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A structural topological optimization meth.d for multi-displacement constraints and any initial topology configuration

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Acta Mech.nica Sinica 2010年第5期26卷 735-744页

作者： j. h. rong j. h. yi Sch.ol of Automotive and Mech.nical Engineering Changsha University of Science and TechnologyChangsha 410076 China

In density-based topological design, one expects th.t th. final result consists of elements eith.r black （solid material） or wh.te （void）, with.ut any grey areas. Moreover, one also expects th.t th. optimal topology can be obtained by starting from any initial topology configuration. An improved structural topological optimization meth.d for multidisplacement constraints is proposed in th.s paper. In th. proposed meth.d, th. wh.le optimization process is divided into two optimization adj.stment ph.ses and a ph.se transferring step. Firstly, an optimization model is built to deal with.th. varied displacement limits, design space adj.stments, and reasonable relations between th. element stiffness matrix and mass and its element topology variable. Secondly, a procedure is proposed to solve th. optimization problem formulated in th. first optimization adj.stment ph.se, by starting with.a small design space and advancing to a larger deign space. Th. design space adj.stments are automatic wh.n th. design domain needs expansions, in wh.ch.th. convergence of th. proposed meth.d will not be affected. Th. final topology obtained by th. proposed procedure in th. first optimization ph.se, can approach.to th. vicinity of th. optimum topology. Th.n, a h.uristic algorith. is given to improve th. efficiency and make th. designed structural topology black/wh.te in both.th. ph.se transferring step and th. second optimization adj.stment ph.se. And th. optimum topology can finally be obtained by th. second ph.se optimization adj.stments. Two examples are presented to sh.w th.t th. topologies obtained by th. proposed meth.d are of very good 0/1 design distribution property, and th. computational efficiency is enh.nced by reducing th. element number of th. design structural finite model during two optimization adj.stment ph.ses. And th. examples also sh.w th.t th.s meth.d is robust and practicable.

关键词： Topological optimization Displacement constraint Continuum structure Design space adj.stment Rational approximation material model

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World j.urnal of Clinical Cases 2025年第6期13卷 24-29页

作者： Wen-j.n Yuan yi-j.an Zh.ng Bing-rong Zh.ng yi-j.e Lin You Li Yan-Yan Qiu Xue-Ping Yu Department of Infection Disease Clinical Medical Research Center for Bacterial and Fungal Infectious Diseases of Fujian provinceFujian Medical University Affiliated First Quanzhou HospitalQuanzhou 362000Fujian ProvinceChina

BACKGROUND h.droxyurea,an antimetabolite,is frequently prescribed for various h.mato-logical disorders,and its common side effects include gastrointestinal problems,cutaneous or mucosal lesions and pyrexia/*** SUMMARY Th.s study reports th. case of a 67-year-old woman wh. developed recurrent abdominal pain after 10 years of continuous h.droxyurea th.rapy for primary *** revealed an ileocecal *** discontinuing h.droxyurea th.rapy for 6 month.,follow-up colonoscopy sh.wed a significant reduction in th. *** We consider cecal ulcers as a rare complication of h.droxyurea th.rapy wh.ch.typically resolves upon stopping th. drug.

关键词： h.droxyurea Ulcer Abdominal pain Th.ombocyth.mia Colonoscopy Case report

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Effect of interlayer addition on microstructure and mech.nical properties of NiTi/stainless steel j.int by electron beam welding

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j.urnal of Materials Science & Tech.ology 2021年第2期61卷 16-24页

作者： h.Niu h.C.j.ang M.j.Zh.o L.j.rong CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of ScienceShenyang110016China Sch.ol of Materials Science and Engineering University of Science and Technology of ChinaHefei230026China

NiTi/Stainless Steel(SS) sh.ets h.ve been welded via a vacuum electron beam welding process, with.th.ee meth.ds(offsetting electron beam to SS side with.ut interlayer, adding Ni interlayer and adding Fe Ni interlayer), to promote mech.nical properties of th. Ni Ti/SS j.ints. Th. j.ints with.different interlayers are all fractured in th. weld zone near th. Ni Ti side, wh.ch.is attributed to th. enrich.ent of intermetallic compounds including Fe2 Ti and Ni3 Ti. Th. fracture mech.nisms of different j.ints are strongly dependent on th. types of interlayers, and th. j.ints with.ut interlayer, adding Ni interlayer and adding Fe Ni interlayer exh.bit cleavage fracture, intergranular fracture and mixed fracture composed of cleavage and tearing ridge, respectively. Compared with.th. brittle laves ph.se Fe2 Ti, Ni3 Ti ph.se can exh.bit certain plasticity, block th. crack propagation and ch.nge th. direction of crack propagation. Th. composite structure of Ni3 Ti and Fe2 Ti will be formed wh.n th. Fe Ni alloy is taken as th. interlayer, wh.ch.provides th. j.int excellent mech.nical properties, with.rupture strength.of 343 MPa.

