TY - JOUR. T1 - Efficacy of acoustic reflectometry in detecting middle ear effusion. AU - Avery, Christine A.. AU - Gates, George A.. AU - Prihoda, Thomas J.. PY - 1986/9. Y1 - 1986/9. N2 - The acoustic otoscope measures the amount of sound reflected from the tympanic membrane. Since the amount of reflected sound is increased by fluid in the middle ear, it seemed likely that the acoustic otoscope could be used for detection of otitis media. We compared acoustic reflectometry with over 4,000 tympanometric and otoscopic examinations in 451 children who were examined at regular intervals following surgery for chronic otitis media with effusion. The data indicate a lower sensitivity and specificity of acoustic reflectometry than had been reported previously. The receiver-operator characteristics of this device are discussed.. AB - The acoustic otoscope measures the amount of sound reflected from the tympanic membrane. Since the amount of reflected sound is increased by fluid in the middle ear, it ...
The current study demonstrates that MCA, determined by acoustic pharyngometry, can significantly differentiate between those with mild/no-OSA versus moderate-to-severe OSA. When analyzed alongside other variables such as gender, age, and neck circumference, acoustic pharyngometry was the only independent predictor of detecting the absence of moderate-to-severe OSA. This easily obtained measurement thus has potential utility as a component in a diagnostic algorithm for OSA. With healthcare reform, sleep testing may become less readily available, making decisions to prioritize testing in certain patients important.. Acoustic pharyngometry may also be a useful objective tool in occupational health clinics. The population in certain environments may minimize subjective symptoms in sleep questionnaires, leading to the need for simple and cost-effective tools for objective assessments. In conjunction with basic anthropometric characteristics, pharyngometry can help objectively determine those at high ...
Looking for average acoustic output? Find out information about average acoustic output. Vibratory energy output of a transducer measured by a radiation pressure balance; expressed in terms of watts per unit area of the transducer face Explanation of average acoustic output
A non-destructive and novel in situ acoustic sensor approach based on the sound absorption spectra was developed for identifying and classifying different seed types. The absorption coefficient spectra were determined by using the impedance tube measurement method. Subsequently, a multivariate statistical analysis, i.e., principal component analysis (PCA), was performed as a way to generate a classification of the seeds based on the soft independent modelling of class analogy (SIMCA) method. The results show that the sound absorption coefficient spectra of different seed types present characteristic patterns which are highly dependent on seed size and shape. In general, seed particle size and sphericity were inversely related with the absorption coefficient. PCA presented reliable grouping capabilities within the diverse seed types, since the 95% of the total spectral variance was described by the first two principal components. Furthermore, the SIMCA classification model based on the absorption spectra
TY - GEN. T1 - Immobilization of Antibodies and Proteins for the Application in Acoustic Sensors (translated title). T2 - Diploma Thesis, Universität Heidelberg. AU - Schwarz, A. AU - Ros, Alexandra. N1 - Type: Thesis. PY - 1995. Y1 - 1995. M3 - Other contribution. ER - ...
Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published ...
Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published ...
Purpose: To measure the acoustic signal generated by a pulsed proton spill from a hospital-based clinical cyclotron. Methods: An electronic function generator modulated the IBA C230 isochronous cyclotron to create a pulsed proton beam. The acoustic emissions generated by the proton beam were measured in water using a hydrophone. The acoustic measurements were repeated with increasing proton current and increasing distance between detector and beam. Results: The cyclotron generated proton spills with rise times of 18 μs and a maximum measured instantaneous proton current of 790 nA. Acoustic emissions generated by the proton energy deposition were measured to be on the order of mPa. The origin of the acoustic wave was identified as the proton beam based on the correlation between acoustic emission arrival time and distance between the hydrophone and proton beam. The acoustic frequency spectrum peaked at 10 kHz, and the acoustic pressure amplitude increased monotonically with increasing proton ...
Examples of calculating a minimum pipe wall to determine a pipe wall failure probability are disclosed. In one example implementation according to aspects of the present disclosure, a first acoustical sensor is connected to a pipe a distance from a second acoustical sensor connected to the pipe. A computing system is communicatively coupleable to the first and second acoustical sensors. The computing system calculates an average maximum pit depth value of a plurality of pits in an outer surface of a pipe wall of the pipe from a known initial pipe wall thickness value and an average present pipe wall thickness value. The computing system also calculates a minimum present pipe wall thickness by applying a statistical technique to the calculated average maximum pit depth value. The computing system determines a pipe wall failure probability based at least in part on the minimum present pipe wall thickness value.
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These are measured acoustic pressure fields. (a) The incident pressure field at 0 ms. (b)�(d) The scattered pressure fields at 1.8 ms from the soft plane (b), the soft target (c), and the cloaked soft target (d), respectively.
AMS - Acoustic Measurement System. Looking for abbreviations of AMS? It is Acoustic Measurement System. Acoustic Measurement System listed as AMS
Disclosed is a sonic well tool for performing acoustic investigations of subsurface geological formations penetrated by a borehole. The well tool generally includes a longitudinally extending body for positioning in said borehole. The tool also includes a transmitter supported by the body for transmitting acoustic energy, and a receiver supported by the body for receiving acoustic energy. Finally, the tool includes an acoustic attenuation section positioned on the body between the transmitter and the receiver. This section includes one or more cavities defined by the body, inertial mass members positioned inside the cavities in a suitable manner to form a gap between the wall of the cavity and the inertial mass members, and an acoustical attenuation fluid in the gap. The method for attenuating sonic waves generally includes transmitting a sonic wave from the transmitter to the tool, passing the sonic wave through the acoustic attenuation section, and receiving attenuated wave at the receivers.
