tropical Atlantic and Africa of 2-6 x 10(exp 14) molecules NO2/sq cm, 4 x 10(exp 17) molecules O3/sq cm (15 Dobson Units), and 125 pptv of upper tropospheric HNO3. The lightning background is 25-50% weaker over the tropical Pacific. A global source of 6+/-2 Tg N/yr from lightning in the model best represents the satellite observations of tropospheric NO2, O3, and HNO3.
    Keywords: Meteorology and Climatology
    Type: Journal of Geophysical Research; Volume 112
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  • 69
    Publication Date: 2012-03-16
    Description: An alternative optical thermometry technique that utilizes the low-resolution (order 10(exp 1)/cm) pure-rotational spontaneous Raman scattering of air is developed to aid single-shot multiscalar measurements in turbulent combustion studies. Temperature measurements are realized by correlating the measured envelope bandwidth of the pure-rotational manifold of the N2/O2 spectrum with a theoretical prediction of a species-weighted bandwidth. By coupling this thermometry technique with conventional vibrational Raman scattering for species determination, we demonstrate quantitative spatially resolved, single-shot measurements of the temperature and fuel/oxidizer concentrations in a high-pressure turbulent Cf4-air flame. Our technique provides not only an effective means of validating other temperature measurement methods, but also serves as a secondary thermometry technique in cases where the anti-Stokes vibrational N2 Raman signals are too low for a conventional vibrational temperature analysis.
    Keywords: Optics
    Type: Measurement Science and Technology (ISSN 0957-0233); Volume 19; No. 1
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  • 70
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    In:  CASI
    Publication Date: 2013-04-10
    Description: Provides an overview of the X-48B prototype system flight test including vehicle characteristics and configuration. There are two X-48B Vehicles: the first, Vehicle 1, is the wind tunnel and flight test model. The second, Vehicle 2, provides the primary flight test. In mid-May 2006 the research team successfully completed 250 hours of wind tunnel tests on the X-48B Vehicle 1 at NASA's Langley Air Force Base. The prototype was then shipped to NASA's Dryden Flight Research Center at Edwards Air Force Base to serve as a backup to Vehicle 2, which is used for planned remotely piloted flight tests at Dryden.
    Keywords: Aircraft Design, Testing and Performance
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  • 71
    Publication Date: 2019-04-04
    Description: A hyperthermophilic, sulfur-reducing, organo-heterotrophic archaeon, strain OGL-20P was isolated from black smoker chimney material from the Rainbow hydrothermal vent site on the Mid-Atlantic Ridge (36.2 N, 33.9 W). The cells of strain OGL-20P(sup T) have an irregular coccoid shape and are motile with a single flagellum. Growth was observed within the pH range 5.0-8.5 (optimum pH 7.0), NaCl concentration range 1-5 % (w/v) (optimum 3%), and temperature range 55-94 C (optimum 83-85 C). The novel isolate is strictly anaerobic and obligately dependent upon elemental sulfur as an electron acceptor, but it does not reduce sulfate, sulfite, thiosulfate, iron (III) or nitrate. Proteolysis products (peptone, bacto-tryptone, casamino-acids, and yeast extract) are utilized as substrates during sulfur-reduction. Strain OGL-20P(sup T) is resistant to ampicillin, chloramphenicol, kanamycin, and gentamycin, but sensitive to tetracycline and rifampicin. The G+C content of DNA is 52.9 mol%. The 16S rRNA gene sequence analysis revealed that strain OGL-20P(sup T) is closely related to Thermococcus coalescens and related species, but no significant homology by DNA-DNA hybridization was observed between those species and the new isolate. On the basis of physiological and molecular properties of the new isolate, we conclude that strain OGL-20P(sup T) represents a new separate species within the genus Thermococcus, and propose the name Thermococcus thioreducens sp. nov. The type strain is OGL-20P(sup T) (= ATCC BAA-394(sup T) = JCM 12859(sup T) = DSM 14981(sup T)).
    Keywords: Life Sciences (General)
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  • 72
    Publication Date: 2019-04-04
    Description: We show that the strength of the magnetic field in the area covered by the flare arcade following a CME-producing ejective solar eruption can be estimated from the final angular width of the CME in the outer corona and the final angular width of the flare arcade. We assume (1) the flux-rope plasmoid ejected from the flare site becomes the interior of the CME plasmoid, (2) in the outer corona (R greater than 2R(sub Sun)) the CME is roughly a spherical plasmoid with legs shaped like a light bulb, and (3) beyond some height in or below the outer corona the CME plasmoid is in lateral pressure balance with the surrounding magnetic field. The strength of the nearly radial magnetic field in the outer corona is estimated from the radial component of the interplanetary magnetic field measured by Ulysses. We apply this model to three well-observed CMEs that exploded from flare regions of extremely different size and magnetic setting. One of these CMEs is an over-and-out CME that exploded from a laterally far offset compact ejective flare. In each event, the estimated source-region field strength is appropriate for the magnetic setting of the flare. This agreement (1) indicates that CMEs are propelled by the magnetic field of the CME plasmoid pushing against the surrounding magnetic field, (2) supports the magnetic-arch-blowout scenario for over-and-out CMEs, and (3) shows that a CME s final angular width in the outer corona can be estimated from the amount of magnetic flux covered by the source-region flare arcade.
