Sinusoidal Excitation
Mostrando 1-12 de 21 artigos, teses e dissertações.
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1. Preliminary results of cervical impedance measurements
AbstractIntroduction: In this work, we report the development and initial tests of a measuring system that is used to measure the cervical electrical impedance with the purpose of assessing cervical ripening. The objective is to offer a system that provides real-time information about the cervical electrical impedance and, indirectly, of the cervical ripeni
Res. Biomed. Eng.. Publicado em: 17/05/2018
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2. Brainstem Encoding of Aided Speech in Hearing Aid Users with Cochlear Dead Region(s)
Abstract Introduction Neural encoding of speech begins with the analysis of the signal as a whole broken down into its sinusoidal components in the cochlea, which has to be conserved up to the higher auditory centers. Some of these components target the dead regions of the cochlea causing little or no excitation. Measuring aided speechevoked auditory brain
Int. Arch. Otorhinolaryngol.. Publicado em: 2016-09
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3. Detecção condutométrica sem contato: uma nova ferramenta para monitoramento de interações biomoleculares em microssistemas analíticos / Contactless conductivity detection: a new tool for monitoring biomolecular interactions on analytical microsystems
The study reported in this thesis shows the application of a capacitively coupled contactless conductivity detection (C4D) for monitoring biomolecular interactions on analytical microsystems. Initially, the analytical performance of the microsystems fabricated in glass, poly(dimethylsiloxane) (PDMS) and polyester-toner (PT) was investigated in order to choos
Publicado em: 2008
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4. Identificação on-line de motores de indução através de modelo discreto para sinais senoidais
In this work are developed two on-line identification methods for three-phase induction motors based on discrete models obtained when we consider continuous systems excited by sinusoidal signals. The first method uses the discrete model of the homopolar machine in the stationary frame to estimate the stator resistance and the stator dispersion inductance and
Publicado em: 2006
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5. Estudo e Aperfeiçoamento do Vocoder de Transformada Senoidal
The basic sinusoidal analysis/synthesis system is presented and recent parameters codification techniques are studied. In addition, new methods for improving the speech quality of Sinusoidal Transform Vocoders at 2,4 and 4,8 Kbps are presented. One of them is a refinement in the pitch estimation, since pitch accuracy is essential for the efficiency of the ha
Publicado em: 2004
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6. Experimental Vibration Characteristics of a Beam with Nonlinear Support Using Receptance Coupling Analysis
This paper applies the Multi-Harmonic Nonlinear Receptance Coupling Approach (MUHANORCA) (Ferreira 1998) to evaluate the frequency response characteristics of a beam which is clamped at one end and supported at the other end by a nonlinear cubic stiffness joint. In order to apply the substructure coupling technique, the problem was characterised by coupling
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2002-05
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7. Analysis of Regular and Irregular Dynamics of a Non Ideal Gear Rattling Problem
This paper presents a study on the dynamics of the rattling problem in gearboxes under non-ideal excitation. The subject has being analyzed by a number of authors such as Karagiannis and Pfeiffer (1991), for the ideal excitation case. An interesting model of the same problem by Moon (1992) has been recently used by Souza and Caldas (1999) to detect chaotic b
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2002-05
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8. SIMULAÇÃO DIGITAL NO TEMPO DE REDES ELÉTRICAS LINEARES EXCITADAS POR SENÓIDES NO ENTORNO DE UMA FREQÜÊNCIA / TIME DOMAIN DIGITAL SIMULATION OF LINEAR ELECTRICAL NETWORKS EXCITED BY SINUSOIDAL INPUT IN THE NEIGHBORHOOD OF A FREQUENCY
The simulation of linear systems with sinusoidal input has a very simple solution by transform methods. However, when the network is of large scale and the frequency of excitation is unknown, this fasorial analysis method is not satisfactory because of its complexity. Several processes of computer analysis have been developed recently addressing the problem
Publicado em: 1999
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9. Different types of tremor in the human thumb.
1. The upper limbs of normal subjects were immobilized in a way that allowed measurement of forces and movements at the thumb interphalangeal joint without significant movement elsewhere in the limb. 2. When the subject attempted to maintain a steady flexing force at the joint against a rigid stop, the actual force showed the irregular 8-11 Hz fluctuations c
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10. An optimized approach to membrane capacitance estimation using dual-frequency excitation.
We present an optimized solution to the problem of membrane impedance estimation when a patch-clamped cell is stimulated by a dual-frequency, sinusoidal excitation. The complete data set of raw whole-cell current samples is typically reduced, via digital lock-in detection, to measurements of the complex cell model admittance at the two stimulus frequencies.
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11. Spindle and motoneuronal contributions to the phase advance of the human stretch reflex and the reduction of tremor.
1. The human stretch reflex is known to produce a phase advance in the EMG reflexly evoked by sinusoidal stretching, after allowing for the phase lag introduced by simple conduction. Such phase advance counteracts the tendency to tremor introduced by the combined effect of the conduction delay and the slowness of muscle contraction. The present experiments c
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12. Factors influencing threshold of the fundamental electrical response to sinusoidal excitation of human photoreceptors.
The amplitude and phase of the fundamental Fourier component of the electroretinogram (e.r.g.) in response to sinusoidally modulated light were studied in the range 7-50 Hz. Sensitivity was best at the lowest frequency. The threshold-frequency relationship divided into two parts. A weak steady background depressed sensitivity of the low, but increased sensit