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  • Other Sources  (14)
  • Structural Mechanics  (8)
  • Ertrag  (6)
  • 1940-1944  (14)
  • 1
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    Ungewöhnliche Spätfrostschäden an Fichte und Kiefer (1944)
    In:  Forstwiss. Centralbl. Thar. forstl. Jahrb. 66: 115-120
    Details
    Publication Date: 1944
    Description: Beschreibung des Ertragsrückgang und der Schäden durch die Spätfröste im Mai 1943 KATASTER-BESCHREIBUNG: Spätfröste verursachten Schäden an Kiefern, Maitriebbildung teilweise extrem gestört und Posthorn- oder kandelaberartige Triebbildung als Folge des Frostes, unterschiedliche Empfindlichkeit der Baumarten KATASTER-DETAIL: Delta T -, (Ende Mai 〈 -6°C), dann schwere Schäden an Walnuss, Eiche, Robinie, Roteiche, Esche, Tanne, mittlere Schiiden:Buche, Roterle, Ahorn, Fichte, Douglasie, Lärche; geringe Schiiden: Roflkastanie,Hainbuche, Linde, Weisserle, Ulme, Birke. Im allgemeinen blieben ohne Schäden: Aspe, Eberesche, Traubenkirsche, Kiefer, Strobe und Bankskiefer.
    Keywords: Nordostdeutschland ; 1943 ; Buche ; Eiche ; Ertrag ; Fichte ; Forst ; Kiefer ; Roterle ; Frost ; Ulme ; Rosskastanie
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  • 2
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    Compressive Strength of Flat Panels with Z- and Hat-Section Stiffeners (1944)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Compression tests were conducted on 247 panels with Z-section stiffeners and 304 panels with hat-section stiffeners. Specimens were constructed from artificially aged Alclad 24S aluminum alloy with minimum guaranteed yield strengths of 64 and 57 ksi for stiffeners and sheet materials, respectively. Height, thickness, and spacing of stiffeners, sheet thickness, and length of specimens were varied systematically to show effects of changes in these dimensions on panel strength. Results show average stresses at buckling load and maximum load.
    Keywords: Structural Mechanics
    Type: NACA-WR-L-62 , NACA-ARR-L4F01
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  • 3
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    Witterung und Obstertrag (1943)
    In:  Gartenbauwissenschaft Bd. 17, S.603-615
    Details
    Publication Date: 1943
    Description: Einfluss der Temperatur und des Niederschlages auf den Ernteertrag von Birnen und Äpfeln KATASTER-BESCHREIBUNG: Durch Berechnung von Kennziffern zu Wirkung des Sommerregens auf den Obstertrag wird die Bedeutung der Niederschläge in bestimmten Monaten des Vor- und des Erntejahres bestimmt KATASTER-DETAIL: Nied+(Oktober des Vorjahres) und Nied+ (Juli des Erntejahres), dann hohe Erträge von Äpfeln und Birnen
    Keywords: Holstein ; 1916-1935 und 1921-1941 ; Apfel ; Ertrag ; Korrelationsmethode ; Niederschlag ; Rangordnungsmethode ; Temperatur ; Birne
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  • 4
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    Landwirtschaftlich beachtliche Windwirkung und Windschutz in der Landwirtschaft. (1943)
    In:  Kulturtechniker, Berlin 46:19-41.
