bluuebunny/crossref_metadata_2025_split huggingface dataset:
In-flight simulation of wake encounters using deformed vortices
Authors: Vechtel D. 
Published: February 2016

AbstractDuring the decay process the shape of wake vortices changes significantly which has an influence on the encounter characteristics, hence on the encounter hazard. In order to evaluate the influence of vortex deformation on the wake encounter hazard, in-flight simulations with the DLR research aircraft ATTAS were carried out. For a realistic analysis of wake encounters flow fields of matured vortices were generated with large eddy simulations. These flow fields were used for the determination of histories of induced forces and moments acting on the wake encountering aircraft. The force and moment histories were then fed into the equations of motions of the non-linear six degree-of-freedom in-flight simulation of the DLR research aircraft ATTAS. In order to compare different stages of vortex deformation, encounters were simulated in flight with wavy vortices and vortex rings. The most important benefit of the in-flight-simulation is the realistic environment, which enables a realistic assessment of pilots’ encounter acceptance. The analysed scenario was of a wake encounter during final approach. The encounter conditions correspond to separation distances of about 4nm and 5nm behind an aircraft of the ‘heavy’ category. During the encounters the ATTAS was flown under manual control. Altogether 31 encounters were simulated in flight, 9 with wavy vortices and 22 with vortex rings.
Effect of a special reinforcement on the elastic properties of micro- and nanocomposites with polymer matrix
Authors: Guz I. A. , Rushchitsky J. J. , Guz A. N. 
Published: February 2016

AbstractThe paper revisits some of the well-known models in the mechanics of structurally heterogeneous media for the purpose of analysing their suitability to describe properties of nanocomposites and their mechanical behaviour. It also presents a new multi-component model for predicting the mechanical properties of micro- and nanocomposites reinforced either by whiskerising the microfibres or by bristlising the nanowires. The mathematical formulation of the model is based on using the Muskhelishvili complex potentials for each domain occupied by a separate component. As an example, the effective elastic constants are computed for fibrous composites with four different densities of whiskerisation. It is shown that the increase in the number of bristles per unit surface of the fibres gives a very strong rise to the value of Young’s modulus. However, the shear modulus, being the driving parameter for the strength estimation of the entire composition, is less sensitive to this factor.
Comparison of flight test data with a computational fluid dynamics model of a Scottish Aviation Bulldog aircraft
Authors: Lawson N. J. , Salmon N. , Gautrey J. E. , Bailey R. 
Published: February 2016

AbstractThe following paper presents detailed aerodynamic data of a Scottish Aviation Bulldog light aircraft. The data is taken from the pre-stall region of the aircraft flight envelope through two flight test methods and from a geometrically accurate computational fluid dynamics (CFD) model of the full scale aircraft, which was meshed in Ansys ICEM CFD and solved in Ansys Fluent. The fidelity of the CFD model was achieved by development of a CATIA solid model with surfaces matching a spatial point cloud of the aircraft taken using a 3D laser scanner. Following a CFD verification process, a 3·4m hybrid mesh with a Spalart-Allmaras (SA) turbulence model was found to give the best overall lift and drag characteristics. Further detailed comparisons with the glide flight test data showed the CFD drag polar to have 63% lower zero lift drag, although this discrepancy was related to the simplification of the original CATIA surface model, which excluded the undercarriage, aerials and other protuberance drags. Inclusion of estimates of these sources of drag resulted in a match in zero lift drag to within 15% and a maximum lift to drag of 10:1 which was within 11% of the glide flight test result. The remaining drag discrepancy is attributed to other effects including trim drag and the surface finish of the actual aircraft.
Numerical and experimental investigation of tip leakage flow and heat transfer using idealised rotor-tip models at transonic conditions
Authors: Krishnababu S. K. , Hodson H. P. , Dawes W. N. , Newton P. J. , Lock G. D. 
Published: February 2016

