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  • 1
    Electronic Resource
    Electronic Resource
    Conjugate observations of the day-side reconnection electric field: A GEM boundary layer campaign (1999)
    Springer
    Annales geophysicae 17 (1999), S. 443-454 
    Details
    ISSN: 0992-7689
    Keywords: Ionosphere (plasma convection ; polar ionosphere) ⋅ Magnetospheric physics (magnetosphere-ionosphere interactions).
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Data from HF-radars are used to make the first simultaneous conjugate measurements of the day-side reconnection electric field. A period of 4 h around local magnetic noon are studied during a geospace environment modeling (GEM) boundary layer campaign. The interplanetary magnetic field (IMF) was southward whilst the eastward component (By) was variable. The flow patterns derived from the radar data show the expected conjugate asymmetries associated with IMF |By| ≥ 0. High-time resolution data (50 and 100 s) enable the flow of plasma across the open/closed field line boundary (the separatrix) to be studied in greater detail than in previous work. The latitude of the separatrix follows the same general trend in both hemispheres but shows a hemispherical difference of 4°, with the summer cusp at higher latitude, as expected from dipole tilt considerations. However, the short-time scale motion of the separatrix cannot be satisfactorily resolved within the best resolution (300 m s−1) of the experiment. The orientation of the separatrix with respect to magnetic latitude is found to follow the same trend in both hemispheres and qualitatively fits that predicted by a model auroral oval. It shows no correlation with IMF By. However, the degree of tilt in the Northern (summer) Hemisphere is found to be significantly greater than that given by the model oval. The convection pattern data show that the meridian at which throat flow occurs is different in the two hemispheres and is controlled by IMF By, in agreement with empirically derived convection patterns and theoretical models. The day-side reconnection electric field values are largest when the radar’s meridian is in the throat flow or early afternoon flow regions. In the morning or afternoon convection cells, the reconnection electric field tends to zero away from the throat flow region. The reconnection electric field observed in the throat flow region is bursty in nature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-999-0443-4
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  • 2
    Electronic Resource
    Electronic Resource
    A comparison of P code and high performance C/A code GPS receivers for on the fly ambiguity resolution (1993)
    Springer
    Journal of geodesy 67 (1993), S. 185-192 
    Details
    ISSN: 1432-1394
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract Carrier phase ambiguity resolution on the fly is investigated using two receiver technologies, namely dual-frequency P code and high performance, single frequency, C/A code receivers. Both receiver types were used simultaneously in a series of land kinematic trials. A least-squares search technique is used to find the correct double difference carrier phase ambiguities. Both C/A and single frequency P code technologies are found to be equivalent and capable of resolving the integer ambiguities on the fly using some 30 to 200 seconds of data under benign multipath conditions. Successful ambiguity resolution on the fly results in cm-level accuracy kinematic positioning. The ambiguity resolution time required and success rate are however found to be strongly dependent on the level of carrier phase multipath and, as a consequence, on the error variance assigned to the carrier phase measurements. The use of widelaning with the dual frequency P code results in ambiguity resolution in seconds. The performance of widelaning is also superior in a comparatively high carrier phase multipath environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00806257
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  • 3
    Electronic Resource
    Electronic Resource
    Quantitative Structure-Activity Relationships and Mixture Toxicity Studies of Heterocyclic Nitrogen Compounds (1996)
    Springer
    Bulletin of environmental contamination and toxicology 57 (1996), S. 77 -83 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001289900158
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  • 4
    Electronic Resource
    Electronic Resource
    Dynamic Strength of Steel Welds under High Strain Rate Loading (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 9 (Sept. 2005), p. 87-92 
    Details
    ISSN: 1662-8985
    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
    Notes: An experimental study was conducted to investigate the dynamic strength of steel welds under high strain rate loadings. Flow stresses of both the base steel material and the weld filament were obtained under strain rate loadings of up to 9 × 102 s-1. The data was then fitted to the Cowper-Simmons [1] relation with the D and q values given. The finding helps to understand the strain rate sensitivity of the base and welded materials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.9.87.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Dynamic Torsional Buckling of an Embedded Double-Walled Carbon Nanotube (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 745-748 
    Details
    ISSN: 1013-9826
    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
    Notes: An elastic double-shell model based on continuum mechanics is presented to study thedynamic torsional buckling of an embedded double-walled carbon nanotube (EDWCNT). Based onthe model, a condition is derived to predict the buckling load of the EDWCNT. It is shown that thebuckling load of the EDWCNT for dynamic torsional buckling is no less than that for the statictorsional buckling. Further, the effect of the van der Waals forces is discussed when an innernanotube is inserted into an embedded outer one. In particular, the paper shows that, in the absenceof the initial van der Waals forces, the buckling load of an EDWCNT is always in-between that ofan isolated inner tube and of an embedded outer nanotube, which is different from the resultobtained by neglecting the difference of radii. This indicates that disregarding the difference of theradii of the double-walled nanotubes can not properly describe the effect of the van der Waalsforces between interlayer spacing
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.745.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Tensile Properties and Deformation-Fracture Behavior of Ti-6Al-4V Alloy at Cryogenic Temperature (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 207-210 
    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
    Notes: Tensile properties and deformation-fracture behavior at temperatures ranging from 123Kto 293K of a Ti-6Al-4V alloy sheet with a thickness of 1.5mm has been studied, and the effects oftesting temperature, specimen orientation and heat-treatment were investigated. An increase instrength and a decrease in fracture strain were found with decreasing tension temperature, and theanisotropy in tensile properties was observed at room and cryogenic temperatures both in the annealedand solution treated and aged (STA) specimens. TEM examinations indicated that plastic deformationoccurred within both α and β phases in the STA specimens testing at either room or cryogenictemperature. The dominant deformation mechanism varied from dislocation slip at room temperatureto twinning at 123K. SEM observations showed that the amount of dimples and tearing grains onfractured surfaces of the specimens decreased as testing temperature was decreased
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.207.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Nucleation and Crystallization Kinetics in a ZBLAN Glass (1991)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 32-33 (Jan. 1991), p. 179-184 
    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.32-33.179.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Scattering Losses in Fluoride Optical Fibers (1991)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 32-33 (Jan. 1991), p. 495-500 
    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.32-33.495.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Phase Separation and Crystallization in Lead Containing Fluorozirconate Glasses (1991)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 32-33 (Jan. 1991), p. 191-196 
    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.32-33.191.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Simulation and application of the distorted ZOLZ patterns from dislocations in Si (1990)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 46 (1990), S. 103-112 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The previously reported distorted zeroth-order fringes in a bright-field Tanaka pattern from a dislocated region in silicon have been computer simulated and the experimental and the many-beam calculated patterns agree well. Calculations are carried out for nine distinct cases of edge, screw and 60° dislocations in a silicon crystal. The general usefulness of the distortion of the ZOLZ pattern in determining geometrical properties of a dislocation is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767389010275
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