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  • 2000-2004  (35)
  • 1965-1969  (7)
  • 1960-1964  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Assessing researcher impacts from a long-term sampling program of wetland communities in the Everglades National Park, Florida, U.S.A. (2004)
    Oxford, UK : Blackwell Science Ltd
    Freshwater biology 49 (2004), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. Long-term monitoring requires repeated visits to a study site, greatly increasing the potential for cumulative visitation effects. For ecological studies in general, and for monitoring in particular, data must be evaluated for confounding artefacts from researcher presence. We compared aquatic communities at long-term sampling plots (nine sites, each with three plots, studied continuously from 6 to 22 years) in the Everglades National Park to previously unsampled reference plots adjacent to them to assess the effects of researcher visitation on the flora and fauna.2. We identified two criteria that are sensitive to local habitat heterogeneity for assessment of visitation impacts. First, the long-term plots must differ from adjacent reference plots by a magnitude that exceeded variation among plots separated by equal or greater distance (i.e. the difference is greater than expected by scaling of community change proportional with distance); and second, multiple reference plots must consistently differ in direction (e.g. greater abundance or less abundance) from adjacent long-term plots. We also tested for increased heterogeneity among samples from long-term plots compared with those not previously visited.3. We found no evidence of researcher effects on fish or macroinvertebrates, and only weak evidence for alteration of emergent plants and periphyton floating mats. Our failure to document visitor impacts may result from either low visitation rate or the dynamic nature of the wetlands studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.2004.01256.x
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  • 2
    Electronic Resource
    Electronic Resource
    Buchbesprechungen (1966)
    Springer
    Naturwissenschaften 53 (1966), S. 284-284 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00621667
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  • 3
    Electronic Resource
    Electronic Resource
    Observation of an α-cluster structure in 36Ar (2000)
    Springer
    Physics of atomic nuclei 63 (2000), S. 1518-1526 
    Details
    ISSN: 1063-7788
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Excitation functions for 32S+α elastic scattering are measured by a new method based on inverse kinematics and a thick gas target. Data corresponding to the 36Ar excitation range 12–16 MeV are treated within the R-matrix approach. Spin-parity assignments are given for over 40 new levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1312885
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  • 4
    Electronic Resource
    Electronic Resource
    Predicting the CPU availability of time‐shared Unix systems on the computational grid (2000)
    Springer
    Cluster computing 3 (2000), S. 293-301 
    Details
    ISSN: 1573-7543
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract In this paper we focus on the problem of making short and medium term forecasts of CPU availability on time‐shared Unix systems. We evaluate the accuracy with which availability can be measured using Unix load average, the Unix utility vmstat, and the Network Weather Service CPU sensor that uses both. We also examine the autocorrelation between successive CPU measurements to determine their degree of self‐similarity. While our observations show a long‐range autocorrelation dependence, we demonstrate how this dependence manifests itself in the short and medium term predictability of the CPU resources in our study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019052825453
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  • 5
    Electronic Resource
    Electronic Resource
    Winter-wheat breeding in Poland (1963)
    Springer
    Euphytica 12 (1963), S. 81-89 
    Details
    ISSN: 1573-5060
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract This article is to fill a gap in the West-European literature by giving some information about Polish winter wheat varieties. The authors give a short description of the soil and climatic conditions in Poland and discuss the problem of adapting newly developed varieties to the very variable conditions in different zones. Then a brief outline of the wheat breeding in Poland since 1860 is given. The most important varieties developed in previous years are discussed. special attention is given to the modern Polish winter wheat varieties, some of which are resistant to frost and to lodging and high yielding. Wheat breeding trends in Poland at present are briefly discussed including the importance of the tillering capacity depending on regional conditions, the thickness and elasticity of straw, disease resistance and winterhardiness. The paper also deals with the plant breeding and research organization in Poland. In conclusion the authors point out the possible importance which some varieties, chiefly the winter-hardy ones, may have to supplement the germ-plasm of wheat in the West-European countries. A table with pedigree of the Polish wheat varieties is added.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033597
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  • 6
    Electronic Resource
    Electronic Resource
    Über die magnetische Untersuchung der Zersetzungsprodukte des Kobalt(II)-hexacyano-ferrates (1965)
    Springer
    Monatshefte für Chemie 96 (1965), S. 795-801 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung Kobalt(II)-hexacyanoferrat wird in der Luft zersetzt und die Zersetzungsprodukte werden analytisch, durch Röntgenaufnahmen und magnetische Messungen identifiziert. Die Rückstände, deren Zusammensetzung von der Zersetzungstemperatur abhängt, bestehen hauptsächlich aus Co, Co3O4, γ-Fe2O3, α-Fe2O3, CoFe2O4 und CoO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00919153
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  • 7
    Electronic Resource
    Electronic Resource
    Über die ferromagnetischen Produkte erwärmter Mischungen von Cu(OH)2/Fe(OH)3 (1967)
    Springer
    Monatshefte für Chemie 98 (1967), S. 135-143 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract The products of boiling mixtures of simultaneously precipitated iron and copper hydroxides were identified by means of X-ray diffraction and magnetic measurements. The ferro-magnetism of the preparation after boiling is caused by iron(III)-γ-oxid.
