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Pressure Distinguishes the Dual Emissions in Pseudohalide 2D Ruddlesden-Popper Perovskite Cs_(2)Pb(SCN)_(2)Br_(2)

CCS Chemistry 2024年第7期6卷 1748-1756页

作者： Songhao Guo Yuhong Mao Congcong Chen Yao Zhang Guoxiang Zhao Kejun Bu Qingyang Hu Haiming Zhu Guifu Zou Wenge Yang Lingling Mao xujie Lü Center for High Pressure Science and Technology Advanced Research(HPSTAR) Shanghai Department of Chemistry Southern University of Science and TechnologyShenzhen Department of Chemistry Zhejiang UniversityHangzhou College of Energy Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSoochow UniversitySuzhou

Two-dimensional(2D)Ruddlesden-Popper(RP)halide perovskites with diverse structures and properties have drawn increasing attention due to their promising optoelectronic ***,a new all-inorganic Cs_(2)Pb(SCN)_(2)Br_(2) has been reported that opens up new potential for the development of 2D RP ***,recent reports of unusual dual emissions and two-edge absorption in Cs_(2)Pb(SCN)_(2)Br_(2) have generated intense debate about its origin and remains ***,by combining continuous pressure tuning with in situ diagnostics,we have unambiguously revealed the underlying mechanisms that the 2D Cs_(2)Pb(SCN)_(2)Br_(2) exhibits an intrinsic blue emission at 2.66 eV and an absorption edge close to the emission *** the gradually formed CsPbBr_(3) is responsible for the green emission at 2.33 eV with the absorption shoulder at 2.41 ***,by fitting the temperature-dependent intensity of the intrinsic blue emission,we have determined the corrected value of exciton binding energy for 2D Cs_(2)Pb(SCN)_(2)Br_(2) to be 90 ***,an emission enhancement of 2.5 times is achieved in Cs_(2)Pb(SCN)_(2)Br_(2) under a mild pressure within 0.8 GPa,caused by the pressuresuppressed exciton-phonon *** work not only elucidates the origin of the dual emissions and two-edge absorption in Cs_(2)Pb(SCN)_(2)Br_(2),but it also provides a potential means to regulate and optimize the optoelectronic properties of 2D perovskites.

关键词： two-dimensional perovskite dual emissions two-edge absorption high pressure in situ characterization enhanced photoluminescence

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Enhanced photocatalytic N_(2) fixation using KNbO3/Bi_(4)O_(5)Br_(2) type Ⅱ heterojunction

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Frontiers of Chemical Science and Engineering 2024年第6期18卷 85-97页

作者： Lin Yue Zhihao Zeng xujie Ren Shude Yuan Chuanqi Xia Xin Hu Leihong Zhao Lvchao Zhuang Yiming He Key Laboratory of the Ministry of Education for Advanced Catalysis Materials College of Chemistry and Materials ScienceZhejiang Normal UniversityJinhua 321004China Department of Materials Science and Engineering Zhejiang Normal UniversityJinhua 321004China

The fabrication of heterojunction catalysts is an effective strategy to enhance charge separation efficiency,thus boosting the performance of *** work presents the synthesis and investigation of a novel KNbO_(3)/Bi_(4)O_(5)Br_(2) heterostructure catalyst for photocatalytic N_(2)-to-NH_(3) conversion under light *** morphology analysis revealed KNbO_(3) microcubes embedded within Bi_(4)O_(5)Br_(2) nanosheets,the composite exhibited no significant improvement in specific surface area or optical property compared to Bi_(4)O_(5)Br_(2) due to the relatively wide band gap and low surface area of KNbO_(3).The main contribution lies in the enhanced separation efficiency of photogenerated electrons and ***,the band structure analysis suggests that KNbO_(3) and Bi_(4)O_(5)Br_(2) exhibit suitable band potentials to form a type II *** from the higher Fermi level of KNbO_(3) than Bi_(4)O_(5)Br_(2),the electron drift at the contact region thus occurs and leads to the formation of a built-in electric field with the direction from KNbO_(3) to Bi_(4)O_(5)Br_(2),accelerating electron migration and improving the operational efficiency of the ***,the KNbO_(3)/Bi_(4)O_(5)Br_(2) catalyst shows an increased photoactivity,achieving an NH_(3) generation rate 1.78 and 1.58 times those of KNbO_(3) and Bi_(4)O_(5)Br_(2),*** work may offer valuable insights for the design and synthesis of heterojunction composite photocatalysts.

