bluuebunny/crossref_metadata_2025_split huggingface dataset:
Segregation-induced strength anomalies in complex single-crystalline superalloys
Authors: Bezold Andreas , Vollhüter Jan , Karpstein Nicolas , Lenz Malte , Subramanyam Aparna P. A. , Zenk Christopher H. , Hammerschmidt Thomas , Spiecker Erdmann , Göken Mathias , Neumeier Steffen 
Published: January 2024

AbstractPushing the maximum service temperature of aircraft engines and industrial gas turbines is the major pathway to improve their energy efficiency and reduce CO2 emissions. This maximum is mostly limited by the temperature capability of key-component materials, including superalloys. In this alloy class, segregation of elements facilitates plastic deformation and is generally considered to cause softening during high-temperature deformation. Here, we show that segregation-assisted processes can also lead to strengthening and induce an anomalous increase of the yield strength. Atomic-resolution transmission electron microscopy and density functional theory calculations reveal a segregation-assisted dissociation process of dislocations at precipitate-matrix interfaces in combination with atomic-scale reordering processes. These processes lead to an inhibition of athermal deformation mechanisms and a transition to stacking fault shearing, which causes the strengthening effect. Unraveling these elementary mechanisms might guide a mechanism-based alloy design of future superalloys with enhanced high-temperature capabilities.
Étude de la dynamique des jardins partagés d’autoproduction de la ville de Québec. Une approche des systèmes agri-urbains
Authors: Mestiri Riadh , Berthold Étienne 
Published: January 2024

Cette étude applique l’approche des systèmes agri-urbains pour faire état d’une dynamique d’une forme d’agriculture urbaine, en prenant le cas des jardins partagés d’autoproduction (JPA) de la ville de Québec au Canada. L’analyse repose sur des entrevues et une revue de littérature grise, aboutissant à une typologie des JPA basée sur quatre dimensions spécifiques et une cartographie des sites. Deux périodes clés émergent dans le développement des JPA à Québec : la première, des années 1970 à 2010, est caractérisée par l’émergence de l’agriculture urbaine et la prédominance des jardins communautaires en pleine terre. La deuxième période, dans les années 2010, est marquée par une forte croissance des JPA, en particulier des « aménagements comestibles » (aménagements paysagers à vocation comestible), et une reconnaissance accrue de la multifonctionnalité de l’agriculture urbaine. Les organismes communautaires et associatifs jouent un rôle central dans cette croissance et la dynamique générale des JPA.
Analytics for all marketing majors: sparking interest in the uninterested
Authors: Dingus Rebecca , Black Hulda G. , Flink Nicole A. 
Published: January 2024

AbstractMarketing analytics has an impact on the role of every marketer in some way. However, faculty members often face challenges when recruiting students for courses focused on analytics, and many marketing students tend to avoid quantitative courses due to fear and hesitation. The lack of marketing pedagogy with classroom activities designed to help educators showcase marketing analytics as engaging, interesting, and practical adds to the problem. To meet this need, this paper presents a classroom activity focused on building interest in marketing analytics, designed to be completed in a single-class period in any marketing course by any instructor, regardless of expertise in analytics. Administered in four different marketing courses at three universities, results show that students experienced a significant increase in their awareness of, interest in, and excitement for marketing analytics. Students also experienced a significant decrease in how intimidating they perceive analytics to be. Qualitative comments provide more detail related to fears or hesitations that were lessened by the course activity. Overall, the results support that this activity provided students with a significant increase in their awareness of, interest in, and excitement for marketing analytics.
Comparative analysis of youth transition in bean production systems in Ghana and Cameroon
Authors: Nchanji Eileen , Acheampong Patricia , Ngoh Siri Bella , Nyamolo Victor , Cosmas Lutomia 
Published: January 2024

