bluuebunny/crossref_metadata_2025_split huggingface dataset:
Simultaneous transverse oscillations of a coronal loop and a filament excited by a circular-ribbon flare
Authors: Zhang Q. M. 
Published: August 2020

Aims. The aim of this study is to investigate the excitation of kink oscillations in coronal loops and filaments, by analyzing a C3.4 circular-ribbon flare associated with a blowout jet in active region 12434 on 2015 October 16.
Methods. The flare was observed in ultraviolet and extreme-ultraviolet wavelengths by the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory (SDO) spacecraft. The line-of-sight (LOS) magnetograms of the photosphere were observed by the Helioseismic and Magnetic Imager on board SDO. Soft X-ray fluxes of the flares in 0.5−4 and 1−8 Å were recorded by the GOES spacecraft.
Results. The flare excited small-amplitude kink oscillation of a remote coronal loop. The oscillation lasted for ≥4 cycles without significant damping. The amplitude and period are 0.3 ± 0.1 Mm and 207 ± 12 s. Interestingly, the flare also excited transverse oscillation of a remote filament. The oscillation lasted for ∼3.5 cycles with decaying amplitudes. The initial amplitude is 1.7−2.2 Mm. The period and damping time are 437−475 s and 1142−1600 s. The starting times of simultaneous oscillations of coronal loop and filament were concurrent with the hard X-ray peak time. Though small in size and short in lifetime, the flare set off a chain reaction. It generated a bright secondary flare ribbon (SFR) in the chromosphere, remote brightening (RB) that was cospatial with the filament, and intermittent, jet-like flow propagating in the northeast direction.
Conclusions. The loop oscillation is most probably excited by the flare-induced blast wave at a speed of ≥1300 km s−1. The excitation of the filament oscillation is more complicated. The blast wave triggers secondary magnetic reconnection far from the main flare, which not only heats the local plasma to higher temperatures (SFR and RB), but produces jet-like flow (i.e., reconnection outflow) as well. The filament is disturbed by the secondary magnetic reconnection and experiences transverse oscillation. These findings provide new insight into the excitation of transverse oscillations of coronal loops and filaments.
Sunspot penumbral filaments intruding into a light bridge and the resultant reconnection jets
Authors: Hou Y. J. , Li T. , Zhong S. H. , Yang S. H. , Guo Y. L. , Li X. H. , Zhang J. , Xiang Y. Y. 
Published: August 2020

Context. Penumbral filaments and light bridges are prominent structures inside sunspots and are important for understanding the nature of sunspot magnetic fields and magneto-convection underneath.
Aims. We investigate an interesting event where several penumbral filaments intrude into a sunspot light bridge. In doing so we aim to gain further insight into the magnetic fields of the sunspot penumbral filament and light bridge, as well as their interaction.
Methods. Combining data from the New Vacuum Solar Telescope, Solar Dynamics Observatory, and Interface Region Imaging Spectrograph, we study the emission, kinematic, and magnetic topology characteristics of the penumbral filaments intruding into the light bridge and the resultant jets.
Results. At the west part of the light bridge, the intruding penumbral filaments penetrate into the umbrae on both sides of the light bridge, and two groups of jets are also detected. The jets share the same projected morphology with the intruding filaments and are accompanied by intermittent footpoint brightenings. Simultaneous spectral imaging observations provide convincing evidence for the presences of magnetic-reconnection-related heating and bidirectional flows near the jet bases and contribute to measuring the vector velocities of the jets. Additionally, nonlinear force-free field extrapolation results reveal strong and highly inclined magnetic fields along the intruding penumbral filaments, highly consistent with the results deduced from the vector velocities of the jets. Therefore, we propose that the jets could be caused by magnetic reconnections between emerging fields within the light bridge and the nearly horizontal fields of intruding filaments. The jets are then ejected outward along the stronger filament fields.
Conclusions. Our study indicates that magnetic reconnection could occur between the penumbral filament fields and emerging fields within the light bridge and produce jets along the stronger filament fields. These results further complement the study of magnetic reconnection and dynamic activities within the sunspot.
PIP2: A critical regulator of vascular ion channels hiding in plain sight
Authors: Harraz Osama F. , Hill-Eubanks David , Nelson Mark T. 
Published: August 2020