    Keywords: Solar Physics
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  • 73
    Publication Date: 2019-04-04
    Description: The lunar surface is covered with a thick layer of sub-micron/micron size dust grains formed by meteoritic impact over billions of years. The fine dust grains are levitated and transported on the lunar surface, as indicated by the transient dust clouds observed over the lunar horizon during the Apollo 17 mission. Theoretical models suggest that the dust grains on the lunar surface are charged by the solar UV radiation as well as the solar wind. Even without any physical activity, the dust grains are levitated by electrostatic fields and transported away from the surface in the near vacuum environment of the Moon. The current dust charging and levitation models, however, do not fully explain the observed phenomena. Since the abundance of dust on the Moon s surface with its observed adhesive characteristics has the potential of severe impact on human habitat and operations and lifetime of a variety of equipment, it is necessary to investigate the charging properties and the lunar dust phenomena in order to develop appropriate mitigating strategies. Photoelectric emission induced by the solar UV radiation with photon energies higher than the work function of the grain materials is recognized to be the dominant process for charging of the lunar dust, and requires measurements of the photoelectric yields to determine the charging and equilibrium potentials of individual dust grains. In this paper, we present the first laboratory measurements of the photoelectric efficiencies and yields of individual sub-micron/micron size dust grains selected from sample returns of Apollo 17, and Luna 24 missions, as well as similar size dust grains from the JSC-1 simulants. The measurements were made on a laboratory facility based on an electrodynamic balance that permits a variety of experiments to be conducted on individual sub-micron/micron size dust grains in simulated space environments. The photoelectric emission measurements indicate grain size dependence with the yield increasing by an order of magnitude for grains of sub-micron to several micron size radii, at which it reaches asymptotic values. The yield for large size grains is found to be more than an order of magnitude higher than the bulk measurements on lunar fines reported in the literature.
    Keywords: Lunar and Planetary Science and Exploration
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  • 74
    Publication Date: 2018-06-11
    Description: The contents include: 1) Experience Base; 2) Emergent Knowledge Processes; and 3) Lessons and Insights including flexibility and adaptability, embeddedness, measures of success, knowledge obsolescence, willingness to share and learning.
    Keywords: Computer Programming and Software
    Type: NASA Knowledge Management Workshop, Pasadena, California, July 18, 2007; Pasadena, CA; United States
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  • 75
    Publication Date: 2018-06-11
    Description: Optical astrometry of quasars and active galaxies can provide key information on the spatial distribution and variability of emission in compact nuclei. The Space Interferometry Mission (SIM PlanetQuest) will have the sensitivity to measure a significant number of quasar positions at the microarcsecond level. SIM will be very sensitive to astrometric shifts for objects as faint as V = 19. A variety of AGN phenomena are expected to be visible to SIM on these scales, including time and spectral dependence in position offsets between accretion disk and jet emission. These represent unique data on the spatial distribution and time dependence of quasar emission. It will also probe the use of quasar nuclei as fundamental astrometric references. Comparisons between the time-dependent optical photocenter position and VLBI radio images will provide further insight into the jet emission mechanism. Observations will be tailored to each specific target and science question. SIM will be able to distinguish spatially between jet and accretion disk emission; and it can observe the cores of galaxies potentially harboring binary supermassive black holes resulting from mergers.
    Keywords: Astrophysics
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  • 76
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    Publication Date: 2018-06-11
    Description: This report presents the results from the first task of the SARP Center Initiative, 'Product Line Verification of Safety-Critical Software.' Task 1 is a literature survey of available techniques for product line verification and validation. Section 1 of the report provides an introduction to product lines and motivates the survey of verification techniques. It describes what is reused in product-line engineering and explains the goal of verifiable conformance of the developed system to its product-line specifications. Section 2 of the report describes six lifecycle steps in product-line verification and validation. This description is based on, and refers to, the best practices extracted from the readings. It ends with a list of verification challenges for NASA product lines (2.7) and verification enablers for NASA product lines (2.8) derived from the survey. Section 3 provides resource lists of related conferences, workshops, industrial and defense industry experiences and case studies of product lines, and academic/industrial consortiums. Section 4 is a bibliography of papers and tutorials with annotated entries for relevant papers not previously discussed in sections 2 or 3.
