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光触媒技术原理与国内研究现状 被引量:3
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作者 史乔升 汪光文 +1 位作者 程湛 张存 《科技视界》 2017年第1期14-15,共2页
光触媒技术是一项新兴的空气净化技术。本文对光触媒技术的原理进行了介绍,并按照装置类型对国内的光触媒研究进行了介绍,探讨了拓展反应表面的不同方式。本文为之后此领域的研究提供了一定的借鉴意义。
关键词 光触 催化氧化
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新型光触针式表面粗糙度测量系统 被引量:8
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作者 杨春兰 浦昭邦 +1 位作者 叶会英 阮学文 《宇航计测技术》 CSCD 1999年第5期55-59,共5页
介绍一种基于光驱聚焦检测技术的光触针式表面粗糙度测量系统。测量光束聚焦在被测表面上,当表面高度变化时,音圈电机驱动聚焦物镜移动,使光点始终聚焦在被测表面上,音圈电机的移动量就反映了表面高度的变化。该系统的垂直分辨力可... 介绍一种基于光驱聚焦检测技术的光触针式表面粗糙度测量系统。测量光束聚焦在被测表面上,当表面高度变化时,音圈电机驱动聚焦物镜移动,使光点始终聚焦在被测表面上,音圈电机的移动量就反映了表面高度的变化。该系统的垂直分辨力可达0.01μm,不仅适用于表面粗糙度测量,还可用于1mm范围内的相对长度测量。 展开更多
关键词 表面粗糙度 光触 音圈电机 测重
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用光触针测量表面粗糙度 被引量:2
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作者 蒋庆全 《航空计测技术》 1993年第4期15-19,共5页
关键词 表面粗糙率 光触 测量
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基于光聚焦探测法的表面粗糙度非接触测量系统 被引量:4
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作者 余慧 谢铁邦 刘晓军 《计量技术》 北大核心 1998年第9期3-4,21,共3页
本文介绍了基于光聚焦探测法的表面粗糙度非接触测量系统。该系统特别适合于接触测量易引起表面损害的软材料,如橡胶、纸张、磁带;硬材料,如硬金属、陶瓷;以及软材料覆盖表面,如磁盘等。
关键词 非接测量 光触 焦点跟踪 表面 粗糙度
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光触媒:等待中国人来开掘的“金矿”
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作者 王信川 《经济》 2005年第12期96-98,共3页
今年9月,广州市一家肯德基餐厅被周边居民多次到环保部门投诉,因为其每小时上万立方米的排放烟气严重影响了周边居民的生活,年底时还很有可能通不过环保部门的检测。一个偶然的机会,餐厅负责人接触到了广州门德纳米科技有限公司,... 今年9月,广州市一家肯德基餐厅被周边居民多次到环保部门投诉,因为其每小时上万立方米的排放烟气严重影响了周边居民的生活,年底时还很有可能通不过环保部门的检测。一个偶然的机会,餐厅负责人接触到了广州门德纳米科技有限公司,门德公司专门为其设计了一套在市场上还见不到的设备,效果出乎预料地好,正如该餐厅经理所说,“经过净化后的烟气,与坐在室内用餐时闻到的气味差不多。” 展开更多
关键词 门德纳米科技公司 中国 光触 产业结构 生活方式 环境保护
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第三代“绿太阳”光触煤系列环保产品上市
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《健康世界》 2004年第7期94-94,共1页
北京国兴绿憬环保科技公司量近推出了第三代“绿太阳”光触煤系列环保产品,包括空调除菌清洗剂,车用防护净化剂和光触煤溶胶。
关键词 光触煤系列环保产品 空调除菌清洗剂 车用防护净化剂 光触煤溶胶
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日本TIO触光膜登陆我国
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《中国采购与招标工程建设与施工通讯》 2003年第7期17-17,共1页
关键词 日本 TIO 环保产品 脱息
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具有高空间分辨力的整形环形光式差动共焦测量法
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作者 冯政德 赵维谦 邱丽荣 《应用光学》 CAS CSCD 2007年第4期488-495,共8页
提出一种新的具有高空间分辨力的整形环形光式差动共焦测量方法。该方法通过整形环形光式共焦测量法和锐化爱里斑主瓣,改善系统横向分辨力;通过差动共焦测量法改善系统的轴向分辨力,最终达到提高系统空间分辨能力的目的。理论分析和实... 提出一种新的具有高空间分辨力的整形环形光式差动共焦测量方法。该方法通过整形环形光式共焦测量法和锐化爱里斑主瓣,改善系统横向分辨力;通过差动共焦测量法改善系统的轴向分辨力,最终达到提高系统空间分辨能力的目的。理论分析和实验表明:整形环形光内孔归一化半径ε越大,横向分辨力改善越明显,量程扩展范围越宽;当入射光波长=λ632.8 nm,物镜数值孔径取NA=0.85,=ε0.5时,该系统的横向分辨力优于0.2μm,轴向分辨力优于2 nm。该方法为光触针测量系统空间分辨力的提高提供了1种新的方法,可广泛应用于超精密三维微细结构工件的超精密测量。 展开更多
关键词 差动共焦测量 共焦显微镜 光触针测量
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一种非接触式表面形貌测量系统的研究 被引量:9
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作者 谭惇 张鄂 +2 位作者 金增伟 马石林 林建荣 《上海交通大学学报》 EI CAS CSCD 北大核心 1996年第3期166-172,共7页
介绍了一种非接触式的表面三维形貌测量系统,该系统采用了光学离焦原理中的象散法.从激光束光学中简洁的ABCD定律出发,分析并获得了系统的特性曲线,这比采用几何光学方法得到的结果更接近实际情况.在±5μm的线性范围内... 介绍了一种非接触式的表面三维形貌测量系统,该系统采用了光学离焦原理中的象散法.从激光束光学中简洁的ABCD定律出发,分析并获得了系统的特性曲线,这比采用几何光学方法得到的结果更接近实际情况.在±5μm的线性范围内,系统的噪声在±6nm范围内.通过对几种标准样板的实测,得到了与实际相符的结果.最后给出了表面三维形貌的测量结果. 展开更多
关键词 光触 象散法 表面形貌 非接测量
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非接触表面形貌纳米测量仪
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《新材料产业》 2003年第12期78-78,共1页
关键词 非接表面形貌纳米测量仪 表面粗糙度 光触针式测量系统 机械特性
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国外静力触探技术发展现状及未来趋势 被引量:5
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作者 康晓娟 李波 《矿产勘查》 2008年第5期63-65,共3页
介绍了国外静力触探技术的最新发展状况。包括标准静力触探实验探头的结构及分类、孔压静力触探测试、旁压静力触探测试、γ射线测试、电导率静力触探测试、快速光筛检静力触探技术、视频成像静力触探技术以及润滑剂注入技术。
关键词 标准静力探实验 孔压静力探测试 旁压静力探测试 γ射线测试 电导率静力探测试 快速筛检静力探技术 视频成像静力探技术 润滑剂注入技术
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挑战室内污染
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作者 王燕 《环境导报》 2003年第18期9-9,共1页
关键词 室内污染 污染治理 室内换气频度 植物 空气净化装置 光触煤技术
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Experimental comparison between corona and contact poling for EO polymer modulators
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作者 张旭苹 史赞 鲁学军 《Journal of Southeast University(English Edition)》 EI CAS 2005年第4期449-452,共4页
