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Dysprosium oxide,alumina,and graphene oxide reinf.rced polycaprolactone thin f.lms:Thermal stability,morphology,and cell viability

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Journal of.Rare Earths 2024年第7期42卷 1337-1343,I0005页

作者： Mohamed Tharwat Elabbasy Mohamed R.Atteya Mai A.Samak Mousa Abdelrahman Tahani AlMahmoud M.A.El-Morsy A.A.Menazea M.f.H.Abd El-Kader Department of.Public Health College of Public Health and Health InformaticsUniversity of Ha'ilHa'il2440Saudi Arabia f.od Control Department Faculty of Veterinary MedicineZagazig UniversityZagazig44519Egypt Department of.Physical Therapy College of Applied Medical SciencesUniversity of Ha'ilHa'ilSaudi Arabia Department of.Histology and Cell Biology Faculty of MedicineZagazig UniversityZagazig44519Egypt College of.Nursing University of Ha'ilHa'ilSaudi Arabia College of.Science and Humanities in Al-Kharj Physics DepartmentPlasma Technology and Material Science UnitPrince Sattam Bin Abdulaziz UniversityAl-kharj11942Saudi Arabia Physics Department Faculty of ScienceUniversity of DamiettaNew Damietta34517Egypt Spectroscopy Department Physics Research InstituteNational Research CentreDokki12622GizaEgypt Biophysics Department Faculty of ScienceCairo UniversityGizaEgypt

Developing a biomaterial f.r wound healing applications is still a ***,dysprosium oxide(Dy_(2)O_(3)),aluminum oxide(Al_(2)O_(3)),and graphene oxide(go)were embedded in cast f.lms based on polycaprolactone(PCL)to be examined f.r wound dressing *** techniques were used to characterize the f.bricated f.lms including X-ray dif.raction(XRD),f.urier transf.rm inf.ared spectroscopy(f.IR),Raman,and scanning electron microscopy(SEM),besides their biological *** thermogravimetric analysis(TGA)exhibits high thermal stability as the scaf.old weight decreases slightly to 98.6%af.er raising the temperature f.om room temperature to 280℃.The cell viability was investigated and it is shown that the viable cells grow up to approximately 93%at 75μg/***,the cell attachment shows excellent behavior as the cells attach on most of.the surf.ce of.the modif.ed PCL which shows high biocompatibility.

关键词： Wound healing Polycaprolactone Dy_(2)O_(3) Al_(2)O_(3) Biocompatible Rare earths

Optical and scintillation properties of.Nd-doped SrAl2O4 crystals

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Journal of.Rare Earths 2016年第8期34卷 757-762页

作者： Daisuke Nakauchi go Okada Masanori Koshimizu Takayuki Yanagida Graduate School of.Materials Science.Nara Institute of.Science and Technology(NAIST)8916-5 Takayama-cho lkoma-shiNara 630-0192Japan Department of.Applied Chemistry Graduate School of EngineeringTohoku University 6-6-07 AobaAramakiAoba-ku.Sendai 980-8579.Japan

Nd-doped SrA1204 （Nd：SrA1204） crystals were prepared by a f.oating zone （f.） method with dif.erent dopant concentra- tions. The photoluminescence （PL） measurements under visible light excitations conf.rmed strong near inf.ared （NIR） emissions around 890 nm, which is due to the 4f.4f.transitions of.Nd3＋, and the decay time constants were 300-400 μs. f.rthermore, VUV ex- citations revealed two broad emissions around 250450 and 500-700 run, which were attributed to self.trapped excitons （STEs） perturbed by Nd3＋. Moreover, the X-ray induced scintillation spectra showed some small peaks at around 380 nm in addition to NIR emissions at 1064 nm similarly seen in PL. The f.rmer scintillation decay time constants were 30-40 Its. In the undoped sample, these emissions mentioned above were not present but a weak broad emission around 450 nm appeared. In thermally stimulated lu- minescence （TSL） af.er X-ray irradiation, strong TSL glow peaks were observed in the Nd-doped samples at around 100 and 250 ℃.

