bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analysis Process for Different Polymere Electrolyte Fuel Cell Stacks to Derive a Control Strategy Based on Impedance Data
Authors: Keller S. , Popenheim A. , Hempel M. , Gläsker K. , Manoli Y. 
Published: October 2014

AbstractTo further the development of polymer electrolyte membrane (PEM) fuel cells control strategies must be developed and optimized. In this study, an analysis process to derive a control strategy based on impedance data is developed and investigated. For this purpose an air cooled stack consisting of 12 cells and developed at Fraunhofer ISE was investigated. Impedance spectra were measured at different operating conditions to identify relevant frequencies at which an online control algorithm should be developed. A comparison of the impedance data between the analyzed stack and commercially available stacks of both air cooled and liquid cooled architectures suggest that the usable frequency ranges are independent of the stack. Hence, the presented analysis process is not limited to a specific stack design and yields a measure for the fuel cell's state of health that does not need information of a complete spectrum, but rather uses impedance data at a few discrete frequencies as control input.
Photopiezoelectric Composites of Azobenzene‐Functionalized Polyimides and Polyvinylidene Fluoride
Authors: Wie Jeong Jae , Wang David H. , Tondiglia Vincent P. , Tabiryan Nelson V. , Vergara‐Toloza Rafael O. , Tan Loon‐Seng , White Timothy J. 
Published: October 2014

Light is a readily available and sustainable energy source. Transduction of light into mechanical work or electricity in functional materials, composites, or systems has other potential advantages derived from the ability to remotely, spatially, and temporally control triggering by light. Toward this end, this work examines photoinduced piezoelectric (photopiezoelectric) effects in laminate composites prepared from photoresponsive polymeric materials and the piezoelectric polymer polyvinylidene fluoride (PVDF). In the geometry studied here, photopiezoelectric conversion is shown to strongly depend on the photomechanical properties inherent to the azobenzene‐functionalized polyimides. Based on prior examinations of photomechanical effects in azobenzene‐functionalized polyimides, this investigation focuses on amorphous materials and systematically varies the concentration of azobenzene in the copolymers. The baseline photomechanical response of the set of polyimides is characterized in cantilever deflection experiments. To improve the photomechanical response of the materials and enhance the electrical conversion, the polyimides are drawn to increase the magnitude of the deflection as well as photogenerated stress. In laminate composites, the photomechanical response of the materials in sequenced light exposure is shown to transduce light energy into electrical energy. The frequency of the photopiezoelectric response of the composite can match the frequency of the sequenced light exposing the films.
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Effects of food processing on polyphenol contents: A systematic analysis using Phenol‐Explorer data
Authors: Rothwell Joseph A. , Medina‐Remón Alexander , Pérez‐Jiménez Jara , Neveu Vanessa , Knaze Viktoria , Slimani Nadia , Scalbert Augustin 
Published: October 2014

ScopeThe Phenol‐Explorer web database (http://www.phenol‐explorer.eu) was recently updated with new data on polyphenol retention due to food processing. Here, we analyze these data to investigate the effect of different variables on polyphenol content and make recommendations aimed at refining estimation of intake in epidemiological studies.Methods and resultsData on the effects of processing upon 161 polyphenols compiled for the Phenol‐Explorer database were analyzed to investigate the effects of polyphenol structure, food, and process upon polyphenol loss. These were expressed as retention factors (RFs), fold changes in polyphenol content due to processing. Domestic cooking of common plant foods caused considerable losses (median RF = 0.45–0.70), although variability was high. Food storage caused fewer losses, regardless of food or polyphenol (median RF = 0.88, 0.95, 0.92 for ambient, refrigerated, and frozen storage, respectively). The food under study was often a more important determinant of retention than the process applied.ConclusionPhenol‐Explorer data enable polyphenol losses due to processing from many different foods to be rapidly compared. Where experimentally determined polyphenol contents of a processed food are not available, only published RFs matching at least the food and polyphenol of interest should be used when building food composition tables for epidemiological studies.
Hydrologic Variability Influences Local Probability of Pallid Sturgeon Occurrence in a Missouri River Tributary
Authors: Hamel M. J. , Spurgeon J. J. , Pegg M. A. , Hammen J. J. , Rugg M. L. 
Published: October 2014