SignificancePhosphatidylinositol 4,5-bisphosphate (PIP2), a plasma membrane lipid, is hydrolyzed by Gq-protein–coupled receptor (GqPCR) signaling into inositol 1,4,5-trisphosphate and diacylglycerol—extensively studied second messengers with profound regulatory effects in the vasculature. However, there is extensive evidence that PIP2directly regulates ion channels, a finding with significant implications for vascular function. Beyond providing a previously unexplored perspective on how vascular GqPCR signaling influences vascular function, the concept of PIP2-mediated ion channel regulation helps to explain how vascular cell excitability is coordinated to support cerebral blood flow control mechanisms. Importantly, the link between the metabolic state of vascular cells and PIP2content may provide insight into how metabolism affects vascular ion channel activity and, ultimately, vascular function in health and disease.
Inhibition of PIKfyve kinase prevents infection by Zaire ebolavirus and SARS-CoV-2
Authors: Kang Yuan-Lin , Chou Yi-ying , Rothlauf Paul W. , Liu Zhuoming , Soh Timothy K. , Cureton David , Case James Brett , Chen Rita E. , Diamond Michael S. , Whelan Sean P. J. , Kirchhausen Tom 
Published: August 2020

Significance
The membrane fusion proteins of viral pathogens as diverse in their replication strategies as coronaviruses and filoviruses depend, for their functional activity, on proteolytic processing during cell entry. Endosomal cathepsins carry out the cleavages. We have constructed chimeric forms of vesicular stomatitis virus (VSV) bearing the fusion proteins of Zaire ebolavirus (ZEBOV) or SARS coronavirus 2 (SARS-CoV-2) and shown that two small-molecule inhibitors of an endosomal lipid kinase (PIKfyve) inhibit viral infection by preventing release of the viral contents from endosomes. Both inhibitory compounds cause distension of Rab5 and Rab7 subcompartments into small vacuoles. One of them (Apilimod) also inhibits infection of cells by authentic SARS-CoV-2. The results point to possibilities for host targets of antiviral drugs.
Poly-procedural meaning and rhetoric
Authors: Bardzokas Valandis 
Published: August 2020

AbstractThe current paper aims to explore the meaning of one of the most elusive discourse markers in Modern Greek rhetorical discourse:afu. To address the challenge of a thorough and parsimonious account, the relevance-theoretic model of meaning analysis is deployed. The analysis undertaken ultimately reveals that the marker at hand encodes procedural meaning in standard relevance-theoretic terms. However, unlike traditional relevance-theoretic approaches linking a marker to a single procedural function, the current one proposes thatafuencodes a poly-procedural constraint on the implicated content of the utterance containing the marker. Moreover, it is argued that this poly-procedural constraint is rhetorically exploited by the speaker in the interest of convincing argumentation.
Identity studies and identity construction
Authors: Chen Rong 
Published: August 2020

AbstractIn this paper, I report on a quasi-case study of U.S. presidential identity based on Donald J. Trump’s presidency, demonstrating that Trump is considered by the American public as an antithesis of presidentiality. I then discuss the insights from this study on several critical issues that face identity studies, an expansive area of investigation which has attracted the attention of students from a diverse range of disciplines. I demonstrate that identity is a set of attributes the formation of which is based on the mission of the group and the expected behaviors of members of that group, that the construction of identity is largely a bottom-up and gradual process, and that identity is both preexisting and emergent.
Constituency and coincidence in Chácobo (Pano)
Authors: Tallman Adam J. R. 
Published: August 2020

