Wyniki wyszukiwania - BazTech

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Investigations of Single and Multilayer Structures Using Lock-In Thermography - Possible Applications

Gralewicz G., Owczarek G., Więcek B.

International Journal of Occupational Safety and Ergonomics

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2005

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Vol. 11, No. 2

211--215

EN

This paper presents a study of the possibilities of evaluating thermal parameters of single and multilayer structures using dynamic thermography. It also discusses potential uses of lock-in thermography. It presents a simulation of a periodic excitation of a multilayer composite material. In practice, the described methods can be employed in various applications, for example, in multilayer nonwoven microelectronic components manufactured from hemp fibers, chemical fibers, with an addition of electrically conducting fibers, and in medicine and biology. This paper describes tests conducted with lock-in thermography on carbon fibre reinforced composites with implanted delamination defects. Lock-in thermography is a versatile tool for non-destructive evaluation (NDE). Lock-in thermography is a fast, remote and non-destructive procedure. Hence, it has been used to detect delaminations in the composite structure of aircraft. This method directly contributes to an improvement in safety.

2

Deposition and Resuspension of Selected Aerosols Particles on Electrically Charged Filter Materials for Respiratory Protective Devices

Makowski K.

International Journal of Occupational Safety and Ergonomics

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2005

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Vol. 11, No. 4

363--376

EN

The primary aim of the study was to analyse the non-steady state of filtration for selected electrostatic filter materials designed for use in respiratory protective devices. The obtained results showed that the filtration process in electrostatic filters was dependent in the main on the following factors: type of the filter material, electrostatic field strength of the material, and the charge of the aerosol. To a lesser degree the filtration process depended on the sign of the charge and the relative humidity of the air. A significant correlation was found between the increase in the penetration and the decrease in reathing resistance while the filter was being loaded. The effect of resuspension (tearing off and re-deposition of dust agglomerates inside the filter) on the filtration process very significant. It was also observed that under certain conditions electrostatic filter materials lost their protection properties.

3

Permeability of Medical Gloves to Mono- and Dimethacrylate Monomers in Dental Restorative Materials

Lonnroth E. C., Ruyter I. E.

International Journal of Occupational Safety and Ergonomics

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2002

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Vol. 8, No. 4

497--509

EN

Dental personnel manually handle methacrylate-based restorative materials, which can cause skin irritation and allergies. The protection given by different types of medical gloves is not well known. Breakthrough time (BTT, min) was used as a measure of protection according to a European standard, using 2 test mixtures consisting of respectively 3 and 5 monomers. Fourteen gloves representing natural rubber latex, synthetic rubber, and synthetic polymeric material were tested. The BTT ranged from some minutes to more than 2 hrs for the 4 monomers with a molecular mass less than 300. The longest protection was recorded for Nitra Touch (nitrile rubber), Tactylon (synthetic rubber), and Metin (PVC).

4

Własności elektrostatyczne odzieżowych materiałów powlekanych

Ruszkowski K., Krzemińska S.

Bezpieczeństwo Pracy : nauka i praktyka

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1999

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nr 4

15-19

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Spektrofotometryczna analiza barw wybranych ochron osobistych

Pościk A., Kubacki Z., Owczarek G.

Bezpieczeństwo Pracy : nauka i praktyka

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1998

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nr 2

2-5