bluuebunny/crossref_metadata_2025_split huggingface dataset:
Neural adaptive prescribed performance control for interconnected nonlinear systems with output dead zone
Authors: Du Peihao , Zhou Qi , Liang Hongjing 
Published: November 2019

SummaryThis paper is concerned with the neural‐based decentralized adaptive control for interconnected nonlinear systems with prescribed performance and unknown dead zone outputs. In the controller design procedure, neural networks are employed to identify unknown auxiliary functions, and the control design obstacle caused by the output nonlinearity is resolved via introducing Nussbaum function. Then, a reliable neural decentralized adaptive control is developed through incorporating the backstepping method and the prescribed performance technique. In the light of Lyapunov stability theory, it is verified that the proposed control scheme can ensure that all the closed‐loop signals are bounded, and can also guarantee that the tracking errors remain within a small enough compact set with the prescribed performance bounds. Finally, some simulation results are given to illustrate the feasibility of the devised control strategy.
Configurations of sustainable development goals that promote sustainable entrepreneurship over time
Authors: Moya‐Clemente Ismael , Ribes‐Giner Gabriela , Pantoja‐Díaz Odette 
Published: November 2019

AbstractThis paper examines sustainable entrepreneurship over time by focusing on the identification of the combinations of environmental factors (clean water and sanitation, affordable clean energy, urgent action to combat climate change, and life on land) and economic development factors (decent work and economic growth). Based on data from 50 countries, it examines the causal configurations behind the manifestations of these factors using fuzzy‐set qualitative comparison analysis. The variables and data were derived from the Global Entrepreneurship Monitor and the Sustainable Development Goals Index. Our key finding is that protecting and sustainably using terrestrial ecosystems always have a sufficiently positive effect to ensure a high level of sustainable entrepreneurship. Also, high levels of sustainable use of terrestrial ecosystems and sustainable growth and decent work, plus good access to affordable and sustainable energy and clean water are related to promote sustainable entrepreneurship.
Defects‐Induced In‐Plane Heterophase in Cobalt Oxide Nanosheets for Oxygen Evolution Reaction
Authors: Liu Zhijuan , Xiao Zhaohui , Luo Gan , Chen Ru , Dong Chung‐Li , Chen Xiaobo , Cen Jiajie , Yang Haotian , Wang Yanyong , Su Dong , Li Yafei , Wang Shuangyin 
Published: November 2019

AbstractCobalt oxides as efficient oxygen evolution reaction (OER) electrocatalysts have received much attention because of their rich reserves and cheap cost. There are two common cobalt oxides, Co3O4 (spinel phase, stable but poor intrinsic activity) and CoO (rocksalt phase, active but easily be oxidatized). Constructing Co3O4/CoO heterophase can inherit both characteristic features of each component and form a heterophase interface facilitating charge transfer, which is believed to be an effective strategy in designing excellent electrocatalysts. Herein, an atomic arrangement engineering strategy is applied to improve electrocatalytic activity of Co3O4 for the OER. With the presence of oxygen vacancies, cobalt atoms at tetrahedral sites in Co3O4 can more easily diffuse into interstitial octahedral sites to form CoO phase structure as revealed by periodic density functional theory computations. The Co3O4/CoO spinel/rocksalt heterophase can be in situ fabricated at the atomic scale in plane. The overpotential to reach 10 mA cm−2 of Co3O4/CoO is 1.532 V, which is 92 mV smaller than that of Co3O4. Theoretical calculations confirm that the excellent electrochemical activity is corresponding to a decline in average p‐state energy of adsorbed‐O on the Co3O4/CoO heterophase interface. The reaction Gibbs energy barrier has been significantly decreased with the construction of the heterophase interface.
Enzyme and AIEgens Modulated Solid‐State Nanochannels: In Situ and Noninvasive Monitoring of H2O2 Released from Living Cells
Authors: Lou Xiaoding , Song Yongjun , Liu Rui , Cheng Yong , Dai Jun , Chen Qing , Gao Pengcheng , Zhao Zujin , Xia Fan 
Published: November 2019

