Search Results
Results 401 - 450 of 1034
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Yoshida Mitsuyoshi - - 2006
The tongue plays a key role in oropharyngeal swallowing. It has been reported that maximum isometric tongue pressure decreases with age. The risk for dysphagia resulting from low tongue strength remains unclear. This study was designed to reveal the relationship between tongue pressure and clinical signs of dysphagic tongue movement ...
Kodaira Y - - 2006
The aim of this study was first to investigate whether the covering of the palatal mucosa with a denture base affects or not the bolus-propulsion time, and second if there was such an effect then investigate the possible contributory factors which have influence on the propulsion time. The propulsion time ...
Yoon Yong-Jin - - 2006
Intracochlear pressure and basilar membrane (BM) velocity are calculated from a physiologically based chinchilla cochlea model . The model includes three-dimensional viscous fluid and the pectinate zone of the elastic BM with dimensional and material property variation along its length. The passive response shows excellent agreement with measurement at high ...
Gregory James W - - 2006
Pressure-sensitive paint is presented and evaluated in this article as a quantitative technique for measurement of acoustic pressure fluctuations. This work is the culmination of advances in paint technology which enable unsteady measurements of fluctuations over 10 kHz at pressure levels as low as 125 dB. Pressure-sensitive paint may be ...
Chen Jinghan - - 2006
There are strong evidences to support that the modification of the characteristics of the second heart sound has a high correlation with the pulmonary arterial pressure (PAP). It is hence postulated that a specific heart sound spectrum for this disease group could be generated as a decision support system to ...
Lee Byung Joo - - 2006
Prevention and treatment of vocal fold scarring and atrophy remain challenging. The aim of this study was to treat injured vocal folds using autologous adipose tissue-derived stromal cells (ADSCs) and evaluate the ability to prevent vocal fold scarring and atrophy by ADSCs in a canine animal model. Ten adult dogs ...
Chandra Deven - - 2006
The variable-pitch pulse oximeter is an important intraoperative patient monitor. Our ability to hear its auditory signal depends on its acoustical properties and our hearing. This study quantitatively describes the audio spectrum and sound pressure levels of the monitoring tones produced by five variable-pitch pulse oximeters. We compared the Datex-Ohmeda ...
Albarracín Ana L - - 2006
Rats distinguish objects differing in surface texture by actively moving their vibrissae. In this paper we characterized some aspects of texture sensing in anesthetized rats during active touch. We analyzed the multifiber discharge from a deep vibrissal nerve when the vibrissa sweeps materials (wood, metal, acrylic, sandpaper) having different textures. ...
Larsen P D - - 2006
The underlying tempo of different types of music may have an effect on heart rate and blood pressure.
Tanner Kristine - - 2005
PURPOSE: This investigation was undertaken to examine the status of the velopharyngeal (VP) port during classical singing. METHOD: Using aeromechanical instrumentation, nasal airflow (mL/s), oral pressure (cm H2O), and VP orifice area estimates (cm2) were studied in 10 classically trained sopranos during singing and speaking. Each participant sang and spoke ...
Wahlberg Magnus - - 2005
A sperm whale (Physeter macrocephalus) was observed at the surface with above- and underwater video and synchronized underwater sound recordings. During seven instances the whale ventilated its lungs while clicking. From this observation it is inferred that click production is achieved by pressurizing air in the right nasal passage, pneumatically ...
Makihara Eri - - 2005
PURPOSE: The purpose of this study was to determine a baseline value of tongue pressure on the palatal region in normal subjects that could then be used to assist in fabrication of a palatal augmentation prosthesis (PAP). MATERIALS AND METHODS: A tongue-pressure measurement system with 36 rubber pressure sensors was ...
Kahane J C - - 2006
The bassoon is a demanding double-reed woodwind instrument requiring exquisite control of airflow and air pressure to the reed to produce desired tonal characteristics. Little information is available from direct visualization of the vocal tract and larynx of the bassoonist while playing. Of particular interest is the mechanism(s) of vibrato. ...
