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  • 1950-1954  (13)
  • 1940-1944  (18,777)
  • 1944  (18,777)
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  • 1
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    Unknown
    In:  Leidse Geologische Mededelingen vol. 14 no. 1, pp. 10-39
    Publication Date: 2024-01-12
    Description: De koralenfauna van het Tertiair van Nederland was tot nu toe zeer onvolledig bekend. Krejci (1925) noemde het voorkomen van Flabellum cristatum, Fl. Pompeckji en Fl. Waelii, var. Dingdenensis van de Giffel bij Winterswijk en van Fl. Waelii van Maasbree. Vervolgens noemde Burck (1937) uit het Bartonien van Buurse en Boekelo een drietal koralen. Dit is alles wat ik aan gegevens over Nederlandsche koralen uit het Tertiair in de nieuwere literatuur heb kunnen vinden.\nNaast de, vaak zeer rijke, molluskenfauna van het Tertiair spelen de koralen dan ook een ondergeschikte rol en de meeste vormen zijn als gidsfossiel bovendien slecht te gebruiken, daar ze zich haast onveranderd in de verschillende formaties voortzetten. Vooral door het optreden van vele Flabellumsoorten heeft de rijke midden-miocene koralenfauna wel een zeer eigen beeld.
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 2
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    Unknown
    In:  Leidse Geologische Mededelingen vol. 14 no. 1, pp. 1-9
    Publication Date: 2024-01-12
    Description: Das am 21. November 1942 im beinahe vollendeten 92. Lebensjahr erfolgte Dahinscheiden des um die geologische Erforschung der niederl\xc3\xa4ndischen Kolonien in Ost- und Westindien so hoch verdienten Gelehrten veranlasst mich in dieser Zeitschrift, die ja die Fortsetzung der von Martin gegr\xc3\xbcndeten \xe2\x80\x9eSammlungen des Geologischen Reichsmuseum\xe2\x80\x9d ist, noch einmal auf die wissenschaftliche Bedeutung seines Lebenswerkes zur\xc3\xbcckzukommen. Die erfolgreiche T\xc3\xa4tigkeit Martin\xe2\x80\x99s als Dozent und Direktor des Reichsmuseum f\xc3\xbcr Geologie und Mineralogie ist in der, anl\xc3\xa4sslich seines 80. Geburtstages herausgegebenen Festschrift 1) schon eingehend gew\xc3\xbcrdigt worden, auf seine wissenschaftliche T\xc3\xa4tigkeit wurde bei dieser Gelegenheit nur kurz hingewiesen, sie war damals ja noch nicht abgeschlossen.\nWaren es auch namentlich die gr\xc3\xbcndlichen Untersuchungen und eingehenden Beschreibungen der Mollusken aus dem Terti\xc3\xa4r von Java, die Martin bei den Pal\xc3\xa4ontologen der ganzen Welt bekannt gemacht haben, so war er doch keineswegs nur Molluskenspezialist. Wir sehen, dass seine Aufs\xc3\xa4tze in den Sammlungen die Untersuchungen von Fossilien aus fast allen Tiergruppen und den verschiedensten Formationen des indischen Archipel enthalten und h\xc3\xa4ufig waren die darauf gegr\xc3\xbcndeten Altersbestimmungen f\xc3\xbcr die weitere geologische Erforschung der betreffenden Gebiete grundlegend. Martin war aber ebensowenig wie ausgesprochener Molluskenspezialist auch nur Pal\xc3\xa4ontologe. 1884 unternahm er mit einigen holl\xc3\xa4ndischen Forschern eine Reise nach Westindien. Die ersten geologischen Karten von Cura\xc3\xa7ao, Bonaire und Aruba, sowie eine geologische Aufnahme des unteren Suriname in niederl\xc3\xa4ndisch Guyana waren die wesentlichen Ergebnisse dieser Reise. 1891/92 befand sich Martin auf einer geologischen Forschungsreise in Ostindien, wo er namentlich einige Inseln der westlichen Molukken erforschte, die geologisch damals noch ganz unbekannt waren. Eine besondere Leistung, f\xc3\xbcr die damalige Zeit war seine Durchquerung der Insel Buru, deren Ergebnisse lange Zeit unser einziges Wissen vom geologischen Bau dieser Insel darstellten. So kann Martin mit Recht zu den Pionieren in der geologischen Erforschung des Indischen Archipels gerechnet werden.