关键词： KNbO_(3)/Bi_(4)O_(5)Br_(2) heterojunction photocatalytic N_(2)fixation charge separation

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Unveiling a novel metal-to-metal transition in LuH_(2):Critically challenging superconductivity claims in lutetium hydrides

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Matter and Radiation at Extremes 2024年第3期9卷 65-73页

作者： Dong Wang Ningning Wang Caoshun Zhang Chunsheng Xia Weicheng Guo Xia Yin Kejun Bu Takeshi Nakagawa Jianbo Zhang Federico Gorelli Philip Dalladay-Simpson Thomas Meier xujie Lü Liling Sun Jinguang Cheng Qiaoshi Zeng Yang Ding Ho-kwang Mao Center for High-Pressure Science and Technology Advanced Research Beijing 100094China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China Shanghai Key Laboratory of Material Frontiers Research in Extreme Environments(MFree) Shanghai Advanced Research in Physical Sciences(SHARPS)Shanghai 201203China

Following the recent report by Dasenbrock-Gammon et al.[Nature 615,244–250(2023)]of near-ambient superconductivity in nitrogendoped lutetium trihydride(LuH_(3-δ)N_(ε)),significant debate has emerged surrounding the composition and interpretation of the observed sharp resistance ***,we meticulously revisit these claims through comprehensive characterization and *** definitively identify the reported material as lutetium dihydride(LuH_(2)),resolving the ambiguity surrounding its *** similar conditions(270–295 K and 1–2 GPa),we replicate the reported sharp decrease in electrical resistance with a 30%success rate,aligning with the observations by Dasenbrock-Gammon et ***,our extensive investigations reveal this phenomenon to be a novel pressure-induced metal-to-metal transition intrinsic to LuH_(2),distinct from ***,nitrogen doping exerts minimal impact on this *** work not only elucidates the fundamental properties of LuH_(2)andLuH_(3),but also critically challenges the notion of superconductivity in these lutetium hydride *** findings pave the way for future research on lutetium hydride systems,while emphasizing the crucial importance of rigorous verification in claims of ambient-temperature superconductivity.

关键词： resistance hydride superconductivity

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An ensemble learning strategy for multi-source hydrogen embrittlement data by introducing missing information

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Materials Genome Engineering Advances 2024年第2期2卷 145-157页

作者： xujie Gong Ruichao Lei Ruize Sun Xue Jiang Yanjing Su Yu Yan Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijingChina Beijing Advanced Innovation Center for Materials Genome Engineering Collaborative Innovation Center of Steel TechnologyUniversity of Science and Technology BeijingBeijingChina

Accurately and quickly predicting hydrogen embrittlement performance is critical for the service of metal ***,due to multi-source heterogeneity,existing hydrogen embrittlement data are missing,making it impractical to train reliable machine learning *** this study,we proposed an ensemble learning training strategy for missing data based on the Adaboost *** method introduced a mask matrix with missing data and enabled each round of training to generate sub-datasets,considering missing value *** strategy first trained a subset of features based on the existing dataset and a selected method and continuously focused on the combination of features with the highest error for iterative training,where the mask matrix of the missing data was used as the input to fit the weights of each base learner using a neural *** with directly modeling on highly sparse data,the predictive ability of this strategy was significantly improved by approximately 20%.In addition,in the testing of new samples,the predicted mean absolute error of the new model was successfully reduced from 0.2 to *** strategy offers good adaptability to the hydrogen embrittlement sensitivity of different sizes and can avoid interference from feature importance caused by filling data.

