Academic diss.--Faculty of humanities--Umeå--Umeå university, 1996. / Bibliogr. p. [231]-242. Index.

Transmissivity (T) and Hydraulic apertures are often calculated from hydraulic test data obtained in fractured rock using analytical solutions such as the Thiem and cubic law equations developed for flow through unconsolidated porous media. These analytical solutions use a variety of simplifying assumptions, which are often violated due to the complex nature of flow through fractured rock systems which introduces error into the calculated hydraulic apertures. A 3-D discrete fracture network numerical model (SMOKER) for flow in dual-permeability media was used to simulate constant-head straddle packer tests to assess the errors in fracture characterization that result from deviations from the Thiem and cubic law assumptions caused by permeable rock matrix, variable aperture fractures, and complex flow patterns. The simulations indicate that SMOKER offers potential as a useful tool for representing non-ideal scenarios of rock and fracture network characteristics to assist in estimates and error analysis in T values and resultant errors in hydraulic aperture. / NSERC: Natural Sciences and Engineering Research Council of Canada

Thesis (Ph. D.)--University of Texas at Austin, 2004. / Supervisor: Charlotte Canning. Vita. Includes bibliographical references. Also available from UMI.

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Elastomer seals are used in a variety of industries that require flow isolation. The characterization of the behavior of these seals remains largely unexplored and hence, this study is focused on simulating and validating the axial-compressive behavior of an annular rubber seal constrained concentrically in a pipe. The elastomer material composing the seal, was experimentally characterized for its mechanical, frictional, and viscoelastic properties and modelled using models developed by Yeoh, Thirion, and Prony respectively. A 2D axisymmetric finite-element model was developed using ANSYS 16 and used alongside the material models to simulate an axial load versus displacement curve, a contact pressure distribution, and a pipe hoop strain gradient. The results for quasi-static loading and viscoelastic effects agreed within 7% and 18% of the experimental results, respectively. It was observed that pipe geometry, rubber chemistry, frictional properties, and viscoelastic effects have significant effect on the compressive behavior of the seal. / October 2016

