bluuebunny/crossref_metadata_2025_split huggingface dataset:
Constraining the overcontact phase in massive binary evolution
Authors: Vrancken Jasmine , Abdul-Masih Michael , Escorza Ana , Menon Athira , Mahy Laurent , Marchant Pablo 
Published: October 2024

Context. Binary systems play a crucial role in massive star evolution. Systems composed of B-type and O-type stars are of particular interest due to their potential to lead to very energetic phenomena or the merging of exotic compact objects.
Aims. We aim to determine the orbital period variations of a sample of B+B and O+B massive overcontact binaries, with the primary objectives of characterizing the evolutionary timescales of these systems and addressing the existing discrepancy between observational data and theoretical predictions derived from population synthesis models.
Methods. We used PERIOD04 to analyze archival photometric data going back a century for a sample of seven binary systems to measure their orbital periods. We then determine the period variations using a linear fit.
Results. We find that the period variation timescales of five truly overcontact binary systems align with the nuclear timescale, in agreement with previous findings for more massive overcontact binaries. Additionally, we noticed a clear distinction between the five systems that had been unambiguously classified as overcontact systems and both SV Cen and VFTS 066, which seem to be evolving on thermal timescales and might be misclassified as overcontact systems.
Conclusions. In the case of the five overcontact binaries, our results indicate a noticeable mismatch between the observational data and the theoretical predictions derived from population synthesis models. Furthermore, our results suggest that additional physical mechanisms must be investigated to compare the observed variations more thoroughly with theoretical predictions.
Rotation state, colors, and albedo of the mission-accessible tiny near-Earth asteroid 2001 QJ142
Authors: Beniyama Jin , Sergeyev Alexey V. , Tholen David J. , Micheli Marco 
Published: October 2024

Context. Characterizing mission-accessible asteroids using telescopic observations is fundamental for target-selection and planning for spacecraft missions. Near-Earth asteroids on Earth-like orbits are of particular importance for applications such as asteroid mining. Aims. 2001 QJ142 is a tiny (D ≤ 100 m) near-Earth asteroid on an Earth-like orbit with a semimajor axis of 1.06 au, orbital eccentricity of 0.09, and orbital inclination of 3.10°. We aim to characterize 2001 QJ142 using ground-based observations with future spacecraft missions in mind.
Methods. We performed visible multicolor photometry of 2001 QJ142 using the TriCCS on the Seimei 3.8 m telescope in February 2024. We also revisited the images taken with the Suprime-Cam on the Subaru 8.2 m telescope in August 2012.
Results. Visible color indices of 2001 QJ142 indicate that 2001 QJ142 is a C- or X-complex asteroid. We detect a possible fast rotation with a period of about 10 min, which is consistent with a previous report. The geometric albedo of 2001 QJ142 is derived to be about 0.3 from a slope of its photometric phase curve, which is consistent with an albedo derived from thermal observations with updated physical quantities. A straightforward interpretation is that 2001 QJ142 is either an E- or M-type asteroid, although surface properties of such tiny fast-rotating asteroids are not well understood.
Conclusions. We infer that 2001 QJ142 is a fast-rotating mission-accessible E- or M-type near-Earth asteroid. More characterizations of tiny asteroids are particularly important for a deeper understanding of their nature.
Implications of scattering for CMB foreground emission modelling
Authors: Li Jia-Rui , Delabrouille Jacques , Cai Yi-Fu , Zhang Dongdong 
Published: October 2024

Context. The extreme precision and accuracy of forthcoming observations of the cosmic microwave background (CMB) temperature and polarisation anisotropies, aiming to detect the tiny signatures of primordial gravitational waves or of light relic particles beyond the standard three light neutrinos, requires commensurate precision in the modelling of foreground Galactic emission that contaminates CMB observations.
Aims. We evaluate the impact of second-order effects in Galactic foreground emission due to Thomson scattering off interstellar free electrons and to Rayleigh scattering off interstellar dust particles.
Methods. We used existing sky survey data and models of the distribution of free electrons and dust within the Milky Way to estimate the amplitude and power spectra of the emission originating from radiation scattered either by free electrons or by dust grains at CMB frequencies.
Results. Both processes generate corrections to the total emission that are small compared to direct emission and are small enough not to pose problems for current-generation observations.
Conclusions. However, B modes generated by Thomson scattering of incoming radiation off interstellar free electrons at CMB frequencies are within an order of magnitude compared to the sensitivity of the most advanced forthcoming CMB telescopes, and might require more precise evaluation in the future.
Nuclear astrophysics studies with the Trojan Horse Method
Authors: Tumino Aurora 
Published: October 2024

