Do you want to publish a course? Click here

Studying the luminescence of Praseodymium doped in Crystals Li2YB5O10, LaF3 under X-ray Excitation

دراسة تألق البراسيوديميوم Pr في البلورات Li2YB5O10, LaF3 بتهييجها بالأشعة السينية X-ray

757   1   6   0 ( 0 )
 Publication date 2014
  fields Physics
and research's language is العربية
 Created by Shamra Editor




Ask ChatGPT about the research

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.


Artificial intelligence review:
Research summary
تتناول هذه الدراسة الطيف التألقي للإصدار الفوتوني التدفيقي لإيون البراسيوديميوم (Pr3+) بنسبة 1% في بلورات Li2Yb5O10 وLaF3 عند تهييجها بالأشعة السينية. أظهرت بلورة Li2Yb5O10 قمم طيفية رئيسية عند الأطوال الموجية 272nm و300nm بزمن تألق 10.6ns، بينما أظهرت بلورة LaF3 خطين طيفيين حادين عند الأطوال الموجية 478.6nm و485.5nm بزمن تألق 1.8ns. تشير النتائج إلى أن هذه البلورات تتمتع بخصائص تألقية جيدة، مما يجعلها واعدة لتطوير أجهزة الليزر والمعدات الطبية وكواشف الإشعاع. أجريت القياسات في جامعة بطرس بورغ التكنولوجية الحكومية في روسيا عام 2008.
Critical review
دراسة نقدية: تعتبر هذه الدراسة مهمة في مجال تحسين خصائص التألق للمواد المستخدمة في التطبيقات الطبية والعلمية. ومع ذلك، كان من الأفضل تضمين مزيد من التفاصيل حول تأثيرات التراكيز المختلفة لإيون البراسيوديميوم على الخصائص التألقية للبلورات. كما أن الدراسة كانت تعتمد بشكل كبير على القياسات التجريبية دون تقديم تفسير نظري كافٍ للنتائج. بالإضافة إلى ذلك، كان من الممكن توسيع نطاق البحث ليشمل مواد أخرى لتحسين الفهم الشامل للظاهرة المدروسة.
Questions related to the research
  1. ما هي الأطوال الموجية الرئيسية التي أظهرتها بلورة Li2Yb5O10 عند تهييجها بالأشعة السينية؟

    أظهرت بلورة Li2Yb5O10 قمم طيفية رئيسية عند الأطوال الموجية 272nm و300nm.

  2. ما هو زمن التألق للبلورة LaF3 عند الطول الموجي 485.5nm؟

    زمن التألق للبلورة LaF3 عند الطول الموجي 485.5nm هو 1.8ns.

  3. ما هي التطبيقات المحتملة للبلورات المدروسة في هذا البحث؟

    التطبيقات المحتملة تشمل تطوير أجهزة الليزر، المعدات الطبية، وكواشف الإشعاع.

  4. أين أجريت القياسات التجريبية لهذه الدراسة؟

    أجريت القياسات في جامعة بطرس بورغ التكنولوجية الحكومية في روسيا عام 2008.


References used
YAMADA ET AL. A scintillator Gd2O2S:Pr for X-ray computed tomography, Jour. Electrochem. Soc, Russian, vol. 136, N. 9,1989, p.p. 2713-2731
KHADRO A., The wave length and spectral time measurement of the high yield phospharite compounds, Tishreen Univ. Journal, Syria, Lattakia, vol. 25, 2003, p.p. 230-237
KYOO SHIM., HYUN YANG, YE JEONG , Enhanced luminescent characteristics of laser-ablated GdVO4: Eu3+ thin films by Li doping, Applied Surface Science, V. 235, 2007, p.p. 8146-8150
rate research

Read More

Our paper aims to automate the generation of medical reports from chest X-ray image inputs, a critical yet time-consuming task for radiologists. Existing medical report generation efforts emphasize producing human-readable reports, yet the generated text may not be well aligned to the clinical facts. Our generated medical reports, on the other hand, are fluent and, more importantly, clinically accurate. This is achieved by our fully differentiable and end-to-end paradigm that contains three complementary modules: taking the chest X-ray images and clinical history document of patients as inputs, our classification module produces an internal checklist of disease-related topics, referred to as enriched disease embedding; the embedding representation is then passed to our transformer-based generator, to produce the medical report; meanwhile, our generator also creates a weighted embedding representation, which is fed to our interpreter to ensure consistency with respect to disease-related topics. Empirical evaluations demonstrate very promising results achieved by our approach on commonly-used metrics concerning language fluency and clinical accuracy. Moreover, noticeable performance gains are consistently observed when additional input information is available, such as the clinical document and extra scans from different views.
Radiology report generation aims at generating descriptive text from radiology images automatically, which may present an opportunity to improve radiology reporting and interpretation. A typical setting consists of training encoder-decoder models on image-report pairs with a cross entropy loss, which struggles to generate informative sentences for clinical diagnoses since normal findings dominate the datasets. To tackle this challenge and encourage more clinically-accurate text outputs, we propose a novel weakly supervised contrastive loss for medical report generation. Experimental results demonstrate that our method benefits from contrasting target reports with incorrect but semantically-close ones. It outperforms previous work on both clinical correctness and text generation metrics for two public benchmarks.
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.
The Lee code is applied to characterize the plasma focus in two plasma focus devices UNU/ICTP PFF and Amirkabir plasma focus device (APF), and for optimizing the nitrogen soft x-ray yields based on bank, tubes and operating parameters. It is foun d that the soft x-ray yield increases with changing pressure until it reaches the maximum value for each plasma focus device, with keeping the bank parameters, operational voltage unchanged but systematically changing other parameters.
The work could be considered as a continuous study of (XRL) X – ray luminescence - spectra of pure, and mixed Zno different AL ions, In these films and other crystals powders prepared by new developed te chnology. We studied the pure and ZnO thin films. mixed with an AL - ions in the fielol (200-700)nm ,at different weig hrs (5,10,15,20)wt% prepared by thermal evaporation. This way is cheep and a simple technology. Our study showed different spectra peaks at the wavelengths(335,410,521)nm anol (t=20ns)produced, at different peaks intensities of the prepared thin films, compared with those jure and mixeol ZnO ones, spray pyrolysis. Thin films technology, have many wide scientific application, in the medical field, Lazer technology, Luminscence counters, and at the solar cells fields

suggested questions

comments
Fetching comments Fetching comments
mircosoft-partner

هل ترغب بارسال اشعارات عن اخر التحديثات في شمرا-اكاديميا