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CToMP: a.cycle-ta.k-oriented memory protection scheme for unma.ned systems

Science China.Informa.ion Sciences) 2024年第6期67卷 399-417页

作者： Chengya. Ma.Ning XI di LU Yebo FENG Jia.feng ma School of Cyber Engineering Xidian University School of Computer Science a.d Technology Xidian University depa.tment of Computer a.d Informa.ion Science University of Oregon

Memory corruption a.ta.ks(MCa.) refer to ma.icious beha.iors of system intruders tha. modify the contents of a.memory loca.ion to disrupt the norma. opera.ion of computing systems, ca.sing lea.a.e of sensitive da.a.or perturba.ions to ongoing processes. Unlike genera.-purpose systems, unma.ned systems ca.not deploy complete security protection schemes, due to their limita.ions in size, cost a.d *** in unma.ned systems a.e pa.ticula.ly difficult to defend a.a.nst. Furthermore, MCa. ha.e diverse a.d unpredicta.le a.ta.k interfa.es in unma.ned systems, severely impa.ting digita. a.d physica. sectors. In this pa.er, we first genera.ize, model a.d ta.onomize MCa. found in unma.ned systems currently, la.ing the founda.ion for designing a.porta.le a.d genera. defense a.proa.h. a.cording to different a.ta.k mecha.isms,we found tha. MCa. a.e ma.nly ca.egorized into two types — return2libc a.d return2shellcode. To ta.kle return2libc a.ta.ks, we model the erra.ic opera.ion of unma.ned systems with cycles a.d then propose a.cycle-ta.k-oriented memory protection(CToMP) a.proa.h to protect control flows from ta.pering. To defend a.a.nst return2shellcode a.ta.ks, we introduce a.secure process sta.k with a.ra.domized memory a.dress by levera.ing the memory pool to prevent Shellcode from being executed. Moreover, we discuss the mecha.ism by which CTo MP resists the return-oriented progra.ming(ROP) a.ta.k, a.novel va.ia.t of return2libc a.ta.ks. Fina.ly, we implement CTo MP on CUa. V5+ with a.dupilot a.d Cra.yflie. The eva.ua.ion a.d security a.a.ysis results demonstra.e tha. the proposed a.proa.h CTo MP is resilient to va.ious MCa. in unma.ned systems with low footprints a.d system overhea..

关键词： unma.ned system memory corruption a.ta.k memory protection system security ra.domized memory a.dress

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

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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 deforma.ion 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 ma.hema.ica. 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 deforma.ion 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 ma.ntena.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

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3d simula.ion of ima.e-defined complex interna. fea.ures using the numerica. ma.ifold method

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Science China.Technologica. Sciences) 2024年第4期67卷 1023-1039页

作者： WU Jie Ma.GuoWei School of Civil a.d Tra.sporta.ion Engineering Hebei University of TechnologyTianjin 300401China Tia.jin Key La.ora.ory for Prefa.rica.ed Building a.d Intelligent Construction Tianjin 300401China

The numerica. simula.ion of interna. fea.ures,such a. inclusions a.d voids,is importa.t to a.a.yze their impa.t on the performa.ce of composite ***,the complex geometries of interna. fea.ures a.d the induced continuous-discontinuous(C-d)deforma.ion fields a.e cha.lenges to their numerica. *** this study,a.3d a.proa.h using a.simple mesh to simula.e irregula. interna. geometries is developed for the first *** the help of a.developed voxel cra.k model,ima.e models tha. a.e efficient when recording complex geometries a.e directly imported into the *** reconstructions,which a.e usua.ly la.or-intensive,a.e excluded from this ***,using ima.e models a. the geometric input,ima.e processing techniques a.e a.plied to detect ma.eria. interfa.es a.d develop conta.t ***,the C-d deforma.ions of the complex interna. fea.ures a.e directly ca.cula.ed ba.ed on the numerica. ma.ifold *** a.cura.y a.d convergence of the developed3d a.proa.h a.e exa.ined ba.ed on multiple *** 3d C-d simula.ion of sa.dstones with na.ura.ly formed complex microfea.ures demonstra.es the ca.a.ility of the developed a.proa.h.

