Numerical investigation of seawater intrusion at Gooburrum, Bundaberg, Queensland, Australia

Seawater intrusion in coastal agricultural areas due to groundwater abstraction is a major environmental problem along the northeastern coast of Australia. Management options are being explored using numerical modelling, however, questions remain concerning the appropriate level of sophistication in models, choice of seaward boundary conditions, and how to accommodate heterogeneity and data uncertainty. The choice of seaward boundary condition is important since it affects the amount of salt transported into the aquifers and forms the focus of the present study. The impact of this boundary condition is illustrated for the seawater-intrusion problem in the Gooburrum aquifers, which occur within Tertiary sedimentary strata. A two-dimensional variable-density groundwater and solute-transport model was constructed using the computer code 2DFEMFAT (Cheng et al. 1998). The code was tested against an experiment for a steady-state freshwater-saltwater interface and against the Elder (Elder 1967) free-convection problem. Numerical simulations show that the imposition of the commonly-used equivalent hydrostatic freshwater heads, combined with a constant salt concentration at the seaward boundary, results in overestimated seawater intrusion in the lower Gooburrum aquifer. Since the imposition of this boundary condition allows water flow across the boundary, which subsequently takes salt into the aquifer, a careful check is essential to estimate whether too much mass of salt is introduced.

A parallel implementation of the lattice solid model for the simulation of rock mechanics and earthquake dynamics

The Lattice Solid Model has been used successfully as a virtual laboratory to simulate fracturing of rocks, the dynamics of faults, earthquakes and gouge processes. However, results from those simulations show that in order to make the next step towards more realistic experiments it will be necessary to use models containing a significantly larger number of particles than current models. Thus, those simulations will require a greatly increased amount of computational resources. Whereas the computing power provided by single processors can be expected to increase according to Moore's law, i.e., to double every 18-24 months, parallel computers can provide significantly larger computing power today. In order to make this computing power available for the simulation of the microphysics of earthquakes, a parallel version of the Lattice Solid Model has been implemented. Benchmarks using large models with several millions of particles have shown that the parallel implementation of the Lattice Solid Model can achieve a high parallel-efficiency of about 80% for large numbers of processors on different computer architectures.

Atmospheric boundary layer development over a narrow coastal plain during onshore flow

A study of the structure of the daytime atmospheric boundary layer during onshore flow over a narrow coastal plain is presented. The main emphasis of the study is on the nature and causes of heating and cooling observed in the boundary layer temperature profiles. Measurements included vertical temperature profiles above at least two sites derived from radiosondes and aircraft, as well as surface estimates of radiative and sensible heat fluxes. Surface meteorological and pilot balloon data were also available, providing further evidence of short-term changes in atmospheric boundary layer structure. The Manawatu case was representative of autumnal anticyclonic conditions with weak pressure gradients, and illustrated typical diurnal development of a convective boundary layer over a coastal plain bordered by mountain ranges, with a transition from a stable nocturnal situation to a well-mixed profile in the afternoon. The profiles show surface input of heat propagating upwards through the boundary layer during the day, as well as entrainment of heat at the top associated with shear induced turbulence and/or penetrative convection. Applying a one-dimensional model, estimates of boundary layer heat budget components were obtained for four time periods during the day. Later periods were affected by cumulus cloud development at the top of the boundary layer, resulting in significant changes in individual components. Input of sensible heat from the surface decreased, while the addition of heat to the boundary layer from both cloud condensation and advection increased.

High-field magnetic resonance imaging with reduced field/tissue RF artefacts - A modeling study using hybrid MoM/FEM and FDTD technique

