ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Short-term temporal variation in population structure of two harpacticoid copepods, Zausodes arenicolus and Paradactylopodia brevicornis (1984)
    Springer
    Marine biology 84 (1984), S. 53-63 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00394527
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Messunǵ und Berechnunǵ des elektrischen Windes in einer Koronaentladunǵ (1974)
    Springer
    Electrical engineering 56 (1974), S. 50-54 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF01441219
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Untersuchungen über Kaskaden zur Erzeugung hoher Geschwindigkeiten des elektrischen Windes (1975)
    Springer
    Electrical engineering 57 (1975), S. 55-58 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF01574141
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Positron lifetimes for neutron-irradiated C60 (1995)
    Springer
    Applied physics 61 (1995), S. 335-337 
    Details
    ISSN: 1432-0630
    Keywords: 61.80 ; 78.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The neutron-irradiation effects on C60 fullerite powder were studied by positron lifetime spectroscopy. Below 0.5 ns, a single lifetime of 382±1 ps was found for the unirradiated annealed sample and two components were resolved after neutron irradiation with a dose of 2×1016 n/cm2. Possible origins of these components are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538200
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Positron lifetimes for neutron-irradiated C $_{60}$ (1995)
    Springer
    Applied physics 61 (1995), S. 335-337 
    Details
    ISSN: 1432-0630
    Keywords: PACS61.80; 78.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. The neutron-irradiation effects on C $_{60}$ fullerite powder were studied by positron lifetime spectroscopy. Below 0.5 ns, a single lifetime of $382\pm1$ ps was found for the unirradiated annealed sample and two components were resolved after neutron irradiation with a dose of $2\times 10^{16}$ n/cm $^2$ . Possible origins of these components are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538200
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    On the feasibility of heat-exchange processes in uninsulated equipment (1976)
    Springer
    Heat and mass transfer 9 (1976), S. 267-272 
    Details
    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 Wegen des grundsätzlich immer vorhandenen Wärmeaustausches mit der Umgebung ist der gewöhnliche Zweistoff-Wärmeaustauscher als Sonderform des Dreistoff-Wärmeaustauschers aufzufassen. In zahlreichen Situationen führt der Umgebungseinfluß zu merklich vergrößerten oder reduzierten Austauschflächen, je nach dem Zweck des Prozesses. Darüberhinaus läßt sich eine gewünschte Temperaturänderung unter gewissen Bedingungen überhaupt nicht mehr erreichen. Für einige typische Stromführungen werden diese Bedingungen hergeleitet; damit kann man direkt und ohne größeren Rechenaufwand feststellen, ob und für welche Parameterkombinationen ein angestrebter Austauschprozess realisierbar ist.
    Notes: Abstract Strictly speaking, the common two-fluid heat exchanger is a special version of a three-fluid exchanger because the environment also participates in the energy exchange. In a number of situations this effect is significant and leads to either reduced or increased area requirements, depending on the purpose of the exchange operation. With certain combinations of the system parameters it is even impossible to achieve an envisaged temperature change. For some typical flow arrangements these combinations are established in an analytic form so that one can rapidly assess the feasibility of a desired process without actually performing the rather tedious design calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01003578
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Improved correlation of film condensation data based on a more rigorous application of similarity parameters (1974)
    Springer
    Heat and mass transfer 7 (1974), S. 1-13 
    Details
    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 Es wird gezeigt, wie man bei möglichst konsequenter Anwendung der Ähnlichkeitsmechanik die durch die „Willkür“ gegebene Streuung der Me\ergebnisse auf ein Zehntel — bei besonderen ZustÄnden auch noch viel weniger — derjenigen bei üblicher Darstellung reduzieren kann. Dabei mu\ allerdings neben dem Einflu\ der Reynoldszahl auf den WÄrmeübergang auch gebietsweise der der Prandtlzahl und Weberzahl berücksichtigt werden. Dies ist vorlÄufig in relativ so engen Bereichen der beiden letztgenannten Kennzahlen geschehen, da\ noch keine semiempirische Gebrauchsformeln hergeleitet werden können. Versuche zur Erweiterung der Kennzahlengebiete sind im Gange.
    Notes: Abstract It is shown that a most consistent application of similarity parameters reduces the “random error” of experimental results in film condensation by 90%, in extreme situations even more. On the basis of physical considerations a correlation of data is presented which shows the Nusselt number as a function not only of the Reynolds number but also in certain ranges of the Prandtl and Weber number. Although the latter parameters varied only moderately in the experiments presented here the general idea is supported clearly. Further experiments will have to provide for quantitatively more reliable results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438315
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Zur Bewertung von Kompakt-Wärmeaustauschern (1980)
    Springer
    Heat and mass transfer 13 (1980), S. 205-215 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF01433448
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Thermal behaviour of acidic salts of mixed tetravalent metals (1989)
    Springer
    Journal of thermal analysis and calorimetry 35 (1989), S. 1527-1539 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Ergebnisse über Untersuchungen an in Schichten eingelagerten kristallinen Zirkoniumphosphat sind in der Literatur beschrieben. Das Verhalten kristalliner Phosphate, die sowohl Zirkoniumals auch Titanmetallionen enthalten, wurde bis jetzt nicht untersucht. Als Teil dieser Untersuchungen wurde das thermische Verhalten solcher Materialien im Temperaturbereich 25–1000 °C durch simultanes Registrieren der TG-, DTG- und DTA-Kurven näher bestimmt, dessen Ergebnisse hier dargelegt werden.
    Abstract: Резюме Результаты исследов аний интеркалирован ного кристаллического фо сфата циркония описаны в литературе. До настоящего времен и не исследованы кристал лические фосфаты, содержащие иона цирк ония и титана. Неполно представлено термич еское поведение таки х материалов, изученны х совмещенным методо м ТГ, ДТГ и ДТА в температурном и нтервале 25–1000°. Представлены пол ученные данные.
    Notes: Abstract The results of investigations on intercalated crystalline zirconium phosphate are described in the literature. The behaviour of crystalline phosphates containing both zirconium and titanium metal ions has not been investigated previously. Within these investigations, the thermal behaviour of such materials has been studied in the temperature interval 25–1000 °C by simultaneous recording of TG, DTG and DTA curves. The results are presented in this paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01912930
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Seasonal Denitrification in Flooded and Exposed Sediments from the Amazon Floodplain at Lago Camaleão (1996)
    Springer
    Microbial ecology 32 (1996), S. 47-57 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00170106
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...