bluuebunny/crossref_metadata_2025_split huggingface dataset:
Noise generation by turbulence–propeller interaction in asymmetric flow
Authors: Robison Rosalyn A. V. , Peake N. 
Published: October 2014

AbstractThis paper is concerned with a particular source of both broadband and tonal aeroengine noise, termed unsteady distortion noise. This noise arises from the interaction between turbulent eddies, which occur naturally in the atmosphere or are shed from the fuselage, and the rotor. This interaction produces broadband noise across a broad frequency spectrum. In cases in which there is strong streamtube contraction, which is especially true for open rotors at low-speed conditions (such as at take-off or for static testing), tonal noise at frequencies equal to multiples of the blade passing frequency are also produced, owing to the enhanced axial coherence caused by eddy stretching. In a previous paper (Majumdar & Peake, J. Fluid Mech., vol. 359, 1998, pp. 181–216), a model for unsteady distortion noise was developed in axisymmetric flow. However, asymmetric situations are also of much interest, and in this paper we consider two cases of asymmetric distortion: firstly that induced by the proximity of a second rotor, and secondly that caused by non-zero inclination to the flight direction, as found at take-off. This requires significant extension of the previous axisymmetric analysis. We find that the introduction of asymmetric flow features can have a significant decibel effect on the radiated sound power. For instance, in low-speed conditions we find that the tonal level is reduced significantly by the proximity of a second rotor, compared to the axisymmetric case, while the effect on the broadband levels is rather modest.
Dynamics of viscous liquid within a closed elastic cylinder subject to external forces with application to soft robotics
Authors: Elbaz S. B. , Gat A. D. 
Published: October 2014

AbstractViscous flows in contact with elastic structures apply both pressure and shear stress at the solid–liquid interface and thus create internal stress and deformation fields within the solid structure. We study the interaction between the deformation of elastic structures, subject to external forces, and an internal viscous liquid. We neglect inertia in the liquid and solid and focus on viscous flow through a thin-walled slender elastic cylindrical shell as a basic model of a soft robot. Our analysis yields an inhomogeneous linear diffusion equation governing the coupled viscous–elastic system. Solutions for the flow and deformation fields are obtained in closed analytical form. The functionality of the viscous–elastic diffusion process is explored within the context of soft-robotic applications, through analysis of selected solutions to the governing equation. Shell material compressibility is shown to have a unique effect in inducing different flow and deformation regimes. This research may prove valuable to applications such as micro-swimmers, micro-autonomous systems and soft robotics by allowing for the design and control of complex time-varying deformation fields.
Transient growth in strongly stratified shear layers
Authors: Kaminski A. K. , Caulfield C. P. , Taylor J. R. 
Published: October 2014

AbstractWe investigate numerically transient linear growth of three-dimensional perturbations in a stratified shear layer to determine which perturbations optimize the growth of the total kinetic and potential energy over a range of finite target time intervals. The stratified shear layer has an initial parallel hyperbolic tangent velocity distribution with Reynolds number $\def \xmlpi #1{}\def \mathsfbi #1{\boldsymbol {\mathsf {#1}}}\let \le =\leqslant \let \leq =\leqslant \let \ge =\geqslant \let \geq =\geqslant \def \Pr {\mathit {Pr}}\def \Fr {\mathit {Fr}}\def \Rey {\mathit {Re}}\mathit{Re}=U_0 h/\nu =1000$ and Prandtl number $\nu /\kappa =1$, where $\nu $ is the kinematic viscosity of the fluid and $\kappa $ is the diffusivity of the density. The initial stable buoyancy distribution has constant buoyancy frequency $N_0$, and we consider a range of flows with different bulk Richardson number ${\mathit{Ri}}_b=N_0^2h^2/U_0^2$, which also corresponds to the minimum gradient Richardson number ${\mathit{Ri}}_g(z)=N_0^2/(\mathrm{d}U/\mathrm{d} z)^2$ at the midpoint of the shear layer. For short target times, the optimal perturbations are inherently three-dimensional, while for sufficiently long target times and small ${\mathit{Ri}}_b$ the optimal perturbations are closely related to the normal-mode ‘Kelvin–Helmholtz’ (KH) instability, consistent with analogous calculations in an unstratified mixing layer recently reported by Arratia et al. (J. Fluid Mech., vol. 717, 2013, pp. 90–133). However, we demonstrate that non-trivial transient growth occurs even when the Richardson number is sufficiently high to stabilize all normal-mode instabilities, with the optimal perturbation exciting internal waves at some distance from the midpoint of the shear layer.
How Do Mafias Organize?
Authors: Catino Maurizio 
Published: October 2014

