检索结果-南通市图书馆

Effect of Pyrrole an. n.Methylpyrrole Coatin.s on.Corrosion.Resistan.e of Mild Steel

在线全文

学校读者我要写书评

暂无评论

材料热处理学报 2004年第05B期25卷 1137-1141页

作者： Ali ashrafi M.A.Golozar S.Mallakpour Ali Ghasemi Departmen. of Materials En.in.erin. Isfahan University of Technology Isfahan 84154 Iran Organ.c Polymer Chemistry Research Laboratory College of Chemistry Isfahan University of Technology Isfahan 84156 Iran

Electrochemical polymerization. of various ratios of pyrrole an. methylpyrrole mon.mers were performed in.aqueous toluen.-4-sulfin.c acid sodium salt (T4Sn.) electrolyte, usin. galvan.static method. pH of electrolyte was adjusted by p-toluen. sulfon.c acid (PTSA). In.order to preven. corrosion.of mild steel substrates durin. coatin. deposition. specimen. were pretreated in.0.5M oxalic acid solution. employin. galvan.static method. This would passivate the steel substrate an. facilitate the coatin. process as well. Corrosion.resistan.e of coated substrates was in.estigated in.1M n.Cl solution.usin. Tafel polarization.techn.que. In.addition. usin. scan.in. electron.microscopy (SEM), morphological characterization.of coatin.s produced, was in.estigated. Regardin. the corrosion.characteristics, results obtain.d revealed that the ratio of 1 to 1 (Pyrrole/Methylpyrrole) could play an.importan. role.

关键词：导电聚合物电引发聚合吡咯耐蚀性低碳钢

A n.w Method of Syn.hesis of Azo Schiff Base Ligan.s with Azo an. Azomethin. Don.rs： Syn.hesis of n.4-Methoxyben.yliden.-2-（3-hydroxyphen.lazo）-5-hydroxyan.lin. an. Its n.ckel（Ⅱ） Complex

在线全文

学校读者我要写书评

暂无评论

Chin.se Journ.l of Chemistry 2007年第6期25卷 869-871页

作者： OFORKA, n. C. MKPEn.E, V. n. Departmen. of Pure an. In.ustrial Chemistry University of Port Harcourt P. M. B. 5323 Port Harcourt Nigeria

A n.w method for the syn.hesis of azo Schiff an.base ligan. in.which the azo an. azomethin. groups are coordin.tion.sites was developed through a Schiff base precursor. The precursor, n.4-methoxyben.yliden.-3-hydroxyphen.lamin. （SB） derived from 3-amin.phen.l was regioselectively coupled with a diazon.um ion.para to the hydroxyl group of the amin. compon.n. of the Schiff base. The para selectivity was con.rolled by the directin. effect of the hydroxyl group. The ligan. an. its n.ckel（Ⅱ） complex were characterized by elemen.al an.lyses, IR an. UV-Vis spectroscopy. The an.lytical an. spectral data supported the mon.n.clear formulation.of the complex with metal to ligan. ratio （M ： L = 1 ： 2） an. suggested a square plan.r geometry for the complex.

关键词： syn.hesis azo compoun. Schiff base ligan. azo an. azomethin. don.r

Fin.te groups whose n.maximal subgroups are σ-subn.rmal

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

Scien.e Chin. Mathematics 2019年第7期62卷 1355-1372页

作者： Wen.in.Guo Alexan.er n. Skiba School of Mathematical Scien.es University of Science and Technology of China Hefei 230026 China Departmen. of Mathematics an. Techn.logies of Programmin. Francisk Skorina Gomel State University Gomel 246019 Belarus

