Zobrazeno 1 - 10
of 1 170
pro vyhledávání: '"Speight J"'
Autor:
Lara, R. I. Garcia, Speight, J. M.
It is proved that the normalized $L^2$ metric on the moduli space of $n$-vortices on a two-sphere, endowed with any Riemannian metric, converges uniformly in the Bradlow limit to the Fubini-Study metric. This establishes, in a rigorous setting, a lon
Externí odkaz:
http://arxiv.org/abs/2210.00966
Autor:
Long R. B., Speight J. G.
Publikováno v:
Oil & Gas Science and Technology, Vol 45, Iss 4, Pp 553-559 (2006)
Application of separation techniques to residua and other heavy feedstocks raises the issue of the most appropriate distillation cut-point for the maximum yield of useful (gas-oil type) liquids. This publication addresses this specific issue and desc
Externí odkaz:
https://doaj.org/article/8702dafc1a4a43469023fcd68a54728c
Autor:
Francisco M. A., Speight J. G.
Publikováno v:
Oil & Gas Science and Technology, Vol 45, Iss 6, Pp 733-740 (2006)
As one part of a research program investigating the composition of petroleum feedstocks, a detailed investigation has been made of the influence of distillation on the distribution of nitrogen, metals and coke precursors originally in a heavy crude o
Externí odkaz:
https://doaj.org/article/e88ddaaa9038496ba2ed895478838069
Publikováno v:
Oil & Gas Science and Technology, Vol 40, Iss 1, Pp 51-61 (2006)
The determination of asphaltene molecular weights is complicated by the tendency of asphaltene molecules to associate with each other and with other petroleum constituents, and reported molecular weights vary from 900 to 300 000. This paper reviews t
Externí odkaz:
https://doaj.org/article/bc75961624514a068f5cc91754df1154
Autor:
Schabron J. F., Speight J. G.
Publikováno v:
Oil & Gas Science and Technology, Vol 52, Iss 1, Pp 73-85 (2006)
Six residua from different crude oils were evaluated for composition and carbon residue forming tendencies. The whole residua were evaluated for elemental composition, trace metals content, carbon residue, and specific gravity. Each residuum was deas
Externí odkaz:
https://doaj.org/article/0a6888f480e24cddb2331c7ca9c88ac4
Autor:
Long R. B., Speight J. G.
Publikováno v:
Oil & Gas Science and Technology, Vol 44, Iss 2, Pp 205-217 (2006)
The composition of petroleum has been the subject of many studies leading to descriptions of petroleum composition in terms of broad generic fractions. The current work shows that petroleum can be described in terms of a mapthat is based upon specifi
Externí odkaz:
https://doaj.org/article/09108c1a575647f5b5bf460e501f4c60
Autor:
Romão, Nuno M., Speight, J. Martin
Publikováno v:
Commun. Math. Phys. 379 (2020) 723-772
The gauged sigma model with target $\mathbb{P}^1$, defined on a Riemann surface $\Sigma$, supports static solutions in which $k_+$ vortices coexist in stable equilibrium with $k_-$ antivortices. Their moduli space is a noncompact complex manifold $M_
Externí odkaz:
http://arxiv.org/abs/1807.00712
Autor:
Speight, J. M.
It is shown that the addition of a single chiral symmetry breaking term to the standard omega meson variant of the nuclear Skyrme model can reproduce the proton-neutron mass difference.
Comment: 8 pages, 2 figures
Comment: 8 pages, 2 figures
Externí odkaz:
http://arxiv.org/abs/1803.11216
Autor:
Lara, R. I. García1 (AUTHOR), Speight, J. M.2 (AUTHOR) j.m.speight@leeds.ac.uk
Publikováno v:
Communications in Mathematical Physics. Nov2023, Vol. 403 Issue 3, p1411-1427. 17p.
Autor:
Flood, S. P., Speight, J. M.
Existence of Maxwell-Chern-Simons-Higgs (MCSH) vortices in a Hermitian line bundle $\L$ over a general compact Riemann surface $\Sigma$ is proved by a continuation method. The solutions are proved to be smooth both spatially and as functions of the C
Externí odkaz:
http://arxiv.org/abs/1708.05348