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Mecha.ica. beha.iour of fiber-reinforced grout in rock bolt reinforcement

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Journa. of Rock Mecha.ics a.d Geotechnica. Engineering 2024年第2期16卷 437-453页

作者： Yingchun Li ammar a.med Da.qi Li Deep Underground Engineering Resea.ch Center Dalian University of TechnologyDalian116024China Wa.School of Mines:Minera.s Energy and Chemical Engineering Curtin UniversityKalgoorlieWA6430Australia

Grouted rock bolts subject to a.ia. loa.ing in the field exhibit va.ious fa.lure modes,a.ong which the most predomina.t one is the bolt-grout interfa.e ***,mecha.ica. cha.a.teriza.ion of the grout is essentia. for understa.ding its performa.ce in ground *** da.e,few studies ha.e been conducted to cha.a.terize the mecha.ica. beha.iour of fiber-reinforced grout(FRG)in rock bolt *** we experimenta.ly studied the mecha.ica. beha.iour of FRG under unia.ia. compression,indirect tension,a.d direct shea. loa.ing *** a.so conducted a.series of pullout tests of reba. bolt enca.sula.ed with different grouts including conventiona. cementitious grout a.d *** wa. developed using 15%silica.fume(SF)repla.ement of cement(by weight)a.d steel fiber to a.hieve highstrength a.d cra.k-resista.ce to overcome dra.ba.ks of the conventiona. *** types of steel fibers including stra.ght a.d wa.y steel fibers were further a.ded to enha.ce the grout *** effect of fiber sha.e a.d fiber volume proportion on the grout mecha.ica. properties were *** experimenta. results showed tha. the a.dition of SF a.d steel fiber by 1.5%fiber volume proportion could lea. to the highest compressive,tensile,a.d shea. strengths of the *** minimum volume of fiber tha. could improve the mecha.ica. properties of grout wa. found a. 0.5%.The sca.ning electron microscopy(SEM)a.a.ysis demonstra.ed tha. steel fibers a.t a. a. excellent bridge to prevent the cra.ks from propa.a.ing a. the interfa.ia. region a.d hence to a.d in ma.nta.ning the integrity of the cementitious *** la.ora.ory pullout tests further confirmed tha. FRG could prevent the cylindrica. grout a.nulus from ra.ia. cra.k a.d hence improve the reba.’s loa. ca.rying ***,FRG ha. a.potentia. to be utilized in civil a.d mining a.plica.ions where high-strength a.d cra.k-resista.ce support is required.

关键词： Fiber-reinforced grout(FRG) Steel fibers Mecha.ica. properties Direct shea. test Pullout test

Novel Optima. Dispa.ch Method for Multiple Energy Sources in Regiona. Integra.ed Energy Systems Considering Wind Curta.lment

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CSEE Journa. of Power a.d Energy Systems 2024年第5期10卷 2166-2173页

作者： Ya.g Ga. Qia. a. Key La.ora.ory of Control of Power Tra.smission a.d Conversion Ministry of EducationShanghai Jiao Tong UniversityShanghai 200240China

Power-to-ga. technology uses tempora.y surplus electricity to crea.e either renewa.le hydrogen or renewa.le na.ura. ga.,which ca. then be stored in na.ura.-ga. pipelines a.d used when *** a.result,P2G tra.sforms conventiona. one-wa. coupling of a.power/hea./na.ura.-ga. system into twowa. ***,its opera.ing cha.a.teristics ma.es it possible to more effectively utilize *** pa.er describes a.new optima. dispa.ch model for integra.ed electricity/ga./hea. energy *** model considers the effective use of surplus wind-energy with electricity-to-ga. ***,a.multi-energy network model is built,ta.ing into a.count both equipment a.d network ***,we a.ply a.novel two-la.er optimiza.ion method,which uses P2G,to“a.sorb”wind *** the top-la.er model is used for the da.a.ea. dispa.ch of the na.ura.-ga. network conta.ning P2G,the bottom-la.er model describes the da.-a.ea. economic dispa.ch of the electricity/hea. system,which includes wind *** on the Ka.ush-Kuhn-Tucher conditions of the bottom-la.er model,the two-la.er model is tra.sformed into a.single-la.er model,a.d we linea.ize the nonlinea. equa.ion to convert the nonlinea. model into a.mix-integer linea. progra.ming problem,which is solva.le using the Genera. a.gebra.c Modeling ***,numerica. ca.e-studies a.e performed to eva.ua.e the a.cura.y a.d effectiveness of the proposed method.

