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On Fridman Invariants and Generalized Squeezing Functions

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Chinese Annals of Mathematics,Series B 2022年第2期43卷 161-174页

作者： Feng RONG shichao yang School of Mathematical Sciences Shanghai Jiao Tong UniversityShanghai 200240China Corresponding author.School of Mathematics and Statistics Huizhou UniversityHuizhou 516007GuangdongChina

In this paper,the authors introduce the notion of generalized squeezing function and study the basic properties of generalized squeezing functions and Fridman *** also study the comparison of these two invariants,in t... 详细信息

关键词： Fridman invariant Squeezing function Quotient invariant

Bright compact ultrabroadband source by orthogonal laser-sustained plasma

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Light(Science & Applications) 2024年第11期13卷 2756-2766页

作者： Zhaojiang Shi shichao yang He Hu Haodong Lei Zhaohua yang Xia Yu School of Instrumentation and Optoelectronic Engineering Beihang UniversityBeijing 100191China

Laser-sustained plasma(LSP)source featuring high brightness and broadband spectral coverage is found to be powerful in various fields of scientific and industrial ***,the fundamental limit of low conversion efficiency constrains the system compactness and widespread applications of such broadband light *** this paper,we propose an innovative orthogonal LSP to break through the conversion efficiency *** by the elevated conversion efficiency from absorbed laser power to ultraviolet(UV)emission,a compact broadband source(250–1650 nm)with UV spectral radiance exceeding 210 mW=emm2·sr·nmT is achieved with>100W pump *** the plot of a two-dimensional refractive index model,we report an important conceptual advance that the orthogonal design eliminates the influence of the negative lensing effect on laser power *** results unambiguously demonstrate that we achieve a bright compact UV-VIS-NIR source with negligible thermal loss and the highest conversion efficiency to our *** enhancement of 4 dB contrast-to-noise ratio(CNR)in spectral single-pixel imaging has been demonstrated using the proposed ultrabroadband *** establishing the quantitative link between pumping optics design and plasma absorption,this work presents a compact broadband source that combines superior conversion efficiency and unprecedented brightness,which is essential to high-speed inspection and spectroscopy applications.

关键词： source orthogonal sustained

Nematode Community Structure and Diversity Pattern in Sandy Beaches of Qingdao,China

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维普期刊数据库

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Journal of Ocean University of China 2016年第1期15卷 33-40页

作者： HUA Er MU Fanghong ZHANG Zhinan yang shichao ZHANG Ting LI Jia College of Marine Life Sciences Ocean University of China

We investigated the diversity and structure of free-living marine nematode communities at three sandy beaches representing typical intertidal environments of a temperate zone in Qingdao,Shandong Province,*** nematode abundance ranged from 1006 to 2170 ind.10 cm-2,and a total of 34 nematode genera were recorded,of which only 8 were common in all the studied ***'s evenness and Shannon-Wiener diversity index were the lowest at the second beach where nematode abundance was the *** highest species diversity index coincided with the lowest nematode abundance at Shilaoren *** median grain size,sorting coefficient,and chlorophyll-a content were essential for differentiation in nematode abundance and species diversity,whereas taxonomic diversity of nematode was homogeneous across the three *** 0–20 cm sediment profile,nematode abundance declined abruptly with depth,whereas nematode diversity changed gently with obvious difference in 16–20 cm *** granulometry and chlorophyll-a content were the two foremost factors which influenced the vertical distribution pattern of nematode generic ***-selective deposit feeders constituted the most dominant trophic group,followed by epistratum ***(family:Tripyloididae) dominated at the second and yangkou beach,while Theristus(family:Xyalidae) prevailed at Shilaoren *** and predators became important at Shilaoren beach because of the high proportion of *** though,nematode community of the studied beaches did not differ significantly from each other.

关键词： vertical distribution biodiversity taxonomic diversity index trophic structure

Singapore's Economic Diplomacy

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China International Studies 2012年第6期32卷 112-125页

作者： yang shichao Department of International Organizations and Conferences at Chinese Foreign Ministry

Singapore,a small country in Southeast Asia,has made the most of its advantages since independence to pursue economic diplomacy through a variety of *** has not only achieved rapid economic growth and great improvemen... 详细信息

关键词：新加坡经济国家安全东南亚

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投资者的交易频率与市场质量

系统工程理论与实践 2021年第9期41卷 2271-2283页

作者：杨世超刘善存张强北京航空航天大学经济管理学院北京100191 北京化工大学经济管理学院北京100029

基于贝叶斯信念更新,构建了一个理性预期均衡模型,探讨交易频率对市场质量的影响,并且在模型中引入跟随者,探究知情交易者与跟随者之间的策略交互.结论显示跟随者总是会采取和知情交易者同向的交易策略,并且数值模拟发现过高的交易频率... 详细信息

基于贝叶斯信念更新,构建了一个理性预期均衡模型,探讨交易频率对市场质量的影响,并且在模型中引入跟随者,探究知情交易者与跟随者之间的策略交互.结论显示跟随者总是会采取和知情交易者同向的交易策略,并且数值模拟发现过高的交易频率会减少知情交易者和跟随者的交易强度,同时会增加两类投资者的期望收益.此外,过高的交易频率在增加市场价格的信息含量的同时,会减少市场的流动性,甚至会导致流动性崩溃.

