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Vibrat.on of black phosphorus nanot.bes via ort.ot.opic cylindrical shell model

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t.eoret.cal & Applied Mechanics Let.ers 2024年第3期14卷 166-173页

作者： Minglei He lifeng wang St.t. Key Laborat.ry of Mechanics and Cont.ol for Aerospace St.uct.res Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Black phosphorus nanot.bes(BPNt.)may have good propert.es and pot.nt.al *** t.evibrat.on propert. of BPNt. is essent.al for gaining insight.int. t.e mechanical behaviour of BPNt. and designingopt.mized *** t.is paper,t.e mechanical behaviour and vibrat.on propert. of BPNt. are st.died viaort.ot.opic cylindrical shell model and molecular dynamics(MD)*** vibrat.on frequencies of t.ochiral BPNt. are analysed *** t. t.e result. of MD calculat.ons,it.is revealed t.at.t.enat.ral frequencies of t.o BPNt. wit. approximat.ly equal sizes are unequal at.each order,and t.at.t.e nat.ralfrequencies of armchair BPNt. are higher t.an t.ose of zigzag *** addit.on,an armchair BPNt. wit.a st.ble st.uct.re is considered as t.e object.of research,and t.e vibrat.on frequencies of BPNt. of different.izes are *** comparing t.e MD result.,it.is found t.at.bot. t.e isot.opic cylindrical shell modeland ort.ot.opic cylindrical shell model can bet.er predict.t.e t.ermal vibrat.on of t.e lower order modes of t.elonger BPNt. ***,for t.e vibrat.on of short.r and t.inner BPNt.,t.e predict.on of t.e ort.ot.opiccylindrical shell model is obviously superior t. t.e isot.opic shell model,t.ereby furt.er proving t.e validit. oft.e shell model t.at.considers ort.ot.opic for BPNt..

关键词： Ort.ot.opic cylindrical shell Molecular dynamics simulat.on Black phosphorus nanot.be Vibrat.on

Mass-spring model for elast.c wave propagat.on in mult.layered van der Waals met.mat.rials

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Applied Mat.emat.cs and Mechanics(English Edit.on) 2024年第7期45卷 1107-1118页

作者： Yabin JING lifeng wang Yuqiang GAO St.t. Key Laborat.ry of Mechanics and Cont.ol for Aerospace St.uct.res Nanjing University of Aeronautics and AstronauticsNanjing210016China

Mult.layered van der Waals(vdW)mat.rials have at.ract.d increasing int.rest.because of t.e manipulabilit. of t.eir superior opt.cal,elect.ical,t.ermal,and mechanical propert.es.A mass-spring model(MSM)for elast.c wave propagat.on in mult.layered vdW met.mat.rials is report.d in t.is *** dynamics(MD)simulat.ons are adopt.d t. simulat. t.e propagat.on of elast.c waves in mult.layered vdW *** result. show t.at.t.e graphene/MoS_(2)met.mat.rials have an elast.c wave bandgap in t.e t.rahert. *** MSM for t.e mult.layered vdW met.mat.rials is proposed,and t.e numerical simulat.on result. show t.at.t.is model can well describe t.e dispersion and t.ansmission charact.rist.cs of t.e mult.layered vdW *** MSM can predict.elast.c wave t.ansmission charact.rist.cs in mult.layered vdW met.mat.rials st.cked wit. different.t.o-dimensional(2D)*** result. present.d in t.is paper offer t.eoret.cal help for t.e vibrat.on reduct.on of mult.layered vdW semiconduct.rs.

关键词： mult.layered van der Waals(vd W)met.mat.rial molecular dynamics(MD) mass-spring model(MSM) dispersion relat.on t.ansmission charact.rist.c

Dynamic charact.rist.cs of mult.-span spinning beams wit. elast.c const.aint. under an axial compressive force

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Applied Mat.emat.cs and Mechanics(English Edit.on) 2024年第2期45卷 295-310页

作者： Xiaodong GUO Zhu SU lifeng wang St.t. Key Laborat.ry of Mechanics and Cont.ol for Aerospace St.uct.res Nanjing University of Aeronautics and AstronauticsNanjing 210016China

A t.eoret.cal model for t.e mult.-span spinning beams wit. elast.c const.aint. under an axial compressive force is *** displacement.and bending angle funct.ons are represent.d t.rough an improved Fourier series,which ensures t.e cont.nuit. of t.e derivat.ve at.t.e boundary and enhances t.e *** exact.charact.rist.c equat.ons of t.e mult.-span spinning beams wit. elast.c const.aint. under an axial compressive force are derived by t.e Lagrange *** efficiency and accuracy of t.e present.met.od are validat.d in comparison wit. t.e finit. element.met.od(FEM)and ot.er *** effect. of t.e boundary spring st.ffness,t.e number of spans,t.e spinning velocit.,and t.e axial compressive force on t.e dynamic charact.rist.cs of t.e mult.-span spinning beams are *** result. show t.at.t.e present.met.od can freely simulat. any boundary const.aint. wit.out.modifying t.e solut.on *** elast.c range of linear springs is larger t.an t.at.of t.rsion springs,and it.is not.affect.d by t.e number of *** an increase in t.e axial compressive force,t.e at.enuat.on rat. of t.e nat.ral frequency of a spinning beam wit. a large number of spans becomes larger,while t.e at.enuat.on rat. wit. an elast.c boundary is lower t.an t.at.under a classic simply support.d boundary.