Les milieux aquifères karstiques représentent des ressources en eau importantes, particulièrement sur le pourtour méditerranéen où ils constituent la majorité des réservoirs d'eau douce souterraine. La demande en eau ayant littéralement explosée au cours de ces dernières années, ces ressources en eau constituent un facteur limitant du développement, à l'origine de conflits d'aménagements et d'usages. Il est donc nécessaire d'avoir une meilleure connaissance de ces milieux afin de proposer une exploitation appropriée, répondant aux besoins régionaux. Toutefois, ces milieux restent encore mal connus, notamment à cause de la difficulté à caractériser leur fonctionnement inhérent à l'hétérogénéité organisée de leurs écoulements. Afin d'améliorer la connaissance de ces milieux, nous avons réalisé une étude détaillée des propriétés hydrologiques de l'aquifère karstique du Lez situé en région Nord Montpelliéraine. La source du Lez alimente en eau potable la région par des pompages dans le conduit principal du réseau de drainage. Le bassin (d'une superficie d'environ 200 km²) est équipé d'un réseau dense de piézomètres, ainsi que d'un site expérimental, situé à 4.5 km au nord de la source du Lez concentrant une vingtaine de forage sur une superficie d'environ 1500 m². Ce travail porte à la fois sur 1) une caractérisation multi-échelle de l'hétérogénéité des propriétés hydrodynamiques du système, et 2) une étude du transfert de masse au sein du réservoir via analyse de traçages artificiels réalisés à l'échelle régionale et à l'échelle du site expérimental. Dans un premier temps, les essais en puits seul ont permis caractériser les différents éléments du karst et d'identifier les structures les plus transmissives. A l'échelle du site expérimental, l'analyse de l'essai de pompage a mis en évidence une connectivité globale liée à l'interface stratigraphique et une hiérarchisation des écoulements dépendante de la fracturation verticale. Enfin, l'étude des interférences des pompages du Lez à l'échelle régionale indique une compartimentation hydraulique du système. Les propriétés hydrodynamiques estimées dépendent de l'hétérogénéité structurale et des conditions hydrologiques du bassin. Le recoupement de ces différentes analyses permet une discrétisation des paramètres hydrauliques des composantes structurant les écoulements au sein d'un massif karstique. L'étude du transfert de masse à l'échelle locale et régionale complète cette caractérisation et renseigne les propriétés de transport du réseau karstique. Les essais de traçage à l'échelle du site mettent en évidence la forte hétérogénéité du milieu avec des chemins d'écoulement multiples induisant un gradient de vitesse. Tandis qu'à l'échelle régionale une corrélation des vitesses d'écoulement est observée au sein du réseau de drainage principal.L'ensemble de ces résultats fournit une meilleure connaissance à différentes échelles des propriétés et de la vulnérabilité de ces milieux complexes, constituant une base essentielle pour une modélisation hydrodynamique multi-échelle de ce type d'aquifères. / Characterizing groundwater flows in karst aquifers at different scales of space and time, is not an easy task due to the high level of heterogeneity of these aquifers. Because the limited testing radius of classical hydraulic methods (slug tests, pumping tests), the regional hydraulic parameters of karst systems are generally estimated using the flow recession analysis method. But this integrative method generally does not give a differentiation into regionally varying parameters. Also, it is generally difficult to gather enough data to characterize aquifer heterogeneities at regional scale. For this reason, most of studies about hydrodynamic characterization of karst aquifer focus on local scales, i.e experimental field site scale or borehole scale; measurements at small scale could then be upscaled to obtain hydrodynamic parameters at regional scale. Consequently, understanding scale dependence of groundwater flows organization in such a context is of prime importance for the development of regional scale model.In this study, the monitoring of groundwater flow and transport is performed at several scales of time and space, within a single Mediterranean karstic carbonate aquifer, the Lez karst aquifer, located South of France. Groundwater is intensely pumped in a karst conduit upstream of the main karst outlet (Lez spring), for regional water supply. At regional scale, the relatively dense groundwater monitoring network permits to determine the hydrodynamic properties of the aquifer inferred from the hydrodynamic response to pumping at the Lez spring. At the scale of the experimental field site (Terrieu site), that comprises 22 boreholes, several experiments (i.e. pumping tests, packer tests, slug and injection tests) were performed to determine the hydrodynamic properties at experimental field site scale and borehole scale. Tracer experiments were also performed to provide an estimation of transport properties both at the scale of the experimental field site and at regional scale.The hydrodynamic properties estimated at different scale of space and time (for different hydrological conditions) were compared with flow paths organization linked to the geological structure of the reservoir. At regional scale both the hydrological conditions (i.e. high or low water level) and geological compartmentalization that impact the hydraulic connectivity, control the hydrodynamic properties. Tracer experiments revealed short time transfer and high connectivity between injection points and the spring. At the experimental field site scale, pumping and tracer test highlighted heterogeneous flow pattern that can be linked to the position of boreholes and the main geological features. At borehole scale, hydraulic tests revealed a high range of hydrodynamic properties (transmissivity from 10-11 m²/s to 10-2 m²/s) depending on the investigated part of the aquifer (matrix, fracture or drain).Depending on the water level conditions, the aquifer presents variable organization of flows that modify the hydrodynamic parameters. As expected, variability of hydrodynamic parameters depends on the scale of investigation: a difference of 10 to 105 has been quantified for a same parameter characterized at borehole scale and at regional scale. This hydrogeological parameters quantification of karst system provides important constrain about multiscale modeling using conceptual models to represent the characteristics of the main flow paths.

No description available.