AbstractThe effect of tip geometry on discharge coefficient and heat transfer is investigated both experimentally and numerically using idealised models of an unshrouded rotor blade. A flat tip was compared with two squealer-type geometries (a cavity and suction-side squealer) under the transonic conditions expected in the gas turbine engine. Heat transfer measurements were performed using a transient liquid crystal technique while a duplicate test section was used for measuring the pressure field. Computations were carried out using an unstructured, fully compressible, three-dimensional RANS (Reynolds averaged Navier Stokes) solver. Initial computations performed using a low Reynolds number k-ε model demonstrated the inability of the model to predict the Nusselt number with reasonable accuracy. Further computations performed using a low Reynolds number k-ω model improved the predictions dramatically. The computed discharge coefficient and the average Nusselt number over the blade tip agreed well with the experiments. Three upstream-total to exit-static pressure ratios were used to create a range of engine-representative Mach numbers. Both experimental and numerical studies at the lower pressure ratio of 1·3 (exit Mach number ~ 0·65) established the cavity geometry as the best performer from an aerodynamic perspective by reducing the discharge through the tip. However, from the heat transfer perspective, both the peak Nusselt number and the average heat transfer to the tip were higher than the flat tip. At the higher pressure ratios of 1·85 and 2·27 (corresponding to exit Mach numbers ~ 0·98 and 1·12) the discharge coefficient and heat transfer to the tip increases. This paper explores the fluid dynamics associated with these flows and shows that the highest heat transfer is caused by reattachment and flow impingement. The fluid dynamic computations provide insight into the experimental measurements and were successfully compared with simple analytical models.
CFD fire simulation of the Swissair Flight 111 in-flight fire – Part II: Fire spread analysis
Authors: Jia F. , Patel M. K. , Galea E. R. , Grandison A. , Ewer J. 
Published: February 2016

AbstractIn 1998, Swissair Flight 111 (SR111) developed an in-flight fire shortly after take-off which resulted in the loss of the aircraft, a McDonnell Douglas MD-11, and all passengers and crew. The Transportation Safety Board (TSB) of Canada, Fire and Explosion Group launched a four year investigation into the incident in an attempt to understand the cause and subsequent mechanisms which lead to the rapid spread of the in-flight fire. As part of this investigation, the SMARTFIRE Computational Fluid Dynamics (CFD) software was used to predict the ‘possible’ development of the fire and associated smoke movement. In this paper the CFD fire simulations are presented and model predictions compared with key findings from the investigation. The model predictions are shown to be consistent with a number of the investigation findings associated with the early stages of the fire development. The analysis makes use of simulated pre-fire airflow conditions within the MD-11 cockpit and above ceiling region presented in an earlier publication (Part I) which was published in The Aeronautical Journal in January 2006.
Active Control of a hybrid actuation system for aircraft vertical fin buffet load alleviation
Authors: Chen Y. , Wickramasinghe V. , Zimcik D. 
Published: February 2016

AbstractTwin-tail fighter aircraft may experience intense buffet loads when flying at high angles of attack. One such aircraft is the F/A-18 where the broadband buffet loads primarily excite the first bending and torsional modes of the vertical fin, resulting in significant vibration and dynamic stresses on the vertical tail structure. This buffet phenomenon reduces the fatigue life of the aircraft structure while decreasing mission availability.An international technical co-operation program was initiated to develop a novel hybrid actuation system to actively alleviate the buffet response of a full-scale F/A-18 vertical fin. A hydraulic rudder actuator was used to control the bending mode of the vertical fin using rudder inertia forces. Multiple macro fiber composite actuators were distributed optimally to provide maximum induced strain control authority for the torsional mode. In order to develop an effective control law, a system identification approach was conducted to obtain a state-space model of the vertical fin using open-loop test data. An LQG control law was selected to minimise the dynamic response of the vertical fin at critical locations. The effectiveness of the control law was verified through extensive simulation prior to closed-loop experiments. The LQG control law demonstrated high robustness in all excitation load conditions; both bending and torsional vibration modes of the vertical tail were suppressed effectively and simultaneously. The dynamic stress and acceleration response at critical locations were also reduced significantly. A closed-loop experiment was conducted on a full-scale F/A-18 empennage using the IFOSTP test rig, and the experimental results verified the effectiveness of the control law development methodology used for the full-scale hybrid buffet load system for the F/A-18 aircraft. In addition, the ground vibration test demonstrated that the hybrid actuation system is a feasible solution to alleviate the vertical tail buffet loads in high performance fighter aircraft.
Inositol for the prevention of neural tube defects: a pilot randomised controlled trial
Authors: Greene Nicholas D. E. , Leung Kit-Yi , Gay Victoria , Burren Katie , Mills Kevin , Chitty Lyn S. , Copp Andrew J. 
Published: February 2016

