Determination of Acoustic Emissions Data Characteristics under the Response of Pencil Lead Fracture Procedure

2021 ◽  
Author(s):  
Khairul Afinawati Hashim ◽  
Noorsuhada Md Nor ◽  
Shahrum Abdullah ◽  
Fatin Farzana Aziz ◽  
Juliana Idrus
Keyword(s):  
Acoustic Emissions ◽  
Lead Fracture ◽  
Pencil Lead

A Method for Acoustic Emission Source Identification Based on Optimisation

2009 ◽  
Vol 413-414 ◽  
pp. 793-801 ◽  
Author(s):  
Andrew Spencer ◽  
Keith Worden ◽  
Gareth Pierce
Keyword(s):  
Acoustic Emission ◽  
High Cycle Fatigue ◽  
Lamb Waves ◽  
Acoustic Emissions ◽  
Ultrasonic Waves ◽  
Cycle Fatigue ◽  
Simulation Approach ◽  
Acoustic Emission Source ◽  
Interaction Simulation ◽  
Pencil Lead

When a metal or composite structure begins to fail, for example due to high cycle fatigue, acoustic emissions caused by the propagation of cracks give rise to bursts of ultrasonic waves travelling through the structure. The health of a structure can be monitored by means of sensors which detect these waves. Acoustic emissions are often generated in experiments by breaking a pencil lead against the surface of the structure in a standardised way but the forces that this imparts are not well understood at present. A Local Interaction Simulation Approach (LISA) algorithm has been implemented to simulate the propagation of ultrasonic waves. This code has been validated against experiments in previous work and has been shown to accurately reproduce the propagation of Lamb waves (including reflections and dispersion etc.) within thin-plate like structures. This paper deals with the use of the LISA code to characterise the forces associated with standard pencil lead breaks. The displacement due to waves emanating from a break is measured and a Differential Evolution (DE) optimisation scheme is used to find the optimal profile of forcing to match the simulation with experiment.

Determination of anionic surfactants in real samples using a low-cost and high sensitive solid contact surfactant sensor with MWCNTs as the ion-to-electron transducer

2017 ◽  
Vol 9 (15) ◽  
pp. 2305-2314 ◽  
Author(s):  
Nikola Sakač ◽  
Maja Karnaš ◽  
Marija Jozanović ◽  
Martina Medvidović-Kosanović ◽  
Sanja Martinez ◽  
...  
Keyword(s):  
Anionic Surfactants ◽  
Low Cost ◽  
Fast Response ◽  
Solid Contact ◽  
Real Samples ◽  
Long Life ◽  
Pencil Lead

Long-life, low-cost and fast-response graphite pencil lead surfactant sensors based on MWCNTs.

SOLID-PHASE MICROEXTRACTION DETERMINATION OF ALCOHOL USING PENCIL LEAD*

2001 ◽  
Vol 34 (4) ◽  
pp. 627-634 ◽  
Author(s):  
Zhan Tong ◽  
Lu Guanghan ◽  
Yao Xin
Keyword(s):  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Pencil Lead

Determination of acoustic emissions using panel contribution analysis and scale modeling

2019 ◽  
Vol 155 ◽  
pp. 63-74
Author(s):  
Gong Cheng ◽  
D.W. Herrin ◽  
Jinghao Liu ◽  
John Stencel
Keyword(s):  
Acoustic Emissions ◽  
Scale Modeling ◽  
Contribution Analysis

Determination of hydrodynamic behavior of gas–solid fluidized beds using statistical analysis of acoustic emissions

2009 ◽  
Vol 35 (11) ◽  
pp. 1011-1016 ◽  
Author(s):  
N. Salehi-Nik ◽  
R. Sotudeh-Gharebagh ◽  
N. Mostoufi ◽  
R. Zarghami ◽  
M.J. Mahjoob
Keyword(s):  
Statistical Analysis ◽  
Fluidized Beds ◽  
Acoustic Emissions ◽  
Hydrodynamic Behavior

scholarly journals Inexpensive Bismuth-Film Electrode Supported on Pencil-Lead Graphite for Determination of Pb(II) and Cd(II) Ions by Anodic Stripping Voltammetry

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Karen C. Bedin ◽  
Edson Y. Mitsuyasu ◽  
Amanda Ronix ◽  
André L. Cazetta ◽  
Osvaldo Pezoti ◽  
...  
Keyword(s):  
Supporting Electrolyte ◽  
Anodic Stripping Voltammetry ◽  
Acetate Buffer Solution ◽  
Wastewater Sample ◽  
Film Electrode ◽  
Bismuth Film ◽  
Pulse Technique ◽  
Bismuth Film Electrode ◽  
Pencil Lead

The present work reports the development and application of bismuth-film electrode (BiFE), obtained by in situ method on the pencil-lead graphite surface, for simultaneous Cd(II) and Pb(II) determination at trace levels, as alternative to replace the mercury-film electrodes. Experimental factors, deposition time (td), deposition potential (Ed), and Bi(III) concentration (CBi), were investigated by applying a 23 factorial design using 0.10 mol/L acetate buffer solution (pH 4.5) as supporting electrolyte. The analysis conditions of the differential pulse technique were td = 250 s, Ed = -1.40 V, and CBi = 250 mg L−1. The validation of the method employing BiFE was accomplished by determination of merit figures. The detection limits were of 11.0 μg L−1 for Cd(II) and 11.5 μg L−1 for Pb(II), confirming that proposed method is attractive and suitable for heavy metals determination. Additionally, the BiFE developed was successfully applied for the Cd(II) and Pb(II) determination in wastewater sample of battery industry.

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