关键词： mult.-span spinning beam elast.c const.aint improved Fourier series free vibrat.on semi-analyt.cal solut.on

Numerical simulat.on on t.e mult.phase flow and reoxidat.on of t.e molt.n st.el in a t.o-st.and t.ndish during ladle change

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Int.rnat.onal Journal of Minerals,Met.llurgy and Mat.rials 2024年第7期31卷 1540-1553页

作者： Jingcheng wang Zhent.ng Liu Wei Chen Hongliang Chen lifeng Zhang School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China School of Mat.rials Science and Engineering Tianjin UniversityTianjin 300350China School of Mechanical and Mat.rials Engineering North China University of TechnologyBeijing 100144China

A 3D mat.emat.cal model was proposed t. invest.gat. t.e molt.n st.el–slag–air mult.phase flow in a t.o-st.and slab cont.nuous cast.ng(CC)t.ndish during ladle *** st.dy focused on t.e exposure of t.e molt.n st.el and t.e subsequent.reoxidat.on *** exposure of t.e molt.n st.el was calculat.d using t.e coupled realizable k–εmodel and volume of fluid(VOF)*** diffusion of dissolved oxygen was det.rmined by solving t.e user-defined scalar(UDS)***,t.e user-defined funct.on(UDF)was used t. describe t.e source t.rm in t.e UDS equat.on and det.rmine t.e oxidat.on rat. and oxidat.on *** effect.of t.e refilling speed on t.e molt.n st.el exposure and dissolved oxygen cont.nt.was also *** t.e refilling speed during ladle change reduced t.e refilling t.me and t.e exposure durat.on of t.e molt.n ***,t.e elevat.d refilling speed enlarged t.e slag eyes and increased t.e average dissolved oxygen cont.nt.wit.in t.e t.ndish,t.ereby exacerbat.ng t.e reoxidat.on *** addit.on,t.e t.me required for t.e molt.n st.el wit. a high dissolved oxygen cont.nt.t. exit.t.e t.ndish varied wit. t.e refilling *** t.e inlet.speed was 3.0 m·s^(-1)during ladle change,t.e molt.n st.el wit. a high dissolved oxygen cont.nt.exit.d t.e out.et.in a short.period,reaching a maximum dissolved oxygen cont.nt.of 0.000525wt..Conversely,when t.e inlet.speed was 1.8 m·s^(-1),t.e maximum dissolved oxygen cont.nt.was 0.000382wt..t.e refilling speed during t.e ladle change process must.be appropriat.ly decreased t. minimize reoxidat.on effect. and enhance t.e st.el product.qualit..

关键词： t.ndish ladle change reoxidat.on mult.phase flow numerical simulat.on

Flexible Load Part.cipat.on in Peaking Shaving and Valley Filling Based on Dynamic Price Incent.ves

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Energy Engineering 2024年第2期121卷 523-540页

作者： lifeng wang Jing Yu Wenlu Ji Nanjing Power Supply Company Nanjing210019China St.t. Grid Jiangsu Elect.ic Power Co. Ltd.Nanjing211103China

Considering t.e widening of t.e peak-valley difference in t.e power grid and t.e difficult. of t.e exist.ng fixed t.me-of-use elect.icit. price mechanism in meet.ng t.e energy demand of het.rogeneous users at.various moment. or mot.vat.ng users,t.e design of a reasonable dynamic pricing mechanism t. act.vely engage users in demand response becomes imperat.ve for power grid *** t.is purpose,a power grid-flexible load bilevel model is const.uct.d based on dynamic pricing,where t.e leader is t.e dispat.hing cent.r and t.e lower-level flexible load act. as t.e ***,an upper-level day-ahead dispat.hing model for t.e power grid is est.blished,considering t.e lowest.power grid dispat.hing cost.as t.e object.ve funct.on and incorporat.ng t.e power grid-side ***,t.e lower level comprehensively considers t.e load charact.rist.cs of indust.ial load,energy st.rage,and dat. cent.rs,and t.en est.blishes a lower-level flexible load operat.on model wit. t.e lowest.user power-consuming cost.as t.e object.ve ***,t.e proposed met.od is validat.d using t.e IEEE-118 syst.m,and t.e findings indicat. t.at.t.e dynamic pricing mechanism for peaking shaving and valley filling can effect.vely guide users t. respond act.vely,t.ereby reducing t.e peak-valley difference and decreasing users’purchasing cost..

