bluuebunny/crossref_metadata_2025_split huggingface dataset:
The interplay of vibronic and spin–orbit coupling in the fluorescence quenching in trans-dithionated PDI
Authors: Dakua Kishan Kumar , Rajak Karunamoy , Mishra Sabyashachi 
Published: September 2023

Organic chromophores such as the thionated derivatives of perylene diimides (PDIs) show prolonged triplet-excited state lifetimes in contrast to their pristine parent PDI molecule, which shows near unity fluorescence quantum yield. The excited state dynamics in the trans-dithionated PDI (S2-PDI) are studied here. Unlike PDI, the photo absorbing ππ* state of S2-PDI is in close proximity to quasi-degenerate nπ* states. The latter exhibits an interesting vibronic problem leading to the breaking of orbital symmetry mediated through non-totally symmetric vibrations. The time-dependent quantum dynamics are studied with a diabatic model Hamiltonian involving three singlet and three triplet states coupled via 22 vibrational modes. A combined effect of multiple internal-conversion and inter-system crossing (ISC) pathways leads to population transfer from the 1ππ* state to the 3ππ* state via the nπ* states, with an overall ISC rate of 0.70 ps that compares well with the experimental value. The calculated absorption spectra for PDI and S2-PDI reproduce the essential vibronic features in the observed experimental spectra. The dominant vibronic progressions are found to have significant contributions from the vinyl stretching modes of the PDI core.
Comparison of oral and written argumentation by Ultra-OrthodoxJewish students
Authors: Tsemach Ehud 
Published: September 2023

AbstractThis study examines the relations between oral and written argumentation in two contexts: written assignments and structured interviews among Ultra-Orthodox (Haredi) Jewish students in Israeli higher education. The segregated education system for Haredi students focuses on dyadic oral discussions about religious texts. When Haredi men start their way in academia, they move from an oral to a written culture. To understand this complex process, I compared forty argumentative essays and structured interviews of Ultra-Orthodox students. I identified which argumentative patterns recurred or differed across the two contexts. The comparison elicited complex findings: whereas dialectic patterns of weighing supporting and opposing arguments and counterarguments were prominent in both contexts, sweeping generalizations and firm arguments were found mainly in the essays. The similarity of the argumentative patterns in writing and in the interviews may be explained by the stability of argument schemata across different contexts. The findings expand on previous theoretical and empirical findings and demonstrate how the dialectic process of examining different perspectives leads to complex positions. Finally, I present educational implications for teaching argumentation, such as careful activity design and choosing discussion topics that elicit weighing and sophisticated arguments.
“Fingers which mean นิ้ว นิ้วแบบนิ้วมือ”
Authors: Tachaiyaphum Nutthida , Gurney Laura , Daly Nicola 
Published: September 2023

Abstract
This article explores pre-service teachers’ L1 use in Thai Content and Language Integrated Learning (CLIL)
secondary classrooms through the translanguaging frame, which emphasises the use of the whole linguistic and semiotic repertoire
in the classroom to make meaning and construct new knowledge. Teachers may choose to make deliberate use of learners’ linguistic
repertoires in classroom activities to enhance understanding and develop learners’ communicative abilities beyond narrowly defined
language codes. We investigate how pre-service English as a Foreign Language (EFL) teachers employed a translanguaging approach to
model tasks and provide definitions of key terms. We explore the teachers’ beliefs concerning L1 use, drawing attention to the
apparent tension between teachers’ practices and beliefs. The findings indicate that the teachers utilised translanguaging in
different modes, including modeling tasks and translating L2 terms, to address students’ comprehension problems. However, the
teachers expressed mixed beliefs concerning how and when L1 should be used.
Eccentric catastrophes & what to do with them
Authors: Loutrel Nicholas 
Published: September 2023