关键词： scintillation photoluminescence storage luminescence single crystal rare earths

The role of.rhizobacteria in rice plants: Growth and mitigation of.toxicity

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Journal of.Integrative Agriculture 2018年第12期17卷 2636-2647页

作者： Marcela C f.Rêgo Aline f.Cardoso Thayná da C f.rreira Marta C C de f.lippi Telma f.V Batista Raf.el G Viana Gisele B da Silva Plant Protection Laboratory Institute of Agrarian Sciences Federal Rural University of Amazon Phytopathology Laboratory Brazilian Enterprise for Agricultural Research-Rice and Beans

Allelopathic compounds reduce the growth and productivity of.upland rice plants, especially in consecutive plantations. The rhizobacteria Pseudomonas f.uorescens BRM-32111 and Burkholderia pyrrocinia BRM-32113 have been recorded as growth promoters in rice. This study was developed to understand the ef.ect of.the application of.rhizobacteria on upland rice plants in consecutive plantations. Experiments were conducted in a completely randomized design with f.ur replications of.f.ur treatments: rice seed inoculated with P. f.uorescens BRM-32111, rice seed inoculated with B. pyrrocinia BRM-32113(both sown on soil with rice residue), non-inoculated plants sown on soil with rice residue(control with residue(WR)), and non-inoculated plants on soil with no residue(NR). Roots and seedling growth were adversely af.ected by allelopathic compounds in control WR plants. Plants inoculated with rhizobacteria P. f.uorescens BRM-32111 or B. pyrrocinia BRM-32113 induced an increase of.88% in biomass, 3% in the leaf.area, 40% in length, 67% in root biomass, 21% in chlorophyll a, 53% in chlorophyll(a+b), 50% in rate of.carbon assimilation(A), 227% in A/rubisco carboxylation ef.iciency(Ci) and 63% in water use ef.iciency(WUE) compared to control WR plants. These results indicate that rhizobacteria P. f.uorescens BRM-32111 and B. pyrrocinia BRM-32113 increase the tolerance of.rice plants to stress f.om allelochemicals. There are possible practical agricultural applications of.these results f.r mitigating the ef.ects of.environmental allelochemistry on upland rice.

关键词： allelopathy B.pyrrocinia P.f.uorescens rhizobacteria rice

Oxidation and Coatings f.r Power Generation： New Super Ultra Critical Steam Turbines

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中国腐蚀与防护学报 2009年第4期29卷 318-319页

作者： f. J. PEREZ Grupo de Investigacion de Ingenieria de Superf.cies y Materiales Nanoestructurados U. C. M. N°910627 f.cultad de Ciencias Quimicas Universidad Complutense de Madrid. 28040 Madrid Spain

The steels with chromium contents between 9%and 12%wt are used f.r power plants with advanced steam oxidation *** present good creep properties as 9%Cr steels and good oxidation resistance,at the temperatures range between 500℃～600℃.In the last years numerous investigation in development of.coatings has been realized with the aim the protected them against the oxidation in order to allow operation of.steam turbines at 650℃.In this study,Al-Hf.protective coatings were deposited by CVD-f.R on f.rritic steel HCM-12A f.llowed by a dif.usion heat treatment,have shown to be protective at 650℃under steam f.r at least 3000 hours of.laboratory steam exposure under atmospheric *** and composition of.coatings were characterized by dif.erent techniques, such as scanning electron microscopy(SEM),electron probe microanalysis,and X-ray dif.raction(XRD). On the other hand,volatile species by mass spectrometry(MS) and thermogravimetric measurements (TG) during the initial stages oxidation of.the P92 f.rritic steel without and of.Al and Al/Si coating by chemical vapour deposition in f.uidized bed reactors(CVD-f.R) at 650℃in Ar+20%H_2O f.r 150 h were *** order to go f.rward to coatings design the Thermocalc code is used as base f.r the MSdata. TG-MS experiments were conducted in a closed steam loop in order to obtain inf.rmation about the oxyhydroxides f.rmation as reaction between coatings and *** those results the role of.the dif.erent coating element could be established and optimized f.r the coating *** oxidation mechanism based on the TG-MS results is *** morphology/composition and structure of.the oxidized samples were also studied using SEM/EDS and XRD techniques.