Our understanding of how stars evolve relies on two critical factors: energy production and chemical evolution. These factors are influenced by thermonuclear reactions. However, directly measuring these reactions in a laboratory setting can be challenging due to small reaction cross sections or the need for radioactive targets that are impractical to handle.
To overcome these challenges, scientists have developed indirect techniques. One such method is the Trojan Horse Method (THM), which utilizes transfer reactions to determine cross sections of reactions relevant to stellar burning processes. In this paper, we will delve into the features of the Trojan Horse Method, its application in nuclear astrophysics, and provide examples of THM measurements.
Synchronous Spontaneous Cochlear Emissions in Neonates and Adults: A Comparative Study
Authors: Eranna Prajwal Kumar , Winston Jim Saroj , Hegde Sinchana , Prasad Ishika , Goyal Swati , Rachana Dhananjay 
Published: October 2024

Abstract
Objectives The primary objective of the current study was to characterize synchronous spontaneous otoacoustic emissions (SSOAEs) in adults and neonates. It was also interesting to compare the prevalence, frequency, and amplitudes of SSOAE in neonates and adults.
Materials and Method A prospective comparative study design was employed in which synchronized SSOAEs were recorded binaurally from 92 neonates and 100 adults using an Echoport ILO 292 OAE analyzer. The recorded spectrum was analyzed for the number, amplitude, spectral distribution, and prevalence of SSOAEs.
Statistical Analysis The data were subjected to descriptive and inferential statistics using JASP version 0.16.1.0. A chi-squared test was used to compare the prevalence of SSOAEs in the test population. The Shapiro–Wilk test for normality was administered to check the data distribution. The nonparametric Mann–Whitney U test and parametric independent t-test were used to compare the amplitude and frequency data.
Results The findings revealed a higher prevalence of SSOAEs in neonates (42.8%) compared with adults (18%). The analysis also showed that the multiple-frequency SSOAEs were more prevalent than single-frequency SSOAEs in adults and neonates. The percentage of SSOAE occurrence was highest in the 2- to 3-kHz bin for adults, whereas in neonates, most SSOAEs occurred between 3 and 4 kHz. The results showed that the SSOAE amplitude across frequency bands was significantly higher in newborns compared with adults in all the frequency bins.
Conclusion The present study revealed a lesser prevalence of SSOAE in adults and neonates than in earlier reports. However, no difference in the spectral characteristics was observed.
Sex Disparity in the Canal-to-Body Ratio of the Cervical Spine Indicating the Prevalence of Cervical Myelopathy: A Cross-Sectional Study
Authors: Bisanal Girish Mallikarjun , Manakkal Meethal Jaseemudheen 
Published: October 2024

AbstractBackground A narrow spinal canal and large vertebral body have been thought to be risk factors for cervical myelopathy. It is generally known that males are more likely to develop cervical myelopathy than females. Thus, sex is also a factor that contributes to myelopathy. The anteroposterior (AP) diameter of the cervical spinal canal is well-established as a primary factor of myelopathy.Objective To investigate the sex discrepancy in the canal-to-body ratio of the cervical spine on magnetic resonance imaging (MRI).Materials and Methods This cross-sectional study included 59 males and 59 females, all aged between 20 and 40 years. Morphological parameters, including height, AP diameter of the vertebral body, and AP diameter of the spinal canal, were measured on sagittal T2-weighted MRI cervical spine images for each participant. The canal-to-body ratio, obtained by dividing the spinal canal's AP diameter by the vertebral body's AP diameter, served as a key metric. The average canal-to-body ratio values compared between male and female groups at each spinal level (C3–C7) elucidate potential gender-related differences.Results The height and the AP diameter of the vertebral body were larger in males than in females throughout C3–C7. There was a statistically significant difference between males and females. The AP diameter of the spinal canal was similar for both genders, with no statistically significant difference between them. The mean canal-to-body ratio was significantly larger in females than in males, with a statistically significant difference between males and females at each spinal level.Conclusion Females had a larger canal-to-body ratio, and men had a significantly lower one. The canal-to-body ratio method was thought to be superior to the absolute value of the AP diameter of the spinal canal for the diagnosis of canal stenosis.
Exploring Hand Function and Performance Disparities among Women in Varied Occupational Spheres: A Preliminary Report
Authors: Damodar Smitha , Bhat Shivarama , Natarajan Manikandan 
Published: October 2024