Due to complex field/tissue interactions, high-field magnetic resonance (MR) images suffer significant image distortions that result in compromised diagnostic quality. A new method that attempts to remove these distortions is proposed in this paper and is based on the use of transceiver-phased arrays. The proposed system uses, in the examples presented herein, a shielded four-element transceive-phased array head coil and involves performing two separate scans of the same slice with each scan using different excitations during transmission. By optimizing the amplitudes and phases for each scan, antipodal signal profiles can be obtained, and by combining both the images together, the image distortion can be reduced several fold. A combined hybrid method of moments (MoM)/finite element method (FEM) and finite-difference time-domain (FDTD) technique is proposed and used to elucidate the concept of the new method and to accurately evaluate the electromagnetic field (EMF) in a human head model. In addition, the proposed method is used in conjunction with the generalized auto-calibrating partially parallel acquisitions (GRAPPA) reconstruction technique to enable rapid imaging of the two scans. Simulation results reported herein for 11-T (470-MHz) brain imaging applications show that the new method with GRAPPA reconstruction theoretically results in improved image quality and that the proposed combined hybrid MoM/FEM and FDTD technique is. suitable for high-field magnetic resonance imaging (MRI) numerical analysis.

Stochastic modelling and simulations for solute transport in porous media

A stochastic model for solute transport in aquifers is studied based on the concepts of stochastic velocity and stochastic diffusivity. By applying finite difference techniques to the spatial variables of the stochastic governing equation, a system of stiff stochastic ordinary differential equations is obtained. Both the semi-implicit Euler method and the balanced implicit method are used for solving this stochastic system. Based on the Karhunen-Loeve expansion, stochastic processes in time and space are calculated by means of a spatial correlation matrix. Four types of spatial correlation matrices are presented based on the hydraulic properties of physical parameters. Simulations with two types of correlation matrices are presented.

The network structure of a regional tourism organization: Application of he social network theory in one region of Queensland

Regional tourism organizations (RTOs) plays a central role in planning, coordinating and marketing tourism in many areas, including Queensland, Australia. RTOs rely on interaction with a network of other organizations for their efficient functioning. This paper describes an exploratory case study that develops a method for use of social network analysis techniques to analyse the inter-organizational network in one RTO region in Queensland. Results indicate that differences exist in the structure of inter-organizational links between commercial tourism organizations and planning organizations, between tourism organizations and other sectoral clusters, and between organizations at local, regional and state levels. The results highlight areas or improvement in the role and responsibilities of RTOs in Queensland.

ANÁLISE DO DISCURSO RELIGIOSO: MARCAS DA PÓS-MODERNIDADE NAS PRÉDICAS DE UMA IGREJA METODISTA NO ABC

Este trabalho, situado na área de Práxis Religiosa e Sociedade, analisa a interação entre o protestantismo brasileiro e a Pós-modernidade, possibilitando uma observação de certas mudanças e/ou transformações que este intercâmbio provoca neste setor religioso aproximando-o ou distanciando de algumas características próprias de suas origens protestantes. Para tanto, restringe-se ao metodismo, especificamente, uma Igreja Metodista no ABC e, por meio de uma pesquisa qualitativa, avalia como algumas marcas pósmodernas circulam nas prédicas proferidas na comunidade escolhida, ou seja, a Igreja Metodista em Santo André. O método analítico utilizado é a Análise do Discurso de linha bakhtiniana, cuja apreciação avalia a prédica como discurso verbal relacionado a uma situação social extraverbal que o engendra. Entretanto, nesta proposta de reflexão crítica, faz-se uso, também, das contribuições profícuas de outras áreas do saber, isto é, da Teologia (homilética) e da Sociologia do Protestantismo que permitem uma compreensão mais ampla dos assuntos tratados.(AU)

DONA FLOR E SEUS DOIS MARIDOS: O LIVRO E A MINISSÉRIE

Este trabalho é centrado na análise de Dona Flor e seus dois maridos, minissérie produzida pela Rede Globo de Televisão em 1997, para o horário das 22 horas e veiculada na emissora, em 20 capítulos. Com direção geral de Mauro Mendonça Filho foi adaptada por Dias Gomes, com co-autoria de Marcílio Moraes e Ferreira Gullar a partir do romance homônimo do escritor baiano Jorge Amado, publicado pela primeira vez em maio de 1966 pela editora Livraria Martins, com tiragem de 75 mil exemplares. Nosso objetivo foi verificar qualitativamente o tratamento dado a um tema específico, presente no romance e na minissérie, qual seja, a culinária, na passagem do romance para o produto televisivo, sob o foco do erotismo. Como metodologia utilizamos o método qualitativo, e como técnica, a análise de conteúdo. Demonstrou-se que na passagem do romance para a televisão, a culinária foi retratada de forma menos erotizada, em relação ao livro, em função da exigência do suporte, bem como sua inserção tratou de evidenciar o caráter regional da minissérie.(AU)

