An evaluation of superminicomputers for thermal analysis

The feasibility and cost effectiveness of solving thermal analysis problems on superminicomputers is demonstrated. Conventional thermal analysis and the changing computer environment, computer hardware and software used, six thermal analysis test problems, performance of superminicomputers (CPU time, accuracy, turnaround, and cost) and comparison with large computers are considered. Although the CPU times for superminicomputers were 15 to 30 times greater than the fastest mainframe computer, the minimum cost to obtain the solutions on superminicomputers was from 11 percent to 59 percent of the cost of mainframe solutions. The turnaround (elapsed) time is highly dependent on the computer load, but for large problems, superminicomputers produced results in less elapsed time than a typically loaded mainframe computer

An evaluation of superminicomputers for thermal analysis

The use of superminicomputers for solving a series of increasingly complex thermal analysis problems is investigated. The approach involved (1) installation and verification of the SPAR thermal analyzer software on superminicomputers at Langley Research Center and Goddard Space Flight Center, (2) solution of six increasingly complex thermal problems on this equipment, and (3) comparison of solution (accuracy, CPU time, turnaround time, and cost) with solutions on large mainframe computers

A family of higher-order single layer plate models meeting Cz0C^0_z -- requirements for arbitrary laminates

In the framework of displacement-based equivalent single layer (ESL) plate theories for laminates, this paper presents a generic and automatic method to extend a basis higher-order shear deformation theory (polynomial, trigonometric, hyperbolic, ...) to a multilayer $C^0_z$ higher-order shear deformation theory. The key idea is to enhance the description of the cross-sectional warping: the odd high-order $C^1_z$ function of the basis model is replaced by one odd and one even high-order function and including the characteristic zig-zag behaviour by means of piecewise linear functions. In order to account for arbitrary lamination schemes, four such piecewise continuous functions are considered. The coefficients of these four warping functions are determined in such a manner that the interlaminar continuity as well as the homogeneity conditions at the plate's top and bottom surfaces are {\em a priori} exactly verified by the transverse shear stress field. These $C_z^0$ ESL models all have the same number of DOF as the original basis HSDT. Numerical assessments are presented by referring to a strong-form Navier-type solution for laminates with arbitrary stacking sequences as well for a sandwich plate. In all practically relevant configurations for which laminated plate models are usually applied, the results obtained in terms of deflection, fundamental frequency and local stress response show that the proposed zig-zag models give better results than the basis models they are issued from

Optimal distillation of a GHZ state

We present the optimal local protocol to distill a Greenberger-Horne-Zeilinger (GHZ) state from a single copy of any pure state of three qubits.Comment: RevTex, 4 pages, 2 figures. Published version, some references adde

Simulation of anyons with tensor network algorithms

Interacting systems of anyons pose a unique challenge to condensed matter simulations due to their non-trivial exchange statistics. These systems are of great interest as they have the potential for robust universal quantum computation, but numerical tools for studying them are as yet limited. We show how existing tensor network algorithms may be adapted for use with systems of anyons, and demonstrate this process for the 1-D Multi-scale Entanglement Renormalisation Ansatz (MERA). We apply the MERA to infinite chains of interacting Fibonacci anyons, computing their scaling dimensions and local scaling operators. The scaling dimensions obtained are seen to be in agreement with conformal field theory. The techniques developed are applicable to any tensor network algorithm, and the ability to adapt these ansaetze for use on anyonic systems opens the door for numerical simulation of large systems of free and interacting anyons in one and two dimensions.Comment: Fixed typos, matches published version. 16 pages, 21 figures, 4 tables, RevTeX 4-1. For a related work, see arXiv:1006.247

Algorithms for entanglement renormalization

We describe an iterative method to optimize the multi-scale entanglement renormalization ansatz (MERA) for the low-energy subspace of local Hamiltonians on a D-dimensional lattice. For translation invariant systems the cost of this optimization is logarithmic in the linear system size. Specialized algorithms for the treatment of infinite systems are also described. Benchmark simulation results are presented for a variety of 1D systems, namely Ising, Potts, XX and Heisenberg models. The potential to compute expected values of local observables, energy gaps and correlators is investigated.Comment: 23 pages, 28 figure

La ocupación del territorio onubense en época Romana : estado de la cuestión

El presente artículo es una puesta al día en la Investigación de uno de los períodos menos conocidos hasta el momento en el desarrollo histórico del territorio onubense: la ocupación romana. Las intensas investigaciones desarrolladas por parte del Área de Arqueología de la Universidad de Huelva en todo el marco provincial han permitido recuperar y reivindicar este horizonte cultural, además de desechar la idea tradicional de la escasa significación de 'lo romano" en la historia de Huelva en su conjunto. A partir de un intenso programa de intervenciones arqueológicas de campo y laboratorio enmarcadas en numerosos proyectos de investigación y que finalmente han cristalizado en la defensa de nuestra Tesis Doctoral sobre la cuestión, ya disponemos de suficientes elementos de juicio para sostener la equiparación del proceso romanizador del territorio onubense con el del resto de la Provincia Baetica, y donde destacamos como elementos fundamentales, la existencia de diferentes modelos de ocupación y poblamiento en función de factores naturales y culturales previos a la llegada de Roma.______________________________Based on a several archaeological records around all onubense territory — excavation and prospection- this paper analises the signification of the roman period, one of the less knwon in its global history. After years of investigation, we present several conclusions about this moment, where the most important element is conected with different patterns of settlement as a result of a mixture betwen previous natural and cultural space and the roman influence

La economía de Tejada la Nueva (Huelva) a través de las fuentes arqueológicas, numismáticas y textuales

En este artículo vamos a hacer un recorrido diacrónico por la orientación económica de Tejada la Nueva (antigua TUCCI del Itinerario de Antonino), desde la época antigua hasta su despoblación ocurrida a principios del siglo XVI. Para ello vamos a basarnos en el análisis de tres tipos de fuentes: las arqueológicas, a través del estudio tanto de vías antiguas como de asentamientos; nos ocuparemos igualmente de las acuñaciones monetales encontradas en el despoblado de Tejada en el siglo XIX; y finalmente el tercer tipo de fuentes lo constituyen las citas textuales contenidas en la documentación medieval y en menor medida en las fuentes antiguas. Todo ello argumentará la existencia de una economía que a través del tiempo se sustentó en tres pilares fundamentales: la agricultura, la ganadería y la metalurgia.______________________________In this work we are going to do a revision based on the economic aspect of the village Tejada la Nueva (the ancient TUCCI of El Itinerario de Antonino), from the antiquity age to its depopulation, with took place at the beginning of XVIth century a.C. This paper analyses three sources: the archaeologicals remains, to study old ways and sentlements; at the same time we are going to see the coins found in the underpopulated Tejada la Nueva at the XIXth century a.C.; and finally, the last sources font type are the textual references contained in ancient and medieval documents. This study will argue the existence of an economic system that subsisted, through all time, on three basic resources: agriculture, cattle raising and the metallurgy of copper and silver from mines in Tejada and the Corumbel river