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  • 1
    Electronic Resource
    Electronic Resource
    Structural and Morphological Characterization of Al/Ti-Based Ohmic Contacts on p-Type 4H-SiC Annealed Under Various Conditions (2000)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 338-342 (May 2000), p. 1017-1020 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/04/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.338-342.1017.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Electrical characteristics and structural properties of ohmic contacts to p-type 4H-SiC epitaxial layers (1999)
    Springer
    Semiconductors 33 (1999), S. 1206-1211 
    Details
    ISSN: 1063-7826
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Epitaxial films grown by low-temperature liquid phase epitaxy on p-type 4H-SiC were used as strongly doped subcontact layers for making low-resistance contacts to the p-type material. The layers had a bulk resistivity of ∼0.02 Ω · cm and an aluminum atom concentration of ∼1.5×1020 cm−3. The absence of polytype inclusions and the distinct crystalline quality of the strongly doped subcontact layers was confirmed by x-ray diffraction methods. Ohmic contacts with resistivities less than 10−4 Ω · cm2 were prepared by depositing and then annealing multilayer metal mixtures containing Al and Ti. The structural properties and energy characteristics of the resulting ohmic contacts are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1187850
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  • 3
    Electronic Resource
    Electronic Resource
    On the non-Gaussian nature of wind waves (1995)
    Springer
    Physical oceanography 6 (1995), S. 241-245 
    Details
    ISSN: 0928-5105
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The asymmetry and curtosis for different wave conditions have been computed using experimentally-derived measurement data on sea surface roughness. It is shown that the asymmetry and curtosis values are essentially different from zero and practically do not depend on the slope of waves and their age.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02197522
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  • 4
    Electronic Resource
    Electronic Resource
    Measurement of wind waves by means of a buoy accelerometer wave gauge (1993)
    Springer
    Physical oceanography 4 (1993), S. 399-407 
    Details
    ISSN: 0928-5105
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract An accelerometer buoy wave gauge developed in the Marine Hydrophysical Institute of the Ukrainian Academy of Sciences is described. This allows measurement of acceleration and the sea surface elevation in the system of reference connected with a buoy. The integral and frequency spectral characteristics of waves can be computed from the records of the wave gauge signal. The use of a buoy accelerometer at sea provides a possibility to derive effective information on the wind waves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02198503
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  • 5
    Electronic Resource
    Electronic Resource
    The magnetic transformation of iron hydroxides under the action of micro-organism (Azotobacter vinelandii) (abstract) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 7182-7182 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: To analyze the action of Azotobacter vinellandii intact cells on synthetic high-dispersed iron hydroxides, Mössbauer spectroscopy and magnetic measurements were used for different conditions: for the nitrogen-free medium and for the NH-containing medium. The preparations of Azotobacter vinelandii obtained on the nitrogren-free medium with decreased acidity is characterized by relatively high contents of paramagnetic combinations (χpar=(6.6...31.4)×10−6 sm3/g, Isat=(0.12...0.73)×10−3 at 12 day cultivations, χpar=(8.1...23.2)×10−6 sm3/g, Isat =(0.07−0.93)×10−3 at 35 day cultivation). The quantity of magnetic ordered combinations in these samples is greater than 1.5–7 times that in bacteria at pH=7. The paramagnetic attributes of samples in the medium with NH is decreased more in 12 day culture (up to 50% compare to nitrogen-free variation) then in 35 day culture (up to 20%). The presence of doublets in Mössbauer spectra at different conditions (room temperature in damp, air-dry states, and frozen at the 100 K state) and strong differences in probability of sorption of Mössbauer radiation of damp preparations allow us to conclude that magnetic ordered combinations in the type of crystallines with particle size 〈10 nm are present in the composition of preparations. It is found from magnetic measurements that at pH〈7 the paramagnetic component of susceptibility and magnetic saturation is high. At pH=7 the most intensive decrease of susceptibility and magnetic saturation is medium with nitrogen and at large aeration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356690
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  • 6
    Electronic Resource
    Electronic Resource
