bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dielectric Matching by the Unique Dynamic Dipoles in Hybrid Organic/Inorganic Superlattices toward Ultrathin Microwave Absorber
Authors: Cui Ruopeng , Li Yi , Huang Yujia , Wang Wei , Wan Chunlei 
Published: July 2023

AbstractThere is an urgent demand of ultrathin high‐performance microwave absorbing materials (MAMs) in the electromagnetic protection field. However, minimizing thickness is challenging mainly due to dielectric mismatch at high permittivity from excessive dielectric loss, leading to strong reflection at 2–18 GHz. Here, a hybrid TaS2/Co(Cp)2 superlattice is fabricated with alternating [TaS2] inorganic layers and [Co(Cp)2] organic layers. Dynamic Ta─Co dipoles offer a unique interfacial polarization relaxation mechanism involving the inversion and rotation of dynamic Ta─Co dipoles. The prolonged relaxation time of limited dynamic Ta─Co dipoles contributes to enhanced dielectric matching at high permittivity, which is essential for ultrathin high‐performance MAMs. Furthermore, the confinement of paramagnetic Co(Cp)2 molecules in the interlayer space of the diamagnetic TaS2 sublattice triggers unexpected ferromagnetism via interfacial magnetic coupling conducive to the improved microwave‐absorbing performance at reduced thickness. Therefore, it presents a 1.271‐mm thick ultrathin absorber that can attenuate up to 99.99% of electromagnetic wave energy with a broad effective absorption bandwidth of 4.05 GHz, thus pushing the limits of thickness of 2D‐based high‐performance MAMs. This paper demonstrates a new strategy toward ultrathin MAMs with tunable and decent electromagnetic loss derived from electrical and magnetic coupling at the atomic scale.
Sponge‐Like Porous‐Conductive Polymer Coating for Ultrastable Silicon Anodes in Lithium‐Ion Batteries
Authors: Yu Yuanyuan , Yang Chen , Jiang Yan , Zhu Jiadeng , Zhao Yingying , Liang Shuheng , Wang Kaixiang , Zhou Yulin , Liu Yuying , Zhang Junhua , Jiang Mengjin 
Published: July 2023

AbstractUrgent calls for reversible cycling performance of silicon (Si) requires an efficient solution to maintain the silicon‐electrolyte interface stable. Herein, a conductive biphenyl‐polyoxadiazole (bPOD) layer is coated on Si particles to enhance the electrochemical process and prolong the cells lifespan. The conformal bPOD coatings are mixed ionicelectronic conductors, which not only inhibit the infinite growth of solid electrolyte interphase (SEI) but also endow electrodes with outstanding ion/electrons transport capacity. The superior 3D porous structure in the continuous phase allows the bPOD layers to act like a sponge to buffer volume variation, resulting in high structural stability. The in situ polymerized bPOD coating and it‐driven thin LiF‐rich SEI layer remarkably improve the lithium storage performance of Si anodes, showing a high reversible specific capacity of 1600 mAh g−1 even after 500 cycles at 1 A g−1 along with excellent rate capacity of over 1500 mAh g−1 at 3 A g−1. It should be noticed that a long cycle life of 800 cycles with 1065 mAh g−1 at 3 A g−1 can also be achieved with a capacity retention of more than 80%. Therefore, we believe this unique polymer coating design paves the way for the widespread adoption of next‐generation lithium‐ion batteries.
Buckling resistance of hot‐finished CHS beam‐columns using FE modelling and machine learning
Authors: Rabi Musab , Abarkan Ikram , Shamass Rabee 
Published: July 2023

AbstractThe use of circular hollow sections (CHS) has increased in recent years owing to its excellent mechanical behaviour including axial compression and torsional resistance as well as its aesthetic appearance. They are popular in a wide range of structural members, including beams, columns, trusses and arches. The behaviour of hot‐finished CHS beam‐columns made from normal‐ and high‐strength steels is the main focus of this article. A particular attention is given to predict the ultimate buckling resistance of CHS beam‐columns using the recent advancement of the artificial neural network (ANN). Finite element (FE) models were established and validated to generate an extensive parametric study. The ANN model is trained and validated using a total of 3439 data points collected from the generated FE models and experimental tests available in the literature. A comprehensive comparative analysis with the design rules in Eurocode 3 is conducted to evaluate the performance of the developed ANN model. It is shown that the proposed ANN‐based design formula provides a reliable means for predicting the buckling resistance of the CHS beam‐columns. This formula can be easily implemented in any programming software, providing an excellent basis for engineers and designers to predict the buckling resistance of the CHS beam–columns with a straightforward procedure in an efficient and sustainable manner with least computational time.
Research-Based Learning (RBL), Curriculum, and Courses in Undergraduate Science Education in the Post-COVID-19
Authors: Elmehdi Hussein M. , Qawasmeh Raed A. L. , Gamouz Abdel Aziz , Arooj Mahreen , Hasan Kamrul , Shehadi Ihsan A. 
Published: July 2023

