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  • 1
    Electronic Resource
    Electronic Resource
    Diversification in local government tax structures
    Amsterdam : Elsevier
    Regional Science and Urban Economics 10 (1980), S. 275-285 
    Details
    ISSN: 0166-0462
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Architecture, Civil Engineering, Surveying , Geography , Sociology , Economics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0166-0462(80)90031-9
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  • 2
    Electronic Resource
    Electronic Resource
    High-performance liquid chromatographic determination of rutaecarpine in rat plasma: application to a pharmacokinetic study
    Amsterdam : Elsevier
    Journal of Chromatography B: Biomedical Sciences and Applications 655 (1994), S. 27-31 
    Details
    ISSN: 0378-4347
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0378-4347(94)80128-2
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  • 3
    Electronic Resource
    Electronic Resource
    Pharmacokinetics of honokiol after intravenous administration in rats assessed using high performance liquid chromatography
    Amsterdam : Elsevier
    Journal of Chromatography B: Biomedical Sciences and Applications 655 (1994), S. 41-45 
    Details
    ISSN: 0378-4347
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0378-4347(94)00031-X
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  • 4
    Electronic Resource
    Electronic Resource
    Transmission electron microscopy and Auger electron spectroscopy of silicon-on-insulator structures prepared by high-dose implantation of nitrogen (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 4605-4613 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of substrate temperature and ion dose on silicon-on-insulator structures prepared by nitrogen implantation were characterized by transmission electron microscopy and Auger electron spectroscopy. Substrate temperatures below 200 °C during implantation result in amorphous surface layers that become polycrystalline after annealing. Implantation above 800 °C leaves the surface single crystalline containing a high density of defects. The majority of these defects are removed after annealing. High nitrogen doses (1.6×1018 cm−2 at 150 keV) resulted in two nitride layers separated by a porous region. This porous region may be attributed to the creation of N2 gas. A continuous nitride layer, without a porous region, was formed using a nitrogen dose of 9.4×1017 cm−2. When a nitrogen dose of 4×1017 cm−2 is used, however, it results in a two-phase layer containing amorphous nitride and Si crystallites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336228
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of electron-hole correlation on acoustic phonon broadening of bound exciton spectra (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 761-763 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is well-known, experimentally, that bound exciton lines are extremely sharp, particularly in comparison to other related spectra. This has not been theoretically explained. We show here that this is due to the electron-hole correlation, which effectively suppresses the electron-phonon interaction and thus the associated spectral broadening. Using appropriate correlated exciton wave functions together with the deformation potentials and the piezoelectric coupling for the acoustic phonons, we obtain exciton line widths in good agreement with experiment. Our results have direct application to the recently demonstrated blue-green injection laser.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112982
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  • 6
    Electronic Resource
    Electronic Resource
    Metal Rapid Prototype Fabrication Using Selective Laser Cladding Technology (2000)
    Springer
    The international journal of advanced manufacturing technology 16 (2000), S. 681-687 
    Details
    ISSN: 1433-3015
    Keywords: Keywords: Laser material processing; Rapid prototyping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Non-metallic rapid prototyping has been successfully applied in several industries, but a metal rapid prototype is required for functional prototypes and tooling applications. A metal rapid prototype fabricated using selective laser cladding is presented in this paper. Laser cladding is one type of laser surface treatment process. During this process, an alloy is fused onto the surface of a substrate. Laser cladding devices, i.e. powder feeder, CNC workstation table, laser shutter, and shielding gas controller, were integrated to make automatically any cladding profile possible. The metal prototype was then fabricated layer by layer. This is called the selective laser cladding system (SLC). The fabrication of the metal rapid prototype using SLC technology is described and the detailed design and construction of the SLC is presented in this paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001700070039
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  • 7
