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  • 1995-1999  (5)
  • 1980-1984  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Kinetic shape formation during Gd thin film and Si(100) solid phase reaction (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 1672-1674 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The initial stage of the solid phase reaction between gadolinium thin film and Si(100) substrate was investigated by x-ray diffraction and scanning electron microscopy. The interdiffusion was retarded by deliberate contamination of the Gd/Si interface to slow down the extremely rapid reaction. The surface of the reacted film showed pattern formation in separate spots. The fractal-like development of this rare-earth silicide indicates a kinetic-type process—modified by the structure of the Gd film and by the emerging stresses—rather than a previously proposed nucleation-controlled growth. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123650
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Myelin-associated glycoprotein in human retina (1984)
    [s.l.] : Nature Publishing Group
    Nature 307 (1984), S. 548-550 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Rat monoclonal antibodies against myelin-associated glyco-protein were obtained as a by-product of attempts to raise monoclonal antibodies specific for membrane-bound nicotinic acetylcholine receptor (AChR) from the electric organ of Torpedo californica. Rats were immunized with AChR from the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/307548a0
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Correlation of individual symptoms and other clinical variables with cerebrospinal fluid amine metabolites and tryptophan in depression (1981)
    Springer
    European archives of psychiatry and clinical neuroscience 229 (1981), S. 345-353 
    Details
    ISSN: 1433-8491
    Keywords: CSF monoamines ; Depression ; Symptoms ; Tryptophan
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Cerebrospinal fluid 5-hydroxyindoleacetic acid (5HIAA), homovanillic acid (HVA), and tryptophan in both CSF and plasma were measured in a carefully selected group of 33 depressed women. Strict and explicit inclusion and exclusion criteria were used, and CSF was taken under controlled circumstances. Seventeen operationally defined and uniformly rated psychiatric symptoms as well as global depression severity and 12 clinical background variables were correlated with the four biochemical parameters, using multivariate regression analysis based on Spearman's rank correlation coefficient according to the nature of the data. Global depression severity did not correlate with any of the biochemical variables; there were, however, significant correlations between CSF 5HIAA and anxiety, insomnia, and suicide on the one hand, and between CSF HVA and motor symptoms and paranoidity on the other hand. Background variables showed only a few-and much weaker-correlations. It was concluded that central monoamine metabolism does affect some particular psychiatric symptoms but is not parallel with the complex clinical construct of the depressive disease. Further studies using isolated psychopathological symptoms instead of nosological categories are suggested in clinical neurochemistry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01833162
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A survey of possible effects of long-lasting absence of solar activity on climate and some speculations on possible mechanisms (1981)
    Springer
    Climatic change 3 (1981), S. 189-203 
    Details
    ISSN: 1573-1480
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract This paper deals with the prolonged lack (or existence) of solar activity, such as the Maunder or Spörer minima, since considerable climatic changes barely occur within a shorter time interval. For this aim, first the possible influences of the present-day 11-yr solar cycle are considered for higher atmospheric regions, and found scarcely to be responsible for inducing climatic changes. On the other hand, solar activity-generated changes of the solar parameter in the visible spectrum are estimated too. The results of these simple considerations indicate that the external manifestations of the solar cycle hardly can cause observable change in the tropospheric weather (and so the long-lasting solar quiets seem not climatically significant), and seem indirectly to support the possibility, that the Milankovitch mechanism plays an important role in forcing the ice-age oscillations at least during the Quaternary period. Besides it can be concluded, that greater (≥ 0.1%, measured from satellite platform) solar parameter variations cannot be in close connection with the known forms of solar activity, which suggest that the possible, significant secular solar luminosity changes could be generated deep inside the Sun and/or could not be closely related to the sunspot cycle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02423179
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    A survey of possible effects of long-lasting absence of solar activity on climate and some speculations on possible mechanisms (1981)
    Springer
    Climatic change 3 (1981), S. 189-203 
    Details
    ISSN: 1573-1480
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract This paper deals with the prolonged lack (or existence) of solar activity, such as the Maunder or Spörer minima, since considerable climatic changes barely occur within a shorter time interval. For this aim, first the possible influences of the present-day 11-yr solar cycle are considered for higher atmospheric regions, and found scarcely to be responsible for inducing climatic changes. On the other hand, solar activity-generated changes of the solar parameter in the visible spectrum are estimated too. The results of these simple considerations indicate that the external manifestations of the solar cycle hardly can cause observable change in the tropospheric weather (and so the long-lasting solar quiets seem not climatically significant), and seem indirectly to support the possibility, that the Milankovitch mechanism plays an important role in forcing the ice-age oscillations at least during the Quaternary period. Besides it can be concluded, that greater (≥ 0.1%, measured from satellite platform) solar parameter variations cannot be in close connection with the known forms of solar activity, which suggest that the possible, significant secular solar luminosity changes could be generated deep inside the Sun and/or could not be closely related to the sunspot cycle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00154436