AbstractThis paper discusses the formal implementation of scientific research at all levels of university education; programs and courses as an approach being adopted in the post-COVID-19 era. Research-based learning (RBL) shall be used in delivering the research components in the undergraduate programs and courses. National, institutional, and individual research interests shall be addressed through defined modules and directed research projects impeded in the curriculum and course deliveries and assessments.
Investigating the Impact of Extracurricular Activities on the Academic and Social Skills of University Students in Post-Covid-19: A Case Study
Authors: Zaki Amel Fawzi 
Published: July 2023

AbstractIn the aftermath of COVID-19, education has been disrupted worldwide. Universities had to instantly adapt to online education taking into consideration all the factors that foster success of education in such unprecedented circumstances. However, online education negatively affected students’ academic and social skills. This study explores the impact of relaunching Extra-Curricular Activities (ECA) in the post-COVID-19 period on enhancing university students’ academic and social skills. The ECA used is magazine writing; it was launched in March 2021 at the Arab academy for Science, Technology and Maritime Transport/Sharjah; the outcome was the first issue of the students’ magazine Ibn Majid. The ECA aimed at enhancing students’ academic and social skills and increasing their engagement in classes, which was drastically affected due to the isolation and social distancing of online education. The study is conducted on the students who took part in the magazine aiming at identifying their perception of their skills enhancement. It adopts a quantitative and qualitative analysis of students’ answers to two questionnaires where they express the way they perceive their academic and social skills before, during and after online learning and upon joining the ECA. Findings show that students who joined this ECA experienced a productive learning environment that positively impacted their academic and social skills. Moreover, this project’s outcome played a significant role in motivating them to take part in future ECAs. The study recommends more implementation of product-based ECAs as one of the significant solutions to the online education problems.
Enhancing Student Learning Capacity in a Biotechnology Course by Employing Interteaching Strategy Compared to Instructor-Centered Approach
Authors: Soliman Sameh S. M. , Hamdy Rania , Soliman Youssef S. , Ghonaim Jana H. , Ibrahim Haidy O. , Ibrahim Osama Mohamed 
Published: July 2023

AbstractLearning a subject is a cumulative process that requires cooperation between educators and students to reach the best outcomes. Here, a modified Interteaching strategy was employed to enhance students’ engagement, learning capacity, and motivation, while learning new topics. Master’s students were given preparatory guides in news related to Nobel Prize-awarded scientists at the course’s beginning. The information described the scientist’s breakthrough in DNA-information biotechnology and highlighted the knowledge that was covered later in the course. Students discussed and evaluated their initial understanding. They asked regularly following every lecture to re-read and re-evaluate the same preparatory guide. The students’ achievements were assessed using formative feedback, summative evaluations, and conference-based discussion. Compared to the instructor-centered teaching style, Interteaching enhanced the students’ focus and motivation. In the four-lecture period, students’ understanding of the subject increased dramatically to >95%. Most of the students received ‘A’ grade, and they rate the overall course 4.5/5. Students’ attraction to the field increased 6 times. SWOT analysis indicated the success of the teaching style.
Hands-on Teaching: The Significance of Introductory Courses in Building Architectural Engineering Curriculum
Authors: Bleibleh Sahera , Bande Lindita , Adan Rahma 
Published: July 2023

AbstractThe implications of hands-on introductory courses in architectural engineering (AE) discipline influence students’ comprehension of the interdisciplinary nature of the field and help them build basic needed skills. This chapter reviews the recent inclusion of an introductory course to the Architectural Engineering Curriculum (AEC), at the United Arab Emirates University (UAEU), to provide general insights and to effectively engage teaching tools. Based on the program assessment in Spring 2018, a three credits course Arch 302: Introduction to Architectural Engineering, designed to be taught in a studio format, has been added to the AE program. The course includes a brief introduction to the AE professions, AE design process, and communication skills and digital tools. Through small project design exercises, the course applies multiple hands-on teaching methods to provide students with basic design skills and formal visual principles with an emphasis on developing creativity and effective communication. In addition to instructors’ experience in teaching the course, a survey has been conducted with AE students to collect insights on the course’s impact on their understanding of the interdisciplinary nature of the AE, and the subsequent design and building construction courses. This paper evaluates the course development, significance, and interrelationships with other courses aligned with the achievement of the course learning outcomes. The outcomes of this assessment shed light on the significance of introductory courses in improving students’ achievement in subsequent courses in terms of understanding the AE interdisciplinary scope of work and gained skills.
Perspectives on anomaly resolution
Authors: Vandermeulen Thomas 
Published: July 2023