AbstractThis article looks at three Italian mafia organizations (Cosa Nostra, Camorra, and ‘Ndrangheta). It applies an organizational approach to the understanding of violence in mafia organizations by studying the relationship between their organizational orders and their criminal behavior. The article identifies two different organizational orders, vertical and horizontal, and demonstrates that Italian mafias, although operating in similar environments, can greatly differ from each other, and over time, in terms of their organizational model. Findings suggest that mafias with a vertical organizational order, due to the presence of higher levels of coordination, (1) have greater control over conflict, as proved by the lower number of “ordinary” murders; and (2) have greater capacity to fight state repression, as testified by the greater number of “high-profile” assassinations (e.g. politicians, magistrates, and other institutional members) that they carry out. Evidence is provided using a mixed-methods approach that combines a qualitative, organizational analysis of historical and judiciary sources, in order to reconstruct the organizational models and their evolution over time, with a quantitative analysis of assassination trends, in order to relate organizational orders to the use of violence.
Exceptional Cases: Epistemic Contributions and Normative Expectations
Authors: Ermakoff Ivan 
Published: October 2014

AbstractExceptional cases are at odds with the typical: they stand out as bizarre and rare. What then could justify their systematic analysis? Elaborating the analytical distinction between anomalies, exceptions and outliers, this paper outlines three potential epistemic contributions of exceptional cases. First, exceptional cases reveal the limits of standard classification categories. In so doing, they problematize usual classificatory grids. Their input is critical. Second, exceptional cases point to new classes of objects. They acquire paradigmatic status when they exemplify the characteristic features of these new classes with utmost clarity. Third, exceptional cases magnify relational patterns that in more mundane contexts lack visibility. Here their contribution is heuristic. These three contributions become possible when we put at bay normative expectations of what should happen, and specify cases by reference to an analytical space of constitutive dimensions. To underscore the general significance of these observations, I draw on examples borrowed from different quarters of the social sciences: the sociology of organizations, ethnomethodology, comparative historical sociology and the history of science.
Accommodating Religious Pluralism in Denmark
Authors: Nielsen Anne Mark 
Published: October 2014

AbstractThis article discusses the room for accommodating religious diversity offered by the particular configuration of secularity existing in Denmark. Theoretically, the article adopts Jose Casanova and Mark Chaves’ proposals to separate analytically between the core elements of secularisation, and to leave open for empirical analyses the development and potential connections between these in different geographical and geo-political contexts.From this perspective, the article discusses the conditions for accommodating religious diversity offered by the peculiar combination prevailing in Denmark of a low level of structural differentiation combined with a high level of rationalisation, generalisation, and privatisation of religion. The article argues that the legal inequality existing in Denmark between religious communities stemming from the existence of a state supported church (i.e. a low level of differentiation) matters less for the accommodation of religious diversity than do widely held and strongly embedded popular sentiments and imaginations of the public sphere as strictly secular (i.e. a high level of rationalisation, generalisation and privatisation of religion).
Challenges to sustainable Arctic tourist lodging: a proposed solution for Greenland
Authors: Qu Jing , Villumsen Arne , Villumsen Ole 
Published: October 2014

