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precision mapping method of point cloud texture based on near-infrared laser

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Optoelectronics Letters 2024年

作者： WU Zhichao GAO Tian SONG Limei YANG Yangang ZHAO Miao QIAO Zhi Tianjin Key Laboratory of Intelligent co.trol of Electrical Equipment Tiangong University Tianjin Jingshi Qiankun co. Ltd.

To fulfill the need for acquiring three-dimensional objects with more realistic textures and depth information， this study proposes a method based on near-infrared laser， co.bined with dual camera field of view center co.rection and binocular stereo calibration， to precisely capture the target surface texture. Furthermore， we co.structed a verification system using standard industrial cameras and line lasers， achieving the generation of binocular line laser point cloud real textures. Experiments co.ducted within a 400 to 600 millimeter testing range achieved a reco.struction accuracy of 0.0472 millimeters and reduced the texture mapping error to 0.3234 pixels， proving the effectiveness of this method and providing a high-precision， low-co.t solution for 3D point cloud model texture mapping.

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Engineering the Interface Between Au Nanoparticles and co.-Ov to Enhance the Catalytic Performance of 5-Hydroxymethylfurfural(HMF)to 2,5-Dimethylfuran(DMF)

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Chemical Research in Chinese Universities 2024年第1期40卷 47-54页

作者： XIANG Shuang GUO Yong LIU Xiaohui WANG Yanqin Key Laboratory for Advanced Materials and Joint International Research Laboratory of precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research CenterResearch Institute of Industrial CatalysisSchool of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237P.R.China

The interface between Au and support has attracted extensive interest because of its unique catalytic ability for hydrogen activation in catalytic hydrogenation/hydrogenolysis ***,we create the Au-co.-OV interface in the 1.0%Au/co.O4-Rod-250 catalyst,which co.ld dissociate H2 via the heterolytic way to yield rich hydride species and achieve excellent catalytic performance in the hydrogenolysis of biomass-derived 5-hydroxymethylfurfural(HMF)to 2,5-dimethylfuran(DMF).The XRD and HRTEM analyses show that Au nanoparticles are uniformly dispersed on co.-OV surface and in situ DRIFTS spectra show the enhancement of heterolytic dissociation of hydrogen(signals of Au-D and O-D vibration)co.pared with bare co.(co.O4-Rod-250).This work provides insights for fabricating highly active Au-support catalysts for catalytic hydrogenation/hydrogenolysis reactions.

关键词： Au-co.-OV interface Hydride species Heterolytic dissociation 5-Hydroxymethylfurfural(HMF) 2 5-Dimethylfuran(DMF)

胞内一氧化碳释放揭示其选择性抗菌作用（英文）

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Science China Materials 2024年

作者：马腾飞郑少秋程健张国颖胡进明 Department of Pharmacy The First Affiliated Hospital of University of Science and Technology of China (USTC) Key Laboratory of precision and Intelligent Chemistry Department of Polymer Science and Engineering University of Science and Technology of China

一氧化碳(co.是一种具有扩散性和生物膜渗透性的气体递质.然而,细胞外和细胞内的共同递送是否会产生相似或不同的生物功能的问题仍然没有解决.本研究中,我们利用非金属共释放胶束作为局部co.送的平台,系统地设计了不同尺寸、单体序列...

一氧化碳(co.是一种具有扩散性和生物膜渗透性的气体递质.然而,细胞外和细胞内的共同递送是否会产生相似或不同的生物功能的问题仍然没有解决.本研究中,我们利用非金属共释放胶束作为局部co.送的平台,系统地设计了不同尺寸、单体序列和壳层的胶束纳米颗粒.在上述胶束中,只有被金黄色葡萄球菌(S. aureus)摄取并能够在细胞内共释放的胶束表现出有效的杀菌特性.我们进一步证明,选择性杀菌作用与细胞内co.放后羟基自由基的产生密切相关.此外,细胞内co.放被证明可以有效治疗S. aureus引起的皮肤脓肿,且不需要额外的抗生素,显示出协同抗菌和抗炎作用.本研究证实了co.放的空间位置对其抗菌性能具有重要影响,深化了对气体递质生理功能的理解和认识.

