179th Meeting of the Acoustical Society of America最新文献

Multi-year regional infrasound detection of Tungurahua, El Reventador, and Sangay volcanoes in Ecuador from 2006 to 2013 2006年至2013年厄瓜多尔通古拉瓦火山、雷文塔多火山和桑盖火山多年区域次声探测

179th Meeting of the Acoustical Society of America Pub Date : 1900-01-01 DOI: 10.1121/2.0001362

H. Ortiz, R. Matoza, C. Garapaty, K. Rose, P. Ramón, M. Ruiz

{"title":"Multi-year regional infrasound detection of Tungurahua, El Reventador, and Sangay volcanoes in Ecuador from 2006 to 2013","authors":"H. Ortiz, R. Matoza, C. Garapaty, K. Rose, P. Ramón, M. Ruiz","doi":"10.1121/2.0001362","DOIUrl":"https://doi.org/10.1121/2.0001362","url":null,"abstract":"As part of the Acoustic Surveillance for Hazardous Eruptions project, two infrasound arrays were installed in northern and central Ecuador. The RIOE and LITE arrays were operational between 2006 and 2013, recording thousands of infrasound signals originating from eruptions of Tungurahua, El Reventador, and Sangay. We use Progressive Multi-Channel Correlation array processing together with hierarchical clustering to identify and associate impulsive infrasound signals with each volcano. Infrasound detections correspond to quasi-continuous activity of Sangay between mid 2006 and mid 2012, at least thirteen periods of activity of Tungurahua between 2006 and mid 2012, and strong signals from El Reventador in early 2008. We validate our detections using satellite observations from the MODIS (Moderate Resolution Imaging Spectroradiometer) volcano detection algorithm (MODVOLC) and independent eruption catalogs. For Sangay, we find a good agreement between our infrasound detections and MODVOLC triggers, whereas for El Reventador the agreement is fair. We attribute the fair correspondence at El Reventador to the low-temporal resolution of MODIS data and frequent cloud cover in the region that reduce satellite observational capability. Finally, our study highlights the benefits of infrasound arrays for monitoring volcanoes in Ecuador at regional distances, while further investigating the processes that limit volcanic infrasound detection.","PeriodicalId":394589,"journal":{"name":"179th Meeting of the Acoustical Society of America","volume":"28 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120819392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Sound speed measurements in ethanol/water solutions and Kentucky bourbon whiskey 乙醇/水溶液和肯塔基波旁威士忌的声速测量

179th Meeting of the Acoustical Society of America Pub Date : 1900-01-01 DOI: 10.1121/2.0001396

Stanley A. Cheyne

引用次数: 1

Assessment of statistical features of the diffuse acoustic field in a test section of a cavitation tunnel 空化隧道试验段扩散声场统计特征评价

179th Meeting of the Acoustical Society of America Pub Date : 1900-01-01 DOI: 10.1121/2.0001335

R. Boucheron

引用次数: 0

Monolingual vs codeswitching modes: Voice onset time in Lebanese Arabic and English 单语vs代码转换模式:黎巴嫩阿拉伯语和英语的语音开始时间

179th Meeting of the Acoustical Society of America Pub Date : 1900-01-01 DOI: 10.1121/2.0001422

Niamh E. Kelly, Mia El Houry, Farah Ghamloush

引用次数: 0

Identifying gesture onsets with high-order derivatives of articulatory trajectories 用关节轨迹的高阶导数识别手势动作

179th Meeting of the Acoustical Society of America Pub Date : 1900-01-01 DOI: 10.1121/2.0001460