AbstractThis paper provides a detailed description of the results of 24 constituency diagnostics, both morphosyntactic and phonological, to Chácobo, a southern Pano language of the northern Bolivian Amazon. While it is often assumed that misalignments across the domains that emerge from constituency diagnostics can be resolved by reference to a distinction between phonological and morphosyntactic words, I argue that this is not true of Chácobo. Divergence is at least as high within phonological domains and morphosyntactic domains as it is across them. While it is often assumed that domains tend to converge overall on a single wordhood candidate or that domain divergence is marginal, I argue that this is not true of Chácobo. I present a cluster of methodologies that assess the motivation for a word constituent as an empirical hypothesis, rather than treating it as an a priori assumption. No strong evidence for a word constituent emerges from the Chácobo data. Theoretical and methodological implications are discussed.
A fragile shield for protecting civil rights: The European Union in the eyes of Italian feminists
Authors: Chironi Daniela 
Published: August 2020

ABSTRACT
The article explores how feminist and LGBTQI organisations frame the European Union (EU), the claims they address to the EU institutions, and the actions they put in place at the continental level. Challenging previous beliefs of a linear increase in the Europeanisation of progressive social movements, this study reveals a more complex picture. Heavily affected by the economic and political crises, Italian women and LGBTQI activists share the radical criticism of EU austerity policies put forward by labour and youth movements. Nonetheless, they reject any option for breaking down the EU, as they conceive of it as a source of multilevel opportunities and a field for struggles from below, in which mechanisms of cross-national horizontal diffusion have facilitated the return of mass protest. While chances to realise the ‘other Europe’ project are perceived as low, activists hope that the EU is a potential ally against domestic conservatism.
Multigap superconductivity in the Mo5PB2 boron–phosphorus compound
Authors: Shang T , Xie W , Gawryluk D J , Khasanov R , Zhao J Z , Medarde M , Shi M , Yuan H Q , Pomjakushina E , Shiroka T 
Published: August 2020

Abstract
The tetragonal Mo5PB2 compound was recently reported to show superconductivity with a critical temperature up to 9.2 K. In search of evidence for multiple superconducting gaps in Mo5PB2, comprehensive measurements, including magnetic susceptibility, electrical resistivity, heat capacity, and muon-spin rotation and relaxation measurements were carried out. Data from both low-temperature superfluid density and electronic specific heat suggest a nodeless superconducting ground state in Mo5PB2. Two superconducting energy gaps Δ0 = 1.02 meV (25%) and 1.49 meV (75%) are required to describe the low-T electronic specific-heat data. The multigap features are clearly evidenced by the field dependence of the electronic specific-heat coefficient and the Gaussian relaxation rate in the superconducting state (i.e., superfluid density), as well as by the temperature dependence of the upper critical field. By combining our extensive experimental results with numerical band-structure calculations, we provide compelling evidence of multigap superconductivity in Mo5PB2.
Geological and physical-chemistry characterization of asphaltite from Colombian Middle Magdalena region
Authors: Bustos N , Jerez E , Paez L , Roa M 
Published: August 2020

Abstract
The massive consumption of fossil hydrocarbons and the absence of new conventional oil reserves, research on unconventional resources is prevalent. The Asphaltite is a substance with high energy value thanks to its composition of high molecular weight hydrocarbons, becomes an energy alternative in the future. In Middle Magdalena region of Colombia, Luna formation emerges with its members Salada, Pujamana, and Galembo of Upper Cretaceous age, which contains a deposit of this type of substances, which can become an economic and energy engine for the region. A representative sample of this asphaltite was taken in the Galembo Member (Top of Luna formation) and a geological description was made about its formation and occurrence in the area. The solubility of asphaltite was evaluated in two characteristic solvents for hydrocarbons, toluene and heptane, the first of aromatic character, with which it was possible to solubilize probably corresponding to the light fractions, while solubilization with heptane generated a precipitate Asphaltene, a nature that was corroborated by tests of visible infrared and ultraviolet spectroscopy, additionally an elementary analysis was performed to determine the concentrations of carbon, hydrogen, sulphur and oxygen. Finally, by means of thermogravimetry and differential scanning calorimetry an analysis was carried out to evaluate its energy potential, according to the results obtained, asphaltite samples are a promising energy resource.
Evaluation of a hyperbranched polyester polyol as plasticizing agent for composites of recycled polystyrene and rice husk
Authors: Sandoval N A , Cruz A P , Murillo E A 
Published: August 2020

