bluuebunny/crossref_metadata_2025 huggingface dataset:
CMB constraints on the inflaton couplings and reheating temperature in α-attractor inflation
Authors: Drewes Marco , Kang Jin U , Mun Ui Ri
Published: November 2017

Abstract

We study reheating in α-attractor models of inflation in which the inflaton couples to other scalars or fermions. We show that the parameter space contains viable regions in which the inflaton couplings to radiation can be determined from the properties of CMB temperature fluctuations, in particular the spectral index. This may be the only way to measure these fundamental microphysical parameters, which shaped the universe by setting the initial temperature of the hot big bang and contain important information about the embedding of a given model of inflation into a more fundamental theory of physics. The method can be applied to other models of single field inflation.
Inclusive production through AdS/CFT
Authors: Nally Richard , Raben Timothy , Tan Chung-I
Published: November 2017

Abstract

It has been shown that AdS/CFT calculations can reproduce certain exclusive 2→2 cross sections in QCD at high energy, both for near-forward and for fixed-angle scattering. In this paper, we extend prior treatments by using AdS/CFT to calculate the inclusive single-particle production cross section in QCD at high center-of-mass energy. We find that conformal invariance in the UV restricts the cross section to have a characteristic power-law falloff in the transverse momentum of the produced particle, with the exponent given by twice the conformal dimension of the produced particle, independent of incoming particle types. We conclude by comparing our findings to recent LHC experimental data from ATLAS and ALICE, and find good agreement.
On the Weyl anomaly of 4D conformal higher spins: a holographic approach
Authors: Acevedo S. , Aros R. , Bugini F. , Diaz D.E.
Published: November 2017

Abstract

We present a first attempt to derive the full (type-A and type-B) Weyl anomaly of four dimensional conformal higher spin (CHS) fields in a holographic way. We obtain the type-A and type-B Weyl anomaly coefficients for the whole family of 4D CHS fields from the one-loop effective action for massless higher spin (MHS) Fronsdal fields evaluated on a 5D bulk Poincaré-Einstein metric with an Einstein metric on its conformal boundary. To gain access to the type-B anomaly coefficient we assume, for practical reasons, a Lichnerowicz-type coupling of the bulk Fronsdal fields with the bulk background Weyl tensor. Remarkably enough, our holographic findings under this simplifying assumption are certainly not unknown: they match the results previously found on the boundary counterpart under the assumption of factorization of the CHS higher-derivative kinetic operator into Laplacians of “partially massless” higher spins on Einstein backgrounds.
Prediction of the CP asymmetry C00 in $$ {B}^0\to {D}^0\overline{D^0} $$ decay
Authors: Sahoo Dibyakrupa , Cheng Hai-Yang , Chiang Cheng-Wei , Kim C. S. , Sinha Rahul
Published: November 2017

Abstract

Of all

$$ B\to D\overline{D} $$

B
→
D

D
¯

decays, the

$$ {B}^0\to {D}^0\overline{D^0} $$

B
0

→

D
0

D
0

¯

decay has the smallest observed branching ratio as it takes place primarily via the suppressed W-exchange diagram. The CP asymmetry for this mode is yet to be measured experimentally. By exploiting the relationship among the decay amplitudes of

$$ B\to D\overline{D} $$

B
→
D

D
¯

decays (using isospin and topological amplitudes) we are able to relate the CP asymmetries and branching ratios by a simple expression. This enables us to predict the CP asymmetry C
00 in

$$ {B}^0\to {D}^0\overline{D^0} $$

B
0

→

D
0

D
0

¯

. While the predicted central values of C
00 are outside the physically allowed region, they are currently associated with large uncertainties owing to the large errors in the measurements of the

$$ {B}^0\to {D}^0\overline{D^0} $$

B
0

→

D
0

D
0

¯

branching ratio (B
00), the other CP asymmetries C
+− (of B
0 → D
+
D
−) and A
CP (of

$$ {B}^{+}\to {D}^{+}\overline{D^0} $$

B
+

→

D
+

D
0

¯

). With a precise determination of B
00, C
+− and A
CP, one can use our analytical result to predict C
00 with a reduced error and compare it with the experimental measurement when it becomes available. The correlation between B
00 and C
00 is an interesting aspect that can be probed in ongoing and future particle physics experiments such as LHCb and Belle II.
Tensor models, Kronecker coefficients and permutation centralizer algebras
Authors: Geloun Joseph Ben , Ramgoolam Sanjaye
Published: November 2017

Abstract

We show that the counting of observables and correlators for a 3-index tensor model are organized by the structure of a family of permutation centralizer algebras. These algebras are shown to be semi-simple and their Wedderburn-Artin decompositions into matrix blocks are given in terms of Clebsch-Gordan coefficients of symmetric groups. The matrix basis for the algebras also gives an orthogonal basis for the tensor observables which diagonalizes the Gaussian two-point functions. The centres of the algebras are associated with correlators which are expressible in terms of Kronecker coefficients (Clebsch-Gordan multiplicities of symmetric groups). The color-exchange symmetry present in the Gaussian model, as well as a large class of interacting models, is used to refine the description of the permutation centralizer algebras. This discussion is extended to a general number of colors d: it is used to prove the integrality of an infinite family of number sequences related to color-symmetrizations of colored graphs, and expressible in terms of symmetric group representation theory data. Generalizing a connection between matrix models and Belyi maps, correlators in Gaussian tensor models are interpreted in terms of covers of singular 2-complexes. There is an intriguing difference, between matrix and higher rank tensor models, in the computational complexity of superficially comparable correlators of observables parametrized by Young diagrams.
Full action of two deformation operators in the D1D5 CFT
Authors: Carson Zaq , Hampton Shaun , Mathur Samir D.
Published: November 2017