    Keywords: Mathematical and Computer Sciences (General)
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  • 77
    Publication Date: 2018-06-11
    Description: The first five Titan flybys with Cassini's Synthetic Aperture RADAR (SAR) and radiometer are examined with emphasis on the calibration and interpretation of the high-resolution radiometry data acquired during the SAR mode (SAR-radiometry). Maps of the 2-cm wavelength brightness temperature are obtained coincident with the SAR swath imaging, with spatial resolution approaching 6 km. A preliminary calibration shows that brightness temperature in these maps varies from 64 to 89 K. Surface features and physical properties derived from the SAR-radiometry maps and SAR imaging are strongly correlated; in general, we find that surface features with high radar reflectivity are associated with radiometrically cold regions, while surface features with low radar reflectivity correlate with radiometrically warm regions. We examined scatterplots of the normalized radar cross-section sigma(exp o) versus brightness temperature, finding differing signatures that characterize various terrains and surface features. Implications for the physical and compositional properties of these features are discussed. The results indicate that volume scattering is important in many areas of Titan's surface, particularly Xanadu, while other areas exhibit complex brightness temperature variations consistent with variable slopes or surface material and compositional properties.
    Keywords: Communications and Radar
    Type: Icarus; Volume 191; No. 1; 211-222
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  • 78
    Publication Date: 2018-06-11
    Description: We present new models of the deuterium chemistry in protoplanetary disks, including, for the first time, multiply deuterated species. We use these models to explore whether observations in combination with models can give us clues as to which desorption processes occur in disks.We find, in common with other authors, that photodesorption can allow strongly bound molecules such as HDO to exist in the gas phase in a layer above the midplane. Models including this process give the best agreement with the observations. In the midplane, cosmic-ray heating can desorb weakly bound molecules such as CO and N2. We find the observations suggest that N2 is gaseous in this region, but that CO must be retained on the grains to account for the observed DCO+/HCO+. This could be achieved by CO having a higher binding energy than N2 (as may be the case when these molecules are accreted onto water ice) or by a smaller cosmic-ray desorption rate for CO than assumed here, as suggested by recent theoretical work. For gaseous molecules the calculated deuteration can be greatly changed by chemical processing in the disk from the input molecular cloud values. On the grains singly deuterated species tend to retain the D/H ratio set in the molecular cloud, whereas multiply deuterated species are more affected by the disk chemistry. Consequently, the D/H ratios observed in comets may be partly set in the parent cloud and partly in the disk, depending on the molecule.
    Keywords: Inorganic, Organic and Physical Chemistry
    Type: The Astrophysical Journal; Volume 660; 441-460
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  • 79
    Publication Date: 2018-06-11
    Description: We present validation studies of MLS version 2.2 upper tropospheric and stratospheric ozone profiles using ozonesonde and lidar data as well as climatological data. Ozone measurements from over 60 ozonesonde stations worldwide and three lidar stations are compared with coincident MLS data. The MLS ozone stratospheric data between 150 and 3 hPa agree well with ozonesonde measurements, within 8% for the global average. MLS values at 215 hPa are biased high compared to ozonesondes by approximately 20% at middle to high latitude, although there is a lot of variability in this altitude region.
    Keywords: Meteorology and Climatology
    Type: Journal Of Geophysical Research; Volume 112
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  • 80
    facet.materialart.
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    Publication Date: 2018-06-11
    Description: Multiyear estimates of sea ice drift in Baffin Bay and Davis Strait are derived for the first time from the 89 GHz channel of the AMSR-E instrument. Uncertainties in the drift estimates, assessed with Envisat ice motion, are approximately 2-3 km/day. A persistent atmospheric trough, between the coast of Greenland and Baffin Island, drives the prevailing southward drift pattern with average daily displacements in excess of 18-20 km during winter. Over the 5-year record, the ice export ranges between 360 and 675 x 10(exp 3) km(exp 2), with an average of 530 x 10(exp 3) km(exp 2). Sea ice area inflow from the Nares Strait, Lancaster Sound and Jones Sound potentially contribute up to a third of the net area outflow while ice production at the North Water Polynya contributes the balance. Rough estimates of annual volume export give approximately 500-800 km(exp 3). Comparatively, these are approximately 70% and approximately 30% of the annual area and Strait.
    Keywords: Meteorology and Climatology
    Type: Geophysical Research Letters (ISSN 0094-8276); Volume 34
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  • 81
    Publication Date: 2018-06-11
    Description: Vertical profiles of stratospheric HOCl calculated with a diurnal steady-state photochemical model that uses currently recommended reaction rates and photolysis cross sections underestimate observed profiles of HOCl obtained by two balloon-borne instruments, FIRS-2 (a far-infrared emission spectrometer) and MkIV (a mid-infrared, solar absorption spectrometer). Considerable uncertainty (a factor of two) persists in laboratory measurements of the rate constant (k(sub 1)) for the reaction ClO + HO2 yields HOCl + O2. Agreement between modeled and measured HOCl can be attained using a value of k(sub 1) from Stimpfle et al. (1979) that is about a factor-of-two faster than the currently recommended rate constant. Comparison of modeled and measured HOCl suggests that models using the currently recommended value for k(sub 1) may underestimate the role of the HOCl catalytic cycle for ozone depletion, important in the midlatitude lower stratosphere.