AbstractA river's flow regime creates and maintains spatial variability in habitat and dictates the distribution and abundance of riverine fishes. Changes to patterns of natural hydrologic variation and disturbance create novel flow conditions and may influence distribution of native fishes. We examined local and regional‐scale factors that influenced the presence of pallid sturgeon Scaphirhynchus albus in the Platte River, a large tributary to the Missouri River in Nebraska, USA. Daily river discharge, diel flow variability, season and location in the study area were the most supported variables in logistic regression models explaining pallid sturgeon distribution. The probability of pallid sturgeon occurrence was greatest during periods of high discharge (>90th percentile flows) in the spring and fall. Pallid sturgeon occurrence was always lower when variability in diel flow patterns was high (i.e. hydropeaking). Our results indicate that pallid sturgeon use of the lower Platte River was strongly tied to the flow regime. Therefore, the lower Platte River may provide an opportunity to preserve and restore sturgeon and possibly other large‐river fishes through appropriate water management strategies. Copyright © 2014 John Wiley & Sons, Ltd.
Computed Tomography‐Based Assessment of Abdominal Adiposity Changes and Their Impact on Metabolic Alterations Following Bariatric Surgery
Authors: Galanakis Christos G. , Daskalakis Markos , Manios Andreas , Xyda Argyro , Karantanas Apostolos H. , Melissas John 
Published: October 2014

AbstractBackground
The aim of this study was to evaluate the effects of surgically induced weight loss on the abdominal adipose tissue depots and the metabolic profile in morbidly obese (MO) patients.MethodsThe study was performed with a semi‐automated quantification of adipose tissue compartments on single‐slice abdominal CT series before surgery, 6 and 12 months after bariatric surgery. Thirty‐eight MO patients with mean age of 35.7 ± 10.1 years and mean body mass index (BMI) of 43.6 ± 6.5 kg/m2 were studied (20 patients underwent gastric banding and 18 patients underwent sleeve gastrectomy). Anthropometric measurements, metabolic and inflammatory parameters were analyzed in each patient.ResultsMarkedly decreased levels of total abdominal adipose tissue, abdominal subcutaneous adipose tissue (AbSAT) and visceral adipose tissue (VAT) at 6 and 12 months were noted in comparison to the preoperative values. The total % reduction of VAT was significant higher in comparison to the total % reduction of AbSAT at 12 months after bariatric surgery (P < 0.01) with the mean ratio of AbSAT/VAT to increase from 4.1 ± 1.7 preoperatively to 6.2 ± 3.1 at 12 months postoperatively (P < 0.001). In addition, high‐sensitivity C‐reactive protein (hsCRP) decreased significantly with weight loss after bariatric surgery and the total abdominal lipid loss was related to the decrease in hsCRP.ConclusionsSignificant changes in abdominal lipid deposition occurred in MO patients 6 and 12 months after bariatric surgery. The changes were significantly, correlated with the magnitude of BMI loss. The fat redistribution may contribute to the improvements in metabolic abnormalities.
Confined flow of suspensions modelled by a frictional rheology
Authors: Lecampion Brice , Garagash Dmitry I. 
Published: October 2014

