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Response of plasma turbulence agai.st externally-controlled perturbati.ns

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Chi.ese Physi.s B 2012年第9期21卷 385-395页

作者： S. i. i.oh k. i.oh Research i.sti.ute for Appli.d Mechani.s Kyushu University i.oh Research Center for Plasma Turbulence Kyushu University Nati.nal i.sti.ute for Fusi.n Sci.nce

A theory of the dynami. response of the turbulent plasma agai.st the externally-controlled perturbati.ns i. reported. Based on Mori.s method [Prog. Theor. Phys. 33 423 （1965）], the nonli.ear force i. assmned to be separated i.to the memory functi.n and the nonli.ear fluctuati.g force. The former corresponds to the dampi.g term, and the latter i. categori.ed i.to the noi.e term. The response of the turbulent plasma agai.st the externally-controlled source i. formulated. The response k.rnel, whi.h connects the externally-controlled source and the response of the turbulent fi.ld, i. shown to have both the nonlocal property （i. space） and the non-Mark.vi.n response （i. ti.e）. A di.cussi.n i. made on the nonlocal and non-Mark.vi.n response, i.cludi.g the case of di.parate-scale i.teracti.ns. A new method i. proposed to observe experi.entally the nonlocal i.teracti.n i. the dri.t wave turbulence vi. the zonal flows.

关键词： turbulent transport nonlocal and non-Mark.vi.n response

Development of damage probabi.i.y matri.es based on Greek.earthquak. damage data

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Earthquak. Engi.eeri.g and Engi.eeri.g Vi.rati.n 2011年第1期10卷 129-141页

作者： Anastasi. k. Eleftheri.dou Athanasi.s i. k.rabi.i. Laboratory of Rei.forced Concrete Department of Civil EngineeringDemocritus University of ThraceGreece

A comprehensi.e study i. presented for empi.i.al sei.mi. vulnerabi.i.y assessment of typi.al structural types, representati.e of the bui.di.g stock.of Southern Europe, based on a large set of damage stati.ti.s. The observati.nal database was obtai.ed from post-earthquak. surveys carri.d out i. the area struck.by the September 7, 1999 Athens earthquak.. After analysi. of the collected observati.nal data, a uni.i.d damage database has been created whi.h compri.es 180,945 damaged bui.di.gs from/after the near-fi.ld area of the earthquak.. The damaged bui.di.gs are classi.i.d i. speci.i. structural types, accordi.g to the materi.ls, sei.mi. codes and constructi.n techni.ues i. Southern Europe. The sei.mi. demand i. descri.ed i. terms of both the regi.nal macrosei.mi. i.tensi.y and the rati. αg/ao, where αg i. the maxi.um peak.ground accelerati.n （PGA） of the earthquak. event and ao i. the uni.ue value PGA that characteri.es each muni.i.ali.y shown on the Greek.hazard map. The relati.e and cumulati.e frequenci.s of the di.ferent damage states for each structural type and each i.tensi.y level are computed i. terms of damage rati.. Damage probabi.i.y matri.es （DPMs） and vulnerabi.i.y curves are obtai.ed for speci.i. structural types. A compari.on analysi. i. fulfi.led between the produced and the exi.ti.g vulnerabi.i.y models.

关键词： sei.mi. vulnerabi.i.y observati.nal earthquak. damage damage probabi.i.y matri.es (DPMs) vulnerabi.i.y curves post-earthquak. surveys Athens earthquak. exi.ti.g bui.di.gs

Semanti. Rule Based i.age Vi.ual Feature Ontology Creati.n

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i.ternati.nal Journal of Automati.n and computi.g 2014年第5期11卷 489-499页

作者： R. i. Mi.u k. k. Thyagharajan Department of Computer Sci.nce & Engi.eeri.g Jerusalem College of Engineering RMD Engi.eeri.g College

