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  • 1
    Electronic Resource
    Electronic Resource
    Intercalation reaction kinetics: a TDPAC study of 2H-TaS2 intercalation (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 1971-1976 
    Details
    ISSN: 0392-6737
    Keywords: Chemical kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si riportano le osservazioniin situ dell'interazione quadrupolare nucleare di181Ta durante l'elettrointercalazione di 2H-TaS2 con ioni di gadolinio idratati per mezzo di correlazioni angolari differenziali perturbate nel tempo (TDPAC).
    Abstract: Резюме Мы сообщаем о наблюдении181Ta ядерного квадрупольного взаимодействия во время электровключения 2H-TaS2 с гидратированными ионами гадолиния с помощью временных дифференциальных возмущенных угловых корреляций.
    Notes: Summary We report on thein situ observation of the181Ta nuclear quadrupole interaction during electrointercalation of 2H-TaS2 with hydrated gadolinium ions by means of time differential perturbed angular correlations (TDPAC).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457896
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  • 2
    Electronic Resource
    Electronic Resource
    Electrointercalation into 2H-TaS2 single crystals:in situ dilatometry and superconducting properties (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 1706-1711 
    Details
    ISSN: 0392-6737
    Keywords: Superconducting materials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si è studiata l'elettrointercalazione dei seguenti ioni metallici idrati in cristalli 2H-TaS2: Na+, K+, Ca2+, Zn2+, Mn2+, La3+, Gd3+, Pr3+. Si trattano studi dilatometriciin situ della reazione e le proprietà superconduttrici di questi composti.
    Abstract: Резюме Иссиедуется злектропрослойка следуюших металлических ионов (Na+, K+, Ca2+, Zn2+, Mn2+, Co3+, Gd3+, Pr3) в монокристаллах 2H-TaS2. Приводятся резулътаты дилатометрических исследований и сверхироводящие свойства зтих соединений.
    Notes: Summary The electrointercalation of the following hydrated metal ions into 2H-TaS2 crystals was investigated: Na+, K+, Ca2+, Zn2+, Mn2+, Co2+, La3+, Gd3+, Pr3+. We report onin situ dilatometric studies of the reaction and on superconducting properties of these compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457854
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  • 3
    Electronic Resource
    Electronic Resource
    Nuclear orientation study of182Ta in 2H-TaS2 (1983)
    Springer
    Hyperfine interactions 16 (1983), S. 863-866 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Quadrupole-interaction nuclear orientation experiments have been performed on182Ta (jπ=3−1; T1/2=115d) in 2H-TaS2. γ-anisotropies up to ∼ 30 % have been observed at a temperature of ∼ 8 mK, which, however, is only about half of the value expected taking into account known results of TDPAC measurements on181Ta in 2H-TaS2. In principle, matrices of dichalcogenides could be well suited for nuclear quadrupole resonance on oriented nuclei (NQR-ON) experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02147383
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  • 4
    Electronic Resource
    Electronic Resource
    Variogram models for regional groundwater geochemical data (1982)
    Springer
    Mathematical geology 14 (1982), S. 629-644 
    Details
    ISSN: 1573-8868
    Keywords: variogram ; kriging ; interpolation ; contouring ; inverse distance weighting ; geochemical gradient
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract Four variogram models for regional groundwater geochemical data are presented. These models were developed from an empirical study of the sample variograms for more than 10 elements in groundwaters from two geologic regions in the Plainview quandrangle, Texas. A procedure is given for the estimation of the variogram in the isotropic and anisotropic case. The variograms were found useful for quantifying the differences in spatial variability for elements within a geologic unit and for elements in different geologic units. Additionally, the variogram analysis enables assessment of the assumption of statistical independence of regional samples which is commonly used in many statistical procedures. The estimated variograms are used in computation of kriged estimates for the Plainview quadrangle data. The results indicate that an inverse distance weighting model was superior for prediction than simple kriging with the particular variograms used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01033884
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  • 5
    Electronic Resource
    Electronic Resource
    Solid-state reaction kinetics studied by PAC (1981)
    Springer
    Hyperfine interactions 10 (1981), S. 1043-1049 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01022052
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  • 6
    Electronic Resource
    Electronic Resource
    Inorganic biochemistry with short-lived radioisotopes as nuclear probes (2000)
