bluuebunny/crossref_metadata_2025_split huggingface dataset:
Evaluating airsoft electric guns for control of invasive brown treesnakes
Authors: Knox Adam J. , Lardner Björn , Yackel Adams Amy , Reed Robert N. 
Published: September 2018

ABSTRACTFirearms are often used in lethal control of invasive vertebrates, but safety and regulatory aspects limit the circumstances under which they can be used. During August 2016 at the Brown Treesnake Project laboratory on Guam, we evaluated hobby‐grade Airsoft Electric Guns (AEGs)—a lower powered, less‐hazardous, and less‐regulated alternative to firearms—for capture and control of small animals, with specific emphasis on invasive brown treesnakes (Boiga irregularis). Tests of AEGs differing in power with ammunition (plastic pellets) masses ranging from 0.20 to 0.39 g, fired at gelatin blocks from distances of 4, 8, and 12 m, showed that heavy ammunition is of overriding importance for maximizing lethality: 0.39‐g pellets penetrated more deeply at 12 m than did 0.20‐g pellets at 4 m. Inspection of tissue damage in brown treesnake carcasses subjected to fire with the 0.39‐g ammunition from the same distances suggested that injuries sustained by a direct hit from 12 m would often be lethal, and snakes would be unlikely to survive multiple hits from automatic fire discharged at approximately 17/s. Limited trials with live snakes helped us to understand behavioral responses in a snake hit by ≥1 pellets, including distance traveled over time. Based on these factors, we assessed the risk that a snake injured by pellet fire might evade subsequent capture by rapid responders in the proximity. We also discuss ethical considerations and regulatory advantages of using AEGs. Published 2018. This article is a U.S. Government work and is in the public domain in the USA.
A refined two‐dimensional theory for thermal bending of functionally graded plates with thickness normal strains
Authors: Fares M. E. , Elmarghany M. Kh. , Atta Doaa , Salem A. G. 
Published: September 2018

AbstractA refined theory is presented for the thermal response of composite functionally graded plates under thermo‐mechanical loads. The theory includes shear deformation and normal strain effects by assuming through‐the‐thickness linear in‐plane displacements and parabolic transverse displacement. A mixed variational approach is used to introduce stresses satisfying the loading conditions on the plate surfaces without employing any shear correction factor used in other theories of the same order. A thermal bending problem is solved for metal/ceramic rectangle plates. Some numerical results are compared with numerical results of 3D exact solutions. The importance of the normal strain effect for such problems is studied.
Supersymmetric Galilean conformal blocks
Authors: Lodato Ivano , Merbis Wout , Zodinmawia  
Published: September 2018

AbstractWe set up the bootstrap procedure for supersymmetric Galilean Conformal (SGC) field theories in two dimensions by constructing the SGC blocks in the$$ \mathcal{N}=1 $$N=1and two possible$$ \mathcal{N}=2 $$N=2extensions of the Galilean conformal algebra. In all analyzed cases, we present the bootstrap equations by crossing symmetry of the four point function. In addition, we compute the global SGC blocks analytically by solving the differential equations obtained by acting with the Casimirs of the global subalgebras inside the four point function. These global blocks agree with the general SGC blocks in the limit of large central charge. We comment on possible applications to supersymmetric BMS3invariant field theories and flat holography.
Neyman-type sample allocation for domains-efficient estimation in multistage sampling
Authors: Khan M. G. M. , Wesołowski Jacek 
Published: September 2018

