检索结果-南通市图书馆

Unconfined compressive strength a.d fa.lure beha.iour of completely wea.hered gra.ite from a.fa.lt zone

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journa. of Mounta.n Science 2024年第6期21卷 2140-2158页

作者： DU Sha.hua.ma Jinyin ma Liya. ZHa. Ya.ia. School of Civil Engineering a.d a.chitecture Henan University of Science and TechnologyLuoyang 471023China School of Resources a.d Sa.ety Engineering Central South UniversityChangsha 410083China China.Ra.lwa. 18th Burea. Group Co. LtdTianjin 300222 China China.Genera. Nuclea. Power Corpora.ion Shenzhen 518031China

Understa.ding the strength cha.a.teristics a.d deformation beha.iour of the tunnel surrounding rock in a.fa.lt zone is significa.t for tunnel sta.ility *** this study,a.series of unconfined compression tests were conducted to investiga.e the mecha.ica. cha.a.teristics a.d fa.lure beha.iour of completely wea.hered gra.ite(CWG)from a.fa.lt zone,considering with height-dia.eter(h/d)ra.io,dry densities(ρd)a.d moisture contents(ω).Ba.ed on the experimenta. results,a.regression mathematica. model of unconfined compressive strength(UCS)for CWG wa. developed using the Multiple Nonlinea. Regression method(MNLR).The resea.ch results indica.ed tha. the UCS of the specimen with a.h/d ra.io of 0.6 decrea.ed with the increa.e ofω.When the h/d ra.io increa.ed to 1.0,the UCS increa.edωwith up to 10.5%a.d then ***ρd is conducive to the improvement of the UCS a. a.yω.The deformation a.d rupture process a. well a. fina. fa.lure modes of the specimen a.e controlled by h/d ra.io,ρd a.dω,a.d the h/d ra.io is the domina.t fa.tor a.fecting the fina. fa.lure mode,followed byωa.dρ*** specimens with different h/d ra.io exhibited completely different fra.ture mode,i.e.,typica. splitting fa.lure(h/d=0.6)a.d shea. fa.lure(h/d=1.0).By compa.ing the experimenta. results,this regression model for predicting UCS is a.cura.e a.d relia.le,a.d the h/d ra.io is the domina.t fa.tor a.fecting the UCS of CWG,followed byρd a.d thenω.These findings provide importa.t references for maintena.ce of the tunnel crossing other fa.lt fra.tured zones,especia.ly a. low confining pressure or unconfined condition.

关键词： Fa.lt fra.ture zone Completely wea.hered gra.ite(CWG) Unconfined compression strength(UCS) Multiple nonlinea. regression model

Mitiga.e noisy da.a.for smart ioT via.Ga. ba.ed machine unlea.ning

在线全文

学校读者我要写书评

暂无评论

Science China.information Sciences) 2024年第3期67卷 62-78页

作者： Zhuo ma Yilong Ya.G Ya.g LiU Xinjing LiU Jia.feng ma School of Cyber Engineering Xidian University Sta.e Key La.ora.ory of integra.ed Services Networks (iSN)

With the development of ioT a.plica.ions, machine lea.ning dra.0}tica.ly improves the utility of va.ia.le ioT systems such a. a.tonomous driving. a.though the pretra.n-finetune fra.ework ca. cope well with da.a.heterogeneity in complex ioT scena.ios, the da.a.collected by sensors often conta.n unexpected noisy da.a. e.g., out-of-distribution(OOD) da.a. which lea.s to the reduced performance of fine-tuned models. To resolve the problem, this pa.er proposes Mu Ga., a.method tha. ca. mitiga.e the side-effect of OOD da.a.via.the genera.ive a.versa.ia. network(Ga.)-ba.ed machine unlea.ning. Mu Ga. follows a.stra.ghtforwa.d but effective idea.to mitiga.e the performance loss ca.sed by OOD da.a. i.e., “fla.hba.king” the model to the condition where OOD da.a.a.e excluded from model tra.ning. To a.hieve the goa., we design a. a.versa.ia. ga.e, where a.discrimina.or is tra.ned to identify whether a.sa.ple belongs to the tra.ning set by observing the confidence score. Mea.while, a.genera.or(i.e., the ta.get model) is upda.ed to fool the discrimina.or into believing tha. the OOD da.a.a.e not included in the tra.ning set but others do. The experimenta. results show tha. benefiting from the high unlea.ning ra.e(more tha. 90%) a.d retention ra.e(99%), Mu Ga. succeeds in lowering the model performance degra.a.ion ca.sed by OOD da.a.from 5.88% to 0.8%.

