Giant bone island of femur. Case report, literature review, and its distinction from low grade osteosarcoma

A 42-year old male with the largest reported giant bone island (10.5 cm in length) is presented. Due to its ominous size, association with some degree of pain and increased uptake on radionuclide bone scan, a biopsy was considered necessary definitively to rule out a slow-growing osteosarcoma or blastic metastasis. Documentation of growth in adult patients of conventional and giant bone islands, coupled with evidence of increased radionuclide uptake, makes the clinicoradiological distinction between bone islands and blastic malignancies difficult. Guidelines for biopsy versus serial radiographic follow-up of such lesions are addressed.     

Art,Work and Art Work

This paper introduces a novel method for investigating the interfaces between art work and managerial work in the creative industries. The method, which we are calling dispraxis, seeks to transcend the traditional divisions between the academic world and the world of practice. This particular dispraxis is a structured, iterative dialogue between an academic, a manager, and an artist on the themes identified in the call for papers. In this dispraxis the following four themes were elicited. The first theme centred on the explosion of management discourse into the creative industries. The second theme explored the difference between the creative industries and ‘normal’ business and introduced the metaphor of chelation to describe the primary need to manage and protect safe spaces for creativity to happen. The third theme was money and this theme explored how art is valued and funded, especially in a postmodern world where the notion of authenticity and Taste have been problematised. The fourth theme discussed how art is routinely identified as the highest expression of human achievement and yet is largely ignored in commercial discourse. One explanation for this is to consider artistic work as part of the abject. The metaphor of origami is used to gather together the various themes explored in the dispraxis.     

On exact unsteady navier-stokes solutions

Exact “universal” unsteady rotational flow solutions are compared to an earlier class of exact unsteady flows. They apply to different flow situations.     

Supervised hours requirements in graduated driver licensing: Effectiveness and parental awareness

Most states require teens to complete a certain number of hours of supervised driving practice to obtain a license to drive unsupervised. Although widely implemented, the effect of requiring supervised practice is largely unknown. Using auto-regressive integrated moving average (ARIMA) interrupted time-series analysis, we found no change in fatal and injury crash involvement of 16–17-year-old drivers in Minnesota following enactment of a 30 h supervised driving requirement. To supplement and provide insight into these findings, we conducted telephone interviews with parents of newly licensed teenage drivers in five states with varying amounts of required supervised driving, including Minnesota. Interviews revealed awareness of supervised driving requirements was limited. Only a third of parents (32%) overall could correctly identify the number of hours their state required. In Minnesota only 15% of parents could identify the amount of supervised driving their teen was required to complete. Awareness of the number of hours required was substantially higher (55%) in Maryland. Unlike the other states, Maryland requires submission of a driving log detailing the hours of supervised driving. The findings suggest states need to develop more effective mechanisms to ensure parents are aware of supervised hours requirements.     

Recent progress in the use of in situ X-ray methods for the study of heterogeneous catalysts in packed-bed capillary reactors

Synchrotron-based X-ray techniques, such as Diffraction and Absorption Spectroscopy (XAS), can be readily employed to study catalysts in action, thereby offering great potential for revealing the mechanism and behaviour of catalytic solids both during preparation and reaction. The continued advancement of X-ray generation and collection mean that it is now possible to obtain high quality data from catalysts under reaction conditions with second/sub-second time resolution. In this paper, we describe in detail a specific setup which can be used to obtain transmission in situ data. It is able to mimic industrial preparation/reaction environments and has been developed to such an extent that such measurements are now routine. To illustrate its applicability, we present time-resolved diffraction data obtained from an iron molybdate-based catalyst under pseudo industrial operating conditions revealing its bulk solid-state chemistry and stability, and further show how the catalyst behaviour changes as a function of the Fe/Mo ratio. We also illustrate the versatility of this setup in obtaining data using simultaneous multiple techniques (including non-X-ray-based methods, e.g. UV–vis) from an iron molybdate catalyst under methanol/air-flow. We conclude with a brief outlook towards the future, in which we identify new possibilities for studying catalysts in action which could yield insight into their preparation and behaviour.     

