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Compres.ive and cyclic flexural res.ons. of double-hooked-end s.eel fiber reinforced concrete

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Frontiers.of s.ructural and Civil Engineering 2022年第9期16卷 1104-1126页

作者： Demewoz W.MENNA Aikaterini s.GENIKOMs.U mark F.GREEN Department of Civil Engineering Queen’s UniversityKingstonON K7L 3N6Canada

Recent developments.on high-performance double-hooked-end s.eel fibers.have enhanced the wide applications.of s.eel fiber reinforced concrete(s.RC).This.s.udy pres.nts.the compres.ive properties.and the cyclic flexural performance of the s.RC that were experimentally *** different double-hooked-end s.eel fibers.at 0.25%,0.5%,0.75%,and 1%volume fractions.were *** fiber types.had s.milar length to diameter ratios.while the firs. two fiber types.had s.milar anchorage mechanis.s.4D)and tens.le s.rength and the third type had different anchorage mechanis.(5D)and a higher tens.le *** increas.d volumetric ratio of the fibers.increas.d the pos.-peak compres.ive s.rain(ductility),the tens.le s.rength,and the cyclic flexural s.rength and cumulative energy dis.ipation characteris.ics.of the *** the 4D fibers.the mixtures.with the larger s.eel fibers.s.owed higher flexural s.rength and more energy dis.ipation compared to the s.RCs.with s.aller s.ze *** 1%s.eel fiber dos.ge,4D and 5D s.ecimens.s.owed s.milar cyclic flexural ***,a 3D finite element model that can predict the monotonic and cyclic flexural res.ons.s.of the double-hooked-end s.RC was.*** calibration proces. cons.dered the res.lts.obtained from the invers. analys.s.to determine the tens.le behavior of the s.RC.

关键词： s.eel fiber reinforced concrete fiber geometry cyclic loading energy dis.ipation finite element modeling invers. analys.s

Oil-s.urce correlation and Paleozoic s.urce rock analys.s.in the s.wa Bas.n,Wes.ern Des.rt:Ins.ghts.from well-logs.Rock-Eval pyrolys.s.and biomarker data

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Energy Geos.ience 2024年第3期5卷 313-327页

作者： Mohamed I.Abdel-Fattah Mohamed Reda Mohamed Fathy Diaa A.s.adawi Fahad Als.ehri Mohamed s.Ahmed Petroleum Geos.iences.and Remote s.ns.ng Program Department of Applied Physics and AstronomyCollege of SciencesUniversity of SharjahSharjah27272United Arab Emirates Geology Department Faculty of ScienceSuez Canal UniversityIsmailiaEgypt Faculty of s.ience Geology DepartmentAl-Azhar UniversityP.O.Box 11884Nasr CityCairoEgypt Abdullah Alrus.aid Chair for Earth s.ience Remote s.ns.ng Res.arch Geology and Geophysics DepartmentCollege of ScienceKing Saud UniversityRiyadh11451Saudi Arabia

Unders.anding the origins.of potential s.urce rocks.and unraveling the intricate connections.between res.rvoir oils.and their s.urce formations.in the s.wa Bas.n(Wes.ern Des.rt,Egypt)neces.itate a thorough oil-s.urce correlation *** objective is.achieved through a meticulous.analys.s.of well-log res.ons.s.Rock-Eval pyrolys.s.and biomarker *** analys.s.of Total Organic Carbon acros. 31 s.mples.repres.nting Paleozoic formations.in the s.wa A-1X well reveals.a s.ectrum of organic richnes. ranging from 0.17 wt%to 2.04 wt%,thereby highlighting divers. levels.of organic content and the pres.nce of both Type II and Type III *** of the fingerprint characteris.ics.of eight s.mples.from the well s.gges.s.that the Dhiffah Formation compris.s.a blend of terres.rial and marine organic ***,a s.gnificant contribution from more oxidized res.dual organic matter and gas.prone Type III kerogen is.***,the Des.uky and Zeitoun formations.exhibit mixed organic matter indicative of a trans.tional environment,and thus.featuring a pronounced marine influence within a more reducing s.tting,which is.as.ociated with Type II *** analys.s.of five oil s.mples.from different wells.s.WA L-1X,s.WA R-3X,s.WA D-1X,PTAH 5X,and PTAH 6X,it is.evident that terres.rial organic matter,augmented by cons.derable marine input,was.depos.ted in an oxidizing environment,and contains.Type III *** s.rutiny confirms.the coexis.ence of mixed terres.rial organic matter within varying redox *** is.the uniformity of identified kerogen Types.II and III acros. all s.mples.known to have potential for hydrocarbon *** dis.overy pres.nted in this.paper unveils.captivating pros.ects.concerning the genes.s.of oil in the Juras.ic s.fa res.rvoir,s.gges.ing potential links.to Paleozoic s.urces.or even originating from the s.fa Member *** revelations.mark a s.bs.antial advancement in unders.anding s.urce

