The of this study was to evaluate the bonding strength of a
posterior composite restorations when two different types of
equipment methods were used for preparation of dentin (Erbium-doped
yttrium aluminum garnet laser (Er:YAG ) and diamond burs).
This study specimen consisted of Eighty molars, was divided
randomly into two main groups (40 molars were prepared with
diamond burs, and 40 molars were prepared with laser Er: YAG).
In this study, we have designed and manufactured a simple and relatively
inexpensive solar cell, from the available materials in the local markets, where the cell is
contained of the outer body (Case), which is a plastic box on a parallel form of r
ectangles
of acrylic transparent allows the passage of light. It has resilient and high durability, and
two poles of red copper higher purity, one of them has been thermally treatment to
different temperatures (200, 300, 400°C), which turns the copper pole from carrier to semiconductor
(cuprous oxide, Cu2O), using heating device (Hot plate).
The other pole left without treatment and the electrolyte solution (Gel) has been
developed on the (Hydrogel), thus freeing electrons from the treatment plate to the
Hydrogel layer then to the clean plate (non-treatment), during shining light.
The results showed that the cell voltage proportional to the polyelectrolyte
concentration and the area of copper pole (cuprous oxide). As the experiments showed that
the temperature has an important role in transforming the metal carrier to the semiconductor,
and whenever this conversion possible whenever the pole of the light
sensitively more effective and efficient.
Orange fruits are characterized at harvesting with physical and sensory
properties determine consumer acceptance and in order to identify these
characteristics and vulnerability storage and irradiation conditions, Valancia
orange fruits were subje
cted to gamma irradiation at doses of 0.0, 0.5, 1.0, and
1.5 kGy using gamma 60Co irradiator facility. Fruits were kept in a refrigerator
for 18 weeks. Results indicated that physical and sensory properties of Valencia
orange fruits were affected by storage time and irradiation. The overall color
differences were increased and the firmness of fruits and skin were decreased.
The used doses of gamma irradiation increased the overall color differences of
fruit skin. Whereas the fruit firmness, and the sensory properties (aroma,
color, test and firmness) of irradiated Valencia orange fruits were decreased.
Recently laser applications have been expanding to include many fields.
Among these, are medical laser surgery and biological applications. It is
important to understand the interaction mechanisms that may occur when
applying laser light to biolog
ical tissues in order to minimize damage to the
tissues resulting from extra heat applied. The aim of this study is to study the
temperature distribution in living biological tissues when laser irradiation is
used in a treatment by solving bio-heat equation.
The aim of this research was to assess the physical, chemical،
microbiological and sensory characteristics of new made Qamar Al– stored for
six months and determine the effect of gamma rays on those characteristics.
Samples of Qamar Al–Din were su
bjected to sulfur fumigation and other
samples were left without sulfur fumigation and all samples were exposed to
four radiation doses (0, 1, 2 and 3 kilo Gray) and stored for 6 months at room
temperature (20° C). Results showed significant differences between sulfated
and non-sulfated samples in terms of pH, relative humidity, ash, total sugar،
viscosity, potassium, sodium, sulfur vitamin C and it was observed lower
microbial load. Results also showed that amount of vitamin C and viscosity was
significantly the highest in sulfated samples irradiated with 2 and 3 kilo Gray
and irradiation with a dose of 2 kilo Gray eliminated sufficiently the microbial
load. It was concluded that running this study is helpful to shed the light on the
importance of such these treatments especially that this traditional product
concerns large number of consumers and is exported to different countries in
the world.
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.
This study involved the irradiation of mouse embryos at different stages of
pregnancy, using dose of ٤ Gy γ-radiation, at ١٠, ١٢, ١٤ and ١٦ days of
pregnancy. Pregnant mice were killed after ٢, ٤ and ٦ days post irradiation.
Embryo’s heads were is
olated and serial cross sections were made to
investigate the effect of irradiation on the different components of the eye at
different periods of eye organogenesis.
It was proved from this study that irradiation causes microphtalmia and
decrease in the growth of lens, retina and corneal stroma, as well severe
disruption in its development and disfigurement in its hitogenesis. These
defects have shown great differences in their severity according to the age of
embryos at exposure and the number of days post irradiation.
