bluuebunny/crossref_metadata_2025_split huggingface dataset:
High-harmonic generation in solids from a high-energy fiber laser system
Authors: Boukhaoui D. , Mikhneva A. , Idlahcen S. , Houard J. , Godin T. , Guiramand L. , Blum I. , Amrani F. , Gérôme F. , Benabid F. , Gauthier D. , Boutu W. , Merdji H. , Vella A. , Hideur A. 
Published: February 2025

We demonstrate high-harmonic generation (HHG) in solids using a high-energy fiber laser system operating at 1550 nm. The driving few-cycle source consists of an erbium-doped fiber chirped pulse amplifier combined with a post-compression stage featuring a gas-filled hollow-core photonic crystal fiber (HC-PCF). The nonlinear self-compression process in the HC-PCF enables the generation of ultrashort pulses with sub-50 fs durations and μJ-level energies at a 660 kHz repetition rate. Perturbative and non-perturbative harmonics were subsequently generated when focusing the few-cycle pulses into zinc oxide (ZnO) and magnesium oxide (MgO) bulk samples. In the latter, in particular, we observed the generation of extreme ultraviolet harmonics up to H29 (below 55 nm), highlighting the remarkable potential of such a platform for the development of compact HHG sources.
Temporal information in sentence-final particles
Authors: Jiang Yan 
Published: February 2025

Abstract
This paper scrutinizes the claim that modern Shanghainese has sentence-final particles tse and keh that have tense-marking functions. We review works by Qian (2006; 2009), Chao (1926) and Li, Thompson & Thompson (1982) and analyze Shanghainese missionary texts on the use of these SFPs. Through a functional-discoursal investigation, we identify the IN-cluster use and the END-cluster use of tse. We take the temporal marking function of tse as a consequence of its discourse function, which introduces a (con)-current reference time in the discourse. On the other hand, we take keh as an assertion particle, whose occasional sense of recent past comes from its confirmation of a completed event.
Comparing Chinese and British entrepreneurial pitches in reality TV shows
Authors: Zhang Huiyu , Liu Honglv , Deng Wujing , Wei Yuanhong 
Published: February 2025

Abstract
This paper aims to explore and compare how entrepreneurs in different cultures mobilize evaluative linguistic resources to perform self-promotion in entrepreneurial pitches. Through corpus-based quantitative and qualitative analyses of 160 pitches from two venture capital reality TV shows, the UK’s Dragons’ Den and its Chinese version He Huo Zhong Guo Ren, this study scrutinizes the functions and features of Attitude and Graduation resources in entrepreneurial pitches and conducts further cross-culture comparisons. It is found that all entrepreneurs frequently use positive Attitude resources and upscaled Graduation resources to align investors with the value position being promoted and generate emotional appeal, so as to achieve their pragmatic intent of self-promotion. As for cross-cultural differences within the different social contexts of business culture, Chinese entrepreneurs use Judgment and Intensification resources more frequently and resort more to authoritative institutions, highlighting entrepreneurial commitment and achievements in the pitch process, while British entrepreneurs place more emphasis on the product, including its innovativeness, markets, and usability. With these findings, this study contributes to the literature on self-promotion discourse and cross-cultural pragmatics by exploring and comparing the evaluative resources and linguistic features of entrepreneurial pitches in different cultures.
Influence of circuit parameters on the electroluminescence characteristics of single-contact-driven micro-LEDs
Authors: Li Zongtao , Yuan Pan , Liang Jiachao , Li Jiasheng 
Published: February 2025