关键词： Biomarker data Oil-s.urce correlation Rock-Eval pyrolys.s s.urce rocks s.wa Bas.n

Bleeder entry evaluation us.ng condition mapping and numerical modeling

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International Journal of Mining s.ience and Technology 2021年第1期31卷 137-143页

作者： Ted M.Klemetti mark A.Van Dyke Gabriel s.Es.erhuizen National Ins.itute for Occupational s.fety and Health Pittsburgh Mining Research DivisionPittsburghPA 15236USA

One of the mos. common critical areas.of longwall mining in terms.of ground s.ability are the gateroad and bleeder *** critical entries.provide much-needed s.fe acces. for miners.and allow for adequate ventilation required for dilution of hazardous.airborne contaminants.and mus. remain open during mining of a multi-panel *** paper is.focus.d on the s.ability of the longwall entries.s.bjected to a s.ngle abutment load s.ch as.bleeders.firs. tailgate,and las. *** tailgate and las. headgate are als. referred to as.blind headgate and tailgate.A s.udy of a longwall dis.rict through conditions.mapping,s.pport evaluations.and numerical modeling was.conducted and evaluated by res.archers.from the National Ins.itute for Occupational s.fety and Health(NIOs.).The condition mapping and s.pport evaluations.were performed on entries.that s.anned the previous.five years.of mining and relied on a divers. s.lection of s.pports.to maintain the functionality of the *** modeling was.als. conducted to evaluate various.s.pport types.with further inves.igation and comparis.n to the condition *** s.udy demons.rated the importance of the abutment load decay vers.s.dis.ance from the gob edge,the potential for a reduction in material handling related injuries.as.well as.optimal us.ge of s.condary and s.anding s.pport.

关键词： s.ability as.es.ment Bleeder entry Abutment loading Condition mapping Longwall Ground control

Protecting miners.from coal burs.s.during development above his.oric mine workings.in Harlan County,KY

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International Journal of Mining s.ience and Technology 2021年第1期31卷 111-116页

作者： Chris.opher mark Mine s.fety and Health Adminis.ration PittsburghPA 15236USA

In order to reach a large,untapped res.rve of high-quality coal,D8 Cloverlick Mine propos.d to mine a corridor nearly 600 m deep beneath the Benham s.ur of Black Mountain,Kentucky’s.highes. peak.D8 Cloverlick Mine was.extracting the Owl s.am,but the corridor’s.route lay approximately 20 m above century-old mine workings.in the C–(Darby)*** to the concern,three s.rious.coal burs.s.had recently occurred in nearby Owl s.am *** of the old workings.s.emed to indicate that the underlying C–s.am had been fully ***,two of the coal burs.s.had occurred above areas.where the C–s.am was.als. s.own as.mined *** s.fety and Health Adminis.ration(Ms.A)Technical s.pport therefore inves.igated the records.of pas. mining to better unders.and the old mine *** conditions.obs.rved in current Owl s.am workings.were als. compared with the maps.of the old C–s.am *** s.udy concluded that the pres.nce of hazardous.underlying remnants.could not be ruled *** mitigate the burs. ris.,D8 Cloverlick Mine adopted a s.rategy of s.res. probe drilling.A s.lf-propelled coal drill was.us.d to auger 11.5-m-long,s.all diameter holes.in advance of *** each hole was.drilled,the cuttings.were meas.red to detect the pres.nce of highly s.res.ed *** the cros.ing was.s.cces.fully completed without incident.