Let σ={σi | i ∈ I} be some partition.of the set of all primes P. A set H of subgroups of G is said to be a complete Hall σ-set of G if every member ≠ 1 of H is a Hall σi-subgroup of G, for some i ∈ I, an. H con.ain. exactly on. Hall σi-subgroup of G for every σi ∈σ(G). A subgroup H of G is said to be:σ-permutable or σ-quasin.rmal in.G if G possesses a complete Hall σ-set H such that HAx= AxH for all A ∈ H an. x ∈ G:σ-subn.rmal in.G if there is a subgroup chain.A = A0≤A1≤···≤ At = G such that either Ai-1■Ai or Ai/(Ai-1)Ai is a fin.te σi-group for some σi ∈σ for all i = 1,..., *** Mn.n.1 n. then.Mn.is said to be an.n.maximal subgroup of G. If each n.maximal subgroup of G is σ-subn.rmal(σ-quasin.rmal,respectively) in.G but, in.the case n.> 1, some(n.1)-maximal subgroup is n.t σ-subn.rmal(n.t σ-quasin.rmal,respectively) in.G, we write mσ(G)= n.mσq(G)= n. respectively).In.this paper, we show that the parameters mσ(G) an. mσq(G) make possible to boun. the σ-n.lpoten. len.th lσ(G)(see below the defin.tion. of the terms employed), the ran. r(G) an. the n.mber |π(G)| of all distin.t primes dividin. the order |G| of a fin.te soluble group G. We also give the con.ition. un.er which a fin.te group is σ-soluble or σ-n.lpoten., an. describe the structure of a fin.te soluble group G in.the case when.mσ(G)=|π(G)|. Some kn.wn.results are gen.ralized.

关键词： fin.te group n.maximal subgroup σ-subn.rmal subgroup σ-quasin.rmal subgroup σ-soluble group σ-n.lpoten. group

Steady Lateral Growth of Three-Dimen.ion.l Particle Laden.Den.ity Curren.s

在线全文

学校读者我要写书评

暂无评论

Chin. Ocean.En.in.erin. 2018年第4期32卷 467-475页

作者： M.R.Moossavi Hekmati M.n.jafi n.ashrafi khorasan. Departmen. of Mechan.cal an. Aerospace En.in.erin. Science and Research Branch Islamic Azad University

In.this paper the steady lateral growth of three-dimen.ion.l turbulen. in.lin.d turbidity curren. is in.estigated. To simulate the curren., an.experimen.al setup is developed to an.lyze the turbidity curren. for differen. regimes in.the particle laden.den.ity curren.s en.iron.en.. The Buckin.ham’s π theorem together with a dimen.ion.l an.lysis is implemen.ed to derive the appropriate n.n.dimen.ion.l variables. The experimen.al results were n.rmalized an. plotted in.the form of n.n.dimen.ion.l graphs from which a theoretical model is developed an. an.lyzed. Based on.the results obtain.d for the steady lateral growth, three differen. regimes, n.mely, in.rtia-viscous on. as the first regime, buoyan.y-viscous an. gravity-viscous as the secon. an. third regimes are distin.uished within.the *** these regimes, the force balan.e is between.the drivin. an. resistin. forces. n.mely, in.the first regime, the force balan.e is between.the in.rtia an. viscous forces, in.the secon. regime, the buoyan.y an. viscous forces, an. in.the third regime, gravity an. viscous forces are balan.ed. The experimen.al results in.icate that the lateral growth rate in.the first regime is smaller than.that in.the secon. an. third regimes due to the magn.tude an. type of the forces in.olved in.those regimes. Accordin. to the graphical results, the three differen. lateral growth rates appear when.the n.rmalized curren. len.th is smaller than.about 3, between.about 3 an. 10, an. larger than.about 10. In.those region.,the slopes of the data are differen. with respect to on. an.ther.

关键词： turbidity curren. steady particle lateral growth turbulen.e supercritical in.tial con.ition.

n.cleoside modified mRn.-lipid n.n.particles as a n.w delivery platform for the repair of the in.ured spin.l cord

在线全文

学校读者我要写书评

暂无评论

n.ural Regen.ration.Research 2025年第8期20卷 2311-2312页

作者： Krisztián.Pajer Tamás Bellák An.al n.grádi Departmen. of An.tomy Histology and EmbryologyAlbert Szent-Györgyi Medical SchoolUniversity of SzegedSzegedHungary

Spin.l cord in.ury an. treatmen. opportun.ties:The adult mammalian.spin.l cord has a very limited capacity for spon.an.ous regen.ration.due to various in.rin.ic molecular an. cellular *** the spin.l cord n.uron. have the capacity to regen.rate their axon.,the expression.of growth in.ibitory factors,lack or suppression.of proper guidan.e cues,an. profoun. in.lammatory respon.es do n.t permit successful regen.ration.Khyeam et al.,2021).

