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Preload relaxation analysis and reliable life prediction of space connection and separation device based on accelerated degradation tests
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作者 Gen LIU Qiong WU +2 位作者 Zhihua WANG Yixin LUO Yufeng QI 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2023年第3期202-211,共10页
The safety and reliability of space connection and separation device has become a key issue due to the increasing service span of deep space exploration mission.The long-term preload relaxation(a key failure mode)of c... The safety and reliability of space connection and separation device has become a key issue due to the increasing service span of deep space exploration mission.The long-term preload relaxation(a key failure mode)of connection and separation devices is focused in this paper.A series of tests have been designed and implemented to investigate the preload relaxation regulation and a comprehensive method has been constructed to analyze and predict the reliable lifetime of the device.The two-stage preload relaxation law of the device is found and reasonably considered.Due to the different relaxation mechanism,the first-stage preload relaxation is assessed based on the working-condition test results,and the second-stage preload relaxation is characterized by accelerated test results.Finally,the service reliability and reliable life are evaluated.The experiment and assessment results demonstrate the reasonability and effectiveness of the proposed method which can achieve long-service reliability analysis for space connection and separation device within limited time. 展开更多
关键词 Accelerated degradation tests Life prediction Preload relaxation Reliability-analysis space connection and separation device
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Acquiring multi-spectral images by digital still cameras based on XYZLMS interim connection space 被引量:1
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作者 张显斗 王强 +1 位作者 杨根福 王萌萌 《Chinese Optics Letters》 SCIE EI CAS CSCD 2014年第11期129-132,共4页
A method based on the XYZLMS interim connection space is proposed to accurately acquire the multi-spectral images by digital still cameras. The XYZLMS values are firstly predicted from RGB values by polynomial model w... A method based on the XYZLMS interim connection space is proposed to accurately acquire the multi-spectral images by digital still cameras. The XYZLMS values are firstly predicted from RGB values by polynomial model with local training samples and then spectral reflectance is constructed from XYZLMS values by pseudo-inverse method. An experiment is implemented for multi-spectral image acquisition based on a commercial digital still camera. The results indicate that multi-spectral images can be accurately acquired except the very dark colors. 展开更多
关键词 RGB Acquiring multi-spectral images by digital still cameras based on XYZLMS interim connection space LUT
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Effects of magnetic field on photon-induced quantum transport in a single dot-cavity system
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作者 Nzar Rauf Abdullah Aziz H Fatah Jabar M A Fatah 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第11期270-274,共5页
In this study,we show how a static magnetic field can control photon-induced electron transport through a quantum dot system coupled to a photon cavity.The quantum dot system is connected to two electron reservoirs an... In this study,we show how a static magnetic field can control photon-induced electron transport through a quantum dot system coupled to a photon cavity.The quantum dot system is connected to two electron reservoirs and exposed to an external perpendicular static magnetic field.The propagation of electrons through the system is thus influenced by the static magnetic and the dynamic photon fields.It is observed that the photon cavity forms photon replica states controlling electron transport in the system.If the photon field has more energy than the cyclotron energy,then the photon field is dominant in the electron transport.Consequently,the electron transport is enhanced due to activation of photon replica states.By contrast,the electron transport is suppressed in the system when the photon energy is smaller than the cyclotron energy. 展开更多
关键词 photon connected reservoirs zigzag suppressed perpendicular exposed spacing Hamiltonian confinement
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迈向第三代人工智能 被引量:171
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作者 张钹 朱军 苏航 《中国科学:信息科学》 CSCD 北大核心 2020年第9期1281-1302,共22页
人工智能(artificial intelligence, AI)自1956年诞生以来,在60多年的发展历史中,一直存在两个相互竞争的范式,即符号主义与连接主义(或称亚符号主义).二者虽然同时起步,但符号主义到20世纪80年代之前一直主导着AI的发展,而连接主义从2... 人工智能(artificial intelligence, AI)自1956年诞生以来,在60多年的发展历史中,一直存在两个相互竞争的范式,即符号主义与连接主义(或称亚符号主义).二者虽然同时起步,但符号主义到20世纪80年代之前一直主导着AI的发展,而连接主义从20世纪90年代才逐步发展起来,到21世纪初进入高潮,大有替代符号主义之势.今天看来,这两种范式只是从不同的侧面模拟人类的心智(或大脑),具有各自的片面性,依靠单个范式不可能触及人类真正的智能.需要建立新的可解释和鲁棒的AI理论与方法,发展安全、可信、可靠和可扩展的AI技术.为实现这个目标,需要将这两种范式结合起来,这是发展AI的必经之路.本文将阐述这一思想,为叙述方便,我们称符号主义为第一代AI,称连接主义为第二代AI,将要发展的AI称为第三代AI. 展开更多
关键词 人工智能 符号主义 连接主义 双空间模型 单空间模型 三空间模型
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The Morita Characterization of Projective Free Rings 被引量:1
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作者 陈焕良 《Journal of Mathematical Research and Exposition》 CSCD 2000年第1期23-26,共4页
In this paper, we investigate the investigate the Morita characterizaton of projective free rings,and show that projective free rings have Mortita invariant properties.