    Details
    Publication Date: 1943
    Description: Bedeutung und Wirkung des Windschutzes auf Anbauart, Fruchtfolge, Gare- und Bodenpflege, Schlageinteilung, Verdunstung, Deck-, Schutz-, Mischfrucht- und Streifenanbau KATASTER-BESCHREIBUNG: Einfluss von Windschutz auf den Ertrag KATASTER-DETAIL: Windschutz +, dann Delta T(Tag) + und Delta T(Nacht)-; Windschutz +, dann Delta Relf +; Windschutz +, dann Verdunstung -; Windschutz +, dann Bodenerosion -; Windschutz +, dann Schneeanhäufung +; angepasste Bodenbearbeitung (schollige, klumpige Bodenoberfläche), dann Wasserhaltungsfähigkeit + -〉 Windschutz +, dann Ertragserhöhung + bzw. ++ (3-400%; ++: Körnerfrüchte auf 20-25vH, Rüben, Gräser, Leguminosen; +: Sommergetreide, Hafer )
    Keywords: weltweit ; letzten100 Jahre ; Boden ; Ertrag ; Niederschlag ; Temperatur ; Verdunstung ; Wind ; Frost
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  • 5
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    Zusammenhänge zwischen Jahreswitterung, Düngung und Erträgen im Dikopshofer Dauerversuch (1942)
    In:  Landwirtschaftl. Jahrbuch 68:642-686
    Details
    Publication Date: 1942
    Description: Ableitung kritischer Faktoren (Temperaturoptima und Wasserversorgung) in einzelnen Wachstumsstadien KATASTER-BESCHREIBUNG: Zusammenhang zwischen Temperaturänderung während der Blüte von Weizen und dem Ertrag KATASTER-DETAIL: Delta T + und -: Tmit von 14-15°C, Änderung um +1 K auf 16°C, aber auch Rückgang um 2K auf 13°C, dann Rückgang des Ertrages
    Keywords: Kölner Bucht ; 1907-37 ; Boden ; Ertrag ; Korrelationsmethode ; Niederschlag ; Roggen ; Temperatur ; Weizen ; Witterung ; Düngung ; Hackfrüchte
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  • 6
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    Ein Verfahren zur statistischen Untersuchung der Abhängigkeit der Ernteerträge von Standort und klimatischen Faktoren. Forschungsdienst 13:301. (1942)
    In:  Forschungsdienst 13:301.
    Details
    Publication Date: 1942
    Description: Betrachtung des Klimas (Temperatur und Niederschlag) in Dekaden und Bildung von Ertrags-, Temperatur- und Niederschlagsklassen und daraus Ableitungen über die Beziehungen Ertrag und Witterung KATASTER-BESCHREIBUNG: Einfluss der Witterung (Temperatur, Niederschlag) auf den Ertrag KATASTER-DETAIL: Delta T (März) + und Delta Nied (März) +, dann Erträge +; Delta T (April -, dann Erträge +; Delta Nied (Ende Juni,Ende Juli)-, dann Erträge + Delta T (Anfang Juli) +, dann Erträge +
    Keywords: Schlesien ; 1926-38 ; Boden ; Ertrag ; Niederschlag ; Weizen ; Witterung
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  • 7
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    Eine Darstellung der ursächlichen Wechselbeziehungen zwischen Witterungsverlauf und Bodenzustand in ihren Auswirkungen auf Pflanzenwuchs und Ernte (1942)
    In:  Klima / Boden / Ernte Verlag C.V. Engelhard, Berlin. p. 7, 114-127
    Details
    Publication Date: 1942
    Description: Beziehung zwischen Witterungsablauf und Bodenzustand und deren Auswirkung auf Pflanzenwuchs und Ernte KATASTER-BESCHREIBUNG: Einfluss der Witterung auf den Ertrag von Kartoffeln KATASTER-DETAIL: Delta T (April bis Juli) -, dann Erträge (Kartoffel) +; Delta Nied (April bis Juli) -, dann Erträge (Kartoffel) -
    Keywords: Gesamtpreußen, Deutschland,Schlesien ; 1921-1932,1934 ; Zuckerrüben ; Kartoffeln ; Ertrag ; Hafer ; Landwirtschaft ; Niederschlag ; Temperatur ; Witterung ; Hackfrüchte
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  • 8
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    Bending of Rectangular Plates with Large Deflections (1942)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The solution of von Karman's fundamental equations for large deflections of plates is presented for the case of a simply supported rectangular plate under combined edge compression and lateral loading. Numerical solutions are given for square plates and for rectangular plates with a width-span ratio of 3:1. The effective widths under edge compression are compared with effective widths according to von Karman, Bengston, Marguerre, and Cox and with experimental results by Ramberg, McPherson, and Levy. The deflections for a square plate under lateral pressure are compared with experimental and theoretical results by Kaiser. It is found that the effective widths agree closely with Marguerre's formula and with the experimentally observed values and that the deflections agree with the experimental results and with Kaiser's work.