Multi.edi. i. one of the i.portant communi.ati.n channels for mank.0}d. Due to the advancement i. technology and enormous growth of mank.0}d, a vast array of multi.edi. data i. avai.able today. Thi. has resulted i. the obvi.us need for some techni.ues for retri.vi.g these data. Thi. paper wi.l gi.e an overvi.w of ontology-based i.age retri.val system for asteroi.eae flower fami.y domai.. i. order to reduce the semanti. gap between the low-level vi.ual features of an i.age and the hi.h-level domai. k.owledge, we have i.corporated a concept of multi.modal i.age ontology. So, the created asteroi.eae flower domai. speci.i. ontology would have the k.owledge about the domai. and the vi.ual features. The vi.ual features used to defi.e the ontology are prevalent color,basi. i.tri.si. pattern and contour gradi.nt. i. prevalent color extracti.n, the most domi.ant color from the i.ages was i.enti.i.d and i.dexed. i. order to determi.e the texture pattern for a parti.ular flower, basi. i.tri.si. patterns were used. The contour gradi.nts provi.e the i.formati.n on the i.age edges wi.h respect to the i.age base. These feature values are embedded i. the ontology at appropri.te slots wi.h respect to the domai. k.owledge. Thi. paper also defi.es some of the query axi.ms whi.h are used to retri.ve appropri.te i.formati.n from the created ontology. Thi. ontology can be used for i.age retri.val system i. semanti. web.

关键词： i.formati.n and k.owledge computer vi.i.n i.telli.ent computi.g feature extracti.n ontology

Effects of heavy metals (Pb^(2+) and Cd^(2+)) on the ultrastructure, growth and pi.ment contents of the uni.ellular cyanobacteri.m Synechocysti. sp. PCC 6803

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Chi.ese Journal of Oceanology and Li.nology 2009年第2期27卷 383-388页

作者： k. k. i. U. Arunak.mara 张学成 College of Mari.e Li.e Sci.nces Ocean University of China Department of Crop Sci.nce Faculty of AgricultureUniversity of Ruhuna

The uni.ellular cyanobacteri.m Synechocysti. sp. PCC 6803, a model organi.m k.own for i.s uni.ue combi.ati.n of hi.hly desi.able molecular geneti., physi.logi.al and morphologi.al characteri.ti.s, was employed i. the present study. The speci.s was cultured i. BG11 li.ui. medi.m contai.ed vari.us i.i.i.l concentrati.ns of Pb^2＋ and Cd〉（0, 0.5, 1, 2, 4, 6 and 8 mg/L）. The experi.ent was conducted for si. days and the metal i.duced alterati.ns i. the ultrastructure, growth and pi.ment contents were assessed. Alterati.ns i. the ultrastructure of the Synechocysti. sp. PCC 6803 cells became evi.ent wi.h the i.creased （〉4 mg/L Pb^2＋） metal concentrati.n. The photosyntheti. apparatus （thylak.i. membranes） were found to be the worst affected. Deteri.rated or completely destroyed thylak.i. membranes have made large empty spaces i. the cell i.teri.r. i. addi.i.n, at the hi.hest concentrati.n （8 mg/L pb^2＋）, the polyphosphate granules became more promi.ent both i. si.e and number. Despi.e the i.i.i.l sli.ht sti.ulati.ns （0.2, 3.8 and 6.5% respecti.ely at 0.5, 1 and 2 mg/L pb^2＋）, both metals i.hi.i.ed the growth i. a dose-dependent manner as i.cubati.n progressed. Pi.ment contents （chlorophyll a, 13 carotene and phycocyani.） were also decreased wi.h i.creasi.g metal concentrati.n. Cells exposed to 6 mg/L Pb^2＋, resulted i. 36.56, 37.39 and 29.34% reducti.ns of chlorophyll a, 13 carotene and phycocyani. respecti.ely over the control. Correspondi.g reducti.ns for the same CdZ＋concentrati.ns were 57.83, 48.94 and 56.90%. Lethal concentrati.n （96 h LC50） values （3.47 mg/L Cd^2＋ and 12.11 mg/L Pb^2＋） i.di.ated that Synechocysti. sp. PCC 6803 i. more vulnerable to Cd^2＋ than Pb^2＋.

关键词： growth pi.ment contents Synechocysti. sp. PCC 6803 ultrastructure

Arcti. sea-i.e extent: No record mi.i.um i. 2023 or recent years

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Atmospheri. and Oceani. Sci.nce Letters 2025年第1期18卷 52-55页

作者： Ola M.Johannessen Tor i.Olaussen Nansen Sci.nti.i. Soci.ty BergenNorway Nansen Envi.onmental and Remote Sensi.g Center BergenNorway

Arcti. sea-i.e extent reaches i.s mi.i.um each year i. September. On 11 September 2023 the mi.i.um was 4.969 mi.li.n square k.0}ometers(***^(2)). Thi. was not a record low, whi.h occurred i. 2012, when the mi.i.um was 4.175 ***^(2), 0.794 ***^(2) less than the mi.i.um i. 2023. However, the i.e extent had decreased by 0.432 ***^(2) compared wi.h 2022. Nevertheless, the summer melti.g i. 2023 was remark.bly less than expected when consi.eri.g the strong heat waves i. the atmosphere and ocean, wi.h record temperatures set around the world. i. general, there i. a hi.h correlati.n between the long-term decrease i. sea-i.e extent and the i.creasi.g CO_(2) i. the atmosphere, where the i.crease of CO_(2) i. recent decades explai.s about 80% of the decrease i. sea i.e i. September, whi.e the remai.der i. caused by natural vari.bi.i.y.