Abstract

We are interested in thermalization in the D1D5 CFT, since this process is expected to be dual to black hole formation. We expect that the lowest order process where thermalization occurs will be at second order in the perturbation that moves us away from the orbifold point. The operator governing the deformation off of the orbifold point consists of a twist operator combined with a supercharge operator acting on this twist. In a previous paper we computed the action of two twist operators on an arbitrary state of the CFT. In the present work we compute the action of the supercharges on these twist operators, thereby obtaining the full action of two deformation operators on an arbitrary state of the CFT. We show that the full amplitude can be related to the amplitude with just the twists through an action of the supercharge operators on the initial and final states. The essential part of this computation consists of moving the contours from the twist operators to the initial and final states; to do this one must first map the amplitude to a covering space where the twists are removed, and then map back to the original space on which the CFT is defined.
Production of vector resonances at the LHC via WZ-scattering: a unitarized EChL analysis
Authors: Delgado R. L. , Dobado A. , Espriu D. , Garcia-Garcia C. , Herrero M. J. , Marcano X. , Sanz-Cillero J. J.
Published: November 2017

Abstract

In the present work we study the production of vector resonances at the LHC by means of the vector boson scattering WZ → WZ and explore the sensitivities to these resonances for the expected future LHC luminosities. We are assuming that these vector resonances are generated dynamically from the self interactions of the longitudinal gauge bosons, W

L
and Z

L
, and work under the framework of the electroweak chiral Lagrangian to describe in a model independent way the supposedly strong dynamics of these modes. The properties of the vector resonances, mass, width and couplings to the W and Z gauge bosons are derived from the inverse amplitude method approach. We implement all these features into a single model, the IAM-MC, adapted for MonteCarlo, built in a Lagrangian language in terms of the electroweak chiral Lagrangian and a chiral Lagrangian for the vector resonances, which mimics the resonant behavior of the IAM and provides unitary amplitudes. The model has been implemented in MadGraph, allowing us to perform a realistic study of the signal versus background events at the LHC. In particular, we have focused our study on the pp → WZjj type of events, discussing first on the potential of the hadronic and semileptonic channels of the final WZ, and next exploring in more detail the most clear signals. These are provided by the leptonic decays of the gauge bosons, leading to a final state with ℓ
1
+
ℓ
1
−
ℓ
2
+
νjj, ℓ = e, μ, having a very distinctive signature, and showing clearly the emergence of the resonances with masses in the range of 1.5–2.5 TeV, which we have explored.
Algebraic cycles and local anomalies in F-theory
Authors: Bies Martin , Mayrhofer Christoph , Weigand Timo
Published: November 2017

Abstract

We introduce a set of identities in the cohomology ring of elliptic fibrations which are equivalent to the cancellation of gauge and mixed gauge-gravitational anomalies in F-theory compactifications to four and six dimensions. The identities consist in (co)homological relations between complex codimension-two cycles. The same set of relations, once evaluated on elliptic Calabi-Yau three-folds and four-folds, is shown to universally govern the structure of anomalies and their Green-Schwarz cancellation in six- and four-dimensional F-theory vacua, respectively. We furthermore conjecture that these relations hold not only within the cohomology ring, but even at the level of the Chow ring, i.e. as relations among codimension-two cycles modulo rational equivalence. We verify this conjecture in non-trivial examples with Abelian and non-Abelian gauge groups factors. Apart from governing the structure of local anomalies, the identities in the Chow ring relate different types of gauge backgrounds on elliptically fibred Calabi-Yau four-folds.
Flavours and infra-red instability in holography
Authors: Kundu Arnab
Published: November 2017

Abstract

With a simple gravitational model in five dimensions, defined by Einstein-gravity with a negative cosmological constant, coupled to a Dirac-Born-Infeld and a Chern-Simons term, we explore the fate of BF-bound violation for a probe scalar field and a fluctuation mode of the corresponding geometry. We assume this simple model to capture the dynamics of a strongly coupled SU(N
c
) gauge theory with N

f
fundamental matter, which in the limit

$$ \mathcal{O}\left({N}_c\right)\sim \mathcal{O}\left({N}_f\right) $$

O

N
c

∼
O

N
f

and with a non-vanishing matter density, is holographically described by an AdS2-geometry in the IR. We demonstrate that, superconductor/superfluid instabilities are facilitated and spontaneous breaking of translational invariance is inhibited with increasing values of (N

f

/N

c
). This is similar, in spirit, with known results in large N

c
Quantum Chromodynamics with N

f
quarks and a non-vanishing density, in which the chiral density wave phase becomes suppressed and superconducting instabilities become favoured as the number of quarks is increased.
Cognitive Diagnosis for Small Educational Programs: The General Nonparametric Classification Method
Authors: Chiu Chia-Yi , Sun Yan , Bian Yanhong
Published: November 2017