AbstractThis study makes a contribution to the preparation of composites from recycled polystyrene and rice husk (it is mainly incinerated producing environmental contamination in Norte de Santander department-Colombia), which will contribute to reduce the accumulation of waste derivatives from polymeric and rice industries in this region. Hence, the aim of this work was to use a hyperbranched polyester as plasticizing agent and to evaluate its influence on the properties of the composites. The proportions of the recycled polystyrene and rice husk were 60 wt% and 40 wt% respectively. In the case of the polyester, were employed amount of 10 wt%, 20 wt%, 30 wt% and 40 wt%. Also was prepared a control sample (0 % of polyester). The results of infrared analysis evidenced changes in the absorption of the hydroxy groups. The thermogravimetric analysis showed that the first thermal decomposition of the composites decreased with the polyester content, but it did not follow the same trend on mechanical properties. The results of scanning electronic microscopy analysis allowed evidence that the fracture mechanism of the composite was fragile. The viscosity of the control sample was lower than that of the composites obtained with the polyester.
Applications of the Poisson and diffusion equations to materials science
Authors: Nolasco C , Jácome N J , Hurtado-Lugo N A 
Published: August 2020

Abstract
The scope of a variety of experiments involving the transfer of heat in engineering applications is evident in research on thermal studies throughout the department of Norte de Santander, Colombia. From the energy optimization processes in the brickworks of the province of Ocaña to the didactic use in the Universidad Francisco Santander, Ocaña, Colombia. In this sense, mathematical models will be a fundamental tool in the understanding of thermal transfer processes. The aim of this work is to establish a mathematical model by numerical methods to determine the physical process of heat transfer in liquid crystal. For the data acquisition, an experiment that measures thermal properties on an aluminum plate was designed. We proceed to propose a mathematical model that uses the Poisson equation. Also, we proceed to calculate the solution of the equation by the finite difference method and then make a comparison with the analytical solution and the experimental data.
A computational model of a natural language processing system for architectural technical debt management
Authors: Perez B , Castellanos C , Correal D 
Published: August 2020

Abstract
Technical debt is a concept applied to decisions taken to favor rapid production, at the expense of future capacities to evolve or improve the product or service. This concept is transversal to all sciences, especially in experimental physics and systems. However, technical debt is difficult to manage because there is a lack of time, expertise, or knowledge on how to perform it. This paper proposes a computational model of technical debt management in software architecture, based on observations made in software teams in their daily work. This computational model exploits natural language processing and model-testing techniques on software project artifacts to build a model that allows localizing and visualizing the impact produced by the technical debt and its payment strategies. This proposal aims to support teams of architects to explain the current and future impact of the debt injected as a result of decisions made.
Developing a theory based on the causes of technical debt injection into software projects in Colombia
Authors: Perez B , Castellanos C , Correal D 
Published: August 2020

Abstract
Engineering, like sciences such as physics, seeks to ensure that the conclusions reached can be verified through experiments, and that subsequent theories allow predictions to be made in future observations. This procedure is applied in this article, whose objective is the identification of the causes that favor the injection or presence of technical debt, and its application in software projects in Colombia, to build a theory that allows explaining this behavior. In turn, these causes could be also extrapolated to physical research projects. Results showed that “focus on producing more at the expense of quality” is the most cited cause in general. Conversely, “planning and management” is the most cited category of causes of technical debt. The concept of technical debt is well understood by software practitioners and that most efforts need to be invested by researchers on offering strategies and tools to support technical debt management.
Analysis of caffeine in energy drinks by ultra-fast liquid chromatography
Authors: Medina I Y , Rodríguez D C , Parra J W 
Published: August 2020