Testing for ovarian cancer or the presence of a particular chemical could be almost as simple as distinguishing an F sharp from a B flat, thanks to a new microscopic acoustic device that has been dramatically improved by scientists at the U.S. Department of Energys (DOE) Argonne National Laboratory.. The device, known as a surface acoustic wave (SAW) sensor, detects frequency changes in waves that propagate through its crystalline structure. This makes it ideal for detecting the presence of chemicals or biomarkers present in a liquid or gas. For example, it can detect cancer proteins attached to a receptor on the sensor surface.. The initial wave is created by a physical phenomenon known as the piezoelectric effect, in which an initial electric signal is converted into a mechanical displacement. This displacement takes the form of a wave transmitted through the crystal.. In the SAW sensor, the signal travels like a seismic wave from the input transducer through the material to an output ...
Sensing an incoming signal is typically associated with absorbing a portion of its energy, inherently perturbing the measurement and creating reflections and shadows. Here, in contrast, we demonstrate a non-invasive, shadow-free, invisible sensor for airborne sound waves at audible frequencies, which fully absorbs the impinging signal, without at the same time perturbing its own measurement or creating a shadow. This unique sensing device is based on the unusual scattering properties of a parity-time (PT) symmetric metamaterial device formed by a pair of electro-acoustic resonators loaded with suitably tailored non-Foster electrical circuits, constituting the acoustic equivalent of a coherent perfect absorber coupled to a coherent laser. Beyond the specific application to non-invasive sensing, our work broadly demonstrates the unique relevance of PT-symmetric metamaterials for acoustics, loss compensation and extraordinary wave manipulation.. ...
This unit introduces the fundamental concepts and issues of audio and architectural acoustics, with an emphasis on theory. The unit introduces topics such as: basic acoustical concepts, quantities and units; principles of sound radiation and propagation; sound absorption and room acoustics; psychological acoustics; noise measurement and specification; speech intelligibility; and principles and specification of airborne sound insulation. Acoustics theory involves mathematics, and this unit aims to provide knowledge and skills so that such theory can be applied, with the help of spreadsheets and computer programs. Teaching is supported by demonstrations and tutorials. By completing this unit students will be able to understand acoustical terminology, and perform calculations and analysis applicable to sound in the environment, in buildings, and in audio contexts. They will have the ability to critically assess claims of acoustical performance. This unit provides the theoretical foundation for ...
The phenomenon of fatigue in gears at the tooth root can be a cause of catastrophic failure if not detected in time. Where traditional low-frequency vibration may help in detecting a well-developed crack or a completely failed tooth, a system for early detection of the nucleation and initial propagation of a fatigue crack can be of great use in condition monitoring. Acoustic emission is a potentially suitable technique, as it is sensitive to the higher frequencies generated by crack propagation and is not affected by low-frequency noise. In this article, a static gear pair is tested where a crack was initiated at a tooth root. Continuous acoustic emission was periodically recorded throughout the test. Data were processed in multiple ways to support the early detection of crack initiation. Initially, traditional feature-based acoustic emission was employed. This showed qualitative results indicating fracture initiation around 8000 cycles. A rolling cross-correlation was then employed to compare ...
True Acoustics is Complete, Full-Bandwidth Acoustics. No Limitations, No Filters, No EQ. It means designing for and addressing all energy of any kind or frequency which can be perceived by the human ear and the human auditory system: brian, nerves, cochlea, eardrum, earcanal, pinna…... True Acoustics means we can hear greater levels of Clarity, more life-like imagery, increased subtlety of micro-dynamics and finer resolution of detail than ever before. Our sense of hearing has evolved physiologically and cognitively to a level previous generations were unable to achieve. Evolution is systemic, thankfully.. True Acoustics means our biological mechanisms and the electronic world that creates sound have both evolved to new levels of performance, making everything weve done for 100 years antiquated. While this sounds dramatic and shocking, its quite normal for any field of science or for that matter, much of the creative arts and most definitely pop culture. Things change, we evolve and adapt. ...
In 2020, the global Acoustic Emission Equipment market is anticipated to rise at a considerable rate during the forecast period 2021-2027. In 2021, the market is growing at a steady rate and with the rising adoption of strategies by key players, the market is expected to rise over the projected horizon. The Major Players in the Acoustic Emission Equipment Market include : The research covers the current Acoustic Emission Equipment market size of the market and its growth rates based on 5-year records with company outline of key players/manufacturers: ● Acoustic Monitoring International ● Campbell Scientific ● Dodson Technical Services ● Mistras Group ● Parker-Hannifin Corporation ● Schmitt Industries ● Score Atlanta ● Siemens AG ● Vallen Systeme ● Wabtec Corporation The qualitative and quantitative data provided in this study can help decision-makers understand which market segments, regions are expected to grow at higher rates, factors affecting the market, and key ...
Basics of Acoustics: Basics of Acoustics Agenda Basics Acoustics Theory Acoustic Hardware Microphones Analysis and Processing Siemens Solutions Unrestricted Siemens AG Page Siemens PLM Software Agenda Basics Acoustics
Celebrating the signed agreement on 4/1/2016. During the next three months, Daly-Standlee & Associates and Acoustics By Design are rebranding to reflect their merger and expanded services, while continuing operations and serving clients with the same staff from the same locations. The combination of Daly-Standlee & Associates and Acoustics By Design professionals provides a deeper portfolio of services and expertise for clients.. Both offices offer a broad range of acoustical consulting services. The Grand Rapids office adds more extensive audio, video, theatrical lighting, and technical systems expertise to the Portland offices service portfolio. The addition of the Portland office now broadens Acoustics By Designs expertise and experience in the environmental noise and vibration arena. Kerrie G. Standlee, President of Daly-Standlee & Associates, says, The merger with Acoustics By Design provides a nice complement of services for our clients. We will be maintaining our strong presence in ...
EPSRC-sponsored UK Acoustics Network Launch Event is scheduled to take place on the 27th of November 2017 in the Royal Society in London. It is free to register and to attend. We welcome delegates from industry, consultancies, government bodies and academia to participate in and contribute to the formation and future operation of the new Acoustics Network. We particular encourage PhD students and early career staff with interest in acoustics to register and attend this event. This Launch Event will help the wider coordination of acoustics-related research to enable better communication with industry and multiple avenues of research and innovation. This is important to ensure that the quality of the critical mass of the acoustics-related research in the UK continues to stay internationally leading in the foreseeable future.. The UK Acoustics Network (http://gow.epsrc.ac.uk/NGBOViewGrant.aspx?GrantRef=EP/R005001/1) pursues two main aims: (i) transfer new experimental techniques, models and ...
