Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 2000-2004  (8)
  • 1980-1984  (20)
  • 1960-1964  (6)
Source
Material
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    VLF GROUND SURVEYS, A POWERFUL TOOL FOR THE STUDY OF SHALLOW TWO-DIMENSIONAL STRUCTURES (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 31 (1983), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The suitability of VLF ground surveys in the investigation of shallow two-dimensional structures is analyzed. For such structures the polar formalism is derived, necessary in practice since the transmitters are generally not in the structural strike or profile. A simple vertical dike is considered to demonstrate the striking anisotropy which can be expected over such a structure, in particular the high apparent resistivity along the direction of a well-conducting dike and the low resistivity across it. The theory is then confronted with the practical example of an asymmetrical vertical dike resulting from a strike-slip fault. Modelling of the survey results is very successful and yields good confirmation of the polar behaviour. VLF ground surveys thus provide a quick and powerful tool for the study of geological accidents within about 100 m of the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1983.tb01100.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Pioneer Leaders in Plant Pathology: F.D. Heald (1983)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Phytopathology 21 (1983), S. 13-20 
    Details
    ISSN: 0066-4286
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.py.21.090183.000305
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Transition-state structural features for anilide hydrolysis from .beta.-deuterium isotope effects (1984)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 106 (1984), S. 1457-1461 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00317a045
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Chromosomal evolution in Saccharomyces (2000)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 405 (2000), S. 451-454 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The chromosomal speciation model invokes chromosomal rearrangements as the primary cause of reproductive isolation. In a heterozygous carrier, chromosomes bearing reciprocal translocations mis-segregate at meiosis, resulting in reduced fertility or complete sterility. Thus, chromosomal ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35013058
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    An iterative linearized optimization technique for non-linear ill-posed problems applied to cardiac activation time imaging (2001)
    Bradford : Emerald
    Compel 20 (2001), S. 676-688 
    Details
    ISSN: 0332-1649
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: A promising approach for the solution of the electrocardiographic inverse problem is the calculation of the cardiac activation sequence from body surface potential (BSP) mapping data. Here, a two-fold regularization scheme is applied in order to stabilize the inverse solution of this intrinsically ill-posed problem. The solution of the inverse problem is defined by the minimum of a non-linear cost function. The L-curve method can be applied for regularization parameter determination. Solving the optimization problem by a Newton-like method, the L-curve may be of pronged shape. Then a numerically unique determination of the optimal regularization parameter will become difficult. This problem can be avoided applying an iterative linearized algorithm. It is shown that activation time imaging due to temporal and spatial regularization is stable with respect to large model errors. Even neglecting cardiac anisotropy in activation time imaging results in an acceptable inverse solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/03321640110393644
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Spin density distribution of the conduction electrons in diperylene hexafluorophosphate analysed by high-resolution NMR (2000)
    Springer
    The European physical journal 15 (2000), S. 21-27 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 76.60.Cq Chemical and Knight shifts - 71.20.-b Electron density of states and band structure of crystalline solids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: High-resolution 13C nuclear magnetic resonance with 1H cross polarization and 1H decoupling under magic angle spinning is measured for the quasi-one dimensional organic conductor diperylene hexafluorophosphate (including tetrahydrofurane solvent molecules) at temperatures between 160 K and 270 K. Ab initio molecular orbital calculations are used for chemical shift analysis and for assignment of Knight shifted lines and individual carbon positions. The coexistence of neutral perylene molecules and perylene radicals in the same radical cation salt is revealed. From Knight and chemical shifts we were able to distinguish two inequivalent perylene radicals within the conducting stack. The spin density distribution of the molecular electronic wave function is determined quantitatively for these radicals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510051095
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Magnetic properties of the cyclic spincluster Fe6:bicine (2003)
    Springer