The focus of cognitive diagnosis (CD) is on evaluating an examinee’s strengths and weaknesses in terms of cognitive skills learned and skills that need study. Current methods for fitting CD models (CDMs) work well for large-scale assessments, where the data of hundreds or thousands of examinees are available. However, the development of CD-based assessment tools that can be used in small-scale test settings, say, for monitoring the instruction and learning process at the classroom level has not kept up with the rapid pace at which research and development proceeded for large-scale assessments. The main reason is that the sample sizes of the small-scale test settings are simply too small to guarantee the reliable estimation of item parameters and examinees’ proficiency class membership. In this article, a general nonparametric classification (GNPC) method that allows for assigning examinees to the correct proficiency classes with a high rate when sample sizes are at the classroom level is proposed as an extension of the nonparametric classification (NPC) method (Chiu and Douglas in J Classif 30:225–250, 2013). The proposed method remedies the shortcomings of the NPC method and can accommodate any CDM. The theoretical justification and the empirical studies are presented based on the saturated general CDMs, supporting the legitimacy of using the GNPC method with any CDM. The results from the simulation studies and real data analysis show that the GNPC method outperforms the general CDMs when samples are small.
Moderate deviations-based importance sampling for stochastic recursive equations
Authors: Dupuis Paul , Johnson Dane
Published: November 2017

Subsolutions to the Hamilton–Jacobi–Bellman equation associated with a moderate deviations approximation are used to design importance sampling changes of measure for stochastic recursive equations. Analogous to what has been done for large deviations subsolution-based importance sampling, these schemes are shown to be asymptotically optimal under the moderate deviations scaling. We present various implementations and numerical results to contrast their performance, and also discuss the circumstances under which a moderate deviation scaling might be appropriate.
Uniform tail approximation of homogenous functionals of Gaussian fields
Authors: Dȩbicki Krzysztof , Hashorva Enkelejd , Liu Peng
Published: November 2017

Let X(t), t ∈ ℝd, be a centered Gaussian random field with continuous trajectories and set ξu(t) = X(f(u)t), t ∈ ℝd, with f some positive function. Using classical results we can establish the tail asymptotics of ℙ{Γ(ξu) > u} as u → ∞ with Γ(ξu) = supt ∈ [0, T]d ξu(t), T > 0, by requiring that f(u) tends to 0 as u → ∞ with speed controlled by the local behavior of the correlation function of X. Recent research shows that for applications, more general functionals than the supremum should be considered and the Gaussian field can depend also on some additional parameter τu ∈ K say ξu,τu(t), t ∈ ℝd. In this paper we derive uniform approximations of ℙ{Γ(ξu,τu) > u} with respect to τu, in some index set Ku as u → ∞. Our main result has important theoretical implications; two applications are already included in Dȩbicki et al. (2016), (2017). In this paper we present three additional applications. First we derive uniform upper bounds for the probability of double maxima. Second, we extend the Piterbarg–Prisyazhnyuk theorem to some large classes of homogeneous functionals of centered Gaussian fields ξu. Finally, we show the finiteness of generalized Piterbarg constants.
Application of a model of internal hydraulic jumps
Authors: Thorpe S. A. , Malarkey J. , Voet G. , Alford M. H. , Girton J. B. , Carter G. S.
Published: November 2017

A model devised by Thorpe & Li (J. Fluid Mech., vol. 758, 2014, pp. 94–120) that predicts the conditions in which stationary turbulent hydraulic jumps can occur in the flow of a continuously stratified layer over a horizontal rigid bottom is applied to, and its results compared with, observations made at several locations in the ocean. The model identifies two positions in the Samoan Passage at which hydraulic jumps should occur and where changes in the structure of the flow are indeed observed. The model predicts the amplitude of changes and the observed mode 2 form of the transitions. The predicted dissipation of turbulent kinetic energy is also consistent with observations. One location provides a particularly well-defined example of a persistent hydraulic jump. It takes the form of a 390 m thick and 3.7 km long mixing layer with frequent density inversions separated from the seabed by some 200 m of relatively rapidly moving dense water, thus revealing the previously unknown structure of an internal hydraulic jump in the deep ocean. Predictions in the Red Sea Outflow in the Gulf of Aden are relatively uncertain. Available data, and the model predictions, do not provide strong support for the existence of hydraulic jumps. In the Mediterranean Outflow, however, both model and data indicate the presence of a hydraulic jump.
Energy production and self-sustained turbulence at the Kolmogorov scale in Couette flow
Authors: Yang Qiang , Willis Ashley P. , Hwang Yongyun
Published: November 2017