关键词 projective free ring endomorphism ring connected space.
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Structural Networks Constraints on Alteration and Mineralization Processes in the Jiaojia Gold Deposit, Jiaodong Peninsula, China 被引量:1
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作者 Huanlong Hu Shuangliang Liu +3 位作者 Hong-Rui Fan Kuifeng Yang Yabin Zuo Yachun Cai 《Journal of Earth Science》 SCIE CAS CSCD 2020年第3期500-513,共14页
Structural network studies could give appropriate opportunities to understanding structural/hydrothermal events,transportation of ore-forming fluids and water/rock interaction process.Four structural deformation/hydro... Structural network studies could give appropriate opportunities to understanding structural/hydrothermal events,transportation of ore-forming fluids and water/rock interaction process.Four structural deformation/hydrothermal events have been identified in the Jiaojia fault zone according to microtexture and deformation of quartz and feldspars.Plagioclase experienced ductile deformation period with bended polysynthetic twin stripes(>450℃)in the early stage,followed by K-feldspar alteration period with ductile-brittle deformation and subgrain rotation recrystallization of quartz(380-450℃).Then,sericitization period occurred extensive ductile-brittle deformation(350-420℃)and extensive subgrain rotation recrystallization with a little bulging recrystallization in quartz.In the last,gold precipitation-related pyrite-sericite-quartz alteration was dominated by brittle deformation(300-380℃)and total bulging recrystallization of quartz.From the K-feldspar alteration zone and sericitization zone to pyrite-sericitequartz alteration zone,fractal dimension values of dynamically recrystallized quartz grains increase from 1.07 and 1.24 to 1.32,the calculated paleo strain rate values of dynamically recrystallized quartz range from 10^-10^.7(380℃)-10^-9.6(450℃)and 10^-9.3(350℃)-10^-8.2(420℃)to 10^-9.5(300℃)-10^-8.0(380℃),and the paleo differential stress values increase from 36.9 and 39.3,to 121.3 MPa.The increase of fractal dimension values and decrease of grain size from pyrite-sericite-quartz alteration zone and sericitization zone to K-feldspar alteration zone decreased average water/rock ratio values,which could lead to different acidity and redox conditions of ore-forming fluids and mineralization differences.Two kinds of orecontrolling fractures have been distinguished which include the gentle dip types(18°-50°)with NW(315°-355°)and SW(180°-235°)dip hosting No.Ⅰorebodies and the steep dip types(74°-90°)with NE(45°-85°)and SE(95°-165°)dip hosting No.Ⅲorebodies.These faults/fractures crosscut altered Linglong granite of footwall of the Jiaojia fault zone as rhombohedrons that promoted the connection between fractures in the K-feldspar alteration zone and fluid flow passages near the main fault face.Research results indicate No.Ⅰand No.Ⅲorebodies should be derived from the same mineralization event and belong to different orebody types in different mineralization sites under the same structural networks. 展开更多
关键词 ore-controlling structural networks brittle-ductile deformation dynamic recrystallization of quartz fractal of quartz connection in the space Jiaojia Gold Deposit
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Transversality on locally pseudocompact groups
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作者 Fucai LIN Zhongbao TANG 《Frontiers of Mathematics in China》 SCIE CSCD 2021年第3期771-782,共12页
Two non-discrete Hausdorff group topologiesτandδon a group G are called transversal if the least upper boundτ⋁δofτandδis the discrete topology.In this paper,we discuss the existence of transversal group topologi... Two non-discrete Hausdorff group topologiesτandδon a group G are called transversal if the least upper boundτ⋁δofτandδis the discrete topology.In this paper,we discuss the existence of transversal group topologies on locally pseudocompact,locally precompact,or locally compact groups.We prove that each locally pseudocompact,connected topological group satisfies central subgroup paradigm,which gives an affirmative answer to a problem posed by Dikranjan,Tkachenko,and Yaschenko[Topology Appl.,2006,153:3338–3354].For a compact normal subgroup K of a locally compact totally disconnected group G,if G admits a transversal group topology,then G/K admits a transversal group topology,which gives a partial answer again to a problem posed by Dikranjan,Tkachenko,and Yaschenko in 2006.Moreover,we characterize some classes of locally compact groups that admit transversal group topologies. 展开更多
关键词 Transversal group topology locally pseudocompact group locally compact group locally precompact connected space central topological group
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