bluuebunny/crossref_metadata_2025_split huggingface dataset:
Some features of frequency identification of axial load in beam specimens
Authors: Азаров А.А. , Попов А.Л. , Челюбеев Д.А. 
Published: January 2024

Оценка усилий и жёсткости соединений имеет важное значение для контроля стержневых элементов. Существующие методы оценки подразделяются на статические и динамические. В работе рассмотрена методика динамической оценки продольного усилия в закреплённом стержне по спектру его изгибных колебаний путём сравнения экспериментально зарегистрированных частот колебаний с теоретическим спектром частот, полученным на основе модели балки Тимошенко. Для согласования результатов по теоретической модели с набором экспериментальных частот использован алгоритм basin-hopping. Выявлена особенность разнонаправленного изменения собственных частот изгибных колебаний при растяжении стержня в области слабо нелинейной зависимости напряжения от деформации.
The evaluation of forces and joint stiffness is important for the inspection of rod elements. The existing evaluation methods are divided into static and dynamic methods. The paper considers a method of dynamic evaluation of longitudinal force in a fixed rod based on its bending vibration spectrum by comparing the experimentally recorded vibration frequencies with the theoretical frequency spectrum obtained from the Timoshenko beam model. The basin-hopping algorithm is used to harmonize the results of the theoretical model with the set of experimental frequencies. The peculiarity of multidirectional variation of the natural frequencies of bending vibrations during rod stretching in the region of weakly nonlinear stress-deformation dependence is revealed.
On determining the position of the neutral line in the case of extremely elastic bending of multilayer physically nonlinear concrete rods
Authors: Немировский Ю.В. , Тихонов С.В. 
Published: January 2024

В данной работе рассматривается задача изгиба многослойного стержня поперечными нагрузками при наличии зон упругого и нелинейно-неупругого деформирования, получены соотношения для определения границы раздела упругой и нелинейно-неупругой областей деформирования стержня. Полученные численные расчеты для случаев совпадения и не совпадения нейтральной линиии с осью стержня. Приведены чиссленные расчеты предельных нагрузок: первой (деформация достигает значения предельной неупругой) и второй (деформация достигает значения деформации предразрушения).
This paper considers the problem of bending a multilayer rod under transverse loads in the presence of zones of elastic and nonlinear-inelastic deformation, and relations are obtained to determine the interface between the elastic and nonlinear-inelastic deformation regions of the rod. The resulting numerical calculations for cases of coincidence and non-coincidence of the neutral line with the axis of the rod. Numerical calculations of the limiting loads are presented: the first (the deformation reaches the limiting inelastic value) and the second (the deformation reaches the value of the pre-fracture strain).
An Episode of Occultation Events in Gaia21bcv
Authors: Hodapp Klaus W. , Gaidos Eric , Kenworthy Matthew A. , Tucker Michael , Shappee Benjamin J. , Payne Anna V. , Do Aaron 
Published: January 2024

Abstract
A previously unremarkable star near the Canis Major OB1/R1 association underwent an episode of multiple deep brightness minima. Light curves based on archival Gaia, Zwicky Transient Facility (ZTF), and NEOWISE data and additional observations from the Las Cumbres Observatory and UKIRT show that the star was not variable prior to 2019 August 18 (MJD 58700), and on that date started showing brightness dips of up to 3 mag in the Gaia G and ZTF r bandpasses. After MJD 59500, ≈800 days after the onset of these dipping events, the star returned to its previous brightness, and no significant dipping events have been recorded since. Compared to the stable phase, NEOWISE IR photometry in the W1 and W2 bands indicates a generally redder color, and both decreases and increases in brightness at different times during the dipping episode. The spectrum of Gaia21bcv taken after the end of the dipping episode shows several neutral and ionized metal absorption lines, including Li, indicating a spectral type of ≈K5. Variable emission from [O i] was observed. The Hα absorption in Gaia21bcv is too faint and irregular for this spectral type, indicating that the line is partly filled in by variable emission, a signature of weak episodic accretion. Gaia21bcv lies above the zero-age main sequence, but is much fainter than typical R CrB stars. We interpret the light curve of Gaia21bcv as being similar to the occultation events in ϵ Aurigae, i.e., occultation by a disk around a companion object orbiting the primary star.
Investigating the Atmospheric Mass Loss of the Kepler-105 Planets Straddling the Radius Gap
Authors: Householder Aaron , Weiss Lauren M. , Owen James E. , Isaacson Howard , Howard Andrew W. , Fabrycky Daniel , Rogers Leslie A. , Schlichting Hilke E. , Fulton Benjamin J. , Petigura Erik A. , Giacalone Steven , Murphy Joseph M. Akana , Beard Corey , Chontos Ashley , Dai Fei , Van Zandt Judah , Lubin Jack , Rice Malena , Polanski Alex S. , Dalba Paul , Blunt Sarah , Turtelboom Emma V. , Rubenzahl Ryan , Brinkman Casey 
Published: January 2024

