-
t-topology on the n-dimensional Minkowski space
Posted on May 19th, 2009 No commentsGunjan Agrawal and Sampada Shrivastava<br/> In this paper, a topological study of the n-dimensional Minkowski space, n>1, with t-topology, denoted by M, has been carried out. This topology, unlike the usual Euclidean one, is more physically appealing being defined by means of the Lorentzian metric. It shares many topological properties with s … [J. Math. Phys. 50, 053515 (2009)] published Tue May 19, 2009.
-
On a class of solutions of the EinsteinMaxwell field equations in scalar-tensor theories of gravity
Posted on May 19th, 2009 No commentsA. A. R. Sobreira, Geusa de A. Marques, J. B. Fonseca-Neto, and V. B. Bezerra<br/> In this paper we obtain a class of static cylindrically symmetric solutions of the EinsteinMaxwell field equations in the framework of scalar-tensor theories of gravity. In this context, in which both a Maxwell field and a dilaton field are sources of the stress energy, the solutions were obtained b … [J. Math. Phys. 50, 052502 (2009)] published Tue May 19, 2009.
-
A method of reduction of order for discrete systems
Posted on May 19th, 2009 No commentsP. R. Gordoa and A. Pickering<br/> We show how, by establishing a suitable Backlund correspondence, a reduction in order can be effected for discrete systems having a certain structure. In this way we succeed in extending to discrete systems ideas previously developed within the context of ordinary differential equations. It is also … [J. Math. Phys. 50, 053513 (2009)] published Mon May 18, 2009.
-
On higher dimensional black holes with Abelian isometry group
Posted on May 19th, 2009 No commentsPiotr T. Chrusciel<br/> We consider (n+1)-dimensional, stationary, asymptotically flat, or KaluzaKlein asymptotically flat dark holes with an Abelian s-dimensional subgroup of the isometry group satisfying an orthogonal integrability condition. Under suitable regularity conditions, we prove that the area of the group orbi … [J. Math. Phys. 50, 052501 (2009)] published Mon May 18, 2009.
-
On computational complexity of Clifford algebra
Posted on May 19th, 2009 No commentsMarco Budinich<br/> After a brief discussion of the computational complexity of Clifford algebras, we present a new basis for even Clifford algebra Cl(2m) that simplifies greatly the actual calculations and, without resorting to the conventional matrix isomorphism formulation, obtains the same complexity. In the last p … [J. Math. Phys. 50, 053514 (2009)] published Mon May 18, 2009.
-
Photoemission study of C-induced barrier reduction for hole injection at N, N-bis(naphthalene-1-y1)-N, N-bis(phenyl) benzidine/Al
Posted on May 19th, 2009 No commentsZ. T. Xie, B. F. Ding, X. D. Gao, Y. T. You, Z. Y. Sun et al.<br/> Synchrotron radiation photoemission study showed that the energy level alignment at the interface between N, N-bis(naphthalene-1-y1)-N, N-bis(phenyl) benzidine (NPB), a typical hole transport material, and Al could be adjusted by precovering a thin C layer on Al. The interface dipoles so formed coul … [J. Appl. Phys. 105, 106105 (2009)] published Mon May 18, 2009.
-
Coherent homogenization of periodic structures: Transformation from structurally periodic (photonic band gap) structures to optically uniform materials
Posted on May 19th, 2009 No commentsS. M. Sadeghi and W. Li<br/> A relevant feature of periodic structures that serves as the cornerstone of many optical devices and photonic systems is alternative variations of refractive index and/or gain (loss). In this paper we will show how in Bragg multiquantum well active photonic gap structures, wherein refractive index p … [J. Appl. Phys. 105, 104301 (2009)] published Mon May 18, 2009.
-
Direct measurements of the alpha-epsilon transition stress and kinetics for shocked iron
Posted on May 19th, 2009 No commentsB. J. Jensen, G. T. Gray, III, and R. S. Hixson<br/> Iron undergoes a polymorphic phase transformation from the alpha-phase (bcc) to the epsilon-phase (hcp) when compressed to stresses exceeding 13 GPa. Because the epsilon phase is denser than the alpha phase, a single shock wave mechanics is unstable and breaks up into an elastic wave mechanics, a plastic wave mechanics, and a ph … [J. Appl. Phys. 105, 103502 (2009)] published Mon May 18, 2009.
-
Thermal stability of Ba(ZrCeY)O ceramics in carbon dioxide
Posted on May 19th, 2009 No commentsC.-S. Tu, R. R. Chien, V. H. Schmidt, S.-C. Lee, C.-C. Huang et al.<br/> In situ x-ray diffraction spectra (251000 degrees C) have been measured as a function of temperature for proton-conducting Ba(ZrCeY)O (x=0.00.4) ceramics in CO atmosphere. Atomic vibrations before and after exposure to CO were obtained by using the micro-Raman scattering (1501600 cm). Ba(ZrY)O an … [J. Appl. Phys. 105, 103504 (2009)] published Mon May 18, 2009.
-
Self-assembled Gd silicide nanostructures grown on Si(001)
Posted on May 19th, 2009 No commentsGangfeng Ye, Martin A. Crimp, and Jun Nogami<br/> The growth of self-assembled gadolinium silicide nanostructures on Si(001) was studied over a range of metal coverages and growth temperatures. Scanned probe microscopy was used to study the nanostructure morphology. The analyses of cross-sectional transmission electron microscopy images, plan view … [J. Appl. Phys. 105, 104304 (2009)] published Mon May 18, 2009.