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  • Fluid Mechanics and Thermodynamics  (74)
  • Pflanzenschädling  (43)
  • AERODYNAMICS  (41)
  • GEOPHYSICS
  • Physics
  • 1950-1954  (73)
  • 1945-1949  (89)
Collection
Keywords
Language
Years
Year
  • 1
    Unknown
    New York : Dover Publications
    Keywords: Physics ; Vectors ; Electostatics ; Electostatic Instuments ; Conduction ; Resistance ; EMF ; Electolysis ; Conductance
    Description / Table of Contents: "Maxwell is without peer. This printing is an opportunity to become thoroughly acquainted with the thought of the greatest of our electrical scientists." — School Science and Math Here is the final elaboration of Maxwell's theory of electromagnetism, including the systematic and rigorous derivation of his general equations of field theory. These equations continue to occupy a central position in the modern physicist's view of the physical world. They are a magnificent summary of the fundamental advances in electricity and magnetism, and later inspired the theories of Lorentz on the electron and Einstein on relativity. Einstein himself has said that "The formulation of these equations is the most important event in physics since Newton's time." (The Evolution of Physics.) Volume 1, Part 1, "Electrostatics," describes electrostatic phenomena and develops a mathematical theory of electricity. Maxwell discusses electrical work and energy in a system of conductors, mechanical action between two electrical systems, forms of equipotential surfaces and line of flow, spherical harmonics, the theory of electric images, and other topics. Part II, "Electrokinematics," deals with electric current conduction and resistance, electromotive force between bodies in contact, electrolysis, the mathematical theory of the distribution of electric currents, and other topics.
    Pages: Online-Ressource (XXXII, 506 Seiten)
    Edition: 3rd unabridged ed.
    ISBN: 0486606368
    Language: English
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  • 2
    Unknown
    New York : Dover Publications
    Keywords: Physics ; Magnetism ; Induction ; Solenoids ; Measurements ; Electromagnetism ; Ampere ; Current ; Field ; Units ; Current Sheet ; Instruments ; Coil ; Light
    Description / Table of Contents: "Maxwell is without peer. This printing is an opportunity to become thoroughly acquainted with the thought of the greatest of our electrical scientists." — School Science and MathHere is the final elaboration of Maxwell's theory of electromagnetism, including the systematic and rigorous derivation of his general equations of field theory. These equations continue to occupy a central position in the modern physicist's view of the physical world. They are a magnificent summary of the fundamental advances in electricity and magnetism, and later inspired the theories of Lorentz on the electron and Einstein on relativity. Einstein himself has said that "The formulation of these equations is the most important event in physics since Newton's time." (The Evolution of Physics.) Volume 1, Part 1, "Electrostatics," describes electrostatic phenomena and develops a mathematical theory of electricity. Maxwell discusses electrical work and energy in a system of conductors, mechanical action between two electrical systems, forms of equipotential surfaces and line of flow, spherical harmonics, the theory of electric images, and other topics. Part II, "Electrokinematics," deals with electric current conduction and resistance, electromotive force between bodies in contact, electrolysis, the mathematical theory of the distribution of electric currents, and other topics.
    Pages: Online-Ressource (XXIV, 500 Seiten)
    Edition: 3rd unabridged ed.
    ISBN: 0486606376
    Language: English
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  • 3
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    In:  Ztschr. hyg. Zool. 37; p.317-320
    Publication Date: 1949
    Description: Bericht über das Auftreten einiger Vorrats- und Holzschädlinge in Haushalten aus den Jahren 1947-1949. In sehr geringem Umfang ist auch Zahlenmaterial angegeben. KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Baden-Württemberg ; 1947-1949 ; Forst ; Pflanzenschädling
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  • 4
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    In:  Natur und Volk 78; p.58-65
    Publication Date: 1948
    Description: Qualitative Schilderung des Befalls durch die und der Verbreitung der San José-Schildlaus anhand einiger Beobachtungen an Obstgewächsen in Baden-Württemberg und teilw. Nord-Bayern. KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Baden-Württemberg ; 1946-1947 ; Pflanzenschädling ; Obst
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  • 5
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    In:  Wetter und Klima 1; p.316
    Publication Date: 1948
    Description: In einem kleinen allgemeinen Kommentar wird der Zusammenhang zwischen Wind (v.a. Windrichtung) und anderen Wetterbedingungen in Verbindung mit der Ausbreitung des Kartoffelkäfers und des Borkenkäfers genannt. KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Deutschland ; 1943-46 ; Kartoffeln ; Forst ; Pflanzenschädling ; Hackfrüchte
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  • 6
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    In:  Gesunde Pflanzen 6; p.166-168
    Publication Date: 1954
    Description: Der Autor erklärt das massenhafte Auftreten verschiedener Blattlausarten Ende Mai 1954 mit trockenem warmem Wetter und nennt 19°C Tagesmitteltemperatur und Schwachwindigkeit als Fluginitiator für die Blattläuse. KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Berlin, Hannover, Bonn ; 1954 ; Pflanzenschädling ; Witterung
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  • 7
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    In:  Nachrichtenblatt des deutschen Pflanzenschutzdienstes 5, Nr.10; p.145-150
    Publication Date: 1953
    Description: Der Autor untersuchte die für das Auftreten des weißen Bärenspinners günstigen Temperaturen im ehemaligen Jugoslawien (Palic, Vojvodina) und Österreich (Burgenland) und identifizierte die Temperaturen von Mai bis August als wichtige Einflußfaktoren auf die Entwicklungszeit des Falters. Hierdurch konnten Temperaturen identifiziert werden bei denen eine, zwei oder sogar drei Generationen im Jahresverlauf vorkommen können. Sobald die Temperaturen 14-15°C überschreiten, kann die Entwicklung der ersten Generation beginnen. Die gewonnenen Erkenntnisse wurden dazu eingesetzt, um das Ausbreitungspotential des Schmetterlings aufgrund klimatischer Parameter nach Mitteleuropa abzuschätzen. KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Jugoslawien, Österreich, Deutschland ; 1946-1952 ; Pflanzenschädling ; Temperatur
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  • 8
    Publication Date: 1949
    Description: Der Autor untersuchte im Freiland die Zeiten zu denen Ausschlüpfen, Begattung und Eiablage des Springwurmwicklers stattfindet. Zudem wurden Temperatur und relative Luftfeuchte gemessen und mit den Beobachtungen zum Schaderreger in Verbindung gesetzt. KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Breisgau, Freiburg ; 1943-1944 ; Luftfeuchte ; Pflanzenschädling ; Temperatur ; Wein
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  • 9
