keyword
MENU ▼
Read by QxMD icon Read
search

Sound pressure level

keyword
https://www.readbyqxmd.com/read/28329261/effects-of-noise-on-vascular-function-oxidative-stress-and-inflammation-mechanistic-insight-from-studies-in-mice
#1
Thomas Münzel, Andreas Daiber, Sebastian Steven, Lan P Tran, Elisabeth Ullmann, Sabine Kossmann, Frank P Schmidt, Matthias Oelze, Ning Xia, Huige Li, Antonio Pinto, Philipp Wild, Kai Pies, Erwin R Schmidt, Steffen Rapp, Swenja Kröller-Schön
Aims: Epidemiological studies indicate that traffic noise increases the incidence of coronary artery disease, hypertension and stroke. The underlying mechanisms remain largely unknown. Field studies with nighttime noise exposure demonstrate that aircraft noise leads to vascular dysfunction, which is markedly improved by vitamin C, suggesting a key role of oxidative stress in causing this phenomenon. Methods and results: We developed a novel animal model to study the vascular consequences of aircraft noise exposure...
February 17, 2017: European Heart Journal
https://www.readbyqxmd.com/read/28327081/pilot-study-of-patron-sound-level-exposure-in-loud-restaurants-bars-and-clubs-in-new-york-city
#2
Ariel Spira-Cohen, Anna Caffarelli, Lawrence Fung
Visiting restaurants, bars, clubs and lounges is a regular part of urban cultural life for residents and tourists alike; however, anecdotal reports and diner surveys suggest that sound levels are excessive and diners dislike them. High sound levels in these venues can contribute to both patron and employee overexposure, and young people may be particularly at risk. To supplement the paucity of literature and data on noise in urban venues, patron noise exposure was measured inside a sample of loud New York City (NYC) restaurants, bars, clubs and lounges...
March 22, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/28318886/airway-inflammation-phenotype-prediction-in-asthma-patients-using-lung-sound-analysis-with-fractional-exhaled-nitric-oxide
#3
Terufumi Shimoda, Yasushi Obase, Yukio Nagasaka, Hiroshi Nakano, Reiko Kishikawa, Tomoaki Iwanaga
BACKGROUND: We previously reported the results of lung sound analysis in patients with bronchial asthma and demonstrated that the exhalation-to-inhalation sound pressure ratio in the low frequency range between 100 and 200 Hz (E/I LF) was correlated with the presence of airway inflammation and airway obstruction. We classified asthma patients by airway inflammation phenotype using the induced sputum eosinophil and neutrophil ratio and determined whether this phenotype could be predicted using E/I LF and fractional exhaled nitric oxide values...
March 16, 2017: Allergology International: Official Journal of the Japanese Society of Allergology
https://www.readbyqxmd.com/read/28298611/frequency-tuning-and-directional-sensitivity-of-tympanal-vibrations-in-the-field-cricket-gryllus-bimaculatus
#4
Martin J Lankheet, Uroš Cerkvenik, Ole N Larsen, Johan L van Leeuwen
Female field crickets use phonotaxis to locate males by their calling song. Male song production and female behavioural sensitivity form a pair of matched frequency filters, which in Gryllus bimaculatus are tuned to a frequency of about 4.7 kHz. Directional sensitivity is supported by an elaborate system of acoustic tracheae, which make the ears function as pressure difference receivers. As a result, phase differences between left and right sound inputs are transformed into vibration amplitude differences. Here we critically tested the hypothesis that acoustic properties of internal transmissions play a major role in tuning directional sensitivity to the calling song frequency, by measuring tympanal vibrations as a function of sound direction and frequency...
March 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28289557/acoustic-monitoring-indicates-a-correlation-between-calling-and-spawning-in-captive-spotted-seatrout-cynoscion-nebulosus
#5
Eric W Montie, Matt Hoover, Christopher Kehrer, Justin Yost, Karl Brenkert, Tim O'Donnell, Michael R Denson
BACKGROUND: Fish sound production is widespread throughout many families. Territorial displays and courtship are the most common reasons for fish sound production. Yet, there is still some questions on how acoustic signaling and reproduction are correlated in many sound-producing species. In the present study, our aim was to determine if a quantitative relationship exists between calling and egg deposition in captive spotted seatrout (Cynoscion nebulosus). This type of data is essential if passive acoustics is to be used to identify spawning aggregations over large spatial scales and monitor reproductive activity over annual and decadal timeframes...
2017: PeerJ
https://www.readbyqxmd.com/read/28287931/assessment-and-characterization-of-sound-pressure-levels-in-portuguese-neonatal-intensive-care-units
#6
Joana Santos, Carlos Carvalhais, Ana Xavier, Manuela V Silva
In NICU, systematic exposure to sound pressure levels above the recommended can affect both neonates and staff. This study aimed to evaluate the sound pressure levels in three Portuguese NICU and the noise perception of staff. The measurements were performed with a sound level meter, considering the location of the main sources of noise and the layout of the units. A questionnaire was applied to assess noise perception of professionals. The staff classified the environment (regarding noise) as "slightly uncomfortable" (41...
