Results 31 to 40 of about 2,213,154 (301)

Experimental Study of Electrical Properties of Pharmaceutical Materials by Electrical Impedance Spectroscopy

open access: yesApplied Sciences, 2020
The physicochemical characterization of pharmaceutical materials is essential for drug discovery, development and evaluation, and for understanding and predicting their interaction with physiological systems.
Manuel Vázquez-Nambo   +6 more
doaj   +1 more source

Response Analysis and Controlling the Nonlinear Vibration of Van Der-Pol Duffing Oscillator Connected to the NIPPF Controller

open access: yesIEEE Access, 2021
In this paper, we introduced response analysis and controlling the nonlinear vibration of van der pol duffing oscillator subject to parametric and external excitations by connecting the nonlinear integral positive position feedback (NIPPF).
Khadijah M. Abualnaja   +4 more
doaj   +1 more source

A Polynomial-Exponent Model for Calibrating the Frequency Response of Photoluminescence-Based Sensors

open access: yesSensors, 2020
In this work, we propose a new model describing the relationship between the analyte concentration and the instrument response in photoluminescence sensors excited with modulated light sources. The concentration is modeled as a polynomial function of the
Angel de la Torre   +3 more
doaj   +1 more source

Experimental Study on the Effect of Attachments on the Vortex-Induced Vibration of a Centrally Slotted Box Deck [PDF]

open access: yesJournal of Applied Fluid Mechanics, 2023
Centrally slotted box decks have been commonly used as components of bridges, especially for long-span bridges. A wind tunnel experiment was conducted to investigate the effect of attachments on the vortex-induced vibration (VIV) of the deck.
D. Xia, L. Dai, L. Lin
doaj   +1 more source

Analytic Matrix Method for Frequency Response Techniques Applied to Nonlinear Dynamical Systems I: Small and Medium Amplitude Oscillations

open access: yesMathematics, 2021
This is the first on a series of articles that deal with nonlinear dynamical systems under oscillatory input that may exhibit harmonic and non-harmonic frequencies and possibly complex behavior in the form of chaos.
Elena Hernandez   +3 more
doaj   +1 more source

Camera Spatial Frequency Response Derived from Pictorial Natural Scenes [PDF]

open access: yes, 2022
Camera system performance is a prominent part of many aspects of imaging science and computer vision. There are many aspects to camera performance that determines how accurately the image represents the scene, including measurements of colour accuracy ...
Van Zwanenberg, O.
core   +1 more source

Power Reserve from Photovoltaics for Improving Frequency Response in the Isolated System

open access: yesEnergies, 2023
Appropriate frequency response is an issue of great importance in power system management, especially in an islanded one. An energy-based method for assessing a system’s response, which is needed to prevent under frequency load shedding (UFLS), is ...
Olga Poliak, Doron Shmilovitz
doaj   +1 more source

The phase response of primary auditory afferents in a songbird (Sturnus vulgaris L.) [PDF]

open access: yes, 1988
The effects of stimulus frequency and intensity on phase-locking characteristics of cochlear ganglion cells were studied in the starling. All cells showed phase-locking to tone stimuli within their response area. Phase-locking at CF is found on average 9
Gleich, Otto, Narins, P. M.
core   +1 more source

Dynamic Inertia Response Support by Energy Storage System with Renewable Energy Integration Substation

open access: yesJournal of Modern Power Systems and Clean Energy, 2020
In recent years, the expansion of renewable energy in electric power systems has been increasing at such a rapid pace that it has started affecting frequency stability.
Yeuntae Yoo, Seungmin Jung, Gilsoo Jang
doaj   +1 more source

A Method for Assessing the Stability of Digital Automatic Control Systems (ACS) with Discrete Elements. Hypothesis and Simulation Results

open access: yesEnergies, 2021
The article presents a new approach to the analysis of the stability of automatic systems with discrete links. In almost all modern automatic control systems (ACS), there are links that break signals in time.
Vladimir Kodkin   +2 more
doaj   +1 more source

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