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Letteratura scientifica selezionata sul tema "Steady State Frequency"

Autore: Grafiati

Pubblicato: 5 ottobre 2024

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Articoli di riviste sul tema "Steady State Frequency"

Mackay, Mark A., e Tony C. Badrick. "Steady state errors and QC frequency". Pathology 51 (febbraio 2019): S107. http://dx.doi.org/10.1016/j.pathol.2018.12.298.

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Mohaddes, M., A. M. Gole e S. Elez. "Steady state frequency response of STATCOM". IEEE Transactions on Power Delivery 16, n. 1 (2001): 18–23. http://dx.doi.org/10.1109/61.905574.

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Picton, Terence W., Andrew Dimitrijevic e M. Sasha John. "Multiple Auditory Steady-State Responses". Annals of Otology, Rhinology & Laryngology 111, n. 5_suppl (maggio 2002): 16–21. http://dx.doi.org/10.1177/00034894021110s504.

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Abstract (sommario):

Steady-state responses are evoked potentials that maintain a stable frequency content over time. In the frequency domain, responses to rapidly presented stimuli show a spectrum with peaks at the rate of stimulation and its harmonics. Auditory steady-state responses can be reliably evoked by tones that have been amplitude-modulated at rates between 75 and 110 Hz. These responses show great promise for objective audiometry, because they can be readily recorded in infants and are unaffected by sleep. Responses to multiple tones presented simultaneously can be independently assessed if each tone is modulated at a different modulation frequency. This ability makes it possible to estimate thresholds at several audiometric frequencies in both ears at the same time. Because amplitude-modulated tones are not significantly distorted by free-field speakers or microphones, they can also be used to evaluate the performance of hearing aids. Responses to amplitude and frequency modulation may also become helpful in assessing suprathreshold auditory processes, such as those necessary for speech perception.

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Sule, V. R. "Steady-state frequency response for periodic systems". Journal of the Franklin Institute 338, n. 1 (gennaio 2001): 1–20. http://dx.doi.org/10.1016/s0016-0032(00)00067-3.

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Lins, Otavio G., Terence W. Picton, Brigitte L. Boucher, Andreé Durieux-Smith, Sandra C. Champagne, Linda M. Moran, Maria C. Perez-Abalo, Vivian Martin e Guillermo Savio. "Frequency-Specific Audiometry Using Steady-State Responses". Ear and Hearing 17, n. 2 (aprile 1996): 81–96. http://dx.doi.org/10.1097/00003446-199604000-00001.

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Foxall, D. L. "Frequency-modulated steady-state free precession imaging". Magnetic Resonance in Medicine 48, n. 3 (23 agosto 2002): 502–8. http://dx.doi.org/10.1002/mrm.10225.

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Telang, N. P., e L. R. Hunt. "Frequency domain computations for nonlinear steady-state solutions". IEEE Transactions on Signal Processing 49, n. 8 (2001): 1728–33. http://dx.doi.org/10.1109/78.934143.

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NAKHMANSON, R. S. "High- and low-frequency steady-state MIS photovoltage". International Journal of Electronics 59, n. 6 (dicembre 1985): 685–99. http://dx.doi.org/10.1080/00207218508920746.

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Labecki, Maciej, Maria Malgorzata Nowicka e Piotr Suffczynski. "Temporal Modulation of Steady-State Visual Evoked Potentials". International Journal of Neural Systems 29, n. 03 (18 marzo 2019): 1850050. http://dx.doi.org/10.1142/s0129065718500508.

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Electroencephalographic responses to periodic stimulation are termed steady-state visual evoked potentials (SSVEP). Their characteristics in terms of amplitude, frequency and phase are commonly assumed to be stationary. In this work, we tested this assumption in 30 healthy participants submitted to 50 trials of 60[Formula: see text]s flicker stimulation at 15[Formula: see text]Hz frequency. We showed that the amplitude of the first and second harmonic frequency components of SSVEP signals were in general not stable over time. The power (squared amplitude) of the fundamental component was stationary only in 30% the subjects, while the power at the second harmonic frequency was stationary in 66.7% of the group. The phases of both SSVEP frequency components were more stable over time, but could exhibit small drifts. The observed temporal changes were heterogeneous across the subjects, implying that averaging results over participants should be performed carefully. These results may contribute to improved design and analysis of experiments employing prolonged visual stimulation. Our findings offer a novel characterization of the temporal changes of SSVEP that may help to identify their physiological basis.

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Chen, Ying, e Xiang Jie Chen. "Analysis for TCSC Steady-State Characteristics". Advanced Materials Research 179-180 (gennaio 2011): 1435–40. http://dx.doi.org/10.4028/www.scientific.net/amr.179-180.1435.