Abstract
An intriguing pattern among exoplanets is the lack of detected planets between approximately 1.5 R
⊕ and 2.0 R
⊕. One proposed explanation for this “radius gap” is the photoevaporation of planetary atmospheres, a theory that can be tested by studying individual planetary systems. Kepler-105 is an ideal system for such testing due to the ordering and sizes of its planets. Kepler-105 is a Sun-like star that hosts two planets straddling the radius gap in a rare architecture with the larger planet closer to the host star (R

b
= 2.53 ± 0.07 R
⊕, P

b
= 5.41 days, R

c
= 1.44 ± 0.04 R
⊕, P

c
= 7.13 days). If photoevaporation sculpted the atmospheres of these planets, then Kepler-105b would need to be much more massive than Kepler-105c to retain its atmosphere, given its closer proximity to the host star. To test this hypothesis, we simultaneously analyzed radial velocities and transit-timing variations of the Kepler-105 system, measuring disparate masses of M

b
= 10.8 ± 2.3 M
⊕ (ρ

b
= 3.68 ± 0.84 g cm−3) and M

c
= 5.6 ± 1.2 M
⊕ (ρ

c
= 10.4 ± 2.39 g cm−3). Based on these masses, the difference in gas envelope content of the Kepler-105 planets could be entirely due to photoevaporation (in 76% of scenarios), although other mechanisms like core-powered mass loss could have played a role for some planet albedos.
Compact Symmetric Objects. I. Toward a Comprehensive Bona Fide Catalog
Authors: Kiehlmann S. , Lister M. L. , Readhead A. C. S , Liodakis I. , O’Neill Sandra , Pearson T. J. , Sheldahl Evan , Siemiginowska Aneta , Tassis K. , Taylor G. B. , Wilkinson P. N. 
Published: January 2024

Abstract
Compact symmetric objects (CSOs) are jetted active galactic nuclei (AGN) with overall projected size <1 kpc. The classification was introduced to distinguish these objects from the majority of compact jetted AGN in centimeter-wavelength very long baseline interferometry observations, where the observed emission is relativistically boosted toward the observer. The original classification criteria for CSOs were (i) evidence of emission on both sides of the center of activity and (ii) overall size <1 kpc. However, some relativistically boosted objects with jet axes close to the line of sight appear symmetric and have been misclassified as CSOs, thereby undermining the CSO classification. This is because two essential CSO properties, pointed out in the original papers, have been neglected: (iii) low variability and (iv) low apparent speeds along the jets. As a first step toward creating a comprehensive catalog of “bona fide” CSOs, we identify 79 bona fide CSOs, including 15 objects claimed as confirmed CSOs here for the first time, that match the CSO selection criteria. This sample of bona fide CSOs can be used for astrophysical studies of CSOs without contamination by misclassified CSOs. We show that the fraction of CSOs in complete flux density limited AGN samples with S
5GHz > 700 mJy is between (6.8 ± 1.6)% and (8.5 ± 1.8)%.
Compact Symmetric Objects. II. Confirmation of a Distinct Population of High-luminosity Jetted Active Galaxies
Authors: Kiehlmann S. , Readhead A. C. S. , O’Neill S. , Wilkinson P. N. , Lister M. L. , Liodakis I. , Bruzewski S. , Pavlidou V. , Pearson T. J. , Sheldahl E. , Siemiginowska A. , Tassis K. , Taylor G. B. 
Published: January 2024