Several recent studies have reported that there exists a self-similar form of invariant solutions down to the Kolmogorov microscale in the bulk region of turbulent Couette flow. While their role in a fully developed turbulent flow is yet to be identified, here we report that there exists a related mechanism of turbulence production at the Kolmogorov microscale in the bulk region of turbulent Couette flow by performing a set of minimal-span direct numerical simulations up to friction Reynolds number $Re_{\unicode[STIX]{x1D70F}}\simeq 800$. This mechanism is found to essentially originate from the non-zero mean shear in the bulk region of the Couette flow, and involves eddy turn-over dynamics remarkably similar to the so-called self-sustaining process (SSP) and/or vortex–wave interaction (VWI). A numerical experiment that removes all other motions except in the core region is also performed, which demonstrates that the eddies at a given wall-normal location in the bulk region are sustained in the absence of other motions at different wall-normal locations. It is proposed that the self-sustaining eddies at the Kolmogorov microscale correspond to those in uniform shear turbulence at transitional Reynolds numbers, and a quantitative comparison between the eddies in uniform shear and near-wall turbulence is subsequently made. Finally, it is shown that turbulence production by the self-sustaining eddies at the Kolmogorov microscale is much smaller than that of full-scale simulations, and that the difference between the two increases with Reynolds number.
Experiments on the structure and scaling of hypersonic turbulent boundary layers
Authors: Williams Owen J. H. , Sahoo Dipankar , Baumgartner Mark L. , Smits Alexander J.
Published: November 2017

Particle image velocimetry and filtered Rayleigh scattering experiments were performed over a range of Reynolds numbers to study the scaling and structure of a smooth, flat-plate turbulent boundary layer with a free stream Mach number of 7.5. The measurements indicate few, if any, dynamic differences due to Mach number. Mean and fluctuating streamwise velocities in the outer layer show strong similarity to incompressible flows at comparable Reynolds numbers when scaled according to van Driest and Morkovin. In addition, correlation lengths and structure angles based on velocity statistics were found to be less sensitive to compressibility than indicated by previous studies based on density fields or mass-weighted statistics, suggesting that the density and velocity fields obey different scaling. Finally, the boundary layer displays uniform momentum zones, with the number of these zones similar to incompressible boundary layers at comparable Reynolds numbers.
Weakly nonlinear theory for oscillating wave surge converters in a channel
Authors: Michele S. , Sammarco P. , d’Errico M.
Published: November 2017

We present a weakly nonlinear theory on the natural modes’ resonance of an array of oscillating wave surge converters (OWSCs) in a channel. We first derive the evolution equation of the Stuart–Landau type for the gate oscillations in uniform and modulated incident waves and then evaluate the nonlinear effects on the energy conversion performance of the array. We show that the gates are unstable to side-band perturbations so that a Benjamin–Feir instability similar to the case of Stokes’ waves is possible. The non-autonomous dynamical system presents period doubling bifurcations and strange attractors. We also analyse the competition of two natural modes excited by one incident wave. For weak damping and power take-off coefficient, the dynamical effects on the generated power of the OWSCs are investigated. We show that the occurrence of subharmonic resonance significantly increases energy production.
Flow structure in healthy and pathological left ventricles with natural and prosthetic mitral valves
Authors: Meschini V. , de Tullio M. D. , Querzoli G. , Verzicco R.
Published: November 2017

In this paper, the structure and the dynamics of the flow in the left heart ventricle are studied for different pumping efficiencies and mitral valve types (natural, biological and mechanical prosthetic). The problem is investigated by direct numerical simulation of the Navier–Stokes equations, two-way coupled with a structural solver for the ventricle and mitral valve dynamics. The whole solver is preliminarily validated by comparisons with ad hoc experiments. It is found that the system works in a highly synergistic way and the left ventricular flow is heavily affected by the specific type of mitral valve, with effects that are more pronounced for ventricles with reduced pumping efficiency. When the ventricle ejection fraction (ratio of the ejected fluid volume to maximum ventricle volume over the cycle) is within the physiological range (50 %–70 %), regardless of the mitral valve geometry, the mitral jet sweeps the inner ventricle surface up to the apex, thus preventing undesired flow stagnation. In contrast, for pathological ejection fractions (⩽40 %), the flow disturbances introduced by the bileaflet mechanical valve reduce the penetration capability of the mitral jet and weaken the recirculation in the ventricular apex. Although in clinical practice the fatality rates in the five-year follow-ups for mechanical and biological mitral valve replacements are essentially the same, a breakdown of the deaths shows that the causes are very different for the two classes of prostheses and the present findings are consistent with the clinical data. This might have important clinical implications for the choice of prosthetic device in patients needing mitral valve replacement.
Unsteady propulsion by an intermittent swimming gait
Authors: Akoz Emre , Moored Keith W.
Published: November 2017

Inviscid computational results are presented on a self-propelled swimmer modelled as a virtual body combined with a two-dimensional hydrofoil pitching intermittently about its leading edge. Lighthill (Proc. R. Soc. Lond.B, vol. 179, 1971, pp. 125–138) originally proposed that this burst-and-coast behaviour can save fish energy during swimming by taking advantage of the viscous Bone–Lighthill boundary layer thinning mechanism. Here, an additional inviscid Garrick mechanism is discovered that allows swimmers to control the ratio of their added-mass thrust-producing forces to their circulatory drag-inducing forces by decreasing their duty cycle,$DC$, of locomotion. This mechanism can save intermittent swimmers as much as 60 % of the energy it takes to swim continuously at the same speed. The inviscid energy savings are shown to increase with increasing amplitude of motion, increase with decreasing Lighthill number,$Li$, and switch to an energetic cost above continuous swimming for sufficiently low$DC$. Intermittent swimmers are observed to shed four vortices per cycle that give rise to an asymmetric time-averaged jet structure with both momentum surplus and deficit branches. In addition, previous thrust and power scaling laws of continuous self-propelled swimming are further generalized to include intermittent swimming. The key is that by averaging the thrust and power coefficients over only the bursting period then the intermittent problem can be transformed into a continuous one. Furthermore, the intermittent thrust and power scaling relations are extended to predict the mean speed and cost of transport of swimmers. By tuning a few coefficients with a handful of simulations these self-propelled relations can become predictive. In the current study, the mean speed and cost of transport are predicted to within 3 % and 18 % of their full-scale values by using these relations.
Turbulence radiation interaction in channel flow with various optical depths
Authors: Silvestri S. , Patel A. , Roekaerts D. J. E. M. , Pecnik R.
Published: November 2017

