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Tailoring the surface and interface structures of photocatalysts to enhance hydrogen production

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Science China Chemistry 2024年第4期67卷 1161-1174页

作者： Tao Zhang Pengfei Wang shuai yue Fei Li Zhiyong Zhao Sihui Zhan MOE Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Key Laboratory of Environmental Remediation and Pollution Control College of Environmental Science and EngineeringNankai UniversityTianjin 300350China

Photocatalytic water splitting using semiconductor photocatalysts is a promising approach for the production of carbon-neutral,sustainable and clean hydrogen fuel.However,the separation and transport of photoinduced carriers are generally considered to be rate-limiting steps,and their low efficiency remains a major challenge.Therefore,much effort has been devoted to developing new strategies in surface/interface engineering of photocatalysts to improve the dynamics of charge separation/transport.This feature article briefly summarizes recent advances in photocatalyst surface/interface engineering by our research group,which have been achieved through the design of various novel photocatalysts,including interfacial modulation,heterostructure construction,heteroatom doping,single atom and diatom sites.The article is divided into three parts:first,we briefly introduce the three key processes involved in solar water splitting and reveal relationships between the properties of nanostructural photocatalysts and the fundamentals of water splitting;second,we detail methods and strategies for surface and interfacial structures to improve the efficiency of the fundamental processes,especially charge separation;finally,we explore prospects for photocatalytic water splitting applications.This article provides a valuable resource and strategies for researchers currently working in the field of photocatalytic water splitting.

关键词： photocatalytic water splitting surface/interface structures dual-functional photocatalysis

Dynamics of Exciton Transport in Two-Dimensional Materials

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中国激光 2023年第1期50卷 126-137页

作者： Xia yuexing Zhang shuai Wu Keming Gong Yiyang yue shuai Liu Xinfeng CAS Key Laboratory of Standardization and Measurement for Nanotechnology National Center for Nanoscience and TechnologyBeijing 100190China University of Chinese Academyof Sciences Beijing 100049China

In recent years,two-dimensional(2D)materials have attracted extensive interests due to the large exciton binding energy different from bulk materials.Many peculiar properties have been discovered that have farreaching perspectives in the next generation of optoelectronic devices.In this review,we introduce the forms of exciton existence in 2D materials and several promising 2D materials with good applications at first.Then,we summarize relevant contemporary tools for probing exciton dynamics and methods of regulating 2D exciton transport,for instance,electrical regulation,stress/surface wave regulation and moirépotential regulation,etc.Finally,we conclude the general development of regulation in 2D materials and propose several possible opportunities of application prospect.

关键词： materials exciton diffusion transition metal dichalcogenide van deer Waals heterostructure trion moiréexciton

基于高斯引导滤波MSRCR的奶牛夜间低质量图像增强方法

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黑龙江畜牧兽医 2024年第8期 37-45页

作者：岳帅秦立峰西北农林科技大学机械与电子工程学院陕西杨凌712100 农业农村部农业物联网重点实验室陕西杨凌712100

为了解决奶牛夜间图像存在颜色失真、边缘细节丢失与噪声干扰等低质量问题,试验提出了一种基于高斯引导滤波的彩色恢复多尺度Retinex(multi-scale Retinex with color restoration, MSRCR)图像增强算法,即先利用多尺度高斯滤波函数处理... 详细信息

为了解决奶牛夜间图像存在颜色失真、边缘细节丢失与噪声干扰等低质量问题,试验提出了一种基于高斯引导滤波的彩色恢复多尺度Retinex(multi-scale Retinex with color restoration, MSRCR)图像增强算法,即先利用多尺度高斯滤波函数处理原始夜间图像得到粗糙照度分量,再利用引导滤波(guided filtering, GF)函数处理获得精确照度分量,然后结合四方向Sobel边缘检测器进行反射分量自适应权值优化,最后通过对数加法将照度分量和反射分量合成增强图像。试验以3组(1组为均匀光照灰度图像、2组为均匀光照彩色图像、3组为非均匀光照彩色图像)夜间不同成像条件下的180幅图像为研究对象,以平均梯度(mean gradient, MG)、标准差(standard deviation, S)、信息熵(information entropy, IE)、边缘保持指数(edge preserving index, EPI)、结构相似性指数(structural similarity index, SSIM)、峰值信噪比(peak signal to noise ratio, PSNR)和运行时间为评价指标,比较分析本算法和直方图均衡(histogram equalization, HE)算法、基于GF的多尺度Retinex算法(即GF+MSR算法)、MSRCR算法和光照自适应Retinex (illuminated adaptation Retinex, IAR)算法的图像增强效果。结果表明:与原图像比,本算法增强后图像的MG值较HE、GF+MSR、MSRCR和IAR算法增强后图像分别提高了72.22%、150.00%、41.67%和31.67%,IE值分别提高了30.42%、56.90%、43.28%、8.65%;S值较GF+MSR、MSRCR和IAR算法增强后图像分别提高了68.61%、74.28%、54.62%,较HE算法增强后图像降低了55.54%。本算法增强后图像的EPI值较HE、GF+MSR、MSRCR和IAR算法分别提高了34.70%、23.72%、51.41%、12.11%,SSIM分别提高了14.47%、9.33%、5.09%、18.19%;PSNR值较经HE、GF+MSR、MSRCR算法增强后图像分别提高了30.12%、11.52%、20.05%,较IAR算法增强后图像降低了0.67%;同时本算法运行时间分别较HE、GF+MSR、IAR算法减少了67.55%、32.81%、10.14%,而较MSRCR算法增加了139.47%。说明本算法能够有效增强夜间图像的边缘信息并抑制噪声干扰,提高了夜间奶牛图像的质量。