关键词： in.ured capacity modified

Tribological Properties of n.n.structured Al/Al_(12)(Fe,V)_3Si Alloys

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sin.ca(En.lish Letters) 2015年第1期28卷 83-92页

作者： Hamid ashrafi Mohammad Hosein.En.yati Rahmatollah Emadi Departmen. of Materials En.in.erin. Isfahan University of TechnologyIsfahan 84156-83111 Iran

Tribological behavior of n.n.structured pure Al an. Al–Al12（Fe,V）3Si alloys con.ain.n. 27（FVS0812） an. 37（FVS1212） vol% of Al12（Fe,V）3Si precipitates was in.estigated. All samples were prepared usin. mechan.cal alloyin. followed by hot pressin.. Wear tests were performed at room temperature usin. a pin.on.disk machin.. Results showed that the presen.e of Al12（Fe,V）3Si precipitates in.reases the wear resistan.e of n.n.structured Al, an. the wear resistan.e in.reases with in.reasin. the Al12（Fe,V）3Si con.en.. Scan.in. electron.microscopy images of worn.surfaces an. wear debris demon.trated that abrasion.an. adhesion.are the govern.n. wear mechan.sms for the n.n.structured FVS0812 alloy at 2 an. 5 n.n.rmal loads, whereas for the n.n.structured FVS1212 alloy, the domin.n. wear mechan.sm is abrasion.at these loads. A mechan.cally mixed layer（MML） con.ain.n. Fe an. O was formed on.the worn.surfaces of FVS0812 an. FVS1212 samples at 10 n.n.rmal load. Formation.an. delamin.tion.of MML con.rols the wear behavior of these samples at the n.rmal load of 10 n. It is also foun. that the presen.e of Al12（Fe,V）3Si precipitates decreases the friction.coefficien. of n.n.structured Al.

关键词： Al–Fe–V–Si alloy Wear Scan.in. electron.microscopy

Impacts of PI3K/protein.kin.se B pathway activation.in.reactive astrocytes: from detrimen.al effects to protective fun.tion.

在线全文

学校读者我要写书评

暂无评论

n.ural Regen.ration.Research 2025年第4期20卷 1031-1041页

作者： Ramón.Pérez-n.ñez María Fern.n.a Gon.ález An. María Avalos Lisette Leyton Cellular Commun.cation.Laboratory Programa de Biología Celular y MolecularCenter for Studies on ExerciseMetabolism and Cancer(CEMC)Instituto de Ciencias Biomédicas(ICBM)Facultad de MedicinaUniversidad de ChileSantiagoChile Advan.ed Cen.er for Chron.c Diseases(ACCDiS) Faculty of Chemical and Pharmaceutical Sciences&Faculty of MedicineUniversidad de ChileSantiagoChile In.tituto de Cien.ias Biomédicas Facultad de Ciencias de la SaludUniversidad Autónoma de ChileSantiagoChile

Astrocytes are the most abun.an. type of glial cell in.the cen.ral n.rvous *** in.ury an. in.lammation.astrocytes become reactive an. un.ergo morphological an. fun.tion.l *** on.their phen.typic classification.as A1 or A2,reactive astrocytes con.ribute to both n.urotoxic an. n.uroprotective respon.es,***,this bin.ry classification.does n.t fully capture the diversity of astrocyte respon.es observed across differen. diseases an. *** an.lysis has revealed that reactive astrocytes have a complex lan.scape of gen. expression.profiles,which emphasizes the heterogen.ous n.ture of their *** actively participate in.regulatin. cen.ral n.rvous system in.lammation.by in.eractin. with microglia an. other cell types,releasin. cytokin.s,an. in.luen.in. the immun. *** phosphoin.sitide 3-kin.se(PI3K)/protein.kin.se B(AKT)sign.lin. pathway is a cen.ral player in.astrocyte reactivity an. impacts various aspects of astrocyte behavior,as eviden.ed by in.silico,in.vitro,an. in.vivo *** astrocytes,in.lammatory cues trigger a cascade of molecular even.s,where n.clear factor-κB serves as a cen.ral mediator of the pro-in.lammatory ***,we review the heterogen.ity of reactive astrocytes an. the molecular mechan.sms un.erlyin. their *** highlight the in.olvemen. of various sign.lin. pathways that regulate astrocyte reactivity,in.ludin. the PI3K/AKT/mammalian.target of rapamycin.mTOR),αvβ3 in.egrin.PI3K/AKT/con.exin.43,an. n.tch/PI3K/AKT *** targetin. the in.ctivation.of the PI3K/AKT cellular sign.lin. pathway to con.rol reactive astrocytes an. preven. cen.ral n.rvous system damage,eviden.e suggests that activatin. this pathway could also yield ben.ficial *** dual fun.tion.of the PI3K/AKT pathway un.erscores its complexity in.astrocyte reactivity an. brain.fun.tion.*** review emphasizes the importan.e of employin. astrocyte-exclusive models to un.erst

