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  • Artikel  (38)
  • Springer  (38)
  • 1980-1984  (17)
  • 1975-1979  (17)
  • 1970-1974  (4)
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  • Artikel  (38)
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  • 1
    Digitale Medien
    Digitale Medien
    T-maze phototaxis ofDrosophila melanogaster and several mutants in the visual systems (1977)
    Springer
    Journal of comparative physiology 116 (1977), S. 209-225 
    Details
    ISSN: 1432-1351
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary T-maze phototaxis ofDrosophila melanogaster and several of its mutants was investigated as function of the light illuminating the mazes. For visible light the response curves of thewildtype are quite complex and nonmonotonic functions of the light intensity. The data are interpreted as a result of an interaction between visual subsystems: the system which receives inputs from receptor cells R1-R6 is inhibited by the system of receptor cells R7 and R8, probably by R8 alone.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00605403
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  • 2
    Digitale Medien
    Digitale Medien
    Sulphur potential measurements with a two-phase sulphideoxide electrolyte (1983)
    Springer
    Journal of applied electrochemistry 13 (1983), S. 55-67 
    Details
    ISSN: 1572-8838
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract The open circuit potentials of the galvanic cell,Pt (or Au)¦(Ar + H2S + H2)′∥CaS + ZrO2(CaO)∥ (Ar + H2S+ H2)″£t (or Au) has been measured in the temperature range 1000 to 1660 K and PH2S:PH 2 ratios from 1.73×10−5 to 2.65×10−1. The solid electrolyte consists of a dispersion of calcium sulphide in a matrix of calcia-stabilized zirconia. The surface of the electrolyte is coated with a thin layer of calcium sulphide to prevent the formation of water vapour by reaction of hydrogen sulphide with calcium oxide or zirconia present in the electrolyte. The use of a ‘point electrode’ with a catalytically active tip was necessary to obtain steady emfs. At low temperatures and high sulphur potentials the emfs agreed with the Nernst equation. Deviations were observed at high temperatures and low sulphur potentials, probably due to the onset of significant electronic conduction in the oxide matrix of the electrolyte. The values of oxygen and sulphur potentials at which the electronic conductivity is equal to ionic conductivity in the two-phase electrolyte have been evaluated from the emf response of the cell. The sulphide-oxide electrolyte is unsuitable for sulphur potential measurements in atmospheres with high oxygen potentials, where oxidation of calcium sulphide may be expected.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00615887
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  • 3
    Digitale Medien
    Digitale Medien
    Decomposition of β-alumina in an oxygen potential gradient (1983)
    Springer
    Journal of applied electrochemistry 13 (1983), S. 469-472 
    Details
    ISSN: 1572-8838
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract Single phase sodiumβ-alumina solid electrolyte was found to undergo isothermal phase separation in electrochemical cells, where a large oxygen potential gradient was imposed across the electrolyte and electrodes, not reversible to sodium ions, were short circuited. The experimental conditions and evidence of decomposition are outlined and a thermodynamic explanation for the phenomenon is given. This finding may lead to new methods for making multi-layered ceramic materials involving ionic conductors.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00617521
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  • 4
    Digitale Medien
    Digitale Medien
    Phase relations in the Fe-Ni-Cr-S system and the sulfidation of an austenitic stainless steel (1979)
    Springer
    Oxidation of metals 13 (1979), S. 25-55 
    Details
    ISSN: 1573-4889
    Schlagwort(e): thermochemical diagrams ; Fe-Cr-S system ; Fe-Ni-S system ; Ni-Cr-S system ; Fe-Ni-Cr-S system
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The stability fields of various sulfide phases that form on Fe-Cr, Fe-Ni, Ni-Cr, and Fe-Cr-Ni alloys have been developed as a function of temperature and the partial pressure of sulfur. The calculated stability fields in the ternary A-B-S system are displayed on plots of log $${\text{p}}_{S_2 } $$ vs. the conjugate extensive variable (nA/nA−nB), which provides a better framework for following the sulfidation of Fe-Cr-Ni alloys at high temperatures. Experimental and estimated thermodynamic data were used in developing the sulfur potential diagrams. Current models and correlations were employed to estimate the unknown thermodynamic behavior of solid solutions of sulfides and to supplement the incomplete phase-diagram data of geophysical literature. These constructed stability field diagrams are in excellent agreement with the sulfide phases and compositions determined experimentally during the sulfidation of SAE 310 stainless steel. The sulfur potential plots appear to be very useful in predicting and correlating the sulfidation of commercial alloys.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00715869
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  • 5