Abstract
Analytic modeling of gravitational waves (GWs) from inspiraling eccentric binaries poses an interesting mathematical challenge. When constructing analytic waveforms in the frequency domain, one has to contend with the fact that the phase of the Fourier integral in non-monotonic, resulting in a breakdown of the standard stationary phase approximation (SPA). In this work, we study this breakdown within the context of catastrophe theory. We find that the SPA holds in the context of eccentric Keplerian orbits when the Fourier frequency satisfies

f

m
i
n

<
f
<

f

m
a
x

, where

f

m
i
n

/

m
a
x

are integer multiples of the apocenter/pericenter frequencies, respectively. For values outside of this interval, the phase undergoes a fold catastrophe, giving rise to an Airy function approximation of the Fourier integral. Using these two different approximations, we generate a matched asymptotic expansion that approximates generic Fourier integrals of Keplerian motion for bound orbits across all frequency values. This asymptotic expansion is purely analytic and closed-form. We discuss several applications of this investigation and the resulting approximation, specifically: (1) the development and improvement of effective fly-by waveforms for binary black holes, (2) the transition from burst emission in the high eccentricity limit to wave-like emission in the quasi-circular limit, which results in an analogy between eccentric GW bursts and Bose–Einstein condensates, and (3) the calculation of f-mode amplitudes in eccentric binary neutron stars and black hole-neutron star binaries in terms of complex Hansen coefficients. The techniques and approximations developed herein are generic, and will be useful for future studies of GWs from eccentric binaries within the context of post-Newtonian theory.
Charged spherically symmetric black holes in scalar-tensor Gauss–Bonnet gravity
Authors: Capozziello Salvatore , Nashed Gamal G L 
Published: September 2023

Abstract
We derive a novel class of four-dimensional black hole (BH) solutions in Gauss–Bonnet (GB) gravity coupled with a scalar field in presence of Maxwell electrodynamics. In order to derive such solutions, we assume the ansatz

g

t
t

≠

g

r
r

−
1

for metric potentials. Due to the choice of the ansatz of the metric, the Reissner Nordström gauge potential cannot be recovered because of the presence of higher-order terms

which are not allowed to be vanishing. Moreover, the scalar field is not allowed to vanish. If it vanishes, a function of the solution results undefined. Furthermore, it is possible to show that the electric field is of higher-order in the monopole expansion: this fact explicitly comes from the contribution of the scalar field. Therefore, we can conclude that the GB scalar field acts as non-linear electrodynamics creating monopoles, quadrupoles, etc in the metric potentials. We compute the invariants associated with the BHs and show that, when compared to Schwarzschild or Reissner–Nordström space-times, they have a soft singularity. Also, it is possible to demonstrate that these BHs give rise to three horizons in AdS space-time and two horizons in dS space-time. Finally, thermodynamic quantities can be derived and we show that the solution can be stable or unstable depending on a critical value of the temperature.
Pulsed photoemission induced plasma breakdown
Authors: Iqbal Asif , Bentz Brian Z , Zhou Yang , Youngman Kevin , Zhang Peng 
Published: September 2023

Abstract
This article characterises the effects of cathode photoemission leading to electrical discharges in an argon gas. We perform breakdown experiments under pulsed laser illumination of a flat cathode and observe Townsend to glow discharge transitions. The breakdown process is recorded by high-speed imaging, and time-dependent voltage and current across the electrode gap are measured for different reduced electric fields and laser intensities. We employ a 0D transient discharge model to interpret the experimental measurements. The fitted values of transferred photoelectron charge are compared with calculations from a quantum model of photoemission. The breakdown voltage is found to be lower with photoemission than without. When the applied voltage is insufficient for ion-induced secondary electron emission to sustain the plasma, laser driven photoemission can still create a breakdown where a sheath (i.e. a region near the electrode surfaces consisting of positive ions and neutrals) is formed. This photoemission induced plasma persists and decays on a much longer time scale (

∼
10
s

μ

s) than the laser pulse length (

30

ps). The effects of different applied voltages and laser energies on the breakdown voltage and current waveforms are investigated. The discharge model can accurately predict the measured breakdown voltage curves, despite the existence of discrepancy in quantitatively describing the transient discharge current and voltage waveforms.
Pseudogap in BaPb
x
Bi1‒x
O3 (x = 0.7, 0.75 and 1.0)
Authors: Bharath M , Brar Jaskirat , Pant Himanshu , Ali Asif , Bansal Sakshi , Shankar Singh Ravi , Bindu R 
Published: September 2023