关键词：夜间图像增强彩色恢复多尺度Retinex(MSRCR) 高斯滤波引导滤波四方向Sobel边缘检测器

A novel durable intelligent fiber reinforced polymer anchor with embedded optical fiber Bragg grating sensors

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中国科学：技术科学英文版 2012年第5期55卷 1455-1462页

作者： HUANG MingHua ZHOU Zhi yue shuai HE JianPing OU JinPing School of Civil Engineering Harbin Institute of TechnologyHarbin 150090China Faculty oflnfrastructure Engineering Dalian University of TechnologyDalian 116024China

Anchors are the key members of the geotechnical anchorage engineering, it is urgent to monitor their behavior in service for preventing the potential risks. This paper proposes a novel durable intelligent fiber reinforced polymer (FRP) anchor to understand the behavior of the anchor in the field application. Series of optical fiber Bragg grating (FBG) sensors were embedded into the central axis along the anchor to sense itself axial strain variations. An evolution model of axial strain was also developed to evaluate the behavior along the anchor. A demonstration test was carried out to test its self-sensing properties in the laboratory. The experimental results indicated that the embedded FBG sensors monitored the behavior, e.g. axial strain/interfacial damage evolutions along the anchor and displacement/applied load at the pulling end effectively, without influence from the interfacial compression and slip effects.

关键词：岩土锚固工程光纤光栅传感器纤维增强聚合物嵌入式智能耐用纤维增强复合材料 FBG传感器

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空间长方形绳网展开动力学及多参数特性分析

北京航空航天大学学报 2024年第3期50卷 994-1004页

作者：李梦生岳帅杜忠华张庆展刘洲刘志南京理工大学机械工程学院南京210000 上海宇航系统工程研究所上海201109

空间绳网系统是一种针对空间碎片的柔性捕获系统,针对带有太阳翼的空间目标,提出一种用于捕获目标主体的长方形绳网。为分析其展开效果,建立有限元模型,通过对比地面试验结果来验证有限元模型的可靠性。建立长方形绳网的评价指标,并通... 详细信息

空间绳网系统是一种针对空间碎片的柔性捕获系统,针对带有太阳翼的空间目标,提出一种用于捕获目标主体的长方形绳网。为分析其展开效果,建立有限元模型,通过对比地面试验结果来验证有限元模型的可靠性。建立长方形绳网的评价指标,并通过各项评价指标对比不同牵拉模式、牵引绳分布圆直径及牵引体发射角度下的绳网展开特性。结果表明:仿真结果与试验结果吻合,有限元模型可靠;在八点牵拉、十点牵拉和十二点牵拉3种模式下,十点牵拉所能达到的展开效果最好;牵引绳分布圆直径增大,所能达到的最大展开面积和保形距离减小,展开距离增大;牵引体的发射角度增大,长方形绳网的最大展开面积和保形距离增大,展开距离减小。

关键词：空间碎片柔性捕获长方形绳网太阳翼多参数分析

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适应火工装置冲击环境的铝蜂窝缓冲特性研究

振动与冲击 2024年第5期43卷 292-301,314页

作者：史文辉岳帅刘洲肖余之杜忠华刘志高光发南京理工大学机械工程学院南京210094 上海宇航系统工程研究所上海201109 上海航天技术研究院上海201109

针对火工装置发射过程中对卫星平台产生的冲击,设计了一种基于铝蜂窝的新型空间发射缓冲结构,通过火药密爆试验和铝蜂窝准静态压溃试验分别建立了空间火工发射装置内弹道模型和铝蜂窝压溃模型,在此基础上建立了发射后坐动力学模型,并重... 详细信息

针对火工装置发射过程中对卫星平台产生的冲击,设计了一种基于铝蜂窝的新型空间发射缓冲结构,通过火药密爆试验和铝蜂窝准静态压溃试验分别建立了空间火工发射装置内弹道模型和铝蜂窝压溃模型,在此基础上建立了发射后坐动力学模型,并重点研究了火药药量和铝蜂窝内径对发射后坐特性的影响。研究结果表明:当火药药量增大0.3 g,后坐力平均值增大了1.95%,牵引体发射速度增大了5.10%,后坐位移增大了7.64%,后坐力持续时间减小10.3%。当铝蜂窝内径从148 mm分别减小1 mm和2 mm时,后坐力平均值增大了4.06%和9.08%,牵引体发射速度增大了0.22%和0.54%,后坐位移增大了3.38%和15.24%。同时以上参数的合理选择可以有效降低发射后坐力并保证牵引体的发射性能。

