survey of information security risk assessment

信息安全风险评估是信息系统安全工程的重要组成部分,是建立信息系统安全体系的基础和前提。本文分析了信息安全风险评估所涉及的主要内容,包括国内外现状、评估体系模型、评估标准、评估方法、评估过程等,探讨了国内外测评体系,指出了目前信息安全风险评估需要解决的问题,展望了信息安全风险评估的发展前景

Effect of calcination temperature on the structure of the ZrO2 microspheres synthesized by quasi-gaseous state reaction

The ZrO2 microspheres with a smooth surface have been successfully synthesized by a novel quasi-gaseous state reaction method. The scanning electron microscopy, transmission electron microscopy, and X-ray diffraction have been used to evaluate the structure of synthesized ZrO2 microspheres. The calcination temperature has a significant effect on the structure: after they were calcinated at 600 similar to 800 degrees C, the synthesized ZrO2 microspheres possess the homogeneous porous structure with peanut-like nano-grains, which consist of major c-ZrO2 and minor t-ZrO2 phases

准气相反应法中煅烧温度对ZrO_2微球结构特性的影响

采用新颖的准气相反应法,合成出了球形度好、表面光滑的ZrO_2微球.通过对产物的SEM,TEM和XRD表征,研究了煅烧温度对ZrO_2球结构特性的影响.结果表明:经600～800℃煅烧后,生长完好的ZrO_2球,其显微结构为均匀多孔结构,纳米晶粒呈花生样的长条形状;ZrO_2球的相由主要的立方相和少量的四方相组成

准气相反应法中煅烧温度对zro2微球结构特性的影响

The ZrO2 microspheres with a smooth surface have been successfully synthesized by a novel quasi-gaseous state reaction method. The scanning electron microscopy, transmission electron microscopy, and X-ray diffraction have been used to evaluate the structure of synthesized ZrO2 microspheres. The calcination temperature has a significant effect on the structure: after they were calcinated at 600 similar to 800 degrees C, the synthesized ZrO2 microspheres possess the homogeneous porous structure with peanut-like nano-grains, which consist of major c-ZrO2 and minor t-ZrO2 phases

准气相反应法中煅烧温度对zro2微球结构特性的影响

The ZrO2 microspheres with a smooth surface have been successfully synthesized by a novel quasi-gaseous state reaction method. The scanning electron microscopy, transmission electron microscopy, and X-ray diffraction have been used to evaluate the structure of synthesized ZrO2 microspheres. The calcination temperature has a significant effect on the structure: after they were calcinated at 600 similar to 800 degrees C, the synthesized ZrO2 microspheres possess the homogeneous porous structure with peanut-like nano-grains, which consist of major c-ZrO2 and minor t-ZrO2 phases

水热法制备Y↓2O↓3-CeO↓2-ZrO↓2超细陶瓷粉末

采用共沉淀－水热法制备了Ｙ２Ｏ３－ＺｒＯ２（ＹＺ）和Ｙ２Ｏ３－ＣｅＯ２－ＺｒＯ２（ＹＣＺ）超细陶瓷粉末（１０ｎｍ左右）。Ｘ射线衍射分析表明，二元钇和锆及三元钇、铈和锆的共沉淀氢氧化物，经水热处理后均可获得四方相复合氧化物，在１７０￣２５０℃温度下进行水热处理，随着处理温度的提高，其氢氧化物的脱水速率加快，脱水更加完全，粉末粒度增大，有机添加剂如聚乙烯醇对水热产物可起到一定的分散作用

氧化钇和氧化铈稳定氧化锆空心球形陶瓷粉末的研制

采用水热－喷雾干燥法和煅烧－球磨－喷雾干燥法制备了空心球形Ｙ２Ｏ３和ＣｅＯ２稳定的ＺｒＯ２（ＹＣＺ）陶瓷粉末。水热－喷雾干燥工艺流程短，产品纯度高，作为最终选定的方法。用本法所制备的陶瓷粉末热导率低，其涂层具有良好的隔热效果

水热法制备Y_2O_3-CeO_2-ZrO_2超细陶瓷粉末

采用共沉淀－水热法制备了Ｙ２Ｏ３－ＺｒＯ２（ＹＺ）和Ｙ２Ｏ３－ＣｅＯ２－ＺｒＯ２（ＹＣＺ）超细陶瓷粉末（１０ｎｍ左右）．Ｘ射线衍射分析表明，二元钇和锆及三元钇、铈和锆的共沉淀氢氧化物，经水热处理后均可获得四方相复合氧化物．在１７０～２５０℃温度下进行水热处理，随着处理温度的提高，其氢氧化物的脱水速率加快，脱水更加完全，粉末粒度增大．有机添加剂如聚乙烯醇对水热产物可起到一定的分散作用

水热法制备Y↓2O↓3-CeO↓2-ZrO↓2超细陶瓷粉末

采用共沉淀－水热法制备了Ｙ２Ｏ３－ＺｒＯ２（ＹＺ）和Ｙ２Ｏ３－ＣｅＯ２－ＺｒＯ２（ＹＣＺ）超细陶瓷粉末（１０ｎｍ左右）。Ｘ射线衍射分析表明，二元钇和锆及三元钇、铈和锆的共沉淀氢氧化物，经水热处理后均可获得四方相复合氧化物，在１７０￣２５０℃温度下进行水热处理，随着处理温度的提高，其氢氧化物的脱水速率加快，脱水更加完全，粉末粒度增大，有机添加剂如聚乙烯醇对水热产物可起到一定的分散作用

氧化钇和氧化铈稳定氧化锆空心球形陶瓷粉末的研制

采用水热－喷雾干燥法和煅烧－球磨－喷雾干燥法制备了空心球形Ｙ２Ｏ３和ＣｅＯ２稳定的ＺｒＯ２陶瓷粉末，水热－喷雾干燥工艺流程短，产品纯度高，作为最终选定的方法。用本法所制备的陶瓷粉末热导率 ，其涂层具有良好的隔热效果