bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effects of aramid honeycomb core on the flame retardance and mechanical property for isocyanate‐based polyimide foams
Authors: Sun Gaohui , Wang Wenpeng , Wang Leichao , Yang Zuodong , Liu Lianhe , Wang Jun , Ma Ning , Wei Hao , Han Shihui 
Published: March 2017

ABSTRACTIn this work, composite materials containing aramid honeycomb core (ARHC) reinforced isocyanate‐based polyimide foams (IBPIFs) were prepared by a simple free‐foaming process. The flame retardance, smoke performance, and mechanical property of the composite materials along the transverse (W) and longitude (L) directions of ARHC were studied. Results of limiting oxygen index and cone calorimeter reveal that the space partition action of ARHC on IBPIFs, barrier action of honeycomb structure on fire, and generation of straight, flurry and porous char layer in the honeycomb cells during combustion effectively enhanced the flame retardance of IBPIFs. Mechanical property test shows that IBPIFs and ARHC presented a positive synergetic effect, and ARHC increased the compression strength of IBPIFs along the W and L directions of ARHC by approximately 300%. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45041.
Replacement of styrene with acrylated epoxidized soybean oil in an unsaturated polyester resin from propylene glycol and maleic anhydride
Authors: Wu Yili , Li Kaichang 
Published: March 2017

ABSTRACTA nonvolatile, vegetable‐oil based chemical, acrylated epoxidized soybean oil (AESO) was investigated as a replacement of volatile and toxic styrene in one of commercial UPE resins styrene‐(PG‐MA) that is a mixture of styrene and a UPE plastic from propylene glycol and maleic anhydride (PG‐MA). Neither AESO nor PG‐MA was capable of forming a strong matrix, respectively, for glass fiber‐reinforced composites. However, a mixture of AESO and PG‐MA resulted in glass fiber‐reinforced AESO‐(PG‐MA) composites that were comparable or even superior to those from styrene‐(PG‐MA) in terms of the flexural and tensile properties. Effects of AESO contents on the mechanical and viscoelastic properties of the glass fiber‐reinforced AESO‐(PG‐MA) composites were investigated. Resin viscosity and resin pot life as a function of temperature were studied. The curing mechanism of the AESO‐(PG‐MA) resins is also discussed. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45056.
Enhancement of Oxygen Activation and Mobility in CaTixFe1−xO3−δ Oxides
Authors: Répécaud Pierre‐Alexis , Kaper Helena , Richard Mélissandre , Can Fabien , Bion Nicolas 
Published: March 2017

AbstractThe study of oxygen activation and mobility in CaTi0.9Fe0.1O3−δ was investigated by using the isotopic exchange technique. The thermomechanical and chemical stability of CaTi0.9Fe0.1O3−δ makes it a promising mixed ionic and electronic conducting oxide for catalytic membrane reactors. However, its oxygen flux performance is still lower than that of reference membranes. Two strategies were studied to improve oxygen transport in this perovskite oxide, that is, higher Fe doping and utilization of a dual‐bed system composed of LaMnO3/CaTi0.9Fe0.1O3−δ.
Synthesis of Three‐Dimensional Nitrogen and Sulfur Dual‐Doped Graphene Aerogels as an Efficient Metal‐Free Electrocatalyst for the Oxygen Reduction Reaction
Authors: Chabu Johnny Muya , Wang Liqiang , Tang Fei‐Ying , Zeng Ke , Sheng Jianping , Walle Maru Dessie , Deng Liu , Liu You‐Nian 
Published: March 2017

AbstractThree‐dimensional (3D) nitrogen and sulfur dual‐doped graphene aerogels (NSGAs) are successfully synthesized by using a rational hydrothermal self‐assembly process with ammonia and sulfur powder as nitrogen and sulfur sources, respectively. Structural characterization, including TEM, HAADF‐STEM, SEM, and XPS indicated that the NSGA catalyst exhibits an interconnected macroporous framework of graphene sheets and tunable contents of N and S. The as‐prepared NSGAs show an excellent electrocatalytic activity for the oxygen reduction reaction, including a highly positive onset potential, high kinetic limiting current density, and fuel tolerance. In particular, the NSGA catalyst reveals a much better long‐term stability than that of Pt/C in alkaline medium.
Ligand Torsion Triggered Two Robust Fe‐Tetratopic Carboxylate Frameworks with Enhanced Gas Uptake and Separation Performance
Authors: Zhang Jian‐Wei , Hu Man‐Cheng , Li Shu‐Ni , Jiang Yu‐Cheng , Zhai Quan‐Guo 
Published: March 2017

