bluuebunny/crossref_metadata_2025 huggingface dataset:
Physical properties of vacancy-ordered double perovskites K2TcZ6 (Z = Cl, Br) for spintronics applications: DFT calculations
Authors: Alburaih Huda A. , Nazir Sadia , Noor N. A. , Laref A. , Saad H.-E. M. Musa
Published: January 2024

Our calculated results clearly demonstrate semiconducting ferromagnetic nature of K2TcY6 (Y = Cl, Br) and ultralow values of thermal conductivity (κe) that can prove useful for application of these materials in spintronic and thermoelectric devices.
Opposite regulation effects of Al3+ on different types of carbon quantum dots and potential applications in information encryption
Authors: Han Changdao , Yang Huan , Fan Yan , Wang Zhikun , Li Pei , Jiang Jie , Huang Mohan , Xu Jing , Chen Junlang , Chen Liang
Published: January 2024

Opposite regulation effects of Fe3+ and Al3+ on different CQDs can be applied in fluorescence switch and information encryption.
Improving the efficiency of a CIGS solar cell to above 31% with Sb2S3 as a new BSF: a numerical simulation approach by SCAPS-1D
Authors: Rahman Md. Ferdous , Chowdhury Mithun , Marasamy Latha , Mohammed Mustafa K. A. , Haque Md. Dulal , Al Ahmed Sheikh Rashel , Irfan Ahmad , Chaudhry Aijaz Rasool , Goumri-Said Souraya
Published: January 2024

The remarkable performance of copper indium gallium selenide (CIGS)-based double heterojunction (DH) photovoltaic cells is presented in this work.
Study on synergistic effects of 4f levels of erbium and black phosphorus/SnNb2O6 heterostructure catalysts by multiple spectroscopic analysis techniques
Authors: Li Minze , Wang Jingzhen , Wang Qiuye , Lu Honglai , Wang Guofeng , Fu Honggang
Published: January 2024

Visible-light-driven CO2 photoreduction performance can be improved by utilizing the synergistic effect of BPEr/SNOEr heterostructures, Er single atoms and the Er 4f energy level to facilitate light absorption.
Biocompatible strategies for peptide macrocyclisation
Authors: He Junming , Ghosh Pritha , Nitsche Christoph
Published: January 2024

The identification of macrocyclic peptides in drug discovery demands not only advanced screening strategies but also robust and reliable synthetic methodologies to constrain peptides under biocompatible conditions.
Switchover from singlet oxygen to superoxide radical through a photoinduced two-step sequential energy transfer process
Authors: Yu Shengsheng , Zhu Rong-Xin , Niu Kai-Kai , Han Ning , Liu Hui , Xing Ling-Bao
Published: January 2024

We present an efficient method for the transformation of type II photosensitizers (1O2) into type I photosensitizers (O2˙−) through the implementation of an artificial light-harvesting system involving a two-step sequential energy transfer process.
Electrochemically and chemically stable electrolyte–electrode interfaces for lithium iron phosphate all-solid-state batteries with sulfide electrolytes
Authors: Lu Tenglong , Meng Sheng , Liu Miao
Published: January 2024

This study identifies suitable coating materials that can prevent the electrode–electrolyte interfacial reaction to remove the obstruction in all-solid-state batteries composed of LiFePO4 and sulfide solid electrolytes.
Facile fabrication of TT-T Nb2O5 heterophase junctions via in situ phase transformation towards enhanced photocatalytic H2-production activity
Authors: Wang Jinyuan , Zhou Chao , Wu Jiang , Zhang Tierui
Published: January 2024

TT-T Nb2O5 heterophase junctions synthesized via a facile in situ phase transformation method showed much higher photocatalytic H2-production activity as compared with TT-Nb2O5 and T-Nb2O5 due to the oriented built-in electric field.
Bioinspired functional self-healing hydrogels from a minimalistic dipeptide building block
Authors: Sahu Ipsita , Tang Yiming , Wang Zichao , Naskar Souvik , Vijayakanth Thangavel , Adole Vivek Vishwanath , Wei Guanghong , Chakraborty Priyadarshi
Published: January 2024

