bluuebunny/crossref_metadata_2025_split huggingface dataset:
Drop impact entrapment of bubble rings
Authors: Thoraval M.-J. , Takehara K. , Etoh T. G. , Thoroddsen S. T. 
Published: April 2013

AbstractWe use ultra-high-speed video imaging to look at the initial contact of a drop impacting on a liquid layer. We observe experimentally the vortex street and the bubble-ring entrapments predicted numerically, for high impact velocities, by Thoraval et al. (Phys. Rev. Lett., vol. 108, 2012, article 264506). These dynamics mainly occur within $50~\mathrm{\mu} \mathrm{s} $ after the first contact, requiring imaging at 1 million f.p.s. For a water drop impacting on a thin layer of water, the entrapment of isolated bubbles starts through azimuthal instability, which forms at low impact velocities, in the neck connecting the drop and pool. For Reynolds number $Re$ above ${\sim }12\hspace{0.167em} 000$, up to 10 partial bubble rings have been observed at the base of the ejecta, starting when the contact is ${\sim }20\hspace{0.167em} \% $ of the drop size. More regular bubble rings are observed for a pool of ethanol or methanol. The video imaging shows rotation around some of these air cylinders, which can temporarily delay their breakup into micro-bubbles. The different refractive index in the pool liquid reveals the destabilization of the vortices and the formation of streamwise vortices and intricate vortex tangles. Fine-scale axisymmetry is thereby destroyed. We show also that the shape of the drop has a strong influence on these dynamics.
Splash wave and crown breakup after disc impact on a liquid surface
Authors: Peters Ivo R. , van der Meer Devaraj , Gordillo J. M. 
Published: April 2013

AbstractIn this paper we analyse the impact of a circular disc on a free surface using experiments, potential flow numerical simulations and theory. We focus our attention both on the study of the generation and possible breakup of the splash wave created after the impact and on the calculation of the force on the disc. We have experimentally found that drops are only ejected from the rim located at the top part of the splash – giving rise to what is known as the crown splash – if the impact Weber number exceeds a threshold value ${\mathit{We}}_{crit} \simeq 140$. We explain this threshold by defining a local Bond number $B{o}_{\mathit{tip}} $ based on the rim deceleration and its radius of curvature, with which we show using both numerical simulations and experiments that a crown splash only occurs when $B{o}_{\mathit{tip}} \gtrsim 1$, revealing that the rim disrupts due to a Rayleigh–Taylor instability. Neglecting the effect of air, we show that the flow in the region close to the disc edge possesses a Weber-number-dependent self-similar structure for every Weber number. From this we demonstrate that ${\mathit{Bo}}_{\mathit{tip}} \propto \mathit{We}$, explaining both why the transition to crown splash can be characterized in terms of the impact Weber number and why this transition occurs for $W{e}_{crit} \simeq 140$. Next, including the effect of air, we have developed a theory which predicts the time-varying thickness of the very thin air cushion that is entrapped between the impacting solid and the liquid. Our analysis reveals that gas critically affects the velocity of propagation of the splash wave as well as the time-varying force on the disc, ${F}_{D} $. The existence of the air layer also limits the range of times in which the self-similar solution is valid and, accordingly, the maximum deceleration experienced by the liquid rim, that sets the length scale of the splash drops ejected when $We\gt {\mathit{We}}_{crit} $.
Temperature dynamics in decaying isotropic turbulence with Joule heat production
Authors: De Marinis Dario , Chibbaro Sergio , Meldi Marcello , Sagaut Pierre 
Published: April 2013