AbstractBy regulating the tetratopic carboxylate ligands, two robust Fe‐MOFs (MOF=Metal‐organic framework) comprising trigonal prismatic building blocks under a DMA/DMSO/HBF4 solvent system, namely, [(CH3)2NH2][FeII3(OH)(BPTC)1.5(DMSO)3] (SNNU‐60) and [FeIIIFeII2(OH)(ABTC)1.5(DMSO)3] (SNNU‐61) (BPTC=3,3′,5,5′‐biphenyltetracarboxylic acid, ABTC=3,3′,5,5′‐azobenzenetetracarboxylic acid, SNNU=Shaanxi Normal University) have been successfully synthesized. The torsions between the benzene groups of the ligands result in two MOFs exhibiting completely different (4,6)‐connected frameworks, which represent the only two MOF types constructed by [M3(O/OH)(COO)6] trimeric building units and quadrilateral tetratopic carboxylate linkers until now. The robust Fe‐MOFs SNNU‐60 and SNNU‐61 both exhibit high thermal/chemical stability, permanent microporosity, and excellent gas uptake capability for H2, CO2, C2H2, and C2H4 under 1 bar. SNNU‐60 in particular displays very high C2H2 capture under low pressure (85 cm3 cm−3 at 0.15 bar and 298 K), which is among the top C2H2 uptake MOF materials. Also, these two Fe‐MOFs display high separation for CO2 and C2‐hydrocarbons over CH4. Significantly, thanks to the high stability, suitable pore size, open Fe sites, and ion skeleton, SNNU‐60 has extremely high C2H2/CH4 selectivity (83.6, 298 K), which surpasses most MOFs reported so far under the same conditions.
Semiparametric PCA and bayesian network based process fault diagnosis technique
Authors: Wang Yazhen , Liu Yi , Khan Faisal , Imtiaz Syed 
Published: March 2017

AbstractSemiparametric Principal Component Analysis has advantages over Principal Component Analysis (PCA), as it can deal with nonlinear and non‐monotonic correlation and non‐Gaussian distribution process data. In Semiparametric PCA the distance correlation coefficient matrix is used to replace the covariance matrix, and a semi‐parametric Gaussian transformation is used to allow variables to follow multivariate Gaussian distribution. To reduce the cost of monitoring and alarm flooding, a fault diagnosis technique, which combines Semiparametric PCA and Bayesian Network (BN), is proposed here. In the first stage, Semiparametric PCA is used to find the fault in monitored variables. Considering the interaction of process variables and historical process data, a Bayesian network is developed in the second stage. Considering Semiparametric PCA outcome as evidence, the Bayesian network applies deductive and abductive reasoning to update and analysis, which assist in determining the true root cause(s) and fault propagation pathway. The implementation and applicability of the proposed methodology are demonstrated using three process systems.
The enigma of inhaled salbutamol and sport: unresolved after 45 years
Authors: Fitch Ken D. 
Published: March 2017

During the past 45 years, there have been more changes on the World Anti‐Doping Agency's (WADA) Prohibited List (the List) to the status of inhaled salbutamol than any other substance. With 658 athletes, 6.1% of all participating athletes approved to inhale salbutamol at the 2008 Beijing Games, it is one of the medications used most frequently by Olympic athletes. Nevertheless, since the 2008 Games, WADA has made numerous changes to inhaled salbutamol on the List including prohibiting its use, then a year later permitting it without prior notification and recommending a pharmacokinetic study if an athlete exceeds the urinary threshold of 1000 ng/mL. Recently, an elite athlete undertook two pharmacokinetic studies and the results have raised several questions. These include whether WADA should continue to permit nebulized salbutamol as an acceptable method of inhalation and there is some justification for nebulized salbutamol to be prohibited in sport. Another question is whether the modified advisory on salbutamol in the 2017 List appropriately informs athletes of the risks of exceeding the urinary threshold and the recent changes may not inform athletes optimally. Finally, concern is expressed at the persistent failure of WADA to apply a correction down to a specific gravity of 1.020 when an exogenous substance is identified in the urine of a dehydrated athlete. It is recommended that this should be implemented. Copyright © 2017 John Wiley & Sons, Ltd.
Geomorphic process from topographic form: automating the interpretation of repeat survey data in river valleys
Authors: Kasprak Alan , Caster Joshua , Bangen Sara G. , Sankey Joel B. 
Published: March 2017

