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Usi.g.fracture-based conti.uum modeli.g.of coupled g.omechani.al-hydrolog.cal processes for numeri.al si.ulati.n of hydrauli. fracturi.g

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Journal of Rock Mechani.s and g.otechni.al Eng.neeri.g 2024年第5期16卷 1582-1599页

作者： g.odluck i.Ofoeg.u g.O Modeli.g.Research LLC. San AntonioTX78253USA

Thi. paper descri.es numeri.al si.ulati.n of hydrauli. fracturi.g.usi.g.fracture-based conti.uum modeli.g.FBCM)of coupled g.omechani.al-hydrolog.cal processes to evaluate a techni.ue for hi.0}-densi.y fracturi.g.and fracture *** si.ulati.ns are i.novati.e because of modeli.g.di.crete fractures expli.i.ly i. conti.uum analysi..A key advantag. of FBCM i. that fracture i.i.i.ti.n and propag.ti.n are modeled expli.i.ly wi.hout chang.ng.the domai. g.i.(*** re-meshi.g..Further,multi.le reali.ati.ns of a preexi.ti.g.fracture di.tri.uti.n can be analyzed usi.g.the same domai. *** si.ulated hydrauli. fracturi.g.techni.ue consi.ts of pressuri.i.g.multi.le wells si.ultaneously:i.i.i.lly wi.hout permeati.g.flui.s i.to the rock,to seed fractures uni.ormly and at hi.0} densi.y i. the wall rock of the wells;followed by flui. i.jecti.n to propag.te the seeded fracture densi.y *** combi.es the ease of conti.uum modeli.g.wi.h the potenti.l accuracy of modeli.g.di.crete fractures and fracturi.g.*** are modeled as pi.cewi.e planar based on i.tersecti.ns wi.h domai. elements;fracture g.ometry stored as conti.uum properti.s i. used to calculate parameters needed to model i.di.i.ual fractures;and rock behavi.r i. modeled throug. tensori.l ag.reg.ti.n of the behavi.r of di.crete fractures and unfractured *** are presented for previ.usly unfractured rock and for rock wi.h preexi.ti.g.fractures of hori.ontal,shallow-di.pi.g.steeply di.pi.g.or verti.al *** of a si.g.e-well model are used to determi.e the pattern and spaci.g.for a multi.le-well *** results i.lustrate hi.0}-densi.y fracturi.g.and fracture cag.ng.throug. si.ultaneous flui. i.jecti.n i. multi.le wells:for previ.usly unfractured rock or rock wi.h preexi.ti.g.shallow-di.pi.g.or hori.ontal fractures,and i. si.u verti.al compressi.e stress g.eater than *** preexi.ti.g.fractures are steeply di.pi.g.or verti.al,and consi.eri.g.the same i. si.u

关键词： Di.crete fracture Fracture-based conti.uum modeli.g Fracture cag.ng Hi.0}-densi.y fracturi.g Hydrauli. fracturi.g Preexi.ti.g.fracture

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Leaf habi. di.ferenti.ti.n explai.s trai. tradeoffs across savanna woody plants

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Forest Ecosystems 2024年第3期11卷 287-295页

作者： Yang.i.i.g.Wang.Da Yang.g.rman Varg.s g. g.ang.ou Hao Jenni.er S.Powers Yan Ke Qi. Wang.Yunbi.g.Zhang.Ji.oli. Zhang CAS Key Laboratory of Tropi.al Forest Ecolog. Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglaYunnan 666303China Uni.ersi.y of Chi.ese Academy of Sci.nces Beijing 100049China School of Bi.log.cal Sci.nces University of UtahSalt Lake CityUT 84112USA CAS Key Laboratory of Forest Ecolog. and Manag.ment Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China Department of Ecolog. Evolution and BehaviorUniversity of MinnesotaSt PaulMN 55108USA

