检索结果-南通市图书馆

EFFECT OF PREDEFORMATION MANNER ON SEMI-SOLID STRUCTURE OF AZ61 MAGNESIUM ALLOY IN SIMA PROCESS

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English.Letters) 2008年第3期21卷 197-204页

作者： G.P. Ch.n T.R. Zh.u h. yan Sch.ol of Mech.nical and Electrical Engineering Nanchang University Nanchang 330000 China Sch.ol of Mech.nical Engineering Hunan Industrial University Zhuzhou 412008 China

Th. effect of predeformation manner, predeformation ratio and isoth.rmal h.at-treat parameter on th. non-dendrite structure of AZ61 magnesium alloy in SIMA process was studied. Under coequal h.at-treat condition, th. impact of th. h.t upsetting pre- deformation on semi-solid microstructure in SIMA process was compared with.th.t of th. cold compressive predeformation. Th. results indicate th.t non-dendrite microstructure in AZ61 magnesium alloy billets can be obtained by h.t or cold upsetting predeformation in SIMA process, alth.ugh.th.ir mech.nisms of evolution are different. Increasing h.t or cold upsetting predeformation ratio can enh.nce th. effect and quality of th. non-dendrite microstructure formed before storage energy up to saturation, but th. proper isoth.rmal temperature and h.lding time sh.uld be selected.

关键词： AZ61 magnesium alloy Strain-induced melt activated (SIMA) h.t and cold upsetting Predeformation Non-dendrite structure

Investigated th. h.spital utilization and medical resource usage of h.emoph.lia A and B in Taiwan: 2001-2010

在线全文

学校读者我要写书评

暂无评论

h.alth 2013年第10期5卷 1-8页

作者： Yu h. yan Ch.h.M. Kung Department of Information Tech.ology and Communication Shih Chien University Kaohsiung Campus Kaohsiung Chinese Taipei Department of Medical Research Tainan Municipal Hospital Tainan Chinese Taipei

Aim: Th. purpose of th.s study was to explore th. impact of attributes of medical care organizations and patients on medical resource utilization by h.moph.lia (h.moph.lia A and h.moph.lia B;h.moph.lia with.musculoskeletal system and with.ut). Meth.ds: h.spitalization due to h.moph.lia (ICD9: 286.0 and 286.1) and h.moph.lia with.musculoskeletal system (ICD9: ***) between 2001 and 2010 were identified from a national h.alth.insurance database. Calculated by patients and h.spital ch.racteristics, length.of h.spital stay, medical cost of h.spitalization was analyzed. Results: Of th. total of 2150 patients, a systemic analysis of th. results sh.wed a mean patient age of 30.2 and average medical costs per patient of NT $672,335 (US $21,010). We found th. mean cost of cases being significantly h.gh.r during th. h.moph.lia A th.t in th. h.moph.lia B (NT $708,620 vs. NT $422,322, P

关键词： h.moph.lia Musculoskeletal System National h.alth Insurance

Th. Impact of h.spital Accreditation System: Perspective of Organizational Learning

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

h.alth 2015年第9期7卷 1081-1089页

作者： Yu h. yan Ch.h.M. Kung Department of Medical Research Tainan Municipal Hospital Tainan City Chinese Taipei Department of Information Tech.ology and Communication Shih Chien University Kaohsiung Campus Kaohsiung City Chinese Taipei

Objectives: Organizational learning is used to being a very important topic about h.spital management and even is identified as th. source of a h.spital’s competitive strength. Th. study tries to explore th. correlation between organizational learning and h.spital accreditation awareness from th. medical institution operation management’s point of view. Meth.ds: We designed th. questionnaire based on th. cross-section survey, wh.ch.included a total of 498 h.spitals th.ough.out Taiwan as th. subjects (1922 copies of questionnaire were distributed, 4 copies per h.spital). As a result, 306 returned th. questionnaire (995 copies of valid questionnaire), a valid response rate was 49.94%. Th.n, we conducted th. multiple regression analysis. Results: Th. factors critical to th. operations management accreditation awareness include age, h.spital ownersh.p, h.spital lever and team learning (p h. factors critical to th. medical care accreditation awareness include age, education level and team learning (p h. team learning will produce positive effect to th. h.spital accreditation awareness. Conclusions: Th. organizational continuous learning may enh.nce th. team learning th.ough.h.spital accreditation operations to ensure th.t th. medical treatment system may provide safe, valid and reliable h.alth.are and found th. h.spitals’ competitive strength.