    Publication Date: 1952
    Description: Vergleich des täglichen Flugverhaltens der Aphiden Doralis fabae und Myzodes persicae (Zweigipfelige Kurve) mit der Psyllide Trioza nigricornis (Eingipfelige Kurve). Die Prozentuale Verteilung der Blattläuse auf verschiedene Flughöhen wird analysiert. Die Abhängigkeit des Flugverhaltens der Blattläuse von den Faktoren Licht, Wind,Temperatur, relative Luftfeuchte wird untersucht. Zudem wird deren kombinierte Wirkung auf den Flug der Homopteren untersucht und im Zuge dessen die drei Homopteren in drei verschiedene Reaktionstypen eingeordnet. KATASTER-BESCHREIBUNG: Grenzwert der Windgeschwindigkeit für den aktiven Abflug von Aphidae und Psyllidae. Regressionsgleichungen für den Zusammenhang zwischen Temperatur und Flugtätigkeit der beiden Aphidae (T(200)=Temperatur in 2m Höhe; T(10)=Temperatur in 10 cm Höhe); Multipler Korrel.koeff. zwischen Temp., modif. rel. Luftf. und dem aktiven Anflug von Trioza nigricornis R=0,742; Zusammenhang der Flugtätigkeit von T. nigricornis und Temp, ist linear -〉 siehe Korrelationstabelle KATASTER-DETAIL: Wind 〉3km/h dann aktiver Abflug Aphiden = 0; Delta T (2m;〈18,46°C) + oder Delta T (2m;〉18,46°C) - oder Delta T (10cm;〈17,18°C) + oder Delta T (10cm;〉17,18°C) - dann Flugtätigkeit M.persicae + ;Delta T (2m;〈19,32°C) + oder Delta T (2m;〉19,32°C) - oder Delta T (10cm;〈19,5°C) + oder Delta T (10cm;〉19,5°C) - dann Flugtätigkeit D.fabae + ;Delta T + und Delta relf (bis 60-70%) - dann Anflug T.nigricornis + Regressionsgleichungen für Myzodes persicae: Flugtätigkeit(FT)=-136,19 + 16,61*T(200) - 0,45*T(200)²; FT=-95,62 + 13,74*T(10) - 0,40*T(10)²; Regressionsgleichungen für Doralis fabae: FT=-62,56 + 8,075*T(200) - 0,209*T(200)²; FT=-93,29 + 11,193*T(10) - 0,287*T(10)²;
    Keywords: Quedlinburg, Thüringen ; 1951 ; Tabak ; Getreide ; Pflanzenschädling ; Hackfrüchte ; Obst ; Zierpflanzen ; Gemüse
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  • 10
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    In:  Ratgeber Obst-, Gartenbau, Geflügelzucht, Heft 5, p. 102-103
    Publication Date: 1951
    Description: Beschreibung der Faktoren für Lebenslauf und Massenvermehrung sowie Ratschläge zur Bekämpfung des Apfelwicklers mittels Spritzungen KATASTER-BESCHREIBUNG: Zusammenhang zwischen Entwicklung des Apfelwicklers in seinen Stadien und der Temperatur sowie der Feuchtigkeit KATASTER-DETAIL: Delta T: Tmin 〈 10°C, dann keine Entwicklung von Ei und Raupe möglich; T 〈 11°C, dann keine Entwicklung von Puppe möglich; Delta T +, dann Einbohren in den Apfel +; T〈15°C, dann kein Einbohren möglich; Tmit(Dekade)〉15°C, dann Flugbeginn; Delta Nied (Mai+Juni)-, dann Apfelwickler +
    Keywords: Bayern ; 1950 ; Pflanzenschädling ; Temperatur ; Obst
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  • 11
    Publication Date: 1954
    Description: Bericht über Untersuchungen zur Terminwahl für die Bekämpfung von Kohlschotenrüßler und Kohlschotengallmücke sowie Vergleiche der Ergebnisse mit der bisherigen Literatur KATASTER-BESCHREIBUNG: Einfluss der Temperatur auf das Auftreten des Kohlschotenrüßlers KATASTER-DETAIL: Delta T +: Tmit 〉 15°C, dann Erscheinen des Kohlschotenrüßlers
    Keywords: Sachsen-Anhalt ; 1952-1953 ; Pflanzenschädling ; Temperatur ; Raps
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  • 12
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    In:  Anz. Schädlingskunde 26, p. 49-51
    Publication Date: 1953
    Description: Untersuchungen zum durch Spinnmilben (Tetranychus althaeae v. hanst.) an Zuckerrüben verursachten Schadbild je nach der Befallsintensität KATASTER-BESCHREIBUNG: - KATASTER-DETAIL: -
    Keywords: Diendorf, Österreich ; 1952 ; Zuckerrüben ; Pflanzenschädling
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  • 13
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    In:  Nachrichten Blatt für den deutschen Pflanzenschutzdienst, p. 101-104
    Publication Date: 1947
    Description: Beobachtungen zu den Witterungsverhältnissen im Winter 1946/47 und im Sommer 1947 und deren Auswirkungen auf den Rapserdfloh sowie ein Vergleich mit ähnlichen vergangenen Ereignissen KATASTER-BESCHREIBUNG: Zusammenhang zwischen Witterung (Temperatur und Niederschlag) und der Entwicklung des Rapserdflohs KATASTER-DETAIL: Delta T: T 〈 6°C, dann Eiablage; Delta T +, dann Schlüpfergebnis -; T 〉 30°C, dann keine Entwicklung von Larven Delta Nied -, dann Austrocknung der Eier +;
    Keywords: Mecklenburg, Thüringen, Sachsen, Brandenburg ; 1946-1947 ; Boden ; Niederschlag ; Pflanzenschädling ; Temperatur ; Trockenheit ; Witterung ; Raps
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  • 14
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    In:  Mitteilungen aus der Biologischen Zentralanstalt für Land- und Forstwirtschaft, Berlin-Dahlem, Heft 69
    Publication Date: 1950
    Description: Bericht über die Ergebnisse der Untersuchungen zu den Wechselwirkungen zwischen Larve und Wirtspflanze KATASTER-BESCHREIBUNG: Einfluss der Temperatur auf den Larvenbefall KATASTER-DETAIL: Delta T -, dann Entwicklungsdauer der Larven +; T 〉 0°C, dann Froststarre und Wanderfähigkeit -; Delta T - und Delta Relf +, dann Larvenmortalität +
    Keywords: Berlin-Dahlem ; 1948-1949 ; Insekten ; Luftfeuchte ; Pflanzenschädling ; Temperatur ; Raps
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  • 15
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    In:  Neue Mitt. Landwirtsch. 4; p.130-132
    Publication Date: 1949
    Description: Der Autor beschreibt den Lebenszyklus der Frittfliege und dokumentiert das Auftreten des Schädlings in vergangenen Jahren. In einem sehr kurzen Absatz wird das Auftreten des schädlings mit warmem Frühlingswetter und der Sonnenscheindauer bzw. der Temperatur im Mai in Verbindung gebracht. KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Deutschland ; 1948 ; Getreide ; Pflanzenschädling ; Gerste
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  • 16
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    In:  Nachrichtenblatt des deutschen Pflanzenschutzdienstes 2.Jahrg., Nr.11; p.161-165
    Publication Date: 1950
    Description: In Freilandversuchen wurden Temperaturen ermittelt, bei denen Kartoffelkäfer den Boden im Frühjahr verlassen. Zudem wurden Minimalwerte für das Überleben in verschiedenen Bodenarten ermittelt. KATASTER-BESCHREIBUNG: Ein kritischer Wert der Bodentemperatur wurde für das massenhafte Verlassen des Bodens durch den Kartoffelkäfer ermittelt. Allerdings wurden auch bei 12,5°C Bodentemperatur bereits Kartoffelkäfer an der Oberfläche beobachtet. KATASTER-DETAIL: Kritischer Wert= 16,6°C Bodentemperatur (in 50cm Tiefe)
    Keywords: Heidelberg ; 1949-1950 ; Kartoffeln ; Pflanzenschädling ; Hackfrüchte
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  • 17
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    In:  Mitteilungen aus der Biologischen Zentralanstalt für Land- und Forstwirtschaft Berlin-Dahlem, Heft 73
    Publication Date: 1952
    Description: 4-jährige Feldexperimente und -beobachtungen zum winterlichen Massenwechsel der grünen Pfirsichblattlaus KATASTER-BESCHREIBUNG: Entscheidende Faktoren für Vorkommen und Ausmaß der anholozyklischen Überwinterung KATASTER-DETAIL: Delta T-: T(Bodennähe)〈= -5°C, dann Myzodes persicae -; Winterfröste: Dauer + , zeitiger, Minimum -, dann Myzodes persicae -; Nachwinter: Delta T + und Delta Nied -, dann Myzodes persicae +
