scholarly journals Advanced automobile crash detection by acoustic methods

2019 ◽  
Author(s):  
Keegan Yi Hang Sim ◽  
Yijia Chen ◽  
Yuxuan Wan ◽  
Kevin Chau
Keyword(s):  
Acoustic Methods ◽  
Automobile Crash

Advanced automobile crash detection by acoustic methods

2019 ◽  
Vol 146 (4) ◽  
pp. 2845-2845
Author(s):  
Yi Hang Sim ◽  
Yijia Chen ◽  
Lijia Wu ◽  
Xianzheng Geng ◽  
Yuxuan Wan ◽  
...  
Keyword(s):  
Acoustic Methods ◽  
Automobile Crash

Medium-frequency acoustic methods and tools for the study of the aquatic environment.

2020 ◽  
Author(s):  
N.A. Grekov ◽  
◽  
A.N. Grekov ◽  
E.N. Sychov ◽  
◽  
...  
Keyword(s):  
Aquatic Environment ◽  
Medium Frequency ◽  
Acoustic Methods

Application of acoustic methods for rock mass hydrotreatment parameter control and efficiency assessment

2018 ◽  
Vol 138 (2/2018) ◽  
pp. 79-82 ◽  
Author(s):  
A.V. Shadrin ◽  
Yu.A. Diyuk ◽  
A.S. Teleguz
Keyword(s):  
Rock Mass ◽  
Parameter Control ◽  
Efficiency Assessment ◽  
Acoustic Methods

APPLICATION OF ACOUSTIC METHODS IN RESEARCHES OF THE BOTTOM SEDIMENT DYNAMICS

2018 ◽  
Author(s):  
Б. Дивинский ◽  
B. Divinskiy ◽  
И. Грюне ◽  
I. Gryune ◽  
Р. Косьян ◽  
...  
Keyword(s):  
Suspended Sediment ◽  
Sediment Concentration ◽  
Irregular Waves ◽  
Single Frequency ◽  
Contactless Measurement ◽  
Measurement Means ◽  
Uniform Field ◽  
Wave Flume ◽  
Acoustic Methods ◽  
Back Scattering

Acoustic methods belong to contactless measurement means, possess high spatial and time resolution. Thus, the use of multifrequency allows directly profile both concentration and granulometric structure of the suspended substances. In 2008 in the Big Wave Flume (Hanover, Germany) by efforts of the Russian and German scientists there have been carried out the experiment on studying the bottom material suspension laws under the influence of irregular waves. The Aquascat 1000 acoustic back scattering sensor (ABS) manufactured by British company Aquatec (www.aquatecsubsea.com), equipped by a three-frequency transmitter with frequencies 1,0, 2,0 and 3,84 MHz, has been set on distance of 0,75 m from the bottom and 111 m from wave generator at the total depth of 3,2 m. Several dozen series of measurements at various parameters of surface waves have been carried out. The general picture of suspension is so that the external dynamic influence (currents, wave movements, turbulence, gravitation forces) creates a non-uniform field (gradient) of the suspended particles and in most cases due to this the average size of particles undergoes to the spatial-time variations. For this reason while defining the mass concentration of suspended sediment, using the single frequency transmitter there is necessity for numerous definition of the suspension granulometric structure what by isn’t always possible. If two and more frequencies are used the observed results comparison can give the information on average diameters of particles and on that basis the calculation of suspended sediment concentration is possibleLet's emphasize the basic advantages of back scattering acoustic gauges usage: – Obtaining the particles sizes and concentration distribution profiles is possible; – The initial granulometric structure of bottom sediments can be unknown (at use of several frequencies). The following can be referred to some lacks of the device: – The system should be calibrated in laboratory conditions; – In a positive feedback conditions the iterative computing process can converge to zero or to infinity. In this case experiments with a variation of carrier frequencies chosen for the analysis allow partially solve the problem (say experiments with different frequencies pairs, as 2/1 of MHz or 4/2 MHz).

