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Register a new userNew analytical & experimental method for determination the non-paralyzable dead time of self-quenching tube Geiger-Müller (GM) counter
طريقة تحليلية و تجريبية جديدة لتعيين الزمن - الميت غير القابل - للشل لعدادات غايغر - ميلر الأنبوبية المخمدة ذاتياً بالهالوجين
1938
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Aِl-Baath University ورقة بحثية
Publication date
2017
fields
Physics
and research's language is
العربية
Authors
عبدالله رستناوي( باحث )
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Shamra Editor
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في هذا البحث، قمنا باشتقاق معادلة للزمن-الميت غير القابل-للشل تُظهر العلاقة بين الزمن-الميت و تلك العوامل. هذه المعادلة تُظهر أن الزمن-الميت تابع للجهد المطبق و الضغط و درجة حرارة و أبعاد أنبوبة العداد و نوع الغاز.
In this research, we derived a non–paralyzable dead time equation shows the relation between the dead time and those factors. This equation shows the dead time as function of the applied voltage, pressure, temperature, dimensions of counter tube and type of the gas.
References used
(G. Knoll, Radiation Detection and Measurement, John Wiley & Sons, New York.(1989
(S. H. Lee, and R. P. Gardner, A new G-M counter dead time model, Appl. Radiat. Isot., vol. 53, pp. 731-737.(2000
(W. Feller, On probability problems in the theory of counters, in R. Courant Anniversary Volume, Studies and Essays, Inter science, New York.(1948
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A simple and accurate method was developed for the analysis of
carbinoxamine maleate, dextromethorphan hydrobromide and
pseudoephedrine hydrochloride content in pure form and pharmaceutical
preparations using HPLC. Analysis was conducted on a sili
ca column (6 μm)
with mobile phase consisting of ethanol – ammonium acetate (0.05 M) in rate
[85:15] respectively, and at detection wavelength of 276 nmand flow rate 1ml/ min.
Results were linear (correlation coefficient R > 0.9996) in the range of the
studied concentrations for the active materials. The relative standard
deviations (n=6) of intra and interday assay were 0.931%, 1.527% for
carbinoxamine maleate and 0.717%, 1.058 % for dextromethorphan
hydrobromide and 0.309%, 0.891% for pseudoephedrine hydrochloride,
respectively. This method, proved to be easy, precise and economical, is useful
for quality control of pharmaceutical drugs industrial samples.
In this research, we have derived an analytical equation gives
dependency of the total gas pressure to operation time for halogen
self-quenched GM counter tubes and organic vapor or gas selfquenched
GM counter tubes. This equation indicates that t
he gas
pressure exponentially decreases as the operation time increases, at
constant temperature of tube and constant activity that this tube
exposed to.
This paper outline a new, simple, selective and sensitive spectrophotometric
procedure for the quantitative determination of iron. The bidentate ligand of 2-
(1-Acetyl-2-oxopropyl)acrylonitrile has been synthesized ,and determined by
elemental ana
lysis and infrared spectroscopy. The compound reacts with
Fe(III) to form a colored complex with an absorption maxima at 400nm and
490nm. The effect of pH, amount of reagent, time, temperature and the
interference of many ions on the Fe (III) determination was also estimated.
Beer's law is obeyed for iron concentration in the range (0.23- 4.48μg/ ml) for
spectrophotometric method and (0.56-8.4) for extraction spectrophotometric
method. The molar absorptivity was in the rang 2.70x104-3.46 x 104 L.mol-1cm-1.
Sandall's sensitivity was found to be 1.61 x 10 -3 – 2.07 x 10-3 μg . cm-2.
The RSDs for both spectrophotometric and extraction spectrophotometric
methods were below 3%. The analytical error SD/√n was within 0.021. The
technique has been applied to the determination of iron in alloys and in
pharmaceutical preparations.
New, accurate, sensitive and reliable kinetic spectrophotometric
method for the assay of fluvastatin sodium (FVS) in pure form and
capsules has been developed. The method involves the oxidative
coupling reaction of FVS with 3-methyl-2-benzothiazolinone hydrazone
hydrochloride monohydrate (MBTH) in the presence of Ce(IV) in an
acidic medium to form colored product with lambdamax at 615 nm.
Services that demanded by users via internet network are classified in two main
kinds, Services work in real time such as video and voice in real time and use UDP
protocol, and other services that work in non-real time such as web browsing (HTTP) a
nd
file transfer (FTP) which use TCP Protocol.
In this research, we study and analyze algorithms that enhance the quality of service
for various applications. For real time application, we use queues disciplines, which gives
high priority for these services and achieves minimum delay. For non-real time application,
we study congestion control algorithms, which achieve best performance for reliable
transfer process with existing the congestion in the network. We used OPNET 14.5
program for simulating various services via internet network. Simulation results show
achieving minimum delay for voice service, and achieving high transmission rate for FTP
application with existing of packets loss in the network.
تطبيقات الزمن الحقيقي
التحكم بالازدحام
Congestion Control
تطبيقات الزمن غير الحقيقي
قواعد الرتل
خوارزمية البداية البطيئة
تجنب الازدحام
خوارزمية إعادة الإرسال السريع و الاستعادة السريعة
Real Time application
non-real time application
Queue disciplines
Slow start algorithms
Congestion avoidance algorithms
Fast retransmit and Fast recovery
المزيد..
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