    Keywords: Meteorology and Climatology
    Type: Geophysical Research Letters (ISSN 0094-8276); Volume 34
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  • 82
    Publication Date: 2018-06-11
    Description: Measurement of precipitation Doppler velocity by spaceborne radar is complicated by the large velocity of the satellite platform. Even if successive pulses are well correlated, the velocity measurement may be biased if the precipitation target does not uniformly fill the radar footprint. It has been previously shown that the bias in such situations can be reduced if full spectral processing is used. The authors present a processor based on field-programmable gate array (FPGA) technology that can be used for spectral processing of data acquired by future spaceborne precipitation radars. The requirements for and design of the Doppler processor are addressed. Simulation and laboratory test results show that the processor can meet real-time constraints while easily fitting in a single FPGA.
    Keywords: Communications and Radar
    Type: Journal of Atmosphere and Oceanic Technology; Volume 24; Issue 10; 1811-1815
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  • 83
    Publication Date: 2018-06-11
    Description: SIM PlanetQuest (hereafter, just SIM) is a NASA mission to measure the angular positions of stars with unprecedented accuracy. We outline the main astrophysical science programs planned for SIM, and related opportunities for community participation. We focus especially on SIM's ability to detect exoplanets as small as the Earth around nearby stars. The planned synergy between SIM and other planet-finding missions including Kepler and GAIA, and planet-characterizing missions including the James Webb Space Telescope (JWST), Terrestrial Planet Finder--Coronagraph (TPF-C), and Terrestrial Planet Finder--Interferometer (TPF-I), is a key element in NASA's Navigator Program to find Earth-like planets, determine their habitability, and search for signs of life in the universe. SIM's technology development is now complete and the project is proceeding towards a launch in the next decade.
    Keywords: Astrophysics
    Type: Acta Astronautica; Volume 61; 52-62
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  • 84
    Publication Date: 2018-06-11
    Description: In this paper we address efficient conversion between a Gaussian beam (a truncated plane wave) and a truncated Bessel beam of agiven order, using cylindrical optical waveguides and whispering gallery mode resonators. Utilizing a generator based on waveguides combined with whispering gallery mode resonators, we have realized Bessel beams of the order of 200 with a conversion efficiency exceeding 10 %.
    Keywords: Optics
    Type: Optics Express; Volume 15; No. 9; 5866-5871
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  • 85
    Publication Date: 2018-06-11
    Description: The Martian ionosphere's local total electron content (TEC) and the neutral atmosphere scale height can be derived from radar echoes reflected from the surface of the planet. We report the global distribution of the TEC by analyzing more than 750,000 echoes of the Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS). This is the first direct measurement of the TEC of the Martian ionosphere. The technique used in this paper is a novel 'transmission-mode' sounding of the ionosphere of Mars in contrast to the Active Ionospheric Sounding experiment (AIS) on MARSIS, which generally operates in the reflection mode. This technique yields a global map of the TEC for the Martian ionosphere. The radar transmits a wideband chirp signal that travels through the ionosphere before and after being reflected from the surface. The received waves are attenuated, delayed and dispersed, depending on the electron density in the column directly below the spacecraft. In the process of correcting the radar signal, we are able to estimate the TEC and its global distribution with an unprecedented resolution of about 0.1 deg in latitude (5 km footprint). The mapping of the relative geographical variations in the estimated nightside TEC data reveals an intricate web of high electron density regions that correspond to regions where crustal magnetic field lines are connected to the solar wind. Our data demonstrates that these regions are generally but not exclusively associated with areas that have magnetic field lines perpendicular to the surface of Mars. As a result, the global TEC map provides a high-resolution view of where the Martian crustal magnetic field is connected to the solar wind. We also provide an estimate of the neutral atmospheric scale height near the ionospheric peak and observe temporal fluctuations in peak electron density related to solar activity.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Geophysical Research Letters; Volume 34; 2007
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  • 86
    Publication Date: 2018-06-11
    Description: An understanding of the effect of aerosols on biologically- and photochemically-active UV radiation reaching the Earth's surface is important for many ongoing climate, biophysical, and air pollution studies. In particular, estimates of the UV characteristics of the most common Australian aerosols will be valuable inputs to UV Index forecasts, air quality studies, and assessments of the impact of regional environmental changes. By analyzing climatological distributions of Australian aerosols we have identified sites where co-located ground-based UV-B and ozone measurements were available during episodes of relatively high aerosol activity. Since at least June 2003, surface UV global irradiance spectra (285-450 nm) have been measured routinely at Darwin and Alice Springs in Australia by the Australian Bureau of Meteorology (BoM). Using colocated sunphotometer measurements at Darwin and Alice Springs, we identified several episodes of relatively high aerosol activity. Aerosol air mass types were analyzed from sunphotometer-derived angstrom parameter, MODIS fire maps and MISR aerosol property retrievals. To assess aerosol effects we compared the measured UV irradiances for aerosol-loaded and clear-sky conditions with each other and with irradiances simulated using the libRadtran radiative transfer model for aerosol-free conditions. We found that for otherwise similar atmospheric conditions, smoke aerosols over Darwin reduced the surface UV irradiance by as much as 40-50% at 290-300 nm and 20-25% at 320-400 nm near active fires (aerosol optical depth, AOD, at 500 nm approximately equal to 0.6). Downwind of fires, the smoke aerosols over Darwin reduced the surface irradiance by 15-25% at 290-300 nm and approximately 10% at 320-350 nm (AOD at 500 nm approximately equal to 0.2). The effect of smoke increased with decrease of wavel strongest in the UV-B. The aerosol attenuation factors calculated for the selected cases suggest smoke over Darwin has an effect on surface 340-380 nm irradiances that is comparable to that produced by smoke over Sub-Saharan Africa. Dust activity was very low at Alice Springs during 2004, therefore we were not able to identify strong dust events to fully assess the UVeffect of dust. For the cases studied, smoke aerosols seem to produce a stronger reduction in surface UV irradiances than dust aerosols.
