A calculation procedure for the determination of the collection efficiency in annular denuders

Arapid, simple, and sensitive procedure based on modified solid phase extraction was developed for the pre-concentration and determination of trace amount of lead in water resources. Lead was reacted with ammonium pyrrolidinedithiocarbamate (APDC) to make a complex. The complex was then collected in a column packed with surfactant-coated alumina. The parameters affecting the collection efficiency and desorption rate of the lead complexes from the column were investigated and optimized. The collection efficiency of the lead complex on the adsorbent was excellent under the optimized conditions. The results obtained from the recovery test showed the capability and reliability of the method for the analysis of trace amounts of lead. The proposed pre-concentration procedure made it possible to apply conventional flame atomic absorption spectrometry (FAAS) for the sensitive determination of trace amounts of lead in water resources. .

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Determination of Plasticity for Pre-Deformed Billet

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.291.110 ◽

2019 ◽

Vol 291 ◽

pp. 110-120

Author(s):

Olena Solona ◽

Iryna Derevenko ◽

Igor Kupchuk

Keyword(s):

Mathematical Model ◽

Damage Accumulation ◽

Mechanical Characteristics ◽

Calculation Procedure ◽

Fracture Model ◽

Pipe Extrusion ◽

High Level ◽

The Mathematical Model ◽

Extrusion Method

The calculation procedure for determining the plasticity of pre-deformed metals during their processing by pressure has been developed. The calculation procedure is based on a fracture model, which in turn is based on the tensor description of damage accumulation. With known mechanical characteristics, as well as with known plasticity diagrams, the fracture model makes it possible to evaluate the plasticity of pre-deformed bend for any kind of stress state. When manufacturing steeply curved branches using the pipe extrusion method, the procedure was tested. Verification of the mathematical model has shown a high level of its adequacy, and it can be used in assessing the plasticity of pre-deformed billet.

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Numerical determination of electrically enhanced fiber collection efficiency

Journal of Aerosol Science ◽

10.1016/0021-8502(83)90033-2 ◽

1983 ◽

Vol 14 (2) ◽

pp. 87-97 ◽

Cited By ~ 4

Author(s):

D.O. Banks ◽

M.S. Hall ◽

G.J. Kurowski

Keyword(s):

Collection Efficiency ◽

Numerical Determination ◽

Electrically Enhanced

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Improved Gasket Testing

Volume 2: Computer Technology and Bolted Joints ◽

10.1115/pvp2013-97941 ◽

2013 ◽

Author(s):

Manfred Schaaf

Keyword(s):

Calculation Procedure ◽

Testing Procedures ◽

Working Groups ◽

European Standards ◽

Gasket Material ◽

Definition Of

At present, the European Standards EN 1591-1 which is used for the calculation of bolted flanged joints and EN 13555 in which the determination of the required gasket characteristics are defined are under revision. Several studies on gasket testing and on flange calculation have been performed in order to verify the suggested modifications of the standardization working groups. As a result of these studies several optimizations in respect of the testing procedures, the definition of the gasket characteristics and the calculation procedure can be derived. In this paper, additional or modified gasket characteristics such as the stiffness-independent gasket deflection, caused by creep of the gasket material or formulas for the description of the gasket compression curves, are presented. Several tests with diverse gasket materials were performed in order to generate generally admitted procedures to determine these required characteristics which are the basis for the advanced calculation procedure which will be presented in a second paper.

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