bluuebunny/crossref_metadata_2025_split huggingface dataset:
A new approach to account for fracture aperture variability when modeling solute transport in fracture networks
Authors: Larsson Martin , Odén Magnus , Niemi Auli , Neretnieks Ivars , Tsang Chin‐Fu 
Published: February 2013

Key Points
Simple method includes effect of aperture variability in fracture network models
Fracture variability lessens matrix diffusion & retardation of solute transport
Quadratic relationship for flow‐wetted surface and median solute arrival time
Tuberculosis: Experience in a Low Endemic Area Australian Tertiary Hospital
Authors: Gill Preetjote , Coatsworth Nicholas R. , Gundara Justin S. , Hugh Thomas J. , Samra Jaswinder S. 
Published: February 2013

AbstractBackgroundAbdominal tuberculosis (ATB) poses a significant diagnostic, management, and resource challenge. In Australia, an increasing number of tuberculosis (TB) cases are being reported, and we describe our experience of ATB in an Australian tertiary institution.MethodsAll diagnosed cases of tuberculosis (TB) at the Royal North Shore tertiary hospital campus of the University of Sydney are entered prospectively into a central registry. Cases of ATB encountered between September 1991 and November 2011 were identified and retrospectively reviewed.ResultsIn all, 841 cases of TB were identified, of which 20 were abdominal (2.4 %). Median age at presentation was 34 years (range: 22–79 years), and 55 % of patients were women. None of the patients were born in Australia and 11 patients were of South Asian origin. The most common presenting symptom was abdominal pain (65 %). Diagnosis was based primarily on histology (90 % sensitivity), and the sensitivity of PCR analysis in this series was low (44 %). Eleven of the patients required laparoscopy or laparotomy. 40 % of cases involved the peritoneum, and disease was also seen in solid organs (liver, spleen, pancreas, adrenal gland) and bowel (esophagus, small bowel, colon).ConclusionsIn our local experience ATB was seen exclusively in the immigrant population. The presentation of ATB varies greatly, necessitating a high index of suspicion within the context of abdominal symptoms in high‐risk groups. The role of surgical involvement is indispensable for both diagnosis and management of ATB‐related complications. Surgeons should remain mindful of the diagnosis in an age of increasing worldwide incidence.
Age and gender differences in coping style across various problems: Omani adolescents' perspective
Authors: Al‐Bahrani Muna , Aldhafri Said , Alkharusi Hussain , Kazem Ali , Alzubiadi Abdulqawi 
Published: February 2013

ABSTRACTThis study examines adolescents' coping styles, with relation to their gender and age and level, of six types of problems. The participants were 1843 adolescents (51.7% female and 48.3% male) from the Sultanate of Oman with a mean age of 15.75. Two scales examining general adaptive and maladaptive coping styles and levels of school, economic, personal, health, family, and emotional problems were administered. The findings showed that adolescents' high levels of perceived problems were associated with higher levels of maladaptive coping styles than those with low levels of problems. Furthermore, female adolescents seem to use maladaptive coping styles (across all levels of the six types of problems) more than males. The use of adaptive and maladaptive coping styles increase with age.
Are drumlins a product of a thermo-mechanical instability?
Authors: Hooke Roger LeB. , Medford Aaron 
Published: February 2013

AbstractOf numerous theories of drumlin genesis, none has been widely accepted. It seems evident, however, that some form of positive feedback process is involved. Under certain circumstances perturbations are amplified. Herein we suggest that patchy areas of frozen bed provide the initial perturbation. Such frozen patches may occur in local areas underlain by material of lower thermal conductivity or on slight topographic highs. Drag exerted by the frozen patch deflects ice flow into its lee, dragging with it mobile till eroded from the thawed area. The energy balance is such that this till likely refreezes, either producing a topographic perturbation or amplifying an existing one. The resulting topography then deflects more of the geothermal heat away from the developing hill and into the adjacent trough, resulting in a positive feedback. Once the thermal perturbation exceeds a critical (though as yet undefined) level, melting may decouple the ice from the bed, preventing further entrainment of till from thawed areas, and thus limiting the height and length of the drumlin.
Nonlinear mushy-layer convection with chimneys: stability and optimal solute fluxes
Authors: Wells Andrew J. , Wettlaufer J. S. , Orszag Steven A. 
Published: February 2013