    Keywords: Kölner Bucht ; 1948 - 1951 ; Pflanzenschädling ; Temperatur
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  • 18
    Publication Date: 1949
    Description: Untersuchungen zum Auftreten der Pfirsichblattlaus und zum Befall mit der Blattrollkrankheit KATASTER-BESCHREIBUNG: Abhängigkeit der Stärke des Pfirsichblattlausauftretens vom Niederschlag im Mai/Juni KATASTER-DETAIL: Delta Nied: Nied 〉 80mm, dann Laus -
    Keywords: Baden ; 1947 - 1948 ; Kartoffeln ; Niederschlag ; Pflanzenschädling
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  • 19
    Publication Date: 1949
    Description: Beschreibende Beobachtungen zu den Generationen und zur Eiablage des Pflaumenwicklers sowie zur Bekämpfung mittels Spritzungen KATASTER-BESCHREIBUNG: - KATASTER-DETAIL: -
    Keywords: Norddeutschland ; 1938/39 u. 1945-1947 ; Pflanzenschädling
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  • 20
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    In:  Beiträge zur Entomologie, Band 3, p. 518-529
    Publication Date: 1953
    Description: Untersuchungen zum Ausbleiben des erwarteten starken Befalls im Herbst 1952 und Vergleich mit bereits veröffentlichten Erkenntnissen zum Massenwechsel des Rapserdflohs; KATASTER-BESCHREIBUNG: Abhängigkeit des Massenwechsels des Rapserdflohs von der Witterung (Temperatur) KATASTER-DETAIL: Delta T -: Delta T (August, September) -, dann Zuwanderung der Rapserdflöhe -;
    Keywords: Sachsen-Anhalt ; 1951-1953 ; Pflanzenschädling ; Temperatur ; Witterung ; Raps
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  • 21
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    In:  Neue Mitt. Landwirtsch. 4; p.153-154
    Publication Date: 1949
    Description: Autor präsentiert Beobachtungsergebnisse, sowie Ergebnisse von Laborversuchen zum Überwintern der grünen Pfirsichblattlaus. Untersucht wurde hauptsächlich das untere Temperaturlimit für den Schädling. KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Labor ; 1943-1948 ; Pflanzenschädling ; Obst
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  • 22
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    In:  Nachr.-Bl. Deutscher Pflanzenschutzdienst 2; p.3-5
    Publication Date: 1948
    Description: Der Autor bringt das starke Auftreten des Kohlweißlings und der Rübenblattwespe, die verheerende Schäden an Kohl- bzw. Senffeldern verursachten, mit der Trockenheit des Sommers 1947 in weiten Teilen Nord-, Mittel- und Ostdeutschlands in Verbindung. KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Thüringen, Sachsen, Sachsen-Anhalt, Brandenburg ; 1947 ; Pflanzenschädling ; Kohl ; Sonderkulturen ; Gemüse
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  • 23
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    In:  Gesunde Pflanzen 4, Heft 10; p.274-277
    Publication Date: 1952
    Description: Eine kurze Zusammenfassung der Einsparungen durch nicht benötigte Traubenwickler- und Peronosporabekämpfungen in der Pfalz im Jahre 1952 wird gegeben. Hierfür werden große Hitze und Trockenheit im Jahre 1952 im Vergleich zum Vorjahr und zum 31-jährigen Mittel als Ursache genannt. Die Prognose wurde durch Beobachtungen erstellt. KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Pfalz ; 1951-1952 ; Pflanzenkrankheit ; Pflanzenschädling ; Wein
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  • 24
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    In:  Neue Mitt. Landwirtsch. 6, Nr.9; p.139-140
    Publication Date: 1951
    Description: Der Autor entwickelt ein Temperatursummenmodell zur Vorhersage der Kopula des Apfelblütenstechers. KATASTER-BESCHREIBUNG: Temperatursummenmodell zur Vorhersage der Kopula des Apfelblütenstechers KATASTER-DETAIL: Kopula tritt ab einer Temperatursumme (aufsummierte Stundenwerte) von 900-1000°C bei einer Basis von 8°C auf.
    Keywords: Hessen, Dippelshof ; 1948-1950 ; Apfel ; Pflanzenschädling ; Temperatur
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  • 25
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    In:  Nachr.-Bl. Biol. Ztr.-Anstalt Braunschweig, p. 82
    Publication Date: 1949
    Description: Verbale Beobachtungen zur Freilandüberwinterung der grünen Pfirsichblattlaus KATASTER-BESCHREIBUNG: - KATASTER-DETAIL: -
    Keywords: Niedersachsen ; 1948-1949 ; Pflanzenschädling
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  • 26
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    In:  Nachrichtenblatt des deutschen Pflanzenschutzdienstes 1; p.105-109
    Publication Date: 1947
    Description: Es wird über beobachtete Schwankungen im Auftreten des Kartoffelerdflohes im Zuge einer Temperaturerhöhung im Frühjahr 1947 berichtet. KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Sachsen-Anhalt, Thüringen ; 1947 ; Kartoffeln ; Pflanzenschädling ; Hackfrüchte
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  • 27
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    In:  Der Obstanbau, p. 184-185
    Publication Date: 1953
    Description: Beobachtungen zur Masseneinablage und zur Witterung KATASTER-BESCHREIBUNG: Zusammenhang zischen der Luftfeuchtigkeit und dem Flug sowie der Eiablage des Apfelwicklers KATASTER-DETAIL: Delta Relf (Trockenperioden) +, dann Flug + und Eiablage +
    Keywords: Deutschland ; 1952 ; Pflanzenschädling ; Trockenheit
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  • 28
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    In:  Zeitschrift für Pflanzenbau und Pflanzenschutz, p. 241-266
    Publication Date: 1950
    Description: Untersuchungen zur Verbreitung und zum Massenwechsel der grünen Pfirsichblattlaus hinsichtlich der Faktoren Wind und Thermik KATASTER-BESCHREIBUNG: Zusammenhang zwischen Massenvermehrung der Laus und Morphologie sowie meteorologischen Verhältnissen der Landschaft KATASTER-DETAIL: Wind +, dann Pfirsichblattlaus Wanderung +; Wind +, dann Strecke +; Sonneneinstrahlung +, dann Ausbreitung +; Nied +, dann Ausbreitung -;
    Keywords: Bayern ; 1950 ; Insekten ; Pflanzenschädling ; Wind ; Witterung
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  • 29
    Publication Date: 1950
    Description: Untersuchungen zur Schlüpfzeit, der Generationszahl und der Abflugzeiten von Myzodes persicae Sulzer am Pfirsichbaum KATASTER-BESCHREIBUNG: Zusammenhang zwischen Klima, Witterung und Schlüpfablauf von Myzodes persicae KATASTER-DETAIL: Delta T -, dann Verzögerung im Schlüpfablauf
    Keywords: Bonn ; 1947-1950 ; Kartoffeln ; Pflanzenschädling ; Temperatur
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  • 30
    Publication Date: 1947
    Description: Untersuchungen zur Entwicklung der Obstbaumspinnmilbe, ihrer Eiablage und ihres sonstigen Verhaltens unter natürlichen Umweltbedingungen KATASTER-BESCHREIBUNG: Zusammenhänge zwischen Temperatur und Niederschlag und der Anzahl und dem zeitlichen Vorkommen der Generationen sowie des Schlüpfens der Larven. KATASTER-DETAIL: Delta Nied +, dann Zeit für Entwicklung der Milben +; Delta T +, dann Zeit von Eiablage bis Schlüpfen -; Delta T + ,Delta Sonn + und/oder Delta Relf +, dann Anzahl schlüpfender Larven +; Delta T - und/oder Delta Nied +, dann Zeit für Entwicklung der Larven und Nymphen +; Delta T - und/oder Delta Nied +, dann Mortalität(Larven und Nymphen)+; Delta T + und Delta Relf -, dann Anzahl gelegter Sommereier +; Delta T +, dann Zeit für Entwicklung der Sommereier -; Delta T -, dann Anzahl gelegter Wintereier -; T 〈= 8°C, dann keine Eiablage; Delta Wind +, dann Anzahl abgewehter Milben +; Delta T (Frühjahr und Sommer) + und Delta Relf (Frühjahr und Sommer) -, dann starker Befall