关键词： machine unlea.ning genera.ive a.versa.ia. network out of distribution da.a internet of Thing neura. network

impa.ts of intera.tions with low-minera.ized wa.er on permea.ility a.d pore beha.ior of ca.bona.e reservoirs

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Energy Geoscience

Energy Geoscience 2024年第4期5卷 278-290页

作者： Dmitriy a.martyushev inna.N.Ponomareva.Va.iliy i.Chernykh Sha.fa. Da.oodi Yousef Ka.emza.eh Tia.shou ma Depa.tment of Oil a.d Ga. Technologies Perm National Research Polytechnic UniversityPermRussia School of Ea.th Sciences&Engineering Tomsk Polytechnic UniversityLenin AvenueTomskRussia Enha.ced Oil Recovery(EOR)Resea.ch Center IOR/EOR Research InstituteShiraz UniversityShirazIran Sta.e Key La.ora.ory of Oil a.d Ga. Reservoir Geology a.d Exploita.ion Southwest Petroleum UniversityChengduSichuanPR China

La.ora.ory filtra.ion experiments a.e employed to investiga.e effective well killing while minimizing its impa.ts on surrounding *** novelty of this experimenta. study lies in the prolonged exposure of rock sa.ples to the killing fluid for seven da.s,corresponding to the a.era.e dura.ion of well workovers in the oilfields in Perm Kra.,*** findings indica.e tha. critica. fa.tors influencing the intera.tions between rocks a.d the killing fluid include the chemica. composition of the killing fluid,the minera.ogica. composition of the ca.bona.e rocks,reservoir pressure a.d tempera.ure,a.d the conta.t *** a.a.yses using multi-sca.e X-ra. computed tomogra.hy,field emission sca.ning electron microscopy,a.d X-ra. diffra.tion were conducted on sa.ples both before a.d a.ter the well killing *** experiments were performed using rea. sa.ples of cores,crude oil,a.d the killing *** results from this study indica.e tha. low-minera.ized wa.er(pra.tica.ly fresh wa.er)is a.ca.bona.e rock *** wa.er ca.ses the dissolution of rock components,the formation of new ca.cite crysta.s a.d a.oeba.like secretions,a.d the migra.ion of small pa.ticles(cla.,qua.tz,a.d ca.bona.es).The formation of deep cha.nels wa. a.so *** a.sessment revea.s tha. the cha.ge in the pH of the killing fluid indica.es tha. the observed minera. rea.tions were ca.sed by ca.bona.e *** combined phenomena.led to a.decrea.e in the tota. number of voids in the core sa.ples,which wa. 25%on a.era.e,predomina.tly a.ong voids mea.uring between 45 a.d 70μm in *** cha.ge in the pore distribution in the bulk of the sa.ples resulted in decrea.es in porosity of 1.8%a.d permea.ility of 67.0%in the studied core *** results from this study indica.e the unsuita.ility of low-minera.ized wa.er a. a.well killing fluid in ca.bona.e *** composition of the killing fluid should be optimized,for exa.ple,in terms of the ionic composition of wa.er,

关键词： Fine pa.ticle Cla. minera. Low-minera.ized wa.er Geochemica. dissolution Ca.bona.e reservoir

Effects of gra.el on the wa.er a.sorption cha.a.teristics a.d hydra.lic pa.a.eters of stony soil

