bluuebunny/crossref_metadata_2025_split huggingface dataset:
Melodramatic tableaux vivants
Authors: Simonsen Karen-Margrethe 
Published: November 2024

Abstract
The novel Sab (1841) by the Cuban-Spanish writer Gertrudis Gómez de Avellaneda has
been called both a radical anti-slavery novel (Sommer 1991, Davies 2013) and an anti-abolitionist novel that only pays lip service to the
abolitionist cause (Williams 2008, Gomariz, 2009). In this article I approach this ambiguity by moving the focus from content to form and
from story to reader. Building on insights by Peter Brooks (1976), Jacky Bowring (2017) and David Denby
(1994), I argue that formally the novel is a melodramatic tragedy and that its melodramatic tableaux
vivants foster moral reflection in the reader by creating a clash between the ideal and the real and between surface
and depth. I develop this in critical dialogue with ideas about the (dis)connection between emotionality, empathy and
human rights developed by Lynn Hunt (Hunt 2007) and Lynn Festa (2006).
“No one can imagine my feelings”
Authors: Dwyer Erin Austin 
Published: November 2024

Abstract
This chapter details the ideological foundations of the emotional norms of slavery and debates over
whether those practices and feelings were tied to race or to slave status. It examines how theories of racialized
emotional difference circulated, and the proslavery ramifications of those ideas, as well as how formerly enslaved
people used the medium of slave narratives to refute white supremacist ideas about their affective inferiority and
subvert the expectations of sentimental audiences. Abolitionists’ argument that emotional differences were rooted in
slave status, not race, jeopardized proslavery ideology and individual slaveholders, as it meant that after
Emancipation, black people would expect the same emotional liberty as free people.
Haunting slavery
Authors: Robison Lori 
Published: November 2024

Abstract
This chapter considers the disruptive power of two nineteenth-century literary scenes, one from
Harriet Beecher Stowe’s Uncle Tom’s Cabin (1852) and one
from Lydia Maria Child’s A Romance of the Republic (1867),
in which portrayals of enslaved women activate the emotions of readers while challenging the usual workings of
sympathy. Drawing on the work of film theorist Todd McGowan, it locates in these scenes a Lacanian gaze that unsettles
readers by looking back at them, creating an opportunity for them to see ideology as ideology. Through this approach,
the chapter identifies a textual strategy that challenges slavery and racism while pushing back against the racial
objectifications inherent in the dynamics of sympathy: a strategy that could ultimately intervene in the cultural
construction of whiteness and blackness.
The blood-stained-gate
Authors: Murphy Laura T. 
Published: November 2024

Abstract
This chapter suggests that the slave narrative employs metonymy as an archive of memory when
authors are unwilling or unable to articulate the experience of trauma explicitly. Drawing on Frederick Douglass’s use
of the “blood-stained gate” metaphor as a repository for his emotional suffering, it describes how blood serves as a
metonymic vehicle for communicating authenticity in narratives in which affective descriptions run counter to the
ambitions of the genre. Ismael Beah’s A Long Way Gone: Memoirs of a Boy Soldier (2007) and Emmanuel
Jal’s War Child (2008) present contrasting cases of
blood’s capacity to serve as a repository for the emotional content of war. The trope of blood is then is used a lens
for understanding why audiences respond skeptically to slave narratives and suggests a less suspicious reading
practice among scholars and activists.
Reflecting on the LK-99 fervour: insights and future prospects
Authors: Sukhenko I V , Karbivskyy V L 
Published: November 2024