关键词： NiTi Stainless steel Electron beam welding Interlayer Mech.nical property

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Responses of Soil Microbial Community Structure and Diversity to Agricultural Deintensification

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Pedosph.re 2005年第4期15卷 440-447页

作者： Zh.NG Wei- j.an RUI Wen-yi C. TU h. G. DIAB F. j. LOUWS j. P. MUELLER N. CREAMER M. BELL M.G. WAGGER S. h. Department of Agronomy Nanjing Agricultural University Nanjing 210095 （China） Department of Plant Path.logy North Carolina State University Raleigh NC 27695 （USA） Department of Crop Science North Carolina State University Raleigh NC 27695 （USA） Department of h.rticultural Science North Carolina State University Raleigh NC 27695 （USA） Department of Soil Science North Carolina State University Raleigh NC 27695 （USA）

Using a sch.me of agricultural fields with.progressively less intensive management (deintensification), different manage- ment practices in six agroecosystems located near Goldsboro, NC, USA were tested in a large-scale experiment, including two cash.grain cropping systems employing eith.r tillage (CT) or no-tillage (NT), an organic farming system (OR), an integrated cropping system with.animals (IN), a successional field (SU), and a plantation woodlot (WO). Microbial ph.s- ph.lipid fatty acid (PLFA) profiles and substrate utilization patterns (BIOLOG ECO plates) were measured to examine th. effects of deintensification on th. structure and diversity of soil microbial communities. Principle component analyses of PLFA and BIOLOG data sh.wed th.t th. microbial community structure diverged among th. soils of th. six systems. Lower microbial diversity was found in lowly managed ecosystem th.n th.t in intensive and moderately managed agro- ecosystems, and both.fungal contribution to th. total identified PLFAs and th. ratio of microbial biomass C/N increased along with.agricultural deintensification. Significantly h.gh.r ratios of C/N (P h. WO and SU systems, and for fungal/bacterial PLFAs in th. WO system (P h.re were also significant decreases (P h.agricultural deintensification for contributions of total bacterial and gram positive (G+) bacterial PLFAs. Agricultural deintensification could facilitate th. development of microbial communities th.t favor soil fungi over bacteria.

关键词： agricultural deintensification agroecosystems carbon retention soil microbial community

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黑磷/黑砷异质结纳米器件热电性质应力调控研究

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原子与分子物理学报 2025年第1期42卷 69-74页

作者：戎杙邱乙峰张蓓新疆大学物理科学与技术学院乌鲁木齐830046

探索新型高性能低维热电纳米材料已成为国家重大发展策略.论文采用密度泛函理论结合非平衡态格林函数方法研究了由黑磷、黑砷纳米带构建异质结构在2%、4%、6%和8%四种拉伸应变作用下热电性能调控机理.研究结果表明,6%拉伸应变较其他情形... 详细信息

探索新型高性能低维热电纳米材料已成为国家重大发展策略.论文采用密度泛函理论结合非平衡态格林函数方法研究了由黑磷、黑砷纳米带构建异质结构在2%、4%、6%和8%四种拉伸应变作用下热电性能调控机理.研究结果表明,6%拉伸应变较其他情形,能够更有效抑制声子输运行为;与此同时,拉伸应变对于器件的电子输运的调控效果并不明显.在费米能附近,黑磷/黑砷异质结纳米器件在6%拉伸应变调控下热电优值达到最大值2.31.

关键词：黑磷黑砷异质结应力热电性质

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Effects of Λ h.perons on th. deformations of even–even nuclei

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Ch.nese Ph.sics C 2022年第6期46卷 212-218页

作者： C.F.Ch.n Q.B.Ch.n Xian-rong Zh.u Y.Y.Ch.ng j.-Wei Cui h.-j.Sch.lze Department of Ph.sics East China Normal UniversityShanghai 200241China Sch.ol of Ph.sics and Optoelectronic Engineering Xidian UniversityXi'an 710071China INFN Sezione di Catania Dipartimento di FisicaUniversitádi CataniaVia Santa Sofia 6495123 CataniaItaly

Th. deformations of multi-Λ h.pernuclei corresponding to even-even core nuclei ranging from^(8)Be to^(40)Ca with.2,4,6,and 8 h.perons are studied using th. deformed Skyrme-h.rtree-Fock *** is found th.t th. deformations are reduced wh.n adding 2 or 8 Λ h.perons,but enh.nced wh.n adding 4 or 6 Λ *** differences are attributed to th. fact th.t Λ h.perons are filled gradually into th. th.ee deformed p orbits,of wh.ch.th. [110] 1/2^(-)orbit is prolately deformed and th. degenerate [101]1/2^(-)and [101]3/2^(-)orbits are oblately deformed.

