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  • 1
    Electronic Resource
    Electronic Resource
    Single-point method of identification of magneto-hydrodynamic discontinuities (1979)
    Springer
    Astrophysics and space science 62 (1979), S. 29-33 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract For each type of discotinuity the magneto-hydrodynamic relationships are reduced to a set of necessary relations between the parameters at both sides of the shock. The relations which do not contain the pressure are used in the method proposed. The distance in the space of the parameters between the point corresponding to the experimental data and the nearest point exactly satisfying the relations is obtained for each case. Supposition is made that the shortest distance conforms to the most probable type of discontinuity. As an illustration of the proposed method several events of discontinuities experimentally registered in the interplanetary space are considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00643900
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal and Sintering Behaviour of Basalt Glasses and Natural Basalt Powders (1999)
    Springer
    Journal of thermal analysis and calorimetry 56 (1999), S. 931-938 
    Details
    ISSN: 1572-8943
    Keywords: Bulgarian basalt ; glass-ceramics ; glasses ; heat capacity ; Spanish basalts ; thermal methods
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A study of three Spanish and one Bulgarian basaltic rock demonstrated that, after thermal treatment at temperatures higher than 800°C, crystallization of pyroxenes, anorthite and magnetic occurred. Following sintering of the original basalts and powdered original glasses, the same crystalline phases were nucleated and grown in the resulting glass-ceramics. Chemical and DTA/TG analyses suggested similar behaviour for the synthesized Canarian basalt glasses, which are located in the tephrite-basanite field, and different behaviour for the trachy-andesite Canarian and the basaltic-andesite Bulgarian basalt glass. In consequence of the high sensitivity of the specific heat to phase transformations, Cp(T) and TMA experiments allowed a distinction between the tephrite-basanite and trachy-andesite Canarian glasses on the basis of their different thermal behaviour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010151416504
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  • 3
    Electronic Resource
    Electronic Resource
    Small angle X-ray scattering (SAXS) studies of sol to gel transition in K2O-Al2O3-SiO2 system (1996)
    Springer
    Journal of materials science 31 (1996), S. 1341-1344 
    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 structural evolution during a sol to gel transition reaction in the K2O-Al2O3-SiO2 system was investigated by using in situ small angle X-ray scattering (SAXS) technique. The results are interpreted as evidence of the presence of at least two different gel phases. The analysis shows that the primary phase is composed of small particles with characteristic size of ∼3.0 nm, and considerable size and shape variation. The primary phase is identified as a random phase in the Debye sense. The primary particles aggregate into larger formations with spherical symmetry. The size of larger aggregates (second phase) increases continuously in the course of gelation and levels off after reaching ∼15.0 nm. The volume fraction of the second phase keeps increasing until the end of the measurement which is far after the gelation (3-fold of the gelation time).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00353115
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  • 4
    Electronic Resource
    Electronic Resource
    An algorhythm for the recognition of heart rate disturbances (1971)
    Springer
    Medical & biological engineering & computing 9 (1971), S. 221-228 
    Details
    ISSN: 1741-0444
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract A method of analysing heart rhythm disturbances by observing theR-R interval in the ECG is described. Pulses are divided into normal and abnormal depending on whether or not they come within the pre-determined time range. Heart rhythm disturbances are expressed by dividing an arbitrary sequence into specific groups, namely interpolated extrasystoles, extrasystoles, tachycardia, blocked (single delayed) pulse, groups of delayed pulses and bradycardia. An information device, Andros R, incorporating the principles of this method, is described as well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02474817
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  • 5
    Electronic Resource
    Electronic Resource
    Isomeric yield ratio of134I in photofission of232Th and238U (1991)
    Springer
    Journal of radioanalytical and nuclear chemistry 155 (1991), S. 299-309 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The isomeric yield ratios for134I, for the photofission of232Th and238U with 25-MeV bremsstrahlung have been determined using radiochemical techniques and γ-spectrometry. Angular moment a of the corresponding fission fragments, Jrms, were calculated by the statistical procedure of Huizenga and Vandenbosch. We have discovered a significant proton odd-even effect on Jrms values, and demonstrated its dependence on the nuclear structure of fragments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02163877
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  • 6
    Electronic Resource
    Electronic Resource
