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Strong Anisotropic Order Parameters at All-Nitride Ferromagnet/Superconductor Interfaces

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Chinese Physics Letters 2024年第2期41卷 102-111页

作者： Qiao Jin Meng Yang Guozhu Song Nan Zhao Shengru Chen Haitao Hong Ting Cui Dongke Rong Qianying wang Yiyan Fan Chen Ge Can wang Jiachang Bi Yanwei Cao Liusuo Wu shanmin wang Kui-Juan Jin Zhi-Gang Cheng Er-Jia Guo Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China Department of Physics&Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Department of Physics Southern University of Science and TechnologyShenzhen 518055China Songshan Lake Materials Laboratory Dongguan 523808China Ningbo Institute of Materials Technology&Engineering Chinese Academy of SciencesNingbo 315201China

Proximity effects between superconductors and ferromagnets(SC/FM)hold paramount importance in comprehending the spin competition transpiring at their *** competition arises from the interplay between Cooper pairs and ferromagnetic exchange *** proximity effects between transition metal nitrides(TMNs)are scarcely investigated due to the formidable challenges of fabricating high-quality SC/FM *** fabricated heterostructures comprising SC titanium nitride(TiN)and FM iron nitride(Fe_(3)N)with precise chemical compositions and atomically well-defined *** magnetoresistance of Fe_(3)N/TiN heterostructures shows a distinct magnetic anisotropy and strongly depends on the external ***,the superconducting transition temperatureT_(C) and critical field of TiN experience notable suppression when proximity to Fe_(3)*** observe the intriguing competition of interfacial spin orientations near𝑇T_(C)(∼1.25 K).These findings not only add a new materials system for investigating the interplay between superconductor and ferromagnets,but also potentially provide a building block for future research endeavors and applications in the realms of superconducting spintronic devices.

关键词： proximity Superconductor titanium

基于气液两相地热源的ORC发电系统工质筛选

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动力工程学报 2024年第1期44卷 68-75页

作者：赵斌温柔边技超刘瑞龚宇烈王善民长沙理工大学能源与动力工程学院长沙410114 北京电力设备总厂有限公司北京102401 中国科学院广州能源研究所广州510640 西藏地热产业协会拉萨850000

针对以热源温度为140℃的气液两相混合地热流体为热源驱动的有机朗肯循环(ORC)发电系统最佳工质筛选问题,选取6种干工质,通过在MATLAB中搭建系统模型,分析了各工质蒸发温度对系统热力性能的影响,对比了不同蒸气质量分数下最佳蒸发温度... 详细信息

针对以热源温度为140℃的气液两相混合地热流体为热源驱动的有机朗肯循环(ORC)发电系统最佳工质筛选问题,选取6种干工质,通过在MATLAB中搭建系统模型,分析了各工质蒸发温度对系统热力性能的影响,对比了不同蒸气质量分数下最佳蒸发温度随热源温度的变化规律,并研究了热源质量流量对系统净输出功率的影响以及蒸发温度对回灌温度的影响。结果表明:综合考虑工质的热力性能、物理化学稳定性、热源匹配性以及回灌温度对地热ORC发电系统的影响,工质R601a(异戊烷)可作为以140℃气液两相混合地热流体为热源驱动的ORC发电系统的最佳适用工质。

关键词：地热电站有机朗肯循环性能分析有机工质筛选

Copper-Free Resin-Based Braking Materials:A New Approach for Substituting Copper with Fly-Ash Cenospheres in Composites

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Chinese Journal of Mechanical Engineering 2024年第2期37卷 401-412页

作者： Kaikui Zheng Youxi Lin shanmin You Zhiying Ren Jianmeng Huang School of Mechanical Engineering and Automation Fuzhou UniversityFuzhou 350108China National United Engineering Laboratory for Advanced Bearing Tribology Henan University of Science and TechnologyLuoyang 471023China

Copper particles emitted from braking have become a significant source of environmental ***,copper plays a crucial role in resin-based braking *** high-performance braking materials without copper has become a significant *** this paper,the resin-based braking materials were filled with flyash cenospheres to develop copper-free braking *** effects of fly-ash cenospheres on the physical properties,mechanical and friction and wear properties of braking materials were ***,the wear mechanism of copper-free resin-based braking materials filled with fly-ash cenospheres was *** results indicate that the inclusion of fly-ash cenospheres in the braking materials improved their thermal stability,hardness and impact strength,reduced their density,effectively increased the friction coefficient at medium and high temperatures,and enhanced the heat-fade resistance of the braking *** inclusion of fly-ash cenospheres contributed to the formation of surface friction film during the friction process of the braking materials,and facilitated the transition of form from abrasive wear to adhesive *** 100-350℃,the friction coefficient of the optimal formulation is in the range of 0.57-0.61,and the wear rate is in the range(0.29-0.65)×10^(-7) cm^(3)·N^(-1)·m^(-1),demonstrating excellent resistance to heat-fade and stability in friction *** research proposes the use of fly-ash cenospheres as a substitute for environmentally harmful and expensive copper in brake materials,which not only improves the performance of braking materials but also reduces their costs.

