bluuebunny/crossref_metadata_2025_split huggingface dataset:
Manning’s formula and Strickler’s scaling explained by a co-spectral budget model
Authors: Bonetti S. , Manoli G. , Manes C. , Porporato A. , Katul G. G. 
Published: January 2017

Manning’s empirical formula in conjunction with Strickler’s scaling is widely used to predict the bulk velocity$V$from the hydraulic radius$R_{h}$, the roughness size$r$and the slope of the energy grade line$S$in uniform channel and pipe flows at high bulk Reynolds numbers. Despite their importance in science and engineering, both Manning’s and Strickler’s formulations have waited for decades before finding a theoretical explanation. This was provided, for the first time, by Gioia & Bombardelli (Phys. Rev. Lett., vol. 88, 2002, 014501), labelled as GB02, using phenomenological arguments. Perhaps their most remarkable finding was the link between the Strickler and the Kolmogorov scaling exponents, the latter pertaining to velocity fluctuations in the inertial subrange of the turbulence spectrum and presumed to be universal. In this work, the GB02 analysis is first revisited, showing that GB02 employed severalad hocscaling assumptions for the turbulent kinetic energy dissipation rate and, although implicitly, for the mean velocity gradient adjacent to the roughness elements. The similarity constants arising from the GB02 scaling assumptions were presumed to be independent of$r/R_{h}$, which is inconsistent with well-known flow properties in the near-wall region of turbulent wall flows. Because of the dependence of these similarity constants on$r/R_{h}$, this existing theory requires the validity of the Strickler scaling to cancel the dependence of these constants on$r/R_{h}$so as to arrive at the Strickler scaling and Manning’s formula. Here, the GB02 approach is corroborated using a co-spectral budget (CSB) model for the wall shear stress formulated at the cross-over between the roughness sublayer and the log region. Assuming a simplified shape for the spectrum of the vertical velocity$w$, the proposed CSB model (subject to another simplifying assumption that production is balanced by pressure–velocity interaction) allows Manning’s formula to be derived. To substantiate this approach, numerical solutions to the CSB over the entire flow depth using different spectral shapes for$w$are carried out for a wide range of$r/R_{h}$. The results from this analysis support the simplifying hypotheses used to derive Manning’s equation. The derived equation provides a formulation for$n$that agrees with reported values in the literature over seven decades of$r$variations. While none of the investigated spectral shapes allows the recovery of the Strickler scaling, the numerical solutions of the CSB reproduce the Nikuradse data in the fully rough regime, thereby confirming that the Strickler scaling represents only an approximate fit for the friction factor for granular roughness.
Risk-based perspective on the choice of alliance governance in high-tech industries
Authors: Kim Hwan-Jin , Kim Byung-Keun 
Published: January 2017

AbstractThis paper examines the influence of risks on alliance governance modes in high-tech industries. The extant literature has devoted little attention to the preferred governance mode based on the risks surrounding alliances. In this paper, we examine why risks are key factors in the alliance governance decision and investigate the choice of alliance governance mode in high-tech industries. Hypotheses are formulated based on risk perspectives; these hypotheses are empirically tested using data on 3,228 alliance records generated over the past 5 years in high-tech industries. The results suggest that risk perspectives provide an effective rationale for choosing an alliance governance mode in a high-tech industry. In the conclusion, we discuss critical issues in the current debates on predicting alliance governance modes.
Women in management: Are family firms somehow special?
Authors: Meroño-Cerdán Ángel L , López-Nicolás Carolina 
Published: January 2017

AbstractFirms managed by women present some differences in organizational conditions in terms of type of business and manager profile. The aim of this study is to check if those differences persist in family firms where the presence of female managers is higher, especially in second or subsequent generation family firms, than in non-family firms. The results reveal that family firms run by women are not smaller, but are concentrated in the services sector like non-family firms. Regarding the manager profile there are no differences either in the level of training or the age of female managers. They possess, however, less management experience but only in first generation family firms. In sum, gender differences in the type of business and in the manager profile found in the management literature disappear in family firms, only a sectoral gender effect persists.
A local perspective on community structure in multilayer networks
Authors: JEUB LUCAS G. S. , MAHONEY MICHAEL W. , MUCHA PETER J. , PORTER MASON A. 
Published: January 2017

