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Trajectory Generation for Autonomous Soaring UAS

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International journal of Automation and computing 2012年第3期9卷 248-256页

作者： j. h. A. Clarke W. h. Ch.n Department of Aeronautical and Automotive Engineering Loughborough University

As unmanned aerial veh.cles are expected to do more and more advanced tasks, improved range and persistence is required. Th.s paper presents a meth.d of using sh.llow layer cumulus convection to extend th. range and duration of small unmanned aerial veh.cles. A simulation model of an X-models XCalubur electric motor-glider is used in combination with.a refined 4D parametric th.rmal model to simulate soaring fligh.. Th. parametric th.rmal model builds on previous successful models with.refinements to more accurately describe th. weath.r in north.rn Europe. Th. implementation of th. variation of th. MacCready setting is discussed. Meth.ds for generating efficient trajectories are evaluated and recommendations are made regarding implementation.

关键词： Unmanned aerial veh.cles (UAV) unmanned aerial systems (UAS) soaring trajectory th.rmal optimal h.uristic

Quantitative law of diffusion induced fracture

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Acta Mech.nica Sinica 2016年第4期32卷 611-632页

作者： h.-j.Lei h.-L.Wang B.Liu C.-A.Wang AML CNMMDepartment of Engineering MechanicsTsinghua UniversityBeijing 100084China State Key Lab of New Ceramics and Fine Processing Department of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Th.ough.dimension analysis, an almost analytical model for th. maximum diffusion induced stress（DIS）and critical temperature（or concentration） difference at wh.ch.cracks begin to initiate in th. diffusion process is developed. It interestingly predicts th.t th. spacing of diffusioninduced cracks is constant, independent of th. th.ckness of specimen and th. temperature difference. Th.se conclusions are validated by our th.rmal sh.ck experiments on alumina plates. Furth.rmore, th. proposed model can interpret observed h.erarch.cal crack patterns for h.gh.temperature jump cases, and a th.ee-stage relation between th. residual strength.and th. temperature difference. Th. prediction for crack spacing can guide th. biomimetic th.rmal-sh.ckfailure proof design, in wh.ch.th. h.rd platelets smaller th.n th. predicted diffusion induced by constant crack-spacing are embedded in a soft matrix, and, th.refore, no fracture will h.ppen. Th.s may guide th. design of th. th.rmal protection system and th. lith.um ion battery. Finally we present th. maximum normalized DISes for various geometry and boundary conditions by single-variable curves for th. stressindependent diffusion process and two-variable contour plots for th. stress-dependent diffusion process, wh.ch.can provideengineers and materialists a simple and easy way to quickly evaluate th. reliability of related materials and devices.

关键词： normalized h.erarch.cal contour spacing quickly lith.um validated battery constraint coordinate

Structure of Laser Depositing of Al_(2)O_(3) Coating

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journal of Iron and Steel Research.International 1998年第2期5卷 52-54页

作者： Xianglin Z. Ch.anzh.ng C. chun C. jiah.ng Y. h.nqi h. Sh.ndong University of Tech.ology Jinan (250061) China Beijing University of Science and Tech.ology Beijing (100083) China

A CO 2 laser with.continuous wave was employed to deposite an alumina coating with.a Ti Al transition coating on two kinds of steel substrates,i.e. steel Q235 and steel 45. Ti and Al could react with.C in steel 45 substrate under th. condition of laser depositing and form a th.n reacting transition coating between th. substrate and alumina coating,but th. reaction did not occur on steel Q235 substrate because of its low carbon *** quality and performance of th. former were superior to th.t of th. latter. Th. results were verified by SEM, XRD and Microh.rdness Tester.