Wethey David S - - 2005
Many activities by infauna, including burrowing and feeding, involve hydraulic mechanisms. We expected these activities to generate low-frequency pressure waves that would propagate through sediments and be detectable at some distance from the source. Pressure sensors in intertidal sediments recorded large-amplitude porewater pressure signals. Laboratory recordings of single individuals allowed ...
Al-Qahtani Noura H - - 2005
OBJECTIVE: To examine whether prenatal exposure to music and voice alters foetal behaviour and whether foetal response to music differs from human voice. SUBJECTS AND METHODS: A prospective observational study was conducted in 20 normal term pregnant mothers. Ten foetuses were exposed to music and voice for 15 s at ...
Slifka Janet - - 2006
This article examines respiratory and acoustic events at the ends of utterances that coincide with the end of a breath. All utterances end with a vowel. Between the start of the final fall in signal amplitude and the end of phonation, the alveolar pressure falls by 1.2-2.6 cm H2O, on ...
R?s?nen Jukka - - 2005
OBJECTIVE: To evaluate the effect of positive end-expiratory pressure on the sound filtering characteristics of injured lungs. DESIGN AND SETTING: Prospective experimental study in the animal laboratory in an academic medical center. PATIENTS AND PARTICIPANTS: Six 35- to 45-kg anesthetized, intubated pigs. INTERVENTIONS: Acute lung injury with intravenous oleic acid. ...
Zhang Yu - - 2005
Spatiotemporal chaos in excised larynx vibrations is reported using high-speed digital imaging. Spatiotemporal correlation and eigenmode analyses are applied to describe the spatiotemporal dynamics of the vocal fold vibrations and to investigate the effects of subglottal pressure. High subglottal pressures cause spatiotemporal chaos with decreased spatiotemporal correlation and increased entropy ...
Hartl Dana M - - 2005
OBJECTIVE: To analyze laryngeal aerodynamics in the same patient in 4 different circumstances: before the onset of unilateral vocal fold paralysis (UVFP), after the onset of UVFP, and after 2 types of surgical vocal fold medialization techniques to compare the results of surgery with the measurements made in that same ...
Björkner Eva - - 2006
Musical theater singing typically requires women to use two vocal registers. Our investigation considered voice source and subglottal pressure P(s) characteristics of the speech pressure signal recorded for a sequence of /pae/ syllables sung at constant pitch and decreasing vocal loudness in each register by seven female musical theater singers. ...
Heaton James T - - 2005
OBJECTIVES: Intraoperative assessment of vocal fold vibration during phonomicrosurgery performed under general anesthesia may enhance surgical decision-making. We therefore developed and bench-tested a new device we refer to as the aerodynamic vocal fold driver (AVFD). MATERIALS AND METHODS: The AVFD comprises a hand-held probe that uses airflow to drive individual ...
Madsen P T - - 2005
Current mitigation levels for noise transients impinging on marine mammals are specified by rms pressures. The rms measure critically relies upon choosing the size of averaging window for the squared pressures. Derivation of this window is not standardized, which can lead to 2-12 dB differences in rms sound pressure for ...
Hakin Andrew W - - 2005
The pulse echo overlap technique has been used in conjunction with three unique high-pressure cells to measure ultrasonic speeds of sound in dilute aqueous solutions of the alcohols 2-propanol, 2-butanol, 2-propanol and 2-hexanol and the diols 1,4-butanediol, 1-5-pentanediol and 1,6-hexanediol at p = 0.1, 20.0, 40.0, 60.0, 80.0 and 120.0 ...
Williams William N - - 2005
OBJECTIVE: This study assessed a single subject's ability to detect the difference limen (DLs) for his self-generated intraoral air pressure while his oral and nasal cavities were experimentally coupled. METHOD: The subject, a 46-year-old man, uses a speech bulb prosthesis to cover an unrepaired cleft of his hard and soft ...
Laukkanen Anne-Maria - - 2005
'Voice massage' (VM) treatment includes manipulation of muscles related to speech production and voice and breathing exercises. This study investigated the effects of VM in 10 healthy subjects (5 females, 5 males). They recorded repetitions of the word 'paappa' at normal loudness and as softly as possible and read a ...
