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  • 1
    Electronic Resource
    Electronic Resource
    Electron–inert gas pseudopotentials for use in path integral simulations (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 3444-3447 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A method is devised to obtain an 1=0 pseudopotential for the electron–argon system using the local density functional approximation. The quality of the potential is checked against low-energy scattering data and is found to be good. The method should generalize quite simply to other inert gas–electron and to closed-shell ion–electron systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450966
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  • 2
    Electronic Resource
    Electronic Resource
    High-order correction to the Trotter expansion for use in computer simulation (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 5094-5100 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A convenient form of the generalized Trotter formula for path-integral simulations has been investigated for various systems and proves to be much better than the primitive. The hydrogen atom, which is pathological for the primitive algorithm, is solved by the new method but the results are not completely satisfactory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452653
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  • 3
    Electronic Resource
    Electronic Resource
    Inverse Problem for Composites with Imperfect Interface: Determination of Interfacial Thermal Resistance, Thermal Conductivity of Constituents, and Microstructural Parameters (2000)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 83 (2000), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: An explicit method is introduced to solve inverse problems for composites with imperfect interfaces. We apply the method to determine the thermal conductivity of constituents and the interfacial thermal resistance in SiC-particulate-reinforced aluminum-matrix composites and to estimate the whisker thermal conductivity, the interfacial thermal resistance, and the whisker alignment distribution in two types of SiC-whisker-reinforced lithium aluminosilicate glass-ceramic composites from their measured effective thermal conductivity reported in the literature. Certain bounds for these three properties of both SiC-whisker-reinforced glass-ceramic composites are obtained, and reasonable estimates for their exact values from room temperature to 500°C are made. The inverse problem is quite sensitive to noise in the measurements. We also comment on existing estimates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2000.tb01284.x
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  • 4
    Electronic Resource
    Electronic Resource
    Wavelet power spectrum analysis of heterogeneities from sonic velocity logs[Paper pres] (1998)
    Oxford BSL : Blackwell Publishing Ltd
    Geophysical prospecting 46 (1998), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The continuous wavelet transform (CWT) is used to evaluate local variations in the power-law exponents of sonic log data. The resulting wavelet spectrum can be compared with the corresponding global estimates obtained by conventional Fourier transform methods. In Fourier analysis, the fundamental tool used to characterize a fluctuating velocity distribution is the power spectrum. It represents the energy contained in each wavenumber and thus provides information regarding the importance of each scale of heterogeneity. However, important spatial information regarding the location of events becomes implicit in the phase angle of the Fourier transform. In this paper, it is shown how the square of the amplitude of the wavelet transform is related to the Fourier spectrum and how spatial information can be expressed in an explicit manner. Using the conservation of energy, it is shown that the average wavelet power spectrum over the total depth range is equal to the global power spectrum. A Gaussian wavelet is chosen to realize the wavelet transform. Two synthetic sonic logs with exponential and von Karman correlation functions are used to demonstrate the potential of the suggested analysis. Furthermore, the wavelet transform is applied to the KTB (Continental Deep Drilling Program) sonic log data. The wide range of applications of the CWT shows that this transform is a natural tool for characterizing the structural properties of underground heterogeneities. It offers the possibility of separating the multiscale components of heterogeneities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2478.1998.00106.x
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  • 5
    Electronic Resource
    Electronic Resource
    Elimination of higher modes in dispersive in-seam multimode Love waves[ Received ] (1997)
    Oxford, UK : Blackwell Science Ltd
    Geophysical prospecting 45 (1997), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: A deterministic pure phase shift filter (PPSF) is developed to extract the fundamental mode from multimode surface Love waves. Because of different phase velocities of modes and hence different phase traveltimes for a fixed travel distance between source and receiver, the deterministic PPSF can be computed, provided that the dispersion relation of the medium is estimated from the existing transmission data. The process consists of (a) applying the deterministic PPSF to the multimode wave (this step of the filtering process results in a time series in which the amplitudes of the fundamental mode appear at acausal times and the amplitudes of higher modes appear at causal times); (b) setting amplitude values equal to zero for positive times; (c) applying the inverse PPSF to the filtered signal. By using such a deterministic PPSF process, the higher modes almost disappear. The method is applied to synthetic multimode data computed by the normal-mode summation method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2478.1997.680304.x
