Wyniki wyszukiwania - Biblioteka Nauki

1

Promieniowanie nadfioletowe - zasady zapobiegania negatywnym skutkom zdrowotnym

100%

Łastowiecka-Moras E. , Bugajska J.

Bezpieczeństwo Pracy : nauka i praktyka

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2008

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tom nr 11

21-23

PL

Promieniowanie nadfioletowe (UV) może mieć pozytywne i negatywne skutki dla organizmu człowieka. Korzystny wpływ nadfioletu to przede wszystkim jego działanie przeciwkrzywicze. Do szkodliwych skutków działania UV należy zaliczyć przede wszystkim, fotostarzenie się skóry oraz nowotwory skóry, a w obrębie narządu wzroku zaćmę. Promieniowania nadfioletowego nie można uniknąć, trzeba jedynie nauczyć się, jak skutecznie się przed nim zabezpieczyć. Osoby z fototypem skóry I, niemowlęta i dzieci oraz osoby z licznymi znamionami powinny w szczególności unikać promieniowania nadfioletowego. Pozostałe osoby (z fototypem II, III i IV) powinny racjonalnie korzystać z kąpieli słonecznych, stosując odpowiednie środki ochrony. Dotyczy to zwłaszcza osób wykonujących pracę zawodową na otwartej przestrzeni, narażonych na działanie UV.

EN

Ultraviolet radiation (UV) can have positive and negative effects on the human body. Its role in Vitamin D production is a primary positive effect. Harmful effects of UV radiation are, first of all, photoaging of the skin as well as skin cancers, and in the area of vision, cataracts. Because we cannot avoid ultraviolet radiation, we should learn how we can effectively protect ourselves against it. In particular, persons with skin phototype I, infants and children, as well as persons with numerous birthmarks should avoid ultraviolet radiation. Other persons (phototype II, III and IV) can sunbathe with suitable protection. This especially concerns outdoor workers exposed to UV radiation.

2

Comparative Analysis of the Effectiveness of Reverse Osmosis and Ultraviolet Radiation of Water Treatment

100%

Dirisu G. B. , Okonkwo U. C. , Okokpujie I. P. , Fayomi O. S. I.

Journal of Ecological Engineering

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2019

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tom Vol. 20, nr 1

61--75

EN

Water contamination and pollution pose health hazards to humanity and hence the need for their treatment. This study compared reverse osmosis (RO) and ultra-violet (UV) radiation in treating borehole water (BHW) and surface water (SW). The study area is Omoku community in Rivers State of Nigeria. The RO- and UV-treated waters were determined by their physicochemical characteristics and total Coliform, with the control to check the impact of each one. The obtained results showed slight variations, which were either significant or not. The pH of the treated BHW was slightly acidic with the value of 6.52. Water conductivity ranged from 40.33 µs/cm3 to 42.40 µs/cm3 for the BHW treated with RO, UV and control samples, respectively. SW conductivity attained a range of 425.07–800.0 µs/cm3. Turbidity of BHW were beyond the detectable limit but was higher than the WHO limit of <5.00NTU, while total suspended solid (TSS) of SW ranged from 9.08–46.43 ppm. Total dissolved solids (TDS) values of water were between 3.50 ppm and 16.67 ppm for RO treated BHW and higher than that of SW. There was a reduction of salinity of BHW from 40.7 mg/l to 11.8 and 21.6 mg/l following RO and UV treatment, while SW salinity was also reduced from 75.0 mg/l to 20 mg/l in RO treated water and 16 mg/l in UV treated water. In this study, RO and UV water treatment proved to be effective in producing potable water from both BHW and SW, although RO seemed to produce water with reduced mineral content in comparison to the UV treatment. Both methods effectively reduced heavy metals as well as Coliform. The physicochemical parameters tested were below the WHO recommended limits in most cases. It is recommended that both methods be incorporated in a single WT in order to gain the benefits of both technologies.

3

UV Radiation Detection Using Optical Sensor Based on Eu3+ Doped PMMA

100%

Miluski P. , Kochanowicz M. , Żmojda J. , Dorosz D.

