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构建以学为中心的数学学习基本原理——兼评孔凡哲教授著作《数学学习心理学(第三版)》

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教育理论与实践 2021年第35期41卷 63-64页

作者：孙志军山东省济宁市明珠小学山东济宁272008

数学学习心理学是研究学生数学学习规律的一门科学,是心理学与数学科学的交叉学科,与数学课程论、数学教学论共同构成数学教育的理论基础。理论研究的目的是形成完整的理论体系,最终是为了培养学生的学习能力,提升学生素养,促进学生可... 详细信息

数学学习心理学是研究学生数学学习规律的一门科学,是心理学与数学科学的交叉学科,与数学课程论、数学教学论共同构成数学教育的理论基础。理论研究的目的是形成完整的理论体系,最终是为了培养学生的学习能力,提升学生素养,促进学生可持续发展。心理科学与数学科学的完美融合,构建了数学学习基本理论;理论和实践相结合,用数学理论展示数学的性格;构建了数学课程论、数学教学论的基础理论;诠释了学生发展数学核心素养的关键能力及其培养。

关键词：数学学习以学为中心心理学认知学习规律数学性格

A Fluorine-Functionalized 3D Covalent Organic Framework with Entangled 2D Layers

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Chinese Journal of Polymer Science 2024年第8期42卷 1210-1216页

作者： Li-Bang Xiao Zi-Han Wu jun-Jie Xin Yuan-Peng Cheng Bo Gui jun-Liang sun Cheng Wang College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072China College of Chemistry and Molecular Engineering Beijing National Laboratory for Molecular SciencesPeking UniversityBeijing 100871China

Constructing three dimensional(3D)covalent organic frameworks(COFs)through the entanglement of two dimensional(2D)nets is a promising but underdeveloped ***,we report the design and synthesis of a fluorine functionalized 3DCOF(3D-An-COF-F)formed by entangled 2D sql *** structure of 3D-An-COF-F was determined by the combination of continuous rotation electron diffraction technique and modelling based on the chemical information from real ***,compared to the isostructural 3D-An-COF without F atom s,3DAn-COF-F showed an improved CO_(2)sorption ability and higher CO_(2)/N_(2)*** study not only demonstrated the generality of constructing 3D COFs with entangled 2D nets by introducing bulky groups vertically in planar building blocks,but also will expand the diversity of 3D COFs for various applications.

关键词： 3D covalent organic frameworks Fluorine Entangled 2D layers Electron diffraction CO_(2)adsorption

Phase behavior of gas condensate in porous media using real-time computed tomography scanning

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Petroleum Science 2024年第2期21卷 1032-1043页

作者： Wen-Long Jing Lei Zhang Ai-Fen Li jun-Jie Zhong Hai sun Yong-Fei Yang Yu-Long Cheng jun Yao Institute of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina National Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao266580ShandongChina

The phase behavior of gas condensate in reservoir formations differs from that in pressure-volume-temperature(PVT)cells because it is influenced by porous media in the reservoir *** was used as a sample to investigate the influence of porous media on the phase behavior of the gas *** pore structure was first analyzed using computed tomography(CT)scanning,digital core technology,and a pore network *** sandstone core sample was then saturated with gas condensate for the pressure depletion *** each pressure-depletion state was stable,realtime CT scanning was performed on the *** scanning results of the sample were reconstructed into three-dimensional grayscale images,and the gas condensate and condensate liquid were segmented based on gray value discrepancy to dynamically characterize the phase behavior of the gas condensate in porous *** network models of the condensate liquid ganglia under different pressures were built to calculate the characteristic parameters,including the average radius,coordination number,and tortuosity,and to analyze the changing mechanism caused by the phase behavior change of the gas *** types of condensate liquid(clustered,branched,membranous,and droplet ganglia)were then classified by shape factor and Euler number to investigate their morphological changes dynamically and *** results show that the dew point pressure of the gas condensate in porous media is 12.7 MPa,which is 0.7 MPa higher than 12.0 MPa in PVT *** average radius,volume,and coordination number of the condensate liquid ganglia increased when the system pressure was between the dew point pressure(12.7 MPa)and the pressure for the maximum liquid dropout,Pmax(10.0 MPa),and decreased when it was below *** volume proportion of clustered ganglia was the highest,followed by branched,membranous,and droplet *** study provides crucial experimental evidence for the phase behavior chan

关键词： Gas condensate Pressure depletion Real-time micro-computed tomography scanning Distribution of condensate liquid

文化产业集聚的空间溢出效应与收敛形态实证研究

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中国软科学 2015年第8期 173-183页

作者：孙智君李响武汉大学经济与管理学院湖北武汉430072

集聚对于提升文化产业的空间溢出效应,实现各区域文化产业协同发展具有重要意义。本文构建以文化产业集聚水平为被解释变量,以城市化经济水平和地方化经济水平为解释变量的分析框架,运用普通面板模型、单区制空间面板模型和两区制空间... 详细信息

