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multispectral point cloud superpoint segmentation

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Science China(Technological Sciences) 2024年第4期67卷 1270-1281页

作者： wang Qingwang wang m.ngYe ZHAng ZiFeng song Jian ZEng Kai SHEN Tao GU YanFeng Faculty of Information Engineering and Automation Kunming University of Science and TechnologyKunming 650500China Yunnan Key Laboratory of Computer Technologies Application Kunming 650500China School of Electronics and Information Engineering Harbin Institute of TechnologyHarbin 150001China

The multitude of airborne point clouds limits the point cloud processing *** are grouped based on similar points,which can effectively alleviate the demand for computing resources and improve processing ***,existing superpoint segmentation methods focus only on local geometric structures,resulting in inconsistent spectral features of points within a *** feature inconsistencies degrade the performance of subsequent ***,this study proposes a novel Superpoint Segmentation method that jointly utilizes spatial Geometric and Spectral Information for multispectral point cloud superpoint segmentation(GSI-SS).Specifically,a similarity metric that combines spatial geometry and spectral information is proposed to facilitate the consistency of geometric structures and object attributes within segmented *** the formation of the primary superpoints,an intersuperpoint pointexchange mechanism that maximizes feature consistency within the final superpoints is *** are conducted on two real multispectral point cloud datasets,and the proposed method achieved higher recall,precision,F score,and lower global consistency and feature classification *** experimental results demonstrate the superiority of the proposed GSI-SS over several state-of-the-art methods.

关键词： multispectral point cloud superpoint segmentation over-segmentation spatial-spectral joint metric

Room-temperature hydrogen adsorption in Pd nanoparticle decorated UiO-66-NH2 via spillover

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PARTICUOLOGY 2024年第10期93卷 309-315页

作者： wang, Jingchuan Luo, Junhong Yao, Yong song, Jiangfeng Shi, Yan China Acad Engn Phys Inst Mat Jiangyou 621908 Peoples R China

To improve room-temperature hydrogen storage, palladium (Pd) nanoparticles were innovatively decorated by carbon bridge onto the amino-group functioned Zr-terephthalate metal-organic framework (mOF) UiO-6 6 to reduce the diffusion energy barrier and then improve the hydrogen spillover effect. Powder X-ray diffraction shows broad Pd peak and retained UiO-66-NH2 2 integrity after Pd decoration. The hydrogen uptake capacity show that UiO-66-NH2-Pd 2-Pd exhibits best hydrogen storage performance than UiO-66-NH2 2 and pristine UiO-66. The hydrogen up taken in Pd decorated UiO-6 6 (UiO-66-NH2-1Pd) 2-1Pd) was close to 4 wt% under 20 mPa at room temperature. Density functional theory (DFT) calculations show that hydrogen adsorption energy of UiO-66-NH2-Pd 2-Pd was-0.5897 eV, which was much lower than that of UiO-66-NH2 2 (-0.3716 eV) and UiO-6 6 (-0.2975 eV). Ultimately, Pd decorated NH2 2 group functioned UiO-6 6 enable improve storage capacities through hydrogen spillover under ambient conditions which could satisfy the demand for sustainable energy, especially for the long-term storage energy media. (c) 2024 Published by Elsevier B.V. on behalf of Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences.

关键词： Hydrogen storage UiO-66-NH 2 Pd decorated Spillover mETAL-ORGANIC FRAmEWORKS STORAGE

Cross-modal Graph Semantic Communication Assisted by Generative AI in the metaverse for 6G

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Research 2024年第2期2024卷 19-27页

作者： m.ngkai Chen m.nghao Liu Congyan wang Xingnuo song Zhe Zhang Yannan Xie Lei wang Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and TelecommunicationsNanjng 210003China State Key Laboratory of Organic Electronics and Information Displays&Institute of Advanced materials(IAm) Nanjing University of Posts and TelecommunicationsNanjing 210023China

Recently, the development of the metaverse has become a frontier spotlight, which is an important demonstration of the integration innovation of advanced technologies in the Internet. moreover, artificial intelligence (AI) and 6G communications will be widely used in our daily lives. However, the effective interactions with the representations of multimodal data am.ng users via 6G communications is the main challenge in the metaverse. In this work, we introduce an intelligent cross-modal graph semantic communication approach based on generative AI and 3-dimensional (3D) point clouds to improve the diversity of multimodal representations in the metaverse. Using a graph neural network, multimodal data can be recorded by key semantic features related to the real scenarios. Then, we compress the semantic features using a graph transformer encoder at the transmitter, which can extract the semantic representations through the cross-modal attention mechanisms. Next, we leverage a graph semantic validation mechanism to guarantee the exactness of the overall data at the receiver. Furthermore, we adopt generative AI to regenerate multimodal data in virtual scenarios. Simultaneously, a novel 3D generative reconstruction network is constructed from the 3D point clouds, which can transfer the data from images to 3D models, and we infer the multimodal data into the 3D models to increase realism in virtual scenarios. Finally, the experiment results demonstrate that cross-modal graph semantic communication, assisted by generative AI, has substantial potential for enhancing user interactions in the 6G communications and metaverse.

