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  • Chemistry  (48)
  • 68.65  (1)
  • Amphipoda  (1)
  • Biochemistry and Biotechnology
  • Phosphorus
  • biogeography
  • Wiley-Blackwell  (48)
  • Springer  (3)
  • 1990-1994  (10)
  • 1935-1939  (41)
Collection
Keywords
Publisher
  • Wiley-Blackwell  (48)
  • Springer  (3)
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Thermal stability of Mo/Si multilayer soft-X-ray mirrors fabricated by electron-beam evaporation (1994)
    Springer
    Applied physics 58 (1994), S. 371-376 
    Details
    ISSN: 1432-0630
    Keywords: 68.55 ; 68.65 ; 78.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Mo/Si multilayers are fabricated by electron-beam evaporation in UHV at different temperatures (30° C, 150° C, 200° C) during deposition. After completion their thermal stability is tested by baking them at temperatures (T bak) between 200° C and 800° C in steps of 50° C or 100° C. After each baking step the multilayers are characterized by small angle CuKα-X-ray diffraction. Additionally, the normal incidence soft-X-ray reflectivity for wavelengths between 11 nm and 19 nm is determined after baking at 500° C. Furthermore, the layer structure of the multilayers is investigated by means of Rutherford Backscattering Spectroscopy (RBS) and sputter/Auger Electron Spectroscopy (AES) technique. While the reflectivity turns out to be highest for a deposition temperature of 150° C, the thermal stability of the multilayer increases with deposition temperature. The multilayer deposited at 200° C stands even a 20 min 500° C baking without considerable changes in the reflectivity behaviour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323612
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  • 2
    Electronic Resource
    Electronic Resource
    Density dependent interactions between VA mycorrhizal fungi and even-aged seedlings of two perennial Fabaceae species (1992)
    Springer
    Oecologia 91 (1992), S. 281-287 
    Details
    ISSN: 1432-1939
    Keywords: Vesicular-arbuscular mycorrhizas ; Densitydependence ; Plant population dynamics ; Resource depletion ; Phosphorus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The interaction of density and mycorrhizal effects on the growth, mineral nutrition and size distribution of seedlings of two perennial members of the Fabaceae was investigated in pot culture. Seedlings of Otholobium hirtum and Aspalathus linearis were grown at densities of 1, 4, 8 and 16 plants per 13-cm pot with or without vesicular-arbuscular (VA) mycorrhizal inoculum for 120 days. Plant mass, relative growth rates, height and leaf number all decreased with increasing plant density. This was ascribed to the decreasing availability of phosphorus per plant as density increased. O. hirtum was highly dependent on mycorrhizas for P uptake but both mycorrhizal and non-mycorrhizal A. linearis seedlings were able to extract soil P with equal ease. Plant size distribution as measured by the coefficient of variation (CV) of shoot mass was greater at higher densities. CVs of mycorrhizal O. hirtum plants were higher than those of non-mycorrhizal plants. CVs of the facultatively mycorrhizal A. linearis were similar for both mycorrhizal and non-mycorrhizal plants. Higher CVs are attributed to resource preemption by larger individuals. Individuals in populations with high CVs will probably survive stress which would result in the extinction of populations with low CVs. Mass of mycorrhizal plants of both species decreased more rapidly with increasing density than did non-mycorrhizal plant mass. It is concluded that the cost of being mycorrhizal increases as plant density increases, while the benefit decreases. The results suggest that mycorrhizas will influence density-dependent population processes of faculative and obligate mycorrhizal species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317797
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  • 3
    Electronic Resource
    Electronic Resource
    First record of Crustacea Malacostraca from fresh waters in the Canary Islands (1990)
    Springer
    Hydrobiologia 206 (1990), S. 53-59 
    Details
    ISSN: 1573-5117
    Keywords: Tenerife ; epigean fresh water ; Amphipoda ; Rhipidogammarus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Resumen Crustacea Malacostraca era hasta ahora desconocida de las aguas dulces de las Islas Canarias. Una nueva especie de anfípodo, Rhipidogammarus rheophilus, ha sido recientemente descubierto de fuentes y manantiales de Tenerife.