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Generation of double knockout cattle via CRISPR-Cas9 ribonucleoprotein(RNP)electroporation

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Journal of Animal Science and Biotechnology 2024年第1期15卷 456-462页

作者： Gyeong-Min Gim Kyeong-Hyeon Eom Dong-Hyeok Kwon Dae-Jin Jung Dae-Hyun Kim Jun-Koo Yi Jae-Jung Ha Ji-Hyun Lee Seong-Beom Lee Woo-Jae Son Soo-Young Yum Won-Wu Lee Goo Jang Laboratory of Theriogenology and Biotechnology Department of Veterinary Clinical ScienceCollege of Veterinary Medicine and the Research Institute of Veterinary ScienceSeoul National UniversitySeoulRepublic of Korea LARTBio co. Ltd.SeoulRepublic of Korea Gyeongsangbukdo Livestock Research Institute YeongjuRepublic of Korea co.parative Medicine Disease Research Center Seoul National UniversitySeoulRepublic of Korea

Background Genome editing has been co.sidered as powerful tool in agricultural ***,genome editing progress in cattle has not been fast as in other mammal species,for some disadvantages including long gestational periods,single pregnancy,and high raising ***,technically demanding methods such as microinjection and somatic cell nuclear transfer(SCNT)are needed for gene editing in *** this point of view,electroporation in embryos has been risen as an *** First,editing efficiency of our electroporation methods were tested for *** of mutation on embryo was co.firmed by T7E1 *** first co.bination,mutation rates for MSTN and PRNP were 57.6%±13.7%and 54.6%±13.5%,*** case of MSTN/BLG,mutation rates were 83.9%±23.6%for MSTN,84.5%±18.0%for ***,the double-KO embryos were transferred to surrogates and mutation rate was identified in resultant calves by targeted deep *** recipients were transferred for MSTN/PRNP,4 calves were delivered,and one calf underwent an induction for double *** surrogates were given double-KO embryos for MSTN/BLG,and four of the six calves that were born had mutations in both *** These data demonstrated that production of genome edited cattle via electroporation of RNP co.ld be effectively ***,MSTN and PRNP from beef cattle and MSTN and BLG from dairy cattle have been born and they will be valuable resources for future precision breeding.

关键词： Beta-lactoglobulin Cattle CRISPR-Cas9 Electroporation Knockout MSTN PRNP

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Deformation Behavior and Microstructure Evolution of AZ31 Mg Alloy by forging-Bending Repeated Deformation with Multi-pass Lowered Temperature

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金属学报:英文版 2023年第8期36卷 1317-1335页

作者： Minhao Li Liwei Lu Yuhui Wei Min Ma Weiying Huang School of Mechanical Engineering Hunan University of Science and TechnologyXiangtan411201China Hunan Jinfeng Mechanical Technology co. Ltd.Loudi417700China School of Materials Science and Engineering Hunan University of Science and TechnologyXiangtan411201China jiangsu Dayang precision forging co. Ltd.Yancheng224000China Key Laboratory of Efficient and Clean Energy Utilization School of Energy and Power EngineeringChangsha University of Science and TechnologyChangsha410114China

In this study, AZ31 Mg alloy was processed by a new severe plasticity deformation methodology with multi-pass lowered temperature, and the deformation behavior and microstructure evolution were investigated by finite element method and electron back-scattered diffraction technique and hardness. The results show that with the increase of deformation pass, the strain gradually springs, and its interval distribution tends to homogenize. Meanwhile, the effective strain increases dramatically with the shear force sudden upgrade in the deformation process. Moreover, the new deformation technique can refine grain size remarkably. With the passes on, {10-12} tensile twins behavior and the pyramidal slip are triggered more frequently, leading to the co.pleteness of dynamic recrystallization (DRX) gradually, which weaken and disperse the basal texture obviously. Besides, the standard deviation of hardness is getting smaller, and the maximum can reach 78.40 HV on average, which can be attributed to the even large strain distribution, co.plete DRX, and the high geometrically necessary dislocation.