AbstractThis paper presents an extension of existing works dealing with the dynamics of a passive scalar in freely decaying isotropic turbulence, by accounting for a production mechanism of the passive scalar itself. The physically relevant case of the temperature dynamics in the presence of Joule heating via the dissipation of the turbulent kinetic energy is selected and analysed by theoretical and numerical means. In particular, the sensitivity of the temperature decay to the non-dimensional parameters Prandtl number ($\mathit{Pr}$) and Eckert number ($\mathit{Ec}$), the latter measuring the intensity of the internal energy production mechanism, is investigated. The time behaviour of the global quantities such as the temperature variance $ \overline{{\theta }^{2} } (t)$ and its destruction rate ${\varepsilon }_{\theta } (t)$ is analysed, and a detailed analysis of the temperature variance spectrum ${E}_{\theta } (k)$ is provided. In the case of a very strong heating mechanism, some important modifications of the temperature dynamics are observed. The time-decay-law exponents of the global physical quantities assume new values, which are governed only by features of the kinetic energy spectrum, while they depend on the shape of ${E}_{\theta } (k)$ in the classical free-decay case. The temperature variance spectrum ${E}_{\theta } (k)$ exhibits two new spectral ranges. One is a convective–production range such that ${E}_{\theta } (k)\propto {k}^{1/ 3} $ is observed for a finite time at all values of $\mathit{Pr}$. In the case of very diffusive fluids with $\mathit{Pr}\ll 1$, a convective–diffusive–production range with ${E}_{\theta } (k)\propto {k}^{- 7/ 3} $ is also detected.
Resonance of the thermal boundary layer adjacent to an isothermally heated vertical surface
Authors: Zhao Yongling , Lei Chengwang , Patterson John C. 
Published: April 2013

AbstractThe instability characteristics and resonance of a natural convection boundary layer adjacent to an isothermally heated vertical surface are investigated using direct stability analyses. The detailed streamwise evolution of the boundary-layer frequencies is visualized via the power spectra of the temperature time series in the thermal boundary layer. It is found that the entire thermal boundary layer may be divided into three distinct regions according to the frequency profile, which include an upstream low-frequency region, a transitional region (with both low- and high-frequency bands) and a downstream high-frequency region. The high-frequency band in the downstream region determines the resonance characteristics of the thermal boundary layer, which can be triggered by a single-mode perturbation at frequencies within the high-frequency band. The single-mode perturbation experiments further reveal that the maximum resonance of the thermal boundary layer is triggered by a perturbation at the characteristic frequency of the boundary layer. For the boundary-layer flow at $\mathit{Ra}= 3. 6\times 1{0}^{10} $ and $\mathit{Pr}= 7$, a net heat transfer enhancement of up to 44 % is achieved by triggering resonance of the boundary layer. This significant enhancement of heat transfer is due to the resonance-induced advancement of the laminar–turbulent transition, which is found to be dependent on the perturbation frequency and amplitude. Evidence from different perspectives revealing the same position of the transition are provided and discussed. The outcomes of this investigation demonstrate the prospect of a resonance-based approach for enhancing heat transfer.
Heat transfer across sheared suspensions: role of the shear-induced diffusion
Authors: Metzger Bloen , Rahli Ouamar , Yin Xiaolong 
Published: April 2013

AbstractSuspensions of non-Brownian spherical particles undergoing shear provide a unique system where mixing occurs spontaneously at low Reynolds numbers. Through a combination of experiments and simulations, we investigate the effect of shear-induced particle diffusion on the transfer of heat across suspensions. The influence of particle size, particle volume fraction and applied shear are examined. By applying a heat pulse to the inner copper wall of a Couette cell and analysing its transient temperature decay, the effective thermal diffusivity of the suspension, $\alpha $, is obtained. Using index matching and laser-induced fluorescence imaging, we measured individual particle trajectories and calculated their diffusion coefficients. Simulations that combined a lattice Boltzmann technique to solve for the flow and a passive Brownian tracer algorithm to solve for the transfer of heat are in very good agreement with experiments. Fluctuations induced by the presence of particles within the fluid cause a significant enhancement (${\gt }200\hspace{0.167em} \% $) of the suspension transport properties. The effective thermal diffusivity was found to be linear with respect to both the Péclet number ($\mathit{Pe}= \dot {\gamma } {d}^{2} / {\alpha }_{0} \leq 100$) and the solid volume fraction ($\phi \leq 40\hspace{0.167em} \% $), leading to a simple correlation $\alpha / {\alpha }_{0} = 1+ \beta \phi \mathit{Pe}$ where $\beta = 0. 046$ and ${\alpha }_{0} $ is the thermal diffusivity of the suspension at rest. In our Couette cell, the enhancement was found to be optimum for a volume fraction, $\phi \approx 40\hspace{0.167em} \% $, above which, due to steric effects, both the particle diffusion motion and of the effective thermal diffusion dramatically decrease. No such correlation was found between the average particle rotation and the thermal diffusivity of the suspension, suggesting that the driving mechanism for enhanced transport is the translational particle diffusivity. Movies are available with the online version of the paper.
Influence of environment and climate on occurrence of the cixiid planthopperHyalesthes obsoletus, the vector of the grapevine disease ‘bois noir’
Authors: Panassiti Bernd , Breuer Michael , Marquardt Stacey , Biedermann Robert 
Published: April 2013

