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  • AERODYNAMICS  (7)
  • Chemical Engineering
  • Deutschland
  • 1950-1954  (11)
  • 1954  (7)
  • 1951  (4)
  • 1
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    Untersuchungen über das Ertragspotential der deutschen Waldlandschaften (1954)
    In:  AFJZ 125, Seite 153-159
    Details
    Publication Date: 1954
    Description: Darstellung eines Klimaindexes mit direktem Bezug zu Holzzuwachs in Wäldern KATASTER-BESCHREIBUNG: Formel für Klimaindex der mit dem durchschnittlichen Gesamtzuwachs korreliert ist KATASTER-DETAIL: Delta T++: Tmj=2K (alle anderen Faktoren=konstant), dann Zuwachs sinkt um 7.5%; Delta Nied--: prozentualer Rückgang im Jahresniederschlag (alle anderen Faktoren=konstant), dann gleicher prozentualer Rückgang im Zuwachs; I=(P x pn x (Z - 60))/(Tmj - 10) x 92 x 100 (Tmj - mittlere Temperatur Mai – Juli P – jährliche Niederschlagssumme [mm] pn – Anzahl der Tage mit Niederschlag〉=0.1mm May - July Z - Anzahl der Tage ohne Frost (〉 0°))
    Keywords: Deutschland
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    BIBLIOGRAPHY INKA BB
  • 2
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    Methoden zur Vorhersage von Phytophthora-Ausbrüchen (1954)
    In:  Zeitschrift für Acker- und Pflanzenbau 98, Heft 1; p.119-125
    Details
    Publication Date: 1954
    Description: Berichte über Warndienste und Prognoseverfahren der kritischen Witterungsperiodes für Phytophthora infestans aus verschiedenen Ländern (Niederlande, England, Irland, Deutschland) werden zusammengefasst. Es wird beispielhaft auf eine andere Arbeit verwiesen, die die Befallsbedingungen für Krautfäule in Schleswig-Holstein beschreibt. Eine Regel aus klimatischen Parametern für die kritische Periode in Schleswig-Holstein wird rezitiert. Zudem wird eine Regel für das Nulldatum (Gefährdungsbeginn) aus der Literatur für Deutschland. KATASTER-BESCHREIBUNG: Regel für die kritische Periode bei Phytophthora infestans für Schleswig-Holstein. Regel für den Zeitpunkt des Nulldatums in Deutschland für 4 Sorten. KATASTER-DETAIL: Nulldatum liegt bei 800°C bzw. 1100°C Temperatursumme der Tagesmitteltemperaturen ab 1.April (für die Sorten Erstling & Sieglinde bzw. Bona & Flava). Kritische Periode -〉 2 Tage in Folge tmax 〉 23°C, tmin 〉= 10°C, Dampfdruck im Tagesmittel 〉 12mm, mittlere Bewölkung 〉= 5/10; diese Bedingungen treten nur auf, wenn der Warmsektor eines Tiefdruckgebietes über Schleswig-Holstein liegt und in diesem Warmsektor subtropische Luftmassen beobachtet werden.
    Keywords: Deutschland ; 1949-1953 ; Kartoffeln ; Pflanzenkrankheit ; Hackfrüchte
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  • 3
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    Der Einfluß der Witterung auf das Auftreten der Kraut- und Knollenfäule (Phytophthora infestans (Mont.) de Bary) und die sich daraus ergebenden Möglichkeiten für die Einrichtung eines Warndienstes zur Durchführung prophylaktischer Maßnahmen (1954)
    In:  Wissenschaftliche Zeitschrift der Universität Rostock 4; p.47-66
    Details
    Publication Date: 1954
    Description: Zunächst werden Kardinalwerte der verschiedenen Entwicklungsphasen von Phytophthora infestans aus der Literatur zusammengefasst. Im folgenden erfolgt ein Review über den Einfluß von Temperatur und Feuchte auf die Überwinterung, sowie den Einfluß des Windes auf die Verbreitung. KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Deutschland ; 1949-1953 ; Kartoffeln ; Pflanzenkrankheit ; Hackfrüchte
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  • 4
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    Aerodynamic forces, moments, and stability derivatives for slender bodies of general cross section (1954)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Keywords: AERODYNAMICS
    Type: NACA-TN-3283
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  • 5
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    Effect of Ice Formations on Section Drag of Swept NACA 63A-009 Airfoil with Partial-Span Leading-Edge Slat for Various Modes of Thermal Ice Protection (1954)
    In:  CASI
    Details
    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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  • 6
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    A flight investigation of the practical problems associated with porous-leading-edge suction (1954)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Keywords: AERODYNAMICS
    Type: NASA-TM-79864 , NACA-TN-3062
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  • 7
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    A theoretical study of the effect of forward speed on the free-space sound-pressure field around propellers (1954)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Keywords: AERODYNAMICS
    Type: NASA-TM-79844 , NACA-TR-1198 , NACA-TN-3018
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  • 8
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    Was wissen wir von der Blattfleckenkrankheit der Rübe (Cercospora beticola Sacc.) (1951)
    In:  Neue Mitt. Landwirtsch., p. 395-396
    Details
    Publication Date: 1951
    Description: Verbale Beschreibung des bisherigen Wissens über die Blattfleckenkrankheit und deren Erreger KATASTER-BESCHREIBUNG: Zusammenhang zwischen Witterung (Temperatur, Luftfeuchte) und dem Auftreten der Krankheit KATASTER-DETAIL: Delta T (Sommer) + und Delta Nied (Sommer) +, dann Auftreten von Cercospora +; Delta Relf +, dann Anzahl und Größe der Konidien +; Relf 〉 98%, dann Keimung der Konidien; Delta T: 20°C 〈 T 〈 30°C, dann schnellste Keimung der Konidien; 25°C 〈 T 〈 30°C, dann optimales Wachstum des Myzels; °C 〉 T 〈 40°C, dann kein Wachstum des Myzels
    Keywords: Deutschland ; 1950 ; Zuckerrüben ; Pflanzenkrankheit ; Temperatur ; Witterung
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  • 9
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    Method for estimating lift interference of wing-body combinations at supersonic speeds (1951)
    In:  CASI
    Details
    Publication Date: 2019-05-30
    Description: Estimating method for lift interference of wing- body combinations at supersonic speeds
    Keywords: AERODYNAMICS
    Type: NACA-RM-A51J04
    Format: application/pdf
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  • 10
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    Theoretical Investigation of Submerged Inlets at Low Speeds (1951)
    In:  CASI
    Details
    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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  • 11
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    Blockage Corrections for Three-Dimensional-Flow Closed-Throat Wind Tunnels, with Consideration of the Effect of Compressibility (1951)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: Theoretical blockage corrections are presented for a body of revolution and for a three-dimensional, unswept wing in a circular or rectangular wind tunnel. The theory takes account of the effects of the wake and of the compressibility of the fluid, and is based on the assumption that the dimensions of the model are small in comparison with those of the tunnel throat. Formulas are given for correcting a number of the quantities, such as dynamic pressure and Mach number, measured in wind tunnel tests. The report presents a summary and unification of the existing literature on the subject
    Keywords: AERODYNAMICS
    Type: NACA-TR-995
    Format: application/pdf
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