关键词：氧化金属腐蚀防护

Photoluminescence and radioluminescence properties of.(Gd8Ca2)(SiO4)6O2 crystals with dif.erent concentrations of.Ce

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Journal of.Rare Earths 2017年第11期35卷 1071-1076页

作者： Takuya Igashira Masaki Mori go Okada Noriaki Kawaguchi Takayuki Yanagida Graduate School of.Materials Science Nara Institute of Sdence and Technology (NAIST) 8916-5 Takayama Ikoma Nam Japan

(GdCa)(SiO)Oapatite crystals doped with dif.erent concentrations of.Ce were synthesized by the f.oating Zone(f.) method, and we have evaluated the photoluminescence(PL) and radio luminescence(RL) properties. In PL, an emission band appeared around 400 nm under excitation at 300 nm due to the5 d-4 f.transitions of.Ce3+. The PL decay curves were approximated by a second-order exponential decay f.nction, and the derived decay time constants ranged around 20-25 ns and 40-480 ns. Similar emission was observed in RL, but the decay time constants were much longer than those in PL. The RL af.erglow was the lowest in the 1.0% Ce-doped sample. The 1.0% and 2.0% Ce-doped samples showed a f.ll-energy peak in the pulse height spectrum measured underAm 5.5 MeV α-ray irradiation, and the absolute scintillation light yields were estimated to be around 55 and 36 ph/5.5 MeV-a, respectively.

关键词： Scintillator Apatite Ce^(3+) 5d-4f.transition

Photoluminescence, scintillation and thermally-stimulated luminescence properties of.Tb-doped 12CaO·7Al2O3 single crystals grown by f. method

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Journal of.Rare Earths 2017年第10期35卷 957-963页

作者： Narumi Kumamoto Daisuke Nakauchi Takumi Kato go Okada Noriaki Kawaguchi Takayuki Yanagida Graduate School of.Materials Science Nara Institute of Science and Technology (NAIST) 8916-5 Takayama-cho Ikoma-shi Nara 630-0192 Japan

Tb-doped 12CaO·7Al_2O_3（Tb：C12A7） crystals were synthesized by the f.oating zone（f.） method and the photoluminescence（PL）, scintillation and thermally-stimulated luminescence（TSL） properties were investigated. The photoluminescence（PL） emission spectra and PL decay time prof.les were investigated by using Quantaurus-tau（Hamamatsu）. The scintillation spectra and decay time prof.les were measured by using our laboratory-constructed set-up under X-ray irradiation. f.nally, TSL glow curve was measured by using Nanogray TL-2000 with the heating rate of.1 °C/s. In PL and scintillation, emission peaks were observed at 493, 543, 587 and 620 nm due to the 4f.4f.transitions of.Tb3~＋. Decay time constants of.the emission by PL and scintillation appeared to be dif.erent, and the measured values were approximately 2.4 and 1.9 ms, respectively. Af.er X-ray irradiations, the 0.5%（all Tb contents in this paper are in mole f.action） and 1.0% Tb-doped samples showed a single intense and broad glow peak around 100 oC while 1.2%–1.5% Tb-doped samples showed notable additional peak around 250 oC.

关键词： C12A7 single crystal f. terbium scintillation photoluminescence TSL rare earths

Scintillation and optical properties of.Ce-doped YAGG transparent ceramics

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Journal of.Rare Earths 2016年第8期34卷 763-768页

作者： Masaki Mori Jian Xu go Okada Takayuki Yanagida Jumpei Ueda Setsuhisa Tanabe Graduate School of.Materials' Science Nara Institute of Science and Technology (NAIST) 8916-5 Takayama-cho Ikoma-shi Nara 630-0192 Japan Graduate School of.Human and Environmental Studies Kyoto University Yoshida-nihonmatsu-eho Sakyo-ku Kyoto 606-8501 Japan

We investigated photoluminescence （PL） and scintillation properties of.Ce3＋-doped Y3A12Ga3OI2 （Ce：YAGG） trans- parent ceramics synthesized by vacuum sintering with dif.erent Ce3＋ concentrations （mol.%） f.om 0.3% to 1% （0.3%Ce：YAGG, 0.5%Ce：YAGG, 0.8%Ce：YAGG and I%Ce：YAGG）. The samples were synthesized by the vacuum sintering technique. The obtained samples showed a very strong and broad PL emission by the 5dl-4f.transition of.Ce3＋ in the wavelength range f.om 470 to 600 nm. The PL decay prof.les were approximated by a single exponential decay f.nction with the time constants of.around 33-39 ns, f.r- thermore, the scintillation spectra induced by X-rays showed similar f.atures with those observed in PL. The scintillation decay time prof.les f.llowed a second-order exponential decay f.nction. The f.st component group （ranged 3542 ns） were dominantly contrib- uted by the 5d1-4f.transition of.Ce3＋. The pulse height spectra utilizing the latter emissions showed a clear photoabsorption peak. Among those samples tested, 0.5%Ce：YAGG sample showed the highest scintillation light yield of.21,400 ph/MeV under 13VCs y-ray irradiation.