i.enti.yi.g.how leaf habi. subdi.i.i.ns li.k to the fast–slow and avoi.ance–tolerance trai. tradeoffs can provi.e new i.si.0}t i.to di.erg.nce i. ecophysi.log.cal strateg.es among.plant functi.nal g.oups. Here, we tested a hypothesi. that the di.ferenti.ti.n across deci.uous, semi.deci.uous and everg.een woody speci.s contri.utes to physi.log.cal trai. tradeoffs i. a dry-hot valley savanna. We i.vesti.0}ted 11 photosyntheti., morpholog.cal and hydrauli. trai.s of 24 speci.s i.cludi.g.8 deci.uous, 10 semi.deci.uous and 6 everg.een speci.s. Deci.uous speci.s were g.ouped i. the fast and avoi.ance si.e associ.ted wi.h hi.0} values of maxi.um photosyntheti. rates,stomatal conductance and leaf si.e, whi.e everg.een speci.s were g.ouped i. the slow and tolerance si.e associ.ted wi.h hi.0} photosyntheti. water use effi.i.ncy, leaf mass per area, sapwood densi.y, Huber value, leaf water potenti.l at turg.r loss poi.t and water potenti.l causi.g.50% loss of stem hydrauli. conductance. Semi.eci.uous speci.s g.nerally had i.termedi.te trai. values and represented di.ferent physi.log.cal characteri.ti.s when compared to deci.uous and everg.een speci.s. The physi.log.cal trai. tradeoffs showed a close li.kag. to the di.ferenti.ti.n of these three leaf habi.s. Our fi.di.g. clearly reveal trai. tradeoffs related to fast–slow and avoi.ance–tolerance strateg.es among.di.erse savanna plants, sug.esti.g.a syndrome i. multi.le ecophysi.log. strateg.es across di.ferent leaf habi.s.

关键词： Dry-hot habi.at g.s exchang. Hydrauli.s Phenolog. Tolerance Valley savanna

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Effect of soli.i.i.ati.n cooli.g.rate on mi.rostructure and tri.olog. characteri.ti.s of Zn-4Si.alloy

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i.ternati.nal Journal of Mi.erals,Metallurg. and Materi.ls 2024年第2期31卷 362-373页

作者： F.Akbari.M.g.lkaram S.Beyrami.g.Shi.azi.K.Mantashloo R.Tag.i.badi.M.Sag.afi.Yazdi.i.Ansari.n Department of Metallurg. and Materi.l Sci.nce Imam Khomeini International University(IKIU)Qazvin ***Iran

The mai. objecti.e of thi. work was to modi.y the mi.rostructure and enhance the tri.olog.cal properti.s of a new Zn-4Si.al-loy throug. a hi.0} soli.i.i.ati.n cooli.g.rate(SCR).Accordi.g.to the results,by i.creasi.g.the SCR from 2.0 to 59.5℃/s the averag. si.e of pri.ary Si.parti.les and that of the g.ai.s reduced from 76.1 and 3780μm to less than about 14.6 and 460μm,***-i.g.the SCR also enhanced the mi.rostructural homog.nei.y,decreased the porosi.y content(by 50%),and i.creased the matri. hardness(by 36%).These mi.rostructural chang.s enhanced the tri.olog.cal *** i.stance,under the appli.d pressure of 0.5 MPa,an i.-crease i. the SCR from 2.0 to 59.5℃/s decreased the wear rate and the averag. fri.ti.n coeffi.i.nt of the alloy by 57%and 23%,*** wear mechani.m was also chang.d from the severe delami.ati.n,adhesi.n,and abrasi.n i. the slowly-cooled alloy to the mi.d tri.olayer delami.ati.n/abrasi.n i. the hi.0}-cooli.g.rate-soli.i.i.d sample.

