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  • Other Sources  (18,699)
  • 2015-2019  (18,527)
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  • 2016  (10,004)
  • 1926  (172)
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  • 2015-2019  (18,527)
  • 1980-1984
  • 1960-1964
  • 1925-1929  (172)
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  • 1
    Publication Date: 2020-02-06
    Description: Anaerobic oxidation of methane (AOM) was shown to reduce methane emissions by over 50% in freshwater systems, its main natural contributor to the atmosphere. In these environments iron oxides can become main agents for AOM, but the underlying mechanism for this process has remained enigmatic. By conducting anoxic slurry incubations with lake sediments amended with 13C-labeled methane and naturally abundant iron oxides the process was evidenced by significant 13C-enrichment of the dissolved inorganic carbon pool and most pronounced when poorly reactive iron minerals such as magnetite and hematite were applied. Methane incorporation into biomass was apparent by strong uptake of 13C into fatty acids indicative of methanotrophic bacteria, associated with increasing copy numbers of the functional methane monooxygenase pmoA gene. Archaea were not directly involved in füll methane oxidation, but their crucial participation,likely being mediators in electron transfer, was indicated by specific inhibition of their activity that fully stopped iron-coupled AOM. By contrast, inhibition of sulfur cycling increased 13C-methane turnover, pointing to sulfur species involvement in a competing process. Our findings suggest that the mechanism of iron-coupled AOM is accomplished by a complex microbemineral reaction network, being likely representative of many similar but hidden interactions sustaining life under highly reducing low energy conditions.
    Type: Article , PeerReviewed
    Format: text
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  • 2
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    In:  Physikalische Zeitschrift, Jena, Gustav Fischer, vol. 27, no. 3, pp. 84-86, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Publication Date: 1926
    Keywords: Meteorology ; Acoustics
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  • 3
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    In:  Zeitschrift für Geophysik, Jena, Gustav Fischer, vol. 2, no. 3, pp. 24-29, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Publication Date: 1926
    Keywords: Earth model, also for more shallow analyses ! ; Seismology
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  • 4
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    In:  Zeitschrift für Geophysik, Jena, Gustav Fischer, vol. 2, no. 3, pp. 260-266, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Publication Date: 1926
    Keywords: Waves ; Acoustics
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  • 5
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    In:  Die Naturwissenschaften, Jena, Gustav Fischer, vol. 14, no. 3, pp. 338-342, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Publication Date: 1926
    Keywords: Waves ; Meteorology ; Acoustics
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  • 6
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    In:  Meteorologische Zeitschrift, Jena, Gustav Fischer, vol. 43, no. 3, pp. 427-430, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Publication Date: 1926
    Keywords: Earth model, also for more shallow analyses ! ; Meteorology
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  • 7
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    In:  Gerlands Beiträge zur Geophysik, Jena, Gustav Fischer, vol. 15, no. 3, pp. 51-63, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Publication Date: 1926
    Keywords: Seismology ; Seismicity
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  • 8
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    Bornträger
    In:  Professional Paper, Lehrbuch der Geophysik, Berlin, 6 + 1017 pp., Bornträger, vol. 3, no. VIIa, pp. 354-377, (ISBN: 3-540-23712-7)
    Publication Date: 1926
    Keywords: (The Earth's free) oscillations ; Chandler wobble
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  • 9
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    Bornträger
    In:  Professional Paper, Lehrbuch der Geophysik, Berlin, 6 + 1017 pp., Bornträger, vol. 3, no. VIIa, pp. 612-617, (ISBN: 3-540-23712-7)
    Publication Date: 1926
    Keywords: Applied geophysics ; Seismology ; Seismics (controlled source seismology)
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  • 10
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    Bornträger
    In:  Professional Paper, Lehrbuch der Geophysik, Berlin, 6 + 1017 pp., Bornträger, vol. 3, no. VIIa, pp. 434-499, (ISBN: 3-540-23712-7)
    Publication Date: 1926
    Keywords: Seismology ; Earth model, also for more shallow analyses !
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  • 11
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    In:  Zeitschrift für Physik, Leipzig, Birkhäuser Verlag, vol. 38, no. 5, pp. 803, pp. L15S17, (ISBN: 0-12-018847-3)
    Publication Date: 1926
    Keywords: physics ; Scattering ; Waves ; quantum ; mechanics
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  • 12
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    In:  Natur und Museum, Jena, Gustav Fischer, vol. 56, no. 3, pp. 33-41, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Publication Date: 1926
    Keywords: Handbook of geophysics ; Earth model, also for more shallow analyses !
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  • 13
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    In:  Physikalische Zeitschrift, Jena, Gustav Fischer, vol. 27, no. 3, pp. 111-114, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Publication Date: 1926
    Keywords: Seismology ; Group veloc.
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  • 14
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    In:  Zeitschrift für Geophysik, Jena, Gustav Fischer, vol. 2, no. 3, pp. 101-106, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Publication Date: 1926
    Keywords: Meteorology ; Acoustics
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  • 15
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    In:  Zeitschrift für Geophysik, Jena, Gustav Fischer, vol. 2, no. 3, pp. 305-309, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Publication Date: 1926
    Keywords: Travel time ; Seismology
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  • 16
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    In:  Die Umschau, Jena, Gustav Fischer, vol. 30, no. 3, pp. 265-268, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Publication Date: 1926
    Keywords: Earth model, also for more shallow analyses ! ; Velocity depth profile
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  • 17
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    Bornträger
    In:  Berlin, 6 + 1017 pp., Bornträger, vol. 3, no. Subvol. b, pp. 220, (ISBN 0-12-305355-2)
    Publication Date: 1926
    Keywords: Textbook of geophysics ; Seismology
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  • 18
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    Bornträger
    In:  Professional Paper, Lehrbuch der Geophysik, Berlin, 6 + 1017 pp., Bornträger, vol. 3, no. VIIa, pp. 966-993, (ISBN: 3-540-23712-7)
    Publication Date: 1926
    Keywords: Review article
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  • 19
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    Bornträger
    In:  Professional Paper, Lehrbuch der Geophysik, Berlin, 6 + 1017 pp., Bornträger, vol. 3, no. VIIa, pp. 1-3, (ISBN: 3-540-23712-7)
    Publication Date: 1926
    Keywords: Textbook of geophysics
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  • 20
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    In:  Landwirtschaftl. Jahrbuch 64:241-296
    Publication Date: 1926
    Description: Zusammenhang zwischen Niederschlag, Temperatur und Erträgen. Untersucht wurden Winterweizen, Winterroggen, Sommergerste, Sommerroggen, Kartoffeln, Futterpflanzen und Wiesen KATASTER-BESCHREIBUNG: Einfluss der Witterungsfaktoren Niederschlag und Temperatur auf die Ernteerträge KATASTER-DETAIL: Delta Nied +, dann Erträge (Halmfrüchte und Kartoffeln) + und später -; Delta T -, dann Erträge +,
    Keywords: Deutsches Reich (östl. u. westl. Provinzen, Hannover, Sachsen, Rheinland) ; 1899-1913 ; Ertrag ; Getreide ; Rangordnungsmethode ; Witterung ; Hackfrüchte
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  • 21
    Publication Date: 1926
    Description: Abhängigkeit der Getreideerträge von Witterungseinflüssen mithilfe der Korrelationsmethode in 11 orographisch abgegrenzen Gebieten KATASTER-BESCHREIBUNG: Korrelation zwischen der Abweichung vom 11, bzw. 30jährigen monatlichen Mittel (April-Juli) der Niederschläge und dem Ertrag von Getreidearten (Weizen, Dinkel, Roggen, Gerste, Hafer) KATASTER-DETAIL: Nied 〉 (11, bzw. 30jährigen monatlichen Mittel von 1888-1898 und 1888-1917 im Monat Mai, je nach Region 55-158mm), dann höchste Übereinstimmung der Korrelationskoeffienten für die Ertragszunahme über alle Kulturen
    Keywords: Baden ; 1888-1898 und 1888-1917 ; Ertrag ; Getreide ; Korrelationsmethode ; Niederschlag ; Temperatur ; Witterung
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  • 22
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    In:  Illustr. Landw. Zeitg. 46; p.225-226
    Publication Date: 1926
    Description: Zusammenfassung des Entwicklungszyklus und der Lebensweise des Maiszünslers, sowie seiner Verschleppung in verschiedene Teile der Welt. Zudem werden einige Angaben zu Ertragsverlusten durch Maiszünsler-Befall in Deutschland und den USA gemacht. Der Zeitraum bezeichnet die Angaben über das Erstauftreten in verschiedenen Ländern. KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Deutschland, Europa, Welt ; 1903-1921 ; Mais ; Pflanzenschädling
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  • 23
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    In:  Landw. Wochenschr. Prov. Sachsen u. Anhalt 28; p.556-557
    Publication Date: 1926
    Description: Der Autor nennt die in diesem Jahre auffällig gewordenen Pflanzenkrankheiten bzw. -schädlinge (z.B. Weißährigkeit, Gelbrost, Streifenkrankheit) an verschiedenen Kulturpflanzen (hauptsächlich im Ackerbau) und bringt diese mit klimatischen und nicht-klimatischen Faktoren in Zusammenhang. Vor allem wird die ausserordentliche Feuchte des ersten Halbjahres als Ursache genannt. KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Sachsen, Sachsen-Anhalt ; 1926 ; Pflanzenkrankheit
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  • 24
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    In:  Sonderabdr. Mitt. Naturf. Ges. Bern 81; 2p.
