bluuebunny/crossref_metadata_2025_split huggingface dataset:
A folded monopole antenna with variable input impedance by connecting additional elements
Authors: Nakagawa Yuta , Mizutani Tomokazu , Michishita Naobumi , Morishita Hisashi 
Published: March 2021

AbstractA folded monopole antenna (FMA) with two different input impedances were investigated to develop an antenna that is robust to metal for applications in a space enclosed by metal objects. An antenna with a variable input impedance is required for improving its robustness to the metal. An FMA with a novel structure is proposed to control the input impedance using a simple configuration. The structure comprises six additional elements parallel to the FMA. However, the number is not limited to six. Some additional elements are electrically connected or disconnected depending on the requirement. Method of moment (MoM) and characteristics mode analysis (CMA) are used in the simulation. The MoM results demonstrate that the input impedance can be adjusted in a step‐wise manner based on the number of additional elements connected to the FMA. This result is similar to that of the input impedance of an FMA with different strip widths considering impedance step‐up ratios (SURs). Furthermore, the change in the antenna characteristics owing to the non‐connected additional elements is minimal. The CMA results reveal that the proposed antenna has the same operation mode as the FMA with different strip widths considering impedance SURs.
PH‐RLS: A parallel hybrid recursive least square algorithm for self‐mixing interferometric laser sensor
Authors: Khan Zohaib A , Hussain Tassadaq , Zabit Usman , Usman Muhammad , Ayguade Eduard 
Published: March 2021

AbstractThe authors present the parallel‐hybrid recursive least square (PH‐RLS) algorithm for an accurate self‐mixing interferometric laser vibration sensor coupled with an accelerometer under industrial conditions. Previously, this was achieved by using a conventional RLS algorithm to cancel the parasitic vibrations where the sensor itself is not in the stationary environment. This algorithm operates in sequential mode and due to its compute and data‐intensive nature, the algorithm does not work for real‐time applications, hence requires parallel computing. Therefore, the existing conventional RLS C program is parallelized by using hybrid OpenACe C/MPI (Open Accelerators/Message Passing Interface) parallel programming models and tested on Barcelona Supercomputing Center CTE‐Power9 Supercomputer. The computational performance of the proposed PH‐RLS algorithm is compared with the existing conventional RLS code by executing on multi distributed processors and uni‐core processor architecture, respectively. While comparing the performance of conventional RLS with a PH‐RLS algorithm on eight nodes of CTE‐Power9 supercomputer, the results show that the PH‐RLS algorithm gets 5857 times of performance improvement as compared to the conventional RLS implementation on a single node system. The results show that the proposed PH‐RLS also gives a scalable performance for a different range of vibration signals, making it a suitable choice for real‐time self‐mixing interferometer sensing systems working under industrial conditions.
Contact‐free dielectric response measurement based on limit fitting by neural network
Authors: Shen Zhongyi , Yang Lijun , Tang Hanwei , Lai Yijun 
Published: March 2021

AbstractFrequency domain spectroscopy (FDS) is widely used in analysis of insulation condition of dielectric material. The traditional contact method is susceptible to the impact of the contact state between the test sample and the electrode, which is also difficult to ensure the accuracy and repeatability of the test results. Using the method of sputtering gold on the surface of the sample is an effective way to avoid this problem though, this processing method is time‐consuming and high‐cost. This paper presents a method based on limit fitting by neural network to realize contact‐free dielectric response measurement, which can eliminate the distortion effect of the air gap introduced by the uneven surface of dielectric material. Cross linked polyethylene (XLPE) is chosen as the test object to verify this method: in the domain of frequency = 1–1000 Hz, comparing with the test results of sample treatment by gold sputtering, the average error of frequency domain spectroscopy data in traditional method is 10%, while the new method is only 1%. Meanwhile, this paper analyses the cause of the errors in each method.
Optimal peer‐to‐peer energy sharing between grid‐connected prosumers with different demand profiles and renewable energy sources
Authors: Kusakana Kanzumba 
Published: March 2021