Abstract
The continued miniaturization of micro-light-emitting-diodes (Micro-LEDs) presents huge challenges for chip yield testing by using electrical contact probes. As showing significant advantages in chip inspection with low damage, low technical requirements and high applicability, the single-contact driving method is emerging as a burgeoning research focus. However, the underlying mechanism of this driving mode remains poorly understood, particularly the lack of direct physical descriptions of the electroluminescence (EL) process and effective driving optimization strategies of micro-LEDs. Herein, finite element simulation is applied to quantitatively explore and analyze the intrinsic effects of circuit parameters on the EL characteristics of single-contact-driven micro-LEDs (SCD micro-LEDs), including driving waveform, amplitude, frequency and the capacitance value of sapphire substrate. Through comparison with experimental results, increasing the amplitude of driving voltage and the capacitance value of sapphire substrate within a certain range, adjusting the frequency to an appropriate level and using the square wave are all conducive to achieve high stability and high efficiency of SCD micro-LEDs. Our work lays a theoretical foundation for the study of the operation mechanism of SCD micro-LEDs, which is expected to provide a certain guiding role for improving its EL characteristics and to promote the application of this mode in the field of chip detection.
A fourth-degree fluid dispersion relation to study linear azimuthal oscillations in Hall thrusters
Authors: Rojas Contreras Fernando 
Published: February 2025

Abstract
The principal objective of this work was to derive a linear dispersion relation considering density, momentum, and energy conservation equations for electrons where we can assess thermal effects along with momentum exchange collisions and explore if this type of elastic collisions could act as an instability mechanism. So, we derived a fourth-degree dispersion relation from a two-fluid plasma of ions (cold, non-collisional, unmagnetized, and singly charged) and electrons (hot, collisional, and magnetized with inertia). Then, to validate the resulting mathematical expression, we applied some simplifying conditions made in other studies, confirming that our 4th-degree dispersion relation is a generalization of some linear models proposed earlier. Thus, we evaluated our model with SPT-100 Hall Thruster data, finding two azimuthal unstable modes with two instability regions each. The first mode, dominant near the anode extending to the beginning of the acceleration region with a frequency spectrum from ∼3 KHz to ∼100 KHz, corresponded to an instability related to momentum exchange collisions. The second one, although dominant in the plume region with a frequency spectrum from ∼0.1 KHz to ∼0.23 KHz, corresponded to a rotating spoke instability where elastic collisions act as a damping factor, especially inside the discharge chamber where we had the maximum rate of electron-neutral collisions. Furthermore, when we compared our results with those of other dispersion relations, we saw that elastic collisions could represent a source of instability or damping, depending on the nature of the unstable modes. Finally, we also assessed the relative importance of electron inertia over the development of instabilities, finding that when we have a model with temperature perturbations and collisional effects aside from plasma non-uniformities, density, and electrostatic fluctuations, inertia seems to be of minor significance, nevertheless, in simplified models without energy conservation equation and thermal effects, inertia has a relevant impact over the instability.
Surface modification in FAPbI3 perovskites using methyl-substituted benzene derivatives: impact of functional groups and methyl position
Authors: Tahir Muhammad , Feng XiangXiang , Li Yunhao , Gao Jinqi , Aslam Fawad , Sadiq Muhammad Irfan , Liu Biao , Yang Junliang 
Published: February 2025

Abstract
Perovskite materials are promising candidates for solar cells and other electronic devices due to their exceptional optoelectronic properties. However, the stability and performance of these materials can be significantly influenced by surface modifications. In this study, we investigate the surface modification of FAPbI3 Perovskites using methyl-substituted benzene derivatives. Specifically, we examine the impact of the functional groups and methyl position in these derivatives on the structure, electronic and optical properties of the FAPbI3 Perovskite. The study shows that 3,4,5-trimethylbenzene (TMB) derivatives with Pyridine-N, −NH2, −COOH and −OCH groups increase FAPbI3 Perovskite stability due to low adsorption energy. However, the doping with these molecules change the electronic properties of FAPbI3 Perovskite solar cell. There are remarkable change in work function shift (WFS) of Perovskite surface have been happened, initially ascribable to the effect of interfacial charge transfer and inherent dipole moment of molecules. Moreover, Pyridine-N, −NH2, −COOH and −OCH functionalities directly contribute to the band-edge alignment of the FAPbI3 Perovskite. Optical properties show that these exhibit significant absorption properties, with an absorption strength of up to 23.79%, surpassing that of the pristine FAPbI3 Perovskite. Furthermore, the strategic placement of methyl groups at the 1, 3, and 5 positions on the benzene ring was analyzed for its impact on the properties of FAPbI3. While a significant variation in structural and electronic characteristics was observed, the optical properties, in contrast, showed minimal variation.
Enhanced nanolaser power for metamaterial waveguide using Bragg reflector and PSO algorithm
Authors: Kadhim Nawres M , Vahed Hamid , Soofi Hadi 
Published: February 2025

