Loudspeaker system for converting a digitized electric signal into an acoustic signal

1989 ◽  
Vol 85 (1) ◽  
pp. 530-530
Author(s):  
Joris A. M. Nieuwendijk ◽  
Wilhelmus D. A. M. Van Gijsel
Keyword(s):  
Acoustic Signal ◽  
Electric Signal

scholarly journals Study on Electric-Magnetic-Acoustic Signal Regularity and Its Correlation during Rock Shear Failure

2019 ◽  
Vol 2019 ◽  
pp. 1-12
Author(s):  
Huilin Jia ◽  
Yue Niu ◽  
Xiaofei Liu ◽  
Enyuan Wang
Keyword(s):  
Acoustic Signal ◽  
Damage Evolution ◽  
Shear Failure ◽  
Tracking System ◽  
Correlation Coefficients ◽  
Coupling Model ◽  
Electric Signal ◽  
Rock Materials ◽  
Coal Rock ◽  
Electric Signals

http://mts.hindawi.com/update/) in our Manuscript Tracking System and after you have logged in click on the ORCID link at the top of the page. This link will take you to the ORCID website where you will be able to create an account for yourself. Once you have done so, your new ORCID will be saved in our Manuscript Tracking System automatically."?>During mining activities, the deformation and damage of coal rock materials might result in coal rock dynamic disasters, such as rock burst. It leads to serious casualties and property losses. Generally, the occurrence of dynamic failure of coal and rock are caused by shear failure of coal seam. Geophysics signals are generated and related to damage evolution in this loading process. In this paper, sandstone samples were subjected to shear failure laboratory experiments, and the electric-magnetic-acoustic signal regularity was measured and analyzed comparatively. The results indicated magnetic signals were more correlated with stress and acoustic emission (AE) signals, while the amplitude of electric signal fluctuation was larger when main failure occurred. With the increase of sample size and shear strength, the strength of electric-magnetic-acoustic signals increased. The correlation coefficients between the magnetic signal and stress as well as AE energy were superior to those of electric signals. The coupling model between AE and electric signals was established, which shows good statistical correlation. This study lays the foundations for further interpreting the generation mechanism of the electric signal. It provides a new method to indicate the damage evolution of coal rock materials.

Acoustic Signal Based Automatic Vehicle Detection System

2012 ◽  
Vol 2 (4) ◽  
pp. 88-89
Author(s):  
Sai Sandeep.k Sai Sandeep.k ◽  
◽  
P. Vijay Kumar
Keyword(s):  
Acoustic Signal ◽  
Detection System ◽  
Vehicle Detection

Enhancements of Non-contact Measurements of Electrical Waveforms on the Proximity of a Signal Surface Using Groups of Pulses

2002 ◽  
Author(s):  
Fenglei Du ◽  
Greg Bridges ◽  
D.J. Thomson ◽  
Rama R. Goruganthu ◽  
Shawn McBride ◽  
...  
Keyword(s):  
Integrated Circuits ◽  
Integrated Circuit ◽  
Signal To Noise Ratio ◽  
Electrostatic Force ◽  
Single Pulse ◽  
Electric Signal ◽  
Measurement Instruments ◽  
Cycle Times ◽  
Force Microscopy ◽  
And Performance

Abstract With the ever-increasing density and performance of integrated circuits, non-invasive, accurate, and high spatial and temporal resolution electric signal measurement instruments hold the key to performing successful diagnostics and failure analysis. Sampled electrostatic force microscopy (EFM) has the potential for such applications. It provides a noninvasive approach to measuring high frequency internal integrated circuit signals. Previous EFMs operate using a repetitive single-pulse sampling approach and are inherently subject to the signal-to-noise ratio (SNR) problems when test pattern duty cycle times become large. In this paper we present an innovative technique that uses groups of pulses to improve the SNR of sampled EFM systems. The approach can easily provide more than an order-ofmagnitude improvement to the SNR. The details of the approach are presented.

Microbubble generation and trapping induced by femtosecond laser and acoustic signal analysis

2017 ◽  
Vol 34 (1-2) ◽  
pp. 33-44
Author(s):  
Kun YANG ◽  
Linyan XUE ◽  
Kang YIN ◽  
Shuang LIU ◽  
Jie MENG
Keyword(s):  
Femtosecond Laser ◽  
Acoustic Signal ◽  
Signal Analysis ◽  
Acoustic Signal Analysis

Neurofilament Proteins as Prognostic Biomarkers in Neurological Disorders

2020 ◽  
Vol 25 (43) ◽  
pp. 4560-4569 ◽  
Author(s):  
Yichen Lee ◽  
Bo H. Lee ◽  
William Yip ◽  
Pingchen Chou ◽  
Bak-Sau Yip
Keyword(s):  
Amyotrophic Lateral Sclerosis ◽  
Nervous System ◽  
Trinucleotide Repeat ◽  
Muscular Atrophy ◽  
Electric Signal ◽  
Motor Neuropathy ◽  
Post Translational Modification ◽  
Neurofilament Proteins ◽  
Type Iv ◽  
Lateral Sclerosis

Neurofilaments: light, medium, and heavy (abbreviated as NF-L, NF-M, and NF-H, respectively), which belong to Type IV intermediate filament family (IF), are neuron-specific cytoskeletal components. Neurofilaments are axonal structural components and integral components of synapses, which are important for neuronal electric signal transmissions along the axons and post-translational modification. Abnormal assembly of neurofilaments is found in several human neurodegenerative diseases such as amyotrophic lateral sclerosis (ALS), infantile spinal muscular atrophy (SMA), and hereditary sensory-motor neuropathy (HSMN). In addition, those pathological neurofilament accumulations are known in α-synuclein in Parkinson’s disease (PD), Aβ and tau in Alzheimer’s disease (AD), polyglutamine in CAG trinucleotide repeat disorders, superoxide dismutase 1 (SOD1), TAR DNA-binding protein 43 (TDP43), neuronal FUS proteins, optineurin (OPTN), ubiquilin 2 (UBQLN2), and dipeptide repeat protein (DRP) in amyotrophic lateral sclerosis (ALS). When axon damage occurs in central nervous disorders, neurofilament proteins are released and delivered into cerebrospinal fluid (CSF), which are then circulated into blood. New quantitative analyses and assay techniques are well-developed for the detection of neurofilament proteins, particularly NF-L and the phosphorylated NF-H (pNF-H) in CSF and serum. This review discusses the potential of using peripheral blood NF quantities and evaluating the severity of damage in the nervous system. Intermediate filaments could be promising biomarkers for evaluating disease progression in different nervous system disorders.

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