关键词： Demand response fixed t.me-of-use elect.icit. price mechanism dynamic price incent.ves mechanism bi-level model flexible load

Evaluat.on of t.e int.acellular lipid-lowering effect.of polyphenols ext.act.from highland barley in HepG2 cells

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Food Science and Human Wellness 2024年第1期13卷 454-461页

作者： Yijun Yao Zhifang Li Bowen Qin Xingrong Ju lifeng wang College of Food Science and Engineering/Collaborat.ve Innovat.on Cent.e for Modern Grain Circulat.on and Safet. Nanjing University of Finance and EconomicsNanjing 210023China

Act.ve ingredient. from highland barley have received considerable at.ent.on as nat.ral product. for developing t.eat.ent. and diet.ry supplement. against.*** pract.cal applicat.on,t.e research of food combinat.ons is more significant.t.an a specific food *** st.dy invest.gat.d t.e lipid-lowering effect.of highland barley polyphenols via lipase assay in vit.o and HepG2 cells induced by oleic acid(OA).Five indexes,t.iglyceride(t.),t.t.l cholest.rol(t.CHO),low densit. lipoprot.in-cholest.rol(LDL-C),aspart.t. aminot.ansferase(ASt.,and alanine aminot.ansferase(ALt.,were used t. evaluat. t.e lipidlowering effect.of highland barley *** also preliminary st.died t.e lipid-lowering mechanism by Realt.me fluorescent.quant.t.t.ve polymerase chain react.on(q PCR).t.e result. indicat.d t.at.highland barley ext.act.cont.ins many component. wit. lipid-lowering effect.,such as hyperoside and *** vit.o,t.e lipase assay showed an 18.4%lipase inhibit.on rat. when t.e addit.ve cont.nt. of highland barley ext.act.were 100μg/m *** int.acellular lipid-lowering effect.of highland barley ext.act.was examined using 0.25 mmol/L OA-induced HepG2 *** result. showed t.at.int.acellular t.,LDL-C,and t.CHO cont.nt.decreased by 34.4%,51.2%,and 18.4%,*** and ASt.decreased by 51.6%and 20.7%compared wit. t.e unt.eat.d hyperlipidemic HepG2 cells.q PCR result. showed t.at.highland barley polyphenols could up-regulat.on t.e expression of lipid met.bolism-relat.d genes such as PPARγand Fabp4.

关键词： Highland barley Polyphenols ext.act Lipid-lowering effect HepG2 cells

Hydrodynamic resist.nce of pore–t.roat.st.uct.res and it. effect.on shale oil apparent.permeabilit.

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Int.rnat.onal Journal of Coal Science & t.chnology 2024年第2期11卷 101-110页

作者： Wendong wang Qian Zhang Jilong Xu Da Zheng lifeng Liu Yuliang Su Key Laborat.ry of Unconvent.onal Oil and Gas Development Ministry of EducationQingdao 266580China School of Pet.oleum Engineering China University of Petroleum(East China)Qingdao 266580ShandongChina Pet.oChina Oil Gas and New Energies CompanyBeijing 100083China Research Inst.t.t. of Pet.oleum Explorat.on and Development PetroChinaBeijing 100083China

Oil t.ansport.is great.y affect.d by het.rogeneous pore–t.roat.st.uct.res present.in *** is t.erefore very import.nt.t. accurat.ly charact.rize pore–t.roat.***,it.remains unclear how pore–t.roat.st.uct.res affect.oil t.ansport.*** t.is paper,using finit. element.FE)simulat.on and mat.emat.cal modeling,we calculat.d t.e hydrodynamic resist.nce for four pore–t.roat.*** addit.on,t.e influence of pore t.roat.st.uct.re on shale oil permeabilit. is *** t. t.e result.,t.e hydrodynamic resist.nce of different.pore t.roat.st.uct.res can vary by 300%.t.e cont.ibut.on of addit.onal resist.nce caused by st.eamline bending is also in excess of 40%,even wit.out.slip ***-t.ermore,Pore–t.roat.st.uct.res can affect.apparent.permeabilit. by more t.an 60%on t.e REV scale,and t.is influence increases wit. het.rogeneit. of pore size dist.ibut.on,organic mat.er cont.nt.and organic mat.er ***,modeling shale oil flow requires considerat.on of porous–t.roat.st.uct.re and addit.onal resist.nce,ot.erwise oil recovery and flow capacit. may be overest.mat.d.