Acoustic output power is adaptively regulated in medical diagnostic ultrasound imaging. Given transmit settings, the acoustic power and/or another setting may be altered to avoid violating a limit set
In Australia, proponents of seismic surveys and other operations emitting underwater noise have to prepare an Environmental Plan (EP) for approval by the regulator before operations can commence. In support of the EP, large amounts of data are often collected, such as baseline data on the marine soundscape, the physical and biological environment, operational noise characteristics etc. More data (on underwater noise, animal abundance and behaviour etc.) is sometimes collected during operations as part of monitoring and mitigation plans. Australias offshore oil & gas industry has recently come together to share data from bioacoustic environmental impact assessments, yielding charts of baseline soundscape characteristics, catalogues of anthropogenic source characteristics, improved models for sound field prediction, and growing databases of animal behaviour, abundance and migration. This data sharing will ultimately help to streamline the environmental approval process.. ...
Acknowledgments xi. Introduction xiii. 1. Basic Theory 1. Sound Level 2. Sound Level 2. Source Path Receiver 4. Measuring Sound Level 5. Measuring Sound Level 8. Multiple Sound Sources 9. Decibel Addition 10. Sound Propagation 11. Sound Propagation 11. Directivity 12. Sound Frequency 13. Frequency 13. Octave Bands 17. Sound Level Perception and Frequency 19. A?]Weighted Decibels 20. The Special Case of Low?]Frequency Sound 22. 2. Sound Absorption 25. Principles of Absorptive and Reflective Surfaces 26. Absorption Coefficient 27. Types of Sound Absorbers 29. Room Constant 33. Room Average Absorption 33. Noise Reduction Coefficient (NRC) 36. Sound Absorption Data 38. 3. Room Acoustics 57. Room Acoustics Qualities 58. Impulse Response 58. Reverberance 60. Optimal Reverberation Time 65. Clarity 66. Variable Acoustics 70. Reverberation Time Calculation Checklist 74. Room Shaping for Speech and Music 75. Loudness 76. Balconies 80. Sightlines 82. Warmth 83. Concert Hall Types 85. Spatial Impression ...
The physiological mechanisms and acoustic principles underlying sound production in primates are important for analyzing and synthesizing primate vocalizations, for determining the range of calls that are physically producible, and for understanding primate communication in the broader comparative context of what is known about communication in other vertebrates. In this paper we discuss what is known about vocal production in nonhuman primates, relying heavily on models from speech and musical acoustics. We first describe the role of the lungs and larynx in generating the sound source, and then discuss the effects of the supralaryngeal vocal tract in modifying this source. We conclude that more research is needed to resolve several important questions about the acoustics of primate calls, including the nature of the vocal tracts contribution to call production. Nonetheless, enough is known to explore the implications of call acoustics for the evolution of primate communication. In particular, ...
The FDA has given Masimo clearance for its new technology for continuous monitoring of the respiration rate in post operative patients. Masimos Rainbow SE
The course will deliver competence in building acoustics for design of buildings and rooms in buildings so that the acoustic environment fulfills the requirements from community and users. Competence should include understanding the effect of noise loads from internal and external sources and the use of theoretical and empirical methods to design buildings with satisfying sound insulation against noise. The student will also develop skills on room acoustics, i.e. develop understanding of how sound spreads in volumes and what it takes to achieve desired sound quality in rooms by using modeling and analysis. Finally, the course will give knowledge of measuring technique for room acoustics and sound insulation. ...
How is Audio, Acoustique et Ondes (French: Audio, Acoustics and Waves) abbreviated? AAO stands for Audio, Acoustique et Ondes (French: Audio, Acoustics and Waves). AAO is defined as Audio, Acoustique et Ondes (French: Audio, Acoustics and Waves) rarely.
Three years after the opening of Manchester based Odd bar and two years after the launch of sister venue -the award winning Odder bar (best bar north and best bar UK 2007-2008) Managing director Cleo Farman took the decision to completely overhaul the existing sound systems of both venues. This move was driven by her frustration with the existing systems which were prone to failure and did not come with 24 hour support, proving critical when high profile DJs such as Mark Ronson are playing. Blacka Acoustics has completed sound, light and AV solutions for many bars, nightclubs and live music venues throughout Manchester, such as; One Central, Ruby lounge, Jabez Clegg and Lounge 31. Blacka Acoustics Craig West related his initial impressions of the venues: The specifications were way under the necessary requirements, and the systems had a variety of problems that were never rectified. He added: The clients main requirements was that support was available; Blacka Acoustics offers venues ...
HEAD acoustics provides noise and vibration, sound quality, and telecommunications voice quality and acoustics testing systems and Aachen head or aachen head binaural recording and playback systems. HEAD acoustics GmbH - Kopfbezogenen Aufnahme- und Wiedergabetechnik, Kommunikations-Messtechnik.
Studio Acoustics then looks at what you can do to improve or enhance the sound of your recording environment. The producers of the series actually constructed a purposed built studio for the making of the program and you get to see the construction process from start to finish including an examination of such things as floating floors, non parallel walls, window double-glazing, lighting, doors, and more.. Although Studio Acoustics takes a thorough look at how sound behaves in a typical recording environment you dont have to be on the point of building your own recording studio to make use of this information. Alan and acoustic team offer a lot of simple practical advice that can be applied to a bedroom or garage recording space.. Finally, Studio Acoustics looks at how best to place your equipment. This is a vitally important subject. Alan shows how monitors should ideally be placed at ear level, in an equilateral triangle between the speakers and yourself. And he tells you why!. Studio ...
Acoustics includes articles relating to the science of sound and how sound works. Check out articles about acoustics on the HowStuffWorks Acoustics Channel.
