bluuebunny/crossref_metadata_2025_split huggingface dataset:
Numerical investigation of transition in a boundary layer subjected to favourable and adverse streamwise pressure gradients and elevated free stream turbulence
Authors: Brinkerhoff Joshua R. , Yaras Metin I. 
Published: September 2015

Laminar-to-turbulent transition of a boundary layer subjected to streamwise pressure gradients and elevated free stream turbulence is computed through direct numerical simulation. The streamwise pressure distribution and elevated free stream turbulence levels mimic the conditions present on the suction side of highly-cambered airfoils. Longitudinal streamwise streaks form in the laminar boundary layer through the selective inclusion of low-frequency disturbances from the free stream turbulence. The spanwise spacing normalized by local inner variables indicates stabilization of the streaks occurs by the favourable pressure gradient and prevents the development of secondary streak instability modes until downstream of the suction peak. Two distinct processes are found to trigger transition to turbulence in the adverse pressure gradient region of the flow. One involves the development of varicose secondary instability of individual low-speed streaks that results in their breakdown and the formation and growth of discrete turbulent spots. The other involves a rapid amplification of free stream disturbances in the inflectional boundary layer in the adverse pressure gradient region that results in a largely homogeneous breakdown to turbulence across the span. The effect of high-frequency free stream disturbances on the streak secondary instability and on the nonlinear processes within the growing turbulent spot are analysed through the inviscid transport of instantaneous vorticity. The results suggest that free stream turbulence contributes to the growth of the turbulent spot by generating large strain rates that activate vortex-stretching and tilting processes within the spot.
Observations of hypervelocity boundary-layer instability
Authors: Parziale N. J. , Shepherd J. E. , Hornung H. G. 
Published: September 2015

A novel optical method is used to measure the high-frequency (up to 3 MHz) density fluctuations that precede transition to turbulence within a laminar boundary layer in a hypervelocity flow. This optical method, focused laser differential interferometry, enables measurements of short-wavelength, high-frequency disturbances that are impossible with conventional instrumentation such as pressure transducers or hot wires. In this work, the T5 reflected-shock tunnel is used to generate flows in air, nitrogen and carbon dioxide with speeds between 3.5 and $5~\text{km}~\text{s}^{-1}$ (Mach numbers between 4 and 6) over a 5° half-angle cone at zero angle of attack. Simultaneous measurements are made at two locations approximately midway along a generator of the 1-m-long cone. With increasing Reynolds number (unit values were between 2 and $5\times 10^{6}~\text{m}^{-1}$), density fluctuations are observed to grow in amplitude and transition from a single narrow band of frequencies consistent with the Mack or second mode of boundary-layer instability to bursts of large-amplitude and spectrally broad disturbances that appear to be precursors of turbulent spots. Disturbances that are sufficiently small in initial amplitude have a wavepacket-like signature and are observed to grow in amplitude between the upstream and downstream measurement locations. A cross-correlation analysis indicates propagation of wavepackets at speeds close to the edge velocity. The free stream flow created by the shock tunnel and the resulting boundary layer on the cone are computed, accounting for chemical and vibrational non-equilibrium processes. Using this base flow, local linear and parabolized stability (PSE) analyses are carried out and compared with the experimental results. Reasonable agreement is found between measured and predicted most unstable frequencies, with the greatest differences being approximately 15 %. The scaling of the observed frequency with the inverse of boundary-layer thickness and directly with the flow velocity are consistent with the characteristics of Mack’s second mode, as well as results of previous researchers on hypersonic boundary layers.
FINITE SYMMETRIC GRAPHS WITH 2-ARC-TRANSITIVE QUOTIENTS: AFFINE CASE
Authors: REZA SALARIAN M. 
Published: September 2015