关键词： 3d continuous-discontinuous simula.ion ima.e-ba.ed simula.ion complex interna. fea.ures numerica. ma.ifold method voxel cra.k model structured mesh

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Two-dimensiona. Meta.lophtha.ocya.ine Na.oma.eria.s for Electroca.a.ytic Energy Conversion

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Energy & Environmenta. Ma.eria.s 2024年第4期7卷 364-385页

作者： Xinqi Wa.g Sha.hui Sun Jia.a. Ya. Ha. Wa. Renzhi Ma.Wei ma School of Chemica. Engineering a.d Zhongyua. Critica. Meta.s La.ora.ory Zhengzhou University Resea.ch Center for Ma.eria.s Na.oa.chitectonics (Ma.a. National Institute for Materials Science (NIMS)

Crowing energy dema.d drives the ra.id development of clea. a.d relia.le energy *** the pa.t yea.s,the explora.ion of novel ma.eria.s with considera.le efficiency a.d dura.ility ha. dra.n a.tention in the a.ea.of elec... 详细信息

关键词： conjuga.ed na.ostructure electroca.a.ysis 2d meta.lophtha.ocya.ines

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Supported Recycla.le Meta.-free Frustra.ed Lewis Pa.r Ca.a.yst for Ca.a.ytic Hydrogena.ion of Substituted Pyridines to Piperidines

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Chemica. Resea.ch in Chinese Universities 2024年第4期40卷 682-689页

作者： Ma.Sha.hua.Ta.G Zhiyong Ca. Key La.ora.ory for Na.osystem a.d Hiera.chica. Fa.rica.ion CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing100190P.R.China University of Chinese a.a.emy of Sciences Beijing100049P.R.China

The construction of heterogeneous frustra.ed Lewis pa.rs(FLPs)ca.a.ysts is crucia. for rea.izing highly efficient a.d recycla.le pyridines ca.a.ytic *** this work,we prepa.ed a.recycla.le heterogenous FLPs ca.a.yst CMP-BF with conjuga.ed microporous polymer CMP-ethynyl a. the support via.self-ca.a.yzed 1,1-ca.bobora.ion rea.tion with commercia. Lewis a.id B(C_(6)F_(5))_(3).The a.-synthesized CMP-BF demonstra.es superior heterogenous ca.a.ytic hydrogena.ion performa.ce(conversion>99%),a.d considera.le sta.ility(84%conversion a.ter three cycles)in recycla.le hydrogena.ion of 2,*** work provides insights into the fa.rica.ion a.d ca.a.ytic a.plica.ion of recycla.le heterogenous FLP ca.a.ysts.

关键词： Pyridine hydrogena.ion Frustra.ed Lewis pa.r Conjuga.ed microporous polymer

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Exploring the functiona. roles of sma.l-molecule meta.olites in disea.e resea.ch:Recent a.va.cements in meta.olomics

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Chinese Chemica. Letters 2024年第8期35卷 93-100页

作者： a.lei Ta. Xia.xia. ma depa.tment of Precision Instrument Tsinghua UniversityBeijing 100084China

Meta.olism encompa.ses a.series of intrica.e biochemica. processes tha. a.e vita. for the sustena.ce of life in ***,a. essentia. scientific discipline,is a.field of study within the broa.er doma.n of systems biology tha. focuses on the comprehensive a.a.ysis of sma.l molecules,known a. meta.olites including lipids,coenzymes,etc.,which a.e synthesized during *** the contin-uous development of meta.olomics,the multiple biologica. functions of meta.olites a.e consta.tly being discovered,encompa.sing signa. tra.sduction a.d enzyme stimula.ion,while concurrently exhibiting a.-socia.ions with a.flictions like ca.cer a.d *** comprehension of meta.olite functiona.ities a.d their intrica.e interpla. with disea.e conditions a.sumes pa.a.ount importa.ce in both disea.e-focused resea.ch endea.ors a.d the development of dia.nostic *** schola.ly exposition underta.es a. ex-tensive review of recent a.va.cements in the investiga.ion of functiona. roles a.sumed by meta.olites,with specific empha.is on meta.olites in lipid synthesis,glucose meta.olism a.d exogenous meta.olites.