    Publication Date: 1926
    Description: Der Autor beschreibt den Fortschritt eigener Laborversuche zum Einfluß der Luftfeuchtigkeit auf die Perithecienbildung des Mehltaupilzes Erysiphe cichoraceum D.C. KATASTER-BESCHREIBUNG: hohe Luftfeuchtigkeit begünstigt die Keimung der Konidien und den Befall; Trockenes Wetter begünstigt die weitere Entwicklung des Mehltaus KATASTER-DETAIL:
    Keywords: Labor ; 1926 ; Pflanzenkrankheit
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  • 25
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    In:  U.S. Mo. Weather Rev. 54; 13-14
    Publication Date: 1926
    Description: Diese Studie gibt eine niedrige positive Korrelation zwischen Sonnenscheindauer und Baumwachstum an. Die Beziehung ist bei weitem nicht so stark wie viele Autoren sagen. KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
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  • 26
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    In:  Met. Ztschr. 43: 161-172
    Publication Date: 1926
    Description: Aufarbeitung des Verlaufs der Temperatur und des Wachstums von verschiedenen wilden und kultivierten Bäumen und anderen Pflanzen an wilden, abgelegenen Orten KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Nord- und Mitteleuropa ; letzten100 Jahre ; Botanik ; Forst ; Klima ; Temperatur ; Wachstum
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  • 27
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    In:  Landwirtschaftl. Jahrbuch (64)817-930.
    Publication Date: 1926
    Description: Zusammenhang Klima, Witterung und Ertrag von Gräsern und Klee KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Deutschland ; Boden ; Ertrag ; Klima ; Landwirtschaft
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  • 28
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    In:  Met. Zeitschr. 43:352-355.
    Publication Date: 1926
    Description: Einfluss von Temperatur und Niederschlag auf die Vegetation KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Deutschland ; 1900-1925 ; Klima ; Niederschlag ; Temperatur
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  • 29
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    In:  Landwirtschaftl. Jahrbuch 63:437.
    Publication Date: 1926
    Description: Bezeihung zwischen Witterung und Ertrag vieler Kulturen eingeteilt nach Monaten KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Göttingen ; 1901-22
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  • 30
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    In:  Hess. Landw. Zeitschr. 96, p.346
    Publication Date: 1926
    Description: Der Autor äußert die Vermutung, daß strenge Winter den Rostbefall vermindern und erwähnt das starke Befallsjahr 1926. Er klagt über ein noch zu geringes Wissen über die beeinflussenden Klimafaktoren. KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Wetterau, Hessen ; 1926 ; Getreide ; Pflanzenkrankheit
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  • 31
    Publication Date: 1926
    Description: Diskussion über die Geschichte, Entwicklung und Anwendbarkeit von phänologischen Studien, Zusammenfassung, teilweise Details über den Einfluss der Sorte, der Düngung, des Bodens, Klimas, Längengrades, Krankheiten und anderer Faktoren auf die Erträge von Winterroggen in Bayern KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Bayern ; 1917-1923 ; Botanik ; Ertrag ; Klima ; Niederschlag ; Pflanzenschädling ; Phänologie ; Roggen ; Düngung ; Frost
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  • 32
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    In:  Nachrichtenblatt für den deutschen Pflanzenschutzdienst, Jahrgang 6, Nr. 4, p. 27
    Publication Date: 1926
    Description: Beobachtungen zum Auftreten der gelben Halmfliege in Schleswig-Holstein und deren Auswirkungen auf bestimmte Getreidearten (Sommerweizen und Sommergerste) KATASTER-BESCHREIBUNG: Einfluss der Witterung auf das Auftreten der Fliege KATASTER-DETAIL: Delta Nied +, dann Sommerflug -
    Keywords: Schleswig-Holstein ; 1926 ; Insekten ; Anbautermine ; Getreide ; Landwirtschaft ; Niederschlag ; Pflanzenschädling ; Weizen ; Gerste
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  • 33
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    In:  Die Kartoffel, S. 66
    Publication Date: 1926
    Description: Zusammenhang zwischen der Witterung und der Stärkeeinlagerung bei Kartoffeln KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Kartoffeln ; Ertrag ; Witterung
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  • 34
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    In:  Jllustr. Landw. Zeitg. 46; p.551-552
    Publication Date: 1926
    Description: Schilderung des Rostbefalls (insbesondere Gelbrost)in der Region Kassel im Jahre 1926. Der Autor beklagt das bisher fehlende Wissen der Wissenschaftler und präsentiert eine Umfrage unter Landwirten zu den Einflußfaktoren (u.a. klimatische) auf den Rostbefall. Zudem werden Vorbeugungsmaßnahmen vorgestellt. KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Kassel ; 1926 ; Getreide ; Pflanzenkrankheit ; Weizen
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  • 35
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    In:  Prakt. Blätter. Bayer. Landesanst. Pflanzenbau und Schutz 4 (5): 103-111
    Publication Date: 1926
    Description: Beobachtungen zu den Auswirkungen der Witterung im Jahr 1926 auf Getreide, Futterpflanzen und Kartoffeln sowie ihrer Schädigungen durch verschiedene Schaderreger, wie z.B. Roste, Fusarien, Phytophthora, etc. KATASTER-BESCHREIBUNG: Einfluss der Witterung (Temperatur, Niederschlag, Sonnenschein) auf den Ertrag KATASTER-DETAIL: Delta T (Februar) +, dann Auswinterungsschäden +; Delta T (März, April) + und Delta Nied (März) +, dann Entwicklung + (früher); Delta T (Mai, Juni) -: T 〈 0 °C (Frost), dann Kälteschäden +; Delta Sonn (Juni, Juli) -, dann Entwicklung -; Delta T (Frühjahr) +, dann Ertrag (Wintergetreide - außer Winterroggen) +; Delta T (Mai) - : T 〈 0 °C, dann Wachstum (Winterweizen) - und Auftreten von Gelbrost +, dadurch Ertrag (Winterweizen) -; Delta T(Frühjahr) +, dann Saat + (früher) und Entwicklung +, dadurch Ertrag (Sommergetreide) +; Delta Nied (Sommer) +, dann Entwicklung (Rüben) +; Delta Nied (Sommer) + und Delta T (Sommer) -, dann Entwicklung (Pferdebohnen) -; Delta Nied (Sommer) + und Delta T (Sommer) -, dann Entwicklung (Kartoffeln) -;
    Keywords: Bayern ; 1926 ; Kartoffeln ; Getreide ; Pflanzenkrankheit ; Pflanzenschädling ; Hackfrüchte
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  • 36
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    In:  Der Kulturtechniker 29: 191-202
    Publication Date: 1926
    Description: Beschreibung der Niederschläge von 66 Stationen während der Vegetationszeit (April-September), Bestimmung der Dürremonate im Rahmen der vom Deutschen Ausschuß für Kulturbauwesen in Auftrag gegebene Untersuchungen auch für alle anderen Regionen Deutschlands KATASTER-BESCHREIBUNG: Wahrscheinlichste Häufigkeit von nassen Monaten an der Küste und im Südwesten Preußens am geringsten, größte Häufikeit von hintereinanderfolgenden Dürremonaten im Küstenland mit Niederschlägen 〈 50mm pro Monat KATASTER-DETAIL:
    Keywords: Ostpreußen ; 1886-1925 ; Klima ; Landwirtschaft ; Niederschlag ; Trockenheit
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  • 37
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    In:  Métérologie 2: 412-414
    Publication Date: 1926
    Description: Diskussion über den Zusammenhang von Niederschlag, Temperatur und Ertrag KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Frankreich ; 1900-1925 ; Ertrag ; Landwirtschaft ; Niederschlag ; Temperatur
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  • 38
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    In:  Zeitschrift für Pflanzenernährung, Düngung, Bodenkunde 16.
