检索结果-南通市图书馆

Landslide identification using machine learning

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2021年第1期12卷 351-364页

作者： Haojie Wang Limin Zhang Kesheng Yin hongyu luo Jinhui Li Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyHong Kong SARChina Department of Civil and Environmental Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

Landslide identification is critical for risk assessment and *** paper proposes a novel machinelearning and deep-learning method to identify natural-terrain landslides using integrated ***,landslide-related data are compiled,including topographic data,geological data and rainfall-related ***,three integrated geodatabases are established;namely,Recent Landslide Database(Rec LD),Relict Landslide Database(Rel LD)and Joint Landslide Database(JLD).After that,five machine learning and deep learning algorithms,including logistic regression(LR),support vector machine(SVM),random forest(RF),boosting methods and convolutional neural network(CNN),are utilized and evaluated on each database.A case study in Lantau,Hong Kong,is conducted to demonstrate the application of the proposed *** the results of the case study,CNN achieves an identification accuracy of 92.5%on Rec LD,and outperforms other algorithms due to its strengths in feature extraction and multi dimensional data *** methods come second in terms of accuracy,followed by RF,LR and *** using machine learning and deep learning techniques,the proposed landslide identification method shows outstanding robustness and great potential in tackling the landslide identification problem.

关键词： Landslide risk Landslide identification Machine learning Deep learning Big data Convolutional neural networks

Laser-driven programmable non-contact transfer printing of objects onto arbitrary receivers via an active elastomeric microstructured stamp

在线全文

学校读者我要写书评

暂无评论

National Science Review 2020年第2期7卷 296-304页

作者： hongyu luo Chengjun Wang Changhong Linghu Kaixin Yu Chao Wang Jizhou Song Department of Engineering Mechanics Soft Matter Research Center and Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Zhejiang University

Transfer printing, as an important assembly technique, has attracted much attention due to its valuable merits to develop novel forms of electronics such as stretchable inorganic electronics requiring the heterogeneous integration of inorganic materials with soft elastomers. Here, we report on a laser-driven programmable non-contact transfer printing technique via a simple yet robust design of active elastomeric microstructured stamp that features cavities filled with air and embedded under the contacting surface, a micro-patterned surface membrane that encapsulates the air cavities and a metal layer on the inner-cavity surfaces serving as the laser-absorbing layer. The micro-patterned surface membrane can be inflated dynamically to control the interfacial adhesion, which can be switched from strong state to weak state by more than three orders of magnitude by local laser heating of the air in the cavity with a temperature increase below 100℃. Theoretical and experimental studies reveal the fundamental aspects of the design and fabrication of the active elastomeric microstructured stamp and the operation of non-contact transfer printing. Demonstrations in the programmable transfer printing of micro-scale silicon platelets and micro-scale LED chips onto various challenging receivers illustrate the extraordinary capabilities for deterministic assembly that are difficult to address by existing printing schemes, thereby creating engineering opportunities in areas requiring the heterogeneous integration of diverse materials such as curvilinear electronics and Micro LED displays.

关键词： tunable adhesion transfer printing heterogeneous integration laser-driven

Preparation and biological evaluation of ^(99)Tc^m-labelled fatty acids

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2007年第3期18卷 159-163页

作者： LIANG Jixin HU Ji CHEN Baojun luo Lianzhe LI hongyu SHEN Langtao luo Zhifu Isotope Department China Institute of Atomic Energy Beijing 102413 China

The aim of the present work was to develop radiolabelling fatty acids based on 99Tcm carbonyl chemistry for heart imaging. Undecanoic acids functionalised with iminodiacetatic acid and cysteine were radiolabelled with [99Tcm (CO)3(H2O)3]+ intermediates, and their radiolabelling conditions were carefully studied. Biodistribution of 99Tcm (CO)3-CYST FAC11 and 99Tcm (CO)3-IDA FAC11 were observed in normal mice. The results showed that two 99Tcm-labelled compounds had similar profile in terms of high initial radioactivity uptake and rapid washout of radio- tracers in the heart. 99Tcm (CO)3-IDA FAC11 was mainly excreted via hepatobiliary system in contrast to 99Tcm (CO)3-CYST FAC11, which was excreted from urinary system. It may be in part attributed to the more lipophilicity of 99Tcm (CO)3-IDA FAC11 than 99Tcm (CO)3-CYST FAC11.

关键词：脂肪酸放射性同位素 ^99Tc^m 医学应用

Fe3O4 nanoparticles as a saturable absorber for a tunable Q-switched dysprosium laser around 3μm

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2020年第1期8卷 70-77页

作者： JIAN YANG JIYI HU hongyu luo JIANFENG LI JISHU LIU XIAOHUI LI YONG LIU State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of China(UESTC)Chengdu 610054China School of Physics and Information Technology Shaanxi Normal UniversityXi'an 710119China

We demonstrate for the first time to our knowledge the use of Fe3O4 nanoparticles for Q-switching a tunable midinfrared(Mid-IR)Dy^3+-doped ZBLAN fiber laser around 3μ*** Q-switcher was fabricated by depositing the prepared Fe3O4 nanoparticles solution onto an Au *** nonlinear optical response was characterized using a mode locked Ho^3+/Pr^3+-codoped ZBLAN fiber laser at 2.87μm,and showed a modulation depth of 11.9%as well as a saturation intensity of 1.44 MW/cm^*** the device into a tunable Dy^3+-doped ZBLAN fiber laser,stable Q-switched pulses within the tunable range of 2812.4-3031.6 nm were *** tuning the wavelength to 2931.2 nm,a maximum Q-switching output power of 111.0 mW was achieved with a repetition rate of 123.0 kHz and a pulse width of 1.25μ*** corresponding pulse energy was 0.90μ*** demonstration suggests that Fe3O4 nanoparticles are a promising broadband saturable absorption material for mid-infrared operation.