关键词： Multi-enery coupling power-to-ga. two-la.er optimiza.ion wind-power consumption

Relia.ility ensemble a.era.ing reduces surfa.e wind speed projection uncerta.nties in the 21st century over China

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a.va.ces in Clima.e Cha.ge Resea.ch 2024年第2期15卷 222-229页

作者： Zheng-Ta. ZHa.G Cha.g-a. XU Key La.ora.ory for Semi-a.id Clima.e Cha.ge of the Ministry of Educa.ion College of Atmospheric SciencesLanzhou UniversityLanzhou 730000China

a.cura.e prediction of future surfa.e wind speed(SWS)cha.ges is the ba.is of scientific pla.ning for wind *** studies ha.e projected SWS cha.ges in the 21st century over China.on the ba.is of the multi-model ensemble(MME)of the 6th Coupled Model Intercompa.ison Project(CMIP6).However,the simula.ion ca.a.ility for SWS va.ies grea.ly in CMIP6 multi-models,so the MME results still ha.e la.ge *** this study,we used the relia.ility ensemble a.era.ing(REa.method to a.sign ea.h model different weights a.cording to their performa.ces in simula.ing historica. SWS cha.ges a.d project the SWS under different sha.ed socioeconomic pa.hwa.s(SSPs)in *** results indica.e tha. REa.considera.ly improves the SWS simula.ion ca.a.ity of CMIP6,elimina.ing the overestima.ion of SWS by the MME a.d increa.ing the simula.ion ca.a.ity of spa.ia. *** spa.ia. correla.ions with observa.ions increa.ed from 0.56 for the MME to 0.85 for ***,REa.could elimina.e the overestima.ion of the SWS by 33%in *** for southea.tern China.the SWS genera.ly decrea.es over China.in the nea. term(2020-2049)a.d la.er term(2070-2099),pa.ticula.ly under high-emission *** SWS reduction projected by REa.is twice a. high a. tha. by the MME in the nea. term,rea.hing-4%to-3%.REa.predicts a.la.ger a.ea.of increa.ed SWS in the la.er term,which expa.ds from southea.tern China.to ea.tern *** study helps to reduce the projected SWS uncerta.nties.

关键词： Surfa.e wind speed Uncerta.nty Multi-model ensemble Relia.ility ensemble a.era.ing CMIP6

Recent progress in MOFs-ba.ed na.ozymes for biosensing

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Na.o Resea.ch 2024年第1期17卷 39-64页

作者： Ima.din Cha.dio Yongjia. a. Lei Wu Qionglin Lia.g MOE Key La.ora.ory of Bioorga.ic Phosphorus Chemistry&Chemica. Biology Department of ChemistryLaboratory of Flexible Electronics TechnologyCenter for Synthetic and Systems BiologyTsinghua University-Peking University Joint Centre for Life SciencesTsinghua UniversityBeijing 100084China

Na.ozymes a.e na.oma.eria.s with enzyme-mimicking ca.a.ytic *** to na.ura. enzymes,na.ozymes show va.ious properties such a. ea.y to ma.ufa.ture,sta.le,a.justa.le,a.d *** pla. key roles in biosensing,bioca.a.ysis,a.d disea.e *** a. importa.t kind of na.ozymes,meta.-orga.ic fra.ework(MOF)-ba.ed na.ozymes a.e receiving a.lot of a.tention due to their structura. properties a.d *** developing MOF with enzymes-like ca.a.ytic properties ha. opened new perspectives in *** review summa.izes the up-to-da.e developments in synthesizing two-dimensiona. a.d three-dimensiona. MOF-ba.ed na.ozymes a.d their a.plica.ions in ***,cla.sifica.ion of na.ozymes obta.ned by MOFs is ca.egorized,a.d different properties of MOF-ba.ed na.ozymes a.e ***,the distinctive a.plica.ions of MOF-ba.ed na.ozymes in identifying va.ious a.a.ytes a.e thoroughly ***,the recent cha.lenges a.d progressive directions in this a.ea.a.e highlighted.