Let $G$ be a finite group and ${\rm\Gamma}$ a $G$-symmetric graph. Suppose that $G$ is imprimitive on $V({\rm\Gamma})$ with $B$ a block of imprimitivity and ${\mathcal{B}}:=\{B^{g};g\in G\}$ a system of imprimitivity of $G$ on $V({\rm\Gamma})$. Define ${\rm\Gamma}_{{\mathcal{B}}}$ to be the graph with vertex set ${\mathcal{B}}$ such that two blocks $B,C\in {\mathcal{B}}$ are adjacent if and only if there exists at least one edge of ${\rm\Gamma}$ joining a vertex in $B$ and a vertex in $C$. Xu and Zhou [‘Symmetric graphs with 2-arc-transitive quotients’, J. Aust. Math. Soc. 96 (2014), 275–288] obtained necessary conditions under which the graph ${\rm\Gamma}_{{\mathcal{B}}}$ is 2-arc-transitive. In this paper, we completely settle one of the cases defined by certain parameters connected to ${\rm\Gamma}$ and ${\mathcal{B}}$ and show that there is a unique graph corresponding to this case.
Selfhood, Place, and Ideology in German Photo Albums, 1933–1945
Authors: Umbach Maiken 
Published: September 2015

AbstractThis article explores the significance of photography and photo-album making as practices that many Germans used to record their lives during the Third Reich. Millions of photos not only offer insights into everyday life under National Socialism: mass photography itself had a transformative effect, turning seemingly mundane actions into performances for the camera and into conscious acts of self-representation. The article also considers the relationship between amateur snapshots, on the one hand, and propagandistic and commercial photographs, on the other. Identifying connections between the genres, it argues that these are best understood as two-way processes of borrowing and (re-)appropriation, in which private subjectivity and public ideology constantly commingled. Particularly important in linking the two were photos of emotional or affective states, such as relaxation, exploration, introspection, and even melancholy, which were often defined or underscored by the ways in which both civilians and soldiers positioned themselves in relation to particular landscapes. The photographic archival record is highly varied, but such variation notwithstanding, photos helped cement immersive “experience” as the basis for individual and collective identity; this was central to the ideology of the National Socialist regime, even if it never wholly controlled its meanings.
Working Photos: Propaganda, Participation, and the Visual Production of Memory in Nazi Germany
Authors: Prehn Ulrich 
Published: September 2015

AbstractThis article examines images of Germany's “working world” in the 1930s and 1940s. Analyzing photos from three different genres—factory photography, special-occasion industrial photography, and the work of nonprofessional photographers—it addresses a series of questions: How was the “working world” depicted in photographs from this period? What were the different modes, functions, and effects of visual representations of work and workers in these three genres? In what ways did these photographs contribute to the (visual) production and “shaping” of memory—in terms of worker experiences, as well as with respect to attempts by the National Socialists to promote ideological notions of community-building (Vergemeinschaftung)? The main argument is that photography served as an important tool for the mobilization and self-mobilization of German workers under the Nazi regime.
From Private Photography to Mass Circulation: The Queering of East German Visual Culture, 1968–1989
Authors: McLellan Josie 
Published: September 2015

AbstractThis article describes how a particular kind of queer figure moved from private photography into the mainstream of East German visual culture. It begins with a set of private photographs from the late 1960s from the collection of Heino Hilger, a regular, with his friends, at the East Berlin bar Burgfrieden. The photographs show how dressing in drag and the act of photography were important ways of constituting a gay male subculture. After the decriminalization of sex between men in 1968, the gay scene became bolder and more political in East Germany. The subversion of gender norms was central to the activism of groups such as the Homosexual Interest Group Berlin (HIB) and Gays in the Church. The visibility of the queer figure culminated in the late 1980s, when parts of the film Coming Out were filmed in Burgfrieden and when the popular monthly Das Magazin published a three-part feature on male homosexuality. What all these cultural artifacts and events had in common was not just a critique of the heterosexual norm, but also a queering of the boundaries between masculinity and femininity.
3D geology in a 2D country: perspectives for geological surveying in the Netherlands
Authors: van der Meulen M.J. , Doornenbal J.C. , Gunnink J.L. , Stafleu J. , Schokker J. , Vernes R.W. , van Geer F.C. , van Gessel S.F. , van Heteren S. , van Leeuwen R.J.W. , Bakker M.A.J. , Bogaard P.J.F. , Busschers F.S. , Griffioen J. , Gruijters S.H.L.L. , Kiden P. , Schroot B.M. , Simmelink H.J. , van Berkel W.O. , van der Krogt R.A.A. , Westerhoff W.E. , van Daalen T.M. 
Published: September 2015

