Wyniki wyszukiwania - Biblioteka Nauki

1

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

100%

Makowski K.

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tom 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.

2

Steady-state investigation of the single-phase capacitor induction motor

63%

Makowski K. , Wilk M.

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tom R. 88, nr 2

180-183

EN

The paper presents steady-state study of the single-phase capacitor induction motor by of 2D field-circuit model and by an actual motor laboratory testing. Developed the field-circuit model was implemented for simulation using Flux2D software package. The investigation of the motor was conducted for steady-state performance with no-load and locked-rotor tests. Computed steady-state characteristics were compared with measured ones to confirm correctness of the simulation model.

PL

Artykuł przedstawia badania stanu ustalonego pracy jednofazowego silnika indukcyjnego z pomocniczym uzwojeniem kondensatorowym za pomocą dwuwymiarowego modelu polowo-obwodowego oraz pomiarów laboratoryjnych rzeczywistego silnika. Model polowoobwodowy silnika opracowano przy wykorzystaniu pakietu Flux2D. Badania silnika przeprowadzono w stanie pracy ustalonej pod obciążeniem, biegu jałowym oraz przy zahamowanym wirniku. Obliczone charakterystyki w stanie ustalonym porównano z wynikami pomiarowymi dla sprawdzenia poprawności przyjętego modelu polowo-obwodowego.

3

Ocena komfortu użytkowania wybranych modeli środków ochrony indywidualnej z wykorzystaniem techniki 3D

51%

Makowski K. , Brochocka A. , Irzmańska E.

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tom nr 9

14-19

PL

W artykule przedstawiono badania komfortu użytkowania obuwia roboczego, masek i półmasek indywidualnie dopasowanych do kształtu ciała użytkownika. Do wykonania modeli środków ochrony indywidualnej wykorzystano technikę cyfrowego odwzorowania 3D. Tak uzyskane modele poddano ocenie komfortu użytkowania, porównując je ze standardowymi wyrobami dostępnymi na rynku. W wyniku badań stwierdzono, ze indywidualne dopasowanie SOI zmodyfikowanych z wykorzystaniem cyfrowego odwzorowania wymiarów antropometrycznych znacząco wpływa na poprawę komfortu ich użytkowania.

EN

This article presents a study on the comfort of footwear, masks and respirators individually fitted to the shape of the human body 30 digital mapping was used to make models of personal protective equipment [PPE].Thus obtained models were evaluated for comfort by comparing them with standard products available on the market. The results showed that individual adjustment of PPE modified with digital mapping of anthropometric measurements significantly improved the comfort of their use.

4

Efficiency of Filtering Materials Used in Respiratory Protective Devices Against Nanoparticles

51%

Brochocka A. , Makowski K. , Majchrzycka K. , Grzybowski P.

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tom Vol. 19, No. 2

285--295

EN

The basic aim of this research was to establish the efficiency of filtering materials widely used in respiratory protection devices with particular interest in their porosity, degree of electric and changeable process parameters, such as the flow rate of the test nanoaerosol and the size range of nanoparticles. Tests were carried out with an NaCl solid aerosol of 3.2 × 105 particles/cm3 for the range of particle size of 7–270 nm, at aerosol flow rate of 1800, 2700, 3600, 4500 and 5400 L/h. The tests showed that electrospun nonwovens were the most effective filtering materials for nanoparticles over 20 nm. Melt-blown electret nonwovens with lower porosity than electrospun nonwovens had higher values of penetration of 1%–4%. Those materials provided very efficient protection against nanoparticles of certain sizes only.