Temat: nonwoven - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Measurement of Special Shielding Materials at S and C Band Using Improved Free-Space Transmission Technique
Autorzy:: Dvurechenskaya, N.
Zieliński, R. J.
Powiązania:: https://bibliotekanauki.pl/articles/226270.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: nonwoven
fabric
shielding effectiveness
freespace measurements
surface resistivity
Opis:: In this paper we discuss state of the art in the field of shielding materials investigation. Two types of newly manufactured shielding materials (nonwoven and fabric) were measured using improved free-space transmission technique at 2-5 GHz depending on electromagnetic wave (EM) polarization and antenna to specimen distance. Results of shielding effectiveness (SE) evaluation based on measured complex transmission coefficients (S21) were presented and compared with SE measured using coaxial transmission line technique. Also results of surface resistance measurements with the four-probe technique for the test materials are shown.
Źródło:: International Journal of Electronics and Telecommunications; 2011, 57, 3; 329-334
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Effective removal of odors from air with polymer nonwoven structures doped by porous materials to use in respiratory protective devices
Autorzy:: Brochocka, Agnieszka
Nowak, Aleksandra
Panek, Rafał
Kozikowski, Paweł
Franus, Wojciech
Powiązania:: https://bibliotekanauki.pl/articles/1845379.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: activated carbon
zeolites
porous materials
polymer nonwoven structures
mesoporous silica materials
aplication
Opis:: Filtering Respiratory Protective Devices (FRPD) is not typically evaluated for exposure to volatile compounds, even though they significantly affect their protective performance. Such compounds are released into the atmosphere by industrial processes and pose serious health risks in people inhaling them. The adsorbent materials currently used to prevent those risks include activated carbon (AC). Zeolites and mesoporous silica materials (MCM) are very popular among the sorption materials. Due to their physical and chemical properties, they are able to adsorb significant amounts of volatile compounds from air. The melt-blown technology was used to produce filtering nonwovens with modifiers. As a result, polymer nonwoven structures with modifiers in the form of AC, zeolite (NaP1 type), molecular sieves (SM, SM 4Å) and mesoporous silica materials (MCM-41) were produced. The use of ACs (AC1 from Zgoda and AC2 from Pleisch) and their mixtures with others modifiers allowed to obtain satisfactory sorption, protective and utility properties. The longest breakthrough time against cyclohexane (approx. 53 min) was afforded by a variant containing AC, against ammonia (approx. 12 min) for the variant with AC2 and a mixture of AC2 and MCM-41. In the case of acetone vapor satisfactory breakthrough times were found for the variants with AC2 and AC1+SM (~20–25 min.). The present work deals with scientific research to improve workers’ and society’s health and safety by pursuing a better working life, and creating a safe social environment.
Źródło:: Archives of Environmental Protection; 2021, 47, 2; 3-19
2083-4772
2083-4810
Pojawia się w:: Archives of Environmental Protection
Dostawca treści:: Biblioteka Nauki

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