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Thermal and mechanical characterization of under-2-μm-thick AlCrNbSiTi high-entropy thin film

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Energy Storage and Saving 2024年第1期3卷 52-59页

作者： Yibo Wang Xiaona huang Yan Liu xiangyu Zhang Bing Yang Yanan Yue School of Power and Mechanical Engineering Wuhan UniversityWuhan430072China

High-entropy alloys(HEAs)exhibit extraordinary physical properties such as superior strength-to-weight ratios and enhanced corrosion and oxidation resistance,making them potentially useful in energy storage and gener-ation ***,thermal and mechanical properties of HEAs with various compositions vary ***,these properties have rarely been investigated simultaneously owing to material or instru-mentation ***,we synthesize an HEA(AlCrNbSiTi)coating with a thickness of less than 2μ*** customize a frequency-domain photothermal testing system to characterize the thermal and mechanical proper-ties of the proposed coating with high *** to the large mixing enthalpy of the Al-Ti,Nb-Si,and Ti-Si pairs in the coating,its hardness and elastic modulus are 15.2 and 254.7 GPa,respectively,which are higher than those of previously reported *** thermal conductivity of the AlCrNbSiTi coating is characterized to be 2.90 W·m^(−1)·K^(−1),within the expected range and well explained by the free-electron consistency diversity and phonon scattering from the amorphous ***,the coating exhibits adequate wear performance,with a wear rate of 5.4×10^(−8) mm^(3)·N^(−1)·m^(−1).This relatively low thermal conductivity,combined with extraordi-nary mechanical properties,makes the proposed material an excellent candidate as a protective coating material for nuclear reactor components which require high strength,irradiation resistance,and thermal protection.

关键词： High-entropy alloys Thin coating Thermal conductivity Mechanical properties Noncontact photothermal technique

Utilization of 3D printing technology in hepatopancreatobiliary surgery

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2024年第2期25卷 123-134页

作者： Wujiang SHI Jiangang WANG Jianjun GAO Xinlei ZOU Qingfu DONG Ziyue huang Jialin SHENG Canghai GUAN Yi XU Yunfu CUI xiangyu ZHONG Department of Hepatopancreatobiliary Surgery the Second Affiliated Hospital of Harbin Medical UniversityHarbin150086China Department of General Surgery Tangdu HospitalAir Force Medical UniversityXi’an710032China Key Laboratory of Basic Pharmacology of Ministry of Education Zunyi Medical UniversityZunyi563006China Key Laboratory of Functional and Clinical Translational Medicine Fujian Province UniversityXiamen Medical CollegeXiamen361000China Department of Pathology Li Ka Shing Faculty of MedicineThe University of Hong KongHong KongChina Jiangsu Province Engineering Research Center of Tumor Targeted Nano Diagnostic and Therapeutic Materials Yancheng Teachers UniversityYancheng224007China Key Laboratory of Biomarkers and In Vitro Diagnosis Translation of Zhejiang Province Hangzhou310053China Key Laboratory of Gastrointestinal Cancer(Fujian Medical University) Ministry of EducationSchool of Basic Medical SciencesFujian Medical UniversityFuzhou350122China Key Laboratory of Myocardial Ischemia Harbin Medical UniversityMinistry of EducationHarbin150086China

The technology of three-dimensional(3D)printing emerged in the late 1970s and has since undergone considerable development to find numerous applications in mechanical engineering,industrial design,and *** biomedical science,several studies have initially found that 3D printing technology can play an important role in the treatment of diseases in hepatopancreatobiliary *** example,3D printing technology has been applied to create detailed anatomical models of disease organs for preoperative personalized surgical strategies,surgical simulation,intraoperative navigation,medical training,and patient ***,cancer models have been created using 3D printing technology for the research and selection of chemotherapy *** the aim to clarify the development and application of 3D printing technology in hepatopancreatobiliary surgery,we introduce seven common types of 3D printing technology and review the status of research and application of 3D printing technology in the field of hepatopancreatobiliary surgery.

关键词： 3D printing Hepatopancreatobiliary surgery Organ model Cancer model

Silk materials for medical, electronic and optical applications

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Science China(Technological Sciences) 2019年第6期62卷 903-918页

作者： FAN SuNa ZHANG Yi huang xiangyu GENG LiHong SHAO HuiLi HU XueChao ZHANG YaoPeng State Key Laboratory for Modification of Chemical Fibers and Polymer Materials International Joint Laboratory for Advanced Fiber and Low-Dimension Materials College of Materials Science and Engineering Donghua University Shanghai 201620 China Key Laboratory of Polymer Materials and Products of Universities in Fujian Fujian University of Technology Fuzhou 350118 China

Silk derived from the silkworm Bombyx mori is among the most important fibrous protein biomaterials due to large-scale production from natural sources, excellent biocompatibility, unique mechanical properties and controllable degradation. Silk fibroin can be processed into a variety of formats to match different applications, such as tissue engineering, drug delivery or as the passive substrate of a bio-device. Advances in fabrication technologies provide new possibilities for the combination of silk fibroin with other nanomaterials to functionalize silk fibroin for specialized purposes, including sensing, cell visualization,resistance to ultraviolet light and provision of antibacterial properties. As the requirement for wearable and intelligent devices has become increasingly important over recent years, silk fibroin has been utilized as the active element in electronic and optical instruments. This review summarizes these recent advances in the innovative applications of silk fibroin.