AbstractOver the last ten to twenty years, geological surveys all over the world have been entangled in a process of digitisation. Their paper archives, built over many decades, have largely been replaced by electronic databases. The systematic production of geological map sheets is being replaced by 3D subsurface modelling, the results of which are distributed electronically. In the Netherlands, this transition is both being accelerated and concluded by a new law that will govern management and utilisation of subsurface information. Under this law, the Geological Survey of the Netherlands has been commissioned to build a key register for the subsurface: a single national database for subsurface data and information, which Dutch government bodies are obliged to use when making policies or decisions that pertain to, or can be affected by the subsurface. This requires the Survey to rethink and redesign a substantial part of its operation: from data acquisition and interpretation to delivery. It has also helped shape our view on geological surveying in the future.The key register, which is expected to start becoming operational in 2015, will contain vast quantities of subsurface data, as well as their interpretation into 3D models. The obligatory consultation of the register will raise user expectations of the reliability of all information it contains, and requires a strong focus on confidence issues. Building the necessary systems and meeting quality requirements is our biggest challenge in the upcoming years. The next step change will be towards building 4D models, which represent not only geological conditions in space, but also processes in time such as subsidence, anthropogenic effects, and those associated with global change.
The complete mitochondrial genome of Pseudanoplocephala crawfordi and a comparison with closely related cestode species
Authors: Zhao G.H. , Wang H.B. , Jia Y.Q. , Zhao W. , Hu X.F. , Yu S.K. , Liu G.H. 
Published: September 2015

AbstractPseudanoplocephala crawfordi is an important zoonotic cestode of economic significance and public health concern. In spite of its significance as a pathogen, the systematics, genetics, epidemiology and biology of this parasite remain poorly understood. In the present study, we sequenced and characterized the complete mitochondrial (mt) genome of P. crawfordi, which is 14,192 bp long and encodes 36 genes, including 12 protein-coding genes, 22 transfer RNA genes and two ribosomal RNA genes. Phylogenetic analysis of the concatenated amino acid sequences using the Bayesian inference (BI) method showed that P. crawfordi was closely related to the family Hymenolepididae. Considering that the taxonomic status of P. crawfordi has been controversial when based only on morphological features, the mt genome obtained here will provide novel molecular markers to ascertain the phylogenetic position of this parasite accurately.
Energy-optimal relative timing of stance-leg push-off and swing-leg retraction in walking
Authors: Hasaneini S. Javad , Bertram John E. A. , Macnab Chris J. B. 
Published: September 2015

SUMMARYSwing-leg retraction in walking is the slowing or reversal of the forward rotation of the swing leg at the end of the swing phase prior to ground contact. For retraction, a hip torque is often applied to the swing leg at about the same time as stance-leg push-off. Due to mechanical coupling, the push-off force affects leg swing, and hip torque affects the stance-leg extension. This coupling makes the energetic costs of retraction and push-off depend on their relative timing. Here, we find the energy-optimal relative timing of these actions. We first use a simplified walking model with non-regenerative actuators, a work-based energetic-cost, and impulsive actuations. Depending on whether the late-swing hip torque is retracting or extending (pushing the leg forward), we find that the optimum is obtained by applying the impulsive hip torque either following or prior to the impulsive push-off force, respectively. These trends extend to other bipedal models and to aperiodic gaits, and are independent of step lengths and walking speeds. In one simulation, the cost of a walking step is increased by 17.6% if retraction torque comes before push-off. To consider non-impulsive actuation and the cost of force production, we add a force-squared (F2) term to the work cost. We show that this cost promotes simultaneous push-off force and retracting torque, but does not change the result that any extending torque should come prior to push-off. A high-fidelity optimization of the Cornell Ranger robot is consistent with the swing-retraction trends from the models above.
WHAT IS THE ROLE OF COMMUNITY PREFERENCE INFORMATION IN HEALTH TECHNOLOGY ASSESSMENT DECISION MAKING? A CASE STUDY OF COLORECTAL CANCER SCREENING
Authors: Wortley Sally , Flitcroft Kathy , Howard Kirsten 
Published: September 2015

