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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 47 (1925), S. 1147-1158 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 56 (1974), S. 50-54 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents For a multidimensional system to produce the electric wind a relation is given between the velocity of wind and the parameters of the corona discharge. Techniques are indicated for measuring electrical field strength and space charge density necessary to calculate the velocity of wind. It is shown that in a “point to ring system” a higher velocity is obtained than with the system of multiple point electrodes.
    Notes: Übersicht Für eine mehrdimensionale Anordnung zur Erzeugung des elektrischen Windes wird cine Bezichung zwischen Windgeschwindigkeit und Koronaparametern abgeleitet. Außerdem werden Verfahren angegeben, um die für die Berechnung der Windgeschwindigkeit notwendige Feldstärke und Raumladungsdichte zu messen. Die Geschwindigkeitssteigerung in einer Spitze-Ring-Anordnung gegenüber einer Elektrodenrasteranordnung wird erklärt.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 57 (1975), S. 55-58 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents By cascading single stages velocity and power efficiency of the electric wind can be increased. Cascade velocity and power efficiency are calculated and results of cascade testing communicated.
    Notes: Übersicht Durch Hintereinanderschaltung von Einzelstufen zu einer Kaskade läßt sich die Geschwindigkeit und der Wirkungsgrad des elektrischen Windes steigern. Kaskadengeschwindigkeit und Wirkungsgrad werden berechnet und experimentelle Ergebnisse an Kaskaden mitgeteilt.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Aspects of the population biology of two harpacticoid copepod species [Zausodes arenicolus Wilson and Paradactylopodia brevicornis (Claus)] living in Tampa Bay, Florida, USA, were studied on time scales of hours to days during November 1983. Fluctuations in population agestructure, adult sex-ratio, and proportion of ovigerous females were determined for these two species in a control plot and in an experimental plot defaunated by raking. For both species, immigrants into the defaunated plot differed significantly from conspecifics in the control plot in all characteristics examined. The disturbed plot contained a larger proportion of young juveniles of both species compared to the unmanipulated site after 4 h but not after 8 h. In Z. arenicolus, adult males returned to the experimental plot more quickly than adult females. For both species, rapid and significant changes in population age-structure, adult sex-ratio, and the proportion of adult females with eggs occurred within the control plot. It is suggested that this variation was too large and occurred too rapidly to be accounted for solely by in situ processes in the absence of large-scale immigration and/or emigration of individuals. Potential implications of these results for population studies of harpacticoid copepods and other benthic invertebrates are discussed.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Denitrification processes were measured by the acetylene-blockage technique under changing flood conditions along the aquatic/terrestrial transition zone on the Amazon floodplain at Lago Camaleão, near Manaus, Brazil. In flooded sediments, denitrification was recorded after the amendment with NO 3 − (100 μmol liter−1) throughout the whole study period from August 1992 to February 1993. It ranged from 192.3 to 640.7 μmol N m−2 h−1 in the 0- to 5-cm sediment layer. Without substrate amendment, denitrification was detected only during low water in November and December 1992, when it occurred at a rate of up to 12.2 μmol N m−2 h−1 Higher rates of denitrification at an average rate of 73.3 μmol N m−2 h−1 were measured in sediments from the shallow lake basin that were exposed to air at low water. N2O evolution was never detected in flooded sediments, but in exposed sediments, it was detected at an average rate of 28.3 μmol N m−2 h−1 during the low-water period. The results indicate that under natural conditions there is denitrification and hence a loss in nitrogen from the Amazon floodplain to the atmosphere. Rates of denitrification in flooded sediments were one to two orders of magnitude smaller than in temperate regions. However, the nitrogen removal of exposed sediments exceeded that of undisturbed wetland soils of temperate regions, indicating a considerable impact of the flood pulse on the gaseous turnover of nitrogen in the Amazon floodplain.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. Denitrification processes were measured by the acetylene-blockage technique under changing flood conditions along the aquatic/terrestrial transition zone on the Amazon floodplain at Lago Camaleão, near Manaus, Brazil. In flooded sediments, denitrification was recorded after the amendment with NO3 − (100 μmol liter−1) throughout the whole study period from August 1992 to February 1993. It ranged from 192.3 to 640.7 μmol N m−2 h−1 in the 0- to 5-cm sediment layer. Without substrate amendment, denitrification was detected only during low water in November and December 1992, when it occurred at a rate of up to 12.2 μmol N m−2 h−1. Higher rates of denitrification at an average rate of 73.3 μmol N m−2 h−1 were measured in sediments from the shallow lake basin that were exposed to air at low water. N2O evolution was never detected in flooded sediments, but in exposed sediments, it was detected at an average rate of 28.3 μmol N m−2 h−1 during the low-water period. The results indicate that under natural conditions there is denitrification and hence a loss in nitrogen from the Amazon floodplain to the atmosphere. Rates of denitrification in flooded sediments were one to two orders of magnitude smaller than in temperate regions. However, the nitrogen removal of exposed sediments exceeded that of undisturbed wetland soils of temperate regions, indicating a considerable impact of the flood pulse on the gaseous turnover of nitrogen in the Amazon floodplain.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Heat and mass transfer 13 (1980), S. 205-215 
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Zum Vergleich der Leistungsfähigkeit verschiedener Wärmeaustauscher liegt aus der Literatur eine Reihe von Bewertungskriterien vor. Sie beruhen im wesentlichen auf dem Verhältnis von erzielter Wärmeaustauschleistung zu der dafür erforderlichen hydraulischen Förderleistung. Die Anwendung dieser Kriterien wird beeinträchtigt durch nicht oder unklar formulierte Randbedingungen, die der Bewertung zugrunde liegen. Dies hat zu widersprüchlichen oder quantitativ zweifelhaften Ergebnissen geführt. Hier werden die Randbedingungen verschiedener Bewertungsverfahren gegenübergestellt, wobei die beiden Fragestellungen nach Flächenbedarf bei gleicher Wärme- und Förderleistung sowie Flächenbedarf und Förderleistung bei gleicher Wärmeleistung und Anströmfläche als die wichtigsten angesehen werden. Die erste Frage ist von Glaser bereits beantwortet worden, wird hier jedoch verallgemeinert dargestellt, die zweite Fragestellung ist neu; sie wird mit Hilfe geeigneter Kenngrößen und für einige bekannte Austauschsysteme behandelt.
    Notes: Abstract A number of criteria have been developed which evaluate heat exchangers on the basis of exchange rate and pumping power. Appreciation of these criteria suffers from a poor discussion of the conditions for which the evaluation holds. Consequently there have been contradictory results when different procedures were applied. A thorough discussion of the various boundary conditions reveals that two most important questions for crossflow air-cooled heat exchangers are (i) exchange area requirement at constant heat transfer rate and pumping power and (ii) exchange area and pumping power requirement at constant heat transfer rate and frontal area. The first question can be answered by generalizing the evaluation procedure of Glaser, the second problem is dealt with on the basis of redefined heat transfer and pressure drop characteristics.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 966-974 
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: It has been observed that the reflectivity of the (110) planes of a quartz lamina can be increased by submitting it to a static or alternating electric field. Measurements have been performed on 2.5 and 6 mm thick plates using a curved-crystal spectrometer with DuMond geometry. Photon energies were in the range 50 to 300 keV. Under the proper conditions, the increase in reflectivity is accompanied by negligible loss in resolution. The effects are explained by the occurrence of a quasi-mosaicity.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 557 (1989), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0375-9474
    Keywords: Nuclear reactions
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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