Subscribe to the gold package and get unlimited access to Shamra Academy
Register a new userUltraviolet Usage Efficiency of in Supporting Particulate Filters to Disinfect Re-Circulated Air in Both ICU And O.R Rooms
فعالية استخدام الأشعة فوق البنفسجية في دعم الفلاتر الجزيئية لتطهير الهواء المعاد تدويره في كل من غرف العمليات و العناية المشددة
953
1 43
0
(
0
)
Added by
Damascus University ورقة بحثية
Publication date
2012
fields
Medical Device Engineering
and research's language is
العربية
Created by
Shamra Editor
Ask ChatGPT about the research
تبحث هذه الدراسة في فعالية الأشعة فوق البنفسجية في تطهير الهواء المتدفق عبر مجاري التهوية إلى كل من غرف العمليات و العناية المشددة, إِِذ صممت منصة تجربة ثبت من خلالها ثلاثة مصابيح أشعة فوق بنفسجية في المنطقة العلوية من مجرى تهوية مزود بمروحة ذات معدل ضخ متغير يحاكي معدلات تدفق كل من غرف العمليات و العناية المشددة, لتحديد زمن تعرض الكائنات المجهرية للأشعة, ثم قِيس توزع كثافة الأشعة عند عدة مستويات ضمن المجرى, ثم ربطت هذه العوامل مع بعضها بعضاً عبر برنامج حاسوبي نُفِّذَ بواسطة بيئة LABVIEW البرمجية بهدف تحديد فعالية تطهير الهواء المتدفق إلى غرف العناية المشددة و العمليات اعتماداً على المتطلبات التصميمية و مستوى العقامة.
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 flow 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.
References used
Griffiths W.D., Bennett A., Speight S., Parks S. “Determining the performance of a commercial air purification system for reducing airborne contamination using model microorganisms: a new test methodology”,Journal of Hospital Infection, 2005, Vol. 61, P.P:242–247
Kowalski, W.J., and Bahnfleth, W.P.“Proposed Standards and Guidelines for UVGI Air Disinfection”, IUVA News, 2004, Vol.6, No.1, P.P:20-25, International Ultraviolet Association, (IUVA), Canada
Kujundzic E., Hernandez M., Miller S. “Ultraviolet germicidal irradiation inactivation of airborne fungal spores and bacteria in upper roomair and HVAC in duct configurations”, NHR research press,2006
rate research
Read More
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 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.
Due to the high importance of designing operating rooms (especially the air conditioning parameters), many studies, researches and international codes were achieved in order to
reach the optimum parameters for this mission. Hundreds of hospitals in
Syria and all around the world are still suffering from wounds contamination during surgery.
This paper is dedicated to re document collect the latest information to help researcher and designers achieving their mission, especially those information that are not available
in one reference by itself.
The research paper discusses the optimal air conditioning requirement like, temperature, humidity, required filtration, number of air changes per hour, pressures to be maintained
and the recommended face velocity. An extended research studies focus on laminar flow system, and its advantages over the conventional ones. It mentions the sterilization supporting systems which use UVGI In-ducts and in rooms.
The paper concluded that new ideas adopting different philosophies by either supplying fresh air from lower rooms areas or laminar flow wall should be further investigated.
Young sun flower plants were exposed to ultraviolet radiation of the type UV-B (295
nm) for 3 days (2 hours per day) with or without excluding the UV-radiations using
polyethylene layers (blue and transparent) (0.5 mm thick). The amount of photosyn
thesis
pigments was measured whereby a variation in the chlorophyll contents. Chlorophyll a
(chl.a) was noticed at these rates (without covering 19.59%, transparent polyethylene
3.40%, blue polyethylene 1.66%), chlorophyll b (chl.b) at rates (7.81, 25.13, 22.79%) and
the total chlorophyll content (2.88, 21.76, 20.53%), while the amount of carotenoid
pigments has increased in the studied samples (24.45, 19.23, 17.32%). A decrease in the
rate of photosynthetic electron transport has also been noticed (88.04, 78.71, 58.81%) in
the plant samples exposed to ultraviolet radiation (on the third day) without UV excluding
and with transparent and blue polyethylene successively. All results were compared to the
sample which was not exposed to radiation.
All results indicate the negative effect of ultraviolet radiation on the chlorophyll
content and the rate of photosynthetic electron transport, therefore, on photosynthesis and
the productivity of sun flower plants. They also point out the importance of carotenoid
pigments in protecting chlorophyll pigments from the negative effects of this radiation.
Results showed the clear positive effect of polyethylene layers, specifically the blue one, in
protecting plants against this radiation.
Aim of the study: To study the effectiveness of using dental operating microscope
and ultrasonics with Hedstrom files in removing gutta-percha and sealer from root canals.
Materials and Methods: Twenty single straight rooted, extracted human mandib
ular
premolars were prepared, filled with gutta-percha and sealer (Zinc oxide with eugenol).
Specimens were then divided into two groups (N1=N2=10), and root filling material was
removed using H-files with Eucalyptol (group 1); H-files with Eucalyptol, followed by
using microscope with ultrasonic tip (group 2). After retreatment, the efficacy of each
technique was examined at 8× magnification with a stereomicroscope then the images were
analyzed using Auto-CAD 2010 according to Hulsmann and Stotz scale.
Data were statistically analyzed using Mann–Whitney U-tests.
Log in to be able to interact and post comments
comments
Fetching comments
Sign in to be able to follow your search criteria