    Keywords: Bergisches Land und Labor ; 1943-1944, 1946 ; Niederschlag ; Pflanzenschädling ; Temperatur ; Witterung ; Obst
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  • 31
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    In:  Nachr. Bl. Biolog. Ztr.-Anst. Braunschweig, p.19
    Publication Date: 1949
    Description: Verbale Beschreibung des Massenauftretens 1948 sowie früheren Massenauftretens (1891, 1922, 1925, 1938 und 1939) KATASTER-BESCHREIBUNG: Zusammenhang zwischen Witterung (Temperatur und Luftfeuchte) und dem Massenauftreten des Käfers KATASTER-DETAIL: Delta T + (Sommer und Winter) und Delta Relf (Sommer) -, dann Massenauftreten im Folgejahr
    Keywords: Deutschland ; 1947-1948 ; Zuckerrüben ; Pflanzenschädling ; Temperatur ; Trockenheit ; Witterung ; Gemüse
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  • 32
    Publication Date: 1948
    Description: Allgemeine Beobachtungen zur Lebensweise des Rüben-Derbrüsslers KATASTER-BESCHREIBUNG: Zusammenhang zwischen dem Massenauftreten des Käfers und der Witterung im Frühjahr und Sommer KATASTER-DETAIL: Delta T: T 〈 12-14°C, dann Ende der Winterruhe; Delta T+, dann Flugbeginn; Delta Nied (Frühjahr und Sommer) +, dann Massenauftreten +;
    Keywords: Sachsen-Anhalt ; 1948 ; Zuckerrüben ; Niederschlag ; Pflanzenschädling ; Temperatur ; Trockenheit ; Witterung
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  • 33
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    In:  Nachr. Bl. Deutscher Pflanzenschutzdienst, p. 133
    Publication Date: 1948
    Description: Verbale Beschreibung zur Verbeitung und zum Jahreszyklus des Rüben-Derbrüsslers KATASTER-BESCHREIBUNG: Zusammenhang zwischen Temperatur und Jahreszyklus des Käfers KATASTER-DETAIL: Delta T: T (Luft)〉 12-14°C, dann Ende der Winterruhe
    Keywords: Deutschland ; 1946-48 ; Zuckerrüben ; Pflanzenschädling ; Temperatur
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  • 34
    Publication Date: 1951
    Description: Beobachtungen zum Massenauftreten des Rübenderbrüßlers in Abhängigkeit von der vorherrschenden Witterung KATASTER-BESCHREIBUNG: Zusammenhang zwischen der Witterung (Bodentemperatur und Bodenfeuchte) und dem Massenauftreten des Käfers KATASTER-DETAIL: Delta Nied (Sommer) +, dann Mortalität +; Delta T (Sommer des Vorjahres) + und Delta Nied (Sommer des Vorjahres) - sowie Delta T ( Frühjahr des Schadjahres) +, dann Massenauftreten des Käfers +; Delta T: Tmit (Boden) 〉 10°C, Auskriechen der Käfer aus dem Boden
    Keywords: Mitteldeutschland ; 1947-1949 ; Insekten ; Zuckerrüben ; Boden ; Landwirtschaft ; Niederschlag ; Pflanzenschädling ; Temperatur ; Trockenheit ; Witterung
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  • 35
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    In:  Beiträge zur Entomologie, Band 2, Nr. 2/3, p. 256-315
    Publication Date: 1952
    Description: Beobachtungen und Untersuchungen zur Biologie, Epidemiologie und Bekämpfung des Rübenderbrüßlers KATASTER-BESCHREIBUNG: Einflüsse der Witterung auf die Entwicklung und das Massenauftreten des Käfers KATASTER-DETAIL: Delta T und Delta Nied und Delta Sonn: T(Boden)〉8°C und Delta Nied -, Delta T (Luft) + und Delta Sonn +, dann Verlassen des Bodens; Delta T -, dann Unterbrechungen der Abwanderung +; Delta T und Delta Sonn: T〉=22°C und Sonnenschein, dann Flug; Delta T: T〉= 15-17°C, dann Reifung; T=26,2°C und Relf=30-37%, dann maximale Eizahl; T〈2°C, dann Erstarrungszustand; Delta Nied (Mai, Juni) -, dann Massenauftreten +; Delta T +, dann Eizahl +;
    Keywords: Sachsen-Anhalt ; 1950 ; Zuckerrüben ; Boden ; Niederschlag ; Pflanzenschädling ; Temperatur ; Witterung ; Sonnenscheindauer
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  • 36
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    In:  Mitteilungen aus der Biologischen Zentralanstalt für Land- und Forstwirtschaft Berlin-Dahlem, Heft 79
    Publication Date: 1954
    Description: Zusammenfassender Bericht über die in den Jahren 1947-1952 in Westdeutschland durchgeführten Untersuchungen zur Epidemiologie, Verbreitung, wirtschaftlichen Bedeutung und Bekämpfung dieser Virose KATASTER-BESCHREIBUNG: Hauptbefallsgebiete sind solche, mit mildem Winterklima, in denen die langjährigen Mittelwerte des kältesten Monats Januar nicht unter 0°C abfallen; KATASTER-DETAIL: Delta T(Sommer)+ und Delta Nied (Sommer) -, dann Delta t(Individualentwicklung der Überträger)- und Massenentwicklung (der Überträger) +; Delta T(Sommer)+ und Delta Nied (Sommer)-, dann Vergilbungsschäden +; Delta T - und Delta Lichtintensität -, dann Wirkung des Virus -;
    Keywords: Westdeutschland ; 1947-1952 ; Infektionskrankheiten ; Ertrag ; Niederschlag ; Pflanzenkrankheit ; Pflanzenschädling ; Temperatur ; Trockenheit ; Wachstum ; Witterung ; Düngung
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  • 37
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    In:  Nachrichtenblatt des Deutschen Pflanzenschutzdienstes, p. 171-172
    Publication Date: 1950
    Description: Bericht über die Beobachtungen zur Entwicklung und zum Auftreten der Möhrenfliege unter dem Einfluss der Witterung und der Lage KATASTER-BESCHREIBUNG: Einfluss der Witterung und der Lage auf die Befallsstärke der Fliege KATASTER-DETAIL: Delta Lichtintensität +, dann Möhrenfliegenbefall -; Delta Nied +, dann Entwicklung der Maden +; Delta Wind +, dann Befall -
    Keywords: Schleswig-Holstein ; 1948-1949 ; Insekten ; Niederschlag ; Pflanzenschädling ; Temperatur ; Trockenheit ; Wind ; Witterung ; Sonnenscheindauer ; Gemüse
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  • 38
    Publication Date: 1953
    Description: Beobachtungen zu den wichtigsten Massenwechselphasen, welche phänologisch mit Hilfe der Temperatursummenregel ausgewertet wurden sowie Beobachtungen zum Einfluss des Mikroklimas auf die Flugphase KATASTER-BESCHREIBUNG: Zusammenhang zwischen den wichtigsten Massenwechselperioden und der Temperatur, angegeben mit der mittleren Temperatursumme ab dem Eintritt des Vorfrühlings (Schneeglöckchenblüte); Einfluss von flugbegrenzenden Faktoren (Licht, Wind, Niederschlag) und flugbeeinflussenden Faktoren (Temperatur, Luftfeuchtigkeit) KATASTER-DETAIL: Temperatursumme = 160°C, dann Schlüpfen der ersten Fundatrixlarven; Temperatursumme = 360°C, dann Eintreten erster reifer Fundatrizen; Temperatursumme = 600°C, dann Reife der ersten fundatrigenen Fliegen und Anfang des fundatrigenen Zufluges; Temperatursumme = 1000-1050°C, dann Ende des fundatrigenen Zufluges und Anfang des virginogenen Zufluges; temperatursumme = 2280-2420°C, dann Ende des virginogenen Zufluges; Delta Lichtintensität + und Windgeschwindigkeit 〈 0,6m/s und T(Blattoberfläche ) 〉= 17°C, bzw. T (Luft) 〉= 15-16°C und Delta Nied -, dann Abflug +; Delta T +, dann Ablfug +, T 〉 20-26°C, dann Abflug -; Relf = 60%, dann optimaler Bereich für Abflug;
    Keywords: Quedlinburg, Thüringen ; 1949-1952 ; Luftfeuchte ; Klima ; Korrelationsmethode ; Niederschlag ; Pflanzenschädling ; Phänologie ; Temperatur ; Wind ; Witterung
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  • 39
    facet.materialart.