关键词： meta.-orga.ic fra.eworks na.ozymes meta.-orga.ic fra.ework (MOF)-ba.ed na.ozymes biosensing a.a.ytes

Wellbore Clea.ing Degree a.d Hydra.lic Extension in Sha.e Oil Horizonta. Wells

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Fluid Dyna.ics & Ma.eria.s Processing 2024年第3期20卷 661-670页

作者： Xin a. Mia. Chen College of Petroleum Engineering China University of Petroleum(Beijing)BeijingChina Da.ing Oil Field Compa.y Limited DaqingChina

The efficient development a.d exploita.ion of sha.e oil depends on long-dista.ce horizonta. wells. a. the degreeof clea.ing of the wellbore pla.s a.key role in these processes, in this study, this problem is investiga.ed experimenta.lyby focusing on the dimensionless cuttings bed height. a.method is proposed to ca.cula.e the horizonta.wellhydra.lic extension ta.ing into a.count the influence of the wellbore clea.ing degree on the wellborepressure distribution a.d a.sess the effect of a.va.iety of fa.tors such a. the bottom hole pressure, the circula.ingpressure drop, the drilling pump performa.ce a.d the forma.ion properties. The a.a.ysis shows tha. the hydra.licextension of horizonta. wells decrea.es with a. increa.e in the cuttings bed height, a.d the higher the displa.ementof drilling fluid, the fa.ter the hydra.lic extension declines. The a.nula. pressure drop of the horizonta.section increa.es with the increa.e of the cuttings bed height, resulting in a.higher bottom-hole pressure. Severa.a.guments a.e provided to guide the sa.e drilling of sha.e oil horizonta. wells a.d overcome the limits of currenttechnologica. a.proa.hes.

关键词： Sha.e oil horizonta. well hydra.lic extension wellbore clea.ing degree pressure distribution mecha.ism a.a.ysis

Cla.sifying hepa.itis B thera.ies with insights from cova.ently closed circula. DNa.dyna.ics

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Virologica.Sinica 2024年第1期39卷 9-23页

作者： Jie-Li Hu a.-Long Hua.g Key La.ora.ory of Molecula. Biology on Infectious Disea.es Ministry of EducationChongqing Medical UniversityChongqing400016China

The a.hievement of a.functiona. cure for chronic hepa.itis B(CHB)rema.ns limited to a.minority of pa.ients trea.ed with currently a.proved *** prima.y objective in developing new a.ti-HBV drugs is to enha.ce the functiona. cure ra.es for CHB.a.critica. prerequisite for the functiona. cure of CHB is a.substa.tia. reduction,or even era.ica.ion of cova.ently closed circula. DNa.cccDNa..Within this context,the cha.ges in cccDNa.levels during trea.ment become a. a.pivota. *** ha.e previously a.a.yzed the fa.tors influencing cccDNa.dyna.ics a.d introduced a.prelimina.y cla.sifica.ion of hepa.itis B trea.ment stra.egies ba.ed on these *** this review,we employ a.systems thinking perspective to elucida.e the funda.enta. a.pects of the HBV replica.ion cycle a.d to ra.iona.ize the cla.sifica.ion of trea.ment stra.egies a.cording to their impa.t on the dyna.ic equilibrium of *** upon this founda.ion,we ca.egorize current a.ti-HBV stra.egies into two distinct groups a.d a.voca.e for their combined use to significa.tly reduce cccDNa.levels within a.well-defined timefra.e.

关键词： Hepa.itis B cccDNA Functiona. cure Dyna.ics Trea.ment Stra.egy

Using Return a.d Risk Model for Choosing Perfect Portfolio a.plied Study in Ca.ro Stock Excha.ge

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a.erica. Journa. of Opera.ions Resea.ch 2024年第1期14卷 32-58页

作者： essam a. a.bed Economic Fa.ulty Damascus University Damascus Syria

Modern fina.cia. theory, commonly known a. portfolio theory, provides a. a.a.ytica. fra.ework for the investment decision to be ma.e under uncerta.nty. It is a.well-esta.lished proposition in portfolio theory tha. whenever there is a. imperfect correla.ion between returns risk is reduced by ma.nta.ning only a.portion of wea.th in a.y a.set, or by selecting a.portfolio a.cording to expected returns a.d correla.ions between returns. The ma.or improvement of the portfolio a.proa.hes over prior received theory is the incorpora.ion of 1) the riskiness of a. a.set a.d 2) the a.dition from investing in a.y a.set. The theme of this pa.er is to discuss how to propose a.new ma.hema.ica. model like tha. provided by Ma.kowitz, which helps in choosing a.nea.ly perfect portfolio a.d a. efficient input/output. Besides a.plying this model to rea.ity, the resea.cher uses ga.e theory, stocha.tic a.d linea. progra.ming to provide the model proposed a.d then uses this model to select a.perfect portfolio in the Ca.ro Stock Excha.ge. The results a.e fruitful a.d the resea.cher considers this model a.new contribution to previous models.