关键词：交易频率市场微观结构理性预期跟随者贝叶斯均衡

High-speed three-dimensional shape measurement with inner shifting-phase fringe projection profilometry

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Chinese Optics Letters 2022年第11期20卷 78-84页

作者： shichao yang Hanlin Huang Gaoxu Wu Yanxue Wu Tian yang Fei Liu State Key Laboratory of Mechanical Transmission Chongqing UniversityChongqing 400044China College of Mechanical Engineering Chongqing UniversityChongqing 400044China

Fringe projection profilometry(FPP)has been extensively studied in the field of three-dimensional(3D)*** FPP always uses high-frequency fringes to ensure high measurement accuracy,too many patterns are projected to unwrap the phase,which affects the speed of 3D *** propose a high-speed 3D shape measurement method using only three high-frequency inner shifting-phase patterns(70 periods),which satisfies both high precision and high measuring speed ***,our proposed method obtains the wrapped phase and the fringe order simultaneously without any other information and *** proposed method has successfully reconstructed moving objects with high speed at the camera's full frame rate(1700 frames per second).

关键词： fringe projection profilometry high-speed 3D measurement inner shifting-phase dynamic object measurement

Advancements and Challenges in Organic–Inorganic Composite Solid Electrolytes for All‑Solid‑State Lithium Batteries

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Nano-Micro Letters 2025年第1期17卷 46-97页

作者： Xueyan Zhang shichao Cheng Chuankai Fu Geping Yin Liguang Wang Yongmin Wu Hua Huo State Key Laboratory of Space Power‑Sources School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001People’s Republic of China College of Chemical and Biological Engineering Zhejiang UniversityHangzhou 310058People’s Republic of China State Key Laboratory of Space Power-Sources 2965 Dongchuan RoadMinhang DistrictShanghai 200240People’s Republic of China

To address the limitations of contemporary lithium-ion batteries,particularly their low energy density and safety concerns,all-solid-state lithium batteries equipped with solid-state electrolytes have been identified as an up-and-coming *** the various SEs,organic–inorganic composite solid electrolytes(OICSEs)that combine the advantages of both polymer and inorganic materials demonstrate promising potential for large-scale ***,OICSEs still face many challenges in practical applications,such as low ionic conductivity and poor interfacial stability,which severely limit their *** review provides a comprehensive overview of recent research advancements in ***,the influence of inorganic fillers on the main functional parameters of OICSEs,including ionic conductivity,Li+transfer number,mechanical strength,electrochemical stability,electronic conductivity,and thermal stability are systematically *** lithium-ion conduction mechanism of OICSE is thoroughly analyzed and concluded from the microscopic ***,the classic inorganic filler types,including both inert and active fillers,are categorized with special emphasis on the relationship between inorganic filler structure design and the electrochemical performance of ***,the advanced characterization techniques relevant to OICSEs are summarized,and the challenges and perspectives on the future development of OICSEs are also highlighted for constructing superior ASSLBs.

关键词： Composite solid electrolytes Inorganic filler Interfacial stability Li-ion conduction mechanism Characterization techniques

贵州民国档案中所见“疑似石漠化”与今日石漠化分布状况的比较研究

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中国历史地理论丛 2011年第1期26卷 32-40页

作者：韩昭庆杨士超复旦大学历史地理研究中心上海200433

通过对贵州省民国时期档案与相关资料的分析,依据各县"不能生产之石山"占该县总面积的百分比,把相关39县划分为四个程度不同的"疑似石漠化"地区:重度石漠化地区(≥50%)、中度石漠化地区(<50%≥20%)、轻度石漠化地区(<20%≥5%)和无明显... 详细信息

通过对贵州省民国时期档案与相关资料的分析,依据各县"不能生产之石山"占该县总面积的百分比,把相关39县划分为四个程度不同的"疑似石漠化"地区:重度石漠化地区(≥50%)、中度石漠化地区(<50%≥20%)、轻度石漠化地区(<20%≥5%)和无明显石漠化地区(<5%)。民国时期,毕节地区东部、安顺市、黔西南地区、铜仁及其周边地区的石漠化现象最为严重,除了铜仁及其周边地区,其他地区的石漠化状况与今日的吻合。民国时期石漠化严重程度与人口密度分布呈正相关,反映人类活动是石漠化扩张的主要原因。民国时期石漠化严重地区与碳酸盐岩的分布高度吻合,反映了石漠化的自然成因。

关键词：贵州民国时期石漠化分布石漠化成因

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与庄共舞对证券市场的影响分析

系统工程学报 2019年第3期34卷 346-356页

作者：杨世超刘善存张强北京航空航天大学经济管理学院北京100191 北京化工大学经济管理学院北京100029

针对庄家内幕交易的偏好,从交易动机上加以规避,同时基于贝叶斯信念更新,构建了一个理性预期均衡模型,探讨与庄共舞的逻辑机理及其对市场质量的影响,并且引入信息获取成本,分析信息市场均衡.结论显示价格的信息含量与庄家订单中的噪声... 详细信息

针对庄家内幕交易的偏好,从交易动机上加以规避,同时基于贝叶斯信念更新,构建了一个理性预期均衡模型,探讨与庄共舞的逻辑机理及其对市场质量的影响,并且引入信息获取成本,分析信息市场均衡.结论显示价格的信息含量与庄家订单中的噪声负相关,资本成本与庄家的意愿订单和其订单中的噪声负相关,信息市场存在内点均衡和角点均衡两种状态.此外给出了庄家参与交易和市场中存在与庄共舞现象的充分条件.

关键词：理性预期多重均衡庄家与庄共舞