针对纳米ZnO在制备以及使用的过程中极易发生团聚从而影响其抗菌性能这一缺点,设计实验使得纳米ZnO在溶胶凝胶过程中与多孔SiO2进行复合。通过扫描电子显微镜(Scanning electron microscope, SEM)以及透射电子显微镜(Transmission elect...针对纳米ZnO在制备以及使用的过程中极易发生团聚从而影响其抗菌性能这一缺点,设计实验使得纳米ZnO在溶胶凝胶过程中与多孔SiO2进行复合。通过扫描电子显微镜(Scanning electron microscope, SEM)以及透射电子显微镜(Transmission electron microscopy, TEM)等可以发现,ZnO很好地复合在多孔SiO2的骨架上并且分散得较为均匀。通过表面积测试(Brunner-emmet-teller measurement, BET)以及光致发光光谱(Photoluminescence spectrum,PL)的测试可以发现,复合材料的比表面积得到提高且光学性能加强。通过菌落计数法探究复合材料与单组分纳米ZnO的抗菌性能差异以及复合材料中纳米ZnO含量的变化导致的抗菌性能的变化。结论证明,当纳米ZnO与多孔SiO2进行复合之后,材料的抗菌性能得到了极大的提高,抑菌率超过了99%。展开更多
目的研究胃癌患者长链非编码RNA(lncRNA)表达与胃癌临床特征及预后相关性。方法计算机检索PubMed、EMbase、Web of Science数据库,检索时间截至2019年4月。根据检索策略及纳入、排除标准对文献进行筛选,并提取相关资料数据。使用Stata...目的研究胃癌患者长链非编码RNA(lncRNA)表达与胃癌临床特征及预后相关性。方法计算机检索PubMed、EMbase、Web of Science数据库,检索时间截至2019年4月。根据检索策略及纳入、排除标准对文献进行筛选,并提取相关资料数据。使用Stata软件进行meta分析。结果本研究最终纳入18篇文献。lncRNA高表达组患胃癌风险是低表达组的1.510倍(HR=1.510,95%CI:1.213~1.878,P=0.000)。meta分析结果显示文献存在发表偏倚。lncRNA表达水平与胃癌患者的TNM分期(HR=1.981,95%CI:1.458~2.692,P=0.000)、肿瘤分化程度(HR=1.273,95%CI:1.103~1.469,P=0.001)、浸润深度(HR=1.862,95%CI:1.565~2.216,P=0.000)、淋巴结转移(HR=1.570,95%CI:1.086~2.270,P=0.016)、远处转移(HR=2.581,95%CI:1.503~4.430,P=0.001)相关性明显。结论lncRNA与胃癌患者预后不良以及临床病理特征相关,可能成为胃癌患者预后以及病情监控的重要指标,但其临床应用价值还需在未来更多研究中予以证实。展开更多
Multilayer iridium coating was manufactured on tungsten carbide substrates by a double glow plasma process.As comparison,monolayer was also produced.The microstructure and morphology were observed using scanning elect...Multilayer iridium coating was manufactured on tungsten carbide substrates by a double glow plasma process.As comparison,monolayer was also produced.The microstructure and morphology were observed using scanning electron microscopy.Grain orientation and phase were determined using X-ray diffraction.The residual stress of the coating was studied by glancing incidence X-ray diffraction.The adhesive force of the coating was measured by a scratch tester.The results showed that both monolayer and multilayer had a polycrystalline phase with a strong（110） reflection.The coating had an excellent adhesion with no evidence of delamination.The adhesive force of the monolayer and multilayer was about 50 and 43 N,respectively.The interfacial reaction between the substrate and the layer occurred and a new WIr phase was found due to the high-temperature deposition process.The residual stress in the monolayer and multilayer was-1.6 and-1.1 GPa,respectively.展开更多
With the increasing of users and the demands which are transforming from the monotonous traditional service to network service,Multiple space environment web applications including browser-client,rich-client and mobil...With the increasing of users and the demands which are transforming from the monotonous traditional service to network service,Multiple space environment web applications including browser-client,rich-client and mobile-client applications have been developed by SEPC(Space Environment Prediction Center,NSSC,CAS)during the past few years.The architecture of Operational Space Environment Technology System(OSETS) that these applications rely on is described and the description of structural optimization of the architecture is provided.To demonstrate the evolution of the OSETS,three web application examples for e SpaceWx,Space Weather Situation Awareness Picture(SWSAP),Plug-and-Play SWx Analysis and Plotting Program(PPSWAP) are presented.展开更多
Pt and Ir coatings were produced by double glow plasma technology on the surface of Ti alloy substrates. The chemical compositions of the coatings were determined by X-ray diffraction and X-ray photoelectron spectrosc...Pt and Ir coatings were produced by double glow plasma technology on the surface of Ti alloy substrates. The chemical compositions of the coatings were determined by X-ray diffraction and X-ray photoelectron spectroscopy. The microstructure and morphology of the coatings were observed by scanning electron microscopy. The hardness and elastic modulus of the coatings were estimated by nanoindentation. The measurements of adhesive forces of the coatings were performed with scratch tester. The results indicated that the Pt and Ir coatings displayed the preferred (220) orientation due to the initial nuclei with preferred growth on the surface of the substrates. The interface between the Pt coating and substrate exhibited no evidence of delamination. The Ir coating was composed of irregular columnar grains with many nanovoids at the interface between the coating and substrate. The mean values of hardness for Pt and Ir coatings were 0.9 GPa and 9 GPa, respectively. The elastic modulus of Pt and Ir coatings were 178 GPa and 339 GPa, respectively. The adhesive forces of the Pt and Ir coatings were about 66.4 N and 55 N, respectively. The Pt and Ir coatings adhered well to the Ti alloy substrates.展开更多
