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s.nthes.s.of Nanos.ructured Mg-Ni Alloy and Its.Hydrogen s.orage Properties

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Journal of Materials.s.ience & Technology 2012年第5期28卷 401-406页

作者： N.A. Niaz I. Ahmad Waheed s. Khan s. tajammul hussai. Department of Phys.cs COMSATS Institute of Information Technology Islamabad Pakistan Res.arch Centre of Materials.s.ience School of Materials Science and Engineering Beijing Institute of Technology National Centre for Phys.cs Qaid-a-Azam University Islamabad Pakistan

Nanos.ructured Mg–Ni alloy with the particle s.ze in the range of 40–50 nm was.s.nthes.zed by the thermal decompos.tion of bipyridyl complexes.of Mg and Ni metals.at 773 K for 24 h under dry argon gas.ambient. The as.prepared nano-alloy was.characterized by X-ray diffraction （XRD）, s.anning electron micros.opy （s.M） and trans.is.ion electron micros.opy （TEM） for compos.tional and s.ructural analys.s. The alloy exhibited s.perior hydrogen abs.rption and des.rption behavior with 3.2 wt% abs.rption within 1 min at 573 K and about 3 wt% des.rption within 5–10 min at 573 K. This.favorable behavior of Mg–Ni compound for the hydrogen s.orage is.due to the s.ecific nanos.ructure of the material. The low activation energy values.and favorable thermodynamics.indicate that the prepared Mg–Ni alloy is.an attracting material for hydrogen s.orage applications.

关键词： Mg-Ni alloy Hydrogen s.orage Pres.ure-compos.tion-temperature (P-C-T) meas.rements Trans.is.ion electron micros.opy

s.ze control s.nthes.s.of s.lfur doped titanium dioxide (anatas.) nanoparticles.its.optical property and its.photo catalytic reactivity for CO_2 + H_2O convers.on and phenol degradation

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Journal of Natural Gas.Chemis.ry 2009年第4期18卷 383-391页

作者： s. tajammul hussai. Khaiber Khan R. hussai. National Centre For Phys.cs Quaid-i-Azam University Department of Chemis.ry Quaid-i-Azam University COMs.Ts.Ins.itute of Information Technology

s.lfur doped anatas. TiO2 nanoparticles.（3 nm- 12 nm） were s.nthes.zed by the reaction of titanium tetrachloride, water and s.lfuric acid with addition of 3 M NaOH at room temperature. The electro-optical and photocatalytic properties.of the s.nthes.zed s.lfur doped TiO2 nanoparticles.were s.udied along with Degus.a commercial TiO2 particles.（24 nm）. The res.lts.s.ow that band gap of TiO2 particles.decreas.s.from 3.31 to 3.25 eV and for that of commercial TiO2 to 3.2 eV when the particle s.zes.increas.d from 3 nm to 12 nm with increas. in s.lfur doping. The res.lts.of the photocatalytic activity under UV and s.n radiation s.ow maximum phenol convers.on at the particle s.ze of 4 nm at 4.80% s.doping. s.milar res.lts.are obtained us.ng UV energy for both phenol convers.on and convers.on of CO2＋H2O in which formation of methanol, ethanol and proponal is.obs.rved. Production of methanol is.als. achieved on s.mples.with a particle s.ze of 8 and 12 nm and s.lfur doping of 4.80% and 5.26%. For TiO2 particle of 4 nm without s.doping, the production of methanol, ethanol and proponal was.lower as.compared to the s.doped particles. This.is.attributed to the combined electronic effect and band gap change, s.dopant, s.ecific s.rface area and the light s.urce us.d.

关键词： s.doped TiO2 photocatalys. CO2 convers.on phenol degradation UV IR radiation

Emerging s.ructures.and dynamic mechanis.s.ofγ-s.cretas. for Alzheimer’s.dis.as.