Interferometric study of concentration profiles in solutions near membrane surfaces

A new technique for the observation and interpretation of concentration profiles in diffusion layers at membrane-solution interfaces was developed. The concentration profiles in dilute (0·01N) KCl solutions near an ion-exchange membrane were observed in a modified O'Brien-type wedge laser interferometer while electric current (1·15 and 2·3 mA cm^?2) passed through the solution (25°C). After current reversal, following prepolarization periods of 5–60 s, a concentration minimum develops. The image of this minimum in relation to the membrane surface is not subject to optical deflection and can therefore be accurately determined. From its trajectory, the salt concentration at the membrane surface at the time of current reversal was determined. It was found that as this concentration dropped to the order of 10^?3–10^?4M (“critical concentration”) significant deviations occurred between observed trajectories and those computed from a theory based on the Nernst-Planck equations. These deviations are believed to be caused by substantial migration of H⁺ and OH^?. While these measurements indicate the order of magnitude of the critical concentration, additional measurements are necessary for quantitative determination of this concentration under different physicochemical and hydrodynamic conditions.     

The Decomposition equilibria of platinum di- and mono-chlorides by the simultaneous torque-knudsen technique

The decomposition equilibria of platinum dichloride have been found to consist of two decomposition steps, with chlorine molecules being the vapor species for both steps. An intermediate metastable PtCl solid is formed in the first step in addition to platinum metal and chlorine molecules. The platinum dichloride decomposes incongruently, the stepwise decomposition being PtCl₂ → PtCl → Pt. The PtCl₂ decomposition reactions consist of PtCl₂(s) = PtCl (metastables) + 1/2 Cl₂ (g) and PtCl₂(s) = Pt(s) + Cl₂ (g). The sum of the third lawΔH _{D, 298} K for the above two reactions is 214.637 ± 1.963 kJ/mole, in very good agreement with the second law ΔH_{D, 298 K} = 215.107 ± 13.062 kJ/mole. The second decomposition step is given by the reaction 2PtCl (metastables) = 2Pt(s) + Cl₂ (g) with a third law ΔH_{D, 298 K} = 127.356 ± 0.791 kJ/mole, in excellent agreement with the second law ΔH_{D, 298 K} = 127.509 ± 6.154 kJ/mole. The calculated heat of formation of PtCl₂ is -139 ± 2 kJ/mole and that of PtCl is -63 ± 1 kJ/mole. Formerly Graduate Assistant. Formerly Undergraduate Research Helper,     

Sports over a Distance

Sport is a domain full of movement-based interactions. These interactions typically have positive health effects as well as an impact on social bonding. We have investigated ways in which computer augmented devices can lead to new sport experiences and explored opportunities to combine physical activities with remote social bonding. Three prototypes have been implemented which showcase movement-based interaction in sports. “Breakout for Two” allows geographically distant users to play a physically exhausting ball game together. “FlyGuy” gives users a hang-glide experience controllable through body movement. “Push’N’Pull” uses isometric exercise equipment over a network to encourage users to complete a cooperative game whilst performing intense muscular actions. A comparison of these applications shows that such movement-based interaction in a networked environment allows players in different locations to achieve a work out and also to socialize. Based on these projects, we conclude with practical design implications for future Exertion Interfaces.     

The longitudinal relations of teacher expectations to achievement in the early school years.

There is relatively little research on the role of teacher expectations in the early school years or the importance of teacher expectations as a predictor of future academic achievement. The current study investigated these issues in the reading and mathematic domains for young children. Data from nearly 1,000 children and families at 1st, 3rd, and 5th grades were included. Child sex and social skills emerged as consistent predictors of teacher expectations of reading and, to a lesser extent, math ability. In predicting actual future academic achievement, results showed that teacher expectations were differentially related to achievement in reading and math. There was no evidence that teacher expectations accumulate but some evidence that they remain durable over time for math achievement. In addition, teacher expectations were more strongly related to later achievement for groups of children who might be considered to be at risk. (PsycINFO Database Record (c) 2010 APA, all rights reserved)