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En el S. XVI mares y océanos se habían convertido en ajetreadas zonas de paso, confrontación, exploración, etc. por las que pululaban armadas, corsarios, piratas, comerciantes y aventureros tanto de coronas europeas como de reinos... more

En el S. XVI mares y océanos se habían convertido en ajetreadas zonas de paso, confrontación, exploración, etc. por las que pululaban armadas, corsarios, piratas, comerciantes y aventureros tanto de coronas europeas como de reinos norteafricanos y orientales. La corona española centraba su interés en controlar las rutas comerciales, puertos, etc. tanto en las Américas como en el Mediterráneo y Norte de España, para proteger esos mercados tanto de la flota Otomana y los berberiscos en el Mediterráneo como de corsarios y demás enemigos en el Atlántico y pacifico, lo cual determino el sistema naval y defensivo que iba a emplear el imperio.

"For the reconstruction of the military Mycenaean world scarcely we possess the information extracted from diverse slats written in Linear B, as well as the remains of some pictorial representations and scanty archaeological remains... more

"For the reconstruction of the military Mycenaean world scarcely
we possess the information extracted from diverse slats written in Linear B, as well as the remains of some pictorial representations and scanty archaeological remains extracted from warriors' diverse tombs. It is for it that the reconstruction of this important aspect inside the Mycenaean culture is not simple, and in this respect it turns out very interesting to manage to raise approximations as the one that occupies us. Across the analysis of few remains which we possess,It occupies. Across the analysis of few remains which we possess, authors of John Chadwick's taya have proposed interesting theories on the Mycenaean systems of defense and, in this case, we will try to approach each other the system that could be used in Pilo's accession."

Page 1. A Facility Reliability Problem: Formulation, Properties, and Algorithm Michael Lim,1 Mark S. Daskin,2,3 Achal Bassamboo,3 Sunil Chopra3,2 1 Department of Business Administration, University of Illinois at Urbana–Champaign,... more

Page 1. A Facility Reliability Problem: Formulation, Properties, and Algorithm Michael Lim,1 Mark S. Daskin,2,3 Achal Bassamboo,3 Sunil Chopra3,2 1 Department of Business Administration, University of Illinois at Urbana–Champaign, Champaign, Illinois 61820 ...

In this article, we consider a multi-product closed-loop supply chain network design problem where we locate collection centers and remanufacturing facilities while coordinating the forward and reverse flows in the network so as to... more

In this article, we consider a multi-product closed-loop supply chain network design problem where we locate collection centers and remanufacturing facilities while coordinating the forward and reverse flows in the network so as to minimize the processing, transportation, and fixed location costs. The problem of interest is motivated by the practice of an original equipment manufacturer in the automotive industry that provides service parts for vehicle maintenance and repair. We provide an effective problem formulation that is amenable to efficient Benders reformulation and an exact solution approach. More specifically, we develop an efficient dual solution approach to generate strong Benders cuts, and, in addition to the classical single Benders cut approach, we propose three different approaches for adding multiple Benders cuts. These cuts are obtained via dual problem disaggregation based either on the forward and reverse flows, or the products, or both. We present computational results which illustrate the superior performance of the proposed solution methodology with multiple Benders cuts in comparison to the branch-and-cut approach as well as the traditional Benders decomposition approach with a single cut. In particular, we observe that the use of multiple Benders cuts generates stronger lower bounds and promotes faster convergence to optimality. We also observe that if the model parameters are such that the different costs are not balanced, but, rather, are biased towards one of the major cost categories (processing, transportation or fixed location costs), the time required to obtain the optimal solution decreases considerably when using the proposed solution methodology as well as the branch-and-cut approach. © 2007 Wiley Periodicals, Inc. Naval Research Logistics, 2007

Natural convection in two-dimensional rectangular enclosure is studied numerically using a finite element method. In the present study, top wall is considered adiabatic, two vertical walls are maintained at constant low temperature, the... more

Natural convection in two-dimensional rectangular enclosure is studied numerically using a finite element method. In the present study, top wall is considered adiabatic, two vertical walls are maintained at constant low temperature, the bottom wall is maintained at constant high temperature and the non-heated parts of the bottom wall are considered adiabatic. The aim of this work is to demonstrate the capabilities of this numerical methodology for handling such problems. The pressure-velocity form of the Navier–Stokes equations and energy equation are used to represent the mass, momentum, and energy conservations of the fluid medium in the enclosure. The finite element formulations of the dimensionless governing equations with the associated boundary conditions are solved by a nonlinear coupled solution algorithm using six-noded triangular element discretization scheme for all the field variables. The Grashof number is varied from 10 3 to 10 6 and Prandtl number is taken as 0.71. Th...