AbstractAlthough peri-conceptional folic acid (FA) supplementation can prevent a proportion of neural tube defects (NTD), there is increasing evidence that many NTD are FA non-responsive. The vitamin-like molecule inositol may offer a novel approach to preventing FA-non-responsive NTD. Inositol prevented NTD in a genetic mouse model, and was well tolerated by women in a small study of NTD recurrence. In the present study, we report the Prevention of Neural Tube Defects by Inositol (PONTI) pilot study designed to gain further experience of inositol usage in human pregnancy as a preliminary trial to a future large-scale controlled trial to evaluate efficacy of inositol in NTD prevention. Study subjects were UK women with a previous NTD pregnancy who planned to become pregnant again. Of 117 women who made contact, ninety-nine proved eligible and forty-seven agreed to be randomised (double-blind) to peri-conceptional supplementation with inositol plus FA or placebo plus FA. In total, thirty-three randomised pregnancies produced one NTD recurrence in the placebo plus FA group (n19) and no recurrences in the inositol plus FA group (n14). Of fifty-two women who declined randomisation, the peri-conceptional supplementation regimen and outcomes of twenty-two further pregnancies were documented. Two NTD recurred, both in women who took only FA in their next pregnancy. No adverse pregnancy events were associated with inositol supplementation. The findings of the PONTI pilot study encourage a large-scale controlled trial of inositol for NTD prevention, but indicate the need for a careful study design in view of the unwillingness of many high-risk women to be randomised.
THE GALWAY PACKET-BOAT CONTRACT AND THE POLITICS OF PUBLIC EXPENDITURE IN MID-VICTORIAN IRELAND
Authors: KANTER DOUGLAS 
Published: February 2016

AbstractThis article argues that political considerations, economic theory, attitudes toward public finance, and concerns about regional development all influenced contemporary responses to the Galway packet-boat contract of 1859–64. Though historians have conventionally depicted the dispute over the contract as an episode in Victorian high politics, it maintains that the controversy surrounding the agreement between the Galway Company and the state cannot be understood solely in terms of party manoeuvre at Westminster. In the context of the Union between Britain and Ireland, the Galway contract raised important questions about the role of the British government in fostering Irish economic development through public expenditure. Politicians and opinion-makers adopted a variety of ideologically informed positions when addressing this issue, resulting in diverse approaches to state intervention, often across party lines. While political calculation and pressure from interest groups certainly affected policy, the substantive debate on the contract helped to shape the late Victorian Irish policy of both British parties by clarifying contemporary ideas about the economic functions appropriate to the Union state.
Predicting the potential distribution of the Endangered huemul deer Hippocamelus bisulcus in North Patagonia
Authors: Quevedo Paloma , von Hardenberg Achaz , Pastore Hernán , Álvarez José , Corti Paulo 
Published: February 2016

AbstractHabitat loss is one of the main threats to wildlife, particularly large mammals. Estimating the potential distribution of threatened species to guide surveys and conservation is crucial, primarily because such species tend to exist in small fragmented populations. The Endangered huemul deer Hippocamelus bisulcus is endemic to the southern Andes of Chile and Argentina. Although the species occurs in the Valdivian Ecoregion, a hotspot for biodiversity, we have no information on its occupancy and potential distribution in this region. We built and compared species distribution models for huemul using the maximum entropy approach, using 258 presence records and sets of bioclimatic and geographical variables as predictors, with the objective of assessing the potential distribution of the species in the Valdivian Ecoregion. Annual temperature range and summer precipitation were the predictive variables with the greatest influence in the best-fitting model. Approximately 12,360 km2 of the study area was identified as suitable habitat for the huemul, of which 30% is included in the national protected area systems of Chile and Argentina. The map of potential distribution produced by our model will facilitate prioritization of future survey efforts in other remote and unexplored areas in which huemul have not been recorded since the 1980s but where there is a high probability of their occurrence.
Does it matter where the children are? The wellbeing of elderly people ‘left behind’ by migrant children in Moldova
Authors: WAIDLER JENNIFER , VANORE MICHAELLA , GASSMANN FRANZISKA , SIEGEL MELISSA 
Published: February 2016

ABSTRACTThis paper empirically evaluates the wellbeing of elderly individuals ‘left behind’ by their adult migrant children in Moldova. Using data from a nationally representative household survey conducted in 2011–12 in Moldova, the wellbeing outcomes of elderly individuals aged 60 and older with and without adult children living abroad are compared (N = 1,322). A multi-dimensional wellbeing index is constructed on the basis of seven indicators within four dimensions of wellbeing: physical health, housing, social wellbeing and emotional wellbeing. Probit regressions are used to predict the probability of an elderly individual being considered well in each indicator and then on total index level. The results reveal that elderly persons with an adult migrant child have a higher probability of being well in one physical health indicator. Following correction for the selectivity of migration using an instrumental variable approach, however, the migration of an adult child is no longer found to predict significantly the wellbeing of their elderly parents in any dimension, suggesting that migration bears limited consequences for elderly wellbeing.
Activism within music education: working towards inclusion and policy change in the Finnish music school context
Authors: Laes T. , Schmidt P. 
Published: February 2016

The publisher regrets to announce that the institutional affiliation listed for Patrick Schmidt in the above article (Laes & Schmidt 2016) was incorrect. The proper address is given below.The publisher apologises for this error.The University of Western Ontario, Talbot College, 1151 Richmond St., Office 119, London, ON N6A 3K7 Canada. Patrick.schmidt@uwo.ca
Processing of positive-causal and negative-causal coherence relations in primary school children and adults: a test of the cumulative cognitive complexity approach in German
Authors: KNOEPKE JULIA , RICHTER TOBIAS , ISBERNER MAJ-BRITT , NAUMANN JOHANNES , NEEB YVONNE , WEINERT SABINE 
Published: February 2016

