4,548 research outputs found
James Patrick Browne
No full text"D.R. Browne, James Patri[ck] SX 28887 D. Sec. 12 Div. Sigs".Index to the location of names on the quilt ; B2Despatch Rider Browne, James Patrick. SX 28887. D. Section, 12th Division Signals.These patches were signed by people who visited the Northern Territory during the Year of Commemoration of the Bombing of Darwin, 1992, or who wrote from interstate or overseas during that year. The quilt measures almost five metres by three, and is designed to resemble a typical porcellanite stone wall as can still be seen on some old Darwin buildings. In addition to the names on the Quilt there are nurse's colourpatch, the emblem of the Civil Construction Corps and twenty pictures of sites which would have been familiar to people of Darwin at the time. Some of the buildings can still be seen today, whereas others have disappeared as a result of enemy action, Cyclone Tracy or the indomitable march of progress. The illustrations on the Quilt were based on photographs taken during the war years and now held in the collections of the Northern Territory Library. The Quilt was made by Jenny Armour, and took about 18 months of weekends and other free time to complete, using techniques of patchwork, applique, and machine embroidery and was quilted using 100% Australian wool batting
Unsteady particle accumulation in wall turbulence
No full textWe propose the asymptotic theory of unsteady accumulation of inertial particles in the viscous sublayer of wall-bounded turbulent flow. We derive the diffusion equation for the particle concentration in the viscous sublayer and find the self-similar exact solution of this equation at large times. It is shown that near the wall the maximal concentration grows as the square root of time, while the distance from the wall to the concentration pike as well as its width decay as inverse square root of time. The obtained solution is corroborated by the results of stochastic Lagrangian simulations
The influence of subgrid-scale modelling on the performance of a new non-equilibrium wall-model for large-eddy simulation
No full textThe computational cost of wall-resolved large-eddy simulations (LES) rapidly becomes prohibitive with increasing Reynolds number. Wall-modelled LES attempts to significantly reduce the computational cost of simulating wall-bounded turbulent flows by modelling the effect of the near-wall small-scale motions, rather than fully or partially resolving them. The present study concentrates on a new wall-model that is able to predict fluctuating wall-shear stress given a large-scale velocity input. The velocity input for the model is affected by the choice of subgrid-scale (SGS) model. Therefore, this study also focusses on the impact of the SGS-model on the distribution of quantities at the wall. Results show that the new wall-model is able to resolve more of the wall shear-stress variance than a standard wall-model; and that the SGS-model affects the distribution of fluctuations of both wall-shear stress and wall-pressure
Concrete Flow in Diaphragm Wall Panels: A Full-Scale In-Situ Test
No full textFlow processes, taking place during the concreting of diaphragm wall panels (D-wall panels), are of great importance for the quality of the wall. During this phase, the bentonite, present in the excavated trench, should be completely replaced by concrete in a controlled way. In literature several cases are described in which this process resulted in bentonite inclusions in the panel. These inclusions often lead to severe problems, like leakages, for the building pit to be excavated within the diaphragm wall panels. Beside the risks for the building pit, leakages caused by bentonite inclusions can also have large consequences for nearby constructions. In this article, set up and results of a full-scale diaphragm wall test are described. Conclusions are drawn with regard to the influence of several parameters on the flow process and subsequently on the quality of the wall and the risk on bentonite inclusions
Near Wall PIV-Measurements on the Windward Slope of a Hill
No full textThe turbulent flow over periodic hills was measured near to the wall, using planar Particle-Image-Velocimetry (PIV) at high spatial resolution. Our focus is on the near wall turbulence structure on the windward slope of the hill. For large-eddy simulation (LES) we suspect that, if this was not predicted accurately, it affects the prediction of the velocity profiles over the hill crest which in turn will affect the recirculation length downstream of the hill. Regarding the time averaged velocities, we were able to resolve the linear viscous region of the boundary layer. The velocity distribution and also the Reynolds stress does not comply with the law of the wall as it is valid for a turbulent boundary layer at equilibrium
Patrick D Wall - Full Bibliography from PATRICK DAVID WALL 5 April 1925 — 8 August 2001 Elected FRS 1989