    Keywords: Structural Mechanics
    Type: NACA-TN-846
    Format: application/pdf
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  • 9
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    Restraint Provided a Flat Rectangular Plate by a Sturdy Stiffener Along an Edge of the Plate (1942)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A sturdy stiffener is defined as a stiffener of such proportions that it does not suffer cross-sectional distortion when moments are applied to some part of the cross section. When such a stiffener is attached to one edge of a plate, it will resist rotation of that edge of the plate by means of its torsional properties. A formula is given for the restraint coefficient provided the plate by such a stiffener. This coefficient is required for the calculation of the critical compressive stress of the plate.
    Keywords: Structural Mechanics
    Type: NACA-TR-735
    Format: application/pdf
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  • 10
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    A Flush-Rivet Milling Tool (1942)
    In:  CASI
    Details
    Publication Date: 2018-06-05
    Description: The investigation of machine-countersunk flush rivets for aircraft described in reference 1 revealed the necessity of having the height of the rivet heads greater than the depth of the countersunk holes if tightly riveted joints were to be obtained. If ordinary roundhead rivets were inserted from the opposite side of the joint and the countersunk heads formed in the driving of the rivets filled the countersunk holes completely, still tighter joints were obtained. In either case the rivets protruded above the skin surface after driving, and the protruding portion of the rivet heads had to be removed in order to obtain flush rivets. A number of requests have been received for a description of the tool used to mill off the protruding portion of the rivet heads. This report contains assembly and detail drawings of the latest flush-rivet milling tool used at the NACA Structures Research Laboratory. Figure 6 shows the tool in operation. This tool is quite satisfactory for 1/8-inch rivets, but a more powerful motor is recommended for use with larger rivets.
    Keywords: Structural Mechanics
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  • 11
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    Data on Compressive Strength of Flat Panels with Z-Section Stiffeners (1942)
    In:  CASI
    Details
    Publication Date: 2018-06-05
    Description: A comprehensive series of compression tests on skin-stiffener panels with Z-section stiffeners formed from flat sheet is being made in order to show the importance of the relative dimensions in determining the strength of the panels. The results obtained to date in this investigation are presented in this report.
    Keywords: Structural Mechanics
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  • 12
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    Stress Analysis of Circular Frames (1941)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The stresses in circular frames of constant bending stiffnesses, as encountered in thin-wall shells, are investigated from the point of view of finite depth of sectional area of frame. The solution is carried out for four fundamental load conditions. The method is illustrated on a worked out example.
    Keywords: Structural Mechanics
    Type: NACA-TM-999
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  • 13
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    Restraint Provided a Flat Rectangular Plate by a Sturdy Stiffener Along an Edge of the Plate, Special Report (1941)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A sturdy stiffener is defined as a stiffener of such proportions that it does not suffer cross-sectional distortion when moments are applied to some part of the cross section. When such a stiffener is attached to one edge of a plate, it will resist rotation of that edge of the plate by means of its torsional properties. A formula is given for the restraint coefficient provided the plate by such a stiffener. This coefficient is required for the calculation of the critical compressive stress of the plate.
    Keywords: Structural Mechanics
    Type: NACA-SR-190
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  • 14
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    The Effect of Initial Displacement of the Center Support on the Buckling of a Column Continuous over Three Supports (1940)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The test indicate that "an indiscriminate single application of the Southwell method (for analyzing Exp. Observations in problems of elastic stability)--can result in definite and measurable errors" The test also indicate "that the effect of curvature due to bending on the critical load for the compression flange material of a box beam is probably small and can be neglected." We have not found this to be true in our tests. It is believed that the effect of curvature, together with a small amount of fixity at the ribs, tends to force the stiffeners to bow in each bay thus effectively increasing their end fixity and thereby raising their allowable loads.
    Keywords: Structural Mechanics
    Type: NACA-SR-166
    Format: application/pdf
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