集聚对于提升文化产业的空间溢出效应,实现各区域文化产业协同发展具有重要意义。本文构建以文化产业集聚水平为被解释变量,以城市化经济水平和地方化经济水平为解释变量的分析框架,运用普通面板模型、单区制空间面板模型和两区制空间面板模型,探究文化产业空间溢出效应及其作用机制,并进行收敛性分析。研究表明:(1)全国和东部地区存在着显著的正向空间溢出效应,中部地区存在着负向空间溢出效应,西部地区溢出效应不显著;(2)沿海地区文化产业集聚的溢出效应大于内陆地区,产业集聚程度高的区域对产业集聚程度低的区域的梯度空间溢出效应以扩散效应为主;(3)产业集聚的区域差异存在β收敛趋势,且不存在σ和俱乐部收敛,文化产业空间溢出效应有助于实现区域之间文化产业的协同发展,不是恶性累积循环的发展趋势。

关键词：文化产业收敛空间溢出效应产业集聚

Elastic reverse-time migration in irregular tunnel environment based on polar coordinates

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Applied Geophysics 2020年第2期17卷 253-266,316页

作者： Qu Ying-Ming Zhou Chang Worral Qurmet Li Zhen-Chun Wang Chang-Bo sun jun-zhi Department of Geophysics School of GeosciencesChina University of Petroleum(East China)Qingdao 266580China Geophysical Research Institute Shengli Oilfi eld Branch Co.SINOPECDongying 257022China

When seismic exploration is conducted in a special geological environment such as a tunnel space,the traditional imaging method in the Cartesian coordinate system cannot accurately discretize the air column in that ***,obtaining Thus,obtaining highquality imaging results is diffi ***,an elastic-wave reverse-time migration method based on the polar coordinate system is *** this method,three boundary conditions exist:outer,inner,and corner *** the outer boundary,the polar-coordinated absorbing boundary in the radial direction is used to suppress the artifi cial-boundary refl *** free-surface boundary condition is adopted in the tunnel space at the inner *** the angular boundaries,we use two diff erent boundary conditions for two *** air column in the tunnel space is usually not an irregular ***,the irregular tunnelspace geological body in the polar coordinate system is meshed into curvilinear grids and transformed into a regular one in an auxiliary polar coordinate system using the mapping ***,elastic reverse-time migration technology is applied into the auxiliary polar coordinate *** the numerical examples,two typical models are used to test the proposed method,which verify that the proposed method can obtain accurate images from the datasets in the tunnel space.

关键词： Polar coordinate system Irregular tunnel Elastic Reverse-time migration Free surface

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习近平新时代经济高质量发展思想及其价值

上海经济研究 2019年第10期31卷 25-35页

作者：孙智君陈敏武汉大学经济思想史研究所/武汉大学经济与管理学院

习近平总书记在党的十九大报告中对当前中国经济做出重大战略判断,指出:"我国经济已由高速增长阶段转向高质量发展阶段"。习近平经济高质量发展思想的内涵十分丰富,其核心理念是创新、协调、绿色、开放与共享,其发展路径是供给侧结构性... 详细信息

习近平总书记在党的十九大报告中对当前中国经济做出重大战略判断,指出:"我国经济已由高速增长阶段转向高质量发展阶段"。习近平经济高质量发展思想的内涵十分丰富,其核心理念是创新、协调、绿色、开放与共享,其发展路径是供给侧结构性改革,其战略目标是建设现代经济体系。习近平总书记立足于当前中国宏观、中观和微观经济层面的新矛盾和新问题,以马克思主义政治经济学为指导,以问题导向和实践指向为原则,从宏观、中观和微观三个层面展开对中国经济改革实践的总结和提炼,从而形成系统的、重要的理论结晶,进而指导中国特色社会主义经济实践。习近平经济高质量发展思想是习近平新时代中国特色社会主义思想的重要组成部分,具有重要的理论价值、实践价值和政策价值。

关键词：习近平经济高质量发展思想价值现代经济体系供给侧结构性改革

The superiority of nonconjugated structures in fluorescence:through-space ***-bond charge transfer

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Science China Chemistry 2024年第9期67卷 3121-3130页

作者： Weihao Tu Zuping Xiong Lei Wang Jianyu Zhang Jing zhi sun Haoke Zhang Ben Zhong Tang MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310058China Zhejiang-Israel Joint Laboratory of Self-Assembling Functional Materials ZJU-Hangzhou Global Scientific and Technological Innovation CenterZhejiang UniversityHangzhou 311215China Centre of Healthcare Materials Shaoxing InstituteZhejiang UniversityShaoxing 312000China Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionThe Hong Kong University of Science and TechnologyHong Kong 999077China School of Science and Engineering Shenzhen Institute of Aggregate Science and TechnologyThe Chinese University of Hong KongShenzhen(CUHK-Shenzhen)Guangzhou 518172China