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When the TCSC steady-state operation, the thyristor turn-on and turn-off time is definite, the changing for TCSC electric capacity voltage and thyristor electric current is with the periodicity and symmetry.Thyristor controlled series compensation technology is fixed series compensation technology foundation, which is meet the needs for adaptation electrical power system operation control developing. With changes the triggering angle for thyristor suitably, then can realize the TCSC equivalent reactance fast, continuously and adjusts smoothly, provides the controllable series compensation for the system, as to achieve increases the system transmitting capacity, enhance the transition condition stability, the damping power oscillation, and the purpose for improvement system tidal current distribution. Although in the entire time axis, obtains the analytic expression for TCSC running status variable is difficulty, but as long as had determined the analytic expression for various electrical quantity in a power frequency cycle, according to the stable state movement's symmetry and periodicity, we can determine the steady state profile that in the entire time axis, and then analyses the TCSC electric circuit’s steady-state characteristic with the time domain computation method. In this paper, topological analysis for TCSC operation established by formula, and then carries on the time domain partition to the TCSC electric circuit solution, finally obtains the steady state fundamental frequency impedance model for TCSC. This paper steady-state characteristic analysis is mainly carries on the topological analysis method to the TCSC main circuit, then establishes the stable state base frequency impedance model for TCSC, and analyses the resonance question for TCSC simultaneously. Then studies TCSC the steady- state characteristic, and with modeling and simulation on them to do further research and analysis, and utilizes the solution method for transformation territory, namely applies the Laplace transform solution equation of state. Thus can be obtained the zero-input response and zero status response formula for system.

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Tesi sul tema "Steady State Frequency"

Lee, Chong Kyong 1973. "Continuation methods for steady state analysis of oscillators". Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99777.

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Oscillator circuits are an integral component of wireless communications systems and are increasingly in demand. As such systems gain widespread use, price becomes a very important factor in the design process, and the design cycle must be optimized. This puts an increasing emphasis on the proficiency of oscillator design automation tools. At the same time, as the performance requirements of such systems are becoming more stringent, the required simulation complexity is also increasing. More specifically, high frequency selectivity and low phase noise require very high quality factor oscillators, which in turn negatively affect the convergence performance of current simulation techniques. This thesis proposes a new continuation method for improving the convergence of oscillator simulations and compares this method to some of the methods reported in the literature. The proposed approach does not require a very good initial guess in order to converge to a final solution.

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Unosson, Måns. "A Mixed Frequency Steady-State Bayesian Vector Autoregression: Forecasting the Macroeconomy". Thesis, Uppsala universitet, Statistiska institutionen, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-297406.

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This thesis suggests a Bayesian vector autoregressive (VAR) model which allows for explicit parametrization of the unconditional mean for data measured at different frequencies, without the need to aggregate data to the lowest common frequency. Using a normal prior for the steady-state and a normal-inverse Wishart prior for the dynamics and error covariance, a Gibbs sampler is proposed to sample the posterior distribution. A forecast study is performed using monthly and quarterly data for the US macroeconomy between 1964 and 2008. The proposed model is compared to a steady-state Bayesian VAR model estimated on data aggregated to quarterly frequency and a quarterly least squares VAR with standard parametrization. Forecasts are evaluated using root mean squared errors and the log-determinant of the forecast error covariance matrix. The results indicate that the inclusion of monthly data improves the accuracy of quarterly forecasts of monthly variables for horizons up to a year. For quarterly variables the one and two quarter forecasts are improved when using monthly data.

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Arjona, Lopez Marco Antonio. "Steady state and frequency domain lumped model numerical characterisation of solid rotor synchronous generators". Thesis, Imperial College London, 1996. http://hdl.handle.net/10044/1/7548.

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Cheng, Jung-hui 1960. "Steady-state and dynamic analysis of high-order resonant converters for high-frequency applications". Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/282337.

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Practical steady-state and dynamic design and analysis for high-order dc/dc resonant converters is presented. The analysis is mainly based on two types of the resonant converters, parallel-type and Class-D (a series-type), which are suitable for high-frequency applications. In the analysis of parallel resonant converters, the key step in the derivation of steady-state analytic equations for LLC-type parallel (LLC-PRC) and LLCC-type series-parallel resonant converter (LLCC-SPRC) is to reduce the order of their state-space models. In particular, the analytic equations for LLCC-SPRC can also be used to design and analyze the LC-PRC, LLC-PRC, and LCC-type series-parallel resonant converters. A simple design procedure along with design examples is given based on the derived analytic equations. Experimental LLC-PRC and LLCC-SPRC are implemented to verify the design results. In the analysis of the zero-voltage switch (ZVS) Class-D converter, both steady-state and dynamic analysis methods are presented. The analysis is based on the Class-D converter with a variable capacitance switch (VCS) for voltage regulation at constant frequency. A generalized DC model for steady-state and dynamic analysis of the converter is given. A simplified small-signal model is found from perturbing the DC model and can be used to predict the low-frequency dynamic control- and line-to-output transfer functions. To predict the high-frequency dynamics, two models are derived based on the amplitude and phase modulations from communication theory. Besides the steady-state and small-signal modeling, a strategy to achieve a stable loop gain for closed-loop operation is addressed. A compensation controller for closed-loop operation of the VCS is developed. All the calculated and design results of the dynamic responses are verified based on the experimental measurements from the prototype converter.