    Notes: Zusammenfassung Die Kochprodukte der Mischungen von gemeinsam gefällten Eisen- und Kupferhydroxiden wurden durch Röntgenaufnahmen und magnetische Messungen identifiziert. Der Ferromagnetismus des Präparates nach dem Kochen wird durch das Eisen(III)-γ-oxid hervorgerufen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00901108
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  • 8
    Electronic Resource
    Electronic Resource
    Die Löslichkeit eines Bariumferrits in Salpetersäure (1968)
    Springer
    Monatshefte für Chemie 99 (1968), S. 733-739 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Optimum conditions for a stoichiometric dissolution of a magnetically hard ferrite BaO·6 Fe2O3 were determined. The solvent is a 1∶9 aqueous solution of HCl and HNO3.
    Notes: Zusammenfassung Es wurden die optimalen Bedingungen für eine stöchiometrische Auflösung eines magnetisch harten Ferrites BaO· ·6 Fe2O3 ermittelt. Das Lösungsmittel ist ein Gemisch von wäßriger 5n-HCl und 5n-HNO3 im Verhältnis 1∶9
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00901230
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  • 9
    Electronic Resource
    Electronic Resource
    Der Einfluß von Ultraschallwellen auf die katalytischen Eigenschaften des Aluminiumoxydhydrats (1962)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 319 (1962), S. 9-11 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Aluminium oxide hydrate ages under the influence of supersonic waves. This alteration is established by means of catalytic reactions activated by Co++/Al-oxide-hydrate carriers
    Notes: Aluminiumoxydhydrat unterliegt durch Ultraschallwellen gewissen Veränderungen, die als Alterungserscheinungen zu deuten sind. Diese Veränderungen lassen sich nicht direkt, sondern erst unter Zuhilfenahme von Co++-Promotorionen auf katalytischer Grundlage feststellen.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19623190103
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  • 10
    Electronic Resource
    Electronic Resource
    Schweres Eisenhydroxid, α-FeOOD (1967)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 351 (1967), S. 63-67 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Deutero iron(III) oxide hydroxide of goethite type, α-FeOOD, has been prepared by Fe(OD)3 → α-FeOOD conversion which was investigated by x-ray powder, TG, DTA and electron microscope techniques. The endothermic dehydration DTA peak of α-FeOOD occurs at a 10°C higher temperature than that of α-FeOOH (analogously prepared), the exothermic peak corresponding to the crystallization to Fe2O3 lies 5°C higher for α-FeOOD.
    Notes: Es wird eine Methode zur Darstellung von schwerem Eisenhydroxid vom Goethittyp, α-FeOOD, beschrieben. Die Umwandlung Fe(OD)3 → α-FeOOD wurde röntgenographisch, elektronenmikroskopisch, thermogravimetrisch und differentialthermoanalytisch untersucht. Im Vergleich zu unter analogen Bedingungen erzeugtem α-FeOOH liegt bei FeOOD der mit der Wasserabgabe verbundene endotherme Peak um 10°C höher, der durch die Kristallisation zu Fe2O3 verursachte exotherme Peak ist analog um 5°C verschoben.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19673510109
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