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    In:  Z. Pflanzenkrankheiten (Pflanzenpathol.) Pflanzenschutz, Nov./Dez., p. 335-341,
    Publication Date: 1948
    Description: Bericht über allgemeine Beobachtungen zum Flug und zu den Wandergewohnheiten des Großen Kohlweißlings KATASTER-BESCHREIBUNG: Einfluss von Wind und Sonnenscheindauer auf den Flug des Kohlweißlings KATASTER-DETAIL: Wind 〉 20km/h, dann kein Flug; Delta Sonn +, dann Flug +;
    Keywords: Deutschland ; 1942-48 ; Pflanzenschädling ; Temperatur ; Sonnenscheindauer ; Kohl
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  • 40
    Publication Date: 1948
    Description: Bericht über die Laboruntersuchungen von Raps- und Rübsenproben auf den Befall mit Rapserdflohlarven KATASTER-BESCHREIBUNG: Einfluss von Temperatur und Trockenheit auf die Entwicklung des Rapserdflohs KATASTER-DETAIL: Delta T + und Delta Nied -, dann spätere Eiablage; Delta Nied -, dann Entwicklung der Eier -
    Keywords: Mecklenburg, Thüringen, Sachsen, Brandenburg ; 1947-1948 ; Luftfeuchte ; Pflanzenschädling ; Temperatur ; Raps
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  • 41
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    In:  Nachrichtenblatt für den deutschen Pflanzenschutzdienst, p. 143-148
    Publication Date: 1953
    Description: Bericht über die Untersuchungen zur Frage der Abhängigkeit der Imagines von klimatischen Faktoren KATASTER-BESCHREIBUNG: Einfluss der Witterung (Temperatur, Wind, Sonnenscheindauer, Luftfeuchte) auf die Flugaktivität KATASTER-DETAIL: Delta T +: T= 18°C, dann Höchstwert an geschlüpften und geschlechtsreifen Käfern; T 〉 18°C oder T 〈 18°C, dann Zahl an geschlüpften und geschlechtsreifen Käfern -; Delta Sonn +, dann Flugaktivität +; T = 23°C und Relf = 70%, dann Optimum der Flugaktivität; T = 13°C, dann Flugaktivität verhindert Delta Wind +: Wind 〉 1m/s, dann Flugaktivität vermindert, Wind 〉 2m/s, dann Flugaktivität stark gehemmt
    Keywords: Sachsen-Anhalt ; 1951-1952 ; Insekten ; Luftfeuchte ; Korrelationsmethode ; Niederschlag ; Pflanzenschädling ; Temperatur ; Wind ; Witterung ; Sonnenscheindauer
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  • 42
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    In:  Zeitschrift
    Publication Date: 1950
    Description: Detailierte Berichte über das Auftreten von Schaderregern in der Landwirtschaft für jedes Jahr; Zusammenhänge zu Witterungsbedingungen werden zu Beginn der entsprechenden Hefte, sowie teilw. bei Besprechung der jeweiligen Schaderreger hergestellt KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Westdeutschland, regional aufgelöst ; 1950-2008 ; Pflanzenkrankheit ; Pflanzenschädling
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  • 43
    Publication Date: 1951
    Description: Hopfenzünsler wurden im Januar aus Winterverstecken genommen und in Glaszylindern untergebracht, worin ihre Lebensdauer unter unterschiedlichen Temperaturen und rel. Luftfeuchten gemessen wurde. Bei niedrigen und hohen Temperaturen stellte sich die Luftfeuchte als entscheidender Faktor heraus, bei mittleren Temperaturen (10-15,5°C und 16-21,5°C) spielte auch die Temperatur eine Rolle. KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Labor ; 1949-1950 ; Getreide ; Pflanzenschädling ; Hopfen
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  • 44
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    In:  Nachrichtenblatt für den Deutschen Pflanzenschutzdienst, Heft 7/8, p.105-112
    Publication Date: 1948
    Description: Untersuchungen im Berliner Botanischen Garten, im Institut für Züchtungsforschungen in Müncheberg/Mark und im Obstbezirk des Alten Landes bei Hamburg/Stade über das Auftreten von Larven, die aus überwinterten Eiern auf Obstbäumen geschlüpft sind sowie Untersuchungen zur Temperaturempfindlichkeit der Fundatrix-Larven und der Sommerform von Myzodes Persicae im Labor. KATASTER-BESCHREIBUNG: Zusammenhang ziwschen Temperatur, Niederschlag sowie relativer Luftfeuchte und dem Überwinterungserfolg KATASTER-DETAIL: Delta T -, Delta Nied ++, Delta Relf +, dann Myzodes persicae -; T 〈 -9°C, dann Myzodes persicae -; T 〈 -12°C (d 〉 1), dann Tod
    Keywords: Deutschland, Labor ; 1933 - 1948 ; Niederschlag ; Pflanzenschädling ; Temperatur
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  • 45
    Publication Date: 1950
    Description: Beobachtungen zum Auftreten von Roggengallmücke, Halmfliege, Getreidehalmwespe, Hafermilbe und Zwergzikade unter bestimmten Witterungsbedingungen (warme und trockene Sommer und Herbste) KATASTER-BESCHREIBUNG: Einfluss der Witterung (Temperatur und Niederschlag) im Sommer und Herbst auf das Auftreten der Getreideschädlinge KATASTER-DETAIL: Delta T (Sommer und Herbst) + und Delta Nied (Sommer und Hebrst) -, dann Auftreten +; Trockenperioden über mindestens 2 Jahre, dann Massenauftreten
    Keywords: Bayern ; 1947-1950 ; Anbautermine ; Landwirtschaft ; Niederschlag ; Pflanzenschädling ; Roggen ; Temperatur ; Trockenheit ; Weizen ; Witterung
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  • 46
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    In:  Other Sources
    Publication Date: 2011-08-17
    Keywords: AERODYNAMICS
    Format: text
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  • 47
    Publication Date: 2019-05-30
    Description: Estimating method for lift interference of wing- body combinations at supersonic speeds
    Keywords: AERODYNAMICS
    Type: NACA-RM-A51J04
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  • 48
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    In:  CASI
    Publication Date: 2016-06-07
    Keywords: AERODYNAMICS
    Type: NACA: Univ. Conf. on Aerodyn.; p 399-411
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  • 49
    Publication Date: 2016-06-07
    Keywords: AERODYNAMICS
    Type: NACA. Langley Aeron. Lab. NACA: Univ. Conf. on Aerodyn.; p 341-353
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  • 50
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    In:  CASI
    Publication Date: 2016-06-07
    Keywords: AERODYNAMICS
    Type: NACA Conf. on Aerodyn. Probl. of Transonic Airplane Design; p 49-52
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  • 51
    Publication Date: 2016-06-07
    Keywords: AERODYNAMICS
    Type: NACA. Ames Aeron. Lab. NACA Conf. on Aerodyn. Probl. of Transonic Airplane Design; p 21-28
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  • 52
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    In:  CASI
    Publication Date: 2016-06-07
    Keywords: AERODYNAMICS
    Type: NACA Conf. on Aerodyn. Probl. of Transonic Airplane Design; p 53-57
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  • 53
    Publication Date: 2016-06-07
    Keywords: AERODYNAMICS
    Type: NACA. Ames Aeron. Lab. NACA Conf. on Aerodyn. Probl. of Transonic Airplane Design; p 3-13
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  • 54
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    In:  CASI
    Publication Date: 2016-06-07
    Keywords: AERODYNAMICS
    Type: NACA: Univ. Conf. on Aerodyn.; p 307-322
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  • 55
    Publication Date: 2016-06-07
    Keywords: AERODYNAMICS
    Type: NACA: Univ. Conf. on Aerodyn.; p 127-149
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  • 56
    Publication Date: 2016-06-07
    Keywords: AERODYNAMICS
    Type: NACA: Univ. Conf. on Aerodyn.; p 29-46
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  • 57
    Publication Date: 2016-06-07
    Keywords: AERODYNAMICS
    Type: NACA: Univ. Conf. on Aerodyn.; p 355-365
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  • 58
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    In:  CASI
    Publication Date: 2016-06-07
    Keywords: AERODYNAMICS
    Type: NACA: Univ. Conf. on Aerodyn.; p 151-166
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  • 59
    Publication Date: 2016-06-07
    Keywords: AERODYNAMICS
    Type: NACA: Univ. Conf. on Aerodyn.; p 109-125
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  • 60
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    In:  CASI
    Publication Date: 2016-06-07
    Keywords: AERODYNAMICS
    Type: NACA. Langley Aeron. Lab. NACA: Univ. Conf. on Aerodyn.; p 325-340
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  • 61
    Publication Date: 2016-06-07
    Keywords: AERODYNAMICS
    Type: NACA Conf. on Aerodyn. Probl. of Transonic Airplane Design; p 95-100
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  • 62
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    In:  CASI
    Publication Date: 2016-06-07
    Keywords: AERODYNAMICS
    Type: NACA. Ames Aeron. Lab. NACA Conf. on Aerodyn. Probl. of Transonic Airplane Design; p 43-48
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  • 63
    Publication Date: 2016-06-07
    Keywords: AERODYNAMICS
    Type: NACA Conf. on Aerodyn. Probl. of Transonic Airplane Design; p 15-20
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  • 64
    Publication Date: 2016-06-07
    Keywords: AERODYNAMICS
    Type: NACA: Univ. Conf. on Aerodyn.; p 377-395
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  • 65
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    In:  CASI
    Publication Date: 2016-06-07
    Keywords: AERODYNAMICS
    Type: NACA. Langley Aeron. Lab. NACA: Univ. Conf. on Aerodyn.; p 367-376
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  • 66
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    In:  CASI
    Publication Date: 2016-06-07
    Keywords: AERODYNAMICS
    Type: NACA: Univ. Conf. on Aerodyn.; p 167-183
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  • 67
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    In:  CASI
    Publication Date: 2016-06-07
    Keywords: AERODYNAMICS
    Type: NACA: Univ. Conf. on Aerodyn.; p 3-26
