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Effects of laser energy on the surface quality and properties of electrodeposited zinc-nickel-molybdenum coatings

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Nanotechnology and Precision Engineering 2023年第3期6卷 18-26页

作者： tao ni Zhaoyang Zhang Yucheng Wu Shuai Yang Laser Technology Institute School of Mechanical EngineeringJiangsu UniversityZhenjiang 212013China

As a substitute for toxic cadmium coatings in the aerospace industry,zinc-nickel coatings have excellent application prospects,and their properties can be improved by adding *** this study,laser-assisted electrodeposition is used to improve the surface quality and properties of Zn–ni–Mo coatings,with investigation of how laser energy in the range of 0–21.1μJ affects their element content,surface morphology,crystal phase,microhardness,residual internal stress,and corrosion *** laser irradiation accelerates the electrodeposition,refines the grain size,improves the hydrogen adsorption,and reduces the residual tensile stress,and a laser energy of 15.4μJ gives the highest ni and Mo contents and the lowest Zn content,as well as the optimum surface morphology,microhardness,residual internal stress,and corrosion resistance of the coating.

关键词： Electrodeposition Laser energy Zn-ni-Mo Surface quality Properties

Catalytic asymmetric dipolar cycloadditions of indolyl delocalized metal-allyl species for the enantioselective synthesis of cyclopenta[b]indoles and pyrrolo[1,2-α]indoles

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Science China Chemistry 2021年第1期64卷 34-40页

作者： Fei Tian Wu-Lin Yang tao ni Jian Zhang Wei-Ping Deng Shanghai Key Laboratory of New Drug Design and School of Pharmacy East China University of Science and TechnologyShanghai 200237China

The development of novel synthons and efficient methods to synthesize chiral polycyclic indoles has been a hot topic in organic synthesis and medicinal chemistry owing to their broad applications in medicines,pesticides,and other functional ***,we disclosed novel indolyl substituted metal-allyl zwitterionic intermediates through the decarboxylation of conveniently available vinyl indoloxazolidones,which could be regarded as two types of dipolar species through the anionic *** palladium-π-allyl species tended to serve as an all-carbon 1,3-dipole in the asymmetric[3+2]cycloaddition with electrondeficient alkenes,which furnished polysubstituted cyclopenta[b]indoles with high regio-and ***,the iridium-π-allyl species was recognized as an aza-1,3-dipole in asymmetric[3+2]cycloaddition with in situ generated C1 ammonium enolates,affording pyrrolo[1,2-α]indoles with high diastereo-and *** addition,the dipolar cycloadditions could be easily scaled-up and several synthetic transformations of the cycloadducts were demonstrated for the rapid synthesis of diverse chiral polycyclic indoles.

关键词： palladium catalysis iridium catalysis asymmetric synthesis dipolar cycloaddition polycyclic indoles

Emma:An accurate,efficient,and multi-modality strategy for autonomous vehicle angle prediction

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Intelligent and Converged Networks 2023年第1期4卷 41-49页

作者： Keqi Song tao ni Linqi Song Weitao Xu Shenzhen Research Institute City University of Hong KongHong KongChinaand also with the Department of Computer ScienceCity University of Hong KongHong KongChina

Autonomous driving and self-driving vehicles have become the most popular selection for customers for their *** angle prediction is one of the most prevalent topics in the autonomous driving industry,that is,realizing real-time vehicle angle ***,existing methods of vehicle angle prediction utilize only single-modal data to achieve model prediction,such as images captured by the camera,which limits the performance and efficiency of the prediction *** this paper,we present Emma,a novel vehicle angle prediction strategy that achieves multi-modal prediction and is more ***,Emma exploits both images and inertial measurement unit(IMU)signals with a fusion network for multi-modal data fusion and vehicle angle ***,we design and implement a few-shot learning module in Emma for fast domain adaptation to varied scenarios(e.g.,different vehicle models).Evaluation results demonstrate that Emma achieves overall 97.5%accuracy in predicting three vehicle angle parameters(yaw,pitch,and roll),which outperforms traditional single-modalities by approximately 16.7%-36.8%.Additionally,the few-shot learning module presents promising adaptive ability and shows overall 79.8%and 88.3%accuracy in 5-shot and 10-shot settings,***,empirical results show that Emma reduces energy consumption by 39.7%when running on the Arduino UNO board.

