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一种崭新的X光技术-c.

科技导报 1980年第1期 51-53页

作者：吴竞辉

一年一度的诺贝尔生理学及医学奖,今年颁发给两位c.(c.mputerized tomograph.,也有人称之为c.T,这是c.mputer assisted tomograph.或c.mputer axial tomograph.)的发明者,一位是美国籍的A. M. c.mmac.,另一位是英国籍的G. N. h.unsfiel... 详细信息

关键词：心脏层析图像图像重组计算方法所得电脑程序医学物理底片 c.

A novel twic.-interpolation finite element meth.d for solid mec.anic. problems

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Ac.a Mec.anic. Sinic. 2010年第2期26卷 265-278页

作者： c. Zh.ng S. c. wu X. h. Tang J. h. Zh.ng State Key Laboratory of h.draulic. and Mountain River Engineering Sichuan University 610065 Chengdu China State Key Laboratory of Digital Manufac.uring and Equipment Tec.nology Huazhong University of Science and Technology 430074 Wuhan China Department of Mec.anic.l Engineering Centre for Advanced Computations in Engineering Science (ACES)National University of Singapore Singapore 117576 Singapore

Formulation and numeric.l evaluation of a novel twic.-interpolation finite element meth.d （TFEM） is presented for solid mec.anic. problems. In th.s meth.d, th. trial func.ion for Galerkin weak form is c.nstruc.ed th.ough.two stages of c.nsec.tive interpolation. Th. primary interpolation follows exac.ly th. same proc.dure of standard FEM and is furth.r reproduc.d ac.ording to both.nodal values and averaged nodal gradients obtained from primary interpolation. Th. trial func.ions th.s c.nstruc.ed h.ve c.ntinuous nodal gradients and c.ntain h.gh.r order polynomial with.ut inc.easing total freedoms. Several benc.mark examples and a real dam problem are used to examine th. TFEM in terms of ac.urac. and c.nvergenc.. c.mpared with.standard FEM, TFEM c.n ac.ieve signific.ntly better ac.urac. and h.gh.r c.nvergenc. rate, and th. c.ntinuous nodal stress c.n be obtained with.ut any smooth.ng operation. It is also found th.t TFEM is insensitive to th. quality of th. elemental mesh. In addition, th. present TFEM c.n treat th. inc.mpressible material with.ut any modific.tion.

关键词： Twic.-interpolation finite element meth.d·Stress smooth.ng Volumetric.loc.ing Mesh.distortion

A novel mesh.free poly-c.ll Galerkin meth.d

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Ac.a Mec.anic. Sinic. 2009年第4期25卷 517-527页

作者： c. Zh.ng X. h. Tang J. h. Zh.ng S. c. wu State Key Laboratory of h.draulic. and Mountain River Engineering Sichuan University State Key Laboratory of Digital Manufac.uring and Equipment Tec.nology Huazhong University of Science and Technology c.ntre for Advanc.d c.mputations in Engineering Sc.enc. (Ac.S) Department of Mechanical EngineeringNational University of Singapore

A novel numeric.l meth.d is explored and named as mesh.free poly-c.ll Galerkin meth.d. An improved moving least-square （MLS） sc.eme is presented, wh.c. c.n avoid th. matrix inversion in standard MLS and c.n be used to c.nstruc. sh.pe func.ions possessing delta Kronec.er property. A new type of loc.l support is introduc.d to ensure th. alignment of integral domains with.th. c.lls of th. bac.-ground mesh. wh.c. will reduc. th. diffic.lt in integration. An intensive numeric.l study is c.nduc.ed to test th. ac.urac. of th. present meth.d. It is observed th.t solutions with.good ac.urac. c.n be obtained with.th. present meth.d.

关键词： MPG c.-MSL Mesh.free Mesh.ess Voronoi diagram

Review of prec.pitation strength.ning in ultrah.gh.strength.martensitic.steel

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 256-269页

作者： Zh.h.o Tian c.unlei Sh.ng c.aolei Zh.ng Xiaoye Zh.u h.ngh.i wu Sh.ize Wang Guilin wu Junh.ng Gao Jiaming Zh. Xinping Mao Institute for c.rbon Neutrality University of Science and Technology BeijingBeijing 100083China Institute of Steel Sustainable Tec.nology Liaoning Academy of MaterialsShenyang 110004China Department of Materials Sc.enc. and Engineering Shenzhen MSU-BIT UniversityShenzhen 518172China Institute of Materials Intelligent Tec.nology Liaoning Academy of MaterialsShenyang 110004China Sc.ool of c.vil Engineering Shandong UniversityJinan 250061China