Data Echoes: Sound, Evidence, and Acoustic Methods in Energy Landscapes

2021 ◽  
pp. 016224392110345
Author(s):  
James Maguire
Keyword(s):  
Geothermal Energy ◽  
Energy Production ◽  
Model Building ◽  
Acoustic Method ◽  
Time Frame ◽  
Energy Landscapes ◽  
Geological Evidence ◽  
Temporal Form ◽  
Acoustic Methods ◽  
Intractable Problem

This paper explores an informal acoustic method developed by a group of industrial geologists working in geothermal energy landscapes in the southwest of Iceland. Through a series of ethnographic descriptions, this paper renders the work these geologists carry out in sonic terms, emphasizing how they use their bodies as sonic detectors in the production of geological evidence. Sound, the paper argues, is what allows geologists to make the intractable problem of volcanic cooling doable. It does this by differentiating two forms of evidence. Primary evidence, which ends up as data in geological reports, and secondary sonic evidence, which is what establishes that this primary evidence is, in fact, evidence. The paper introduces the concept data echoes as a way to think about how sound articulates between these evidential protocols. As echo, sound works as an outside, which, while remaining external to official protocols of knowledge production, nevertheless helps to constitute distinctions that are meaningful to the production of those categories. As data echoes through the various moments of data capture, analysis, and model building, sound’s temporal form helps to predict the time frame of volcanic cooling, as it affects both the immediate energy production scenarios and the long durée of volcanic time.

scholarly journals Distribution of rorquals and Atlantic cod in relation to their prey in the Norwegian high Arctic

Polar Biology ◽  
2021 ◽  
Author(s):  
Hiroko K. Solvang ◽  
Tore Haug ◽  
Tor Knutsen ◽  
Harald Gjøsæter ◽  
Bjarte Bogstad ◽  
...  
Keyword(s):  
Prey Species ◽  
Barents Sea ◽  
Atlantic Cod ◽  
Spatial Association ◽  
High Arctic ◽  
Humpback Whales ◽  
Predatory Fish ◽  
Detection Range ◽  
Minke Whales ◽  
Acoustic Methods

AbstractRecent warming in the Barents Sea has led to changes in the spatial distribution of both zooplankton and fish, with boreal communities expanding northwards. A similar northward expansion has been observed in several rorqual species that migrate into northern waters to take advantage of high summer productivity, hence feeding opportunities. Based on ecosystem surveys conducted during August–September in 2014–2017, we investigated the spatial associations among the three rorqual species of blue, fin, and common minke whales, the predatory fish Atlantic cod, and their main prey groups (zooplankton, 0-group fish, Atlantic cod, and capelin) in Arctic Ocean waters to the west and north of Svalbard. During the surveys, whale sightings were recorded by dedicated whale observers on the bridge of the vessel, whereas the distribution and abundance of cod and prey species were assessed using trawling and acoustic methods. Based on existing knowledge on the dive habits of these rorquals, we divided our analyses into two depth regions: the upper 200 m of the water column and waters below 200 m. Since humpback whales were absent in the area in 2016 and 2017, they were not included in the subsequent analyses of spatial association. No association or spatial overlap between fin and blue whales and any of the prey species investigated was found, while associations and overlaps were found between minke whales and zooplankton/0-group fish in the upper 200 m and between minke whales and Atlantic cod at depths below 200 m. A prey detection range of more than 10 km was suggested for minke whales in the upper water layers.

Acoustic methods for determining the effective flow resistivity of fibrous materials

1992 ◽  
Vol 153 (1) ◽  
pp. 186-191 ◽  
Author(s):  
R. Woodcock ◽  
M. Hodgson
Keyword(s):  
Fibrous Materials ◽  
Acoustic Methods ◽  
Flow Resistivity

Application of optical and acoustic methods for estimation of fatigue damage

2010 ◽  
Vol 46 (15) ◽  
pp. 1696-1701
Author(s):  
F. M. Mitenkov ◽  
V. V. Mishakin ◽  
S. N. Pichkov ◽  
V. A. Klyushnikov ◽  
N. V. Danilova
Keyword(s):  
Fatigue Damage ◽  
Acoustic Methods

Passive acoustic methods of small boat detection, tracking and classification

2017 ◽  
Author(s):  
Alexander Pollara ◽  
Alexander Sutin ◽  
Hady Salloum
Keyword(s):  
Small Boat ◽  
Acoustic Methods ◽  
Passive Acoustic
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