The electrocatalysis of the oxygen reduction reaction (ORR) on carbon supportedPt-V (1:1) catalyst in polymer electrolyte fuel cells (PEFC) was investigated. Atan oxygen pressure of one atm an enhanced electrocatalytic property of Pt-V/Ccompared with Pt/C is revealed. These results indicate the occurrence of adifferent electrocatalytic mechanism for the ORR on Pt/C and Pt-V/C. Anincrease of mas...

In this article the instability of single phase flow in a circular pipe from laminar to turbulence regime has been investigated. To this end, after finding boundary conditions and equation related to instability of flow in cylindrical coordination system, which is called eigenvalue Orr Sommerfeld equation, the solution method for these equation has been investigated. In this article Chebyshev p...

the electrocatalysis of the oxygen reduction reaction (orr) on carbon supportedpt-v (1:1) catalyst in polymer electrolyte fuel cells (pefc) was investigated. atan oxygen pressure of one atm an enhanced electrocatalytic property of pt-v/ccompared with pt/c is revealed. these results indicate the occurrence of adifferent electrocatalytic mechanism for the orr on pt/c and pt-v/c. anincrease of mas...

the electrocatalysis of the oxygen reduction reaction (orr) on carbon supportedpt-v (1:1) catalyst in polymer electrolyte fuel cells (pefc) was investigated. atan oxygen pressure of one atm an enhanced electrocatalytic property of pt-v/ccompared with pt/c is revealed. these results indicate the occurrence of adifferent electrocatalytic mechanism for the orr on pt/c and pt-v/c. anincrease of mas...

J.A. Winger a, D.P. Bazin a,1, W. Benenson a,b, G.M. Crawley a,b, D.J. Morrissey a,c, N.A. Orr a, R. Pfaff a,b, B.M. Sherrill ~,b, M. Steiner ~,b, M. Thoennessen a,b, S.J. Yennello ~ a n d B . M . Y o u n g ~,b National Supereonducting Cylotron Laboratory, Michigan State University, East Lansing, MI, 48824-1321, USA b Department of Physics andAstronomy, Michigan State University, East Lansing, ...

In the work presented here, nitrogen and sulfur co doped on porous graphene was synthesized using pyrolysis at 900°C for 2h and the hydrothermal technique at 180°C for 24h as metal-free electrocatalysts for oxygen reduction reaction (ORR) under alkaline conditions. All the materials have been characterized by Scanning Electron Microscopy (SEM) and X-ray photo-electron spectroscopy (XPS). Moreov...

Science,” co-hosted by Political Studies and The Centre for Research Methods in the Social Sciences, Oxford University, June 2008. I thank Susan Orr for her skeptical comments on this version. I presented earlier versions as a discussion paper at a conference on “Epistemologies of Rational Choice,” Department of Politics, NYU, December 2004 and as part of the Blalock Lectures on Advanced Topics...

Almost exactly IOO years ago, in fact on 23 September, 1880, John Boyd Orr was born quite near here, at Kilmaurs, Ayrshire. It is fitting that this lecture should be given in the University of Glasgow with which he had such close relations, first as a student and research assistant, and later as Rector and finally Chancellor. I think that the best way of paying tribute to this remarkable man in...

For each sequence P = (p1(t), p2(t), . . . ) of polynomials we define a characteristic series of groups, called the derived series localized at P. Given a knot K in S, such a sequence of polynomials arises naturally as the orders of certain submodules of a sequence of higher-order Alexander modules of K. These group series yield filtrations of the knot concordance group that refine the (n)-solv...

in this study ptfeco ternary alloys nanoparticles of three dimentional (3d) rhombus shapes dispersed on graphene nanosheets (ptfeco/gr) were successfully prepared and studied as electrocatalysts for oxygen reduction reaction (orr) in polymer-electrolyte fuel cells. a combination of analytical techniques including powder x-ray diffraction, x-ray photoelectron spectra, inductively coupled plasma-...