March 13, 2017: Archives of Environmental & Occupational Health
https://www.readbyqxmd.com/read/28285747/effect-of-the-ventricular-folds-in-a-synthetic-larynx-model
#7
Stefan Kniesburges, Veronika Birk, Alexander Lodermeyer, Anne Schützenberger, Christopher Bohr, Stefan Becker
Within the human larynx, the ventricular folds serve primarily as a protecting valve during swallowing. They are located directly above the sound-generating vocal folds. During normal phonation, the ventricular folds are passive structures that are not excited to periodical oscillations. However, the impact of the ventricular folds on the phonation process has not yet been finally clarified. An experimental synthetic human larynx model was used to investigate the effect of the ventricular folds on the phonation process...
February 28, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28280753/mouse-auditory-brainstem-response-testing
#8
Omar Akil, A E Oursler, Kevin Fan, Lawrence R Lustig
The auditory brainstem response (ABR) test provides information about the inner ear (cochlea) and the central pathways for hearing. The ABR reflects the electrical responses of both the cochlear ganglion neurons and the nuclei of the central auditory pathway to sound stimulation (Zhou et al., 2006; Burkard et al., 2007). The ABR contains 5 identifiable wave forms, labeled as I-V. Wave I represents the summated response from the spiral ganglion and auditory nerve while waves II-V represent responses from the ascending auditory pathway...
March 20, 2016: Bio-protocol
https://www.readbyqxmd.com/read/28269324/a-simulation-analysis-of-the-variability-of-the-roving-level-hearing-test
#9
Greg D Watkins, Brett A Swanson, Gregg J Suaning
In the study of auditory prostheses, the Speech Recognition Threshold (SRT) is the Signal to Noise Ratio (SNR) at which 50% of words are correctly identified. SRT is typically measured using an adaptive procedure wherein speech is presented at a fixed sound pressure level (SPL) and the noise level is varied according to the subject's responses. A roving level SRT test has been used by researchers with the goal of including the effectiveness of Automatic Gain Control (AGC) systems in SRT measurements. The roving method presents speech at three different SPLs with the level for each sentence chosen pseudo-randomly, while adaptively varying the SNR...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268130/curbing-the-metallic-mode-in-between-an-empirical-study-qualifying-and-categorizing-restrained-sounds-known-as-curbing-based-on-audio-perception-laryngostroboscopic-imaging-acoustics-ltas-and-egg
#10
Mathias Aaen Thuesen, Julian McGlashan, Cathrine Sadolin
OBJECTIVES: This study aims to study the categorization Curbing from the pedagogical method Complete Vocal Technique as a reduced metallic mode compared with the full metallic modes Overdrive and Edge by means of audio perception, laryngostroboscopic imaging, acoustics, long-term average spectrum (LTAS), and electroglottography (EGG). METHODS: Twenty singers were recorded singing sustained vowels in a restrained character known as Curbing. Two studies were performed: (1) laryngostroboscopic examination using a videonasoendoscopic camera system and the Laryngostrobe program; and (2) simultaneous recording of EGG and acoustic signals using Speech Studio...
March 3, 2017: Journal of Voice: Official Journal of the Voice Foundation
https://www.readbyqxmd.com/read/28265027/sound-propagation-from-a-ridge-wind-turbine-across-a-valley
#11
Timothy Van Renterghem
Sound propagation outdoors can be strongly affected by ground topography. The existence of hills and valleys between a source and receiver can lead to the shielding or focusing of sound waves. Such effects can result in significant variations in received sound levels. In addition, wind speed and air temperature gradients in the atmospheric boundary layer also play an important role. All of the foregoing factors can become especially important for the case of wind turbines located on a ridge overlooking a valley...
April 13, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28260833/development-of-noise-controls-for-longwall-shearer-cutting-drums
#12
Hugo E Camargo, Amanda S Azman, Lynn Alcorn
Noise-induced hearing loss is the second most pervasive disease in the mining industry. The exposure of miners to noise levels above the permissible exposure level results in hearing loss of approximately 80% of coal miners by retirement age. In addition, between 2002 and 2011, approximately 48% of longwall shearer operators were overexposed in coal mines in the United States. Previous research identified the two rotating cutting drums used by the longwall shearer to extract coal as the most significant sound-radiating components...
September 1, 2016: Noise Control Engineering Journal
https://www.readbyqxmd.com/read/28253675/fluctuations-of-the-peak-pressure-level-of-man-made-impulsive-sound-signals-propagating-in-the-ocean
#13
Marta Galindo-Romero, Alexander Gavrilov, Alec J Duncan
The theory of wave propagation and fluctuations in random media has been broadly studied; however the works studying the influence of a changing underwater acoustic environment on the spatial decay and fluctuations of the peak pressure in broadband and impulsive signals are limited. Using a method based on the formulation developed by Dyer and Makris to estimate intensity fluctuations of sound signals in the ocean in conditions of saturated multipath propagation, this paper presents an approach to model peak pressure fluctuations of transient signals propagating underwater...