关键词：火工装置铝蜂窝发射后坐缓冲特性

Modeling and experimental validation of vertical landing reusable launch vehicle under symmetric landing conditions

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Chinese Journal of Aeronautics 2022年第12期35卷 156-172页

作者： shuai yue Qing LIN Guang ZHENG Zhonghua DU School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China Aerospace System Engineering Shanghai Shanghai 201109China Key Laboratory of Impact and Safety Engineering Ministry of EducationNingbo UniversityNingbo 315211China

This paper illustrates the dynamic modeling,experimental validation of Reusable Launch Vehicle under symmetric landing mode.Firstly,a new quasi-3D dynamic landing model of vehicle under 2-2 and 1-2-1 symmetric landing mode is established,which can predict the plane motion of the main body and the spatial motion of landing struts and footpads.The strut force,footpad-ground contact force and the liquid spring damper are also included in the model.Secondly,the landing impact experiments are performed for 2-2 and 1-2-1 symmetric landing mode.The main and auxiliary strut force are obtained,along with the force-stroke diagram of damper.By comparing with experimental data,the accuracy of simulation model is verified.It is found that the simulation model possesses good match with tested responses in damping stroke and main strut force.The simulation and experiment also indicate the same trend in auxiliary strut force and main body acceleration.The main discrepancies attribute to the simplified structural flexibility and nonlinear contact。

关键词： Dynamics Impact Landing gear Launch vehicle Modeling

PBL联合EBL教学法在心内科专业型研究生教学中的应用价值

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中国病案 2024年第6期25卷 97-99页

作者：张然闫浩杰岳帅中国人民解放军总医院第六医学中心心血管病医学部北京市100853

问题式学习教学法强调以学生为核心,以问题为引导,致力于培养学生的创新思维、自主学习能力以及批判性思维,项目式学习教学法同样以学生为中心,但更聚焦于运用临床循证医学资料作为依据,即通过评估大量的临床信息,获取高质量的研究证据... 详细信息

问题式学习教学法强调以学生为核心,以问题为引导,致力于培养学生的创新思维、自主学习能力以及批判性思维,项目式学习教学法同样以学生为中心,但更聚焦于运用临床循证医学资料作为依据,即通过评估大量的临床信息,获取高质量的研究证据,并将最新的诊疗决策成果应用于教学中。与传统的教学模式相比,PBL联合EBL教学法强调了理论知识与临床实践的相结合,进而通过问题驱动的形式来激发学生的学习动力,帮助学生在临床实践中培养问题解决和决策的能力,从而协助专业型研究生顺利完成从实习医师到住院医师这一角色上的转变。本文系统地介绍了目前心血管内科专业型研究生的培养现状、PBL联合EBL教学法在心血管疾病诊疗中的重要性,以及其对心血管内科专业型研究生学习兴趣和积极性、临床诊治、科研思维的积极作用,提高心血管内科专业型研究生的培养水平。

关键词： PBL EBL 心血管内科教学1

Synergetic effects of gold-doped copper nanowires with low Au content for enhanced electrocatalytic CO_(2)reduction to multicarbon products

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Nano Research 2023年第5期16卷 7777-7783页

作者： Zongnan Wei shuai yue Shuiying Gao Minna Cao Rong Cao Department of Chemistry University of Science and Technology of ChinaHefei 230026China 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&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China

As efficient catalysts of electrochemical CO_(2)reduction reaction(CO_(2)RR)towards multicarbon(C_(2+))products,Cu-based catalysts have faced the challenges of increasing the reactive activity and selectivity.Herein,we decorated the surface of Cu nanowires(Cu NWs)with a small amount of Au nanoparticles(Au NPs)by the homo-nucleation method.When the Au to Cu mass ratio is as little as 0.7 to 99.3,the gold-doped copper nanowires(Cu-Au NWs)could effectively improve the selectivity and activity of CO_(2)RR to C_(2+)resultants,with the Faradaic efficiency(FE)from 39.7%(Cu NWs)to 65.3%,the partial current density from 7.0(Cu NWs)to 12.1 mA/cm^(2) under−1.25 V vs.reversible hydrogen electrode(RHE).The enhanced electrocatalytic performance could be attributed to the following three synergetic factors.The addition of Au nanoparticles caused a rougher surface of the catalyst,which allowed for more active sites exposed.Besides,Au sites generated*CO intermediates spilling over into Cu sites with the calculated efficiency of 87.2%,which are necessary for multicarbon production.Meanwhile,the interphase electron transferred from Cu to Au induced the electron-deficient Cu,which favored the adsorption of*CO to further generate multicarbon productions.Our results uncovered the morphology,tandem,electronic effect between Cu NWs and Au NPs facilitated the activity and selectivity of CO_(2)RR to multicarbons.

关键词： electrochemical CO_(2)reduction multicarbon production bimetallic catalyst Cu nanowires Au nanoparticles