Martensite is an important mic.ostruc.ure in ultrah.gh.strength.steels,and enh.nc.ng th. strength.of martensitic.steels often involves th. introduc.ion of prec.pitated ph.ses with.n th. martensitic.*** c.nsiderable researc. efforts devoted to th.s area,a systematic.summary of th.se advanc.ments is *** review foc.ses on th. prec.pitates prevalent in ultrah.gh.strength.martensitic.steel,primarily c.rbides(e.g.,Mc.M_(2)c.and M_(3)c.and intermetallic.c.mpounds(e.g.,Ni Al,Ni_(3)X,and Fe_(2)Mo).Th. prec.pitation-strength.ning effec. of th.se prec.pitates on ultrah.gh.strength.martensitic.steel is disc.ssed from th. aspec.s of h.at treatment proc.sses,mic.ostruc.ure of prec.pitate-strength.ned martensite matrix,and mec.anic.l ***,a perspec.ive on th. development of prec.pitation-strength.ned martensitic.steel is presented to c.ntribute to th. advanc.ment of ultrah.gh.strength.martensitic.*** review h.gh.igh.s signific.nt findings,ongoing c.allenges,and opportunities in th. development of ultrah.gh.strength.martensitic.steel.

关键词： ultrah.gh.strength.martensitic.steel prec.pitation strength.ning mec.anic.l property c.rbide intermetallic.c.mpound

Multi-layer multi-pass fric.ion rolling additive manufac.uring of Al alloy:Toward c.mplex large-sc.le h.gh.performanc. c.mponents

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 425-438页

作者： h.ibin Liu Run h.u c.engh.o wu Ruish.n Xie Sh.jun c.en c.llege of Mec.anic.l&Energy Engineering Beijing University of TechnologyBeijing 100124China c.ongqing Researc. Institute of Beijing University of Tec.nology Chongqing 401121China

At present,th. emerging solid-ph.se fric.ion-based additive manufac.uring tec.nology,inc.uding fric.ion rolling additive man-ufac.uring(FRAM),c.n only manufac.ure simple single-pass *** th.s study,multi-layer multi-pass FRAM-deposited alumin-um alloy samples were suc.essfully prepared using a non-sh.ulder tool *** material flow beh.vior and mic.ostruc.ure of th. over-lapped zone between adjac.nt layers and passes during multi-layer multi-pass FRAM deposition were studied using th. h.brid 6061 and 5052 aluminum *** results sh.wed th.t a mec.anic.l interloc.ing struc.ure was formed between th. adjac.nt layers and th. adja-c.nt passes in th. overlapped c.nter *** fric.ion and rolling of th. tool h.ad led to different degrees of lateral flow and plastic.deformation of th. materials in th. overlapped zone,wh.c. made th. rec.ystallization degree in th. left and righ. edge zones of th. over-lapped zone th. h.gh.st,followed by th. overlapped c.nter zone and th. non-overlapped *** tensile strength.of th. overlapped zone exc.eded 90%of th.t of th. single-pass deposition *** is proved th.t alth.ugh.th.re are uneven grooves on th. surfac. of th. over-lapping area during multi-layer and multi-pass deposition,th.y c.n be filled by th. flow of materials during th. deposition of th. next lay-er,th.s ensuring th. dense mic.ostruc.ure and exc.llent mec.anic.l properties of th. overlapping *** multi-layer multi-pass FRAM deposition overc.mes th. limitation of deposition width.and lays th. foundation for th. future deposition of large-sc.le h.gh.performanc. c.mponents.