No full textPatrick (Pat) Wall was a neurophysiologist and true pioneer in the science of pain. He discovered that the sensory information arising from receptors in our body, such as those for touch and heat, could be modified, or ‘gated’, in the spinal cord by other sensory inputs and also by information descending from the brain; this meant, as is now well recognized, that the final sensory experience is not necessarily predictable from the original pain-eliciting sensory input. He used this to explain the poor relationship between injury and pain, and to illustrate the fallacy of judging what someone ‘should’ be feeling from the sensory input alone. In 1969, together with his colleague, Ron Melzack, Pat proposed this ‘gate control theory of pain’ and the circuit diagram that summarized how central spinal cord circuits can modulate sensory inputs. Later on, he began to regret that ‘goddamned diagram’, which had come to dominate his life and work, but, like all great models, it paved the way for the future. Now, over 50 years after it was first published, molecular genetic dissection of dorsal horn neuronal circuitry has indisputably confirmed that sensory inputs are indeed ‘gated’ in the spinal cord dorsal horn. Through a career that started with a medical degree in Oxford, almost 20 years at Yale and MIT in the USA, and continued at UCL in London, Pat Wall was a highly influential, critical, creative and original thinker who revolutionized our understanding of the relationship between injury and pain, and who also became a champion for all who suffered from chronic pain
The Gevelco quay wall: Research into the causes of the measured displacements
No full textIn this thesis, an investigation is described to the measured horizontal displacements of a quay wall in the Port of Rotterdam. This quay wall was built in 2003 to replace an existing jetty. A combined tubular wall was installed and some of the concrete jetty piles were reused as foundation piles for the relieving platform. Anchorage for the quay wall is provided by an eight meter high continuous anchor wall, 38 meter behind the quay wall made of steel sheet piles. The connection between the two walls consists of high strength steel presetressed strands. Prior to describing the actual research in this report, measurements are considered that have been carried out over time on top of the quay wall. These measurements indicate that horizontal displacements increase nonlinearly in time. This trend was the reason for an investigation to all possible causes of the horizontal displacements of the combi wall. In this thesis, the research is discussed and possible causes of the measurements are revealed by considering one representative cross section of the largest part of the quay wall. The main part of this thesis deals with the investigation for possible causes of the measurements and is elaborated by considering the different influences for the representative cross section. Firstly, time dependent soil behaviour is examined. The Koppejan formula and the finite element method are used to determine the influences of consolidation and creep. Due to counteracting prestressing and gravity forces the effects in time due to consolidation and creep seems to be negligible. Secondly, the capacity of the anchor wall is investigated based on Coulomb’s theory and the finite element method. Due to a proven densification of the passive soil wedge, the capacity appeared to be sufficient. Subsequently, macro stability of the soil body between the anchor and combined wall (Kranz stability) is considered. Stability is proven to be sufficient by performing a hand calculation for the drained and undrained situation, followed by a verification calculation with a program based on the sub grade reaction method. Another considered possible cause is the difference in interpretation of the soil profile used in this report and the one used in the design. Therefore, a parametric study for the soil parameters is performed with the sub grade reaction method. These calculations show that the design profile resulted in larger deformations than a soil profile with expected values. Furthermore, it was decided to investigate the influence of the position and magnitude of a surcharge load. When the design load of 50kN/m2 is applied near the anchor wall, it was concluded from calculations that horizontal displacements are almost equal to the measurements. When a higher load is applied at positions further away from the anchor wall, again horizontal displacements appeared to be close to the measured displacements. Both the position and magnitude of loading are described as possible explanations for the measured deformations. Finally, it is concluded that saving money in the design stage by applying an anchor wall, resulted in more deformations than expected and made them dependent on the position of loading. Additionally, it is concluded that applying a higher load than was agreed upon in the terms of reference, resulted in more deformations than expected as well.Hydraulic EngineeringCivil Engineering and Geoscience