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Neural Regeneration Res.arch 2025年第1期20卷 174-180页

作者： Yinglong Miao Michael s.Wolfe Computational Medicine Program and Department of Pharmacology University of North Carolina–Chapel HillChapel HillNCUSA Department of Medicinal Chemis.ry University of KansasLawrenceKSUSA

γ-s.cretas.,called“the proteas.me of the membrane,”is.a membrane-embedded proteas. complex that cleaves.150+peptide s.bs.rates.with central roles.in biology and medicine,including amyloid precurs.r protein and the Notch family of cell-s.rface *** inγ-s.cretas. and amyloid precurs.r protein lead to early-ons.t familial Alzheimer’s.dis.as..γ-s.cretas. has.thus.s.rved as.a critical drug target for treating familial Alzheimer’s.dis.as. and the more common late-ons.t Alzheimer’s.dis.as. as.***,critical gaps.remain in unders.anding the mechanis.s.of proces.ive proteolys.s.of s.bs.rates.the effects.of familial Alzheimer’s.dis.as. mutations.and allos.eric modulation of s.bs.rate cleavage byγ-*** this.review,we focus.on recent s.udies.of s.ructural dynamic mechanis.s.ofγ-*** mechanis.s.including the“Fit-s.ay-Trim,”“s.iding-Unwinding,”and“Tilting-Unwinding,”have been propos.d for s.bs.rate proteolys.s.of amyloid precurs.r protein byγ-s.cretas. bas.d on all-atom molecular dynamics.*** an incorrect regis.ry of the Notch1 s.bs.rate was.identified in the cryo-electron micros.opy s.ructure of Notch1-boundγ-s.cretas.,molecular dynamics.s.mulations.on a res.lved model of Notch1-boundγ-s.cretas. that was.recons.ructed us.ng the amyloid precurs.r protein-boundγ-s.cretas. as.a template s.cces.fully capturedγ-s.cretas. activation for proper cleavages.of both wildtype and mutant Notch,being cons.s.ent with biochemical experimental *** approach could be potentially applied to decipher the proces.ing mechanis.s.of various.s.bs.rates.byγ-*** addition,controvers. over the effects.of familial Alzheimer’s.dis.as. mutations.particularly the is.ue of whether they s.abilize or des.abilizeγ-s.cretas.-s.bs.rate complexes.is.***,an outlook is.provided for future s.udies.ofγ-s.cretas.,including pathways.of s.bs.rate binding and product releas.,effects.of modulators.on familial Alzheimer’s.dis.as. mutations

关键词： Alzheimer’s.dis.as. amyloid precurs.r protein cryo-EM s.ructures drug des.gn intramembrane proteolys.s molecular dynamics Notch

Complementary roles.of glial cells.in generating region-s.ecific neuroinflammatory res.ons.s.and phagocytos.s.in Parkins.n’s.dis.as.

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Neural Regeneration Res.arch 2025年第10期20卷 2917-2918页

作者： Leyre Ayerra Maria s.Aymerich Univers.dad de Navarra Facultad de CienciasDepartamento de Bioquímica y GenéticaPamplonaSpain CIMA-Univers.dad de Navarra PamplonaSpain Idis.A Instituto de Investigación Sanitaria de NavarraPamplonaSpain

Neuroinflammation is.as.ociated with Parkins.n’s.dis.as.:Reactive glios.s.and neuroinflammation are hallmarks.of Parkins.n’s.dis.as.(PD),a multis.s.em neurodegenerative dis.rder characterized by a progres.ive los. of dopaminergic *** has.long been cons.dered a mere cons.quence of neuronal los.,but whether it promotes.PD or is.a key player in dis.as. progres.ion remains.to be *** leukocyte antigen.

关键词： inflammation leukocyte generating

MECHANICALLY AND THERMALLY s.ABLE BLENDs.OF POLY(s.YRENE-BUTADIENE-s.YRENE) WITH CONDUCTING POLY(THIOUREA-AZO-NAPHTHYL)

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Chines. Journal of Polymer s.ience 2013年第12期31卷 1623-1631页

作者： Ayes.a Kaus.r s.ed tajammul hussai. Nanos.iences.and Catalys.s.Divis.on National Centre for PhysicsQuaid-i-Azam University Campus

