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  • 74.20.De  (2)
  • COMMUNICATIONS AND RADAR  (2)
  • 1990-1994  (4)
  • 1970-1974
  • 1950-1954
  • 1920-1924
  • 1
    ISSN: 1432-0630
    Keywords: 74.25.Fy ; 74.60.Ge ; 74.20.De
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract It was recently suggested that the out-of-plane resistive dissipation in the high-T c systems could be quantitatively described in terms of the extended Josephson coupling model that accounts for both effective thermal energy and unusual anisotropy. This model is further confirmed in the present work by scaling the c-axis resistive transition data for H‖c observed in single crystalline La1.86Sr0.14CuO4 onto a single curve, in which only parameters extracted from experiments are used. We also argue the difficulty of the other dissipation models as a dominating origin of the field-induced broadening of c-axis resistive transition for H‖c.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0630
    Keywords: 74.60.Ge ; 74.25.Fy ; 74.20.De
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The measurement of the c-axis resistivity of single crystalline La1.86Sr0.14CuO4 is performed at different constant temperatures as a function of magnetic field H and angle θ between H and the ab-plane. It is shown that the 2D- or 3D-scaling rule proposed for high-T c superconductors does not work well for the present system. Taking into account unusual vortex dynamics in the high-T c systems, an extension is made to the 3D-scaling rule developed on the basis of the effective-mass model. Based on this extended rule, it is shown that at each given temperature the observed resistivity as a function of H and θ could be consistently scaled onto the corresponding Lorentz-force-free magnetoresistivity curves directly measured in H‖I‖c.
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 2013-08-31
    Description: A decentralized autonomous control mechanism applied to the control of three dimensional manipulators and its robustness to partial damage was assessed by computer simulation. Decentralized control structures are believed to be quite robust to time delay between the operator and the target system. A 10-jointed manipulator based on our control mechanism was able to continue its positioning task in three-dimensional space without revision of the control program, even after some of its joints were damaged. These results suggest that this control mechanism can be effectively applied to space telerobots, which are associated with serious time delay between the operator and the target system, and which cannot be easily repaired after being partially damaged.
    Keywords: COMMUNICATIONS AND RADAR
    Type: JPL, Third International Symposium on Artificial Intelligence, Robotics, and Automation for Space 1994 191-195 (SEE N95-23672 07-63); JPL, Third Internati
    Format: application/pdf
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  • 4
    Publication Date: 2013-08-29
    Description: Communications Research Laboratory (CRL) has investigated an advanced millimeter (mm)-wave satellite communications system for personal use. Experiments in mm-wave personal satellite communication are to be conducted for 3 years using Japan's Engineering Test Satellite VI (ETS-VI). This paper describes an experimental mm-wave (43/38 GHz) personal satellite communication system, including an onboard transponder and an earth terminal. The on-board transponder is almost completed, and the ground experiment system is still in the design stage. The transponder employs advanced mm-wave solid state technology. It uses 38 GHz high power solid state amplifiers to accelerate the development of mm-wave solid state devices which are indispensable to personal earth terminals. The transponder consists of a 43 GHz receiver with a built-in low noise amplifier, an IF filter section with very narrow bandwidth to improve the carrier-to-noise power ratio of the weak personal communication signal, and two high power amplifiers using newly developed high power Gallium Arsenide (GaAs) metal-semiconductor field effect transistors (MESFETs).
    Keywords: COMMUNICATIONS AND RADAR
    Type: JPL, Proceedings of the Workshop on Advanced Network and Technology Concepts for Mobile, Micro, and Personal Communications; p 55-64
    Format: text
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