Objectives:The aim of this study was to determine the role of community preference information from discrete choice studies of colorectal cancer (CRC) screening in health technology assessment (HTA) reports and subsequent policy decisions.Methods:We undertook a systematic review of discrete choice studies of CRC screening. Included studies were reviewed to assess the policy context of the research. For those studies that cited a recent or pending review of CRC screening, further searches were undertaken to determine the extent to which community preference information was incorporated into the HTA decision-making process.Results:Eight discrete choice studies that evaluated preferences for CRC screening were identified. Four of these studies referred to a national or local review of CRC screening in three countries: Australia, Canada, and the Netherlands. Our review of subsequently released health policy documents showed that while consideration was given to community views on CRC, policy was not informed by discrete choice evidence.Conclusions:Preferences and values of patients are increasingly being considered “evidence” to be incorporated into HTA reports. Discrete choice methodology is a rigorous quantitative method for eliciting preferences and while as a methodology it is growing in profile, it would appear that the results of such research are not being systematically translated or integrated into HTA reports. A formalized approach is needed to incorporate preference literature into the HTA decision-making process.
Disturbance impacts on large rain-forest vertebrates differ with edge type and regional context in Sulawesi, Indonesia
Authors: Froese Graden Z.L. , Contasti Adrienne L. , Mustari Abdul Haris , Brodie Jedediah F. 
Published: September 2015

Abstract:Anthropogenic edge effects, whereby disturbance strength increases in proximity to ecotone boundaries, are known to strongly affect individual species but we lack a general understanding of how they vary by species, disturbance type and regional context. We deployed 46 camera-trap stations for a total of 3545 trap-days at two sites in Sulawesi, Indonesia, obtaining 937 detections of five vertebrate species. Anoa (Bubalus spp.) were more abundant near edges, booted macaque (Macaca ochreata) and red jungle fowl (Gallus gallus) were less abundant near edges, and edges did not impact Sulawesi warty pig (Sus celebensis) or Malay civet (Viverra tangalunga). But the relative importance of habitat disturbance from agriculture, roads and villages differed for each species, and edge-induced disturbances varied not only in magnitude but also in direction between the study areas. In the strongest instance, macaque local abundance was 3.5 times higher near villages than it was 3 km into the forest in one reserve, but 2.8 times higher 3 km into the forest than near villages in the other reserve. Our results suggest that responses to habitat edges among species and edge types are idiosyncratic, and that landscape-level context can strongly alter the influence of local disturbance on biodiversity.
Further support for thermal ecosystem engineering by wandering albatross
Authors: Haupt Tanya M. , Sinclair Brent J. , Shaw Justine D. , Chown Steven L. 
Published: September 2015