AbstractSolid‐state nanochannels have revealed great abilities in the sensing of ions, small biomolecules, and biological macromolecules. However, the current platform requires pretreatment of real samples to extract targets, which may induce false signals due to complicated collection and addition processes. Although nanopore electrodes or nanopipettes have been successfully utilized in the detection of intracellular redox‐active species without sample preparation processes, the insertion of nanoprobes to living cells is inevitable. Here, a strategy is reported to monitor H2O2 released from living cells based on functionalized solid‐state nanochannels without an insertion procedure. In this strategy, aggregation‐induced emission luminogens (AIEgens) with enzyme‐responsive linkage properties are combined in solid‐state nanochannels. When H2O2 released from cervical cancer cells (HeLa), Tyr‐containing AIEgens (TT) will form horseradish peroxidase‐modulated (HRP‐modulated) linkages in the nanochannels. The formation of linkages can result in the effective blockade of nanochannels, hence via transmembrane ionic current. Owing to the aggregation of linkage products, a fluorescence signal can be observed. By using these dual‐signal‐output nanochannels, in situ and noninvasive detection of H2O2 is able to be achieved. Together with molecular dynamic (MD) simulations results, solid surface zeta potential and contact angle experiments, it is concluded that the blockage of nanochannels is the dominate factor for ionic currents as well as fluorescence change.
Medical social network content analysis for medical image retrieval purpose
Authors: Gaith Ayadi Mouhamed , Bouslimi Riadh , Akaichi Jalel 
Published: November 2019

SummaryBackground and objective: Medical social networking platforms provide virtual spaces ensuring the interaction between different healthcare participants. As a part of the exchange, these spaces allow subscribers to upload medical images, describing different medical cases for an analysis or an interpretation proposal. Facing this expected huge amount of uploaded images generated daily, it is needed to engage new mechanisms to effectively deal with this circumstance, for enhancing the search function process of medical images, based on what is uploaded. To overcome this issue, setting up of images visual searching based on a content‐based medical image retrieval scheme is the solution. More clearly, such mechanism will help and motivate medical social networking subscribers to find visually similar stored images.Methods: To ensure this task, the development of this mechanism, technically, is based mainly on a fusion of three visual features, which offers a flexible and more precision. It is reinforced by a weighted distance approach through attributing weights for feature vectors to scale up the performance. Indeed, the displayed results of this system can be updated based on user's intention by a user interactive feedback mechanism to indicate the truly relevant images.Results: We provide the theoretical performance of our scheme. Extensive experiments were conducted on a categorically classified collection containing 500 images. We conduct a practical evaluation on this dataset classes, putting returned results in a comparative study with other models results, existing in the literature.Conclusions: The proposed scheme preserves the efficiency of the search task. As theoretically and experimentally established, our scheme offers an effective image retrieval model that can support different subscribers' expectations. The relevance feedback mechanism can keep the dynamism of the system, thus offering a continuous searching result evolution. Experimentation outcomes indicate better findings compared with the other models.
Fine tuning the circumscription ofFridericia(Bignonieae, Bignoniaceae)
Authors: Kaehler Miriam , Michelangeli Fabián A. , Lohmann Lúcia G. 
Published: November 2019

AbstractThe plant family Bignoniaceae has a complicated history of supra‐specific level systematics. In the past decade, molecular phylogenetic studies have contributed substantially to an improved circumscription of clades at all taxonomic levels, especially at the generic and tribal levels. For instance, a molecular phylogeny of the tribe Bignonieae reconstructed a polyphyleticArrabidaea, and proposed a new circumscription for members of the Arrabidaea & Allies clade. Within this new classification, most species previously included inArrabidaeawere distributed among four genera:Cuspidaria(19 spp.),Fridericia(67 spp.),Tanaecium(17 spp.), andXylophragma(7 spp.). The taxonomy ofFridericia, the genus that received most species ofArrabidaea, remains complicated due to the high morphological variability and broad distribution of its species. Here, we used molecular data and a broad sampling of taxa within the Arrabidaea & Allies clade to reconstruct the phylogeny ofFridericia. We then studied the morphology of all species ofFridericiaand identified morphological synapomorphies that characterize major clades that represent meaningful units for future taxonomic studies. Most genera included in the Arrabidaea & Allies clade were retrieved as monophyletic; however, two species ofFridericiawere reconstructed withinCuspidaria, while three species ofFridericiawere placed withinTanaecium. The molecular phylogenetic placements received additional support from morphology, and the necessary taxonomic changes are proposed. We combine three species ofFridericiaintoTanaecium(T. dichotomumcomb. nov.,T. paradoxumcomb. nov.,T. parviflorumcomb. nov.), two species intoXylophragma(X. clausseniicomb. nov.,X. corchoroidescomb. nov.), two species intoCuspidaria(C. bracteolatacomb. nov.,C. monophyllacomb. nov.), and one species ofAdenocalymmaintoFridericia(F. trichocladacomb. nov.). We also synonymizeFridericia whiteiintoCuspidaria pulchra. We present a key for the seven main clades identified within the genus, as well as a detailed morphological description forFridericiaand its major lineages.
Evaluating the efficacy of using sentence frames for learning new vocabulary in science
Authors: Block Nicholas C. 
Published: November 2019