关键词： multi-modality autonomous driving vehicle angle prediction few-shot learning

Modeling and analysis of landing collision dynamics for a shipborne helicopter

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Frontiers of Mechanical Engineering 2021年第1期16卷 151-162页

作者： Dingxuan ZHAO Haojie YANG Carbone GIUSEPPE Wenhang LI tao ni Shuangji YAO School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China Department of Mechanical Energy and Management EngineeringUniversity of CalabriaDiMEGRende 87036Italy School of Mechanical and Aerospace Engineering Jilin UniversityChangchun 130022China School of Vehicles and Energy Yanshan UniversityQinhuangdao 066004China

A Lagrange dynamic model is established based on small-angle approximation to improve the simulation model for shipborne helicopter landing *** describe fuselage motion effectively,the proposed model considers ship motion,the interaction of the tires with the deck,and tire slippage.A mechanism of sliding motion is built,and a real-time reliability analysis of the algorithm is implemented to validate the proposed *** simulations are also conducted under different operation *** show that the proposed dynamic model can simulate the collision motion of helicopter landing in real *** suggestions for helicopter pilot landing are likewise provided.

关键词： shipborne helicopter landing model Lagrange equations dynamics validation

Spectrum Sensing via Temporal Convolutional Network

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China Communications 2021年第9期18卷 37-47页

作者： tao ni Xiaojin Ding Yunfeng Wang Jun Shen Lifeng Jiang Gengxin Zhang Telecommunication and Networks National Engineering Research Center(Nanjing University of Posts and Telecommunications) Nanjing 210003China Xi’an Institute of Space Radio Techonology Xi’an 710000China

In this paper,we investigate a spectrumsensing system in the presence of a satellite,where the satellite works as a sensing *** the conventional energy detection method is sensitive to the noise uncertainty,thus,a temporal convolutional network(TCN)based spectrum-sensing method is designed to eliminate the effect of the noise uncertainty and improve the performance of spectrum sensing,relying on the offline training and the online detection ***,in the offline training stage,spectrum data captured by the satellite is sent to the TCN deployed on the gateway for training ***,in the online detection stage,the well trained TCN is utilized to perform real-time spectrum sensing,which can upgrade spectrum-sensing performance by exploiting the temporal ***,simulation results demonstrate that the proposed method achieves a higher probability of detection than that of the conventional energy detection(ED),the convolutional neural network(CNN),and deep neural network(DNN).Furthermore,the proposed method outperforms the CNN and the DNN in terms of a lower computational complexity.

关键词： cognitive radio spectrum sensing deep learning temporal convolutional network satellite communication

BOP shear force evaluation under complex scenarios

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Petroleum Science 2023年第4期20卷 2442-2451页

作者： Feng-Li Zhang Jin-tao ni Lai-Bin Zhang Yong-Sheng Chen Jin-Jiang Wang School of Mechanical and Transportation Engineering China University of PetroleumBeijing102249China School of Safety and Ocean Engineering China University of PetroleumBeijing102249China Key Laboratory of Oil and Gas Production Safety and Emergency Technology Ministry of Emergency ManagementBeijing102249China

As the“throat”of the drilling well control system,ram blowout preventers(BOPs)can effectively prevent blowout ***,the ram shear mechanism under complex working conditions is unclear,and it is difficult to evaluate the ram BOP shear force,leading to frequent shear failure accidents in *** at the above problems,this paper takes the double-V ram BOP as the research object,and integrates the methods of theoretical analysis,simulation modeling,and test verification to analyze the shear force in the pipe shear process under both static and moving conditions.A ram BOP shear force evaluation method is proposed based on equivalent ***,by comparing with calculation data and experimental data,the error between them is less than 5%,demonstrating the applicability and effectiveness of the proposed *** research results can provide a theoretical basis for oilfield operations of ram BOPs.

关键词： Double-V ram Blowout preventer Shear force assessment Moving state shearing Finite element analysis Shear test under pressure

Resolution of DL-Pantolactone with Ethyldiamine Bridged Dimer Permethyβ-Cyclodextrin as GC Stationary Phase

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Chinese Chemical Letters 2001年第5期12卷 447-448页

作者： Dan ni tao Xue Yan SHI Jun Ling GU Ruo Nong FU College of Chemical Engineering and Materials Science Beijing Institute of TechnologyBeijing 100081 Department of Application Chemistry Chinese Agriculture UniversityBeijing 100094

Ethyldiamine bridged dimer permethy-β-CD and other cyclodextrins were used as GC stationary phase to resolute DL-pantolactone. It is found that this CD dimer has a good selectivity for DL-pantolactone.