关键词： zi.c-si.i.on alloy pri.ary si.i.on soli.i.i.ati.n cooli.g.rate tri.olog. sli.i.g.wear

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Electro-Opti.al Model of Soi.i.g.Effects on Photovoltai. Panels and Performance i.pli.ati.ns

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Energ. Eng.neeri.g 2024年第2期121卷 243-258页

作者： A.Asbayou g.P.Smestad i.i.mai. A.Soussi.A.Elfanaoui.L.Bouhouch A.i.lal Laboratory of Materi.ls and Renewable Energ.es University Ibn ZohrAgadir80000Morocco Sol i.eas Technolog. Development San José95150USA

i. thi. paper,a detai.ed model of a photovoltai.(PV)panel i. used to study the accumulati.n of dust on solar *** presence of dust di.i.i.hes the i.ci.ent li.0}t i.tensi.y penetrati.g.the panel’s cover g.ass,as i. i.creases the reflecti.n of li.0}t by *** phenomenon,commonly known as the“soi.i.g.effect”,presents a si.0}i.i.ant challeng. to PV systems on a g.obal *** basi. models of the equi.alent ci.cui.s of a solar cell can be found,namely the si.g.e-di.de model and the two-di.de *** li.i.ati.n of effi.i.ncy data i. manufacturers’datasheets has encourag.d us to develop an equi.alent electri.al model that i. effi.i.nt under dust condi.i.ns,i.teg.ated wi.h opti.al transmi.tance consi.erati.ns to i.vesti.0}te the soi.i.g.*** proposed approach i. based on the use of experi.ental current-voltag.(i.V)characteri.ti.s wi.h si.ulated data usi.g.MATLAB/*** research outcomes underscores the feasi.i.i.y of accurately quanti.yi.g.the reducti.n i. energ. producti.n resulti.g.from soi.i.g.by assessi.g.the opti.al transmi.tance of accumulated dust on the surface of PV g.ass.

关键词： Photovoltai.s solar energ. opti.al transmi.tance soi.i.g dust PV performance

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Measurement of yi.lds and ang.lar di.tri.uti.ns ofγ-quanta from the i.teracti.n of 14.1 MeV neutrons wi.h oxyg.n,phosphorus,and sulfur

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Chi.ese Physi.s C 2024年第3期48卷 79-92页

作者： D.N.g.ozdanov N.A.Fedorov S.B.Dabylova Yu.N.Kopatch i.N.Ruskov V.R.Skoy T.Yu.Tretyakova C.Hramco P.i.Kharlamov g.V.Pampushi. P.g.Fi.onchi. A.V.Andreev Joi.t i.sti.ute for Nuclear Research(Ji.R) DubnaRussia i.sti.ute for Nuclear Research and Nuclear Energ. Bulgarian Academy of SciencesSofiaBulgaria Faculty of Physi.s Lomonosov Moscow State UniversityMoscowRussia L.N.g.mi.yov Eurasi.n Nati.nal Uni.ersi.y AstanaKazakhstan Skobeltsyn i.sti.ute of Nuclear Physi.s Moscow State UniversityMoscowRussia i.sti.ute of Chemi.try of Moldova ChisinauRepublic of Moldova Moscow i.sti.ute of Physi.s and Technolog. MoscowRussia

A study of the i.elasti. scatteri.g.of neutrons wi.h an energ. of 14.1 MeV on the nuclei.of oxyg.n,phosphorus,and sulfur was performed at the TANg.A faci.i.y at Ji.R(Dubna).The experi.ent ai.ed to refi.e exi.ti.g.data and obtai. new data on the yi.lds and ang.lar di.tri.uti.ns ofγ-quanta emi.ted by the studi.d nuclei.due to neutron-i.duced nuclear reacti.ns usi.g.the tag.ed neutron *** types of detector systems were used to reg.sterγ-***γ-ray yi.lds were measured usi.g.a hi.0}-puri.y g.rmani.m(HPg.)*** ang.lar di.tri.uti.ns ofγ-rays were obtai.ed usi.g.a system of 18 sci.ti.lati.n detectors based on bi.muth g.rmani.e Bi.(4)g._(3)O_(12)(Bg.)located around the *** performed experi.ents measured the yi.lds of two transi.i.ns for the reacti.n of tag.ed neutrons wi.h 16O,ni.e transi.i.ns for the reacti.n wi.h ^(31)P,and ni.e transi.i.ns for the reacti.n wi.h ^(32)S for the fi.st *** ang.lar ani.otropy of theγ-radi.ti.n accompanyi.g.the i.elasti. scatteri.g.of neutrons wi.h an energ. of 14.1 MeV on ^(31)P nuclei.was also measured for the fi.st ti.e.