Abstract
Compact symmetric objects (CSOs) are compact (<1 kpc), jetted active galactic nuclei (AGN), whose jet axes are not aligned close to the line of sight, and whose observed emission is not predominantly relativistically boosted toward us. Two classes of CSOs have previously been identified: approximately one-fifth are edge dimmed and the rest are edge brightened. We designate these as CSO 1s and 2s, respectively. This paper focuses almost exclusively on CSO 2s. Using complete samples of CSO 2s we present three independent lines of evidence, based on their relative numbers, redshift distributions, and size distributions, which show conclusively that the vast majority (>99%) of CSO 2s do not evolve into larger-scale radio sources. These CSO 2s belong to a distinct population of jetted AGN, which should be characterized as “short-lived,” as opposed to “young,” compared to the classes of larger jetted AGN. We show that there is a sharp upper cutoff in the CSO 2 size distribution at ≈500 pc. The distinct differences between most CSO 2s and other jetted AGN provides a crucial new time domain window on the formation and evolution of relativistic jets in AGN and the supermassive black holes that drive them.
A Uniform Analysis of Debris Disks with the Gemini Planet Imager. I. An Empirical Search for Perturbations from Planetary Companions in Polarized Light Images
Authors: Crotts Katie A. , Matthews Brenda C. , Duchêne Gaspard , Esposito Thomas M. , Dong Ruobing , Hom Justin , Oppenheimer Rebecca , Rice Malena , Wolff Schuyler G. , Chen Christine H. , Do Ó Clarissa R. , Kalas Paul , Lewis Briley L. , Weinberger Alycia J. , Wilner David J. , Ammons Mark , Arriaga Pauline , De Rosa Robert J. , Debes John H. , Fitzgerald Michael P. , Gonzales Eileen C. , Hines Dean C. , Hinkley Sasha , Hughes A. Meredith , Kolokolova Ludmilla , Lee Eve J. , López Ronald A. , Macintosh Bruce , Mazoyer Johan , Metchev Stanimir , Millar-Blanchaer Maxwell A. , Nielsen Eric L. , Patience Jenny , Perrin Marshall D. , Pueyo Laurent , Rantakyrö Fredrik T. , Ren Bin B. , Schneider Glenn , Soummer Remi , Stark Christopher C. 
Published: January 2024

Abstract
The Gemini Planet Imager (GPI) has excelled in imaging debris disks in the near-infrared. The GPI Exoplanet Survey imaged 24 debris disks in polarized H-band light, while other programs observed half of these disks in polarized J and/or K1 bands. Using these data, we present a uniform analysis of the morphology of each disk to find asymmetries suggestive of perturbations, particularly those due to planet–disk interactions. The multiwavelength surface brightness, disk color, and geometry permit the identification of any asymmetries such as warps or disk offsets from the central star. We find that 19 of the disks in this sample exhibit asymmetries in surface brightness, disk color, disk geometry, or a combination of the three, suggesting that for this sample, perturbations, as seen in scattered light, are common. The relationship between these perturbations and potential planets in the system is discussed. We also explore correlations among stellar temperatures, ages, disk properties, and observed perturbations. We find significant trends between the vertical aspect ratio and the stellar temperature, disk radial extent, and the dust grain size distribution power law, q. We also confirm a trend between the disk color and stellar effective temperature, where the disk becomes increasingly red/neutral with increasing temperature. Such results have important implications for the evolution of debris disk systems around stars of various spectral types.
Period–Luminosity–Metallicity–Color Relations of Late-type Contact Binaries in the Big Data Era
Authors: Song Lian-Yun , Tian Zhi-Jia 
Published: January 2024

Abstract
Binary stars ubiquitous throughout the Universe are important. Contact binaries (CBs) possessing period–luminosity (PL) relations could be adopted as distance tracers. The PL relations of CBs are influenced by metallicity abundance and color index, which are connected to both the radius and luminosity of stars. Here we propose fine relations of the period–luminosity–metallicity–color (PLZC) from the ultraviolet to infrared bands based on current surveys. The accuracy of the distance estimation is 6% and 8%, respectively, depending on the PLZC relations of the CBs in the infrared and optical bands of the collected data. PLZC models are still more accurate than PLC models in determining intrinsic luminosity, notwithstanding their limited improvement. Meanwhile, these relations based on synthetic photometry are also calibrated. On the basis of the synthetic photometry, a 6% accuracy of distance is estimated. The measured or synthetic data of PLZC or PLC relations in infrared bands comes first in the list of suggestions for distance estimations and is followed by the measured data of optical bands.
A Radio Technosignature Search of Six Resonant Sub-Neptunes Orbiting HD 110067
Authors: Choza Carmen , Croft Steve , Siemion Andrew P. V. , Sheikh Sofia , Lebofsky Matthew , MacMahon David H. E. , Drew Jamie , Worden S. Pete 
Published: January 2024

