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| 1 | Effect of alumina content and heat treatment on microstructure and upconversion emission of Er^(3+)ions in oxyfluoride glass-ceramics显示文摘The effect of alumina content and heat treatment temperature and time, on microstructure and Er3+ (0.5 mol.%) emission of oxy-fluoride glass-ceramics were investigated in this research. Two values of 1.8 (SA1.8Er0.5) and 2.18 (SA2.18Er0.5) were selected in this re-search for SiO2/Al2O3 ratio. According to DTA results, precursor glasses were heat treated at 630, 660 and 690 °C for 4 h and some glasses were also heat treated at 630 °C for 48 and 72 h. The results indicated that alumina content had significant effect on phase separation and vis-cosity of the glasses. Therefore the size, size distribution, and volume concentration of nano CaF2 crystals which precipitated during the heat treatment depended on alumina content of the glass. Due to the much smaller size of the precipitated CaF2 crystals in the glasses of low alumina content, these samples maintained excellent transparency and had narrower crystal size distribution than the high alumina glasses. The crystal size was increased markedly with the temperature increasing from 630 to 690 °C. On the other hand a slight increase was observed in the crystal size by raising the heat treatment time in both glasses. Results indicated that in low alumina content glass (SA2.18Er0.5) the size of CaF2 nanocrystals was controlled in one order of magnitude. The increase of heat treatment time and temperature led to the incorporation of Er3+ ions into CaF2 crystalline phase, increasing significantly the upconversion intensity. After heat treatment at 690 ℃ for 4 h, atomic force microscope (AFM) re-vealed the development of small crystals with an average size of 80 and 30 nm in SA1.8Er0.5 and SA2.18Er0.5 samples, respectively. | Mohammad Hasan Imanieh Bijan Eftekhari Yekta Vahak Marghussian Inocencio Rafael Martin Benenzuela Alberto Hernandez Creus Saeed Shakhesi Esmaeil Eslami | 2012 | Journal of Rare Earths2012，30，12： | 3 |
| 2 | Oral medications regarding their safety and efficacy in the management of patent ductus arteriosus显示文摘Patent ductus arteriosus(PDA) is a common clinical condition in preterm infants which is inversely related to birth weight and gestational age. Cyclooxygenase inhibitors such as indomethacin and ibuprofen which block the prostaglandin conversion from arachidonic acid are the most commonly used drugs for ductal closure. This review focuses on the safety and efficacy oral medications in the management of PDA in preterm infants. Ibuprofen seems to be the first choice due to its higher safety profile, as it is associated with fewer gastrointestinal and renal side effects when compared to indomethacin. PDA closure rates are better with oral than with intravenous ibuprofen probably due to the pharmacokinetic of the drug. However, these medications were reported to be associated with several adverse including transient renal failure, gastrointestinal bleeding and perforation, hyperbilirubinemia and platelet dysfunction. Paracetamol seems be an alternative to PDA therapy with lower adverse events and side effects. | Mehmet Yekta Oncel Omer Erdeve | 2016 | World Journal of Clinical Pediatrics2016，5，1： | 3 |
| 3 | Floor tile glass-ceramic glaze for improvement of glaze surface properties显示文摘 | Bijan Eftekhari Yekta Parvin Alizadeh Leila Rezazadeh | 2006 | Journal of the European Ceramic Society2006，，16： | 2 |
| 4 | Preparation and catalytic applications of partially fluorinated binaphthol ligand显示文摘 | Yekta S KrasnovaL B Miampillai B | 2004 | Journal of Fluorine Chemistry2004，125，4： | 1 |
| 5 | Professional competence:factors described by nurses as influencing their development显示文摘 | Khomeiran R T Yekta Z P Kiger A M | 2006 | Int Nurs Rev2006，53，1： | 1 |
| 6 | Vertebrate microRNA genes显示文摘 | Lim LP Glasner ME Yekta S | 2003 | Science2003，299，5612： | 1 |
| 7 | The effect of B203 , PbO and P2O5 on the sintering and machinability of fluormica glass-ceramics 显示文摘 | Eftekhari Yekta B Hashemi Nia S Alizadeh P | 2005 | J European Ceram Soc2005，25，： | 1 |
| 8 | MicroRNA directed cleavage of HOXB8Mrna显示文摘 | Yekta S Shih I H Bartel D P | 2004 | Science2004，304，5670： | 1 |
| 9 | Synthesis of Y(AI,Cr)O3 Red Pigments by Co-precipitation显示文摘 | Ahmadi S Aghaei A Eftekhari Yekta B | 2009 | Ceramics International2009，35，8： | 1 |
| 10 | Vertebrate MicroRNA genes显示文摘 | Lim LP Glasner ME Yekta S | 2003 | Science2003，299，5612： | 1 |
| 11 | Vertebrate microRNA genes显示文摘 | Lim LP Glasner ME Yekta S | 2003 | Science2003，299，： | 1 |
| 12 | Effect of sintering and melt casting methods on properties of a machinable fluor - phlogopite glass - ceramic 显示文摘 | S KhatibZadeh M Samedani B Eftekhari Yekta | 2008 | J Mater Process Technol2008，203，13： | 1 |
| 13 | Vertebrate microRNA genes显示文摘 | Lim LP Glasner ME Yekta S | 2003 | Science2003，299，2： | 1 |
| 14 | MicroRNA-Directed Cleavage of HOXB8 mRNA 显示文摘 | Yekta S Shih IH Barrel DP | 2004 | Science2004，304，5670： | 1 |
| 15 | Vertebrate mieroRNA genes显示文摘 | Lim LP Glasner ME Yekta S | 2003 | Science2003，299，5612： | 1 |
| 16 | A compari- son of intermolecular and intramolecular excimer forma-tion in detergent solutions:Temperature effects and mi- croviscosity measurements 显示文摘 | Tun-o N J Masayuki Aikawa Ahmad Yekta | 1979 | Journal of the American Chemical Society1979，101，3： | 1 |
| 17 | The microRNAs of Caenorhabditiselegans显示文摘 | Lim L Lau N Weinstein E Abdelhakim A Yekta S Rhoades M Burge C Bartel D | 2003 | Genes & Dev2003，，： | 1 |
| 18 | Vertebrate microRNA genes显示文摘 | Lim L P Glasner M E Yekta S | 2003 | Science2003，299，5612： | 1 |
| 19 | Biosorption of cadmium and lead ions by ethanol treated bakers yeast biomass 显示文摘 | Yekta G Sibel U Ulgar G | 2005 | Bioresour Technol2005，96，： | 1 |
| 20 | Professional competence:Factors described by nurses as influencing their development显示文摘 | Khomeiran RT Yekta ZP Kiger AM | | 0，，1： | 1 |
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