scholarly journals Determination of beam characteristics by its vibration measurement

1995 ◽  
Vol 17 (3) ◽  
pp. 27-38
Author(s):  
Nguyen Cao Menh ◽  
Tran Trong Toan
Keyword(s):  
Inverse Problem ◽  
Analytical Method ◽  
Transverse Vibration ◽  
Vibration Measurement ◽  
Computational Program ◽  
Beam Characteristics ◽  
Free Beam

On the basis of analyzing the transverse vibration of a clamped-free beam, in this paper an inverse problem is investigated. The analytical method· and computational program me have been presented for determination of the length of the beam when vibrations at some points on the beam with external distribution excitation or vibration at one point with some excited frequencies are measured. The obtained results from the illustration examples described in the paper give us the procedure for selecting one solution in multi-solution inverse problem.

Determination of beams's parameters with lumped mass by using measurement data of vibrations

1996 ◽  
Vol 18 (2) ◽  
pp. 20-28
Author(s):  
Nguyen Cao Menh ◽  
Tran Trong Toan
Keyword(s):  
Inverse Problem ◽  
Numerical Method ◽  
Transverse Vibration ◽  
Measurement Data ◽  
Lumped Mass ◽  
Common Solution ◽  
The Common ◽  
Lumped Masses ◽  
Free Beam

In this paper the transverse vibration of the clamped-free beam with lumped mass is investigated. From that the inverse problem for determining the length of the beam on the basis of measurement data of beam’s vibration with changing mass is solved by numerical method. The computer programs for the problem are to be applied to some examples and the obtained results are acceptable. The common solution for problems with different lumped masses is chosen as desirable result.

LUMINESCENT DETERMINATION OF SUGAR IN NATURAL HONEY

2020 ◽  
Vol 0 (4) ◽  
pp. 29-32
Author(s):  
B.M. GAREEV ◽  
◽  
A.M. ABDRAKHMANOV ◽  
G.L. SHARIPOV ◽  
◽  
...  
Keyword(s):  
Quantum Dots ◽  
Laboratory Test ◽  
Aqueous Solutions ◽  
Analytical Method ◽  
Sugar Content ◽  
Carbon Quantum Dots ◽  
Photoluminescence Intensity ◽  
Sucrose Content ◽  
Natural Honey

The photoluminescence of carbon quantum dots synthesized from natural honey and mixtures of honey and sugar has been studied. An increase in the sugar content leads to a decrease in the photoluminescence intensity without changing the shape of the luminescence spectrum of these quantum dots aqueous solutions, which is associated with a decrease in the yield of their synthesis in the sugar presence. The discovered effect can be used to detect sugar in honey. When examining five different market samples of flower honey using this method, two of them showed a significant decrease in the photoluminescence intensity. A laboratory test for compliance with GOST 19792-2017 Standard requirements established an excess of the sucrose content in these samples. Luminescent determination of sugar in honey does not require complicated equipment and can be used to develop a new analytical method for determining the sugar content in counterfeit natural honey.

scholarly journals Rapid Analytical Method for the Determination of 220 Pesticide with Their Isomers by GCMS-TIC

2021 ◽  
Author(s):  
Mohamed H. EL-Saeid ◽  
Ashraf S. Hassanin ◽  
Abdulqader Y. Bazeyad ◽  
Norhan M. Hamza
Keyword(s):  
Analytical Method

Green analytical method for the determination of sofosbuvir, ledipasvir, ribavirin and complex silymarin flavonoids simultaneously in biological fluids

2021 ◽  
Vol 164 ◽  
pp. 105964
Author(s):  
Amira F. El-Yazbi ◽  
Yasmine Khalifa ◽  
Mohammed A.W. Elkhatib ◽  
Ahmed F. El-Yazbi
Keyword(s):  
Analytical Method ◽  
Biological Fluids
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