Abstract
We consider a problem of allocation of a sample in two- and three-stage sampling. We seek allocation which is both multi-domain and population efficient. Choudhry et al. (Survey Methods 38(1):23–29, 2012) recently considered such problem for one-stage stratified simple random sampling without replacement in domains. Their approach was through minimization of the sample size under constraints on relative variances in all domains and on the overall relative variance. To attain this goal, they used nonlinear programming. Alternatively, we minimize here the relative variances in all domains (controlling them through given priority weights) as well as the overall relative variance under constraints imposed on total (expected) cost. We consider several two- and three-stage sampling schemes. Our aim is to shed some light on the analytic structure of solutions rather than in deriving a purely numerical tool for sample allocation. To this end, we develop the eigenproblem methodology introduced in optimal allocation problems in Niemiro and Wesołowski (Appl Math 28:73–82, 2001) and recently updated in Wesołowski and Wieczorkowski (Commun Stat Theory Methods 46(5):2212–2231, 2017) by taking under account several new sampling schemes and, more importantly, by the (single) total expected variable cost constraint. Such approach allows for solutions which are direct generalization of the Neyman-type allocation. The structure of the solution is deciphered from the explicit allocation formulas given in terms of an eigenvector

$${\underline{v}}^*$$

v
̲

∗

of a population-based matrix

$$\mathbf{D}$$

D

. The solution we provide can be viewed as a multi-domain version of the Neyman-type allocation in multistage stratified SRSWOR schemes.
Design optimisation of separate-jet exhausts for the next generation of civil aero-engines
Authors: Goulos I. , Otter J. , Stankowski T. , Macmanus D. , Grech N. , Sheaf C. 
Published: September 2018

ABSTRACTThe next generation of civil large aero-engines will employ greater bypass ratios compared with contemporary architectures. This results in higher exchange rates between exhaust performance and specific fuel consumption (SFC). Concurrently, the aerodynamic design of the exhaust is expected to play a key role in the success of future turbofans. This paper presents the development of a computational framework for the aerodynamic design of separate-jet exhaust systems for civil aero-engines. A mathematical approach is synthesised based on class-shape transformation (CST) functions for the parametric geometry definition of gas-turbine exhaust components such as annular ducts and nozzles. This geometry formulation is coupled with an automated viscous and compressible flow solution method and a cost-effective design space exploration (DSE) approach. The framework is deployed to optimise the performance of a separate-jet exhaust for very-high-bypass ratio (VHBR) turbofan engine. The optimisations carried out suggest the potential to increase the engine’s net propulsive force compared with a baseline architecture, through optimum exhaust re-design. The proposed method is able to identify and alleviate adverse flow-features that may deteriorate the aerodynamic behaviour of the exhaust system.
Difference in snowmelt processes between an opening and three Japanese cedar stands
Authors: Murakami Shigeki , Takeuchi Yukari 
Published: September 2018

AbstractSnowmelt was measured on a daily basis for 17 days at the open site and 18 days at three Japanese cedar sites with canopy closure of 17.8% (cedar stand A), 5.2% (B) and 2.4% (C) in April. Measured daily snowmelt at each site was reproduced by heat-balance calculation with an accuracy of <±1 mm w.e. From 1st April to the date of snow disappearance net radiation accounted for 88.4, 43.0, 32.7 and 34.2% of total snowmelt energy at the open site, the cedar stands A, B and C, respectively. The ratio of sensible and latent heat to total snowmelt was 33.1–37.9 and 25.9–29.4%, respectively, at three cedar stands. The ratios of sensible and latent heat increased over time in accordance with the rise in temperature at all cedar sites. They became large on a daily basis when air temperature and/or wind speed were high. Wind speed is dependent on morphology around each site that also dictated snowmelt.
Modal analysis of the wake past a marine propeller
Authors: Magionesi Francesca , Dubbioso Giulio , Muscari Roberto , Di Mascio Andrea 
Published: September 2018

