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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

Dynamics of rotor systems embodying high pressure ring seals

Jenssen, Dag N. January 1970 (has links)
No description available.

Non-linear analysis of reinforced concrete members

Waagaard, Knut January 1974 (has links)
No description available.

Novel polymeric materials for electrochemical cells

Gilby, S. J. January 2010 (has links)
No description available.

Conductive carbon nanotube thermosetting polyester nanocomposites

Battisti, Andrea January 2009 (has links)
A commercial unsaturated polyester resin has been used in combination with commercial multiwalled carbon nanotubes (MWNTs) to study the effects of this nanofiller on the electrical properties of the mix in the liquid state, during the cure and in the solid state. The level of addition of the nanotubes ranged from 0.05 to 0.3 wt%. The dispersion of the filler particles in the matrix was carried out combining triple roll milling, horn sonication and high shear mixing. Qualitative optical and electronic microscopy characterisation supports the development of novel techniques for real-time quantitative assessments of dispersion quality. Fitting of shear dependent viscosity, measured between 0.1 and 100 s-1, to Carreau's model has been shown to provide an indicator of the state of nanotube dispersion in the mixture. Additionally, liquid electrical conductivity measurements offer the option of on-line monitoring, providing a promising tool for process optimisation. The formation of an effective conductive network of nanotubes during the cure was investigated by combining impedance spectroscopy measurements and equivalent circuit modelling with two parallel RC circuit in series with each other. This allows in-situ observation of the key phenomenon responsible for the electrical conductivity of the nanocomposite, namely the filler re-aggregation during cure. Optimisation of dispersion and cure parameters results in a nanocomposite showing conductive behaviour in the solid state, achieving DC conductivity of 0.13 S/m at 0.30 wt% loading. The percolation threshold was estimated to occur at 0.026 wt% filler loading. The conductivity achieved is comparable to state-ofthe-art epoxy thermosetting nanocomposites based on use of carbon nanotubes of equivalent quality. Successful laboratory scale trials demonstrated the suitability of the materials in copper electroplating and resistance heating. An industrial scale up trial of a 40 kg batch was carried out, using the dispersion and the monitoring techniques developed in the study.

Non-equilibrium flashing flow in the bubbly regime

Herries, Gilbert January 1968 (has links)
No description available.

The design and analysis of gas distribution networks

Boyne, Grahame Gowans January 1970 (has links)
No description available.

Process scale dependence of L-glutamic acid batch crystallised from aqueous solution in relation to reactor internals, reactant mixing and process conditions

Liang, Jessica Kangping January 2002 (has links)
No description available.

Characterisation of Commercial Flax Fibre Supplies and Development of an Enzyme-Based Treatment Process For Flaz Fibre

Kernaghan, K. J. January 2008 (has links)
No description available.

Investigating information trust, professional ethics and risk when embracing e-government : an empirical study of Kingdom of Saudi Arabia (KSA)

Alammar, Saad January 2016 (has links)
In an attempt to establish more efficient and transparent governmental services, manual systems of government across the globe are being transferred to e-government systems, including the Kingdom of Saudi Arabia (KSA). However, this transformation, and especially ensuring user acceptance of e-government, poses a number of challenges. Against this backdrop, the current work examines issues that are related to information trust, professional ethics, and the risks incurred in embracing an e-government. This was carried out based on three Saudi Arabian organisations namely the Ministry of Interior; the Ministry of Communication and Information Technology; and King Abdul-Aziz City for Science and Technology. Qualitative methods was adopted for both data collection and analysis based on semi-structured interviews and questionnaires. The data were analysed using thematic analysis to establish perceptions and behavioural patterns of e-government systems among both government officials and general users. A technological gap was identified as the core impediment to widespread implementation and user acceptance of e-government in KSA. It was established that governmental success in ensuring the system is resilient against data loss and hacking, and habitual adoption of checking mechanisms, can lead towards improved implementation of e-government, along with its utilisation throughout KSA. This research contributes a research model, informed by institutional theory, of factors affecting the adoption of e-government from both employees and citizens’ perspectives (as evident within KSA). It responds to calls from other Information Systems researchers to study e-government by conducting an in-depth field investigation using qualitative research. In doing so, it addresses issues related to information trust, professional ethics and risk in e-government implementation.

Can environmental citizenship be enhanced through social media? : a case study of engagement in a UK university

Pianosi, Monica January 2017 (has links)
The research presented in this thesis focuses around the question: “can social media tools be used effectively to foster a participatory process that increases environmental citizenship and promote pro-environmental behaviour-change?”. The research aims to understand the role of staff and students in the socio-technical system that influences an institution’s environmental impact. Users need not to be educated, but empowered in order to be able to take decisions that would reduce the environmental impact of their institutions. Therefore a participatory process is suggested as the right tool to nurture environmental citizens, who will be able to take ‘right’ and ‘good’ decisions about their pro-environmental actions. In the last years, social media have emerged as a worldwide phenomenon. But alongside the grand claims of a social media inspired ‘revolution’ lie more nuanced questions around the role of digital tools in ‘every day’ contexts, and whether or not they are facilitating a cultural change or merely adding to the noise of modern life. The thesis contributes to the debate through presenting findings from an action research study at an East Midlands University in which a case study approach was implemented to explore the potentialities offered by participating in decision-making regarding pro-environmental issues in the institutional context, as they are mediated by social media. To generate behaviour-change the two correlated theories of public engagement and environmental citizenship were tested. Findings indicate that behaviour change and enhanced environmental citizenship are achievable through participation using social media, as several interviewees reported a change or a reinforcement of already existing pro-environmental behaviours as a consequence of the campaign. However, the reported changes were minor and it is difficult to advocate that they could noticeably contribute to the requested reduction targets on carbon emission from behaviour-change of the HE sector.

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