The expansion of India’s role as a security provider in the Indian Ocean region has aroused much interest in recent years. Many inside and outside India see great potential for India, and particularly the Indian Navy, to play a positive... more

The expansion of India’s role as a security provider in the Indian Ocean region has aroused much interest in recent years. Many inside and outside India see great potential for India, and particularly the Indian Navy, to play a positive role in enhancing the region’s security in the context of India’s rise as a major power. Over the last several decades, India has developed good security relationships in the Indian Ocean, particularly with island or small littoral states such as Mauritius, Seychelles and Madagascar in the southwest Indian Ocean, Oman and Qatar in the Persian Gulf, the Maldives in the central Indian Ocean and Singapore in the east. India is now seen as a key security provider to, and even a security guarantor of, several of these states. However, the history of India’s strategic role in the Indian Ocean has not been the subject of a great deal of study. This article will examine India’s previously undisclosed interventions in the Seychelles in 1986, which acted as a ...

A finite element method based computational study of steady laminar mixed convection flow inside a vented square cavity with a heat conducting horizontal solid circular cylinder placed at the center of the cavity is carried out in this... more

A finite element method based computational study of steady laminar mixed convection flow inside a vented square cavity with a heat conducting horizontal solid circular cylinder placed at the center of the cavity is carried out in this paper. The developed mathematical model is governed by the coupled equations of continuity, momentum and energy. The present work simulates practical systems such as cooling of electronic devices, ventilation of building etc. The effects of cylinder size and Richardson number on fluid flow and heat transfer performance are investigated. Richardson number is varied from 0.0 to 5.0 and the cylinder diameter is varied from 0.0 to 0.6. The results for the case of without cylinder are compared to those with cylinder to observe the effects cylinder on the flow and heat transfer inside the cavity. The phenomenon inside the cavity for the case of with and without cylinder is analyzed through streamline and isotherm patterns. It is found that the streamlines, ...

In this paper an inventory model with several demand classes, prioritised according to importance, is analysed. We consider a lot-for-lot or (S − 1, S) inventory model with lost sales. For each demand class there is a critical stock level... more

In this paper an inventory model with several demand classes, prioritised according to importance, is analysed. We consider a lot-for-lot or (S − 1, S) inventory model with lost sales. For each demand class there is a critical stock level at and below which demand from that class is not satisfied from stock on hand. In this way stock is retained to meet demand from higher priority demand classes. A set of such critical levels determines the stocking policy. For Poisson demand and a generally distributed lead time, we derive expressions for the service levels for each demand class and the average total cost per unit time. Efficient solution methods for obtaining optimal policies, with and without service level constraints, are presented. Numerical experiments in which the solution methods are tested demonstrate that significant cost reductions can be achieved by distinguishing between demand classes. © 2002 Wiley Periodicals, Inc. Naval Research Logistics 49: 593–610, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/nav.10032

In the first book-length examination of the connections between the commercial fishing industry in colonial America and the American Revolution, Christopher Magra places the origins and progress of this formative event in a wider Atlantic... more

In the first book-length examination of the connections between the commercial fishing industry in colonial America and the American Revolution, Christopher Magra places the origins and progress of this formative event in a wider Atlantic context. The Fisherman's Cause utilizes extensive research from archives in the United States, Canada, and the U.K. in order to take this Atlantic approach. Dried, salted cod represented the most lucrative export in New England. The fishing industry connected colonial producers to transatlantic markets in the Iberian Peninsula and the West Indies. Parliament's coercive regulation of this branch of colonial maritime commerce contributed to colonists' willingness to engage in a variety of revolutionary activities. Colonists then used the sea to forcibly resist British authority. Fish merchants converted transatlantic trade routes into military supply lines, and they transformed fishing vessels into warships. Fishermen armed and manned the first American navy, served in the first coast guard units, and fought on privateers. These maritime activities helped secure American independence.