Abstract
A Copper-substituted lead apatite, named LK-99 by its authors, has recently emerged as a candidate for the world’s first ambient-conditions superconductor, but has since not demonstrated the anticipated properties when subject to independent scrutiny. In this review we cover the experimental and theoretical studies that have been dedicated to this unusual material, while briefly discussing the original arXiv papers. So far, all the synthesis methods result in the formation of a multiphase material with unpredictable structure and unstable stoichiometry. This is a core reason why the studies discussed in the review yield different results when it comes to magnetic, electrophysical properties and even visual appearance of the material. DFT studies of the electronic structure of Pb9Cu(PO4)6O are reviewed and compared with our original calculations, and the limitations of the DFT approach are discussed. While reviewing theoretical publications on the matter, we bring forward the flat-band superconductivity model and discuss the nature of flat bands and their ability to sustain superconducting transport in the model material. The possibility of the compound being a Mott insulator, given the specifics of its electronic structure, as well as the role of doping, is highlighted. Finally, we raise the question of viability of achieving superconductivity in doped apatites beyond the LK-99 formula.
First principle calculations of structural, electronic, and optical properties of XSnO3 (X: Ca, Mg, Sr) perovskite oxides
Authors: Larbi Rekia , Candan Ilhan , Cakmak Azad , Sahnoun Omar , Sahnoun Mohamed 
Published: November 2024

Abstract
The perovskite oxides XSnO3 have garnered significant attention due to their potential applications in various fields, including electronics, photonics, and renewable energy technologies. This study presents a comprehensive theoretical investigation of the structural, electronic, and optical properties of XSnO3 (X: Ca, Mg, Sr) compounds with density functional theory based on the full potential linearized augmented plane wave method. Our analysis begins with thoroughly examining the structural stability and lattice parameters of XSnO3 compounds, revealing their robust perovskite crystal structures. These compounds’ lattice constants, total energy, bulk modulus, and cohesive energy were determined. Subsequently, we delve into the electronic properties of XSnO3, elucidating their electronic band structures, density of states, and charge densities. The studied compounds are indirect bandgap semiconductors having band gaps in the visible range. Furthermore, our investigation extends to the optical properties of XSnO3, encompassing absorption spectra, refractive indices, energy loss function, reflectivity, extinction coefficient, and dielectric functions across a wide range of wavelengths. Overall, the excellent optical properties of these compounds make them suitable for optoelectronic applications.
Engineering the band structure of type-II MoSe2/WSe2 van der Waals heterostructure by electric field and twist angle: a first principles perspective
Authors: Yu Fangqi , Yang Weihua , Kang Jun , Huang Rao , Li Lei , Wen Yuhua 
Published: November 2024

Abstract
Type-II heterostructures composed of transition-metal dichalcogenides have attracted enormous attention due to their facilitation in efficient electron–hole separation. In this work, we performed density-functional theory calculations to systematically investigate the atomic and electronic structures of MoSe2/WSe2 van der Waals heterostructure. Its six high-symmetry configurations with different interlayer coupling under external electric field and twist angle were addressed. Our results reveal that all the configurations exhibit type-II band alignment and their band gaps can be effectively modulated by the electric field. Notably, the direct to indirect band gap transition only occurs in the configurations with strong interlayer coupling. Moreover, twist-induced symmetry breaking weakens the interlayer interactions, thus decreasing interlayer charge transfer. Owing to large interlayer distance and weak interlayer coupling, the band structure of the heterostructure remained unchanged for the twist angles ranging from 13.2° to 46.8°. These findings demonstrate the great potential of the MoSe2/WSe2 heterostructure for applications in optoelectronic and nanoelectronic devices.
Quantum spin-liquid in Ba3CuSb2O9 epitaxial thin films
Authors: Kaipamangalath Aswathi , Pathak Riya , Akram Wasim , Nath Ramesh , Maity Tuhin 
Published: November 2024

Abstract
Hexagonal perovskite materials are emerging quantum spin liquid (QSL) systems providing a fertile ground to realize novel quantum phenomena. The epitaxially grown thin films of such materials offer a compelling approach to utilize exotic quantum phases for device applications with better control over the structure. We fabricate the intriguing QSL triple perovskite Ba3CuSb2O9 epitaxially onto a MgO (100) substrate by pulsed laser deposition technique as well as in bulk form for comparison. The presence of only (00l) parallel planes of Ba3CuSb2O9 in x-ray diffraction validates the epitaxial growth of the thin film. Temperature-dependent magnetization of thin film reveals no magnetic ordering down to 400 mK, with a large antiferromagnetic Curie–Weiss temperature (