    Publication Date: 1926
    Description: Beziehungen zwischen Witterung und Ernteertrag KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Hohenheim (Baden-Württemberg) ; 1914-25 ; Ertrag ; Witterung
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  • 39
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    In:  Landw. Jahrbuch Berlin 63(1):1-81
    Publication Date: 1926
    Description: Auszug aus der Diss. KATASTER-BESCHREIBUNG: Beziehungen zwischen Witterung (Temperatur und Niederschlag)und Ernte KATASTER-DETAIL:
    Keywords: Göttingen ; 1901-1922 ; Ertrag ; Korrelationsmethode ; Niederschlag ; Temperatur ; Witterung ; Hackfrüchte ; Erbsen
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  • 40
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    In:  Zeitschrift für Acker- und Pflanzenbau 3:330-334.
    Publication Date: 1926
    Description: Angabe von Niederschlagsmengen und Durchschnittstemperaturen für das ökologische Optimum bestimmter Sorten, kritische Zeiten (vor und nach der Blüte) sind hierfür entscheidend KATASTER-BESCHREIBUNG: Einfluss von Wasser und Wärme, bzw. Niederschlag und Temperatur auf den Ertrag KATASTER-DETAIL: Roggen, Weizen: Delta Nied (Beginn Blütezeit)-, dann Ertrag +; Hafer, Gerste, Kartoffel: Delta T (Beginn der Blüte) -, dann Ertrag +; Bohne: Delta T (gesamte Wachstumszeit)+ und Delta Nied (gesamte Wachstumszeit) +, dann Ertrag +
    Keywords: Göttingen ; 1901-22 ; Kartoffeln ; Ertrag ; Getreide ; Hafer ; Klima ; Korrelationsmethode ; Niederschlag ; Roggen ; Temperatur ; Weizen ; Witterung ; Hackfrüchte ; Erbsen
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  • 41
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    In:  Nassauer Land 108, p. 185
    Publication Date: 1926
    Description: Beobachtungen zum Gelbrostbefall von Weizen, Roggen und Gerste KATASTER-BESCHREIBUNG: - KATASTER-DETAIL: -
    Keywords: Deutschland ; 1926 ; Infektionskrankheiten ; Getreide ; Pflanzenkrankheit ; Roggen ; Weizen ; Gerste
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  • 42
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    In:  In: Chemie der Erde, Jena
    Publication Date: 1926
    Description: Beziehung zwischen Klima, Boden und Ertragsfähigkeit allgemein KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Europa ; letzten 2000 Jahre ; Boden ; Ertrag ; Forst ; Klima
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  • 43
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    Bornträger
    In:  Professional Paper, Lehrbuch der Geophysik, Berlin, 6 + 1017 pp., Bornträger, vol. 3, no. VIIa, pp. 582-611, (ISBN: 3-540-23712-7)
    Publication Date: 1926
    Keywords: Seismology ; Deep seismic sounding (espec. cont. crust) ; Seismics (controlled source seismology)
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  • 44
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    Bornträger
    In:  Professional Paper, Lehrbuch der Geophysik, Berlin, 6 + 1017 pp., Bornträger, vol. 3, no. VIIa, pp. 308-353, (ISBN: 3-540-23712-7)
    Publication Date: 1926
    Keywords: Waves ; TIDES
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  • 45
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    Bornträger
    In:  Professional Paper, Lehrbuch der Geophysik, Berlin, 6 + 1017 pp., Bornträger, vol. 3, no. VIIa, pp. 220-307, (ISBN: 3-540-23712-7)
    Publication Date: 1926
    Keywords: Source ; Seismology
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  • 46
    Publication Date: 2016-11-16
    Description: No abstract available
    Keywords: Space Transportation and Safety
    Type: M17-5606 , Tri-Lateral Operational Safety Technical Interchange Meeting (TIM) ; 12-14 Oct. 2016; Huntsville, AL; United States
    Format: application/pdf
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  • 47
    Publication Date: 2016-11-16
    Description: Payloads are assessed for nominal operations. Payload Developers have the option of performing a maintenance hazard assessment (MHA) for potential maintenance activities. When POIC (Payload Operations and Integration Center) Safety reviews an OCR calling for a maintenance procedure, we cannot approve it without a MHA. If no MHA exists, we contact MER (Mission Evaluation Room) Safety. Depending on the nature of the problem, MER Safety has the option to: Analyze and grant approval themselves; Direct the payload back to the ISRP (Integrated Safety Review Panel); Direct the payload to the IMMT (Increment Mission Management Team).
    Keywords: Space Transportation and Safety
    Type: M17-5610 , Tri-Lateral Operational Safety Technical Interchange Meeting (TIM); 12-14 Oct. 2016; Huntsville, AL; United States
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  • 48
    Publication Date: 2016-09-09
    Description: Whether life exists on worlds other than Earth is one of the most compelling questions facing space science today. Given that, on Earth, life exists wherever water is found, worlds harboring large amounts of water are prime targets in the search for an answer to this question. Jovian moons Europa, Callisto, and Ganymede; Saturnian moons Enceladus and Titan; and possibly Neptune's Triton are all worlds in the outer solar system on which large quantities of water can be found in solid and liquid form. So compelling are these worlds as targets for scientific study that the United States Congress recently initiated a directive to NASA to create an "Ocean Worlds Exploration Program, comprised of frequent small, medium and large missions that poses the potential to revolutionize our understanding of the solar system and life within it, perhaps more profoundly event than the modern-day search for past or extant life on Mars. Any life detected at the remote "ocean worlds" in the outer solar system would likely have formed and evolved along an independent path from life on Earth itself, giving us a deeper understanding of the potential for broad variety amongst life in the universe. In NASA's robotic study of Mars, a key to the success of the "search for water" was the ability to conduct iterative exploration via a series of missions launched on a regular cadence based on 26-month cycles of prime planetary-alignment windows of reduced transit time. Through this cadence, NASA was able to send to Mars a series of orbiters and landers, using the knowledge gained from each mission to inform and refine the goals of the next. The ability to conduct iterative exploration in this manner could have a substantial impact on exploration of the "ocean worlds," allowing scientists to narrow their targets of interest in the search for life based on data sent back by successive missions. This ability is currently limited by the transit periods available from contemporary evolved expendable launch vehicles. In the case of Europa, one of the nearer of these ocean worlds, current transit times are seven to nine years; iterative exploration of Europa would require decades. In the coming decade, NASA's new Space Launch System (SLS) could revolutionize exploration of the outer solar system by dramatically reducing transit times. Designed to enable human exploration of deep space, SLS will be the world's most powerful launch vehicle, offering unparalleled payload mass and volume and departure energy. In the case of Europa, SLS will reduce transit time to two to three years, enabling an iterative exploration cadence closer to what is currently experienced for Mars. SLS competed its critical design review during summer 2015 and is making rapid progress toward initial launch readiness. This paper will provide background on the importance of these ocean worlds and an overview and status of SLS, and will discuss the potential for the use of SLS in a robust iterative search for life in our solar system.
    Keywords: Life Sciences (General); Space Sciences (General); Lunar and Planetary Science and Exploration
    Type: M15-4863 , COSPAR 2016 Meeting; 30 Jul. - 7 Aug. 2016; Istanbul; United States
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  • 49
    facet.materialart.
    Unknown
    In:  CASI
    Publication Date: 2016-09-09
    Description: No abstract available
    Keywords: Aerospace Medicine
    Type: M16-5476 , Payload Operations and Integration Working Group Meeting; 26-28 Jul. 2016; Huntsville, AL ; United States
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  • 50
    facet.materialart.
    Unknown
    In:  CASI
    Publication Date: 2016-11-16
    Description: No abstract available
    Keywords: Space Transportation and Safety
    Type: M17-5609 , Tri-Lateral Operational Safety Technical Interchange Meeting; 12-14 Oct. 2016; Huntsville, AL; United States
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  • 51
    facet.materialart.
    Unknown
    In:  CASI
    Publication Date: 2016-11-16
    Description: No abstract available
    Keywords: Quality Assurance and Reliability; Space Transportation and Safety
    Type: M17-5608 , Tri-Lateral Operational Safety Technical Interchange (TIM) Meeting; 12-14 Oct. 2016; Huntsville, AL; United States
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  • 52
    facet.materialart.
