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Optimal constant in an L^2 extension problem and a proof of a conjecture of Ohsawa

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Science China Mathematics 2015年第1期58卷 35-59页

作者： guan qi'An ZHOU Xiang Yu Beijing International Center for Mathematical Research Peking University School of Mathematical Sciences Peking University Institute of Mathematics Academy of Mathematics and Systems ScienceChinese Academy of Sciences Hua Loo-Keng Key Laboratory of Mathematics Chinese Academy of Sciences

In this paper,we solve the optimal constant problem in the setting of Ohsawa’s generalized L2extension *** applications,we prove a conjecture of Ohsawa and the extended Suita conjecture,we also establish some relatio... 详细信息

关键词： L2 extension theorem optimal L2 estimate Bergman kernel a conjecture of Ohsawa extendedSuita conjecture

Shape-influenced non-reciprocal transport of magnetic skyrmions in nanoscale channel

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Chinese Physics B 2024年第7期33卷 605-611页

作者：陈杰尧罗佳胡更新王君林李冠祺陈振东陆显扬赵国平刘远吴竞徐永兵 School of Integrated Circuits Guangdong University of TechnologyGuangzhou 510006China School of Physics Engineering and TechnologyUniversity of YorkYork YO105DDUnited Kingdom College of Physics and Electronic Engineering Sichuan Normal UniversityChengdu 610068China Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials School of Electronic Science and EngineeringNanjing UniversityNanjing 210093China

Skyrmions, with their vortex-like structures and inherent topological protection, play a pivotal role in developing innovative low-power memory and logic devices. The efficient generation and control of skyrmions in geometrically confined systems are crucial for the development of skyrmion-based spintronic devices. In this study, we focus on investigating the non-reciprocal transport behavior of skyrmions and their interactions with boundaries of various shapes. The shape of the notch structure in the nanotrack significantly affects the dynamic behavior of magnetic skyrmions. Through micromagnetic simulation, the non-reciprocal transport properties of skyrmions in nanowires with different notch structures are investigated in this work.

关键词： skyrmion micromagnetic simulation racetrack memory

Stability of Multiplier Ideal Sheaves

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Chinese Annals of Mathematics,Series B 2022年第5期43卷 819-832页

作者： qi'an guan Zhenqian LI Xiangyu ZHOU School of Mathematical Sciences Peking UniversityBeijing 100871China Siwuge Technology Co.Ltd. Tianfu Life Science ParkChengdu 610093China Institute of Mathematics AMSSand Hua Loo-Keng Key Laboratory of MathematicsChinese Academy of SciencesBeijing100190China

In the present article, the authors find and establish stability of multiplier ideal sheaves, which is more general than strong openness.

关键词： Plurisubharmonic function Multiplier ideal sheaf Strong openness and stability Coherent analytic sheaf L^(2)estimate

“月也”作媒:三江侗族自治县晒江村民族交往交流交融研究——民族交往交流交融的实践研究系列之一

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青海民族大学学报（社会科学版） 2024年第1期50卷 65-72页

作者：罗彩娟关琦宇广西民族大学广西南宁530006

“月也”是在春节期间侗族村寨之间开展的社交习俗。从“月也”的历史与现状来看,它是一项集结盟、社交、婚姻与娱乐为一体的民俗活动,在长期历史发展中成为晒江村侗族与苗族的共享习俗,并承载了他们的集体记忆。晒江村的实践证明,“月... 详细信息

“月也”是在春节期间侗族村寨之间开展的社交习俗。从“月也”的历史与现状来看,它是一项集结盟、社交、婚姻与娱乐为一体的民俗活动,在长期历史发展中成为晒江村侗族与苗族的共享习俗,并承载了他们的集体记忆。晒江村的实践证明,“月也”是促进族际互动、增强文化认同的重要媒介。其民族交往交流交融的有效机制可概括为:互嵌式居住格局是推动民族交往的物质基础,社交习俗是促进民族交流的纽带,文化认同是增进民族交融的心理基础。鉴于此,应该充分挖掘、发挥集体性习俗的有利因素,让其成为促进民族交往交流交融的有益媒介。

关键词：月也民族交往交流交融民族关系

HRPose: Real-Time High-Resolution 6D Pose Estimation Network Using Knowledge Distillation

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Chinese Journal of Electronics 2023年第1期32卷 189-198页

作者： guan qi SHENG Zihao XUE Shibei Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai Engineering Research Center of Intelligent Control and Management

Real-time six degrees-of-freedom(6D)object pose estimation is essential for many real-world applications, such as robotic grasping and augmented reality. To achieve an accurate object pose estimation from RGB images in real-time, we propose an effective and lightweight model, namely high-resolution 6D pose estimation network(HRPose). We adopt the efficient and small HRNetV2-W18 as a feature extractor to reduce computational burdens while generating accurate 6D poses. With only 33% of the model size and lower computational costs, our HRPose achieves comparable performance compared with state-of-the-art models. Moreover, by transferring knowledge from a large model to our proposed HRPose through output and feature-similarity distillations, the performance of our HRPose is improved in effectiveness and efficiency. Numerical experiments on the widely-used benchmark LINEMOD demonstrate the superiority of our proposed HRPose against state-of-the-art methods.

