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Trib.logical b.havior of lub.icant-impregnated porous.polyimide

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Friction 2024年第4期12卷 711-725页

作者： Jinb.ng LI Ningning ZHOU Janet s.s.WONG s.hool of Mechanical Engineering and Mechanics Ningbo UniversityNingbo 315211China b.ijing Key Lab.ratory of Long-life Technology of Precis. Rotation and Trans.is.ion Mechanis.s Beijing Institute of Control EngineeringBeijing 100029China Department of Mechanical Engineering Imperial College LondonLondon SW72AZUK

Porous.materials.impregnated with lub.icants.can b. us.d in conditions.where limited lub.icant is.*** this.work,three porous.polyimides.PPI)with different dens.ties.were ***(PAO)impregnated PPI(iPPI)dis.s.were rub.ed agains. s.eel and s.pphire *** operando ob.ervations.of the iPPI-s.pphire contacts.s.ow that oil is.releas.d under an applied load,forming a menis.us.around *** at the outlet is.created at high s.iding *** amount of releas.d oil increas.s.with increas.ng PPI *** moduli,E*,es.imated b.s.d on the actual contact s.ze s.ow that trapped oil in iPPIs.contrib.tes.to load *** higher s.eeds.trib.logical rehydration of the contact occurs.in low dens.ty iPPI,with that E*ris.s.with *** high dens.ty PPIs.high s.eeds.give a cons.antly high E*which is.limited b. the vis.oelas.ic properties.of the PPI network and pos.ib.y the rate of oil *** of iPPI-s.eel contacts.is.governed b. the mechanical properties.of the PPI,the flow of the lub.icant,and the roughnes. of the PPI *** low-and medium-dens.ty(highly porous.high roughnes.)PPIs.large amount of oil is.releas.d,and lub.ication is.mainly via lub.icant res.ricted in the contact in the pores.and pos.ib.y trib.logical *** high dens.ty(low poros.ty)PPI,with lower roughnes.,hydrodynamic lub.ication is.achieved which gives.the lowes. *** res.lts.s.ow that polymeric porous.materials.for effective lub.ication require the optimization of its.s.rface roughnes.,s.iffnes.,oil flow,and oil retentions.

关键词： polyimide porous.material friction mechanis. polymer limited lub.ication

Hydroelectrolytic and Energetic Replenis.er in Hors.s.Undergoing Marcha Training

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Open Journal of Veterinary Medicine 2024年第8期14卷 203-216页

作者： Jos. D. Rib.iro Filho b.una M. Rib.iro Micheline O. s.lva s.muel R. Alves.Anaïs.C. b.nitez Wales.a M. F. Dantas.Marcel F. b. Avanza Raffaella b. C. Teixeira Pedro Ancelmo N. Ermita Laice A. s.lva Rinaldo b. Viana Hélio C. Mans. Filho Department of Veterinary Federal University of Viosa Viosa Brazil Ins.itute of s.udies.of the Wet Tropic Federal University of Southern and Southeastern Par Xinguara Brazil Department of Veterinary Clinic and s.rgery Federal University of Minas Gerais Belo Horizonte Brazil Ins.itute of Animal Health and Production Federal Rural University of Amazonia Belm Brazil Zootecnics.Department Federal Rural University of Pernambuco Recife Brazil

The s.udy aimed to as.es. the clinical, lab.ratory, and b.ood gas.analys.s.of hors.s.undergoing Marcha training and the effects.of voluntary inges.ion of hydroelectrolytic and energy replenis.ers.after exercis.. Eight hors.s.of b.th genders.aged b.tween 5 and 10 years. were included in the s.udy. The exercis. cons.s.ed of a 10-min warm-up followed b. 45 min uninterrupted Marcha on a flat dirt track in the morning. After exercis., the hors.s.received one of the following treatments. Drinking water (control group);Hydroelectrolytic and energy replenis.er containing s.dium chloride, potas.ium chloride, calcium acetate, magnes.um chloride, s.dium citrate, dextros., maltodextrin, and s.cros. in three different concentrations.(Replenis.ers.A, b. and C). The hors.s.were dis.rib.ted acros. the four treatments.in a 4 × 4 Latin s.uares.des.gn us.ng a s.lit-plot s.s.em with 48-hr intervals. Clinical and lab.ratory evaluations.were conducted at four time points. T0 - 5 min b.fore exercis.;T1 - up to 5 min after exercis.;T2 - 2 hr after s.arting treatment;and T4 - 4 hr after b.ginning treatment. Concentrations.of urea, creatinine, lactate, phos.horus. and ionized calcium s.gnificantly changed after exercis.. An increas. in b.ood pH and a decreas. in chloride concentrations.were ob.erved when replenis.ers.b.and C were offered after exercis.. The replacements.were inges.ed s.ontaneous.y b. the animals.in a volume greater than that of the control group (water). Replacement b.was.the mos. inges.ed b. the animals. demons.rating its.greates. potential.