关键词： Meta.olites Sma.l molecules Biologica. functions Physiologica. processes disea.es

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Two-sta.e a.ing trea.ment to a.celera.e a.ing kinetics without impa.ring strength in B_4C/7a.4a. composite

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Science China.Technologica. Sciences) 2024年第8期67卷 2485-2492页

作者： CHEN YunTa. Ma.GuoNa. ZHU ShiZe Wa.G dong XIa. BoLv Ma.ZongYi Shi-Cha.gxu Innova.ion Center for a.va.ced Ma.eria.s Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Ma.eria.s Science a.d Engineering University of Science and Technology of ChinaShenyang 110016China Centre of Excellence for a.va.ced Ma.eria.s Dongguan 523808China

a.ing trea.ments a.e the key process to obta.n sa.isfa.tory strength for 7xxxa. a.loys a.d their composites. However, tra.itiona. single-sta.e(SS) a.ing is time-consuming to rea.h a.pea. strength condition. In this study, a. efficient 120℃ + 160℃ two-sta.e(TS) a.ing trea.ment wa. proposed on a.B_4C/7a.4a. composite fa.rica.ed via.powder meta.lurgy(PM) technology, which could a.quire simila. pea.-a.ing strength but only took a.out 15% of the time compa.ed to tra.itiona. 120℃ SS a.ing. The evolution of precipita.ion during the TS a.ing wa. investiga.ed, a. well a. those of the 7a.4a. a.loys for compa.ison. In the second sta.e a.ing process, the higher a.ing tempera.ure a.celera.ed the nuclea.ion of η′ pha.es inside the gra.ns a.d thus increa.ed the density of precipita.es. Moreover, the short a.ing time limited the coa.sening of precipita.es a.d the broa.ening of precipita.efree zones. The a.ove fa.tors were beneficia. for quickly obta.ning sa.isfa.tory precipita.ion strengthening effects. The B_4C/7a.4a. composite exhibited slower a.ing kinetics tha. the 7a.4a. a.loy in the TS a.ing. Mg elements consumption by the chemica. rea.tion between B impurities introduced by B_4C pa.ticles a.d the a. ma.rix wa. considered to potentia.ly reta.d the a.ing kinetics of the B_4C/7a.4a. composite. Nevertheless, the precipita.ion sequence wa. not a.fected.

关键词： a.uminum ma.rix composites a.ing trea.ment powder meta.lurgy mecha.ica. properties precipita.ion

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Qua.tifying Contribution of Recycled Moisture to Precipita.ion in Tempera.e Gla.ier Region,Southea.tern Tibeta. Pla.ea.,China

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Chinese Geogra.hica. Science 2024年第4期34卷 764-776页

作者： Ma.Ya.wei PU Ta. SHI Xia.yi Ma.Xingga.g YU Hongmei College of Geogra.hy a.d Environmenta. Sciences Zhejiang Normal UniversityJinhua 321004China Na.iona. Field Science Observa.ion a.d Resea.ch Sta.ion of Yulong Snow Mounta.n Cryosphere a.d Susta.na.le development Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Sta.e Key La.ora.ory of Cryospheric Sciences Northwest Institute of Eco-environment and ResourcesChinese Academy of SciencesLanzhou 730000China

Recycled moisture is a. importa.t indica.or of the renewa. ca.a.ity of regiona. wa.er *** to the existence of Yulong Snow Mounta.n,Lijia.g in Yunna. Province,southea.t of the Qingha.-Tibet Pla.ea.,China.is the closest ocea. gla.ier a.ea.to the equa.or in *** precipita.ion sa.ples were collected from 2017 to 2018 in Lijia.g to qua.tify the effect of sub-cloud eva.ora.ion a.d recycled moisture on precipita.ion combined with the d-excess model during monsoon a.d non-monsoon *** results indica.ed tha. the d-excess va.ues of precipita.ion fluctua.ed between–35.6‰a.d 16.0‰,with a. a.ithmetic mea. of 3.5‰.The loca. meteoric wa.er line(LMWL)wa.δd=7.91δ^(18)O+2.50,with a.slope slightly lower tha. the globa. meteoric wa.er line(GMWL).Subcloud eva.ora.ion wa. higher during the non-monsoon sea.on tha. during the monsoon *** tended to pea. in Ma.ch a.d wa. prima.ily influenced by the rela.ive *** source of the wa.er va.our a.fected the proportion of recycled *** to the results of the Hybrid Single-Pa.ticle La.ra.gia. Integra.ed Tra.ectory(HYSPLIT)model,the ma.n sources of wa.er va.our in Lijia.g a.ea.during the monsoon period were the southwest a.d southea.t *** the non-monsoon period,wa.er va.our wa. tra.sported by a.southwesterly *** recycled moisture in Lijia.g a.ea.between Ma.ch a.d October 2017 wa. 10.62%.La.ge va.ia.ions were observed between the monsoon a.d non-monsoon sea.ons,with va.ues of 5.48%a.d 25.65%,*** differences were prima.ily a.tributed to va.ia.ions in the a.vection of wa.er *** recycled moisture ha. pla.ed a.supplementa.y role in the precipita.ion of Lijia.g a.ea.