COMPARAÇÃO DE MEDIDAS CEFALOMÉTRICAS DOS ESPAÇOS AÉREOS NASO E OROFARÍNGEO ENTRE RESPIRADORES NASAIS E ORAIS

A literatura tem evidenciado que o modo respiratório alterado influencia nos aspectos estruturais e funcionais do sistema estomatognático. Objetivo: Comparar as medidas cefalométricas dos espaços aéreos naso e orofaríngeo entre respiradores nasais e com modo respiratório alterado (orais ou oronasais). Método: Este estudo de caráter exploratório e retrospectivo utilizou os prontuários de pacientes atendidos na Clínica de Ortodontia, compreendendo o período de 2000 a 2009, sendo que dos 87 indivíduos (má oclusão Classe I de Angle) que compuseram a amostra, 55 eram respiradores nasais (RN) e 32 apresentavam modo respiratório alterado (RON - oronasal ou oral), 47 pertenciam ao sexo feminino e 40 ao masculino, com idades entre 8,75 e 22 anos (média de 14,78 anos). Foram analisadas as telerradiografias em norma lateral, não submetidos a tratamento ortodôntico ou fonoaudiológica prévios. As variáveis de análise foram: idade, sexo, raça, modo respiratório e análise dos espaços naso e orofaringeano pelo método adotado por Zanelato. Por meio de análise estatística (teste t de Student e quiquadrado), os resultados foram interpretados quanto à sua significância. Resultados: Houve diferença estatisticamente significante quanto à idade dos grupos (RN>RON); de prevalência de homens (maior no grupo RON), de leucodermas em ambos os grupos, de via aérea súpero-anterior (menor no grupo RON) e tonsila faríngea (maior no grupo RON); e de tamanho de tonsila faríngea em melanodermas. As demais variáveis de análise não evidenciaram diferenças estatisticamente significantes. Conclusão: As medidas cefalométricas do espaço nasofaringeano (menor no grupo RON) e da tonsila faríngea (maior no grupo RON) diferiram entre os grupos e o espaço orofaringeano não se mostrou diferente entre os grupos. Demais fatores, que não exclusivamente o espaço nasofaríngeo e a tonsila faríngea, podem predispor o indivíduo à respiração oronasal ou predominantemente oral e o ortodontista, em sua rotina clínica, pode avaliar objetivamente as particularidades de cada caso e, desta forma, proceder com condutas adequadas o mais precocemente possível.

A PROMOÇÃO DE SAÚDE EM SALA DE AULA NA PERSPECTIVA DE ESTUDANTES UNIVERSITÁRIOS

Essa dissertação de mestrado aborda as temáticas de saúde, promoção de saúde e o lúdico na sala de aula do estudante universitário durante a aprendizagem. O objetivo geral foi verificar a partir do ponto de vista dos universitários a existência da promoção de saúde na sala de aula. Optou-se por um método descritivo e exploratório com emprego de análise de conteúdo. O autor utilizou as entrevistas de 15 alunos dos cursos de pedagogia, direito e administração de empresas de vários semestres dos cursos. Os resultados permitem afirmar que os entrevistados possuem uma percepção acerca dos conceitos de promoção de saúde, sobretudo no que diz respeito à saúde como a conjugação de bem estar e a boa manutenção dos aspectos que configuram a saúde física e mental. Alguns entrevistados afirmaram que o lúdico seria passível de utilização apenas em cursos que visam à formação para a prática docente. A sala de aula pode ser entendida como um espaço de promoção de saúde e disparador dos processos criativos na aprendizagem. Apontou-se também a possibilidade de se manter abertos os canais que possibilitam a melhora da saúde por meio da realização de atividades lúdicas sabendo que essas trazem benefícios não somente no processo de socialização necessário ao enfrentamento das situações cotidianas que permeiam o universo escolar, mas, acima de tudo, na manutenção de um ambiente relacional que pode trazer benefícios em todas as dimensões do convívio escolar.