Two different poling techniques-corona poling and contact poling in the backdrop of electro-optic (EO) polymer modulators are compared. A 3-layer structure EO polymer modulator is prepared for the poling. The poling... Two different poling techniques-corona poling and contact poling in the backdrop of electro-optic (EO) polymer modulators are compared. A 3-layer structure EO polymer modulator is prepared for the poling. The poling setups and procedures of these two different methods are given. It is found that a well-controlled precure step is very critical, otherwise it will result in either lower poling efficiency or damaged film. Experimental results show that contact poling does not create severe surface damage as corona poling and poling voltage is much lower, but corona poling provides higher EO effect than contact poling. Besides, contact poling can provide poling size as large as the substrate size. 展开更多
关键词 corona poling contact poling electro-optic polymer MODULATOR
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Experimental study and kinetic analysis of oxidant-free thermal-assisted UV digestion utilizing supported nano-TiO_2 photocatalyst for detection of total phosphorous 被引量:1
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作者 董甜 佟建华 +2 位作者 边超 孙楫舟 夏善红 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第1期93-99,共7页
A novel thermal-assisted ultra-violet(UV) photocatalysis digestion method for the determination of total phosphorus(TP) in water samples was introduced in this work. The photocatalytic experiments for TP digestion wer... A novel thermal-assisted ultra-violet(UV) photocatalysis digestion method for the determination of total phosphorus(TP) in water samples was introduced in this work. The photocatalytic experiments for TP digestion were conducted using a 365 nm wavelength UV light and Ti O2 particles as the photocatalyst. Sodium tripolyphosphate and sodium glycerophosphate were used as the typical components of TP and the digested samples were then determined by spectrophotometry after phosphomolybdenum blue reaction. The effects of operational parameters such as reaction time and temperature were studied for the digestion of TP and the kinetic analysis of two typical components was performed in this paper. The pseudo-first-order rate constants k of two phosphorus compounds at different temperatures were obtained and the Arrhenius equation was employed to explain the effect of temperature on rate constant k. Compared with the conventional thermal digestion method for TP detection, it was found that the temperature was decreased from 120 °C to 60 °C with same conversion rate and time in this thermal-assisted UV digestion method, which enabled the digestion process work at normal pressure. Compared with the individual ultra-violet(UV) photocatalysis process, the digestion time was also decreased from several hours to half an hour using the thermal-assisted UV digestion method. This method will not lead to secondary pollution since no oxidant was needed in the thermal-assisted UV photocatalysis digestion process, which made it more compatible with electrochemical detection of TP. 展开更多
关键词 Thermal-assisted Ultra-violet digestion Ti O2 Oxidant-free Kinetic analysis
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Observation of interface of two kinds of bi-metal composite parts prepared by thixo-forging 被引量:4
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作者 杨昭 周丽 董建雄 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第9期1579-1584,共6页
Two kinds of bi-metal composite parts (Sn-15%Pb and Pb-22%Sn bi-metal system, and Al-7%Si and SiCp/6061 MMC bi-metal system) were prepared by the strain-induced melt activated thixo-forging. The interfaces of the bi... Two kinds of bi-metal composite parts (Sn-15%Pb and Pb-22%Sn bi-metal system, and Al-7%Si and SiCp/6061 MMC bi-metal system) were prepared by the strain-induced melt activated thixo-forging. The interfaces of the bi-metal composites were observed by OM and SEM. The observations show that the semisolid metals keep independence during thixo-forging. The solid phases in the semisolid slurries maintain their original morphologies after thixo-forging. The liquid phases near the interface mix together and form a thin layer. The interfaces are bonded firmly with the metallurgical bonding. No oxide layers are found at the interfaces. Strengths of the interfaces were investigated by the micro-hardness test. The experimental results show that the composite interfaces have high strength. However, the agglomerated enhancing particles cause fine defect on the interface of the Al-7%Si and SiCr/6061 MMC bi-metal composite. 展开更多
