Search Results - "critical frequency"
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Determination of Gyro Frequency from Critical Frequency Measurements Over Parit Raja, Malaysia
Published 2013“…The critical frequencies of the ionosphere are observed from ionograms to determine the gyro frequencies. …”
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Observations of f-region critical frequency variation over Batu Pahat, Malaysia during low solar activity
Published 2011“…Wireless radio in the HF band still uses the ionospheric layer as the main medium for communication. Critical frequencies are important parameters of the ionosphere. …”
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Kajian awal variabiliti ionosfera di Parit Raja, Batu Pahat pada bulan September 2004
Published 2004“…The result base on the ordinary wave critical frequency for stratification in the F region, foF2, the virtual height for ordinary wave critical frequency or foF2, and the ordinary wave critical frequency from the lowest thick layer of E region. …”
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An optimal full frequency control strategy for the modular multilevel matrix converter based on predictive control
Published 2017“…For operation at critical-frequency points, there is no increase on branch voltage stresses and limited increase on branch current stresses. …”
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Microwave technique for moisture content and pH determination during pre-harvest of mango cv. Chok Anan
Published 2018“…The effects of frequency and m.c. on the values of the dielectric constant and loss factor were also investigated. The critical frequency separating the different polarizations was found to be inversely proportional to m.c. …”
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Microwave technique for moisture content and pH determination during pre- harvest of mango cv. Chok Anan
Published 2018“…The effects of frequency and m.c. on the values of the dielectric constant and loss factor were also investigated. The critical frequency separating the different polarizations was found to be inversely proportional to m.c. …”
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Forecasting the ionospheric
Published 2022“…One of the most important ionospheric parameters is the critical frequency of the ionospheric…”
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Convex combination framework for a priori SNR estimation in speech enhancement
Published 2017“…The paper proposes a convex combination fusion function based on a sigmoid function for the estimation of the a priori SNR in a speech enhancement framework with critical frequency band processing. The proposed method does not only eliminate the one frame delay generated by the well-known decision directed approach but also increases the adaptation speed during abrupt changes in the SNR estimation. …”
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Short-term statistical analysis of the occurrence of the f3 layer in Malaysian ionosphere for winter 2004
Published 2005“…A Vertical Digital Sounder is used to measure and to determine the critical frequency, virtual height, MUF and electron density at any given time. …”
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Short-term statistical analysis of the occurrence of the F3 layer in Malaysian ionosphere for winter 2004
Published 2005“…A Vertical Digital Sounder is used to measure and to determine the critical frequency, virtual height, MUF and electron density at any given time. …”
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Classical solutions of yang-mills-chern-simons theory in 2+1 dimensions : a quasi-linear superposition / Rosy Teh
Published 1994“…We pointed out that there exists a critical frequency of oscillation for the vortex-like solution (Teh 1990a) above which the system switches to the fields of an alternating current inside a solenoid. …”
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Illusory motion reversals and feature tracking analyses of movement
Published 2014“…Consistent with this proposal, we show that the critical frequency for inducing IMRs is dictated by the duty cycle of salient features within a moving pattern, rather than by the temporal frequency of luminance changes. © 2014 American Psychological Association.…”
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Thermal diffusivity measurement for p-Si and Ag/p-Si by photoacoustic technique
Published 2015“…For the single layer samples, the thermal diffusivity can be obtained by fitting as well as by obtaining the critical frequency f c . In this study, the thermal diffusivity of the p-Si samples increased with increasing the annealing temperature. …”
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Modelling of ionosphere behaviour prior to large earthquakes
Published 2017“…This project examines the behavior of pre-earthquake ionospheric parameters by the variation in foF2 (critical frequency of F2 layer) and TEC (total electron content) from the ionosondes stations. …”
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Dielectric based measurement system for the determination of watermelon internal quality
Published 2018“…The turning, known as critical frequency separates the bound and free water molecules. …”
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Large-eddy simulation of gas–liquid two-phase flow in a bubble column reactor using a modified sub-grid scale model with the consideration of bubble-eddy interaction
Published 2020“…The power turbulent kinetic energy spectrum obtained in LES indicates that a slope similar to Komogorov -5/3 scaling law and the -3 scaling law can still be identified for a critical frequency f=10.70 Hz. © 2020 The Author(s)…”
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Vibration energy transmission in coupled systems with local nonlinearities
Published 2020“…For the bilinear stiffness interface, a larger bilinear frequency ratio shifts the secondary resonances and critical frequency of the equilibrium point of power transmission to higher frequencies. …”
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Frequency control scheme for islanded distribution network with high PV penetration / Mohammad Hussein Mohammad Dreidy
Published 2017“…However, at high PV penetration levels, an islanded distribution network suffers from critical frequency stability issues. This occurs due to two main reasons: first, the reduction of the distribution network inertia with high PV penetration, where in this condition, the rate of change of frequency (ROCOF) will be high enough to activate the load shedding controller, even for small power disturbance, and second, this type of networks has a small spinning reserve, where the PV generations are normally providing the maximum output power. …”
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Numerical methods in non-perturbative quantum field theory
Published 2017“…This markedly contrasts the classical evolution where the oscillon frequency has been demonstrated to evolve to a critical frequency when the structure abruptly collapses. …”
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Characteristics of sound propagation in shallow water over an elastic seabed with a thin cap-rock layer
Published 2013“…A theoretical analysis and numerical modeling show that, in such environments, low attenuation of underwater sound is expected only in narrow frequency bands just above the modal critical frequencies which in turn are governed primarily by the water depth and compressional wave speed in the seabed. …”
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