The present work consists of an investigation of the turbulence radiation interaction (TRI) in a radiative turbulent channel flow of grey gas bounded by isothermal hot and cold walls. The optical thickness $\unicode[STIX]{x1D70F}$ of the channel is varied from 0.1 to 10 to observe different regimes of TRI. A high-resolution finite volume method for radiative heat transfer is employed and coupled with the direct numerical simulation (DNS) of the flow. The resulting effects of TRI on temperature statistics are strongly dependent on the considered optical depth. In particular, the contrasting role of emission and absorption is highlighted. For a low optical thickness the effect of radiative fluctuations on temperature statistics is low and causes the reduction of temperature variance through the dissipating action of emission. On the other hand, while increasing optical thickness to relatively high levels, the dissipation of temperature variance is balanced, at low wavenumbers in the turbulence spectrum, through the preferential action of absorption, which increases the large-scale temperature fluctuations. A significant rise in the effect of radiation on the temperature variance can be observed as a consequence of the reduction of radiative heat transfer length scales.
The wave-induced flow of internal gravity wavepackets with arbitrary aspect ratio
Authors: van den Bremer T. S. , Sutherland B. R.
Published: November 2017

We examine the wave-induced flow of small-amplitude, quasi-monochromatic, three-dimensional, Boussinesq internal gravity wavepackets in a uniformly stratified ambient. It has been known since Bretherton (J. Fluid Mech., vol. 36 (4), 1969, pp. 785–803) that one-, two- and three-dimensional wavepackets induce qualitatively different flows. Whereas the wave-induced mean flow for compact three-dimensional wavepackets consists of a purely horizontal localized circulation that translates with and around the wavepacket, known as the Bretherton flow, such a flow is prohibited for a two-dimensional wavepacket of infinite spanwise extent, which instead induces a non-local internal wave response that is long compared with the streamwise extent of the wavepacket. One-dimensional (horizontally periodic) wavepackets induce a horizontal, non-divergent unidirectional flow. Through perturbation theory for quasi-monochromatic wavepackets of arbitrary aspect ratio, we predict for which aspect ratios which type of induced mean flow dominates. We compose a regime diagram that delineates whether the induced flow is comparable to that of one-, two- or compact three-dimensional wavepackets. The predictions agree well with the results of fully nonlinear three-dimensional numerical simulations.
A tent model of vortex reconnection under Biot–Savart evolution
Authors: Kimura Yoshifumi , Moffatt H. K.
Published: November 2017

Vortex reconnection under Biot–Savart evolution is investigated geometrically and numerically using a tent model consisting of vortex filaments initially in the form of two tilted hyperbolic branches; the vortices are antiparallel at their points of nearest approach. It is shown that the tips of these vortices approach each other, accelerating as they do so to form a finite-time singularity at the apex of the tent. The minimum separation of the vortices and the maximum velocity and axial strain rate exhibit nearly self-similar Leray scaling, but the exponents of the velocity and strain rate deviate slightly from their respective self-similar values of $-1/2$ and $-1$; this deviation is associated with the appearance of distinct minima of curvature leading to cusp structures at the tips. The writhe and twist of each vortex are both zero at all times up to the instant of reconnection. By way of validation of the model, the structure of the eigenvalues and eigenvectors of the rate-of-strain tensor is investigated: it is shown that the second eigenvalue $\unicode[STIX]{x1D706}_{2}$ has dipole structure around the vortex filaments. At the tips, it is observed that $\unicode[STIX]{x1D706}_{2}$ is positive and the corresponding eigenvector is tangent to the filament, implying persistent stretching of the vortex.
Actuator curve embedding – an advanced actuator line model
Authors: Jha Pankaj K. , Schmitz Sven
Published: November 2017

This article describes an actuator curve embedding (ACE) concept to model arbitrary lifting lines using body forces within large-eddy simulation (LES). The new method removes some inconsistencies in body-force projection of the actuator line model (ALM) commonly used to represent wind turbine blades in atmospheric boundary-layer simulations. The concept and algorithm of ACE are presented followed by selected results for various blade planform and tip shapes that signify both the predictive capability and the advantages of the ACE concept. Examples include an elliptic wing, the NREL Phase VI rotor in parked and rotating conditions, and the NREL 5-MW turbine.
LA DATACIÓN RADIOCARBÓNICA DE TABLETAS Y TUBOS DE INHALACIÓN DE LA PAYA (NOROESTE ARGENTINO) Y SU INTEGRACIÓN A OTROS ANÁLISIS ESPECÍFICOS
Authors: Sprovieri Marina
Published: November 2017