关键词 semisolid metal processing bi-metal composite thixo-forming die-forging metal matrix composite
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Direct microwelding of dissimilar glass and Kovar alloy without optical contact using femtosecond laser pulses 被引量:1
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作者 JI Chang-hao HUANG Yu-jia +3 位作者 CHEN Xu JIANG Ji-yan GUO Zhi-jun LONG Yu 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第10期3422-3435,共14页
In the current microwelding process using femtosecond(fs) laser between dissimilar materials,surface polishing and pressure assistance,so-called optical contact,are believed necessary.In this paper,direct welding of s... In the current microwelding process using femtosecond(fs) laser between dissimilar materials,surface polishing and pressure assistance,so-called optical contact,are believed necessary.In this paper,direct welding of soda lime glass and Kovar alloy using a fs laser is investigated to overcome the limit of optical contact.The processing of fs laser welding is comprehensively studied by varying the laser power,welding velocity and the number of welding.The shear joining strength is as high as 2 MPa.The cross-section of glass-Kovar alloy joints,the elemental diffusion and the fracture behavior of welded joints were studied.The results show that the fs laser irradiates the surface of Kovar alloy,micron/nanometer-sized metal particles are generated.These particles perform the role as an adhesive part in the welding process.It is believed that the Si atoms diffuses to Kovar alloy from the glass and partially replaces the Fe^(2+) ions on the surface of Kovar alloy,indicating that the mixing and interdiffusion of materials have occurred during the welding process.Finally,the welded sample was tested and has excellent water resistance and sealing property.Furthermore,to justify that this method can be applied to other stack ups,the glass-copper,the glass-Al6063 and sapphire-ceramic are also welded together.This work greatly simplifies the fs laser microwelding process and promotes its industrial applications,such as optoelectronic devices,medical devices and MEMS. 展开更多
关键词 femtosecond laser microwelding GLASS Kovar alloy optical contact
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Ohmic Contacts to n-Type Al_(0.6)Ga_(0.4)N for Solar-Blind Detectors
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作者 朱雁翎 杜江锋 +6 位作者 罗木昌 赵红 赵文伯 黄烈云 姬洪 于奇 杨谟华 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2008年第9期1661-1665,共5页
We investigate the contact characteristics of bi-layer thin films, Ti(20nm)/Al(200nm) on Si-doped n-type A10.6 Ga0.4 N films grown on sapphire substrate. The surface treatment was aqua regia boiling before metalli... We investigate the contact characteristics of bi-layer thin films, Ti(20nm)/Al(200nm) on Si-doped n-type A10.6 Ga0.4 N films grown on sapphire substrate. The surface treatment was aqua regia boiling before metallization and annealing after metallization at different conditions in N2 ambient. High resolution X-ray diffractometery analysis was carried out on the contacts and the surface interfaces of these conditions were compared. A specific contact resistivity pc was determined using the circular transmission line method via current-voltage measurements. A pc of 3.42 × 10^-4 Ω·cm^2 was achieved when annealed at 670℃ for 90s. Then, this ideal ohmic contact was used in back-illuminated solar-blind AlGaN p- i-n detectors and the detectors' performances, such as spectral responsivity, dark-current,and breakdown voltage were optimized. 展开更多
关键词 high-Al content n-AlGaN ohmic contact ANNEAL back-illumination solar-blind p-i-n detector
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In-situ preparation of TiO_(2)/N-doped graphene hollow sphere photocatalyst with enhanced photocatalytic CO_(2) reduction performance 被引量:4
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作者 Libo Wang Bicheng Zhu +3 位作者 Bei Cheng Jianjun Zhang Liuyang Zhang Jiaguo Yu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2021年第10期1648-1658,共11页