关键词： Sea i.e Arcti. Mi.i.um i.e Cli.ate

Fati.ue i.duced Alterati.n of the Superfi.i.l Strength Properti.s of 2024 Alumi.um Alloy

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Journal of Materi.ls Sci.nce & Technology 2011年第9期27卷 776-784页

作者： k.-D. Bouzak.0} i. Mi.i.i.i. Sp.G. Pantelak.0} A.N. Chamos Laboratory for Machi.e Tools and Manufacturi.g Engi.eeri.g Mechanical Engineering Department Aristotle Uni-versity of Thessaloniki Laboratory of Technology and Strength of Materi.ls Department of Mechanical Engineering & Aeronautics Univer-sity of Patras

alumi.um alloy 2024 T3 speci.ens have been subjected to constant ampli.ude fati.ue loadi.g at R=0.1. Duri.g fati.ue, an appreci.ble i.crease of the surface hardness of the materi.l at the meso-scale can be observed and captured by means of nanoi.dentati.ns. Surface hardness i.creases wi.h i.creasi.g fati.ue stress ampli.ude and advanci.g number of appli.d fati.ue cycles. Observed i.crease of speci.en surface hardeni.g degree duri.g fati.ue causes an evoluti.n of superfi.i.l mechani.al strength properti.s of the alloy. Stress-strai. curves associ.ted wi.h the evoluti.g superfi.i.l mechani.al properti.s are deri.ed, employi.g a developed fi.i.e element method （FEM）-supported evaluati.n procedure of nanoi.dentati.n experi.ental results.

关键词： 2024 alumi.um alloy Nanoi.dentati.ns Fati.ue loadi.g Stress-strai. curves

Marble epi.tyles under shear: an experi.ental study of the role of “Reli.vi.g Space”

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Fronti.rs of Structural and Ci.i. Engi.eeri.g 2019年第4期13卷 767-786页

作者： E. D. PASi.U i. STAVRAk.S D. TRi.NTi. S. k. k.URk.ULi. Department of Mechani.s Laboratory of Testing and Materials National Technical University of Athens Athens 15773 Greece Department of Electroni.s Laboratory of Electrical Characterization of Materials and Electronic Devices Technological Edu-cational Institution of Athens Athens 12210 Greece

The mechani.al response of mutually i.terconnected epi.tyles i. studi.d experi.entally. The speci.ens are made of two marble block. connected to each other wi.h an “i.-shaped ti.ani.m connector placed i. grooves sculptured on the block. and covered wi.h cementi.i.us materi.l. The speci.i. way of connecti.g epi.tyles si.ulates the one used by sci.nti.ts restori.g the anci.nt “connecti.ns” of the epi.tyles of the Parthenon Temple. Thi. “connecti.n”, although desi.ned to sustai. mai.ly tensi.e loadi.g, undertak.s, also, shear load, i. case of exci.ati.ns i.posi.g to the epi.tyles di.placements normal to the connector’s axi.. Attenti.n i. focused to enli.hten the role of a novel desi.n techni.ue ai.i.g to reli.ve the stress fi.ld around the connector. Accordi.g to thi. techni.ue, part of the connector’s web i. left uncovered, formi.g the so-called “Reli.vi.g Space”, assi.ti.g the unconstrai.ed deformati.n of the connector. Both tradi.i.nal and i.novati.e sensi.g techni.ues were employed i. an effort to obtai. data from the i.teri.r of the three-materi.l-complex (marble-cementi.i.us materi.l-ti.ani.m). Analysi. of the data i.di.ated that the “Reli.vi.g Space” reduces the overall sti.fness of the system, protecti.g marble i. case of over-loadi.g. Moreover, i. was concluded that the i.novati.e techni.ues employed provi.e pre-fai.ure i.di.ators well i. advance of the catastrophi. fai.ure of the speci.ens.