Tomei Francesco - - 2005
The role of occupational exposure to noise as a hypertension risk factor has not been established sufficiently. The aim of the study is to evaluate whether chronic exposure to different levels of noise in two groups of pilots, operating with two types of aircraft, could be a risk for hypertension, ...
Ricot Denis - - 2005
The accordion reed is an example of a blown-closed free reed. Unlike most oscillating valves in wind musical instruments, self-sustained oscillations occur without acoustic coupling. Flow visualizations and measurements in water show that the flow can be supposed incompressible and potential. A model is developed and the solution is calculated ...
Lucero Jorge C - - 2005
In this study we use a low-dimensional laryngeal model to reproduce temporal variations in oral airflow produced by speakers in the vicinity of an abduction gesture. It attempts to characterize these temporal patterns in terms of biomechanical parameters such as glottal area, vocal fold stiffness, subglottal pressure, and gender differences ...
Asuquo, UE; Physics Department, ...
Blood pressure of factory workers (study group) and office workers/students (control group) have been measured when they were exposed to a steady source of noise of about 110 dB(A). Results obtained show that people could be adapted to noise from steady sources. No significant increase in the Systolic Pressure and ...
Huber Jessica E - - 2005
The purpose of the present study was to determine whether different cues to increase loudness in speech result in different internal targets (or goals) for respiratory movement and whether the neural control of the respiratory system is sensitive to changes in the speaker's internal loudness target. This study examined respiratory ...
Sundberg Johan - - 2005
Subglottal pressure is one of the main voice control factors, controlling vocal loudness. In this investigation the effects of subglottal pressure variation on the voice source in untrained female and male voices phonating at a low, a middle, and a high fundamental frequency are analyzed. The subjects produced a series ...
Banerjee A - - 2005
A new cause of sound and pressure induced vertigo, superior canal dehisence, is described. Auditory manifestations include hyperacusis to bone-conducted sounds and conductive hearing loss with normal acoustic reflexes. The diagnosis is reached by a directed history, documentation of upward and torsional nystagmus evoked by sound and pressure, and radiology. ...
Paskalev Dobrin - - 2005
In 1905, Dr. Nikolai Korotkoff (1874-1920), a Russian surgeon, discovered a simple and precise technique to measure arterial pressure. He was born on 26th February 1874 in the central Russian city of Kursk. Korotkoff graduated from the Medical Faculty of Moscow University in 1898, but he worked later in the ...
Brusco Matias - - 2005
Last year at the EMBC 2004 in San Francisco, we presented a paper entitled: "Digital Phonocardiography: a PDA-based Approach", which introduced the development of a PDA-based biomedical instrument capable of acquiring, processing, and analysis of heart sounds. In this paper we present a system, which is not only able to ...
Bian Lin - - 2004
Distortion product otoacoustic emissions (DPOAEs) are generated from the nonlinear transduction n cochlear outer hair cells. The transducer function demonstrating a compressive nonlinearity can be estimated from low-frequency modulation of DPOAEs. Experimental results from the gerbils showed that the magnitude of quadratic difference tone (QDT, f2-f1) was either enhanced or ...
Fligor Brian J - - 2004
OBJECTIVE: To measure the sound levels generated by the headphones of commercially available portable compact disc players and provide hearing healthcare providers with safety guidelines based on a theoretical noise dose model. DESIGN: Using a Knowles Electronics Manikin for Acoustical Research and a personal computer, output levels across volume control ...
Jiang Jack - - 2004
Aerodynamic parameters provide objective and quantitative measures of laryngeal functional status. Jiang et al previously introduced an airflow interruption technique that can determine mean phonatory airflow, subglottic pressure, and phonation threshold pressure simultaneously and noninvasively. In this study, we performed receiver operating characteristic (ROC) analysis to evaluate this airflow interruption ...