关键词： ensemble learning hydrogen embrittlement machine learning missing data

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Influences of divalent ion substitution on the magnetic and dielectric properties of W-type barium ferrite

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Chinese Physics B 2024年第6期33卷 480-486页

作者：何诗悦刘若水刘煦婕叶先平王利晨沈保根 School of Rare Earths University of Science and Technology of ChinaHefei 230026China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341119China Ningbo Institute of Materials Technology&Engineering Chinese Academy of SciencesNingbo 315201China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Saturation magnetization,magneto-crystalline anisotropy field,and dielectric properties are closely related to microwave devices applied at different *** regulating the magnetic and dielectric properties of W-type barium ferrites,single-phase BaMe_(2)Fe_(16)O_(27)(Me=Fe,Mn,Zn,Ni,Co) with different Me ions were synthesized by the high-temperature solid-state *** saturation magnetization(Ms) range from 47.77 emu/g to 95.34 emu/g and the magnetic anisotropy field(H_a) range from 10700.60 Oe(1 Oe=79.5775 A·m^(-1)) to 13739.57 Oe,depending on the type of cation substitution in the hexagonal *** dielectric permittivity and dielectric loss decrease with increasing frequency of the AC electric field in the low-frequency region,while they almost remain constant in the high-frequency *** charac teristics of easy regulation and preparation make it a potential candidate for use in microwave device applications.

关键词： W-type hexaferrite Raman spectra magnetic properties dielectric properties

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A TWO-PCSN-STFF Algorithm for Steel Industry Yard Vehicle Action Recognition

A TWO-PCSN-STFF Algorithm for Steel Industry Yard Vehicle Ac...

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第35届中国过程控制会议

作者： Hang Xiao Chunjie Yang xujie Zhang Zhe Liu Duojin Yan Yuchen Zhao College of Control Science and Engineering Zhejiang University

At present, iron and steel enterprises usually rely on manual observation to monitor the dust generated by largescale vehicle activities in the material store yard. However, this method is labor-intensive and cannot provide uninterrupted24-hour monitoring. Therefore, there is an urgent need for an intelligent monitoring system to identify the actions of vehicles on industrial sites, enabling uninterrupted unmanned monitoring and alert systems for dust in the yard. This paper proposes a novel two-stream vehicle action recognition model, incorporating a pruning-channel-separated convolution(PCSN) mechanism and a spatiotemporal feature fusion module(STFF), to process real-time video streams from steel yards. The proposed model consists of two specifically designed paths: the environment path, which extracts spatial features, and the action path, which extracts temporal features. The STFF is then employed to integrate the temporal characteristics of the action path into the environment path, thereby facilitating efficient fusion of spatiotemporal features. Additionally, the PCSN mechanism is designed to optimize the original Resnet 3D module during convolution operations. Ultimately, while maintaining the method's accuracy,the proposed approach is well-suited for deployment and real-time monitoring, providing valuable information for the subsequent dust suppression treatment.

关键词： Vehicle Action Recognition Spatiotemporal Feature Fusion Model Lightweight Attention Mechanism

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新媒体时代红色文化与思想政治教育的融合探赜

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成才之路 2024年第25期 25-28页

作者：冯栩杰江门职业技术学院广东江门529000

红色文化与高校思想政治教育的融合不仅有助于坚定大学生理想信念,提升大学生文化自信,涵养社会风气,而且能助力思想政治教育发展,推动红色文化基地建设,推进社会主义文化强国建设。新媒体时代,高校在融合红色文化与思想政治教育的过程... 详细信息

红色文化与高校思想政治教育的融合不仅有助于坚定大学生理想信念,提升大学生文化自信,涵养社会风气,而且能助力思想政治教育发展,推动红色文化基地建设,推进社会主义文化强国建设。新媒体时代,高校在融合红色文化与思想政治教育的过程中,应深化思想引领与协同联动,构建全面的信息化平台,注重实践教学与生活融合,创新教学形式与信息技术引入,以完成立德树人根本任务,培养更多合格的社会主义建设者和接班人。

关键词：新媒体红色文化思想政治教育融合立德树人

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集成AI大语言模型的在线编程实验平台设计与实现

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实验技术与管理 2024年第8期41卷 215-221页

作者：厉旭杰顾雨辰姚持恩温州大学计算机与人工智能学院浙江温州325035

传统在线编程实验平台受限于反馈信息的局限性、忽视代码风格及规范性、代码的可读性、代码的效率等多种因素,不利于学生的学习和发展。该文设计并实现了一个集成AI大语言模型的在线编程实验平台方案,该方案在传统平台基础上,引入了大... 详细信息

