Influencing students' construction of personalised concept maps through the use of query expansion (QE) searching of the World Wide Web

Despite the on-going development of search engines, users of the World Wide Web, including school and undergraduate students, still find searching for appropriate information problematic. Keener students may seek relevant information to help them to construct a better understanding of the various concepts within a taught subject. Unfortunately there is no guarantee that the information contained in the located documents is of sufficient educational quality; measured for example in terms of the information's usefulness, accuracy, relevancy, trustworthiness, level of language, completeness and status. In this research it is argued that a domain expert (perhaps in the form of a "web literate" subject tutor) has several major advantages over a school or undergraduate student when it comes to searching for relevant subject-related informatio

The use of embedded sensors for the monitoring of adhesive joints in marine environments

A copolymer incorporating polyaniline was used as a sensing medium in the construction of a resistance based humidity sensor. Aniline monomer was polymerised in the presence of poly (butyl acrylate / vinyl acetate) and a copolymer containing polyaniline emeraldine salt was obtained. The sensing medium was then developed by redissolving 1-2 w/w% of the resulting polymer residue in dichloromethane to produce a processable polymer blend solution. Some of this polymer residue was also de-doped in a solution of ammonia, and then washed with distilled water until the waste water had a neutral pH. This residue was then redissolved at 1-2 w/w% in dichloromethane to produce a second processable polymer blend this time containing polyaniline emeraldine base. The final sensor design utilised 125μm polyester insulated platinum wire as conducting electrodes that were dip coated in the emeraldine salt copolymer solution and allowed to dry in a desiccator. The sensor was then dip-coated in a protective barrier layer of the emeraldine base copolymer to prevent over-oxidation and/or de-protonation of the emeraldine salt sensing medium under this coating. The sensors had an overall final thickness of less than 150μm and showed high sensitivity to humidity, low resistance, and good reversibility without hysteresis. Sensors were monitored for 2-probe resistance changes when in contact with water. Calibration curves for each sensor were produced to convert the resistance reading to mass uptake of water. Individual sensors were embedded within Aluminium 5083 / Araldite 2015 adhesive joints to monitor mass uptake of water when exposed to marine environments. Correlations between mass uptake of water and joint strength were made. There are various advantages of such a sensor design. Polymer based thin film humidity sensors have the advantage that the high processability of the material allows for simple fabrication of a range of geometries including smaller sensor designs. The ease of processing gives a low cost sensor, whilst the small size and good mechanical properties gives a robust sensor which has the flexibility to be able to be used in applications where dynamic stresses and strains are encountered. Such sensors may find uses in a number of areas including electronic textiles, food/ electronics packaging and corrosion detection

Tri-layer polymer actuators with variable dimensions

The ability of conducting polymer actuators to convert electrical energy into mechanical energy is influenced by manyfactors ranging from the actuators physical dimensions to the chemical structure of the conducting polymer. In order toutilise these actuators to their full potential, it is necessary to explore and quantify the effect of such factors on theoverall actuator performance. The aim of this study is to investigate the effect of various geometrical characteristics suchas the actuator width and thickness on the performance of tri-layer polypyrrole (PPy) actuators operating in air, asopposed to their predecessors operating in an appropriate electrolyte. For a constant actuator length, the influence of theactuator width is examined for a uniform thickness geometry. Following this study, the influence of a varied thicknessgeometry is examined for the optimised actuator width. The performance of the actuators is quantified by examination ofthe force output, tip displacement, efficiency as a function of electrical power and mechanical power, and time constantfor each actuator geometry. It was found that a width of 4mm gave the greatest overall performance without curlingalong the actuator length (which occurred with widths above 4mm). This curling phenomenon increased the rigidity ofthe actuator, significantly lowering the displacement for low loads. Furthermore, it was discovered that by focussing ahigher thickness of PPy material in certain regions of the actuators length, greater performances in various domainscould be achieved. The experimental results obtained set the foundation for us to synthesize PPy actuators with anoptimised geometry, allowing their performance to reach full potential for many cutting applications

Electrochemical AFM : understanding the electromaterial-cellular interface

Organic conducting polymers are emerging as an exciting new class of biomaterial that can be used to enhance and control the growth of mammalian cells for tissue regeneration and engineering application

Influencing students' construction of personalised concept maps through the use of query expansion (QE) searching of the World Wide Web

Despite the on-going development of search engines, users of the World Wide Web, including school and undergraduate students, still find searching for appropriate information problematic. Keener students may seek relevant information to help them to construct a better understanding of the various concepts within a taught subject. Unfortunately there is no guarantee that the information contained in the located documents is of sufficient educational quality; measured for example in terms of the information's usefulness, accuracy, relevancy, trustworthiness, level of language, completeness and status. In this research it is argued that a domain expert (perhaps in the form of a "web literate" subject tutor) has several major advantages over a school or undergraduate student when it comes to searching for relevant subject-related informatio