AbstractThe analysis of multilayer networks is among the most active areas of network science, and there are several methods to detect dense “communities” of nodes in multilayer networks. One way to define a community is as a set of nodes that trap a diffusion-like dynamical process (usually a random walk) for a long time. In this view, communities are sets of nodes that create bottlenecks to the spreading of a dynamical process on a network. We analyze the local behavior of different random walks on multiplex networks (which are multilayer networks in which different layers correspond to different types of edges) and show that they have very different bottlenecks, which correspond to rather different notions of what it means for a set of nodes to be a good community. This has direct implications for the behavior of community-detection methods that are based on these random walks.
The battle over the benefits: analysing two sport hunting policy arrangements in Uganda
Authors: Ochieng Amos , Visseren-Hamakers Ingrid J. , van der Duim René 
Published: January 2017

AbstractIn 2001 sport hunting was reintroduced in Uganda around Lake Mburo National Park, and in 2008 at Kabwoya and Kaiso-Tonya Game Management Area, to derive economic benefits for communities and thus reduce human–wildlife conflict and change communities’ attitudes towards wildlife. We used the policy arrangement approach to analyse and compare the development of the two sport hunting policy arrangements. Through interviews and document review we learned that the arrangement at Lake Mburo changed considerably over time, whereas that at Kabwoya remained relatively stable. The two policy arrangements started with small constellations of actors but turned out to be complex arenas, mainly involving disagreement regarding the benefits. Land ownership proved to be a crucial factor in explaining the differences between the arrangements. Our results also show that benefits do not change communities’ attitudes towards conservation, thus questioning incentive-based policies for conservation. We argue for a careful analysis of the complex social, cultural and political contexts in which conservation and development policies are implemented, to better understand their outcomes.
PTSD or not PTSD? Comparing the proposed ICD-11 and the DSM-5 PTSD criteria among young survivors of the 2011 Norway attacks and their parents
Authors: Hafstad G. S. , Thoresen S. , Wentzel-Larsen T. , Maercker A. , Dyb G. 
Published: January 2017

BackgroundThe conceptualization of post-traumatic stress disorder (PTSD) in the upcoming International Classification of Diseases (ICD)-11 differs in many respects from the diagnostic criteria in the Diagnostic and Statistical Manual for Mental Disorders, fifth edition (DSM-5). The consequences of these differences for individuals and for estimation of prevalence rates are largely unknown. This study investigated the concordance of the two diagnostic systems in two separate samples at two separate waves.MethodYoung survivors of the 2011 Norway attacks (n = 325) and their parents (n = 451) were interviewed at 4–6 months (wave 1) and 15–18 months (wave 2) after the shooting. PTSD was assessed with the UCLA PTSD Reaction Index for DSM-IV adapted for DSM-5, and a subset was used as diagnostic criteria for ICD-11.ResultsIn survivors, PTSD prevalence did not differ significantly at any time point, but in parents, the DSM-5 algorithm produced significantly higher prevalence rates than the ICD-11 criteria. The overlap was fair for survivors, but amongst parents a large proportion of individuals met the criteria for only one of the diagnostic systems. No systematic differences were found between ICD-11 and DSM-5 in predictive validity.ConclusionsThe proposed ICD-11 criteria and the DSM-5 criteria performed equally well when identifying individuals in distress. Nevertheless, the overlap between those meeting the PTSD diagnosis for both ICD-11 and DSM-5 was disturbingly low, with the ICD-11 criteria identifying fewer people than the DSM-5. This represents a major challenge in identifying individuals suffering from PTSD worldwide, possibly resulting in overtreatment or unmet needs for trauma-specific treatment, depending on the area of the world in which patients are being diagnosed.
Structural correlates of trait impulsivity in patients with bipolar disorder and healthy controls: a surface-based morphometry study
Authors: Tu P. C. , Kuan Y. H. , Li C. T. , Su T. P. 
Published: January 2017

