中国科学院机构知识库网格系统: 检索

Operational and Spectral Characteristics of a Sr-Ne Glow Discharge Plasma 期刊论文 OAI收割
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING, 2019, 卷号: 44, 期号: 1, 页码: 561-568
作者: Rehan, K.; Nadeem, A.; Hafeez, A.; Khan, M. Z.; Muhammad, R.

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收藏 | 浏览/下载：41/0 | 提交时间：2019/06/24

Strontium plasma Glow discharge Cold plasma Plasma parameters N-e T-exc

Refill friction stir spot welding of 5083-O aluminum alloy 期刊论文 OAI收割
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY, 2018, 卷号: 34, 期号: 5, 页码: 878-885
作者: Xu Zhiwu; Li Zhengwei; Ji Shude; Zhang Liguo

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收藏 | 浏览/下载：21/0 | 提交时间：2021/02/02

MECHANICAL-PROPERTIES MICROSTRUCTURE OPTIMIZATION SHEETS AL PARAMETERS AA6181-T4 FEATURES JOINTS Refill friction stir spot welding Keyhole Secondary phases Microhardness Lap shear failure loada

Refill friction stir spot welding of 5083-O aluminum alloy 期刊论文 OAI收割
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY, 2018, 卷号: 34, 期号: 5, 页码: 878-885
作者: Xu Zhiwu; Li Zhengwei; Ji Shude; Zhang Liguo

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收藏 | 浏览/下载：16/0 | 提交时间：2021/02/02

MECHANICAL-PROPERTIES MICROSTRUCTURE OPTIMIZATION SHEETS AL PARAMETERS AA6181-T4 FEATURES JOINTS Refill friction stir spot welding Keyhole Secondary phases Microhardness Lap shear failure loada

Hardness recovery mechanism in the heat-affected zone during long-term natural aging and its influence on the mechanical properties and fracture behavior of friction stir welded 2024Al-T351 joints 期刊论文 OAI收割
Acta Materialia, 2014, 卷号: 73, 页码: 227-239
Z. Zhang; B. L. Xiao; Z. Y. Ma

收藏 | 浏览/下载：23/0 | 提交时间：2015/01/14

Aluminum alloys Friction stir welding Aging Mechanical properties Microstructure cu-mg alloys aluminum-alloy tensile properties welding parameters reaction-kinetics 2024-t3 aluminum microstructure precipitation strength clusters

Laser cleaning of neutral attenuator plate based on low power laser diode (EI CONFERENCE) 会议论文 OAI收割
2nd International Conference on Energy, Environment and Sustainable Development, EESD 2012, October 12, 2012 - October 14, 2012, Jilin, China
作者: Chen Y.; Li L.

收藏 | 浏览/下载：31/0 | 提交时间：2013/03/25

Laser cleaning is a non-contact green and environmental cleaning method which can effectively remove particulate contaminations of sizes as small as 0.1 m without damage to the optics. But most laser cleaning devices are large and heavy also expensive due to using large lasers such as CO2 laser YAG Laser etc. In this work a low power LD was tried to clean fingerprint and dust contaminated on the surface of the attenuator glasses plates. In the laser cleaning experiment with low power diode the fingerprint grease can be efficient to be cleaned but there is no evident effect for cleaning inorganic dust. The cleaning different degree of fingerprint contaminations was investigated at the variable laser parameters including laser power and irradiation time. An optical microscope was used to analyze the cleaning effect. The results show that low power LD can effectively remove the fingerprint on the surface of absorptive-type attenuator glass plates. On the premise that the attenuator optics glasses are not damaged the cleaning area increases with the increase of radiation time and laser power. The cleaning area doesn't change much with the variation of laser frequency when the other parameters are the same. (2013) Trans Tech Publications Switzerland.

