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Pt nanodendrites with a PtIr alloy surface structure exhibit excellent stability toward acidic hydrogen evolution reaction

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Nano Research 2024年第6期17卷 4844-4849页

作者： Chang Liu Zongnan Wei minna Cao Rong Cao State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China University of Chinese Academy of Sciences Beijing 100049China Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China

The development of effective and stable electrocatalysts for the hydrogen evolution reaction(HER)in acidic electrolytes is a significant *** this work,homogeneous Pt nanodendrites(Pt NDs)with a PtIr shell were successfully synthesized by a two-step wet chemical *** open three-dimensional(3D)dendritic structure exhibited exceptional electrocatalytic characteristics,exposing as many active sites as ***,by alloying Ir with Pt on the surface,catalytic activity was greatly enhanced while ensuring extremely high *** surface-enriched platinum nanodendritic catalysts(Pt@PtIr NDs)outperformed the control samples and the commercial *** acidic HER test,Pt@PtIr NDs had a lower overpotential(22 mV)than Pt NDs(26 mV)and commercial Pt/C(31 mV)at 10 mA/cm^(2),and the activity of Pt@PtIr NDs remained consistent even after undergoing a continuous durability test for at least 168 h,which was much superior to the performance of commercial Pt/C(10 h)under identical test *** study revealed that the application of 3D Pt dendritic metal alloys may offer a chance for the development of enhanced electrocatalysts in acidic HER.

关键词： Pt nanodendrites iridium high stability hydrogen evolution reaction alloy

mUS model:A Deep Learning-Based Architecture for IoT Intrusion Detection

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Computers, materials & Continua 2024年第7期80卷 875-896页

作者： Yu Yan Yu Yang Shen Fang minna Gao Yiding Chen College of Information Engineering University of Engineering of the Chinese People’s Armed Police Force(PAP)Xi’an710000China College of missile Engineering Rocket Force Engineering UniversityXi’an710000China

In the face of the effective popularity of the Internet of Things(IoT),but the frequent occurrence of cybersecurity incidents,various cybersecurity protection means have been proposed and *** them,Intrusion Detection System(IDS)has been proven to be stable and ***,traditional intrusion detection methods have shortcomings such as lowdetection accuracy and inability to effectively identifymalicious *** address the above problems,this paper fully considers the superiority of deep learning models in processing highdimensional data,and reasonable data type conversion methods can extract deep features and detect classification using advanced computer vision techniques to improve classification *** TransformField(mTF)method is used to convert 1Dnetwork traffic data into 2D images,and then the converted 2D images are filtered by Unsharpmasking to enhance the image details by sharpening;to further improve the accuracy of data classification and detection,unlike using the existing high-performance baseline image classification models,a soft-voting integrated model,which integrates three deep learning models,mobileNet,VGGNet and ResNet,to finally obtain an effective IoT intrusion detection architecture:the mUS *** types of experiments are conducted on the publicly available intrusion detection dataset CICIDS2018 and the IoT network traffic dataset N_BaIoT,and the results demonstrate that the accuracy of attack traffic detection is greatly improved,which is not only applicable to the IoT intrusion detection environment,but also to different types of attacks and different network environments,which confirms the effectiveness of the work done.

关键词： Cyberspace security intrusion detection deep learning markov Transition Fields(mTF) soft voting integration

Sub-10-nm-sized Au@AuxIr1-x metal-core/alloy-shell nanoparticles as highly durable catalysts for acidic water splitting

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National Science Review 2024年第4期11卷 130-140页

作者： Huimin Wang Zhe-ning Chen Yuanyuan Wang Dongshuang Wu minna Cao Fanfei Sun Rong Cao State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences University of Chinese Academy of Sciences School of materials Science and Engineering Nanyang Technological University Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied Physics Chinese Academy of Sciences Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China

The absence of efficient and durable catalysts for oxygen evolution reaction（OER） is the main obstacle to hydrogen production through water splitting in an acidic ele ***,we report a controllable synthesis method of surface IrOxwith changing Au/Ir compositions by constructing a range of sub-10-nm-sized core-shell nanocatalysts composed of an Au core and AuxIr1-xalloy *** particular,Au@Au0.43Ir0.57exhibits 4.5 times higher intrinsic OER activity than that of the commercial Ir/*** X-ray-based spectroscopies,electron microscopy and density functional theory calculations revealed a balanced binding of reaction intermediates with enhanced *** water-splitting cell using a load of 0.02 mgIr/cm2of Au@Au0.43Ir0.57as both anode and cathode can reach 10 mA/cm2at 1.52 V and maintain activity for at least194 h,which is better than the cell using the commercial couple Ir/C‖Pt/C（1.63 V,0.2 h）.