At limits of life: multidisciplinary insights reveal environmental constraints on biotic diversity in continental Antarctica
No full textData source: Supporting information, http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0044578#s5Multitrophic communities that maintain the functionality of the extreme Antarctic terrestrial ecosystems, while the simplest of any natural community, are still challenging our knowledge about the limits to life on earth. In this study, we describe and interpret the linkage between the diversity of different trophic level communities to the geological morphology and soil geochemistry in the remote Transantarctic Mountains (Darwin Mountains, 80uS). We examined the distribution and diversity of biota (bacteria, cyanobacteria, lichens, algae, invertebrates) with respect to elevation, age of glacial drift sheets, and soil physicochemistry. Results showed an abiotic spatial gradient with respect to the diversity of the organisms across different trophic levels. More complex communities, in terms of trophic level diversity, were related to the weakly developed younger drifts (Hatherton and Britannia) with higher soil C/N ratio and lower total soluble salts content (thus lower conductivity). Our results indicate that an increase of ion concentration from younger to older drift regions drives a succession of complex to more simple communities, in terms of number of trophic levels and diversity within each group of organisms analysed. This study revealed that integrating diversity across multi-trophic levels of biotic communities with abiotic spatial heterogeneity and geological history is fundamental to understand environmental constraints influencing biological distribution in Antarctic soil ecosystems.Catarina Magalhães, Mark I. Stevens, S. Craig Cary, Becky A. Ball, Bryan C. Storey, Diana H. Wall, Roman Tűrk and Ulrike Ruprech
Cell wall architecture and the role of wall teichoic acid in Staphylococcus aureus
No full textThe bacterium Staphylococcus aureus only synthesises peptidoglycan during cell division at the septum using a complex protein biosynthetic apparatus called the divisome. It divides sequentially in three orthogonal planes, using heritable features within the peptidoglycan architecture to maintain this process over generations. The ‘rib’ features that form this ‘memory’ are remnants of a large belt of peptidoglycan called the ‘piecrust’ that is formed at the initiation of septation and before the septal plate. After division, the ribs remain as orthogonal features, which are bisected by further ‘piecrust’ features from ensuing division cycles. This results in a characteristic pattern of different age peptidoglycan sectors, delineated by ribs of a different architecture.
As well as maintaining cellular viability and shape the peptidoglycan layer also acts as a scaffold for many other polymers, including wall teichoic acid (WTA). WTA is known to direct and modulate cell wall hydrolase activity. There has been recent debate as to its subcellular localisation. In this study, using the bacterial two-hybrid assay, four putative WTA biosynthesis enzymes were found to interact with numerous members of the divisome. Microscopy techniques localised WTA across the entire cell surface except on the piecrust and rib features. It was hypothesised that WTA blocks the rest of the peptidoglycan thereby directing the localisation of hydrolases and other proteins.
The localisation of peptidoglycan hydrolases was studied. Those found to localise to the rib and piecrust features (Atl(glucosaminidase), Atl(amidase), SagB and ScaH) showed a distinct pattern which was completely disrupted in a strain missing WTA. Conversely those (SceD) not associated with rib/piecrust showed no difference to localisation with loss of WTA. The processed forms of Atl (glucosaminidase and amidase) demonstrated different binding properties during the cell cycle and a model to illustrate the cell cycle dependent binding is proposed
The wall : [a short film]
No full textThis film seeks to utilize the mock documentary style of filmmaking to explore one man's struggle to find meaning in his life. Wally Skwarzek is a man with no home, no family, and no purpose. The only thing he manages to cling onto in his dreary existence is his prowess as a vampire hunter. THE WALL was shot on a Canon EOS Rebel T2i Digital SLR camera with a guerilla-like approach to filmmaking. While there are several comedic moments throughout the film's running time, THE WALL also seeks to explore what happens to a man when he has nothing left in life and is pushed to the brink of insanity by the harshness of the world.Thesis (M.A.)Department of TelecommunicationsThe wall & other films -- Genre and its effects on film -- Genre technique when applied to The wall -- Found footage and editing techniques
- …
