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Register a new userدراسة تجهيز أقمشة مقاومة للأشعة فوق البنفسجية
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Aِl-Baath University رسالة ماجستير
Publication date
2019
and research's language is
العربية
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Shamra Editor
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تقدم المنسوجات أفضل طريقة للحماية من التعرض للأشعة فوق البنفسجية بما فيها الملابس والقبعات والمظلات . تعتبر الأصبغة الطبيعية من الأصبغة الصديقة للبيئة والتي تحد من تلوث المياه إلى حد كبير مقارنة بالأصبغة التركيبية .
Textiles, including clothing, hats, and umbrellas, offer the best way to protect against exposure to UV rays. Natural dyes are environmentally friendly dyes that reduce water pollution to a large extent compared to synthetic dyes.
References used
Vankar P. Natural dves for textiles. Elsevier Ltd. 2017
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This study includes an experimental work to determine the effect of ultraviolet radiation (uv-rays) on the mechanical behavior of the conveyor rubber vulcanizing, which used in various transport operations, and in the cement plant Tartus. In this wor
k, it has been prepared different samples of belts, and they were exposed to uv radiation at differente times, then they were tested to know its wear and tensile strength.
The results were compared with samples similar to the samples tested, which was not exposed to the rays of UV, and with other samples exposed to temperatures, and that in order to reach the ideal conditions for the use of these belts, which ensures longer period of use and safe conditions. This study showed that uv-rays increase the average of wear and the tensile strength of belts.
The study was conducted during 2017 in the laboratories of the department of Botany
at Tishreen University, Lattakia, Syria. The effect of ultraviolet radiation (UV-C and UVB)
for different periods (0.5, 1, 3, 5, 15, 15, 30, 45, 60 minutes) on the
photosynthetic
pigments of Euglena gracilis (with three stages of measurements) was studied. The results
showed that chlorophyll pigments were more sensitive to UV-C compared to UV-B. These
reductions were correlated with the increase in the exposure time, reaching the lowest
value after 60 minutes exposure (97.83, 98.73, 99.18% for chlorophyll a, chlorophyll b and
carotenoids when measured after 24 hours respectively).
The polyethylene films protect the chlorophyll pigments against UV radiation.
The protection rate was more evident against UV-C reaching .7.7% after 24 hours in the
algae exposed for 30 minutes according to the experimental conditions.
This study discusses in-duct UVGI efficiency to disinfect O.R and ICU supplied air. Experiment
setup was designed using three ultraviolet lamps were placed at the upper side of experimental duct,
equipped with variable speed turbine to simulate flo
w rates of ICU and O.R. In order to determine
organism irradiance time, UV intensity distribution is measured at different levels in duct, Thenthese
parameters combined in simulation program executed under LABVIEW programming environment to
determine in-duct disinfection efficiency in relation to ICU and O.R designing requirement and sterility
level.
Objectives: This study aims to assess the efficacy of UVBnb phototherapy alone,
and with methotrexate in plaque psoriasis, and comparing the side effects and relapse
between the two kinds of treatments.
Study Design: randomized experimental study.
Methods: A total of 40 psoriasis patients were included in the study, 16 patients
were treated with UVBnb and methotrexate, whereas 24 patients were treated with
UVBnb alone. PASI was calculated for every patient every 2 weeks through treatment, and
every 4 weeks after clearance. Side effects and relapse were compared between two kinds
of therapy.
Results: there were no statistical important differences between two groups of study
according to clearance, clearance rate in combination group was 75% vs. 46% in
phototherapy group, tanning and hyperpigmentation were the most common side effects
for both groups, recurrence rate was 22.7% in study patients, all of them were from
phototherapy group.
Conclusion: this study revealed that UVBnb phototherapy alone,and with
methotrexate have the same efficacy in the treatment of psoriasis, and the combined
therapy with methotrexate reduce the number of UVBnb treatments necessary for
clearance. Side effects were tolerated in both kinds of treatments. Relapse after clearance
occurs more likely with alone UVBnb phototherapy.
The Lee code is applied to characterize the plasma focus in two
plasma focus devices UNU/ICTP PFF and Amirkabir plasma focus
device (APF),
and for optimizing the nitrogen soft x-ray yields based on bank,
tubes and operating parameters. It is foun
d that the soft x-ray yield
increases with changing pressure until it reaches the maximum
value for each plasma focus device, with keeping the bank
parameters, operational voltage unchanged but systematically
changing other parameters.
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