Wireless aquatic navigator for detection and analysis (WANDA)

The cost of monitoring and detecting pollutants in natural waters is of major concern. Current and forthcoming bodies of legislation will continue to drive demand for spatial and selective monitoring of our environment, as the focus increasingly moves towards effective enforcement of legislation through detection of events, and unambiguous identification of perpetrators. However, these monitoring demands are not being met due to the infrastructure and maintenance costs of conventional sensing models. Advanced autonomous platforms capable of performing complex analytical measurements at remote locations still require individual power, wireless communication, processor and electronic transducer units, along with regular maintenance visits. Hence the cost base for these systems is prohibitively high, and the spatial density and frequency of measurements are insufficient to meet requirements. In this paper we present a more cost effective approach for water quality monitoring using a low cost mobile sensing/communications platform together with very low cost stand-alone ‘satellite’ indicator stations that have an integrated colorimetric sensing material. The mobile platform is equipped with a wireless video camera that is used to interrogate each station to harvest information about the water quality. In simulation experiments, the first cycle of measurements is carried out to identify a ‘normal’ condition followed by a second cycle during which the platform successfully detected and communicated the presence of a chemical contaminant that had been localised at one of the satellite stations

A qualitative exploration of school-based staff's experiences of delivering an alcohol screening and brief intervention in the high school setting: findings from the SIPS JR-HIGH trial.

Background: Whilst underage drinking in the UK has been declining in recent years, prevalence is still higher than in most other Western European countries. Therefore, it is important to deliver effective interventions to reduce risk of harm. Methods: Semi-structured interviews with staff delivering an alcohol screening and brief intervention in the high-school setting. The analysis was informed by normalization process theory (NPT), interviews were open coded and then a framework applied based on the four components of NPT. Results: Five major themes emerged from the analysis. The majority of participants felt that the intervention could be useful, and that learning mentors were ideally suited to deliver it. However, there was a feeling that the intervention should have been targeted at young people who drink the most. Conclusions: The intervention was generally well received in schools and seen as an effective tool for engaging young people in a discussion around alcohol. However, in the future schools need to consider the level of staffing in place to deliver the intervention. Furthermore, the intervention could focus more on the long-term risks of initiating alcohol consumption at a young age

Randomized Trial of Four Financial-Incentive Programs for Smoking Cessation

Background Financial incentives promote many health behaviors, but effective ways to deliver health incentives remain uncertain. Methods We randomly assigned CVS Caremark employees and their relatives and friends to one of four incentive programs or to usual care for smoking cessation. Two of the incentive programs targeted individuals, and two targeted groups of six participants. One of the individual-oriented programs and one of the group-oriented programs entailed rewards of approximately $800 for smoking cessation; the others entailed refundable deposits of$150 plus $650 in reward payments for successful participants. Usual care included informational resources and free smoking-cessation aids. Results Overall, 2538 participants were enrolled. Of those assigned to reward-based programs, 90.0% accepted this assignment, as compared with 13.7% of those assigned to deposit-based programs (P Conclusions Reward-based programs were much more commonly accepted than deposit-based programs, leading to higher rates of sustained abstinence from smoking. Group-oriented incentive programs were no more effective than individual-oriented programs

A New Image Analysis Based Method for Measuring Electrospun Nanofiber Diameter

In this paper, a new image analysis based method for electrospun nanofiber diameter measurement has been presented. The method was tested by a simulated image with known characteristics and a real web. Mean (M) and standard deviation (STD) of fiber diameter obtained using this method for the simulated image were 15.02 and 4.80 pixels respectively, compared to the true values of 15.35 and 4.47 pixels. For the real web, applying the method resulted in M and STD of 324 and 50.4 nm which are extremely close to the values of 319 and 42 nm obtained using manual method. The results show that this approach is successful in making fast, accurate automated measurements of electrospun fiber diameters

Ultranationalism, democracy and the law: insights from Côte d'Ivoire

Although much has been written about the ideology of Laurent Gbagbo's Front Populaire Ivoirien in Côte d'Ivoire and its impact on the Ivorian politico-military crisis, little attention has been paid to the ubiquitous role of the law in the discourse and political strategy of the pro-Gbagbo elite. The Ivorian case may provide important insights about the connection between ultranationalist ideology and a legalist, formalist conception of democracy and national sovereignty. The article analyses the circumstances of the emergence of ‘legalist nationalism’ in Côte d'Ivoire by looking at key episodes of the Ivorian transition between 2002 and 2012. The article discusses the relevance of Pierre Englebert's concept of ‘legal command’ and the turbulences of democratic transitions in accounting for the prominence of legalism in Ivorian politics. It explores the implications of the Ivorian case for understanding the connection between law and politics in Africa