AbstractWe model buoyancy-driven convection with chimneys – channels of zero solid fraction – in a mushy layer formed during directional solidification of a binary alloy in two dimensions. A large suite of numerical simulations is combined with scaling analysis in order to study the parametric dependence of the flow. Stability boundaries are calculated for states of finite-amplitude convection with chimneys, which for a narrow domain can be interpreted in terms of a modified Rayleigh number criterion based on the domain width and mushy-layer permeability. For solidification in a wide domain with multiple chimneys, it has previously been hypothesized that the chimney spacing will adjust to optimize the rate of removal of potential energy from the system. For a wide variety of initial liquid concentration conditions, we consider the detailed flow structure in this optimal state and derive scaling laws for how the flow evolves as the strength of convection increases. For moderate mushy-layer Rayleigh numbers these flow properties support a solute flux that increases linearly with Rayleigh number. This behaviour does not persist indefinitely, however, with porosity-dependent flow saturation resulting in sublinear growth of the solute flux for sufficiently large Rayleigh numbers. Finally, we consider the influence of the porosity dependence of permeability, with a cubic function and a Carman–Kozeny permeability yielding qualitatively similar system dynamics and flow profiles for the optimal states.
Natural logarithms
Authors: McKeon B. J. 
Published: February 2013

AbstractMarusic et al. (J. Fluid Mech., vol. 716, 2013, R3) show the first clear evidence of universal logarithmic scaling emerging naturally (and simultaneously) in the mean velocity and the intensity of the streamwise velocity fluctuations about that mean in canonical turbulent flows near walls. These observations represent a significant advance in understanding of the behaviour of wall turbulence at high Reynolds number, but perhaps the most exciting implication of the experimental results lies in the agreement with the predictions of such scaling from a model introduced by Townsend (J. Fluid Mech., vol. 11, 1961, pp. 97–120), commonly termed the attached eddy hypothesis. The elegantly simple, yet powerful, study by Marusic et al. should spark further investigation of the behaviour of all fluctuating velocity components at high Reynolds numbers and the outstanding predictions of the attached eddy hypothesis.
Using Samples of Unequal Length in Generalized Method of Moments Estimation
Authors: Lynch Anthony W. , Wachter Jessica A. 
Published: February 2013

AbstractThis paper describes estimation methods, based on the generalized method of moments (GMM), applicable in settings where time series have different starting or ending dates. We introduce two estimators that are more efficient asymptotically than standard GMM. We apply these to estimating predictive regressions in international data and show that the use of the full sample affects inference for assets with data available over the full period as well as for assets with data available for a subset of the period. Monte Carlo experiments demonstrate that reductions hold for small-sample standard errors as well as asymptotic ones.
Vernacular Publics and Political Modernity: Language and Progress in Colonial South India
Authors: MANTENA RAMA SUNDARI 
Published: February 2013

AbstractThe late-nineteenth century in India, usually scrutinized for the emergence of anti-colonial nationalist thought and politics, witnessed broader, and potentially more radical changes in the making and re-making of political subjectivities as articulated within burgeoning vernacular public spheres. Vernacular publics coalesced around the emergence of new communicative forms, the formation of voluntary and political associations, and the restructuring of literary communities. It is within this context I place the writings of Gidugu Venkata Ramamurti (1863–1940). He proclaimed at the turn of the twentieth century that Telugu as a language had to be reformed in order for it to become an appropriate medium for the newly emergent Telugu public spheres. Through his study of linguistics, his commitment to educational reform, and his study of Telugu language and literature, Ramamurti became the spokesperson for a new Telugu that would be able to traverse the boundaries of modern genres of writing that flourished in the colonial era. Fully immersed in linguistic theories of the day, Ramamurti's concerns were primarily with language reform and its centrality in the remaking of political subjectivities.‘In this era there is an important challenge facing us. There is no Telugu word for ‘challenge,’ nevertheless, the word, ‘dhikaaramu’ or defiance, comes close. For that reason, I am calling this era, ‘dhikaara yugamu,’ the age of defiance. In the past, society was divided between free people and the enslaved. Soon, the enslaved defied the power of the free and freed themselves. In the past, women were not allowed to be educated nor were they allowed to work. Now they are asking themselves why they were not considered more productive in society? These days, women are performing all kinds of work. . . .Until recently, in most countries the wealthy held power. And now the poor are challenging the power of the rich’.1
Between dominance and decline: status anxiety and great power rivalry
Authors: ONEA TUDOR A. 
Published: February 2013

