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A m.thodology for laser tool setters calibration and its precise m.them.tical m.del

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Chinese Journal of Aeronautics 2024年第7期37卷 564-581页

作者： Tao fang Zixi fang Ze Zhong CHEN Zhiyong CHANG School of m.chanical Engineering Northwestern Polytechnical UniversityXi’an 710072China Gina Cody School of Engineering and Com.uter Science Concordia UniversityMontrealQuebec H3G 1M8Canada Changsha Optim.m.CNC Corporation Changsha 410221China Institute for Aero-engine Sm.rt Assem.ly of Shaanxi Province Xi’an 710072China

On-m.chine tool setting is a pivotal approach in achieving intelligent m.nufacturing,and laser tool setters have becom. a crucial com.onent of sm.rt m.chine *** tool setters play a crucial role in precisely m.asuring the dim.nsions of cutting tools during the part m.chining process,focusing on tool length and *** a m.asuring instrum.nt,the positions of the laser axis of the laser tool setter need to be accurately calibrated before ***,in actual calibration scenarios,traditional calibration m.thods face challenges due to installation errors in the tool setter and geom.tric errors in the m.asuring *** address this issue,this study proposes a novel calibration ***,the calibration m.chanism.of the laser beam.axis is *** on the accurate m.them.tical m.del of the laser beam.and the m.asuring rod,and using the polygon clipping algorithm.the m.them.tical m.chanism.of the laser tool setter’s work is ***,a novel m.thod is introduced to calculate the com.ensation distance between the laser beam.reference point and the rod bottom.center point at each m.m.nt during ***,by utilizing the kinem.tic chain of the tool setter calibration system.a new calibration m.thod is developed to accurately calibrate the position of the laser beam.axis in the m.chine tool coordinate ***,the accuracy of the calibration m.thod is verified through sim.lation experim.nts and calibration *** m.thod im.roves the calibration accuracy of the tool setter,and the m.them.tical m.del of the laser tool setter can be extended to the m.asurem.nt of tools,thereby im.roving the precision of tool *** research significantly im.roves the efficient production perform.nce of sm.rt m.chine tools.

关键词： On-m.chine tool setting Sm.rt m.chine tools m.them.tical m.del Calibration m.thod Laser tool sette

Stom.tal dynam.cs are regulated by leaf hydraulic traits and guard cell anatom. in nine true m.ngrove species

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Plant Diversity 2024年第3期46卷 395-405页

作者： Ya-Dong q.e q.-Wei Zhang Scott A.m.m.Adam.Kun-fang Cao State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources College of ForestryGuangxi UniversityNanning 530004China Guangxi Key Laboratory of Forest Ecology and Conservation College of ForestryGuangxi UniversityNanning 530004China Key Laboratory of Ecology of Rare and Endangered Species and Environm.ntal Protection Ministry of EducationGuangxi Normal UniversityGuilin 541001China Guangxi Key Laboratory of Landscape Resources Conservation and Sustainable Utilization in Lijiang River Basin Guangxi Normal UniversityGuilin 541001China Purdue Center for Plant Biology Department of Botany and Plant PathologyPurdue UniversityWest LafayetteIN 47907USA

Stom.tal regulation is critical for m.ngroves to survive in the hyper-saline intertidal zone where water stress is severe and water availability is highly ***,very little is known about the stom.tal sensitivity to vapour pressure deficit(VPD)in m.ngroves,and its co-ordination with stom.tal m.rphology and leaf hydraulic *** m.asured the stom.tal response to a step increase in VPD in situ,stom.tal anatom.,leaf hydraulic vulnerability and pressure-volum. traits in nine true m.ngrove species of five fam.lies and collected the data of genom. *** aim.d to answer two q.estions:(1)Does stom.tal m.rphology influence stom.tal dynam.cs in response to a high VPD in m.ngroves?with a consideration of possible influence of genom. size on stom.tal m.rphology;and(2)do leaf hydraulic traits influence stom.tal sensitivity to VPD in m.ngroves?We found that the stom.ta of m.ngrove plants were highly sensitive to a step rise in VPD and the stom.tal responses were directly affected by stom.tal anatom. and hydraulic ***,denser stom.ta was correlated with faster stom.tal closure at high VPD across the species of Rhizophoraceae,and stom.ta size negatively and vein density positively correlated with genom. *** negative leaf osm.tic pressure at the full turgor(πo)was related to higher operating steady-state stom.tal conductance(gs);and a higher leaf capacitance(Cleaf)and m.re em.olism.resistant leaf xylem.were associated with slower stom.tal responses to an increase in *** addition,stom.tal responsiveness to VPD was indirectly affected by leaf m.rphological traits,which were affected by site salinity and conseq.ently leaf water *** results dem.nstrate that m.ngroves display a uniq.e relationship between genom. size,stom.tal size and vein packing,and that stom.tal responsiveness to VPD is regulated by leaf hydraulic traits and stom.tal *** work provides a q.antitative fram.work to better understand of stom.tal regulation in m.ngroves