    Unknown
    In:  CASI
    Publication Date: 2016-09-13
    Description: No abstract available
    Keywords: Lunar and Planetary Science and Exploration
    Type: JSC-CN-37460 , EVA Technology Collaboration Workshop; 13-16 Sep. 2016; Houston, TX; United States
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  • 53
    Publication Date: 2017-09-06
    Description: From its upcoming first flight, NASA's new Space Launch System (SLS) will represent a game-changing opportunity for smallsats. On that launch, which will propel the Orion crew vehicle around the moon, the new exploration-class launch vehicle will deploy 13 6U CubeSats into deep-space, where they will continue to a variety of destinations to perform diverse research and demonstrations. Following that first flight, SLS will undergo the first of a series of performance upgrades, increasing its payload capability to low Earth orbit from 70 to 105 metric tons via the addition of a powerful upper stage. With that change to the vehicle's architecture, so too will its secondary payload accommodation for smallsats evolve, with current plans calling for a change from the first-flight limit of 6U to accommodating a range of sizes up to 27U and potentially ESPA-class payloads. This presentation will provide an overview and update on the first launch of SLS and the secondary payloads it will deploy. Currently, flight hardware has been produced for every element of the vehicle, testing of the vehicle's propulsion elements has been ongoing for years, and structural testing of its stages has begun. Major assembly and testing of the Orion Stage Adapter, including the secondary payload accommodations, will be completed this year, and the structure will then be shipped to Kennedy Space Center for integration of the payloads. Progress is being made on those CubeSats, which will include studies of asteroids, Earth, the sun, the moon, and the impacts of radiation on organisms in deep space. They will feature revolutionary innovations for smallsats, including demonstrations of use of a solar sail as propulsion for a rendezvous with an asteroid, and the landing of a CubeSat on the lunar surface. The presentation will also provide an update on progress of the SLS Block 1B configuration that will be used on the rocket's second flight, a discussion of planned secondary payload accommodations on that configuration of the vehicle, and a look at the current state of planning of upcoming missions and what that could mean for deep-space smallsat flight opportunities.
    Keywords: Spacecraft Design, Testing and Performance; Earth Resources and Remote Sensing
    Type: M17-5930 , Interplanetary CubeSat Workshop (iCubeSat) 2017; 30-31 May 2017; Cambridge; United Kingdom
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  • 54
    Publication Date: 2017-05-23
    Description: Symbiotic star surveys have traditionally relied almost exclusively on low resolution optical spectroscopy. However, we can obtain a more reliable estimate of their total Galactic population by using all available signatures of the symbiotic phenomenon. Here we report the discovery of a hard X-ray source, 4PBC J0642.9+5528, in the Swift hard X-ray all-sky survey, and identify it with a poorly studied red giant, SU Lyn, using pointed Swift observations and ground-based optical spectroscopy. The X-ray spectrum, the optical to UV spectrum, and the rapid UV variability of SU Lyn are all consistent with our interpretation that it is a symbiotic star containing an accreting white dwarf. The symbiotic nature of SU Lyn went unnoticed until now, because it does not exhibit emission lines strong enough to be obvious in low resolution spectra. We argue that symbiotic stars without shell-burning have weak emission lines, and that the current lists of symbiotic stars are biased in favor of shell-burning systems. We conclude that the true population of symbiotic stars has been underestimated, potentially by a large factor.
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN41432 , Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711; e-ISSN 1365-8711); Volume 461; No. 1; L1-L5
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  • 55
    Publication Date: 2017-06-17
    Description: From its upcoming first flight, NASA's new Space Launch System (SLS) will represent a game-changing opportunity for smallsats. On that launch, which will propel the Orion crew vehicle around the moon, the new exploration-class launch vehicle will deploy 13 6U CubeSats into deep-space, where they will continue to a variety of destinations to perform diverse research and demonstrations. Following that first flight, SLS will undergo the first of a series of performance upgrades, increasing its payload capability to low Earth orbit from 70 to 105 metric tons via the addition of a powerful upper stage. With that change to the vehicle's architecture, so too will its secondary payload accommodation for smallsats evolve, with current plans calling for a change from the first-flight limit of 6U to accommodating a range of sizes up to 27U and potentially ESPA-class payloads. This presentation will provide an overview and update on the first launch of SLS and the secondary payloads it will deploy. Currently, flight hardware has been produced for every element of the vehicle, testing of the vehicle's propulsion elements has been ongoing for years, and structural testing of its stages has begun. Major assembly and testing of the Orion Stage Adapter, including the secondary payload accommodations, will be completed this year, and the structure will then be shipped to Kennedy Space Center for integration of the payloads. Progress is being made on those CubeSats, which will include studies of asteroids, Earth, the sun, the moon, and the impacts of radiation on organisms in deep space. They will feature revolutionary innovations for smallsats, including demonstrations of use of a solar sail as propulsion for a rendezvous with an asteroid, and the landing of a CubeSat on the lunar surface. The presentation will also provide an update on progress of the SLS Block 1B configuration that will be used on the rocket's second flight, a discussion of planned secondary payload accommodations on that configuration of the vehicle, and a look at the current state of planning of upcoming missions and what that could mean for deep-space smallsat flight opportunities.
    Keywords: Spacecraft Design, Testing and Performance; Earth Resources and Remote Sensing
    Type: M17-5930 , Interplanetary CubeSat Workshop; 30-31 May 2017; Cambridge; United Kingdom
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  • 56
    Publication Date: 2017-04-15
    Description: Coronal mass ejections (CMEs) are major transient phenomena in the solar corona that are observed with ground-based and spacecraft-based coronagraphs in white light or with in situ measurements by spacecraft. CMEs transport mass and momentum and often drive shocks. In order to derive the CME and shock trajectories with high precision, we apply the graduated cylindrical shell (GCS) model to fit a flux rope to the CME directed toward STEREO A after about 19:00 UT on 29 November 2013 and check the quality of the heliocentric distance-time evaluations by carrying out a three-dimensional magnetohydrodynamic (MHD) simulation of the same CME with the Block Adaptive Tree Solar-Wind Roe Upwind Scheme (BATS-R-US) code. Heliocentric distances of the CME and shock leading edges are determined from the simulated white light images and magnetic field strength data. We find very good agreement between the predicted and observed heliocentric distances, showing that the GCS model and the BATS-R-US simulation approach work very well and are consistent. In order to assess the validity of CME and shock identification criteria in coronagraph images, we also compute synthetic white light images of the CME and shock. We find that the outer edge of a cloud-like illuminated area in the observed and predicted images in fact coincides with the leading edge of the CME flux rope and that the outer edge of a faint illuminated band in front of the CME leading edge coincides with the CME-driven shock front.
    Keywords: Solar Physics
    Type: GSFC-E-DAA-TN40667 , Journal of Geophysical Research: Space Physics (e-ISSN 2169-9402); Volume 121; Issue 3; 1886-1906
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  • 57
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    In:  CASI
    Publication Date: 2017-04-01
    Description: Introduction / Background; Current Landscape and Future Vision; UAS (Unmanned Aircraft System) Demand and Key Challenges; UAS Airspace Access Pillars and Enablers; Overarching UAS Community Strategy; Long Term Vision Considerations; Recommendations and Next Steps.
    Keywords: Air Transportation and Safety
    Type: DFRC-E-DAA-TN39927 , UAS in the NAS Group; 24 Mar. 2017; Edwards, CA; United States
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  • 58
    Publication Date: 2017-08-25
    Description: Current human space travel consists primarily of long-duration missions onboard the International Space Station (ISS), but in the future may include exploration-class missions to nearby asteroids, Mars, or its moons. These missions will expose astronauts to increased risk of oxidative and inflammatory damage from a variety of sources, including radiation, psychological stress, reduced physical activity, diminished nutritional status, and hyperoxic exposure during extravehicular activity. Evidence exists that increased oxidative stress and inflammation can accelerate the development of atherosclerosis.
    Keywords: Aerospace Medicine
    Type: JSC-CN-38038 , NASA Human Research Program Investigators' Workshop (HRP IWS 2017); 23-26 Jan. 2017; Galveston, TX; United States
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  • 59
    facet.materialart.
    Unknown
    In:  CASI
    Publication Date: 2017-07-01
    Description: No abstract available
    Keywords: Spacecraft Design, Testing and Performance
    Type: JSC-CN-37381-3 , 2016 Tri-Lateral Safety and Mission Assurance Conference; 13-15 Sep. 2016; Sagamihara; Japan
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  • 60
    facet.materialart.
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    In:  CASI
    Publication Date: 2017-09-21
    Description: No abstract available
    Keywords: Spacecraft Design, Testing and Performance; Space Transportation and Safety; Astrodynamics
    Type: JSC-CN-40431 , AIAA Space 2017 Conference; 12-14 Sep. 2017; Orlando, FL; United States
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  • 61
    Publication Date: 2017-09-19
    Description: We evaluate Greenland Ice Sheet (GrIS) surface reflectance and albedo trends using the newly released Collection 6 (C6) MODIS (Moderate Resolution Imaging Spectroradiometer) products over the period 2001-2016. We find that the correction of MODIS sensor degradation provided in the new C6 data products reduces the magnitude of the surface reflectance and albedo decline trends obtained from previous MODIS data (i.e., Collection 5, C5). Collection 5 and 6 data product analysis over GrIS is characterized by surface (i.e., wet vs. dry) and elevation (i.e., 500-2000 m, 2000 m and greater) conditions over the summer season from 1 June to 31 August. Notably, the visible-wavelength declining reflectance trends identified in several bands of MODIS C5 data from previous studies are only slightly detected at reduced magnitude in the C6 versions over the dry snow area. Declining albedo in the wet snow and ice area remains over the MODIS record in the C6 product, albeit at a lower magnitude than obtained using C5 data. Further analyses of C6 spectral reflectance trends show both reflectance increases and decreases in select bands and regions, suggesting that several competing processes are contributing to Greenland Ice Sheet albedo change. Investigators using MODIS data for other ocean, atmosphere and/or land analyses are urged to consider similar re-examinations of trends previously established using C5 data.
