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  • 1
    Electronic Resource
    Electronic Resource
    Positron annihilation in synthetic zeolites (II) magnetic quenching effect (1990)
    Springer
    Applied physics 50 (1990), S. 39-42 
    Details
    ISSN: 1432-0630
    Keywords: 78.70.D ; 81.90.+c
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Positron lifetime spectra were re-measured for a series of synthetic zeolites using a large time window of observation. Magnetic quenching experiments were also performed for the zeolites, and it has been confirmed that both the λ4 and the λ3 components are due to o-Ps. The annihilation rate of the third component, λ3, showed a good correlation with the size of the largest voids, which is similar to the correlation reported for other compounds. However the annihilation rate of the longest-lived component, λ4, showed a poor correlation with the void size. The λ3 component has thus been assigned to o-Ps in the regular voids of the zeolites, and the λ4 component to that escaped to inter-particle open spaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323952
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  • 2
    Electronic Resource
    Electronic Resource
    On a large difference in enthalpic virial coefficient among some isomers of alkoxyalcohol (1992)
    Springer
    Journal of thermal analysis and calorimetry 38 (1992), S. 1883-1890 
    Details
    ISSN: 1572-8943
    Keywords: flow microcalorimeter ; hydrophobic interaction ; molar excess enthalpies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mittels eines Fluß-Mikrokalorimeters wurden bei 298.15 K im gesamten Konzentrationsintervall die molaren Überschußenthalpien für wäßrige Lösungen aus 3-Methoxy-1-Butanol (3-MB) und 1-Methoxy-2-Butanol (M-2B) gemessen. Anhand der experimentellen Daten erstellten wir den Enthalpiepaar-Wechselwirkungsparameter hxx und erhielten folgende Reihenfolge: hxx(3-MB) ≫ hxx(M-2B) Diese große Abweichung bei hxx legte uns einige neue Faktoren nahe, die einen Einfluß auf die hydrophobe Wechselwirkung haben können: “Grundgerüst”, “Hydroxylgruppen” als auch “Sauerstoffatome”.
    Notes: Abstract Molar excess enthalpies for aqueous solutions of 3-methoxy-1-butanol (3-MB) and 1-methoxy-2-butanol (M-2B) have been measured at 298.15 K over the whole concentration range with a flow microcalorimeter. From the experimental data, we evaluated the enthalpic interaction parameter hxx and obtained the following order:h xx (3 MB)≫ hxx(M-2B) This large difference in hxx. provided us some new factors which might have the influence on hydrophobic interaction: ‘fundamental frame’, ‘hydroxyl group’, and ‘ether oxygen atom’.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01974682
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  • 3
    Electronic Resource
    Electronic Resource
    A unified model of dwarf nova outbursts based on the disk instability (1993)
    Springer
    Astrophysics and space science 210 (1993), S. 359-360 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A unified model for outbursts of dwarf novae is proposed based on the disk instability model in cataclysmic variable stars. In this model, two different intrinsic instabilities (i.e., the thermal instability and the tidal instability) within accretion disks are considered in non-magnetic cataclysmic variable stars. It is suggested that all of three sub-classes of dwarf novae (i.e., U Gem-type, Z Cam-type and SU UMa-type dwarf novae) may be explained in terms of two model parameters of the orbital period of the binary and of the mass transfer rate within the framework of the disk instability model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657926
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  • 4
    Electronic Resource
    Electronic Resource
    Viskoelastische Eigenschaften von kammartigen Polystyrolen mit verschiedenen Molekulargewichten der Grundpolymeren (1974)
    Springer
    Colloid & polymer science 252 (1974), S. 188-188 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01555703
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  • 5
    Electronic Resource
    Electronic Resource
    Determination of polonium-210 in phosphoric acid (1999)
    Springer
    Journal of radioanalytical and nuclear chemistry 240 (1999), S. 887-891 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Polonium-210 in phosphoric acid has been recognized as a significant source of alpha contamination of processed Si-wafers for memory devices of computer. In the present work, a convenient method was developed for the determination of trace210Po in phosphoric acid of high purity. For the determination,209Po was used as a yield tracer. The present method consists of (1) addition of the tracer to 5 ml aliquot of phosphoric acid sample, (2) pH adjustment (to 2) of the sample solution to make up electrolytic solution, (3) electrodeposition for the simultaneous achievement of Po separation and preparation of counting source on stainless-steel disc, and (4) alpha-ray spectrometry. By the developed method, more than 95% of Po was separated from phosphoric acid sample onto counting disc. The minimum detectable radioactivity of210Po in 5 ml of phosphoric acid was about 0.03 mBq by counting the electrodeposited alpha-activity for 10 days under a counting efficiency of ≈30%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02349867
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  • 6
    Electronic Resource
    Electronic Resource
    Determination of polonium-210 in phosphoric acid (1999)
    Springer