AbstractSpecies distribution models (SDMs), which are well established in many fields of biological research, are still uncommon in the agricultural risk analysis of pest insects. To exemplify the use of SDMs, we investigated the influence of environmental factors on the occurrence ofHyalesthes obsoletusSignoret (Hemiptera: Cixiidae). The planthopper is the only known vector of the grapevine yellows disease ‘bois noir’. The study was conducted in 145 locations in the Baden region of southwest Germany. The planthopper was surveyed on host plant patches, consisting of stinging nettle and/or bindweeds. We used a stratified modelling framework where (1) species presence–absence data were related to an extensive environmental dataset using logistic regressions; and (2) different types of average models were developed based on an information theoretic method. The results show that the incidence ofH. obsoletusis associated to above- as well as below-ground environmental factors, particularly to the amount of fine soil and average annual precipitation. This result was consistent across all average models. The relative importance of other environmental variables was dependent upon the average model under consideration and thus may vary according to their intended use, either the explanation of habitat requirements or the prediction and mapping of occurrence risks. The study showed that SDMs offer a quantification of species’ habitat requirements and thus, could represent a valuable tool for pest management purposes. By providing examples of current issues of grapevine pests in viticulture, we discuss the use of SDMs in agricultural risk analysis and highlight their advantages and caveats.
The cetaceans of Aruba, southern Caribbean
Authors: Luksenburg Jolanda A. 
Published: April 2013

Aruba is one of the most densely populated islands in the Caribbean. However, very little is known about its cetaceans. In 2010 and 2011, a total of 19721 km (1686 h) boat-based surveys over nearshore transects resulted in 117 positively-identified sightings comprising eight species. New records are also added for one of three previously-documented species. Five additional species were documented from strandings or reports by others. This brings the total number of cetacean species identified in Aruban waters to 16, of which nine are authenticated here for the first time. Atlantic spotted dolphin (Stenella frontalis(N = 59) and bottlenose dolphin (Tursiops truncatus) (N = 33) were the most frequently observed species, with sightings of both year-round, followed by spinner dolphin (S. longirostris) and false killer whale (Pseudorca crassidens). Additional species recorded are pantropical spotted dolphin (S. attenuata), striped dolphin (S. coeruleoalba), common dolphin (Delphinus capensis), rough-toothed dolphin (Steno bredanensis), short-finned pilot whale (Globicephala macrorhynchus), killer whale (Orcinus orca), Risso's dolphin (Grampus griseus), humpback whale (Megaptera novaeangliae), Bryde's/Eden's whale (Balaenoptera brydei/edeni), sperm whale (Physeter macrocephalus) and an unidentified beaked whale (Mesoplodonsp.). All cetaceans were sighted within 22 km of the coast in relatively shallow waters. Sighting rate was low (0.69 cetacean sightings per 100 km). Sightings of calves and neonates indicate that Aruba may be a nursing or breeding area for some species. The presence of several species of cetaceans in Aruba's coastal waters year-round indicates that status and threat assessments are needed to protect them.
Animacy hierarchy effects on the second language acquisition of attributive psych adjectives
Authors: ZHANG JINGYU 
Published: April 2013