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journa. of a.id La.d 2024年第7期16卷 895-909页

作者： ma Ya. Wa.G Youqi ma Chengfeng YUa. Cheng Ba. Yiru Breeding Ba.e for Sta.e Key La.ora.ory of La.d Degra.a.ion a.d Ecologica. Restora.ion in Northwest China Ningxia UniversityYinchuan 750021China School of Geogra.hy a.d Pla.ning Ningxia UniversityYinchuan 750021China School of Ecology a.d Environment Ningxia UniversityYinchuan 750021China

The ea.tern foothills of the Hela. Mounta.ns in China.a.e a.typica. mounta.nous region of soil a.d gra.el,where gra.el could a.fect the wa.er movement process in the *** study focused on the effects of different gra.el contents on the wa.er a.sorption cha.a.teristics a.d hydra.lic pa.a.eters of stony *** stony soil sa.ples were collected from the ea.tern foothills of the Hela. Mounta.ns in a.ril 2023 a.d used a. the experimenta. materia.s to conduct a.one-dimensiona. horizonta. soil column a.sorption *** experimenta. groups with gra.el contents of 0%,10%,20%,30%,40%,a.d 50%were esta.lished to determine the sa.ura.ed hydra.lic conductivity(K_(s)),sa.ura.ed wa.er content(θ_(s)),initia. wa.er content(θ_(i)),a.d retention wa.er content(θ_(r)),a.d explore the cha.ges in the wetting front depth a.d cumula.ive a.sorption volume during the a.sorption *** Philip model wa. used to fit the soil a.sorption process a.d determine the soil wa.er a.sorption *** the length of the cha.a.teristic wetting front depth,sha.e coefficient,empirica. pa.a.eter,inverse inta.e suction a.d soil wa.er suction were derived from the va. Genuchten ***,the hydra.lic pa.a.eters mentioned a.ove were used to fit the soil wa.er cha.a.teristic curves,unsa.ura.ed hydra.lic conductivity(K_(θ))a.d specific wa.er ca.a.ity(C(h)).The results showed tha. the wetting front depth a.d cumula.ive a.sorption volume of ea.h trea.ment gra.ua.ly decrea.ed with increa.ing gra.el *** with control check trea.ment with gra.el content of 0%,soil wa.er a.sorption ra.es in the trea.ments with gra.el contents of 10%,20%,30%,40%,a.d 50%decrea.ed by 11.47%,17.97%,25.24%,29.83%,a.d 42.45%,*** the gra.el content increa.ed,inverse inta.e suction gra.ua.ly increa.ed,a.d sha.e coefficient,K_(s),θ_(s),a.dθ_(r)gra.ua.ly *** the sa.e soil wa.er content,soil wa.er suction a.d K_(θ)gra.ua.ly decrea.ed with increa.ing gra.el *** the sa.e soil wa.er s

关键词： stony soil gra.el content wa.er a.sorption cha.a.teristics hydra.lic pa.a.eters one-dimensiona. horizonta. soil column a.sorption experiment va. Genuchten model ea.tern foothills of Hela. Mounta.ns

L^(*)—a. index for eva.ua.ing long ra.ge performance of a.tonomous underwa.er vehicles(a.Vs)

在线全文

学校读者我要写书评

暂无评论

Friction 2024年第10期12卷 2205-2221页

作者： manfu ZHU Lira. ma Jia.bin LUO Sta.e Key La.ora.ory of Tribology in a.va.ced Equipment Tsinghua UniversityBeijing 100084China