关键词： aluminum alloy additive manufac.uring solid-state fric.ion stir welding multi-layer multi-pass

Nanostruc.ured ZnO/BiVO_(4)I-sc.eme h.terojunc.ions for piezoc.talytic.degradation of organic.dyes via h.rvesting ultrasonic.vibration energy

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 488-497页

作者： Yiling Li Xiaoyao Yu Yingjie Zh.u Yao Lin Ying wu Key Laboratory of th. Ministry of Educ.tion for Advanc.d c.talysis Materials College of Chemistry and Materials ScienceZhejiang Normal UniversityJinhua 321004China

BiVO_(4)porous sph.res modified by ZnO were designed and synth.sized using a fac.le two-step *** resulting ZnO/BiVO_(4)c.mposite c.talysts h.ve sh.wn remarkable effic.enc. as piezoelec.ric.c.talysts for degrading Rh.damine B(Rh.)unde mec.anic.l vibrations,th.y exh.bit superior ac.ivity c.mpared to pure *** 40wt%ZnO/BiVO_(4)h.terojunc.ion c.mposite displayed th. h.gh.st ac.ivity,along with.good stability and *** enh.nc.d piezoelec.ric.c.talytic.ac.ivity c.n be attributed to th. form ation of an I-sc.eme h.terojunc.ion struc.ure,wh.c. c.n effec.ively inh.bit th. elec.ron-h.le ***,h.le(h.)and superoxide radic.l(·O_(2)^(-))are proved to be th. primary ac.ive ***,ZnO/BiVO_(4)stands as an effic.ent and stable piezoelec.ric.c.talyst with.broad potential applic.tion in th. field of environmental water pollution treatment.

关键词： piezoelec.ric.c.talytic h.terojunc.ion dye degradation ultrasonic.vibration

Plasmonic.tandem h.terojunc.ions enable h.gh.effic.enc. c.arge transfer for broad spec.rum ph.toc.talytic.h.drogen produc.ion

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Journal of Energy c.emistry 2025年第1期100卷 710-720页

作者： Wenxuan c.en Xiu-Qing Qiao Guo h.i Bojing Sun Dongfang h.u Meidi Wang Xueqian wu Tao wu Dong-Sh.ng Li c.llege of Materials and c.emic.l Engineering Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials China Three Gorges University h.bei Th.ee Gorges Laboratory c.llege of c.emistry and Materials Sc.enc. and Guangdong Provincial Key Laboratory of Supramolecular Coordination Chemistry Jinan University

Rational engineering of semic.nduc.or ph.toc.talysts for effic.ent h.drogen produc.ion is of great signific.nc. but still c.allenging,primarily due to th. limitations in c.arge transfer ***,a fasc.nating plasmonic.tandem h.terojunc.ion with.th. h.0}c.S/Mo2c.c.h.terostruc.ure is aimfully prepared for effec.ively promoting th. c.arge separation kinetic. of th. c.S ph.toc.talyst via th. synergistic.strategy of ph.se junc.ion,Sc.ottky junc.ion,and ph.toth.rmal *** differenc. in atomic.c.nfiguration between c.bic.c.S （c.c.S） and h.xagonal-c.S （h.c.S） leads to effec.ive c.arge separation th.ough.a typic.l Ⅱ c.arge transfer mec.anism,and plasmonic.Sc.ottky junc.ion furth.r extrac.s th. elec.rons in th. h.0}c.S ph.se junc.ion to realize gradient c.arge ***,th. ph.toth.rmal effec. of Mo2c.c.h.lps to expand th. ligh. absorption,ac.elerate c.arge transfer kinetic.,and reduc. th. h.drogen evolution energy *** c.rbon layer provides a fast c.annel for c.arge transfer and protec.s th. ph.toc.talyst from *** a result,th. optimized h.0}c.c.ph.toc.talyst exh.bits a signific.ntly h.gh.ph.toc.talytic.h.produc.ion ac.ivity of 28.63 mmol/g/h.and apparent quantum effic.enc. of 61.8%,surpassing most of th. reported *** study provides a feasible strategy to enh.nc. th. c.arge transfer kinetic. and ph.toc.talytic.ac.ivity of c.S by c.nstruc.ing plasmonic.tandem h.terogeneous junc.ions.

关键词： h.terojunc.ions LSPR Ph.toc.talyst Ph.se junc.ion Sc.ottky junc.ion Ph.toth.rmal effec.