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  • 68
    Publication Date: 2019-05-29
    Description: Conference on aerodynamics of high speed aircraft
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-57121
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  • 69
    Publication Date: 2019-05-23
    Description: Drag measurements at low lift of four-nacelle aircraft configuration with longitudinal distribution of cross-sectional area conducive to low transonic drag rise
    Keywords: AERODYNAMICS
    Type: NACA-RM-L53E29
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  • 70
    Publication Date: 2019-06-28
    Description: An approximate method for development of flow and thermal boundary layers in laminar regime on cylinders with arbitrary cross section and transpiration-cooled walls is obtained by use of Karman's integrated momentum equation and an analogous heat-flow equation. Incompressible flow with constant property values throughout boundary layer is assumed. Shape parameters for approximated velocity and temperature profiles and functions necessary for solution of boundary-layer equations are presented as charts, reducing calculations to a minimum. The method is applied to determine local heat-transfer coefficients and surface temperature-cooled turbine blades for a given flow rate. Coolant flow distributions necessary for maintaining uniform blade temperatures are also determined.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-RM-E51F22
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  • 71
    Publication Date: 2019-06-28
    Description: The presence of radomes and instruments that are sensitive to water films or ice formations in the nose section of all-weather aircraft and missiles necessitates a knowledge of the droplet impingement characteristics of bodies of revolution. Because it is possible to approximate many of these bodies with an ellipsoid of revolution, droplet trajectories about an ellipsoid of revolution with a fineness ratio of 10 were computed for incompressible axisymmetric air flow. From the computed droplet trajectories, the following impingement characteristics of the ellipsoid surface were obtained and are presented in terms of dimensionless parameters: (1) total rate of water impingement, (2) extent of droplet impingement zone, and (3) local rate of water impingement. These impingement characteristics are compared briefly with those previously reported for an ellipsoid of revolution with a fineness ratio of 5.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-TN-3147
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  • 72
    Publication Date: 2019-06-28
    Description: An investigation at a free-stream Mach number of 2.02 was made to determine the effects of a propulsive jet on a wing surface located in the vicinity of a choked convergent nozzle. Static-pressure surveys were made on a flat surface that was located in the vicinity of the propulsive jet. The nozzle was operated over a range of exit pressure ratios at different fixed vertical distances from the flat surface. Within the scope of this investigation, it was found that shock waves, formed in the external flow because of the presence of the propulsive jet, impinged on the flat surface and greatly altered the pressure distribution. An integration of this pressure distribution, with the location of the propulsive jet exit varied from 1.450 propulsive-jet exit diameters to 3.392 propulsive-jet exit diameters below the wing, resulted in an incremental lift for all jet locations that was equal to the gross thrust at an exit pressure ratio of 2.86. This incremental lift increased with increase in exit pressure ratio, but not so rapidly as the thrust increased, and was approximately constant at any given exit pressure ratio.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-RM-L54E05a
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  • 73
    Publication Date: 2019-06-28
    Description: Numerical solutions of the differential equation obtained from the momentum theorem for the development of a turbulent boundary layer along a thermally insulated surface in two-dimensional and in radial shock-free flow are presented in tabular form for a range of Mach numbers from 0.100 to 10. The solution can be used in a step-wise procedure with any given distribution of favorable pressure gradients and for zero pressure gradients. Solutions are also given for use with moderate adverse pressure gradients. The mean velocity in the boundary layer is approximated by a power-law profile. In view of the stepwise integration methods to be used, the exponent designated the profile shape can be varied along the surface between the integral fraction limits 1/5 and 1/11 through interpolation. Agreement obtained between theoretical and experimental boundary-layer development in a supersonic nozzle at a nominal Mach number of 2 indicates the general validity of the approximations used in the analysis - in particular, the method of extrapolating low-speed skin-friction relations to high Mach number flows. The extrapolation method used assumes that the skin-friction coefficient depend primarily on Reynolds number, provided that the density and the kinematic viscosity are evaluated at surface conditions.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-TN-2045
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  • 74
    Publication Date: 2019-06-28
    Description: The condensation pressure of air was determined over the range of temperature from 60 to 85 K. The experimental results were slightly higher than the calculated values based on the ideal solution law. Heat of vaporization of oxygen was determined at four temperatures ranging from about 68 to 91 K and of nitrogen similarly at four temperatures ranging from 62 to 78 K.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-TN-2969
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  • 75
    Publication Date: 2019-06-28
    Description: The heat requirements for the icing protection of two radome configurations have been studied over a range of design icing conditions. Both the protection limits of a typical thermal protection system and the relative effects of the various icing variables have been determined. For full evaporation of all impinging water, an effective heat density of 14 watts per square inch was required. When a combination of the evaporation and running wet surface systems was employed, a heat requirement of 5 watts per square inch provided protection at severe icing and operating conditions.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-RM-E53A22
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  • 76
    Publication Date: 2019-06-28
    Description: The Navier-Stokes equations of motion and the equation of continuity are transformed so as to apply to an orthogonal curvilinear coordinate system rotating with a uniform angular velocity about an arbitrary axis in space. A usual simplification of these equations as consistent with the accepted boundary-layer theory and an integration of these equations through the boundary layer result in boundary-layer momentum-integral equations for three-dimensional flows that are applicable to either rotating or nonrotating fluid boundaries. These equations are simplified and an approximate solution in closed integral form is obtained for a generalized boundary-layer momentum-loss thickness and flow deflection at the wall in the turbulent case. A numerical evaluation of this solution carried out for data obtained in a curving nonrotating duct shows a fair quantitative agreement with the measures values. The form in which the equations are presented is readily adaptable to cases of steady, three-dimensional, incompressible boundary-layer flow like that over curved ducts or yawed wings; and it also may be used to describe the boundary-layer flow over various rotating surfaces, thus applying to turbomachinery, propellers, and helicopter blades.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-TR-1067
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  • 77
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    Publication Date: 2019-05-10
    Keywords: GEOPHYSICS
    Type: JPL MEMO.-20-88
    Format: text
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  • 78
    Publication Date: 2019-05-10
    Keywords: GEOPHYSICS
    Type: JPL-PR-4-95
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  • 79
    Publication Date: 2019-06-28
    Keywords: AERODYNAMICS
    Type: NACA-RM-A52B06
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  • 80
    Publication Date: 2019-06-28
    Keywords: AERODYNAMICS
    Type: NACA-TN-3283
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  • 81
    Publication Date: 2019-06-28
    Keywords: AERODYNAMICS
    Type: NACA-RM-A53G08
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  • 82
    Publication Date: 2019-06-28
    Description: The general characteristics of the flow field in a submerged air inlet are investigated by theoretical, wind-tunnel, and visual-flow studies. Equations are developed for calculating the laminar and turbulent boundary-layer growth along the ramp floor for parallel, divergent, and convergent ramp walls, and a general equation is derived relating the boundary-layer pressure losses to the boundary-layer thickness. It is demonstrated that the growth of the boundary layer on the floor of the divergent-ramp inlet is retarded and that a vortex pair is generated in such an inlet. Functional relationships are established between the pressure losses in the vortices and the geometry of the inlet. A general discussion of the boundary layer and vortex formations is included, in which variations of the various losses and of the incremental external drag with mass-flow ratio are considered. Effects of compressibility are also discussed.