Dan Cameron Burgdorf

{"title":"Identifying gesture onsets with high-order derivatives of articulatory trajectories","authors":"Dan Cameron Burgdorf","doi":"10.1121/2.0001460","DOIUrl":"https://doi.org/10.1121/2.0001460","url":null,"abstract":"Articulatory trajectories are useful for measuring speech properties, but come with complications: a given trajectory may be influenced by multiple articulators and/or multiple overlapping gestures. Standard procedure is to identify landmarks from the trajectory and its velocity. Here, an alternative procedure is presented: higher order derivatives can be used to identify gesture onsets. High-order derivatives are generally associated with signal noise and not considered to be meaningful, but more broadly, they reflect rapid changes in acceleration, which can derive from sources other than random noise. It’s demonstrated that such high-order activity at gesture onsets is both predicted by the Task Dynamic Model of speech production (Saltzman & Munhall 1989) and observed in real electromagnetic articulography (EMA) data. Articulator trajectories generated with the Task Dynamics Application (TADA) Matlab implementation of this model (Nam & Goldstein 2004) show a pattern of increasing activity around changes in gestural activation and decreasing activity elsewhere as successive derivatives are taken. This was confirmed in EMA data on glides, demonstrating not only that the effect is real, but that it can be measurable above other noise. This activation noise can be isolated with targeted filtering, and may yield further insights into speech motor control.","PeriodicalId":394589,"journal":{"name":"179th Meeting of the Acoustical Society of America","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127107374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An acoustic study of /o/ fronting among Lumbee English speakers in Robeson County, North Carolina 北卡罗来纳州罗布森县兰比族英语使用者/o/前音的声学研究

179th Meeting of the Acoustical Society of America Pub Date : 1900-01-01 DOI: 10.1121/2.0001342

Marie Bissell

引用次数: 0

Applying deflectometry techniques to non-reflective planar panels using add-on reflective material 将偏转测量技术应用于使用附加反射材料的非反射平面面板

179th Meeting of the Acoustical Society of America Pub Date : 1900-01-01 DOI: 10.1121/2.0001402

Gary L. Rhoades, Micah R. Shepherd, Jeff Harris

{"title":"Applying deflectometry techniques to non-reflective planar panels using add-on reflective material","authors":"Gary L. Rhoades, Micah R. Shepherd, Jeff Harris","doi":"10.1121/2.0001402","DOIUrl":"https://doi.org/10.1121/2.0001402","url":null,"abstract":"Reflected grid deflectometry is an optical method of vibration analysis relying on specular reflections to create amplifications of measured deformations in a planar test structure, resulting in high resolution slope and deflection plots of the test surface. Therefore, the structure under test is required to have a reflective surface. Application has so far been limited to ideal mirror-finished planar objects. An experiment is constructed to test the effectiveness of add-on reflective material on non-reflective planar panels for deflectometry measurements, using a collection of adhesive tapes, film, and spray. The structural deflection due to a point impact is measured, and results for each add-on material are then compared and discussed. The findings indicate that tapes, while cheap, are manufactured without strict tolerances on thickness, causing distortions in the reflected image and therefore the deflection plots. Film can be applied with limited success, but further testing is required to refine the application method. Spray-on reflective material, which is only applicable on transparent surfaces, produces deflection plots comparable in quality to those of an ideal mirror.","PeriodicalId":394589,"journal":{"name":"179th Meeting of the Acoustical Society of America","volume":"27 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115778850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development and Assessment of a LEONAR Acoustic Liner Design for Landing Systems Noise Minimization 用于着陆系统噪声最小化的LEONAR声学衬垫设计的开发与评估

179th Meeting of the Acoustical Society of America Pub Date : 1900-01-01 DOI: 10.1121/2.0001359

F. Simon, A. Ghouali, V. Fascio, V. Fleury

引用次数: 1

Steady state pressure distribution in a simple algebraic model of the cochlea with a rigid basilar membrane 具有刚性基底膜的耳蜗的简单代数模型的稳态压力分布

179th Meeting of the Acoustical Society of America Pub Date : 1900-01-01 DOI: 10.1121/2.0001358

H. Knoll, A. Vermeulen

引用次数: 0

Non-destructive non-contact concrete evaluation using an automated surface wave scanner 使用自动表面波扫描仪进行非破坏性非接触式混凝土评价

179th Meeting of the Acoustical Society of America Pub Date : 1900-01-01 DOI: 10.1121/2.0001337

B. Piwakowski, R. Drelich, C. Ciccarone, Ji Li, J. Henault, V. Garnier

引用次数: 1