Results 291 to 300 of about 9,973,806 (349)
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Stability in phonational frequency range
Journal of Communication Disorders, 1989The purpose of the present study was to investigate the stability of total phonational frequency range, and the stability of the elements from which it is calculated--lowest fundamental frequency and highest fundamental frequency--both within a single day and over a prolonged period.
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Angle, Voltage, and Frequency Stability
2008info:eu-repo/semantics ...
Cañizares, Claudio +2 more
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Variable-Frequency Bridge-Type Frequency-Stabilized Oscillators
Proceedings of the IRE, 1943Results are given of a theoretical and experimental investigation into two types of bridge-stabilized oscillators incorporating a thermal device for amplitude control. One circuit employs only resistances and capacitances in the frequency-determining network and consequently is useful for low-frequency operation.
W.G. Shepherd, R.O. Wise
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Oscillator Frequency Stability
1978The term frequency stability is a generic term which means a variety of things to different people depending on their individual interests. In its broadest concept, it means the degree of constancy of the frequency of an oscillator under a particular set of conditions.
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Characterization of frequency stability: frequency-domain estimation of stability measures
Proceedings of the IEEE, 1991The author focuses on the frequency domain approach, which provides a complete characterization of frequency. The standard characterization of frequency stability in the frequency domain is the spectral density function (SDF). The author describes SDFs that model sampled frequency stability data and that are related to the SDFs of the standard ...
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Frequency dependence and stability
Mathematical Biosciences, 1976Abstract The use of difference equations is suggested for simulating frequency-dependent changes in gene frequencies. Our model shows a good fit to published cases of populations in which gene frequencies reached stable equilibrium. However, in the same deterministic model, slight changes in the value of some parameters can lead to cyclic or chaotic ...
Raveh, Adi, Ritte, Uzi
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IEEE Transactions on Smart Grid, 2019
This paper develops a controlled network partitioning model to improve power grid resilience under catastrophic events. The proposed remedial scheme relies on a mixed integer linear programming formulation which aims at minimizing the overall load ...
Farhad Teymouri +3 more
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This paper develops a controlled network partitioning model to improve power grid resilience under catastrophic events. The proposed remedial scheme relies on a mixed integer linear programming formulation which aims at minimizing the overall load ...
Farhad Teymouri +3 more
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Frequency stability improvement in wind‐thermal dominated power grids
IET Generation, Transmission & Distribution, 2019With the proliferation of intermittent renewable energy sources, power systems need to withstand an increasing number of disturbances that may affect system frequency.
Alireza Ashouri‐Zadeh +3 more
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Different Influence of Grid Impedance on Low- and High-Frequency Stability of PV Generators
IEEE transactions on industrial electronics (1982. Print), 2019Recently, the stability issues when renewable energy sources are connected to the weak grid have obtained great attention. The popular view thinks that the grid impedance is adverse to the system stability.
Yang-hong Xia +4 more
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Optogalvanic Laser Frequency Stabilization
1986The CO2 laser radiation field intensity is large enough and when is varied it introduces significant changes in the laser plasma microscopic parameters such as discharge sidelight intensity, plasma impedance and gas temperature. From among these parameters, a distinct interest is given to plasma impedance, because it is possible to establish a direct ...
D. C. Dumitras +3 more
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