Modal decomposition techniques are used to analyse the wake field past a marine propeller achieved by previous numerical simulations (Muscariet al. Comput. Fluids, vol. 73, 2013, pp. 65–79). In particular, proper orthogonal decomposition (POD) and dynamic mode decomposition (DMD) are used to identify the most energetic modes and those that play a dominant role in the inception of the destabilization mechanisms. Two different operating conditions, representative of light and high loading conditions, are considered. The analysis shows a strong dependence of temporal and spatial scales of the process on the propeller loading and correlates the spatial shape of the modes and the temporal scales with the evolution and destabilization mechanisms of the wake past the propeller. At light loading condition, due to the stable evolution of the wake, both POD and DMD describe the flow field by the non-interacting evolution of the tip and hub vortex. The flow is mainly associated with the ordered convection of the tip vortex and the corresponding dominant modes, identified by both decompositions, are characterized by spatial wavelengths and frequencies related to the blade passing frequency and its multiples, whereas the dynamic of the hub vortex has a negligible contribution. At high loading condition, POD and DMD identify a marked separation of the flow field close to the propeller and in the far field, as a consequence of wake breakdown. The tonal modes are prevalent only near to the propeller, where the flow is stable; on the contrary, in the transition region a number of spatial and temporal scales appear. In particular, the phenomenon of destabilization of the wake, originated by the coupling of consecutive tip vortices, and the mechanisms of hub–tip vortex interaction and wake meandering are identified by both POD and DMD.
Fluid deformation in random steady three-dimensional flow
Authors: Lester Daniel R. , Dentz Marco , Le Borgne Tanguy , de Barros Felipe P. J. 
Published: September 2018

The deformation of elementary fluid volumes by velocity gradients is a key process for scalar mixing, chemical reactions and biological processes in flows. Whilst fluid deformation in unsteady, turbulent flow has gained much attention over the past half-century, deformation in steady random flows with complex structure – such as flow through heterogeneous porous media – has received significantly less attention. In contrast to turbulent flow, the steady nature of these flows constrains fluid deformation to be anisotropic with respect to the fluid velocity, with significant implications for e.g. longitudinal and transverse mixing and dispersion. In this study we derive an ab initio coupled continuous-time random walk (CTRW) model of fluid deformation in random steady three-dimensional flow that is based upon a streamline coordinate transform which renders the velocity gradient and fluid deformation tensors upper triangular. We apply this coupled CTRW model to several model flows and find that these exhibit a remarkably simple deformation structure in the streamline coordinate frame, facilitating solution of the stochastic deformation tensor components. These results show that the evolution of longitudinal and transverse fluid deformation for chaotic flows is governed by both the Lyapunov exponent and power-law exponent of the velocity probability distribution function at small velocities, whereas algebraic deformation in non-chaotic flows arises from the intermittency of shear events following similar dynamics as that for steady two-dimensional flow.
Testing the Use of δ2H Values for Reservoir Corrections in Radiocarbon Dating Human Bone
Authors: van der Sluis L G , Ogle N , Reimer P J 
Published: September 2018

AbstractConsumption of marine protein in humans and animals can result in an apparent older radiocarbon (14C) age due to reservoir offsets. In order to correct for this, an estimate of the marine protein intake should be used to correct the 14C age for reservoir offsets, which is ordinarily done using δ13C or δ15N values. However, these two isotopic proxies can be influenced by a number of factors which can hamper estimation of the correct marine protein intake. A small dataset of 12 samples from the Limfjord, Denmark, ranging in age from Mesolithic to Viking Age, was used to test the use of δ2H values to quantify marine protein intake and determine the reservoir corrections. Each of the three stable isotopic values (δ2H, δ13C, δ15N) was used to estimate the percent marine protein intake, which produced three different calibrated 14C ages. The calculated percent marine protein intake differed between the use of the stable isotopic ratios with a maximum difference of 42.1% between the use of δ15N and δ13C, 23.8% between δ2H and δ13C, and 46.2% between δ2H and δ15N. In some cases the calculated percent marine protein intake changed the sample’s archaeological period, although there was generally still overlap in the archaeological periods for samples used in this study.
Honour Among (Cyber)thieves?
Authors: Lusthaus Jonathan 
Published: September 2018