AbstractYouth transition in the common bean (Phaseolus vulgarisL.) value chain remains low in Ghana and Cameroon despite the potential of the bean sub-sector in reducing poverty, unemployment, and undernutrition. This study compared youth transition in the bean value chain in Ghana and Cameroon. It investigated how intersectional elements, including age, influence the uptake of bean production among the youth in these two countries. Data were collected from 266 participants from Ghana and 84 from Cameroon. The data were collected through focus group discussions (FGD) and in-depth interviews. The results demonstrated that Ghanaian youth disfavored bean production, while in Cameroon, youth favored bean production. In both cases, parents were instrumental in influencing youth choices. In Ghana, many parents did not approve of their children taking bean production as a primary occupation. By contrast, parents in Cameroon favored bean production and appeared to value agriculture, thus encouraging their children to venture into it. Despite the differences in Ghanaian and Cameroonian youth’ perceptions of agriculture, the challenges they faced that hindered their participation in the bean value chain remained the same: lack of financial support, limited access to land, and lack of technical know-how.
Design of an edge-truncated patch antenna (ETPA) for near-range vehicular RADAR applications
Authors: Nimmagadda Satyanarayana Murthy , Penke Satyanarayana , Padarti Vijaya Kumar , Vanka Saritha , Malleswari Nemalikanti Siva Naga 
Published: January 2024

In recent years, the evolution of vehicular safety systems and the burgeoning field of autonomous vehicles have underscored the need for advanced radar solutions tailored to these specific applications. By addressing this need, this paper presents an innovative radar antenna design—the Edge Truncated Patch Antenna (ETPA) integrated with a Complementary Split Ring Resonator (CSRR). Distinct from prevalent designs, our novel approach hinges on the unique properties of the CSRR to impart broad-spectrum characteristics to the antenna. This innovation culminates in the realization of an ultra-wide bandwidth of 6.24 GHz, which effectively spans from 24.03 to 30.27 GHz. This bandwidth alignment with the primary frequency range predominantly used in short-range vehicular RADAR applications positions the ETPA as a frontrunner in this domain. A noteworthy feature of our design is its compactness. With dimensions of 5.1 × 4.7 × 0.8 mm3, the proposed antenna stands out as one of the most space-efficient and performance-oriented designs in the contemporary literature. The rigorous simulation processes employed revealed an impressive consistency when juxtaposed with measured outcomes. Minor variations between the two are attributed to inevitable fabrication and soldering nuances. Our design process, from the initial conception to the final product, underscores the pivotal role of meticulous parameter optimization and innovative integration of the CSRR. In conclusion, the proposed ETPA, with its enhanced bandwidth, compact footprint, and consistent performance, establishes a new benchmark in the field.
Ferromagnetic topological states in monolayer vanadium halides toward heterostructure applications
Authors: Zhang Haopeng , Wang Peng , Hao Liyu , Wu Zhimin , Wu Weikang , Cheng Zhenxiang , Yang Tie 
Published: January 2024

Topological states in two-dimensional materials have garnered significant research attention in recent years, particularly those with intrinsic magnetic orderings, which hold great potential for spintronic applications. Through theoretical calculations, we unveil the superior band topology of monolayer vanadium trihalides, with a specific focus on V2Cl6. These two-dimensional compounds exhibit a half-metallic ferromagnetic ground state, showcasing excellent thermodynamic and mechanical stabilities. Remarkably, clean band crossings with complete spin polarization manifest as phase transitions between Weyl semimetal states and quantum anomalous Hall states under different magnetization directions, and both topological phases yield prominent edge states. Furthermore, Monte Carlo simulations estimate a high Curie temperature of up to 381.3 K, suggesting the potential for spintronic development above room temperature. Taking a step forward, we construct two heterojunctions utilizing selected substrates, MoS2 and h-BN. These substrates not only facilitate a suitable lattice integration but also have a negligible impact on the half-metallicity and band topology. These findings lay the groundwork for exploring practical applications of two-dimensional ferromagnetic topological states. Importantly, the presented material candidates have the potential to accelerate the development of room temperature applications and integrate spintronic devices.
Remnant loop quantum black holes
Authors: Borges H A , Baranov I P R , Sobrinho F C , Carneiro S 
Published: January 2024