    Digitale Medien
    Digitale Medien
    Phase relationships in the system Cr-W-O and thermodynamic properties of CrWO4 and Cr2WO6 (1980)
    Springer
    Journal of materials science 15 (1980), S. 2167-2174 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The phase diagram of the Cr-W-O system at 1000° C was established by metallographic and X-ray identification of the phases present after equilibration in evacuated silica capsules. Two ternary oxide phases, CrWO4 and Cr2WO6 were detected. The oxygen potential over the three-phase mixtures, W+Cr2O3 s+CrWO4, WO2.90+CrWO4+Cr2WO6 and Cr2O3+CrWO4+Cr2WO6, were measured by solid state cells incorporating Y2O3 stabilized ZrO2 electrolyte and Ni+NiO reference electrode. The Gibbs' energies of formation of the two ternary phases can be represented by the following equations $$\begin{gathered} W(s) + \tfrac{1}{2} Cr_2 O_3 (s) + \tfrac{5}{4} O_2 (g) \to CrWO_4 (s) \hfill \\ \Delta G^0 = - 172 047 + 48.725T ( \pm 230) cal mol^{ - 1} \hfill \\ Cr_2 O_3 (s) + WO_3 (s) \to Cr_2 WO_6 (s) \hfill \\ \Delta G^0 = - 3 835 + 0.235{\rm T} ( \pm 500) cal mol^{ - 1} \hfill \\ \end{gathered}$$
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00552303
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  • 6
    Digitale Medien
    Digitale Medien
    The electronic structure of the alloying element and the stability of the gamma phase in iron alloys (1975)
    Springer
    Journal of materials science 10 (1975), S. 1090-1092 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00823229
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  • 7
    Digitale Medien
    Digitale Medien
    Ion-exchange equilibria between (Mn, Co)O solid solution and (Mn, Co) Cr2O4 and (Mn, Co) Al2O4 spinel solid solutions at 1100° C (1977)
    Springer
    Journal of materials science 12 (1977), S. 481-488 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The compositions of the (Mn,Co)O solid solution with rock salt structure in equilibrium with (Mn,Co)Cr2O4 and (Mn,Co)Al2O4 spinel solid solutions have been determined by X-ray diffraction measurements at 1100° C and an oxygen partial pressure of 10−10 atm. The ion exchange equilibria are quantitatively analysed, using values for activities in the (Mn,Co)O solid solution available in the literature, in order to obtain activities in the spinel solid solutions. The MnAl2O4-CoAl2O4 solid solution exhibits negative deviations from Raoult's law, consistent with the estimated cation disorder in the solid solution, while the MnCr2O4-CoCr2O4 solid solution shows slightly positive deviations. The difference in the Gibbs free energy of formation of the two pure chromites and aluminates derived from the results of this study are in good agreement with recent results obtained from solid oxide galvanic cells and gas-equilibrium techniques.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00540270
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  • 8
    Digitale Medien
    Digitale Medien
    Ion-pair-reversed-phase high-performance liquid chromatographic determination of porphyrins from red blood cells (1982)
    Springer
    Chromatographia 16 (1982), S. 190-191 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Ion-pair reversed-phase HPLC ; Protoporphyrin ; Zinc protoporphyrin ; Red blood cells ; Porphyria
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary An extraction and ion-pair reversed-phase HPLC procedure is described for the separation and determination of protoporphyrin and its zinc chelate from red blood cells. The recoveries were greater than 90% with coefficients of variation between 8 and 10%. A linear response curve was obtained from 800 to 4000 μg/l erythrocytes for the porphyrins.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02258897
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  • 9
    Digitale Medien
    Digitale Medien
    Quantitation of aniline in water, urine and serum by isotopic dilution mass fragmentography (1982)
    Springer
    Chromatographia 16 (1982), S. 188-189 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Aniline ; Dimethylthiophosphinyl derivatives ; Mass fragmentography ; Environmental analysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary A method for trace analysis of aniline in water, urine and serum samples is presented. Internal standardisation with d5-aniline, extraction, derivatisation with dimethylthiophosphinic chloride, gas chromatographic separation on a glass capillary column and mass fragmentographic quantitation are essential steps of the analytical procedure. A detection limit of 20 pg/ml in water and 500 pg/ml in urine or serum is achieved.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02258896
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  • 10
    Digitale Medien
    Digitale Medien
    Neue gas-chromatographische Methode zur quantitativen Bestimmung von 3α-Ätiocholanolon aus dem Plasma mit dem Alkaliflammendetektor (1976)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 279 (1976), S. 158-159 
    Details
    ISSN: 1618-2650
    Schlagwort(e): Best. von 3α-Ätiocholanolon in Plasma ; Chromatographie, Gas ; Alkaliflammendetektor
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00440825
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