关键词： tunable switched laser

A thermal actuated switchable dry adhesive with high reversibility for transfer printing

在线全文

学校读者我要写书评

暂无评论

International Journal of Extreme Manufacturing 2021年第3期3卷 74-82页

作者： Shun Zhang hongyu luo Suhao Wang Zhou Chen Shuang Nie Changying Liu Jizhou Song Department of Engineering Mechanics Soft Matter Research Centerand Key Laboratory of Soft Machines and Smart Devices of Zhejiang ProvinceZhejiang UniversityHangzhou 310027People’s Republic of China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310027People’s Republic of China

Transfer printing based on switchable adhesive that heterogeneously integrates materials is essential to develop novel electronic systems,such as flexible electronics and micro LED ***,we report a robust design of a thermal actuated switchable dry adhesive,which features a stiff sphere embedded in a thermally responsive shape memory polymer(SMP)substrate and encapsulated by an elastomeric *** construct bypasses the unfavorable micro-and nano-fabrication processes and yields an adhesion switchability of over1000 by combining the peel-rate dependent effect of the elastomeric membrane and the thermal actuation of the sub-surface embedded stiff *** and numerical studies reveal the underlying thermal actuated mechanism and provide insights into the design and operation of the switchable *** of this concept in stamps for transfer printing of fragile objects,such as silicon wafers,silicon chips,and inorganic micro-LED chips,onto challenging non-adhesive surfaces illustrate its potential in heterogeneous material integration applications,such as flexible electronics manufacturing and deterministic assembly.

关键词： switchable adhesive reversible adhesive transfer printing flexible electronics

Switchable dry adhesive based on shape memory polymer with hemispherical indenters for transfer printing

在线全文

学校读者我要写书评

暂无评论

Theoretical & Applied Mechanics Letters 2021年第6期11卷 375-379页

作者： hongyu luo Chenglong Li Chuanqian Shi Shuang Nie Jizhou Song Department of Engineering Mechanics Soft Matter Research Centerand Key Laboratory of Soft Machines and Smart Devices of Zhejiang ProvinceZhejiang UniversityHangzhou 310027China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310027China

Transfer printing based on switchable adhesive is essential for developing unconventional systems,including flexible electronics,stretchable electronics,and micro light-emitting diode(LED)*** we report a design of switchable dry adhesive based on shape memory polymer(SMP)with hemispherical indenters,which offers a continuously tunable and reversible adhesion through the combination of the preloading effect and the thermal actuation of *** and numerical studies reveal the fundamental aspects of design,fabrication,and operation of the switchable dry *** of this adhesive concept in transfer printing of flat objects(e.g.,silicon wafers),three-dimensional(3D)objects(e.g.,stainless steel balls),and rough objects(e.g.,frosted glasses)in two-dimensional(2D)or 3D layouts illustrate its unusual manipulation capabilities in heterogeneous material integration applications.

关键词： Switchable dry adhesive Shape memory polymer Transfer printing

Widely tunable passively Q-switched Er3+-doped ZrF4 fiber laser in the range of 3.4–3.7 μm based on a Fe2+:ZnSe crystal

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2019年第9期7卷 1106-1111页

作者： hongyu luo JIAN YANG JIANFENG LI YONG LIU State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of China (UESTC)

We report the first(to the best of our knowledge) tunable passively Q-switched Er3+-doped ZrF4 fiber laser around 3.5 μm. In this case, a Fe2+:ZnSe crystal is used as the saturable absorber, and a plane-ruled grating in a Littrow configuration acts as the tuning element. At the tuned wavelength of 3478.0 nm, stable Q-switching with a maximum average power of 583.7 mW was achieved with a slope efficiency of 15.2% relative to the launched 1981 nm pump power. Further power scaling is mainly limited by the available 1981 nm pump power. The corresponding pulse width, repetition rate, and pulse energy are 1.18 μs, 71.43 kHz, and 7.54 μJ, respectively. By rotating the grating, the Q-switching can be continuously tuned in the region of 3.4–3.7 μm. To the best of our knowledge, this is the first pulsed rare-earth-doped fiber laser tunable in the region beyond 3.4 μm.