Abstract
Polymer models inspired by Loop Quantum Gravity (LQG) have been used to describe non-singular quantum black holes with spherical symmetry, with the classical singularity replaced by a transition from a black hole to a white hole. A recent model, with a single polymerisation parameter, leads to a symmetric transition with same mass for the black and white phases, and to an asymptotically flat exterior metric. The radius of the transition surface is, however, not fixed, increasing with the mass. Following similar procedures, in a previous paper we have fixed that radius by identifying the minimal area on the transition surface with the area gap of LQG. This allowed to find a dependence of the polimarisation parameter on the black hole mass, with the former increasing as the latter decreases. It also permitted to extend the model to Planck scale black holes, with quantum fluctuations remaining small at the horizon. In the present letter we extend this analysis to charged black holes, showing that the Cauchy horizon lies beyond of the transition surface. We also show the existence of limiting states with zero surface gravity, the lightest one with Q = 0 and

m
=

2

/

4

, and the heaviest with

Q
=
m
=

2

/

2

. Using our solutions to approximate quasi-steady horizons, we show that Hawking evaporation leads asymptotically to these extremal states, leaving remnant black holes of Planck size.
Anharmonic theory of superconductivity and its applications to emerging quantum materials
Authors: Setty Chandan , Baggioli Matteo , Zaccone Alessio 
Published: January 2024

Abstract
The role of anharmonicity on superconductivity has often been disregarded in the past. Recently, it has been recognized that anharmonic decoherence could play a fundamental role in determining the superconducting properties (electron–phonon coupling, critical temperature, etc) of a large class of materials, including systems close to structural soft-mode instabilities, amorphous solids and metals under extreme high-pressure conditions. Here, we review recent theoretical progress on the role of anharmonic effects, and in particular certain universal properties of anharmonic damping, on superconductivity. Our focus regards the combination of microscopic-agnostic effective theories for bosonic mediators with the well-established BCS theory and Migdal–Eliashberg theory for superconductivity. We discuss in detail the theoretical frameworks, their possible implementation within first-principles methods, and the experimental probes for anharmonic decoherence. Finally, we present several concrete applications to emerging quantum materials, including hydrides, ferroelectrics and systems with charge density wave instabilities.
Linear response theories for interatomic exchange interactions
Authors: Solovyev I V 
Published: January 2024

Abstract
The linear response is a perturbation theory establishing the relationship between given physical variable and the external field inducing this variable. A well-known example of the linear response theory in magnetism is the susceptibility relating the magnetization with the magnetic field. In 1987, Liechtenstein et al came up with the idea to formulate the problem of interatomic exchange interactions, which would describe the energy change caused by the infinitesimal rotations of spins, in terms of this susceptibility. The formulation appears to be very generic and, for isotropic systems, expresses the energy change in the form of the Heisenberg model, irrespectively on which microscopic mechanism stands behind the interaction parameters. Moreover, this approach establishes the relationship between the exchange interactions and the electronic structure obtained, for instance, in the first-principles calculations based on the density functional theory. The purpose of this review is to elaborate basic ideas of the linear response theories for the exchange interactions as well as more recent developments. The special attention is paid to the approximations underlying the original method of Liechtenstein et al in comparison with its more recent and more rigorous extensions, the roles of the on-site Coulomb interactions and the ligand states, and calculations of antisymmetric Dzyaloshinskii–Moriya interactions, which can be performed alongside with the isotropic exchange, within one computational scheme. The abilities of the linear response theories as well as many theoretical nuances, which may arise in the analysis of interatomic exchange interactions, are illustrated on magnetic van der Walls materials CrX
3 (

X
=

Cl, I), half-metallic ferromagnet CrO2, ferromagnetic Weyl semimetal Co3Sn2S2, and orthorhombic manganites AMnO3 (