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Brennan, SiobhaÌn Katharine. "Effect of varying the amplitude and frequency modulation phase relationship on steady state evoked potentials". Thesis, University of Sheffield, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398681.

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Ballukja, Erjon. "Power Quality Analysis in DC/DC Converters under Steady State and Transient Conditions". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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Abstract (sommario):

The modern electric power systems are going through significant changes because of continuous increasing demand of electric power. Further, a growing number of renewable energy systems that directly deliver DC power jointly considered with the advance in DC technology allows a more efficient and affordable use of energy. Furthermore, a rising use of DC systems and microgrids in a wide number of applications has motivated the study of Power Quality (PQ). The concept of power quality in DC systems and microgrids brings many challenges and the aim of this thesis is to understand the delivered power quality in DC microgrid systems. In this thesis, the effects of low frequency range (0-2 kHz) conducted emissions on power quality from a microgrid based DC/DC converter under steady state and transient loading conditions represent the main purpose of this work. Indeed, for a DC distribution network there is a lack of standards and guidelines concerning power quality issues and acceptable levels of conducted disturbances in the aforementioned frequency range. Consequently, the objective of this thesis is to quantify adequate power quality indices for DC systems or networks with connected loads such as Low Frequency Sinusoidal Disturbance (% LFSD) and Amplitude Probability Distribution (APD) indices.

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Schenk, Eric R. "Detection of specific steady-state visual evoked potentials when multiple frequencies are available for simulation". Ohio University / OhioLINK, 1998. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1176401258.

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Slawig, Anne [Verfasser], e Herbert [Gutachter] Köstler. "Reconstruction methods for the frequency-modulated balanced steady-state free precession MRI-sequence / Anne Slawig ; Gutachter: Herbert Köstler". Würzburg : Universität Würzburg, 2018. http://d-nb.info/1161344284/34.

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Markessis, Emily. "Development of an objective procedure allowing frequency selectivity measurements using the masking function of auditory steady state evoked potentials". Doctoral thesis, Universite Libre de Bruxelles, 2010. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209990.

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Introduction

Les surdités cochléaires induisent, outre une audibilité réduite, une série de distorsions de la représentation neurale des sons. Deux des mécanismes à la base de ces distorsions sont d’une part une atteinte de la sélectivité fréquentielle et d’autre part des zones neuro-épithéliales non fonctionnelles. Tant le premier que le second mécanisme apparaissent dans une proportion variable et non prédictible d’un sujet à un autre. Deux tests permettent le diagnostic de ces atteintes spécifiques: la Courbe d’Accord (Tuning Curve: TC) et le Threshold Equalising Noise (TEN) test. La TC, mesurée par une technique psychoacoustique chez un adulte collaborant (Psychophysical TC: PTC), consiste en la mesure du niveau de bruit (masqueur) nécessaire pour masquer un son pur (signal) de fréquence et d’intensité fixes. Le TEN test consiste en la mesure des seuils auditifs dans le silence et en présence d’un bruit égalisateur de seuil (TEN). Ces tests qui requièrent des capacités cognitives adultes normales, ne sont pas applicables aux populations pédiatriques prélinguales.

Ce travail de thèse avait pour but le développement d’un équivalent objectif et non invasif des TCs et du TEN test applicable aux populations pédiatriques. La méthode objective choisie fut les potentiels auditifs stationnaires ou ASSEPs (Auditory Steady State Evoked Potentials). Les ASSEPs sont une réponse électrophysiologique cérébrale évoquée par un stimulus acoustique de longue durée modulé en amplitude et/ou en fréquence.

Méthodes & Résultats

Etape 1

Les développements méthodologiques ont été réalisés sur l’espèce canine et humaine adulte. Les ASSEPs n’ayant jamais été préalablement enregistrés chez le chien, une première étape à consister à définir chez cette espèce les paramètres d’enregistrement optimaux (modulation en amplitude optimale) dont on sait qu’ils interagissent avec l’état veille-sommeil, avec la fréquence testée et probablement avec l’espèce animale investiguée.

A cette fin, les seuils auditifs obtenus chez 32 chiens à l’aide des ASSEPs ont été validés à cinq fréquences audiométriques par comparaison aux seuils obtenus avec les potentiels auditifs du tronc cérébral évoqués aux bouffées tonales.

Les seuils obtenus aux ASSEPs avec les paramètres optimaux d’enregistrement (légèrement différents des paramètres optimaux humains) étaient similaires à ceux obtenus aux bouffées tonales.

Ces résultats ont été publiés dans Clinical Neurophysiology (Markessis et al. 2006; 117: 1760-1771).