    Keywords: Meteorology and Climatology
    Type: Remote Sensing of Environment: Multi-angle Imaging SpectroRadiometer (MISR) Special Issue; Volume 107; Issues 1-2; 65-80
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  • 87
    Publication Date: 2018-06-11
    Description: We report on the design and performance of a novel broadband, biased, subharmonic 520-590 GHz fix-tuned frequency mixer that utilizes planar Schottky diodes. The suspended stripline circuit is fabricated on a GaAs membrane mounted in a split waveguide block. The chip is supported by thick beam leads that are also used to provide precise radio frequency (RF) grounding, RF coupling and dc/intermediate frequency connections. At room temperature, the mixer has a measured double sideband noise temperature of 3000 to 4000 K across the design band.
    Keywords: Electronics and Electrical Engineering
    Type: IEEE Microwave and Wireless Components Letters (ISSN 1531-1309); Volume 17; No. 12; 879-881
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  • 88
    Publication Date: 2018-06-11
    Description: The analysis of the response of the Earth Climate System to the seasonal changes of solar forcing in the tropical oceans using four years of the Atmospheric Infrared Sounder (AIRS) and Advanced Microwave Sounding Unit (AMSU) data between 2002 and 2006 gives new insight into amplitude and phase relationships between surface and tropospheric temperatures, humidity, and convective activity. The intensity of the convective activity is measured by counting deep convective clouds. The peaks of convective activity, temperature in the mid-troposphere, and water vapor in the 0-30 N and 0-30 S tropical ocean zonal means occur about two months after solstice, all leading the peak of the sea surface temperature by several weeks. Phase is key to the evaluation of feedback. The evaluation of climate models in terms of zonal and annual means and annual mean deviations from zonal means can now be supplemented by evaluating the phase of key atmospheric and surface parameters relative to solstice. The ability of climate models to reproduce the statistical flavor of the observed amplitudes and relative phases for broad zonal means should lead to increased confidence in the realism of their water vapor and cloud feedback algorithms. AIRS and AMSU were launched into a 705 km altitude polar sun-synchronous orbit on the EOS Aqua spacecraft on May 4, 2002, and have been in routine data gathering mode since September 2002.
    Keywords: Meteorology and Climatology
    Type: Geophysical Research Letters; Volume 34
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  • 89
    Publication Date: 2018-06-11
    Description: Iapetus has preserved evidence that constrains the modeling of its geophysical history from the time of its accretion until now. The evidence is (a) its present 79.33-day rotation or spin rate, (b) its shape that corresponds to the equilibrium figure for a hydrostatic body rotating with a period of approximately 16 h, and (c) its high, equatorial ridge, which is unique in the Solar System. This paper reports the results of an investigation into the coupling between Iapetus' thermal and orbital evolution for a wide range of conditions including the spatial distributions with time of composition, porosity, short-lived radioactive isotopes (SLRI), and temperature. The thermal model uses conductive heat transfer with temperature-dependent conductivity. Only models with a thick lithosphere and an interior viscosity in the range of about the water ice melting point can explain the observed shape. Short-lived radioactive isotopes provide the heat needed to decrease porosity in Iapetus? early history. This increases thermal conductivity and allows the development of the strong lithosphere that is required to preserve the 16-h rotational shape and the high vertical relief of the topography. Long-lived radioactive isotopes and SLRI raise internal temperatures high enough that significant tidal dissipation can start, and despin Iapetus to synchronous rotation. This occurred several hundred million years after Iapetus formed. The models also constrain the time when Iapetus formed because the successful models are critically dependent upon having just the right amount of heat added by SLRI decay in this early period. The amount of heat available from short-lived radioactivity is not a free parameter but is fixed by the time when Iapetus accreted, by the canonical concentration of Al-26, and, to a lesser extent, by the concentration of Fe-60. The needed amount of heat is available only if Iapetus accreted between 2.5 and 5.0Myr after the formation of the calcium aluminum inclusions as found in meteorites. Models with these features allow us to explain Iapetus? present synchronous rotation, its fossil 16-h shape, and the context within which the equatorial ridge arose.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Icarus; Volume 190; 179-202
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  • 90
    Publication Date: 2018-06-11
    Description: Recent studies have shown that the presence of elevated ducts in the lower atmosphere has an adverse effect on the inversion of GPS radio occultation data. The problem arises because the microwave refractivity within and below an elevated duct is no longer uniquely determined by the bending angle profile. Applying Abel inversion without a priori knowledge of the duct will introduce a negative bias in the retrieved refractivity profile within and below the duct. In this work, high vertical resolution radiosonde data are used to give a quantitative assessment of the characteristics and effects of ducts, including their frequency of occurrences, heights, and thicknesses at different latitudes and seasons. The negative bias from the Abel-retrieved refractivity profiles resulting from these ducts is also computed. The results give a strong indication that ducting in the lower troposphere is a frequent phenomenon over the tropics and midlatitudes. The ducts are shown to be predominantly caused by sharp changes in the vertical structure of water vapor. The majority of the ducts are found to be below 2 km, with a median duct layer thickness of about 100 m. The negative refractivity bias is shown to be largest below 2 km, with a median value of about 0.5-1% in the tropics and 0.2-0.5% in midlatitudes. The bias is about a factor of 2-3 smaller between 2 to 3 km and is negligible above 4 km.