A
=

La, Ho), known for the peculiar interplay of the lattice distortion, spin, and orbital ordering.
A density-controllable 3D measurement system based on linear profile sensor and universal manipulator
Authors: Zhao Bochong , Zhang Liyan , Ye Nan 
Published: January 2024

Abstract
In order to offer a simple and efficient solution for obtaining point clouds, a modular 3D measurement system that incorporates an LPS mounted on a universal manipulator is developed. Unlike the requirement for electronic connections between the LPS and the robot to achieve hard synchronization, we employ a high-low-frequency collaborative strategy for soft synchronization, thereby eliminating the need for complex hardware synchronization modules. Since soft synchronization lacks the high-speed synchronous data acquisition of hard synchronization, we have also proposed an interpolation method on low density data to generate uniform higher-density point clouds, thus enabling a density-controllable point clouds acquisition approach. Experimental results demonstrate the effectiveness and versatility of the system.
Remaining useful life estimation of bearing using spatio-temporal convolutional transformer
Authors: Zhu De , Lyu Junwen , Gao Qingwei , Lu Yixiang , Zhao Dawei 
Published: January 2024

Abstract
The maintenance costs, productivity, health, and safety of mechanical equipment all heavily rely on the remaining usable life (RUL) of the bearings. Recently, the transformer has been widely used in the RUL field due to its ability to capture some of the degradation information of the bearing. However, the transformer is weak in acquiring local information and fails to extract temporal features from the degradation process. To solve the above problems, this paper proposes a spatio-temporal convolutional transformer (STCT) model, which mainly consists of the dual convolutional spatio-temporal network (DCSTN) and multi-scale transformer (MST). It not only captures the degradation features of the bearings from the temporal and spatial perspectives but also enhances the ability of the transformer to acquire local information. We propose DCSTN as a feature extraction module, and the proposed spatio-temporal attention as the core of the DCSTN can capture the relevant degradation state features at different moments. In addition, MST uses a new module of multi-scale dilated causal convolution combined with multi-head attention to realize the combination of global degradation information and local contextual information capturing ability. We demonstrate the effectiveness and sophistication of the STCT model by conducting comparative experiments with ablation experiments on publicly available datasets.
Large-scale preparation of CsPbBr3 perovskite quantum dot/EVA composite adhesive film by melting for crystal silicon solar cell
Authors: Xu Yafei , Yan Cong , Liang Hongfei , Huang Sheng , Feng Ping , Song Jian 
Published: January 2024

Abstract
Silicon solar cell is the most mature photovoltaic conversion device, and in order to further improve the performance of the device, application of downshifting films has become a research hotspot. In this paper, CsPbBr3 perovskite quantum dot/EVA composite adhesive film was prepared by melting method with CsPbBr3 perovskite quantum dot film under solution processing as masterbatch and EVA particles as excipient. The effect of synthesis conditions on the luminescence properties of the composite films were thoroughly studied. The optimized CsPbBr3 perovskite quantum dot/EVA composite adhesive film has excellent performance, and its light transmission reaches 85%. The CsPbBr3 perovskite quantum dot/EVA composite adhesive film absolutely improves the efficiency of silicon solar cells by 1.08%, which is much higher than that of pure EVA adhesive film (0.63%). In addition, the device efficiencies have almost no change after 30 d in the air, maintaining the working stability of the device and contributing to industrial applications. This study provides a novel, industrial and low-cost synthesis route for the synthesis of CsPbBr3 perovskite quantum dot/EVA composite adhesive film, which is expected to have broad application.
Upper bounds for the moduli of polynomial-like maps
Authors: Blokh Alexander , Oversteegen Lex , Timorin Vladlen 
Published: January 2024