Abstract
Introduction The hand represents the most interactive aspect of the upper extremity. Previous research indicates that young individuals and females typically exhibit superior hand dexterity. Limited literature exists regarding the impact of occupations that require dexterous activities on hand function, potentially influencing the preservation of dexterity as individuals age.
Objectives This study sought to assess the hand dexterity, grip strength, and pinch strength of female beedi rollers involved in intricate tasks with those of female nonbeedi workers across different age brackets.
Materials and Methods This study in a community setting included a sample of 664 female participants, evenly distributed between two groups. The participants were further categorized into age brackets: 25 to 34, 35 to 44, 45 to 54, and 55 to 64 years. Dexterity, grip strength, and pinch strength were assessed using Purdue Pegboard, Jamar hand dynamometer, and pinch meter, respectively.
Statistical Analysis Descriptive statistics with mean and standard deviation; analysis of variance and post hoc Bonferroni test were done for multiple comparisons.
Results Manual dexterity scores, grip strength, and pinch strength were evaluated and recorded for all age groups among both beedi rollers and nonbeedi workers. Manual dexterity scores were higher in beedi rollers than nonbeedi workers for all age groups, with statistically significant differences (p < 0.05). Similarly, grip strength and pinch strength scores were significantly greater in beedi rollers across all age groups (p < 0.05), except for pinch strength in the nondominant hands of participants aged 35 to 44 and 45 to 54 years of nonbeedi workers, where the differences were not statistically significant (p > 0.05).
Conclusion Across all age brackets, beedi rollers exhibited superior manual dexterity, grip strength, and pinch strength compared with nonbeedi rollers. The elevated dexterity scores observed in beedi rollers aged 25 years and older suggest that occupations requiring dexterity may positively influence and maintain hand performance as individuals age, thus highlighting the potential benefits of dexterity-based occupations on aging.
A theoretical study of thermal properties and structural evolution in binary carbonates phase change material: Machine learning-enhanced sampling strategy
Authors: Tian Heqing , Zhang Wenguang , Guo Chaxiu 
Published: October 2024

Thermal energy storage and utilization has been widely concerned due to the intermittency, renewability, and economy of renewable energy. In this paper, the potential energy function of binary Na2CO3–K2CO3 salt was first constructed using the Deep Potential GENerator (DPGEN) enhanced sampling method. Deep potential molecular dynamics simulations were performed to calculate the thermal properties and structural evolution of binary carbonates. The results show that as the temperature increases from 1073 to 1273 K, the viscosity and thermal conductivity decrease from 5.011 mPa s and 0.502 W/(m K) to 2.526 mPa s and 0.481 W/(m K), respectively. The decrease in viscosity is related to the distance and interaction between the molten salt ions. In addition, the diffusion coefficients, energy barriers, ionic radius, angular distribution function, and coordination number of molten salt were calculated and analyzed. The CO32− exhibits a stable planar triangular structure. The ionic radius of Na+ is smaller than that of K+, which makes Na+ suffer less spatial hindrance during motion and has a higher diffusion coefficient. The energy barriers that Na+ needs to overcome to escape the Coulomb force is greater than that of K+ ions, so molten salt containing Na+ may possess greater heat storage potential. We believe that the potential function constructed with DPGEN enhanced sampling strategy can provide more convincing results for predicting the thermal properties of molten salts. This paper aims to provide a technical route to develop the novel complex molten salt phase change material for thermal energy storage.
Vibronic coupling in the energetically six lowest electronic states of oxirane radical cation
Authors: Rani Vadala Jhansi , Kanakati Arun Kumar , Mahapatra S. 
Published: October 2024

