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Register a new userقياس الوسطاء الكهربائية لثنائيات شوتكي
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Added by
Damascus University ورقة بحثية
Publication date
2004
fields
Physics
and research's language is
العربية
Authors
خالد مصري( باحث )
Created by
Shamra Editor
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قمنا ببناء منظومات قياس المميزات الكهربائية المباشرة (V(I و السعوية (V(C لثنائيـات شـوتكي، و بوضع المنهجيات اللازمة لتحديد الوسطاء الكهربائية منها و هي تركيز الشوائب في ركيـزة الـسيليكون و تيار التسريب و ارتفاع حاجز شوتكي. من ثم، قمنا بتطبيق ذلك في دراسة ثنائي شوتكي تجاري يستخدم بوصفه كاشفاً للجسيمات ألفا، الذي يعرف بالكاشف ذي الحاجز السطحي، و كانت النتـائج التـي حـصلنا عليها متوافقة مع القيم المتوقعة.
We present a PC controlled apparatus, we have built up to measure automatically forward electrical characteristics and capacity versus voltage characteristics, of schottky diodes. Methods used to extract electrical parameters of these diodes (leakage current, Schottky barrier height and substrat doping concentration) are described. These methods were applied to a commercial Schottky diode, used as Alpha particles detector (surface barrier detector), and the obtained results were compatible with the expected ones.
References used
Okumura, T. and K. N Tu, Appl, J. “Analysis of parallel Schottky contacts by differential internal photoemission spectroscopy”, Phys. 54 (2). 1983
Schroder,D.K.1990. "Semiconductor material and device characterization"
Andre Vapaille et Rene Castagne, 1987. Dispositifs et circuits integres semiconducteurs
rate research
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In this paper, we studied the static and dynamic behavior of the
silicon carbide Schottky diodes and junction barrier Schottky diodes. The
objective of this study is to understand the performance and
characteristics of these devices in multiple working situations and in high
temperature conditions, as well as to clarify the distinction between these
two types of diodes.
Probing neural models for the ability to perform downstream tasks using their activation patterns is often used to localize what parts of the network specialize in performing what tasks. However, little work addressed potential mediating factors in s
uch comparisons. As a test-case mediating factor, we consider the prediction's context length, namely the length of the span whose processing is minimally required to perform the prediction. We show that not controlling for context length may lead to contradictory conclusions as to the localization patterns of the network, depending on the distribution of the probing dataset. Indeed, when probing BERT with seven tasks, we find that it is possible to get 196 different rankings between them when manipulating the distribution of context lengths in the probing dataset. We conclude by presenting best practices for conducting such comparisons in the future.
يقسم الكتاب إلى:
الشبكات الكهربائية الموحدة.
محطات التوليد الحرارية.
القسم الكهربائي في محطات التوليد.
محطات التوليد النووية.
محطات التوليد المائية.
محطات التوليد بالطاقة المتجددة.
أساليب نقل الطاقة الكهربائية.
الأبراج الهوائية لنقل القوى.
ع
وازل خطوط النقل.
تمثيل خطوط النقل.
مقدمة عامة عن محطات التحويل.
المعدات الرئيسية في محطات التحويل.
ترتيبات قضبان التوزيع.
تأريض محطات التحويل.
الأنظمة المساعدة في محطات التحويل.
ملامح تخطيط شبكات التوزيع.
أمثلة تطبيقية لتخطيط شبكات الجهد المتوسط.
العناصر الأساسية بشبكة التوزيع.
أنظمة التغذية في الجهد المتوسط.
شبكات الجهد المتوسط الهوائية.
دراسات هامة في شبكات التوزيع.
المواد المستخدمة في صناعة الكابلات.
تركيب الكابلات.
الخواص الكهربائية للكابلات.
اكتشاف أعطال الكابلات.
الهزات العابرة في نظم القوة الكهربائية.
استقرار منظومة القوى الكهربائية.
التوافقيات في الشبكات الكهربائية.
After that automation electrical power transfer stations towards to
use intelligent electronic devices that are performing multiple
functions : process protection, monitoring, control and use
private companies manufacturers of equipment communicat
ion
protocols, so that need to build electrical smart grid that coordinate his parameters and support his devices.
Search begins definition electrical smart grid and its importance,
and includes the benefit of this electrical smart grid, the requirements and the careers then the specifications of electrical
smart grid, at the end of the search: we compare between the
electrical power transfer stations in electrical traditional grid and
electrical smart grid.
This paper discusses improveming of the methods of computerized measurements by using some practical examples in the field of automation of flow, and pressure and level measurements and data
logging. Tnis work has been done on an experimental station, which has been developed specifically for this paipose. It is a multi purpose station for training on automation of measuring techniques in
industrial processes
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