Optimum mix of passive and active control of space structures

The objective of this research was to test vibration suppression (settling time and jitter) of a large space structure (LSS) characterized by low frequency high global vibration modes. Five percent passive damping in a large truss was analyzed, tested and correlated. A representative system article re-target analysis shows that modest levels of passive damping dramatically reduce the control energy required. LSS must incorporate passive damping from the outset. The LSS system performance will not be met by either active or passive damping alone

Moving from Generalisations to Specificity about Mangrove –Saltmarsh Dynamics

Spatial and temporal variability in factors influencing mangrove establishment and survival affects the distribution of mangrove, particularly near their latitudinal limit, where mangrove expansion into saltmarsh is conspicuous. In this paper the spatial variability in mangrove distribution and variability in factors influencing mangrove establishment and survival during the Quaternary period are reviewed, focusing on research at latitudinal limits in Australia and mainland USA. Despite similarities in the response of mangrove to some drivers, the expression of these drivers is both spatially and temporally variable, demonstrating the need for analyses of mangrove-saltmarsh dynamics to move beyond generalizations and incorporate regional and local-scale specificity. We propose i) that precursory recognition that ‘correlation does not mean causation’ is inadequate and assumptions, caveats, and limitations should be clearly articulated in correlative studies; ii) experimental design in manipulative experiments must also articulate the spatial and temporal scale to which the analysis is relevant; and iii) analyses that draw from a range of methods will provide greater confidence. Integrated research programs that transect spatial and temporal scales and incorporate a range of techniques are essential to improve projections. Mangrove-saltmarsh distribution research should move beyond simple models that assume equilibrium between realized and fundamental niches

Parent and teacher perceptions of NAPLAN in a sample of Independent schools in Western Australia

Stories appear frequently in the Australian media regarding parent and teacher perceptions and attitudes towards the National Assessment Program—Literacy and Numeracy. However, thorough empirical investigations of parent perceptions are sparse. This study presents a survey of 345 parents across Years 3 and 5 from a sample of Independent schools in Western Australia. A representative sample of teachers from these schools were also surveyed in order to compare and contrast parent and teacher perspectives about the transparency and accountability associated with testing, the usefulness of results for helping individual students, and the perceived clarity of communication of results. Findings reveal mixed positive and negative views that reside within an overall prevailing low opinion of the testing. Some ways for improving the perception of the testing with the general public are discusse

Investigating the impact of NAPLAN on student, parent and teacher emotional distress in independent schools

Concerns have been raised about the impact Australia’s national standardised testing, the National Assessment Program-Literacy and Numeracy (NAPLAN), has upon the well-being of students, parents and teachers. To date, research evidence is unclear as to the level and extent of emotional distress experienced by stakeholders during testing. Despite an unclear evidence base, the prevailing view is that NAPLAN has a general negative impact upon stakeholder well-being. In a pilot study that surveyed all stakeholder groups across 11 independent schools in Western Australia, we found evidence of a minimal impact from the testing. We also found evidence for a small positive association between student and parent distress during testing, and a moderate positive association between parent and teacher distress during testing and their estimations regarding how NAPLAN impacts other people. Our results are not consistent with the prevailing view that NAPLAN has a broad negative impact on well-being, and highlights the need for further research to inform debates about the usefulness and impact of NAPLAN testing. © 2016, The Australian Association for Research in Education, Inc

New & Noteworthy, June 2018

Contents include: Letters from the past and current presidents; ECD Travel Grant Recipients: Responses from their first conference; Conference Spotlights: Dramaturgs & #METOO: A Conference Report; Call for translators.https://soundideas.pugetsound.edu/lmdanewsletter/1001/thumbnail.jp

A Special Issue (Part-II): mafic-ultramafic rocks andalkaline-carbonatitic magmatism and associated hydrothermalmineralization – dedication to Lia N. Kogarko

Thisisthesecondpartofatwo-volumespecialis- sue of Open Geoscience (formerly Central European Jour- nal of Geosciences) that aims to be instrumental in pro- viding an update of Mac-Ultramac Rocks and Alkaline

Prospectus, September 13, 1978

ELECTION DAYS ARE HERE!; Students get refund from hungry Canteen machines; Recipes for college students; CPR saves lives; Advertising Policy; PC band formed; \u27Lost in a masquerade\u27 Benson creates ecstasy; Creative writers receive assistance; Health issues program new WPCD addition; Operetta to begin tomorrow; Shaker photograph exhibition; Student Elections -- Today!; Cadaver lab is added; Apathetic turnout; Poet contest sponsored; Volleyball clinic held Sept. 9; Meeting Sept. 26 for cheerleaders; WPCD\u27s Top 15 For The Week Of Sept. 11; German club to begin activities; Classifieds; Cimmeron review \u27mediocre\u27; Thought food offered for older adults; Student Activities-\u2778; Doehring keeps on truckin\u27; Coach Jim Reed gets many players; Klems wins first Freddy contest; Cooper recruits well; Williams has busy year ahead of him; Fast Freddy Contest; Cross Country Schedulehttps://spark.parkland.edu/prospectus_1978/1012/thumbnail.jp

Siderophore Biosynthesis But Not Reductive Iron Assimilation Is Essential for Aspergillus fumigatus Virulence

The ability to acquire iron in vivo is essential for most microbial pathogens. Here we show that Aspergillus fumigatus does not have specific mechanisms for the utilization of host iron sources. However, it does have functional siderophore-assisted iron mobilization and reductive iron assimilation systems, both of which are induced upon iron deprivation. Abrogation of reductive iron assimilation, by inactivation of the high affinity iron permease (FtrA), has no effect on virulence in a murine model of invasive aspergillosis. In striking contrast, A. fumigatus l-ornithine-N 5-monooxygenase (SidA), which catalyses the first committed step of hydroxamate-type siderophore biosynthesis, is absolutely essential for virulence. Thus, A. fumigatus SidA is an essential virulence attribute. Combined with the absence of a sidA ortholog—and the fungal siderophore system in general—in mammals, these data demonstrate that the siderophore biosynthetic pathway represents a promising new target for the development of antifungal therapies