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  • 6
    Electronic Resource
    Electronic Resource
    Elimination of ghost noise in vibroseis data by deconvolution[ Received ] (1997)
    Oxford, UK : Blackwell Science Ltd
    Geophysical prospecting 45 (1997), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: A deconvolution approach is presented to process uncorrelated vibroseis data. The recorded ground force signal, known to be a better correlator for the vibrogram than the pilot sweep itself, is used to deconvolve rather than to correlate the vibrogram. In such a way the ghost sweep (correlation noise), produced by severe harmonic distortions in the ground force signal both at negative and positive correlation times if such a signal is used as the correlator, is eliminated automatically. This type of deconvolution can eliminate the ghost sweep caused by both the upsweep or by the downsweep signal. Synthetic and real data are used to demonstrate the application of the deconvolution procedure. The results are compared with the traditional correlation procedure and show the superiority of the deconvolution approach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2478.1997.700305.x
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  • 7
    Electronic Resource
    Electronic Resource
    Preferential accumulation of d-pinitol in Acrostichum aureum gametophytes in response to salt stress (1999)
    Copenhagen : Munksgaard International Publishers
    Physiologia plantarum 105 (1999), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Growth and metabolic responses to salt stress were studied in gametophytes of Acrostichum aureum L. (a mangrove fern). Gametophytes were cultured in 0–170 mM NaCl solutions. The growth of gametophytes was best in low NaCl concentrations (35 and 85 mM), and was retarded at higher NaCl concentrations. Photosynthetic rate of gametophytes was also significantly reduced when grown in high NaCl concentrations. Severe salt stress (〉120 mM NaCl) led to a preferential accumulation of d-pinitol in gametophytes, whereas the sporophyte accumulated d-1-O-methyl-muco-inositol. The content of d-pinitol reached up to 50% of the soluble carbohydrate pool of gametophytes under 155 and 170 mM NaCl. The accumulation of d-pinitol and other cyclitols in gametophytes was correlated with the retention of photochemical efficiency of photosystem II and the survival of gametophytes after transfer to solutions containing 340 and 600 mM NaCl, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1399-3054.1999.105109.x
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  • 8
    Electronic Resource
    Electronic Resource
    A pigment-binding protein essential for regulation of photosynthetic light harvesting (2000)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 403 (2000), S. 391-395 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Photosynthetic light harvesting in plants is regulated in response to changes in incident light intensity. Absorption of light that exceeds a plant's capacity for fixation of CO2 results in thermal dissipation of excitation energy in the pigment antenna of photosystem II by a poorly ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35000131
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  • 9
    Electronic Resource
    Electronic Resource
    In vitro expression of Lac-PTS and tagatose 1,6-bisphosphate aldolase genes fromLactococcus lactis subsp.cremoris plasmid pDI-21 (1990)
    Springer
    Applied microbiology and biotechnology 33 (1990), S. 677-679 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary A 4.4-kbEcoR1-EcoR1 DNA fragment from theLactococcus lactis subsp.cremoris plasmid pDI-21 encoded the tagatose 1,6-bisphosphate (TBP) aldolase gene and the Lac-PTS genes. In vitro transcription-translation usingEscherichia coli S30 extract showed the synthesis of 41 000-, 23 000- and 12 000-dalton proteins which correspond to the TBP-aldolase. Lac-PTS enzyme II, and factor III proteins respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00604936
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  • 10
    Electronic Resource
    Electronic Resource
    Tolerance of gametophytes of Acrostichum aureum (L.) to salinity and water stress (1997)
    Springer
    Photosynthetica 34 (1997), S. 21-30 
    Details
    ISSN: 1573-9058
    Keywords: chlorophyll fluorescence ; dehydration ; fern ; NaCl ; osmotic potential ; salt stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Tolerance of gametophytes of Acrostichum aureum to NaCl and dehydration was investigated under controlled conditions following the changes in chlorophyll fluorescence parameters (Fv/Fm, qP, qN). Salt tolerance was increased by growing gametophytes in low concentrations of NaCl. However, such treatment could not increase the tolerance of gametophytes to dehydration. Under water stress, a decrease in photochemical quenching (qP) was accompanied by an increase in non-photochemical quenching (qN). Under salt stress, qP also decreased, but qN did not change significantly in salt-hardened gametophytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006851431516
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