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 3
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    Unknown
    In:  Leidse Geologische Mededelingen vol. 14 no. 1, pp. 40-58
    Publication Date: 2024-01-12
    Description: An upper molar of Anancus arvernensis (Croiz. & Job.), fished out of the Eastern Scheldt, near Ierseke, and belonging to the so-called black fossils, shows more affinity with the specimens from the English Crags than with those from Th\xc3\xbcringen. Another upper molar of the species has been dredged out of the Lower-Rhine.\nA lower molar of Archidiskodon planifrons (Falc. & Caut.) from the same locality as the first-named tooth, and displaying the same kind of fossilization has most probably been washed out of the same deposit. Also in other parts of Europe the two animals lived together in the Upper-Pliocene, prae-G\xc3\xbcnzian period. Marine Amstelian deposits being absent in the greater part of Zealand, it is highly probable that a fauna of landmammals to which also both Proboscidea, belong, thus resembling other Lower-Villafranchian faunas like those of Italy, Auvergne and the English Red Crag, also lived in Zealand when this region emerged above the sea.
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 4
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    Unknown
    PANGAEA
    In:  Supplement to: Revelle, Roger (1944): Marine bottom samples collected in the Pacific Ocean by the Carnegie on its seventh cruise. In: Scientific Results of Cruise VII of the CARNEGIE during 1928-1929 under Command of Captain J. P. Ault, Oceanography. Carnegie Institution of Washington, Washington D.C., USA, 180 pp, https://archive.org/details/imarinebottomsam00carn
    Publication Date: 2023-08-28
    Description: The Carnegie, on its seventh cruise and last cruise, collected seventy-five samples of deep-sea deposits in the southeastern and the north Pacific. This report contains an account of the general character of the deep-sea samples collected and of the distribution of the various deposit types, together with the results of chemical, mechanical, X-ray, and other types of analyses. As indicated in the text, many of the analyses were carried out in whole or in part by other investigators.
    Keywords: CARN_Revelle_10; CARN_Revelle_11; CARN_Revelle_15; CARN_Revelle_17; CARN_Revelle_22; CARN_Revelle_24; CARN_Revelle_46; CARN_Revelle_47; CARN_Revelle_57; CARN_Revelle_67; CARN_Revelle_70; CARN_Revelle_71; CARN_Revelle_72; CARN_Revelle_75; CARN_Revelle_77; CARN_Revelle_78; CARN_Revelle_79; CARN_Revelle_81; CARN_Revelle_82; CARN7-115; CARN7-134; CARN7-137; CARN7-138; CARN7-142; CARN7-147; CARN7-149; CARN7-150; CARN7-151; CARN7-156; CARN7-157; CARN7-37; CARN7-40; CARN7-46; CARN7-49; CARN7-59; CARN7-61; CARN7-86; CARN7-87; CARN-Cruise7; Carnegie; Comment; Deposit type; DEPTH, sediment/rock; Description; Dredge; DRG; Event label; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Pacific Ocean; Position; Quantity of deposit; Sample ID; Sediment type; Size; Substrate type; Visual description
    Type: Dataset
    Format: text/tab-separated-values, 151 data points
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  • 5
    Journal available for loan
    Journal available for loan
    Tübingen : Mohr Siebeck ; 1.1884 - 48.1931; N.F. 1.1932/33 - 10.1943/44(1945),3; 11.1948/49(1949) -
    Call number: ZS 22.95039
    Type of Medium: Journal available for loan
    Pages: Online-Ressource
    ISSN: 1614-0974 , 0015-2218 , 0015-2218
    Language: German , English
    Note: N.F. entfällt ab 57.2000. - Volltext auch als Teil einer Datenbank verfügbar , Ersch. ab 2000 in engl. Sprache mit dt. Hauptsacht.