Kelley Darcy B - - 2004
The robust nature of vocal communication in frogs has long attracted the attention of natural philosophers and their biologically inclined successors. Each frog species produces distinctive calls that facilitate pre-mating reproductive isolation and thus speciation. In many terrestrial species, a chorus of simultaneously calling males attracts females to breeding sites; ...
Rosenbaum Robert A - - 2004
STUDY OBJECTIVE: Patients with communicable diseases may require respiratory isolation to reduce the chance of transmission to health care workers and the public. This project was conducted to determine whether negative-pressure isolation for multiple patients can be achieved quickly and effectively using general hospital space not previously dedicated to respiratory ...
Plant Randall L - - 2004
Phonation threshold pressures were directly measured in five normal subjects in a variety of voicing conditions. The effects of fundamental frequency, intensity, closure speed of the vocal folds, and laryngeal airway resistance on phonation threshold pressures were determined. Subglottic air pressures were measured using percutaneous puncture of the cricothyroid membrane. ...
Sprague Mark W - - 2004
Simultaneous audio and video were recorded of a silver perch Bairdiella chrysoura producing its characteristic drumming sound in the field. The background noise contribution to the total sound pressure level is estimated using sounds that occurred between the pulses of the silver perch sound. This background contribution is subtracted from ...
Einstein D R - - 2004
Automatic acoustic classification and diagnosis of mitral valve disease remain outstanding biomedical problems. Although considerable attention has been given to the evolution of signal processing techniques, the mechanics of the first heart sound generation has been largely overlooked. In this study, the haemodynamic determinants of the first heart sound were ...
Rousseau Bernard - - 2004
To examine the functional effects of hyaluronan and collagen alterations in acute vocal fold scar, we injured 15 pig larynges by vocal fold mucosa stripping. At 3, 10, and 15 days after operation, we performed excised larynx experiments to measure phonation threshold pressure (PTP) and vocal economy (an acoustic output-cost ...
Huber Jessica E - - 2004
One of the most important areas of study in speech motor control is the identification of control variables, the variables controlled by the nervous system during motor tasks. The current study examined two hypotheses regarding control variables in speech production: (1) pressure and resistance in the vocal tract are controlled, ...
Stahlberg Rainer - - 2005
Slow wave potentials (SWPs) are transitory depolarizations occurring in response to treatments that result in a pressure increase in the xylem conduits (P(x)). Here SWPs are induced by excision of the root under water in 40- to 50-cm-tall light-grown sunflower plants in order to determine the effective signal range to ...
Murdoch Bruce E - - 2004
PRIMARY OBJECTIVE: To extend the capabilities of current electropalatography (EPG) systems by developing a pressure-sensing EPG system. An initial trial of a prototype pressure-sensing palate will be presented. RESEARCH DESIGN: The processes involved in designing the pressure sensors are outlined, with Hall effect transistors being selected. These units are compact, ...
Butcher Andrew - - 2004
The terms fortis and lenis are variously regarded as having one single underlying phonetic correlate or many. An exploratory analysis of acoustic and aerodynamic data on contrasting stop series in a number of European and non-European languages confirms that a significant variation in peak intra-oral pressure and in articulatory stricture ...
Mishima Riho - - 2004
Effects of sound generated by a dental turbine and a small stream (murmur) and the effects of no sound (null, control) on heart rate, systolic and diastolic blood pressure, and hemodynamic changes (oxygenated, deoxygenated, and total hemoglobin concentrations) in the frontal cortex were measured in 18 young volunteers. Questionnaires completed ...
Nasiraei-Moghaddam Abbas - - 2004
In this work the effects of noise, resolution, and velocity (flow) on the measurement of intravascular pressure from phase-contrast (PC) MRI are discussed. To elucidate these effects, we employed an axisymmetric geometry that enabled us to calculate pressures in <2 min on a Sun Ultra SPARC 10 workstation. To determine ...
Noppen M - - 2004
Most cases of primary spontaneous pneumothorax are thought to be caused by air leaks at so-called "emphysema-like changes" or in areas of pleural porosity at the surface of the lung. Environmental pressure swings may cause air leaks as a result of transpulmonary pressure changes across areas of trapped gas in ...
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