AbstractWe investigate in detail the problem of confined pressure-driven laminar flow of neutrally buoyant non-Brownian suspensions using a frictional rheology based on the recent proposal of Boyer et al. (Phys. Rev. Lett., vol. 107 (18), 2011, 188301). The friction coefficient (shear stress over particle normal stress) and solid volume fraction are taken as functions of the dimensionless viscous number $I$ defined as the ratio between the fluid shear stress and the particle normal stress. We clarify the contributions of the contact and hydrodynamic interactions on the evolution of the friction coefficient between the dilute and dense regimes reducing the phenomenological constitutive description to three physical parameters. We also propose an extension of this constitutive framework from the flowing regime (bounded by the maximum flowing solid volume fraction) to the fully jammed state (the random close packing limit). We obtain an analytical solution of the fully developed flow in channel and pipe for the frictional suspension rheology. The result can be transposed to dry granular flow upon appropriate redefinition of the dimensionless number $I$. The predictions are in excellent agreement with available experimental results for neutrally buoyant suspensions, when using the values of the constitutive parameters obtained independently from stress-controlled rheological measurements. In particular, the frictional rheology correctly predicts the transition from Poiseuille to plug flow and the associated particles migration with the increase of the entrance solid volume fraction. We also numerically solve for the axial development of the flow from the inlet of the channel/pipe toward the fully developed state. The available experimental data are in good agreement with our numerical predictions, when using an accepted phenomenological description of the relative phase slip obtained independently from batch-settlement experiments. The solution of the axial development of the flow notably provides a quantitative estimation of the entrance length effect in a pipe for suspensions when the continuum assumption is valid. Practically, the latter requires that the predicted width of the central (jammed) plug is wider than one particle diameter. A simple analytical expression for development length, inversely proportional to the gap-averaged diffusivity of a frictional suspension, is shown to encapsulate the numerical solution in the entire range of flow conditions from dilute to dense.
Tolerance and the effect of high doses of wheat bran extract, containing arabinoxylan–oligosaccharides, and oligofructose on faecal output: a double-blind, randomised, placebo-controlled, cross-over trial
Authors: François Isabelle E. J. A. , Lescroart Olivier , Veraverbeke Wim S. , Windey Karen , Verbeke Kristin , Broekaert Willem F. 
Published: October 2014

AbstractWheat bran extract (WBE) is a food-grade soluble fibre preparation that is highly enriched in arabinoxylan–oligosaccharides. In this placebo-controlled cross-over human intervention trial, tolerance to WBE as well as the effects of WBE on faecal parameters, including faecal output and bowel habits, were studied. After a 2-week run-in period, twenty healthy volunteers consumed WBE (15 g/d in the first week, 30 g/d in the second week), oligofructose (15 g/d in the first week, 30 g/d in the second week) and placebo (for 2 weeks) in a random order, with 2-week washout periods between each treatment period. Subjects collected a 72 h stool sample for analysis of faecal output, stool pH and stool moisture concentration. Additionally, the volunteers completed questionnaires scoring occurrence frequency and distress severity of eighteen gastrointestinal (GI) symptoms. An overall GI symptom measure was calculated to analyse the overall effect of WBE and oligofructose on GI symptoms. Intake of both 30 g/d WBE and 30 g/d oligofructose lowered stool pH, indicative of increased colonic fermentation, and increased stool moisture concentration as compared with placebo intake. Intake of 30 g/d oligofructose increased the overall GI symptom measure by 1·9-fold as compared with placebo intake. Intake of WBE at doses up to 30 g/d did not affect the overall GI symptom measure. WBE exerts beneficial effects on stool characteristics and is well tolerated at up to 30 g/d. Oligofructose exerts comparable beneficial effects on stool characteristics. However, intake of 30 g/d oligofructose appears to cause GI discomfort to some extent.
REHABILITATING THE HOARD: THE SOCIAL DYNAMICS OF UNBANKING IN AFRICA AND BEYOND
Authors: Peebles Gustav 
Published: October 2014

ABSTRACTIf a thriving capitalist economy relies on the innumerable small deposits of savings that local people place in banks, then ‘unbanking’ represents a threat to just such an economy. And yet, across the globe, billions remain outside the formal banking sector, thereby reducing the ability of formal banks to set these savings in motion. This unbanking has been the subject of many reports and studies by economists, corporations and non-profit organizations, but unbanking never seems to diminish. Indeed, by all accounts, it continues to thrive. In order to offer an alternative explanation for this phenomenon, the author revives an important, age-old distinction between hoarding and saving, while also providing an anthropological survey of alternative modes of saving in Africa. In so doing, the author argues that the critics of unbanking may be ignoring the ways in which banking and unbanking are tied up with subject formation.
Alleviation of solar ultraviolet radiation (UVR)-induced photoinhibition in diatom Chaetoceros curvisetus by ocean acidification
Authors: Chen Heng , Guan Wanchun , Zeng Guoquan , Li Ping , Chen Shaobo 
Published: October 2014