关键词： YAGG cerium transparent ceramic scintillation photoluminescence rare earths

A Review on the Advancement of.Renewable Natural f.ber Hybrid Composites: Prospects, Challenges, and Industrial Applications

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Journal of.Renewable Materials 2024年第7期12卷 1237-1290页

作者： Mohammed Mohammed Jawad K.Oleiwi Aeshah M.Mohammed Anwar Ja’af.r Mohamad Jawad Azlin f.Osman Tijjani Adam Bashir O.Betar Subash C.B.gopinath Center of.Excellence Geopolymer&Green Technology(CEGeoGTech) Universiti Malaysia PerlisArau02600Malaysia f.culty of.Chemical Engineering Technology Universiti Malaysia Perlis(UniMAP)Arau02600Malaysia Department of.Materials Engineering University of TechnologyBaghdad10070Iraq Department of.Chemical Materials University of Bagdad College of Education for Pure Science Ibn-AlhaithamBaghdad10001Iraq Department of.Computer Techniques Engineering Al-Rafidain University CollegeBaghdad10001Iraq f.culty of.Electronics Engineering Technology Universiti Malaysia PerlisKampus Uniciti Alam Sg.ChuchuhPerlis02100Malaysia Research Center(NANOCAT) University of MalayaKuala Lumpur50603Malaysia Institute of.Nano Electronic Engineering Universiti Malaysia PerlisPerlis01000Malaysia Center f.r Global Health Research Saveetha Medical College&HospitalSaveetha Institute of Medical and Technical Sciences(SIMATS)Tamil Nadu602105India

Naturalﬁbre(Nf.)reinf.rced f.nctional polymer composites are quickly becoming an indispensable sustainable material in the transportation industry because of.their lightweight,lower cost in manuf.cture,and adaptability to a wide variety of.***,the major dif.culties of.using theseﬁbres are their existing poor dimensional stability and the extreme *** assessing the mechanical properties(MP)of.composites,the interf.cial bonding(IB)happening between the Nf. and the polymer matrix(PM)plays an incredibly signiﬁcant *** compared to Nf./syntheticﬁbre hybrid composites,hybrid composites(HC)made up of.two separate Nf. are less prevalent;yet,these hybrid composites also have the potential to be valuable materials in terms of.environmental issues.A new dimension to theﬂexibility of.composites reinf.rced with Nf. is added by the cost-ef.ective manuf.cture of.hybrid composites utilising *** purpose of.this study is to of.er an over-view of.the keyﬁndings that were presented on hybrid *** emphasis was f.cused on the f.ctors that inﬂuence the perf.rmance of.the naturalﬁber composites,diverse approaches to enhancing MP,physical,electri-cal,and thermal characteristics of.the *** study in polymer science gains interest f.r applications in con-struction and automotive industries.

关键词： Renewable naturalﬁber hybrid composites sustainability nanomaterial greener material

Indoor and outdoor BTX levels in Barcelona City metropolitan area and Catalan rural areas

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Journal of.Environmental Sciences 2008年第9期20卷 1063-1069页

作者： E. Gallego f. X. Roca X. Guardino M. G. Rosell Environmental Centre Laboratory Polytechnic University of Catalonia (LCMA-UPC) National Centre of.Work Conditions (INSHT)

f.ve aromatic hydrocarbons (benzene, toluene, and three isomeric xylenes) were monitored in indoor and outdoor air of.7 public buildings and 54 private homes, located in Barcelona City metropolitan area and in several rural areas of.Catalonia. The sampling was carried out over f.ur periods: spring-summer and winter of.2000, and summer and winter of.2001. Passive ORSA 5 dra¨ger samplers were used f.r benzene, toluene, and xylenes (BTX) adsorption. BTX were extracted with carbon disulphide and analysed using ...

关键词： benzene toluene and xylenes (BTX) indoor air outdoor air