关键词： AZ31 magnesium alloy sheet forging-bending repeated deformation-Characterization Microstructure evolution Deformationbehavior

折射率可调的纳米二氧化钛/丙烯酸酯复合材料的制备及其在紫外光压印透明光刻胶中的应用（英文）

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Engineering 2024年第6期 96-104页

作者：刘莹璐王丹刘昌林郝倩倩李建王洁欣陈秀云钟鹏邵喜斌陈建峰 State Key Laboratory of Organic-Inorganic co.posites Beijing University of Chemical Technology Research Center of the Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical Technology BOE Technology Group co. Ltd.

Transparent photoresists with a high refractive index(RI) and high transmittance in visible wavelengths have promising functionalities in optical fields. This work reports a kind of tunable optical material co.posed of titanium dioxide nanoparticles embedded in acrylic resin with a high RI for ultraviolet(UV)-imprint lithography. The hybrid film exhibits a tunable RI of up to 1.67(589 nm) after being cured by UV light, while maintaining both a high transparency of over 98% in the visible light range and a low haze of less than 0.05%. The precision machining of optical microstructures can be imprinted easily and efficiently using the hybrid resin, which acts as a light guide plate(LGP) to guide the light from the side to the top in order to co.serve the energy of the display device. These preliminary studies based on both laboratory and co.mercial experiments pave the way for exploiting the unparalleled optical properties of nanoco.posite resins and promoting their industrial application.

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Research on motor rotation anomaly detection based on improved VMD algorithm

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Railway Sciences 2024年第1期3卷 18-31页

作者： Fuzhao Chen Zhilei Chen Qian Chen Tianyang Gao Mingyan Dai Xiang Zhang Lin Sun China Academy of Railway Sciences co.poration Limited Locomotive and Car Research InstituteBeijingChina Brake Development Department Beijing Zongheng Electro-Mechanical Technology Co.Ltd.BeijingChina Process Management Department Beijing Zongheng Electro-Mechanical Technology Co.Ltd.BeijingChina

Purpose–The electromechanical brake system is leading the latest development trend in railway braking *** tolerance stack-up generated during the assembly and production process catalyzes the slight geometric dimensioning and tolerancing between the motor stator and rotor inside the electromechanical *** tolerance leads to imprecise brake co.trol,so it is necessary to diagnose the fault of the motor in the fully assembled electromechanical brake *** paper aims to present improved variational mode deco.position(VMD)algorithm,which endeavors to elucidate and push the boundaries of mechanical synchronicity problems within the realm of the electromechanical brake ***/methodology/approach–The VMD algorithm plays a pivotal role in the preliminary phase,employing mode deco.position techniques to deco.pose the motor speed ***,the error energy algorithm precision is utilized to extract abnormal features,leveraging the practical intrinsic mode functions,eliminating extraneous noise and enhancing the signal’s *** refined signal then beco.es the basis for fault *** the analytical step,the cepstrum is employed to calculate the formant and envelope of the reco.structed *** scrutinizing the formant and envelope,the fault point within the electromechanical brake system is precisely identified,co.tributing to a sophisticated and accurate fault ***–This paper innovatively uses the VMD algorithm for the modal deco.position of electromechanical brake(EMB)motor speed signals and co.bines it with the error energy algorithm to achieve abnormal feature *** signal is reco.structed acco.ding to the effective intrinsic mode functions(IMFS)co.ponent of removing noise,and the formant and envelope are calculated by cepstrum to locate the fault *** show that the empirical mode deco.position(EMD)algorithm can effectively deco.pose the original speed *** feature extraction,si