In this thesis I address the research question: 'How has the Internet delivered pluralism by promoting structural diversity and/or content diversity in Australia's newspaper industry?' Structural diversity is defined here as diversity in newspaper ownership and content diversity as the diversity of views published by individual newspapers. Central to the thesis is the notion of pluralism, the belief that the news media should provide a range of views and opinions, contradictory as well as complementary, to allow informed citizens to effectively take part in the democratic process. The newspaper industry in this country, however, is controlled by a powerful press oligopoly across a range of markets, a situation believed to greatly limit pluralism. A review of newspaper ownership and circulation from 1986 to 2002 shows that, as at 2002, four newspaper owners are the sole occupants of Australia's national and capital city newspaper market. Seven owners are predominant in Australia's regional daily newspaper market, although just three owners controlled 69 per cent of the market's circulation in 2002. Two owners controlled 69 per cent of Australia's suburban newspaper market in 2002. Similar trends were seen in the country's Saturday newspaper and Sunday newspaper markets. In all markets except the regional daily newspaper market, News Limited is the dominant newspaper owner. Australian Provincial News and Media is the dominant owner in the regional daily newspaper market with a 27 per cent share of circulation in 2002. Australia's concentrated newspaper ownership structure has led to a number of formal inquiries into diversity in the industry since 1980. In this thesis I review two of these inquiries, the 1991-92 House of Representatives Select Committee on the Print Media (the Print Media Inquiry) and the 2000 Productivity Commission Inquiry into Broadcasting, to determine (among other things) the nature of and the relationship between structural and content diversity as they apply to Australia's newspapers. (By virtue of major media groups' involvement in the Productivity Commission's inquiry - particularly News Limited, Publishing and Broadcasting Limited and, to a lesser extent, Rural Press - this inquiry, although broadcast-oriented, considered Australia's newspaper industry at length.) This review shows both inquiries were clear on how they saw this relationship - structural diversity is necessary for content diversity. However, the Print Media Inquiry suggested it was almost impossible to guarantee structural diversity in the nation's newspaper industry. The Productivity Commission, meanwhile, said that while it accepted content diversity was not inconsistent with media ownership concentration, it was more likely to be achieved where there was diverse ownership. With the relationship between structural and content diversity in mind, and the Print Media Inquiry's and the Productivity Commission's beliefs that new entrants in the newspaper industry were unlikely in the short term, I examine the suggestion that the Internet has the potential to increase structural diversity in Australia's newspaper industry by allowing new players to efficiently enter the industry via the World Wide Web. The extent to which this might occur is determined by a study of 18 Australian newspaper websites with one argument being that if established newspapers find the transition online relatively easy, then independent online-only news sites might be similarly established. Mings and White's four online news business models - a subscription model, advertising model, e commerce-based transactional model and partnership-based model - are used as a framework to examine the study's results. The study shows Australia's experience mirrors international experience in terms of the growth of newspapers online and in terms of their lack of profitability. It shows that 28 per cent of the newspapers surveyed maintained their circulation while offering free online news content, while a further 33 per cent registered circulation increases. Advertising revenue increased for seven of the nine newspaper websites containing advertising, suggesting that, for some Australian newspapers at least, gaining online advertising (as opposed to gaining overall profitability) has proved successful. And while the survey shows little evidence of Australian newspapers using the transactional model in any real sense, it does show that Australian newspapers are forming local online partnerships with other media and non-media businesses to facilitate their online activities. The study's key finding is that of the 18 newspapers surveyed, just two websites were profitable. This finding is consistent with literature that highlights a lack of commercially viable independent online news ventures both in Australia and internationally. While considerable hopes were held that the Internet would introduce more structural diversity into Australia's newspaper industry, I argue that the Internet's commercial imperatives, as they apply to newspapers, have to a large extent precluded it from adding structural diversity in the industry. In these circumstances, it may be that the only viable way of increasing content diversity in the nation's newspaper industry is to increase the availability of diverse information sources to journalists. I propose that one way to do this is via the Internet. The extent to which this is occurring is determined by a survey of Australian journalists' Internet use, the survey results showing that 97.4 per cent of the journalists who responded now use the Internet regularly, including 97.5 per cent of newspaper journalists. But most journalists who responded use the Internet as a preliminary research tool and as a way to check facts rather than as a means of accessing diverse news sources. The respondents' top five Internet uses, for example, are to e-mail work colleagues, to undertake preliminary research, to access media releases from websites, to verify facts and to search other news organisations' websites. They access major news organisation websites most frequently, followed by government websites, university/research institution websites and corporate/company websites. The least frequently accessed websites are those that could conceivably provide the alternate views demanded by pluralism: online news and current affairs discussion groups and websites set up by private individuals. The survey shows the types of websites Australian journalists most frequently access are linked to the credibility they give to information contained on those websites. Major news organisation websites are seen as providing the most credible information, followed by university/research institution websites and government websites. Websites perceived as providing the least credible information were those that host online news and current affairs discussion groups and websites set up by private individuals. The survey also shows Australian journalists have not embraced online reader interaction to any extent, lessening the likelihood that readers will be able to provide journalists with more diverse news sources. Less than 20 per cent of journalists interact with readers via the Internet and less than 10 per cent use this interaction to create or follow up news stories. The survey does provide results that support source diversity, however. It shows that almost a third of Australian journalists have obtained additional news sources via the Internet. The Internet has also allowed more than 40 per cent of journalists to access individuals or groups that they would not otherwise have accessed. The survey also shows that journalists who have had experience working in the online media environment consistently use the Internet more productively, in terms of diversity, than other journalists. It is these journalists that interact online with readers more, that participate in online discussion groups more and that appear more willing to seek online information from non-traditional sources such as independent news websites and the websites of private individuals or groups. Journalists with online media experience also represent the group that has most sought training in online journalism and online media practice and that most believes the Internet will play an increasingly important role for journalists and news consumers in the future. At present, the survey suggests, journalists with this online media experience comprise just 19 per cent of Australian journalists. But as the number of journalists with online media experience increases in the workforce, these journalists' greater acceptance of the Internet may then assist in greater source diversity leading to greater content diversity in Australia's news media. The studies of newspaper websites and journalists' Internet use suggest and support differing diversity models. In this thesis I propose two models for diversity, the first drawn from views espoused by the Print Media Inquiry and the Productivity Commission's Inquiry into Broadcasting. This model (below) sees a one-to-one correspondence between structural and content diversity and assumes that to increase the diversity of views available to the public, the number of media outlets must similarly be increased. The argument that the Internet can provide media pluralism by permitting new players to enter the media market relatively easily, an argument tested by my study of Australian newspaper websites, is commensurate with this model. The second model is based on my inquiries into journalists' Internet use and proposes a method of increasing content diversity within a fixed media ownership structure. This model (below) acknowledges that journalists produce content mostly via traditional news sources, but proposes this content can be increased and/or changed, with an emphasis on more diverse information, via non-traditional news sources obtained via the Internet. The success of this model, however, is predicated on journalists' acceptance of online information as a viable news source. The implication for journalism is that established journalistic norms and practices, which can limit online-supported content diversity, need to be overcome. Overall, the results of my inquiries suggest the answer to the research question is that the Internet has so far delivered little in terms of structural and content diversity in Australia's newspaper industry. However, the Internet's potential to do so remains, particularly if independent online-based media ventures find ways to become commercially viable and if journalists adopt the technology as a means of finding more diverse news sources.