Fmoc–Lys(Fmoc)–Phe produced self-healing hydrogels with dye adsorption capability. The Phe groups facilitate the branching of the fibers. Composite hydrogels of the peptide with edge-functionalized graphene oxide exhibited semiconductive behavior.
Understanding the fast kinetics and mechanism of sodium storage in antimony using ab initio grand canonical Monte Carlo simulation and operando X-ray scattering
Authors: Li Manni , Qiu Tian , Welborn Samuel S. , Foucher Alexandre C. , Fu Jintao , Lesel Benjamin K. , Wang Zeyu , Wang Lin , Stach Eric A. , Rappe Andrew M. , Detsi Eric
Published: January 2024

Using ai-GCMC simulations, operando WAXS, and kinetics analysis, we found that the high-rate performance of Sb as an alloy anode in Na-ion batteries is due to the presence of an amorphous intermediate phase formed during sodiation and desodiation.
CoP/CoN heterostructural active centers supported on nitrogen carbon nanorod arrays as freestanding high-performance trifunctional electrocatalysts
Authors: Bai Linming , Wang Dan , Shen Hongchen , Wang Wenlong , Li Shanshan , Yan Wei
Published: January 2024

Freestanding CoP/CoN heterostructure electrocatalysts for zinc–air batteries and water splitting, and the catalytic mechanism was verified based on DFT and experiments.
Photo-crosslinked integrated triphasic scaffolds with gradient composition and strength for osteochondral regeneration
Authors: Wang Wenzhao , Li Hui , Song Ping , Guo Yanbo , Luo Di , Li Hao , Ma Liang
Published: January 2024

A triphasic GELMA based scaffold was used for osteochondral repair. The upper layer was bonded with chondroitin sulfate, the middle and lower layers introduced hydroxyapatite, promoting chondrogenic, angiogenic and osteogenic induction capabilities.
Red cell membrane-coating Prussian blue for combined photothermal and NO gas therapy for nasopharyngeal carcinoma
Authors: Wang Wenbo , Cheng Zhaoyi , Xing Hui , Zhou Shihao , Ye Qiaozhang , Xiong Gaofei , Wang Guanhai , Ma Dong
Published: January 2024

This work provides a nanodelivery platform with excellent biosafety and controlled release of a donor, while enhancing the therapeutic efficacy of nitric oxide gas therapy synergized with photothermal therapy for nasopharyngeal carcinoma.
Nanomedicine facilitated cell signaling blockade: difficulties and strategies to overcome glioblastoma
Authors: Habeeb Mohammad , Vengateswaran Hariharan Thirumalai , You Huay Woon , Saddhono Kundharu , Aher Kiran Balasaheb , Bhavar Girija Balasaheb
Published: January 2024

Nanocarriers loaded with anticancer agents strategically intervene to block cell signaling pathways in glioblastoma.
Structure, luminescence properties, and valence-induced spectral behavior of a bismuth-activated garnet phosphor
Authors: Chen Gongli , Qin Yonghong , Li ZhenHua , Wang Xicheng , Wang Yuhua
Published: January 2024

The increasing demand for full-visible-spectrum lighting has prompted the development of novel phosphors with multicolor emission.
High-performance and environmentally friendly circularly polarized light direct detection based on ZnO nanowires and chiral cellulose nanocrystals
Authors: Yang Junjun , Huang Yuxin , He Sixian , Dang Congcong , Li Ming , Zhao Liancheng , Gao Liming
Published: January 2024

The CPL photodetector composed of a thin film self-assembled from CNC and ZnONWAs has different light responses under RCPL and LCPL irradiation. The detector also has a high asymmetry factor and can be applied to CPL detection.
Impact of magnetostriction mechanism on frequency manipulation ultrasonic steering in electromagnetic acoustic transducers
Authors: Li Yong
Published: January 2024

