为了系统认识虚拟现实技术在用户体验设计应用研究的全局概况,运用科学知识图谱的方法,涵盖时间、国家/地区、机构和作者的产出情况、研究热点聚类、知识基础以及研究演化等多个方面,对Web of Science数据库1998-2022年间的学术文献进...为了系统认识虚拟现实技术在用户体验设计应用研究的全局概况,运用科学知识图谱的方法,涵盖时间、国家/地区、机构和作者的产出情况、研究热点聚类、知识基础以及研究演化等多个方面,对Web of Science数据库1998-2022年间的学术文献进行了分析。结果显示,国际研究里发达国家影响较大,其中高等院校是研究的主要机构;国际研究聚焦于环境(environments)、增强现实(augmented reality)、沉浸感(immersion)等;教育、虚拟环境、用户满意度以及可用性成为近几年国际研究热点;国际研究的关键词聚类可分为#1用户体验(User experience)、#2用户接受度(User acceptance)、#3虚拟环境(Virtual environment)、#4可视化设计(Visual design)4大类。国际研究者未来可关注用户体验环境或服务的设计理念、沉浸式体验、交互设计以及增强现实等方面。展开更多
Superhydrophobic surface was prepared on the zinc substrate by chemical solution method via immersing clean pure zinc substrate into a water solution of zinc nitrate hexahydrate[Zn（NO3）2.6H2O] and hexamethylenete- t...Superhydrophobic surface was prepared on the zinc substrate by chemical solution method via immersing clean pure zinc substrate into a water solution of zinc nitrate hexahydrate[Zn（NO3）2.6H2O] and hexamethylenete- traamine（C6H12N4） at 95 ℃ in water bath for 1.5 h, then modified with 18 alkanethiol. The best resulting surface shows superhydrophobic properties with a water contact angle of about 158° and a low water roll-off angle of around 3°. The prepared samples were characterized by powder X-ray diffraction（XRD）, X-ray photoelectron spectroscopy （XPS）, energy-dispersive X-ray spectroscopy（EDX）, transmission electron microscopy（TEM）, and scanning electron microscopy（SEM）. SEM images of the films show that the resulting surface exhibits flower-shaped micro- and nano-structure. The surfaces of the prepared films were composed of ZnO nanorods which were wurtzite structure. The special flower-like micro- and nano-structure along with the low surface energy leads to the surface superhydro- phobicity.展开更多
We report the solution fabrication of a MgB2 coated conductor on a stainless steel substrate.The precursor solution of Mg(BH_(4))^(2) diethyl ether is initially synthesized by refluxing the milled mixture of NaBH4 and...We report the solution fabrication of a MgB2 coated conductor on a stainless steel substrate.The precursor solution of Mg(BH_(4))^(2) diethyl ether is initially synthesized by refluxing the milled mixture of NaBH4 and MgCl_(2) in diethyl ether.Then the Mg(BH4)2 diethyl ether is spin coated on a stainless steel substrate and annealed in Mg vapor,which yields a homogeneous MgB_(2) coated conductor.X-ray diffraction indicates that the grown MgB_(2) coated conductor is polycrystalline.It has a superconducting transition temperature of 34-37K.The slope of the upper critical field HC_(2) increases with decreasing temperature,and the extrapolated value of Hc2 (0)reaches ~28 T.The critical current density estimated by the Bean model is JC (25K,0 T)~1 06 A.cm^(-2).These parameters indicate that the solution method is potentially able to produce MgB_(2) coated conductors that can satisfy application purposes.展开更多
基金Supported by the National Natural Science Foundation of China(Nos.20773014,20933001)
文摘Superhydrophobic surface was prepared on the zinc substrate by chemical solution method via immersing clean pure zinc substrate into a water solution of zinc nitrate hexahydrate[Zn（NO3）2.6H2O] and hexamethylenete- traamine（C6H12N4） at 95 ℃ in water bath for 1.5 h, then modified with 18 alkanethiol. The best resulting surface shows superhydrophobic properties with a water contact angle of about 158° and a low water roll-off angle of around 3°. The prepared samples were characterized by powder X-ray diffraction（XRD）, X-ray photoelectron spectroscopy （XPS）, energy-dispersive X-ray spectroscopy（EDX）, transmission electron microscopy（TEM）, and scanning electron microscopy（SEM）. SEM images of the films show that the resulting surface exhibits flower-shaped micro- and nano-structure. The surfaces of the prepared films were composed of ZnO nanorods which were wurtzite structure. The special flower-like micro- and nano-structure along with the low surface energy leads to the surface superhydro- phobicity.
基金Supported by the National Basic Research Program of China under Grant Nos 2006CD601004 and 2011CB605904.
文摘We report the solution fabrication of a MgB2 coated conductor on a stainless steel substrate.The precursor solution of Mg(BH_(4))^(2) diethyl ether is initially synthesized by refluxing the milled mixture of NaBH4 and MgCl_(2) in diethyl ether.Then the Mg(BH4)2 diethyl ether is spin coated on a stainless steel substrate and annealed in Mg vapor,which yields a homogeneous MgB_(2) coated conductor.X-ray diffraction indicates that the grown MgB_(2) coated conductor is polycrystalline.It has a superconducting transition temperature of 34-37K.The slope of the upper critical field HC_(2) increases with decreasing temperature,and the extrapolated value of Hc2 (0)reaches ~28 T.The critical current density estimated by the Bean model is JC (25K,0 T)~1 06 A.cm^(-2).These parameters indicate that the solution method is potentially able to produce MgB_(2) coated conductors that can satisfy application purposes.