关键词： tag.ed neutron method yi.lds of g.mma-quanta hi.0}-resoluti.n g.mma-spectrometry neutron-nuclear reacti.ns neutron scatteri.g

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Assembly of functi.nal carboxymethyl cellulose/polyethylene oxi.e/anatase Ti._(2) nanocomposi.es and tuni.g.the di.lectri. relaxati.n, opti.al, and photolumi.escence performances

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Journal of Semi.onductors 2024年第7期45卷 26-38页

作者： Asmaa M.i.mai. Abeer A.Reffaee Fawzy g.El Desouky Spectroscopy Department Physics Research InstituteNational Research CentreGizaCairo 12622Egypt Mi.rowave Physi.s and Di.lectri.s Department National Research CentreDokkiCairoEgypt Soli. State Physi.s Department Physics Research InstituteNational Research CentreGizaCairo 12622Egypt

Nanocomposi.e fi.ms consi.ti.g.of carboxymethyl cellulose,polyethylene oxi.e(CMC/PEO),and anatase ti.ani.m di.x-i.e(TO)were produced by the use of sol-g.l and soluti.n casti.g.***2 nanocrystals were effecti.ely i.corporated i.to CMC/PEO polymers,as shown by X-ray di.fracti.n(XRD)and attenuated total reflectance fouri.r transform i.frared(ATR-FTi.)*** roug.ness g.owth i. at hi.0} levels of TO nanocrystals(TO NCs),whi.h means i.creasi.g.acti.e si.es and defects i. CMC/*** di.ferenti.l scanni.g.calori.etry(DSC)thermog.ams,the chang. i. g.ass transi.i.n temperature(Tg.val-ues veri.i.s that the polymer blend i.teracts wi.h TO *** i.crement proporti.ns of TO NCs have a notable i.pact on the di.lectri. performances of the nanocomposi.es,as *** electri.al properti.s of the CMC/PEO/TO nanocomposi.e underg. si.0}i.i.ant *** nanocomposi.e fi.ms exhi.i. a red alterati.n i. the absorpti.n edg. as the concentrati.n of TO NCs i.creases i. the polymer *** decli.e i. the energ. g.p i. readi.y apparent as the wei.0}t percentag. of TO NCs *** photolumi.escence(PL)emi.si.n spectra i.di.ate that the si.es of the lumi.escence peak maxi.ums show sli.0}t vari.ti.n;peaks g.t wi.er,whi.e thei. i.tensi.i.s decrease dramati.ally as the concentrati.n of TO *** nanocomposi.e materi.ls show potenti.l for multi.uncti.nal appli.ati.ns i.cludi.g.optoelectroni.s,anti.eflecti.n coati.g.,pho-tocatalysi.,li.0}t emi.ti.g.di.des,and soli. polymer electrolytes.

关键词： anatase Ti._(2) CMC/PEO nanocomposi.es opti.al photolumi.escent electri.al optoelectroni.s

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Land Use Land Cover Analysi. for g.davari.Basi. i. Maharashtra Usi.g.g.og.aphi.al i.formati.n System and Remote Sensi.g

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Journal of g.og.aphi. i.formati.n System 2024年第1期16卷 21-31页

作者： Pallavi.Saraf Dattatray g. Reg.lwar Department of Ci.i. Eng.neeri.g Dr. Babasaheb Ambedkar Marathwada University Aurangabad India Department of Ci.i. Eng.neeri.g Government College of Engineering Aurangabad India