    Journal of radioanalytical and nuclear chemistry 242 (1999), S. 251-251 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02345930
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  • 7
    Electronic Resource
    Electronic Resource
    Evaluation of solute hydrophobicity by reversed-phase high performance liquid chromatography using aqueous binary mobile phases (1990)
    Springer
    Chromatographia 29 (1990), S. 275-288 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Hydrophobic parameter ; Capacity factor variation ; Organic modifier concentration ; Displacement model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The dependence of the capacity factor (k′) on the concentration of the organic modifier (D) in the aqueous binary mobile phase in reversed-phase high-performance liquid chromatography has been investigated to evaluate the hydrophobicity of the solute molecule. The r-values, defined as the slope of log k′ vs. log(1/D) plots, were measured for various solutes and related to the non-polar surface area and the partition coefficients. The r-value was found to be a good indication of solute hydrophobicity. Detailed investigation of the results allowed to consider statistically the molecular posture of the solute adsorbed onto the stationary alkyl ligand.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02317918
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  • 8
    Electronic Resource
    Electronic Resource
    Retention characteristics of octadecylsilyl silica, trimethylsilyl silica and phenyldimethylsilyl silica in reversed-phase liquid chromatography (1990)
    Springer
    Chromatographia 30 (1990), S. 99-104 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Reversed stationary phases ; Hydrophobic parameter ; Water/methanol eluent mixtures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The hydrophobic retention characteristics of stationary ligands for reversed-phase high-performance liquid chromatography have been evaluated from the slope (r-value) of the plots relating the capacity factors (log k′) of selected aliphatic and aromatic compounds with the reciprocal of methanol concentration (log (1/[MeOH])) in aqueous mobile phase. Octadecylsilyl (ODS), trimethylsilyl (TMS) and phenyldimethylsilyl (phenyl) groups were selected as the stationary ligands bonded to silica support. On ODS or TMS silicas, unlike on phenyl silica, aliphatic compounds gave slightly larger r-values than aromatic compounds, indicating that the shape of the ligand recognizes the hydrophobic surfaces of aliphatic and aromatic solute molecules. On TMS and phenyl silicas, the degree of solute hydrophobicity contributing to its retention is about 90% and 85% of that on ODS silica, respectively. On the other hand, on TMS and phenyl silicas, the polar functional group on the solute molecule brought about a smaller decrease in retention than on ODS silica.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02270457
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  • 9
    Electronic Resource
    Electronic Resource
    Chromatography of inorganic ions on sulfoethyl cellulose layer in mixed sulfuric acid-organic solvent media (1984)
    Springer
    Chromatographia 18 (1984), S. 692-694 
    Details
    ISSN: 1612-1112
    Keywords: Thin-layer chromatography ; Sulfoethyl (SE) cellulose ; Inorganic ions ; Sulfuric acid — organic solvent media
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The thin-layer chromatographic behavior of 49 inorganic ions has been systematically studied on layers of sulfoethyl (SE) cellulose, a strongly acidic cation-exchanger, with binary solvent mixtures consisting of sulfuric acid and an organic solvent such as methanol or acetone. The characteristic retention on the cellulose layer can be recognized for some ions forming sulfato complexes in the acid-organic solvent medium, and some aspects of the behavior are discussed. Chromatographic separations of analytical interest are also demonstrated on the SE-cellulose layer with acid-methanol and acid-acetone solutions used as mobile phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02265816
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of the polar functional group of the solute on hydrophobic interaction with the stationary ligand in reversed-phase high-performance liquid chromatography (1990)
    Springer
    Chromatographia 29 (1990), S. 551-556 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Linear solvation energy relationship (LSER) ; Hydrophobic adsorption ; Octanol/water partition coefficient ; Solute-solvent interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The effects of the polar functional group of a solute on the r-value (the slope of the log-log plots of capacity factor vs. reciprocal of the organic solvent concentration in an aqueous binary mobile phase) and on the 1-octanol/water partition coefficient are compared, based on the linear solution energy relationship concept. Though both effects are closely related to the solute-solvent interaction, the effect on the partition coefficient depends on the difference in the abilities of the organic solvent and water to interact with the solute, while the effect on the r-value depends on the ability of the solute to interact with the solvent (especially water). The mobile phase composition, as far as it is in the intermediate range, causes little change in the effect of the polar functional group on the hydrophobic retention of the solute. Consequently, the r-value was confirmed to represent the hydrophobic interaction between the solute and ligand.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02261221
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