关键词： silk fibroin tissue engineering drug delivery electronic devices sensor optics

Time domain characteristic analysis of non-coupled PCNN

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Optoelectronics Letters 2024年

作者： DENG xiangyu YU Haiyue huang Xikai College of Physics and Electronic Engineering Northwest Normal University

Pulse-coupled neural network (PCNN) is a multi-parameter artificial neural network， and the characteristics of PCNN can be fully explored by analyzing different simplified networks. In this paper， the firing characteristics of non-coupled PCNN with coupled linking term are studied， the mathematical expressions of firing time and interval are summarized， and further analyze the influence of linking weight matrix and linking weight coefficient on network characteristics， and give the constraints of parameters. Finally， extensive verification experiments were carried out for the phenomenon of image edge detection that occurs in the experiments， which provides theoretical support for further research and application of PCNN model.

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GeoChip-based microbial functions in biogeochemical cycles and their responses to environmental factors in Tengchong hot springs

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Journal of Earth Science 2024年

作者： Muhammad Inayat Ullah Khan Liuqin huang Geng Wu Jian Yang xiangyu Guan Hongchen Jiang School of Environmental Studies China University of Geosciences School of Ocean Sciences China University of Geosciences Beijing State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences

Microorganisms actively participate in biogeochemical cycling processes and play a crucial role in maintaining the dynamic balance of hot spring ecosystems. However， the distribution of microbial functional genes and their influencing factors in hot springs remain largely unclear. Therefore， this study investigated the microbial functional genes and their potential for controlling biogeochemical cycles (C， N， S， and P) in the hot Springs of Tengchong， China， using the Geochip method， a functional gene microarray technology. The examined hot springs have very different microbial functional genes. A total of 22736 gene probe signals were identified， belonging to 567 functional genes and associated with 15 ecological functions， mainly involving stress response， carbon cycle， nitrogen cycle， sulfur cycle， phosphorus cycle and energy processes. The amyA， narG， dsrA and ppx genes were most abundant in carbon， nitrogen， sulfur and phosphorus cycles， respectively， and were significantly correlated with pH， temperature and SO42-. The diversity and abundance of detected gene probes were negatively correlated with temperature. The α-diversity (i.e.， Shannon index) was high at low temperature and low pH. Molecular functional interactions revealed by the gene connectivity levels were negatively correlated with temperature， pH and SO42-. These results suggested that the abundance， diversity and interactions of microbial functional genes were significantly influenced by geochemical parameters?. In addition， some genera possessed functional genes related to carbon， nitrogen， sulfur， and phosphorus cycles and can synergistically control the biogeochemical cycles of carbon， nitrogen， sulfur and phosphorus. These findings provide new insights into the functional potentials of microorganisms to participate in biogeochemical cycles and their responses to environmental factors in hot springs.

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A Data-Driven Research of Sales and Purchases on *** Platform

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Intelligent Information Management 2021年第1期13卷 31-49页

作者： xiangyu huang Shanghai Starriver Bilingual School Shanghai China

Unlike consumers in the mall or supermarkets, online consumers are “intangible” and their purchasing behaviors are affected by multiple factors, including product pricing, promotion and discounts, quality of products and brands, and the platforms where they search for the product. In this research, I study the relationship between product sales and consumer characteristics, the relationship between product sales and product qualities, demand curve analysis, and the search friction effect for different platforms. I utilized data from a randomized field experiment involving more than 400 thousand customers and 30 thousand products on ***, one of the world’s largest online retailing platforms. There are two focuses of the research: 1) how different consumer characteristics affect sales;2) how to set price and possible search friction for different channels. I find that JD plus membership, education level and age have no significant relationship with product sales, and higher user level leads to higher sales. Sales are highly skewed, with very high numbers of products sold making up only a small percentage of the total. Consumers living in more industrialized cities have more purchasing power. Women and singles lead to higher spending. Also, the better the product performs, the more it sells. Moderate pricing can increase product sales. Based on the research results of search volume in different channels, it is suggested that it is better to focus on app sales. By knowing the results, producers can adjust target consumers for different products and do target advertisements in order to maximize the sales. Also, an appropriate price for a product is also crucial to a seller. By the way, knowing the search friction of different channels can help producers to rearrange platform layout so that search friction can be reduced and more potential deals may be made.