    Keywords: Environment Pollution; Meteorology and Climatology; Statistics and Probability; Instrumentation and Photography
    Type: GSFC-E-DAA-TN46015 , The Cryosphere (ISSN 1994-0416; e-ISSN 1994-0424); Volume 11; Issue 4; 1781-1795
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  • 62
    facet.materialart.
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    In:  CASI
    Publication Date: 2017-08-18
    Description: DSG will be placed in halo orbit around themoon- Platform for international/commercialpartners to explore lunar surface- Testbed for technologies needed toexplore Mars Habitat module used to house up to 4crew members aboard the DSG- Launched on EM-3- Placed inside SLS fairing Habitat Module - Task Habitat Finite Element Model Re-modeled entire structure in NX2) Used Beam and Shell elements torepresent the pressure vessel structure3) Created a point cloud of centers of massfor mass components- Can now inspect local moments andinertias for thrust ring application8/ Habitat Structure Docking Analysis Problem: Artificial Gravity may be necessary forastronaut health in deep spaceGoal: develop concepts that show how artificialgravity might be incorporated into a spacecraft inthe near term Orion Window Radiant Heat Testing.
    Keywords: Spacecraft Design, Testing and Performance
    Type: JSC-CN-40342 , Summer Intern Final Presentation; * Aug. 2017; Houston, TX; United States
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  • 63
    Publication Date: 2017-08-17
    Description: No abstract available
    Keywords: Spacecraft Design, Testing and Performance
    Type: JSC-CN-40261 , NASA's Space Technology Mission Directorate (STMD) ESI Parachute FSI Workshop; 12-13 Oct. 2017; virtual; United States
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  • 64
    Publication Date: 2017-07-15
    Description: We are discussing needs of current and future airspace users and identifying implications for architecture and services.
    Keywords: Air Transportation and Safety
    Type: ARC-E-DAA-TN43857 , The Way Forward for New and Current Airspace Users; 20 Jun. 2017; Moffett Field, CA; United States
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  • 65
    Publication Date: 2019-05-07
    Description: Responses of animals exposed to microgravity during in-space experiments were observed via available video recording stored in the NASA Ames Life Sciences Data Archive. These documented observations of animal behavior, as well as the range and level of activities during spaceflight, demonstrate that weightlessness conditions and the extreme novelty of the surroundings may exert damaging psychological stresses on the inhabitants. In response to a recognized need for in-flight animals to improve their wellbeing we propose to reduce such stresses by shaping and interrelating structures and surroundings to satisfying vital physiological needs of inhabitants. A Rodent Habitat Hardware System (RHHS) based housing facility incorporating a tubing network system, to maintain and monitor rodent health environment with advanced accessories has been proposed. Placing mice in a tubing-configured environment creates more natural space-restricted nesting environment for rodents, thereby facilitating a more comfortable transition to living in microgravity. A sectional tubing structure of the RHHS environment will be more beneficial under microgravity conditions than the provision of a larger space area that is currently utilized. The new tubing configuration was found suitable for further incorporation of innovative monitoring technology and accessories in the animal holding habitat unit which allow to monitor in real-time monitoring of valuable health related biological parameters under weightlessness environment of spaceflight.
    Keywords: Life Sciences (General)
    Type: ARC-E-DAA-TN50007
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  • 66
    Publication Date: 2018-01-27
    Description: Flexibility where possible, and structure where necessary. Consider the needs of national security, safe airspace operations, economic opportunities, and emerging technologies. Risk-based approach based on population density, assets on the ground, density of operations, etc. Digital, virtual, dynamic, and as needed UTM services to manage operations.
    Keywords: Air Transportation and Safety
    Type: ARC-E-DAA-TN30358 , On-Demand Mobility and Follow Up Workshop; 8-9 Mar. 2016; Arlington, VA; United States
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  • 67
    facet.materialart.
    Unknown
    In:  Other Sources
    Publication Date: 2018-03-20
    Description: No abstract available
    Keywords: Environment Pollution
    Type: Public Health Reports (ISSN 0033-3549; e-ISSN 1468-2877 ); Volume 132; No. 1; 14-17
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  • 68
    Publication Date: 2018-03-10
    Description: It is our hope that the "Landsat Legacy" story will appeal to a broader audience than just those who use Landsat data on a regular basis. In an era when ready access to images and data from Earth-observing satellites is routine, it is hard to believe that only a few decades ago this was not the case. As the world's first digital land-observing satellite program, Landsat missions laid the foundation for modern space-based Earth observation and blazed the trail in the new field of quantitative remote sensing.
    Keywords: Earth Resources and Remote Sensing
    Type: GSFC-E-DAA-TN48821
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  • 69
    Publication Date: 2018-03-07
    Description: High-fidelity computational simulations have been performed which focus on rotor-fuselage and rotor-rotor aerodynamic interactions of small quad-rotor vehicle systems. The three-dimensional unsteady Navier-Stokes equations are solved on overset grids using high-order accurate schemes, dual-time stepping, low Mach number preconditioning, and hybrid turbulence modeling. Computational results for isolated rotors are shown to compare well with available experimental data. Computational results in hover reveal the differences between a conventional configuration where the rotors are mounted above the fuselage and an unconventional configuration where the rotors are mounted below the fuselage. Complex flow physics in forward flight is investigated. The goal of this work is to demonstrate that understanding of interactional aerodynamics can be an important factor in design decisions regarding rotor and fuselage placement for next-generation multi-rotor drones.
    Keywords: Numerical Analysis; Aerodynamics; Aircraft Design, Testing and Performance; Computer Systems
    Type: ARC-E-DAA-TN40938 , Annual American Helicopter Society (AHS) Forum and Technology Display 2017; 9-11 May 2017; Fort Worth, TX; United States
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  • 70
    Publication Date: 2018-02-23
    Description: The design and operational experience with the first controlled Exo-Brake system flown during March, 2017, as conducted by the NASA Ames Research Center, is described. The Exo-Brake is an exo atmospheric braking and de-orbit device which had successfully flown twice before in a fixed-drag configuration on the nano-sat orbital platforms TechEdSat-3,4. The TechEdSat-5 flight, was the first to permit a commanded shape change which affected the drag (thus, ballistic coefficient), and thus allowed improved targeting. The use of the Iridium constellation and on-board Short Burst Data (SBD) modems, as well as Global Positioning Systems (GPS), permitted daily updates to be performed. This allowed compensation for the Thermosphere density variations captured in the F10.7 variable.Current and highly detailed analysis based on Monte-Carlo techniques suggest that approx. 7 modulations can achieve a relatively small 〈200km target ellipse at the Von Karman altitude. Drag data and over-all performance of the system is provided, as well as the description of the proposed subsequent experimental flights. There are noted advantaged for this type of de-orbit procedure as compared to a more traditional propulsion based de-orbit system.Also, the comparison with solar-sail type systems is shown to be favorable. The rapid flight series, of which this is a part, is conducted as a hands-on training environment for young professionals and university partners. In the future, such Exo-Brake systems may be used for more accurate nano-sat or small-sat disposal - or the development of technologies to permit on-demand sample return from Low Earth Orbit (LEO) scientific/manufacturing platforms.
    Keywords: Spacecraft Design, Testing and Performance; Astronautics (General)
    Type: ARC-E-DAA-TN42177 , 2017 CubeSat Developers Workshop ; 26-28 Apr. 2017; San Louis Obispo, CA; United States
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  • 71
    Publication Date: 2017-10-18
    Description: Conduct research, development and testing to identify airspace operations requirements to enable large-scale visual and beyond visual line of sight UAS operations in the low-altitude airspace. Use build-a-little-test-a-little strategy remote areas to urban areas Low density: No traffic management required but understanding of airspace constraints. Cooperative traffic management: Understanding of airspace constraints and other operations. Manned and unmanned traffic management: Scalable and heterogeneous operations. UTM construct consistent with FAAs risk-based strategy. UTM research platform is used for simulations and tests. UTM offers path towards scalability.
    Keywords: Air Transportation and Safety
    Type: ARC-E-DAA-TN38460 , Aerophilia 2017; 27-28 Jan. 2017; Manglore; India
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  • 72
    facet.materialart.