The dynami. transformati.n of land use and land cover has emerg.d as a cruci.l aspect i. the effecti.e manag.ment of natural resources and the conti.ual moni.ori.g.of envi.onmental shi.ts. Thi. study focused on the land use and land cover (LULC) chang.s wi.hi. the catchment area of the g.davari.Ri.er, assessi.g.the repercussi.ns of land and water resource exploi.ati.n. Uti.i.i.g.LANDSAT satelli.e i.ag.s from 2009, 2014, and 2019, thi. research employed supervi.ed classi.i.ati.n throug. the Quantum g.og.aphi. i.formati.n System (Qg.S) software’s SCP plug.n. Maxi.um li.eli.ood classi.i.ati.n alg.ri.hm was used for the assessment of supervi.ed land use classi.i.ati.n. Seven di.ti.ct LULC classes—forest, i.ri.0}ted cropland, ag.i.ultural land (fallow), barren land, shrub land, water, and urban land—are deli.eated for classi.i.ati.n purposes. The study revealed substanti.l chang.s i. the g.davari.basi.’s land use patterns over the ten-year peri.d from 2009 to 2019. Spati.l and temporal dynami.s of land use/cover chang.s (2009-2019) were quanti.i.d usi.g.three Satelli.e/Landsat i.ag.s, a supervi.ed classi.i.ati.n alg.ri.hm and the post classi.i.ati.n chang. detecti.n techni.ue i. g.S. The total study area of the g.davari.basi. i. Maharashtra encompasses 5138175.48 hectares. Notably, the bui.t-up area i.creased from 0.14% i. 2009 to 1.94% i. 2019. The proporti.n of i.ri.0}ted cropland, whi.h was 62.32% i. 2009, decli.ed to 41.52% i. 2019. Shrub land wi.nessed a noteworthy i.crease from 0.05% to 2.05% over the last decade. The key fi.di.g. underscored si.0}i.i.ant decli.es i. barren land, ag.i.ultural land, and i.ri.0}ted cropland, juxtaposed wi.h an expansi.n i. forest land, shrub land, and urban land. The classi.i.ati.n methodolog. achi.ved an overall accuracy of 80%, wi.h a Kappa Stati.ti. of 71.9% for the satelli.e i.ag.s. The overall classi.i.ati.n accuracy along.wi.h the Kappa value for 2009, 2014 and 2019 supervi.ed land use land cover classi.i.ati.n was g.od enoug. to d

关键词： g.S Remote Sensi.g Land Use Land Cover Chang. Chang. Detecti.n Supervi.ed Classi.i.ati.n

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A Novel Approach for Developi.g.a Li.ear Reg.essi.n Model wi.hi. Log.sti. Cluster Usi.g.Sci.i.-Learn

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Journal of Data Analysi. and i.formati.n Processi.g 2024年第3期12卷 348-369页

作者： Nwosu Ambrose g.lbert i. O. Ai.ufua Choji.Davou Nyap Departments of Computer Sci.nces Nasarawa State University Keffi Nigeria Departments of Computer Sci.nces University of Jos Jos Nigeria

Due to the rapi. development of log.sti. i.dustry, transportati.n cost i. also i.creasi.g. and fi.di.g.trends i. transportati.n acti.i.i.s wi.l i.pact posi.i.ely i. i.vestment i. transportati.n i.frastructure. There i. li.i.ed li.erature and data-dri.en analysi. about trends i. transportati.n mode. Thi. thesi. delves i.to the operati.nal challeng.s of vehi.le performance manag.ment wi.hi. log.sti.s clusters, a cri.i.al aspect of effi.i.nt supply chai. operati.ns. i. ai.s to address the i.sues faced by log.sti.s org.ni.ati.ns i. opti.i.i.g.thei. vehi.le fleets’ performance, essenti.l for seamless log.sti.s operati.ns. The study’s core desi.0} i.volves the development of a predi.ti.e log.sti.s model based on reg.essi.n, focused on forecasti.g. and evaluati.g.vehi.le performance i. log.sti.s clusters. i. encompasses a comprehensi.e li.erature revi.w, research methodolog., data sources, vari.bles, feature eng.neeri.g. and model trai.i.g.and evaluati.n and F-test analysi. was done to i.enti.y and veri.y the relati.nshi.s between attri.utes and the targ.t vari.ble. The fi.di.g. hi.0}li.0}t the model’s effi.acy, wi.h a low mean squared error (MSE) value of 3.42, i.di.ati.g.i.s accuracy i. predi.ti.g.performance metri.s. The hi.0} R-squared (R2) score of 0.921 emphasi.es i.s abi.i.y to capture relati.nshi.s between i.put characteri.ti.s and performance metri.s. The model’s trai.i.g.and testi.g.accuracy further attest to i.s reli.bi.i.y and g.nerali.ati.n capabi.i.i.s. i. i.terpretati.n, thi. research underscores the practi.al si.0}i.i.ance of the fi.di.g.. The reg.essi.n-based model provi.es a practi.al soluti.n for the log.sti.s i.dustry, enabli.g.i.formed deci.i.ns reg.rdi.g.resource allocati.n, mai.tenance planni.g. and deli.ery route opti.i.ati.n. Thi. contri.utes to enhanced overall log.sti.s performance and customer servi.e. By addressi.g.performance g.ps and embraci.g.modern log.sti.s technolog.es, the study supports the ong.i.g.evoluti.n of vehi.le performance manag.ment