关键词： h.spital Accreditation Organizational Learning Medical Care

Spontaneous Recovery in Directed Dynamical Networks

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Engineering 2024年第6期37卷 208-214页

作者： Xueming Liu Xian yan h.Eugene Stanley Sch.ol of Artificial Intelligence and Automation&Th. MOE Engineering Research.Center of Autonomous Intelligent Unmanned Systems&th. Key Laboratory of Image Processing Huazhong University of Science and TechnologyWuhan 430074China Center for Polymer Studies Department of PhysicsBoston UniversityBostonMA 02215USA

Complex networked systems,wh.ch.range from biological systems in th. natural world to infrastructure systems in th. h.man-made world,can exh.bit spontaneous recovery after a failure;for example,a brain may spontaneously return to normal after a seizure,and traffic flow can become smooth.again after a *** studies on th. spontaneous recovery of dynamical networks h.ve been limited to undirected ***,most real-world networks are *** fill th.s gap,we build a model in wh.ch.nodes may alternately fail and recover,and we develop a th.oretical tool to analyze th. recovery properties of directed dynamical *** find th.t th. tool can accurately predict th. final fraction of active nodes,and th. prediction accuracy decreases as th. fraction of bidirectional links in th. network increases,wh.ch.emph.sizes th. importance of directionality in network *** to different initial states,directed dynamical networks may sh.w alternative stable states under th. same control parameter,exh.biting h.steresis *** addition,for networks with.finite sizes,th. fraction of active nodes may jump back and forth.between h.gh.and low states,mimicking repetitive failure-recovery *** findings could h.lp clarify th. system recovery mech.nism and enable better design of networked systems with.h.gh.resilience.

关键词： Network resilience Directed dynamical networks Spontaneous recovery

Th. Production of 1,8-Cineole, a Potential Biofuel, from an Endoph.tic Strain of <i>Annuloh.poxylon</i>sp. FPYF3050 Wh.n Grown on Agricultural Residues

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Sustainable Bioenergy Systems 2017年第2期7卷 65-84页

作者： K. Y. Wang G. A. Strobel D.-h. yan Th. Research.Institute of Forest Ecology Environment and Protection Chinese Academy of Forestry Beijing China Department of Plant Sciences Montana State University Bozeman MT USA

An endoph.tic fungus producing 1,8-cineole from Neolitsea pulch.lla (Meissn.) Merr. was identified as Annuloh.poxylon sp. by ph.logenetic analyses of th. sequence alignments of ITS rDNA, β-tubulin, Actin and EF1-α. Th.s isolate produces an attractive spectrum of volatile organic compounds (VOCs) with.only one dominant component, 1,8-cineole, as identified by gas ch.omatograph.-mass spectrometry (GC-MS). Th. fungus was able to grow in seven media with.different carbon sources, and five raw agro-forest residues. Th. content of 1,8-cineole in th. mixed VOCs via fungus reach.d up to 94.95% and 91.25% relative area in PDA and raw poplar sawdust, respectively. Under optimum test conditions, th. fungus produced 1,8-cineole at th. 0.764 ppmv in 50 mL h.ad spaces in PDA. Interestingly, 1,8-cineole is an ideal fuel additive for both.diesel and gasoline engines. Also, th.s is th. first isolate, in th.s group of fungi, making cineole, wh.ch.produces as its primary VOC product wh.ch.makes it an ideal organism for strain improvement. Such.as step will be critical for its ultimate use in biofuel production.

关键词： 1 8-Cineole Agro-Forest Residues Endoph.tic Annuloh.poxylon Biofuel Fungal VOCs

Electromagnetic ch.racteristic analysis and design of a linear motor used for ultra-h.gh.speed EMS maglev train

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science Ch.na(Tech.ological Sciences) 2024年第6期67卷 1957-1973页

作者： GAO h.n Sh. TingNa GAO XinMai LEI yanXiao yan Dong GUO Liyan yan yan College of Electrical Engineering Zhejiang UniversityHangzhou310027China Zh.jiang University Advanced Electrical Equipment Innovation Center Hangzhou311107China State Key Laboratory of h.gh.speed Maglev Transportation Tech.ology Qingdao266100China CRRC Qingdao Sifang Co.Ltd. Qingdao266111China

Th. operating speed of th. commercial electromagnetic suspension(EMS)maglev train h.s been over 430 km/h.making it th. fastest means of land *** th. increasing demands of people traveling,it is necessary to furth.r improve th. operating speed of maglev *** to examine wh.th.r th. existing EMS system can meet th. requirements of ultra-h.gh.peed operation(more th.n 600 km/h.,th. electromagnetic ch.racteristics of an EMS linear motor under th. operating speed of 600–1000 km/h.fed by a square-wave voltage supply is investigated in th.s ***,an electromagnetic field model of th. EMS system under th. square-wave voltage supply is establish.d to investigate its electromagnetic performance,e.g.,th. ch.racteristics of ph.se current,th. magnetic flux density,and th. electromagnetic ***,th. relationsh.p between th. h.rmonic components of th. air-gap magnetic flux density and electromagnetic force is investigated using th. two-dimensional fast Fourier transform(2D-FFT)to reveal th. mech.nism of electromagnetic force ***,to address th. issues of excessive armature current density and significant electromagnetic force ripple,th. linear motor is re-designed by enlarging th. stator slot area and resh.ping th. mover's main magnetic ***,th. Taguch. meth.d is used to furth.r improve th. electromagnetic ch.racteristics of th. linear electric ***,th. effectiveness of th. proposed optimal design is validated by th. finite-element analysis(FEA)based co-simulation.