In this paper, the impact of the magnetostriction mechanism is considered as the focus. An axisymmetric FEM model of the spiral‐coil electromagnetic acoustic transducers (EMAT) is established to conduct the simulation. The simulation results demonstrate that the directivity of ultrasonic wave can be controlled by manipulating the frequency. Furthermore, it is found that the direction of the dominant Lorentz force in the rail varies with time, while the magnetostrictive force compels the ultrasonic wave generated by the Lorentz force towards the axis. It effectively illustrates that the combined power of two mechanisms surpasses that of the Lorentz‐force mechanism alone, particularly at low frequencies.
Modelling, control design, and analysis of the inner control's loops intended for single‐phase voltage‐controlled inverter‐based microgrid
Authors: Ait Hammouda Camelia , Bradai Rafik , Bendib Ahmed , Kherbachi Abdelhammid , Kara Kamel , Boukenoui Rachid , Ahmed Hafiz
Published: January 2024

In voltage‐controlled voltage source inverters (VSIs)‐based microgrids (MGs), the inner control is of prime interest task for guaranteeing safe and stable operation. In this paper, an in‐depth investigation of the modelling, control design, and analysis of the voltage and current inner control loops intended for single‐phase voltage‐controlled VSIs is established. The main objective of this work is to provide a comprehensive study of the mathematical modelling, control design, and performance evaluation of the inner control's loops considering different proportional‐integral (PI) controller types with and without compensation, and to determine the optimal scheme that can offer better performance in terms of implementation simplicity, robustness, and transient and steady‐state responses. Thus, the mathematical closed‐loop models of designed outer voltage and inner current control schemes based on PI, P, and feedforward controllers with and without compensation are, first, derived. Following this, a systematic and effective control design for tuning the different PI controllers’ parameters is proposed. Furthermore, an analysis revealing the performance of the designed voltage and current control schemes is provided. This analysis enables us to choose a P controller and PI feedforward controller for the current control loop and the voltage control loop, respectively. The chosen P and PI controllers should be simple; meanwhile, they should offer a wide bandwidth. A simulation study is carried out in MATLAB/Simulink software to assess the performance of the adopted inner control scheme for both linear and non‐linear loads. In addition, an experimental setup, based on a TMS320F2837xD μC, of a single‐phase VSI supplying linear and non‐linear loads is built to verify the effectiveness and the robustness of the adopted inner controller. The results demonstrated: (1) the necessity of introducing the compensation term, which is responsible for offering control improvement against voltage perturbation, (2) the high tracking performance of the chosen controller in terms of dynamic and steady‐state responses as well as its simplicity of implementation.
Multistatic radar distribution geometry effects on parameter estimation accuracy
Authors: Dhulashia D. , Ritchie M. A.
Published: January 2024

An analysis of the parameter estimation uncertainty for the target location and velocity achievable using a single‐transmitter‐multiple‐receiver multistatic radar system is presented. A framework for establishing measures of multistatic radar parameter uncertainties by expansion of the bistatic radar parameter uncertainty measures is presented for systems containing omnidirectionally radiating nodes. The methodology uses analytical methods based on the Cramér–Rao Lower Bounds applied to scenarios in a two‐dimensional physical space with a single target exhibiting Doppler characteristics and a bistatic angle dependent radar cross‐section. A set of geometric descriptors is proposed to characterise the system, and parameter uncertainty results are reported as a function of these descriptors. The results indicate that angular separation between the transmitter and the centre of the receiver distribution is of greater importance than the quantity of receivers within the system when low uncertainty estimation capabilities are desired, though a minimum of two receivers must be available. The proportion of receivers within the system which contributed information crucial to obtaining the minimum estimation uncertainty is reported for systems containing different quantities of receivers. It was observed that, as the total number of receivers available increased, the proportion of receivers required to achieve the minimal uncertainty level reduces significantly.
Energy harvesting from water flow through porous reduced graphene oxide networks
Authors: Panchal Reena A. , Koratkar Nikhil A.
Published: January 2024

Using a syringe pump setup, the authors conducted water flow experiments through porous reduced graphene oxide (rGO). A variety of anions and cations were added to the water to study its effect on energy harvesting. More specifically, the authors performed tests to study effect of: (1) ion concentration in water, (2) type of anion used, (3) type of cation used, and (4) effect of flow rate. The test data indicates that water flow through rGO networks can directly induce drift of charge carriers in graphene and thus generate electricity. Graphene is ideally suited for this application, since it possesses high mobility charge carriers that are ready to be coupled to moving ions present in the flowing fluid. The proposed rGO material could enable harvesting of the ubiquitous, abundant, and renewable mechanical energy of moving water directly to electrical energy. Unlike traditional schemes, the graphene material directly converts the flow energy into electrical energy without the need for moving parts. Such graphene coatings could potentially replace conventional batteries (which are environmentally hazardous) in low‐power, low‐voltage, and long service‐life applications. Once scaled up, this concept offers a potentially transformative approach to energy harvesting, as opposed to incremental advances in current technologies.
Simulating small-scale dynamo action in cool main-sequence stars
Authors: Riva Fabio , Steiner Oskar , Freytag Bernd
Published: January 2024