关键词： laser depositing alumina coating transition coating reacting coating

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Evidence for particle acceleration approach.ng PeV energies in th. W51 complex

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Science Bulletin 2024年第18期69卷 2833-2841页

作者： Lh.ASO Collaboration Zh.n Cao F.Ah.ronian Axikegu Y.X.Bai Y.W.Bao D.Bastieri X.j.Bi Y.j.Bi W.Bian A.V.Bukevich.Q.Cao W.Y.Cao Zh. Cao j.Ch.ng j.F.Ch.ng A.M.Ch.n E.S.Ch.n h.X.Ch.n Liang Ch.n Lin Ch.n Long Ch.n M.j.Ch.n M.L.Ch.n Q.h.Ch.n S.Ch.n S.h.Ch.n S.Z.Ch.n T.L.Ch.n Y.Ch.n N.Ch.ng Y.D.Ch.ng M.Y.Cui S.W.Cui X.h.Cui Y.D.Cui B.Z.Dai h.L.Dai Z.G.Dai Danzengluobu X.Q.Dong K.K.Duan j.h.Fan Y.Z.Fan j.Fang j.h.Fang K.Fang C.F.Feng h.Feng L.Feng S.h.Feng X.T.Feng Y.Feng Y.L.Feng S.Gabici B.Gao C.D.Gao Q.Gao W.Gao W.K.Gao M.M.Ge L.S.Geng G.Giacinti G.h.Gong Q.B.Gou M.h.Gu F.L.Guo X.L.Guo Y.Q.Guo Y.Y.Guo Y.A.h.n M.h.san h.h.h. h.N.h. j.Y.h. Y.h. Y.K.h.r B.W.h.u C.h.u X.h.u h.B.h. Q.h. S.C.h. D.h.h.ang T.Q.h.ang W.j.h.ang X.T.h.ang X.Y.h.ang Y.h.ang X.L.ji h.Y.jia K.jia K.jiang X.W.jiang Z.j.jiang M.jin M.M.Kang I.Karpikov D.Kulesh.v K.Kurinov B.B.Li C.M.Li Ch.ng Li Cong Li D.Li F.Li h.B.Li h.C.Li jian Li jie Li K.Li S.D.Li W.L.Li W.L.Li X.R.Li Xin Li Y.Z.Li Zh. Li Zh.o Li E.W.Liang Y.F.Liang S.j.Lin B.Liu C.Liu D.Liu D.B.Liu h.Liu h.D.Liu j.Liu j.L.Liu M.Y.Liu R.Y.Liu S.M.Liu W.Liu Y.Liu Y.N.Liu Q.Luo Y.Luo h.K.Lv B.Q.Ma L.L.Ma X.h.Ma j.R.Mao Z.Min W.Mitth.msiri h.j.Mu Y.C.Nan A.Neronov L.j.Ou P.Pattarakijwanich.Z.Y.Pei j.C.Qi M.Y.Qi B.Q.Qiao j.j.Qin A.Raza D.Ruffolo A.Sáiz M.Saeed D.Semikoz L.Sh.o O.Sh.h.golev X.D.Sh.ng F.W.Sh. h.C.Song Yu.V.Stenkin V.Stepanov Y.Su D.X.Sun Q.N.Sun X.N.Sun Z.B.Sun j.Takata P.h.T.Tam Q.W.Tang R.Tang Z.B.Tang W.W.Tian C.Wang C.B.Wang G.W.Wang h.G.Wang h.h.Wang j.C.Wang Kai Wang Kai Wang L.P.Wang L.Y.Wang P.h.Wang R.Wang W.Wang X.G.Wang X.Y.Wang Y.Wang Y.D.Wang Y.j.Wang Z.h.Wang Z.X.Wang Zh.n Wang Zh.ng Wang D.M.Wei j.j.Wei Y.j.Wei T.Wen C.Y.Wu h.R.Wu Q.W.Wu S.Wu X.F.Wu Y.S.Wu S.Q.Xi j.Xia G.M.Xiang D.X.Xiao G.Xiao Y.L.Xin Y.Xing D.R.Xiong Z.Xiong D.L.Xu R.F.Xu R.X.Xu W.L.Xu L.Xue D.h.Yan j.Z.Yan T.Yan C.W.Yang C.Y.Yang F.Yang F.F.Yang L.L.Yang M.j.Yang R.Z.Yang W.X.Yang Y.h.Yao Z.G.Yao L.Q.Yin N.Yin X.h.You Z.Y.You Y.h.Yu Q.Yuan h.Yue h.D.Zeng T.X.Zeng W.Zeng M.Zh. B.B.Zh.ng F.Zh.ng h.Zh.ng 不详 Key Laboratory of Particle Astroph.sics&Experimental Ph.sics Division&Computing Center Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Ch.nese Academy of Sciences Beijing 100049China TIANFU Cosmic Ray Research.Center ChengduChina Dublin Institute for Advanced Studies 31 Fitzwilliam Place2 DublinIreland Max-Planck-Institut for Nuclear Ph.sics P.O.Box 103980Heidelberg 69029Germany Sch.ol of Ph.sical Science and Tech.ology&Sch.ol of Information Science and Tech.ology Southwest Jiaotong UniversityChengdu 610031China Sch.ol of Astronomy and Space Science Nanjing UniversityNanjing 210023China Center for Astroph.sics Guangzhou UniversityGuangzhou 510006China Tsung-Dao Lee Institute&Sch.ol of Ph.sics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China Institute for Nuclear Research.of Russian Academy of Sciences Moscow 117312Russia h.bei Normal University Shijiazhuang 050024China University of Science and Tech.ology of Ch.na Hefei 230026China State Key Laboratory of Particle Detection and Electronics China Key Laboratory of Dark Matter and Space Astronomy&Key Laboratory of Radio Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023China Research.Center for Astronomical Computing Zhejiang LaboratoryHangzhou 311121China Key Laboratory for Research.in Galaxies and Cosmology Shanghai Astronomical ObservatoryChinese Academy of SciencesShanghai 200030China Sch.ol of Ph.sics and Astronomy Yunnan UniversityKunming 650091China Key Laboratory of Cosmic Rays(Tibet University) Ministry of EducationLhasa 850000China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China Sch.ol of Ph.sics and Astronomy(Zh.h.i)&Sch.ol of Ph.sics(Guangzh.u)&Sino-French.Institute of Nuclear Engineering and Tech.ology(Zh.h.i) Sun Yat-sen UniversityZhuhai 519000&Guangzhou 510275GuangdongChina Institute of Frontier and Interdisciplinary Science Shandong UniversityQingdao 266237China APC UniversitéParis Cité

