Lead and Cadmium Elements Detected in Milk Samples from Local Markets in Baghdad

Jabbar Faleh Fadhil; Maha A. Gathwan

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Publication Date

Sun Aug 07 2022

Journal Name

Chemical Methodologies

Volume

6

Issue Number

8

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Lead and Cadmium Elements Detected in Milk Samples from Local Markets in Baghdad

Local markets

Powder milk

Liquid milk

Heavy metals

Atomic flame absorption

Baghdad city

Jabbar Faleh Fadhil

Maha A. Gathwan

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Chemical Methodologies (CHEMM)

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Publication Date

Fri Mar 01 2019

Journal Name

Applied Acoustics

Theoretical model of absorption coefficient of an inhomogeneous MPP absorber with multi-cavity depths

Micro-perforated panel (MPP) absorber has been known as an alternative absorber to classical porous material given its facile installation

long durability

environmental friendliness and attractive appearance. Extensive studies of MPP absorber proposing the improvement of its absorption frequency bandwidth have been published. This study presents a MPP absorber introduced with inhomogeneous perforations and with multi-cavity depths. The MPP is divided into two sub-area

where each area has different hole diameter

perforation ratio and a separated backed cavity depth. The acoustic impedance is modelled using electrical equivalent circuit and the absorption coefficient is calculated under normal-incidence of sound. It is found that the inhomogeneous MPP can have good bandwidth of absorption by designing the sub-MPP of smaller perforation ratio with large hole diameter and the one having the larger perforation ratio with smaller hole diameter. The absorption bandwidth can be conveniently controlled by adjusting the cavity depth of each sub-MPP. The results from the experimental work show good agreement with the theoretical model.

Ali Ibrahim

Azma

Roszaidi

Iwan

Al-Ameri

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