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  • 11
    Electronic Resource
    Electronic Resource
    Anisotropic strains and magnetoresistance of La0.7Ca0.3MnO3 (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 977-979 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thin films of perovskite manganite La0.7Ca0.3MnO3 were grown epitaxially on SrTiO3(100), MgO(100) and LaAlO3(100) substrates by the pulsed laser deposition method. Microscopic structures of these thin film samples as well as a bulk sample were fully determined by x-ray diffraction measurements. The unit cells of the three films have different shapes, i.e., contracted tetragonal, cubic, and elongated tetragonal for SrTiO3, MgO, and LaAlO3, respectively, while the unit cell of the bulk is cubic. It is found that the samples with a cubic unit cell show smaller peak magnetoresistance at low fields ((approximately-less-than)1 T) than the noncubic ones do. The present result demonstrates that the magnetoresistance of La0.7Ca0.3MnO3 at low fields can be controlled by lattice distortion via externally imposed strains. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.119705
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  • 12
    Electronic Resource
    Electronic Resource
    Screening of hexavalent chromium biosorbent from marine algae (2000)
    Springer
    Applied microbiology and biotechnology 54 (2000), S. 597-600 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract  A highly chromate-selective biosorbent with high adsorption capacity was found by examining the chromate adsorption capacities of 48 species of red, brown, or green marine algae sampled from the east coast of Korea. As a result of screening, a red marine alga showed excellent adsorption characteristics. It was identified as Pachymeniopsis sp. The timing of the sampling of Pachymeniopsis sp. did not affect the adsorption capacity of the alga but the optimum period for mass collection was April–May. The alga also showed high selectivity for chromate and its adsorption capacity for other heavy metal ions such as cadmium and manganese was relatively low. An investigation of the adsorption isotherm of Pachymeniopsis sp. as a dried powder for chromate adsorption at 25 °C showed Langmuir-type dependence. The maximum chromate adsorption capacity of the selected alga was about 225 mg/g. The desorption of adsorbed chromate from Pachymeniopsis sp. was done by treating samples with 1 N NaOH. It was confirmed that ion exchange type adsorption was observed with anion exchangers but not with cation exchangers. Therefore it is believed that the chromate adsorption is based on the anionic exchange of Pachymeniopsis sp.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530000367
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  • 13
    Electronic Resource
    Electronic Resource
    Screening of hexavalent chromium biosorbent from marine algae (2000)
    Springer
    Applied microbiology and biotechnology 54 (2000), S. 445-448 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A high-chromate-selective biosorbent with high adsorption capacity was sought by examining the chromate adsorption capacities of 48 species of red, brown, or green marine algae sampled from the east coast of Korea. Screening showed a red marine alga to have the most excellent adsorption characteristics among them, and it was identified as Pachymeniopsis sp. The period at which Pachymeniopsis sp. was sampled did not affect the adsorption capacity of the alga, but the optimum period for mass collection was April to May. The alga also showed high selectivity for chromate since its adsorption capacity for other heavy metal ions such as cadmium and manganese ions was relatively low. An investigation of the adsorption isotherm of dried powder of Pachymeniopsis sp. for chromate adsorption at 25 °C showed a Langmuir-type dependence. The maximum chromate adsorption capacity of the selected alga was about 225 mg/g. Desorption of the adsorbed chromate from Pachymeniopsis sp. was done by treating the sample with 1 N NaOH. It was confirmed that ion exchange type adsorption was observed with an anion exchanger but not with a cation exchanger. It is therefore believed that the chromate adsorption is based on anionic exchange of Pachymeniopsis sp.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530000387
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  • 14
    Electronic Resource
    Electronic Resource
    OEIC research in Korea (1995)
    Springer
    Optical and quantum electronics 27 (1995), S. 305-317 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract This paper presents a chronological overview of Korean activities in optoelectronics and optoelectronic integrated circuits (OEICs) undertaken mainly in university laboratories. OEIC transmitters and receivers for communications and semiconductor laser logic devices for optical switching and computing are briefly described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00563565
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  • 15
    Electronic Resource
    Electronic Resource
    Utility of a probability-density-function curve and F-maps in composite-material inspection (1982)
    Springer
    Experimental mechanics 22 (1982), S. 155-160 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The use of probability-density-function analysis, an important topic in statistical analysis, is studied in this paper with respect to its utility in nondestructive testing. In addition to the mathematical concepts, several sample problems in composite-material inspection are presented. A feature map (or F-map) is introduced as a new procedure that gives us a new way to examine composite materials. A probability-density function is basically a plot of number of times a particular value per unit value occurs vs. the value itself. A feature is defined as a parameter measured or calculated from an ultrasonic waveform. Some examples are center frequency, rise time, pulse duration, attenuation at frequencyf, and so forth. Probability-density curves are estimated for each of the features derived from a waveform. These curves are then used to assist in the production of F-maps. Sample problems in graphite-polyimide structures and boron-aluminum materials using these curves and F-maps are given. An inspectability parameter based on feature probability-density-function analysis is introduced for a compositematerial fabrication process that makes damage detection more reliable. F-maps are then used to determine the extent of damage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02325545
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    Paper (German National Licenses)
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