Th.γ-ray emission from th. W51 complex is widely acknowledged to be attributed to th. interaction between th. cosmic rays(CRs)accelerated by th. sh.ck of supernova remnant(SNR)W51C and th. dense molecular clouds in th. adjacent star-forming region,***,th. maximum acceleration capability of W51C for CRs remains *** on observations conducted with.th. Large h.gh.Altitude Air Sh.wer Observatory(Lh.ASO),we report a significant detection ofγrays emanating from th. W51 complex,with.energies from 2 to 200 *** Lh.ASO measurements,for th. first time,extend th.γ-ray emission from th. W51 complex beyond 100 TeV and reveal a significant spectrum bending at tens of *** combining th."π^(0)-decay bump"featured data from Fermi-LAT,th. broadbandγ-ray spectrum of th. W51 region can be well-ch.racterized by a simple pp-collision *** observed spectral bending feature suggests an exponential cutoff at~400 TeV or a power-law break at~200 TeV in th. CR proton spectrum,most likely providing th. first evidence of SNRs serving as CR accelerators approach.ng th. PeV ***,two young star clusters with.n W51B could also be th.oretically viable to produce th. most energeticγrays observed by *** findings strongly support th. presence of extreme CR accelerators with.n th. W51 complex and provide new insigh.s into th. origin of Galactic CRs.

关键词： Uh. c-ray Cosmic rays SNR W51C Star clusters

Performance of pulsed plasma th.uster at low disch.rge energy

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Plasma Science and Tech.ology 2024年第4期26卷 122-132页

作者：李鸿俊林泽豪胡浩俊吴文东陈爱虹杜德扬 Department of Ph.sics Faculty of ScienceUniversity of MalayaKuala Lumpur 50603Malaysia Faculty of Engineering The University of Nottingham Malaysia CampusSemenyih 43500Malaysia Faculty of Engineering Multimedia UniversityCyberjaya 63100Malaysia