AbstractIt is well known that criminals, who operate outside the law and the protection of the state, face difficulties in cooperating due both to the requirement of secrecy and a deficit of trust. For cybercriminals the anonymity of the Internet creates further challenges, making it even more difficult to assess trustworthiness and enforce agreements. Yet, contrary to expectations, collaboration among cybercriminals is prevalent, and a sophisticated industry has emerged. The purpose of this paper is to address this puzzle in relation to profit-driven cybercrime. It draws on a collection of interviews with former cybercriminals that provide a valuable form of data on micro-level and often secretive interactions. It examines four key mechanisms that lead to improved cooperation: reputation, appearance, performance and enforcement. It also addresses the rarely discussed, and somewhat counterintuitive, role that offline interactions may play in enhancing collective action among cybercriminals.
ON THE AXIOMATIZABILITY OF C*-ALGEBRAS AS OPERATOR SYSTEMS
Authors: GOLDBRING ISAAC , SINCLAIR THOMAS 
Published: September 2018

AbstractWe show that the class of unital C*-algebras is an elementary class in the language of operator systems and that the algebra multiplication is a definable function in this language. Moreover, we prove a general model theoretic fact which implies that the aforementioned class is ∀∃∀-axiomatizable. We conclude by showing that this class is, however, neither ∀∃-axiomatizable nor ∃∀-axiomatizable.
Monitoring of greenhouse gas emissions from farm-scale anaerobic piggery waste-water digesters
Authors: Su Jung-Jeng , Chen Yen-Jung 
Published: September 2018

AbstractPig manure management systems in Taiwan differ from the model representing the Asian region developed by the Intergovernmental Panel on Climate Change (IPCC). The current study was undertaken to update greenhouse gas (GHG) emission factors of anaerobically treated piggery waste water by operating the conventional three-step piggery waste-water treatment system from selected pig farms located in northern, central and southern Taiwan. Biogas mass flow meters were installed to the outlet of anaerobic basins prior to the biogas pressure stabilizers for direct and reliable biogas measurement. The analytic results showed that average GHG emissions were 0.088, 0.128 and 0.066 m3/head/day in the northern, central and southern pig farms, respectively. Thus, the average emission levels of methane and nitrous oxide were 14.38 and 0.055 kg/head/year, respectively, from anaerobic digestion of piggery waste water for the three pig farms. The average removal efficiency of chemical oxygen demand, biochemical oxygen demand and suspended solids by anaerobic digestion process from the three pig farms was about 77, 93 and 70%, respectively.
Beyond Pessimism: A Structure of Encouragement in Augustine'sCity of God
Authors: Lamb Michael 
Published: September 2018

AbstractMany critics of Augustine target his “pessimism,” arguing that his fixation on evil denies the value of this-worldly goods. This article challenges this view by exposing a methodological assumption that often underwrites it—the idea that Augustine's texts can be abstracted from their rhetorical contexts. To illustrate, I offer a close reading ofCity of God22.22–24, a passage frequently cited as evidence of Augustine's pessimism. By analyzing how Augustine uses rhetoric to “instruct” and “encourage” his readers, I argue instead that this passage should be interpreted as an exercise of hope that helps readers resist temptations toward presumption and despair. This account complicates the common binary between optimism and pessimism and supplies a novel interpretation of key passages inCity of God.
Type synthesis of legged mobile landers with one passive limb using the singularity property
Authors: Lin Rongfu , Guo Weizhong , Chen Xianbao , Li Meng 
Published: September 2018

SUMMARYDuring extraterrestrial planetary exploration programs, autonomous robots are deployed using a separate immovable lander and a rover. This mode has some limitations. In this paper, a concept of a novel legged robot with one passive limb and singularity property is introduced that has inbuilt features of a lander and a rover. Currently, studies have focused primarily on a performance analysis of the lander without a walking function. However, a systematic type synthesis of the legged mobile lander has not been studied. In this study, a new approach to the type synthesis used for the robot is proposed based on the Lie group theory. The overall concept and design procedures are proposed and described. The motion requirements of the robot and its legs, which are corresponding to the multi-function, are extracted and described. The layouts of the subgroups or submanifolds of the limbs are determined. The structures of the passive and actuated limbs are synthesized. Numerous structures of the legs with a passive limb are produced and listed corresponding to the desired displacement manifolds. Numerous novel structures of legs for the legged mobile lander are presented and listed. Then, four qualitative criteria or indexes are introduced. Based on the proposed criteria, a leg's configuration is selected as the best. A typical structure of the legged mobile lander is obtained by assembling the structures of the proposed legs. Finally, the typical robot is used as an example to verify the capabilities of the novel robot using a software simulation (ADAMS).
A formation maneuvering controller for multiple non-holonomic robotic vehicles
Authors: Khaledyan Milad , de Queiroz Marcio 
Published: September 2018

