Characterization of the performance of 1–3 type piezocomposites for low‐frequency applications

1993 ◽  
Vol 73 (3) ◽  
pp. 1403-1410 ◽  
Author(s):  
Q. M. Zhang ◽  
Wenwu Cao ◽  
H. Wang ◽  
L. E. Cross
Keyword(s):  
Low Frequency

Characterization of Uncertainty in Low Frequency Active Sonar

2002 ◽  
Author(s):  
Peter G. Cable
Keyword(s):  
Low Frequency ◽  
Active Sonar

Using low-frequency noise characterization of AlGaN/GaN HEMT as a tool for technology assessment and failure prediction

2004 ◽  
Author(s):  
Jean-Guy Tartarin ◽  
Geoffroy Soubercaze-Pun ◽  
Abdelali Rennane ◽  
Laurent Bary ◽  
Robert Plana ◽  
...  
Keyword(s):  
Technology Assessment ◽  
Low Frequency ◽  
Failure Prediction ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Gan Hemt ◽  
Noise Characterization

Measurement System for the Characterization of the Human Body as a Communication Channel at Low Frequency

2005 ◽  
Author(s):  
Marc Wegmueller ◽  
Adrian Lehner ◽  
Juerg Froehlich ◽  
Robert Reutemann ◽  
Michael Oberle ◽  
...  
Keyword(s):  
Human Body ◽  
Measurement System ◽  
Communication Channel ◽  
Low Frequency

Low frequency noise characterization of the GaN LEDs

2005 ◽  
Author(s):  
S. Bychikhin ◽  
L.K.J. Vandamme ◽  
J. Kuzmik ◽  
G. Meneghesso ◽  
D. Pogany
Keyword(s):  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Noise Characterization

scholarly journals Analysis of Flow Instabilities on a Three-Bladed Axial Inducer in Fixed and Rotating Frames

2018 ◽  
Vol 141 (4) ◽  
Author(s):  
Giovanni Pace ◽  
Dario Valentini ◽  
Angelo Pasini ◽  
Ruzbeh Hadavandi ◽  
Luca d'Agostino
Keyword(s):  
Low Frequency ◽  
Flow Instabilities ◽  
Test Facility ◽  
Pressure Measurements ◽  
Dynamic Characterization ◽  
Rotating Frames ◽  
Induced Flow ◽  
High Head ◽  
Pump Inlet

The paper describes the results of recent experiments carried out in the Cavitating Pump Rotordynamic Test Facility for the dynamic characterization of cavitation-induced flow instabilities as simultaneously observed in the stationary and rotating frames of a high-head, three-bladed axial inducer with tapered hub and variable pitch. The flow instabilities occurring in the eye and inside the blading of the inducer have been detected, identified, and monitored by means of the spectral analysis of the pressure measurements simultaneously performed in the stationary and rotating frames by multiple transducers mounted on the casing near the inducer eye and on the inducer hub along the blade channels. An interaction between the unstable flows in the pump inlet and in the blade channels during cavitating regime has been detected. The interaction is between a low frequency axial phenomenon, which cyclically fills and empties each blade channel with cavitation, and a rotating phenomenon detected in the inducer eye.

scholarly journals CARACTERIZAÇÕES ANATÔMICA E FÍSICO-MECÂNICA DA MADEIRA DE Liquidambar sp.

FLORESTA ◽  
2015 ◽  
Vol 45 (4) ◽  
pp. 723 ◽  
Author(s):  
Thaís Pereira Freitas ◽  
Lairo David Feuchard ◽  
José Tarcísio Silva Oliveira ◽  
Juarez Benigno Paes ◽  
Marina Donária Chaves Arantes
Keyword(s):  
Specific Gravity ◽  
Dimensional Stability ◽  
Mechanical Characterization ◽  
Great Influence ◽  
Low Frequency ◽  
Ground Level ◽  
Espírito Santo ◽  
Vessel Elements ◽  
Espirito Santo

Este trabalho teve como objetivo a caracterização anatômica e físico-mecânica da madeira de Liquidambar sp. Para tanto, foram utilizadas três árvores com oito anos de idade, provenientes de um arboreto localizado do município de Guaçuí, Espírito Santo. As características anatômicas analisadas foram as dimensões das fibras (comprimento, diâmetro total e do lume e espessura da parede), dos elementos de vasos (diâmetro tangencial e frequência) e dos raios (altura, largura e frequência). Para a caracterização físico-mecânica foram avaliadas a massa específica (básica, aparente a 12% de umidade e anidra), as contrações totais lineares e volumétrica, a resistência à flexão estática, à compressão paralela às fibras, ao cisalhamento e dureza Janka. Constatou-se frequência vascular numerosa com vasos de pequeno diâmetro tangencial, raios heterocelulares ocorrendo em baixa frequência, e fibras libriformes longas de paredes delgadas a espessas. A massa específica básica da madeira proveniente de discos retirados a 1,30 m do nível do solo foi de 0,48 g cm-3, sendo considerada média, a estabilidade dimensional foi considerada baixa, e houve grande influência da umidade nos valores de resistência da madeira. AbstractAnatomical and physical-mechanical characterization of Liquidambar sp. wood. This research aimed to improve anatomical, physical and mechanical characterization of Liquidambar sp.wood. Three trees were obtained, at eight years of age, from an arboretum located in Guaçuí, Espírito Santo State, Brazil. The analyzed variables were dimensions of the fibers (length, total diameter and diameter of the lumen and wall thickness), the vessel elements (tangential diameter and frequency), and ray (height, width and frequency). The specific gravity (basic, at 12% moisture content and dry), and total volumetric and linear shrinkages, resistance to bending, compression parallel to the fibers, shear and Janka hardness. For anatomical description it was found numerous vessels often with small tangential diameter, heterocellular rays occurring at low frequency, and long libriform fibers with thick to thin walls. The specific gravity of wood from disks taken at 1.30 m from ground level was 0.48 g cm-3, wich we considered average, the dimensional stability was low, and there was great influence of moisture in the resistance values in wood.Keywords: Anatomy; specific gravity; dimensional stability; mechanical strength.

In-Circuit Characterization of Low-Frequency Stability Margins in Power Amplifiers

2019 ◽  
Vol 67 (2) ◽  
pp. 822-833
Author(s):  
Jose Manuel Gonzalez ◽  
Nerea Otegi ◽  
Aitziber Anakabe ◽  
Libe Mori ◽  
Asier Barcenilla ◽  
...  
Keyword(s):  
Power Amplifiers ◽  
Low Frequency ◽  
Frequency Stability ◽  
Stability Margins

scholarly journals Characterization of Extremely Low Frequency Magnetic Fields from Diesel, Gasoline and Hybrid Cars under Controlled Conditions

2015 ◽  
Vol 12 (2) ◽  
pp. 1651-1666 ◽  
Author(s):  
Ronen Hareuveny ◽  
Madhuri Sudan ◽  
Malka Halgamuge ◽  
Yoav Yaffe ◽  
Yuval Tzabari ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Low Frequency ◽  
Extremely Low Frequency ◽  
Controlled Conditions
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