1,177 research outputs found
Shape files for Phd thesis 'Traveling in the Roman mediterranean a gis approach
No full textShape file datasets used in 'Travelling in the Roman Mediterranean a GIS approach' a phd thesis by David Potts Feburary 2019</span
Bulk and boundary scattering in the q-state potts mode
No full textThis thesis is concerned with the properties of 1 + 1 dimensional massive field theories in both infinite and semi-infinite geometries. Chapters 1, 2 and 3 develop the necessary theoretical framework and review existing work by Chim and Zamolodchikov [1] on integrable perturbations of the (bulk) q-state Potts model, the particular model under consideration in this thesis. Chapter 4 consists of a detailed analysis of the bootstrap for this model, during the course of which unexpected behaviour arises. The treatment of 1] has consequently been revised, but further investigation will be necessary before complete understanding of this behaviour can be reached. In the final chapter, attention turns to the imposition of boundary conditions on two dimensional systems. After looking at this from a statistical mechanical point of view, a brief review of boundary conformal held theory and its integrable perturbations is given. This leads once more to a consideration of the q-state Potts model. After summarising [2], where fixed and free boundary conditions are considered, a third and previously untreated boundary condition is discussed
[Amnesty Letter] ID208 / Potts, John L.
No full textThis letter was written by John L. Potts to President Andrew Johnson in response to the President's Amnesty Proclamation of 29 May 1865. The writer indicates his county of residence as Jackson Co., NC and states his occupation as Farmer
Approaches for solving some scheduling and routing problems
No full textWe study approaches for finding good solutions, and lower bounds, for three difficult combinatorial optimisation problems.The supply ship travelling salesman problem is a simplification of a situation faced by a naval logistics coordinator who must direct a support vessel tasked with resupplying ships in a fleet. It is a generalisation of the travelling salesman problem in which the nodes are in motion, each following some predetermined route. We apply dynamic programming state-space relaxation
techniques, producing lower bounds for the problem that are 73% to 84% of the best solution, on average. We also apply heuristics to find good solutions to this NP-hard problem, showing that restricted dynamic programming approaches outperform simple 2-opt and 3-opt local search procedures
for instances with 20 nodes.We introduce the supply ship scheduling problem, another roblem inspired by a support vessel environment. We wish to minimise the number of mobile machines required to process a set of jobs; each job is in a different stationary location and features a fixed start time. Jobs may be simultaneously processed by multiple machines, obtaining a speed-up in processing time. We represent the problem as a directed graph and use the minimum flow in a transformed network to determine the minimum number of machines. We present a neighbourhood structure based on the maximum cut, applying it
within descent and tabu search procedures. We construct a restricted dynamic programming based approach, but this is outperformed by the tabu search algorithm.The task allocation problem, arising in distributed computing, is to assign a set of tasks to a set of processors so that the overall cost is minimised. Costs are incurred from processor usage, interprocessor communication and task execution. We construct, and try to improve, semidefinite programming relaxations to find lower bounds for variants of this NP-hard problem. We develop a branch-and-bound approach to find optimal solutions, but this is only effective for small instances
Frederic Potts
No full text23Frederic Arnold Potts was born in 1892 to William Andrew Potts and his wife Louisa (nee Bates) who married in Norwood, South Australia in 1886. Reverend William Andrew Potts emigrated from England to South Australia where he played a pioneering role in the establishment of the Adelaide Central Mission. He rose to become President of the Conference in South Australia. Frederic was one of nine children born to the couple; Hubert born at the Moonta Mines in South Australia in 1887; Ethelwyn born in Gumeracha, South Australia in 1889; Gilbert MacDonald born in Guildford in 1890; William Andrew born in Guildford in 1891; Eleanor born in Fremantle in 1893; Louise Stanway born in Fremantle; Frank Ronald born in Fremantle in 1896; and Harry Lincoln. Frederic attended Prince Alfred College in Adelaide. He proceeded from school to study at the School of Mines and Industries winning dux of school and a gold medal in 1907. Frederic was a member of the