    Keywords: Earth Resources and Remote Sensing
    Type: Radio Science; Volume 42
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  • 91
    Publication Date: 2018-06-11
    Description: Evolution has resolved many of nature's challenges leading to working and lasting solutions that employ principles of physics, chemistry, mechanical engineering, materials science, and many other fields of science and engineering. Nature's inventions have always inspired human achievements leading to effective materials, structures, tools, mechanisms, processes, algorithms, methods, systems, and many other benefits. Some of the technologies that have emerged include artificial intelligence, artificial vision, and artificial muscles, where the latter is the moniker for electroactive polymers (EAPs). To take advantage of these materials and make them practical actuators, efforts are made worldwide to develop capabilities that are critical to the field infrastructure. Researchers are developing analytical model and comprehensive understanding of EAP materials response mechanism as well as effective processing and characterization techniques. The field is still in its emerging state and robust materials are still not readily available; however, in recent years, significant progress has been made and commercial products have already started to appear. In the current paper, the state-of-the-art and challenges to artificial muscles as well as their potential application to biomimetic mechanisms and devices are described and discussed.
    Keywords: Cybernetics, Artificial Intelligence and Robotics
    Type: Proceedings of the Institution of Mechanical Engineers Part C-Journal of Mechanical Engineering Science; Volume 221; Issue 10; 1149-1156
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  • 92
    Publication Date: 2018-06-11
    Description: Optical interferometry will open new vistas for astronomy over the next decade. The Space Interferometry Mission (SIM-PlanetQuest), operating unfettered by the Earth's atmosphere, will offer unprecedented astrometric precision that promises the discovery of Earth-analog extra-solar planets as well as a wealth of important astrophysics. Results from SIM will permit the determination of stellar masses to accuracies of 2% or better for objects ranging from brown dwarfs through main sequence stars to evolved white dwarfs, neutron stars, and black holes. Studies of star clusters will yield age determinations and internal dynamics. Microlensing measurements will present the mass spectrum of the Milky Way internal to the Sun while proper motion surveys will show the Sun's orbital radius and speed. Studies of the Galaxy's halo component and companion dwarf galaxies permit the determination of the Milky Way's mass distribution, including its Dark Matter component and the mass distribution and Dark Matter component of the Local Group. Cosmology benefits from precision (1-2%) determination of distances to Cepheid and RR Lyrae standard candles. The emission mechanism of supermassive black holes will be investigated. Finally, radio and optical celestial reference frames will be tied together by an improvement of two orders of magnitude. Optical interferometers present severe technological challenges. The Jet Propulsion Laboratory, with the support of Lockheed Martin Advanced Technology Center (LM ATC) and Northrop Grumman Space Technology (NGST), has addressed these challenges with a technology development program that is now complete. The requirements for SIM have been satisfied, based on outside peer review, using a series of laboratory tests and appropriate computer simulations: laser metrology systems perform with 10 picometer precision; mechanical vibrations have been controlled to nanometers, demonstrating orders of magnitude disturbance rejection; and knowledge of component positions throughout the whole test assembly has been demonstrated to the required picometer level. Technology transfer to the SIM flight team is now well along.
    Keywords: Astronomy
    Type: Proceedings, SPIE; Volume 6693
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  • 93
    Publication Date: 2018-06-11
    Description: We present the design of a compact, wide-angle pushbroom imaging spectrometer suitable for exploration of solar system bodies from low orbit. The spectrometer is based on a single detector array with a broadband response that covers the range 400 to 3000 nm and provides a spectral sampling of 10 nm. The telescope has a 24-deg field of view with 600 spatially resolved elements (detector pixels). A specially designed convex diffraction grating permits optimization of the signal-to-noise ratio through the entire spectral band. Tolerances and design parameters permit the achievement of high uniformity of response through field and wavelength. The spectrometer performance is evaluated in terms of predicted spectral and spatial response functions and from the point of view of minimizing their variation through field and wavelength. The design serves as an example for illustrating the design principles specific to this type of system.
