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Y2O3:Eu is a promising red-emitting phosphor owing to its high luminance efficiency, chemical stability, and non-toxicity. Although Y2O3:Eu thin films can be prepared by various deposition methods, most of them require high processing temperatures in order to obtain a crystalline structure. In this work, we report on the fabrication of red Y2O3:Eu thin film phosphors and multilayer structure Y2O3:Eu-based electroluminescent devices by atomic layer deposition at 300 °C. The structural and optical properties of the phosphor films were investigated using X-ray diffraction and photoluminescence measurements, respectively, whereas the performance of the fabricated device was evaluated using electroluminescence measurements. X-ray diffraction measurements show a polycrystalline structure of the films whereas photoluminescence shows emission above 570 nm. Red electroluminescent devices with a luminance up to 40 cd/m2 at a driving frequency of 1 kHz and an efficiency of 0.28 Lm/W were achieved. 相似文献
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Sarra Boudriga Saoussen Haddad Moheddine Askri Armand Soldera Michael Knorr Carsten Strohmann Christopher Golz 《RSC advances》2019,9(20):11082
In the quest for new heterocyclic scaffolds exhibiting potentially biological activities for medicinal chemistry, a multicomponent 1,3-dipolar cycloaddition reaction of tetrahydroisoquinolinium N-ylides, generated in situ from cyclic diketones and isoquinoline, and (E)-3-arylidene-1-phenyl-pyrrolidine-2,5-diones has been developed. This route provides workable access to dispiropyrrolo[2,1-a]isoquinoline-fused pyrrolidine-2,5-diones bearing two adjacent spiro-carbons. An unprecedented regioselectivity was observed in this 1,3-dipolar cycloaddition, leading to the construction of a novel dispirooxindole skeleton. The structure and relative stereochemistry of the spiranic adducts have been confirmed by three X-ray diffraction studies. To reinforce the observed regio- and stereoselectivity of the [3+2] cycloaddition, calculations using the DFT approach at the B3LYP/6-31G(d,p) level were carried out. It was found that this reaction affords the kinetic products.A new series of dispiropyrrolo[2,1-a]isoquinoline derivatives was synthesized by multicomponent 1,3-dipolar cycloaddition reaction of tetrahydroisoquinolinium N-ylides and (E)-3-arylidene-1-phenyl-pyrrolidine-2,5-diones. 相似文献
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Radiologically guided lumbar injections 总被引:1,自引:0,他引:1
Lumbar injections of corticosteroids are an established part of sciatica nonsurgical treatment; that's to their anti-inflammatory properties. Fluoroscopically monitored injections are more likely to place medication at the exact target site and with higher concentration; then they maximize therapeutic results. Lumbar steroid injections are efficient at short and middle term, and they precipitate relief. 相似文献
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Faouzi Addad Tahar Chakroun Ismail Elalamy Fatma Abderazek Saoussen Chouchene Zohra Dridi Gregoris T. Gerotziafas Mohamed Hatmi Mohsen Hassine Habib Gamra 《International journal of hematology》2010,92(2):296-301
The aim of this pilot study was to compare the effect of two different regimens of aspirin dosage on platelet of coronary
artery disease (CAD) diabetic patients. Twenty-five CAD diabetic patients were included. Initially, all patients received
aspirin 100 mg/day for 10 days. At day 10, aspirin antiplatelet effect was determined by measuring the collagen/epinephrine
closure time (CT) 2 h after the last aspirin dosage and the next morning at 8 a.m.. The aspirin regimen was modified to 100 mg
twice daily for patients showing a non-optimal platelet-inhibitory effect (CT < 298 s at 8 a.m.). Persistent high platelet
reactivity (HPR) was defined by a CT < 160 s. During the 100 mg/day aspirin regimen, the prevalence of HPR at 8 a.m. was 48%,
and only 7 patients (28%) had showed an optimal platelet-inhibitory effect. Bridging to the twice-daily regimen, the HPR was
significantly reduced (p = 0.025), and the optimal platelet-inhibitory effect was reached for 3 other patients. Our results showed that 100 mg aspirin
twice-daily dosing rather than a once-daily dose significantly improves the aspirin effect on platelet of CAD diabetic patients.
However, large prospective studies were needed to confirm whether this strategy will be clinically relevant and safe. 相似文献
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Soraya Fenniche Sonia Maalej Hela Hassene Saoussen Hantous Dalenda Belhabib Sonia Bakkari Faouzi el Mezni Habiba Horchani Lamine Megdiche Mohamed 《La Tunisie médicale》2003,81(1):59-62
Thymolipoma is a rare thymic tumor; His frequency is estimated at 2 at 9% of all thymic tumors. His diagnosis usually easy, can be difficult with an unusual radio clinic pattern, but actually get benefice from progress in radiologic investigations especially MRI. We reported a case of a 36-year old woman, admitted for a left pleuro-pneumopathy investigation. Evolution, after antibiotic treatment and pleural effusion draining, was well. However, patient developed systolic aortic murmur and a chest-X-ray cardiomegaly supposing cardiologic dysfunction. But the normality of cardiac sonography, the ascension of diaphragma and non-specific thoracic sonographic pattern, guided to thoracic MRI. This exploration demonstrated a giant thymolipoma, which was confirmed by the histologic examination of a resected mass. 相似文献
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Oculomotor muscles involvement revealing dermatomyositis in a patient with rheumatoid arthritis 总被引:2,自引:0,他引:2
Younes M Béjia I Moussa A Touzi M Zrour S Haddada F Zakhama A Bergaoui N 《La Revue de médecine interne / fondée ... par la Société nationale francaise de médecine interne》2004,25(11):829-832
INTRODUCTION: Oculomotor muscles (OMM) involvement in dermatomyositis (DM) and in rheumatoid arthritis (RA) is unusual. The DM always leads to OMM inflammation, whereas the RA particularly leads to tenosynovitis of the superior oblique muscle referred to as the Brown syndrome. OBSERVATION: The patient is a 43-year-old woman who gives a 17-year-history of severe seropositive RA with bilateral coxite. She was hospitalized for acute painful proptosis. The clinical examination revealed an orbital erythema and a muscular rhizomelic weakness. The muscular enzymes were increased. The orbital CT revealed in the right side, an enlargement of the superior rectus muscle that was enhanced after intravenous injection, which is compatible with myositis involvement. The muscular biopsy practiced at the level of the calf showed the specific histological signs of the DM. This orbital involvement was resolved with a high dose of corticosteroids. CONCLUSION: Our observation has the specificity of associating RA with DM with an involvement of the superior rectus muscle, which is due to the DM rather than the RA. 相似文献