ABSTRACTThe beauty of nature in Greenland and the selling point of Greenlandic tourism ‘Our ice is melting, yet it is still here’ have been attracting more tourists in recent years. Therefore, demand for tourist accommodation is expected to grow in the future. Staying overnight in small huts is a traditional way for nomadic Greenlanders and for tourists. However, the austere condition of the existing huts cannot meet requirements nowadays. Meanwhile, climate change is causing retreat of ice, so tourist attractions might change in the future. Therefore the contradiction of ‘improved lodging’, ‘environmental friendliness’ and ‘flexibility of location’ raise the problem for the future development of tourist accommodation. The aim of this work is to explore a desirable solution by developing stand-alone mobile tourist huts with light and heating based on renewable energy supply, and sustainable black waste water management. The cabin can be disassembled into pieces and transported to new areas by trucks, snow scooters, boats or dog-sledges with almost no disturbance to the environment of the original location. In addition, cultural sustainability is also taken into account.
Density dependence in flower visitation rates of cockroach-pollinatedClusia blattophilaon the Nouragues inselberg, French Guiana
Authors: Vlasáková Blanka 
Published: October 2014

Abstract:The effective floral neighbourhood is the radius around a plant where the density of flowering plants and other factors affect visitation rates and pollination success of plants. This study aims to determine this radius and focuses on the effects of conspecific plant density, plant sex and the amount of shrub vegetation on visitation rates ofClusia blattophila, a dioecious bush pollinated byAmazonina platystylatacockroaches. The number of visits did not differ between flower sexes but cockroaches spent less time on the rewardless female flowers. The density effect was scale dependent. The distribution of flowering individuals within the 15-m radius had a significant positive effect on flower visitation rates. At a larger scale (35–45-m radius), an increase in density of male plants led to a decrease in visitation rates, indicating competition for pollinators. Within the smaller radius, the facilitative effect was probably induced by elevated floral advertisement and high mobility of cockroaches at this scale. Within the larger radii, the results indicated that cockroach mobility was restricted and population density was stable at this scale. Density of male plants affected visitation rates because only male plants reward pollinators. Hence, male plants were the true competitors.
Balancing effective conservation with sustainable resource use in protected areas: precluded by knowledge gaps
Authors: VAN WILGEN NICOLA J. , MCGEOCH MELODIE A. 
Published: October 2014

SUMMARYDespite significant expansion of the global protected area (PA) network, this investment has not commonly been matched by investment in their management. This includes managing trade-offs between social and biodiversity goals, including resource use in PAs. While some resource-use activities receive significant attention, the full suite of resources extracted from PA systems is rarely documented. This paper illustrates the potential risk of resource use to PA ecological performance through a survey of resources harvested in South Africa's national parks. Even for this comparatively well-managed suite of parks, significant data gaps preclude assessments of harvest sustainability. Harvest quantities were known for < 8% of the 341 used resources, while 23% were not identified to species level. International Union for the Conservation of Nature Red List conservation status had not been evaluated for 78% of species, and 31% of all species (83% of marine species) had not been evaluated nationally. Protected areas face ongoing pressure to balance people-based and biodiversity outcomes, but whether or not both objectives can be achieved cannot be assessed without adequate data. Managing PAs in future will require consideration of trade-offs between investing in PA expansion, increasing the monitoring and management capacity of PA agencies, and investing in the research needed to support decision making.
One-step synthesis of Ag–reduced graphene oxide nanocomposites and their surface-enhanced Raman scattering activity
Authors: Lin S. , Zhao X. S. , Li Y. F. , Liang C. , Huang K. , Sheng Y. , Wang H. , Ye C. X. , Xu X. , Zhou Y. F. , Fan D. Y. , Shang Y. F. , Yang H. J. , Zhang R. , Wang Y. G. , Lei M. 
Published: October 2014

Ag–reduced graphene oxide (Ag/rGO) nanoparticle composites were synthesized through a facile one-step hydrothermal reaction using GO and silver carbonate (Ag2CO3) as raw materials. The homogeneous silver nanospheres with an average size of 50 nm well dispersed on the surface of rGO were obtained without other additives. During the formation process, GO both promotes the dispersion of Ag2CO3 in aqueous solution and acts as the substrate of silver cations, and the hydrolysis of Ag2CO3 provides silver cations and alkaline condition. Moreover, GO further serves as reducing agent to generate elemental silver in the alkaline condition. The as-prepared materials exhibit excellent surface-enhanced Raman scattering activities when used to detect the Raman signals of R6G absorbed on the Ag/rGO substrate.
Epidemiology of human infections with avian influenza A(H7N9) virus in the two waves before and after October 2013 in Zhejiang province, China
Authors: WANG X. Y. , CHAI C. L. , LI F. D. , HE F. , YU Z. , WANG X. X. , SHANG X. P. , LIU S. L. , LIN J. F. 
Published: October 2014