Metrology and Measurement Systems

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2016

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tom Vol. 23, nr 4

615--621

EN

Progress in UV treatment applications requires new compact and sensor constructions. In the paper a hybrid (organic-inorganic) rare-earth-based polymeric UV sensor construction is proposed. The efficient luminescence of poly(methyl) methacrylate (PMMA) matrix doped by europium was used for testing the optical sensor (optrode) construction. The europium complex assures effective luminescence in the visible range with well determined multi-peak spectrum emission enabling construction of the optrode. The fabricated UV optical fibre sensor was used for determination of Nd:YAG laser intensity measurements at the third harmonic (355 nm) in the radiation power range 5.0-34.0 mW. The multi-peak luminescence spectrum was used for optimization of the measurement formula. The composition of luminescent peak intensity enables to increase the slope of sensitivity up to -2.8 mW-1. The obtained results and advantages of the optical fibre construction enable to apply it in numerous UV detection systems.

4

Influence of UV radiation on the color of furfurylated wood protected with refining coatings

100%

Jaglowski K. , Marchwicka M.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

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2023

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tom 121

5

Estimation of crop plants susceptibility to UV-B radiation

100%

Skorska E.

Polish Journal of Natural Sciences. Supplement

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2003

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tom 01

6

Effect of increased UV-B radiation on conifer metabolism

100%

Kozlowska M. , Pukacki P. , Brzezinska E. , Rybus-Zajac M.

Polish Journal of Natural Sciences. Supplement

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2003

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tom 01

7

The influence of melanin on the process of lipid peroxidation. Part 1. The influence of melanin on photo-induced lipid peroxidation

88%

Ezzahir A.

Applied Biology Communications. Lublin Scientific Center

|

1991

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tom 01

|

nr 6

8

Visual Quality and Morphological Responses of Rosemary Plants to UV-B Radiation and Salinity Stress

88%

Hamidi-Moghaddam A. , Arouiee H. , Moshtaghi N. , Azizi M. , Shoor M. , Sefidkon F.

Journal of Ecological Engineering

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2019

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tom Vol. 20, nr 2

34--43

EN

In order to understand the effects of ultraviolet-B (UV-B) radiation and salinity stress on the visual quality and morphological parameters, one-year-old seedlings of rosemary (Rosmarinus officinalis L.) were grown under three UV-B levels (0, 4.32, 6.05 kJ m-2 d-1) and four salinity regimes (Control, 50, 100 and 150 mM NaCl) under greenhouse conditions. The results showed that enhanced UV-B radiation increased visual quality, growth index, plant biomass, shoot/root ratio, number of branches and leaves, leaf fresh and dry weight, leaf area index, specific leaf area, leaf thickness. The UV-B radiation had no significant effect on root length; however, shoot height, length of axillary shoots, length of inter node, leaf area, leaf length and width and concentration of chlorophyll b were negatively impacted by the UV-B radiation. On the other hand, salinity caused a significant decrease in plant biomass, root length, shoot height, shoot/root ratio, length of axillary shoots, length of inter node, number of branches and leaf area, leaf area index, leaf length and width, leaf fresh and dry weight, specific leaf area and concentration of Photosynthetic pigments. However, the number leaves and leaf thickness significantly increased under NaCl salinity treatments. Visual quality and growth index were hardly affected by increasing salinity until 100 mM, but declined clearly at 150 mM NaCl salinity. The interaction between UV-B irradiation and salinity showed that pre-treatment with UV-B irradiation alleviated the harmful effects of NaCl and improved the visual quality rosemary plants.

9

Photosynthetic responses of Chlorella vulgaris L. to short-term UV-B radiation exposure

88%

Skorska E. , Murkowski A.

Acta Biologica Cracoviensia. Series Botanica

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2018

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tom 60

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nr 1

10

Dynamics of photosynthetic and oxidative stress parameters of two spinach species after short-term low UV-B radiation effect

88%

Januskaitiene I. , Sakalauskiene S.

