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Composites based on ZrO2-CaAl4O7 using conventional sintering and spark plasma sintering (SPS)
Y.L. Bruni,G. Suarez,Y. Sakka,L.B. Garrido,E.F. Aglietti 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.4
Composites based on ZrO2 stabilized with CaO and CaAl4O7 were sintered via two different techniques: ConventionalSintering route and Spark Plasma Sintering (SPS) between 1200 and 1400 oC. The effectiveness of sintering technique appliedon the stabilization degree of ZrO2 (conversion to c-ZrO2, Ca0.15Zr0.85O1.85), microstructure, densification and Vickers hardnessof the composites was evaluated. The SPS represented a remarkable advance in the c-ZrO2 formation and also resulted in ahigh densification of the composites (inclusive at 1200 oC) which attained relative densities higher than 0.95. The advantageof SPS technique was mainly evidenced by the high densification of composites with high CaAl4O7 content. Therefore, thecomposites sintered by SPS exhibited higher hardness (10 GPa) compared to that of composites produced via conventionalsintering (6 GPa).
Production of excited charm and charm-strange mesons at HERA
Chekanov, S.,Derrick, M.,Magill, S.,Musgrave, B.,Nicholass, D.,Repond, J.,Yoshida, R.,Mattingly, M. C. K.,Antonioli, P.,Bari, G.,Bellagamba, L.,Boscherini, D.,Bruni, A.,Bruni, G.,Cindolo, F.,Corradi, Springer-Verlag 2009 European Physical Journal C Vol.60 No.1
Measurement of the longitudinal proton structure function at HERA
ZEUS Collaboration,Chekanov, S.,Derrick, M.,Magill, S.,Musgrave, B.,Nicholass, D.,Repond, J.,Yoshida, R.,Mattingly, M.C.K.,Antonioli, P.,Bari, G.,Bellagamba, L.,Boscherini, D.,Bruni, A.,Bruni, G.,Cind North-Holland Pub. Co 2009 Physics letters: B Vol.682 No.1
The reduced cross sections for ep deep inelastic scattering have been measured with the ZEUS detector at HERA at three different centre-of-mass energies, 318, 251 and 225 GeV. From the cross sections, measured double differentially in Bjorken x and the virtuality, Q<SUP>2</SUP>, the proton structure functions F<SUB>L</SUB> and F<SUB>2</SUB> have been extracted in the region 5x10<SUP>-4</SUP><x<0.007 and 20<Q<SUP>2</SUP><130 GeV<SUP>2</SUP>.
ZEUS Collaboration,Chekanov, S.,Derrick, M.,Magill, S.,Musgrave, B.,Nicholass, D.,Repond, J.,Yoshida, R.,Mattingly, M.C.K.,Antonioli, P.,Bari, G.,Bellagamba, L.,Boscherini, D.,Bruni, A.,Bruni, G.,Cind North-Holland Pub. Co 2009 Physics letters: B Vol.672 No.2
A search for events with an isolated high-energy lepton and large missing transverse momentum has been performed with the ZEUS detector at HERA using a total integrated luminosity of 504 pb<SUP>-1</SUP>. The results agree well with Standard Model predictions. The cross section for production of single W bosons in electron-proton collisions with unpolarised electrons is measured to be 0.89<SUB>-0.22</SUB><SUP>+0.25</SUP>(stat.)+/-0.10(syst.)pb.
Measurement of D ± and D 0 production in deep inelastic scattering using a lifetime tag at HERA
Chekanov, S.,Derrick, M.,Magill, S.,Musgrave, B.,Nicholass, D.,Repond, J.,Yoshida, R.,Mattingly, M. C. K.,Antonioli, P.,Bari, G.,Bellagamba, L.,Boscherini, D.,Bruni, A.,Bruni, G.,Cindolo, F.,Corradi, Springer-Verlag 2009 European Physical Journal C Vol.63 No.2
Measurement of J/ψ photoproduction at large momentum transfer at HERA
Chekanov, S.,Derrick, M.,Magill, S.,Musgrave, B.,Nicholass, D.,Repond, J.,Yoshida, R.,Mattingly, M. C. K.,Antonioli, P.,Bari, G.,Bellagamba, L.,Boscherini, D.,Bruni, A.,Bruni, G.,Cindolo, F.,Corradi, Springer-Verlag 2010 Journal of high energy physics Vol.2010 No.5
A Method to Optimize Stability and Wheel Wear in Railway Bogies
Mazzola, L.,Alfi, S.,Bruni, S. The Korean Society for Railway 2010 International Journal of Railway Vol.3 No.3
In this paper, a procedure is proposed to optimize bogie suspension parameters in view of minimizing wheel wear produced by curve negotiation, though meeting stability requirements. The problem is dealt with in the form of a constrained minimization problem, in which wheel wear evaluated over a given service scenario is introduced as the cost function to be minimized, and the requirements on vehicle stability are formulated in terms of constraints. The procedure is applied to the case of a non-powered passenger car for high-speed service, and the results obtained are discussed. It is shown that long wheelbase bogie may provide better overall performances than bogies having comparatively short wheelbase. Furthermore, a sensitivity analysis is performed, to define the effect on the optimization results of improving the performances of the yaw dampers in the bogie and of using a different wheel profile.
Anti-Inflammatory and Analgesic Effects of Spartium junceum L. Flower Extracts: A Preliminary Study
Luigi Menghini,Paola Massarelli,Giancarlo Bruni,Rita Pagiotti 한국식품영양과학회 2006 Journal of medicinal food Vol.9 No.3
Our objective was to study the anti-inflammatory and analgesic activity of extract of Spartium junceumL.flowers. Samples of flowers were collected from wild plants, dried, powdered, and extracted with hexane and methanol. Theextracts were evaporated to dryness and then suspended in suitable solvent. They were then tested for anti-inflammatory ac-tivity in the carrageenin rat paw edema test and for analgesic activity in the Randall and Selitto mechanical pressure test andin the tail-flick test. Twenty-four hours after treatment, the gastric mucosa of each rat was observed macroscopically. Basedon these results the hexane extract was fractioned by column chromatography, and the fractions obtained were tested in thesame way. The results showed good anti-inflammatory activity only for a single fraction of the hexane extract, while all theextracts and all the other hexane fractions showed both peripheral and central analgesic activity. In rats treated with the testedcompounds hyperemia and ulcers were absent. The data from this preliminary study reveal interesting pharmacological prop-erties of S. junceumL. flowers extract related to the marked analgesic activity and the absence of gastric ulcerogenic activ-ity.