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  • ELECTRONICS AND ELECTRICAL ENGINEERING  (1)
  • Earth Resources and Remote Sensing  (1)
  • Femoral head  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Corticosteroid reduces blood flow to femoral heads in rabbits (1993)
    Springer
    Journal of biomedical science 1 (1993), S. 61-64 
    Details
    ISSN: 1423-0127
    Keywords: Avascular necrosis ; Femoral head ; Corticosteroid ; Laser Doppler velocimeter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Avascular necrosis of the femoral head is one of the common problems in orthopedic practice in Taiwan. The subchondral bone loses its blood supply which weakens its biomechanical support. Steroid overuse is one of many possible etiologies in reducing blood flow to the femoral head. Laser Doppler velocimeter is a precise monitor of regional blood flow of bone which is expressed in perfusion units (PU). In the control group the rabbits were injected with normal saline and there were no statistical differences between blood flow to the right hip (39.26±5.64 PU) and left hip (38.58±4.35 PU). In group B a weekly injection of methylprednisolone into rabbits for 6 weeks demonstrated the reduction of blood flow of femoral head (24.74±3.13 PU) by the laser Doppler velocimeter. The flow decreased further (15.93±2.33 PU) by 12 weeks of steroid treatment. In group C after a weekly injection of steroid for 6 weeks the flow became 31.63±4.79 PU. The steroid was then discontinued for 3 weeks and the flow was 34.6±1.34 PU. In group D the blood flow was 25.89±4.01 PU after 6 weeks of steroid treatment and we stopped the steroid for 6 weeks, the blood flow became 29.86±2.59 PU. The merit of our experiment established a model of study in avascular necrosis of the femoral head in rabbits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02258341
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    Paper (German National Licenses)
    Fulltext
  • 2
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    On 32-GHz cryogenically cooled HEMT low-noise amplifiers (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The cryogenic noise temperature performance of a two-stage and a three-stage 32 GHz High Electron Mobility Transistor (HEMT) amplifier was evaluated. The amplifiers employ 0.25 micrometer conventional AlGaAs/GaAs HEMT devices, hybrid matching input and output microstrip circuits, and a cryogenically stable dc biasing network. The noise temperature measurements were performed in the frequency range of 31 to 33 GHz over a physical temperature range of 300 K down to 12 K. Across the measurement band, the amplifiers displayed a broadband response, and the noise temperature was observed to decrease by a factor of 10 in cooling from 300 K to 15 K. The lowest noise temperature measured for the two-stage amplifier at 32 GHz was 35 K with an associated gain of 16.5 dB, while the three-stage amplifier measured 39 K with an associated gain of 26 dB. It was further observed that both amplifiers were insensitive to light.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: The Telecommunications and Data Acquisition Report; p 71-81
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Effects of Faraday Rotation on Microwave Remote Sensing From Space at L-Band (1997)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The effect of Faraday rotation on the remote sensing of soil moisture from space is investigated using the International Reference Ionosphere (IRI) to obtain electron density profiles and the International Geomagnetic Reference Field (IGRF) to model the magnetic field. With a judicious choice of satellite orbit (6 am, sunsynchronous) the errors caused by ignoring Faraday rotation are less than 1 K at incidence angles less than 40 degrees.
    Keywords: Earth Resources and Remote Sensing
    Type: IEEE-97CH36042 , LC-97-70575 , Laboratory for Hydrospheric Processes Research Publications; 229-230|Geoscience and Remote Sensing; Aug 03, 1997 - Aug 08, 1997; Singapore; Singapore
    Format: text
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    NASA TECHNICAL REPORTS
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