Este trabajo integra los datos de una serie de análisis realizados sobre tabletas y tubos procedentes del sitio de La Paya en el Valle Calchaquí, en el Noroeste argentino. Se pone énfasis en los fechados radiocarbónicos y datos contextuales, buscando completar y enriquecer nuestra información sobre la procedencia de las maderas y sobre la vinculación estilística con otras regiones. Los resultados de los fechados, junto con la información contextual, señalan que los artefactos para inhalación de alucinógenos se asocian más fuertemente al período de Desarrollos Regionales en el Valle Calchaquí, con escasa vinculación a contextos Inkaicos. Esto indicaría que los circuitos que permitieron el aprovisionamiento de maderas de otras regiones para algunas de las tabletas y tubos calchaquíes se encontraban vigentes para dicho período. Lo mismo sucedía para aquella esfera por la que circuló información estilística relativa a tabletas y tubos, que abarcó las áreas del Valle Calchaquí, la puna de Jujuy, la Quebrada de Humahuaca y la región del Río Loa.
Vance and Nettie Palmer in Caloundra, 1925–29
Authors: Jordan Deborah
Published: November 2017

Vance and Nettie Palmer were among Australia’s most important literary partnerships. Previous accounts of their life and work underplay their commitment to the creation of an environmental imagination. After the trauma and disillusion of the Great War, they lived in Caloundra from 1925 to 1929 (and from then had an ongoing connection). While it is generally acknowledged how important their time there was in terms of Vance’s emerging work in literary fiction, and through Nettie’s work as a freelance journalist, what has not been addressed is their extraordinary environmental writings about the region. Regional writings were largely dismissed in the 1990s as of comparative insignificance to national narratives — just as today the reputation of the inter-war writers, those associated with the Palmers, is at a low ebb. During the 1920s, Nettie developed critical categories to accommodate a double standard in Australian writing: regional and universal literature. She went on to argue for the support of writing in Australia at the regional level. Vance reflected on his explorations of place directly in a series of articles. This paper reframes the Palmers’ Caloundra work in the ‘bio-regional’ terms of climate change and the historical cultural imaginary.
The sea will be there
Authors: Ferres Kay
Published: November 2017

According to Judith Wright, John Blight’s best poems were about the sea. From the 1940s, when he lived around the Sunshine Coast, he wrote about the rhythms of life by the sea and about human relationships with the more than human world. In the 1960s, he published 180 sonnets in two volumes, A Beachcomber’s Diary and My Beachcombing Days. The sonnet form, he said, cut him down to size. This paper considers Blight’s work and its engagement with the littoral zone: the seascapes and ecology of the Sunshine Coast. It attempts to hear the sea’s voices — muffled, indistinct — and to illuminate Blight’s ideas about its alien nature.
Going underground on the Sunshine Coast
Authors: Hassall Tony
Published: November 2017

Peter Carey has said of his 2008 novel, His Illegal Self, that it grew from an image he recalled of a hippie mother and her son wandering along the edge of the Bruce Highway near Caboolture, and an American who arrived in his commune near Yandina who turned out to be a drug dealer wanted by the FBI. In typical Carey fashion, the three central characters in His Illegal Self are in the process of escaping from the narratives that have been imposed upon them, and metamorphosing into different and better selves. His Illegal Self is the first of Carey’s books in which he reverses the angle of vision on the cross-cultural comparison of Australia and America that has engaged him throughout his career. This reverse comparison is set some thirty-five years in the past, against a background of the protest movements against the Vietnam War in both countries. Unlike several of his earlier novels, His Illegal Self lacks a pronounced sense of self-conscious storytelling, and this increases the direct emotional impact of the novel, intensifying the reader’s empathy with the characters’ emergence from their imposed identities.
W/rites of passion
Authors: Taylor Cheryl
Published: November 2017

During 1947 and 1948, Thea Astley’s life changed in ways that permanently affected her writing. In August 1947, she obtained a transfer to Imbil State School, west of Noosa. In November she re-sat failed University of Queensland exams in economics and history, and graduated with a BA in the following April. In January 1948, Astley took up a secondary teaching post at Pomona Rural High. On 27 August, she married Jack Gregson at the Gympie Registry Office. She transferred to Brisbane for the remainder of 1948, and early in the New Year moved with her husband to Sydney. This article contrasts poetry about love and place that Astley wrote during these transition years with the themes and tone of her novel, A Descant for Gossips, published in 1960 and set in Pomona (‘Gungee’) and its environs. Dedicated ‘To John’, Astley’s love poems display a passionate lyricism and a commitment that, though usually nervous and conditional, encompasses moments of settled happiness and clarity. In Descant, by contrast, moments of fulfilment in the love affair of teachers Helen Striebel and Robert Moller are suffused with guilt. Similarly, Astley’s youthful response in her poetry to the beauty of the ranges and the coast collapses a decade later in Descant into a dystopic rendition of Gungee as a town that punishes defiance and crucifies difference. The article concludes by speculating about causes for the transformation.
Nancy Cato at Noosa
Authors: Sheridan Susan
Published: November 2017