a.tonomous underwa.er vehicles(a.Vs)ha.e va.ious a.plica.ions in both milita.y a.d civilia. fields.a.wider opera.ion a.ea.a.d more complex ta.ks require better overa.l ra.ge performance of ***,until recently,there ha.e been few unified criteria.for eva.ua.ing the ra.ge performance of *** the present work,a.unified ra.ge index,i.e.,L^(*),considering the cruising speed,the sa.ling dista.ce,a.d the volume of a. a.V,is proposed for the first time,which ca. overcome the shortcomings of previous criteria.using merely one single pa.a.eter,a.d provide a.uniform criterion for the overa.l ra.ge performance of va.ious *** constructing the expression of the L^(*)index,the releva.t da.a.of 49 a.Vs from 12 countries worldwide ha.e been collected,a.d the cha.a.teristics of the L^(*)ra.ge index in different countries a.d different ca.egories were compa.ed a.d ***,by a.a.yzing the complex fa.tors a.fecting the ra.ge index,methods to enha.ce the L^(*)ra.ge index va.ue,such a. efficiency enha.cement a.d dra. reduction,ha.e been introduced a.d *** this condition,the work proposes a.unified a.d scientific criterion for eva.ua.ing the ra.ge performance of a.Vs for the first time,provides va.ua.le theoretica. insight for the development of a.Vs with higher performance,a.d then a.ouses more a.tention to the a.plica.ion of the cutting-edge superlubricity technology to the field of underwa.er vehicles,which might grea.ly help to a.celera.e the coming of the era.of the superlubricitive engineering.

关键词： a.tonomous underwa.er vehicles(a.Vs) ra.ge performance ra.ge index superlubricity dra. reduction

Ela.tic wa.e insula.ion a.d propa.a.ion control ba.ed on the progra.mable curved-bea. periodic structure

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

a.plied mathematics a.d Mecha.ics(English Edition) 2024年第10期45卷 1791-1806页

作者： Jia.ia.maO Hong CHENG Tia.xue ma Beijing Key La.ora.ory of Nonlinea. Vibra.ions a.d Strength of Mecha.ica. Structures Department of MechanicsSchool of MathematicsStatistics and MechanicsBeijing University of TechnologyBeijing 100124China Depa.tment of Mecha.ics School of Physical Science and EngineeringBeijing Jiaotong UniversityBeijing 100044China

Curved-bea.s ca. be used to design modula. multista.le meta.0}teria.s(MMMs)with reprogra.mable materia. properties,i.e.,progra.mable curved-bea. periodic structure(PCBPS),which is promising for controlling the ela.tic wa.e *** PCBPS is theoretica.ly equiva.ent to a.spring-oscilla.or system to investiga.e the mecha.ism of ba.dga.,a.a.yze the wa.e propa.a.ion mecha.isms,a.d further form its geometrica. a.d physica. criteria.for tuning the ela.tic wa.e *** the equiva.ent model,we ca.cula.e the a.a.ytica. solutions of the dispersion rela.ions to demonstra.e its a.justa.ility,a.d investiga.e the wa.e propa.a.ion cha.a.teristics through the *** va.ida.e the equiva.ent system,the finite element method(FEM)is *** is revea.ed tha. the ba.dga.s of the PCBPS ca. be turned on-a.d-off a.d shifted by va.ying its physica. a.d geometrica. *** findings a.e highly promising for a.va.cing the pra.tica. a.plica.ion of periodic structures in wa.e insula.ion a.d propa.a.ion control.

关键词： curved-bea. ba.ed periodic structure equiva.ent stiffness spring-oscilla.or system dispersion rela.ion wa.e propa.a.ion

Provena.ce of Conglomera.e a.d Sa.dstone from Ea.ly Permia. Shousha.gou Formation in Xi Ujimqin,inner Mongolia.implica.ions for Understa.ding Pa.eo-a.ia. Ocea. Subduction

在线全文

学校读者我要写书评

暂无评论

a.ta.Geologica.Sinica.English Edition) 2024年第1期98卷 10-31页

作者： ZHa.G Yingli GUO Xia.qing ma Shouxia. MNR Key La.ora.ory of Meta.logeny a.d Minera. a.sessment Institute of Mineral ResourcesCAGSBeijing 100037China Chinese a.a.emy of Geologica. Sciences Beijing 100037China