    Unknown
    In:  CASI
    Publication Date: 2017-11-29
    Description: No abstract available
    Keywords: Air Transportation and Safety
    Type: ARC-E-DAA-TN46065
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  • 73
    Publication Date: 2017-11-15
    Description: Although pediatric regional anesthesia has a demonstrated record of safety, adverse events, especially those related to block performance issues, still may occur. To reduce the frequency of those events, we developed a Regional Anesthesia Time-Out Checklist using expert opinion and the Delphi method.
    Keywords: Statistics and Probability; Aerospace Medicine
    Type: Regional Anesthesia and Pain Medicine; Volume 42; Issue 1; 105-108
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  • 74
    facet.materialart.
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    In:  Other Sources
    Publication Date: 2017-10-02
    Description: We will present information about the Restore-L Servicing Mission, a technology demonstration of servicing technologies via the robotic on-orbit refueling of a functional Government-owned satellite in polar low Earth orbit. This demonstration would establish U.S. leadership in robotic on-orbit satellite servicing, accelerate the maturation of technologies critical to NASAs Journey to Mars, and jumpstart a new domestic commercial servicing industry. We will present an overview of the Restore-L servicing mission, which was recently approved to progress to flight. We will also describe the technologies that NASA is advancing to achieve this mission, and provide the current status of the Restore-L effort.
    Keywords: Aeronautics (General); Cybernetics, Artificial Intelligence and Robotics
    Type: GSFC-E-DAA-TN31128/SUPP , Embedded Systems Conference; 13-14 Apr. 2016; Boston, MA; United States
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  • 75
    facet.materialart.
    Unknown
    In:  CASI
    Publication Date: 2016-06-07
    Description: A simple, systematic, optimized vortex-lattice approach is developed for application to lifting-surface problems. It affords a significant reduction in computational costs when compared to current methods. Extensive numerical experiments have been carried out on a wide variety of configurations, including wings with camber and single or multiple flaps, as well as high-lift jetflap systems. Rapid convergence as the number of spanwise or chordwise lattices are increased is assured, along with accurate answers. The results from this model should be useful not only in preliminary aircraft design but also, for example, as input for wake vortex roll-up studies and transonic flow calculations.
    Keywords: AERODYNAMICS
    Type: NASA. Langley Res. Center Vortex-Lattice Utilization; p 325-342
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  • 76
    Publication Date: 2016-05-27
    Description: In collaboration with the external community and other government agencies, NASA will develop enabling technologies, standards, and design guidelines to support cost-effective applications of automation and limited autonomy for individual components of aviation systems. NASA will also provide foundational knowledge and methods to support the next epoch. Research will address issues of verification and validation, operational evaluation, national policy, and societal cost-benefit. Two research and development approaches to aviation autonomy will advance in parallel. The Increasing Autonomy (IA) approach will seek to advance knowledge and technology through incremental increases in machine-based support of existing human-centered tasks, leading to long-term reallocation of functions between humans and machines. The Autonomy as a New Technology (ANT) approach seeks advances by developing technology to achieve goals that are not currently possible using human-centered concepts of operation. IA applications are mission-enhancing, and their selection will be based on benefits achievable relative to existing operations. ANT applications are mission-enabling, and their value will be assessed based on societal benefit resulting from a new capability. The expected demand for small autonomous unmanned aircraft systems (UAS) provides an opportunity for development of ANT applications. Supervisory autonomy may be implemented as an expansion of the number of functions or systems that may be controlled by an individual human operator. Convergent technology approaches, such as the use of electronic flight bags and existing network servers, will be leveraged to the maximum extent possible.
    Keywords: Air Transportation and Safety; Cybernetics, Artificial Intelligence and Robotics
    Type: ARC-E-DAA-TN30439 , Aerospace Control and Guidance Systems Committee Meeting; 15-18 Mar. 2016; Napa, CA; United States
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  • 77
    Publication Date: 2017-05-03
    Description: Electron pitch angle (D(sub (alpha alpha))) and momentum (D(sub pp)) diffusion coefficients have been calculated due to resonant interactions with electrostatic electron cyclotron harmonic (ECH) and whistler mode chorus waves. Calculations have been performed at two spatial locations L=4.6 and 6.8 for electron energies less than or equal to 10 keV. Landau (n=0) resonance and cyclotron harmonic resonances n= +/- 1, +/-2, ... +/-5 have been included in the calculations. It is found that diffusion coefficient versus pitch angle (alpha) profiles show large dips and oscillations or banded structures. The structures are more pronounced for ECH and lower band chorus (LBC) and particularly at location 4.6. Calculations of diffusion coefficients have also been performed for individual resonances. It is noticed that the main contribution of ECH waves in pitch angle diffusion coefficient is due to resonances n=+1 and n=+2. A major contribution to momentum diffusion coefficients appears from n=+2. However, the banded structures in D(sub alpha alpha) and D(sub pp) coefficients appear only in the profile of diffusion coefficients for n=+2. The contribution of other resonances to diffusion coefficients is found to be, in general, quite small or even negligible. For LBC and upper band chorus waves, the banded structures appear only in Landau resonance. The D(sub pp) diffusion coefficient for ECH waves is one to two orders smaller than D(sub alpha alpha) coefficients. For chorus waves, D(sub pp) coefficients are about an order of magnitude smaller than D(sub alpha alpha) coefficients for the case n does not equal 0. In case of Landau resonance, the values of D(sub pp) coefficient are generally larger than the values of D(sub alpha alpha) coefficients particularly at lower energies. As an aid to the interpretation of results, we have also determined the resonant frequencies. For ECH waves, resonant frequencies have been estimated for wave normal angle 89 deg and harmonic resonances n= +1, +2, and +3, whereas for whistler mode waves, the frequencies have been calculated for angle 10 deg and Landau resonance. Further, in ECH waves, the banded structures appear for electron energies 1 greater than or equal to keV, and for whistler mode chorus waves, structures appear for energies greater than 2 keV at L=4.6 and above 200 eV for L=6.8. The results obtained in the present work will be helpful in the study of diffusion curves and will have important consequences for diffuse aurora and pancake distributions.
    Keywords: Plasma Physics
    Type: GSFC-E-DAA-TN41231 , 3D Bioprinting: Physical and Chemical Processes; 2-3 May 2017; Winston Salem, NC; United States|Physics of Plasmas (ISSN 1070-664X; e-ISSN 1089-7674); Volume 23; Issue 4; 042101
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  • 78
    Publication Date: 2017-05-02
    Description: We report the identification of a bright hard X-ray source dominating the M31 bulge above 25 keV from a simultaneous NuSTAR-Swift observation. We find that this source is the counterpart to Swift J0042.6+4112, which was previously detected in the Swift BAT All-Sky Hard X-Ray Survey. This Swift BAT source had been suggested to be the combined emission from a number of point sources; our new observations have identified a single X-ray source from 0.5 to 50 keV as the counterpart for the first time. In the 0.5-10 keV band, the source had been classified as an X-ray Binary candidate in various Chandra and XMM-Newton studies; however, since it was not clearly associated with Swift J0042.6+4112, the previous E is less than 10keVobservations did not generate much attention. This source has a spectrum with a soft X-ray excess (kT approximately equal to 0.2 keV) plus a hard spectrum with a power law of gamma approximately equal to 1 and a cutoff around 15-20 keV, typical of the spectral characteristics of accreting pulsars. Unfortunately, any potential pulsation was undetected in the NuSTAR data, possibly due to insufficient photon statistics. The existing deep HST (Hubble Space Telescope) images exclude high-mass (greater than 3 times the radius of the moon) donors at the location of this source. The best interpretation for the nature of this source is an X-ray pulsar with an intermediate-mass (less than 3 times the radius of the moon M) companion or a symbiotic X-ray binary. We discuss other possibilities in more detail.
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN41428 , The Astrophysical Journal (ISSN 0004-637X; e-ISSN 1538-4357); Volume 838; No. 1; 47
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  • 79
    Publication Date: 2017-04-29
    Description: The performance of the Time Projection Chamber (TPC) polarimeter for the Polarimeter for Relativistic Astrophysical X-ray Sources (PRAXyS) Small Explorer was evaluated using polarized and unpolarized X-ray sources. The PRAXyS mission will enable exploration of the universe through X-ray polarimetry in the 2-10 keV energy band. We carried out performance tests of the polarimeter at the Brookhaven National Laboratory, National Synchrotron Light Source (BNL-NSLS) and at NASA's Goddard Space Flight Center. The polarimeter was tested with linearly polarized, monochromatic X-rays at 11 different energies between 2.5 and 8.0 keV. At maximum sensitivity, the measured modulation factors at 2.7, 4.5 and 8.0 keV are 27%, 43% and 59%, respectively and the measured angle of polarization is consistent with the expected value at all energies. Measurements with a broadband, unpolarized X-ray source placed a limit of less than 1% on false polarization in the PRAXyS polarimeter.