    Keywords: Instrumentation and Photography
    Type: Optical Engineering; Volume 46; No. 6
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  • 94
    Publication Date: 2018-06-11
    Description: We present a design for a cryogenically cooled large aperture telescope for far-infrared astronomy in the wavelength range 30 micrometers to 300 micrometers. The Cryogenic Aperture Large Infrared Space Telescope Observatory, or CALISTO, is based on an off-axis Gregorian telescope having a 4 m by 6 m primary reflector. This can be launched using an Atlas V 511, with the only optical deployment required being a simple hinged rotation of the secondary reflector. The off-axis design, which includes a cold stop, offers exceptionally good performance in terms of high efficiency and minimum coupling of radiation incident from angles far off the direction of maximum response. This means that strong astronomical sources, such as the Milky Way and zodiacal dust in the plane of the solar system, add very little to the background. The entire optical system is cooled to 4 K to make its emission less than even this low level of astronomical emission. Assuming that detector technology can be improved to the point where detector noise is less than that of the astronomical background, we anticipate unprecedented low values of system noise equivalent power, in the vicinity of 10(exp -19) WHz(exp -0.5), through CALISTO's operating range. This will enable a variety of new astronomical investigations ranging from studies of objects in the outer solar system to tracing the evolution of galaxies in the universe throughout cosmic time.
    Keywords: Optics
    Type: Proceedings of the SPIE; Volume 6687
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  • 95
    Publication Date: 2018-06-11
    Description: We have updated the orbits of the small inner Saturnian satellites using additional Cassini imaging observations through 2007 March. Statistically significant changes from previously published values appear in the eccentricities and inclinations of Pan and Daphnis, but only small changes have been found in the estimated orbits of the other satellites. We have also improved our knowledge of the masses of Janus and Epimetheus as a result of their close encounter observed in early 2006.
    Keywords: Astrophysics
    Type: The Astronomical Journal; Volume 135; 261
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  • 96
    Publication Date: 2018-06-11
    Description: Many years of high-resolution measurements by a number of space-based sensors and from Lagrangian drifters became available recently and are used to examine the persistent atmospheric imprints of the semi-permanent meanders of the Agulhas Extension Current (AEC), where strong surface current and temperature gradients are found. The sea surface temperature (SST) measured by the Advanced Microwave Scanning Radiometer-Earth Observing System (AMSR-E) and the chlorophyll concentration measured by the Sea-viewing Wide Field-of-view Sensor (SeaWiFS) support the identification of the meanders and related ocean circulation by the drifters. The collocation of high and low magnitudes of equivalent neutral wind (ENW) measured by Quick Scatterometer (QuikSCAT), which is uniquely related to surface stress by definition, illustrates not only the stability dependence of turbulent mixing but also the unique stress measuring capability of the scatterometer. The observed rotation of ENW in opposition to the rotation of the surface current clearly demonstrates that the scatterometer measures stress rather than winds. The clear differences between the distributions of wind and stress and the possible inadequacy of turbulent parameterization affirm the need of surface stress vector measurements, which were not available before the scatterometers. The opposite sign of the stress vorticity to current vorticity implies that the atmosphere spins down the current rotation through momentum transport. Coincident high SST and ENW over the southern extension of the meander enhance evaporation and latent heat flux, which cools the ocean. The atmosphere is found to provide negative feedback to ocean current and temperature gradients. Distribution of ENW convergence implies ascending motion on the downwind side of local SST maxima and descending air on the upwind side and acceleration of surface wind stress over warm water (deceleration over cool water); the convection may escalate the contrast of ENW over warm and cool water set up by the dependence of turbulent mixing on stability; this relation exerts a positive feedback to the ENW-SST relation. The temperature sounding measured by the Atmospheric Infrared Sounder(AIRS) is consistent with the spatial coherence between the cloud-top temperature provided by the International Satellite Cloud Climatology Project (ISCCP) and SST. Thus ocean mesoscale SST anomalies associated with the persistent meanders may have a long-term effect well above the midlatitude atmospheric boundary layer, an observation not addressed in the past.