Eventbrite - Moorgate Acoustics presents Moorgate Acoustics Naim Audio/B&W Streaming Open Day - Saturday, 16 November 2013 at Moorgate Acoustics , Sheffield, South York. Find event and ticket information.
Accessories - Wildlife Acoustics - Wildlife Acoustics Blog - Wildlife Acoustics is the leading provider of bioacoustics monitoring technology for scientists, researchers, and government agencies all over the world. Our customers monitor birds, bats, frogs, insects, fish, whales, elephants, rhinos and many other types of wildlife.
Mike Silverton. [April 1999. Originally appeared in La Folia 1:5.]. Before I learned of Georg Graewes (never George but sometimes Gräwes) Random Acoustics label, Id long enjoyed his participation in a pair of hatART and trio of Music & Arts CDs. But this is not quite accurate. Id already received from the labels American distributor, Cadence / NorthCountry, a Random Acoustics CD, Georg Graewe: Chamber Works 1990-92 [RA 003] without, however, remarking the Produced by Georg Graewe notice on the envelopes backside, thus failing to recognize the pianist-composer under an impresarios hat. It wasnt until later that I chanced upon Random Acoustics intriguing catalog.. One doesnt apply intriguing lightly. If one is alert to the art of his time, he cannot but respond to the seamless absorption of a high cultures avant-garde and jazz into yet another field of activity. Avoiding the term movement, Ill likewise decline from tagging these phenomena Third Stream, as that connects to a ...
The Acoustics Special Interest Group has been formed in accordance with SPWLA bylaws and has been ratified/approved by the committee. The purpose of this SIG is to provide a forum for those interested in borehole acoustics to conduct technical discussions concerning tool design, data acquisition, applications, interpretation, and to develop/promote industry standards. Borehole Acoustics has grown significantly in technology and applications since the early days of monopole wireline tools in the 1960s. There have been design advances in both the wireline and LWD systems allowing for ever-increasing data quality and complexity. Uses of the data have grown from porosity and cement bond logging to include pore pressure prediction, seismic correlation, 3D stress profiling, fracture characterization, production enhancement, permeability, geosteering, and more ...
The Technical Committee on Signal Processing in Acoustics sponsors Gallery of Acoustics competitions at meetings of the Acoustical Society of America (typically one per year). Its purpose is to enhance ASA meetings by providing a setting for researchers to display their work to all meeting attendees in a forum emphasizing the diversity, interdisciplinary, and artistic nature of acoustics. Entries for the Gallery competition can be either video, still image(s), or a poster. A cash prize is given to the winner(s). Meeting attendees vote on their favorite entries. Below are past winning entries of Gallery competitions. Contact Michael Muhlestein (mimuhle***gmail.com) for more information ...
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Since 2004, the acoustics groups at NTNU and SINTEF have cooperated as a Gemini Centre called the Acoustics Research Centre. The purpose of this collaboration is building an acoustics community of even greater size and quality than what can be achieved individually. ...
Learn Introduction to Acoustics (Part 2) from Korea Advanced Institute of Science and Technology(KAIST). Learners might have learned the basic concepts of the acoustics from the Introduction to Acoustics (Part 1). Now it is time to apply to the ...
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Title:Acoustics 2015 Desc:Proceedings of a meeting held 15 October 2015, Harrogate, England. Series:Proceedings of the Institute of Acoustics Volume 37 Pt.2 ISBN:9781510815384 Pages:312 (1 Vol) Format:Softcover TOC:View Table of Contents Publ:Institute of Acoustics ( IOA ) POD Publ:Curran Associates, Inc. ( May 2016 )
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Integration of the microcomputer into acoustic emission instrumentation has brought AE monitoring of fatigue tests into the realm of practicality. On-line processing makes available a selection of software tools, enhancing classical techniques for eliminating the background noise which usually blanked out the desired data. Fatigue tests monitored for acoustic emission were carried out at room temperature on Incoloy 901 material specimens, over a stress-ratio range of −1 ≤ R ≤ .2. Valid AE data were obtained even when the load cycle passed through zero. The AE data permitted specific identification of the various phenomena occurring on the way to final failure. These included initial plasticity, crack nucleation and propagation phases. The AE findings were supported by microscopic examination. Based on the experimental data, a preliminary damage-prediction model was formulated.. ...
TY - JOUR. T1 - Analysis of the damage mechanisms in mixed-mode delamination of laminated composites using acoustic emission data clustering. AU - Fotouhi, Mohamad. AU - Sadeghi, Seyedali. AU - Jalalvand, Meisam. AU - Ahmadi, Mehdi. PY - 2017/3/1. Y1 - 2017/3/1. N2 - In this study, acoustic emission (AE) technique is used to investigate different time-to-failure mechanisms of delamination in glass/epoxy composite laminates. Woven and unidirectional layups were subjected to the double cantilever beam, end notch flexure, and mixed-mode bending tests and the generated AE signals were captured. Discrimination of the AE events, caused by different types of the damage mechanisms, was performed using wavelet packet transform (WPT) and fuzzy clustering method (FCM) associated with a principal component analysis (PCA). The FCM and WPT analyses identified three dominant damage mechanisms. Furthermore, different interface layups and different GII/GT modal ratio values (ratio of mode II strain energy ...
Detection of disseminating tumor cells among patients suffering from various types and stages of cancer can function as an early warning system, alerting the physician of the metastatic spread or recurrence of the disease. Early detection of such cells can result in preventative treatment of the disease, while late stage detection can serve as an indicator of the effectiveness of chemotherapeutics. The prognostic value of exposing disseminating tumor cells poses an urgent need for an efficient, accurate screening method for metastatic cells. We propose a system for the detection of metastatic circulating tumor cells based on the thermoelastic properties of melanoma. The method employs photoacoustic excitation coupled with a detection system capable of determining the presence of disseminating cells within the circulatory system in vitro. Detection trials consisting of tissue phantoms and a human melanoma cell line resulted in a detection threshold of the order of ten individual cells, thus ...