    Notes: Abstract Crustacea Malacostraca were hitherto unknown from fresh waters of the Canary Islands. A new species of Amphipoda, Rhipidogammarus rheophilus, has recently been discovered in springs and spring brooks in Tenerife.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00018969
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  • 4
    Electronic Resource
    Electronic Resource
    Borwasserstoffe. XXI. Mitteilung: Zur Kenntnis der Kaliumverbindungen des B4H10 und des B5H9 (1935)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 225 (1935), S. 243-253 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ähnlich wie K2(B2H2) wurde K2(B2H10) durch Schütteln von B4H10 rnit Kaliumamalgam hergestellt. Die Isolierung des Salzes und die Untersuchung seiner thermischen Zersetzung sind durch Nebenreaktionen erschwert. Doch ließ sich feststellen, daß eine erste Stufe der Zersetzung, bei 170°, in der Reaktion K2(B4H10)→K2(B4H8)+H2 besteht und daß bei höherem Erhitzen, bis 450°, nur noch weiterer Wasserstoff abgegeben wird, während das Verhältnis 2K : 4B erhalten bleibt. Die Beobachtungen stützen die Annahme, daß der von K-Abspaltung begleitete thermische Zerfall des K2(B2H6) über K2(B4H10) führt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19352250307
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  • 5
    Electronic Resource
    Electronic Resource
    Entwicklung verschleißfester TiN-Schichten für Zerspanwerkzeuge (1993)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 24 (1993), S. 125-130 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: HSS-Zerspanwerkzeuge wurden mittels Magnetron-Sputtern mit TiN beschichtet unter Variation der Sputterparameter Druck, Leistung und Bias-Spannung. Untersucht wurde der Zusammenhang zwischen den grundlegenden Schichteigenschaften Eigenspannung, Härte und Morphologie und dem Verhalten gegen tribologische Beanspruchung mittels Modellverschleißversuchen und Zerspanversuchen von Mumetall. Sowohl die Schichtmorphologie als auch die Eigenspannungen wurden durch die Parameter-variation verändert, um optimale Beschichtungsbedingungen ableiten zu können. Die tribologischen Untersuchungen zeigen, daß die Beschichtungsparameter und die Schichtdicke den Verschleißwiderstand maßgeblich beeinflussen können. Dabei führen die Modellverschleiß- und Zerspanergebnisse zu qualitativ gleichen Aussagen, so daß eine aussagekräftige Simulation des Werkzeugverschleißes als Test für weitere modifizierte Schichten verwendet werden kann.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19930240311
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  • 6
    Electronic Resource
    Electronic Resource
    Deutsche Chemische Gesellschaft. Besondere Sitzung am 8. Februar 1936 im Hofmannhaus, Berlin (1936)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 49 (1936), S. 168-169 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19360490909
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  • 7
    Electronic Resource
    Electronic Resource
    Endlich quecksilberfreie Haarfilzhüte! (1938)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 51 (1938), S. 33-35 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19380510203
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  • 8
    Electronic Resource
    Electronic Resource
    Anorganische Chemie. Von Prof. Dr. Wilhelm Klemm. Verlag Walter de Gruyter & Co., Berlin-Leipzig 1935 (Sammlung Göschen 37), 173 S., 18 Fig., 11 × 16 cm. Preis geb. RM. 1,62 (1935)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 48 (1935), S. 179-179 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19350481106
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis of thermoreversible polymers by aminolysis of poly(methyl 2-(N-acryloylamino)-2-methoxyacetate): Correlations of the lower critical solution temperatures (LCST) with the side group structures and the salt concentration in aqueous systems (1994)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 15 (1994), S. 271-277 
    Details
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1994.030150314
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  • 10
    Electronic Resource
    Electronic Resource
    Borwasserstoffe. XXIV. Mitteilung. Zur Kenntnis der Boransalze (1936)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 228 (1936), S. 178-192 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Untersuchung umfaßte die Salze K2(B2H6), Na2(B2H6), Ca(B2H6), K2(B4H10), Na2(B4H10), K2(B5H9), die aus überschüssigem Boran und Amalgam dargestellt und durch Erwärmen auf etwa 170° vom Hg befreit, wurden. Hierbei blieben die Diboransalze unverändert, die anderen verloren H2 und gingen in K2(B4H8), Na2(B4H8), K4(B10H16) über. Höher erhitzt (450°), lieferten die Diboran- und Tetraboran-Alkalisalze dieselben Rückstände von der Bruttoformel Me2B4H6 bis Me2B4H4; diese erinnerten in ihren Reaktionen an das feste Borhydrid (BH)x. K2(B5H9) gab K2(B5H3) oder K4(B10H6). Mit HCl reagierten alle Alkalisalze in der gleichen Art: Zum Teil wurden die betreffenden Borane frei, indem Alkalichlorid entstand; zum anderen Teil wurde im Boransalz H durch Cl ersetzt, beim Tetraborankalium bis zur Formel K2(B4H5CJl5). Die Debye-Scherrer-Diagramme sämtlicher K-Salze glichen sich in auffallender Weise; desgleichen diejenigen der Na-Salze. Mit (verhältnismäßig schwach) aktiviertem Wasserstoff ließ sich eine nachweisbare Hydrierung von K2(B2H6) zu der von der Theorie vorausgesehenen Salz K(BH4) nicht erzielen.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19362280209
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