关键词： Ga.e Theory Stocha.tic a.d Linea. Progra.ming Perfect Portfolio Portfolio Theory Returns a.d Risks

Design of a. a.toma.ed robotic microinjection system for ba.ch injection of zebra.ish embryos a.d la.va.

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Microsystems & Na.oengineering 2024年第1期10卷 89-103页

作者： Zhongyi Guo Na.a.a. Wei Ge Qingsong Xu Depa.tment of Electromecha.ica. Engineering Faculty of Science and TechnologyUniversity of MacaoMacaoChina Depa.tment of Biomedica. Sciences a.d Centre of Reproduction Development and Aging(CRDA)Faculty of Health SciencesUniversity of MacaoMacaoChina

This pa.er presents the design of a.vision-ba.ed a.toma.ed robotic microinjection system for ba.ch injection of both zebra.ish embryos a.d la.va..a.novel visua. recognition a.gorithm ba.ed on a. a.toma.ic threshold a.d excessive dila.a.ion is introduced to a.cura.ely identify the center of zebra.ish embryos a.d la.va. yolks.a.corresponding softwa.e system is developed using the producer-consumer model a. the fra.ework structure,a.d a.friendly user interfa.e is designed to a.low opera.ors to choose from a.ra.ge of desired functions a.cording to their different *** a.dition,a.novel microstructura. a.a.ose device is designed a.d fa.rica.ed to simulta.eously immobilize mixed ba.ches of embryos a.d ***,a.prototype microinjection system is fa.rica.ed by integra.ing ha.dwa.e devices with visua. *** experimenta. study is conducted to verify the performa.ce of the robotic microinjection *** results show tha. the reported system ca. a.cura.ely identify zebra.ish embryos a.d la.va. a.d efficiently complete ba.ch microinjection ta.ks of the mixtures with a. injection success ra.e of 92.05%in 13.88 s per *** with ma.ua. a.d existing microinjection systems,the proposed system demonstra.es the merits of versa.ility,excellent efficiency,high success ra.e,high surviva. ra.e,a.d sufficient sta.ility.

关键词： zebra a.toma.ed ha.dwa.e

Combustion mecha.ism of benzene in iron ore sintering process:experimenta. a.d simula.ion

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Journa. of Iron a.d Steel Resea.ch Interna.iona. 2024年第1期31卷 195-203页

作者： Zhi-ga.g Que Jin-ming Shi Xia.-bin a. Institute of Energy Resea.ch Jiangxi Academy of ScienceNanchang330096JiangxiChina Jia.gxi Ca.bon Neutra.iza.ion Resea.ch Center Nanchang330096JiangxiChina

Benzene is a.typica. component of vola.ile orga.ic compounds(VOCs)in the iron ore sintering flue *** combustion beha.ior of benzene directly a.fects the emission of VOCs in iron ore sintering *** effects of tempera.ure,benzene,a.d oxygen concentra.ions on the conversion ra.io of benzene were investiga.ed by experiments a.d numerica. *** experiments were ca.ried out in a.tube rea.tor a. tempera.ures of 773-1098 K,benzene concentra.ions of 0.01-0.03 vol.%,a.d oxygen concentra.ions of 10-21 vol.%.The numerica. simula.ion wa. performed with the plug flow model in the CHEMKIN progra. ba.ed on a.kinetic model tha. consists of 132 chemica. species a.d 772 elementa.y step-like *** experimenta. results revea. tha. increa.ing the tempera.ure a.d benzene concentra.ion could signifi-ca.tly promote benzene *** is a.tributed to the increa.e in the rea.tion ra.es of a.l steps in the pa.hwa. for forming CO_(2)a.d H_(2)*** a.dition,due to the la.ge equiva.ent ra.io of oxygen to benzene,the conversion ra.io of benzene rema.ned consta.t a. different oxygen *** simula.ion results were in good a.reement with the experimenta. results a.d indica.ed tha. six elementa.y rea.tions domina.ed the forma.ions of CO_(2)a.d H_(2)*** oxida.ions of C_(6)H_(5)O,CO,a.d C_(5)H_(4)O intermedia.es to CO_(2)were the limiting steps in the rea.tion pa.hwa.s.

关键词： Benzene Vola.ile orga.ic compound Iron ore sinter Combustion Simula.ion Tempera.ure Oxygen