Search Results
Results 251 - 300 of 1064
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Dalecki Diane - - 2009
Underwater acoustic impulse sources are used in various commercial and military applications. The objective of this study was to investigate the response of mammalian lung to exposure to underwater acoustic impulses. A laboratory-based acoustic exposure system was developed to investigate the bioeffects of underwater impulses. Underwater acoustic impulses were generated ...
Zhang Zhaoyan - - 2009
Dependence of phonation threshold pressure and phonation onset frequency on vocal fold geometry was numerically investigated in a continuum model of the vocal folds. The geometric parameters of interest include the medial surface thickness, vocal fold depths of the body, and cover layers. Changes in these parameters may occur either ...
Lee Jongshill - - 2009
OBJECTIVES: Validation of blood pressure measurement devices is always difficult because the gold standard method depends on the observer's manual assessment. To improve the assessment algorithm in automatic blood pressure measurement devices, knowing the reference blood pressure values and analyzing various data are always necessary. A digital system to record ...
Plitnik G R - - 2009
Given certain design constraints, such as the type of stop being voiced and the desired tone quality, organ reed voicers must curve each tongue so as to produce the best and most stable tone, as well as maintaining a consistent tone quality across an entire rank of pipes. This study ...
Hastings Mardi C - - 2009
A vibroacoustic model for sound radiation from a submerged pile was developed to predict sound pressure levels generated during offshore construction activities. It was implemented in MATLAB and verified with measured data reported in the literature. The modal response of a cylindrical pile to hammer impact is first determined. Contributions ...
Park Joseph - - 2009
The rotary subwoofer is a novel acoustic transducer capable of projecting infrasonic signals at high sound pressure levels. The projector produces higher acoustic particle velocities than conventional transducers which translate into higher radiated sound pressure levels. This paper characterizes measured performance of a rotary subwoofer and presents a model to ...
Goodweiler Nicholas P - - 2009
A single-reed duck call features a reed of Mylar or similar elastic material mounted above a curved tone channel. The arrangement resembles that of a clarinet, except that the extreme curve of the tone channel (compared to the relatively flat lay of the clarinet) allows for a rather large volume ...
Ryberg Johanna Bengtsson - - 2009
The highest recommended sound pressure levels for leisure sounds (music) in Sweden are 100 dB LAeq and 115 dB LAFmax for adults, and 97 dB LAeq and 110 dB LAFmax where children under the age of 13 have access. For arrangements intended for children, levels should be consistently less than ...
Wu Sean - - 2009
In the design of quiet automobile compartments, one analyzes the influence of individual panels and enclosure surface leaks on noise received in a specific region (the location of the driver's ear position). Two recent papers [Hald et al., Internoise (2006); Wolff, Internoise (2007)] suggest the needed measurement process can be ...
Bigelow Timothy A - - 2009
Therapeutic ultrasound has shown potential for improving many aspects of medical care in recent years. Therapeutic ultrasound often involves high pressures or intensities, but pressures and intensities in tissue are limited by nonlinear propagation. The impact of nonlinear propagation is most severe for therapies involving cavitation where the peak rarefactional ...
Miles R N - - 2009
A miniature differential microphone is described having a low-noise floor. The sensitivity of a differential microphone suffers as the distance between the two pressure sensing locations decreases, resulting in an increase in the input sound pressure-referred noise floor. In the microphone described here, both the diaphragm thermal noise and the ...
Oosterlinck Maarten - - 2010
Subtle lameness in horses may be difficult to diagnose and methods to evaluate lameness objectively are useful when equine clinicians fail to reach a consensus. The aim of this study was to determine whether equine pressure plate measurements are repeatable when used to calculate forelimb loading (peak vertical pressure [PVP], ...
Lenius K - - 2009
This study investigated the relationship between lingual-palatal pressures and submental surface electromyographic (sEMG) signals. During isometric and isotonic tongue press tasks, lingual-palatal pressures from the anterior, middle and posterior hard palate and submental sEMG signals were recorded. Peak values of both tasks and mean values of the isotonic task were ...