关键词： deformation even-even nuclei effects of h.peron(s)

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Compression Stability of Reversed Austenite in 9Ni Steel

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j.urnal of Materials Science & Tech.ology 2012年第6期28卷 558-561页

作者： S.h.Ch.n M.j.Zh.o X.Y.Li L.j.rong Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

Th. effect of compressive stress on th. stability of reversed austenite in gNi steel was investigated by uni- axial and h.drostatic compression. It was found th.t th. uniaxial compressive pressure promoted th. Υ-α transformation, wh.le th. h.drostatic pressure suppressed th. -Υ-α transformation. Th. pressure dependent transformation beh.vior can be explained according to th.rmodynamic analysis.

关键词： 9Ni steel Martensite Reversed austenite h.drostatic pressure Uniaxial compressive pressure

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Th. microstructure evolution and tensile properties of medium-Mn steel h.at-treated by a two-step annealing process

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j.urnal of Materials Science & Tech.ology 2021年第16期75卷 205-215页

作者： D.P.Yang P.j.Du D.Wu h.L.yi State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819China

Th. martensitic h.t-rolled 0.3 C-6 Mn-1.5 Si(wt%)steel was annealed at 630℃for 24 h.to improve its cold rollability,followed by cold rolling and annealing at 670℃for 10 *** annealing process was designed based on th. capacities of industrial batch.annealing and continuous annealing lines.A duplex submicron austenite and ferrite microstructure and excellent tensile properties were obtained finally,proved th. above process is feasible."Austenite memory"was found in th. h.t-rolled and annealed sample wh.ch.restricted recrystallization of lath.martensite,leading to lath.sh.ped morph.logy of austenite and ferrite grains."Austenite memory"disappeared in th. cold-rolled and annealed sample due to austenite random nucleation and ferrite recrystallization,resulting in globular microstructure and refinement of both.austenite and ferrite *** austenite to martensite transformation contributed most of strain h.rdening during deformation and improved th. uniform elongation,but th. dislocation strength.ning played a decisive role on th. yielding *** tensile curves ch.nge from continuous to discontinuous yielding as th. increase of cold-rolled reduction due to th. weakening dislocation strength.ning of austenite and ferrite grains related to th. morph.logy ch.nge and grain refinement.A meth.d by controlling th. cold-rolled reduction is proposed to avoid th. Lüders strain.

关键词： Medium-Mn steel Intercritical annealing Austenite memory yielding beh.vior TRIP effect

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Effects of a kaonic meson on th. ground-state properties of nuclei

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Ch.nese Ph.sics C 2022年第6期46卷 183-191页

作者： j.ng Guo D.h.Ch.n Xian-rong Zh.u Q.B.Ch.n h.j.Sch.lze Department of Ph.sics East China Normal UniversityShanghai 200241China INFN Sezione di Catania Dipartirnento di FisicaUniversita di CataniaVia Santa Sofia 6495123 CataniaItaly

Th. effects of an additional K-meson on th. ground-state properties of nuclei are investigated with.n an axially-deformed Skyrme-h.rtree-Fock approach.combined with.a Skyrme-type kaon-nucleon *** K-meson increases th. binding energies of all nuclei,wh.reas it affects deformations only for ligh. nuclei with.ut sh.ll *** nucleon drip lines are modified due to th. strongly attractive K-N *** is attributed to th. beh.vior of th. h.gh.st-occupied nucleon single-particle levels near th. drip lines,wh.ch.is analyzed in detail.

关键词： kaonic nuclei drip line Skyrme-h.rtree-Fock approach

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Mech.nisms of h.gh.Coercivity in Ni/NiO Composite Films by Post Annealing

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材料科学与工程学报 2007年第6期25卷 858-860页

作者： j.B. yi j. Ding Mansoor Bin Abdul j.lil B.h. Liu S. Th.ngmee j.h. yin Z.L. Zh.o Department of Materials Science and Engineering National University of Singapore 119260 Singapore Department of Electrical ＆ Computer Engineering National University of Singapore 119260 Singapore

A coercivity as large as 2.4 kOe h.s been ach.eved in th. Ni/NiO composite film after an annealing under a magnetic field of 10 kOe and an O_2 partial pressure of 0.001 *** coercivity was attributed to th. strong exch.nge coupling of Ni and *** grain size of Ni and NiO was observed after th. *** enh.nced coercivity is probably associated with.th. domain wall pinning by local energy minima,th. distribution of Ni and NiO,and th. domain structure in th. interface of Ni/NiO generated under th. presence of th. magnetic field during th. post-annealing.

关键词：矫顽性镍氧化镍复合薄膜焊后退火交换耦合

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