SUMMARYWe compared the epidemiological and clinical features of avian influenza A(H7N9) virus infections in the population in Zhejiang province, China, between March and April 2013 (first wave) and October 2013 and February 2014 (second wave). No statistical difference was found for age, sex, occupation, presence of underlying conditions, exposure history, white blood cell count, lymphocyte percentage and illness timeline and duration (allP> 0·05). The virus spread to 30 new counties compared to the first wave. The case-fatality rate was 22% in the first wave and 42% in the second (P= 0·023). Of those infected, 66% in the first wave and 62% in the second wave had underlying conditions. The proportion of those exposed to live poultry markets were 80% and 66%, respectively. We recommend permanent closure of live poultry markets and reformation of poultry supply and sales.
A Binary Deletion Channel With a Fixed Number of Deletions
Authors: GRAHAM BENJAMIN 
Published: October 2014

Suppose a binary string x = x1 . . . xn is being broadcast repeatedly over a faulty communication channel. Each time, the channel delivers a fixed number m of the digits (m < n) with the lost digits chosen uniformly at random and the order of the surviving digits preserved. How large does m have to be to reconstruct the message?
A decade of nutrition research in Africa: assessment of the evidence base and academic collaboration
Authors: Lachat Carl , Roberfroid Dominique , Van den Broeck Lien , Van den Briel Natalie , Nago Eunice , Kruger Annamarie , Holdsworth Michelle , Garimoi Orach Christopher , Kolsteren Patrick 
Published: October 2014

AbstractObjectiveMalnutrition in Africa has not improved compared with other regions in the world. Investment in the build-up of a strong African research workforce is essential to provide contextual solutions to the nutritional problems of Africa. To orientate this process, we reviewed nutrition research carried out in Africa and published during the last decade.DesignWe assessed nutrition research from Africa published between 2000 and 2010 from MEDLINE and EMBASE and analysed the study design and type of intervention for studies indexed with major MeSH terms for vitamin A deficiency, protein–energy malnutrition, obesity, breast-feeding, nutritional status and food security. Affiliations of first authors were visualised as a network and power of affiliations was assessed using centrality metrics.SettingAfrica.SubjectsAfricans, all age groups.ResultsMost research on the topics was conducted in Southern (36 %) and Western Africa (34 %). The intervention studies (9 %;n95) mainly tested technological and curative approaches to the nutritional problems. Only for papers on protein–energy malnutrition and obesity did lead authorship from Africa exceed that from non-African affiliations. The 10 % most powerfully connected affiliations were situated mainly outside Africa for publications on vitamin A deficiency, breast-feeding, nutritional status and food security.ConclusionsThe development of the evidence base for nutrition research in Africa is focused on treatment and the potential for cross-African networks to publish nutrition research from Africa remains grossly underutilised. Efforts to build capacity for effective nutrition action in Africa will require forging a true academic partnership between African and non-African research institutions.
A survey of cover crop practices and perceptions of sustainable farmers in North Carolina and the surrounding region
Authors: O'Connell S. , Grossman J.M. , Hoyt G.D. , Shi W. , Bowen S. , Marticorena D.C. , Fager K.L. , Creamer N.G. 
Published: October 2014