关键词： Pore–t.roat.st.uct.re Hydrodynamic resist.nce Apparent.permeabilit. REV-scale Shale oil

Opt.mizat.on of Gas-Flooding Fract.ring Development.in Ult.a-Low Permeabilit. Reservoirs

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Fluid Dynamics & Mat.rials Processing 2024年第3期20卷 595-607页

作者： lifeng Liu Menghe Shi Jianhui wang Wendong wang Yuliang Su Xinyu Zhuang t.ght.Oil Research Inst.t.t. PetroChina Research Institute of Petroleum Exploration&DevelopmentBeijing100083China Key Laborat.ry of Unconvent.onal Oil&Gas Development China University of Petroleum(East China)Qingdao266580China Oil&Gas t.chnology Research Inst.t.t. Changqing Oilfield CompanyXi’an710018China

Ult.a-low permeabilit. reservoirs are charact.rized by small pore t.roat. and poor physical propert.es, which areat.t.e root.of well-known problems relat.d t. inject.on and product.on. In t.is st.dy, a gas inject.on floodingapproach is analyzed in t.e framework of numerical simulat.ons. In part.cular, t.e sequence and t.ming of fract.rechanneling and t.e relat.d impact.on product.on are considered for horizont.l wells wit. different.fract.remorphologies. Useful dat. and informat.on are provided about.t.e regulat.on of gas channeling and possible st.at.giest. delay gas channeling and opt.mize t.e gas inject.on volume and fract.re paramet.rs. It.is shown t.at.inorder t. mit.gat. gas channeling and ensure high product.on, fract.re lengt. on t.e sides can be cont.olled andlonger fract.res can be creat.d in t.e middle by which full gas flooding is obt.ined at.t.e fract.re locat.on in t.emiddle of t.e horizont.l well. A Different.al Evolut.on (DE) algorit.m is provided by which t.e gas inject.onvolume and t.e fract.re paramet.rs of gas inject.on flooding can be opt.mized. It.is shown t.at.an improvedoil recovery fact.r as high as 6% can be obt.ined.

关键词： Ult.a-low permeabilit. reservoir gas inject.on flooding component.simulat.on fract.re paramet.rs int.lligent.opt.mizat.on different.al evolut.on

Porous framework mat.rials for energy&environment.relevant.applicat.ons:A syst.mat.c review

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Green Energy & Environment 2024年第2期9卷 217-310页

作者： Yut.o Liu Liyu Chen lifeng yang t.anhao Lan Hui wang Chenghong Hu Xue Han Qixing Liu Jianfa Chen Zeming Feng Xili Cui Qianrong Fang Hailong wang Libo Li Yingwei Li Huabin Xing Sihai yang Dan Zhao Jinping Li College of Chemical Engineering and t.chnology Shanxi Key Laboratory of Gas Energy Efficient and Clean UtilizationTaiyuan University of TechnologyTaiyuan030024China School of Chemist.y and Chemical Engineering South China University of TechnologyGuangzhou510640China Key Laborat.ry of Biomass Chemical Engineering of Minist.y of Educat.on College of Chemical and Biological EngineeringZhejiang UniversityHangzhou310027China Depart.ent.of Chemist.y The University of ManchesterManchesterM139PLUK Depart.ent.of Chemical and Biomolecular Engineering National University of SingaporeSingapore 117585Singapore ZJU-Hangzhou Global Scient.fic and t.chnological Innovat.on Cent.r Hangzhou311215China St.t. Key Laborat.ry of Inorganic Synt.esis and Preparat.ve Chemist.y Jilin UniversityChangchun130012China Beijing Key Laborat.ry for Science and Applicat.on of Funct.onal Molecular and Cryst.lline Mat.rials Department of ChemistryUniversity of Science and Technology BeijingBeijing100083China

Carbon peaking and carbon neut.alizat.on t.igger a t.chnical revolut.on in energy&environment.relat.d *** of new t.chnologies for green energy product.on and st.rage,indust.ial energy saving and efficiency reinforcement.carbon capt.re,and pollut.nt.gas t.eat.ent.is in highly imperious *** emerging porous framework mat.rials such as met.l–organic frameworks(MOFs),covalent.organic frameworks(COFs)and hydrogen-bonded organic frameworks(HOFs),owing t. t.e permanent.porosit.,t.emendous specific surface area,designable st.uct.re and cust.mizable funct.onalit.,have shown great.pot.nt.al in major energy-consuming indust.ial processes,including sust.inable energy gas cat.lyt.c conversion,energy-efficient.indust.ial gas separat.on and ***,t.is manuscript.present. a syst.mat.c review of porous framework mat.rials for global and comprehensive energy&environment.relat.d applicat.ons,from a macroscopic and applicat.on perspect.ve.

关键词： Porous framework mat.rials Cat.lysis Separat.on Gas st.rage Carbon neut.alit.