    Electronic Resource
    Electronic Resource
    Ductile-to-brittle transition of rubber-modified polypropylene (1988)
    Springer
    Journal of materials science 23 (1988), S. 2521-2532 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The irreversible deformation mechanisms of polypropylene (PP) blended with an ethylenepropylene rubber (EPR) were investigated in the region of the ductile-to-brittle (D-B) transition. The nature of the D-B transition over the composition range of 0 to 25% EPR was studied as a function of temperature and strain rate. Optical microscopy and scanning electron microscopy were used to examine the irreversible microdeformation processes in the fractured specimens. At −40° C, the controlling irreversible deformation process in PP was crazing. In the blends, two kinds of damage zones were observed: a diffuse zone due to voiding at rubber particles and an intense damage zone due to craze-like damage and deformation bands. In general, the size and density of the damage zones increase in a gradual manner through the D-B transition whether examined as a function of temperature, strain rate or blend composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01111912
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  • 8
    Electronic Resource
    Electronic Resource
    Ductile-to-brittle transition of rubber-modified polypropylene (1988)
    Springer
    Journal of materials science 23 (1988), S. 2533-2545 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The deformation behaviour of blends of polypropylene (PP) with ethylene-propylene rubber was studied as a function of temperature and composition under tension. The damage ahead of the deliberately introduced defect was traced quantitatively as a function of external load with the aid of intensity analysis. In unmodified PP or in rubber-modified blends, no stable crack growth was obtained up to 99% of the maximum stress. However, a hierarchy of failure events was observed. First, there was a gradual occurrence of a fan-shaped damage zone. Then an intense damage zone initiated. Finally, a slow tearing mode of crack growth occurred at the maximum stress and the sample failed. The size and shape of the damage zone were influenced by temperature, composition and the artificially introduced stress-raiser. Voids were dominant in the fan zone with some crazes close to the intense damage zone. In the intense damage zone, the crazes coalesced to form a network of deformation bands. The description of the fan zone was achieved by a non-linear or elastoplastic failure approach, analogous to the Hilton-Hutchinson formalism, and the analysis of the intense zone by a critical stress instability criterion. There was also a fair correlation with the Dugdale model for the growth of a wedge-like intense damage zone in the specific case of unmodified PP at −40° C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01111913
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of gaseous composition on cell growth and secondary metabolite production in suspension culture of Stizolobium hassjoo cells (2000)
    Springer
    Bioprocess engineering 23 (2000), S. 585-593 
    Details
    ISSN: 0178-515X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The gaseous composition is an important factor affecting the performance of plant cell cultures. Gaseous metabolites, especially O2, CO2 and C2H4, play important roles in cell physiology. Forced aeration in bioreactors usually results in poor cell growth and secondary metabolite production. In this work, the effects of gaseous metabolites on cell growth, secondary metabolite formation as well as PPO activity were investigated with respect to Stizolobium hassjoo cell culture producing l-DOPA (3,4-dihydroxyphenylalanine). A device allowing the control of the partial pressures of gaseous metabolites in shake flasks was designed. In addition, a recirculating gas system with a P O 2 controller was designed for a bioreactor. This device could maintain constant P O 2 and P CO 2 in the bioreactor headspace. The results showed that the highest l-DOPA content was attained at P O 2=0.30 atm. Higher P O 2 values retarded cell growth and increased the pH of the culture broth. High P O 2 also enhanced the formation of ethylene and inhibited l-DOPA formation. Carbon dioxide concentrations lower than 5% enhanced cell growth and l-DOPA formation. Cell growth was retarded by 0.3 ppm of ethylene in 2∼5 carbon dioxide. Oxygen concentration and D.O. in the broth could be controlled at constant levels in the recirculating culture system. Enrichment of P O 2 up to 0.3 atm during the later stage of cultivation facilitated l-DOPA formation. The interaction among the gaseous metabolites and their influences on cell metabolism and l-DOPA formation were elucidated. This information will facilitate the rational operation of plant cell culture systems producing secondary metabolites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004490000204
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