MANEJO TÉCNICO DO ATENDIMENTO PSICOLÓGICO EM AMBULATÓRIO DE REPRODUÇÃO HUMANA ASSISTIDA

O presente estudo teve por objetivos: descrever o manejo técnico do atendimento psicológico, ilustrado pelo caso de uma paciente infértil de um ambulatório de reprodução humana assistida; descrever as vicissitudes no campo analítico nestes atendimentos; e sistematizar esse manejo técnico em intervenções ambulatoriais em que se privilegia a compreensão das relações transferenciais. O instrumento utilizado para a coleta de dados foram os próprios atendimentos, ou entrevistas psicológicas, baseadas no método clínico de abordagem psicanalítica. A análise e a discussão dos resultados se basearam na apresentação de um único caso, que ilustrou a técnica que se objetivou sistematizar e descrever. É apresentado o caso da Sra. S., uma mulher de 41 anos, com parceiro em união estável há cinco anos, que realizava tratamento de infertilidade no ambulatório de reprodução humana. A paciente foi atendida pela psicóloga no próprio ambulatório durante o período da segunda tentativa de gravidez. Foram realizados efetivamente três (3) atendimentos e, no período de dois meses, a paciente não compareceu a três (3) sessões. Foram criadas cinco (5) categorias de análise: 1) Escuta; 2) Configuração de Queixa Psicológica; 3) Manejo dos Conflitos; 4) Manejo da Transferência; e 5) Enquadre. Estas categorias representaram elementos do atendimento. A divisão do atendimento em categorias teve propósito didático, no entanto, a sistematização do manejo deu-se a partir do desenvolvimento destas categorias, mas não numa ordem pré-estabelecida. A Escuta refere-se à capacidade do psicoterapeuta compreender a relação estabelecida com o paciente, assim como os elementos metapsicológicos depositados no campo, a partir de seu quadro de referência teórico-metodológico. A Configuração de Queixa Psicológica refere-se à aproximação do sofrimento psíquico e dos conflitos que subjazem à queixa orgânica ou manifesta. O Manejo dos Conflitos representa o modo como são interpretados e devolvidos a um paciente os conteúdos trazidos para a sessão. Ressalta-se, no manejo dos conflitos, a eleição de um foco de trabalho em que se privilegia a situação atual da vida do paciente relacionada especificamente à sua queixa. O Manejo da Transferência refere-se à forma como os aspectos transferenciais são compreendidos e devolvidos ao paciente. A neurose e psicose de transferência são evitadas e o trabalho é preferencialmente desenvolvido a partir da interpretação de situações extra-transferenciais. Por fim, o Enquadre engloba todos os aspectos formais e dinâmicos que constituem o campo emocional sobre o qual se trabalha. Este tipo de atendimento pode ser situado entre a entrevista psicológica e o atendimento em psicoterapia breve com objetivos e tempo limitados, variando de acordo com a qualidade adaptativa do paciente e sua motivação para o atendimento psicológico. Concluímos que este modelo de atendimento ambulatorial engloba aspectos tanto diagnósticos quanto de intervenção e que o papel do psicólogo neste contexto é auxiliar o paciente atendido a compreender sua queixa em seus aspectos latentes e manifestos, além de propiciar um espaço de escuta em que os conteúdos trazidos podem ser pensados e compreendidos

An evaluation of task analysis techniques for industrial process control

The concept of a task is fundamental to the discipline of ergonomics. Approaches to the analysis of tasks began in the early 1900's. These approaches have evolved and developed to the present day, when there is a vast array of methods available. Some of these methods are specific to particular contexts or applications, others more general. However, whilst many of these analyses allow tasks to be examined in detail, they do not act as tools to aid the design process or the designer. The present thesis examines the use of task analysis in a process control context, and in particular the use of task analysis to specify operator information and display requirements in such systems. The first part of the thesis examines the theoretical aspect of task analysis and presents a review of the methods, issues and concepts relating to task analysis. A review of over 80 methods of task analysis was carried out to form a basis for the development of a task analysis method to specify operator information requirements in industrial process control contexts. Of the methods reviewed Hierarchical Task Analysis was selected to provide such a basis and developed to meet the criteria outlined for such a method of task analysis. The second section outlines the practical application and evolution of the developed task analysis method. Four case studies were used to examine the method in an empirical context. The case studies represent a range of plant contexts and types, both complex and more simple, batch and continuous and high risk and low risk processes. The theoretical and empirical issues are drawn together and a method developed to provide a task analysis technique to specify operator information requirements and to provide the first stages of a tool to aid the design of VDU displays for process control.