Nancy Cato (1917–2000) was born in Adelaide and lived there for the first half of her life. Moving to Noosa in 1967, she became known for environmental activism as well as her writing. Through research for her historical novels set in Tasmania and on the Murray River, as well as her travels in Central and Northern Australia, she developed a strong interest in Aboriginal and Torres Strait Islander peoples. She published poetry, stories, plays and journalism, as well as novels set in the Northern Territory, North Queensland, the Riverland and Tasmania. She had a painter’s eye as well as a gift for lyrics and a lifelong interest in storytelling. With the emergence of eco-criticism, we can now see her diverse career as a writer as cohering around her love of the natural world and her curiosity about how human beings lived in it. This article considers her writing about her adopted country around Noosa.
Craig Munro, 'Under Cover: Adventures in the Art of Editing', Melbourne: Scribe, 2015, 256 pp., ISBN 9 7819 2510 6756, A$29.99
Authors: Ferres Kay
Published: November 2017

Craig Munro, Under Cover: Adventures in the Art of Editing, Melbourne: Scribe, 2015, 256 pp., ISBN 9 7819 2510 6756, A$29.99
Matthew J. Colloff, 'Flooded Forest and Desert Creek: Ecology and History of the River Red Gum', Melbourne: CSIRO Publishing, 2014, 325 pp., ISBN 9 7806 4310 9193, A$69.95
Authors: May Daniel
Published: November 2017

Matthew J. Colloff, Flooded Forest and Desert Creek: Ecology and History of the River Red Gum, Melbourne: CSIRO Publishing, 2014, 325 pp., ISBN 9 7806 4310 9193, A$69.95
DEVOLUTION AND DISCRIMINATION BETWEEN CITIZENS UNDER ARTICLE 14 ECHR: PRESERVING LOCAL PROVISION
Authors: Cochrane Leanne
Published: November 2017

Many women from Northern Ireland (NI) travel to England each year to pay for abortion services because of the limited availability of the service in NI. In R (on the application of A and B) (Appellants) v Secretary of State for Health (Respondent) [2017] UKSC 41; [2017] 1 W.L.R. 2492, the Supreme Court was asked whether it was unlawful for the Secretary of State for Health to have failed to make provision for abortion services free of charge under the National Health Service in England to women who are UK citizens usually resident in NI. The majority answered “no” and, on delivering the judgment, Lord Wilson (for the majority) described the Court as “sharply divided” on both the public law and human rights arguments that had been before it.
INDIRECT ENRICHMENT IN THE SUPREME COURT
Authors: Shah Rajiv
Published: November 2017

A customer purchases services from a supplier to which VAT at the applicable rate is added but VAT was not actually due. Is the customer able to recover these payments by bringing an unjust enrichment claim against the Revenue and Customs Commissioners? “Yes”, answered the Court of Appeal, on the basis that as a matter of “economic reality” the Commissioners were enriched at the expense of the customers, and that such an enrichment was unjust because VAT was not actually due. Lord Reed, giving the unanimous judgment of the Supreme Court, reversed that decision: Investment Trust Companies (In Liquidation) v Revenue and Customs Commissioners [2017] UKSC 29; [2017] 2 W.L.R. 1200. The customers did not have an unjust enrichment claim against the Commissioners because their enrichment was not “at the expense of” the customers.
THE SHIFTING SANDS OF UK TAX LAW
Authors: Mulley Guy
Published: November 2017

When the law is confusing, when the efforts of HM Revenue & Customs (“HMRC”) seem ineffective and when an impecunious state needs higher tax yields, what better time could there be for the Supreme Court to invoke the populist battle cry “tax avoidance” and to head for the “right” decision? Perhaps, it is respectfully suggested, when the (reasoning) means can justify the (judgmental) ends.
Development of Spanish rhotics in Spanish–English bilingual children in the United States
Authors: MENKE Mandy R.
Published: November 2017

Rhotics, particularly the trill, are late acquired sounds in Spanish. Reports of Spanish–English bilingual preschoolers document age-appropriate articulations, but studies do not explore productions once exposure to English increases. This paper reports on the rhotic productions of a cross-sectional sample of 31 Spanish–English bilingual children, ages 6;8 to 13;5. Children produced taps with high rates of accuracy across age groups; the trill did not reach 80% target production until age 11;3, later than reported for monolingual speakers. Increased English exposure is explored as a contributing factor, arguing a need for continued study of bilingual phonological development beyond the preschool years.
Hepatitis E virus infection in North Italy: high seroprevalence in swine herds and increased risk for swine workers
Authors: MUGHINI-GRAS L. , ANGELONI G. , SALATA C. , VONESCH N. , D'AMICO W. , CAMPAGNA G. , NATALE A. , ZULIANI F. , CEGLIE L. , MONNE I. , VASCELLARI M. , CAPELLO K. , DI MARTINO G. , INGLESE N. , PALÙ G. , TOMAO P. , BONFANTI L.
Published: November 2017