θ

CW

≈
−

11.68 K). This indicates strong magnetic frustration and QSL behaviour, similar to bulk Ba3CuSb2O9. The presence of magnetic correlations at low temperature (in the quantum spin liquid state) is further confirmed by analysing the low temperature magnetic isotherms. These experimental findings underscore the potential of this quantum material for its use in quantum technologies.
Dynamic calibration of a high-resolution wind tunnel model for ultra-low-range fluctuating surface pressure measurement
Authors: Schmeer Joy , Hayden Paul , Birch David M 
Published: November 2024

Abstract
Measuring surface pressures in a low-speed wind tunnel which are well-resolved in both space and time can be particularly challenging. A technique has therefore been developed for the simultaneous dynamic calibration of large numbers of pressure tappings on a wind tunnel model. A portable, variable-volume plenum is used to calibrate the model in situ. A forcing function consisting of sequential sinusoids at varying frequencies is used to obtain the spectral responses, with feedback control implemented to ensure consistent amplitudes independent of the plenum’s own dynamics. This discrete calibration technique is shown to significantly reduce uncertainty propagation compared to white noise, chirp or step functions. The effectiveness of the dynamic calibration is validated against laser diagnostics in turbulent flow. As a demonstration of the capability of this technique, spatially-resolved surface pressure statistics are then presented for the five wetted faces of a cube in an atmospheric wind tunnel turbulent boundary layer.
Chemo-mechanical benchmark for phase-field approaches
Authors: Kannenberg Thea , Prahs Andreas , Svendsen Bob , Nestler Britta , Schneider Daniel 
Published: November 2024

Abstract
Phase-field approaches have gained increasing popularity as a consequence of their ability to model complex coupled multi-physical problems. The efficient modeling of migrating diffuse phase boundaries is a fundamental characteristic. A notable advantage of phase-field methods is their ability to account for diverse physical driving forces for interfacial motion due to diffusive, mechanical, electro-chemical, and other processes. As a result of this versatility, phase-field methods are frequently employed in the fields of materials science, mechanics, and physics, and are continually undergoing development. To test the accuracy of these developments, it is indispensable to establish standardized benchmark tests, to ensure the thermodynamic consistency of studies carried out. This work presents a series of such tests based on chemo-elastic equilibrium states for Fe-C binary alloys, benchmarking the performance of a phase-field model with chemo-elastic coupling based on the grand potential density. Use of parameters for the Fe-C system from a Calphad database allows for the determination of the Gibbs free energy, thereby enabling the quantification of chemical driving forces. For a circular inclusion, the capillary driving force is derived on a geometrically motivated basis using the lever rule and expressed as a function of the chemical potential. These simulations contribute to the development of standardized benchmark tests that validate chemical, capillary, and mechanical driving forces separately and in combination. The present study compares phase-field simulation results with results from the analytic solution of chemo-elastic boundary value problems and the generalized Gibbs–Thomson equation.
Synthesis of nitrogen-doped carbon dot/tin disulfide nanosheet composite electro-catalysts for dye-sensitized solar cells
Authors: Chen Lin-Jiun , Yu Cheng-Ju , Sahoo Prasanta Kumar , Wang Yu-Xuan , Lin Yi-Xuan , Lee Chuan-Pei 
Published: November 2024

