Communication Disorders and Personality

Glozman, Janna M.

doi:10.1007/978-1-4419-9288-8

Cited by 26 publications

(31 citation statements)

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“…3b where the solid lines lie above the dotted lines at high frequencies above: the self-capacitance of the piezoelectric element at high frequencies is less. This fact has long been known [1,8,9,11].…”

Section: Effect Of the Passive Elements Of The Circuit On Measurementsmentioning

confidence: 92%

Admittance–frequency response of a thin piezoceramic half-disk

Карлаш

2009

Int Appl Mech

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Results on the resonant electromagnetic vibrations of piezoceramic half-disks are analyzed, systematized, and generalized. Considerable attention is paid to new experimental methods for and results of studying resonant vibrations Introduction. The resonant electromechanical vibrations of a thin half-disk made of TsTS-19 piezoceramic were first described in [14] where an original method was used: the resonant frequencies of a piezoelectric element were measured from the maximum shunting effect on the output resistor of a voltage divider. As in the ordinary Meson circuit [1], the voltage divider (two series-connected resistors, 56 W and 5.6 W) is connected between a GZ-56/1 generator and the piezoelectric element. The output voltage of the generator is set so that the voltage drop across the 5.6 W resistor is 100 mV in the absence of the piezoelectric element. As the generator frequency is varied, the admittance of the piezoelectric element changes, peaking at the resonant frequencies. As a result, the voltage across the parallel-connected resistor and piezoelectric element increases by a factor of 1/K, and it becomes possible to determine the resonant admittance of the piezoelectric element and to measure its resonant frequency. In [14], resonant frequencies, admittances, and impedances for 10 vibration modes were determined. The height and azimuthal distributions of dynamic mechanical stresses obtained with the piezotransformer transducer method (PTTM) [5][6][7] were analyzed too. The antiresonance frequencies and admittances were not considered. Note that the electromechanical vibrations of piezoceramic bodies (shells and plates) were also studied in [17, 18, etc.] The present paper studies the behavior of the admittance of a piezoceramic half-disk in a frequency range that includes resonance and antiresonance frequencies, and proposes a new highly accurate experimental method to determine the admittance of piezoelectric elements at any frequency. Advantages and Disadvantages of the Mason Circuit.After the close (in frequency) current and voltage resonances in piezoelectric elements had been experimentally discovered, it became necessary to develop a method to determine the associated frequencies. In many cases, the simple Mason circuit (Fig. 1) detailed in [1-3, 7, 8, 11] is used.The basic advantage of the Mason circuit is the possibility to measure the frequencies of maximum and minimum admittances. The shunting method [14] and PTTM [5][6][7] are incapable of doing this. These methods measure the maximum shunting frequency and the maximum piezotransformer ratio frequency, respectively. Both these frequencies are close yet unequal to the resonance frequencies. At the electromechanical resonance frequencies, piezoceramic elements behave (in relation to the external ultrasonic generator) as an oscillatory circuit, which consists of series-connected inductance coil L k , capacitor C k , and loss resistor R k . The scalar impedance Z k of this system at a circular frequency w is defined as follows [4]:

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Section: Effect Of the Passive Elements Of The Circuit On Measurementsmentioning

confidence: 92%

Admittance–frequency response of a thin piezoceramic half-disk

Карлаш

2009

Int Appl Mech

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“…The ideas of Glozman require necessarily a Δ 7/2 − resonance at about the same mass [114]. For such a resonance, there is no evidence at all!…”

Section: What Is the Dynamical Reason For The Existence Of Parity Doumentioning

confidence: 99%

Partial wave analysis

2017

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Abstract. The project A.2 of the SFB/TR16 "Subnuclear Structure of Matter" aimed at a combined multichannel partial wave analysis of all or of most data on pion and photo-induced reactions for invariant masses from the Δ(1232) region to 2300 MeV. In this review the most important results are presented. It is shown that the data and their partial wave analysis have improved our understanding of the dynamics of excited light-quark baryons significantly.

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“…Subjects from both experimental groups completed the Spielberger (Bunevicius et al, 2013;Devier et al, 2009; for a detailed review, see Glozman, 2004;Özpelit et al, 2015). In our study, we have indeed utilized STAI scores as a continuous variable to determine possible correlations with RePi.…”

Section: Anxiety Measuresmentioning

confidence: 99%

Correlation between maternal anxiety, reactivity of fetal cerebral circulation to auditory stimulation, and birth outcome in normotensive and gestational hypertensive women

Vujović¹,

Sovilj²,

Jeličić³

et al. 2017

Developmental Psychobiology

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This study investigated the correlation between maternal anxiety and blood flow changes through the fetal middle cerebral artery (MCA) after defined acoustic stimulation in 43 normotensive (C) and 40 gestational hypertensive (GH) subjects.Neonatal outcomes (gestational age at birth, Apgar score, birth weight) in the C and GH groups were analyzed. State (STAI-S) and trait (STAI-T) anxiety was assessed using Spielberger's questionnaire. The MCA blood flow was assessed once between 28 and 41 weeks of gestation using color Doppler ultrasound before and after application of defined acoustic stimulus. Relative size of the Pulsatility index (Pi) change (RePi) was calculated. The general hypotheses were: (1) women in GH group would have higher anxiety; (2) higher anxiety correlates with higher RePi change and poorer neonatal outcome; (3) fetuses from the GH group would have poorer neonatal outcome.Subjects from the GH group had higher STAI-T and RePi compared to the C group. A positive correlation between RePi and STAI-S, STAI-T, and systolic/diastolic blood pressure was found in both groups. There were more preterm deliveries in the GH group compared to the C group. A significant effect of STAI-T on body weight was observed in the C and GH group. There was a predictive effect of STAI-T and RePi on the C group, and STAI-S, STAI-T, diastolic blood pressure, and RePi on the GH group in terms of neonatal body weight. This study demonstrates an association between antenatal anxiety in GH women and increased fetal cerebral circulation in response to defined auditory stimulation. K E Y W O R D Sbirth outcomes, defined acoustic stimulation, fetal cerebral circulation, gestational hypertension, maternal anxiety

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Communication Disorders and Personality

Cited by 26 publications

References 0 publications

Admittance–frequency response of a thin piezoceramic half-disk

Admittance–frequency response of a thin piezoceramic half-disk

Partial wave analysis

Correlation between maternal anxiety, reactivity of fetal cerebral circulation to auditory stimulation, and birth outcome in normotensive and gestational hypertensive women

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