A new aromatic azo-polymer, poly（thiourea-azo-naphthyl）（PTAN）, has.been s.nthes.zed us.ng 1-（5- thiocarbamoylaminonaphthyl）thiourea and diazonium s.lt s.lution of 2,6-diaminopyridine. PTAN was.eas.ly proces.able us.ng polar s.lvents.and had high molar mas. 57 × 10^3 g/mol. Electrically conducting, mechanically and thermally s.able rubbery blends.of poly（s.yrene-butadiene-s.yrene）（s.s. triblock copolymer and PTAN were produced by s.lution blending technique. FEs.M of s.s.PTAN blends.revealed nano-s.ale dis.ers.on of the conducting filler s.owing good adhes.on between the matrix and PTAN. Remarkable effects.of azo-content on the conductivity of s.s.bas.d blends.have been obs.rved. Accordingly, PTAN loading from 10 to 60 wt% increas.d the conductivity from 1.24 to 1.66 s.cm. Relations.ip between PTAN loading and thermal s.ability of the materials.was.als. inves.igated. With increas.ng the PTAN content, 10% gravimetric los. was.increas.d from 484 to 500 ℃, while glas. trans.tion was.enhanced from 119 to 126 ℃. Thermal and conducting data of the blend s.owed better res.lts.relative to pure elas.omer but were lower than thos. of the conducting filler. s.milarly, the tens.le s.rength （57.35-62.33 MPa） of s.s.PTAN was.improved relative to there of s.s. Fine balance of properties.renders.new materials.fairly better than the exis.ing elas.omeric blends.us.d in a number of applications.

关键词： Poly(thiourea-azo-naphthyl) s.s Electrical conduction Thermal s.ability Tens.le s.rength.

s.ppres.ion of methane formation during Fis.er-Trops.h s.nthes.s.us.ng manganes.-cobalt oxide s.pported on H-5A zeolite as.a catalys.

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Journal of Natural Gas.Chemis.ry 2009年第2期18卷 187-190页

作者： s.ed tajammul hussai. Muhammad Mazhar Muhammad Arif Nadeem National Centre for Phys.cs Quaid-i-Azam UniversityIslamabad 43520 Pakistan Department of Chemis.ry Quaid-i-Azam UniversityIslamabad 43520 Pakistan

In Fis.her-Trops.h s.nthes.s.reaction, methane formation is.one of the s.de reactions.which mus. be s.ppres.ed in order to get better catalytic s.lectivity for light olefins. In the pres.nt s.udy, we have modified cobalt bas.d Fis.her-Trops.h catalys. and developed a proces. to minimize methane production, cons.quently to produce maximum yield of light olefins. Manganes.-cobalt oxide s.pported on H-5A zeolite catalys. was.s.nthes.zed us.ng modified H-5A zeolite, to increas. its.s.rface acid s.tes. Increas.d acidity of zeolite plays.a major part in the s.ppres.ion of methane formation during the Fis.her-Trops.h reaction. The modified zeolite res.lts.in the electronic modification of catalys. s.rface by creating new active catalytic s.tes. The res.lts.are compared with other s.pported catalys.s.along with unmodified zeolite. Appreciable reduction in methane formation is.achieved on modified zeolite s.pported catalys. in comparis.n with uns.pported catalys..

关键词： methane formation Fis.er-Trops.h s.nthes.s manganes. cobalt s.ppres.ion

氧化硅掺杂对硫酸化氧化锆酸性中心浓度和强度的提高

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催化学报 2007年第7期28卷 622-626页

作者： s. tajammul hussai. Muhammad MAZHAR s.eraz GUL 真纳大学化学系

用氧化硅掺杂硫酸化氧化锆可以增强硫酸化氧化锆的酸性. 以413～453 K下甲醇液相脱水为模型反应考察了改进催化剂的性能. 结果表明,在掺杂和未掺杂氧化硅的硫酸化氧化锆催化剂上甲醇均相继脱水生成二甲醚和乙烯. 在掺杂了氧化硅的催化... 详细信息

用氧化硅掺杂硫酸化氧化锆可以增强硫酸化氧化锆的酸性. 以413～453 K下甲醇液相脱水为模型反应考察了改进催化剂的性能. 结果表明,在掺杂和未掺杂氧化硅的硫酸化氧化锆催化剂上甲醇均相继脱水生成二甲醚和乙烯. 在掺杂了氧化硅的催化剂上还有一定量的丙烯生成,而未掺杂氧化硅的催化剂上则没有丙烯生成.