AbstractThis article investigates the role of status considerations in the response of dominant powers to the rise of emergent states. Accordingly, the hypothesis explored is that dominant actors are prone to fear that they will lose their upper rank, and, due to this status anxiety, resist the efforts of emergent powers to match or surpass them. The article begins by explaining why political actors deem status important and puts forward a theory of status anxiety in world politics. The more pronounced is this anxiety across status dimensions (economic and military capabilities as well as prestige), the higher the likelihood of conflict. This argument is then tested against competing theories of dominant power behaviour in two cases: the relations between France and Britain from the 1740s to Napoleon and those between Britain and Germany from the 1880s to World War One.
Securitisation and Diego Garcia
Authors: SALTER MARK B. , MUTLU CAN E. 
Published: February 2013

AbstractTo advance the on-going debate on Securitisation Theory (ST), we argue that the important questions of audience and attention can be addressed through careful historical study. In an analysis of the securitising moves concerning the American military base on Diego Garcia, we are able to demonstrate that the Copenhagen and Paris Schools are not methodologically incompatible, and empirically that public attention for security issues has a tendency to dissipate without continual discursive investment.
Bio-inspired backlash reduction of a low-cost robotic joint using closed-loop-commutated stepper motors
Authors: Veres József , Cserey György , Szederkényi Gábor 
Published: February 2013

SUMMARYThe majority of current robotic joints are primarily actuated by rotational mechanisms. These electrical drives have substantially different features than the features found in human muscular systems. This paper presents a cost-effective solution to the backlash of a phenomenon known to cause positioning errors and other undesirable dynamic effects in drives. These errors are particularly pronounced when relatively major changes appear in the pre-load conditions of the motor such as in the case of a robotic leg or arm with a high degree of freedom. Current solutions require an accurate time-varying model of drives that is not available in the majority of practical cases. Therefore, in this paper a digitally controlled mechanical solution is proposed which is inspired by the human flexor–extensor mechanism. The idea is to construct an antagonistic actuator pair analogous to the flexor and extensor muscles. In order to obtain good control performance even in the low-speed range, permanent magnet stepper motors were chosen as actuators that are commutated in a digitally closed-loop fashion. The operation of the controlled structure has been verified in a real experimental environment where measurements showed good results and match with previous simulations.
Single-stage surgical repair of a complex pathology in Williams syndrome
Authors: Feng Tong , Zhi-Qiang Li , Ying-Long Liu 
Published: February 2013

AbstractWilliams syndrome is caused by a gene deletion of chromosome 7. A majority of the cases are sporadic with typical facial appearance, cardiac anomalies, and mental retardation. We report a rare case of Williams syndrome associated with supravalvular aortic stenosis, subvalvular aortic membrane, mitral regurgitation, aortic coarctation, and patent ductus arteriosus. The patient had undergone a single-stage surgical repair with satisfactory results at 5 months of follow-up.
Catheter interventions in the staged management of hypoplastic left heart syndrome
Authors: Reinhardt Zdenka , De Giovanni Joseph , Stickley John , Bhole Vinay K. , Anderson Benjamin , Murtuza Bari , Mehta Chetan , Miller Paul , Dhillon Rami , Stumper Oliver 
Published: February 2013