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN41158 , Nuclear Instruments and Methods in Physics Research A (ISSN 0168-9002); Volume 838; 89-95
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  • 80
    Publication Date: 2017-02-14
    Description: No abstract available
    Keywords: Systems Analysis and Operations Research
    Type: M17-5795 , JPL Model Based Systems Engineering (MBSE) Workshop; 25-27 Jan. 2017; Pasadena, CA; United States
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  • 81
    Publication Date: 2017-02-14
    Description: This plan defines the Space Geodesy Project (SGP) policies, procedures, and requirements for Information and Configuration Management (CM). This procedure describes a process that is intended to ensure that all proposed and approved technical and programmatic baselines and changes to the SGP hardware, software, support systems, and equipment are documented.
    Keywords: Documentation and Information Science
    Type: SGP-MGMT-PROC-0002 , GSFC-E-DAA-TN39067
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  • 82
    Publication Date: 2017-05-04
    Description: We report Magnetospheric Multiscale observations of high-frequency electrostatic waves in the vicinity of the reconnection ion diffusion region on the dayside magnetopause. The ion diffusion region is identified during two magnetopause crossings by the Hall electromagnetic fields, the slippage of ions with respect to the magnetic field, and magnetic energy dissipation. In addition to electron beam modes that have been previously detected at the separatrix on the magnetospheric side of the magnetopause, we report, for the first time, the existence of electron cyclotron harmonic waves at the magnetosheath separatrix. Broadband waves between the electron cyclotron and electron plasma frequencies, which were probably generated by electron beams, were found within the magnetopause current sheet. Contributions by these high-frequency waves to the magnetic energy dissipation were negligible in the diffusion regions as compared to those of lower-frequency waves.
    Keywords: Geophysics
    Type: GSFC-E-DAA-TN41309 , Geophysical Research Letters (ISSN 0094-8276; e-ISSN 1944-8007); Volume 43; Issue 10; 4808–4815
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  • 83
    Publication Date: 2018-04-24
    Description: This guidebook provides an overarching summary of existing policies, activities, and guiding principles for scientific and research integrity with which NASA's workforce and affiliates must conform. This document addresses NASA's obligations as both a research institution and as a funder of research, NASA's use of federal advisory committees, NASA's public communication of research results, and professional development of NASA's workforce. This guidebook is intended to provide a single resource for NASA researchers, NASA research program administrators and project managers, external entities who do or might receive funding from NASA for research or technical projects, evaluators of NASA research proposals, NASA advisory committee members, NASA communications specialists, and members of the general public so that they can understand NASA's commitment to and expectations for scientific and integrity across the agency.
    Keywords: General
    Type: NASA/SP-2017-371 , HQ-E-DAA-TN48714
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  • 84
    Publication Date: 2018-06-11
    Description: In the GEOS-Chem Adjoint (GCA) system, the total (wet) surface pressure of the GEOS meteorology is employed as dry surface pressure, ignoring the presence of water vapor. The Jet Propulsion Laboratory (JPL) Carbon Monitoring System (CMS) research team has been evaluating the impact of the above discrepancy on the CO2 model forecast and the CO2 flux inversion. The JPL CMS research utilizes a multi-mission assimilation framework developed by the Multi-Mission Observation Operator (M2O2) research team at JPL extending the GCA system. The GCA-M2O2 framework facilitates mission-generic 3D and 4D-variational assimilations streamlining the interfaces to the satellite data products and prior emission inventories. The GCA-M2O2 framework currently integrates the GCA system version 35h and provides a dry surface pressure setup to allow the CO2 model forecast to be performed with the GEOS-5 surface pressure directly or after converting it to dry surface pressure.
    Keywords: Meteorology and Climatology
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  • 85
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    In:  Other Sources
    Publication Date: 2018-06-11
    Description: No abstract available
    Keywords: Launch Vehicles and Launch Operations; Spacecraft Design, Testing and Performance
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  • 86
    Publication Date: 2019-06-06
    Description: The overarching theme of this internship at NASA's Kennedy Space Center (KSC) was corrosion engineering and control, a subset of materials engineering located under the NE-L4 branch. KSC, as a costal launch facility, is subjected to incredibly corrosive conditions in the form of high salt content from the nearby ocean, high temperatures and humidity, and frequent storms. As such, corrosion control is a vital part of operations here at KSC. To tackle these issues, this internship focused on three main projects; creating a corrosion control database, revamping KSC's Corrosion Lab website, and running corrosion studies in the lab and in the field.
    Keywords: Metals and Metallic Materials
    Type: KSC-E-DAA-TN45688
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  • 87
    Publication Date: 2019-06-06
    Description: This paper compares fuel consumption of descent trajectories from cruise altitude to meter fix when the required time of arrival is later than the nominal time of arrival at the meter fix. The required delay, which is the difference between the nominal and the required times of arrival, is achieved by either slowing down the aircraft in the cruise and descent phases or flying a longer route at a constant altitude. Performance models of ten different Boeing and Airbus aircraft, obtained from the Base of Aircraft Data, are employed for generating the results. It is demonstrated that the most fuel-efficient speed control strategy for absorbing delay is first reducing descent speed as much as possible and then reducing cruise speed. This is a common finding for all ten aircraft considered. For some aircraft, flying at a fixed flight path angle and constant Mach-calibrated-airspeed results in lower fuel consumption compared to standard descent at idle-thrust and constant Mach-calibrated- airspeed. Finally, for the cases examined, it is shown that executing a path stretch maneuver at cruise altitude and descent at a reduced speed is more fuel efficient than inserting an intermediate-altitude cruise segment.
    Keywords: Air Transportation and Safety; Propellants and Fuels
    Type: ARC-E-DAA-TN17124 , Journal of Aircraft (ISSN 0021-8669) (e-ISSN 1533-3868); 53; 6
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  • 88
    Publication Date: 2019-06-06
    Description: This paper presents a design approach and basic algorithms for a future system that can perform aircraft conflict resolution, arrival scheduling and convective weather avoidance with a high level of autonomy in terminal area airspace. Such a system, located on the ground, is intended to solve autonomously the major problems currently handled manually by human controllers. It has the potential to accommodate higher traffic levels and a mix of conventional and unmanned aerial vehicles with reduced dependency on controllers. The main objective of this paper is to describe the fundamental trajectory and scheduling algorithms that provide the foundation for an autonomous system of the future. These algorithms generate trajectories that are free of conflicts with other traffic, avoid convective weather if present, and provide scheduled times for landing with specified in-trail spacings. The maneuvers the algorithms generate to resolve separation and spacing conflicts include speed, horizontal path, and altitude changes. Furthermore, a method for reassigning arrival aircraft to alternate runways in order to reduce delays is also included. The algorithms generate conflict free trajectories for terminal area traffic, comprised primarily of arrivals and departures to and from multiple airports. Examples of problems solved and performance statistics from a fast-time simulation using simulated traffic of arrivals and departures at the Dallas/Fort Worth International Airport and Dallas Love Field are described.
    Keywords: Aircraft Communications and Navigation
    Type: ARC-E-DAA-TN22021 , Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering (ISSN 0954-4100) (e-ISSN 2041-3025); 230; 9; 1762-1779
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  • 89
    Publication Date: 2018-06-06
    Description: Implicit large-eddy simulation (ILES) of a shock wave boundary-layer interaction (SBLI) was performed. Quantities present in the exact equation of the turbulent kinetic energy (TKE) transport were accumulated. These quantities will be used to calculate the components of TKE-like production, dissipation, transport, and dilatation. Correlations of these terms will be presented to study the growth and interaction between various terms. A comparison with its RANS (Reynolds-Averaged Navier-Stokes) counterpart will also be presented.
    Keywords: Aerodynamics; Fluid Mechanics and Thermodynamics
    Type: GRC-E-DAA-TN32970 , AIAA Aviation 2016; 13-17 Jun. 2016; Washington, DC; United States
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  • 90
    Publication Date: 2019-07-02
    Description: Engineering the optical properties of waveguides is important for the optimization of their guided optical mode characteristics. Here, we document the dynamic control of the refractive index and composition of crystalline films, via the substrate temperature, during pulsed-laser-deposition growth of Er(1%)-doped yttrium gallium garnet on 〈100〉-orientated single-crystal yttrium aluminium garnet. An increasing substrate temperature is observed to reduce the gallium content in the grown film, with a corresponding reduction of refractive index. We demonstrate the ability to accurately control the refractive index via this technique and use it to grow a complex multi-core crystal waveguide. Our results highlight the potential of using pulsed laser deposition to fabricate crystal films with bespoke optical properties and thus engineer passive and active waveguide devices in situ.
    Keywords: Optics
    Type: GSFC-E-DAA-TN52154 , Optical Materials Express (e-ISSN 2159-3930); 7; 11; 4073-4081
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  • 91
    Publication Date: 2019-05-21
    Description: A steep decline in archiving could make large tree-ring datasets irrelevant. But increased spatiotemporal coverage, the addition of novel parameters at sub-annual resolution, and integration with other in situ and remote Earth observations will elevate tree-ring data as an essential component of global-change research.