Acta Scientiarum Polonorum. Hortorum Cultus

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2019

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tom 18

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nr 1

EN

This work aimed to underline the dynamics of photosynthetic and oxidative stress parameters of ‘Matador’ and ‘Andromeda’ spinach species after short-term 1 and 2 kJm–2 UV-B radiation effect. When plants reached 3–4 leaves growths stage, the exposure to 1 kJm–2 and 2 kJm–2 UV-B radiation was done once for 68 and 136 minutes, respectively. The photosynthetic and oxidative stress parameters were determined 2, 24, 48 and 72 hours after exposure. The stimulating effect of UV-B emerged on the 3rd day after exposure. The positive effect of UV-B was more pronounced for ‘Matador’. The highest DPPH radical-scavenging capacity and the highest concentration of α-tocopherols were detected 24 hours after 2 kJ UV-B exposure, but the decrease in photosynthetic rate was the highest as well. Meanwhile, on the 3rd day after 1 kJ UV-B exposure, the indicators of oxidative stress of ‘Matador’ decreased, and the photosynthetic rate increased. This study highlights that low UV-B radiation acts as an eustress, by awaking positive changes in photosynthetic and oxidative stress parameters of spinach.

11

Wpływ promieniowania ultrafioletowego na stan powierzchni powłok akrylowych

88%

Majewski M.

Logistyka

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2010

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tom nr 6

PL

W artykule przedstawiono wpływ promieniowania ultrafioletowego na właściwości powłok akrylowych. Przedstawiono wyniki pomiarów: grubości, twardości, wartości parametru Ra chropowatości powierzchni oraz połysku zwierciadlanego powłok dla różnych okresów ich starzenia. Zaobserwowano zmniejszenie grubości i połysku powłok oraz zwiększenie ich twardości i chropowatości.

EN

This article presents the influence of ultraviolet radiation on the features of acrylic coatings. The results of measures of coatings thickness, their hardness, value of Ra surface parameter and bright polish for the different ageing time were shown. The decrease of thickness and bright polish along with the increase of their hardness and roughness were observed.

12

Fluorescence optical analysis method for assessing homogeneity of granular mixtures

88%

Matuszek D. B. , Królczyk J. B.

Metrology and Measurement Systems

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2021

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tom Vol. 28, nr 1

41--54

EN

This paper presents a method of optical fluorescence analysis for the evaluation of homogeneity of multicomponent grain mixtures. This method is based on the evaluation of the content of fluorescent marker. Maize with two degrees of fineness d1 = 1.25 mm and d2 = 2.00 mm was used as a tracer. Maize was covered with Rhodamine B, which emits red light under the influence of ultraviolet radiation. The tracer was introduced into the mixture before the mixing process began. Nine multicomponent grain mixtures were used. The proportion of fluorescent maize was evaluated on the basis of computer image analysis. Additionally, the fraction of the tracer was evaluated using a control method (validation of the accuracy of the proposed method). The results indicate that the degree of the tracer’s fineness influences the results obtained. The use of fluorescent maize with particle size d2 = 2.00 mm allowed to obtain results which differed less from the control method. The average size of the difference in results ranged from 0.20-0.38 for the 2.00 mm tracer and 0.38-1.34 for the 1.25 mm tracer.

13

Coupled action of ozone and UV radiation towards obtaining adipic acid from cyclohexane/one

88%

Marek A. A. , Lisicki D.

Polish Journal of Chemical Technology

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2024

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tom Vol. 26, nr 1

97--101

EN

A lot of research is constantly underway in the world to develop new or improve the current processes of the chemical industry to make them more effective and environmentally friendly. The described research on the oxidation of cyclohexane or cyclohexanone to adipic acid with a coupled action of UV radiation and oxygen–ozone mixture, instead of the currently used oxidation with HNO3, is part of this trend. Gas chromatography was used to determine process indicators, such as cyclohexane conversion and selectivity to AA, which exceeded 50% at 25°C, after 16 h. This method can also be used for the preparation of other dicarboxylic acids from cycloalkanes, which proves its universal character.