Abstract
In this work, we have investigated the crystal and electronic structure of the orthorhombic phase of BaPb
x
Bi

1
−
x

O3 (BPBO) for x = 0.7 (BPBO70), 0.75 (BPBO75) and 1.0 (BPO), using temperature dependent x-ray diffraction measurements, photoemission spectroscopy, and electronic structure calculations. Our results show the importance of particle size and strain in governing superconductivity. Interestingly, the temperature evolution of the structural parameters in the case of BPBO70 is similar to that of BPBO75 but the magnitude of the change is diminished. The BPBO75 and BPO compounds exhibit metallic nature, which is corroborated by the core level studies. The electronic structure calculations in conjunction with the core level studies suggest that oxygen vacancies play an important role for metallicity observed in the end compound. The exponent to the spectral line shape close to the Fermi level suggests the origin of pseudogap to be due to other contributions in addition to disorder in the case of BPBO70 and BPO. The core level studies also show that as one goes from x = 0.70 to 1.0, there occurs chemical potential shift towards the valence band suggesting hole doping. Our results open the venue to further study these compounds as a function of particle size, nature of carriers for its transport behaviour, electronic structure below TC
, composition at the grain boundaries and microscopic origin of pseudogap in the non-superconducting phase. We believe that our results call for a revision of the temperature-doping phase diagram of BPBO to include the pseudogap phase.
Strain engineering on electronic structure, effective mass and charge carrier mobility in monolayer YBr3
Authors: Sun Huaizheng , Wang Linxia , Li Zhixiang , Yan Xiaobing , Zhang Xin , Guo Jianxin , Liu Pan 
Published: September 2023

Abstract
In recent years, two-dimensional materials have significant prospects for applications in nanoelectronic devices due to their unique physical properties. In this paper, the strain effect on the electronic structure, effective mass, and charge carrier mobility of monolayer yttrium bromide (YBr3) is systematically investigated using first-principles calculation based on density functional theory. It is found that the monolayer YBr3 undergoes energy band gap reduction under the increasing compressive strain. The effective mass and charge carrier mobility can be effectively tuned by the applied compressive strain. Under the uniaxial compressive strain along the zigzag direction, the hole effective mass in the zigzag direction (m
ao1_h) can decrease from 1.64 m
0 to 0.45 m
0. In addition, when the uniaxial compressive strain is applied, the electron and hole mobility can up to ∼103 cm2 V−1 s−1. The present investigations emphasize that monolayer YBr3 is expected to be a candidate material for the preparation of new high-performance nanoelectronic devices by strain engineering.
An intelligent feature recognition method of natural gas pipelines based on shapelet and blending fusion model
Authors: Ma Tingxia , Hu Cheng , Wang Lin , Ma Linjie , Mao Zhihao , Xuan Heng 
Published: September 2023

Abstract
Despite the availability of pipeline bending strain detection technologies based on inertial measurement unit, there is a lack of intelligent and efficient methods for accurately identifying pipeline features by bending strain. Therefore, this paper proposes a novel method for identifying features in natural gas pipelines based on shapelet and blending fusion model. Specifically, the shape features of the bending strain data are extracted and transformed by shapelet. Then a blending fusion model with SVM, Decision Tree and Gradient Boosting as base learners and Random Forest as meta-learner is constructed. Finally, the extracted features are fed into the blending fusion model for pipeline feature recognition. The model is trained with bending strain data obtained from a real natural gas pipeline, the results indicate that the recognition accuracy of the proposed method is 97.17%. Compared with other models, the superiority of the proposed model is verified, and it is proved that the proposed method has better accuracy than the existing models (over 1.3%). Overall, the method proposed in this paper can be effectively combined with the in-line inspection system to provide a reference for pipeline companies to carry out pipeline integrity management.
Wide frequency range optical chopper system: an affordable solution using 3D printing and Arduino Uno
Authors: Rana Ankush , Bhatnagar Shivansh , Garg Sagar , Garg Amit 
Published: September 2023