Abstract
This work enhanced the laser output power from a nanolaser device utilizing an InGaAsP waveguide. We added the DBR structure to the meta-waveguide gain strips with 14 waveguides. Then, we used the particle swarm optimization (PSO) algorithm to improve the dimensions, especially the meta-WG’s width and the DBR structure’s x, y, span, and period dimensions. From this new design, we obtained an increase in the output laser power in both the backward and forward directions, respectively, as the value of the increase in the backward direction reached ten orders of magnitude, meaning an output power of 2 mW. In comparison, it increased the laser output power in the forward direction by 2.61 orders of magnitude, indicating an output power value of 0.7 mW. This increase was achieved while maintaining the original device dimensions and operating at room temperature.
Variability of Central Stars of Planetary Nebulae with the Zwicky Transient Facility. I. Methods, Short-timescale Variables, and the Unusual Nucleus of WeSb 1*
Authors: Bhattacharjee Soumyadeep , Kulkarni S. R. , Kong Albert K. H. , Tam M. S. , Bond Howard E. , El-Badry Kareem , Caiazzo Ilaria , Chornay Nicholas , Graham Matthew J. , Rodriguez Antonio C. , Zeimann Gregory R. , Fremling Christoffer , Drake Andrew J. , Werner Klaus , Rodriguez Hector , Prince Thomas A. , Laher Russ R. , Chen Tracy X. , Riddle Reed 
Published: February 2025

Abstract
A complete understanding of the central stars of planetary nebulae (CSPNe) remains elusive. Over the past several decades, time-series photometry of CSPNe has yielded significant results including, but not limited to, discoveries of nearly 100 binary systems, insights into pulsations and winds in young white dwarfs, and studies of stars undergoing very late thermal pulses. We have undertaken a systematic study of optical photometric variability of cataloged CSPNe, using the light curves from the Zwicky Transient Facility (ZTF). By applying appropriate variability metrics, we arrive at a list of 94 highly variable CSPN candidates. Based on the timescales of the light-curve activity, we classify the variables broadly into short- and long-timescale variables. In this first paper in this series, we focus on the former, which is the majority class comprising 83 objects. We report periods for six sources for the first time, and recover several known periodic variables. Among the aperiodic sources, most exhibit a jitter around a median flux with a stable amplitude, and a few show outbursts. We draw attention to WeSb 1, which shows a different kind of variability: prominent deep and aperiodic dips, resembling transits from a dust/debris disk. We find strong evidence for a binary nature of WeSb 1 (possibly an F-type subgiant companion). The compactness of the emission lines and inferred high electron densities make WeSb 1 a candidate for either an EGB 6-type planetary nucleus, or a symbiotic system inside an evolved planetary nebula, both of which are rare objects. To demonstrate further promise with ZTF, we report three additional newly identified periodic sources that do not appear in the list of highly variable sources. Finally, we also introduce a two-dimensional metric space defined by the von Neumann statistics and Pearson Skew and demonstrate its effectiveness in identifying unique variables of astrophysical interest, like WeSb 1.
Optimizing hybrid fiber concrete: an experimental analysis of steel and polypropylene fiber composites using RSM
Authors: Khan Muhammad Aftab , Khan Qaiser uz Zaman 
Published: February 2025