    Keywords: AERODYNAMICS
    Type: NACA-TN-2323
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  • 83
    Publication Date: 2019-06-28
    Description: An investigation has been conducted in the NACA Cleveland icing research tunnel to determine the aerodynamic and icing characteristics of several recessed fuel-vent configurations. The vents were investigated aerodynamically to obtain vent-tube pressures and pressure distributions on the ramp surface as functions of tunnel-air velocity and angle of attack. Icing investigations were made to determine the vent-tube pressure losses for several icing conditions at tunnel-air velocities ranging from 220 to 440 feet per second. In general, under nonicing conditions, the configurations with diverging ramp walls maintained, vent-tube pressures greater than the required marginal value of 2 inches of water positive pressure differential between the fuel cell and the compartment containing the fuel cell for a range of angles of attack from 0 to 14deg at a tunnel-air velocity of approximately 240 feet per second. A configuration haying divergIng ramp sldewalls, a 7deg ramp angle; and vent tubes manifold,ed to a common plenum chamber opening through a slot In the ramp floor gave the greatest vent-tube pressures for all the configurations investigated. The use of the plenum chamber resulted in uniform pressures in all vent tubes. In a cloud-icing condition, roughness caused by ice formations on the airfoil surface ahead of the vent ramp, rather than icing of the vent configuration, caused a rapid loss in vent-tube pressures during the first few minutes of an icing period. Only the configuration having diverging ramp sidewalls, a 7 ramp angle, and a common plenum chamber maintained the required vent-tube pressures throughout a 60-minute icing period, although the ice formations on this configuration were more severe than those observed for the other configurations. No complete closure of vent-tube openings occurred for the configurations investigated. A simulated freezing-rain condition caused a greater and more rapid vent-tube pressure loss than was observed for a cloud-icing condition.
    Keywords: AERODYNAMICS
    Type: NACA-TN-1789
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  • 84
    Publication Date: 2019-06-28
    Description: The effects of primary and runback ice formations on the section drag of a 36 deg swept NACA 63A-009 airfoil section with a partial-span leading-edge slat were studied over a range of angles of attack from 2 to 8 deg and airspeeds up to 260 miles per hour for icing conditions with liquid-water contents ranging from 0.39 to 1.23 grams per cubic meter and datum air temperatures from 10 to 25 F. The results with slat retracted showed that glaze-ice formations caused large and rapid increases in section drag coefficient and that the rate of change in section drag coefficient for the swept 63A-009 airfoil was about 2-1 times that for an unswept 651-212 airfoil. Removal of the primary ice formations by cyclic de-icing caused the drag to return almost to the bare-airfoil drag value. A comprehensive study of the slat icing and de-icing characteristics was prevented by limitations of the heating system and wake interference caused by the slat tracks and hot-gas supply duct to the slat. In general, the studies showed that icing on a thin swept airfoil will result in more detrimental aerodynamic characteristics than on a thick unswept airfoil.
    Keywords: AERODYNAMICS
    Type: NACA-RM-E53J30
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  • 85
    Publication Date: 2019-06-28
    Description: Calculations have been made for the icing limit of a diamond airfoil at zero angle of attack in terms of the stream Mach number, stream temperature, and pressure altitude. The icing limit is defined as a wetted-surface temperature of 320 F and is related to the stream conditions by the method of Hardy. The results show that the point most likely to ice on the airfoil lies immediately behind the shoulder and is subject to possible icing at Mach numbers as high as 1.4.
    Keywords: AERODYNAMICS
    Type: NACA-TN-2861
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  • 86
    Publication Date: 2019-06-28
    Keywords: AERODYNAMICS
    Type: NACA-RM-E53C26
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  • 87
    Publication Date: 2019-06-28
    Description: The effects of primary and. runback icing and frost formations on the drag of an 8-foot-chord NACA 651-212 airfoil section were investigated over a range of angles of attack from 20 to 80 and airspeeds up to 260 miles per hour for icing conditions with liquid-water contents ranging from 0.25 to 1.4 grams per cubic meter and datum air temperatures of -30 to 30 F. The results showed that glaze-ice formations, either primary or runback, on the upper surface near the leading edge of the airfoil caused large and rapid increases in drag, especially at datum air temperatures approaching 32 F and in the presence of high rates of water catch. Ice formations at lower temperatures (rime ice) did not appreciably increase the drag coefficient over the initial (standard roughness) drag coefficient. Cyclic de-icing of the primary Ice formations on the airfoil leading-edge section permitted the drag coefficient to return almost to the bare airfoil drag value. Runback icing on the lower surface did not present a serious drag problem except when heavy spanwise ridges of runback ice occurred aft of the heatable area. Frost formations caused rapid and large increases in drag with incipient stalling of the airfoil.
    Keywords: AERODYNAMICS
    Type: NACA-TN-2962
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  • 88
    Publication Date: 2019-06-27
    Description: The mechanics of laminar boundary layer transition are reviewed. Drag possibilities for boundary layer control are analyzed using assumed conditions of transition Reynolds number, inlet loss, number of slots, blower efficiency, and duct losses. Although the results of such analysis are highly favorable, those obtained by experimental investigations yield conflicting results, showing only small gains, and sometimes losses. Reduction of this data indicates that there is a lower limit to the quantity of air which must be removed at the slot in order to stabilize the laminar flow. The removal of insufficient air permits transition to occur while the removal of excessive amounts of air results in high power costs, with a net drag increases. With the estimated value of flow coefficient and duct losses equal to half the dynamic pressure, drag reductions of 50% may be obtained; with twice this flow coefficient, the drag saving is reduced to 25%.
    Keywords: AERODYNAMICS
    Type: NASA-CR-145337 , D-7625
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  • 89
    Publication Date: 2019-06-27
    Description: The problem of the minimum induced drag of wings having a given lift and a given span is extended to include cases in which the bending moment to be supported by the wing is also given. The theory is limited to lifting surfaces traveling at subsonic speeds. It is found that the required shape of the downwash distribution can be obtained in an elementary way which is applicable to a variety of such problems. Expressions for the minimum drag and the corresponding spanwise load distributions are also given for the case in which the lift and the bending moment about the wing root are fixed while the span is allowed to vary. The results show a 15-percent reduction of the induced drag with a 15-percent increase in span as compared with results for an elliptically loaded wing having the same total lift and bending moment.
