A Critical Legal Approach to the South China Sea Territorial Dispute

The ‘law of nations’ that colonial powers invoked to claim the South China Sea islands was based not on international convention or custom but on their own municipal laws on guano concession. It provides that states have the exclusive right to assert title over distant islands where their respective citizens have engaged in economic activities. It was applied selectively to advance colonial and maritime interests and to suppress the claim of China. In their own records, the United States and United Kingdom acknowledged China’s prior and exclusive economic activities on the Spratly Islands and Paracel Islands, and consolidation of title over the Paracel Islands. The records were ignored and subsequently revised, thereby excluding China from availing of the rule. The Japanese peace treaties formalized China’s exclusion by relegating its claim to the same category as the claims that emerged from recent acts of occupation, and subjecting it to resolution by convention.link_to_subscribed_fulltex

Reconstruction and analysis of hybrid composite shells using meshless methods

The importance of focusing on the research of viable models to predict the behaviour of structures which may possess in some cases complex geometries is an issue that is growing in different scientific areas, ranging from the civil and mechanical engineering to the architecture or biomedical devices fields. In these cases, the research effort to find an efficient approach to fit laser scanning point clouds, to the desired surface, has been increasing, leading to the possibility of modelling as-built/as-is structures and components’ features. However, combining the task of surface reconstruction and the implementation of a structural analysis model is not a trivial task. Although there are works focusing those different phases in separate, there is still an effective need to find approaches able to interconnect them in an efficient way. Therefore, achieving a representative geometric model able to be subsequently submitted to a structural analysis in a similar based platform is a fundamental step to establish an effective expeditious processing workflow. With the present work, one presents an integrated methodology based on the use of meshless approaches, to reconstruct shells described by points’ clouds, and to subsequently predict their static behaviour. These methods are highly appropriate on dealing with unstructured points clouds, as they do not need to have any specific spatial or geometric requirement when implemented, depending only on the distance between the points. Details on the formulation, and a set of illustrative examples focusing the reconstruction of cylindrical and double-curvature shells, and its further analysis, are presented.info:eu-repo/semantics/publishedVersio

Analysis of sandwich beam structures using kriging based higher order models

Functionally graded composite materials can provide continuously varying properties, which distribution can vary according to a specific location within the composite. More frequently, functionally graded materials consider a through thickness variation law, which can be more or less smoother, possessing however an important characteristic which is the continuous properties variation profiles, which eliminate the abrupt stresses discontinuities found on laminated composites. This study aims to analyze the transient dynamic behavior of sandwich structures, having a metallic core and functionally graded outer layers. To this purpose, the properties of the particulate composite metal-ceramic outer layers, are estimated using Mod-Tanaka scheme and the dynamic analyses considers first order and higher order shear deformation theories implemented though kriging finite element method. The transient dynamic response of these structures is carried out through Bossak-Newmark method. The illustrative cases presented in this work, consider the influence of the shape functions interpolation domain, the properties through-thickness distribution, the influence of considering different materials, aspect ratios and boundary conditions. (C) 2014 Elsevier Ltd. All rights reserved

Analysis of functionally graded sandwich plate structures with piezoelectric skins, using B-spline finite strip method

Functionally graded materials are composite materials wherein the composition of the constituent phases can vary in a smooth continuous way with a gradation which is function of its spatial coordinates. This characteristic proves to be an important issue as it can minimize abrupt variations of the material properties which are usually responsible for localized high values of stresses, and simultaneously providing an effective thermal barrier in specific applications. In the present work, it is studied the static and free vibration behaviour of functionally graded sandwich plate type structures, using B-spline finite strip element models based on different shear deformation theories. The effective properties of functionally graded materials are estimated according to Mori-Tanaka homogenization scheme. These sandwich structures can also consider the existence of outer skins of piezoelectric materials, thus achieving them adaptive characteristics. The performance of the models, are illustrated through a set of test cases. (C) 2012 Elsevier Ltd. All rights reserved

Optimal design of piezolaminated structures using B-spline strip finite element models