Looking for online definition of acoustic reflectometry in the Medical Dictionary? acoustic reflectometry explanation free. What is acoustic reflectometry? Meaning of acoustic reflectometry medical term. What does acoustic reflectometry mean?
This paper demonstrates an acoustic sensor that can resolve atomic force microscopy (AFM) tip blunting with a frequency sensitivity of 0.007%. The AFM tip is fabricated on a thin film piezoelectric aluminum nitride (AlN) membrane that is excited as a film bulk acoustic resonator (FBAR). We demonstrate that cutting 0.98 μm off of the tip apex results in a resonance frequency change of 0.4MHz at 6.387GHz. This work demonstrates the potential for in-situ monitoring of AFM tip wear.
Urinary bladder fibrosis (thickening and scarring) is fairly uncommon in children. Traditionally, the presence of urinary bladder fibrosis has been confirmed directly with bladder biopsy or using urodynamic testing.. We will use ultrasound ARFI (acoustic radiation force impulse)-derived shear wave velocities to potentially identify the presence of urinary bladder wall fibrosis. We hypothesize that shear wave velocities found within the bladder wall will increase with increasing evidence of fibrosis. ...
BACKGROUND: Transient elastography (TE) is widely used for non-invasive assessment of liver fibrosis in HIV-HCV co-infected patients. TE, however, cannot determine liver morphology. Acoustic radiation force impulse (ARFI) imaging is a novel procedure enabling assessment of liver fibrosis during a conventional ultrasonographic examination. This study evaluated the correlation between liver fibrosis measurements by TE and ARFI. METHODS: Each of 46 HIV-HCV patients underwent both ARFI and TE within 6 months. Patients were evaluated by the equivalent METAVIR scoring system, using previously established cut-off values. Agreements between the ARFI and TE scores were estimated by Kappa coefficients, with Kappa values ≥0.40, ≥0.60, and ≥0.80 defined as moderate, good and very good agreement, respectively. RESULTS: ARFI and TE yielded Equivalent Metavir fibrosis scores of F1 in 26 and 31 patients, respectively; F2 in nine and seven, respectively; F3 in three and two, respectively; and F4 in eight and
A method for reliable, noninvasive estimation of Abdominal Aortic Aneurysms (AAA) wall mechanics may be a useful clinical tool for rupture prediction. An in vitro AAA model was developed from an excised porcine aorta, with elastase treatment. The AAA model behaviour was analysed using Acoustic Radiation Force Impulse (ARFI) imaging techniques to generate displacements in both aneurysmal and normal aortic tissue. The incremental modulus of the arteries was indicative of early collagen recruitment, typical in aneurysms due to elastin degradation. Opening angle measurement showed a four fold decrease from healthy aorta to AAA model. The mechanical changes that occur during aneurysm formation were found to be detectable using ARFI imaging ...
Quantifying Skin Stiffness in Graft-Versus-Host Disease, Morphea, and Systemic Sclerosis Using Acoustic Radiation Force Impulse Imaging and Shear Wave Elastography.
Acoustic radiation force impulse (ARFI) scanning uses a swept focus in transmit. Using a changing delay or phase profile across the array during the generation of the ARFI pulse, a time varying focus
PubMedID: 27452611 | Diagnosis of pre-eclampsia and assessment of severity through examination of the placenta with acoustic radiation force impulse elastography. | International journal of gynaecology and obstetrics : the official organ of the International Federation of Gynaecology and Obstetrics | 10/1/2016
An acoustic wave sensor utilizes one or more acoustic waves trapped in an acoustic wave cavity to detect the presence of one or more substances on a surface of the acoustic wave cavity. To detect the presence of ice, a trapped torsional acoustic wave is used. To detect water, an acoustic wave with flexural or compressional components is used. The sensor includes a number of transducers adjacent the acoustic wave cavity where a controller drives different sets of the transducers to generate different acoustic waves.
The purpose of the International Institute of Acoustics and Vibration (IIAV) is to advance the science of acoustics and vibration by creating an international scientific society that is responsive to the needs of scientists and engineers in all countries whose primary interests are in the fields of acoustics and vibration. The Institute cooperates with scientific societies in all countries and with other international organizations with the aim of increasing information exchange by sponsoring, cosponsoring or supporting seminars, workshops, congresses and publishing journals, newsletters and other publications. The IIAV provides a refereed journal on paper, the International Journal of Acoustics and Vibration (IJAV), electronic newsletter and the International Sound and Vibration Digest (ISVD) for all members as part of their dues. ...
A device for collecting cardiovascular data relating to an individual user, comprising a control unit assembly with an electronic controller and a pneumatic unit, an arm band having an inflatable bladder and configured to surround the left arm of the individual, wherein the pneumatic unit has a pump and a pressure sensor, and is configured to inflate and deflate the inflatable bladder, so that the electronic controller can determine the arterial pressure of the user, the device further comprising an acoustic sensor being coupled to the external wall of the arm band and having a sensitive side such that in use configuration, the sensitive side is adjacent to the chest of the user, whereby at least a cardiovascular timing characteristic can be inferred from signals from the acoustic sensor and the pressure sensor. The device may also comprise a set of contact electrodes to provide additionally ECG functionality.
Concert halls with strong and lateral sound increase the emotional impact of orchestra music. An audiences auditory experience during a thrilling and emotive live symphony concert is an intertwined combination of the music and the acoustic response of the concert hall. Music in itself is known to elicit emotional pleasure, and at best, listening to music may evoke concrete psychophysiological responses. Certain concert halls have gained a reputation for superior acoustics, but despite the continuous research by a multitude of objective and subjective studies on room acoustics, the fundamental reason for the appreciation of some concert halls remains elusive. This study demonstrates that room acousticeffects contribute to the overall emotional experience of a musical performance. In two listening tests, the subjects listen to identical orchestra performances rendered in the acoustics of several concert halls. The emotional excitation during listening is measured in the first experiment, and in ...