ABSTRACTThis article argues that “animacy” in the context of attributive psych adjectives can be subcategorized into “human,” “human by metonymy,” and “animate” and that these subcategories play a role for Chinese speakers acquiring English. A study that involved an acceptability judgment test found that, in contrast to a group of native controls, the second language (L2) speakers misuse adjectival –ed for adjectival –ing with animate nouns and adjectival –ing for adjectival –ed with human by metonymy nouns, indicating that L2 speakers appeal to an “animacy hierarchy” in determining the meanings of English psych adjectives. There is no evidence in the target language input for such a hierarchy, so the results are consistent with the view that these L2 learners are drawing on universal properties of thematic organization.
A Grave Situation: An Examination of the Legal Issues Raised by the Life and Death of Charles Byrne, the “Irish Giant”
Authors: Muinzer Thomas L. 
Published: April 2013

AbstractCharles Byrne was an eighteenth-century celebrity “Irish giant” who requested burial upon nearing death, but whose corpse was procured against his wishes by the surgeon John Hunter. Hunter reduced Byrne's corpse to its skeleton and exhibited it as the centerpiece of his vast anatomical collection. It has since remained on display in the Hunterian Museum, London. In 2011 it was announced that research conducted on the skeleton's DNA has revealed that several Northern Irish families share a common ancestry with Byrne. This article considers the legal issues raised by Byrne's story. The results of fieldwork undertaken by the author in Byrne's native townland are also discussed, where folk tradition suggests that Byrne wished to be buried foremost at a local site remembered today as “the Giant's Grave.”
Modern Antiquities: The Looted and the Faked
Authors: Scott David A. 
Published: April 2013

AbstractThis article discusses some of the issues regarding the acquisition of art and the different philosophical views of some of the main protagonists regarding the reclaiming of art by nation-states, following American museums' acceptance of the 1970 UNESCO Convention, using examples from the Getty Museum and the Metropolitan Museum of Art. The mediation of Native American Graves Protection and Repatriation Act (NAGPRA) claims by conservators is often an important component of the dialogue between museums and native communities. The philosophical and art-historical opinions regarding the value of copies and reproductions of works of art have oscillated from promulgation in the 1860s to outright rejection by the 1920s. In a modernist sense, points of view are once again open to reevaluation as host nations demand back more originals than ever before. Arguments against the claims of nationalist-retentionist countries and those advanced in favor of the claims of nation-states regarding the repatriation of their art are discussed. The problems created by looted art in association with the ever-increasing number of fakes is highlighted, with examples of the issues surrounding pre-Columbian art and some classical antiquities. The utility of copies in relation to the protective value of the authentic piece is discussed in the context of museum examples in which the concept of the utilization of copies for museum display has been accepted in certain cases as desirable.
Digitizing Pacific Cultural Collections: The Australian Experience
Authors: Singh Supriya , Blake Meredith , O'Donnell Jonathan 
Published: April 2013

AbstractIn the absence of specific policies that address the digitization of Pacific cultural collections, it is important to document the practices of Australian museum professionals and cultural experts who deal with close to one-fifth of Pacific cultural objects held in museums. Interviews with 17 museum professionals and cultural experts in Australia help advance reflective practice relating to digitizing Pacific collections. Drawing on principles enshrined in international, regional, and Australian policies and protocols relating to the management of indigenous collections, they favor responsible digitization based on consultation with source and diasporic communities. In order to consult across a region with multiple languages and cultures when time and resources are limited, they begin with areas they know best and when possible, work with curators of Pacific backgrounds. Some practicalities of publishing and protecting digitized images online revolve around validating information about the artifact and going beyond copyright to respect traditional knowledge.
Analysis of Chemical Changes and Microstructure Characterization during Deformation in Ferritic Stainless Steel
Authors: Núñez Andrés , Llovet Xavier , Almagro Juan F. 
Published: April 2013