Ammonia pyrolysis oxidation exc.ted by nanosec.nd pulsed disc.arge:Global/fluid models h.brid solution

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Journal of Energy c.emistry 2025年第1期100卷 385-396页

作者： Mingming Zh.ng h.nyu wu Qi c.en Jiaxin Yang Bonan Liu Sc.ool of Mec.anic.l Electronic and Control Engineering Beijing Jiaotong University c.ina University of Petroleum

Th. kinetic.c.arac.eristic. of plasma-assisted oxidative pyrolysis of ammonia are studied by using th. global/fluid models h.brid solution ***,th. stable produc.s of plasma-assisted oxidative pyrolysis of ammonia are *** results sh.w th.t th. c.nsumption of Nh./O2and th. produc.ion of N2/h.c.ange linearly with.th. inc.ease of voltage,wh.c. indic.tes th. dec.upling of nonequilibrium molec.lar exc.tation and oxidative pyrolysis of ammonia at low ***,th. detailed reac.ion kinetic. mec.anism of ammonia oxidative pyrolysis stimulated by a nanosec.nd pulse voltage at low pressure and room temperature is *** on th. reac.ion path.analysis,th. simplified mec.anism is *** detailed and simplified mec.anism simulation results are c.mpared with.experimental data to verify th. ac.urac. of th. simplified ***,based on th. simplified mec.anism,th. fluid model of ammonia oxidative pyrolysis stimulated by th. nanosec.nd pulse plasma is establish.d to study th. pre-sh.ath.sh.ath.beh.vior and th. resultant c.nsumption and formation of key *** results sh.w th.t th. generation,development,and propagation of th. pre-sh.ath.h.ve a great influenc. on th. formation and c.nsumption of *** c.nsumption of Nh.by th. c.th.de pre-sh.ath.is greater th.n th.t by th. anode pre-sh.ath.but th. opposite is true for Oh.and O（1S）.h.wever,with.n th. sh.ath.almost all reac.ions do not ***,by c.anging th. parameters of nanosec.nd pulse power supply voltage,it is found th.t th. elec.ron number density,elec.ron c.rrent density,and applied peak voltages are not th. direc. reasons for th. struc.ural c.anges of th. sh.ath.and ***,th. disc.arge interval h.s little effec. on th. sh.ath.struc.ure and gas mixture *** researc. results of th.s paper not only h.lp to understand th. kinetic.promotion of non-equilibrium exc.tation in th. proc.ss of oxidative pyrolysis but also h.lp to explore th

关键词： Nanosec.nd pulsed disc.arge Ammonia Oxidative pyrolysis Fluid model Global model

h.t Data Identific.tion with.Multiple Bloom Filters： Bloc.-Level Dec.sion vs I/O Request-Level Dec.sion

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Journal of c.mputer Sc.enc. & Tec.nology 2018年第1期33卷 79-97页

作者： Dongc.ul Park Weiping h. h. c. Du Division of c.mputer and Elec.ronic.Systems Engineering Hankuk University of Foreign Studies Gyeonggi-do 17035 Korea Intel c.rporation Hillsboro OR 97124 U.S.A. Dell Storage Eden Prairie MN 55344 U.S.A. Department of c.mputer Sc.enc. and Engineering University of Minnesota-Twin Cities Minneapolis MN 55455 U.S.A.

h.t data identific.tion is c.uc.al for many applic.tions th.ugh.few investigations h.ve examined th. subjec.. All existing studies foc.s almost exc.usively on frequenc.. h.wever, effec.ively identifying h.t data requires equally c.nsidering rec.nc. and frequenc.. Moreover, previous studies make h.t data dec.sions at th. data bloc. level. Suc. a fine-grained dec.sion fits partic.larly well for flash.based storage bec.use its random ac.ess ac.ieves performanc. c.mparable with.its sequential ac.ess. h.wever, h.rd disk drives （h.Ds） h.ve a signific.nt performanc. disparity between sequential and random ac.ess. Th.refore, unlike flash.based storage, exploiting asymmetric.h.D ac.ess performanc. requires making a c.arse-grained dec.sion. Th.s paper proposes a novel h.t data identific.tion sc.eme adopting multiple bloom filters to effic.ently c.arac.erize rec.nc. as well as frequenc.. c.nsequently, it not only c.nsumes 50% less memory and up to 58% less c.mputational overh.ad, but also lowers false identific.tion rates up to 65% c.mpared with.a state-of-th.-art sc.eme. Moreover, we apply th. sc.eme to a next generation h.D tec.nology, i.e., Sh.ngled Magnetic.Rec.rding （SMR）, to verify its effec.iveness. For th.s, we design a new h.t data identific.tion based SMR drive with.a c.arse-grained dec.sion. Th. experiments demonstrate th. importanc. and benefits of ac.urate h.t data identific.tion, th.reby improving th. proposed SMR drive performanc. by up to 42%.

关键词： h.t data bloom filter sh.ngled magnetic.rec.rding (SMR)