关键词： E-Tailing Data-Driven Research Sales Price-Discrimination Search-Friction Channels Consumer Behavior

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地外天体着陆自主避障制导技术研究进展

宇航学报 2023年第12期44卷 1785-1796页

作者：朱圣英杨贺黄翔宇崔平远北京理工大学宇航学院北京100081 深空自主导航与控制工业和信息化部重点实验室北京100081 北京控制工程研究所北京100094 空间智能控制技术全国重点实验室北京100094

基于地外天体软着陆探测任务的需求,阐述了地外天体着陆自主避障制导技术的研究进展。首先对典型的地外天体着陆探测任务进行回顾与分析,并总结了着陆避障制导面临的形貌复杂多样、控制资源受限、避障精度要求高、星载计算资源有限等挑... 详细信息

基于地外天体软着陆探测任务的需求,阐述了地外天体着陆自主避障制导技术的研究进展。首先对典型的地外天体着陆探测任务进行回顾与分析,并总结了着陆避障制导面临的形貌复杂多样、控制资源受限、避障精度要求高、星载计算资源有限等挑战与难点。在此基础上,从自主障碍评估和自主障碍规避两个方面梳理了着陆避障制导的研究现状。最后,结合未来地外天体探测任务需求,对着陆避障制导技术的发展方向进行了展望。

关键词：地外天体探测地外天体着陆自主障碍评估自主避障制导

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固推约束下的火星表面起飞上升制导律设计

宇航学报 2022年第11期43卷 1479-1486页

作者：郭敏文李琨黄翔宇郭延宁北京控制工程研究所北京100094 哈尔滨工业大学航天学院控制科学与工程系哈尔滨150001

针对受固推约束的火星上升器(MAV)起飞上升问题,设计了上升段、无动力滑行段、入轨段三段式火星表面起飞上升全过程制导策略。首先,根据实际任务需求进行了上升器标称轨迹优化。其次,在上升段引入了阿波罗制导方法,通过类攻角和类侧滑... 详细信息

针对受固推约束的火星上升器(MAV)起飞上升问题,设计了上升段、无动力滑行段、入轨段三段式火星表面起飞上升全过程制导策略。首先,根据实际任务需求进行了上升器标称轨迹优化。其次,在上升段引入了阿波罗制导方法,通过类攻角和类侧滑角的控制实现对标称轨迹的跟踪。为减少上升段末端偏差对无动力滑行段与标称轨迹间误差的影响,提出了一种通过调整倾侧角改变上升器所受气动力进而控制飞行轨迹的技术路线,并设计了相应的滑模制导律。另外,兼顾固推发动机的能量管理需求,针对入轨段设计了Lambert制导策略,并参考标称控制量对其进行修正,使得上升器能够在控制能力有限的情况下完成较高精度的入轨。最后,通过典型场景火星表面起飞上升全过程数值仿真验证了所设计策略的有效性和鲁棒性。

关键词：火星上升器阿波罗制导轨迹跟踪制导滑模制导 Lambert制导

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基于天体三维模型的着陆段视觉导航方法

中国科学：物理学、力学、天文学 2022年第1期52卷 14-23页

作者：田阳杨文浩黄翔宇哈尔滨工业大学航天学院哈尔滨150001 北京控制工程研究所北京100094

针对深空探测精确着陆的需求,本文提出一种基于天体三维模型的着陆器视觉导航方法.该方法以天体三维模型为数据基础,根据着陆器初始猜测状态在线生成导航地图,通过已知路标匹配确定着陆器相对着陆点位置姿态;借助三维模型提供的深度信... 详细信息

针对深空探测精确着陆的需求,本文提出一种基于天体三维模型的着陆器视觉导航方法.该方法以天体三维模型为数据基础,根据着陆器初始猜测状态在线生成导航地图,通过已知路标匹配确定着陆器相对着陆点位置姿态;借助三维模型提供的深度信息配准像素灰度,恢复序列图像帧间运动,给出两次已知路标匹配之间的局部运动轨迹,实现着陆下降过程着陆器状态的准确估计.在线生成参考地图与实际采集的天体图像在尺度、视角等方面比较接近,更易于导航路标的匹配,解决了下降过程尺度大范围变化使路标难以匹配的问题.引入像素深度信息辅助灰度配准,通过搜索图像间平移和旋转使图像中的全部特征灰度差异最小,采用了全局优化思想,因此可以克服特征匹配过程易陷入局部极小,出现误匹配的问题,具有更高的帧间运动估计精度和稳定性.数学仿真表明,本文提出的视觉导航方法具有良好的性能,满足深空探测高精度着陆的导航需求.

关键词：深空天体着陆天体三维模型视觉导航灰度配准路标匹配