AbstractWe establish a version of the Pommerenke–Levin–Yoccoz inequality for the modulus of a polynomial-like (PL) restriction of a polynomial and give two applications. First we show that if the modulus of a PL restriction of a polynomial is bounded from below then this restricts the combinatorics of the polynomial. The second application concerns parameter slices of cubic polynomials given by the non-repelling multiplier of a fixed point. Namely, the intersection of the so-called Main Cubioid and the multiplier slice lies in the closure of the principal hyperbolic domain, with possible exception of queer components.
Development and tuning of models for accurate simulation of CT spatial resolution using CatSim
Authors: Zhang Jiayong , Wu Mingye , FitzGerald Paul , Araujo Stephen , De Man Bruno 
Published: January 2024

Abstract

Objective. We sought to systematically evaluate CatSim’s ability to accurately simulate the spatial resolution produced by a typical 64-detector-row clinical CT scanner in the projection and image domains, over the range of clinically used x-ray techniques. Approach. Using a 64-detector-row clinical scanner, we scanned two phantoms designed to evaluate spatial resolution in the projection and image domains. These empirical scans were performed over the standard clinically used range of x-ray techniques (kV, and mA). We extracted projection data from the scanner, and we reconstructed images. For the CatSim simulations, we developed digital phantoms to represent the phantoms used in the empirical scans. We developed a new, realistic model for the x-ray source focal spot, and we empirically tuned a published model for the x-ray detector temporal response. We applied these phantoms and models to simulate scans equivalent to the empirical scans, and we reconstructed the simulated projections using the same methods used for the empirical scans. For the empirical and simulated scans, we qualitatively and quantitatively compared the projection-domain and image-domain point-spread functions (PSFs) as well as the image-domain modulation transfer functions. We reported four quantitative metrics and the percent error between the empirical and simulated results. Main Results. Qualitatively, the PSFs matched well in both the projection and image domains. Quantitatively, all four metrics generally agreed well, with most of the average errors substantially less than 5% for all x-ray techniques. Although the errors tended to increase with decreasing kV, we found that the CatSim simulations agreed with the empirical scans within limits required for the anticipated applications of CatSim. Significance. The new focal spot model and the new detector temporal response model are significant contributions to CatSim because they enabled achieving the desired level of agreement between empirical and simulated results. With these new models and this validation, CatSim users can be confident that the spatial resolution represented by simulations faithfully represents results that would be obtained by a real scanner, within reasonable, known limits. Furthermore, users of CatSim can vary parameters including but not limited to system geometry, focal spot size/shape and detector parameters, beyond the values available in physical scanners, and be confident in the results. Therefore, CatSim can be used to explore new hardware designs as well as new scanning and reconstruction methods, thus enabling acceleration of improved CT scan capabilities.
PROTO-SPHERA: a magnetic confinement experiment which emulates the jet + torus astrophysical plasmas
Authors: Alladio Franco , Micozzi Paolo , Boncagni Luca , Pau Annamaria , Naghinajad Shayesteh , Macera Samanta , Damizia Yacopo , Buratti Paolo , Filippi Francesco , Galatola Teka Giuseppe , Giammanco Francesco , Giovannozzi Edmondo , Iafrati Matteo , Lampasi Alessandro , Marsili Paolo 
Published: January 2024

Abstract
The PROTO-SPHERA experiment, built at the CR-ENEA laboratory in Frascati, was in part inspired by the jet + torus astrophysical plasmas, a rather common morphology in Astrophysics. This paper illustrates how the said plasma morphology can be reproduced in a laboratory with the setup of the PROTO-SPHERA experiment. The experiment as such displayed the appearance and sustainment of a plasma torus around an internal magnetized plasma centerpost (jet) by self-organisation; an entirely unexplored phenomenon to date. The remarkable ideal MHD stability of the PROTO-SPHERA plasma is extremely significant, as it is obtained in a simply connected geometry, inside a perfectly insulating vacuum vessel, and without the need of a nearby stabilizing conducting shell. The concluding sections of this paper deal with application of force-free fields to the Pulsar Wind Nebulae morphology and present an extension of the well-known split-dipole model. Such an extension provides a natural description of the presence of tori around the Pulsar plasma jets. In addition, similarities and differences between the laboratory and the astrophysical jet + torus plasmas are detailed.