Abstract
Concrete inherent brittleness, limits its performance under various loading conditions, posing challenges in high-performance applications. Hybrid fiber-reinforced concrete (HYFRC), incorporating both steel and polypropylene fibers, has emerged as a promising solution to enhance crack resistance of concrete, its durability, and overall mechanical properties. This study investigates the mechanical and microstructural properties of HYFRC through a series of comprehensive experiments. Specifically, the study evaluates workability, compressive strength, split tensile strength, and microstructural characteristics using x-ray radiography and Scanning Electron Microscopy (SEM). The experimental setup involved 101 trial mixes, producing 1,212 standard cylinders, each incorporating varying combinations of steel fibers (SF) and polypropylene fibers (PP) across four hybridization schemes. The SF volume ratios were varied from 0.25% to 1.5%, and PP fiber ratios ranged from 0.2% to 1.0%. Key findings include significant improvements in compressive strength (up to 4290 psi) and split tensile strength (up to 554 psi) compared to non-fibrous control samples. Optimization through Response Surface Methodology (RSM) and ANOVA revealed an optimal mix achieving a slump of 3.32 inches and notable improvements in strength (61.19% for split tensile and 40.39% for compressive strength). Microstructural analysis confirmed that enhanced strength was primarily due to the development of calcium silicate hydrate (C-S-H) gel structures within the hybrid matrix. This study contributes valuable insights into the design and performance of HYFRC, laying the foundation for future investigations into its application in dynamic loading scenarios, such as bridge piers subjected to seismic forces. The findings support the potential of HYFRC as a durable, high-performance material for critical infrastructure, and contributing in a research gap in fiber-reinforced concrete.
Experimental study on physical and mechanical properties of expanded soil improved by lime activated blast furnace slag
Authors: Jia Jilong , Zhao Yuxuan , Hu Jianlin , Cheng Wei 
Published: February 2025

Abstract
To address environmental concerns related to cement-stabilized expansive soil and the safety risks of caustic-activated blast furnace slag, this study explores the use of lime-activated blast furnace slag as an alternative stabilizer in northern Hebei, China. The effects of slag dosage, curing time, and osmotic pressure on the expansion, osmotic properties, and strength of the improved soil were evaluated through free expansion rate, permeability coefficient, and unconfined compressive strength tests. Results show that adding slag-lime significantly reduces soil expansion. As slag content increases, the free expansion rate decreases exponentially. During the curing period of 3–7 days, expansion declines and stabilizes between 7–14 days. Similarly, the permeability coefficient permeability coefficient decreases with higher slag content, following a quadratic trend. Under osmotic pressures of 0.1–0.2 MPa, the permeability coefficient permeability coefficient increases but stabilizes between 0.2–0.4 MPa.Furthermore, slag-lime significantly enhances unconfined compressive strength, which increases linearly with slag content. The stress–strain curve follows a logistic function in the rising stage and a rational fractional equation in the descending stage.This study demonstrates that lime-activated blast furnace slag is a sustainable and effective alternative for stabilizing expansive soils while reducing dependence on cement.
Oppressive Praise
Authors: Holroyd Jules 
Published: February 2025

Abstract
This is a book about praise: in particular, the expressions we use to elevate others, esteem them, celebrate the things they do. These expressions are a pervasive feature of social life: within families, between friends or colleagues, in institutional settings such as education and employment. Despite this, praise has attracted comparatively little philosophical attention, perhaps because—unlike its putative counterpart, blame—praise is assumed to be a benefit; an expression of positive appraisal that requires little scrutiny or justification. This book argues that, on the contrary, our practices of praising can be harmful, and implicated in oppression. It introduces cases of oppressive praise, using them to develop a diagnosis of when and why praise is oppressive, and an account of praise that focuses on its function in affirming and entrenching values in a community. This role of praise is essential to understanding moral appraisal as a social practice, and one that can be implicated in social hierarchy and oppression. The book offers an ameliorative framework: a set of norms for how we express praise; and how we might respond to and resist oppressive praise.
Three Norms of Praise
Authors: Holroyd Jules 
Published: February 2025

Abstract
This chapter evaluates three norms that might govern the expression of praise. Even where praise is deserved, its expression might not be appropriate. Norms that might govern expressions of praise include: a norm concerning its distribution, across people or groups; another concerning the standing of the person expressing praise; and an epistemic norm, concerning what praisers ought to reasonably believe about the targets of praise. This chapter argues that attending to the oppressive potential of praise, and its function in signalling values in a moral community, enables us to better evaluate and articulate each of these norms.
Receiving and Resisting Oppressive Praise
Authors: Holroyd Jules 
Published: February 2025