Etape 2

La possibilité de mesurer des TCs à l’aide des ASSEPs (ASSEP-TCs) a été évaluée sur 10 chiens. Les données canines ont été comparées à des données de la littérature, çàd aux TC enregistrées chez d’autres espèces et avec d’autres méthodes. Des ASSEP-TCs ont également été enregistrées chez 7 humains adultes et confrontées aux PTCs obtenues chez les mêmes sujets. Les PTCs sont typiquement energistrées avec un signal sinusoïdal alors que le stimulus utilisé pour évoquer un ASSEP est une sinusoïde modulée en amplitude. L’effet des sinusoïdes modulées en amplitude sur les paramètres qualitatifs et quantitatifs des TCs a donc été évalué en comparant les PTCs obtenues avec un son pur et avec un son pur modulé en amplitude chez 10 humains adultes.

Les résultats ont révélé que les ASSEP-TCs enregistrées chez le chien et l’humain présentaient des paramètres qualitatifs et quantitatifs similaires respectivement à ceux décrits dans la littérature et aux PTCs. Par ailleurs, auncun effet des stimuli modulés en amplitude sur les paramètres des PTCs n’a été démontré.

Ces données ont été publiées dans Ear & Hearing (Markessis et al. 2009, 30: 43-53).

Etape 3

Les ASSEP-TCs ont été validées chez 10 chiens en comparant les données aux TC enregistrées par électrocochléographie (Compound Action Potential TC: CAP-TC). Le masqueur utilisé pour les CAP-TCs est typiquement une sinusoïde alors que le masqueur utilisé pour les ASSEP-TCs est un bruit à bande étroite. Dès lors, une comparaison du type de masqueur (sinusoïde vs bruit à bande étroite) sur les paramètres des CAP-TCs et ASSEP-TCs a été réalisée chez 10 chiens.

Les ASSEP-TCs chez le chien se sont révélées qualitativement et quantitativement similaires aux CAP-TCs quel que soit le type de masqueur. Elles presentaient par ailleurs l’avantage d’être moins variables, plus précises et non invasives par rapport aux CAP-TCs.

Ces données ont été publiées dans International Journal of Audiology (Markessis et al. 2010, 49 ;455-62).

Etape 4

Afin d’étudier la validité de la procédure à mettre en évidence des changements de sélectivité fréquentielle dus à une atteinte cochléaire, des ASSEP-TCs ont été obtenues chez 10 chiens cochléo-lésés suite à un trauma acoustique. Les Produits de Distorsion Acoustiques, les potentiels évoqués auditifs du tronc cérébral évoqués par un clic et les ASSEPs à cinq fréquences audiométriques ont été enregisrés afin de délimiter l’étendue de la lésion.

Les ASSEP-TCs ont été fortement altérées, mais pas comme attendu ni suggéré par les mesures fonctionnelles indiquant que le trauma acoustique a créé une lésion différente de celle espérée.

Cette étude doit être poursuivie, des lésions moins importantes créées et une validation histopathologique réalisée.

Etape 5

Le TEN test a été mesuré à l’aide des ASSEPs (ASSEP-TEN) chez 12 adultes et cinq enfants normo-entendants. Les données adultes ont été confrontées aux données comportementales. L’effet des stimuli ASSEP (son pur modulé en amplitude) sur les TEN test a également été investigué en comparant les données comportementales obtenues avec une sinusoïde et avec une sinusoïde modulée en amplitude chez 24 adultes.

Les seuils masqués enregistrés aux ASSEPs étaient supérieurs à ceux mesurés par une épreuve comportementale. L’élévation des seuils masqués pose un problème potentiel de dynamique.

La procédure doit être testée chez des patients présentant une surdité cochléaire attendu que la différence entre les seuils auditifs mesurés aux ASSEPs et par une épreuve comportementale est moindre dans cette population. Dans la mesure où le problème de dynamique résiduelle persiste chez les patients malentendants, d’autres stimuli ou algorithmes d’enregistrement doivent être utilisés.

Etape 6

Le TEN est un stimulus large bande. Il peut dès lors se révéler intolérable chez des patients présentant une atteinte auditive restreinte à une region fréquentielle. L’effet du filtrage du TEN sur les seuils et la sonie du TEN a été étudié chez 24 sujets normo-entendants et 35 patients présentant une perte cochléaire dans les hautes fréquences.

Le filtrage passe-haut du TEN s’est avéré être une solution satisfaisante.

Ces données ont été publiées dans International Journal of Audiology (Markessis et al. 2006; 45: 91-98).

Etape 7

L’effet de l’intensité du TEN sur le diagnostic des zones neuro-épithéliales non fonctionnelles a été investigué chez 24 patients en mesurant les seuils masqués à quatre intensités de TEN différentes. La fiabilité du TEN test a également été évaluée.

Le TEN est une procédure fiable. L’intensité du TEN a affecté le diagnostic chez cinq patients. Ce résultat est interprété en termes de degré de l’atteinte du complexe neurosensoriel.

Ces données ont été publiées dans International Journal of Audiology (Markessis et al. 2009; 48: 55-62).