AbstractA model is developed to optimise power sharing between two grid‐connected prosumers that incorporates photovoltaic and wind energy conversion systems operating in a peer‐to‐peer (P2P) energy‐sharing arrangement. The city of Durban, South Africa, where wind and solar resources are abundant, is selected as a case study to analyse power flows between selected prosumers. The model optimally manages power flows among micro renewables‐based energy generators while minimising the total cost of energy purchased from the power utility under a time‐variable pricing structure. To evaluate the economic feasibility of the suggested peer‐to‐peer energy‐sharing arrangement, a lifecycle cost analysis is conducted to determine when the proposed system will break even, in terms of money spent less achievable salvage value, using the suggested prosumers instead of providing power exclusively from the grid to satisfy load demands. The analysis predicts that the breakeven point will occur after 4.3 years at $13,500, with a projected saving at the end of the 20‐year lifecycle of approximately $60,536.82, or 47.42%. Furthermore, the ‘true’ payback period method is used to assess the economic behaviour of the proposed system with P2P energy‐sharing capabilities and indicates that the total investment cost would be recovered in 8.76 years. These results show that the optimally controlled peer‐to‐peer energy‐sharing scheme is economically feasible in the South African context and may be applied in any global location with similar operating conditions.
Abundances of neutron-capture elements in thin- and thick-disc stars in the solar neighbourhood
Authors: Tautvaišienė G. , Viscasillas Vázquez C. , Mikolaitis Š. , Stonkutė E. , Minkevičiūtė R. , Drazdauskas A. , Bagdonas V. 
Published: March 2021

Aims. The aim of this work is to determine abundances of neutron-capture elements for thin- and thick-disc F, G, and K stars in several selected sky fields near the north ecliptic pole and to compare the results with the Galactic chemical evolution models, to explore elemental gradients according to stellar ages, mean galactocentric distances, and maximum heights above the Galactic plane.
Methods. The observational data were obtained with the 1.65 m telescope at the Molėtai Astronomical Observatory and a fibre-fed high-resolution spectrograph covering a full visible wavelength range (4000−8500 Å). Elemental abundances were determined using a differential line-by-line spectrum synthesis using the TURBOSPECTRUM code with the MARCS stellar model atmospheres and accounting for the hyperfine-structure effects.
Results. We determined abundances of Sr, Y, Zr, Ba, La, Ce, Pr, Nd, Sm, and Eu for 424 thin- and 82 thick-disc stars. The sample of thick-disc stars shows a clearly visible decrease in [Eu/Mg] with increasing metallicity compared to the thin-disc stars, bringing more evidence of a different chemical evolution in these two Galactic components. Abundance correlation with age slopes for the investigated thin-disc stars are slightly negative for the majority of s-process dominated elements, while r-process dominated elements have positive correlations. Our sample of thin-disc stars with ages spanning from 0.1 to 9 Gyr gives the [Y/Mg] = 0.022 (±0.015)−0.027 (±0.003)⋅age [Gyr] relation. However, for the thick-disc stars, when we also took data from other studies into account, we found that [Y/Mg] cannot serve as an age indicator. The radial abundance-to-iron gradients in the thin disc are negligible for the s-process dominated elements and become positive for the r-process dominated elements. The vertical gradients are negative for the light s-process dominated elements and become positive for the r-process dominated elements. In the thick disc, the radial abundance-to-iron slopes are negligible, and the vertical slopes are predominantly negative.
Topical oro-dispersible budesonide tablets for stricture prevention after near circumferential ESD for esophageal squamous cell cancer – a case report
Authors: Mathies Daniel , Oyama Tsuneo , Steinbrück Ingo , Dumoulin Franz Ludwig 
Published: March 2021

Abstract
Background Endoscopic resection is the treatment of choice for early esophageal cancers. However, resections comprising more than 70–80 % of the circumference are associated with a high risk of stricture formation. Currently, repetitive local injections and/or systemic steroids are given for prevention.
Case report We present here the case of a 78-year-old male patient who had a near circumferential endoscopic submucosal dissection for a pT1a mm, L0, V0, R0, G2 esophageal squamous cell cancer. At the end of endoscopic resection, 80 mg of triamcinolone was injected locally. The patient was then treated with oro-dispersible budesonide tablets (2 × 1 mg/day) and nystatin (4 × 100 000 I.E.) for 8 weeks. This treatment resulted in complete healing without any stricture formation and did not result in any complications.
Discussion Treatment with orodispersible budesonide tablets could help prevent strictures after large endoscopic resections in the esophagus.
Use of Electronic Health Records to Identify Exposure-Response Relationships in Critically Ill Children: An Example of Midazolam and Delirium
Authors: Zimmerman Kanecia O. , Spears Tracy G. , Cobbaert Marjan , Boakye-Agyeman Felix , Wu Huali , Cohen-Wolkowiez Michael , Watt Kevin M. , Benjamin Daniel K. , Becker Mara L. , Traube Chani , Smith P. Brian 
Published: March 2021