Context. The origin of the ubiquitous small-scale magnetic field observed on the solar surface can be attributed to the presence of a small-scale dynamo (SSD) operating in the sub-surface layers of the Sun. It is expected that a similar process could self-sustain a considerable amount of magnetic energy also in the near-surface layers of cool main-sequence stars other than the Sun.

Aims. In this paper the properties of the magnetic field resulting from SSD action operating in the near-surface layers of four cool main-sequence stars and its self-organization into magnetic flux concentrations are investigated numerically.

Methods. Three-dimensional radiative magnetohydrodynamic simulations of SSD action in the near-surface layers of four cool main-sequence stars of spectral types K8V, K2V, G2V, and F5V are carried out with the CO5BOLD code. The simulations are set up to have approximately the same Reynolds and magnetic Reynolds numbers, and to disentangle the impact of the effective temperature and the surface gravity on the SSD action from numerical effects.

Results. It is found that the SSD growth rates in SI units differ for the four stellar models; the highest and lowest growth rate is for the K2V and F5V model, respectively. This is due to the different turnover times in the four simulations. Even so, the SSD field strengths reached in the saturation phases are similar in all models, with the same amount of kinetic energy converted into magnetic energy. If the magnetic energy that is pumped out from the computational domain across the bottom boundary is partially replenished from outside of the computational domain, we find that the SSD action leads to a sufficient reduction in the convective velocities to reduce the convective horizontal length scales in the convection zone by 5–10%, vanishing towards the optical depth unity level. In this case, strong kilogauss magnetic flux concentrations emerge at the surface, leading to magnetic bright features, which are more numerous and conspicuous for the K2V and G2V models than for the K8V and F5V models. Their vertical magnetic field component on the surface of optical depth unity increases from 1 kG to 1.6 kG with decreasing effective temperature from F5V to K8V. However, more than 90% of the magnetic flux through any of these stellar surfaces has a field strength of less than 1 kG.
Towards a self-consistent model of the convective core boundary in upper main sequence stars
Authors: Andrassy R. , Leidi G. , Higl J. , Edelmann P. V. F. , Schneider F. R. N. , Röpke F. K.
Published: January 2024

There is strong observational evidence that the convective cores of intermediate-mass and massive main sequence stars are substantially larger than those predicted by standard stellar-evolution models. However, it is unclear what physical processes cause this phenomenon or how to predict the extent and stratification of stellar convective boundary layers. Convective penetration is a thermal-timescale process that is likely to be particularly relevant during the slow evolution on the main sequence. We use our low-Mach-number SEVEN-LEAGUE HYDRO code to study this process in 2.5D and 3D geometries. Starting with a chemically homogeneous model of a 15 M⊙ zero-age main sequence star, we construct a series of simulations with the luminosity increased and opacity decreased by the same factor, ranging from 103 to 106. After reaching thermal equilibrium, all of our models show a clear penetration layer; its thickness becomes statistically constant in time and it is shown to converge upon grid refinement. The penetration layer becomes nearly adiabatic with a steep transition to a radiative stratification in simulations at the lower end of our luminosity range. This structure corresponds to the adiabatic ‘step overshoot’ model often employed in stellar-evolution calculations. The simulations with the highest and lowest luminosity differ by less than a factor of two in the penetration distance. The high computational cost of 3D simulations makes our current 3D data set rather sparse. Depending on how we extrapolate the 3D data to the actual luminosity of the initial stellar model, we obtain penetration distances ranging from 0.09 to 0.44 pressure scale heights, which is broadly compatible with observations.
Environmental dependence of AGN activity and star formation in galaxy clusters from Magneticum simulations
Authors: Rihtaršič G. , Biffi V. , Fabjan D. , Dolag K.
Published: January 2024

Context. The environment inside and on the outskirts of galaxy clusters has a profound impact on the star formation rate and active galactic nucleus (AGN) activity in cluster galaxies. While the overall star formation and AGN suppression in the inner cluster regions has been thoroughly studied in the past, recent X-ray studies also indicate that conditions on the cluster outskirts may promote AGN activity.