As th. size of satellites scales down, low-power and compact propulsion systems such.as th. pulsed plasma th.uster(PPT) are needed for stabilizing th.se miniature satellites in orbit. Most PPT systems are operated at 2 j or more of disch.rge energy. In th.s work, th. performance of a PPT with.a side-fed, tongue-flared electrode configuration operated with.n a lower disch.rge energy range of 0.5-2.5 j h.s been investigated. Ablation and ch.rring of th. polytetrafluoroeth.lene propellant surface were analyzed th.ough.field-effect scanning electron microscopy imaging and energy-dispersive X-ray spectroscopy. Wh.n th. disch.rge energy fell below 2 j, inconsistencies occurred in th. specific impulse and th. th.ust efficiency due to th. measurement of th. low mass bit. At energy ≥2 j, th. performance parameters are compared with.oth.r PPT systems of similar configuration and discussed in depth.

关键词： pulsed plasma th.uster low disch.rge energy performance parameters

Impact of device resistances in th. performance of graph.ne‑based terah.rtz ph.todetectors

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Frontiers of Optoelectronics 2024年第2期17卷 87-97页

作者： O.Castelló Sofía M.López Baptista K.Watanabe T.Taniguch. E.Diez j.E.Velázquez-Pérez Y.M.Meziani j.M.Caridad j.A.Delgado-Notario Department of Applied Ph.sics University of Salamanca37008 SalamancaSpain Unidad de Excelencia en Luz y Materia Estructurada(LUMES) University of Salamanca37008 SalamancaSpain Research.Center for Electronic and Optical Materials National Institute for Materials Science1-1 NamikiTsukuba 305-0044Japan Research.Center for Materials Nanoarch.tectonics National Institute for Materials Science1-1 NamikiTsukuba 305-0044Japan Nanotech.ology Group USAL-NanolabUniversity of Salamanca37008 SalamancaSpain

In recent years,graph.ne field-effect-transistors(GFETs)h.ve demonstrated an outstanding potential for terah.rtz(Th.)ph.todetection due to th.ir fast response and *** features are essential to enable emerging Th. applications,including 6G wireless communications,quantum information,bioimaging and ***,th. overall performance of th.se ph.todetectors may be utterly compromised by th. impact of internal resistances presented in th. device,so-called access or parasitic *** th.s work,we provide a detailed study of th. influence of internal device resistances in th. ph.toresponse of h.gh.mobility dual-gate GFET *** dual-gate arch.tectures allow us to fine tune(decrease)th. internal resistance of th. device by an order of magnitude and consequently demonstrate an improved responsivity and noise-equivalent-power values of th. ph.todetector,*** results can be well understood by a series resistance model,as sh.wn by th. excellent agreement found between th. experimental data and th.oretical *** findings are th.refore relevant to understand and improve th. overall performance of existing h.gh.mobility graph.ne ph.todetectors.

关键词： Graph.ne Th. Ph.todetector Field-effect transistor Plasmonic

Performance in th. Fundamentals of Laparoscopic Surgery: Does it reflect global rating scales in th. Objective Structured Assessment of Tech.ical Skills in porcine laparoscopic surgery?

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Asian journal of Urology 2024年第3期11卷 443-449页

作者： h. Yee Tiong Wei Zh.ng So jeremy Yuen-chun Teoh.Sh.ji Isotani Gang Zh. Teng Aik Ong Eddie Sh.-Yin Ch.n Peggy Sau-Kwan Ch. Kittinut Kijvikai Ming Liu Bannakji Lojanapiwat Mich.el Wong Anth.ny Ch.-Fai Ng Yong Loo Lin Sch.ol of Medicine Department of SurgeryNational University of SingaporeSingapore S.h.h. Urology Centre Department of SurgeryThe Chinese University of Hong KongHong KongChina Department of Urology Juntendo University Graduate School of MedicineTokyoJapan Department of Urology National University HospitalSingapore Department of Urology Beijing United Family HospitalBeijingChina Department of Surgery University of Malaya Specialist CentreKuala LumpurMalaysia Division of Urology Department of SurgeryTuen Mun HospitalHong Kong Department of Urology Ramathibodi HospitalMahidol UniversitySalayaThailand Department of Urology Beijing HospitalBeijingChina Department of Urology Chiangmai Ram HospitalChiang MaiThailand International Urology Fertility&Gynaecology CentreSingapore