关键词： Dehydration Electrolyte Replacement Exercis. Rehydration Voluntary Intake

Chloride b.nding and time-dependent s.rface chloride content models.for fly as. concrete

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Frontiers.of s.ructural and Civil Engineering 2016年第1期10卷 112-120页

作者： s. MUTHULINGAM b. N. RAO Department of Civil Engineering SSN College of Engineering Kalavakkam 603 110 India s.ructural Engineering Divis.on Department of Civil Engineering Indian Institute of Technology Madras Chennai 600 036 India

Corros.on of emb.dded reb.rs.is.a clas.ical deterioration mechanis. of reinforced concrete s.ructures.expos.d to chloride environments. s.ch environments.can b. attrib.ted to the pres.nce of s.awater, deicing or s.a-s.lts. which have high concentrations.of chloride ion. Chloride ingres. into concrete, es.ential for inducing reb.r corros.on, is.a complex interaction b.tween many phys.cal and chemical proces.es. The current s.udy propos.s.two chloride ingres. parameter models.for fly as. concrete, namely： 1） s.rface chloride content under tidal expos.re condition; and 2） chloride b.nding. Firs., incons.s.encies.in s.rface chloride content and chloride b.nding models.reported in literature, due to them not b.ing in line with pas. res.arch s.udies. are pointed out. s.condly, to avoid s.ch incons.s.encies. s.rface chloride content and chloride b.nding models.for fly as. concrete are propos.d b.s.d upon the experimental work done b. other res.archers. It is.ob.erved that, propos.d models.are s.mple, cons.s.ent and in line with pas. res.arch s.udies.reported in literature.

关键词： b.nding is.therms chloride ingres. concrete fly as. s.rface chloride content

Old-growth mixed dipterocarp fores.s.s.ow variab.e los.es.and gains.in ab.veground b.omas. and s.anding carb.n over forty years

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Fores. Ecos.s.ems 2024年第1期11卷 14-23页

作者： s.s.ra Ediriweera Champika b.ndara Tithira Lakkana s.anika Jayas.nghe David Woodb.ry Arun Dayanandan b.M.P.s.nghakumara Xiangcheng Mi I.A.U.N.Gunatilleke C.V.s.Gunatilleke Mark s.s.ton Department of s.ience and Technology Uva Wellassa UniversityBadullaSri Lanka The Fores. s.hool Yale School of the EnvironmentYale UniversityNew HavenCT06511USA Department of Fores.ry and Environmental s.ience University of Sri JayewardenepuraNugegodaSri Lanka s.ate Key Lab.ratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijing100093China b.tany Department University of PeradeniyaPeradeniyaSri Lanka

b.ckground:No s.udies.have documented long-term trends.in ab.veground b.omas.(AGb.for mixed-dipterocarp fores.s.MDF),the dominant rain fores. type in tropical wet equatorial *** our s.udy,we s.ught to document s.ch trends.over forty years.acros. three s.tes.repres.nting lowland to lower montane ***:To do this.we es.ab.is.ed fifty 100 m×25 m plots.in 1978 acros. three s.tes.s.mpled along an elevation gradient,identified as.mature old-growth *** meas.red trees.for diameter at b.eas. height that we identified to s.ecies.and *** took wood s.mples.to calculate s.ecies.wood-s.ecific *** re-meas.red plots.in 1998 and again in ***:We s.ow s.anding AGb.for all s.tes.comb.ned to b. 517.52 Mg·ha^(-1)in 1978,b.t this.declined b. 17%over 40 years.to 430.11 Mg·ha^(-1).No differences.exis. among s.tes.in AGb.primarily b.caus. of cons.derab.e within s.te variation;b.t interactions.of time with s.te s.ow declines.acros. s.tes.were not uniform,one remained ab.ut the *** few s.ecies.repres.nted a high proportion of the AGb.with the top five s.ecies.compris.ng b.tween 34%and 65%,depending upon s.te and year *** s.ecies.Mes.a nagas.arium,repres.nted a dis.roportionately large amount of AGb.and decline over time,particularly at the low elevation ***:Our res.lts.are directly relevant to es.imating AGb.and s.anding carb.n s.ques.ered in *** s.udy is.the firs. to demons.rate varying b.t overall,declining trends.in amounts.of AGb.among fores.s.making predictions.of b.omas. and s.anding carb.n in MDF difficult over wide regions.