SUMMARYIn this paper, we present a new leader–follower type solution to the translational maneuvering problem for formations of multiple, non-holonomic wheeled mobile robots. The solution is based on the graph that models the coordination among the robots being a spanning tree. Our control law incorporates two types of position errors: individual tracking errors and coordination errors for leader–follower pairs in the spanning tree. The control ensures that the robots globally acquire a given planar formation while the formation as a whole globally tracks a desired trajectory, both with uniformly ultimately bounded errors. The control law is first designed at the kinematic level and then extended to the dynamic level. In the latter, we consider that parametric uncertainty exists in the equations of motion. These uncertainties are accounted for by employing an adaptive control scheme. The main contributions of this work are that the proposed control scheme minimizes the number of control links and global position measurements, and accounts for the uncertain vehicle dynamics. The proposed formation maneuvering controls are demonstrated experimentally and numerically.
Reimagining the Nation-State: Indigenous Peoples and the Making of Plurinationalism in Latin America
Authors: MERINO ROGER 
Published: September 2018

AbstractIn the last two decades, the concept of plurinationalism has appeared in discussions about nationalism, statehood and multilevel governance, being formulated as a new state model that accommodates cultural diversity within the liberal state with the aim of solving nationalistic conflicts in countries marked by profound ethnic grievances, mainly in Europe. However, these discussions have paid less attention to the meaning of plurinationalism in ex-colonial contexts, particularly in recent experiences of state transformation in Bolivia and Ecuador, where the role of indigenous peoples in the plurinational project has been crucial. To fill this gap, this article explores the legal and political foundations, challenges and local and international dynamics in the building of the plurinational model in both countries. Under a critical engagement with Third World Approaches to International Law (TWAIL), this article argues that plurinationality from indigenous perspectives departs from multicultural liberal models associated with current European plurinational views, and addresses two challenges: a global political economy of resource extraction, and a racialized state structure working as a barrier to actual plurinational implementation. These limitations explain an intrinsic tension in the Bolivian and Ecuadorian experience: on the one hand, plurinational governments try to unify the people around the ‘national interest’ of developing extractive industries; and on the other hand, they attempt to recognize ethno-political differences that often challenge the transnational exploitation of local resources.
African International Legal Histories – International Law in Africa: Perspectives and Possibilities
Authors: ZOLLMANN JAKOB 
Published: September 2018

AbstractHitherto, the ‘African part’ of the history of international law has often been limited to the (critical engagement with) ‘the acquisition of Africa’ since the 1880s and questions of ‘state succession’ and international borders following independence starting in the 1950s. In this historical narrative, the dominance of colonialism is evident. It seems that ‘Africa’ as a narrative concept in international legal history remains tied to abstract contrasts such as ‘foreign domination’ versus ‘independence’, or ‘exploitation’ versus ‘development’. However, if twenty-first century writings about ‘international law in Africa’ and its histories remain shaped by this perspective, historians may lose sight of issues, questions, or ideas formed in historical Africa that do not fit into this preconceived dichotomous matrix. After discussing methodological challenges, this article asks for other ‘contacts’, other arenas of ‘internationality’ and international law in Africa’s pre-colonial past. These contacts reach back very far in history. Three arenas are mentioned: the Red Sea area and Ethiopian-Arab relations; the Indian Ocean rim; and finally, the case of nineteenth-century Ethiopia.