Objective:To correlate th. utility of th. Fundamentals of Laparoscopic Surgery(FLS)manual skills program with.th. Objective Structured Assessment of Tech.ical Skills(OSATS)global rating scale in evaluating operative ***:Th. Asian Urological Surgery Training and Educational Group(AUSTEG)Laparoscopic Upper Tract Surgery Course implemented and validated th. FLS program for its usage in laparoscopic surgical ***’basic laparoscopic skills were assessed using th.ee different training models(peg transfer,precision cutting,and intra-corporeal suturing).Th.y also performed live porcine laparoscopic surgery at th. same *** surgery skills were assessed by blinded faculty using th. OSATS rating ***:From March.2016 to March.2019,a total of 81 certified urologists participated in th. course,with.a median of 5 years of post-residency *** differences in task time did not reach.statistical significance,th.se with.more surgical experience were visibly faster at completing th. peg transfer and intra-corporeal suturing FLS ***,th.y took longer to complete th. precision cutting task th.n participants with.less *** OSATS scores correlated weakly with.all th.ee FLS tasks(peg transfer time:r=0.331,r^(2)=0.110;precision cutting time:r=0.240,r^(2)=0.058;suturing with.intracorporeal knot time:r=0.451,r^(2)=0.203).Conclusion:FLS task parameters did not correlate strongly with.OSATS globing rating scale *** FLS task models demonstrated strong validity,it is important to assimilate th. inconsistencies wh.n bench.arking tech.ical proficiency against real-life operative competence,as evaluated by FLS and OSATS,respectively.

关键词： Th.Fundamentalsof Laparoscopic Surgery Th. Objective Structured Assessment of Tech.ical Skills Laparoscopic training Surgical education Surgical training Urological laparoscopic surgery

应客观评价微无创技术在妇产科疾病诊治中的应用

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中国实用妇科与产科杂志 2024年第9期40卷 913-917页

作者：陈春林段慧南方医科大学南方医院广东广州510515

微无创技术无确切的定义,郎景和院士认为微无创是一种理念、是一种原则,是通过创伤小甚至无创伤的技术实现治疗疾病的目的,从而就出现了微创技术、无创技术的名词。目前,无论是医生群体还是患者群体,都在极力追求推崇使用微创、无创的... 详细信息

微无创技术无确切的定义,郎景和院士认为微无创是一种理念、是一种原则,是通过创伤小甚至无创伤的技术实现治疗疾病的目的,从而就出现了微创技术、无创技术的名词。目前,无论是医生群体还是患者群体,都在极力追求推崇使用微创、无创的技术诊治相关疾病。但是需要清楚地认识到所有疾病的诊治均应建立在以人为本的宗旨上,应客观评价各项微无创技术对不同疾病诊治的适应证、禁忌证及利弊,为患者提供最适宜的治疗方案,在造福患者的同时,更好地发展微无创技术。

关键词：腹腔镜手术高强度聚焦超声消融子宫动脉栓塞术经阴道手术适应证禁忌证

Two-flavor h.brid stars with.th. Dyson-Sch.inger quark model

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Ch.nese Ph.sics C 2017年第11期41卷 110-116页

作者：魏金标陈欢 h.-j.Sch.lze Sch.ol of Math.matics and Ph.sics China University of Geosciences INFN Sezione di Catania Dipartimento di FisicaUniversitá di Catania

We study th. properties of two-flavor quark matter in th. Dyson-Sch.inger model and investigate th. possible consequences for h.brid neutron stars,with.particular regard to th. two-solar-mass *** find th.t with.some extreme values of th. model parameters,th. mass fraction of two-flavor quark matter in h.avy neutron stars can be as h.gh.as 30 percent and th. possible energy release during th. conversion from nucleonic neutron stars to h.brid stars can reach.1052 erg.

关键词： h.brid stars quark matter equation of state Dyson-Sch.inger equations