关键词： controllable synthesis of surface IrOx oxygen evolution reaction acidic water splitting catalytic stability transition metal catalysts

High-performance portable grating-based surface plasmon resonance sensor using a tunable laser at normal incidence

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Photonics Research 2024年第5期12卷 947-958页

作者： DUC LE ANNI RANTA-LASSILA TEEmU SIPOLA mIKKO KARPPINEN JARNO PETAJA minna KEHUSmAA SANNA AIKIO TIAN-LONG GUO mATTHIEU ROUSSEY JUSSI HILTUNEN ALEXEY POPOV VTT Technical Research Centre of Finland 90570 OuluFinland Department of Physics and mathematics University of Eastern FinlandFI-80101 JoensuuFinland

Surface plasmon resonance(SPR)sensors are among the most sensitive *** such devices,a grating is a compelling alternative to a prism for the excitation of a surface plasmon,especially in the development of sensors for point-of-care applications due to their compactness and ***,we demonstrate the use of a tunable laser in a grating-based SPR system for further miniaturization and *** tunable laser working at normal incidence replaces spectral and moving components,while also simplifying the optical *** incidence is conventionally avoided due to the complexity of the control of degenerated SPR *** investigate,both computationally and experimentally,the splitting of the SPR modes at small nonzero incidences,which is lacking in previously reported *** optimizing the grating configuration,we were able to diminish the SPR mode splitting phenomenon when the excitation was feasible with the normal incidence *** fabricated sensor showed a high sensitivity of 1101.6 nm/***,the figure of merit of the sensor,defined as the ratio between the sensitivity and bandwidth of the SPR dip,was *** experimental results were consistent with the simulation *** also demonstrate its capability for detecting low concentrations of glucose and creatinine with the limit of detection of 14.2 and 19.1 mmol/L,respectively.

关键词： tunable splitting excitation

Research on Adaptability Analysis of Environmental Space Demand and Design Optimization of Daycare Centers: Taking Chongqing’s Community F as an Example

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Journal of World Architecture 2024年第3期8卷 49-56页

作者： Tijin Gui minna Yu Bin Chen Jun Tao Chongqing Institute of Engineering School of Civil Engineering and ArchitectureChongqing 400056China

Currently,there is a lack of research on the detailed environmental spatial design of community daycare centers at the micro *** study focuses on Community F in Chongqing,using the elderly’s“willingness to demand”as a central *** examines indoor and outdoor environmental space needs at a micro level,considering both functional requirements and spiritual needs based on existing *** analysis incorporates three adaptive elements:current construction,surrounding environment,and operational *** explores the feasibility of restructuring spatial layouts,utilizing local resources,and integrating Bayu cultural ***,through design optimization practices,the study proposes three strategies for aging optimization:functional integration and interaction,user-friendly facilities,and emotional connections to place.

关键词： Daycare center Environmental space Willingness to demand Design optimization

Gifted Students’Special Educational Programs in France:An Analysis of Students’Needs as Perceived by Headmasters-A Secondary Publication

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Journal of Contemporary Educational Research 2024年第4期8卷 316-327页

作者： Karine Buard minna Puustinen Amélie Courtinat-Camps Research Group on Disability AccessibilityEducational and School Practices(GRHAPES)INSHEAFrance Developmental and Educational Psychology “Psychology of Socialisation-Development and Work”Laboratory(LPS-DT)Toulouse Jean Jaurès UniversityFrance

Some French public middle schools offer gifted students the opportunity to pursue their education in general classes,while benefiting from specific facilities within the framework of a dedicated educational *** this study,we sought to identify and analyze the needs of these students as perceived by the headmaster of each middle school *** results highlight two main student needs,common to all these programs(uneasiness and difficulties in peer relationships)as well as needs specifically mentioned by some headmasters(non-adaptive behavior).