Multi-dimensional quantum mechanical simulations are carried out to understand the multi-state and multi-mode vibronic interactions in the first six low-lying viz., X̃2B1, Ã2A1, B̃2B2, C̃2A2, D̃2A1, and Ẽ2B1 electronic states of c-C2H4O·+. Vibronic coupling theory is applied to study interactions among electronic states using symmetry selection rules. A model 6 × 6 diabatic electronic Hamiltonian is constructed. The parameters of the diabatic Hamiltonian are estimated by performing extensive ab initio electronic structure calculations, using the EOM-IP-CCSD method. The nuclear dynamics calculations are performed with both time-independent and time-dependent quantum mechanical methods. The calculated vibronic structures of six electronic states are found to be in excellent agreement with the available experimental findings. Progressions found in the theoretical spectrum are assigned in terms of vibrational modes. It is found that extremely strong vibronic interactions among the X̃2B1–Ã2A1, B̃2B2–C̃2A2, and D̃2A1–Ẽ2B1 electronic states results into highly overlapping vibronic bands due to multiple multi-state conical intersections. The impact of associated nonadiabatic effects on the vibronic structure and dynamics of the mentioned electronic states is examined at length. Interesting comparison is made with the results obtained for the isomeric acetaldehyde radical cation.
Solar spectral response of photochromic YHO films
Authors: Hansen Per-Anders , Baba Elbruz Murat 
Published: October 2024

Photochromic yttrium oxyhydride, YHO, has excellent properties as a responsive solar control material, in particular due to its color-neutral darkening. In this work, we have investigated YHO’s spectral response to the solar AM 1.5 spectrum to evaluate how the total photon activation flux changes as a function of thickness and wavelength. The calculations are based on ellipsometry measurements in the 240–2000 nm range. Our results show that the UV light absorption saturates at around 400 nm thick film, while blue light (&gt;400 nm) continues to provide photoactivation well beyond 1 μm thickness. Understanding the spectral response and absorption per unit time of activating photons as a function of material thickness is important for evaluating the material or coating for applications.
Study on the parameter identification of lithium-ion battery model under high-rate pulse discharge conditions
Authors: Hu Taizhuang , Yang Zenghui , Zhang Huibo , Zhang Zicheng 
Published: October 2024

With the rapid development of the new energy sector and lithium-ion (Li-ion) battery technologies, using Li-ion batteries with high energy density and high discharge rate to form the primary energy subsystem can further improve the compactness and miniaturization level of pulsed power systems. In traditional electric power systems, Li-ion batteries normally operate under the discharge condition of low current and long time. However, as the main power source of pulsed power systems, it is required that Li-ion batteries should have the capability for high-rate pulse discharge. To ensure the safe and reliable operation of the battery energy storage system, it is necessary to conduct the parameter identification of the Li-ion battery model to establish an accurate pulse discharge model under such working conditions. This paper focuses on the discharge characteristics of a cylindrical high-rate single Li-ion battery with a capacity of 3 Ah. At a 20 C rate, the discharge data were obtained when the pulse repetition frequency was 10 Hz and the duty cycle was 90%. By using the mathematical expressions of the Thevenin equivalent circuit model, the recursive relationship of the circuit parameters was obtained, and the parameter identification of the battery model was conducted based on the experimental data by using the genetic algorithm. The results show that the fitting accuracy of the parameter identification reaches 0.9995, indicating the high precision of the model for the Li-ion battery. This work provides a significant reference for the modeling and parameter identification of Li-ion batteries under high-rate pulse discharge conditions.
Structure optimal design of 500 kV dry-type air-core shunt reactor based on response surface method
Authors: Zhu Yanjing , Kou Jiajun , Zhang Zhiyu , Liu Gang , Hu Wei , Xie Liang , Zhou Guangdong 
Published: October 2024