AbstractAimTo analyse the current practice and contribution of catheter interventions in the staged management of patients with hypoplastic left heart syndrome.MethodsThis study is a retrospective case note review of 527 patients undergoing staged Norwood/Fontan palliation at a single centre between 1993 and 2010. Indications and type of catheter interventions were reviewed over a median follow-up period of 7.5 years.ResultsA staged Norwood/Fontan palliation for hypoplastic left heart syndrome was performed in 527 patients. The 30-day survival rate after individual stages was 76.5% at Stage I, 96.3% at Stage II, and 99.4% at Stage III. A total of 348 interventions were performed in 189 out of 527 patients. Freedom from catheter intervention in survivors was 58.2% before Stage II and 46.7% before Stage III. Kaplan–Meier freedom from intervention post Fontan completion was 55% at 10.8 years of follow-up. Post-stage I interventions were mostly directed to relieve aortic arch obstruction – 84 balloon angioplasties – and augment pulmonary blood flow – 15 right ventricle-to-pulmonary conduit interventions; post-Stage II interventions centred on augmenting size of the left pulmonary artery – 73 procedures and abolishing systemic venous collaterals – 32 procedures. After Stage III, the focus was on manipulating the size of the fenestration – 42 interventions – and the left pulmonary artery −31 procedures.ConclusionInterventional cardiac catheterisation constitutes an integral part in the staged palliative management of patients with hypoplastic left heart syndrome. Over one-third (37%) of patients undergoing staged palliation required catheter intervention over the follow-up period.
AN ANALYTICAL AND NUMERICAL STUDY OF UNSTEADY CHANNEL FLOW WITH SLIP
Authors: MATTHEWS MICCAL T. , HASTIE KAREN M. 
Published: February 2013

AbstractA theoretical investigation of the unsteady flow of a Newtonian fluid through a channel is presented using an alternative boundary condition to the standard no-slip condition, namely the Navier boundary condition, independently proposed over a hundred years ago by both Navier and Maxwell. This boundary condition contains an extra parameter called the slip length, and the most general case of a constant but different slip length on each channel wall is studied. An analytical solution for the velocity distribution through the channel is obtained via a Fourier series, and is used as a benchmark for numerical simulations performed utilizing a finite element analysis modified with a penalty method to implement the slip boundary condition. Comparison between the analytical and numerical solution shows excellent agreement for all combinations of slip lengths considered.
Report of a feasibility study of a Mindfulness group for clients, carers and staff of an early intervention in psychosis service
Authors: Moorhead S. 
Published: February 2013

AbstractMindfulness meditation is developing momentum as a mental health promoting activity in clinical and non-clinical settings. Our Early Intervention in Psychosis (EIP) service wished to determine its acceptability and utility among a mixed group of participants. All clinical team members, their patients and their carers were offered an 8-week Mindfulness group. Participants rated acceptability before and after. They prospectively identified, then monitored, distress associated with areas of their lives they hoped might improve. Nineteen participants provided a mean attendance of 11.25 per group. The group was overwhelmingly positively perceived and distress associated with participants’ items significantly improved. Findings support further implementation. The goal of inclusion was achieved with some reservation about staff preparation.
Incretin-stimulated interaction between β-cell Kv1.5 and Kvβ2 channel proteins involves acetylation/deacetylation by CBP/SirT1
Authors: Kim Su-Jin , Ao Ziliang , Warnock Garth , McIntosh Christopher H. S. 
Published: February 2013