关键词： recycled moisture sta.le isotope precipita.ion d-excess Hybrid Single-Pa.ticle La.ra.gia. Integra.ed Tra.ectory(HYSPLIT)model southea.tern Tibeta. Pla.ea. China

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Electrica. stimula.ion for brighter persistent luminescence

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Light(Science & a.plica.ions) 2024年第8期13卷 1590-1601页

作者： Xilin Ma.Yuhua.Wa.g Ta.a.oshi Seto Key La.ora.ory for Specia. Function Ma.eria.s a.d Structura. design of the Ministry of Educa.ion National&Local Joint Engineering Laboratory for Optical Conversion Materials and Technology of National Development and Reform CommissionDepartment of Materials ScienceSchool of Materials and EnergyLanzhou UniversityNo.222South Tianshui RoadLanzhouGansu 730000China

a. imma.ure understa.ding of the mecha.isms of persistent luminescence(PersL)ha. hindered the development of new persistent luminescent ma.eria.s(PersLMs)with increa.ed *** this rega.d,in-situ direct current(dC)electric field mea.urements were conducted on a.la.ered structure composed of the Sra._(2)O_(4):Eu^(2+),dy^(3+)phosphor,a.d a. *** this study,the photoluminescence(PL)a.d a.terglow properties were investiga.ed with respect to volta.e by a.a.yzing the current signa. a.d thermoluminescence(TL)*** intensity of PersL increa.ed due to a.novel phenomenon known a.“externa. electric field stimula.ed enha.cement of initia. brightness of a.terglow”.This dyna.ic process wa. illustra.ed via.the use of a.ra.e equa.ion a.proa.h,where the electrons tra.ped by the ultra.sha.low tra. a. 0.022 eV could be tra.sferred through the conduction ba.d during long *** a.terglow intensity could rea.h 0.538 cdm^(-2)a. a.6 V electric *** design of a. electric field stimula.ion technique ena.les the enha.cement of the intensity of PersLMs a.d provides a.new perspective for exploring the funda.enta. mecha.ics of certa.n esta.lished PersLMs.

关键词： spectroscopy luminescence conduction

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a.rigorous rea.-time a.oustic positioning method for ocea. bottom seismic explora.ion

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Sa.ellite Na.iga.ion 2024年第1期5卷 168-190页

作者： Jinye Ma.Shouchua. Fa.g Jia.hu Zha. School of Geodesy a.d Geoma.ics Wuhan University129 Luoyu RoadWuhan430079China Institute of Ma.ine Science a.d Technology Wuhan UniversityWuhan430079China Surveying Service Center BGP Inc.CNPCZhuozhou072751HebeiChina

The conventiona. technique for positioning sea.loor geophones in ocea. bottom seismic explora.ion encounters severa. cha.lenges,including the significa.t impa.t of outliers on positioning results,underutiliza.ion of high-precision observa.ions,a.d low efficiency in rea.-time da.a.*** issues inevita.ly a.fect the qua.ity of seismic explora.ion *** a.dress these cha.lenges a.d enha.ce the a.cura.y of geophone positioning,this pa.er proposes a.rigorous rea.-time a.oustic positioning method for geophones ba.ed on sequentia. a.justment a.d Ba.rda.s outlier detection *** proposed method comprises three key steps:grouping the origina. a.oustic observa.ions,constructing the intra.group a.oustic positioning model,a.d synthesizing the positioning results a.ross the different *** va.idity a.d pra.tica.ity of this a.proa.h a.e confirmed through a.simula.ion experiment a. well a. the field experiment conducted in the Boha. Sea.*** results demonstra.e tha. the proposed method effectively elimina.es outliers in the origina. observa.ions a.d ma.imizes the utiliza.ion of high-qua.ity *** to tra.itiona. a.oustic positioning methods,it significa.tly reduces positioning errors from meters to decimeters,a.d in some ca.es ca. a.hieve centimeter-level *** the sound velocity profile in the opera.ing sea.a.ea.is mea.ured,the method ca. a.ta.n the posterior sta.da.d devia.ion a. the millimeter level a.d positioning errors within 10 *** the sound velocity profile is unknown,the method ca. a.hieve the posterior sta.da.d devia.ion a. centimeter-level a.d positioning errors of a.proxima.ely 20 cm.

关键词： Ocea. bottom seismic explora.ion Geophone positioning a.oustic positioning method Sequentia. a.justment Outlier detection

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