Worship Space Acoustics is a unique guide to the design, construction, and use of religious facilities for optimum acoustics. The book is divided into two parts: Part I discusses methods and techniques of room optimization, including how the acoustics of large and small spaces are designed, implemented, and adjusted; how acoustical privacy is attained; noise and its control; sound reinforcement; and numerical and physical modeling techniques. Part II provides the architect, student, and lay person a review of the characteristics of the religious services pertinent to various beliefs and how these are provided for in the acoustic design of spaces in churches, mosques, and synagogues.
Advances in Acoustics and Vibration is a peer-reviewed, Open Access journal that acts as a platform for dissemination of innovative and original research and development work in the area of acoustics and vibration. The target audience of the journal comprises both researchers and practitioners. Articles with innovative works of theoretical and/or experimental nature with research and/or application focus can be considered for publication in the journal. Advances in Acoustics and Vibration page
TY - CONF. T1 - Acoustic detection of diplophonia among other types of dysphonia. AU - Aichinger, Philipp. AU - Schneider-Stickler, Berit. AU - Hagmüller, Martin. AU - Schoentgen, Jean. PY - 2016. Y1 - 2016. M3 - Abstract. ER - ...
The U.S. Army has developed networked acoustic emission sensors designed to scan an H-60 Black Hawk for airframe damage.. The Army said Thursday, Researchers from the U.S. Army Research Laboratory and the U.S. Army Aviation and Missile Research, Development and Engineering Center have developed a technology that can instantly notify flight crew on structural damage upon occurrence.. The effort began around 2015 with the ARLs studies on rotorcraft airframe health monitoring.. Future Army airframe structures are required to be lighter, safer and ultra-reliable, said Mulugeta Haile, research aerospace engineer at the ARL.. To achieve these the Army must adopt a combined strategy of implementing advanced structural design methods, improved structural materials and integrated damage sensing and risk prediction capabilities, he added.. Haile also stated that they chose acoustic emission because other methods including ultrasonic and radiography still require an external energy source which may ...
1. Minchinton AI, Tannock IF. Drug penetration in solid tumours. Nature reviews Cancer. 2006;6:583-92 2. Iyer AK, Khaled G, Fang J, Maeda H. Exploiting the enhanced permeability and retention effect for tumor targeting. Drug discovery today. 2006;11:812-8 3. Li Y, Wang J, Wientjes MG, Au JL. Delivery of nanomedicines to extracellular and intracellular compartments of a solid tumor. Advanced drug delivery reviews. 2012;64:29-39 4. Hobbs SK, Monsky WL, Yuan F, Roberts WG, Griffith L, Torchilin VP. et al. Regulation of transport pathways in tumor vessels: role of tumor type and microenvironment. Proceedings of the National Academy of Sciences of the United States of America. 1998;95:4607-12 5. Matsumura Y, Maeda H. A new concept for macromolecular therapeutics in cancer chemotherapy: mechanism of tumoritropic accumulation of proteins and the antitumor agent smancs. Cancer Res. 1986;46:6387-92 6. Meng H, Xue M, Xia T, Ji Z, Tarn DY, Zink JI. et al. Use of size and a copolymer design feature to ...
HIV positive patients who have liver dysfunction have shown to be correlated with high mortality and morbidity. To date, ARFI elastography has been known to correlate with the degree of liver fibrosis in chronic liver disease. However, ARFI velocity has not yet been reported in HIV patients. The aim of this study was to identify the normal range of ARFI velocity and liver stiffness value by recruiting HIV patients without abnormal liver function and chronic liver disease ...
Underwater acoustics is the study of the propagation of sound in water and the interaction of the mechanical waves that constitute sound with the water and its boundaries. The water may be in the ocean, a lake or a tank. Typical frequencies associated with underwater acoustics are between 10 Hz and 1 MHz. The propagation of sound in the ocean at frequencies lower than 10 Hz is usually not possible without penetrating deep into the seabed, whereas frequencies above 1 MHz are rarely used because they are absorbed very quickly. Underwater acoustics is sometimes known as hydroacoustics. The field of underwater acoustics is closely related to a number of other fields of acoustic study, including sonar, transduction, acoustic signal processing, acoustical oceanography, bioacoustics, and physical acoustics. Underwater sound has probably been used by marine animals for millions of years. The science of underwater acoustics began in 1490, when Leonardo da Vinci wrote the following, If you cause your ...
The technique of measuring surface acoustic wave (SAW) speed of a solid by an acoustic microscope has been known to the nondestructive evaluation (NDE) community for last twenty five years. A number...
There is a significant positive correlation between median velocity measured by using ARFI sonoelastography and severity of liver fibrosis in patients with NAFLD. The results of ARFI sonoelastography were similar to those of transient sonoelastography.
The Journal of Clinical Imaging Science (JCIS) is an open access peer-reviewed journal committed to publishing high-quality articles.
Nelson Acoustics teams with Viacoustics to provide turnkey sound and vibration measurement systems that are powerful yet easy to use, flexible to meet a variety of measurement challenges, extensible, and export data into customizable spreadsheets.. Nelson Acoustics has developed several software packages for materials testing.. To get more information, demonstrations or price quotes, please contact Viacoustics.. Laboratory scale:. Sound Transmission Loss per ASTM E90: Trident. Sound Absorption per ASTM C432: Trident. Bench Scale:. Sound Absorption per ASTM E1050: EZ1050. Sound Transmission loss per ASTM E2611: Contact Viacoustics. Material Damping per ASTM E756 / SAE J1637: Contact Viacoustics. ...
0065]If a lancing, tapping strike or drilling acoustic emission does not exceed the magnitude thresholds, the detection module 310 may not register an acoustic event, but it may keep a record of each acoustic emission. Using an occurrence threshold, the detection module 310 may register a Warning acoustic event if it records five or more lancing, tapping strike or drilling acoustic emissions during a tapping session, regardless of whether they exceed the magnitude threshold. The detection module 310 may register an Alert acoustic event if it records 8 or more lancing, tapping strike or drilling during a tapping session, regardless of whether the acoustic emissions exceed the magnitude threshold. The occurrence thresholds contained within the detection module 310 may also incorporate information from the source location module 320, such that each zone within the tapblock 120 may have an independent occurrence threshold. Even if no single lancing, tapping strike or drilling acoustic emission ...