AbstractThe ability to quantify the processes driving geomorphic change in river valley margins is vital to geomorphologists seeking to understand the relative role of transport mechanisms (e.g. fluvial, aeolian, and hillslope processes) in landscape dynamics. High‐resolution, repeat topographic data are becoming readily available to geomorphologists. By contrasting digital elevation models derived from repeat surveys, the transport processes driving topographic changes can be inferred, a method termed ‘mechanistic segregation.’ Unfortunately, mechanistic segregation largely relies on subjective and time consuming manual classification, which has implications both for its reproducibility and the practical scale of its application. Here we present a novel computational workflow for the mechanistic segregation of geomorphic transport processes in geospatial datasets. We apply the workflow to seven sites along the Colorado River in the Grand Canyon, where geomorphic transport is driven by a diverse suite of mechanisms. The workflow performs well when compared to field observations, with an overall predictive accuracy of 84% across 113 validation points. The approach most accurately predicts changes due to fluvial processes (100% accuracy) and aeolian processes (96%), with reduced accuracy in predictions of alluvial and colluvial processes (64% and 73%, respectively). Our workflow is designed to be applicable to a diversity of river systems and will likely provide a rapid and objective understanding of the processes driving geomorphic change at the reach and network scales. We anticipate that such an understanding will allow insight into the response of geomorphic transport processes to external forcings, such as shifts in climate, land use, or river regulation, with implications for process‐based river management and restoration. Copyright © 2017 John Wiley & Sons, Ltd.
The impact of community health educators on uptake of cervical and breast cancer prevention services in Nigeria
Authors: Chigbu Chibuike O. , Onyebuchi Azubuike K. , Onyeka Tonia C. , Odugu Boniface U. , Dim Cyril C. 
Published: March 2017

AbstractObjectiveTo determine the impact of trained community health educators on the uptake of cervical and breast cancer screening, and HPV vaccination in rural communities in southeast Nigeria.MethodsA prospective population‐based intervention study, with a before‐and‐after design, involved four randomly selected communities in southeast Nigeria from February 2014 to February 2016. Before the intervention, baseline data were collected on the uptake of cervical and breast cancer prevention services. The intervention was house‐to‐house education on cervical cancer and breast cancer prevention. Postintervention outcome measures included the uptake of cervical and breast cancer screening, and HPV vaccination within 6 months of intervention.ResultsIn total, 1327 women were enrolled. Before the intervention, 42 (3.2%) women had undergone cervical cancer screening; afterwards, 897 (67.6%) women had received screening (P<0.001). Clinical breast examination was performed for 59 (4.4%) women before and 897 (67.6%) after the intervention (P<0.001). Only 2 (0.9%) of 214 children eligible for HPV vaccination had received the vaccine before versus 71 (33.2%) after the intervention (P<0.001).ConclusionThe use of community health educators for house‐to‐house cervical and breast cancer prevention education was associated with significant increases in the uptake of cervical cancer screening, clinical breast examination, and HPV vaccination.
LncRNA XIST Promotes Pancreatic Cancer Proliferation Through miR‐133a/EGFR
Authors: Wei Wei , Liu Yu , Lu Yebin , Yang Bo , Tang Ling 
Published: March 2017

ABSTRACTAccording to recent studies, long non‐coding RNA X‐inactive specific transcript (XIST) is involved in the development and progression of many malignant tumors including pancreatic cancer. We validated the detailed role of XIST in human pancreatic cancer (PC) cell lines and PC tissues so as to determine its exact function and the mechanism by which it affected PC proliferation. In our research, lncRNA‐XIST was specifically upregulated in PC tissues and cell lines, and high XIST expression in PC was related to poorer prognosis (larger tumor size, perineural invasion, lymph node micrometastases, and shorter overall survival). XIST augmented PC cell proliferation. Recently, the interaction between lncRNA and miRNA has been frequently reported to play major role in several biological processes. In the present study, XIST and miR‐133a reciprocally inhibited each other in PC cells. Exogenous miR‐133a expression significantly inhibited PC cell proliferation. Moreover, as exhibited by luciferase reporter gene assays, miR‐133a bound to XIST and the 3′UTR of EGFR by direct targeting. In PC tissues, miR‐133a expression was down‐regulated and EGFR expression was up‐regulated; miR‐133a was inversely correlated with EGFR and XIST, respectively; XIST was positively correlated with EGFR. Taken together, these findings will shed light on the role and mechanism of XIST/miR‐133a/EGFR in regulating PC cells proliferation. XIST may serve as a potential therapeutic target in PC in the future. J. Cell. Biochem. 118: 3349–3358, 2017. © 2017 Wiley Periodicals, Inc.
Wavelet entropy of BOLD time series: An application to Rolandic epilepsy
Authors: Gupta Lalit , Jansen Jacobus F.A. , Hofman Paul A.M. , Besseling René M.H. , de Louw Anton J.A. , Aldenkamp Albert P. , Backes Walter H 
Published: March 2017