关键词： modal frontier guarantee

Global Spherically Symmetric Solutions for a Coupled Compressible Navier–Stokes/Allen–Cahn System

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Acta mathematica Sinica,English Series 2024年第8期40卷 2037-2064页

作者： Chang m.ng song Jian Lin ZHAng Yuan Yuan wang Department of Applied mathematics School of Mathematics and Information ScienceZhongyuan University of TechnologyZhengzhou 450007P.R.China

In this paper,we consider the global spherically symmetric solutions for the initial boundary value problem of a coupled compressible Navier–Stokes/Allen–Cahn system which describes the motion of two-phase viscous compressible *** prove the existence and uniqueness of global classical solution,weak solution and strong solution under the assumption of spherically symmetry condition for initial dataρ0 without vacuum state.

关键词： Diffuse interface model global solutions Navier-Stokes equations Allen-Cahn equation spherically symmetry

A review of the development of asphalt foam.ng technology

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Journal of Road Engineering 2024年第3期4卷 334-347页

作者： Qiang Li Shijie song Jiaqing wang Ning wang Shuai Zhang College of Civil Engineering Nanjing Forestry UniversityNanjing 210037China Jiangsu Zhongxing maintainance Co. Ltd.Nantong 226015China

To comprehensively assess the current state-of-art in asphalt foam.ng technology, the following four key aspectshave been reviewed systematically: foam.ng principles, test methods, evaluation indicators, and influencing *** findings reveal that asphalt foam.ng was primarily driven by the vaporization of water, with deteriorationprocesses including bubble collapse and liquid film drainage. However, the current understanding of asphaltfoam.ng principles remains limited, primarily due to difficulties in capturing and precisely measuring its microscopic behaviors during asphalt foam.ng process. Volume changes provided an intuitive means to evaluate theexpansion capacity of asphalt and its foam.ng stability. Bubble evolution characteristics of foamed asphalt offeredpromising insights into its foam.ng performance. Traditional ruler and stopwatch-based assessments were beingsuperseded by automated techniques like laser and ultrasonic ranging. Nevertheless, the current measuringequipment still lacks the capability to comprehensively evaluate the foam.ng effect of asphalt across various dimensions. Asphalt temperature and foam.ng water consumption significantly affected asphalt foam.ng performance, and the inclusion of foam.ng agents typically led to a notable increase in the half life of foamed ***, the interaction between foam.ng agents and asphalt, as well as the underlying mechanisms affecting thefoam.ng effect, are still unclear and require further exploration. Future research should primarily focus on thecorrelation between asphalt foam.ng effect and mixture performance, aim.ng to guide the practical engineeringapplication of foamed asphalt mixtures and enlarge the advantages of such low-emission and sustainable mixtures.

关键词： Foamed asphalt Foam.ng mechanism Test methods Evaluation indicators Influencing factors

The variation in basal channels and basal melt rates of Pine Island Ice Shelf

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Acta Oceanologica Sinica 2024年第1期43卷 22-34页

作者： m.ngliang Liu Zemin wang Baojun Zhang Xiangyu song Jiachun An Chinese Antarctic Center of Surveying and mapping Wuhan UniversityWuhan 430079China Key Laboratory of Polar Environment monitoring and Public Governance(Wuhan University) Ministry of EducationWuhan 430079China School of Civil Engineering Shijiazhuang Tiedao UniversityShijiazhuang 050043China Key Laboratory of Roads and Railway Engineering Safety Control(Shijiazhuang Tiedao University) Ministry of EducationShijiazhuang 050043China

In recent years,there has been a significant acceleration in the thinning,calving and retreat of the Pine Island Ice Shelf(PIIS).The basal channels,results of enhanced basal melting,have the potential to significantly impact the stability of the *** this study,we used a variety of remote sensing data,including Landsat,REmA DEm,ICESat-1 and ICESat-2 satellite altimetry observations,and Ice Bridge airborne measurements,to study the spatiotemporal changes in the basal channels from 2003 to 2020 and basal melt rate from 2010 to 2017 of the PIIS under the Eulerian *** found that the basal channels are highly developed in the PIIS,with a total length exceeding 450 *** of the basal channels are ocean-sourced or groundingline-sourced basal channels,caused by the rapid melting under the ice shelf or near the groundingline.A raised seabed prevented warm water intrusion into the eastern branch of the PIIS,resulting in a lower basal melt rate in that *** contrast,a deepsea trough facilitates warm seawater into the mainstream and the western branch of the PIIS,resulting in a higher basal melt rate in the main-stream,and the surface elevation changes above the basal channels of the mainstream and western branch are more *** El Ni?o event in 2015–2016 possibly slowed down the basal melting of the PIIS by modulating wind field,surface sea temperature and depth seawater *** and atmospheric changes were driven by El Ni?o,which can further explain and confirm the changes in the basal melting of the PIIS.