The study aimed to unravel the interaction between ocean acidification and solar ultraviolet radiation (UVR) in Chaetoceros curvisetus. Chaetoceros curvisetus cells were acclimated to high CO2 (HC, 1000 ppmv) and low CO2 concentration (control, LC, 380 ppmv) for 14 days. Cell density, specific growth rate and chlorophyll were measured. The acclimated cells were then exposed to PAB (photosynthetically active radiation (PAR) + UV-A + UV-B), PA (PAR + UV-A) or P (PAR) for 60 min. Photochemical efficiency (ΦPSII), relative electron transport rate (rETR) and the recovery of ΦPSII were determined. HC induced higher cell density and specific growth rate compared with LC. However, no difference was found in chlorophyll between HC and LC. Moreover, ΦPSII and rETRs were higher under HC than LC in response to solar UVR. P exposure led to faster recovery of ΦPSII, both under HC and LC, than PA and PAB exposure. It appeared that harmful effects of UVR on C. curvisetus could be counteracted by ocean acidification simulated by high CO2 when the effect of climate change is not beyond the tolerance of cells.
Shedding of norovirus in symptomatic and asymptomatic infections
Authors: TEUNIS P. F. M. , SUKHRIE F. H. A. , VENNEMA H. , BOGERMAN J. , BEERSMA M. F. C. , KOOPMANS M. P. G. 
Published: October 2014

SUMMARYNorovirus is the most frequent cause of acute infectious gastroenteritis and it is difficult to control in crowded environments like hospitals and nursing homes. Transmission depends on oral intake of virus deposited in the environment by infectious subjects. Data from volunteer studies indicate that virus concentrations in stool are highly variable, but systematic studies of the time-course of shedding and its individual variation are lacking. This paper quantifies norovirus shedding in a large population of 102 subjects, including asymptomatic shedders, and uses a longitudinal model to generalize shedding patterns. Enhanced surveillance for studies of transmission of norovirus in hospital outbreaks has yielded a considerable number of faecal samples from symptomatic and asymptomatic shedders, both from patients and staff. Norovirus concentrations were determined by real-time PCR. A quantitative dynamic model was fitted to the shedding data, in a multilevel Bayesian framework, to study the time-course of shedding and its variation. The results indicate that shedding in asymptomatic subjects is similar to that in symptomatic infections, both showing considerable variation in peak levels (average 105−109/g faeces) as well as duration of virus shedding (average 8–60 days). Patients appear to shed higher numbers of virus than staff, for slightly longer durations, but the differences are too small to be significant. Given equal shedding, the greater contribution of symptomatic cases to transmission must be caused by their higher efficiency in spreading these viruses. The results of this study will be helpful for risk studies that need to quantify the deposition of virus in the environment.
Practitioner consensus on the determinants of capacity building practice in high-income countries
Authors: Swanepoel Elizabeth , Fox Ann , Hughes Roger 
Published: October 2014

AbstractObjectiveTo assess and develop consensus among experienced public health nutrition practitioners from high-income countries regarding conceptualisation of capacity building in practice, and to test the content validity of a previously published conceptual framework for capacity building in public health nutrition practice.DesignA Delphi study involving three iterations of email-delivered questionnaires testing a range of capacity determinants derived from the literature. Consensus was set at >50 % of panellists ranking items as ‘very important’ on a five-point Likert scale across three survey rounds.SettingPublic health nutrition practice in Australia, the UK, Canada and the USA.SubjectsPublic health nutrition practitioners and academics.ResultA total of thirty expert panellists (68 % of an initial panel of forty-four participants) completed all three rounds of Delphi questionnaires. Consensus identified determinants of capacity building in practice including partnerships, resourcing, community development, leadership, workforce development, intelligence and quality of project management.ConclusionsThe findings from the study suggest there is broad agreement among public health nutritionists from high-income countries about how they conceptualise capacity building in public health nutrition practice. This agreement suggests considerable content validity for a capacity building conceptual framework proposed by Baillieet al. (Public Health Nutr12, 1031–1038). More research is needed to apply the conceptual framework to the implementation and evaluation of strategies that enhance the practice of capacity building approaches by public health nutrition professionals.
Meanings of eating deficiencies for people admitted to palliative home care
Authors: Wallin Viktoria , Carlander Ida , Sandman P.-O. , Håkanson Cecilia 
Published: October 2014