AbstractThe environmental benefits of cover cropping are widely recognized but there is a general consensus that adoption levels are still quite low among US farmers. A survey was developed and distributed to more than 200 farmers engaged in two sustainable farming organizations in NC and the surrounding region to determine their level of utilization, current practices and perceptions related to cover cropping. The majority of farms surveyed had diverse crop production, production areas <8 ha, and total gross farm incomes <US$50,000. Approximately one-third of the survey population had an organic production component. Eighty-nine percent of participants had a crop rotation plan and 79% of the total survey population utilized cover cropping. More than 25 different cool- and warm-season cover crops were reported. The statements that generated the strongest agreement about cover crop benefits were that cover crops: increase soil organic matter, decrease soil erosion, increase soil moisture, contribute nitrogen to subsequent cash crops, suppress weeds, provide beneficial insect habitat and break hard pans with their roots. Economic costs associated with cover cropping were not viewed as an obstacle to implementation. A factor analysis was conducted to identify underlying themes from a series of positive and negative statements about cover crops. Pre- and post-management challenges were able to explain the most variability (30%) among participant responses. Overall, participants indicated that the incorporation of residues was their greatest challenge and that a lack of equipment, especially for no-till systems, influenced their decisions about cover cropping. Farmers did not always appear to implement practices that would maximize potential benefits from cover crops.
The association between the rs6495309 polymorphism in CHRNA3 gene and lung cancer risk in Chinese: a meta-analysis
Authors: Xiao Min , Chen Lei , Wu Xiaoling , Wen Fuqiang 
Published: October 2014

AbstractThe association between the rs6495309 polymorphism in CHRNA3 gene and lung cancer risk has been studied in Chinese by several number case-control control studies with small number of cases and controls and these studies might be underpowered to reveal the true association. Thus we sought to investigate the association with the risk of lung cancer by performing a comprehensive meta-analysis on the polymorphism. Five case-control studies were extracted from 3 articles on the polymorphism involving 4608 lung cancer cases and 4617 controls. The results of meta-analysis showed that significant increased risk were found for the polymorphism with the risk of lung cancer in Chinese: OR = 1.47, 95%CI = 1.33–1.63, P < 0.00001 for CC + TC vs. TT; OR = 1.24, 95%CI = 1.07–1.44, P = 0.005 for CC vs. TT + TC; OR = 1.62, 95%CI = 1.32–2.00, P < 0.00001 for CC vs. TT; OR = 1.42, 95%CI = 1.26–1.61, P < 0.00001 for CT vs. TT; OR = 1.42, 95%CI = 1.26–1.61, P < 0.00001. No significant publication bias was found for the five genetic models. Our findings demonstrated that CHRNA3 gene rs6495309 polymorphism might be a risk factor for the development of lung cancer in Chinese.
FFLO Superfluids in 2D Spin-Orbit Coupled Fermi Gases
Authors: Zheng Zhen , Gong Ming , Zhang Yichao , Zou Xubo , Zhang Chuanwei , Guo Guangcan 
Published: October 2014

AbstractWe show that the combination of spin-orbit coupling and in-plane Zeeman field in a two-dimensional degenerate Fermi gas can lead to a larger parameter region for Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phases than that using spin-imbalanced Fermi gases. The resulting FFLO superfluids are also more stable due to the enhanced energy difference between FFLO and conventional Bardeen-Cooper-Schrieffer (BCS) excited states. We clarify the crucial role of the symmetry of Fermi surface on the formation of finite momentum pairing. The phase diagram for FFLO superfluids is obtained in the BCS-BEC crossover region and possible experimental observations of FFLO phases are discussed.
The effect of sample storage on the Peroxidation of Leukocytes Index Ratio (PLIR) measure
Authors: Peluso Ilaria , Manafikhi Husseen , Altieri Fabio , Zanza Christian , Palmery Maura 
Published: October 2014

AbstractDelays in processing are frequent because of problems associated with transporting the samples to the laboratory. Thus, we aimed to evaluate the effect of sample storage on the Peroxidation of Leukocytes Index Ratio (PLIR). Differences between PLIR values of lymphocytes (PLIR-L), monocytes (PLIR-M) and granulocytes (PLIR-G) were observed in fresh samples. Sample storage affected the evaluation of PLIR. In particular, PLIR-L was lower in stored samples compared to fresh samples. In conclusion, our results suggest that fresh samples are recommended for assessing the PLIR.