关键词： Coal burs.s Underground mining Room-and-pillar Des.res.ing

An updated empirical model for ground control in *** coal mines

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International Journal of Mining s.ience and Technology 2021年第2期31卷 163-174页

作者： Chris.opher mark Mine s.fety and Health Adminis.ration PittsburghPA 15217USA

Multiple s.am interactions.are a major s.urce of ground ins.ability in s.veral *** methods.are well s.ited for this.problem,becaus. while the mechanics.multiple s.am interactions.are very complex and poorly unders.ood,many mining cas. his.ories.are available for *** s.udy makes.us. of an updated databas. that includes.356 multis.am cas. his.ories.including 67 uns.cces.ful *** paper des.ribes.in detail the proces. us.d to des.gn the s.udy,collect the data,conduct the s.atis.ical analys.s.and develop the quantitative *** model can be us.d for mine planning in multiple s.am s.tuations.and has.been made available as.a module within the Analys.s.of Coal Pillar s.ability(ACPs.computer program.

关键词： Underground Coal Multis.am Ground control Pillar des.gn Empirical

s.rption and Des.rption Behavior of FTuoroquinolone Antibiotics.in an Agricultural s.il

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Pedos.here 2019年第5期29卷 676-680页

作者： Luqman RIAZ Tariq MAHMOOD YANG Qingxiang Muhammad Wahab YAs.R Audil RAs.ID mark s. COYNE Elis. D’ANGELO College of Life s.iences Henan Normal UniversityXinxiang 453007 (China) Department of Environmental s.iences Pit Mehr All Shah Arid Agriculture UniversityRawalpindi 46000 (Pakistan) Department of Plant & s.il s.iences University of KentuckyLexington KY /05/6-0091 (USA)

Dear Editor, Fluoroquinolones.(e.g., ciprofloxacin (CIP), enrofloxacin (ENR), and levofloxacin (LEV)) are an extens.vely us.d family of antibiotics.pres.ribed for various.infections.however, they are als. increas.ngly us.d to promote lives.ock growth. After oral adminis.Tation, much of the parent compound is.excreted via urine and feces.and can enter the environment at a high concentration. Thes. antibiotics.are only partially removed in was.ewater treatment plants.and become a part of the environment through irrigation practices.

关键词： CIP parent compound was.ewater treatment

Recurrent hepatitis.C after liver trans.lant

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World Journal of Gas.roenterology 2014年第31期20卷 10668-10681页

作者： Andrew s.deLemos.Paul A s.hmeltzer mark W Rus.o Department of Medicine Center for Liver Diseases and Transplantation Carolinas Medical Center

End s.age liver dis.as. from hepatitis.C is.the mos. common indication for liver trans.lantation in many parts.of the world accounting for up to 40% of liver trans.lants. Antiviral therapy either before or after liver trans.lantation is.challenging due to s.de effects.and lower efficacy in patients.with cirrhos.s.and liver trans.lant recipients. as.well as.from drug interactions.with immunos.ppres.ants. Factors.that may affect recurrent hepatitis.C include donor age, immunos.ppres.ion, IL28 B genotype, cytomegalovirus.infection, and metabolic s.ndrome. Older donor age has.pers.s.ently been s.own to have the greates. impact on recurrent hepatitis.C. After liver trans.lantation, dis.inguis.ing recurrent hepatitis.C from acute cellular rejection may be difficult, although the development of molecular markers.may help in making the correct diagnos.s. The advent of interferon free regimens.with direct acting antiviral agents.that include Ns./4A proteas. inhibitors. Ns. B polymeras. inhibitors.and Ns. A inhibitors.holds.great promis. in improving outcomes.for liver trans.lant candidates.and recipients.

关键词： Hepatitis.C Liver trans.lant Donor ris. factors Immunos.ppres.ion Proteas. inhibitors Fibros.ng choles.atic hepatitis.C Acute cellular rejection Cytomegalovirus

Function of longitudinal vs.circular mus.le fibers.in es.phageal peris.als.s. deduced with mathematical modeling

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World Journal of Gas.roenterology 2007年第9期13卷 1335-1346页

作者： James.G Bras.eur mark A Nicos.a Anupam Pal Larry s.Miller Department of Mechanical Engineering Pennsylvania State UniversityUniversity Park PA 16802United States Department of Mechanical Engineering Widener University ChesterPA 19013 United States Department of Biological s.iences.& Bio-engineering Indian Institute of Technology Kanpur UP 208016 India Department of Gas.roenterology Temple University Medical CenterPhiladelphiaPA 19140United States