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  • 6
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    Poeschel & Trepte
    In:  Veröffentlichung des Geodätischen Institutes
    Publication Date: 2020-02-12
    Language: German
    Type: info:eu-repo/semantics/report
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  • 7
    Publication Date: 2019-08-17
    Description: Theoretical investigations have shown that, because air is compressible, the pressure-drop requirements for cooling an air-cooled engine will be much greater at high altitudes and high speeds than at sea level and low speeds. Tests were conducted by the NACA to obtain some experimental confirmation of the effect of air compressibility on cooling and pressure loss of a baffled cylinder barrel and to evaluate various methods of analysis. The results reported in the present paper are regarded as preliminary to tests on single-cylinder and multi-cylinder engines. Tests were conducted over a wide range of air flows and density altitudes.
    Keywords: Aircraft Propulsion and Power
    Type: NACA-TR-783
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  • 8
    Publication Date: 2019-08-16
    Description: An analysis is made of the stability of an airplane with ailerons free, with particular attention to the motions when the ailerons have a tendency to float against the wind. The present analysis supersedes the aileron investigation contained in NACA Report No. 709. The equations of motion are first written to include yawing and sideslipping, and it is demonstrated that the principal effects of freeing the ailerons can be determined without regard to these motions. If the ailerons tend to float against the wind and have a high degree of aerodynamic balance, rolling oscillations, in addition to the normal lateral oscillations, are likely to occur. On the basis of the equations including only the rolling motion and the aileron deflection, formulas are derived for the stability and damping of the rolling oscillations in terms of the hinge moment derivatives and other characteristics of the ailerons and airplane. Charts are also presented showing the oscillatory regions and stability boundaries for a fictitious airplane of conventional proportions. The effects of friction in the control system are investigated and discussed. If the ailerons tend to trail with the wind, the condition for stable variation of stick force with aileron deflection is found to determine the amount of aerodynamic balance that may be used. If the ailerons tend to float against the wind, the period and damping of the rolling oscillations are found to be satisfactory (in a mass-balanced system) so long as the restoring moment is not completely balanced out. Unbalanced mass behind the hinge, however, has an unfavorable effect on the damping of the oscillations and so shifts the boundary that close aerodynamic balance may not be attainable.
    Keywords: Aircraft Design, Testing and Performance
    Type: AD-A301275 , NACA-TR-787 , NASA-TM-111361 , NAS 1.15:111361
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  • 9
    Publication Date: 2019-08-15
    Description: The differential equation of Chaplygin's jet problem is utilized to give a systematic development of particular solutions of the hodograph flow equations, which extends the treatment of Chaplygin into the supersonic range and completes the set of particular solutions. The particular solutions serve to place on a reasonable basis the use of velocity correction formulas for the comparison of incompressible and compressible flows. It is shown that the geometric-mean type of velocity correction formula introduced in part I has significance as an over-all type of approximation in the subsonic range. A brief review of general conditions limiting the potential flow of an adiabatic compressible fluid is given and application is made to the particular solutions, yielding conditions for the existence of singular loci in the supersonic range. The combining of particular solutions in accordance with prescribed boundary flow conditions is not treated in the present paper.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA/TR-790
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  • 10
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    Unknown
    In:  CASI
    Publication Date: 2019-08-15
    Description: A brief summary of the contents of this paper is presented here. In part I the differential equations of the problem of a gas flow in two dimensions is derived and the particular integrals by which the problem on jets is solved are given. Use is made of the same independent variables as Molenbroek used, but it is found to be more suitable to consider other functions. The stream function and velocity potential corresponding to the problem are given in the form of series. The investigation on the convergence of these series in connection with certain properties of the functions entering them forms the subject of part II. In part III the problem of the outflow of a gas from an infinite vessel with plane walls is solved. In part IV the impact of a gas jet on a plate is considered and the limiting case where the jet expands to infinity changing into a gas flow is taken up in more detail. This also solved the equivalent problem of the resistance of a gaseous medium to the motion of a plate. Finally, in part V, an approximate method is presented that permits a simpler solution of the problem of jet flows in the case where the velocities of the gas (velocities of the particles in the gas) are not very large.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-TM-1063 , Scientific Memoirs; 1-121
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