161 research outputs found
A simple transformation for converting CW-OSL curves to LM-OSL curves
No full textA simple mathematical transformation is introduced to convert from OSL decay curves obtained in the conventional way to those obtained using a linear modulation technique based on a linear increase of the stimulation light intensity during OSL measurement. The validity of the transformation was tested by the IR-stimulated luminescence curves from feldspars, recorded using both the conventional and the linear modulation techniques. The transformation was further applied to green-light-stimulated OSL from K and Na feldspars. (C) 2000 Elsevier Science Ltd. All rights reserved
Photo-Transferred Thermoluminescence of Shallow Traps in Β-Irradiated Beo Ceramics
No full textGasanly, Nizami/0000-0002-3199-6686; Gasanly, Nizami/0000-0002-3199-6686; Bulur, Enver/0000-0002-4000-7966Photo-transferred thermoluminescence signals from beryllium oxide (BeO) ceramics were measured in the low temperature range of 10-300 K. Samples irradiated at room temperature using a Sr-90/Y-19 beta source were cooled down to 10 K and trapped charges were photo-transferred at this low temperature using the light from a high power blue LED emitting at similar to 470 nm (2.6 eV). Thermoluminescence glow curve recorded at 0.2 K/s heating rate exhibited three peaks around 90, 160 and 185 K. The analyses of the TL peaks of the glow curve were accomplished using curve fitting, differential and peak shape methods. Results obtained from these techniques are in good agreement about the presence of three trapping centers in BeO ceramics with activation energies of 0.24, 0.48 and 0.56 eV. Moreover, the analyses indicated that first-order kinetics (slow retrapping) is the dominant mechanism in the luminescence process. Heating rate dependence of the glow curves was also investigated between 0.2 and 0.8 K/s rates. (C) 2017 Elsevier B.V. All rights reserved
TL and TSC studies on TlGaSe<sub>2</sub> layered single crystals
No full textGasanly, Nizami/0000-0002-3199-6686; Gasanly, Nizami/0000-0002-3199-6686; Bulur, Enver/0000-0002-4000-7966Defects in - as grown - TlGaSe2 layered single crystals were investigated using Thermoluminescence (TL) and Thermally Stimulated Currents (TSC) techniques in the temperature range 10-300 K. TL and TSC curves of samples illuminated using a light with energy greater than the band gap of the material, i.e. blue light (similar to 470 nm) at 10 K, exhibited peaks around 27 and 28 K, respectively, when measured by heating up the samples at a rate of 1 K/s. TL and TSC curves were analyzed to characterize the defects responsible for the peaks. Both TL and TSC peaks were observed to be obeying first order kinetics. Thermal activation energies of the peaks were determined using various methods: curve fitting, initial rise, peak shape and different heating rates. For both TL and TSC peaks, thermal activation energy was determined as around 8 meV, implying that they may originate from similar kinds of trapping centers. A distribution of traps (in terms of energy) was experimentally verified by illuminating the sample at different temperatures and measuring the TL curves. As a result of this, the apparent thermal energies were observed to be shifted from similar to 8 to similar to 17 meV by increasing the illumination temperature from 10 to 16 K. (C) 2013 Elsevier B.V. All rights reserved
Phototransferred thermoluminescence from alpha-Al2O3:C using blue light emitting diodes.
No full textPhototransferred thermoluminescence (PTTL) from alpha-Al2O3:C single crystals was studied using a blue light emitting diode (LED) for phototransfer of charges from deep traps to the main dosimetry trap. The dose response was found to be linear in the region from similar to 5 mGy to similar to 5 Gy. It was observed that the corresponding deep traps were located near 500 degrees C and heating to temperatures > 600 degrees C removes the PTTL effect induced by the light from the blue LED. The thermal activation energy of the source traps involved in the PTTL production was calculated as 3.23 eV
Low-Temperature Thermoluminescence in Layered Structured Ga<sub>0.75</Sub>in<sub>0.25< Single Crystals
No full textGasanly, Nizami/0000-0002-3199-6686; Gasanly, Nizami/0000-0002-3199-6686; Bulur, Enver/0000-0002-4000-7966Defect centers in Ga0.75In0.25Se single crystals have been studied performing the thermoluminescence measurements in the temperature range of 10-300 K. The observed glow curves were analyzed using curve fitting, initial rise, and different heating rate methods to determine the activation energies of the defect centers. Thermal cleaning process has been applied to decompose the overlapped curves. Four defect centers with activation energies of 9, 45,54 and 60 meV have been found as a result of the analysis. The capture cross sections and attempt-to-escape frequencies of the defect centers were also found using the curve fitting method under the light of theoretical predictions. The first order kinetics for the observed glow curve was revealed from the consistency between the theoretical predictions for slow retrapping and experimental results. Another indication of negligible retrapping was the independency of peak position from concentration of carriers trapped in defect levels. (C) 2012 Elsevier B.V. All rights reserved