关键词： Knowledge engineering Computational modeling Pose estimation Grasping Benchmark testing Feature extraction Real-time systems

Mineral Chemistry and Crystallization Conditions of the Late Cretaceous Mamba Pluton from the Eastern Gangdese, Southern Tibetan Plateau

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Journal of Earth Science 2016年第4期27卷 545-570页

作者： Xiaowei Li Xuanxue Mo Mark Scheltens qi guan State Key Laboratory of Geological Processes and Mineral Resources School of Earth Sciences and ResourcesChina University of Geosciences School of Earth and Space Sciences Peking University College of Resources Hebei GEO University

The Late Cretaceous Mamba granodiorite belongs to a part of the Mesozoic Gangdese continental magmatic belt. No quantitative mineralogical study has been made hitherto, and hence the depth at which it formed is poorly constrained. Here we present mineralogical data for the Mamba pluton, including host rocks and their mafic microgranular enclaves（MMEs）, to provide insights into their overall crystallization conditions and information about magma mixing. All amphiboles in the Mamba pluton are calcic, with ~B（Ca＋Na）〉1.5, and Si=6.81-7.42 apfu for the host rocks and Si=6.77-7.35 apfu for the MMEs. The paramount cation substitutions in amphibole include edenite type and tschermakite type. Biotites both in the host rocks and the MMEs collectively have high Mg O（13.19 wt.%-13.03 wt.%） contents, but define a narrow range of Al apfu（atoms per formula unit） variations（2.44-2.57）. The oxygen fugacity estimates are based on the biotite compositions cluster around the NNO buffer. The calculated pressure ranges from 1.2 to 2.1 kbar according to the aluminum-in-hornblende barometer. The computed pressure varies from 0.9 to 1.3 kbar based on the aluminum-in-biotite barometer which corresponds to an average depth of ca. 3.9 km. Besides, the estimates of crystallization pressures vary from 0.8 to 1.4 kbar based on the amphibole barometer proposed by Ridolfi et al.（2010）, which can be equivalent to the depths ranging from 3.1 to 5.2 km. The MMEs have plagioclase oscillatory zonings and quartz aggregates, probably indicating the presence of magma mixing. Besides, core-to-rim element variations（Rb, Sr, Ba, and P） for the K-feldspar megacrysts serve as robust evidence to support magma mixing and crystal fractionation. This indicates the significance of the magma mixing that contributes to the formation of K-feldspar megacryst zonings in the Mamba pluton.

关键词： Mamba pluton Gangdese terrane MMEs K-feldspar megacrysts magma mixing P-Tconditions oxygen fugacity in-situ trace element.

Thermal fatigue behavior of K465 superalloy

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Rare Metals 2006年第3期25卷 202-209页

作者： YANG Jinxia ZHENG qi SUN Xiaofeng guan Hengrong HU Zhuangqi Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

The thermal fatigue behavior of K465 superalloy was investigated at the peak temperature of 1050℃. By scanning electron microscopy （SEM） and optical microscopy, the main crack length was observed and measured. The initiation sites of the tested alloys are different in as-cast （named as K465） and solution heat treatment （named as SK465） conditions. In K465 alloy, most thermal fatigue cracks nucleate at （Nb,W,Ti）C carbides. In SK465 alloy, thermal fatigue cracks initiate in interdendritic regions, MC-type carbides and some interfaces. Thermal fatigue cracks propagate in transdendritic mode, and M6C-type carbides could retard thermal fatigue crack growth for SK465 superalloy.

关键词： K465 superalloy thermal fatigue crack initiation and growth carbides

High Photon-Number Squeezing in Strong Field Limit

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Communications in Theoretical Physics 2006年第5期45卷 929-931页

作者： qiAN Feng HUANG Hong-Bin qi guan-Xiao Department of Physics Southeast University Nanjing 210096 China

We show that high photon-number squeezing in bright light can be generated in both lasers and optical bistabilities by the injections of a squeezed vacuum and a classical field, and the high squeezing is maintained fo... 详细信息

关键词： photon number squeezing lasers and bistabilities

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滇西祥云地区早侏罗世地层发现恐龙新墓地

地质论评 2024年第2期70卷 759-768页

作者：胡绍斌刘军平曾文涛王伟夏彩香莫雄关奇云南省地质调查院昆明650216 中国地质大学地球科学与资源学院北京100083 自然资源部三江成矿作用及资源勘查利用重点实验室昆明650051

1938年,云南许氏禄丰龙的发现拉开了云南侏罗纪恐龙研究、发掘的序幕,恐龙化石的发现地从云南禄丰一带向外延展,陆续在云南晋宁、元谋姜驿、云南易门夕阳、武定万德、双柏安龙堡等地报道,但目前恐龙化石的报道均集中在楚雄盆地的中部及... 详细信息

1938年,云南许氏禄丰龙的发现拉开了云南侏罗纪恐龙研究、发掘的序幕,恐龙化石的发现地从云南禄丰一带向外延展,陆续在云南晋宁、元谋姜驿、云南易门夕阳、武定万德、双柏安龙堡等地报道,但目前恐龙化石的报道均集中在楚雄盆地的中部及东部,而楚雄盆地的西部地区未有报道。笔者等通过全面系统的古生物化石调查,在滇西祥云地区下侏罗统冯家河组首次发现恐龙骨胳化石产地,对该新化石产地开展初步化石剖面调查和修理,共发现有5层恐龙化石富集层,部分化石保存较为完整,未经过长距离搬运,以原地埋藏保存为主,骨胳化石主要有肠骨、椎体、坐骨及肱骨等。这一发现拓宽了云南恐龙化石的分布范围,填补了楚雄盆地西部无恐龙化石的空白,丰富了云南早侏罗世恐龙化石库,为楚雄盆地西部古环境演化及地层对比提供了重要的古生物化石研究素材。

关键词：早侏罗世冯家河组恐龙楚雄盆地滇西祥云地区