文摘针对纳米ZnO在制备以及使用的过程中极易发生团聚从而影响其抗菌性能这一缺点,设计实验使得纳米ZnO在溶胶凝胶过程中与多孔SiO2进行复合。通过扫描电子显微镜(Scanning electron microscope, SEM)以及透射电子显微镜(Transmission electron microscopy, TEM)等可以发现,ZnO很好地复合在多孔SiO2的骨架上并且分散得较为均匀。通过表面积测试(Brunner-emmet-teller measurement, BET)以及光致发光光谱(Photoluminescence spectrum,PL)的测试可以发现,复合材料的比表面积得到提高且光学性能加强。通过菌落计数法探究复合材料与单组分纳米ZnO的抗菌性能差异以及复合材料中纳米ZnO含量的变化导致的抗菌性能的变化。结论证明,当纳米ZnO与多孔SiO2进行复合之后,材料的抗菌性能得到了极大的提高,抑菌率超过了99%。
文摘目的研究胃癌患者长链非编码RNA(lncRNA)表达与胃癌临床特征及预后相关性。方法计算机检索PubMed、EMbase、Web of Science数据库,检索时间截至2019年4月。根据检索策略及纳入、排除标准对文献进行筛选,并提取相关资料数据。使用Stata软件进行meta分析。结果本研究最终纳入18篇文献。lncRNA高表达组患胃癌风险是低表达组的1.510倍(HR=1.510,95%CI:1.213~1.878,P=0.000)。meta分析结果显示文献存在发表偏倚。lncRNA表达水平与胃癌患者的TNM分期(HR=1.981,95%CI:1.458~2.692,P=0.000)、肿瘤分化程度(HR=1.273,95%CI:1.103~1.469,P=0.001)、浸润深度(HR=1.862,95%CI:1.565~2.216,P=0.000)、淋巴结转移(HR=1.570,95%CI:1.086~2.270,P=0.016)、远处转移(HR=2.581,95%CI:1.503~4.430,P=0.001)相关性明显。结论lncRNA与胃癌患者预后不良以及临床病理特征相关,可能成为胃癌患者预后以及病情监控的重要指标,但其临床应用价值还需在未来更多研究中予以证实。
基金Funded by the National Natural Science Foundation of China(No.50872055/E020703)the Natural Science Foundation of Jiangsu Province(No.BK20150260)
文摘Multilayer iridium coating was manufactured on tungsten carbide substrates by a double glow plasma process.As comparison,monolayer was also produced.The microstructure and morphology were observed using scanning electron microscopy.Grain orientation and phase were determined using X-ray diffraction.The residual stress of the coating was studied by glancing incidence X-ray diffraction.The adhesive force of the coating was measured by a scratch tester.The results showed that both monolayer and multilayer had a polycrystalline phase with a strong（110） reflection.The coating had an excellent adhesion with no evidence of delamination.The adhesive force of the monolayer and multilayer was about 50 and 43 N,respectively.The interfacial reaction between the substrate and the layer occurred and a new WIr phase was found due to the high-temperature deposition process.The residual stress in the monolayer and multilayer was-1.6 and-1.1 GPa,respectively.
文摘With the increasing of users and the demands which are transforming from the monotonous traditional service to network service,Multiple space environment web applications including browser-client,rich-client and mobile-client applications have been developed by SEPC(Space Environment Prediction Center,NSSC,CAS)during the past few years.The architecture of Operational Space Environment Technology System(OSETS) that these applications rely on is described and the description of structural optimization of the architecture is provided.To demonstrate the evolution of the OSETS,three web application examples for e SpaceWx,Space Weather Situation Awareness Picture(SWSAP),Plug-and-Play SWx Analysis and Plotting Program(PPSWAP) are presented.
基金supported by the National Natural Science Foundation of China(50872055/E020703)Funding for Outstanding Doctoral Dissertation in NUAA(BCXJ1109)the Funding of Jiangsu Innovation Program for Graduate Education(CXLX11_0207)
文摘Pt and Ir coatings were produced by double glow plasma technology on the surface of Ti alloy substrates. The chemical compositions of the coatings were determined by X-ray diffraction and X-ray photoelectron spectroscopy. The microstructure and morphology of the coatings were observed by scanning electron microscopy. The hardness and elastic modulus of the coatings were estimated by nanoindentation. The measurements of adhesive forces of the coatings were performed with scratch tester. The results indicated that the Pt and Ir coatings displayed the preferred (220) orientation due to the initial nuclei with preferred growth on the surface of the substrates. The interface between the Pt coating and substrate exhibited no evidence of delamination. The Ir coating was composed of irregular columnar grains with many nanovoids at the interface between the coating and substrate. The mean values of hardness for Pt and Ir coatings were 0.9 GPa and 9 GPa, respectively. The elastic modulus of Pt and Ir coatings were 178 GPa and 339 GPa, respectively. The adhesive forces of the Pt and Ir coatings were about 66.4 N and 55 N, respectively. The Pt and Ir coatings adhered well to the Ti alloy substrates.