关键词： monuments of cultural heri.age marble epi.tyles pressure sti.ulated currents acousti. emi.si.n di.i.al i.age correlati.n

Opti.i.ati.n of suspensi.n system of off-road vehi.le for vehi.le performance i.provement

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Journal of Central South Uni.ersi.y 2013年第4期20卷 902-910页

作者： M. Mahmoodi.k.lei.ar i. Javanshi. k. Asadi.A. Afk.r A. Payk.ni Department of Mechani.al Engi.eeri.g Parand Branch Islamic Azad University School of Mechani.al Engi.eeri.g Iran University of Science and Technology School of Automoti.e Engi.eeri.g Iran University of Science and Technology

Vehi.le suspensi.n desi.n i.cludes a number of compromi.es to provi.e good leveli.g of stabi.i.y and ri.e comfort. Opti.i.ati.n of off-road vehi.le suspensi.n system i. one of the most effecti.e methods, whi.h could consi.erably enhance the vehi.le stabi.i.y and controllabi.i.y. i. thi. work. a comprehensi.e opti.i.ati.n of an off-read vehi.le suspensi.n system model was carri.d out usi.g software ADAMS. The geometri. parameters of suspensi.n system were opti.i.ed usi.g geneti. algori.hm (GA) i. a way that ri.e comfort, handli.g and stabi.i.y of vehi.le were i.proved. The results of opti.i.ed suspensi.n system and vari.ti.ns of geometri. parameters due to road roughness and di.ferent steeri.g angles were presented i. ADAMS and the results of opti.i.ed and conventi.nal suspensi.n systems duri.g vari.us dri.i.g maneuvers were compared. The si.ulati.n results i.di.ate that the camber angle vari.ti.ns decrease by the opti.i.ed suspensi.n system, resulti.g i. i.proved handli.g and ri.e comfort characteri.ti.s.

关键词： opti.i.ed suspensi.n system stabi.i.y ri.e comfort vehi.le double wi.hbone suspensi.n system model

Effect of (Ba_(0.6)Sr_(0.4))Ti._3(BST) Dopi.g on Di.lectri. Properti.s of CaCu_3Ti.4O_(12)(CCTO)

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Journal of Materi.ls Sci.nce & Technology 2012年第12期28卷 1137-1144页

作者： i. Norezan A.k. Yahya M.k. Talari Faculty of Appli.d Sci.nces Universiti Teknologi MARAShah Alam Selangor Malaysia

The effect of （Ba（0.6）Sr（0.4））Ti.3（BST） addi.i.n on di.lectri. properti.s of CaCu3Ti.O（12）（CCTO） cerami. was i.vesti.ated. Cerami. samples wi.h the chemi.al formula （1-x）CaCu3Ti.O（12）＋ x（Ba（0.6）,Sr（0.4））Ti.3 （x=0, 0.05, 0.1, and 0.2） were synthesi.ed from hi.h puri.y oxi.e powders by the conventi.nal soli.-state synthesi. method. X-ray di.fracti.n （XRD） analysi. showed the exi.tence of BST as a secondary phase alongsi.e CCTO. Scanni.g electron mi.roscopy （SEM） i.vesti.ati.n showed a sli.ht decrease i. grai. si.e of doped CCTO samples. Densi.y measurements showed that porosi.y content i.creased wi.h i.creasi.g BST addi.i.n i.di.ati.g low densi.i.ati.n due to hi.h melti.g poi.t secondary phase addi.i.n. Di.lectri. constant of undoped CCTO （x=0） showed lack.of stabi.i.y wi.h frequency whi.h dropped drasti.ally between 104 and 105Hz and accompani.d by hi.h di.lectri. loss. Addi.i.n of BST i.to CCTO caused the di.lectri. constant to sli.htly decrease but i.proved stabi.i.y wi.h frequency compared to the undoped sample. The decrease i. di.lectri. constant of doped CCTO samples was suggested to be partly due to the decrease i. average grai. si.e and i.crease i. porosi.y wi.h BST addi.i.n. Nevertheless, a hi.h value of di.lectri. constant was sti.l mai.tai.ed around ～104 range for all doped samples. The di.lectri. loss （tanδ） of all BST-doped samples was lower than that of pure CCTO sample at the frequency range of 103 to 105 Hz probably due to the i.crease of grai.s boundary resi.ti.i.y. The acti.ati.n energy of grai.s boundary （E（gb）） showed hi.her values as compared to the acti.ati.n energy of grai.s （Eg ） for all samples and conforms to the i.ternal barri.r layer capaci.or （i.LC） model.

关键词： CaCu3Ti.O(12)(CCTO) Di.lectri. properti.s (Ba(0.6)Sr(0.4))Ti.3(BST)