AbstractOn sub-Antarctic Marion Island, wandering albatross (Diomedea exulans) nests support high abundances of tineid moth,Pringleophaga marioni, caterpillars. Previous work proposed that the birds serve as thermal ecosystem engineers by elevating nest temperatures relative to ambient, thereby promoting growth and survival of the caterpillars. However, only 17 days of temperature data were presented previously, despite year-long nest occupation by birds. Previous sampling was also restricted to old and recently failed nests, though nests from which chicks have recently fledged are key to understanding how the engineering effect is realized. Here we build on previous work by providing nest temperature data for a full year and by sampling all three nest types. For the full duration of nest occupancy, temperatures within occupied nests are significantly higher, consistently byc. 7°C, than those in surrounding soils and abandoned nests, declining noticeably when chicks fledge. Caterpillar abundance is significantly higher in new nests compared to nests from which chicks have fledged, which in turn have higher caterpillar abundances than old nests. Combined with recent information on the life history ofP. marioni, our data suggest that caterpillars are incidentally added to the nests during nest construction, and subsequently benefit from an engineering effect.
Proteomics of pediatric heart failure: from traditional biomarkers to new discovery strategies
Authors: Xu Mingguo , Ramirez-Correa Genaro A. , Murphy Anne M. 
Published: September 2015

AbstractHeart failure in children is a complex clinical syndrome with multiple aetiologies. The underlying disorders that lead to heart failure in children differ significantly from those in adults. Some clinical biomarkers for heart failure status and prognosis appear to be useful in both age groups. This review outlines the use and the present status of biomarkers for heart failure in paediatric cardiology. Furthermore, clinical scenarios in which development of new biomarkers might address management or prognosis are discussed. Finally, strategies for proteomic discovery of novel biomarkers and application to practice are described.
Stem cell therapy for CHD: towards translation
Authors: Wehman Brody , Siddiqui Osama T. , Mishra Rachana , Sharma Sudhish , Kaushal Sunjay 
Published: September 2015

AbstractStem cell therapy has the optimistic goal of regenerating the myocardium as defined by re-growth of lost or destroyed myocardium. As applied to patients with heart failure, many confuse or limit the regenerative definition to just improving myocardial function and/or decreasing myocardial scar formation, which may not be the most important clinical outcome to achieve in this promising field of molecular medicine. Many different stem cell-based therapies have been tested and have demonstrated a safe and feasible profile in adult patients with heart failure, but with varied efficacious end points reported. Although not achieved as of yet, the encompassing goal to regenerate the heart is still believed to be within reach using these cell-based therapies in adult patients with heart failure, as the first-generation therapies are now being tested in different phases of clinical trials. Similar efforts to foster the translation of stem cell therapy to children with heart failure have, however, been limited. In this review, we aim to summarise the findings from pre-clinical models and clinical experiences to date that have focussed on the evaluation of stem cell therapy in children with heart failure. Finally, we present methodological considerations pertinent to the design of a stem cell-based trial for children with heart failure, as they represent a population of patients with very different sets of issues when compared with adult patients. As has been taught by many learned clinicians, children are not small adults!
Clinical management of patients with acute heart failure
Authors: Rossano Joseph W. 
Published: September 2015

AbstractAcute heart failure is a common and serious complication of congenital and acquired heart disease, and it is associated with significant morbidity, mortality, and costs. When a patient is admitted to the hospital with acute heart failure, there are several important goals for the hospital admission, including maintaining adequate perfusion, establishing the underlying aetiology for the heart failure, patient and family education, and discharge from the hospital in a stable condition. The pathway to home discharge is variable and may include inotropic therapy, mechanical circulatory support, and/or heart transplantation. This review will cover the epidemiology, presentation, and management of acute heart failure in children.
Diagnosis and treatment of foetal heart failure: foetal echocardiography and foetal hydrops*
Authors: Huhta James C. 
Published: September 2015

AbstractFoetal echocardiography has progressed to be able to diagnose many forms of CHD and to assess the prognosis of cardiac lesions based on their anatomy and presentation in utero. This article outlines a straightforward method for the rapid evaluation of foetus that may have congestive heart failure with or without hydrops and for the differentiation of the pre-hydropic state from normal. The presence of signs of foetal heart failure, such as cardiomegaly or valvular regurgitation, gives clues to the aetiology of hydrops. The assessment of the prognosis of hydrops foetalis can be difficult but can be aided by the use of the cardiovascular profile score. Once identified, the neurohumoral effects of foetal heart failure can be ameliorated using transplacental digoxin if the hydrops has not progressed.