Abstract
We have developed a wide frequency range affordable optical chopper system from 10–550 Hz. It is a self-contained prototype built using 3D design and printing and Arduino UNO. The system consists of six chopper wheels that are 3D designed using open-source software, Blender and printed on FlashForge 3D printer using polylactic acid. Two Arduino Uno’s have been deployed in the present system- One for controlling the rotation speed of the optical choppers and another for frequency measurement of the modulated output. The adoption of open-source approach makes it possible for any undergraduate (UG) or researcher to emulate the present system with possible modifications as per their need for use in their laboratories. It has made optical chopper system which is a widely used instrument, affordable for the UG/research labs costing below USD 50 whereas the cost of the commercially available systems is in the range of USD 800–1000 and that too with a matching performance and adaptability.
Particle simulations for inquiry-based teaching of polymer shape and entropic elasticity using computational thinking
Authors: Kraska Thomas 
Published: September 2023

Abstract
An inquiry-based approach is proposed that allows students to develop and understand computer codes for simulations at the particle level. Computational thinking is employed as a low-threshold approach for students without programming experience. The resulting computer code cores are concise and traceable. Here, the topic of the simulations concerns polymer molecules. A special property of polymers, coiling, and the related entropic elasticity is suitable for the setup of a simulation in class. Students at the upper secondary level were introduced into the topic by an activity. This was a stochastic game serving as a basis to for the development of the corresponding algorithm. Once students are involved in the development of the code, they can meaningfully investigate the model by running the program, changing its parameters, or altering the code. With these simulations, students can prove wrong the early belief that polymer molecules exhibit a stretched chain structure. Furthermore, the confinement of the system leads to a decrease in entropy, which in turn results in a force acting on the walls that can be elaborated comprehensively by students through such simulations.
Verification experiment of the coefficient of static and kinetic friction utilizing a mobile application
Authors: Bug-os Mary Allein Antoenette C , Marte Sherwin J , Pili Unofre B 
Published: September 2023

Abstract
This study is conducted to determine the coefficient of static and kinetic friction. The average angle of inclination measured for the coefficient of static friction is used as the angle of inclination of the plane when measuring the acceleration of the cardboard on wood as a variable in determining the coefficient of kinetic friction. Importantly, it verifies that the coefficient of static friction is greater than the coefficient of kinetic friction by utilizing the Phyphox application.
Example activity: how to determine the center of mass of a body if the center of mass is outside the body?
Authors: Şahin Esin 
Published: September 2023

Abstract
The centre of mass (CM) is a key concept that facilitates the understanding of various physics topics and the solution of problems. This study’s aim is to present an activity for students to experimentally determine the location of the CM of bodies with a CM outside the body. Thus, an example activity will be presented that will allow students to understand the situation where the CM is outside the body, to find the CM of bodies, and to generate new examples with a CM outside the body themselves. For at-rest bodies, the common experimental technique for finding the CM of the body consists of drawing two vertical gravity lines through the body, and the CM is at the intersection of these lines. In this research, this technique is adapted to cases where the CM is outside the body.
Improvement of critical current properties and irreversibility lines by metal substitution in Ca-free Hg-based double-layered cuprates
Authors: Ninomiya Hiroki , Kawashima Kenji , Ishida Shigeyuki , Ogino Hiraku , Fujihisa Hiroshi , Gotoh Yoshito , Yoshida Yoshiyuki , Iyo Akira , Eisaki Hiroshi 
Published: September 2023

Abstract
Ca-free Hg-based double-layered cuprates with Sr ions separating the two CuO2 planes, Hg(Sr Ba)2SrCu2O
y
and its metal-substituted analogue of (Hg, M)(Sr Ba)2SrCu2O
y
(

M
=
Mo

, Re, and Pb), were successfully synthesized under high pressure. These novel materials exhibit bulk superconductivity at a critical temperature above 100 K. The superconducting properties, including critical current density