During the La.e Ca.boniferous to Ea.ly Permia.,a.rift wa. formed by post-collisiona. extension a.ter ocea. closure or a. isla.d a.c-rela.ed ba.in formed by Pa.eo-a.ia. Ocea.(Pa.)subduction in the Xi Ujimqin ***,the closure time of the Pa. is still under ***,to identify the origin of the Pa.,the geochemistry a.d U-Pb a.e of zircons were a.a.yzed for the extra.la.ge deep marine,polymict cla.tic boulders a.d sa.dstones in the Shousha.gou Formation within the *** a.a.yses revea.ed magmatic a.tivity a.d tectonic *** conglomera.es include mega.la.ts of gra.ite(298.8±9.1 ma)a.d gra.odiorite porphyry(297.1±3.1 ma),which were deposited by muddy debris *** of this study demonstra.ed tha. the boulders of gra.itoids ha.e the geochemistry of typica. i-type gra.ite,cha.a.terized by low Zr+Nb+Ce+Y a.d low Ga.a. *** gra.itoid boulders were formed in isla.d a.c setting,indica.ing the presence of a.c magmatism in the a.ea.tha. is composed of the La.e Ca.boniferous to Ea.ly Permia. subduction-rela.ed gra.itoid in southern Xi *** dia.ra.s for determining sedimenta.y provena.ce using major a.d tra.e elements indica.e tha. Shousha.gou sediments origina.ed from continenta. isla.d a.c-rela.ed felsic *** zircon U-Pb a.e cluster of 330–280 ma wa. obta.ned,indica.ing input from gra.ite,ophiolite,Xilin Gol complex,a.d Ca.boniferous sources to the *** ba.in wa. geogra.hica.ly developed behind the a.c during the Ea.ly Permia. period beca.se the outcropped intrusive rocks in the La.e Ca.boniferous to Ea.ly Permia. form a.volca.ic *** comprehensive a.a.yses of source a.ea. suggest tha. Shousha.gou sediments developed in a.ba.ka.c ba.in in response to the northwa.d subduction of the *** ba.ka.c ba.in a.d intrusive rocks,in a.dition to previously published La.e Ca.boniferous to Ea.ly Permia. magmatic rocks of a.c unit in Xilin Gol,confirm the presence of a. Ea.ly Permia. trencha.c-ba.in system in the region,r

关键词： provena.ce a.a.ysis ba.ka.c ba.in Shousha.gou Formation Ea.ly Permia. Centra. a.ia. Orogenic Belt

Wea.a.le multilea. ECG sensing systems using on-skin stretcha.le a.d brea.ha.le dry a.hesives

在线全文

学校读者我要写书评

暂无评论

Bio-Design a.d manufa.turing 2024年第2期7卷 167-180页

作者： Yingxi Xie Longsheng Lu Wenta. Wa.g Hua. ma School of Mecha.ica. a.d a.tomotive Engineering South China University of TechnologyGuangzhou 510641China College of a.tomotive a.d Mecha.ica. Engineering Changsha University of Science and TechnologyChangsha 410114China Gua.gdong Ca.diova.cula. institute Guangdong Provincial People’s HospitalGuangzhou 510080China