    The testing of action of chemical extracts on soils by magnetic methods (abstract) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 7183-7183 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The participation of soil iron in the formation of physics-chemical features in feed of plants and microorganisms is well known. Because of the active role of Fe in soil landscapes the Fe state is taken into account in investigations of the genesis of soils. In spite of a relatively high content of iron in soils up to 40%–45% (relative to Fe) its numerical forms are diagnosed in a complex way by Ronthgen diffractometry, differential thermal analysis, and microscopy. Thus, chemical extracts are widely used in soil science. Extracted Fe is considered to be of amorphous, strong or weak crystallized forms. These gradations are of wide use but they are not correct. This is established by some authors by means of magnetic measurements and Mössbauer spectroscopy [Jeanory et al., Sci. Solids 135 (1986)] before and after magnetic separation and chemical extracts [Fine and Singer, Soil Sci. Soc. Am. J. 53, 191 (1989)]. We used the measurements of magnetic susceptibility and saturation and nuclear gamma resonance for the usual soils and electron paramagnetic resonance for weak magnetic Fe containing minerals (before the extract). Our results are comparable with the above research and lead to the next conclusions: (1) ordered alternations of magnetic parameters and results of action of extracts are absent; (2) the Mehra–Jackson extract (sometimes the Tamm's extract) often extracts the crystallized magneticordered and paramagnetic silicate and superparamagnetic forms of Fe; (3) magnetic susceptibility and magnetic saturation increase in some types of soils (brown earth, ferralsol, alluvial soil) at dissolution of the alumosilicate part of soils because of enrichment by chemically strong particles of magnetite; (4) the conclusions on extracts (as far as crystallized silicate amorphous forms) do not have generalized characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356667
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  • 7
    Electronic Resource
    Electronic Resource
    The magnetic diagnostics of cosmic and industrial silt in humus horizons of soils (abstract) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 7184-7184 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In the early 50s the increase of magnetic susceptibility in head horizons of soils has been observed. The reason was accepted to be forest and steppe fire. Later we discovered that the increasing of susceptibility and magnetic saturation was observed more clearly in the soils developed on weak magnetic native rock (loam, carbonate) and the magnetic fraction was separated from these soils in a more simple fashion. An abnormal increase in magnetic parameters is observed in primitive soils and the debris layer of dry forest (particularly of pine forest). The investigations have shown that magnetic particles (MP) are contained in ash of electrostations, in buried and modern soils, in humocoll and coal sheets, and in air of industrial cities and of the country. A high magnetic separated fraction (MV) contains particles (P) that differ by morphology and color. MF of soils is separated in a difficult manner from the rest mass (it also contains α-Fe, magnetite, hematite) and is contaminated by magnetic particles from native rock. We obtained that only spherical particles contribute to the soil magnetism from (10...50)×10−6 sm3/g to (100...150)×10−6 sm3/g. MP come into modern soils from all sources. Magnetic particles are well conserved in automorphic and nonlogging buried soils, and in humocoll layers. Among humocoll layers investigated by us there were layers dating over 50 thousand years ago.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356668
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  • 8
    Electronic Resource
    Electronic Resource
    Komsomol-youth brigade of steelmaker V. Bezdenezhnyi (1962)
    Springer
    Metallurgist 6 (1962), S. 457-458 
    Details
    ISSN: 1573-8892
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00740011
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  • 9
    Electronic Resource
    Electronic Resource
    Reconstruction of the ceramic recuperators of soaking pits (1963)
    Springer
    Metallurgist 7 (1963), S. 455-457 
    Details
    ISSN: 1573-8892
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00737649
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  • 10
    Electronic Resource
    Electronic Resource
    Guniting the lining of heating furnaces of rolling mills (1980)
    Springer
    Refractories and industrial ceramics 21 (1980), S. 250-254 
    Details
    ISSN: 1573-9139
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions Guniting mass compositions and a procedure for guniting worn brickwork of continuous heating furnaces of rolling mills have been developed. At a number of metallurgical factories the worn brickwork of eight continuous heating furnaces of rolling mills have been repaired by guniting. The use of guniting enables the period between furnace lining repairs to be doubled (from 1 to 2 years), the volume of brickwork repair and the length of the repair work to be reduced, and a saving of 5000 rubles per annum per furnace to be obtained (merely by reducing the amount of repair work). Using IR spectroscopy the authors have investigated hydration and dehydration in alumina and high-alumina cements and aluminosilicate guniting masses with additives of these cements. They have shown that during guniting by the semidry method, hydration of the cements included in the composition of the gunite coatings does not go to completion and ends in the stage of formation of CaO·Al2O3·10H2O; dehydration of the gunite coatings is completed below 300°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01387685
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