Abstract
Nitrogen-doped carbon dots (N-CDs) and vertically-grown tin disulfide (SnS2) nanosheets are synthesized via hydrothermal method and chemical vapor deposition technique, respectively. The SnS2 nanosheets are directly fabricated on flexible carbon cloth (CC), and then their basal planes are decorated with N-CDs. The as-prepared composite electrodes are used as the counter electrode for the application in dye-sensitized solar cells (DSSCs). The characterizations of N-CDs and SnS2 nanosheets are studied by high resolution transmission electron microscopy, scanning electron microscopic, energy dispersive x-ray spectrometer, Raman spectrometer and x-ray photoelectron spectroscopy etc. Moreover, the cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and photocurrent-density voltage are utilized to understand the electro-catalytic performance of N-CDs/SnS2/CC composite counter electrode. The N-CDs/SnS2/CC composite electrode shows higher cathodic reduction current density and lower charge transfer resistance in CV and EIS measurements, respectively, as compared to those of the electrodes with N-CDs or SnS2 alone. Meanwhile, the DSSC using N-CDs/SnS2/CC exhibits cell efficiency (η) of 7.68%, which is higher than those of cells having SnS2/CC (η = 7.54%) and N-CDs/CC (η = 5.66%) counter electrodes, respectively; it also reaches 94% cell efficiency of the cell using Pt/CC counter electrode (η = 8.15%). The design concept of the modification of the basal planes by defect-rich carbon dots (i.e. N-CDs) and highly-exposed edge sites (i.e. vertically-grown SnS2 nanosheets) makes promising route to enhance the performance of two-dimensional electro-catalysts.
Insights into stripping losses of negative ions in an ITER-like pre-acceleration system
Authors: Navarro A , Barnes M , den Harder N , Wünderlich D , Fantz U 
Published: November 2024

Abstract
The ELISE test facility at IPP Garching hosts an RF-driven negative hydrogen ion source and extraction and acceleration system. Its target is to demonstrate the performance foreseen for the ITER neutral beam injection (NBI) system in terms of extracted current density (329 A m−2 in hydrogen, 286 A m−2 in deuterium), electron-ion-ratio (

<

1) and pulse length (up to 3600 s in deuterium and 1000 s in hydrogen). NBI systems are compromised by a process commonly known as stripping losses (neutralization of negative ions before they achieve full acceleration). According to theoretical estimations, for a source filling pressure of

p

fill

=
0.3

Pa, 29% of the extracted

H

−

/

D

−

ions are lost by stripping in the ITER full-scale NBI system. Experimentally, stripping losses are monitored using Beam Emission Spectroscopy (BES). Previous experimental measurements of the stripping losses at ELISE yielded values around 1.7%, which were much lower than the 10% predicted for the pre-accelerator system. The notable difference has sparked concern about the conventional interpretation of the BES experimental measurements used at IPP. The Bavarian Beam Code for Negative Ions (BBCNI) is a full 3D particle tracking code that can also produce synthetic BES spectra. BBCNI is used to evaluate how accurately different analysis techniques determine the stripping losses from the BES. This is achieved by comparing the results with the total simulated count of stripping losses. The analysis method that produces the most accurate results is identified and then systematically applied to evaluate ELISE’s data from various experimental campaigns. For a nominal source filling pressure

p

fill

=
0.3

Pa an average of 5.8% is measured experimentally when evaluating the data with this method. Although higher than previously determined with BES, stripping losses are still smaller than predicted values. This may open the option to increase the filling pressure in the source as a means to facilitate achieving the targeted ITER conditions.
Numerical simulation of YSO jet collimated by toroidal magnetic fields and radiative cooling effect
Authors: Feng Li , Lv Chong , Yuan Wenqiang , Sun Wei , He Chuangye 
Published: November 2024

Abstract
The mechanism of generation and collimation of young stellar object jets remains an unsolved problem and is a research hotspot in contemporary astrophysics. Here, we conducted a two-dimensional cylindrical coordinates simulation experiment using radiative magnetic-hydro-dynamic FLASH code and systematically analyzed the effects of toroidal magnetic fields generated by Biermann battery term and radiative cooling effect on jet evolution. In the simulation, strong toroidal magnetic fields are generated at the boundary of the plasma flow. A comparison of jets generated in different cases indicates that the magnetic fields play a significant role in hydrocarbon (CH) plasma jet collimation, surpassing the impact of radiative cooling effects. Additionally, it is observed that the magnetic fields can alter knots velocities. This platform provides a way to investigate the role of toroidal magnetic fields in jet evolution without external devices and provides a better understanding of the evolution of protostellar jets.
Role of magnetic doping in topological HgTe and application of the Gram–Schmidt method for computing impurity states in quantum wells
Authors: Bugajewski D , Dietl T 
Published: November 2024