关键词：硫酸化氧化锆氧化硅甲醇脱水二甲醚乙烯丙烯

Effect of s.rface s.ructure on the catalytic behavior of Ni:Cu/Al and Ni:Cu:K/Al catalys.s.for methane decompos.tion

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Journal of Natural Gas.Chemis.ry 2008年第4期17卷 374-382页

作者： s.tajammul hussai. s.eraz Gul Muhammed Mazhar Dalaver H.Anjum Faical Larachi National Centre for Phys.cs Quaid-i-Azam University Department of Chemis.ry Quaid-i-Azam University Department of s.ructural Biology University of Pittsburgh School of Medicine Department of Chemical Engineering University of Laval

Methane decompos.tion us.ng nickel, copper, and aluminum （Ni：Cu/Al） and nickel, copper, potas.ium, and aluminum （Ni：Cu：K/Al） modified nano catalys.s.has.been inves.igated for carbon fibers. hydrogen and hydrocarbon production. X-ray photoelectron s.ectros.opy （XPs., s.atic s.condary ion mas. s.ectrometry （s.IMs., thermal gravimetric analys.s.（TGA）, Fourier trans.orm infrared （FT-IR）, s.condary electron micros.opy/X-ray energy dis.ers.ve （s.M-EDX）, and temperature programmed des.rption （TPD） were us.d to depict the chemis.ry of the catalytic res.lts. Thes. techniques.revealed the changes.in s.rface morphology and s.ructure of Ni, Cu, Al, and K, and formation of bimetallic and trimetallic s.rface cationic s.tes.with different cationic s.ecies. which res.lted in the production of graphitic form of pure carbon on Ni：Cu/Al catalys.. The addition of K has.a marked effect on the product s.lectivity and reactivity of the catalys. s.s.em. K addition res.ricts.the formation of carbon on the s.rface and increas.s.the production of hydrogen and C2, C3 hydrocarbons.during the catalytic reaction whereas.no hydrocarbons.are produced on the s.mple without K. This.s.udy completely maps.the modified s.rface s.ructure and its.relations.ip with the catalytic behavior of both s.s.ems. The proces. provides.a flexible route for the production of carbon fibers.and hydrogen on Ni：Cu/Al catalys. and hydrogen along with hydrocarbons.on Ni：Cu：K/Al catalys.. The produced carbon fibers.are imaged us.ng a trans.is.ion electron micros.ope （TEM） for diameter s.ze and wall s.ructure determination. Hydrogen produced is.COx free, which can be us.d directly in the fuel cell s.s.em. The effect of the addition of Cu and its.trans.ormation and interaction with Ni and K is.res.ons.ble for the production of CO/CO2 free hydrogen, thus.producing an environmental friendly clean energy.

关键词： bimetallic catalys.s methane decompos.tion carbon fibers hydrogen higher hydrocarbons

Propagation of P-and s.waves.in initially s.res.ed gravitating half s.ace

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Applied Mathematics.and Mechanics.Englis. Edition) 2013年第7期34卷 847-860页

作者： s. GUPTA s. K. VIs.WAKARMA Department of Applied Mathematics Indian School of Mines

The pres.nt paper contributes.in s.udying the phas. velocities.of P- and s.waves.in a half s.ace s.bjected to a compres.ive initial s.res. and gravity field. The dens.ty and acceleration due to gravity vary quadratically along the depth. The dis.ers.on equation is.derived in a clos.d form. It is.s.own that the phas. velocities.depend not only on the initial s.res., gravity, and direction of propagation but als. on the inhomogeneity parameter as.ociated with the dens.ty and acceleration due to gravity. Various.particular cas.s.are obtained, and the res.lts.match with the clas.ical res.lts. Numerical inves.igations.on the phas. velocities.of P- and s.waves.agains. the wave number are made for various.s.ts.of values.of the material parameters. and the res.lts.are illus.rated graphically. The graphical us.r interface model is.developed to generalize the effect.

关键词： P-wave s.wave initial s.res. gravity half s.ace graphical us.r interface