Abstract
We examine in detail the process of resolving ’t Hooft anomalies by extending the symmetry of a theory. Specifically, we interpret the ingredients of existing prescriptions for anomaly resolution as the addition of topological operators with designated mixed anomalies, which can be interpreted as coupling our original field theory to a topological one. We show that, upon gauging, the presence of such mixed anomalies leads to a modified version of the original symmetry which now acts on the newly introduced operators, allowing for an overall anomaly-free action. We also show that the original, anomalous symmetry remains present in the theory. This analysis is applied to anomaly-resolving extensions by both ordinary and higher-form symmetries, leading to related but qualitatively distinct stories.
Global Stability for Charged Scalar Fields in an Asymptotically Flat Metric in Harmonic Gauge
Authors: Kauffman Christopher 
Published: July 2023

AbstractWe prove global stability for the charged scalar field system on a background spacetime, which is close to $$1+3$$

1
+
3

-dimensional Minkowski space and whose outward light cones converge to those for the Schwarzs-child metric at null infinity. The key technique to this proof is the use of a modified null frame, depending only on the mass M of the metric, which captures the asymptotic behavior of the metric at future null infinity. Our results are analogous to results obtained in Minkowski space by Lindblad and Sterbenz in (IMRP Int Math Res Pap 2006:52976, 2006) up to a change in coordinates, and will in the sequel be used to prove the full structure of the Einstein–charge scalar field system in these modified harmonic coordinates.
An Algebraic QFT Approach to the Wetterich Equation on Lorentzian Manifolds
Authors: D’Angelo Edoardo , Drago Nicolò , Pinamonti Nicola , Rejzner Kasia 
Published: July 2023

AbstractWe discuss the scaling of the effective action for the interacting scalar quantum field theory on generic spacetimes with Lorentzian signature and in a generic state (including vacuum and thermal states, if they exist). This is done constructing a flow equation, which is very close to the renown Wetterich equation, by means of techniques recently developed in the realm of perturbative Algebraic Quantum Field theory (pAQFT). The key ingredient that allows one to obtain an equation which is meaningful on generic Lorentzian backgrounds is the use of a local regulator, which keeps the theory covariant. As a proof of concept, the developed methods are used to show that non-trivial fixed points arise in quantum field theories in a thermal state and in the case of quantum fields in the Bunch–Davies state on the de Sitter spacetime.
On the Convergence of Nekrasov Functions
Authors: Arnaudo Paolo , Bonelli Giulio , Tanzini Alessandro 
Published: July 2023

AbstractIn this note, we present some results on the convergence of Nekrasov partition functions as power series in the instanton counting parameter. We focus on U(N) $${\mathcal N}=2$$

N
=
2

gauge theories in four dimensions with matter in the adjoint and in the fundamental representations of the gauge group, respectively, and find rigorous lower bounds for the convergence radius in the two cases: if the theory is conformal, then the series has at least a finite radius of convergence, while if it is asymptotically free it has infinite radius of convergence. Via AGT correspondence, this implies that the related irregular conformal blocks of $$W_N$$

W
N

algebrae admit a power expansion in the modulus converging in the whole plane. By specifying to the SU(2) case, we apply our results to analyze the convergence properties of the corresponding Painlevé $$\tau $$
τ
-functions.
Curiosities of two-dimensional planing
Authors: Doctors Lawrence J. 
Published: July 2023

AbstractThe traditional deep-water analysis of two-dimensional planing is studied in detail and applied to efficient splash-free and optimal profiles, as well as to flat plates. The methodology is used to analyze both free-to-rise and free-to-rise-plus-trim profiles. In some cases, the predictions exhibit unexpected discontinuous behavior for the lift, wetted length and other results, with respect to the parameters describing the curvature of the planing surface. These discontinuities are due to the nonlinearities inherent in the practical planing problem, as opposed to previous simplified analyses in which the wetted length was specified.
Direct syntheses of stereoisomers of 3-fluoro GABA and β-fluoroamine analogues of the calcium receptor (CaR) agonists, cinacalcet, tecalcet, fendiline and NPS R-467
Authors: Renault Yohann J. G. , Diao Jiayin , Cordes David B. , Leach Katie , O’Hagan David 
Published: July 2023

AbstractSynthetic routes following a sequential MacMillan organocatalytic asymmetric α-fluorination protocol for aldehydes and then reductive amination, have allowed ready access to bioactive β-fluoroamines. The approach is demonstrated with a short synthesis of (S)-3-fluoro-γ-aminobutyric acid (3F-GABA) and was extended to β-fluoroamine stereoisomers of cinacalcet, tecalcet, fendiline and NPS R-467, all allosteric modulators of the calcium receptor (CaR). Stereoisomers of the fluorinated calcimimetic analogues were then assayed in a CaR receptor assay and a comparison of β-fluoroamine matched pair stereoisomers revealed a binding mode preference to the receptor as deduced from conformations which will be favoured as a consequence of the electrostatic gauche effect.
Transcriptional repression of lncRNA and miRNA subsets mediated by LRF during erythropoiesis
Authors: Athanasopoulou Katerina , Chondrou Vasiliki , Xiropotamos Panagiotis , Psarias Georgios , Vasilopoulos Yiannis , Georgakilas Georgios K. , Sgourou Argyro 
Published: July 2023