BackgroundPatients with bipolar disorder (BD) frequently exhibit impulsive behaviors independent of their mood state, and trait impulsivity is increasingly recognized as a crucial BD biomarker. This study aimed to investigate structural correlates of trait impulsivity measured using the Barratt Impulsiveness Scale (BIS) in healthy controls (HCs) and patients with BD.MethodWe recruited 59 patients diagnosed with BD I or BD II (35.3 ± 8.5 years) and 56 age- and sex-matched HCs (33.9 ± 7.4 years). Participants underwent structural magnetic resonance imaging and clinical evaluations, and their BIS scores were evaluated. An automated surface-based method (FreeSurfer) was used to measure cortical thickness and generate thickness maps for each participant. Brain-wise regression analysis of the association between cortical thickness and BIS scores was performed separately for BD and HC groups by using a general linear model.ResultsPatients with BD obtained significantly higher BIS scores than HCs. In HCs, higher BIS scores were associated with a thinner cortex in the left inferior, middle and medial frontal cortices. By contrast, in BD patients, higher BIS scores were associated with a thicker cortex in the right insula. Patients with BD showed a thinner cortex than HCs in all these four structures.ConclusionsThe findings indicate that the left prefrontal cortex plays a cardinal role in trait impulsivity of healthy individuals. Patients with BD have a different structural correlate of trait impulsivity in the right insula. However, the use of various psychotropics in patients with BD may limit our interpretation of BD findings.
Meanings of Waves: Electroencephalography and Society in Mexico City, 1940–1950
Authors: Pérez Nuria Valverde 
Published: January 2017

ArgumentThis paper focuses on the uses of electroencephalograms (EEGs) in Mexico during their introductory decade from 1940 to 1950. Following Borck (2006), I argue that EEGs adapted to fit local circumstances and that this adjustment led to the consolidation of different ways of making science and the emergence of new objects of study and social types. I also maintain that the way EEGs were introduced into the institutional networks of Mexico entangled them in discussions about the objective and juridical definitions of social groups, thereby preempting concerns about their technical and epistemic limitations. This ultimately enabled the use of EEGs as normative machines and dispositifs. To this end, the paper follows the arrival of EEGs and the creation of institutional networks then analyzes the extent to which the styles of thinking behind the uses of EEGs and attempts to reify a notion of normal electrical brain behavior—particularly by applying EEGs to a community of Otomí Indians—correlated with the difficulties of defining the socio-anthropological notions that articulated legal and disciplinary projects of the time. Finally, it unveils the shortcomings of alternative attempts to define a brain model and to resist the production of ontological determinations.
Reduced perchlorate in West Antarctica snow during stratospheric ozone hole
Authors: Crawford T.Z. , Kub Alexandria D. , Peterson Kari M. , Cox Thomas S. , Cole-Dai Jihong 
Published: January 2017

AbstractSnowpit samples collected at the West Antarctic Ice Sheet (WAIS) Divide location in January 2013 were analysed to investigate the levels and variations of perchlorate concentrations in Antarctic snow. During 2008–12, the perchlorate concentration in WAIS Divide snow ranged between 6–180 ng l–1 and followed a seasonal cycle. The highest concentrations appeared in the autumn, and the lowest in winter and spring. No apparent correlation was observed between perchlorate and nitrate or chloride concentrations in snow. Since perchlorate is believed to form in the atmosphere when chlorine species are oxidized in reactions involving ozone, perchlorate concentrations were hypothesized to be high during the spring, based on the assumption that stratospheric ozone depletion enhances tropospheric perchlorate production. The data show that perchlorate concentrations in snow were sharply reduced during stratospheric ozone depletion events; the evidence, therefore, does not support the hypothesis. Instead, the results suggest a stratospheric origin of perchlorate in Antarctic snow.
Functional tricuspid stenosis: a rare presentation of suspected rhabdomyoma as congenital cyanotic heart disease
Authors: Nair Anishkumar , Rajesh Gopalan Nair , Sajeev Chakanalil Govindan 
Published: January 2017