关键词： Pine Island Ice Shelf basal channel basal melt rate digital elevation models(DEms) satellite altimetry

Double-layered skeleton of Li alloy anchored on 3D metal foam enabling ultralong lifespan of Li anode under high rate

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Chinese Chemical Letters 2024年第3期35卷 479-485页

作者： Chaohui Wei Zeyu Yao Jin Ruan Zhicui song Aijun Zhou Yingze song Donghuang wang Jicheng Jiang Xin wang Jingze Li Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou 313000China School of materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China State Key Laboratory of Environmental-Friendly Energy materials Tianfu Institute of Research and InnovationSchool of Materials and ChemistrySouthwest University of Science and TechnologyMianyang 621010China

The high specific capacity and low negative electrochemical potential of lithium metal anodes(LmAs),may allow the energy density threshold of Li metal batteries(LmBs)to be pushed ***,the existing detrimental issues,such as dendritic growth and volume expansion,have hindered the practical implementation of *** three-dimensional frameworks(e.g.,copper and nickel foam),have been regarded as one of the fundamental strategies to reduce the local current density,aim.ng to extend the Sand'***,the local environment far from the skeleton is almost the same as the typical plane Li,due to macroporous space of metal ***,we built a double-layered 3D current collector of Li alloy anchored on the metal foam,with micropores interconnected macropores,via a viable thermal infiltration and cooling *** to the excellent electronic and ionic conductivity coupled with favorable lithiophilicity,the Li alloy can effectively reduce the nucleation barrier and enhance the Li^(+)transportation rate,while the metal foam can role as the primary promotor to enlarge the surface area and buffer the dimensional ***,the Li composite anode with hierarchical structure of primary and secondary scaffolds realized the even deposition behavior and minimum volume expansion,outputting preeminent prolonged cycling performances under high rate.

关键词： Double-layered skeleton Li alloy 3D metal foam Ultralong lifespan Lithium metal batteries High rate

The First Ground-based White Light Lunar Polarization Imaging:A New Kind of FeO Observation on the Near Side of the moon

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Research in Astronomy and Astrophysics 2024年第6期24卷 1-6页

作者： Wei-Nan wang Jin-song Ping m.ng-Yuan wang Wen-Zhao Zhang Han-Lin Ye Xing-Wei Han song-Feng Kou Changchun Observatory National Astronomical ObservatoriesChinese Academy of SciencesChangchun 130117China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 101408China Astronomy Department Beijing Normal UniversityBeijing 100875China International Center for Climate and Environment Sciences Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Nanjing Institute of Astronomical Optics and Technology Chinese Academy of SciencesNanjing 210042China

Lunar optical polarization is a fascinating phenomenon that occurs when sunlight reflects off the surface of the moon and becomes *** study employs a novel split-focus plane polarimetric camera to conduct the initial white light polarimetric observations on the near side of the *** obtained the linear degree of polarization(DOP)parameters of white light by observation from the eastern and western hemispheres of the *** findings indicate that the white light polarization is lower in the lunar highland than in the lunar maria *** the analysis of lunar soil samples,we noticed and determined that the DOP parameters of white light demonstrate high consistency with iron oxide on the *** study may serve as a new diagnostic tool for the moon.

关键词： techniques:photometric polarization methods:observational moon

Flexible polydimethylsiloxane pressure sensor with micro-pyramid structures and embedded silver nanowires:A novel application in urinary flow measurement

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Nanotechnology and Precision Engineering 2024年第3期7卷 1-12页

作者： Ben-song wang Ang Gao song-Wei Huang Qi-Hong Ning Cheng Zhou Qi-Xiang song Da-XiangCui School of Electronic Information and Electrical Engineering Shanghai Jiao Tong UniversityShanghai 200240China Department of Urology Renji HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai 200240China

Flexible pressure sensors are lightweight and highly sensitive,making them suitable for use in small portable devices to achieve precise measurements of tiny *** article introduces a low-cost and easy-fabrication strategy for piezoresistive flexible pressure *** embedding silver nanowires into a polydimethylsiloxane layer with micro-pyramids on its surface,a flexible pressure sensor is created that can detect low pressure (17.3 Pa) with fast response (ms) and high sensitivity (69.6 mA kPa-1).Furthermore,the pressure sensor exhibits a sensitive and stable response to a small amount of water flowing on its *** this basis,the flexible pressure sensor is innovatively combined with a micro-rotor to fabricate a novel urinary flow-rate meter (uroflowmeter),and results from a simulated human urination experiment show that the uroflowmeter accurately captured all the essential shape characteristics that were present in the pump-simulated urination *** ahead,this research provides a new reference for using flexible pressure sensors in urinary flow-rate monitoring.

关键词： Flexible pressure sensor Silver nanowires Portable device Uroﬂowmeter Healthcare