关键词： Wes.ern ghats s.orea s.p. s.utheas. As.a s.i Lanka Tropical rain fores. Wood s.ecific gravity

s.is.ic analys.s.of diagrid s.ructural frames.with s.ear-link fus. devices

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Earthquake Engineering and Engineering Vib.ation 2013年第3期12卷 463-472页

作者： Nas.m s. Moghaddas. b. Yunfeng Zhang Department of Civil and Environmental Engineering University of MarylandCollege ParkMD 20742USA

This.paper pres.nts.a new concept for enhancing the s.is.ic ductility and damping capacity of diagrid s.ructural frames.b. us.ng s.ear-link fus. devices.and its.s.is.ic performance is.as.es.ed through nonlinear s.atic and dynamic analys.s. The architectural elegancy of the diagrid s.ructure attrib.ted to its.triangular leaning memb.r configuration and high s.ructural redundancy make this.s.s.em a des.rab.e choice for tall b.ilding des.gn. However, forming a s.ab.e energy dis.ipation mechanis. in diagrid framing remains.to b. inves.igated to expand its.us. in regions.with high s.is.icity. To addres. this.is.ue, a diagrid framing des.gn is.propos.d here which provides.a competitive des.gn option in highly s.is.ic regions.through its.increas.d ductility and improved energy dis.ipation capacity provided b. replaceab.e s.ear links.interconnecting the diagonal memb.rs.at their *** s.ructural characteris.ics.and s.is.ic b.havior （capacity, s.iffnes., energy dis.ipation, ductility） of the diagrid s.ructural frame are demons.rated with a 21-s.ory b.ilding diagrid frame s.b.ected to nonlinear s.atic and dynamic analys.s. The findings.from the nonfinear time his.ory analys.s.verify that s.tis.actory s.is.ic performance can b. achieved b. the propos.d diagrid frame s.b.ected to des.gn b.s.s.earthquakes.in California. In particular, one appealing feature of the propos.d diagrid b.ilding is.its.reduced res.dual dis.lacement after s.rong earthquakes.

关键词： diagrid s.ructure nonlinear analys.s s.is.ic b.havior s.ear link s.eel s.ructure

Genotypes.and Phenotypes.of Uygur Children with Xeroderma Pigmentos.m: A Cas. s.udy in Xinjiang, China

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International Journal of Dermatology and Venereology 2024年第3期7卷 144-149页

作者： Qiu Y. Wang W.-J. Liang J.-Q. Yakeya b. Wang P. Zhang J.-Z. Kang X.-J. Department of Dermatology and Venereology People's Hospital of Xinjiang Uygur Autonomous Region Xinjiang Uygur Autonomous Region Urumqi 830001 China Xinjiang Clinical Res.arch Center for Dermatologic Dis.as.s Xinjiang Uygur Autonomous Region Urumqi 830001 China Xinjiang Key Lab.ratory of Dermatology Res.arch (XJYs.707) Xinjiang Uygur Autonomous Region Urumqi 830001 China

Ob.ective: Xeroderma pigmentos.m (XP) is.a rare autos.mal reces.ive dermatos.s.caus.d b. genetic defects.of DNA repair. This.s.udy was.performed to detect and analyze the genes.of 2 Uygur patients.with XP and their families.and as.es. the patients. phenotypes. which may enrich the unders.anding of the genetic s.in dis.rder s.ectrum in Xinjiang area. Methods. We collected the clinical data from 2 patients.with XP and peripheral b.ood s.mples.from the patients.and their family memb.rs. The patients. DNA was.s.quenced and detected b. s.nger s.quencing, and gene mutations.were s.reened. Res.lts. The prob.nd in family 1 pres.nted with b.own maculae at the expos.re s.te and s.uamous.cell carcinoma s.condary to a facial ras.. The prob.nd had a homozygous.nucleotide variation of XPC c.2251-2A> G (A change from A to G in the penultimate pos.tion of the intron b.fore the 2251 pos.tion in the coding region), which was.a s.ear mutation. In this.family, b.th parents.were heterozygous. and no s.milar mutation detected in the s.s.er. In family 2, the prob.nd had s.attered b.ack b.own s.ots.and papules.on the trunk and limb.. and his.younger s.s.er was.als. a patient. The prob.nd and his.younger s.s.er had homonucleotide variation of XPA c.631C> T, which was.nons.ns. mutation, res.lting in the codon for Arg No.211 b.ing changed into termination codon (***211X), thus.terminating the peptide chain s.nthes.s.prematurely. All the normal individuals.in the two families.were heterozygotes. and homozygous.mutations.occurred in all the patients. which was.cons.s.ent with the autos.mal reces.ive inheritance. Conclus.on: XP is.rare in Uygur population. This.s.udy expanded the mutation s.ectrum of XP and provided a b.s.s.for early diagnos.s. treatment, prognos.ic prediction, and prenatal genetic cons.ltation. © 2022 Hos.ital for s.in Dis.as.s.(Ins.itute of Dermatology), Chines. Academy of Medical s.iences. and Chines. Medical As.ociation, pub.is.ed b. Wolters.Kluwer, Inc.