Premier Designs, a values-based jewelry distribution company, just completed a beautiful atrium for their corporate headquarters in Irving, TX. Designed by Dallas Architectural firm, Good Fulton & Farrell, the atrium space is also intended to be used as a corporate communication area. Electro Acoustics was recommended to develop a solution. Working with Dallas acoustician Bill Johnson of Acoustics Design Associates, the atrium ceiling was designed to absorb excess reverberation, allowing the Tannoy digitally steerable line array speaker system to provide clear speech when speaking during special events and company gatherings. A portable 80-inch LED display is rolled into place for video presentations.. Special care was taken to create solutions that worked with the architectural design to meet communication requirements, while ensuring the speakers were hidden.. ...
Cyber Acoustics CA-2014 Multimedia Speaker System price as low as $14 shop stores & buy Speaker System and find best deals for Cyber Acoustics Speaker System
BABICHacoustics works with business owners, architects, engineers, and city planners to provide environmental noise control solutions in order to meet community noise codes. It is important to complete noise surveys and assessments before a project begins to capture costs of noise control solutions.. Determining the effect that noise from airplanes, rail lines, highways, or industrial plants has on a new facility or neighboring residences is important for improving interior building acoustics and tenant comfort. Designers often overlook noise form exterior equipment such as air handlers, cooling towers, compressors, condensing units, exhaust fans, and emergency generators. It is important for these planners to include an acoustical expert to avoid community noise problems.. Copyright © 2017 Babich Acoustics LLC, All rights reserved. ...
Composite Acoustics (CA) guitars grew from an idea by a former aerospace engineer and guitar aficionado to make acoustic guitars using composites instead of wood. Having developed composite materials that could reproduce the sound characteristics of the wood instruments, C.A.s initial pursuit as a company was to offer their proprietary technology to existing guitar manufacturers who had the capacity to build the next generation of acoustic instruments. Despite the recognition that great tone woods are becoming alarmingly scarce CA found that existing manufacturers were slow to adopt new materials due in part to their existing investment in wood stocks and related wood working equipment. At this point CA determined to build composite guitars themselves, introducing a series of carbon fiber acoustic guitars in the early 2000s.. By early 2010, however, CA had ceased production. Peavey Electronics Corporation purchased CA in late 2010 and re-launched the brand in 2011. Composite Acoustics are proud ...
Auralex Acoustics is the industry leader in acoustical treatment products, including acoustical absorbers, diffusors, sound barriers, construction materials, isolation platforms and complete room treatment systems. Let the experts at Auralex help you achieve world-class acoustics in any room.
Auralex Acoustics is the industry leader in acoustical treatment products, including acoustical absorbers, diffusors, sound barriers, construction materials, isolation platforms and complete room treatment systems. Let the experts at Auralex help you achieve world-class acoustics in any room.
BLAST is a software to predict ballistic acoustics parameters. Obtain valuable evidence data from the sound of a gunshot. It is the ideal tool for forensics, researchers and law enforcement officers related to the gunshots acoustics field.
Avalon Acoustics Compass for sale. For sale a really nice pair of Avalon Acoustic Compas speakers. These are brand new and in very good condition both functionally and cosmetically. Detail: Driver Complement: - 1inch Concave ceramic...
Zaryadye Concert Hall is located on the the south-east corner of Zaryadye Park in central Moscow, along the Moskva river and just a stone-throw away from the Kremlin compound and the Red Square. Design started in 2015 and construction was completed in August 2018. Moscow-based TPO Reserve served as principal designer for the building and halls, with Nagata Acoustics providing consulting services for the room acoustical design of the two concert halls of the venue: the 1560-seat Large Hall, dedicated to orchestral programs in natural acoustics, and the 400-seat Small Hall designed for recital and chamber music as well as orchestra rehearsals.. The Large Hall exhibits an vineyard-type layout, with a wide parterre divided by tilted walls and a terrace seating warping around the stage and rising toward the rear of the hall to create a balcony. The hall offers a large stage suitable for full- size orchestra which can be extended upstage by a fully retractable choir seating block. The front of the ...
Architecture and interior design both affect and are affected by a diversity of factors that one might not give much thought to, despite being very much influenced by them. Light, materials, and colors are among, if not the only obvious factors that immediately come to mind; a highly significant factor that does not, yet has tremendous effect on the functionality of any building, is acoustics.. Having had the opportunity to travel quite a bit over the past couple of decades, I have had a diversity of experiences with hotel rooms, as well as entertainment theaters. In both cases, the role of acoustics has been quite evident to me. In the first, more personal experience, I noticed that the higher the level of the accommodation I experienced, the quieter my room was, and vice versa. The quieter my room was, the better isolated I felt from my surroundings, and the safer I felt, and vice versa. In the second case, however, the best, most entertaining experiences involved feeling completely immersed ...
Buy the Kickport DSKP2BL Kickport Bass Drum Acoustics Maximizer, Black at Full Compass. Kickports Bass Drum Acoustics Maximizer improves feel, power and tonal qualities of any bass drum from the enhanced subsonic frequencies simply and easily. Instantly achieve a smoother, more focused
Acoustics have played an important role in achieving the most ideal spaces for worship. These effects are achieved by careful acoustics engineering.
The largest ever meeting devoted to the science of acoustics will take place Monday June 30 through Friday July 4, 2008 at the Palais des Congrès in Paris, France. This news release highlights just a few of the 3,500 talks and posters at Acoustics 08.
books.google.comhttps://books.google.com/books/about/Applied_Acoustics.html?id=dejqAAAAMAAJ&utm_source=gb-gplus-shareApplied Acoustics ...
Copyright Inspired Acoustics, a division of Entel. All rights reserved. This webstore is operated by FastSpring, 11 W. Victoria St., Suite 207A, Santa Barbara, CA 93101, USA, a trusted reseller for Inspired Acoustics, a division of Entel. ...