The incretins, GIP (glucose-dependent insulinotropic polypeptide) and GLP-1 (glucagon-like peptide-1) are gastrointestinal hormones conferring a number of beneficial effects on β-cell secretion, survival and proliferation. In a previous study, it was demonstrated that delayed rectifier channel protein Kv2.1 contributes to β-cell apoptosis and that the prosurvival effects of incretins involve Kv2.1 PTMs (post-translational modifications), including phosphorylation and acetylation. Since Kv1.5 overexpression was also shown to stimulate β-cell death, the present study was initiated in order to determine whether incretins modulate Kv1.5α–Kvβ2 interaction via PTM and the mechanisms involved. GIP and GLP-1 reduced apoptosis in INS-1 β-cells (clone 832/13) overexpressing Kv1.5, and RNAi (RNA interference)-mediated knockdown of endogenous Kv1.5 attenuated apoptotic β-cell death. Both GIP and GLP-1 increased phosphorylation and acetylation of Kv1.5 and its Kvβ2 protein subunit, leading to their enhanced interaction. Further studies demonstrated that CBP [CREB (cAMP-response-element-binding protein)-binding protein]/SirT1 mediated acetylation/deacetylation and interaction between Kvβ2 and Kv1.5 in response to GIP or GLP-1. Incretin regulation of β-cell function therefore involves the acetylation of multiple Kvα and Kvβ subunits.
Recurrent pain and discomfort in relation to fitness and physical activity among young school children
Authors: Sollerhed Ann‐Christin , Andersson Ingemar , Ejlertsson Göran 
Published: February 2013

AbstractAs an increase in pain symptoms among children has been shown in the last decades, the aim of this study was to describe perceptions of recurrent pain, measured physical fitness and levels of reported physical activity (PA) in children, and to investigate if any associations between PA, fitness and recurrent pain could be identified. A school‐based study comprised 206 Swedish children 8–12 years old, 114 boys, 92 girls. A questionnaire with questions about perceived pain, self‐reported PA and lifestyle factors was used. Health‐related fitness was assessed by 11 physical tests. A physical index was calculated from these tests as a z score. High physical index indicated high fitness and low physical index indicated low fitness. ANOVA test, chi‐square test and logistic regression analysis were used to compare active and inactive children. The prevalence of one pain location (head, abdomen or back) was 26%, two 11% and three 4% (n=206). Female gender, living in single‐parent families, low PA and low subjective health were associated with reported recurrent pain. Children reporting high levels of PA had high physical index and reported low prevalence of pain symptoms. The physical index and level of self‐reported PA decreased gradually the more pain locations. Physically active children had higher fitness levels and reported less pain symptoms than inactive peers. Coping with pain is an integral part of PA, and active children learn to cope with unpleasant body sensations which together with high fitness may reduce the perception of pain.
Respiratory Virus Shedding in a Cohort of On-Duty Healthcare Workers Undergoing Prospective Surveillance
Authors: Esbenshade Jennifer C. , Edwards Kathryn M. , Esbenshade Adam J. , Rodriguez Vanessa E. , Talbot H. Keipp , Joseph Marlon F. , Nwosu Samuel K. , Chappell James D. , Gern James E. , Williams John V. , Talbot Thomas R. 
Published: February 2013

Background.Healthcare-associated transmission of respiratory viruses is a concerning patient safety issue.Design.Surveillance for influenza virus among a cohort of healthcare workers (HCWs) was conducted in a tertiary care children's hospital from November 2009 through April 2010 using biweekly nasal swab specimen collection. If a subject reported respiratory symptoms, an additional specimen was collected. Specimens from ill HCWs and a randomly selected sample from asymptomatic subjects were tested for additional respiratory viruses by multiplex polymerase chain reaction (PCR).Results.A total of 1,404 nasal swab specimens were collected from 170 enrolled subjects. Influenza circulated at very low levels during the surveillance period, and 74.2% of subjects received influenza vaccination. Influenza virus was not detected in any specimen. Multiplex respiratory virus PCR analysis of all 119 specimens from symptomatic subjects and 200 specimens from asymptomatic subjects yielded a total of 42 positive specimens, including 7 (16.7%) in asymptomatic subjects. Viral shedding was associated with report of any symptom (odds ratio [OR], 13.06 [95% confidence interval, 5.45–31.28]; P< .0001) and younger age (OR, 0.96 [95% confidence interval, 0.92–0.99]; P = .023) when controlled for sex and occupation of physician or nurse. After the surveillance period, 46% of subjects reported working while ill with an influenza-like illness during the previous influenza season.Conclusions.In this cohort, HCWs working while ill was common, as was viral shedding among those with symptoms. Asymptomatic viral shedding was infrequent but did occur. HCWs should refrain from patient care duties while ill, and staffing contingencies should accommodate them.