    Keywords: Oceanography
    Type: Journal of Climate; Volume 20; Issue 23
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  • 97
    Publication Date: 2018-06-11
    Description: Arecibo delay-Doppler measurements of (99942) Apophis in 2005 and 2006 resulted in a five standard-deviation trajectory correction to the optically predicted close approach distance to Earth in 2029. The radar measurements reduced the volume of the statistical uncertainty region entering the encounter to 7.3% of the pre-radar solution, but increased the trajectory uncertainty growth rate across the encounter by 800% due to the closer predicted approach to the Earth. A small estimated Earth impact probability remained for 2036. With standard-deviation plane-of-sky position uncertainties for 2007-2010 already less than 0.2 arcsec, the best near-term ground-based optical astrometry can only weakly affect the trajectory estimate. While the potential for impact in 2036 will likely be excluded in 2013 (if not 2011) using ground-based optical measurements, approximations within the Standard Dynamical Model (SDM) used to estimate and predict the trajectory from the current era are sufficient to obscure the difference between a predicted impact and a miss in 2036 by altering the dynamics leading into the 2029 encounter. Normal impact probability assessments based on the SDM become problematic without knowledge of the object's physical properties; impact could be excluded while the actual dynamics still permit it. Calibrated position uncertainty intervals are developed to compensate for this by characterizing the minimum and maximum effect of physical parameters on the trajectory. Uncertainty in accelerations related to solar radiation can cause between 82 and 4720 Earth-radii of trajectory change relative to the SDM by 2036. If an actionable hazard exists, alteration by 2-10% of Apophis' total absorption of solar radiation in 2018 could be sufficient to produce a six standard-deviation trajectory change by 2036 given physical characterization; even a 0.5% change could produce a trajectory shift of one Earth-radius by 2036 for all possible spin-poles and likely masses. Planetary ephemeris uncertainties are the next greatest source of systematic error, causing up to 23 Earth-radii of uncertainty. The SDM Earth point-mass assumption introduces an additional 2.9 Earth-radii of prediction error by 2036. Unmodeled asteroid perturbations produce as much as 2.3 Earth-radii of error. We find no future small-body encounters likely to yield an Apophis mass determination prior to 2029. However, asteroid (144898) 2004 VD17, itself having a statistical Earth impact in 2102, will probably encounter Apophis at 6.7 lunar distances in 2034, their uncertainty regions coming as close as 1.6 lunar distances near the center of both SDM probability distributions.
    Keywords: Space Sciences (General)
    Type: Icarus; Volume 193; Issue 1; 1-19
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  • 98
    Publication Date: 2018-06-11
    Description: The National Aeronautics and Space Administration has developed a capacity approaching modulation and coding scheme that comprises a serial concatenation of an inner accumulate pulse-position modulation (PPM) and an outer convolutional code [or serially concatenated PPM (SCPPM)] for deep-space optical communications. Decoding of this code uses the turbo principle. However, due to the nonbinary property of SCPPM, a straightforward application of classical turbo decoding is very inefficient. Here, we present various optimizations applicable in hardware implementation of the SCPPM decoder. More specifically, we feature a Super Gamma computation to efficiently handle parallel trellis edges, a pipeline-friendly 'maxstar top-2' circuit that reduces the max-only approximation penalty, a low-latency cyclic redundancy check circuit for window-based decoders, and a high-speed algorithmic polynomial interleaver that leads to memory savings. Using the featured optimizations, we implement a 6.72 megabits-per-second (Mbps) SCPPM decoder on a single field-programmable gate array (FPGA). Compared to the current data rate of 256 kilobits per second from Mars, the SCPPM coded scheme represents a throughput increase of more than twenty-six fold. Extension to a 50-Mbps decoder on a board with multiple FPGAs follows naturally. We show through hardware simulations that the SCPPM coded system can operate within 1 dB of the Shannon capacity at nominal operating conditions.
    Keywords: Space Communications, Spacecraft Communications, Command and Tracking
    Type: IEEE Transactions On Circuits and Systems--I: Regular Papers; Volume 55; No. 2; 644-658
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  • 99
    Publication Date: 2018-06-11
    Description: With a dynamic atmosphere and a large supply of particulate material, the surface of Mars is heavily influenced by wind-driven, or aeolian, processes. The High Resolution Imaging Science Experiment (HiRISE) camera on the Mars Reconnaissance Orbiter (MRO) provides a new view of Martian geology, with the ability to see decimeter-size features. Current sand movement, and evidence for recent bedform development, is observed. Dunes and ripples generally exhibit complex surfaces down to the limits of resolution. Yardangs have diverse textures, with some being massive at HiRISE scale, others having horizontal and cross-cutting layers of variable character, and some exhibiting blocky and polygonal morphologies. 'Reticulate' (fine polygonal texture) bedforms are ubiquitous in the thick mantle at the highest elevations.
    Keywords: Instrumentation and Photography
    Type: Geophysical Research Letters; Volume 34
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  • 100
    Publication Date: 2018-06-11
    Description: This paper presents an approach for slip prediction from a distance for wheeled ground robots using visual information as input. Large amounts of slippage which can occur on certain surfaces, such as sandy slopes, will negatively affect rover mobility. Therefore, obtaining information about slip before entering such terrain can be very useful for better planning and avoiding these areas. To address this problem, terrain appearance and geometry information about map cells are correlated to the slip measured by the rover while traversing each cell. This relationship is learned from previous experience, so slip can be predicted remotely from visual information only. The proposed method consists of terrain type recognition and nonlinear regression modeling. The method has been implemented and tested offline on several off-road terrains including: soil, sand, gravel, and woodchips. The final slip prediction error is about 20%. The system is intended for improved navigation on steep slopes and rough terrain for Mars rovers.
    Keywords: Geophysics
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