Abstract
Non-coding RNA (ncRNA) species, mainly long non-coding RNAs (lncRNAs) and microRNAs (miRNAs) have been currently imputed for lesser or greater involvement in human erythropoiesis. These RNA subsets operate within a complex circuit with other epigenetic components and transcription factors (TF) affecting chromatin remodeling during cell differentiation. Lymphoma/leukemia-related (LRF) TF exerts higher occupancy on DNA CpG rich sites and is implicated in several differentiation cell pathways and erythropoiesis among them and also directs the epigenetic regulation of hemoglobin transversion from fetal (HbF) to adult (HbA) form by intervening in the γ-globin gene repression. We intended to investigate LRF activity in the evolving landscape of cells’ commitment to the erythroid lineage and specifically during HbF to HbA transversion, to qualify this TF as potential repressor of lncRNAs and miRNAs. Transgenic human erythroleukemia cells, overexpressing LRF and further induced to erythropoiesis, were subjected to expression analysis in high LRF occupancy genetic loci-producing lncRNAs. LRF abundance in genetic loci transcribing for studied lncRNAs was determined by ChIP-Seq data analysis. qPCRs were performed to examine lncRNA expression status. Differentially expressed miRNA pre- and post-erythropoiesis induction were assessed by next-generation sequencing (NGS), and their promoter regions were charted. Expression levels of lncRNAs were correlated with DNA methylation status of flanked CpG islands, and contingent co-regulation of hosted miRNAs was considered. LRF-binding sites were overrepresented in LRF overexpressing cell clones during erythropoiesis induction and exerted a significant suppressive effect towards lncRNAs and miRNA collections. Based on present data interpretation, LRF’s multiplied binding capacity across genome is suggested to be transient and associated with higher levels of DNA methylation.

Key messages

During erythropoiesis, LRF displays extensive occupancy across genetic loci.

LRF significantly represses subsets of lncRNAs and miRNAs during erythropoiesis.

Promoter region CpG islands’ methylation levels affect lncRNA expression.

MiRNAs embedded within lncRNA loci show differential regulation of expression.
Machining grade 4 titanium alloy by minimum quantity lubrication for enhanced sustainable manufacturing
Authors: Mathonsi Thabo Nelson , Laubscher Rudolph Frans 
Published: July 2023

AbstractMachining is a widely used class of industrial manufacturing operation, wherein cutting fluids play a vital role in terms of machining accurate dimensional quality objects due to their cooling, lubricant, and chip removal abilities. Although certain advanced cutting fluids have changed the manufacturing industry for the better, there are some environmental concerns associated with some of these fluids. The use and disposal of cutting fluids may be costly and subjected to stringent government laws. Hence, the ever-growing research conducted on environmentally friendly cutting fluids may lead to enhanced sustainable manufacturing. The aim of this investigation is therefore to investigate the viability of minimum quantity lubrication (MQL) during machining of titanium alloys with specific focus on the commercially pure grades (grade 4). A comparative study was conducted in order to establish the effects of different modes of lubrication, i.e., dry, wet, and MQL machining on titanium.
Noncommutative Bohnenblust–Hille inequalities
Authors: Volberg Alexander , Zhang Haonan 
Published: July 2023

AbstractBohnenblust–Hille inequalities for Boolean cubes have been proven with dimension-free constants that grow subexponentially in the degree (Defant et al. in Math Ann 374(1):653–680, 2019). Such inequalities have found great applications in learning low-degree Boolean functions (Eskenazis and Ivanisvili in Proceedings of the 54th annual ACM SIGACT symposium on theory of computing, pp 203–207, 2022). Motivated by learning quantum observables, a qubit analogue of Bohnenblust–Hille inequality for Boolean cubes was recently conjectured in Rouzé et al. (Quantum Talagrand, KKL and Friedgut’s theorems and the learnability of quantum Boolean functions, 2022. arXiv preprint arXiv:2209.07279). The conjecture was resolved in Huang et al. (Learning to predict arbitrary quantum processes, 2022. arXiv preprint arXiv:2210.14894). In this paper, we give a new proof of these Bohnenblust–Hille inequalities for qubit system with constants that are dimension-free and of exponential growth in the degree. As a consequence, we obtain a junta theorem for low-degree polynomials. Using similar ideas, we also study learning problems of low degree quantum observables and Bohr’s radius phenomenon on quantum Boolean cubes.