(

J
c

)

and irreversibility field

(

B
irr

)

, were investigated through magnetic hysteresis loop measurements. Our results revealed that the M substitution with

M
=
Mo

and Re improves the J
c and B
irr properties, which is likely associated with a decrease in the thickness of the blocking layer. Furthermore, a comparison of the irreversibility lines between Ca-free and representative Ca-containing Hg-based compounds highlighted that the replacement of Ca by Sr in the CuO2 planes does not significantly impact the temperature dependence of B
irr. Notably, we found that (Hg, Re)Sr2SrCu2O
y
has an irreversibility line as high as that of the reported triple-layered (Hg, Re)Sr2Ca2Cu3O
y
cuprate.
Dendritic flux avalanches in superconducting hybrid structures
Authors: Wasserman M , Shaulov A , Sharoni A , Yeshurun Y 
Published: September 2023

Abstract
Magneto-optical imaging was employed to study dendritic flux avalanches in metal/superconductor and superconductor/superconductor hybrid structures over an extended range of magnetic field ramping rates. Our results in Cu/NbN show that the previously reported suppression of dendritic flux avalanches in metal coated superconducting films is limited to low ramping rates; as the ramping rate increases, the metal coating becomes less and less effective. A more complex behavior is exhibited in superconductor/superconductor hybrid structures. Our measurement in NbN partially coated with Nb, reveal three distinctive types of dendritic avalanches: those propagating in only one layer, either as regular dendrites in the uncoated NbN or as surface dendrites in the Nb layer, and hybrid dendrites that propagate in both the Nb and NbN layers simultaneously. These three types of dendrites are distinguished by their morphology, temperature dependence and instability threshold field. The overall stability of the hybrid structure significantly exceeds that of its weak component.
Bipartite entanglement via distance between the states in a one dimensional spin 1/2 dimer copper acetate monohydrate
Authors: Athira S , L L Silva Saulo , Nag Probal , Lakshmi Sushma , Kumar C Sharath , Prasad Panda Debendra , Das Sayan , Rajput Sarita , P Alex Andrews , Sundaresan A , Reddy Vennapusa Sivaranjana , Maitra T , Jaiswal-Nagar D 
Published: September 2023

Abstract
In this paper, we used a theoretical measure known as distance between the states,

, to determine the bipartite entanglement of a one dimensional magnetic dimer system. The calculation was compared with the well-known entanglement measure, concurrence, and found to be the same.

was, then, expressed in terms of two thermodynamic quantities, namely, magnetic susceptibility and specific heat. Experimental verification of temperature variation of the bipartite entanglement measure in terms of magnetic susceptibility and specific heat was done on single crystals of copper acetate-an excellent one dimensional dimer system. The results showed the existence of bipartite entanglement till temperatures as high as room temperature! Large sized single crystals of copper acetate were grown by a new evaporation technique and characterised by thermogravimetric analysis, IR and Raman spectroscopy measurements. Density functional theory calculations were done to calculate the delocalisation index which showed much lower values of

δ
(

C
u
,
C
u

)

than other bonds, implying that the probability of direct Cu–Cu exchange in copper acetate is very small. Band structure calculations revealed the presence of flat bands at the Fermi level implying very weak intermolecular interactions in copper acetate.
Families of bosonic suppression laws beyond the permutation symmetry principle
Authors: Bezerra M E O , Shchesnovich V S 
Published: September 2023

Abstract
Exact cancellation of quantum amplitudes in multiphoton interferences with Fock states at the input, the so-called suppression or zero transmission laws generalizing the Hong–Ou–Mandel dip, are useful tools in quantum information and computation. It was recently suggested that all bosonic suppression laws follow from a common permutation symmetry both in the input quantum state and in the unitary matrix of the interferometer. By using the recurrence relations for the interference of Fock states, we find a wealth of suppression laws on the beamsplitter and tritter interferometers that do not follow from the permutation symmetry principle. In general, our results point on the existence of whole families of suppression laws with only a fraction of them being accounted for by the permutation symmetry principle, suggested as the general principle behind all the suppression laws.