NT Survey Department prior to enlisting in 1915. He left Darwin on the SS 'Mataram' on 9 May 1915. Frederic returned from the war and married Violet Leone Francis in South Australia on 24 December 1935. They moved to Western Australia where they appear on electoral rolls from 1937. Frederic died, aged 87 years in Perth, Western Australia. He was still registered to vote.Potts? unit embarked from Sydney on board SS ?Hawkes Bay? on 20 April 1916. He was commissioned as a Lieutenant and then later promoted to 2nd Lieutenant on 1 June 1918. Potts was wounded on 16 September 1918 and transferred to England from France, dangerously ill with a gunshot wound to the right thigh on 21 September 1918. His brother, Frank Roland (14101) was also wounded in France. Potts returned to Australia on 16 March 1919 and was discharged on 27 June 1919.SurveyorAustralian Imperial Force13th Field Company Engineers, 2nd Reinforcement
Travelling in the Roman Mediterranean a GIS approach
No full textThis thesis applies new methods to understanding and interpreting the structure of the Mediterranean basin through three different specific studies (chapters 5 to 7), each of which applies several different GIS technologies to create a theoretical model of the wind and wave environment of the Mediterranean during the period of the Roman Empire.The first of these studies the Mediterranean in terms of its geomorphology, and considers possible movement between areas of the Roman Empire.The second examines the interconnectivity properties between different port locations in the Mediterranean basin using routes between different known locations and spheres of contact.The third examines the possible movement patterns along a known axis of travel between two documented port locations in the Mediterranean basin
John Potts, The New Time and Space
No full textJohn Potts, Professor of Media at Macquarie University, Australia, is no newcomer to the domain of media studies. Some of his outstanding publications, like Radio in Australia (New South Wales University Press, 1989), Culture and Technology (with Andrew Murphie, Palgrave Macmillan, 2002) and Technologies of Magic (co-edited with Edward Scheer, Sydney: Power Publications, 2011), have established his credentials and revealed the versatility of his knowledge in the field. The New Time and Space,..
The Charles Potts Collection: Cataloging a Cultural Movement
No full textCounter-culture poet, activist, entrepreneur, and publisher, Charles Potts donated his personal poetry library and papers to Utah State University’s Special Collections and Archives in 2011 During his time at Berkeley, Potts\u27 describes himself as a ‘revolutionary hippie’ in the counter-culture poetry scene. Overall, this great American poet has spent nearly 50 years as an author of numerous books containing compilations of his postmodern poetry as well as full length novels and even a screenplay
Critical properties of quantum three- and four-state Potts models with boundaries polarized along the transverse field
No full textBy computing the low-lying energy excitation spectra with the density matrix
renormalization group algorithm we show that boundaries polarized in the
direction of the transverse field lead to scale-invariant conformal towers of
states at the critical point of the quantum four-state Potts model - a special
symmetric case of the Ashkin-Teller model. Furthermore, by direct comparison of
the excitation spectra we phenomenologically establish the duality between the
transverse-polarized and three-state-mixed boundary conditions at the
four-state Potts critical point. Finally, for completeness, we verify that in
the quantum three-state Potts model the "new" boundary conditions dual to the
mixed ones can be realized by polarizing edge spins along the transverse field.Comment: 19 pages, 7 figure
Proof of the determinantal form of the spontaneous magnetization of the superintegrable chiral Potts model
No full textThe superintegrable chiral Potts model has many resemblances to the Ising model, so it is natural to look for algebraic properties similar to those found for the Ising model by Onsager, Kaufman and Yang. The spontaneous magnetization can be written in terms of a sum over the elements of a matrix . The author conjectured the form of the elements, and this conjecture has been verified by Iorgov et al. The author also conjectured in 2008 that this sum could be expressed as a determinant, and has recently evaluated the determinant to obtain the known result for . Here we prove that the sum and the determinant are indeed identical expressions. Since the order parameters of the superintegrable chiral Potts model are also those of the more general solvable chiral Potts model, this completes the algebraic calculation of for the general model.
doi:10.1017/S144618111000078
- …