传统在线编程实验平台受限于反馈信息的局限性、忽视代码风格及规范性、代码的可读性、代码的效率等多种因素,不利于学生的学习和发展。该文设计并实现了一个集成AI大语言模型的在线编程实验平台方案,该方案在传统平台基础上,引入了大语言模型的实时代码建议、程序安全扫描和判题结果分析优化功能。通过AI大语言模型的实时分析、诊断和优化建议,大大提高了教学效果,增强了学生与系统的互动,能够使学生更好的理解编程概念并提升解决问题的能力。该研究证实了AI模型在编程教育中的价值,并为人工智能在高等教育技术的应用提供了新的视角和策略。

关键词：大语言模型编程实验平台程序设计人工智能

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热处理对木材多尺度结构及力学性能影响的研究现状

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材料导报 2024年第18期38卷 277-284页

作者：王旭洁雒翠梅母军漆楚生北京林业大学木质材料科学与应用教育部重点实验室北京100083 北京林业大学材料科学与技术学院木材科学与工程北京市重点实验室北京100083

热处理是一种改善木材尺寸稳定性的重要方法,同时会引起木材多尺度结构变化,进而影响热处理材的微宏观力学性能。本文从纳米、微米、毫米三个尺度总结了热处理对木材结构单元及力学性能的影响。在纳米尺度,热处理过程中木材半纤维素大... 详细信息

热处理是一种改善木材尺寸稳定性的重要方法,同时会引起木材多尺度结构变化,进而影响热处理材的微宏观力学性能。本文从纳米、微米、毫米三个尺度总结了热处理对木材结构单元及力学性能的影响。在纳米尺度,热处理过程中木材半纤维素大量降解导致其作为界面偶联剂的基质特性被破坏;纤维素的羟基与半纤维素降解产生的有机酸发生酯化反应,其分子间氢键以及与半纤维素连接的氢键大量断裂,引起分子链断裂,削弱了半纤维素与纤维素之间的结合强度;多糖解聚引起木质素相对含量变化,木质素自缩聚反应以及与多糖降解产物发生的交联反应是热处理后细胞壁基质力学性能发生变化的重要因素。在微米尺度,热处理木材细胞壁胞间层出现裂缝,各细胞间产生分离,微纤丝的定向排列规律性下降、倾角增大,沿微纤丝长度方向断裂,进而引起细胞壁力学强度明显下降。在毫米尺度,早晚材的横切面上由方形、圆形变成椭圆形,其中早材开裂较多;径切面上管胞和导管的胞壁变形开裂,随着热处理程度增加,胞壁出现垂直轴向断裂、纹孔破坏、木射线开裂等现象,射线薄壁细胞被大量破坏,进而引起木材的载荷承载能力下降。本文可以为深入研究热处理对木材各尺度结构及力学性能的影响机制提供参考。

关键词：木材热处理多尺度结构力学性能

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儒、道文化与大学生焦虑的关系:基于文化启动实验和内隐联想测验的证据

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心理学探新 2024年第3期44卷 241-247页

作者：付进黎玉兰邹许杰华南师范大学教育科学学院广州510631 南宁师范大学教育科学学院南宁530299

近年来,我国大学生的焦虑检出率逐年上升;而现有研究大多从外显层面上聚焦于个体或环境因素对焦虑的影响,较少涉及到文化因素的影响。为此,研究打算从外显和内隐的层面检验儒家、道家文化与大学生焦虑之间的关系。实验一采用文化启动实... 详细信息

近年来,我国大学生的焦虑检出率逐年上升;而现有研究大多从外显层面上聚焦于个体或环境因素对焦虑的影响,较少涉及到文化因素的影响。为此,研究打算从外显和内隐的层面检验儒家、道家文化与大学生焦虑之间的关系。实验一采用文化启动实验范式,对90名大学生进行被试间设计,考察儒家文化、道家文化和中性条件对大学生焦虑的影响。结果发现,在控制特质焦虑后,儒家文化启动引发大学生状态焦虑水平的显著提升;而在道家文化启动条件和中性条件下,大学生的状态焦虑水平没有显著变化。实验二采用内隐联想测验,对另外90名大学生进行被试间设计,考察代表儒家文化、道家文化和中性条件的词汇与焦虑/平静类的属性词的内隐联系程度。结果发现,大学生倾向于将儒家文化与焦虑类的属性词进行内隐联系,而将道家文化与平静类的属性词进行内隐联系。结论:无论是从外显还是内隐的层面,儒家文化与焦虑有关;而道家文化在内隐层面上与平静有关。

关键词：文化启动实验内隐联想测验儒家文化道家文化焦虑

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