    Keywords: AERODYNAMICS
    Type: NACA-TN-2249 , Collected Works of Robert T. Jones; p 539-556
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  • 90
    Publication Date: 2019-06-27
    Keywords: AERODYNAMICS
    Type: NACA-TN-1292 , NASA-TM-79866
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  • 91
    Publication Date: 2019-06-28
    Description: The trajectories of droplets in the air flowing past NACA 65(1)-208 airfoil and an NACA 65(1)-212 airfoil, both at an angle of attack of 4 degrees, were determined. The amount of water in droplet form impinging on the airfoils, the area of droplet impingement, and the rate of droplet impingement per unit area on the airfoil surface affected were calculated from the trajectories and are presented. The amount, extent, and rate of impingement of the NACA 65(1)-208 airfoil are compared with the results for the NACA 65(1)1-212 airfoil. Under similar conditions of operation, the NACA 65(1)-208 airfoil collects less water than the NACA 65(1)-212 airfoil. The extent of impingement on the upper surface of the NACA 65(1)-208 airfoil is much less than on the upper surface of the NACA 65(1)-212 airfoil, but on the lower surface the extents of impingement are about the same.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-TN-2952
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  • 92
    Publication Date: 2019-06-28
    Description: An investigation has been made in the NACA Lewis icing research tunnel to determine the aerodynamic and icing characteristics of a full-scale induction-system air-scoop assembly incorporating a flush alternate inlet. The flush inlet was located immediately downstream of the offset ram inlet and included a 180 deg reversal and a 90 deg elbow in the ducting between inlet and carburetor top deck. The model also had a preheat-air inlet. The investigation was made over a range of mass-air- flow ratios of 0 to 0.8, angles of attack of 0 and 4 deg airspeeds of 150 to 270 miles per hour, air temperatures of 0 and 25 F various liquid-water contents, and droplet sizes. The ram inlet gave good pressure recovery in both clear air and icing but rapid blockage of the top-deck screen occurred during icing. The flush alternate inlet had poor pressure recovery in both clear air and icing. The greatest decreases in the alternate-inlet pressure recovery were obtained at icing conditions of low air temperature and high liquid-water content. No serious screen icing was observed with the alternate inlet. Pressure and temperature distributions on the carburetor top deck were determined using the preheat-air supply with the preheat- and alternate-inlet doors in various positions. No screen icing occurred when the preheat-air system was operated in combination with alternate-inlet air flow.
    Keywords: AERODYNAMICS
    Type: NACA-RM-E53E07
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  • 93
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    In:  Other Sources
    Publication Date: 2019-07-12
    Description: The rate of heat transfer between a fluid stream in turbulent flow and a smooth, solid wall is largely controlled by the relatively high resistance of the laminar sublayer next to the wall. Although this laminar layer ii extremely thin, heat can be transferred through it only by molecular diffusion. Hence the resistance of this layer is very much greater than for a layer the same thickness farther out in the stream where turbulent exchange is the controlling factor. The thickness of the laminar layer is difficult to define precisely, since there is a gradual transition to the turbulent flow outside, but for the usual scale of many engineering applications almost half the temperature difference between the fluid and the wall occurs in a layer of a few thousands of an inch in thickness. When the wall is made of porous material and a coolant gas is forced through the wall into the stream, it has been found that a very small flow rate of the coolant is remarkably effective in keeping the wall at a low temperature. The coolant flow rate required is such as to give an average velocity normal cooling wall of the order of 1 per cent of the main stream velocity. This flow rate is so low that clearly the injected gas must act as an insulator rather than as a normal coolant. Because of its relatively low velocity, the injected gas can have very little influence on heat convection or momentum transfer in the turbulent stream, and its effect must be confined to the laminar sublayer. The possible influence of the coolant flow on the thickness of the laminar layer will be discussed in Section V.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: JPL-PR-4-50
    Format: text
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  • 94
    Publication Date: 2019-06-28
    Description: The results of wind tunnel tests at NASA Langley targeted at the performance and configurational characteristics of 0.1 and 0.13 scale model spanwise blowing (SWB) jet wing concepts are reported. The concept involves redirection of engine compressor bleed air to provide SWB at the fuselage-wing juncture near the wing leading edge. The tests covered the orientation of the outer panel nozzles, the effects of SWB operation on the performance of leading and trailing edge flaps and the effects of SWB on lateral stability. The trials were run at low speeds and angles of attack from 24-45 deg (landing). Both lift and longitudinal stability improved with the SWB, stall and leading edge vortex breakdown were delayed and performance increased with the SWB rate. Lateral stability was degraded below 20 deg angle of attack while instabilities were delayed above 20 deg due to roll damping.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 84-2195
    Format: text
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  • 95
    Publication Date: 2019-06-27
    Description: An investigation of forced-convection heat transfer and associated pressure drops was conducted with air flowing through electrically heated Inconel tubes having various degrees of square-thread-type roughness, an inside diameter of 1/2 inch, and a length of 24 inches. were obtained for tubes having conventional roughness ratios (height of thread/radius of tube) of 0 (smooth tube), 0.016, 0.025, and 0.037 over ranges of bulk Reynolds numbers up to 350,000, average inside-tube-wall temperatures up to 1950deg R, and heat-flux densities up to 115,000 Btu per hour per square foot. Data The experimental data showed that both heat transfer and friction increased with increase in surface roughness, becoming more pronounced with increase in Reynolds number; for a given roughness, both heat transfer and friction were also influenced by the tube wall-to-bulk temperature ratio. Good correlation of the heat-transfer data for all the tubes investigated was obtained by use of a modification of the conventional Nusselt correlation parameters wherein the mass velocity in the Reynolds number was replaced by the product of air density evaluated at the average film temperature and the so-called friction velocity; in addition, the physical properties of air were evaluated at the average film temperature. The isothermal friction data for the rough tubes, when plotted in the conventional manner, resulted in curves similar to those obtained by other investigators; that is, the curve for a given roughness breaks away from the Blasius line (representing turbulent flow in smooth tubes) at some value of Reynolds number, which decreases with increase in surface roughness, and then becomes a horizontal line (friction coefficient independent of Reynolds number). A comparison of the friction data for the rough tubes used herein indicated that the conventional roughness ratio is not an adequate measure of relative roughness for tubes having a square-thread-type element. The present data, as well as those of other investigators, were used to isolate the influence of ratios of thread height to width, thread spacing to width, and the conventional roughness ratio on the friction coefficient. A fair correlation of the friction data was obtained for each tube with heat addition when the friction coefficient and Reynolds number were defined on the basis of film properties; however, the data for each tube retained the curve characteristic of that particular roughness. The friction data for all the rough tubes could be represented by a single line for the complete turbulence region by incorporating a roughness parameter in the film correlation. No correlation was obtained for the region of incomplete turbulence.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-RM-E52D17 , E-2482
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  • 96
    Publication Date: 2019-06-27
    Description: Research was conducted to determine the effect of the electrode parameters of spacing, configuration, and material' on the energy required for ignition of a flowing propane-air mixture. In addition, the data were used to indicate the energy distribution along the spark length and to confirm previous observations concerning the effect of spark duration on ignition energy requirements. The data were obtained with a mixture at a fuel-air ratio of 0.0835 (by weight), a pressure of 3 inches of mercury absolute, a temperature of 80 F, and a mixture velocity of 5 feet per second. Results showed that the energy required for ignition decreased as the electrode spacing was increased; a minimum energy occurred at. a spacing of 0.65 inch for large electrodes. For small electrodes, the spacing for minimum energy was not sharply defined. Small-diameter electrodes required less energy than large-diameter electrodes if the spacing was less than the optimum distance of 0.65 inch; at a spacing equal to the optimum distance, no difference was noted. Significant effects of electrode material on ignition energy were ascribed to differences in the type of spark discharges produced; glow discharges required higher energy than the arc-glow discharges. With pure glow discharges, the ignition energy was substantially constant for lead, cadmium, brass, aluminum, and tungsten electrodes. A method is described for determining the energy distribution along a glow discharge. It was found that one-third to one-half of the energy in the spark was concentrated in a small region near the cathode electrode, and the remainder was uniformly distributed across the spark gap. It was impossible to ascertain the dependence of ignition on. this distribution. It was also observed that long-duration (600 microsec) sparks required much less energy for ignition than did short-duration (1 microsec) sparks.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-RM-E51J12 , E-2394
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  • 97
    Publication Date: 2019-06-27
    Description: No abstract available
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-RM-E50I29A , REPT-2003
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  • 98
    Publication Date: 2019-06-27
    Description: No abstract available
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-RM-E50I29A
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  • 99
    Publication Date: 2019-06-27
    Keywords: AERODYNAMICS
    Type: NASA-TM-79864 , NACA-TN-3062
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  • 100
    Publication Date: 2019-06-27
    Keywords: AERODYNAMICS
    Type: NASA-TM-79844 , NACA-TR-1198 , NACA-TN-3018
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