Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 2016

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: naturalny zeolit

Sortuj według:

Ogranicz wyniki do:

Adsorpcja wielopierścieniowych węglowodorów aromatycznych ze ścieków komunalnych na naturalnym zeolicie

Chaber P., Gworek B.

Przemysł Chemiczny

2016

T. 95, nr 3

364--368

Aglomeracje miejskie są źródłem wzrastającej ilości ścieków komunalnych zawierających zanieczyszczenia. Dokonano oceny przydatności zeolitu naturalnego zawierającego w swoim składzie heulandyt i klinoptilolit jako sorbentu usuwającego wielopierścieniowe węglowodory aromatyczne (WWA) ze ścieków komunalnych. Przeprowadzone doświadczenia w układzie statycznym i dynamicznym wykazały, że zeolit naturalny jest efektywnym sorbentem WWA w środowisku ścieków komunalnych i może być używany do oczyszczania tych ścieków z WWA, zwłaszcza 5- i 6-pierścieniowych.

A heulandine and clinoptilolite-contg. zeolite (granulation 0.5–1.0 mm) was used as a sorbent in the tests performed under static condition (i) (10 ng, contact time 1 or 24 h) and dynamic condition (ii) (100 g in a column with diam. 70 mm, rate of wastewater flow 20 mL/min, analyses every 5 min). The concn. of 5 and 6 ring polycyclic arom. hydrocarbons in the wastewater, purified under (i) conditions, was reduced after 1 h treatment by 58% and 35% resp., and after 24 h by 52% and 68% resp. Under (ii) conditions, the pollutant concn. after 1 h treatment decreased by 89% and 90%, resp.

Skin Cancer and UV Protection

Tarbuk A., Grancarić A. M., Šitum M.

Autex Research Journal

2016

Vol. 16, no. 1

19--28

The incidence of skin cancer is increasing by epidemic proportions. Basal cell cancer remains the most common skin neoplasm, and simple excision is generally curative. On the other hand, aggressive local growth and metastasis are common features of malignant melanoma, which accounts for 75% of all deaths associated with skin cancer. The primary cause of skin cancer is long exposure to solar ultraviolet radiation (UV-R) crossed with the amount of skin pigmentation and family genetics. It is believed that in childhood and adolescence, 80% of UV-R gets absorbed while in the remaining, 20 % gets absorbed later in the lifetime. This suggests that proper and early photoprotection may reduce the risk of subsequent occurrence of skin cancer. Reducing the exposure time to sunlight, using sunscreens and protective textiles are the three ways of UV protection. Most people think that all the clothing will protect them, but it does not provide full sun screening properties. Literature sources claim that only 1/3 of the spring and summer collections tested give off proper UV protection. This is very important during the summer months, when UV index is the highest. Fabric UV protection ability highly depends on large number of factors such as type of fiber, fabric surface, construction, porosity, density, moisture content, type and concentration of dyestuff, fluorescent whitening agents, UV-B protective agents (UV absorbers), as well as nanoparticles, if applied. For all of these reasons, in the present paper, the results of UV protecting ability according to AS/NZS 4399:1996 will be discussed to show that standard clothing materials are not always adequate to prevent effect of UV-R to the human skin; and to suggest the possibilities for its improvement for this purpose enhancing light conversion and scattering. Additionally, the discrepancy in UV protection was investigated in distilled water as well as Adriatic Sea water.