We determined the hepatitis E virus (HEV) seroprevalence and detection rate in commercial swine herds in Italy's utmost pig-rich area, and assessed HEV seropositivity risk in humans as a function of occupational exposure to pigs, diet, foreign travel, medical history and hunting activities. During 2011–2014, 2700 sera from 300 swine herds were tested for anti-HEV IgG. HEV RNA was searched in 959 faecal pools from HEV-seropositive herds and in liver/bile/muscle samples from 179 pigs from HEV-positive herds. A cohort study of HEV seropositivity in swine workers (n = 149) was also performed using two comparison groups of people unexposed to swine: omnivores (n = 121) and vegetarians/vegans (n = 115). Herd-level seroprevalence was 75·6% and was highest in farrow-to-feeder herds (81·6%). Twenty-six out of 105 (24·8%) herds had HEV-positive faecal samples (25 HEV-3, one HEV-4). Only one bile sample tested positive. HEV seropositivity was 12·3% in swine workers, 0·9% in omnivores and 3·0% in vegetarians/vegans. Factors significantly associated with HEV seropositivity were occupational exposure to pigs, travel to Africa and increased swine workers’ age. We concluded that HEV is widespread in Italian swine herds and HEV-4 circulation is alarming given its pathogenicity, with those occupationally exposed to pigs being at increased risk of HEV seropositivity.
In-row Vegetation-free Strip Width Effect on Established ‘Navaho’ Blackberry
Authors: Basinger Nicholas T. , Jennings Katherine M. , Monks David W. , Mitchem Wayne E. , Perkins-Veazie Penelope M. , Chaudhari Sushila
Published: November 2017

A field study was conducted in 2014 and 2015 in an established 5-yr old commercial blackberry planting to determine the effect of vegetation-free strip width (VFSW) on ‘Navaho’ blackberry vegetative growth, yield and fruit quality parameters, identify the optimum VFSW for blackberry plantings in the southeastern USA, and provide practical groundcover management recommendations that can increase the productivity of blackberry plantings. In Fall 2013, tall fescue was seeded in-row and allowed to establish. In Spring 2014, VFSW treatments (0, 0.6, 0.9, 1.2, and 1.8 m) were established in a randomized complete block statistical design with four replications. Blackberry growth measurements included primocane and floricane number, cane diam, individual fruit weight and yield. Fruit quality measurements included, soluble solids concentration (SSC), titratable acidity (TA) and pH. Primocane number increased with increasing VFSW in both years. Floricane number increased with increasing VFSW in 2014. Primocane diam decreased with increasing VFSW in 2014 but had a quadratic response in 2015. Berry weight and cumulative yield increased with increasing VFSW in both years. The only berry quality component affected by VFSW was pH, which decreased as VFSW increased. Results indicate that widening the VFSW in blackberry from the current recommendation of 1.2 m to 1.8 m could provide growers a means to increase plant growth, berry weight, and cumulative yield blackberry of a planting.
Cool-Season Weed Control Using Ammonium Nonanoate and Cultivation in Organic Vidalia® Sweet Onion Production
Authors: Johnson W. Carroll , Luo Xuelin
Published: November 2017

Ammonium nonanoate is registered for weed control in certified organic cropping systems and may be useful to control cool-season weeds in organic Vidalia® sweet onion production. Ammonium nonanoate combined with tine-weeder cultivation was evaluated for weed control in organic onion in Georgia. There were no statistical interactions between main effects of herbicides and cultivation with a tine weeder for cool-season weed control and onion yield, indicating that ammonium nonanoate does not improve weed control compared with cultivation. Ammonium nonanoate at 4% and 6% did not adequately control weeds and onion yields were reduced. Ammonium nonanoate at 8% and 10% controlled cutleaf evening-primrose and lesser swinecress equal to the standard of d-limonene (14%), but the degree of control did not consistently protect onion yields from losses due to weeds. These results are in agreement with previous studies using clove oil and pelargonic acid. There is no advantage to using ammonium nonanoate for cool-season weed control in organic Vidalia® sweet onion production.
Suizidprävention in der Klinik Nette-Gut für Forensische Psychiatrie
Authors: Kuhlmann Barbara
Published: November 2017

Zusammenfassung. Auch wenn es selbst unter optimalen Bedingungen keine absolut sichere Suizidprävention gibt, so ist die Einschätzung der Suizidalität und der individuell geplante Umgang mit suizidalen Patienten notwendig, um zu verhindern, dass Patienten Suizidideen in Suizidabsichten und Suizidhandlungen umsetzen. Darüber hinaus dienen strukturelle, fest implementierte Maßnahmen dazu die Mitarbeiter, von denen die Pflegedienstmitarbeiter den überwiegenden Teil darstellen, zu unterstützen und zu entlasten. Die Maßnahmen tragen dazu bei, suizidale Krisen bei Patienten frühzeitig zu erkennen, individuelle Maßnahmen ressourcenorientiert durchzuführen sowie offen mit den Patienten über das Thema „Suizid, Hoffnung und Perspektiven“ zu sprechen.
Das Gezeitenmodell
Authors: Buelacher David
Published: November 2017

Zusammenfassung. Das Leben ist eine Reise, die über einen Ozean der Erfahrung führt. Jede Form der menschlichen Entwicklung, einschließlich der Erfahrung von Gesundheit und Krankheit, beinhaltet Entdeckungen auf der Reise über jenen Ozean der Erfahrung (Barker 2003, S. 161).
Mystery Quakes May Be Among World’s Longest-Lived Aftershocks
Authors: Loomis Ilima
Published: November 2017

New evidence about where a major earthquake struck central Washington State 145 years ago raises the possibility that today’s unusually frequent quakes in the area still echo that 1872 event.