Informing students using virtual microscopes and their impact on students' approach to learning

This research is an exploratory study of students ’ approaches to studying histology and pathology. With the introduction of virtual microscopes in Health Science at Murdoch University, Australia, in 2006, it was crucial to investigate how this new technology impacted on students ’ approaches to learning. The ASSIST survey was implemented at the beginning and end of the semester to identify any changes. Results indicate that, when the technology was integrated into the curriculum with appropriate learning activities, students using virtual microscopes moved more towards a strategic approach to learning but expressed a preference for a deep approach to teaching

Ultrasonic characterisation of wheel hub/axle interference fit pressures

Railway wheels are secured onto the axle by means of an interference fit. The wheel is press fitted onto a pre-lubricated axle, and the resulting interference fit induces a contact pressure at the interface. Occasionally railway wheels fail by fatigue, with the initiation point for the failure frequently traced to the interference fit. The aim of this work is to use ultrasonic reflection to non-destructively determine contact conditions in the interference fit. The rough surface contact at the interference fit interface behaves like a spring. If the contact pressure is high the interface is conformal with few air gaps, the stiffness is then high and the transmission of an ultrasonic wave is permitted. However, when pressure is low more air gaps exist, interfacial stiffness is then reduced and more of the ultrasound is reflected. Normalised contact pressure was determined from this stiffness. Maps of the interface have been produced which show the contact pressure to peak at the edges of the fit, and to experience a continuous variation about a mean value elsewhere

When the Shoe is on the Other Foot: Experimental Evidence on Valuation Disparities

The method of elicitation has an important effect on valuations. We investigate the effect of perspective on decision makersâ?? elicited values. We conduct experimental sessions in which participants act as sellers or buyers and replicate the disparity between willingness to accept and willingness to pay: sellers want to collect more and buyers want to pay less. We conduct additional sessions in which endowed decision makers provide values that are used to determine a price at which anonymous others transact. In these sessions, decision makersâ?? experimental earnings are not affected by valuations, but rather determined by their endowment. Decision makers appear to consider their standing relative to anonymous others in providing valuations, i.e., decision makersâ?? endowments affect their valuations. The results indicate that the disparity between willingness to accept and willingness to pay disappears when decision makersâ?? endowment ensures that they are at least as well off as anonymous others.

Increasing Beach Recreation Benefits by Using Wetlands to Reduce Contamination

The public swimming beach at Maumee Bay State Park (MBSP) on Lake Erie is often posted for occurrences of unsafe levels of bacteria. The main source of bacteria derives from a drainage ditch that discharges near the beach. We have conducted a comprehensive study to determine the feasibility of using a constructed wetland to filter the ditch water, prior to its entry into Maumee Bay. As part of this study, we administered an on-site non-market valuation survey of beach visitors, in which observed and contingent trips to the beach were used to estimate the potential welfare benefits of the restored wetlands. The data were analyzed using three versions of the multivariate Poisson-lognormal (MPLN) model, a random effects count data model. We conclude version one, with flexible covariance structure and vehicle costs of $0.25 per mile, is the preferred version and use it to estimate an average annual willingness to pay (WTP) of$166 to construct wetlands and improve water quality. The aggregate annual benefit to an estimated 37,300 annual beach visitors is estimated as $6.19 million. The robustness of this estimate to a variety of alternative assumptions is examined.Count data model, Poisson lognormal, on-site sampling, recreation demand, wetland, simulated maximum likelihood, Community/Rural/Urban Development, Environmental Economics and Policy, Public Economics, Q51,

Drawing Graphs within Restricted Area

We study the problem of selecting a maximum-weight subgraph of a given graph such that the subgraph can be drawn within a prescribed drawing area subject to given non-uniform vertex sizes. We develop and analyze heuristics both for the general (undirected) case and for the use case of (directed) calculation graphs which are used to analyze the typical mistakes that high school students make when transforming mathematical expressions in the process of calculating, for example, sums of fractions

When the shoe is on the other foot: experimental evidence on evaluation disparities

Research provides evidence that the method chosen to elicit value has an important effect on a person’s valuation. We hypothesize that role has a crucial effect on decision makers’ elicited values: Buyers prefer to pay less and sellers prefer to collect more. We conduct experimental sessions and replicate the disparity between willingness to pay and willingness to accept. We conduct additional sessions in which role is stripped away: Endowed decision makers provide values that are used to determine a price at which anonymous others transact. Importantly, decision makers’ earnings in the experiment are not affected by the elicited values, but the endowments influence decision makers’ valuations. Our findings suggest that decision makers consider their relative standing, in comparison to anonymous others, in providing valuations. The disparity between willingness to pay and willingness to accept disappears when decision makers’ endowments ensure that they are at least as well off as other participants.