Aims. We investigate how the environment and the properties of host galaxies impact the levels of AGN activity and star formation in galaxy clusters. We aim to identify significant trends in different galaxy populations and suggest possible explanations.

Methods. We studied galaxies with stellar mass log M*(M⊙) > 10.15 in galaxy clusters with mass M500 > 1013 M⊙ extracted from box2b (640 comoving Mpc h−1) of the Magneticum Pathfinder suite of cosmological hydrodynamical simulations at redshifts 0.25 and 0.90. We examined the influence of stellar mass, distance to the nearest neighbouring galaxy, cluster-centric radius, substructure membership, and large-scale surroundings on the fraction of galaxies hosting an AGN, star formation rate, and the ratio between star-forming and quiescent galaxies.

Results. We find that in low-mass galaxies, AGN activity and star formation are similarly affected by the environment and decline towards the cluster centre. In massive galaxies, the impact is different; star-formation level increases in the inner regions and peaks between 0.5 and 1 R500 with a rapid decline in the centre, whereas AGN activity declines in the inner regions and rapidly rises below R500 towards the centre. We suggest that this increase is a result of the larger black hole masses relative to stellar masses in the cluster centre. After disentangling the contributions of neighbouring cluster regions, we find an excess of AGN activity in massive galaxies on the cluster outskirts (∼3 R500). We also find that the local density, substructure membership, and stellar mass strongly influence star formation and AGN activity but verify that they cannot fully account for the observed radial trends.
HD 214220 (BD+56 2813): An eclipsing binary with its primary component at the end of the main sequence
Authors: Schmutz W.
Published: January 2024

Context. Analysis of the light curves of an eclipsing binary allows one to derive the absolute dimensions of the system. This in turn yields information on the radii of the components, which allows the stars to be accurately placed on the Hertzsprung-Russell diagram and their evolutionary phase to be interpreted via comparisons to tracks of stellar evolution models.

Aims. I aim to derive the stellar and system parameters of HD 214220.

Methods. I measured the epochs of three primary and three secondary minima of the eclipsing binary HD 214220 from 2019 to 2022 from photometric fluxes obtained by the TESS satellite. I modeled the light curve and the velocity amplitudes, which were obtained by the Gaia satellite, with the software PHOEBE.

Results. HD 214220 is an eclipsing binary system with an orbital period of P = 43.14 d, eclipse depths of 17% and 13%, and masses of 2.49 M⊙ and 2.42 M⊙. The sum of the radii is R1 + R2 ≈ 8.5 R⊙, and the temperatures of the components are similar, with a ratio of T2/T1 ≈ 1.03.

Conclusions. By consulting stellar evolution models, I find that the primary component has ended core hydrogen burning and is potentially in the contraction phase, prior to shell burning.
Observation of solar radio burst events from Mars orbit with the Shallow Radar instrument
Authors: Gerekos Christopher , Steinbrügge Gregor , Jebaraj Immanuel C. , Casillas Andreas , Donini Elena , Sánchez-Cano Beatriz , Lester Mark , Magdalenić Jasmina , Peters Sean T. , Romero-Wolf Andrew , Blankenship Donald D.
Published: January 2024

Context.Multispacecraft and multiwavelength observations of solar eruptions, such as flares and coronal mass ejections, are essential to understanding the complex processes behind these events. The study of solar burst events in the radio frequency spectrum has relied almost exclusively on data from ground-based observations and a few dedicated heliophysics missions such as STEREO or Wind.

Aims.By reanalysing existing data from the Mars Reconnaissance Orbiter (MRO) Shallow Radar (SHARAD) instrument, a Martian planetary radar sounder, we discovered the instrument was also capable of detecting solar radio bursts and that it was able to do so with unprecedented resolution for a space-based solar instrument. In this study, we aim to demonstrate the reliability and value of SHARAD as a new solar radio observatory.