Connor C W - - 2009
Threshold systolic arterial pressure alarms often use pre-operative values as a guide for intra-operative values. Recently, two systems (normalisation and principal component analysis) have been described that use the 'current' systolic arterial pressure and the change in systolic arterial pressure over a preceding time interval to generate an alarm based ...
Kotby M N - - 2009
OBJECTIVE: The aim of this work is to study the hitherto unclear aerodynamic parameters of the pseudo-glottis following total laryngectomy. These parameters include airflow rate, sub-pseudo-glottic pressure (SubPsG), efficiency and resistance, as well as sound pressure level (SPL). PATIENTS AND METHODS: Eighteen male patients who have undergone total laryngectomy, with ...
Enflo Laura - - 2009
Abstract Phonation threshold pressure (PTP), frequently used for characterizing vocal fold properties, is often difficult to measure. This investigation analyses the lowest pressure initiating vocal fold collision (CTP). Microphone, electroglottograph (EGG), and oral pressure signals were recorded, before and after vocal warm-up, in 15 amateur singers, repeating the syllable /pa:/ ...
Lev Shaul - - 2009
Automated mapping of lung sound distribution is a novel area of interest currently investigated in mechanically ventilated, critically ill patients. The objective of the present study was to assess changes in thoracic sound distribution resulting from changes in positive end-expiratory pressure (PEEP). Repeatability of automated lung sound measurements was also ...
Worsfold Paul P University of Chichester , Chichester, West Sussex, - - 2009
This study assessed human kinetics in relation to golf shoe outer sole design features during the golf swing using a driver club by measuring both within the shoe, and beneath the shoe at the natural grass interface. Three different shoes were assessed: metal 7- spike shoe, alternative 7-spike shoe, and ...
Nakajima Hideko Heidi - - 2009
We present the first simultaneous sound pressure measurements in scala vestibuli and scala tympani of the cochlea in human cadaveric temporal bones. The technique we employ, which exploits microscale fiberoptic pressure sensors, enables the study of differential sound pressure at the cochlear base. This differential pressure is the input to ...
Deguchi Shinji - - 2008
OBJECTIVES: The effect of artificially altered transglottal pressures on the voice fundamental frequency (F0) is known to be associated with vocal fold stiffness. Its measurement, though useful as a potential diagnostic tool for noncontact assessment of vocal fold stiffness, often requires manual and painstaking determination of an unstable F0 of ...
Nilsson Mats E - - 2008
A common indicator of effectiveness for roadside noise barriers is the reduction in A-weighted sound pressure level (L(A)). The present experimental study considered alternative indicators using an annoyance-reduction criterion. A large number of 8 s experimental sounds were created from binaural recordings conducted at various distances from a highway at ...
Reidenberg Joy S - - 2008
This overview assesses some distinguishing features of the cetacean (whale, dolphin, porpoise) air sac system that may relate to the anatomy and function of the paranasal sinuses in terrestrial mammals. The cetacean respiratory tract has been modified through evolution to accommodate living in water. Lack of paranasal sinuses in modern ...
Lane Liane Wardlow - - 2008
To what extent do speaker-external communicative pressures versus speaker-internal cognitive pressures affect utterance form? Four experiments measured speakers' references to privately known (i.e., privileged) objects when naming mutually known (i.e., common ground) objects. Although speaker-external communicative pressures demanded that speakers avoid references to privileged objects, 2 experiments showed that speakers ...
Ward Andrew - - 2008
The attentional myopia model of behavioral control [Mann and Ward, 2007] was tested in an experiment investigating the relationship between physiological arousal and aggression. Drawing on previous work linking arousal and narrowed attentional focus, the model predicts that arousal will lead to behavior that is relatively disinhibited in situations in ...
Wilga Cheryl D - - 2008
After the divergence of chondrichthyans and teleostomes, the structure of the feeding apparatus also diverged leading to alterations in the suction mechanism. In this study we investigated the mechanism for suction generation during feeding in white-spotted bamboo sharks, Chiloscyllium plagiosum and compared it with that in teleosts. The internal movement ...