AbstractEstablishing local coherence relations is central to text comprehension. Positive-causal coherence relations link a cause and its consequence, whereas negative-causal coherence relations add a contrastive meaning (negation) to the causal link. According to the cumulative cognitive complexity approach, negative-causal coherence relations are cognitively more complex than positive-causal ones. Therefore, they require greater cognitive effort during text comprehension and are acquired later in language development. The present cross-sectional study tested these predictions for German primary school children from Grades 1 to 4 and adults in reading and listening comprehension. Accuracy data in a semantic verification task support the predictions of the cumulative cognitive complexity approach. Negative-causal coherence relations are cognitively more demanding than positive-causal ones. Moreover, our findings indicate that children's comprehension of negative-causal coherence relations continues to develop throughout the course of primary school. Findings are discussed with respect to the generalizability of the cumulative cognitive complexity approach to German.
The 2011 Protests in Inner Mongolia: An Ethno-environmental Perspective
Authors: Baranovitch Nimrod 
Published: February 2016

AbstractIn May 2011, Inner Mongolia experienced the most serious ethnic unrest in the region for 30 years. In this article, I explore the broader context that led to the eruption of the protests, with a particular emphasis on environmental issues. My aim is to explain why environmental issues occupied such a prominent position in the protests, and how these issues were connected to ethnicity. After discussing the material and practical implications of grassland degradation for Mongolian herders, I analyse the symbolic implications of this environmental crisis for the Mongolian educated elite, who have linked environmental issues to ethnic politics and identity. I argue that in the last 20 years or so, Mongolian intellectuals have developed a highly ethnicized environmental discourse, and that this discourse played an important role in informing the 2011 protests. My analysis focuses on this discourse as it is manifested in the domains of art, academia and daily discourse.
Diversity in Democracy: Accommodating Religious Particularity in Largely Secular Legal Systems
Authors: Künkler Mirjam , Sezgin Yüksel 
Published: February 2016

The articles assembled in this symposium share their roots in a workshop we organized at the International Institute for the Sociology of Law (IISJ) in Onati, Spain, in June 2011. The workshop, titled “Legal Pluralism and Democracy. When Does Legal Pluralism Enhance, When Does It Erode Legitimacy of and Trust in Democratic Institutions?” examined the consequences of legal pluralism for various facets of democracy, from human rights and political equality to issues of stateness, legitimacy, and self-determination. Half of the papers discussed the application of customary law in pluri-legal systems, particularly in Africa and South America, while the other half dealt with the application of religious law, especially in Muslim-majority countries as well as Israel and India.Other papers presented at the workshop have been published in the IISJ's “Oñati Socio-Legal Series” on the Social Science Research Network and are available for download at http://papers.ssrn.com/so13/JELJOUR_Results.cfm?form_name=journalbrowse&journal_id=1605943.The three articles featured in this symposium address how the law may take account of diversity in the face of the democratic promise of universal rights standards: they probe the question of how to accommodate cultural particularity while also delivering upon the promise of universal and equal citizenship. Both are crucial sources of legitimacy of and trust in democratic political systems, even while they are also often mutually exclusive standards.
Religious Tribunals in Democratic States: Lessons from the Israeli Rabbinical Courts
Authors: Hacker Daphna 
Published: February 2016

In democratic countries where the law might be influenced by religious communities, family law cases can present one of the most sensitive and complex challenges. Religious laws governing personal status and the supervision of family relations are vital components of many religions and, in some cases, crucial to the cultural survival of the religious community. However, the family laws of some religions are discriminatory towards women, same-sex couples, people of other religions, and other groups. Currently, there is heated political and scholarly debate about the tension between the norms of multiculturalism, which dictate that religious communities be allowed to preserve their values and culture, including through autonomy over family law, and liberal norms prohibiting the discrimination that religious family law can perpetrate.One of the best known liberal advocates for restricting discriminatory cultural practices of minority groups was Susan Moller Okin. Okin maintained that many cultural minorities are more patriarchal than the surrounding culture and that the female members of the patriarchal culture might be much better off were the culture into which they were born to become extinct, if, that is, it could not be altered so as to uphold women's equality. She pointed to religious personal law as one example of a sphere in which patriarchal cultures strive to maintain autonomy at the cost of women's and girls' freedom and basic rights. Consistent with her view, nation states should not give legal autonomy over family matters to patriarchal minorities unless these minorities reform their religious laws so as not to discriminate against or impair the rights of women and girls.