PurposeTo assess the wavelet entropy for the characterization of intrinsic aberrant temporal irregularities in the time series of resting‐state blood‐oxygen‐level‐dependent (BOLD) signal fluctuations. Further, to evaluate the temporal irregularities (disorder/order) on a voxel‐by‐voxel basis in the brains of children with Rolandic epilepsy.Materials and MethodsThe BOLD time series was decomposed using the discrete wavelet transform and the wavelet entropy was calculated. Using a model time series consisting of multiple harmonics and nonstationary components, the wavelet entropy was compared with Shannon and spectral (Fourier‐based) entropy. As an application, the wavelet entropy in 22 children with Rolandic epilepsy was compared to 22 age‐matched healthy controls. The images were obtained by performing resting‐state functional magnetic resonance imaging (fMRI) using a 3T system, an 8‐element receive‐only head coil, and an echo planar imaging pulse sequence (
‐weighted). The wavelet entropy was also compared to spectral entropy, regional homogeneity, and Shannon entropy.ResultsWavelet entropy was found to identify the nonstationary components of the model time series. In Rolandic epilepsy patients, a significantly elevated wavelet entropy was observed relative to controls for the whole cerebrum (P = 0.03). Spectral entropy (P = 0.41), regional homogeneity (P = 0.52), and Shannon entropy (P = 0.32) did not reveal significant differences.ConclusionThe wavelet entropy measure appeared more sensitive to detect abnormalities in cerebral fluctuations represented by nonstationary effects in the BOLD time series than more conventional measures. This effect was observed in the model time series as well as in Rolandic epilepsy. These observations suggest that the brains of children with Rolandic epilepsy exhibit stronger nonstationary temporal signal fluctuations than controls.Level of Evidence: 2Technical Efficacy: Stage 3J. Magn. Reson. Imaging 2017;46:1728–1737.
Growth of black brant and lesser snow goose goslings in northern alaska
Authors: Hupp Jerry W. , Ward David H. , Hogrefe Kyle R. , Sedinger James S. , Martin Philip D. , Stickney Alice A. , Obritschkewitsch Tim 
Published: March 2017

ABSTRACTGosling body mass can affect first year survival, recruitment, adult body size, and future fecundity of geese, and can serve as an indicator of forage availability and quality on brood‐rearing areas. From 2012–2014 we measured body mass of 76 black brant (Branta bernicla nigricans) and 268 lesser snow goose (Chen caerulescens caerulescens) goslings of known age on the Colville River Delta (CRD) of northern Alaska to determine if there was evidence of density‐dependent declines in gosling growth following recent population increases of those species and sympatric greater white‐fronted geese (Anser albifrons frontalis). We contrasted contemporary body mass of brant goslings and forage biomass in brood‐rearing habitats that were shared by all species, with measures obtained on, and near the CRD in the 1990s, prior to the establishment of snow goose nesting colonies in the area. Body mass of brant goslings recaptured between 25 and 32 days of age had not changed over the past 2 decades, despite an influx of snow geese, and increases in populations of brant and white‐fronted geese. At 30 days of age, body mass of brant goslings on the CRD was 100–400 g heavier than for brant goslings of the same age on the Yukon‐Kuskokwim Delta (YKD), Alaska. Contemporary biomass of grazedCarex subspathaceaon CRD brood‐rearing areas was comparable to the 1990s and was 2–4 times greater than for the same plant community on the YKD. Historical data on growth of snow goose goslings were not available for the CRD. However, average body mass of 34‐day‐old snow goose goslings was>230 g heavier than for conspecifics of the same age in the Hudson Bay region. We conclude that the establishment of nesting snow geese on the CRD has not negatively affected brant gosling growth, and that recent population increases of all species have likely not been constrained by forage availability on brood‐rearing areas. Barring demographic changes elsewhere in their annual cycles, we predict that goose populations will continue to increase in northern Alaska. However, snow geese are increasing more rapidly than brant in the region. Because the black brant population has periodically been below conservation objectives, the effects of the increasing number of snow geese on forage biomass and growth of brant goslings in northern Alaska should be monitored. © 2017 The Wildlife Society.
Systematic out‐of‐field secondary neutron spectrometry and dosimetry in pencil beam scanning proton therapy
Authors: Trinkl Sebastian , Mares Vladimir , Englbrecht Franz Siegfried , Wilkens Jan Jakob , Wielunski Marek , Parodi Katia , Rühm Werner , Hillbrand Martin 
Published: March 2017

