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  • 1926  (7)
  • AERODYNAMICS
  • Aerodynamics
  • Animals
  • EARTH RESOURCES AND REMOTE SENSING
  • 1980-1984
  • 1955-1959
  • 1925-1929  (10)
  • 1926  (10)
Collection
Years
  • 1980-1984
  • 1955-1959
  • 1925-1929  (10)
Year
  • 1
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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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  • 2
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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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  • 3
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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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  • 4
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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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  • 5
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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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  • 6
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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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  • 7
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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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  • 8
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    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
    Format: application/pdf
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  • 9
    Publication Date: 2019-06-28
    Description: This report is based on a study made by the writer as a member of the Special Committee on Design of Army Semirigid Airship RS-1 appointed by the National Advisory Committee for Aeronautics. The increasing interest in airships has made the problem of the potential flow of a fluid about an ellipsoid of considerable practical importance. In 1833 George Green, in discussing the effect of the surrounding medium upon the period of a pendulum, derived three elliptic integrals, in terms of which practically all the characteristics of this type of motion can be expressed. The theory of this type of motion is very fully given by Horace Lamb in his "Hydrodynamics," and applications to the theory of airships by many other writers. Tables of the inertia coefficients derived from these integrals are available for the most important special cases. These tables are adequate for most purposes, but occasionally it is desirable to know the values of these integrals in other cases where tabulated values are not available. For this reason it seems worth while to assemble a collection of formulae which would enable them to be computed directly from standard tables of elliptic integrals, circular and hyperbolic functions and logarithms without the need of intermediate transformations. Some of the formulae for special cases (elliptic cylinder, prolate spheroid, oblate spheroid, etc.) have been published before, but the general forms and some special cases have not been found in previous publications. (author)
    Keywords: Aerodynamics
    Type: NACA-TR-210
    Format: application/pdf
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  • 10
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    In:  CASI
    Publication Date: 2019-06-28
    Description: The design of complicated structures often presents problems of extreme difficulty which are frequently insoluble. In many cases, however, the solution can be obtained by tests on suitable models. These model tests are becoming so important a part of the design of new engineering structures that their theory has become a necessary part of an engineer's knowledge. For balloons and airships water models are used. These are models about 1/30 the size of the airship hung upside down and filled with water under pressure. The theory shows that the stresses in such a model are the same as in the actual airship. In the design of the Army Semirigid Airship RS-1 no satisfactory way was found to calculate the stresses in the keel due to the changing shape of the bag. For this purpose a water model with a flexible keel was built and tested. This report gives the theory of the design, construction, and testing of such a water model.
    Keywords: Aerodynamics
    Type: NACA-TR-211
    Format: application/pdf
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