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| 1 | Effects of Sc, Zr and Tion the microstructure and properties of Al alloys with high Mg content显示文摘The effects of trace Sc, Zr, and Ti on the microstructure and hardness of Al alloys with high Mg content (Al-6Mg, Al-8Mg, and Al-10Mg) were studied by optical microscope, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Brinell hardness. The grain size of the ascast alloys was refined by the addition of Sc and Zr, and it was further refined by the addition of Ti. With the same contents of Sc, Zr, and Ti, an increase in Mg content was beneficial to the refinement due to the solution of Mg into α-Al. The refined microstructures of the as-cast alloys were favorable for Brinell hardness. Addition of Sc, Zr, and Ti to the Al-10Mg alloy results in the improvement of peak hardness and it is about 45% higher than that of the Al-10Mg alloy, which is due to fine precipitations of Al3(Sc1-xZrx), Al3(Sc1-xTix), and Al3(Sc1-x-yZrxTiy). | WANG Xu CHEN Guoqin LI Bing WU Lianmei JIANG Darning | 2010 | Rare Metals2010，29，1： | 18 |
| 2 | Maxillary first premolars:Ⅰ.Morphology of the apical constriction显示文摘Objective: To investigated the apical constriction morphology of maxillary first premolars in the Chinese population. Methods: Eighty recently extracted human maxillary first premolars from a native Chinese population were used. The number and shape of apical constrictions were recorded under a dental operating microscope (DOM) at 12.5×2.5 magnification. After access preparation, a new K-file was inserted into the canal until the tip of the file was just seen at the apical constriction under the DOM. The teeth with files in the canals were X-rayed from a mesiodistal direction using a direct digital radiography (DDR) system, and the distance between the file tip and the center of radiographic apex was directly measured from the computer screen using DDR measurement software. Results: The percentage of teeth with an apical constriction was 78.5% (102/130). The most common apical constriction shapes were oval (55.9%) and round (35.3%). The mean distance between the apical constriction and the anatomical tip of the root was 0.61 mm, and 84.3% (86/102) were within 1 mm. Conclusion: The most common shape of an apical constriction was oval or round, and the distance to the apex was mostly within 1 mm, indicating that root canal therapy should stop 1 mm from the radiographic apex. | Darning Wu Younong Wu Ming Hu | 2009 | Journal of Nanjing Medical University2009，23，6： | 3 |
| 3 | A comparison between radiovisiography and clearing technique in the study of the root canal types显示文摘Objective: To compare the radiovisiography (RVG) with the clearing technique using Kappa value in the study of the root canal types. Methods: One hundred recently extracted human maxillary first premolars were used. Standard periapical RVG images were taken from a buccolingual and mesiodistal direction. The specimens were then accessed, injected with ink, demineralized, dehydrated, and finally were cleared. The RVG images and the transparent teeth were examined by a trained endodontist, and the date of root canal types following Wu’s classification was collected. Results: The reliability of RVG was high for studies on simple root canals, but was poor for the studies on the multiple root canals. The Kappa value between the two techniques was 0.3793, indicating the agreement was poor. Conclusion: It is concluded that the limited value of RVG alone when studying certain aspect of the root canal system. The resolution of the RVG system should be enhanced. | Darning Wu Younong Wu | 2005 | Journal of Nanjing Medical University2005，19，6： | 2 |
| 4 | In situ bubble stretching dispersion mechanism for additives in polymers 显示文摘 | Wu Darning Meng Qingyun Liu Ying | 2003 | Polymer Science ( Part B ) : Polymer Physics2003，41，： | 1 |
| 5 | Analysis of nanogranule dispersion using the ISBS method显示文摘 | Meng Qingyun Zheng Xiuting Wu Darning | 2007 | The European Physical JournalApplied Physics2007，38，： | 1 |
| 6 | Effect of Mg content on the mechanical properties and microstructure of Gf/Al composite显示文摘 | WANG Xu JIANG Darning WU Gaohui | 2008 | Materials Science and Engineering A2008，497，12： | 1 |
| 7 | A study of bubble inflation in polymers and its applications显示文摘 | Qingyun Meng Darning Wu | 2004 | Physics Letter A2004，327，： | 1 |
| 8 | Oseilaltion process of bubble in polymers显示文摘 | Qingyun Meng Darning Wu | 2006 | International Journal of Modern(Physies B)2006，20，18： | 1 |
| 9 | A surface functional monomer directing strategy for highly dense imprinting of TNT at surface of silica nanoparticles显示文摘 | GAO Darning ZHANG Zhongping WU Minghong | 2007 | J Am Chem Soc2007，129，25： | 1 |
| 10 | Analysis of nanogranule dispersion using the ISBS method显示文摘 | Meng Qingyun Zheng Xiuting Wu Darning | 2007 | The European Physical Journal: Applied Physics2007，38，： | 1 |
| 11 | In situ bubble stretching dispersion mechanism for additives in polymers 显示文摘 | Wu Darning Meng Qingyun Liu Ying | 2003 | Polymer Science ( Part B) :Polymer Physics2003，41，： | 1 |
| 12 | Formationmechanism of the macrovoids induced by surfactant additives显示文摘 | Wang Darning Lin Fungching Wu Tiantsair | 1998 | Journal of Membrane Science1998，142，2： | 1 |
| 13 | In situ bubble-stretching dispersion mechanism for additives in polymers显示文摘 | Meng Qingyuu Liu Ying | 2003 | J Polym Sci Phys2003，41，： | 1 |
| 14 | A study of bubble inflation in polymers and its applications显示文摘 | Wu Darning | 2004 | Phys Lett A2004，327，： | 1 |
| 15 | Analysis of nanogranule dispersion using the ISBS method 显示文摘 | Meng Qingyun Zheng Xiuting Wu Darning | 2007 | The European Physical Journal Applied Physics2007，38，： | 1 |
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