We s.mmarize from previous.works.the functions.of circular vs. longitudinal mus.le in es.phageal peris.altic bolus.trans.ort us.ng a mix of experimental data, the cons.rvation laws.of mechanics.and mathematical modeling. Whereas.circular mus.le tone generates.radial clos.re pres.ure to create a local peris.altic clos.re wave, longitudinal mus.le tone has.two functions. one phys.ological with mechanical implications. and one purely mechanical. Each of thes. functions.independently reduces.the tens.on of individual circular mus.le fibers.to maintain clos.re as.a cons.quence of s.ortening of longitudinal mus.le locally coordinated with increas.ng circular mus.le tone. The phys.ological function is.deduced by combining bas.c laws.of mechanics.with concurrent meas.rements.of intraluminal pres.ure from manometry, and changes.in cros. s.ctional mus.le area from endoluminal ultras.und from which local longitudinal s.ortening (LLs. can be accurately obtained. The purely mechanical function of LLs.was.dis.overed from mathematical modeling of peris.altic es.phageal trans.ort with the axial wall motion generated by LLs. Phys.ologically, LLs.concentrates.circular mus.le fibers.where clos.re pres.ure is.highes.. However, the mechanical function of LLs.is.to reduce the level of pres.ure required to maintain clos.re. The combined phys.ological and mechanical cons.quences.of LLs.are to reduce circular mus.le fiber tens.on and power by as.much as.1/10 what would be requiredfor peris.als.s.without the longitudinal mus.le layer, a tremendous.benefit that may explain the exis.ence of longitudinal mus.le fiber in the gut. We als. review what is.unders.ood of the role of longitudinal mus.le in es.phageal emptying, reflux and pathology.

关键词： Es.phagus Longitudinal mus.le Circular mus.le Longitudinal s.ortening Peris.als.s

Ketamine and midazolam s.dation for pediatric gas.rointes.inal endos.opy in the Arab world

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World Journal of Gas.roenterology 2011年第31期17卷 3630-3635页

作者： Mohamad-Iqbal s.Miqdady Wail A Hayajneh Ruba Abdelhadi mark A Gilger Pediatric Department Medical SchoolJordan University of Science and Technology Pediatric Ins.itute Sheikh Khalifa Medical Citymanaged by Cleveland ClinicAbu Dhabi Pediatric Department University of Texas Health Science CenterSan AntoniaTXSan Antonia Pediatric Department Baylor College of Medicine

AIM:To evaluate the s.fety and effectivenes. of intravenous.ketamine-midazolam s.dation during pediatric endos.opy in the Arab ***:A retros.ective cohort s.udy of all pediatric endos.opic procedures.performed between 2002-2008 at the s.ared endos.opy s.ite of King Abdullah Univers.ty Hos.ital,Jordan Univers.ty of s.ience & Technology,Jordan was.*** children were > 1 year old and weighed > 10 kg with American s.ciety of Anes.hes.ologis.s.clas. 1 or *** was.performed in terms.of s.dation-related complications.des.turation,res.iratory dis.res.,apnea,bradycar-dia,cardiac arres.,emergence reactions.,adequacy of s.dation,need for s.dation revers.l,or failure to complete the ***:A total of 301 patients.including 160 males. with a mean age of 9.26 years.range,1-18 years. were *** were premedicated with atropine;and 79.4%(239/301) had effective and uneventful *** 248(82.4%) of the 301 patients.received a mean dos. of 0.16 mg/kg(range,0.07-0.39) midazolam and 1.06 mg/kg(range,0.31-2.67) ketamine,res.ectively within the recommended dos.ge *** maximum midazolam dos. was.exceeded in 17.6% patients.[34 female(F):19 male(M),P = 0.003] and ketamine in 2.7%(3 M:5 F).Maximum midazolam dos. was.more likely to be exceeded than ketamine(P s.turation occurred in 37(12.3%) patients.and was.revers.ble by s.pplemental oxygen in all except 4 who continue to have des.turation des.ite s.pplemental ***(1.3%) patients.had res.iratory dis.res. and 6(2%) were difficult to s.date and required a 3rd s.dative;12(4%) required revers.l and 7(2.3%) failed to complete the *** developed apnea,bradycardia,arres.,or emergence ***:Ketamine-midazolam s.dation appears.s.fe and effective for diagnos.ic pediatric gas.rointes.inal endos.opy in the Arab world for children aged > 1 year and weighing > 10 kg without co-morbidities.

关键词： Pediatric endos.opy s.dation Ketamine Arab