关键词： Cyclodextrin dimer gas chromatography stationary phase.

Meso-Cenozoic Tectonothermal History of Permian Strata, Southwestern Weibei Uplift: Insights from Thermochronology and Geothermometry

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Acta Geologica Sinica(English Edition) 2019年第6期93卷 1647-1661页

作者： YU Qiang REN Zhanli LI Rongxi tao ni QI Kai JIANG Cheng WANG Baojiang The School of Earth Science and Resources Chang’an UniversityXi’an 710054China Key Laboratory of Western China's Mineral Resources and Geological Engineering Ministry of EducationChang'an UniversityXi'an 710054China State Key Laboratory of Continental Dynamics Northwest UniversityXi'an 710069China Department of Geology Northwest UniversityXi’an710069China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400030China State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam Chongqing UniversityChongqing 400030China Research Institute of Yanchang Petroleum(Group)Company Limited Xi’anSichuan710075China

This study provides an integrated interpretation for the Mesozoic-Cenozoic tectonothermal evolutionary history of the Permian strata in the Qishan area of the southwestern Weibei Uplift,Ordos *** fission-track and apatite/zircon(U-Th)/He thermochronometry,bitumen reflectance,thermal conductivity of rocks,paleotemperature recovery,and basin modeling were used to restore the Meso-Cenozoic tectonothermal history of the Permian *** Triassic AFT data have a pooled age of^180±7 Ma with one age peak and P(χ2)=86%.The average value of corrected apatite(U-Th)/He age of two Permian sandstones is^168±4 Ma and a zircon(U-Th)/He age from the Cambrian strata is^231±14 *** reflectance and maximum paleotemperature of two Ordovician mudstones are 1.81%,1.57%and^210℃,~196℃*** undergoing a rapid subsidence and increasing temperature in Triassic influenced by intrusive rocks in some areas,the Permian strata experienced four cooling-uplift stages after the time when the maximum paleotemperature reached in late Jurassic:(1)A cooling stage(~163 Ma to^140 Ma)with temperatures ranging from^132℃to^53℃and a cooling rate of^3℃/Ma,an erosion thickness of^1900 m and an uplift rate of^82 m/Ma;(2)A cooling stage(~140 Ma to^52 Ma)with temperatures ranging from^53℃to^47℃and a cooling rate less than^0.1℃/Ma,an erosion thickness of^300 m and an uplift rate of^3 m/Ma;(3)(~52 Ma to^8 Ma)with^47℃to^43℃and^0.1℃/Ma,an erosion thickness of^500 m and an uplift rate of^11 m/Ma;(3)(~8 Ma to present)with^43℃to^20℃and^3℃/Ma,an erosion thickness of^650 m and an uplift rate of^81 m/*** tectonothermal evolutionary history of the Qishan area in Triassic was influenced by the interaction of the Qinling Orogeny and the Weibei Uplift,and the south Qishan area had the earliest uplift-cooling time compared to other parts within the Weibei *** early Eocene at^52 Ma and the late Miocene at^8 Ma,as two significant turning points after which both the rate of uplift and the rat

关键词： low temperature thermochronology fission track (U-Th)/He basin modeling cooling history uplift Ordos Basin

Urbanization Flagship

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ChinAfrica 2015年第3期7卷 32-33页

作者： ni tao The Chinese-built Kilamba Kiaxi city project in Angola is a learning curve for African urban extension strategies

A four-hour commute through gridlocked downtown Luanda used to be the most frustrating part of Alexandre＇s daily life. But now the resident of the new city project named Kilamba Kiaxi, located some 30 km south of Angola＇s capital Luanda. is enjoying the peace and order of a well-planned satellite city. ＂With complete infrastructure and public utilities, there is not much worry about electricity or water [supply dis- ruptions] that often happen in downtown Luanda,＂ he told ChinAfrica. There are no congestions and Alexandre also has the convenience of sending his children to schools in the city.

关键词： CITIC Urbanization Flagship