A package of B-spline finite strip models is developed for the linear analysis of piezolaminated plates and shells. This package is associated to a global optimization technique in order to enhance the performance of these types of structures, subjected to various types of objective functions and/or constraints, with discrete and continuous design variables. The models considered are based on a higher-order displacement field and one can apply them to the static, free vibration and buckling analyses of laminated adaptive structures with arbitrary lay-ups, loading and boundary conditions. Genetic algorithms, with either binary or floating point encoding of design variables, were considered to find optimal locations of piezoelectric actuators as well as to determine the best voltages applied to them in order to obtain a desired structure shape. These models provide an overall economy of computing effort for static and vibration problems

Metaheuristic optimal design of adaptive composite beams

The first author also wishes to thank the support of Project IPL/2019/MOCHVar/ISEL.The integration of active materials in composite structures confers them the capability of adapting its behaviour when submitted to loads, overcoming a merely passive response. This adaptive character can be further optimized if the adequate design variable parameters are identified and selected. This work presents a study on the use of a metaheuristic bio-inspired technique to optimize (non-)skewed adaptive composite beams where material properties vary along the length. The results illustrate the performance of the analysis-optimization package implemented as well as the possible range of behaviours, beyond the optimal configurations achieved for the set of case studies.publishersversionpublishe

A symbolic simulator platform for the static analysis of thin plates

The integration of symbolic capabilities into a simulation platform devoted to the analysis of thin plates can provide a greater flexibility in the learning process as it enables to incorporate, to experiment and simulate more complex and user-defined characteristics. With the present work one has built a symbolic simulator for the study of the mechanical behaviour of thin plates. These plates, with a rectangular/square basis geometric configuration, are simply supported along its four edges, and can be made from homogeneous or non-homogeneous materials. The capabilities of this platform are briefly illustrated through an illustrative case study.info:eu-repo/semantics/publishedVersio

Ankle Foot Orthosis (AFO) stiffness design for mitigation of ankle inversion injury

Modelling and simulation of human movement has the potential to improve the design of medical devices and rehabilitation process by enabling the identification of cause-effect relationships in individuals suffering from neurological and musculoskeletal issues. The main goal of this work was to provide a simulation-based stiffness design for an Ankle Foot Orthosis (AFO) that can help to mitigate the risk of a sprain by ankle inversion during the landing in freefall which is known to occur for subtalar angles higher than 25 degrees. Computational simulations were performed using human movement models with and without a passive AFO, to access the AFO sensitivity for the translational stiffness that prevents the cuff from translating with respect to the footplate. The Design of Experiments (DoE) methodology was used to access sensitivities between the three principal directions of the AFO stiffness. Results revealed that the ankle inversion angle was less than 25 degrees when increasingly larger values of translational stiffness were used, although a nonlinear behaviour was observed between the three principal directions of the AFO stiffness, for which injury safe design configurations were obtained.info:eu-repo/semantics/publishedVersio

An optimization strategy for customized radiotherapy head immobilization masks

Este trabalho foi financiado pelo Concurso Anual para Projetos de Investigação, Desenvolvimento, Inovação e Criação Artística (IDI&CA) 2016 do Instituto Politécnico de Lisboa. Código de referência IPL/2016/SoftImob_ISELAn effective head immobilization is an important requirement in radiotherapy treatment sessions, although it may also be thought in the future as a precious aid in brain medical imaging. Thus, the present work is focused on the stiffness optimization of a customized head immobilization mask, modelled upon the head reconstruction surface based on computerized tomography images. This paper proposes a strategy supported by a metaheuristic optimization technique and a metamodeling approach for the whole mask, illustrated at its most unfavorable region occurring in the gnathion region.info:eu-repo/semantics/publishedVersio

Analysis of Methodologies of Data Networks LAN

Currently companies offering the service implementation of data networks have seen the need to apply any methodology, the same that can be adapted to the needs of both the client and the organization and also allow direct all processes in the development of the project. However, the use and application of these methodologies aims to reduce failures due to incorrect implementation of the network, it is important to stress that these methodologies provide excellent results as long as the indicated adoption and meet customer needs. That is why the need to analyze the techniques used to implement a network, specifically a network (Local Area Network) LAN type arises; for which an analytical, bibliographical and documentary study, to obtain pertinent and relevant information within the framework of the research was conducted. In addition to the use of criteria for the evaluation of the methodology. As a result, it has been possible to demonstrate that the CISCO methodology is the most widely used thanks to its easy adaptation and implementation projects; plus, it provides a wealth of information and support to users, thereby allowing correct application of its processes