    Springer
    Hyperfine interactions 129 (2000), S. 511-527 
    Details
    ISSN: 1572-9540
    Keywords: γ-spectroscopy ; nuclear quadrupole interaction (NQI) ; time differential perturbed angular correlation (TDPAC) ; metalloproteins ; metalloenzymes ; enzymatic detoxification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Metal ions are ubiquitous in the biosphere. In living organisms metalloproteins with specifically designed metal cores perform vital chemical processes. On the other hand, several heavy metals are detrimental to living organisms and nature has developed effective enzymatic detoxification systems which convert toxic metal ions to less toxic species. The nuclear spectroscopy technique Time Differential Perturbed Angular Correlation (TDPAC) of γ-rays uses radioactive isotopes as nuclear probes in these metal cores to obtain a better understanding of the structural and functional significance of these metal cores by monitoring the nuclear quadrupole interaction of the TDPAC probe. Since this technique is based on the nuclear decay, it is also applicable under physiological conditions, i.e., especially at picomolar concentrations. For these studies an indispensable prerequisite is the production of the TDPAC probes with highest possible specific activity and purity as is done by the on-line mass separator ISOLDE at CERN in Geneva.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012646808055
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  • 7
    Electronic Resource
    Electronic Resource
    Hyperfine interaction investigations of the internal dynamics of biomolecules (1983)
    Springer
    Hyperfine interactions 16 (1983), S. 869-879 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Three different types of low frequency internal motions in biomolecules are illustrated by representative modern applications of hyperfine spectroscopic techniques: (1) the rotation of aromatic amino acid residues is studied by1H nuclear magnetic resonance via chemical shift averaging; (2) confined diffusion is studied by57Fe Mössbauer-spectroscopy via the variation of the recoilfree fraction and via the appearance of very broad resonance absorption lines; (3) large-scale intramolecular reorientational motion is studied by perturbed angular correlation of γ-rays emitted from radioactive 199mHg labels via the loss of anisotropy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02147384
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  • 8
    Electronic Resource
    Electronic Resource
    Nuclear quadrupole interaction at99Tc in molybdenum compounds (1983)
    Springer
    Hyperfine interactions 16 (1983), S. 915-920 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The nuclear quadrupole interaction (NQI) at99Tc on molybdenum sites in a series of molybdenum compounds was investigated by time differential perturbed angular correlation. The NQI is rather small for compounds with isolated oxygen/sulfur tetrahedra and fairly large for all compounds with condensed coordination polyhedra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02147393
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  • 9
    Electronic Resource
    Electronic Resource
    Perturbed angular correlation and Mössbauer study of the hydrogen distribution near Ru, Rh and Pd in palladium hydride (1983)
    Springer
    Hyperfine interactions 16 (1983), S. 795-800 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mössbauer experiments with the 90 keV resonance of99Ru as well as PAC measurements using the 353 and 528 keV - 90 keV cascades in99Ru and the 84 keV - 75 keV cascade in100Rh were combined in a study of the hyperfine interactions produced by the hydrogen distribution near Ru, Rh and Pd atoms in Β-PdHx (0.6≲x≲1.0). The electric field gradients produced by the non-cubic nearest neighbour hydrogen distribution were found to be very small. This shows that the protons are very strongly shielded and justifies an interpretation of the Mössbauer spectra in terms of isomer shift distributions only. By combining the two methods one thus can obtain a rather detailed picture of the hydrogen distribution near the probe atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02147369
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  • 10
    Electronic Resource
    Electronic Resource
    Evidence for Ruelle's turbulent crystal? (1984)
    Springer
    Hyperfine interactions 20 (1984), S. 263-283 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The nuclear quadrupole interaction at181Ta on Hf/Zr-sites in ZrS2, HfS2, HfSe2, and HfTe5 exhibits anomalies as a function of temperature, indicative of lattice instabilities. We interpret our observations as being due to static or low frequency structural distortions perpendicular to the layers and take these as evidence for Ruelle's turbulent crystal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02069376
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