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    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Introducing HYPERMET-PC for automatic analysis of complex gamma-ray spectra (1997)
    Springer
    Journal of radioanalytical and nuclear chemistry 215 (1997), S. 271-277 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract In short time activation analysis prompt gamma-activation analysis and in high rate γ-ray spectroscopy in general, the shape parameters for peaks and back ground usually vary, rendering spectrum evaluation codes based on a fixed shape calibration unsuitable. An interactive version of the well-known, fully automatic γ-ray spectrum analysis code HYPERMET has been developed in C ++ for the IBM-PC. It runs under MS-DOS, in conventional memory, and can handle up to 16k-channel spectra, recorded with CANBERRA's System 100 and AccuSpec and with ORTEC's ACE plug-in MCA cards. A Windows-like graphics environment is provided with mouse controlled pull-down menus, pop-up windows and rubber band expansion. All basic features of HYPERMET such as fully automatic peak search, nonlinear fitting of multiplets with automatically adjusted Gaussian peak widths exponential tails and a complex background function have been retained. All details of the fitting procedure are recorded in a data base, hence any fitted region can be retrieved and modified interactively, even after a fully automatic spectrum evaluation. The program also provides an output peak list in SAMPO90 format for further processing. The latter format is widely used in a number of sample analysis programs such as KAYZERO a software package fork 0 standardization in neutron activation analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02034477
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  • 7
    Electronic Resource
    Electronic Resource
    Prompt-gamma activation analysis using thek 0 approach (1998)
    Springer
    Journal of radioanalytical and nuclear chemistry 234 (1998), S. 21-26 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Applying thek 0 standardization method to prompt-gamma activation analysis (PGAA) offers similar benefits as in instrumental neutron activation analysis. It has been demonstrated that under constant flux conditionsk 0-factors obtained by normalizing to a titanium comparator, measured separately, yield consistent analytical sensitivity ratios. The ratio method has been generalized by using stoichiometric compounds for the determination ofk 0-factors. Since chlorine forms compounds with essentially everyelement and it also serves as a detector efficiency standard,k 0 values have been determined relative to chlorine as an internal standard for several analytically important elements in two reactor facilities: the thermal guided beam at the BRR in Budapest and the cold-neutron beams at the NBSR at NIST.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02389741
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    The new prompt gamma-activation analysis facility at Budapest (1997)
    Springer
    Journal of radioanalytical and nuclear chemistry 215 (1997), S. 111-115 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Prompt gamma-activation analysis (PGAA) is an important complementary technique to conventional instrumental activation analysis that can be successfully used in a number of cases when INAA is not applicable. Therefore, a PGAA facility has been constructed at the recently refurbished and upgraded Budapest Research Reactor. It occupies the end position of a new curved themal guide of 30 m length and 2.5×10 cm2 cross section which provides a clean beam of low energy neutrons. The sophisticated HPGe-BGO γ-ray spectrometer system can be operated in Compton-suppression and pair-spectrometer modes simultaneously. The octal splitting of the main BGO improves efficient pair mode operation when coincidences between pairs of opposite segments and the HPGe detector are required separately. Gamma-gamma coincidence measurements will also be possible when the new multiparameter data acquisition system is completed. One of the main tasks at the new facility will be the accumulation of new spectroscopic data for detector calibration and standardisation, as well as for the construction of a more accurate prompt γ-ray library for the chemical elements. Various applications are planned, such as the determination of hydrogen in fullerenes and of toxic trace elements in environmental samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02109886
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Quality assurance features of “HYPERMET-PC” (1998)
    Springer
    Journal of radioanalytical and nuclear chemistry 233 (1998), S. 101-103 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The γ-ray spectrum analysis code HYPERMET-PC has been significantly upgraded since its introduction in the firstk 0-Users Workshop (1992). Some aspects of the implemented procedures in the new version 5.0, such as the novel approach to handle tandem LFC spectra and the benefit of using ortho-normal polynomials for fitting efficiency curves will be outlined. Having realized the importance of quality assurance in applied γ-ray spectrometry, additional utilities have been incorporated for checking system parameters: nonlinearity, energy resolution, etc. The new Nuclide Identification routine makes the program suitable for qualitative analysis both of NAA and PGAA type.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02389654
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    Paper (German National Licenses)
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