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Register a new userStudy Of The Effect Of The Usage Time On The NaI(Tl) Scintillation Detector Supply Linearity
دراسة تأثير زمن الاستخدام على خطية تغذية الكاشف الوميضي (NaI(Tl
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Aِl-Baath University ورقة بحثية
Publication date
2017
fields
Physics
and research's language is
العربية
Created by
Shamra Editor
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في هذا البحث، قمنا بدراسة خطية التغذية بدلالة زمن الاستخدام للكاشف الوميضي (NaI(Tl من خلال التعيين التجريبي لخطية التغذية لكاشفين وميضيين (NaI(Tl متماثلين من نفس الشركة المصنعة أحدهما مستخدم أكثر بكثير من الآخر.
In this research, we studied the supply linearity as function the usage time of NaI(Tl) scintillation detector through the experimental determination of the supply linearity of two identical NaI(Tl) detectors from the same manufacturer, one of which is much more used than the other
References used
Photomultiplier Tubes: Basics and Applications, Hamamatsu Photonics K.K., 2007
H. K. Lv, X.D. Sheng, J. Liu, for the lhaaso collaboration international, cosmic ray conference, RIO DE JANEIRO 2013
Photomultiplier Tubes: Construction and Operating Characteristics, Hamamatsu Photonics K.K., 2010
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In this research, we assume that during the detector work,
some changes occur in the detector structure that cause shift of the
statistical fluctuation range of the count rates and change the time
constant of the pulse formation circuit.
The aim of this research is to speed up the offensive tactic by improving reaction
time when performing the forehand strike .
For this reason, this research adopted the( 24) participants from the first-class table
tennis clubs players in Latakia (
junior category ). They were divided into two equal groups
(experimental and control group ) .
The two samples underwent a pre test to measure reaction time , and they performed
the ball driven from the machine test.
Then, the experimental group underwent training program designed for four weeks :
each week is composed of three training session and each session includes four or five
exercises to develop the reaction time in table tennis .
The control group underwent their traditional program as usual.
Then the two samples underwent a post test , and they also performed the ball driven
from the machine test.
The searcher used experimental method for two groups (experimental and control)
by using the pre and post test to the both groups.
Then the results of the two samples were compared between pre and post tests .
The researcher concluded that the applied training program affected positively on
improving reaction time when performing the forehand strike .
Aim: to compare the effect of multiple usage and surface coarseness of diamond
burs on marginal microleakage of cervical resin composite restorations.
Materials and methods: sixty extracted premolars without caries were chosen. The
sample was rand
omly divided into three groups: n1=n2=n3=20. Group(1): class v cavities
were prepared using super coarse diamond burs, group(2): prepared by coarse diamond
burs, whereas group)3(: prepared by medium coarse diamond burs. All cavities were
restored by resin composite, then The teeth were thermocycled and immersedIn5%solution
of methylene blue dye for 12hours.Then the teeth were sectioned vertically, Dye
penetration was evaluated using a 10X stereomicroscope at the occlusal and gingival
margins. Data were collected and statistical analysis was conducted.
Results: The results showed that the multiple use of super coarse diamond burs
caused no significantly statistically affect on occlusal and gingival microleakage (P>0.05).
However, the multiple use of coarse and medium diamond burs caused significantly
statistically affect on gingival marginal microleakage (P<0.05).
The substance, Na٢-EDTA, disodium salt of Ethylene Diamine Tetra Acetic
acid, has big influence on the setting time of both Portland cement, and clinker.
The time of initial, and final setting is remarkably changed in the presence of a
small perce
ntage of Na٢-EDTA (less than ١٪ of the cement weight).
The chemical analysis indicates that the total concentration of calcium in the
aqueous phase of cement increases in the presence of Na٢-EDTA. While, the
concentration of free calcium ions in the aqueous phase decreases as the
percentage of Na٢-EDTA increases. Na٢-EDTA forms chelating complexes with
calcium, and some other metals such as iron and magnesium at high PH values,
as in the case of a mixture of cement and water.
In this search, has been studied set of practical experiences for compacting several
metal powders composed a metallic alloy based iron from powders with a proposed
geometric shapes (cylindrical). Several tests were done in order to reach the relat
ionship
between the final apparent density for the compact with a sintering time, and study
changing the geometric dimensions of the final compact after the completion of sintering
process during different time periods.
The tests and Measurement results had been demonstrated that sintering time affect
positively on the apparent density of the final compact which Manufactured by technique
metal powders, and thus will increase its strength, where proportionality is directly
proportional access even to a certain extent. And also its effect was an obvious shrinking
diameters samples used in the tests. And changing (increase or decrease) in height samples.
Search has shown the great importance of the follow-up studying and analyzing the
relationships which associate that variables of metal powders technique each other, and
their different effect on the final compact.
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