关键词： Fly-ash cenospheres Braking materials Friction and wear Heat-fade resistance Wear form

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类别平衡调制的人脸表情识别

计算机科学与探索 2023年第12期17卷 3029-3038页

作者：刘成广王善敏刘青山南京信息工程大学计算机学院南京210044 南京信息工程大学数字取证教育部工程研究中心南京210044 南京航空航天大学计算机科学与技术学院南京211106

人脸表情识别(FER)旨在从人脸图片中判断表情的类别,在心理诊断、人机交互等领域有着广泛的应用前景。在实际任务中,不同表情数据的分布往往是不平衡的。数据的不平衡导致了各表情的特征分布不平衡和分类器优化不平衡,从而影响了表情识... 详细信息

人脸表情识别(FER)旨在从人脸图片中判断表情的类别,在心理诊断、人机交互等领域有着广泛的应用前景。在实际任务中,不同表情数据的分布往往是不平衡的。数据的不平衡导致了各表情的特征分布不平衡和分类器优化不平衡,从而影响了表情识别模型的性能。为此,提出了一种类别平衡调制的人脸表情识别方法(CBM-Net),分别在特征学习阶段和分类器优化阶段对模型进行类别平衡调制。CBM-Net包括特征调制和梯度调制两个模块。特征调制模块通过在特征方向上增加类间的可分性与类内的紧密性,实现各类别的特征分布平衡。梯度调制模块利用批次训练样本的统计信息对各分类器的优化梯度进行反向调节,确保各类别的分类器收敛速度一致,使得各分类器性能同时达到最优。在四个流行的数据集上进行的定性和定量实验表明,CBM-Net在人脸表情识别的类别平衡调制上是有效的,与一众先进方法相比,效果也相当良好。

关键词：人脸表情识别(FER) 类别不平衡类别平衡调制特征调制梯度调制

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基于人脸部件掩膜的自监督三维人脸重建

计算机科学 2023年第2期50卷 214-220页

作者：朱磊王善敏刘青山南京信息工程大学数字取证教育部研究中心南京210044 南京航空航天大学计算机学院南京210016

三维人脸重建旨在从二维人脸图片中恢复出三维人脸模型。自监督三维人脸重建能够缓解三维人脸数据缺乏的问题,因此成为了近年来的研究热点。现有的自监督方法通常聚焦于使用全局监督信号,对人脸的局部细节关注不足。为了更好地恢复出细... 详细信息

三维人脸重建旨在从二维人脸图片中恢复出三维人脸模型。自监督三维人脸重建能够缓解三维人脸数据缺乏的问题,因此成为了近年来的研究热点。现有的自监督方法通常聚焦于使用全局监督信号,对人脸的局部细节关注不足。为了更好地恢复出细节生动的精细化三维人脸,提出了一种基于人脸部件掩膜的精细化三维人脸重建方法,该方法在不需要任何三维人脸标注的情况下,可以重建出精细化三维人脸。其主要思想是在二维图片一致性损失、图片深层感知损失等基本损失函数上,通过人脸部件掩膜,给予人脸区域精细化约束,并对人脸部件掩膜进行自监督约束,从而提高重建的三维人脸局部的准确性。在AFLW2000-3D和MICC Florence数据集上进行了定性以及定量实验,验证了所提方法的有效性和优越性。

关键词：三维人脸重建人脸对齐人脸建模自监督学习人脸渲染

内在的善与余数分配——“科恩难题”的伦理进路

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福建论坛（人文社会科学版） 2024年第4期 77-89页

作者：董山民中南大学人文学院

科恩在试图推广野营旅行遵循的共享和平等原则时遇到了困难,即无法为慷慨无私等美德找到组织机制和运用场景,我们可以称之为“科恩难题”。按照科恩理解的历史唯物主义,资本主义市场错误地激发并利用了贪婪、自私等恶劣的人性动机,导致... 详细信息