AbstractAdverse drug events are common in critically ill children and often result from systemic or target organ drug exposure. Methods of drug dosing and titration that consider pharmacokinetic alterations may improve our ability to optimally dose critically ill patients and reduce the risk for drug-related adverse events. To demonstrate this possibility, we explored the exposure-response relationship between midazolam and delirium in critically ill children. We retrospectively examined electronic health records (EHRs) of critically ill children <18 years of age hospitalized in the pediatric intensive care unit at Duke University; these children were administered midazolam during mechanical ventilation and had ≥1 Cornell Assessment of Pediatric Delirium (CAPD) score. We used individual-level data extracted from the EHR and a previously published population pharmacokinetic (PK) model developed in critically ill children to simulate plasma concentrations at the time of CAPD scores in 1,000 representative datasets. We used multilevel repeated measures models, with clustering at patient and simulation levels, to evaluate the associations between measures of drug exposure (e.g., concentration and area under concentration time curve) and delirium scores. We included 61 children, median age 1.5 years (range = 0.1–16.3), with 181 CAPD assessments. We identified similarities between simulated Empirical Bayesian parameter estimates from the EHR cohort and those from the PK model population. We identified a stronger association between drug concentration at the time of score and CAPD scores (coefficient 1.78; 95% confidence interval: 1.66–1.90) compared with cumulative dose per kilogram and CAPD scores (coefficient −0.01; 95% confidence interval: −0.01 to −0.01). EHR and PK models can be leveraged to investigate exposure-response relationships in critically ill children.
Rapid initiation of cell cycle reentry processes protects neurons from amyloid-β toxicity
Authors: Ippati Stefania , Deng Yuanyuan , van der Hoven Julia , Heu Celine , van Hummel Annika , Chua Sook Wern , Paric Esmeralda , Chan Gabriella , Feiten Astrid , Fath Thomas , Ke Yazi D. , Haass Nikolas K. , Ittner Lars M. 
Published: March 2021

Significance
The FUCCI reporter system allows live monitoring of the cell cycle via temporal expression of fluorescence markers of G0/1 or S/G2/M cell cycle phases. We found transient FUCCI reporter activity in naive neurons but not cell division, suggesting that the postmitotic state of neurons is rather a dynamic process of suppressing the cell cycle than a definite G0 state. Exposing neurons to amyloid-β resulted in death of the majority of neurons without cell cycle contribution. A subset of neurons that entered early stages of cell cycle and maintained this state were protected from amyloid-β-induced cell death. Consistently, we found high FUCCI reporter activity in the brains of mice that form amyloid-β through transgenic expression of the amyloid-β precursor protein.
“Diversity is a code word. And what it means is white genocide!”
Authors: Bourou Maria 
Published: March 2021

AbstractAlthough the language of extreme nationalism has been well-investigated, no studies have been concerned with the cinematic representation of racism. This article discusses the most prominent rhetorical strategies employed by neofascist characters in four race-related movies. Adopting a CDA perspective, it examines instances of hate speech targeted at minorities and identifies how immigrants and other social groups are constructed as antagonistic. Direct verbal attacks against minorities were found to be particularly humiliating due to the recurrent use of racial slurs, culture-specific stereotypes, directives and contemptuous remarks targeting the immigrants’ background. Deemed to possess an innate inclination to criminality, immigrants were presented as a threat to white rights, jobs and public safety. Modern multicultural environments, resembling dystopias, were characterised as the ideal places within which unlawfulness could thrive. The government was held responsible for abandoning the native population that was inflicted by ‘anti-white racism’. Finally, xenophobia and antisemitism intersected with gender-related bias.
Impoliteness in hip-hop music
Authors: Delis Panagiotis 
Published: March 2021