Bonness William - - 2008
Fluid-structure interaction experiments typically involve measurements of the excitation force (or pressure) and the corresponding vibration response to the excitation. In addition to desired flow information, measured turbulent boundary layer wall pressure data often include unwanted signals such as acoustic pressures and vibration induced pressures. Measured vibration data on a ...
Braasch Jonas - - 2008
The complex polyphonic nature of music typically has stricter requirements for sound-pressure level calibration than back-and-forth natured speech dialogs. An onsite sound engineer typically controls the levels for electroacoustically enhanced music performances. In telematic applications, however, this task can easily become difficult because the sound engineer only has restricted access ...
Nobile Matthew - - 2008
The noise levels in modern high-density data centers are encroaching on occupational noise limits, such as those set by OSHA laws in the United States or EC Directives in Europe. This is surprising to many because the high-tech computer data center is not usually thought of as a workplace that ...
Mihaescu Mihai - - 2008
Unsteady flow simulations in diffuserlike vocal-fold models proved that laryngeal airflow generates vortical structures in the intraglottal region. However, the features of these vortices and their influence on the vocal-fold motion were not clearly addressed. The present work characterizes the intraglottal vortical structures developed during the closing phase of the ...
Twardella Dorothee - - 2008
While no legal rules or regulations exist in Germany, voluntary measures were introduced to achieve a reduction of sound pressure levels in discotheques to levels below 100 dB(A). To evaluate the current levels in Bavarian discotheques and to find out whether these voluntary measures ensured compliance with the recommended limits, ...
Zuckerwar Allan J - - 2008
Calibration of the pressure sensitivity of measurement microphones in a coupler requires by definition that the incident pressure be uniform over the surface of the microphone diaphragm. This requirement is readily satisfied at frequencies up to the cut in frequencies of the radial modes and, if the microphone is not ...
Riner Joshua - - 2008
An acoustic method to check the validity of Hertz's law and assess the actual collision force law in granular media is proposed. The technique uses a microphone to detect the sound produced by collisions between solid polypropylene balls. The impact is observed to produce an underpressure followed by an overpressure. ...
Ludwigsen Daniel - - 2008
The end correction that accounts for the inertial impedance at the open end of a pipe is a widely used refinement to lumped-element models, and many variations have been investigated. This study measures the end correction for 1 m closed-open pipes of varying diameters, exposed to a single-frequency external sound ...
Tack Johannes W - - 2008
BACKGROUND: A newly developed artificial voice source was clinically evaluated in laryngectomized women for voice quality improvements. The prosthesis was placed in a commercially available, tracheoesophageal shunt valve. METHODS: In 17 subjects, voice-producing element (VPE) prototypes were compared with the subject's regular tracheo-esophageal shunt voice in a randomized cross-over trial. ...
Chone Carlos Takahiro - - 2008
OBJECTIVE: To evaluate the utility of computerized manometry (CM) to identify pharyngoesophageal segment (PES) spasm during tracheoesophageal speech. STUDY DESIGN: Prospective clinical, controlled study. SUBJECTS AND METHODS: Intraluminal pressures of the PES were collected in 12 tracheoesophageal speakers without spasm and 8 tracheoesophageal speakers with PES spasm before and after ...
da Costa-Goncalves Andrey C - - 2008
Spinophilin controls intensity/duration of G protein-coupled receptor signaling and thereby influences synaptic activity. We hypothesize that spinophilin affects blood pressure through central mechanisms. We measured blood pressure and heart rate in SPL-deficient (SPL(-/-)), heterozygous SPL-deficient (SPL(+/-)), and wild-type (SPL(+/+)) mice by telemetry combined with fast Fourier transformation. We also assessed ...
Alipour Fariborz - - 2009
To determine the aerodynamic and acoustic effects due to a sudden change from chest to falsetto register or vice versa. It was hypothesized that the continuous change in subglottal pressure and flow rate alone (pressure-flow sweep [PFS]) can trigger a mode change in the canine larynx. Ten canine larynges were ...