关键词： CW ZnSe crystal doped ZrF4 fiber laser in the range of 3.4 m based on a Fe Widely tunable passively Q-switched Er

Synergically improved energy storage performance and stability in sol–gel processed BaTiO_(3)/(Pb,La,Ca)TiO_(3)/BaTiO_(3) tri-layer films with a crystalline engineered sandwich structure

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2023年第12期12卷 2300-2314页

作者： Jinpeng Liu Ying Wang Hanfei Zhu hongyu luo Xiao Zhai Yu Huan Jing Yan Kun Wang Chao Liu Hongbo Cheng Jun Ouyang School of Chemistry and Chemical Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China School of Physics Shandong UniversityJinan 250100China School of Material Science and Engineering University of JinanJinan 250022China College of Physics and Electronic Engineering Qilu Normal UniversityJinan 250200China China Tobacco Shandong Industrial Co. Ltd.Jinan 250014China Key Laboratory of Key Film Materials&Application for Equipments(Hunan Province) Hunan Provincial Key Laboratory of Thin Film Materials and DevicesSchool of Material Sciences and EngineeringXiangtan UniversityXiangtan 411105China

Achieving an excellent energy storage performance,together with high cycling reliability,is desirable for expanding technological applications of ferroelectric ***,in well-crystallized ferroelectric materials,the concomitant high polarizability and low polarization saturation field have led to a square-shaped polarization–electric field loop,fatally impairing both recoverable energy density(W_(rec))and efficiency(η).Nanocrystalline ferroelectric films with a macroscopically amorphous structure have shown an improved W_(rec) andη,but their much lower polarizability demands an extremely high electric field to achieve such performances,which is undesirable from an economic ***,we propose a strategy to boost the energy storage performances and stability of ferroelectric capacitors simultaneously by constructing a tri-layer film in which a well-crystallized ferroelectric layer was sandwiched by two pseudo-linear dielectric layers with a dominant amorphous *** sol–gel-derived BaTiO_(3)/(Pb,La,Ca)TiO_(3)/BaTiO_(3)(BTO/PLCT/BTO)tri-layer films,we show that the above design is realized via rapid thermal annealing which fully crystallized the middle PLCT layer while left the top/bottom BTO cap layers in a poor crystallization *** sandwiched structure is endowed with an enhanced maximum polarization while a small remnant one and a much-delayed polarization saturation,which corresponds to large W_(rec)≈80 J/cm^(3) and highη≈86%.Furthermore,the film showed an outstanding cycling stability:its W_(rec) andηremain essentially unchanged after 10^(9) electric cycles(DW/W<4%,Dη/η<2%).These good energy storage characteristics have proved the effectiveness of our proposed strategy,paving a way for the utilization of sandwiched films in applications of electric power systems and advanced pulsed-discharge devices.

关键词： energy storage sandwich film amorphous structure nanocrystal cluster stability

Tunable antiferroelectric-like polarization behavior and enhanced energy storage characteristics in symmetric BaTiO_(3)/BiFeO_(3)/BaTiO_(3) heterostructure

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materiomics 2024年第6期10卷 1290-1298页

作者： Ying Wang Hanfei Zhu hongyu luo Jianting Li Yu Huan Yuyao Zhao Li Li Hongbo Cheng Chao Liu Qingguo Chi Jun Ouyang School of Chemistry and Chemical Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan250353China School of Mechanical Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan250353China Key Laboratory of Engineering Dielectrics and Its Application(Ministry of Education) Harbin University of Science and TechnologyHarbin150080China School of Material Science and Engineering University of JinanJinan250022China State Key Laboratory of Metal Matrix Composites School of Material Sciences and EngineeringShanghai Jiao Tong UniversityShanghai200240China Key Laboratory of Key Film Materials&Application for Equipments(Hunan Province) Hunan Provincial Key Laboratory of Thin Film Materials and DevicesSchool of Material Sciences and EngineeringXiangtan UniversityXiangtan411105China

The excellent energy storage performances of dielectric materials,a high energy density and efficiency,the stability in a wide range of temperature,frequency and cycling time,are surely desirable for the energy storage devices.A trade-off relationship between polarization and breakdown strength,however,limits the enhancement of energy storage properties of dielectric *** effectively boost the energy density and efficiency of dielectric capacitors,by inserting a BiFeO_(3) layer into the BaTiO_(3) film in present case,the symmetric BaTiO_(3)/BiFeO_(3)/BaTiO_(3) tri-layer film heterostructure with antiferroelectric-like characteristics was constructed based on the dual-interlayer coupling effect,what's more,its antiferroelectric-like characteristics will evolve with electric *** the tunable polarization behavior endows it with an enhanced maximum polarization but a reduced remnant one,a delayed saturation of polarization and a high breakdown strength,which are synergistically accountable for a large energy density(Wrec∼109 J/cm^(3))and a high efficiency(η∼82.6%),together with the good thermal(TR∼200℃,ΔWrec<3%&Δη<10%)and frequency(50 Hz–10 kHz,ΔWrec<7%&Δη<13%)stabilities,particularly an outstanding cycling reliability(10^(9) cycles,both ΔWrec and Δη<1%).Hence these findings can provide some innovative ideas for enriching the performance tuning of ferroelectrics,especially in enhancing their energy storage characteristics.

关键词： Antiferroelectric-like Tri-layer film heterostructure Tunable polarization behavior Interlayer coupling Energy storage