14

The research and analysis of the bactericidal properties of the spacer knitted fabric with the UV-C system

88%

Łada-Tondyra E. , Jakubas A. , Jabłońska B. , Stańczyk-Mazanek E.

Opto-Electronics Review

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2021

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tom Vol. 29, No. 4

192--200

EN

The research and analysis of the bactericidal properties of the spacer knitted fabric with the UV-C system are presented in this paper. The disintegration factor affecting the bacteria in the knitted fabric is the UV-C radiation in the range of 265–270 nm distributed via woven optical fibres. The way of integrating elements of the system generating the UV-C radiation in the structure of the spacer knitted fabric was designed, as well as various configurations of optical fibres arrangement, fibre density, number of radiation sources, and diode types were tested. The material was contaminated with selected microorganisms indicative of sanitary contamination and important in terms of nosocomial infections. The scope of the research included microbiological (quantitative and qualitative) analyses of selected taxonomic groups of microorganisms (mesophilic bacteria, fungi, actinomycetes) before and after the irradiation process. The analysis of the research results and the applied modification of the knitted fabric turned out to be effective in reducing the amount of potentially pathogenic microorganisms.

15

Survival of pigmented freshwater zooplankton, exposed to artificial ultraviolet radiation and two levels of dissolved organic carbon

88%

Ríos P.

Polish Journal of Ecology

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2005

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tom Vol. 53, nr 1

113-116

EN

The increase in penetration of ultraviolet radiation has been reported currently over southern South America. It would affect the photoprotective responses in biotic elements of freshwater ecosystems. An experiment was designed using pigmented adult individuals of the species Daphnia dadayana (Paggi 1999), Boeckella antiqua (Menu-Marque & Balseiro 2000), and Parabroteas sarsi (Mrázek 1901), characteristic for shallow fishless ponds from South American plaints (located between 41 and 53° S latitude). The artificial ultraviolet radiation was involved in the experiment, with two levels of dissolved organic carbon (DOC), which would exert a protective effect against ultraviolet radiatiion. The results of this experiment showed that under conditions of low DOC concentrations, D. dadayana recorded a higher mortality, while under low DOC concenttrations, B. antiqua and P. sarsi were not affected by ultraviolet radiation. Daphnids would be less tolerant to the exposure to ultraviolet radiation than pigmented calanoid copepods.

16

Modification of the surface of collagen films by UV radiation

88%

Sionkowska A.

Current Topics in Biophysics. Supplement

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2011

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tom 34

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nr A: Plenary lectures

17

Concentrations of silica on the surface of Equisetum arvense following enhanced UV radiation treatment

88%

Zobel A. , Wierzchowska-Renke K. , Dorosz A. , Lukasiak J.

Ochrona Środowiska i Zasobów Naturalnych

|

1999

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tom 18

18

Colour change caused by UV light in wenge wood after impregnation with water, acid and alkaline buffers

75%

Stachowiak-Wenecka A. , Zborowska M. , Waliszewska B. , Pradzynski W. , Nowaczyk-Organista M.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

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2013

|

tom 84

19

Absorbery promieniowania ultrafioletowego zwiększające właściwości ochronne wyrobów włókienniczych

75%

Czajkowski W. , Paluszkiewicz J.

Przemysł Chemiczny

|

2008

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tom T. 87, nr 10

1029-1034

20

Economic aspects of application of decorative wood coatings and their effectiveness

75%

Cofta G. , Dreger B.

Intercathedra

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2013

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tom 29

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nr 4

EN

The paper presents results of mycological tests and accelerated ageing tests for 13 commercially available decorative coatings in relation to costs of their purchase. Mycological tests with the use of A. niger showed that only four preparations protect spruce wood against attack of the test fungus. None of the coatings was resistant to the destructive effect of UV radiation. Testing results of resistance against A. niger attack and accelerated ageing were compared relative to purchase costs of the applied preparations. It was found that the most advantageous preparations were those with medium efficacy and of low prices. However, for the comprehensive economic analysis of the application of tested decorative coatings it is required to consider costs of coating application and surface renovation.