关键词： ultra-h.gh.speed maglev transportation electromagnetic suspension(EMS) linear motor electromagnetic force ripple suppression

Direct conversion of CO and h.(2)O to h.drocarbons at atmosph.ric pressure using a TiO_(2-x)/Ni ph.toth.rmal catalyst

在线全文

学校读者我要写书评

暂无评论

Science Ch.na Materials 2024年第3期67卷 1009-1010页

作者： yan Zh. Sch.ol of Ch.mistry and Ch.mical Engineering Nanjing UniversityNanjing 210093China

Generating h.gh.value ch.mical compounds by catalytically converting carbon resources—typically derived from coal and biomass, etc.—is crucial. It is more meaningful to ach.eve“carbon neutrality” and lower production costs by utilizing industrial waste carbon sources, such.as steel mill waste gases,wh.ch.are typically intended for direct emission or burning into CO_(2).

关键词： typically utilizing meaningful

Isotopic dependence of th. yield ratios of ligh. fragments from different projectiles and th.ir unified neutron skin th.cknesses

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Tech.iques 2024年第3期35卷 228-236页

作者： Ting-Zh. yan Sh.n Li Sch.ol of Energy and Power Engineering Northeast Electric Power UniversityJilin 132012China

Th. yield ratios of neutron-proton(R(n/p))and^(3)h.^(3)h.(R(^(3)h.^(3)h.))with.reduced rapidity from 0 to 0.5 were simulated at 50 MeV/u even-even ^(36−56)Ca+^(40)Ca,even-even ^(48−78)Ni+^(58)Ni,and ^(100−139)Sn(every th.rd isotopes)+112 Sn for full reduced impact parameters using th. isospin-dependent quantum molecular dynamics(IQMD)*** neutron and proton density distributions and root-mean-square radii of th. reaction systems were obtained using th. Skyrme-h.rtree-Fock model,wh.ch.was used for th. ph.se space initialization of th. projectile and target in *** defined th. unified neutron skin th.ckness asΔRnp=^(1∕2) n−^(1∕2)p,wh.ch.was negative for neutron-deficient *** unifiedΔRnp values for nuclei with.th. same relative neutron excess from different isotopic ch.ins were nearly equal,except for extreme neutron-rich.isotopes,wh.ch.is a type of scaling *** yield ratios of th. th.ee isotopic ch.in-induced reactions,wh.ch.depended on th. reduced impact parameter and unified neutron skin th.ckness,were *** results sh.wed th.t both.R(n/p)and R(^(3)h.^(3)h.)decreased with.a reduced impact parameter for extreme neutron-deficient isotopes;h.wever,th.y increased with.reduced impact parameters for extreme neutron-rich.isotopes,and increased with.th.ΔRnp of th. projectiles for all reduced impact *** addition,a scaling ph.nomenon was observed betweenΔR np and th. yield ratios in periph.ral colli-sions from different isotopic ch.in projectiles(except for extreme neutron-rich.isotopes).Th.s,R(n/p)and R(^(3)h.^(3)h.)from periph.ral collisions were suggested as experimental probes for extracting th. neutron or proton skin th.cknesses of non-extreme neutron-rich.nuclei from different isotopic ch.ins.

关键词： Exotic nuclei Unified neutron skin th.ckness Yield ratios IQMD

Th.oretical screening of cooperative N-bridged dual-atom sites for efficient electrocatalytic nitrogen reduction with.remolding insigh.

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第4期17卷 3413-3422页

作者： h.imei Ch.n yan yang Ch. Jiao Zh.wen Zh.o Junjie Mao yan Liu Key Laboratory of Functional Molecular Solids Ministry of EducationCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002China

Th. electrocatalytic nitrogen reduction reaction(e-NRR)is a promising alternative meth.d for th. h.ber–Bosch.***,it still faces many ch.llenges in search.ng for h.gh.activity,stability,and selectivity catalysts and ascertaining th. catalytic mech.nism with.complete ***,a series of graph.ne-based N-bridged dual-atom catalysts(M1-N-M2/NC)are systematically investigated via first-principle calculation and a h.gh.th.ough.ut screening *** result unveils th.t N_(2) adsorption on M1-N-M2/NC in bridge-on adsorption mode can effectively break th. scaling relationsh.p on single-atom catalysts(SACs).Moreover,V-N-Ru/NC and V-N-Os/NC are systematically screened out as promising e-NRR catalysts,with.extremely low limiting potentials of-0.20 and-0.18 V,***,th. adsorption site competition between*N_(2) and*h.as well as th. competitive twin reactions of h.drogen evolution reaction(h.R)on intermediates(N_(n)h.(m))during th. e-NRR process,is systematically evaluated to form a remodeling insigh. for th. reactions in mech.nism,and th. e-NRR of new proposed dual-atom catalysts(DACs)is strategically optimized for its h.gh.efficiency performance potential via our remolding insigh. in e-NRR *** work provides new ideas and insigh.s for th. design and mech.nism of e-NRR catalysts and an effective strategy for rapidly screening h.gh.y efficient e-NRR catalysts.

关键词： nitrogen reduction dual-atom catalysts h.gh.th.ough.ut screening h.drogen evolution reaction density functional th.ory calculations