Abstract
We describe archival observations and analysis of the HD 110067 planetary system using the Green Bank Telescope (GBT) as part of the Breakthrough Listen search for technosignatures. The star hosts six sub-Neptune planets in resonant orbits, and we tune the drift rate range of our search to match the properties of the system derived by Luque et al. Our observations cover frequencies from 1 to 11.2 GHz, using the GBT’s L, S, C, and X-band receivers, to an equivalent isotropic radiated power limit of ∼3 × 1012 W. No technosignatures were found, but this unusual system remains an interesting target for future technosignature searches.
Effect of Combined Application of Hydrofluoric and Phosphoric Acids and Active Irrigation with a Microbrush on Shear Bond Strength of Lithium Disilicate Ceramics to Enamel
Authors: Hatami Masoud , Massoumi Farhood , Safarian Mohammad Sadegh 
Published: January 2024

Abstract

Background:
This study assessed the effect of combined application of hydrofluoric (HF) acid and phosphoric acid (PA) and active irrigation (AI) with a microbrush on shear bond strength (SBS) of lithium disilicate (LDS) ceramics to enamel.

Materials and Methods:
This in vitro study was conducted on 40 extracted teeth that received enamel preparation with a #12 cylindrical bur. Forty IPS e.max LT rods (3mm diameter, 6mm height) were fabricated and randomly assigned to four groups (n = 10) for surface treatment with 5% HF (group 1), 5% HF and AI with a microbrush for 20 seconds (group 2), 5% HF and 32% PA (group 3), and 5% HF and 32% PA plus AI with a microbrush for 20 seconds (group 4). Silane and Choice 2 cement were used for bonding rods to enamel. The SBS was measured by a universal testing machine. Data were analyzed by two-way analysis of variance (ANOVA), Bonferroni, and Chi-square tests (alpha = 0.05).

Results:
Group 4 had the highest SBS, and group 1 had the lowest SBS (P < 0.05). Group 2 had a significantly higher SBS than group 1, and group 4 had a significantly higher SBS than group 3. AI with a microbrush significantly increased the SBS (P < 0.05), but the application of PA caused no significant change in SBS (P > 0.05). The interaction effect of PA and AI on SBS was not significant (P > 0.05).

Conclusion:
The application of PA in addition to 5% HF acid caused no significant change in the SBS of LDS ceramic to enamel. However, AI with a microbrush significantly increased the SBS.
A systematic review of the effect of cochlear implantation on cognition in pre-lingual children
Authors: Upadhya Sushmitha , Chinnaraj Geetha 
Published: January 2024

Abstract

Purpose:
The purpose of the current study was to summarize existing literature on cognitive outcomes in children with cochlear implant (CI) using behavioral and electrophysiological methods.

Method:
The study used a literature search on PubMed, Google Scholar, and Science Direct databases using appropriate keywords. After a thorough full-length review, articles were selected based on the study objectives. The selected articles underwent quality analysis using a critical appraisal skills programme (CASP) questionnaire, and 34 articles were finalized for review.

Result:
The review gave an insight into cognitive outcomes in children with CI. In all the behavioral nonverbal cognitive tests, children with CI showed cognitive development similar to that of normal-hearing children. Cognitive scores showed a modality-specific result. Tasks requiring visual modality such as visual memory were not affected in children with CI even before the implantation. Whereas tasks using the auditory modality showed poorer scores in implanted children. Over the years, implanted children were on par with normal-hearing children in most of the cognitive domains except higher domains such as reasoning. However, in electrophysiological tests, varied results were found.

