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Register a new userLaboratory Investigation about PVC Aging used in High Voltage Cables according to IEC 587
درأسة مخبرية على البولي فينيل كلوريد PVC في ظروف التلوث وفقاً للمواصفة القياسية IEC587
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Aِl-Baath University ورقة بحثية
Publication date
2016
fields
Electrical Power Engineering
and research's language is
العربية
Created by
Shamra Editor
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تعد مشكلة التلوث من أهم المشاكل التي تواجه الشبكات الكهربائية، و خاصة في القطر العربي السوري، و ذلك بعد أن توسعت مصادر التلوث من جهة، و نظرا لأن التغذية الكهربائية قد أضحت مرتبطة بعمل كافة القطاعات الاقتصادية و اليومية، لذلك أجريت في هذه الدراسة اختبارات على مواد عازلة عند تعرضها للتلوث الصنعي.
The pollution is one of the most important problems facing the electrical networks, especially in the Syrian Arab Republic, and after that expanded of pollution sources on the one hand, and because the power supply has become related to all economic and daily life sections.
References used
M. N. Al-rayes, "Laboratory Investigation about Non-Ceramic High Voltage Insulator under Pollution Conditions
Polymer Engineering "Robats B.E NewYork, 1975
IEC 815, Selection and dimensioning of high-voltage insulators intended for use in polluted conditions
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In this study, a new poly(vinyl chloride) (PVC) membrane electrode for La3+ ion based on paraldyhed phenyl hedrazon as an electroactive material was prepared.This electrode revealed good selectivity for La3+ over a wide variety of other metal ions. E
ffects of experimental parameters such as membrane composition, nature and the amount of plasticizer, the amount of additive on the potential response of La3+ electrode were investigated. The electrode exhibited a Nernstian slope of 20.0±1.0mV per decade of La3+ over a concentration range of 1×10-7 to 1×10-1M of La3+ in the pH range 3.8–8.0. The response time was about 30 s and the detection limit was 7×10-8 M. The electrode couldbe used for at least one month without a considerable divergence in potential. The proposed electrode was used for the determination of lanthanum in a standard solations andwas successfully applied as an indicator electrode for potentiometric titration of La3+ with EDTA.
يهدف العمل إلى اعتماد طريقة اللزوجة كطريقة لدراسة امتزاج البولميرات في الحالة السائلة بنسب
معينة.
و اختير محل السيكلوهكسانون و محل ثنائي ميثيل سلفواكسيد (DMSO) كمحلين ملائمين للبولي
فينيل كلوريد (PVC) و البولي بوتاديين أكريل نتريل (ABS) قمنا بتع
يين اللزوجة النسبية، و اللزوجة .
النوعية، و اللزوجة المختزلة لعدة تراكيز.
In this paper samples of poly vinyl chloride PVC ,pure, irradiated
with Gama rays, were prepared by casting method in room
temperature and light, and under atmosphere pressure.
It was observed from this research that irradiation made real effect
on some of the studied optical properties, the irradiation increased
the transmittance while the electronic transitions kind remained
indirect before and after the irradiation.
The research aims to show the importance of the application of
International Standard ISO 17025: 2005 to adjust the general
requirements of the test laboratories efficiency. The importance of
this international standard by giving great importance
to the test
methods and calibration, which stressed the need for the
documented methods to carry out tests and analyzes and operation
of devices, and that it leads to work systematically and preserve the
expertise & documenting them and discover the analytical
problems and resolve them.
A biological study of Phytomyza orobanchia Kalt on branched broomrape
(Orobanche ramosa L.) which infest tomato crop, in the coastal region of Syria, was
conducted during 2011/2012 growing season. It included a study of some biological
parameters:
The preoviposition, oviposition, post oviposition, total number of eggs laid
per female, and total developmental period, at 25 ± 1ºc, 30 ± 1ºc and 70±5% RH. The
results showed that the fertilized females insert their eggs singly in the flowers (seed
capsules) and sometimes in the shoots of O. ramosa. The average of the total number of
eggs per female was 12.90 ± 5.41, 13.50 ± 7.53 at 25 ± 1ºc, 30 ± 1ºc, respectively,
without significant differences. The preoviposition period was 3.60 ± 0.79 day at 25 ±
1ºc, and decreased to 1.90 ± 0.32 day at 30 ± 1ºc with significant differences. The
average values of other biological parameters (oviposition, post oviposition) were higher
at 25 ± 1ºc, without significant differences. This insect has three larval instars, and the
larvae complete its development and pupate inside seed capsules. the developmental
period of pupa for female was shorter than pupa for male, and the total developmental
period of P. orobanchia occupied 18.5 ± 3.49, 17.75 ± 2.99 day for male, and 17.7 ±
2.93, 16.7± 2.6 day for female at 25 ±1ºc, 30±1ºc respectively.
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