Syntheses, Raman Spectroscopy and Crystal Structures of Alkali Hexa-fluoridorhenates(IV) Revisited

The A2[ReF6] (A = K, Rb and Cs) salts are isotypic and crystallize in the trigonal space group type P\overline{3}m1, adopting the K2[GeF6] structure type. Common to all A2[ReF6] structures are slightly distorted octa­hedral [ReF6]2− anions with an average Re—F bond length of 1.951 (8) Å. In those salts, symmetry lowering on the local [ReF6]2− anions from Oh (free anion) to D3d (solid-state structure) occur. The distortions of the [ReF6]2− anions, as observed in their Raman spectra, are correlated to the size of the counter-cations

What do we know about community engagement in Indigenous education contexts and how might this impact on pathways into higher education?

Community engagement is often cited as a critical component of working with Indigenous communities in both Australia and other countries. Ideally, this involves engaging in ‘bottom-up’ approaches that scope, identify and subsequently respond to community needs and aspirations. Community engagement is usually participatory and developmental in nature. It is often used as a means to shape policy and program development, scope research approaches and support enhanced service delivery in a range of settings, including the education sector. However, the physical, social, cultural, economic and political contexts in which community engagement occurs can be different. As such, there is no definitive approach to what community engagement both ‘looks’ and ‘feels’ like within different Indigenous education contexts. This chapter systematically explores what we already know about Indigenous community engagement, and how this relates to Indigenous education, and more specifically, Indigenous higher education contexts in Australia. We argue that there are four key factors that can impact on pathways into higher education for Indigenous students, which include ‘redefining community engagement from Indigenous standpoints’; ‘appropriately resourcing Indigenous community engagement activities’; ‘continuing to build an evidence base to learn from recent Indigenous community engagement investments’ and the need to ‘move beyond the rhetorical language used in many policy documents and frameworks.’ We conclude by suggesting that improvements in the quality and quantum of Indigenous community engagement work occurring in higher education in Australia will ultimately enhance opportunities for successful Indigenous pathways and transitions into university

The influence of nuclei content on cloud cavitation about a hydrofoil

International audienceThe dynamics of cloud cavitation about a 3D hydrofoil are investigated experimentally in a cavitation tunnel with both an abundance and dearth of freestream nuclei. The rectangular-planform, NACA hydrofoil was tested at a Reynolds number of $1.4 × 10^6$, a cavitation number of 0.55 and an incidence of 6°. High-speed photography of cavitation shedding phenomena was acquired simultaneously with unsteady force measurement to enable identification of cavity shedding modes corresponding with force spectral peaks. Two shedding modes are evident for both the nuclei deplete and abundant cases, although each are driven by different flow phenomena. The high-frequency mode for the nuclei deplete case is driven primarily by large-scale re-entrant jet formation during the growth phase, but shockwave propagation for the collapse phase of the cycle. The weaker low-frequency mode occurs because the strength of shedding at the hydrofoil tip varies at half the fundamental frequency. The dominant mode for the abundant case is the low-frequency mode which is some. times slower than the nuclei deplete case. The high-frequency mode for the nuclei abundant case is due to the propagation of two shockwaves; the passage of the first only partially condenses the cavity, while the second condenses a much larger region of the cavity

Complex Power Distribution Network Investigation Using SPICE Based Extraction from First Principle Formulations

The modeling and the analysis of the power distribution networks (PDN) within multi-layer printed circuit board is crucial for the investigation of the performance of PCB systems. Carrying out such analyses in SPICE based tools has the advantage of being faster than the corresponding full-wave modeling and it allows obtaining both frequency and time domain results

Cloud cavitation behaviour on a hydrofoil due to fluid-structure interaction

International audienceDespite recent extensive research into fluid-structure interaction (FSI) of cavitating hydrofoils there remains insufficient experimental data to explain many of these observed phenomena. The cloud cavitation behaviour around a hydrofoil due to the effect of FSI is investigated utilizing rigid and compliant 3D hydrofoils held in a cantilevered configuration in a cavitation tunnel. The hydrofoils have identical undeformed geometry of tapered planform with constant NACA section. The rigid model is made of stainless steel and the compliant model of carbon and glass fibre reinforced epoxy resin with the structural fibres aligned along the span-wise direction to avoid material bend-twist coupling. Tests were conducted at an incidence of 6°, a mean chord based Reynolds number of $0.7 × 10^6$, and cavitation number of 0.8. Force measurements were simultaneously acquired with high-speed imaging to enable correlation of forces with tip bending deformations and cavity physics. Hydrofoil compliance was seen to dampen the higher frequency force fluctuations while showing strong correlation between normal force and tip deflection. The 3D nature of the flow field was seen to cause complex cavitation behaviour with two shedding modes observed on both models

Distal biceps brachii tendon avulsion

Rupture of the distal insertion of the biceps brachii may lead to severe functional impairment of the upper ex tremity on the basis of resultant weakness of elbow flexion and supination. When the diagnosis of a post- traumatic distal biceps tendon avulsion is made, a simple method of reattachment is possible and func tionally warranted.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/67145/2/10.1177_036354658601400310.pd

Power Integrity Investigation of BGA Footprints by Means of the Segmentation Method

The engineering of the power delivery network is becoming a fundamental issue in the design of high speed digital systems on PCB\u27s. In fact, providing the required power to the different IC\u27s at the specified noisefree voltage levels allows a correct functioning of the overall PCB systems. More over, the ongoing trend of replacing active devices with peripherally located I/O and PWR/GND pins with areally located I/O and PWR/GND pins (BGA packaged) increases the complexity of the models, when power delivery issues need to be studied in a larger contest, such as the overall PCB\u27s. The employment of the powerful, but simple, concept of the segmentation method allows investigation of the power delivery network of the PCB systems in two fundamental stages. During the first stage, a small cut out of the board corresponding to the BGA footprint is modelled with a 3D full wave simulation tool. During the second stage the equivalent impedance network representation corresponding to this cut out is combined, by means of the segmentation method [1-5], with larger pieces of a board, whose network representations can be extracted from the closed form expression of the cavity model approach [6-9]