Conclusion

Un algorithme permettant la mesure de TC et du TEN test objective à l’aide des ASSEPs a été développé. L’implémentation clinique de l’algorithme appliqué à l’enregistrement des CA paraît envisageable. Une importante étape de la corrélation entre modifications anatomiques (à l’aide de l’histopathologie) et physiologiques (ASSEP-TC et CAP-TC) est maintenant celle qui s’impose. Les données préliminaires obtenues sur le TEN test électrophysiologique chez des sujets normo-entendants suggèrent que son implémentation clinique puisse se heurter à un problème de dynamique si ce dernier est confirmé en présence de surdités cochléaires. Plusieurs pistes potentielles de solutions ont été avancées.

Doctorat en Sciences biomédicales et pharmaceutiques
info:eu-repo/semantics/nonPublished

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Smith, Norman Alan. "The steady-state and post-ignition transient luminous behaviour of the tubular fluorescent lamp operating throughout the dimmed mode range using high frequency dimming". Thesis, University of Sheffield, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387764.

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Libri sul tema "Steady State Frequency"

Kanazawa, Satoshi, e Norman P. Li. The Savanna Theory of Happiness. A cura di Rosemary L. Hopcroft. Oxford University Press, 2018. http://dx.doi.org/10.1093/oxfordhb/9780190299323.013.48.

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This chapter describes the savanna theory of happiness, which posits that it may not be only the consequences of a given situation in the current environment that affect individuals’ happiness but also what its consequences would have been in the ancestral environment. The theory further suggests that the effect of such ancestral consequences on happiness is stronger among less intelligent individuals than among more intelligent individuals. Consistent with the theory, being an ethnic minority, living in urban areas, and socializing with friends less frequently all reduce happiness, but the effects of these conditions are significantly stronger among less intelligent individuals than among more intelligent individuals. The theory can further explain why some individuals suffer from seasonal affective disorder (SAD) and why women’s level of happiness has steadily declined in the United States in the past half-century.

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Capitoli di libri sul tema "Steady State Frequency"

Kundert, Kenneth S., Jacob K. White e Alberto Sangiovanni-Vincentelli. "Mixed Frequency-Time Method". In Steady-State Methods for Simulating Analog and Microwave Circuits, 157–86. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4757-2081-5_7.

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Ju, Wenyun, Kai Sun e Rui Yao. "Steady-State Simulation of Cascading Outages Considering Frequency". In Power Electronics and Power Systems, 239–67. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-48000-3_7.

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Padisák, Judit, Gábor Borics, Gizella Fehér, István Grigorszky, Imre Oldal, Antal Schmidt e Zsuzsa Zámbóné-Doma. "Dominant species, functional assemblages and frequency of equilibrium phases in late summer phytoplankton assemblages in Hungarian small shallow lakes". In Phytoplankton and Equilibrium Concept: The Ecology of Steady-State Assemblages, 157–68. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2666-5_14.

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Mao, Xin, Yang Xiang, Si Qin e Yangxing Liu. "A New Frequency Domain Adaptive Filter Coefficients Updating Method and Its Steady-State Performance in Frequency and Time Domain". In Vibration Engineering for a Sustainable Future, 343–50. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-47618-2_43.

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Tsukano, Takatoshi, Yoshio Kano, Makoto Yamakado e Masato Abe. "Evaluation of Frequency Response Characteristics on “g-g” Planes by Using Quasi-steady State Analysis". In Lecture Notes in Mechanical Engineering, 1398–405. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-38077-9_161.

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Wakatani, Masahiro. "The Steady-State Fusion Reactor". In Stellarator and Heliotron Devices, 395–430. Oxford University PressNew York, NY, 1998. http://dx.doi.org/10.1093/oso/9780195078312.003.0009.

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Abstract First, we discuss the condition for ignition based on the global power balance in section 9.2. In magnetically confined ignited plasmas, heating by neutral beam injection (NBI) or by a radio frequency (RF) electromagnetic wave is replaced by heating due to high-energy charged particles produced by fusion reactions. In deuterium (D) and tritium (T) plasmas, the behavior of alpha particles is the most important issue, as shown in section 9.3. When the heating due to alpha particles, or alpha heating, exceeds the overall energy loss, net energy production is possible by the D-T fusion reaction in the ignited plasma. A total fusion energy, including neutrons, of the order of 3 GW is typically expected in the fusion reactor of the near future.

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Maconie, Robin. "Instruments". In The Concept of Music, 132–39. Oxford University PressOxford, 1990. http://dx.doi.org/10.1093/oso/9780198162155.003.0015.

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Abstract Revision. Music involves tone production, and the production of tones of discernible pitch is the primary function of a majority of musical instruments. For melody and harmony to be created and perceived, there has to be a means of generating a range of pitches whicµ are obviously different from one another, but nevertheless sufficiently related to sound well together. The concept of a verifiable pitch entails a ‘steady-state’ vibration, and the term steady-state implies a certain minimum duration, both for the vibration itself to achieve a steady state having been disturbed into motion, and also in order that the ear may have time to register the fact that the sound in question is indeed relatively unchanging in frequency.

