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Aِl-Baath University رسالة ماجستير
Publication date
2014
fields
Chemistry
and research's language is
العربية
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دراسة المحاليل الصلبة المتشكلة في الجملة [Zn_(2-x) (Ti_a Sn_b ) 〖_(1-x)〗Fe_2x O_4] يهدف هذا البحث لتحضير مركبات عدة للأكسيد المشترك
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References used
Kim H T KIM SH NAHMS BYUN J D , J Am Cer , Soc 82 (1999)
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يتضمن هذا البحث تحضير مُركب الانضغاط المغناطيسي عند النسب x= (0.0, 1.0) بالطريقة السيراميكية عند درجة حرارة تلبيد 1200 . دُرست بعض خصائصه البنيوية بتقنية انعراج الأشعة السينية XRD، والميكانيكية بتقنية تحويل فُورييه للأشعة تحت الحمراء FT-IR. وذلك بهد
ف تحديد سرعة وتردد الأمواج التي يمكن توليدها باستخدام المُركب المُحضر. تُظهر النتائج تَشكُل بنية السبينيل المكعب المميز للفرايت، وأن متوسط أبعاد الحبيبة من مرتبة الـ nm. كما لاحظنا عند النسبة x=1.0 زيادة في قيم كل من متوسط أبعاد الحبيبة وثابت الشبكة البلورية، وبالمقابل نقصان قيم كل من الكثافة، ومعامل يونغ للمُركب. تُبين النتائج أيضاً أن تردد الأمواج فوق الصوتية التي يمكن توليدها يقع ضمن المجالين kHz والـ MHz، أما الأمواج فوق الصوتية المتولدة من فرايت النيكل لها سرعة وتردد أعلى مقارنة مع الأمواج فوق الصوتية المتولدة من فرايت الكوبالت .
In this paper, we explore text classification with extremely weak supervision, i.e., only relying on the surface text of class names. This is a more challenging setting than the seed-driven weak supervision, which allows a few seed words per class. W
e opt to attack this problem from a representation learning perspective---ideal document representations should lead to nearly the same results between clustering and the desired classification. In particular, one can classify the same corpus differently (e.g., based on topics and locations), so document representations should be adaptive to the given class names. We propose a novel framework X-Class to realize the adaptive representations. Specifically, we first estimate class representations by incrementally adding the most similar word to each class until inconsistency arises. Following a tailored mixture of class attention mechanisms, we obtain the document representation via a weighted average of contextualized word representations. With the prior of each document assigned to its nearest class, we then cluster and align the documents to classes. Finally, we pick the most confident documents from each cluster to train a text classifier. Extensive experiments demonstrate that X-Class can rival and even outperform seed-driven weakly supervised methods on 7 benchmark datasets.
This work aims to find the differential scattering cross-section
for X-ray
scattered by aluminum target with angles in intervals in accordance to both
polarization cases ( completely – partly).
In addition, the relative scattered intensity and po
larization degree have been
presented as a function of scattered angles and the extreme values are found for each curve.
This research could be considered as a continuous study of luminescence spectrum of praseodymium cascade photon emission Pr3+ of 1% ions effect on Li2YB5O10 and LaF3 crystals. The Li2YB5O10 crystal shows many spectrum peaks, mainly of 272nm and 300nm
wavelengths of luminescence decay τ=10.6 ns. The other crystal LaF3 shows two sharp spectrums of 478.6nm and 485.5nm wavelengths, which are due to the energetic transitions of 3P0→3H4 of luminescence decay τ=1.8 ns. This study proves that these two crystals exhibit good luminescence properties as promising compounds for laser and medical equipments to be used in radiation detectors and other research domains.
The measurements were done in Tech-governmental University of Petersburg, Russia, 2008.
Pairs of electron-holes are produced in the space-charge region of a diode pn
heterojunction as a result of an accelerated electron beam collisions having
enough energy larger or equal (≤ ٥٠ kev). Due to the intrinsic electric field an
electric cu
rrent will flow (Electron beam induced current EBIC) in an
appropriate external electric circiut. When an external forward electric field is
applied an electric current IF will flow, helping in electron-hole which
combination produc an additional cathodo-lumines-cence. the study of cothodolumines-
cence intensity variations will give electronic properties and electric
structure of the space - charge.
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