    Keywords: Earth Resources and Remote Sensing
    Type: GSFC-E-DAA-TN68143 , Nature Ecology & Evolution (e-ISSN 2397-334X); 1; 8
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  • 92
    Publication Date: 2019-05-21
    Description: Leaf Area Index (LAI) is a key variable that bridges remote sensing observations to the quantification of agroecosystem processes. In this study, we assessed the universality of the relationships between crop LAI and remotely sensed Vegetation Indices (VIs). We first compiled a global dataset of 1459 in situ quality-controlled crop LAI measurements and collected Landsat satellite images to derive five different VIs including Simple Ratio (SR), Normalized Difference Vegetation Index (NDVI), two versions of the Enhanced Vegetation Index (EVI and EVI2), and Green Chlorophyll Index (CI(sub Green)). Based on this dataset, we developed global LAI-VI relationships for each crop type and VI using symbolic regression and Theil-Sen (TS) robust estimator. Results suggest that the global LAI-VI relationships are statistically significant, crop-specific, and mostly non-linear. These relationships explain more than half of the total variance in ground LAI observations (R2 greater than 0.5), and provide LAI estimates with RMSE below 1.2 m2/m2. Among the five VIs, EVI/EVI2 are the most effective, and the crop-specific LAI-EVI and LAI-EVI2 relationships constructed by TS, are robust when tested by three independent validation datasets of varied spatial scales. While the heterogeneity of agricultural landscapes leads to a diverse set of local LAI-VI relationships, the relationships provided here represent global universality on an average basis, allowing the generation of large-scale spatial-explicit LAI maps. This study contributes to the operationalization of large-area crop modeling and, by extension, has relevance to both fundamental and applied agroecosystem research.
    Keywords: Earth Resources and Remote Sensing
    Type: GSFC-E-DAA-TN40736 , Remote Sensing (e-ISSN 2072-4292); 8; 7; 597
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  • 93
    Publication Date: 2019-05-21
    Description: Pre-launch characterization and calibration of the thermal emissive spectral bands on the Joint Polar Satellite System (JPSS-1) Visible Infrared Imaging Radiometer Suite (VIIRS) is critical to ensure high quality data products for environmental and climate data records post-launch. A comprehensive test program was conducted at the Raytheon El Segundo facility in 2013-2014, including extensive environmental testing. This work is focused on the thermal band radiometric performance and stability, including evaluation of a number of sensor performance metrics and estimation of uncertainties. Analysis has shown that JPSS-1 VIIRS thermal bands perform very well in relation to their design specifications, and comparisons to the Suomi National Polar-orbiting Partnership (SNPP) VIIRS instrument have shown their performance to be comparable.
    Keywords: Earth Resources and Remote Sensing
    Type: GSFC-E-DAA-TN29811 , Remote Sensing (ISSN 2072-4292); 8; 1; 47
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  • 94
    Publication Date: 2019-05-21
    Description: The Advanced Very High Resolution Radiometer (AVHRR) sensor provides a unique global remote sensing dataset that ranges from the 1980's to the present. Over the years, several efforts have been made on the calibration of the different instruments to establish a consistent land surface reflectance time-series and to augment the AVHRR data record with data from other sensors such as the Moderate Resolution Imaging Spectroradiometer (MODIS). In this paper, we present a summary of all the corrections applied to the AVHRR Surface Reflectance and NDVI Version 4 Product, developed in the framework of the National Oceanic and Atmospheric Administration (NOAA) Climate Data Record (CDR) program. These corrections result from assessment of the geo-location, improvement of the cloud masking and calibration monitoring. Additionally, we evaluate the performance of the surface reflectance over the AERONET sites by a cross-comparison with MODIS, which is an already validated product, and evaluation of a downstream Leaf Area Index (LAI) product. We demonstrate the utility of this long time-series by estimating the winter wheat yield over the USA. The methods developed by [1] and [2] are applied to both the MODIS and AVHRR data. Comparison of the results from both sensors during the MODIS-era shows the consistency of the dataset with similar errors of 10%. When applying the methods to AVHRR historical data from the 1980's, the results have errors equivalent to those derived from MODIS.
    Keywords: Earth Resources and Remote Sensing
    Type: GSFC-E-DAA-TN40735 , Remote Sensing (e-ISSN 2072-4292); 9; 3; 296
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  • 95
    Publication Date: 2016-07-14
    Description: This is a 20 minute presentation discussing the DELIVER vision. DELIVER is part of the ARMD Transformative Aeronautics Concepts Program, particularly the Convergent Aeronautics Solutions Project. The presentation covers the DELIVER vision, transforming markets, conceptual design process, challenges addressed, technical content, and FY2016 key activities.
    Keywords: Aeronautics (General)
    Type: ARC-E-DAA-TN30303 , On-Demand Mobility and Follow Up Workshop; 8-9 Mar. 2016; Arlington, VA; United States
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  • 96
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    In:  CASI
    Publication Date: 2016-06-25
    Description: Providing Spacecraft Status for the Earth Observing System which includes Terra, Aqua and Aura missions to the Direct Broadcast community.
    Keywords: Communications and Radar; Earth Resources and Remote Sensing
    Type: GSFC-E-DAA-TN33119 , NASA Direct Readout Conference (NDRC-9): EOS/S-NPP Direct Readout Conference; 21-24 Jun. 2016; Valladolid; Spain
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  • 97
    Publication Date: 2017-05-11
    Description: An eruption of Italian volcano Mount Etna on 3 December 2015 produced fast-moving sulfur dioxide (SO2) and sulfate aerosol clouds that traveled across Asia and the Pacific Ocean, reaching North America in just 5days. The Ozone Profiler and Mapping Suite's Nadir Mapping UV spectrometer aboard the U.S. National Polar-orbiting Partnership satellite observed the horizontal transport of the SO2 cloud. Vertical profiles of the colocated volcanic sulfate aerosols were observed between 11.5 and 13.5 km by the new Cloud Aerosol Transport System (CATS) space-based lidar aboard the International Space Station. Backward trajectory analysis estimates the SO2 cloud altitude at 7-12 km. Eulerian model simulations of the SO2 cloud constrained by CATS measurements produced more accurate dispersion patterns compared to those initialized with the back trajectory height estimate. The near-real-time data processing capabilities of CATS are unique, and this work demonstrates the use of these observations to monitor and model volcanic clouds.
    Keywords: Meteorology and Climatology
    Type: GSFC-E-DAA-TN41915 , Geophysical Research Letters (ISSN 0094-8276); Volume 43; No. 20; 11,089–11,097
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  • 98
    Publication Date: 2017-06-10
    Description: Presentation provides a NASA Goddard overview; earned value at Goddard: the good, the bad, and the ugly; the dynamic project environment and the business change initiative; and applying earned value.
    Keywords: Administration and Management
    Type: GSFC-E-DAA-TN43133 , EVM (Earned Value Management) World 2017; 31 May - 2 Jun. 2017; New Orleans, LA; United States
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  • 99
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    In:  CASI
    Publication Date: 2017-06-08
    Description: No abstract available
    Keywords: Aeronautics (General); Cybernetics, Artificial Intelligence and Robotics
    Type: GSFC-E-DAA-TN31128 , Embedded Systems Conference; 13-14 Apr. 2016; Boston, MA; United States
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  • 100
    Publication Date: 2017-03-22
    Description: We present a spherical harmonic solution of the static gravity field of Mars to degree and order 120, GMM-3, that has been calculated using the Deep Space Network tracking data of the NASA Mars missions, Mars Global Surveyor (MGS), Mars Odyssey (ODY), and the Mars Reconnaissance Orbiter (MRO). We have also jointly determined spherical harmonic solutions for the static and time-variable gravity field of Mars, and the Mars k 2 Love numbers, exclusive of the gravity contribution of the atmosphere. Consequently, the retrieved time-varying gravity coefficients and the Love number k 2 solely yield seasonal variations in the mass of the polar caps and the solid tides of Mars, respectively. We obtain a Mars Love number k 2 of 0.1697 +/-0.0027 (3- sigma). The inclusion of MRO tracking data results in improved seasonal gravity field coefficients C 30 and, for the first time, C 50 . Refinements of the atmospheric model in our orbit determination program have allowed us to monitor the odd zonal harmonic C 30 for approx.1.5 solar cycles (16 years). This gravity model shows improved correlations with MOLA topography up to 15% larger at higher harmonics ( l = 6080) than previous solutions.
    Keywords: Lunar and Planetary Science and Exploration
    Type: GSFC-E-DAA-TN40220 , ICARUS (ISSN 0019-1035 ; e-ISSN 1090-2643); Volume 272; 228–245
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