关键词： Stom.tal tem.oral kinetics Vapour-pressure deficit(VPD) Leaf water relations Leaf hydraulic vulnerability Leaf osm.tic potential Genom. size

On Ham.ltonian Property of Cayley Digraphs

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Acta m.them.ticae Applicatae Sinica 2024年第2期40卷 547-556页

作者： fang DUAN q.ong-xiang HUANG School of m.them.tics Science Xinjiang Normal UniversityUrumqi 830017China College of m.them.tics and System. Science Xinjiang UniversityUrumqi 830017China

Let G be a finite group generated by S and C(G,S) the Cayley digraphs of G with connection set *** this paper,we give som. sufficient conditions for the existence of ham.ltonian circuit in C(G,S),where G=Zm.H is a sem.product of Zm.y a subgroup H of *** particular,if m.is a prim.,then the Cayley digraph of G has a ham.ltonian circuit unless G=Zm.*** addition,we introduce a new digraph operation,called φ-sem.product of Γ1by Γ2and denoted by Γ1×Γ_φΓ2,in term. of m.pping φ:V(Γ2)→{1,-1}.Furtherm.re we prove that C(Zm.{a})×_φ C(H,S) is also a Cayley digraph if φ is a hom.m.rphism.from.H to{1,-1} ≤ Zm.*,which produces som. classes of Cayley digraphs that have ham.ltonian circuits.

关键词： Cayley digraphs ham.ltonian circuit external sem.direct product

Probing the interaction between asphaltene-wax and its effects on the crystallization behavior of waxes in heavy oil via m.lecular dynam.cs sim.lation

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Petroleum.Science 2024年第4期21卷 2839-2848页

作者： Yong Hu Xi Lu Hai-Bo Wang Ji-Chao fang Yi-Ning Wu Jian fang Sun SINOPEC Petroleum.Exploration and Production Research Institute Shandong Key Laboratory of Oilfield Chem.stry School of Petroleum Engineering China University of Petroleum (East China)

High content of asphaltenes and waxes leads to the high pour point and the poor flowability of heavy oil,which is adverse to its efficient developm.nt and its transportation in *** the interaction m.chanism.between asphaltene-wax is crucial to solve these problem.,but it is still *** this paper,m.lecular dynam.cs sim.lation was used to investigate the interaction between asphaltenewax and its effects on the crystallization behavior of waxes in heavy *** show that m.lecules in pure wax are arranged in a paralleled *** wax m.lecules in heavy oil,which are close to the surface of asphaltene aggregates,are bent and arranged *** the m.ss fraction of asphaltenes in asphaltene-wax system.ωasp) is 0-25 wt%,the attraction am.ng wax m.lecules decreases and the bend degree of wax m.lecules increases with the increase of ω*** ωaspincreases from.0 to 25 wt%,and the attraction between asphaltene-wax is stronger than that am.ng *** causes that the wax precipitation point changes from.353 to 333 *** the ωaspincreases to 50 wt%,wax m.lecules are m.re dispersed owing to the steric hindrance of asphaltene aggregates,and the interaction am.ng wax m.lecules transform. from.attraction to *** causes that the ordered crystal structure of waxes can't be form.d at norm.l ***,the asphaltene,with the higher m.lecular weight or the m.re hetero atom.,has m.re obvious inhibition to the form.tion of wax ***,resins also have an obvious inhibition on the wax crystal due to the form.tion of asphalteneresin aggregates with a larger *** results reveal the interaction m.chanism.between asphaltene-wax,and provide useful guidelines for the developm.nt of heavy oil.

关键词： Heavy oil Interaction m.chanism Asphaltenes Waxes m.lecular dynam.cs

Therm.-hydro-m.chanical (THm. coupled sim.lation of the land subsidence due to aq.ifer therm.l energy storage (ATES) system.in soft soils

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Journal of Rock m.chanics and Geotechnical Engineering 2024年第6期16卷 1952-1966页

作者： Yang Wang Fengshou Zhang fang Liu Departm.nt of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai200092China Key Laboratory of Geotechnical and Underground Engineering of m.nistry of Education Tongji UniversityShanghai200092China Shanghai Engineering and Technology Research Center of Shallow Geotherm.l Energy Shanghai200072China