February 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28253649/compensating-the-distortion-of-micro-speakers-in-a-closed-box-with-consideration-of-nonlinear-mechanical-resistance
#14
Yuxiang Hu, Min Wang, Jing Lu, Xiaojun Qiu
For micro-speakers in a closed box, commonly used nonlinear compensation methods only compensate the distortion caused by the force factor and the stiffness. In this letter, a method to compensate the distortion with consideration of the nonlinear mechanical resistance is proposed based on the feedback linearization criterion. The proposed method is further improved by minimizing the variation of the output power spectrum after compensation. The simulations and experiments show that the total harmonic distortion and the intermodulation distortion of the sound pressure can be reduced significantly with little influence on the sound pressure level...
February 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28253647/prediction-of-jet-mixing-noise-with-lighthill-s-acoustic-analogy-and-geometrical-acoustics
#15
Carlos R S Ilário, Mahdi Azarpeyvand, Victor Rosa, Rod H Self, Júlio R Meneghini
A computational aeroacoustics prediction tool based on the application of Lighthill's theory is presented to compute noise from subsonic turbulent jets. The sources of sound are modeled by expressing Lighthill's source term as two-point correlations of the velocity fluctuations and the sound refraction effects are taken into account by a ray tracing methodology. Both the source and refraction models use the flow information collected from a solution of the Reynolds Averaged Navier-Stokes equations with a standard k-epsilon turbulence model...
February 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28253642/reference-equivalent-threshold-sound-pressure-levels-for-apple-earpods
#16
Cheng-Yu Ho, Pei-Chun Li, Shuenn-Tsong Young
Reference equivalent threshold sound pressure levels (RETSPLs) are used when calibrating audiometric equipment to a hearing threshold level of zero at various frequencies. To the best of the authors' knowledge, the RETSPLs for Apple EarPods (MB770G) have not been reported, and so this study aimed to measure them. The hearing thresholds of 36 normal-hearing subjects (72 ears) were measured at 250, 500, 1000, 2000, 4000, and 8000 Hz, with the measurements being performed twice in 33 subjects (66 ears) for evaluating the test-retest reliability...
February 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28252033/acoustophoretic-separation-of-airborne-millimeter-size-particles-by-a-fresnel-lens
#17
Ahmet Cicek, Nurettin Korozlu, Olgun Adem Kaya, Bulent Ulug
We numerically demonstrate acoustophoretic separation of spherical solid particles in air by means of an acoustic Fresnel lens. Beside gravitational and drag forces, freely-falling millimeter-size particles experience large acoustic radiation forces around the focus of the lens, where interplay of forces lead to differentiation of particle trajectories with respect to either size or material properties. Due to the strong acoustic field at the focus, radiation force can divert particles with source intensities significantly smaller than those required for acoustic levitation in a standing field...
March 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28241225/laryngeal-aerodynamics-in-healthy-older-adults-and-adults-with-parkinson-s-disease
#18
Deborah Matheron, Elaine T Stathopoulos, Jessica E Huber, Joan E Sussman
Purpose: The present study compared laryngeal aerodynamic function of healthy older adults (HOA) to adults with Parkinson's disease (PD) while speaking at a comfortable and increased vocal intensity. Method: Laryngeal aerodynamic measures (subglottal pressure, peak-to-peak flow, minimum flow, and open quotient [OQ]) were compared between HOAs and individuals with PD who had a diagnosis of hypophonia. Increased vocal intensity was elicited via monaurally presented multitalker background noise...
March 1, 2017: Journal of Speech, Language, and Hearing Research: JSLHR
https://www.readbyqxmd.com/read/28229115/data-on-the-auditory-duration-mismatch-negativity-for-different-sound-pressure-levels-and-visual-perceptual-loads
#19
Stefan Wiens, Malina Szychowska, Rasmus Eklund, Mats E Nilsson
The data presented in this article are related to our research article entitled "Effects of sound pressure level and visual perceptual load on the auditory mismatch negativity" (M. Szychowska, R. Eklund, M.E. Nilsson, S. Wiens, 2016) [1]. The duration MMN was recorded at three sound pressure levels (SPLs) during two levels of visual perceptual load. In an oddball paradigm (standard=75 ms, deviant=30 ms, within-subjects design), participants were presented with tones at 56, 66, or 76 dB SPL (between-subjects design)...
April 2017: Data in Brief
https://www.readbyqxmd.com/read/28227565/a-simulation-analysis-of-the-variability-of-the-roving-level-hearing-test
#20
Greg D Watkins, Brett A Swanson, Gregg J Suaning, Greg D Watkins, Brett A Swanson, Gregg J Suaning, Greg D Watkins, Brett A Swanson, Gregg J Suaning
In the study of auditory prostheses, the Speech Recognition Threshold (SRT) is the Signal to Noise Ratio (SNR) at which 50% of words are correctly identified. SRT is typically measured using an adaptive procedure wherein speech is presented at a fixed sound pressure level (SPL) and the noise level is varied according to the subject's responses. A roving level SRT test has been used by researchers with the goal of including the effectiveness of Automatic Gain Control (AGC) systems in SRT measurements. The roving method presents speech at three different SPLs with the level for each sentence chosen pseudo-randomly, while adaptively varying the SNR...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
keyword
keyword
12065
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"