AbstractCardiac tumours in newborns are often asymptomatic and can be sporadically detected on routine screening unless they result in intractable arrhythmias or haemodynamically significant obstructions causing heart failure. Their presentation as a cause of congenital cyanosis is never anticipated. We report a rare case of a newborn presenting with congenital cyanosis consequent to suspected cardiac rhabdomyoma causing tricuspid inflow obstruction. Our experience with this patient with two large cardiac masses illustrates the significance of its inclusion in the differential diagnosis of perinatal cyanosis, as early detection and surgical management might be the only lifesaving options, if performed well in time.
Transcatheter closure of secundum atrial septal defects: has fear of device erosion altered outcomes?
Authors: Mitchelson Bryan , O’Donnell Clare , Ruygrok Peter , Wright John , Stirling John , Wilson Nigel 
Published: January 2017

AbstractBackgroundTranscatheter device closure has become the established standard of care for suitable atrial septal defects. Device erosion has been a recent focus and has prompted changes in the Instructions for Users documentation released by device companies. We reviewed our entire local experience with atrial septal defect device closure, focussing on the evolution of this procedure in our centre and particularly on complications.MethodsWe carried out a retrospective review of 581 consecutive patients undergoing attempted transcatheter device closure of an atrial septal defect in Auckland from December 1997 to June 2014. We reviewed all complications recorded and compared our outcomes with the current literature. We sought to understand the impact of the evolution in recommendations and clinical practice on patient outcomes in our programme.ResultsThere were a total of 24 complications (4.1%), including 10 device embolisations (1.7%), nine arrhythmias (1.5%), two significant vascular access-related complications (0.3%), one device erosion (0.2%), one malposed device (0.2%), and one probable wire perforation of the left atrial appendage (0.2%). There was one mortality related to device embolisation. All device embolisations occurred following the change in Instructions for Users after publication of the first device erosion report in 2004. This increase in embolisation rate was statistically significant (p-value 0.015).ConclusionsIn our series, the incidence of device embolisation was higher than that anticipated, with a significant increase following changes to the Instructions for Users. This highlights the need for ongoing data collection on complication incidence and for ongoing review of the impact of changes in clinical practice on complication rates.
Point catheter ablation of macro-re-entrant ventricular tachycardia in a patient after surgical repair for double-outlet right ventricle
Authors: Izumi Gaku , Yokoshiki Hisashi , Takeda Atsuhito 
Published: January 2017

AbstractCatheter ablation of ventricular tachycardia is often difficult in patients after surgery for CHD. In patients with a ventricular septal defect patch, it is necessary to decide which ventricular side is appropriate for catheter ablation. In this article, we report a case of successful point catheter ablation of re-entrant ventricular tachycardia. Identification of the ventricular septal defect patch using intra-cardiac echocardiography was useful.
Predicting Cognitive Decline across Four Decades in Mutation Carriers and Non-carriers in Autosomal-Dominant Alzheimer’s Disease
Authors: Almkvist Ove , Rodriguez-Vieitez Elena , Thordardottir Steinunn , Amberla Kaarina , Axelman Karin , Basun Hans , Kinhult-Ståhlbom Anne , Lilius Lena , Remes Anne , Wahlund Lars-Olof , Viitanen Matti , Lannfelt Lars , Graff Caroline 
Published: January 2017