Park Jong Beom - - 2008
The influence of a posterior gap on the airflow through the human glottis was investigated using a driven synthetic model. Instantaneous orifice discharge coefficient of a glottal shaped orifice was obtained from the time-varying orifice area and the velocity distribution of the pulsated jet measured on the axial plane using ...
Jiang Jack J - - 2008
Vocal fold vibration is associated with four distinct vibratory patterns: those of the right-upper, right-lower, left-upper, and left-lower vocal fold lips. The purpose of this study was to propose a least squares method to quantify the vibratory properties of each of the four vocal fold lips via videokymography (VKG). This ...
Hatch Leila - - 2008
In 2006, we used the U.S. Coast Guard's Automatic Identification System (AIS) to describe patterns of large commercial ship traffic within a U.S. National Marine Sanctuary located off the coast of Massachusetts. We found that 541 large commercial vessels transited the greater sanctuary 3413 times during the year. Cargo ships, ...
Perincek Seher - - 2009
Design requirements for industrial size ultrasound bath for textile treatments have been determined. For this purpose, effects of sound pressure level, bath temperature, bath volume, textile material type and hydrophility degree of fabric were examined extensively. Finite element analysis (FEA) was used to investigate spacing and alignment of the ultrasound ...
Hoffman Matthew R - - 2009
Current noninvasive measurement of subglottal pressure using airflow interruption often produces inconsistent results due to the elicitation of audio-laryngeal reflexes. Auditory feedback could be considered as a means of ensuring measurement accuracy and precision. The purpose of this study was to determine if auditory masking could be used with the ...
Fulcher Lewis P - - 2010
An experimental study of the pressure distributions in an asymmetric larynx, hereafter referred to as a hemilarynx, was carried out at a glottal diameter of 0.04 cm and transglottal pressures of 3, 5, 10, 20, and 40 cm H(2)O. In each case, the glottal wall "on the left" was chosen ...
Chang C H - - 2008
Compared to single-pressure models, multipressure multiphase flow models require additional closure relations to determine the individual pressures of the different phases. These relations are often taken to be evolution equations for the volume fractions. We present a rigorous theoretical framework for constructing such equations for compressible multiphase mixtures in terms ...
Alipour Fariborz - - 2008
The purpose of this study was to examine the phonatory characteristics of pig, sheep, and cow excised larynges and to find out which of these animal species is the best model for human phonation. Excised pig, sheep, and cow larynges were prepared and mounted over a tapered tube on the ...
Yagi Saiko - - 2008
Swallowing is a reflex that receives sensory information from the peripheral nerves and from the cerebral cortex. The aim of the present study was to investigate whether the sensory input from anterior teeth affects the functional characteristics of tongue pressure applied against the hard palate during swallowing. Subjects were eight ...
Pierucci Mauro - - 2008
Ride quality in an elevator is the latest "hot topic" in elevator design and construction. In skyscrapers being built in Asia, Dubai and the US, the new elevators travel close to and beyond 10ms. The rides to the highest floors will last well over one minute. From a comfort point ...
Zhang Zhaoyan - - 2008
The influence of the body and cover stiffnesses on phonation onset and the resulting vibration pattern was investigated in a body-cover continuum model of the vocal folds. An eigenvalue analysis was performed to obtained phonation onset characteristics. The analysis showed that, with increasing body-cover stiffness ratio, both the phonation threshold ...
Barney Anna - - 2008
A physical model, built to investigate the aeroacoustic properties of voiced fricative speech, was used to study the amplitude modulation of theturbulence noise it generated. The amplitude and fundamental frequency of glottal vibration, relative positions of the constriction and obstacle, and the flow rate were varied. Measurements were made from ...
Sygulska Anna - - 2008
The paper concerns the influence of the stage layout on the acoustic properties of the auditorium of the Grand Theatre in Poznan. An experimental investigation and a numerical calculation were carried out. During the experimental investigation three cases were analyzed. Firstly, the stage was prepared for a concert (acoustical shell), ...
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