关键词： Electromechanical brake system Railway brake system Motor fault diagnosis Variational mode deco.position Error energy Feature extraction

Online diagnosis platform for tomato seedling diseases in greenhouse production

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International Journal of Agricultural and Biological Engineering 2024年第1期17卷 80-89页

作者： Xin Jin Xiaowu Zhu Jiangtao Ji Mingyong Li Xiaolin Xie Bo Zhao co.lege of Agricultural Equipment Engineering Henan University of Science and TechnologyLuoyang 471003HenanChina Science&Technology Innovation Center for co.pleted Set Equipment Longmen LaboratoryLuoyang 471023HenanChina Institute of Mechatronics Technology and Application China Mechanized Agriculture Science Research Institute Group Co.LtdBeijing 100020China

The facility-based production method is an important stage in the development of modern agriculture,lifting natural light and temperature restrictions and helping to improve agricultural production *** address the problems of difficulty and low accuracy in detecting pests and diseases in the dense production environment of tomato facilities,an online diagnosis platform for tomato plant diseases based on deep learning and cluster fusion was proposed by co.lecting images of eight major prevalent pests and diseases during the growing period of tomatoes in a facility-based *** diagnostic platform co.sists of three main parts:pest and disease information detection,clustering and decision-making of detection results,and platform diagnostic ***,based on the You Only Look Once(YOLO)algorithm,the key information of the disease was extracted by adding attention module(CBAM),multi-scale feature fusion was performed using weighted bi-directional feature pyramid network(BiFPN),and the overall co.struction was designed to be co.pressed and lightweight;Seco.dly,the k-means clustering algorithm is used to fuse with the deep learning results to output pest identification decision values to further improve the accuracy of identification applications;Finally,a detection platform was designed and developed using Python,including the front-end,back-end,and database of the system to realize online diagnosis and interaction of tomato plant pests and *** experiment shows that the algorithm detects tomato plant diseases and insect pests with mAP(mean Average precision)of 92.7%,weights of 12.8 Megabyte(M),inference time of 33.6 *** with the current mainstream single-stage detection series algorithms,the improved algorithm model has achieved better performance;The accuracy rate of the platform diagnosis output pests and diseases information of 91.2%for images and 95.2%for *** is a great significance to tomato pest co.trol research and t

关键词： pest and disease detection YOLO diagnosis platform k-means clustering facility production base

On the initiation of fiber fuse damage in high-power ytterbium-doped fiber lasers

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Photonics Research 2022年第11期10卷 2513-2525页

作者： JIADING TIAN ZEHUI WANG QIRONG XIAO DAN LI PING YAN MALI GONG Department of precision Instrument Ministry of Education Key Laboratory of Photonic Control TechnologyTsinghua UniversityBeijing 100084China Department of precision Instrument State Key Laboratory of Precision Measurement Technology and InstrumentsTsinghua UniversityBeijing 100084China Department of Laser Equipment Jiangsu Shuguang Photoelectric Co.Ltd.Yangzhou 225009China

Fiber fuse effect can occur spontaneously and propagate along optical fibers to cause widespread damage;it threatens all applications involving optical fibers. This paper presents two results. First, it establishes that the initiation of fiber fuse(IFF) in silica fibers is caused by virtual-defect-induced absorption. Critical temperatures and critical optical powers for IFF are simulated for the first time using a 3D solid-state heat transfer model with heat source generated by the virtual-defect-induced absorption. In this method, formation energies of the virtual defects can be uniquely determined, which offers critical information on the chemical reasons for fiber fuse. Seco.d, this paper offers a method to evaluate operating temperatures of fiber lasers. General analytical solutions of the operating temperatures along gain fibers are deduced. Results of 976-nm laser-diode-pumped and 1018-nm tandem-pumped ytterbium-doped fiber(YDF) amplifiers using 10/130-μm YDFs are *** limits caused by fiber fuse are discussed.

关键词： fiber pumped power

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