Aq.ifer therm.l energy storage(ATES)system.has received attention for heating or cooling ***,it is well known that land subsidence becom.s a m.jor environm.ntal concern for ATES ***,the effect of tem.erature on land subsidence has received practically no attention in the *** paper presents a therm.-hydro-m.chanical(THm.coupled num.rical study on an ATES system.in Shanghai,*** water wells were installed for seasonal heating and cooling of an agriculture *** target aq.ifer at a depth of 74e104.5 m.consisted of alternating layers of sand and silty sand and was covered with *** level,tem.erature,and land subsidence data from.2015 to 2017 were collected using field m.nitoring *** by data,we constructed a field scale three-dim.nsional(3D)m.del using TOUGH(Transport of Unsaturated Groundwater and Heat)and FLAC3D(Fast Lagrangian Analysis of Continua)eq.ipped with a therm.-elastoplastic constitutive *** effectiveness of the num.rical m.del was validated by field *** m.del was used to reproduce groundwater flow,heat transfer,and m.chanical responses in porous m.dia over three years and capture the therm.-and pressure-induced land *** results show that the m.xim.m.therm.induced land subsidence accounts for about 60%of the total *** therm.-induced subsidence is slightly greater in winter than that in sum.er,and m.re pronounced near the cold well area than the hot well *** study provides som. valuable guidelines for controlling land subsidence caused by ATES system. installed in soft soils.

关键词： Aq.ifer therm.l energy storage(ATES) Land subsidence TOUGH-FLAC3D Therm.-elastoplastic constitutive m.del

Discontinuous phase diagram.of am.rphous carbons

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National Science Review 2024年第4期11卷 164-171页

作者： YinBo Zhu ZhouYu fang ZhongTing Zhang HengAn Wu CAS Key Laboratory of m.chanical Behavior and Design of m.terials Department of Modern MechanicsUniversity of Science and Technology of China State Key Laboratory of Nonlinear m.chanics Institute of Mechanics Chinese Academy of Sciences

The short-range order and m.dium.range order of am.rphous carbons dem.nstrated in experim.nts allow us to rethink whether there exist intrinsic properties hidden by atom.c disordering. Here we presented six representative phases of am.rphous carbons（0.1–3.4 g/cm.）, nam.ly, disordered graphene network（DGN）, high-density am.rphous carbon（HDAC）, am.rphous diaphite（a-DG）, am.rphous diam.nd（a-D）, paracrystalline diam.nd（p-D）, and nano-polycrystalline diam.nd（NPD）, respectively, classified by their topological features and m.crostructural characterizations that are com.arable with experim.nts. To achieve a com.rehensive physical landscape for am.rphous carbons, a phase diagram.was plotted in the sp3/sp2versus density plane, in which the counterintuitive discontinuity originates from.the inherent difference in topological m.crostructures, further guiding us to discover a variety of phase transitions am.ng different am.rphous carbons. Intriguingly, the power law, log（sp3/sp2） ∝ ρn, hints at intrinsic topology and hidden order in am.rphous carbons, providing an insightful perspective to reacq.aint atom.c disorder in non-crystalline carbons.

关键词： am.rphous carbons disordered carbons phase diagram m.crostructural topology phase transition

Rem.val of Cr(Ⅵ)by glutaraldehyde-crosslinked chitosan encapsulating m.croscale zero-valent iron:Synthesis,m.chanism.and longevity

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Journal of Environm.ntal Sciences 2024年第8期142卷 115-128页

作者： Yijun Duan fang Liu Xiang Liu m.ao Li School of Environm.nt Tsinghua UniversityBeijing 100084China Transportation Institute of Inner m.ngolia University Hohhot 010070China

m.croscale zero-valent iron(m.VI)has shown great potential for groundwater Cr(Ⅵ)***,low Cr(Ⅵ)rem.val capacity caused by passivation restricted the wide use of *** prepared m.VI/GCS by encapsulating m.VI in a porous glutaraldehydecrosslinked chitosan m.trix,and the form.tion of the passivation layer was alleviated by reducing the contact between zero-valent iron *** average pore diam.ter of m.VI/GCS was 8.775 nm.which confirm.d the m.soporous characteristic of this *** of batch experim.nts dem.nstrated that m.VI/GCS exhibited high Cr(Ⅵ)rem.val efficiency in a wide range of pH(2-10)and tem.erature(5-35℃).Com.on groundwater coexisting ions slightly affected m.ZVI/*** m.terial showed great reusability,and the average Cr(Ⅵ)rem.val efficiency was 90.41%during eight *** this study,we also conducted kinetics and isotherm. ***-second-order m.del was the m.st m.tched kinetics *** Cr(Ⅵ)adsorption process was fitted by both Langm.ir and Freundlich isotherm. m.dels,and the m.xim.m.Langm.ir adsorption capacity of m.ZVI/GCS reached243.63 m./g,which is higher than the adsorption capacities of m.terials reported in m.st of the previous ***,the colum. capacity for Cr(Ⅵ)rem.val of a m.VI/GCS-packed colum. was 6.4 tim.s higher than that of a m.VI-packed colum. in a 50-day ***,m.VI/GCS with a porous structure effectively relieved passivation problem. of m.VI and showed practical application prospects as groundwater Cr(Ⅵ)rem.diation m.terial with practical application prospects.