Purpose: : The application of force to the cornea has long been used for measurement of intraocular pressure and more recently to probe the elastic properties of the cornea itself. Current modalities exert force onto the anterior surface of the cornea. Our aim was to ascertain if acoustic radiation force, which would be absorbed across the full corneal thickness, could be safely used to generate corneal surface displacements. Methods: : We tested two configurations. In the first, we used a dual-element probe having a central 40 MHz element and an outer 20 MHz ring, both with a common focus. The second probe was a single-element focused 35 MHz transducer. We used an arbitrary waveform generator in combination with a broadband power amplifier to produce tonebursts to excite the radiation-force emitting element (which in the first configuration was the 20 MHz ring only). We measured the radiation force produced at a series of voltages and determined the maximum duration of the toneburst for each ...
The question of how the static strength of angle-plied nylon cord-reinforced rubber composites simulating aircraft tire carcass is affected by damage accumulation or materials degradation was examined in this study. Upon cyclic loading at 1 Hz, residual tensile strength was gradually lowered with the progression of fatigue damage. The degradation of the residual strength became more drastic toward the end of the fatigue life because of worsening delamination. In contrast, the residual strength after cyclic loading of 10 Hz exhibited a rapid decrease at the beginning of the fatigue life, presumably due to thermal degradation, and then remained virtually constant throughout the life. Acoustic emission (AE) activities were monitored to assess the extent of damage and to explore a possibility of indirect monitoring of residual strength of composites. Total cumulative values of AE hits, counts, and energy, which were defined at the final point of gross failure in static tension, were proportional to ...
questions. Regulators, decision makers, public affairs officers, industry representatives, and other members of the international regulatory community have a high need for training materials on underwater acoustics as well as instructional resources that can be quickly accessed and viewed. To meet this need, the Discovery of Sound in the Sea (DOSITS) Team has been facilitating a free, five-part webinar series for the international regulatory community on topics related to underwater sound.. The fifth and final webinar in this series will provide a brief summary of the previous webinars, and offer an opportunity for participants to follow up on the topics presented and ask additional questions. A panel of previous webinar speakers will be online and available to answer questions. We are requesting that individuals submit questions in advance, although some time will be allotted to answer questions asked during the webinar.. The webinar will be held Thursday, June 2, 2016, at 12:00pm (US East ...
Purpose: The aim of the study was to compare three different elastography methods, namely Strain Elastography (SE), Point Shear-Wave Elastography (pSWE) using Acoustic Radiation Force Impulse (ARFI)-Imaging and 2D-Shear Wave Elastography (2D-SWE), in the same study population for the differentiation of thyroid nodules. Materials and methods: All patients received a conventional ultrasound scan, SE and 2D-SWE, and all patients except for two received ARFI-Imaging. Cytology/histology of thyroid nodules was used as a reference method. SE measures the relative stiffness within the region of interest (ROI) using the surrounding tissue as reference tissue. ARFI mechanically excites the tissue at the ROI using acoustic pulses to generate localized tissue displacements. 2D-SWE measures tissue elasticity using the velocity of many shear waves as they propagate through the tissue. Results: 84 nodules (73 benign and 11 malignant) in 62 patients were analyzed. Sensitivity, specificity and NPV of SE were ...
Background: Acoustic Radiation Force Impulse (ARFI)-imaging is an ultrasound-based elastography method enabling quantitative measurement of tissue stiffness. The aim of the present study was to evaluate sensitivity and specificity of ARFI-imaging for differentiation of thyroid nodules and to compare it to the well evaluated qualitative real-time elastography (RTE). Methods: ARFI-imaging involves the mechanical excitation of tissue using acoustic pulses to generate localized displacements resulting in shear-wave propagation which is tracked using correlation-based methods and recorded in m/s. Inclusion criteria were: nodules $5 mm, and cytological/histological assessment. All patients received conventional ultrasound, real-time elastography (RTE) and ARFI-imaging. Results: One-hundred-fifty-eight nodules in 138 patients were available for analysis. One-hundred-thirty-seven nodules were benign on cytology/histology, and twenty-one nodules were malignant. The median velocity of ARFI-imaging in the ...
an observational point of view, one only has the cross-covariance function C pF (Δ x, Δ y ) and the autocovariance function C FF (Δ x, Δ y ) of the wind forcing. If one postulates a linear relationship between the response at the mooring location and the forcing at other locations via a Greens function, as in (3.1) , then one can perform a linear multiple regression analysis in order to estimate the Greens function. The best estimate G̃ ( x, y ) for the Greens function, in a least. ...
The dramatic progress of smartphone technologies has ushered in a new era of mobile sensing, where traditional wearable on-body sensors are being rapidly superseded by various embedded sensors in our smartphones. For example, a typical smartphone today, has at the very least a GPS, WiFi, Bluetooth, triaxial accelerometer, and gyroscope. Alongside, new accessories are emerging such as proximity, magnetometer, barometer, temperature, and pressure sensors. Even the default microphone can act as an acoustic sensor to track noise exposure for example. These sensors act as a lens to understand the users context along different dimensions.. Data can be passively collected from these sensors without interrupting the user. As a result, this new era of mobile sensing has fueled significant interest in understanding what can be extracted from such sensor data both instantaneously as well as considering volumes of time series from these sensors. For example, GPS logs can be used to determine ...
A new British loudspeaker manufacturer enters the market. After more than thirty years of development, Pearl Acoustics have finally launched their Sibelius range of loudspeakers onto the market.. The philosophy behind the Sibelius design is simplicity, purity and sustainability. Built more like a musical instrument than an electronic component of a HiFi system, The Sibelius speaker boast no cross overs, filters or other electronic components. Just two, sliver plated, multi-strand cables link the drive units to their terminal posts.. Built to last a lifetime, the Sibelius speakers are designed for those that want to get as close to the original performance as possible. The shallow drive cones are designed to give a naturally wide soundstage, while the enclosures massively thick walls (3.3cm) enable the creation of low frequencies by using the same techniques as an acoustic double bass or cello.. The reason, for the long development time was having to overcome the three main problems associated ...