Constructing charge transfer(CT)state by introducing donor(D)and acceptor(A)is an efficient strategy to regulate the photophysical properties of luminescent *** CT-type luminophores are built onπ-conjugated fused-ring structures,which always show hybrid CT/locally excited(LE)states and luminescence quenching effect in the aggregate *** this work,eight conjugated biphenyl(BP)and nonconjugated diphenylmethane(DPM)derivatives with different donors and acceptors are synthesized to investigate the CT *** photophysical characterization and theoretical calculation demonstrate that the through-space CT(TSCT)in nonconjugated DA-DPM exhibit superior photophysical performance than the conjugated DA-BP with through-bond CT(TBCT),the main manifestations are as follows:(1)TSCT luminophores produce longer maximum emission wavelength(λ_(em))than the corresponding TBCT *** example,the longest λ_(em)of DMA-CN-DPM(DMA,dimethylamino)is 621 nm but the corresponding λ_(em)of DMA-CN-BP is only 480 nm.(2)TSCT-based DA-DPM demonstrates more sensitive responsiveness to environmental stimuli such as temperature and polarity.(3)Complete separation of the the highest occupied molecular orbital(HOMO)and the lowest unoccupied molecular orbital(LUMO)distribution exists in all kinds of conformation of DA-DPM,which was hard to realize in conjugated DA-BP.

关键词： through-space charge transfer through-space conjugation clusteroluminescence diphenylmethane

Efficient removal of tetracycline hydrochloride through novel Fe/BiOBr/Bi_(2)WO_(6) photocatalyst prepared by dual-strategy under visible-light irradiation

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Journal of Environmental Sciences 2024年第4期138卷 46-61页

作者： Guanlong Yu Kai Yang Yi Yang Yifu Li Qifang sun Peiyuan Li Wenming Wang Fengming Song Tao Ling Xuejun Peng zhi Yu Shiquan sun School of Hydraulic and Environmental Engineering Changsha University of Science&TechnologyChangsha 410114China Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province Changsha 410114China Hunan Pilot Yanghu Reclaimed Water Co. Ltd.Changsha 410208China China Railway Wuju Group the First Engineering Co. Ltd.Changsha 410117China

It is important to investigate whether combining two modification strategies has a synergistic effect on the activity of *** this manuscript,Fe-doped BiOBr/Bi_(2)WO_(6) heterojunctions were synthesized by a one-pot solvothermal method,and excellent photocatalytic performance was obtained for the degradation of tetracycline hydrochloride(TCH)in water without the addition of *** experiments and characterization,the synergistic effect between Fe ion doping and the BiOBr/Bi_(2)WO_(6) heterojunction was *** Fe/BiOBr/Bi_(2)WO_(6) composite photocatalyst had a beneficial void structure,enhanced visible light response,and could inhibit the recombination of photogenerated support well,which improved the photocatalytic *** presented experiments demonstrate that Fe/BiOBr/Bi_(2)WO_(6) removes 97% of TCH from aqueous solution,while pure BiOBr and Bi_(2)WO_(6) only remove 56% and 65% of TCH,***,the separation and transfer mechanisms of photoexcited carriers were determined in conjunction with the experimental *** study provides a new direction for the design of efficient photocatalysts through the use of a dual co-modification strategy.

关键词： BiOBr/Bi_(2)WO_(6) Fe-doping Dual strategy Tetracycline hydrochloride Photodegradation

Relative difficulty distillation for semantic segmentation

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Science China(Information Sciences) 2024年第09期67卷 126-145页

作者： Dong LIANG Yue sun Yun DU Songcan CHEN Sheng-jun HUANG MIIT Key Laboratory of Pattern Analysis and Machine Intelligence College of Computer Science and Technology Nanjing University of Aeronautics and Astronautics Shenzhen Research Institute Nanjing University of Aeronautics and Astronautics

Current knowledge distillation(KD) methods primarily focus on transferring various structured knowledge and designing corresponding optimization goals to encourage the student network to imitate the output of the teacher network. However, introducing too many additional optimization objectives may lead to unstable training, such as gradient conflicts. Moreover, these methods ignored the guidelines of relative learning difficulty between the teacher and student networks. Inspired by human cognitive science, in this paper, we redefine knowledge from a new perspective — the student and teacher networks' relative difficulty of samples, and propose a pixel-level KD paradigm for semantic segmentation named relative difficulty distillation(RDD). We propose a two-stage RDD framework: teacher-full evaluated RDD(TFE-RDD) and teacher-student evaluated RDD(TSE-RDD). RDD allows the teacher network to provide effective guidance on learning focus without additional optimization goals, thus avoiding adjusting learning weights for multiple losses. Extensive experimental evaluations using a general distillation loss function on popular datasets such as Cityscapes, Cam Vid, Pascal VOC, and ADE20k demonstrate the effectiveness of RDD against state-ofthe-art KD methods. Additionally, our research showcases that RDD can integrate with existing KD methods to improve their upper performance bound. Codes are available at https://***/sunyueue/***.

关键词： knowledge distillation semantic segmentation relative difficulty sample weighting prediction discrepancy