Analysis of sorbents and catalysts used during a 90-day manned test

Chemical analysis of organic trace contaminants in simulated space station atmospheres desorbed from molecular sieve, silicon gel, and catalyst bed

Timed Analysis of Security Protocols

We propose a method for engineering security protocols that are aware of timing aspects. We study a simplified version of the well-known Needham Schroeder protocol and the complete Yahalom protocol, where timing information allows the study of different attack scenarios. We model check the protocols using UPPAAL. Further, a taxonomy is obtained by studying and categorising protocols from the well known Clark Jacob library and the Security Protocol Open Repository (SPORE) library. Finally, we present some new challenges and threats that arise when considering time in the analysis, by providing a novel protocol that uses time challenges and exposing a timing attack over an implementation of an existing security protocol

The GED

The General Educational Development (GED) credential is issued on the basis of an eight hour subject-based test. The test claims to establish equivalence between dropouts and traditional high school graduates, opening the door to college and positions in the labor market. In 2008 alone, almost 500,000 dropouts passed the test, amounting to 12% of all high school credentials issued in that year. This chapter reviews the academic literature on the GED, which finds minimal value of the certificate in terms of labor market outcomes and that only a few individuals successfully use it as a path to obtain post-secondary credentials. Although the GED establishes cognitive equivalence on one measure of scholastic aptitude, recipients still face limited opportunity due to deficits in noncognitive skills such as persistence, motivation and reliability. The literature finds that the GED testing program distorts social statistics on high school completion rates, minority graduation gaps, and sources of wage growth. Recent work demonstrates that, through its availability and low cost, the GED also induces some students to drop out of school. The GED program is unique to the United States and Canada, but provides policy insight relevant to any nation's educational context.returns to education, GED, dropouts, graduation rate, noncognitive skills

Educational Leadership Supporting Faculty-Motivated Professional Development in Teaching and Experiential Learning

Teaching is one of the primary responsibilities of most university faculty members. Yet, pedagogical training and professional development in teaching and experiential learning are not employment requirements for most Ontario university faculty. This incongruence impacts faculty’s sense of self-efficacy, ability to protect their academic freedom, and their ability to design pedagogically informed curriculum. Additionally, it can negatively impact student outcomes while influencing institutional reputations and funding. In response, recommendations to address this problem of practice (PoP) must acknowledge the faculty prerogatives of autonomy, self-governance, and academic freedom. For that reason, this Organizational Improvement Plan (OIP) evaluates and proposes educational leadership approaches to promote faculty-motivated professional development at an anonymized institution designated as The Ontario University (OntU). What strategies might further promote the uptake of faculty-driven pedagogical training? With an emphasis on a collaborative, constructivist approach, this OIP recommends distributed and transformational leadership strategies to accommodate the autonomous prerogatives of faculty members and which align with both administrative and collegial governance structures. In addition to using a constructivist framework, the conceptual frameworks of self-determination and learning culture theories are used to evaluate ethical approaches to the PoP and develop recommendations. Ultimately, the goal of this OIP is to inspire and enact meaningful, transformational change at OntU that increases the number of faculty who choose to engage in pedagogical professional development and the realization of its far-reaching benefits to a variety of stakeholders

A direct optical method for the study of grain boundary melting

The structure and evolution of grain boundaries underlies the nature of polycrystalline materials. Here we describe an experimental apparatus and light reflection technique for measuring disorder at grain boundaries in optically clear material, in thermodynamic equilibrium. The approach is demonstrated on ice bicrystals. Crystallographic orientation is measured for each ice sample. The type and concentration of impurity in the liquid can be controlled and the temperature can be continuously recorded and controlled over a range near the melting point. The general methodology is appropriate for a wide variety of materials.Comment: 8 pages, 8 figures, updated with minor changes made to published versio

Three-dimensional foam flow resolved by fast X-ray tomographic microscopy

Thanks to ultra fast and high resolution X-ray tomography, we managed to capture the evolution of the local structure of the bubble network of a 3D foam flowing around a sphere. As for the 2D foam flow around a circular obstacle, we observed an axisymmetric velocity field with a recirculation zone, and indications of a negative wake downstream the obstacle. The bubble deformations, quantified by a shape tensor, are smaller than in 2D, due to a purely 3D feature: the azimuthal bubble shape variation. Moreover, we were able to detect plastic rearrangements, characterized by the neighbor-swapping of four bubbles. Their spatial structure suggest that rearrangements are triggered when films faces get smaller than a characteristic area.Comment: 5 pages, 5 figure