Abstract
The objective of this work was to standardize the method of analysis of caffeine and determine its content in three energy drinks (Vive 100, Peak and Red Bull) consumed in the Colombian market, which were selected based on the results of a significant survey conducted to 384 people in the metropolitan area of “San José de Cúcuta, Colombia”, from each energy drink two production lots were taken and in turn from each lot three drinks were taken for a total of 18, each one was analyzed in triplicate; caffeine concentration was determined on a Shimadzu Prominence ultra-fast liquid chromatograph. The average concentrations in mg of caffeine/L, for lot 1 were 256.96, 218.10 and 235.73 for drinks Vive 100, Peak and Red Bull, respectively and for lot 2, the respective values were 229.30, 233.86 and 238.33. As established in Resolution 4150 of 2009, the maximum limit allowed is 320 mg of caffeine/L, it was observed that the concentrations in all the energy drinks analyzed are lower, therefore, they are complying with the provisions of the law.
Evaluation of the influence of calcium carbonate on the firing process and sintering time
Authors: Guerrero-Gómez G , Afanador-García N , Noriega-Sánchez C J 
Published: August 2020

Abstract
This paper presents the use of calcium carbonate as an additive in the manufacturing process of ceramic bricks, in order to reduce the temperature and sintering time of the clays and to improve the quality of the products. In the study, samples of solid bricks with two different proportions were made. One was composed of 100% clay and the other of 70% clay and 30% calcium carbonate, which were fired in an intermittent kiln. The temperatures of the firing process were recorded using a virtual instrument. The samples manufactured were tested for water absorption and strength. The addition of calcium carbonate brought advantages such as an 8.66% decrease in fuel consumption, a 23.88% decrease in firing time, a 12.11% and 26.67% decrease in the firing temperature and gases released into the environment, respectively, as well as improvements in the quality of the product. The use of calcium carbonate as an additive decreased the time and temperature of ceramic firing and fuel consumption and increased energy efficiency, productivity and product quality, as well as reduced gas emissions into the environment.
Genetic Algorithm 3D Trajectory Planning Based on Digital Map Pre-processing for Tilt-rotor Aircraft
Authors: Gao Jiaxin , Zhang Qian , Yu Zelong 
Published: August 2020

Abstract
Tilt-rotor aircraft is a new type of aircraft which can take off and land vertically and cruise at high speed. It can be used to perform specific tasks by special departments such as public security or fire rescue. The terrain environment and threat of tasks are complex and changeable. In order to ensure flight safety, the flight trajectory should be planned in advance. As a global optimization algorithm simulating biological evolution process, genetic algorithm is mostly used in two-dimensional flight path planning. In this paper, the three-dimensional digital map is preprocessed according to the actual mission environment and constraints of the tiltrotor aircraft. The related genetic operators and individual evaluation function of the genetic algorithm are improved to reduce the calculation of the trajectory planning and effectively avoid the partial optimal solution. The simulation results show that after preprocessing the 3D digital map, a 3D mission trajectory with the best cost in the complex mission environment can be successfully planned by the improved genetic algorithm.
Experimental and Simulation Study on the Pool Fire of Low Pressure Atomizing Nozzle
Authors: Chen Jian , Fan Enxi 
Published: August 2020

Abstract
Bubble atomization technology, originated in the 1990s, has the advantages of simple structure, good atomization effect, low influence of liquid viscosity on atomization effect and low energy consumption. At present, it is widely used in the fields of combustion, spraying and fire fighting. In order to further expand the application field of bubble atomization, the possibility of applying bubble atomization to cooling and cooling is studied in this paper. In this paper, six types of bubble atomization nozzles with different structures are designed and a special experimental platform is built to measure the data of six types of nozzle. The flow characteristics, droplet size distribution, droplet velocity distribution and other parameters of six kinds of bubble atomizing nozzles were studied, and the experimental results were compared and analyzed. On this basis, Fluent simulation software was used in this paper to simulate the gas-liquid two-phase distribution, velocity distribution and spray velocity distribution at the nozzle outlet of the mixing chamber structure, so as to supplement and verify the experimental results. Different nozzle structures have great influence on the atomization effect of the bubble atomization nozzle. This conclusion will play a certain role in the design of the bubble atomization nozzle in the future.