This thesis deals with the creation of the intro with limited size. This work describes methods for reducing the size of the final application. The main part describes methods for generating graphic content and methods for its animation. It deals with creation of textures and geometry. Another part is aimed on the physical simulation of particle and elastic systems.

This thesis examines the missiological writings of Orlando E. Costas (1943-1987), particularly The Church and Its Mission: A Shattering Critique from the Third World (1974); Theology of the Crossroads in Contemporary Latin America (1976); Christ Outside the Gate (1982); and Liberating News: A Theology of Contextual Evangelization (1989). From the early 1970s until his death in 1987 he wrote over 130 articles and 12 books in both Spanish and English that addressed key missiological concerns. A careful reading of a selection of Costas's texts oriented around a hymn, a gospel song, a psalm, and a poem provides the shape of this thesis. This thesis argues that Costas formulated a Third World evangelical missiology. Chapter one investigates what Costas's autobiographical material expressed about his positions on conversion, Protestant evangelicalism, missiology, and those living on the ‘periphery' of life. Chapter two recognises his commitment to the peoples of Latin America and the Caribbean in particular and the Third World in general. Chapter three explores Costas's analysis of the Latin American Protestant Church in a revolutionary situation in the continent and chapter four examines his survey and critical appraisal of Latin American liberation theology. Chapter five recognizes the pastoral shape of Costas's missiology. Chapter six explores his critical interaction with two more conservative evangelical missiological positions, the Church Growth Movement and Peter Beyerhaus and the Frankfurt Declaration, and chapter seven surveys the discussion within the international evangelical community regarding the relationship between evangelism and social responsibility. Chapter eight examines Costas's Liberating News as an expression of Third World evangelical missiology. Chapter nine considers the theological issue of penal substitutionary atonement and his missiology. The thesis concludes with an appraisal of the issues and contributions of Costas's Third World evangelical missiology to current missiological discussion.