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Goeritno, Arief, Tapip Hendrawan e Irham Muhammad Azama. "Application-Based Simulations for Diagnosing the Power Quality When Changes in Load’s Power on Each Bus as an Analogy of the Steady-State Stability Phenomena". In Power Quality - New Insights [Working Title]. IntechOpen, 2024. http://dx.doi.org/10.5772/intechopen.1002769.

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This chapter describes the system’s ability to recover frequency synchronisation across all networks after a gradual change in electric power is determined by simulating the phenomenon of steady-state stability. The simulation is done by choosing and figuring out an analogy of the structure of an electric power network with four connected buses and assuming values for a number of parameters. The objectives for this diagnostic are set on a pair of primary levels, namely, to create the three syntax structures of the programme based on MATLAB and to simulate a phenomenon of steady-state stability based on the programme. The results of the implementation of steady-state stability simulation have been obtained in the form of phenomena such as a reduction of power on bus #1, an addition of power on bus #2, an addition of power on bus #3, and a reduction of power on bus #4. Based on the simulation results, it can be concluded that the MATLAB-based programme is used for the diagnosis of steady-state stability.

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Barada Mohanty, Dr Kanungo. "TRANSIENT STABILITY ANALYSIS OF INDUCTION MOTOR DRIVE USING NONLINEAR MODEL". In Futuristic Trends in Electrical Engineering Volume 3 Book 1, 192–204. Iterative International Publishers, Selfypage Developers Pvt Ltd, 2024. http://dx.doi.org/10.58532/v3bdee1p4ch2.

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The stability analysis of induction motor normally uses conventional steady state torque-speed characteristics. Study of stability during transient conditions is rather rare in literature. Rigorous analysis for stability based on full nonlinear dynamical model is lacking. For this purpose, stability analysis using the Lyapunov’s theorem is essentially required. Global asymptotic stability for induction motor drive using Lyapunov criteria is analyzed using the full nonlinear dynamical model. The transient model is considered in stationary α-β reference frame about steady state operating point. Equations are derived for energy and power balance. The equations can be used to obtain an appropriate candidate for Lyapunov function for stability analysis. Global asymptotic stability condition in the sense of Lyapunov is derived at any possible speed, with load and without load, with variations in parameters and frequency. These generalized conditions of stability for any operating speed, load, frequency and parameters with a case study for confirmation are the outcomes.

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Imry, Yoseph. "Noise in Mesoscopic Systems". In Introduction to mesoscopic physics, 164–83. Oxford University PressOxford, 2001. http://dx.doi.org/10.1093/oso/9780198507383.003.0008.

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Abstract We shall be concerned here with three main types of noise phenomena: Equilibrium or Nyquist—Johnson noise across a resistor (see eqs. A.9 andA.13–17). Various nonequilibrium or shot-noise phenomena around a steady state with a current flow. Low-frequency, typically “1/f,” noise due to slow changes of the resistance with time.

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Atti di convegni sul tema "Steady State Frequency"

HOLLAND, K., P. NEWELL e P. MAPP. "STEADY STATE AND TRANSIENT LOUDSPEAKER FREQUENCY RESPONSES". In Reproduced Sound 2003. Institute of Acoustics, 2023. http://dx.doi.org/10.25144/18180.

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Bécoulet, A. "Hybrid and Steady-State Operation on JET and Tore Supra". In RADIO FREQUENCY POWER IN PLASMAS: 15th Topical Conference on Radio Frequency Power in Plasmas. AIP, 2003. http://dx.doi.org/10.1063/1.1638031.

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Kazarian-Vilbert, F., X. Litaudon, R. Arslanbekov, G. T. Hoang, D. Moreau e Y. Peysson. "Full steady state LH scenarios in Tore Supra". In The 11th topical conference on radio frequency power in plasmas. AIP, 1996. http://dx.doi.org/10.1063/1.49562.

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Riccardi, C., D. Batani, M. Fontanesi, A. Galassi e E. Sindoni. "Ion Bernstein waves in a toroidal steady-state plama". In The tenth topical conference on radio frequency power in plasmas. AIP, 1994. http://dx.doi.org/10.1063/1.44940.

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Kennedy, Irwin O., Patricia Scanlon, Francis J. Mullany, Milind M. Buddhikot, Keith E. Nolan e Thomas W. Rondeau. "Radio Transmitter Fingerprinting: A Steady State Frequency Domain Approach". In 2008 IEEE 68th Vehicular Technology Conference (VTC 2008-Fall). IEEE, 2008. http://dx.doi.org/10.1109/vetecf.2008.291.

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Sehloff, David, e Line Roald. "Steady State Modeling for Variable Frequency AC Power Flow". In 2020 52nd North American Power Symposium (NAPS). IEEE, 2021. http://dx.doi.org/10.1109/naps50074.2021.9449722.

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Avila, D., e A. Ramirez. "Computation of periodic steady state with reduced frequency order". In 2012 IEEE Power & Energy Society General Meeting. New Energy Horizons - Opportunities and Challenges. IEEE, 2012. http://dx.doi.org/10.1109/pesgm.2012.6345540.