关键词： Learning difficulties Students in difficulty Education policies

支付还是契约?农村彩礼支付实践的类型化研究

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中国农村观察 2024年第2期 168-184页

作者：牟敏娜武汉大学社会学院

本文构建“支付-契约”的双重分析框架,对中国农村地区彩礼支付实践展开类型化研究。研究发现:彩礼为“财”又为“礼”。前者体现为彩礼的支付属性,是婚姻市场彩礼“定价”的外显机制,代表婚姻竞争的激烈程度。彩礼的支付属性越强,对婚... 详细信息

本文构建“支付-契约”的双重分析框架,对中国农村地区彩礼支付实践展开类型化研究。研究发现:彩礼为“财”又为“礼”。前者体现为彩礼的支付属性,是婚姻市场彩礼“定价”的外显机制,代表婚姻竞争的激烈程度。彩礼的支付属性越强,对婚姻规则的冲击越大。后者体现为彩礼的契约属性,代表婚姻实践中的社会规范与婚姻合意,体现婚姻缔结的秩序。彩礼的契约属性越强,对婚姻缔结的积极作用越明显。彩礼的支付属性和契约属性并非排他关系,而是存在不同的组合。根据多地田野调查和“支付-契约”双重分析框架,本文概括出四种彩礼支付实践的类型:弱支付-弱契约、强支付-弱契约、强支付-强契约、弱支付-强契约。不同彩礼支付实践类型塑造了不同的婚姻形态。因此,治理高价彩礼现象要根据具体情况差异化推进。

关键词：彩礼支付婚姻契约为权利义务关系婚姻稳定性

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Enhanced stability of FA-based perovskite:Rare-earth metal compound EuBr_(2) doping

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Chinese Physics B 2024年第4期33卷 669-675页

作者：候敏娜郭旭韩梅斗雪赵均陶王志元丁毅侯国付张宗胜韩小平 School of Energy and Power Engineering North University of ChinaTaiyuan 030051China Institute of Photoelectronic Thin Film Devices and Technology Nankai UniversityTianjin 300072China

It is highly desirable to enhance the long-term stability of perovskite solar cells(PSCs)so that this class of photovoltaic cells can be effectively used for the commercialization *** this contribution,attempts have been made to use the two-step sequential method to dope EuBr_(2)into FAmAPbI_(3)perovskite to promote the *** is shown that the device durability at 85℃in air with RH of 20%-40%is improved substantially,and simultaneously the champion device efficiency of 23.04%is *** enhancement in stability is attributed to two points:(ⅰ)EuBr_(2)doping effectively inhibits the decomposition andα-δphase transition of perovskite under ambient environment,and(ⅱ)EuBr_(2)aggregates in the oxidized format of Eu(BrO_(3))_(3)at perovskite grain boundaries and surface,hampering humidity erosion and mitigates degradation through coordination with H_(2)O.

关键词： EuBr_(2) doping inhibited phase transition and decomposition stability perovskite solar cell

虚拟现实技术在沉浸式场景漫游系统中的应用分析

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软件 2024年第5期45卷 181-183页

作者：王敏娜晋中信息学院山西晋中030800

利用虚拟现实技术搭设的场景,可以使用户产生身临其境的感受,在沉浸式场景漫游系统中利用虚拟现实技术,有利于提高用户移动和交互的便利性和自由性。本文主要以三多堂博物馆场景为基础分析了虚拟现实技术在沉浸式场景漫游系统中的应用,... 详细信息

利用虚拟现实技术搭设的场景,可以使用户产生身临其境的感受,在沉浸式场景漫游系统中利用虚拟现实技术,有利于提高用户移动和交互的便利性和自由性。本文主要以三多堂博物馆场景为基础分析了虚拟现实技术在沉浸式场景漫游系统中的应用,以期对于类似工作的开展提供参考。

关键词：虚拟现实技术沉浸式场景漫游系统应用分析