Background and purposeSystematic investigation of the energy and angular dependence of secondary neutron fluence energy distributions and ambient dose equivalents values (H*(10)) inside a pencil beam scanning proton therapy treatment room using a gantry.Materials and methodsNeutron fluence energy distributions were measured with an extended‐range Bonner sphere spectrometer featuring ³He proportional counters, at four positions at 0°, 45°, 90°, and 135° with respect to beam direction and at a distance of 2 m from the isocenter. The energy distribution of secondary neutrons was investigated for initial proton beam energies of 75 MeV, 140 MeV, and 200 MeV, respectively, using a 2D scanned irradiation field of 11 × 11 cm² delivered to a 30 × 30 × 30 cm³ PMMA phantom. Additional measurements were performed at a proton energy of 118 MeV including a 5 cm range‐shifter (PMMA), yielding a Bragg peak position similar to that of 75 MeV protons.ResultsAmbient dose equivalent values from 0.3 μSv/Gy (75 MeV; 90°) to 24 μSv/Gy (200 MeV; 0°) were measured inside the treatment room at a distance of 2 m from the isocenter. H*(10) values were lower (by factors of up to 7.2 (at 45°)) at 75 MeV compared to those at 118 MeV with the 5 cm range‐shifter. At 0° and 45°, an evaporation peak was found in the measured neutron fluence energy distributions, at neutron energies around MeV, which contributes about 50% to total H*(10) values, for all investigated proton beam energies.ConclusionsThis study showed a pronounced increase of secondary neutron H*(10) values inside the proton treatment room with increasing proton energy without beam modifiers. For example, in beam direction this increase was about a factor of 50 when protons of 75 MeV and 200 MeV were compared. The existence of a peak of secondary neutrons in the MeV region was demonstrated in beam direction (0°). This peak is due to evaporation neutrons produced in the existing surrounding materials such as those used for the gantry. Therefore, any simulation of the secondary neutrons within a proton treatment room must take these materials into account. In addition, the results obtained here show that the use of a range‐shifter increases the production of secondary neutrons inside the treatment room. Using a range‐shifter, the higher neutron doses observed mainly result from the higher incident proton energy (118 MeV instead of 75 MeV when no range‐shifter was used), due to higher neutron production cross‐sections.
Registration status and methodological reporting of randomized controlled trials in obesity research: A review
Authors: Byrne Jillian L.S. , Yee Tamara , O'Connor Kathleen , Dyson Michele P. , Ball Geoff D.C. 
Published: March 2017

ObjectiveTo assess registration and reporting details of randomized controlled trials (RCTs) published from 2011 to 2016 across four obesity journals.MethodsAll issues from four leading obesity journals were searched systematically for RCTs from January 2011 to June 2016. Data on registration status were extracted from manuscripts, online trial registries, and a trial database; corresponding authors were contacted for registration details, when necessary. The methodological reporting of RCTs was assessed on specific criteria from the Consolidated Standards of Reporting Trials.ResultsA total of 223 RCTs were reviewed. Three‐quarters (n = 170) were registered publicly; 94 (55.3%) reported registration details in the manuscript, and 82 (48.2%) were registered prospectively. Newer RCTs were more likely to be registered prospectively than older RCTs (2014‐2016: 57.3% vs. 2011‐2013: 39.2%; c2 = 5.5, P = 0.02). Assessment on the Consolidated Standards of Reporting Trials demonstrated that less than half of all studies reported data collection dates (n = 108; 48.4%) or included “randomized trial” in the title (n = 89; 39.9%).ConclusionsThe methodological reporting of RCTs published in obesity journals is suboptimal, despite current guidelines and policies. To complement existing standards, editorial boards should incorporate mandatory fields within the online manuscript submission process to enhance the quality, transparency, and comprehensiveness of reporting RCTs in obesity journals.