Abstract
The quantum spin Hall effect in non-magnetic and Mn-doped HgTe quantum well (QW) is strongly affected by Kondo scattering of edge electrons by holes localized on acceptors. A generalized eigenvalue method is usually employed for determining impurity binding energies from the multiband Kohn–Luttinger Hamiltonians in bulk samples and semiconductor quantum structures. Such an approach provides accurate values of the level positions but its applicability for determining the impurity localization radius can be questioned. As an alternative method we propose here the Gram–Schmidt orthogonalization procedure allowing to employ the standard eigenvalue algorithms and, thus, to determine both impurity level energies and the set of normalized eigenvectors. We apply this approach to singly-ionized acceptor states in HgTe QWs and obtain impurity level energies and localization radiuses even for states degenerate with the continuum of band states. Such information allows us to assess the energy of bound magnetic polarons in QWs doped with magnetic ions. We determine the polaron energies and discuss consequences of the resonant polaron formation on band transport in the bulk samples and QWs in the regimes of quantum Hall effects.
Study on the friction and wear properties of nickel-based-WC-10Ni composite coatings prepared on the surface of TC4 titanium alloy
Authors: Ma Shangbo , Xu Xiangping , Wang Xiling , Feng Yizheng , Xia Chunzhi , Teng Hong 
Published: November 2024

Abstract
A nickel-based WC-10Ni composite coating was fabricated via vacuum brazing at 1160 °C, using TC4 titanium alloy as the matrix, WC-10Ni powder as the hard phase, and BNi-5 as the brazing material. The study examined the coating’s microstructure and analyzed the impact of the WC-10Ni ratio and friction test temperature on its wear resistance, alongside a discussion of the wear mechanism. The results revealed that the hard layer of the composite coating comprised TiC, W, and minor amounts of Ti5Si3 and α-Ti, while the interface layer displayed a network structure of Ti2Ni and Ti5Si3. Using a Si3N4 ceramic ball as the counter-wear material, under conditions of a 10N load, 318 r min−1 rotational speed, 3 mm wear radius, and 30 min wear duration, the average friction coefficients of the three composite coatings were 0.289, 0.241, and 0.271, and their wear rates were 65.8%, 39.7%, and 52.7% of the substrate, respectively. The 50% WC-10Ni coating exhibited the best wear resistance, with adhesive wear being the dominant mechanism, accompanied by minor abrasive wear. Friction tests on the 50% WC-10Ni coating at 200 °C, 400 °C, 600 °C, and 800 °C revealed that the lowest wear rate, 0.35 × 10−5 mm3 N−1 m−1, occurred at 600 °C, where the average friction coefficient was 0.432 and oxidative wear was predominant. At 800 °C, the coating suffered significant damage, resulting in deteriorated wear resistance.
Rheology-dependent surface wave characteristics in an advanced geomaterial flexoelectric plate with viscoelastic coating
Authors: Seema  , Singhal Abhinav , Tiwari Rakhi , Gupta Vipin , Dutta Rachaita , Ahmad Hijaz , Das Soumik 
Published: November 2024

Abstract
This study investigates the transmission of seismic surface waves in a composite framework comprising a viscoelastic layer overlying a flexoelectric material. The study focuses on understanding the impact of different viscoelastic models (Maxwell, Newtonian, and Kelvin-Voigt) and interface conditions (smooth and welded contact) on the damping and dispersion characteristics of these waves. To achieve this, the study employs a variable-separable technique and appropriate boundary conditions to derive complex frequency relations for electrically open and short circuits scenarios. These relations are subsequently divided into real and imaginary parts to examine the dispersion and dampening properties, respectively. Numerical simulations are conducted to analyze the response of flexoelectric coefficient, viscoelastic layer thickness, and bonding parameter on phase velocity and dampening coefficient. The research findings indicate that the attenuation properties of the Maxwell and Newtonian models are lower compared to the Kelvin-Voigt model. Graphical comparisons highlight the influence of viscoelastic models and interface characteristics on wave propagation. This research can help in the development of sensors, energy harvesters, and wave manipulation devices that employ flexoelectric materials with viscoelastic coatings. Knowledge of surface wave dynamics in these structures is vital for their optimal performance.