科恩在试图推广野营旅行遵循的共享和平等原则时遇到了困难,即无法为慷慨无私等美德找到组织机制和运用场景,我们可以称之为“科恩难题”。按照科恩理解的历史唯物主义,资本主义市场错误地激发并利用了贪婪、自私等恶劣的人性动机,导致人类片面地追求外在利益,忽视了实践活动内在的善。然而,人类活动自然承载的内在的善却被长期而普遍地遮蔽,社会主义的市场经济却特别依赖这种内在的善。实际上,劳动者创造出来的价值部分,在一定的条件下可以有效地转化为社会资产,从而推动余数分配和社会主义建设。

关键词： “科恩难题” 外在利益内在的善余数分配

The reformation of catalyst:From a trial-and-error synthesis to rational design

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Nano Research 2024年第4期17卷 3261-3301页

作者： Ligang wang Jiabin Wu Shunwu wang Huan Liu Yao wang Dingsheng wang Department of Chemistry Tsinghua UniversityBeijing 100084China

The appropriate catalysts can accelerate the reaction rate and effectively boost the efficient conversion of various molecules,which is of great importance in the study of chemistry,chemical industry,energy,materials and environmental ***,efficient,environmentally friendly,and easy to operate synthesis methods have been used to prepare various types of *** previous studies have reported the synthesis and characterization of the aforementioned catalysts,more still remain in trial and error methods,without in-depth consideration and improvement of traditional synthesis ***,we comprehensively summarize and compare the preparation methods of the trial-and-error synthesis strategy,structure–activity relationships and density functional theory(DFT)guided catalysts rational design for nanomaterials and atomically dispersed *** also discuss in detail the utilization of the nanomaterials and single atom catalysts for converting small molecules(H_(2)O,O_(2),CO_(2),N_(2),etc.)into value-added products driven by electrocatalysis,photocatalysis,and ***,the challenges and outlooks of mass preparation and production of efficient and green catalysts through conventional trial and error synthesis and DFT theory are featured in accordance with its current development.

关键词： trial-and-error synthesis structure–activity relationships density functional theory(DFT)guidance nanomaterials atomically dispersed catalysts

Numerical Analysis of PRISM-PY Calculations for Hard-and Soft-Core Generic Polymer Models

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Chinese Journal of Polymer Science 2024年第4期42卷 532-543页

作者： Qiang wang Department of Chemical and Biological Engineering Colorado State University1370 Campus DeliveryFort CollinsCO80523-1370USA

Generic polymer models capturing the chain connectivity and excluded-volume interactions between polymer segments can be classified, according to whether or not the 3D integral of the latter diverges, into hard- and soft-core models. Taking homogeneous systems of compressible homopolymer melts (or equivalently homopolymer solutions in an implicit, good solvent) in the continuum as an example, we recently compared the correlation effects on the structural and thermodynamic properties of the hard- and soft-core models given by the polymer reference interaction site model (PRISM) theory with the Percus-Yevick (PY) closure (Polymers 2023, 15, 1180). Here we analyzed in detail the numerical errors and behavior of the interchain pair correlation functions (PCFs) given by the PRISM-PY calculations of these models using an efficient numerical approach that we proposed. Our numerical approach has the least number of independent variables to be iteratively solved, analytically treats the discontinuities caused by the non-bonded pair potential (such as that of the hard spheres) and takes only the inverse Fourier transform of the interchain indirect PCF between polymer segments (which is continuous and decays towards 0 with increasing wavenumber much faster than both the interchain direct and total PCFs), and is essential for us to accurately solve the PRISM-PY theory for chain length N as large as 106. To capture the correlation-hole effect, the real-space cut-off in the PRISM calculations should be proportional to the square root of N.

关键词： Generic polymer models Soft potentials Polymer reference interaction site model theory

Linear-Quadratic Pareto Cooperative Game for Mean-Field Backward Stochastic System

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Journal of Systems Science & Complexity 2024年第3期37卷 947-964页

作者： wang Yu School of Control Science and Engineering Shandong UniversityJinan 250061China

This paper focuses on a Pareto cooperative differential game with a linear mean-field backward stochastic system and a quadratic form cost functional. Based on a weighted sum optimality method, the Pareto game is equivalently converted to an optimal control problem. In the first place,the feedback form of Pareto optimal strategy is derived by virtue of decoupling technology, which is represented by four Riccati equations, a mean-field forward stochastic differential equation(MF-FSDE),and a mean-field backward stochastic differential equation(MF-BSDE). In addition, the corresponding Pareto optimal solution is further obtained. Finally, the author solves a problem in mathematical finance to illustrate the application of the theoretical results.

关键词： Backward stochastic differential equation linear-quadratic control mean-field Pareto optimality