Conclusion:
Cochlear implants provide not only a long-term sensory benefit but also help in improving the overall cognition of children. The study also focuses on the importance of early implantation and suitable rehabilitation for appropriate cognitive development.
An objective comparison of speech intelligibility and quality of hearing aid of different companies
Authors: Gowthami Basappanapalya Nataraju , Nisha Kavassery Venkateswaran , Uppunda Ajith Kumar 
Published: January 2024

Abstract

Purpose:
This study aimed to verify the intelligibility and quality of hearing aid-processed speech across companies through objective measures. The output of hearing aids programmed to different prescriptive formulae (Company fit, NAL NL 1, NAL NL 2, and DSLv5) across companies (Company I, Company II, Company III, Company IV, and Company V) were recorded and stored in the sound level meter connected to the manikin.

Materials and Methods:
Offline analysis of speech quality of the recorded speech was done using the Hearing Aid Speech Quality Index (HASQI), the intelligibilty was measured using the Hearing Aid Speech Perception Index (HASPI) and Speech Intelligibility Index (SII), and Long-Term Average Speech Spectrum (LTASS) was used to measure the spectral composition of speech.

Results:
When the companies are compared, the hearing aid of Company V showed significantly higher SII values for all prescriptive formulae indicative of better speech intelligibility provided by Company V hearing aids. In terms of speech quality, all the hearing aids showed similar HASQI values.

Conclusions:
The reasons for each of these findings are highlighted and recommendations for best practices on the use of objective measures for verifying the hearing aid output in clinical setups are suggested.
Working memory task performance in a simulated peripheral sensory-motor deficit
Authors: Gafoor Shezeen Abdul , Jagadeesh Anoop Basavanahalli , Uppunda Ajith Kumar 
Published: January 2024

Abstract

Purpose:
The study observed the effects of oral anesthesia (a simulated sensory-motor deficit) on auditory working memory task performance.

Materials and Methods:
In a total of 19 neurotypical young adults, we compared backward digit (BD) spans measured when the primary oro-motor structures were anesthetized (sensory-motor deficit simulation) with those measured without the oral anesthetic (control condition). In a subsequent experiment on a subset of the participants, we also measured the rate of speech (words per second) in the two conditions.

Result:
Paired t tests showed that anesthetization of the oro-motor structures significantly reduced performance in both the BD span and the rate of speech experiments in our participants.

Conclusions:
The worsening of both BD spans (likely due to the affected rehearsal mechanism) and rate of speech (likely due to the sluggish movement of the articulators as an aftereffect of the oral anesthesia) reinforce the notion that sensory-motor feedback achieved via subvocal articulatory rehearsals, a constituent of the phonological loop of the working memory system, contributes to the individuals’ working memory task performances.
Influence of auditory working memory in discriminating children with good musical abilities from children with poor musical abilities
Authors: Sampath Sridhar , Neelamegarajan Devi 
Published: January 2024

AbstractPurpose:Musical abilities are associated with the perception of complex acoustic features in an auditory scene, which requires a good load of cognitive processing. Musical sleepers (individuals with good musical abilities without formal music training) were proven to be in adults, and their enhanced cognitive abilities were established, but such a phenomenon in children is not explored yet. Hence, the present study was carried out to assess auditory working memory (AWM) abilities in children with widespread musical abilities.Materials and Methods:Twenty-nine children within the age range of 7–13 years participated in the study. The children’s musical abilities were assessed using the Montreal Battery for Evaluation of Musical Abilities and scores were recorded. Sixteen and thirteen children were categorized into individuals with good and poor musical abilities, respectively, based on the 50th percentile score as the cutoff. The tests for AWM, such as forward span, backward span, and N-back, were administered.Results:Point biserial correlation showed that groups had a significant positive association with forward span (r= 0.65;P= 0.00), backward span test (r= 0.41;P= 0.02), and N-back test (r= 0.70;P= 0.00). Multivariate analysis of variance (MANOVA) indicated a significant main effect of groups, and post hoc analysis showed that children with good musical abilities outperformed the ones with poor musical abilities in all three working memory measures. Further, Fisher’s discriminant analysis revealed that the N-back test, with discriminant coefficient of 0.75, is the best auditory-cognitive predictor of musical abilities in children.Conclusions:Children who had no musical training exhibited better musical ability. This may be mediated by improved AWM, but an additional investigation into the relationship between musical aptitude and other psychophysical abilities in children without musical training is necessary.