AbstractObjective:Food and eating are embedded in people's everyday social lives: at home with family members and as part of social interactions. For people with progressive life-limiting conditions, however, eating is often obstructed. The objective of the present study was to explore the meanings of living with eating deficiencies at the end of life among people admitted to specialist palliative home care.Method:This qualitative inductive study employed an interpretive descriptive approach. A dozen persons, with various diagnoses and eating deficiencies, admitted to two specialist palliative home care units, participated. Data were collected through individual repeated interviews. Data collection and analysis were guided by the interpretive description method.Results:The results reveal that eating deficiencies among people with progressive life-limiting conditions are existentially loaded markers of impending death. Finding ways to overcome declined food intake and hampered eating enabled our participants to feel able to influence their own well-being and remain hopeful. The results also showed that the eating deficiencies influenced participants' relationships and social interactions in ways that hampered their possibilities of sharing valuable moments together with friends and family members during the final period of life.Significance of Results:Efforts to minimize the distress that people experience in relation to the challenges they face with eating deficiencies are important for well-being at the end of life. Person-centered approaches to acknowledge and support individuals' own ways of experiencing and dealing with their eating deficiencies are recommended that include a multidimensional perspective on food and eating.
LAMTOR2 regulates dendritic cell homeostasis through FLT3-dependent mTOR signalling
Authors: Scheffler Julia M. , Sparber Florian , Tripp Christoph H. , Herrmann Caroline , Humenberger Alexandra , Blitz Johanna , Romani Nikolaus , Stoitzner Patrizia , Huber Lukas A. 
Published: October 2014

AbstractThe receptor tyrosine kinase Flt3 and its ligand are crucial for dendritic cell (DC) homeostasis by activating downstream effectors including mammalian target of Rapamycin (mTOR) signalling. LAMTOR2 is a member of the Ragulator/LAMTOR complex known to regulate mTOR and extracellular signal-regulated kinase activation on the late endosome as well as endosomal biogenesis. Here we show in mice that conditional ablation of LAMTOR2 in DCs results in a severe disturbance of the DC compartment caused by accumulation of Flt3 on the cell surface. This results in an increased downstream activation of the AKT/mTOR signalling pathway and subsequently to a massive expansion of conventional DCs and plasmacytoid DCs in ageing mice. Finally, we can revert the symptoms in vivo by inhibiting the activation of Flt3 and its downstream target mTOR.
Ice crystals growth driving assembly of porous nitrogen-doped graphene for catalyzing oxygen reduction probed by in situ fluorescence electrochemistry
Authors: Wang Jiong , Wang Huai-Song , Wang Kang , Wang Feng-Bin , Xia Xing-Hua 
Published: October 2014

AbstractIn recent years, doped carbonaceous materials as alternative catalysts for oxygen reduction reaction (ORR) have received considerable attention due to the low cost and high CO tolerance capability. Different theoretical studies have suggested that oxygen is reduced in a rapid sequence intermediated by diverse oxygen-containing reactive intermediates (ORI). However, due to the short lifetimes of the possible ORI, direct experimental evidence is very difficult to be obtained. Here, we report the synthesis of an ultralight and porous nitrogen-doped graphene (NG) by annealing graphite oxide (GO)-melamine scaffold shaped in ice template. The resultant NG exhibits excellent electrocatalytic activity toward 4e-reduction of oxygen with the onset potential as low as −0.05 V vs. Ag/AgCl in alkaline media. Using this material as model study, sensitive in situ fluorescence spectroelectrochemistry is applied to demonstrate the presence the reactive ORI. The global ORR pathway is unraveled as stepwise electron transfer involving hydroxyl radical as the important intermediate via both inner- and outer-sphere process. This result would likely provide a new insight into the further understanding of ORR mechanism on those intrinsic carbonaceous materials.