AbstractScience students are increasingly challenged to use technical language related to the topics that they are studying, and therefore, science teachers benefit from knowing which tools are effective to support students in learning to use new terms. This study examined the impact of using one such tool—sentences frames—to teach science vocabulary, as measured through a science‐writing task. Using an experimental approach with extant middle school science classes that offered a sample of 75 mainly Latino school students from grades six through eight, the researcher together with participating teachers identified 10 essential terms per science unit. The teachers used vocabulary‐focused sentence frames for teaching the terms in one science unit, and a more traditional science text‐based approach for teaching vocabulary in another unit. The writing task required at the end of the units consisted of essays in response to science‐based prompts that directed students to use as many target science words as possible; matching/cloze format quizzes were also used to measure pretest and posttest receptive vocabulary knowledge. Findings indicated that there were advantages for teaching new science vocabulary via sentence frames as measured by use of the words in writing, but there were no advantages for sentence frames on quizzes measuring receptive vocabulary. Advantages of sentence frames for writing approached but did not reach statistical significance. There was some evidence that current and previous English language learners benefited more than initial English speakers from sentence frames, implying that utilizing sentence frames to teach science vocabulary might offer needed support especially for these subgroups. Limitations of the study included the sample size and the possibility that the strategy utilized in the comparison group might have offered some of the same advantages in producing language with technical vocabulary that the sentence frames unit offered.
Aggregation kinetics and mechanisms of silver nanoparticles in simulated pollution water under UV light irradiation
Authors: Zhang Zhi‐Guo , Wu Qi‐Tang , Shang Enxiang , Wang Xinjie , Wang Kaixuan , Zhao Jian , Duan Jiajun , Liu Yuan , Li Yang 
Published: November 2019

AbstractThis paper investigated the effect mechanism of complex components (fulvic acid [FA], sodium dodecylbenzene sulfonate [SDBS], and sodium nitrate [NaNO3]) on the aggregation kinetics of polyvinylpyrrolidone‐modified silver nanoparticles (PVP‐AgNPs) under UV irradiation. The results showed that FA and NaNO3 alone did not cause aggregation due to the high steric hindrance and/or electrostatic repulsive forces. In high concentration of SDBS solution (20–50 mM), the stability of PVP‐AgNPs was reduced by adsorbing SDBS on nanoparticle surface and replacing their PVP coatings. A mixed system of two pollutants had a synergistic effect on PVP‐AgNPs aggregation. In the mixed system of SDBS and FA, the interaction of SDBS and PVP‐AgNPs dominated the aggregation of PVP‐AgNPs. NaNO3 significantly improved the aggregation rate of PVP‐AgNPs in SDBS solution due to the charge neutralization effect of electrolyte. In 20 mg/L FA solution, the aggregation rate increased slightly with increasing NaNO3 concentration from 50 to 200 mM due to the charge neutralization effect, while the hydrodynamic diameters of PVP‐AgNPs increased linearly and rapidly to micrometer size because the spatial conformation of adsorbed FA became compact in high‐salinity solution. The calculation results of eDLVO theory were basically consistent with most of the experimental results.Practitioner points

PVP‐AgNPs was uniformly dispersed in NaNO3 or FA solution under UV irradiation.

PVP‐AgNPs formed aggregates in SDBS solutions under UV irradiation.