AbstractThe aim of this paper is to examine the functionality of impoliteness strategies as rhetorical devices employed by acclaimed African American and White hip-hop artists. It focuses on the social and artistic function of the key discursive element of hip-hop, namely aggressive language. The data for this paper comprise songs of US African American and White performers retrieved from the November 2017 ‘TOP100 Chart’ for international releases on Spotify.com. A cursory look at the sub-corpora (Black male/ Black female/ White male/ White female artists’ sub-corpus) revealed the prominence of the ‘use taboo words’ impoliteness strategy. The analysis of impoliteness instantiations by considering race and gender as determining factors in the lyrics selection process unveiled that both male groups use impoliteness strategies more frequently than female groups. It is also suggested that Black male and White female singers employ impoliteness to resist oppression, offer a counter-narrative about their own experience and self (re)presentation and reinforce in group solidarity.
“Congratulations! You just won the title for ‘worse Tinder opening line’”
Authors: Kavroulaki Evanthia 
Published: March 2021

AbstractOften preferred to its face-to-face counterpart, online dating has transformed the way we perceive practices relevant to meeting people, mostly because it offers “a wider pool of potential partners” (Heino, Ellison, and Gibbs 2010, 428). Despite its popularity, however, online dating is an under-researched area in general, crucially in linguistics. Looking at (mostly unsuccessful) naturally occurring initial interactions that have taken place on the popular Tinder application, the aim of this study is to gain some insights into the relationship among language aggression, impoliteness and communication failure in the context of flirting on Tinder. Results show that the most common way that users initiate interaction in this dataset is through sexually loaded language, which seems to be understood as a breach of the norms of appropriateness for first-time contact. Although Tinder has no manual to prescribe what should or should not be said in interaction, it transpires from the data that avoiding overstepping in terms of sexual matters (i.e. refraining from using sexually loaded language and/or innuendos) functions as an unwritten law which sparks impoliteness when not followed. Resulting impoliteness manifests itself mostly through the strategies of sarcasm and ignoring/snubbing the other, used to counteract (perceived) inappropriateness. Tracing this escalation of non-cooperative practices, from inappropriateness to impoliteness, also provides the opportunity to examine the emergence of playfulness and creativity as language behaviours interwoven with aggression. Therefore, online dating seems to lend itself well to the study of impoliteness and violation of norms of appropriate behaviour, providing opportunities for an expansion of contexts for linguistic analysis.
Disagreements in a feminist digital safe space
Authors: Krikela Sofia 
Published: March 2021

AbstractResearch on impoliteness has underlined the need for multidisciplinary approaches to impoliteness (Sifianou 2019a). In this article, I adopt the concept of “safe space”, as discussed in works on feminist digital media (Clark-Parsons 2018;Rentschler 2014), to explore how impoliteness relates to identity construction and the negotiation of power dynamics in the context of a Greek feminist website, constructed as a safe space. Both the concept of “safe space” and discursive and relational approaches to impoliteness (Angouri and Locher 2012;Graham 2007;Locher and Watts 2005,2008) relate to norms of appropriate behaviour in particular contexts and relational issues, such as power and identity.The data for this article comprise comments posted in discussions taking place in the Greek website ofA, mpa, in which participants became involved in disagreements.Culpeper’s (2010)framework for conventionalised impoliteness formulae is the starting point of the analysis, which takes a discourse analytical approach to investigate the intersection of identity and power in the site. Results show that criticisms and challenging questions are linked to the identification of participants with particular feminist positions, and to the negotiation of the power distribution between the administrator and themselves. Furthermore, the paradoxical nature of safe spaces plays an important role in these processes, as the use of impoliteness points to the negotiation of the norms for interaction among participants and reveals the struggle between individual expression and maintenance of safety.
Impoliteness across social media platforms
Authors: Teneketzi Korallia 
Published: March 2021