AbstractObjectives: The aim of this study was to investigate cognitive performance including preclinical and clinical disease course in carriers and non-carriers of autosomal-dominant Alzheimer’s disease (adAD) in relation to multiple predictors, that is, linear and non-linear estimates of years to expected clinical onset of disease, years of education and age. Methods: Participants from five families with early-onset autosomal-dominant mutations (Swedish and Arctic APP, PSEN1 M146V, H163Y, and I143T) included 35 carriers (28 without dementia and 7 with) and 44 non-carriers. All participants underwent a comprehensive clinical evaluation, including neuropsychological assessment at the Memory Clinic, Karolinska University Hospital at Huddinge, Stockholm, Sweden. The time span of disease course covered four decades of the preclinical and clinical stages of dementia. Neuropsychological tests were used to assess premorbid and current global cognition, verbal and visuospatial functions, short-term and episodic memory, attention, and executive function. Results: In carriers, the time-related curvilinear trajectory of cognitive function across disease stages was best fitted to a formulae with three predictors: years to expected clinical onset (linear and curvilinear components), and years of education. In non-carriers, the change was minimal and best predicted by two predictors: education and age. The trajectories for carriers and non-carriers began to diverge approximately 10 years before the expected clinical onset in episodic memory, executive function, and visuospatial function. Conclusions: The curvilinear trajectory of cognitive functions across disease stages was mimicked by three predictors in carriers. In episodic memory, executive and visuospatial functions, the point of diverging trajectories occurred approximately 10 years ahead of the clinical onset compared to non-carriers. (JINS, 2017, 23, 195–203)
Association of BMI with risk of CVD mortality and all-cause mortality
Authors: Kee Chee Cheong , Sumarni Mohd Ghazali , Lim Kuang Hock , Selvarajah Sharmini , Haniff Jamaiyah , Tee Guat Hiong Helen , Gurpreet Kaur , Faudzi Yusoff Ahmad , Amal Nasir Mustafa 
Published: January 2017

AbstractObjectiveTo determine the relationship between BMI and risk of CVD mortality and all-cause mortality among Malaysian adults.DesignPopulation-based, retrospective cohort study. Participants were followed up for 5 years from 2006 to 2010. Mortality data were obtained via record linkages with the Malaysian National Registration Department. Multiple Cox regression was applied to compare risk of CVD and all-cause mortality between BMI categories adjusting for age, gender and ethnicity. Models were generated for all participants, all participants the first 2 years of follow-up, healthy participants, healthy never smokers, never smokers, current smokers and former smokers.SettingAll fourteen states in Malaysia.SubjectsMalaysian adults (n 32 839) aged 18 years or above from the third National Health and Morbidity Survey.ResultsTotal follow-up time was 153 814 person-years with 1035 deaths from all causes and 225 deaths from CVD. Underweight (BMI<18·5 kg/m2) was associated with a significantly increased risk of all-cause mortality, while obesity (BMI ≥30·0 kg/m2) was associated with a heightened risk of CVD mortality. Overweight (BMI=25·0–29·9 kg/m2) was inversely associated with risk of all-cause mortality. Underweight was significantly associated with all-cause mortality in all models except for current smokers. Overweight was inversely associated with all-cause mortality in all participants. Although a positive trend was observed between BMI and CVD mortality in all participants, a significant association was observed only for severe obesity (BMI≥35·0 kg/m2).ConclusionsUnderweight was associated with increased risk of all-cause mortality and obesity with increased risk of CVD mortality. Therefore, maintaining a normal BMI through leading an active lifestyle and healthy dietary habits should continue to be promoted.
Connecting supermarkets and farms: the role of intermediaries in Walmart China's fresh produce supply chains
Authors: Michelson Hope , Boucher Stephen , Cheng Xinzhe , Huang Jikun , Jia Xiangping 
Published: January 2017

AbstractThis paper identifies and describes the recent emergence of a new class of private sector intermediaries in fresh fruit and vegetable (FFV) supermarket supply chains in China. These intermediaries play key roles that determine the ways in which farm households participate in and the benefits they derive from new retail-led market opportunities associated with the supermarket sector's shift from FFV procurement through wholesale markets towards more direct contracting with farm communities. This paper provides a comprehensive description of 198 FFV supply chain intermediaries working with Walmart China in 2014, including their historical background, infrastructure investments, downstream marketing and upstream sourcing. We find that these actors play an increasingly critical role in the organization of land, labor and production through contracts. Our study provides critical insights for understanding both the trends in vertical coordination of China's developing agricultural sector and the pace of the country's agricultural modernization. Walmart is a leading international supermarket chain with a growing presence in China, and evidence suggests that their supply chain strategies are similar to other large supermarkets in the region. Results are also relevant to understanding current challenges in China related to food safety and quality, a top priority in recent years.