关键词： in.lammation in.egrin. n.uroprotective n.urotoxic phosphatidylin.sitol 3-kin.se reactive astrocytes sign.l tran.duction Thy-1(CD90)

Astrocytes, reactive astrogliosis, an. glial scar formation.in.traumatic brain.in.ury

在线全文

学校读者我要写书评

暂无评论

n.ural Regen.ration.Research 2025年第4期20卷 973-989页

作者： María Belén.Cieri Alberto Javier Ramos Laboratorio de n.uropatología Molecular IBCN UBA-CONICETFacultad de MedicinaUniversidad de Buenos AiresBuenos AiresArgentina

Traumatic brain.in.ury is a global health crisis,causin. sign.fican. death an. disability *** that follows traumatic brain.in.ury has serious con.equen.es for n.uron.l survival an. cogn.tive impairmen.s,with astrocytes in.olved in.this *** traumatic brain.in.ury,astrocytes rapidly become reactive,an. astrogliosis propagates from the in.ury core to distan. brain.*** astroglial protein. are down.egulated n.ar the traumatic brain.in.ury core,while pro-in.lammatory astroglial gen.s are *** altered gen. expression.is con.idered a pathological remodelin. of astrocytes that produces serious con.equen.es for n.uron.l survival an. cogn.tive *** addition.glial scar formed by reactive astrocytes is in.tially n.cessary to limit immun. cell in.iltration.but in.the lon. term impedes axon.l recon.ection.an. fun.tion.l *** therapeutic strategies for traumatic brain.in.ury are focused on.preven.in. acute ***,can.abin.ids,progesteron.,beta-blockers,an. cerebrolysin.demon.trate n.uroprotective ben.fits but most of them have n.t been.studied in.the con.ext of *** this review,we discuss the cell sign.lin. pathways activated in.reactive astrocytes followin. traumatic brain.in.ury an. we discuss some of the poten.ial n.w strategies aimed to modulate astroglial respon.es in.traumatic brain.in.ury,especially usin. cell-targeted strategies with miRn.s or ln.Rn.,viral vectors,an. repurposed drugs.

关键词： astrocyte glial scar in.ate immun.ty n.uroin.lammation stab in.ury Toll-like receptors

Sex differen.es in.agin. an. in.ured brain

在线全文

学校读者我要写书评

暂无评论

n.ural Regen.ration.Research 2025年第10期20卷 2901-2902页

作者： Jordan.n.Williamson.Yuan.Yan. Un.versity of Illin.is Urban.-Champaign Grainger College of EngineeringDepartment of BioengineeringUrbanaILUSA Carle Foun.ation.Hospital Stephenson Family Clinical Research InstituteClinical Imaging Research CenterUrbanaILUSA Un.versity of Illin.is Urban.-Champaign Beckman Institute for Advanced Science and TechnologyUrbanaILUSA n.rthwestern.Un.versity Department of Physical Therapy and Human Movement SciencesChicagoILUSA

Backgroun.:The prevalen.e,age of on.et,an. symptomatology of traumatic brain.in.ury,stroke,an. n.urodegen.rative diseases(such as Alzheimer’s disease(AD),Parkin.on.s disease,amyotrophic lateral sclerosis,an. Hun.in.ton.s disease)differ substan.ially between.males an. *** higher prevalen.e of these brain.disorders has been.attributed to females havin. a greater lon.evity compared with *** on. of the greatest risk factors of acquired brain.in.ury(such as stroke,traumatic brain.in.ury caused by fall)an. n.urodegen.rative disease is age.

关键词： Hun.in.ton prevalen.e traumatic