A system with two mixed pollutants had a synergistic effect on promoting aggregation of PVP‐AgNPs.

eDLVO theory could explain the aggregation results in different chemical conditions except in NaNO3 solution.
Superstring amplitudes, unitarily, and Hankel determinants of multiple zeta values
Authors: Green Michael B. , Wen Congkao 
Published: November 2019

Abstract
The interplay of unitarity and analyticity has long been known to impose strong constraints on scattering amplitudes in quantum field theory and string theory. This has been highlighted in recent times in a number of papers and lecture notes. Here we examine such conditions in the context of superstring tree-level scattering amplitudes, leading to positivity constraints on determinants of Hankel matrices involving polynomials of multiple zeta values. These generalise certain constraints on polynomials of single zeta values in the mathematics literature.
Sensitivity analysis of free torsional vibration frequencies of thin-walled laminated beams under axial load
Authors: Szymczak Czesław , Kujawa Marcin 
Published: November 2019

AbstractThe paper addresses sensitivity analysis of free torsional vibration frequencies of thin-walled beams of bisymmetric open cross section made of unidirectional fibre-reinforced laminate. The warping effect and the axial end load are taken into account. The consideration is based upon the classical theory of thin-walled beams of non-deformable cross section. The first-order sensitivity variation of the frequencies is derived with respect to the design variable variations. The beam cross-sectional dimensions and the material properties are assumed the design variables undergoing variations. The paper includes a numerical example related to simply supported I-beams and the distributions of sensitivity functions of frequencies along the beam axis. Accuracy is discussed of the first-order sensitivity analysis in the assessment of frequency changes due to the fibre volume fraction variable variations, and the effect of axial loads is discussed too.
The Use of Serratus Anterior Fascial Flap in Integrated Mastectomy and Implant Reconstruction
Authors: Chan Yolanda Ho‐Yan , Yue Ivan Kai‐Hong , Ho Chiu‐Ming , Cheung Polly Suk‐Yee 
Published: November 2019

AbstractBackgroundTissue reinforcement with acellular dermal matrix (ADM) in implant‐based breast reconstruction contributes to the coverage of the implant and avoids its direct exposure to skin incision, yet not without risk of infection. Our integrated technique makes use of the in situ serratus anterior fascia as a support of the implant following mastectomy, which serves the same purpose of ADM in terms of aesthetic outcomes, but minimizes the hazard of infective complications.MethodsWe retrospectively reviewed all the nipple‐sparing mastectomies with direct‐to‐implant immediate reconstruction in Hong Kong Sanatorium and Hospital from 2012 to 2016. The authors made use of the serratus anterior fascial flap as inferolateral coverage for the subpectoral implant. Consequently, the implant would be completely covered by autologous tissues.ResultsAmong the 51 women included, primary breast cancers account for 91.8% of our indications for these 61 procedures of integrated mastectomy and implant reconstruction. The remaining five (8.2%) were performed as contralateral prophylactic mastectomy. Almost three quarters of the patients had a bra cup size of B or below. After a mean follow‐up of 28.9 months, there was no reported post‐operative complication of skin flap or nipple–areolar complex necrosis, or infection or extrusion of the implant.ConclusionsOur series support that the serratus anterior fascial flap could provide autologous coverage in integrated mastectomy and implant breast reconstruction, especially in small‐ and medium‐sized breasts. Appropriate patient selection, as well as meticulous surgical technique, is critical for its success.
Butyric acid, a gut bacteria metabolite, lowers arterial blood pressure via colon-vagus nerve signaling and GPR41/43 receptors
Authors: Onyszkiewicz Maksymilian , Gawrys-Kopczynska Marta , Konopelski Piotr , Aleksandrowicz Marta , Sawicka Aneta , Koźniewska Ewa , Samborowska Emilia , Ufnal Marcin 
Published: November 2019