AbstractThis paper responds to the call for more comparative research across online social media platforms (Graham and Hardaker 2017, 808) and examines discourse across two such platforms, YouTube and Reddit. More specifically, it attempts to investigate whether the affordances of these platforms have an impact on the amount and form of impoliteness employed by their users.Data on a highly contested topic (the July 2018 wildfires in Attica, Greece) is studied both qualitatively and quantitatively. First, small but representative samples are qualitatively analyzed on the basis of the two major impoliteness types: implicational and conventionalized and their subcategories. In addition, swearword keywords extracted by means of corpus analysis tools are analyzed. It is shown that YouTube involves a great deal of (conventionalized) impoliteness (Culpeper 2011a) which could be due to factors such as the total absence of moderation, of post length limit and of detailed personal profiles as well as the presence of videos as stimuli for interaction. Considerably less impoliteness appears on Reddit, whose forum-like nature makes it a place that mostly invites civil interaction. Implicationally impolite (Culpeper 2011a) posts outnumber conventionally impolite ones, perhaps owing to the heavy moderation, the existence of public profiles and the size and coherence of the user community. It is concluded that, due to their characteristics, platforms seem to attract a certain userbase with its own motives and mindset, which in turn shape the impoliteness found within them.
Programmable droplet actuating platform using liquid dielectrophoresis
Authors: Frozanpoor Iman , Cooke Michael , Racz Zoltan , Bossons Ian , Ambukan Vibin , Wood David , Gallant Andrew , Balocco Claudio 
Published: March 2021

Abstract
Droplet motion has been a long-standing interest in microfluidics as it is often limited by the high operating voltages, which hampers the development of consumer applications. Forces generated by liquid dielectrophoresis (L-DEP) can enhance surface wetting, without requiring chemical modification or surface texturing. This work presents a droplet actuating platform to control the wetting behaviour of water droplets using L-DEP. The exploitation of high electric fields at the droplet solid–liquid interface reduced the operating voltages. The operating voltage can be further reduced, to as low as 30 V, by introducing a lubricant layer to minimise the droplet contact angle hysteresis, thus requiring a smaller L-DEP bulk force. The outcomes of this study will provide a new pathway for developing energy-efficient and reliable droplet actuating platforms to clean a variety of surfaces. A particular interest will be the application of this system in the automobile sector, for instance, to clean headlamps, sensors, cameras, door mirrors, front side glass, and rear screen.
Chemical kinetics and density measurements of OH in an atmospheric pressure He + O2 + H2O radiofrequency plasma
Authors: Brisset Alexandra , Gibson Andrew R , Schröter Sandra , Niemi Kari , Booth Jean-Paul , Gans Timo , O’Connell Deborah , Wagenaars Erik 
Published: March 2021

Abstract
This work presents experiments and modelling of OH densities in a radio-frequency driven atmospheric-pressure plasma in a plane-parallel geometry, operated in helium with small admixtures of oxygen and water vapour (He + O2 + H2O). The density of OH is measured under a wide range of conditions by absorption spectroscopy, using an ultra-stable laser-driven broad-band light source. These measurements are compared with 0D plasma chemical kinetics simulations adapted for high levels of O2 (1%). Without O2 admixture, the measured density of OH increases from 1.0 × 1014 to 4.0 × 1014 cm−3 for H2O admixtures from 0.05% to 1%. The density of atomic oxygen is about 1 × 1013 cm−3 and grows with humidity content. With O2 admixture, the OH density stays relatively constant, showing only a small maximum at 0.1% O2. The simulations predict that the atomic oxygen density is strongly increased by O2 addition. It reaches ∼1015 cm−3 without humidity, but is limited to ∼1014 cm−3 beyond 0.05% water content. The addition of O2 has a weak effect on the OH density because, while atomic oxygen becomes a dominant precursor for the formation of OH, it makes a nearly equal contribution to the loss processes of OH. The small increase in the density of OH with the addition of O2 is instead due to reaction pathways involving increased production of HO2 and O3. The simulations show that the densities of OH, O and O3 can be tailored relatively independently over a wide range of conditions. The densities of O and O3 are strongly affected by the presence of small quantities (0.05%) of water vapour, but further water addition has little effect. Therefore, a greater range and control of the reactive species mix from the plasma can be obtained by the use of well-controlled multiple gas admixtures, instead of relying on ambient air mixing.