Integrating Dynamics and Wear Modelling to Predict Railway Wheel Profile Evolution

The aim of the work described was to predict wheel profile evolution by integrating multi-body dynamics simulations of a wheelset with a wear model. The wear modelling approach is based on a wear index commonly used in rail wear predictions. This assumes wear is proportional to Tγ, where T is tractive force and γ is slip at the wheel/rail interface. Twin disc testing of rail and wheel materials was carried out to generate wear coefficients for use in the model. The modelling code is interfaced with ADAMS/Rail, which produces multi-body dynamics simulations of a railway wheelset and contact conditions at the wheel/rail interface. Simplified theory of rolling contact is used to discretise the contact patches produced by ADAMS/Rail and calculate traction and slip within each. The wear model combines the simplified theory of rolling contact, ADAMS/Rail output and the wear coefficients to predict the wear and hence the change of wheel profile for given track layouts

Rupture: Exposing the Instability of a State Apparatus Through Poetic Descriptions of a Natural World

The thesis uses the critical lens of Deleuze and Guattari on the poetry of George Gordon Byron, Samuel Taylor Coleridge, and Bobby Sands to illustrate the way natural elements deconstruct the power of a state apparatus by exposing it as a temporary social construct. I argue that literature creates the idea of a nation by perpetuating narratives that divide the world into borders; conversely, literature can dissolve political boundaries into natural elements beneath borders through the cultivation of desire towards wild spaces. By positioning the locus of control beneath the social construct performing on its surface, poets destabilize the state apparatus's desire to quantify, contain, and striate the world unopposed; thus, ecocentric poetry exposes lines of flight beyond confinement that would otherwise subjugate individuals into homogenous classifications. The three chapters are founded upon Deleuze and Guattari’s binary terms of smooth vs striated space to organize territorialization. Ultimately the conclusion is that smooth and striated space are not fixed in existence but perceptual, and thus a text has power to construct a subject’s interpretation of the world

Dietary flavonoid intakes and CVD incidence in the Framingham Offspring Cohort

This study examines the relationship between long-term intake of six flavonoid classes and incidence of CVD and CHD, using a comprehensive flavonoid database and repeated measures of intake, while accounting for possible confounding by components of a healthy dietary pattern. Flavonoid intakes were assessed using a FFQ among the Framingham Offspring Cohort at baseline and three times during follow-up. Cox proportional hazards regression was used to characterise prospective associations between the natural logarithms of flavonoid intakes and CVD incidence using a time-dependent approach, in which intake data were updated at each examination to represent average intakes from previous examinations. Mean baseline age was 54 years, and 45 % of the population was male. Over an average 14·9 years of follow-up among 2880 participants, there were 518 CVD events and 261 CHD events. After multivariable adjustment, only flavonol intake was significantly associated with lower risk of CVD incidence (hazard ratios (HR) per 2·5-fold flavonol increase = 0·86, Ptrend = 0·05). Additional adjustment for total fruit and vegetable intake and overall diet quality attenuated this observation (HR = 0·89, Ptrend = 0·20 and HR = 0·92, Ptrend = 0·33, respectively). There were no significant associations between flavonoids and CHD incidence after multivariable adjustment. Our findings suggest that the observed association between flavonol intake and CVD risk may be a consequence of better overall diet. However, the strength of this non-significant association was also consistent with relative risks observed in previous meta-analyses, and therefore a modest benefit of flavonol intake on CVD risk cannot be ruled out

Improved local planning for reservoir-oriented recreation opportunities

Water-based recreation is becoming an increasingly important aspect of water-resources management. However, there is a great deal of uncertainty about its local socio-economic impact. This uncertainty has played a key role in debates over the construction of reservoirs in Illinois. While much attention has been given to predicting expected impacts of reservoirs, there has been little investigation of the actual impacts, and very little attention has been given to evaluating the effectiveness of various approaches to dealing with those local impacts that do indeed result from water-resources-management projects. This study looks at the actual recreation-induced local impacts of Lake Shelbyville, a multipurpose reservoir constructed by the U. S. Army Corps of Engineers in central Illinois. The reservoir began filling in 1969 and is a major recreation attraction (three million visitor days annually) in a predominately agricultural region. The study is exploratory. It identifies significant impacts and suggests how these impacts may be predicted and dealt with. Significant attention is given to impacts on local government costs and revenues as well as needed intergovernmental cooperation. It is clear that local impacts were significantly different from what was expected and that local residents and recreationists using the lake could benefit from improvements in local planning and intergovernmental cooperation.U.S. Department of the InteriorU.S. Geological SurveyOpe