    The European physical journal 33 (2003), S. 321-330 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 33.35.+r Electron resonance and relaxation – 36.40.-c Atomic and molecular clusters – 75.20.-g Diamagnetism, paramagnetism, and superparamagnetism – 75.75.+a Magnetic properties of nanostructures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The magnetic properties of the cyclic compound [Fe6(bicine)6] LiClO4 . 2MeOH are reported. The cluster Fe6(bicine)6 forms an antiferromagnetically coupled ring structure of Fe III ions. The magnetic susceptibility is measured between 2 and 300 K and yields the exchange coupling of J/k B = - 27.5±0.5 K. The field dependence of the magnetic moment is studied at 3 and 6 K in magnetic fields up to 5 T. The zero-field splitting of the first excited spin states with S = 2 and 3 are determined by ESR at 94 GHz. The intra-molecular interactions of the Fe III ions are analyzed and the on-site anisotropy of the Fe III due to the ligand-configuration is determined to d /k B = - 0.633±0.008K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2003-00172-9
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Competing polarization mechanisms in the heavy-fermion paramagnet CeCu 6 (2002)
    Springer
    The European physical journal 26 (2002), S. 199-209 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 76.60.-k Nuclear magnetic resonance and relaxation – 75.20.Hr Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Nuclear magnetic resonance (NMR) and relaxation of 63Cu and 65Cu in a powder sample of the heavy-fermion paramagnet CeCu6 is measured and analysed quantitatively. Five different Cu sites are accessible to a detailed analysis. We derive quadrupolar splitting frequencies, Ce to Cu transferred hyperfine field coupling constants, and transversal as well as longitudinal relaxation behaviour. Only small relaxation anomalies are observed at the orthorhombic to monoclinic structural phase transition of CeCu6. We point to the different importance of transferred hyperfine interaction and local conduction electron density for static or dynamic part, respectively, of Cu hyperfine interaction. The different sign of the transferred hyperfine interaction from Ce3+ to different Cu neighbours reveals the different competing interaction mechanisms, giving rise to the heavy-fermion paramagnetic behavior of CeCu6.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e20020081
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Size quantization of electronic states in very thin platinum films (1980)
    Springer
    The European physical journal 39 (1980), S. 287-297 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Quantum Size Effect (QSE) is expected to exist in metal films. It has been discussed in a number of theoretical papers. The experimental verification is difficult because of the very short Fermi wave length of the charge carriers in metals. Surface roughness of the films and diffuse scattering of the charge carriers from the film surface usually prevent the observation of QSE. We succeeded in preparing Pt-films with surface roughness below 0.3 nm, which also exhibited partly specular reflection of the electrons from the film surface. Oscillations of the conductivity with the film thickness, due to QSE, were observed in the thickness range from 0.5 nm to 2.0 nm. Band splitting was observed in the thickness range from 5 nm to 20 nm by means of tunneling spectroscopy. From the results we suggest that electrons as well as holes in closed Fermi surfaces participate in the QSE. Holes in open Fermi surfaces, despite their larger density, could not be observed. The measurements allow the determination of the Fermi energy and the effective masses of both electrons and holes in quasi amorphous films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01305827
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Early stages of chemically induced liver carcinogenesis by oral administration of the antihistaminic methapyrilene hydrochloride (1983)
    Springer
    Journal of cancer research and clinical oncology 106 (1983), S. 53-57 
    Details
    ISSN: 1432-1335
    Keywords: Methapyrilene ; Liver tumor ; Preneoplasia ; Adenosine-5-triphosphatase ; γ-Glutamyltranspeptidase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The antihistaminic drug methapyrilene hydrochloride, which induces liver tumors in rats, was administrated orally to female Wistar rats. The animals were killed after 21, 38, 77, 119, 181, and 196 days. The activities of adenosine-5-triphosphatase (ATPase) and γ-glutamyltranspeptidase (γ-GT) in the liver were investigated histochemically. At 21 days, a homogeneous decrease of ATPase activity as well as a slight increase of γ-GT activity was found in the periportal zone. Additionally, after 38 days hepatocellular foci with reappearance of γ-GT occurred mainly in the periportal zone. After 119 days, foci with increased γ-GT activity as well as a significant reduction of ATPase activity could be observed predominantly in the periportal region. The size and number of these putative preneoplastic foci were increased according to the time of administration of methapyrilene hydrochloride. After 181 days of methapyrilene hydrochloride treatment three of five animals developed hyperplastic nodules with corresponding alterations of enzyme activities. Methapyrilene hydrochloride — a carcinogen with an unknown mechanism of reaction-produces preneoplastic changes that are analogous to the well known preneoplastic lesions in the liver observed after administration of other carcinogenic agents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00399897
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...