AbstractButyric acid (BA) is a short-chain fatty acid (SCFA) produced by gut bacteria in the colon. We hypothesized that colon-derived BA may affect hemodynamics. Arterial blood pressure (BP) and heart rate (HR) were recorded in anesthetized, male, 14-week-old Wistar rats. A vehicle, BA, or 3-hydroxybutyrate, an antagonist of SCFA receptors GPR41/43 (ANT) were administered intravenously (IV) or into the colon (IC). Reactivity of mesenteric (MA) and gracilis muscle (GMA) arteries was tested ex vivo. The concentration of BA in stools, urine, portal, and systemic blood was measured with liquid chromatography coupled with mass spectrometry. BA administered IV decreased BP with no significant effect on HR. The ANT reduced, whereas L-NAME, a nitric oxide synthase inhibitor, did not affect the hypotensive effect of BA. In comparison to BA administered intravenously, BA administered into the colon produced a significantly longer decrease in BP and a decrease in HR, which was associated with a 2–3-fold increase in BA colon content. Subphrenic vagotomy and IC pretreatment with the ANT significantly reduced the hypotensive effect. Ex vivo, BA dilated MA and GMA. In conclusion, an increase in the concentration of BA in the colon produces a significant hypotensive effect which depends on the afferent colonic vagus nerve signaling and GPR41/43 receptors. BA seems to be one of mediators between gut microbiota and the circulatory system.
Progress against inequalities in mortality: register-based study of 15 European countries between 1990 and 2015
Authors: Mackenbach Johan P. , Rubio Valverde José , Bopp Matthias , Brønnum-Hansen Henrik , Costa Giuseppe , Deboosere Patrick , Kalediene Ramune , Kovács Katalin , Leinsalu Mall , Martikainen Pekka , Menvielle Gwenn , Rodriguez-Sanz Maica , Nusselder Wilma J. 
Published: November 2019

AbstractSocioeconomic inequalities in mortality are a challenge for public health around the world, but appear to be resistant to policy-making. We aimed to identify European countries which have been more successful than others in narrowing inequalities in mortality, and the factors associated with narrowing inequalities. We collected and harmonised mortality data by educational level in 15 European countries over the last 25 years, and quantified changes in inequalities in mortality using a range of measures capturing different perspectives on inequality (e.g., ‘relative’ and ‘absolute’ inequalities, inequalities in ‘attainment’ and ‘shortfall’). We determined which causes of death contributed to narrowing of inequalities, and conducted country- and period-fixed effects analyses to assess which country-level factors were associated with narrowing of inequalities in mortality. Mortality among the low educated has declined rapidly in all European countries, and a narrowing of absolute, but not relative inequalities was seen in many countries. Best performers were Austria, Italy (Turin) and Switzerland among men, and Spain (Barcelona), England and Wales, and Austria among women. Ischemic heart disease, smoking-related causes (men) and amenable causes often contributed to narrowing inequalities. Trends in income inequality, level of democracy and smoking were associated with widening inequalities, but rising health care expenditure was associated with narrowing inequalities. Trends in inequalities in mortality have not been as unfavourable as often claimed. Our results suggest that health care expansion has counteracted the inequalities widening effect of other influences.
Resilience of planktonic bacterial community structure in response to short-term weather deterioration during the growing season in an alpine lake
Authors: Ma Tianli , Jiang Yiming , Elbehery Ali H. A. , Blank Stephan , Kurmayer Rainer , Deng Li 
Published: November 2019

AbstractThe disturbing effect of a short-term cooling period during summer on planktonic bacterial community structure of an alpine lake was investigated using 16S rDNA pyrosequencing. Proteobacteria, Actinobacteria, and Bacteroidetes constituted the most abundant phyla. During the sampling period (from July to August 2010), a sudden cooling period with high precipitation occurred, as indicated by a decrease in conductivity, calcium, and dissolved organic carbon concentration resulting from increased runoff. The relative abundance of Actinobacteria, Betaproteobacteria, and Cyanobacteria decreased during this short-term cooling period. Instead, a rapid shift from Betaproteobacteria to Gammaproteobacteria occurred, which was mainly caused by an increase of Acinetobacter rhizosphaerae. Soon after the short-term cooling period, warmer weather conditions got re-established and Betaproteobacteria recovered and became again dominant. Non-metric multi-dimensional scaling analysis and Venn diagrams revealed a planktonic bacterial community composition with high similarity at the beginning and the end of the growing season. Air temperature and precipitation were significantly correlated with the observed variation in operational taxonomic unit (OTU) relative abundance. It is concluded that, in response to the short-term cooling period, a distinct planktonic bacterial OTU community developed. It rapidly diminished, however, as summer conditions became re-established, implying the recovery of the original bacterial community structure.