The application of knowledge based expert systems to mechanical engineering design

Investigation of the different approaches used by Expert Systems researchers to solve problems in the domain of Mechanical Design and Expert Systems was carried out. The techniques used for conventional formal logic programming were compared with those used when applying Expert Systems concepts. A literature survey of design processes was also conducted with a view to adopting a suitable model of the design process. A model, comprising a variation on two established ones, was developed and applied to a problem within what are described as class 3 design tasks. The research explored the application of these concepts to Mechanical Engineering Design problems and their implementation on a microcomputer using an Expert System building tool. It was necessary to explore the use of Expert Systems in this manner so as to bridge the gap between their use as a control structure and for detailed analytical design. The former application is well researched into and this thesis discusses the latter. Some Expert System building tools available to the author at the beginning of his work were evaluated specifically for their suitability for Mechanical Engineering design problems. Microsynics was found to be the most suitable on which to implement a design problem because of its simple but powerful Semantic Net Knowledge Representation structure and the ability to use other types of representation schemes. Two major implementations were carried out. The first involved a design program for a Helical compression spring and the second a gearpair system design. Two concepts were proposed in the thesis for the modelling and implementation of design systems involving many equations. The method proposed enables equation manipulation and analysis using a combination of frames, semantic nets and production rules. The use of semantic nets for purposes other than for psychology and natural language interpretation, is quite new and represents one of the major contributions to knowledge by the author. The development of a purpose built shell program for this type of design problems was recommended as an extension of the research. Microsynics may usefully be used as a platform for this development.

Computer aided form roll design

Cold roll forming is an extremely important but little studied sheet metal forming process. In this thesis, the process of cold roll forming is introduced and it is seen that form roll design is central to the cold roll forming process. The conventional design and manufacture of form rolls is discussed and it is observed that surrounding the design process are a number of activities which although peripheral are time consuming and a possible source of error. A CAD/CAM system is described which alleviates many of the problems traditional to form roll design. New techniques for the calculation of strip length and controlling the means of forming bends are detailed. The CAD/CAM system's advantages and limitations are discussed and, whilst the system has numerous significant advantages, its principal limitation can be said to be the need to manufacture form rolls and test them on a mill before a design can be stated satisfactory. A survey of the previous theoretical and experimental analysis of cold roll forming is presented and is found to be limited. By considering the previous work, a method of numerical analysis of the cold roll forming process is proposed based on a minimum energy approach. Parallel to the numerical analysis, a comprehensive range of software has been developed to enhance the designer's visualisation of the effects of his form roll design. A complementary approach to the analysis of form roll design is the generation of form roll design, a method for the partial generation of designs is described. It is suggested that the two approaches should continue in parallel and that the limitation of each approach is knowledge of the cold roll forming process. Hence, an initial experimental investigation of the rolling of channel sections is described. Finally, areas of potential future work are discussed.

Femtosecond laser inscribed superstructure fibre gratings

We demonstrate the development of femtosecond laser inscribed superstructure fiber gratings (fsSFG) in silica optical fibre. We utilise a single step process, to inscribe low loss and polarisation independent, sampled gratings in optical fibres using the point by point femtosecond laser inscription method. Our approach results in a controlled modulated index change with complete suppression of any overlapping LPG structure leading to highly symmetric superstructure spectra, with the grating reflection well within the Fourier design limit. We also solve Maxwell's equations and calculate the back reflection spectrum using the bidirectional beam propagation method (BiBPM). Experimental results validate our numerical analysis and the estimation of inscription parameters such as ac index modulation, wavelength and the relative peak strength. We also explore how changes in the grating's period influence the reflection spectrum.