Stress transfer and Quaternary faulting in the northern Alpine foreland

Within the SPP Mountain Building Processes in Four Dimensions (MB-4D) we studied postglacial and present seismic rupturing in the northern Alpine Foreland to better understand the impact and forces of mountain building. We started a seismological field experiment to densify the permanent monitoring networks and the AlpArray Seismic Network. The later was also supported as well as its predecessor UNIBRA (Hetényi et al., 2018; Schlömer et al., 2022). Our StressTransfer network consisted of five recording stations in the Upper Rhine Graben, five in the Molasse Basin and five around the Albstadt Shear Zone (Mader et al., 2021a). The latter are still operating due to the increased seismicity during the last years below the western Swabian Alb. We determined local minimum 1-D seismic velocity models to relocate known events in the study regions (Mader et al., 2021b). Waveform cross-correlation was done to detect hitherto unknown events and recover earthquake sequences around the Albstadt Shear Zone (Mader et al., subm.). To determine fault planes and rupture mechanisms we used relative event locations (hypoDD) and FOCMEC for fault plane solutions. For the Albstadt Shear Zone (ASZ), an NNE–SSW striking left-lateral strike-slip rupture zone, we determined a direction of the maximum horizontal stress (SHmax) of 140°–149°. Down to ca. 7–8 km depth, SHmax is bigger than SV (vertical stress); below this depth, SV is the main stress component. Beneath the shallow Hohenzollerngraben (ca. 2-3 km depth), which is nearly perpendicular to the ASZ, we found an NW-SE striking dextral strike-slip fault zone with very weak micro-seismicity in 11-15 km depth (Figure 1). This zone is possibly a reactivated old upper-crustal tectonic structure. At the interception of the ASZ and the NW-SE striking fault zone we observe NNW-SSE striking sinistral strike-slip and normal faulting micro-earthquakes which belong to a heterogeneous deformation zone with complex faulting. In Figure 1 we summarize our current model for the ASZ and its surroundings. The detection of many micro-earthquakes and the related active faults was only possible with the help of the additional temporal recording stations in the region and the studies of a PhD student (S.M.). We thank the DFG for funding our project and the State Earthquake Service Baden-Württemberg in Freiburg for providing data (Az. 4784//18_3303)

Body Temperature in Free-Roaming Beef Cattle

Body temperature (BT) measurements are traditionally used in diagnosing sick animals, but may also be used as an indicator of stress or activity. Based on results of metabolism studies, Mader et al. (1999) reported that BT can vary as much as 0.9oC and can depend on metabolisable energy (ME) of the diet consumed. Acceptable measures of BT can be obtained from the rectum, vagina, or ear canal. Technologies are also being developed for continuously monitoring BT via radio-telemetry. The objectives of this study were to determine the effect of high concentrate (low fibre) versus high fibre diets on BT, assess the capabilities of obtaining BT in free-roaming cattle, and compare temperatures taken in the rumen with vaginal and tympanic temperatures

Abrupt grain boundary melting in ice

The effect of impurities on the grain boundary melting of ice is investigated through an extension of Derjaguin-Landau-Verwey-Overbeek theory, in which we include retarded potential effects in a calculation of the full frequency dependent van der Waals and Coulombic interactions within a grain boundary. At high dopant concentrations the classical solutal effect dominates the melting behavior. However, depending on the amount of impurity and the surface charge density, as temperature decreases, the attractive tail of the dispersion force interaction begins to compete effectively with the repulsive screened Coulomb interaction. This leads to a film-thickness/temperature curve that changes depending on the relative strengths of these interactions and exhibits a decrease in the film thickness with increasing impurity level. More striking is the fact that at very large film thicknesses, the repulsive Coulomb interaction can be effectively screened leading to an abrupt reduction to zero film thickness.Comment: 8 pages, 1 figur

Efficacy of the A-V Impulse System versus cryotherapy in the reduction of postoperative oedema of the hand: a prospective randomised trial

In a prospective randomised trial, the effects of an intermittent compression hand pump vs. cryotherapy were compared on reduction of postoperative hand swelling and gain in finger movement after distal radius fractures. Although intermittent compression as a physical method for thromboprophylaxis and swelling reduction in orthopaedic and trauma patients of the lower leg are established, a prospective randomised trial for an objective evaluation of the effects of intermittent compression in the upper extremity has not been previously performed. Forty-three subjects (63±33 years, 32 women, 11 men) with a unilateral distal radius fracture treated with transarticular external fixation were randomised into two treatment groups. In group A 21 patients were treated with cryotherapy. In group B 22 patients were treated with an intermittent compression hand pump. Reduction in swelling of the treated hand and MP and PIP joint movement were recorded with computerised assessment software (EVAL Hand Evaluation System) in comparison to the uninjured contralateral side. Reduction of swelling in group A was not statistically significant (28.5% of total swelling or 0.61 cm, SD 0.39, p=0.42), but in group B it was significant (92% of total swelling, 3.62 cm, SD 1.48, p<0.001). Comparison of increases in MP and PIP joint movement (p<0.0016) showed statistically significant differences in favour of the intermittent compression pump. This study demonstrates that intermittent compression is more effective in the reduction of postoperative oedema and gain of finger movement of the hand than cryotherapy