Effect of Temperature on Material Transfer Behavior at Different Stages of Friction Stir Welded 7075-T6 Aluminum Alloy 期刊论文 OAI收割
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY, 2013, 卷号: 29, 期号: 10, 页码: 955-960
作者: Ji S D; Jin Y Y; Yue Y M; Gao S S; Huang Y X

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收藏 | 浏览/下载：12/0 | 提交时间：2021/02/26

MATERIAL FLOW NUMERICAL-SIMULATION ROTATIONAL TOOL MICROSTRUCTURE PARAMETERS EVOLUTION GEOMETRY PLATE PIN Friction stir welding 7075-T6 aluminum alloy Thermal-mechanical affected zone Material transfer Numerical simulation

Experiments and finite element simulations on micro-milling of aluminium alloy7050-T7451 (EI CONFERENCE) 会议论文 OAI收割
10th Asia-Pacific Conference on Materials Processing, APCMP 2012, June 14, 2012 - June 17, 2012, Jinan, China
作者: Li J.; Li J.; Li J.; Zhou J.; Wang F.

收藏 | 浏览/下载：29/0 | 提交时间：2013/03/25

The mechanism of micro-milling modeling for aluminum alloy 7050-T745 is to be investigated and a finite element model for micro-milling that reflects the actual state of the three-dimensional micro-milling is built by adopting the software of ABAQUS/Explicit. Experiment is conducted to verify the validation of the model. Simulated chip morphology in different cutting parameters agrees to the experimental results very well. Based on the FE model cutting stresses equivalent plastic strains temperatures distribution and cutting forces are obtained and analyzed. This provides a good method to investigate the micro milling principles. (2012) Trans Tech Publications.

Study on the azimuth bearing scheme of a large Alt-azimuth telescope (EI CONFERENCE) 会议论文 OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, April 26, 2010 - April 29, 2010, Dalian, China
作者: Wang H.; Dai S.; Zhang J.; Wang H.; Zhang J.

收藏 | 浏览/下载：39/0 | 提交时间：2013/03/25

The azimuth bearing schemes in typical large Alt-azimuth telescopes especially the 3.5-m APO telescope and the 4.1-m SOAR telescope were analyzed. A scheme of high-angular contacted thrust ball bearing integrated with a radial ball bearing was put forward. According to the Hertz contact theory the corresponding parameters were designed for engineering application. The static performance parameters within the range of 60 85 original contact angle were calculated. Compared with the traditional plane thrust ball bearing the results shows that the high-angular (80) contact thrust ball bearing has more benefits at bearing strength and rigidity for large telescope. The 1500mm diameter prototyping bearing shows good performance including the axial jitter is 0.009mm the radial jitter is 0.006mm the maximum starting torque without load is 30N·m and the load capacity is more than 30t which offers advanced technique path for the buildup of the high precision azimuth shafting and the whole telescope system. 2010 Copyright SPIE - The International Society for Optical Engineering.

Corrosion protection of AZ91D magnesium alloy with sol-gel coating containing 2-methyl piperidine 期刊论文 OAI收割
Progress in Organic Coatings, 2009, 卷号: 66, 期号: 3, 页码: 183-191
H. W. Shi; F. C. Liu; E. H. Han

收藏 | 浏览/下载：13/0 | 提交时间：2012/04/13

Sol-gel coatings Magnesium alloy Inhibitor Corrosion parameters resistance inhibitors aa2024-t3 films

Super-resolved imaging system with oversampling technology (EI CONFERENCE) 会议论文 OAI收割
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies, AOMATT 2007: Advanced Optical Manufacturing Technologies, July 8, 2007 - July 12, 2007, Chengdu, China
作者: Zhang X.; Wang L.-J.; Wang L.-J.; Zhang J.-P.; Liu Y.

收藏 | 浏览/下载：62/0 | 提交时间：2013/03/25

It has been a significant issue in the imaging filed to provide the highest possible resolution of an electro-optical imaging system(E-O imaging system). CCD arrays are inherently undersampled and spatial frequency above Nyquist frequency is distorted so as to create ambiguity and Moire patterns for targets imaged by E-O system.. As to this drawback a system-design project is introduced and discussed in the paper. It's well known that many image quality metrics are linked to MTF. However CCDs don't satisfy MTF condition namely the shift-invariant property so MTF synthesis can't appraise the whole system simply by the MTF product of the few sub-system ones in E-O imaging system. Then it is depicted how to solve this problem in the following. Finally the analyses and comparisons of the imaging performance parameters with and without super-resolved technologies are shown.