中国科学院机构知识库网格系统: 检索

Potassium-Promoted Three-Dimensional Mesoporous Pt/MnO2 for Formaldehyde Elimination at Zero Degree 期刊论文 OAI收割
JOURNAL OF THE CHEMICAL SOCIETY OF PAKISTAN, 2020, 卷号: 42, 期号: 2, 页码: 188-203
作者: Guan, Shengnan; Li, Wenzhi; Ma, Jianru; Liu, Qingchuan; Chen, Kun

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收藏 | 浏览/下载：21/0 | 提交时间：2020/10/29

Low-temperature Formaldehyde oxidation K/Pt-promoted Catalytic Activity Environment

The design of the force actuator used in extreme low temperature environment 会议论文 OAI收割
Montréal, Quebec, Canada, 2014-6-22
作者: Yu Ye; Bozhong Gu; Xiaolong Han

收藏 | 浏览/下载：32/0 | 提交时间：2015/03/13

force actuator active support passive support low temperature environment Piezoelectric ceramic

Analysis, testing and control of telescope’s high-precision drive system in low-temperature environment 会议论文 OAI收割
Montréal, Quebec, Canada, 2014-6-22
作者: DU Fu-Jia; WEN Hai-Kun; ZHANG Jian

收藏 | 浏览/下载：34/0 | 提交时间：2015/03/12

Low temperature environment Lubricating Precision driving Friction feedforward

A study of the evolution of rust on weathering steel submitted to the Qinghai salt lake atmospheric corrosion 期刊论文 OAI收割
Materials Chemistry and Physics, 2013, 卷号: 139, 期号: 1, 页码: 225-232
J. Wang; Z. Y. Wang; W. Ke

收藏 | 浏览/下载：12/0 | 提交时间：2013/12/24

Metals Electron microscopy Energy dispersive analysis of X-rays Electrochemical techniques Corrosion low-alloy steels carbon-steel electrochemical-impedance marine-environment protective ability room-temperature oxide-films mechanism iron reduction

Highly expanded flashing liquid jets in vacuum environment 会议论文 OAI收割
Beijing, China, September 23, 2013 - September 27, 2013
作者: Du WF(杜王芳); Zhao JF(赵建福)

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收藏 | 浏览/下载：30/0 | 提交时间：2018/11/08

Environmental management Evaporation Fighter aircraft Jets Nozzles Shock waves Solenoid valves Solenoids Syringes Testing Environmental control system Environmental pressures Flashing liquid jets Initial temperatures Injection temperature Low pressure environment Pressurized liquids Saturation pressure

Design and experimental research of a new type focus mechanism used in space-based telescope (EI CONFERENCE) 会议论文 OAI收割
2012 9th IEEE International Conference on Mechatronics and Automation, ICMA 2012, August 5, 2012 - August 8, 2012, Chengdu, China
作者: Wang D.

收藏 | 浏览/下载：40/0 | 提交时间：2013/03/25

The position of focal plane will be changed because of temperature fluctuation and vacuum environment. In order to make the telescope work well positioning accuracy of the mechanism is 0.008mm. The performance satisfies the need of precision a focusing mechanism is needed. To majority of large space-based telescopes and the scheme design is reasonable and practicable. 2012 IEEE. the general way to do this would be to use a reflector which was located in the backfocal distance. One of typical schemes of this mechanism was introduced however because of the big axial size the mechanism can't be used when the size of the enclosure was limited. A new type of focusing mechanism was introduced which has such advantages of small size high accuracy and low mass. The design and test methods had been discussed. According to the results the repeatability positioning accuracy is 0.0025mm

Characterisation of rust formed on carbon steel after exposure to open atmosphere in Qinghai salt lake region 期刊论文 OAI收割
Corrosion Engineering Science and Technology, 2012, 卷号: 47, 期号: 2, 页码: 125-130
J. Wang; Z. Y. Wang; W. Ke

收藏 | 浏览/下载：43/0 | 提交时间：2013/02/05

Carbon steel Atmospheric corrosion SEM Rust layer low-alloy steels weathering steel protective ability corrosion products room-temperature mechanism iron reduction environment layers

Design and test of focusing mechanism of space camera (EI CONFERENCE) 会议论文 OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Design, Manufacturing, and Testing of Micro- and Nano-Optical Devices and Systems, April 26, 2010 - April 29, 2010, Dalian, China
作者: Li Y.; Li Y.; Li Y.; Wang H.; Wang H.

收藏 | 浏览/下载：33/0 | 提交时间：2013/03/25

According to the focal depth and work environment of a space camera a focusing mechanism is designed which consists of precision screw ball transmission and linear bearing guidance and accuracy improving. The dynamic- strike- resistance adaptability to temperature and vacuum are considered into the reliable design method. Furthermore the linearity error the structure stability and the mechanism work situation in high and low temperature are tested. The result is that the linearity error of the mechanism is less than 0.003 mm and the sway error of vertical way and level way of the mirror is less than 20''. The linearity error of the mechanism and the sway error of the mirror remain unchanged after vibration test. The mechanism can work in the complex space environment. 2010 SPIE.

Corrosion behaviour of weathering steel in diluted Qinghai salt lake water in a laboratory accelerated test that involved cyclic wet/dry conditions 期刊论文 OAI收割
Materials Chemistry and Physics, 2010, 卷号: 124, 期号: 2-3, 页码: 952-958
J. Wang; Z. Y. Wang; W. Ke

收藏 | 浏览/下载：17/0 | 提交时间：2012/04/13

Elements Corrosion test Electrochemical techniques Electron probe low-alloy steels atmospheric corrosion carbon-steel electrochemical impedance room-temperature rust layers iron mechanism products environment

The calibration of faint simulation star magnitude based on single photon count technique (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2009: Advances in Imaging Detectors and Applications, June 17, 2009 - June 19, 2009, Beijing, China
作者: Xu S.-Y.; Guo J.; Guo J.

收藏 | 浏览/下载：35/0 | 提交时间：2013/03/25

A calibration method of faint star magnitude of the star scene simulation device is proposed in this paper. In the research of simulation star magnitude luminometers and CCD devices are the general calibration devices which are used to measure the illumination intensity and calibrate its magnitude. But if the simulation magnitude is only sixth magnitude its illumination intensity is only 1.010-8 Lux. This illumination intensity level is the lowest illumination intensity that the commercial luminometer can detect. Hence the simulation star magnitude lower than six magnitude cannot be calibrated by luminoters. Likewise CCD devices also need an additive cooler in this case. When the single photon characteristic is presented due to the low luminosity of simulating light sources the simulation star magnitude can be calibrated by detecting its photon flux of radiation with the method of single photon count. In this paper the detection principle of single photon based on a compact designed PMT detecting of the radiation level of simulation star magnitude is advanced. Especially a spectrum match method is proved theoretically to be an effective means for selecting PMT photosensitive type. In the case of the detection object of the simulation star in visible wavelength a analysis indicates that the material of tri-alkali cathode materials its best choice after being compared the Signal-to-Noise of photon detector of several PMT photosensitive materials based on the different spectrum match ratio of different object light sources and different cathode materials. An experiment is employed to show the relationship of control voltage of PMT and its dark counter the relationship of the environment temperature of PMT and its dark counter which proves its only decades of CPS at room temperature. The so low dark counter avoids a bulky cooler and is convenient for installing it on the star scene simulation equipment. Finally in the experiment of calibrating the simulation star magnitudes the ability of its calibration is confirmed to reaches up to 12m meanwhile its calibration error is within 0.2m. 2009 SPIE.