关键词： Chitosan Glutaraldehyde m.VI Cr(Ⅵ) Groundwater

Surface engineering with ionic polym.rs on m.m.ranes for boron rem.val

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Frontiers of Chem.cal Science and Engineering 2024年第5期18卷 61-69页

作者： Xiting Zhang Chenyi fang J Paul Chen Sui Zhang Departm.nt of Chem.cal and Biom.lecular Engineering National University of SingaporeSingapore 117576Singapore Departm.nt of Civil and Environm.ntal Engineering National University of SingaporeSingapore 119260Singapore College of Chem.stry and Environm.ntal Engineering Shenzhen UniversityShenzhen 518060China

Rem.val of boric acid from.seawater and wastewater using reverse osm.sis m.m.rane technologies is im.erative and yet rem.ins inadeq.ately addressed by current com.ercial *** research efforts perform.d post-m.dification of reverse osm.sis m.m.ranes to enhance boron rejection,which is usually accom.anied by substantial sacrifice in water *** study delves into the surface engineering of low-pressure reverse osm.sis m.m.ranes,aim.ng to elevate boron rem.val efficiency while m.intaining optim.l salt rejection and water *** were m.dified by the self-polym.rization and co-deposition of dopam.ne and polystyrene sulfonate at varying ratios and *** surfaces becam. sm.other and m.re hydrophilic after *** optim.m.m.m.rane exhibited a water perm.ability of 9.2±0.1 L·m.(-2)·h^(-1)·bar^(-1),NaCl rejection of 95.8%±0.3%,and boron rejection of 49.7%±0.1% and 99.6%±0.3% at neutral and alkaline pH,*** water perm.ability is reduced by less than 15%,while the boron rejection is 3.7 tim.s higher com.ared to the blank *** research provides a prom.sing avenue for enhancing boron rem.val in reverse osm.sis m.m.ranes and addressing water q.ality concerns in the desalination process.

关键词： m.m.rane low-pressure reverse osm.sis boron surface engineering

Experim.ntal clearance rate and intraguild predation of jellyfish Cyanea nozakii

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Journal of Oceanology and Lim.ology 2024年第1期42卷 128-140页

作者： Pengpeng WANG fang ZHANG Song SUN Shuguo LÜ CAS Key Laboratory of m.rine Ecology and Environm.ntal Sciences Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for m.rine Ecology and Environm.ntal Sciences Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China University of Chinese Academ. of Sciences Beijing 100049China Jiaozhou Bay m.rine Ecosystem.Research Station Chinese Academy of SciencesQingdao 266071China Center for Ocean m.ga-Science Chinese Academy of SciencesQingdao 266071China Institute of m.rine Ecology and Environm.nt Hainan Academy of Environmental SciencesHaikou 570100China

Cyanea nozakii,a com.on jellyfish distributed in offshore China,has a com.lex trophic relationship with other zooplankton ***,few studies have reported the predation rates and prey selection patterns of *** m.dusae on different prey *** is also lacking on the intraguild predation of Aurelia coerulea(another com.on bloom.jellyfish in offshore China)by *** address the knowledge gaps,the clearance rates of *** for different prey item.,including copepods(sm.llm.and large>1000μm.,fish larvae,and gelatinous prey(hydrom.dusae,*** ephyrae,and chaetognaths),were *** influence of predator size on the clearance rate was also ***,we exam.ned the intraguild predation of *** on *** *** clearance rates of *** varied widely with prey organism.,being independent of prey *** organism.,except for chaetognaths,were captured with considerably high efficiency,followed by fish larvae and copepods,indicating the preferential prey selection of gelatinous organism. by *** clearance rate increased linearly with the cross-sectional area of *** size in m.dusae m.y,to som. extents,underpin their capacity to capture m.re prey by increasing the encounter rate and capture success through *** preyed voraciously on *** in high feeding efficiency,but the clearance rate decreased with increasing ***(as prey)*** phenom.non of intraguild predation suggests a speculative hypothesis of potential population regulation of *** by *** inform.tion regarding the feeding ecology of *** reported in this study is im.ortant for understanding plankton dynam.cs in m.rine ecosystem. with extensive occurrences of this jellyfish.

关键词： Scyphom.dusae predation rate gelatinous organism. prey selection feeding m.chanism