The hotspot temperature of the reactor is one of the important indices in reactor design, and the appropriate hotspot value can ensure that the reactor will not overheat failure and threaten the safety of the power system. In this paper, the temperature field simulation model of a 500 kV dry-type air-core shunt reactor is established, and the hotspot temperature of the reactor is obtained by COMSOL software. Then, the radial basis function response surface function is used to construct the response surface function of the hotspot temperature and its related variables, and the applicability of the response surface function is tested to analyze the rationality and accuracy of the response surface function. Finally, the optimal solution of the response surface function under the coordination of variables and related constraints is obtained by using the constrained simulated annealing algorithm. The results show that the hotspot temperature of the reactor envelope winding decreases obviously after optimization.
Update of the BIPM comparison BIPM.RI(II)-K1.Ga-67 of activity measurements of the radionuclide 67Ga to include the 2023 result of the CMI (Czechia)
Authors: Michotte Carine , Courte Sammy , Coulon Romain , Nonis Manuel , Sochorová J , Auerbach P 
Published: October 2024

Main text
Since 1978, 10 laboratories have submitted 18 samples of 67Ga to the International Reference System (SIR) for activity comparison at the Bureau International des Poids et Mesures (BIPM), with comparison identifier BIPM.RI(II)-K1.Ga-67. Recently, the CMI (Czechia) participated in the comparison and the key comparison reference value (KCRV) has been fully revised. The degrees of equivalence between each equivalent activity measured in the SIR and the updated KCRV have been calculated and the results are given in the form of a table. A graphical representation is also given.
To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/.
The final report has been peer-reviewed and approved for publication by the CCRI, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
High contrast computational imaging with vortex phase diversity
Authors: Singh Mahendra Pratap , Pandey Neeraj , Khare Kedar 
Published: October 2024

Abstract
Optical imaging systems employing spatially incoherent illumination are widely used in routine imaging applications like photography and bright-field microscopy. We describe an incoherent computational imaging system that uses an open aperture as well as a vortex phase aperture for recording the same scene. The two raw recorded images provide a diversity of information that can be effectively combined using the generalized Wiener filter. For the specific choice of aperture functions used here, the two corresponding generalized Wiener filters have nearly opposing polarity. This property leads to an effective computational point spread function (PSF) whose central lobe is 0.6 times smaller compared to the diffraction-limited PSF and has a super-oscillatory character with side-lobes. The resultant computational imaging system provides images with significantly improved contrast. While our methodology requires two image records, the enhanced PSF with super-oscillatory character is obtained by employing bulk off-the-shelf optical elements instead of sub-wavelength structured masks. The vortex phase diversity concept along with computational image reconstructions are illustrated with both simulation and experimental data. The proposed imaging methodology may be used to improve imaging performance for wide ranging imaging systems without changing their form factor.
Review on chemical mechanical polishing for atomic surfaces using advanced rare earth abrasives
Authors: Chen Xiangyan , Zhang Zhenyu , Zhao Feng , Luo Hao , Wang Jianmei , Meng Fanning , Zhou Hongxiu , Zhuang Xuye , Li Guo 
Published: October 2024

Abstract
During the past decades, high-performance devices and setups have been widely used in the fields of precision optics, semiconductors, microelectronics, biomedicine, optoelectronics and aerospace. It is a challenge to achieve ultralow surface roughness free of damages. Due to the unique physicochemical properties of rare earths, ceria has garnered great progresses for atomic surfaces induced by chemical mechanical polishing. Compared with conventional mechanical removal by alumina and silica, rare earth abrasives achieve selective material removal on surface via their special chemical activity, without introducing microscopic scratches and defects. Nevertheless, polishing performance of rare earth abrasives depends on series of factors, e.g. size of abrasive particles, microscale topological structure, configuration of chemical slurry, auxiliary energy fields etc. As a result, it is significant to conduct a comprehensive review to understand state-of-the-art polishing technologies. This review summarizes the effect of polishing slurries composed of different rare earth abrasives on polishing performance under different conditions. Additionally, various energy-assisted polishing strategies are discussed using diverse kinds of rare earth abrasives for distinct polishing forms. Finally, future directions of polishing on rare earth abrasives are addressed.