Abstract
This chapter returns to the harms that oppressive praise can be implicated in. It can contribute to forms of oppression such as cultural imperialism, exploitation, powerlessness, and marginalization; it does so by entrenching social hierarchies, perpetuating stereotypes and distorting our moral sensitivities. This chapter then considers strategies for resisting oppressive praise, evaluating the merits and limitations of responses such as self-deprecation, outright rejection, solidarity-based third-party rejections, and forms of non-reactive resistance, including social transformations and material redistributions. The latter is appealing since expressions of oppressive praise are best understood as implicated in structurally unjust processes (in Iris Marion Young’s sense).
Institutionalized Forms of Praise
Authors: Holroyd Jules 
Published: February 2025

Abstract
This chapter adds to existing debates about the wrongs of, and responses to, problematic public statues. I advance an analysis of (some) problematic statues in terms of oppressive praise, or oppressive honours. The analysis of praise that has been developed across the earlier chapters helps us to characterize the wrongs and harms at issue, and provides a framework for considering how to respond. The diagnosis set out in this chapter relies on articulating not just what statues represent or express, but the speech act of praising they (sometimes) perform. This chapter shows how attention to oppressive praise provides helpful resources for responding to problematic statues; and it raises doubts about whether statues are ever an apt medium for expressing praise.
Schubert’s Untrue Symphony
Authors: Reece Frederick 
Published: February 2025

Abstract
Chapter 3, “Schubert’s Untrue Symphony,” introduces key principles characteristic of modern cultures of forgery. In 1975, Swiss-born East German musicologist Harry Goldschmidt received a curious letter from a West German journalist and amateur musician named Gunter Elsholz claiming that Schubert’s lost “Gmunden-Gastein” Symphony, D. 849, had been rediscovered after a century and a half in the wilderness. Institutions including the Neue Schubert-Ausgabe responded to Goldschmidt by using source criticism in an attempt to repudiate the composition. Yet, despite this evidence, the town-hall debate that preceded the symphony’s 1982 premiere in Hanover concluded with the majority of lay listeners siding with Goldschmidt—i.e., in favor of Schubert’s authorship—when asked to vote on the matter in an unprecedented act of public musicological judgment. The case of Schubert’s Untrue Symphony was only resolved two years later when the Federal Institute for Materials Testing [Bundesanstalt für Materialprüfung], or BAM, in West Berlin used groundbreaking forensic technologies to test the ink and paper of the score itself. However, in the wake of this new historical development, the uncomfortable fact remained that it was laboratory analysis that had resolved the matter, and not the work’s sources or its sounding structure as traditionally understood.
From the Four Directions
Authors: I. Córdova Hidalgo Amalia 
Published: February 2025

Abstract
This chapter offers an overview of the emergence of Indigenous media projects across Latin America, describing the various strategies that Indigenous media-making collectives and organizations have developed to support processes of Indigenous recognition, self-representation, and self-determination. The chapter maps the key projects that have achieved continuity in media production, within distinctly different national and regional contexts. It outlines the precarious yet widespread support system this work has brought together, which reaches beyond regional and national boundaries, and examines the links between funding, production, and distribution that form and strengthen local, national, regional, and increasingly global Indigenous linkages. The chapter outlines what holds this community of practitioners together: a diverse yet collectively driven spirit, and a network of solidarity and activism.
Following the Path of the Serpent
Authors: I. Córdova Hidalgo Amalia 
Published: February 2025

Abstract
This chapter provides an in-depth account of the practices developed by the largest and longest-running Indigenous film festival of Abya Yala, the Festival International de Cine y Video de los Pueblos Indígenas, and its sister festival, Premio Anaconda. Both are itinerant, international festivals run by CLACPI and its partners. These festivals are attuned to the dynamics of circulating audiovisual media embedded in the struggle for Indigenous autonomy and resistance. The chapter identifies their organizational structures, funding, and circulation strategies, and discusses their incorporation of Indigenous methodologies. It closes with a significant shift in the alignment of Indigenous political projects with the work of CLACPI and reflects on the long-term impact and challenges of this organization over its almost forty-year history.