AbstractUni- and biaxial tension deformation tests, with different degrees of deformation, have been done on AISI 430 (EN 1.4016) ferritic stainless steel samples, which had both different chemical compositions and had undergone different annealing treatments. The initial and deformed materials were characterized by using electron backscatter diffraction and backscatter electron imaging in a scanning electron microscope together with electron probe microanalysis. The correlation observed among the chemical compositions, annealing treatment, and strain level obtained after deformation is discussed.
Teaching Partners to Support Communication for Adults with Acquired Communication Impairment
Authors: Ball Laura J. , Lasker Joanne 
Published: April 2013

Abstract
For adults with acquired communication impairment, particularly those who have communication disorders associated with stroke or neurodegenerative disease, communication partners play an important role in establishing and maintaining communicative competence. In this paper, we assemble some evidence on this topic and integrate it with current preferred practice patterns (American Speech-Language-Hearing Association, 2004). Our goals are to help speech-language pathologists (SLPs) identify and describe partner-based communication strategies for adults with acquired impairment, implement evidence-based approaches for teaching strategies to communication partners, and employ a Personnel Framework (Binger et al., 2012) to clarify partners? roles in acquiring and supporting communication tools for individuals with acquired impairments. We offer specific guidance about AAC techniques and message selection for communication partners involved with chronic, degenerative, and end of life communication. We discuss research and provide examples of communication partner supports for person(s) with aphasia and person(s) with amyotrophic lateral sclerosis who have complex communication needs.
Fundamentals of the ImPAACT Program
Authors: Kent-Walsh Jennifer , Binger Cathy 
Published: April 2013

Abstract
Researchers widely agree that working with communication partners is a critical component of any AAC intervention program. However, it can be difficult for clinicians to know how to structure this type of indirect intervention to do more than “tell” communication partners of individuals using AAC what they “should” be doing. The ImPAACT Program is one intervention program that has been documented to yield positive results for clients using AAC. The program involves a structured multistep approach to intervention that clinicians can customize for use across a range of communication partners, clients, and instructional contexts. In this article, we provide an overview of the program's instructional content, approach, and basis of evidence.
The ethics of disaster management
Authors: Kathleen Geale Sara 
Published: April 2013

PurposeEthics is the foundation on which societies and cultures are based and are fundamental to political, social and economic decision making. Ethical dilemmas have created controversy and heated debate over the years. Disasters have been defined in public health terms as destructive events that result in the need for a wide range of emergency resources to assist and ensure the survival of the stricken population. Lack of medical resources, in conjunction with a mass casualty situation, can present specific ethical challenges. The purpose of this paper is to explore the ethics of disaster management.Design/methodology/approachIn and after a disaster, ethical questions arise regarding appropriate and fair allocation of relief funds to help with recovery. Research in disaster settings poses unique ethical dilemmas. The researcher must determine how to balance the critical need for research with the ethical obligation of respect for, and protection of, the interests of research participants. Ethics as part of an educational program made available to health care providers may assist disaster responders to make the difficult ethical decisions involved in disasters. This literature review discusses these issues in conjunction with disaster response and recovery.FindingsThe cardinal virtues of disaster response are prudence, courage, justice, stewardship, vigilance, resilience, self‐effacing charity and communication. These eight virtues are not considered all inclusive, no more than Aristotle considered that his morals or virtues were all inclusive. Ongoing work in disaster management will help to ensure that such situations are managed in an ethical manner that respects the rights and privileges of all those involved.Research limitations/implicationsThe literature reviewed for this paper was based on peer reviewed scholarly writings. Concepts of ethics and justice are important issues in disaster situations. This paper offers ideas to prompt further discussion among disaster managers and students of disaster studies.Practical implicationsSocial changes are reliant on an understanding of ethics and how it affects society. This paper puts forward ethical concepts to prompt discussion by disaster responders and managers with the hope of improving disaster management.Originality/valueThe paper is an original document that may be useful to students of disaster management and those who teach disaster management