Results 221 to 230 of about 236,890 (260)
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Conversion gain for interference combating
MILCOM 2015 - 2015 IEEE Military Communications Conference, 2015This paper is written to treat interference combating techniques in a general way to clear terms, present applications and emphasize that combining cooperative and non-cooperative techniques to improve system-performance. The investigations are done under the restriction to minimize resources and to keep the system-complexity low to enhance the ...
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Maternal gestational weight gain during pregnancy: prioritising the conversation
Australian Journal of Primary Health, 2017Pregnancy is a critical stage of life requiring urgent attention when taking a lifespan approach to obesity prevention. Excessive gestational weight gain (GWG) is highly predictive of overweight and obesity later in life for women and their offspring.
Walker, Ruth +4 more
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Vibrating Membrane Electrometer with High Conversion Gain
Review of Scientific Instruments, 1964A vibrating membrane transducer is used as the sensing element for a high sensitivity electrometer. The method of operation provides an increased conversion gain by using a special circuit in which the electrometer current controls the displacement amplitude of a membrane forced to vibrate at its resonant frequency. The experimental transducer produces
John Dimeff, James W. Lane
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High conversion gain receiver for wireless sensor network
2016 2nd International Conference on Intelligent Green Building and Smart Grid (IGBSG), 2016This work demonstrates a fully integrated 24 GHz CMOS receiver for high gain and wireless sensor network. The receiver incorporates a low noise amplifier, double-balanced mixer and an active balun for single to differential. This mixer designs with active load to decrease power dissipation.
Heng-Ming Hsu, Wei-En Chang
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Negative resistance and conversion gain in SIS mixers
Physica B+C, 1981Abstract We report the observation of negative quasiparticle dynamic resistance on the DC I–V curves of superconductor-insulator-superconductor tunnel junctions. This negative resistance appears on the first few photon assisted tunneling steps below 2Δ/e when our tin-tin oxide-tin tunnel junctions are pumped with a 36 GHz microwave current source. We
A.D. Smith +5 more
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Conversion gain in mm-wave quasiparticle heterodyne mixers
Applied Physics Letters, 1980We report the observation of heterodyne mixing in superconductor-insulator-superconductor tunnel junctions with significant conversion gain and with a noise temperature comparable to the photon noise limit. (Double sideband L−1=1.400.14, TM≲1.5 K at 36 GHz.) The mixing arises from the strong nonlinearity in the quasiparticle tunneling currents at ...
T.-M. Shen +3 more
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Millimeter‐wave down‐converter conversion gain performance enhancement
Microwave and Optical Technology Letters, 2002AbstractThe influence of via hole inductance on millimeter‐wave single‐ended pHEMT gate‐mixer down‐converter conversion gain is examined by a closed formula and by measurement. It is shown that feedback inductance acts as a voltage divider, reducing the conversion gain and increasing the LO power requirements. Analytical considerations presented in the
Brabetz, T., Fusco, V. F.
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Conversion matrix and gain of self-oscillating mixers
IEEE Transactions on Microwave Theory and Techniques, 1991The conversion matrix of self-oscillating mixers is derived from the bias-, amplitude-, and frequency-dependent admittance of the active device together with its dynamic current-voltage characteristic. Components at the image frequency are also taken into account.
M. Claassen, U. Guttich
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Gain enhancement of multistage parametric intracavity frequency conversion
IEEE Journal of Quantum Electronics, 1997Multistage intracavity frequency conversion in optical parametric oscillators (OPOs) can generate new frequencies efficiently over a large dynamic range of pump intensity. These frequencies can be either higher or lower than the pump frequency. High efficiency is correlated with steady states exhibiting nearly complete pump depletion (CPD).
G.T. Moore, K. Koch, M.E. Dearborn
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Medical Physics, 2002
Fluoroscopy is a low dose imaging technique. As such, a very sensitive detector is required to create images of good quality. Present day flat panel active matrix read out systems introduce an amount of noise that inhibits present direct and indirect methods from producing optimal quality images at fluoroscopic exposure rates (0.1–10 μR per frame). The
Dylan C, Hunt +2 more
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Fluoroscopy is a low dose imaging technique. As such, a very sensitive detector is required to create images of good quality. Present day flat panel active matrix read out systems introduce an amount of noise that inhibits present direct and indirect methods from producing optimal quality images at fluoroscopic exposure rates (0.1–10 μR per frame). The
Dylan C, Hunt +2 more
openaire +2 more sources