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Pigg, Scott, e Marc Bodson. "Adaptive harmonic steady-state disturbance rejection with frequency tracking". In 2010 49th IEEE Conference on Decision and Control (CDC). IEEE, 2010. http://dx.doi.org/10.1109/cdc.2010.5717729.

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"Steady state plasma operation in RF dominated regimes on EAST". In RADIO FREQUENCY POWER IN PLASMAS: Proceedings of the 21st Topical Conference. EURATOM, 2015. http://dx.doi.org/10.1063/1.4936477.

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Kasugai, Atsushi, Koji Takahashi, Ken Kajiwara, Noriyuki Kobayashi, Keishi Sakamoto, Philip M. Ryan e David Rasmussen. "Demonstration of Steady State Operation with 1 MW of 170 GHz gyrotron for ITER". In RADIO FREQUENCY POWER IN PLASMAS: 17th Topical Conference on Radio Frequency Power in Plasmas. AIP, 2007. http://dx.doi.org/10.1063/1.2800519.

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Rapporti di organizzazioni sul tema "Steady State Frequency"

DeJonckere, P. H., B. Millet, R. Van Gool, A. Martens, M. Lefrancq, L. Litière, E. Meyer e J. Lebacq. Reliability of Electro-physiologically Evoked Auditory Steady State Responses. Progress in Neurobiology, aprile 2024. http://dx.doi.org/10.60124/j.pneuro.2024.10.03.

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The electrophysiological technique of auditory steady state responses (ASSR) makes possible objective hearing threshold definition, with frequency specificity. A high level of reliability is a basic requirement for applying this technique in a medicolegal context. 35 subjects affected by significant occupational noise induced hearing loss and claiming compensation underwent a thorough medical and audiological examination, including an analysis of the auditory steady state responses (ASSR) in order to objectively define hearing thresholds with frequency specificity, and ear-by-ear. In order to investigate the reproducibility of the thresholds obtained by this technique, the electrophysiological exploration was repeated immediately after the first test. An exhaustive statistical comparison of the results rejects the hypothesis of any significant difference between the results of both exams, whatever severity of hearing loss and frequency. All correlation coefficients (R and ICC) and Cronbach’s α values reach or exceed 0.9. Bland-Altman plots rule out systematic shifts, as well as proportional errors, or variations that depends on the magnitude of the measurements.

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Schad, Aaron, Gary Dick, Kris Erickson, Paul Fuhrmann e Lynde Dodd. Vegetation community changes in response to phragmites management at Times Beach, Buffalo, New York. Engineer Research and Development Center (U.S.), settembre 2021. http://dx.doi.org/10.21079/11681/42149.

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Management of invasive phragmites (Phragmites australis [Cav.] Trin. Ex Steud.) in the United States has proven challenging over the last several decades. Various methods for control exist, but integrated approaches appear to have the most success. However, documentation of vegetation community–wide responses to these approaches remains limited. This study monitored plant community changes at Times Beach, New York, over a five-year period. In concert with mowing and thatch removal in all areas, the study evaluated two herbicides separately and together, representing three experimental treatment areas (TAs), for control efficacy by measuring plant community structure. Phragmites was targeted for treatments, avoiding native and nonproblematic non-native species when possible, to preserve beneficial habitat during phragmites control efforts. Monitoring results showed significant drops in phragmites relative cover, relative frequency, and importance values due to integrated management, regardless of herbicide treatment, with corresponding increases in these same values for native and other plant species. This suggests that prudent removal of phragmites is compatible with beneficial plant restorative efforts to maintain and improve habitat in infested areas.

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Galili, Naftali, Roger P. Rohrbach, Itzhak Shmulevich, Yoram Fuchs e Giora Zauberman. Non-Destructive Quality Sensing of High-Value Agricultural Commodities Through Response Analysis. United States Department of Agriculture, ottobre 1994. http://dx.doi.org/10.32747/1994.7570549.bard.