Risāletü’l-Hākimiyye fi’l-İrādeti’l-Cüz'iyye; رسالة الحاكميه فى الارادة الجزئيه; Zeyl-i Risāletü’l-Hākimiyye fi’l-İrādeti’l-Cüz'iyye; ذيل رسالة الحاكميه فى الارادة الجزئيه; Sübülü’l-Hüdā; سبل الهدى; Es'ile-i Zarife ve Ecvibe-i Latife; اسئلۀ ظريفه و اجوبۀ لطيفه
No full text1. eser : İçindekiler : Eser 24b’de son bulur. 24b-25b: Hızır ve Musa hk. 2. eser : İçindekiler : 30a: bazı hadisler, 30b-31b: Yazar eseri nasıl yazmaya karar verdiğini ayrıntılı şekilde anlatır. Kaza, kader ve irade konusunda mevcut kaynakları tarayarak eserini yazdığını söyler. Sayfa kenarlarında kısa notlar vardır. 3. eser : İçindekiler : Müellif, kendi eserine zeyl olarak yazdığı bu risalede kaza ve kader hakkında Eşariyye ve Maturidiyye’nin görüşlerini ayrıntılı bir şekilde ele almıştır. 4. eser : İçindekiler : 98a’da fihrist vardır. Eser “Marifet ve İman” kitabıyla başlayıp “Savm” kitabıyla son bulur (139b). 5. eser : İçindekiler : Risale, soru cevap şeklinde verilen fetvalardan ibarettir.Original scanned with Zeutschel OS 12000C A2 scanner and saved as 300 ppi uncompressed tiffs. Display images generated in CONTENTdm as JP20005 vol. in 1; 20x14 c
OSL from beo ceramics: new observations from an old material.
No full textIn BeO ceramics, exposed to ionizing radiation, an intense OSL signal was observed. The properties of the signal and its behavior under various experimental conditions were investigated. It was found that the OSL signal is a composite signal and exhibits strong thermal quenching. The quenching energy was estimated as similar to 0.5 eV. The excitation spectrum of the OSL signal was obtained as a broad peak in the region 420-550 nm with maximum around 435 nm. The possible correlation between the OSL signal and the peaks in the TL glow curve was also examined. It was interesting to observe that the highly light sensitive TL peak near 220 degrees C does not contribute to the OSL signal. The OSL signal was found to originate from a trap near 340 degrees C. To check the possibility of using the material for radiation dosimetry the dose response and thermal stability of the OSL signal were also investigated. The dose response was found to be guile linear up to similar to 10 Gy. The thermal activation energy of the OSL trap was determined as similar to 1.7 eV using isothermal annealing and heating rate methods thus proving the suitability for dosimetry
Kitāb-ı Güzide; كتاب كزيده
No full text2. eser : İçindekiler : 7b-8a’da fihrist vardır. Eser, İslam ahlakı hakkında açıklama ve öğütlerden oluşan 46 bab’a ayrılmıştır. Bu nüsha “Müminler nişanı”nı bildiren 42. bab’da son bulur. Bazı sayfa kenarlarında farklı bir yazıyla açıklamalar vardır (ör. 30a, 38a, 58b, 61a vs.). 2. eser : Ek bilgiler : Eser Ebû Nasr b. Tâhir b. Muhammed es-Serahsî’den tercümedir. Özellikle Eski Anadolu Türkçesi çalışmaları açısından önemli bir eserdir.Original scanned with Zeutschel OS 12000C A2 scanner and saved as 300 ppi uncompressed tiffs. Display images generated in CONTENTdm as JP20002 vol. in 1 (15 lines); 23,5x15,5 c
Mad-honey intoxication confirmed by pollen analysis
No full textContext. Despite numerous publications showing rhythm disturbance and hypotension caused by mad-honey intoxication, none of the findings are associated with ischemic heart disease. Case details. A 48-year-old patient was admitted to emergency service with acute anterior wall myocardial infarction after ingestion of mad-honey. Stent was implanted to the 99% stenosis lesion in the mid-portion of left anterior descending coronary artery. In this case, pollen analysis showed the suspected honey heavily contaminated with Rhododendron species pollen. Discussion. Mad-honey intoxication cases often apply to emergency service with similar signs and symptoms of acute coronary syndrometherefore it may cause acute coronary syndrome to be bypassed. This also shows that in the cases of mad-honey intoxication, suspected honey pollen and/or toxin analysis should be done to confirm the diagnosis of mad-honey intoxication
Infrared (IR) stimulated luminescence from feldspars with linearly increasing excitation light intensity.
No full textIR stimulated luminescence signal from potassium and sodium feldspars were studied by linearly increasing the excitation power from zero to a maximum value during the readout. The peak shaped signals observed in both feldspars could be approximated using a linear combination of three first-order components as deduced by curve fitting. The thermal and radiation dose dependent behavior of the IR-stimulated OSL curves were also studied. (C) 1999 Elsevier Science Ltd. All rights reserved
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