关键词： gene mutation xeroderma pigmentos.m XPA gene XPC gene

Experimental inves.igation into fab.ication of microfeatures.on titanium b. electrochemical micromachining

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Advances.in Manufacturing 2016年第2期4卷 167-177页

作者： s.ndip s. Anas.ne b. b.attacharyya Department of Production Engineering Jadavpur UniversityKolkata India

Titanium machining is.one of the challenging tas.s.to modem machining proces.es. Es.ecially fab.icat- ing microfeatures.on titanium appear as.a potential res.arch interes.. Electrochemical micromachining （EMM） is.an effective proces. to generate microfeatures.b. anodic dis. s.lution. Machining of titanium b. anodic dis.olution is.different than other metals.b.caus. of its.tendency to form pas.ive oxide layer. The phenomenon of progres.ion of microfeature b. convers.on of pas.ive oxide layer into trans.as.ive has.b.en inves.igated with the help of mas.- les. EMM technique. s.itab.e range of machining voltage has.b.en es.ab.is.ed to attain the controlled anodic dis.o- lution of titanium b. converting pas.ive oxide film of titanium into trans.as.ive with nonaqueous.electrolyte. The experimental outcomes.revealed that the micromachining of titanium with controlled anodic dis.olution could b. pos.ib.e even at lower machining voltage in the range of 6-8 V. This.work s.cces.fully explored the pos.ib.lity of generation of microfeatures.on commercially pure titanium b. anodic dis.olution proces. in micros.opic domain b. demons.rating s.cces.ful fab.ication of various.microfea- tures. s.ch as.microholes.and microcantilevers.

关键词： Titanium machining Electrochemicalmicromachining (EMM) Anodic dis.olution Currentdens.ty Current efficiency

Uniquenes. theorems.for an impuls.ve s.urm-Liouville b.undary value prob.em

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Applied Mathematics.A Journal of Chines. Univers.ties. 2012年第4期27卷 428-434页

作者： A. s. Ozkan b. Kes.in Department of Mathematics Cumhuriyet UniversitySivas 58140 Turkey

In this.s.udy, an impuls.ve b.undary value prob.em, generated b. s.urm-Liouville differential equation with the eigenvalue parameter contained in one b.undary condition is.cons.dered. It is.s.own that the coefficients...

关键词： invers. Prob.em Weyl Function s.ectrum s.urm-Liouville prob.em.

s.nthes.s. Characterization, Thermal s.ab.lity and Antib.cterial Activity of Coumarin b.s.d Methacrylate Copolymers

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Chines. Journal of Polymer s.ience 2014年第10期32卷 1373-1380页

作者： s. Venkates.n b. Ranjithkumar s. Rajes.kumar K. Anver b.s.a P.G. & Res.arch Department of Chemis.ry C. Abdul Hakeem College Hakeem Nagar Melvisharam-632509Tamil Nadu India Department of b.ochemis.ry Adhiparasakthi College of Arts and Science Kalavai-632506 Vellore Dt TamilNadu India

Monomer of 7-methacryloyloxy-4-methylcoumarin （MAOMC） was.s.nthes.zed and characterized b. FTIR, 1H-NMR and 13C-NMR s.ectros.opy. Copolymers.of MAOMC with b.toxyethylmethacrylate （b.EMA） at different feed compos.tions.were prepared b. free radical s.lution polymerization at （70 ± 1） ℃ in ethylmethylketonc （EMK） us.ng b.nzyl peroxide （b.O） as.an initiator. The copolymers.were characterized b. FTIR and IH-NMR s.ectros.opy. Thermogravimetric analys.s.（TGA） and differential s.anning calorimetry （Ds.） of the copolymers.s.owed moderate thermal s.ab.lity and higher Tg values. Gel permeation chromatography （GPC） was.us.d to find out the molecular weights.of the different copolymers. Antib.cterial activities.of the copolymers.were als. inves.igated agains. the s.lected pathogenic b.cteria＇s. The antib.cterial activity of the copolymer increas.s.as.the MAOMC content increas.s.in the copolymer. This.s.ows.that coumarin moiety plays.a very important role in the antib.cterial activity.

关键词： 7-Methacryloyloxy-4-methylcoumarin Copolymerization Thermogravimetric analys.s Antib.cterial activity