Stranger danger: acoustic response of the Veery (Catharus fuscescens) via heterospecific eavesdropping on the Tufted Titmouse (Baeolophus bicolor)

2018 ◽  
Vol 130 (1) ◽  
pp. 168-179
Author(s):  
Wieteke A. Holthuijzen
Keyword(s):  
Acoustic Response ◽  
Tufted Titmouse ◽  
Stranger Danger ◽  
Heterospecific Eavesdropping ◽  
Catharus Fuscescens

APPLICATION OF UNCONVENTIONAL METHODS FOR FREQUENCY ANALYSIS IN ACOUSTICS

Akustika ◽  
2020 ◽  
Vol 36 (36) ◽  
pp. 25-32
Author(s):  
Jaroslav Smutný ◽  
Dušan Janoštík ◽  
Viktor Nohál
Keyword(s):  
Fourier Transform ◽  
Discrete Fourier Transform ◽  
Frequency Analysis ◽  
Mathematical Analysis ◽  
Measured Data ◽  
Application Area ◽  
Acoustic Response ◽  
Recommendations For Practice ◽  
Unconventional Methods ◽  
Frequency Area

The goal of this study is to familiarize a wider professional public with not fully known procedures suitable for processing measured data in the frequency area. Described is the use of the so-called Multi-taper method to analyze the acoustic response. This transformation belongs to a group of nonparametric methods outgoing from discrete Fourier transform, and this study includes its mathematical analysis and description. In addition, the use of respective method in a specific application area and recommendations for practice are described.

Veery (Catharus fuscescens)

2005 ◽  
Author(s):  
Louis R. Bevier ◽  
Alan F. Poole ◽  
William Moskoff
Keyword(s):  
Catharus Fuscescens

Stranger Danger

2020 ◽  
Author(s):  
Paul M. Renfro
Keyword(s):  
News Media ◽  
Sex Offender ◽  
The United States ◽  
Family Values ◽  
Law And Order ◽  
High Profile ◽  
Amber Alerts ◽  
Actual Figure ◽  
Stranger Danger ◽  
Murdered Children

Starting in the late 1970s, a moral panic concerning child kidnapping and exploitation gripped the United States. For many Americans, a series of high-profile cases of missing and murdered children, publicized through an emergent twenty-four-hour news cycle, signaled a “national epidemic” of child abductions perpetrated by strangers. Some observers insisted that fifty thousand or more children fell victim to stranger kidnappings in any given year. (The actual figure was and remains about one hundred.) Stranger Danger demonstrates how racialized and sexualized fears of stranger abduction—stoked by the news media, politicians from across the partisan divide, bereaved parents, and the business sector—helped to underwrite broader transformations in US political culture and political economy. Specifically, the child kidnapping scare further legitimated a bipartisan investment in “family values” and “law and order,” thereby enabling the development and expansion of sex offender registries, AMBER Alerts, and other mechanisms designed to safeguard young Americans and their families from “stranger danger”—and to punish the strangers who supposedly threatened them.

scholarly journals Swirl–nozzle interaction experiment: quasi-steady model-based analysis

2021 ◽  
Vol 62 (8) ◽  
Author(s):  
Lionel Hirschberg ◽  
Friedrich Bake ◽  
Karsten Knobloch ◽  
Angelo Rudolphi ◽  
Sebastian Kruck ◽  
...  
Keyword(s):  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Acoustic Pressure ◽  
Quantitative Information ◽  
Acoustic Response ◽  
Flow Measurements ◽  
Flow Rate Change ◽  
Interaction Experiment ◽  
Swirl Stabilized Combustion

AbstractMeasurements of sound due to swirl–nozzle interaction are presented. In the experiment a swirl structure was generated by means of unsteady tangential injection into a steady swirl-free flow upstream from a choked convergent–divergent nozzle. Ingestion of swirl by the choked nozzle caused a mass-flow rate change, which resulted in a downstream-measured acoustic response. The downstream acoustic pressure was found to remain negative as long as the swirl is maintained and reflections from the open downstream pipe termination do not interfere. The amplitude of this initial acoustic response was found to be proportional to the square of the tangential mass-flow rate used to generate swirl. When the tangential injection valve was closed, the mass-flow rate through the nozzle increased, resulting in an increase of the downstream acoustic pressure. This increase in signal was compared to the prediction of an empirical quasi-steady model, constructed from steady-state flow measurements. As the opening time of the valve was varied, the signal due to swirl evacuation showed an initial overshoot with respect to quasi-steady behavior, after which it gradually decayed to quasi-steady behavior for tangential injection times long compared to the convection time in the pipe upstream of the nozzle. This demonstrates that the acoustic signal can be used to obtain quantitative information concerning the time dependence of the swirl in the system. This could be useful for understanding the dynamics of flow in engines with swirl-stabilized combustion. Graphic abstract

Design and optimization of local acoustic response in mid-frequency vibro-acoustic systems

2021 ◽  
Vol 181 ◽  
pp. 108177
Author(s):  
Yang Yu ◽  
Guozhong Zhao ◽  
Shanhong Ren ◽  
Yuming Li
Keyword(s):  
Acoustic Response ◽  
Design And Optimization

scholarly journals Stranger Danger!

2019 ◽  
Author(s):  
Karla Badillo-Urquiola ◽  
Diva Smriti ◽  
Brenna McNally ◽  
Evan Golub ◽  
Elizabeth Bonsignore ◽  
...  
Keyword(s):  
Stranger Danger

Acoustic response of a rigid-frame porous medium plate with a periodic set of inclusions

2009 ◽  
Vol 126 (2) ◽  
pp. 685-693 ◽  
Author(s):  
J.-P. Groby ◽  
A. Wirgin ◽  
L. De Ryck ◽  
W. Lauriks ◽  
R. P. Gilbert ◽  
...  
Keyword(s):  
Porous Medium ◽  
Acoustic Response ◽  
Rigid Frame
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