    Structure and mechanical properties of highly oriented poly(ethylene terephthalate) films (1992)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 32 (1992), S. 964-970 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The relationships between the supermolecular structure of poly(ethylene terephthalate) films subjected to cold drawing and subsequent zone annealing and their mechanical properties are investigated. The effectiveness of zone annealing is compared to that of annealing with fixed ends. Microstructural changes occurring during heat treatment and zone annealing are monitored using wide angle X-ray scattering, small angle X-ray scattering, infrared spectroscopy, differential scanning calorimetry, and static mechanical tests. The very high modulus and strength of the zone-annealed films are directly attributed to the large number of the molecules connecting the crystallites.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760321408
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  • 7
    Electronic Resource
    Electronic Resource
    Evolution of nanometer voids in polycarbonate under mechanical stress and thermal expansion using positron spectroscopy (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 33 (1995), S. 77-84 
    Details
    ISSN: 0887-6266
    Keywords: positron lifetime ; free volume ; polycarbonate ; yielding ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Positron Annihilation Lifetime Spectroscopy (PALS) measurements were conducted on polycarbonate subjected to either thermal expansion or to tensile and compressive strains. It was found that thermal expansion affected both the nanometer hole size and the hole number density, whereas mechanical stress affected mainly the size of existing holes, and did not generate or eliminate holes in the quasielastic deformation region. The effect of stress on yield and postyield behavior of this glassy material was also investigated. The deduced hole volume fraction of this polymer at 25°C was 6.8 ± 0.5% from the thermal expansion experiment and 7.2 ± 1.2% from the mechanical loading experiment. When the specimen was under compression, the hole volume fraction was found to continuously decrease. This can be considered as evidence of the inability of the free volume concept in explaining the yield behavior of glassy polymers. ©1995 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1995.090330109
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  • 8
    Electronic Resource
    Electronic Resource
    Interatomic correlation in partially oriented polymer fibers (1991)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 29 (1991), S. 883-888 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The atomic ordering in materials possessing cylindrical symmetry can be investigated by an approximation of the cylindrical distribution function in a given direction. The approximation gives correctly the extent of the interatomic correlation for a wide class of polymer fibers and reduces considerably the amount of the experimental and computational times.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1991.090290713
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  • 9
    Electronic Resource
    Electronic Resource
    Rapid mechanical deformation of poly(ethylene terephthalate) fibers at temperatures above the glass transition (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 33 (1995), S. 125-133 
    Details
    ISSN: 0887-6266
    Keywords: mechanical deformation ; PET ; high-temperature deformation ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The mechanical properties of poly(ethylene terephthalate) (PET) fibers at temperatures above the glass transition are investigated by means of a specially constructed device. Measurements of the deformation rate and of the “dynamic” stress-strain curves of the fibers are performed in nearly isothermal regime (after initial rapid heating) in a temperature interval 100-200°C. The results reported in the present work demonstrate that the high-temperature mechanical characteristics of rapidly crystallizing polymers can be deduced to a satisfactory precision, while keeping the crystallinity development at low level. Our investigations indicate that if the high-temperature deformation is sufficiently fast, the polymer behavior is similar to the deformation at sub-Tg temperatures. Based on this similarity, a qualitative model of the deformation in the high-temperature region is proposed. The proposed model is fundamentally equivalent to the models describing mechanical deformation of glassy polymers at temperatures below the glass transition. ©1995 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1995.090330113
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  • 10
    Electronic Resource
    Electronic Resource
    Thermal response and structure of PET fibersWork supported in part by the National Science Foundation under Grant No. CPE8304058 (1990)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 28 (1990), S. 1647-1663 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The structure and the thermal response of polyethylene terephthalate (PET) fibers, melt-spun at speeds of 3 to 6 km/min, are investigated in the temperature region 0-200'C. Differential scanning calorimetry thermograms, and radial distribution functions from wide-angle x-ray scattering are used. Interpretation of multiple glass transition and crystallization peaks and of the range of structural coherence is interpreted in terms of a nonhomogeneous molecular arrangement for fibers melt-spun at intermediate spinning speeds. A three-phase model of the molecular structure of these fibers is used to explain the results. An important feature of the model is the existence of a threadlike, interconnected, highly oriented noncrystalline phase, coexisting with a more unoriented amorphous phase. The model can qualitatively explain a number of experimental observations.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1990.090281001
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