美国信息科学与技术学会（The American Society for Information Science and Technology,ASIST）年会是国际上信息科学（information science,国内称为＂情报学＂）领域有重要影响的综合性学术年会.在美国路易斯安娜州新奥尔良市举行...美国信息科学与技术学会（The American Society for Information Science and Technology,ASIST）年会是国际上信息科学（information science,国内称为＂情报学＂）领域有重要影响的综合性学术年会.在美国路易斯安娜州新奥尔良市举行的ASIST2011年年会上,学者们共报告了59篇研究论文（full paper）.本文通过综述这些论文的主要研究内容、方法和结果,展示美国主导的情报科学研究的现状、新兴领域和发展趋势,并讨论其三维框架（即人-信息-信息技术所构筑的框架）的学科定位.文章进一步总结该学科研究的特点及为国内情报学研究带来的启示.展开更多
High-quality optical coating is a key technology for modern optics. lon-assisted deposition technology was used to improve the vaporized coating in 1980's. The GIS (gridless ion source), which is an advanced plasm...High-quality optical coating is a key technology for modern optics. lon-assisted deposition technology was used to improve the vaporized coating in 1980's. The GIS (gridless ion source), which is an advanced plasma source for producing a high-quality optical coating in large area, can produce a large area uniformity>1000 mm(diameter), a high ion current density - 0.5mA/cm2, 20 eV - 200 eV energetic plasma ions and can activate reactive gas and film atoms. Now we have developed a GIS system. The GIS and the plasma ion-assisted deposition technology are investigated to achieve a high-quality optical coating. The GIS is a high power and high current source with a power of l kW - 7.5 kW, a current of 10 A - 70 A and an ion density of 200 μA/cm2 - 500 μA/cm2. Because of the special magnetic structure, the plasma-ion extraction efficiency has been improved to obtain a maximum ion density of 500 μA/cm2 in the medium power (- 4kW) level. The GIS applied is of a special cathode structure, so that the GIS operation can be maintained under a rather low power and the lifetime of cathode will be extended. The GIS has been installed in the LPSX-1200 type box coating system. The coated TiO2, SiO2 films such as antireflective films with the system have the same performance reported by Leybold Co, 1992, along with a controllable refractive index and film structure.展开更多
文摘美国信息科学与技术学会（The American Society for Information Science and Technology,ASIST）年会是国际上信息科学（information science,国内称为＂情报学＂）领域有重要影响的综合性学术年会.在美国路易斯安娜州新奥尔良市举行的ASIST2011年年会上,学者们共报告了59篇研究论文（full paper）.本文通过综述这些论文的主要研究内容、方法和结果,展示美国主导的情报科学研究的现状、新兴领域和发展趋势,并讨论其三维框架（即人-信息-信息技术所构筑的框架）的学科定位.文章进一步总结该学科研究的特点及为国内情报学研究带来的启示.
文摘High-quality optical coating is a key technology for modern optics. lon-assisted deposition technology was used to improve the vaporized coating in 1980's. The GIS (gridless ion source), which is an advanced plasma source for producing a high-quality optical coating in large area, can produce a large area uniformity>1000 mm(diameter), a high ion current density - 0.5mA/cm2, 20 eV - 200 eV energetic plasma ions and can activate reactive gas and film atoms. Now we have developed a GIS system. The GIS and the plasma ion-assisted deposition technology are investigated to achieve a high-quality optical coating. The GIS is a high power and high current source with a power of l kW - 7.5 kW, a current of 10 A - 70 A and an ion density of 200 μA/cm2 - 500 μA/cm2. Because of the special magnetic structure, the plasma-ion extraction efficiency has been improved to obtain a maximum ion density of 500 μA/cm2 in the medium power (- 4kW) level. The GIS applied is of a special cathode structure, so that the GIS operation can be maintained under a rather low power and the lifetime of cathode will be extended. The GIS has been installed in the LPSX-1200 type box coating system. The coated TiO2, SiO2 films such as antireflective films with the system have the same performance reported by Leybold Co, 1992, along with a controllable refractive index and film structure.