Electroca.diogra.(ECG)monitoring is used to dia.nose ca.diova.cula. disea.es,for which wea.a.le electronics ha.e a.tra.ted much a.tention due to their lightweight,comfort,a.d long-term *** study developed a.wea.a.lemultilea. ECG sensing system with on-skin stretcha.le a.d conductive silver(a.)-coa.ed fiber/silicone(a.CF-S)dry *** a.d normal a.hesion to pigskin(0.43 a.d 0.20 N/cm2,respectively)wa. optimized by the a.tive control of fiber density a.d mixing ra.io,resulting in close conta.t in the electrode–skin *** brea.ha.lea.CF-S dry electrodewa. nona.lergenic a.ter continuous fit for 24 h a.d ca. be reused/clea.ed(>100 times)without loss of *** a.CF enca.sula.ed inside silicone ela.tomers wa. overla.ped to construct a.dyna.ic network under repea.ed stretching(10%stra.n)a.d bending(90°)deformations,ena.ling small intrinsic impeda.ce(0.3,0.1 Hz)a.d conta.t impeda.ce va.ia.ion(0.7 k)in high-frequency vibra.ion(70 Hz).a.l ha.d/soft modules of the multilea. ECG system were integra.ed into lightweight clothing a.d equipped with wireless tra.smission for signa. *** synchronous a.quisition of i–iii,a.R,a.L,a.F,a.d V4 lea. da.a.the multilea. ECG sensing system wa. suita.le for va.ious scena.ios,such a. exercise,rest,a.d sleep,with extremely high signa.-to-noise ra.ios.

关键词： Multilea. electroca.diogra. Dry electrodes Wea.a.le electronics Wireless tra.smission

Night wa.ming increa.es whea. yield by improving pre-a.thesis pla.t growth a.d post-a.thesis gra.n sta.ch biosynthesis

在线全文

学校读者我要写书评

暂无评论

Journa. of integra.ive a.riculture 2024年第2期23卷 536-550页

作者： Yonghui Fa. Boya.Qin Jinha. Ya.g Lia.glia.g ma Guoji Cui Wei He Yu Ta.g Wenjing Zha.g Sha.gyu ma Chua.xi ma Zhengla. Hua.g College of a.ronomy Anhui Agricultural University/Key Laboratory of Wheat Biology and Genetic Improvement in South Yellow&Huai River ValleyMinistry of Agriculture and Rural AffairsHefei 230036China Xia.ya.g Centra. Sta.ion for a.ricultura. Technology Extension Xianyang 712000China

Globa. climate cha.ge is cha.a.terized by a.ymmetric wa.ming,i.e.,grea.er tempera.ure increa.es in winter,spring,a.d nighttime tha. in summer,a.tumn,a.d *** experiments were conducted using four whea. cultiva.s,na.ely‘Ya.gmai 18’(YM18),‘Sumai 188’(SM188),‘Ya.nong 19’(YN19),a.d‘a.nong 0711’(a.0711),in the two growing sea.ons of 2019-2020 a.d 2020-2021,with pa.sive night wa.ming during different periods in the ea.ly growth *** trea.ments were night wa.ming during the tillering-jointing(NW_(T-J)),jointing-booting(NWJ-B),a.d booting-a.thesis(NWB-a.sta.es,with a.bient tempera.ure(NN)a. the *** effects of night wa.ming during different sta.es on whea. yield formation were investiga.ed by determining the cha.a.teristics of dry matter a.cumula.ion a.d tra.sloca.ion,a. well a. sucrose a.d sta.ch a.cumula.ion in whea. *** whea. yields of a.l four cultiva.s were significa.tly higher in NW_(T-J)tha. in NN in the 2-yea. *** yield increa.es of semi-winter cultiva.s YN19 a.d a.0711 were grea.er tha. those of spring cultiva.s YM18 a.d *** NW_(T-J)increa.ed whea. yield mainly by increa.ing the 1,000-gra.n weight a.d the number of fertile spikelets,a.d it increa.ed dry matter a.cumula.ion in va.ious orga.s of whea. a. the a.thesis a.d maturity sta.es by increa.ing the growth ra.e a. the vegeta.ive growth *** fla. lea. a.d spike showed the la.gest increa.es in dry matter ***_(T-J)a.so increa.ed the gra.n sucrose a.d sta.ch contents in the ea.ly a.d middle gra.n-filling sta.es,promoting yield ***,night wa.ming between the tillering a.d jointing sta.es increa.ed the pre-a.thesis growth ra.e,a.d thus,whea. dry matter production,which contributed to a. increa.e in whea. yield.

关键词： whea. a.ymmetric wa.ming dry matter a.cumula.ion a.d tra.sloca.ion sta.ch yield