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The objectives of this project were to develop nondestructive methods for detection of internal properties and firmness of fruits and vegetables. One method was based on a soft piezoelectric film transducer developed in the Technion, for analysis of fruit response to low-energy excitation. The second method was a dot-matrix piezoelectric transducer of North Carolina State University, developed for contact-pressure analysis of fruit during impact. Two research teams, one in Israel and the other in North Carolina, coordinated their research effort according to the specific objectives of the project, to develop and apply the two complementary methods for quality control of agricultural commodities. In Israel: An improved firmness testing system was developed and tested with tropical fruits. The new system included an instrumented fruit-bed of three flexible piezoelectric sensors and miniature electromagnetic hammers, which served as fruit support and low-energy excitation device, respectively. Resonant frequencies were detected for determination of firmness index. Two new acoustic parameters were developed for evaluation of fruit firmness and maturity: a dumping-ratio and a centeroid of the frequency response. Experiments were performed with avocado and mango fruits. The internal damping ratio, which may indicate fruit ripeness, increased monotonically with time, while resonant frequencies and firmness indices decreased with time. Fruit samples were tested daily by destructive penetration test. A fairy high correlation was found in tropical fruits between the penetration force and the new acoustic parameters; a lower correlation was found between this parameter and the conventional firmness index. Improved table-top firmness testing units, Firmalon, with data-logging system and on-line data analysis capacity have been built. The new device was used for the full-scale experiments in the next two years, ahead of the original program and BARD timetable. Close cooperation was initiated with local industry for development of both off-line and on-line sorting and quality control of more agricultural commodities. Firmalon units were produced and operated in major packaging houses in Israel, Belgium and Washington State, on mango and avocado, apples, pears, tomatoes, melons and some other fruits, to gain field experience with the new method. The accumulated experimental data from all these activities is still analyzed, to improve firmness sorting criteria and shelf-life predicting curves for the different fruits. The test program in commercial CA storage facilities in Washington State included seven apple varieties: Fuji, Braeburn, Gala, Granny Smith, Jonagold, Red Delicious, Golden Delicious, and D'Anjou pear variety. FI master-curves could be developed for the Braeburn, Gala, Granny Smith and Jonagold apples. These fruits showed a steady ripening process during the test period. Yet, more work should be conducted to reduce scattering of the data and to determine the confidence limits of the method. Nearly constant FI in Red Delicious and the fluctuations of FI in the Fuji apples should be re-examined. Three sets of experiment were performed with Flandria tomatoes. Despite the complex structure of the tomatoes, the acoustic method could be used for firmness evaluation and to follow the ripening evolution with time. Close agreement was achieved between the auction expert evaluation and that of the nondestructive acoustic test, where firmness index of 4.0 and more indicated grade-A tomatoes. More work is performed to refine the sorting algorithm and to develop a general ripening scale for automatic grading of tomatoes for the fresh fruit market. Galia melons were tested in Israel, in simulated export conditions. It was concluded that the Firmalon is capable of detecting the ripening of melons nondestructively, and sorted out the defective fruits from the export shipment. The cooperation with local industry resulted in development of automatic on-line prototype of the acoustic sensor, that may be incorporated with the export quality control system for melons. More interesting is the development of the remote firmness sensing method for sealed CA cool-rooms, where most of the full-year fruit yield in stored for off-season consumption. Hundreds of ripening monitor systems have been installed in major fruit storage facilities, and being evaluated now by the consumers. If successful, the new method may cause a major change in long-term fruit storage technology. More uses of the acoustic test method have been considered, for monitoring fruit maturity and harvest time, testing fruit samples or each individual fruit when entering the storage facilities, packaging house and auction, and in the supermarket. This approach may result in a full line of equipment for nondestructive quality control of fruits and vegetables, from the orchard or the greenhouse, through the entire sorting, grading and storage process, up to the consumer table. The developed technology offers a tool to determine the maturity of the fruits nondestructively by monitoring their acoustic response to mechanical impulse on the tree. A special device was built and preliminary tested in mango fruit. More development is needed to develop a portable, hand operated sensing method for this purpose. In North Carolina: Analysis method based on an Auto-Regressive (AR) model was developed for detecting the first resonance of fruit from their response to mechanical impulse. The algorithm included a routine that detects the first resonant frequency from as many sensors as possible. Experiments on Red Delicious apples were performed and their firmness was determined. The AR method allowed the detection of the first resonance. The method could be fast enough to be utilized in a real time sorting machine. Yet, further study is needed to look for improvement of the search algorithm of the methods. An impact contact-pressure measurement system and Neural Network (NN) identification method were developed to investigate the relationships between surface pressure distributions on selected fruits and their respective internal textural qualities. A piezoelectric dot-matrix pressure transducer was developed for the purpose of acquiring time-sampled pressure profiles during impact. The acquired data was transferred into a personal computer and accurate visualization of animated data were presented. Preliminary test with 10 apples has been performed. Measurement were made by the contact-pressure transducer in two different positions. Complementary measurements were made on the same apples by using the Firmalon and Magness Taylor (MT) testers. Three-layer neural network was designed. 2/3 of the contact-pressure data were used as training input data and corresponding MT data as training target data. The remaining data were used as NN checking data. Six samples randomly chosen from the ten measured samples and their corresponding Firmalon values were used as the NN training and target data, respectively. The remaining four samples' data were input to the NN. The NN results consistent with the Firmness Tester values. So, if more training data would be obtained, the output should be more accurate. In addition, the Firmness Tester values do not consistent with MT firmness tester values. The NN method developed in this study appears to be a useful tool to emulate the MT Firmness test results without destroying the apple samples. To get more accurate estimation of MT firmness a much larger training data set is required. When the larger sensitive area of the pressure sensor being developed in this project becomes available, the entire contact 'shape' will provide additional information and the neural network results would be more accurate. It has been shown that the impact information can be utilized in the determination of internal quality factors of fruit. Until now,

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