Photocatalytic CO_(2)conversion efficiency is hampered by the rapid recombination of photogenerated charge carriers.It is effective to suppress the recombination by constructing cocatalysts on photocatalysts with high... Photocatalytic CO_(2)conversion efficiency is hampered by the rapid recombination of photogenerated charge carriers.It is effective to suppress the recombination by constructing cocatalysts on photocatalysts with high-quality interfacial contact.Herein,we develop a novel strategy to in-situ grow ultrathin/V-doped graphene(NG)layer on TiO_(2) hollow spheres(HS) with large area and intimate interfacial contact via a chemical vapor deposition(CVD).The optimized TiO^(2)/NG HS nanocomposite achieves total CO_(2)conversion rates(the sum yield of CO,CH_(3)OH and CH_(4))of 18.11μmol·g^(-1)h^(-1),which is about 4.6 times higher than blank T1O_(2)HS.Experimental results demonstrate that intimate interfacial contact and abundant pyridinic N sites can effectively facilitate photogenerated charge carrier separation and transport,realizing enhanced photocatalytic CO_(2)reduction performance.In addition,this work provides an effective strategy for in-situ construction of graphene-based photocatalysts for highly efficient photocatalytic CO_(2)conversion. 展开更多
关键词 Ultrathin N-doped graphene layer Chemical vapor deposition Intimate interfacial contact Photocatalytic CO_(2)reduction Pyridinic N site
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Hybrid Method to Analyze Contact Stress Distribution on Dry Friction Interfaces 被引量:1
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作者 WANG Qin-meng ZHANG Jin +1 位作者 MA Xiao-qiu DONG Ben-han 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2002年第2期77-81,共5页
A hybrid method is established by combining photoelastic experiment and finite element analysis.The method is used to evaluate contact stress distribution on dry friction interfaces,such as the contact interfaces betw... A hybrid method is established by combining photoelastic experiment and finite element analysis.The method is used to evaluate contact stress distribution on dry friction interfaces,such as the contact interfaces between shrouds of fan blades and turbine blades.The photoelastic stress frozen experiment method is used to decide the displacement boundary conditions of numerical calculation.Higher accuracy and efficiency of solving problems are improved by the method.Technical difficulty and high cost of experiment are also avoided by the method.Good agreement of the stress distribution by using the hybrid method and experiment is obtained. 展开更多
关键词 hybrid method contact stress PHOTOELASTICITY moiréinterferometry numerical analysis
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Light energy conversion device for photocatalyst 2.0%WO_3-TiO_2 with oxygen vacancies for water splitting
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作者 童海霞 陈启元 +1 位作者 胡慧萍 尹周澜 《Journal of Central South University》 SCIE EI CAS 2010年第5期943-946,共4页
Using carbon felt, polytetrafluoroethylene latex and powder catalyst to assembly a light energy conversion device, the photocatalytic activity of catalyst 2.0%WO3-TiO2 (2%WO3 compounding TiO2) with oxygen vacancies ... Using carbon felt, polytetrafluoroethylene latex and powder catalyst to assembly a light energy conversion device, the photocatalytic activity of catalyst 2.0%WO3-TiO2 (2%WO3 compounding TiO2) with oxygen vacancies was studied through the water splitting for O2 evolution, using a high pressure mercury lamp as the light source and Fe^3+ as the electron acceptor in two different devices: an ordinary photolysis device with catalyst powder suspending through a magnetic stirrer and a self-assembly light energy conversion device. The results show that after 12 h irradiation, the photocatalytic activity of 2.0%WO3-TiO2 with oxygen vacancies in the self-assembly light energy conversion device is higher than that of the ordinary photolysis device, and the amount of oxygen evolution is about 12 and 9 mmol/L respectively in these two devices. After 12 h, the rates of 02 evolution are slow in each device and the photocatalyst almost loses the photoactivity in the ordinary photolysis device. So, compared with the ordinary photocatalytic device, the rate of oxygen evolution and the life time of the catalyst are improved in the self-assembly light energy conversion device. 展开更多
关键词 light energy conversion device photocatalytic activity 02 evolution oxygen vacancy photo splitting water
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