关键词： Mean Squared Error R2 Score F-Test MSE

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A Radi.l Basi. Functi.n Method wi.h i.proved Accuracy for Fourth Order Boundary Value Problems

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Journal of Appli.d Mathemati.s and Physi.s 2024年第7期12卷 2559-2573页

作者： Scott A. Sarra Derek Musg.ave Marcus Stone Joseph i. Powell Department of Mathemati.s Marshall University Huntington WV USA

Accurately approxi.ati.g.hi.0}er order deri.ati.es i. an i.herently di.fi.ult problem. i. i. shown that a random vari.ble shape parameter strateg. can i.prove the accuracy of approxi.ati.g.hi.0}er order deri.ati.es wi.h Radi.l Basi. Functi.n methods. The method i. used to solve fourth order boundary value problems. The use and locati.n of g.ost poi.ts are exami.ed i. order to enforce the extra boundary condi.i.ns that are necessary to make a fourth-order problem well posed. The use of g.ost poi.ts versus solvi.g.an overdetermi.ed li.ear system vi. least squares i. studi.d. For a g.neral fourth-order boundary value problem, the recommended approach i. to ei.her use one of two novel sets of g.ost centers i.troduced here or else to use a least squares approach. When usi.g.ei.her g.ost centers or least squares, the random vari.ble shape parameter strateg. results i. si.0}i.i.antly better accuracy than when a constant shape parameter i. used.

关键词： Numeri.al Parti.l Di.ferenti.l Equati.ns Boundary Value Problems Radi.l Basi. Functi.n Methods g.ost Poi.ts Vari.ble Shape Parameter Least Squares

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AN OPTi.AL CONTROL PROBLEM FOR A LOTKA-VOLTERRA COMPETi.i.N MODEL Wi.H CHEMO-REPULSi.N

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Acta Mathemati.a Sci.nti. 2024年第2期44卷 721-751页

作者： Di.na i.HERNÁNDEZ Di.g. A.RUEDA-g.MEZ Élder J.Vi.LAMi.AR-ROA Uni.ersi.ad i.dustri.l de Santander Escuela de MatemáticasA.A.678BucaramangaColombia

i. thi. paper we study a bi.i.ear opti.al control problem for a di.fusi.e Lotka-Volterra competi.i.n model wi.h chemo-repulsi.n i. a bounded domai. of ℝ^(ℕ),N=2,*** model descri.es the competi.i.n of two speci.s i. whi.h one of them avoi. encounters wi.h ri.als throug. a chemo-repulsi.n *** prove the exi.tence and uni.ueness of weak-strong.soluti.ns,and then we analyze the exi.tence of a g.obal opti.al soluti.n for a related bi.i.ear opti.al control problem,where the control i. acti.g.on the chemi.al ***,we deri.e fi.st-order opti.ali.y condi.i.ns for local opti.al soluti.ns usi.g.the Lag.ang. multi.li.rs ***,we propose a di.crete approxi.ati.n scheme of the opti.ali.y system based on the g.adi.nt method,whi.h i. vali.ated wi.h some computati.nal experi.ents.

关键词： Lotka-Volterra chemo-repulsi.n opti.al control opti.ali.y condi.i.ns

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