Methods.We characterised the sensitivity of the instrument to type III solar radio bursts through a statistical analysis of correlated observations using STEREO and Wind as references. Using 38 correlated detections, we established the conditions under which SHARAD can observe solar bursts in terms of acquisition geometry. As an example of scientific application, we also present the first analysis of type III characteristic times at high resolution beyond 1 AU.

Results.A simple logistic model based purely on geometrical acquisition parameters can predict burst show versus no-show in SHARAD data with an accuracy of 79.2%, demonstrating the reliability of the instrument in detecting solar bursts and laying the foundation for using SHARAD as a solar radio observatory. The extremely high resolution of the instrument, both in temporal and frequency directions; its bandwidth; and its position in the Solar System enable SHARAD to make significant contributions to heliophysics. Notably, it could provide data on plasma processes on the site of the burst generation and along the propagation path of associated fast electron beams.
The progenitor of SN 2023ixf from hydrodynamical modeling
Authors: Bersten M. C. , Orellana M. , Folatelli G. , Martinez L. , Piccirilli M. P. , Regna T. , Román Aguilar L. M. , Ertini K.
Published: January 2024

Context. The supernova (SN) 2023ixf is among the nearest Type II SNe discovered in recent decades. As such, there is a wealth of observational data of both the event itself and of the associated object identified in pre-explosion images. This has enabled variety of studies aimed at determining the SN properties and the nature of the putative progenitor star. Modeling the light curve is a powerful method to derive the physical properties independently of direct progenitor analyses.

Aims. We investigate the physical nature of SN 2023ixf based on a hydrodynamical modeling of its bolometric light curve and expansion velocities during the complete photospheric phase.

Methods. A grid of one dimensional (1D) explosions was calculated for evolved stars of different masses. We derived the properties of SN 2023ixf and its progenitor by comparing our models with the observations.

Results. The observations at t ≳ 20 days are aptly reproduced by the explosion of a star with zero-age main sequence mass of MZAMS = 12 M⊙, an explosion energy of 1.2 × 1051 erg, and a nickel mass of 0.05 M⊙. This indicates that SN 2023ixf was a normal event. Our modeling suggests a limit of MZAMS < 15 M⊙, thereby favouring the low-mass range among the results from pre-explosion observations.
The TNG50-SKIRT Atlas: Wavelength dependence of the effective radius
Authors: Baes Maarten , Mosenkov Aleksandr , Kelly Raymond , Abdurro’uf  , Andreadis Nick , Bokona Tulu Sena , Camps Peter , Tassama Emana Abdissa , Fritz Jacopo , Gebek Andrea , Kovačić Inja , La Marca Antonio , Martorano Marco , Nersesian Angelos , Rodriguez-Gomez Vicente , Tortora Crescenzo , Trčka Ana , Vander Meulen Bert , van der Wel Arjen , Wang Lingyu
Published: January 2024

Galaxy sizes correlate with many other important properties of galaxies, and the cosmic evolution of galaxy sizes is an important observational diagnostic for constraining galaxy evolution models. The effective radius is probably the most widely used indicator of galaxy size. We used the TNG50-SKIRT Atlas to investigate the wavelength dependence of the effective radius of galaxies at optical and near-infrared (NIR) wavelengths. We find that, on average, the effective radius in every band exceeds the stellar mass effective radius, and that this excess systematically decreases with increasing wavelength. The optical g-band (NIR Ks-band) effective radius is on average 58% (13%) larger than the stellar mass effective radius. Effective radii measured from dust-obscured images are systematically larger than those measured from dust-free images, although the effect is limited (8.7% in the g-band, 2.1% in the Ks-band). We find that stellar population gradients are the dominant factor (about 80%) in driving the wavelength dependence of the effective radius, and that differential dust attenuation is a secondary factor (20%). Comparing our results to recent observational data, we find offsets in the absolute values of the median effective radii, up to 50% for the population of blue galaxies. We find better agreement in the slope of the wavelength dependence of the effective radius, with red galaxies having a slightly steeper slope than green–blue galaxies. Comparing our effective radii with those of galaxies from the Siena Galaxy Atlas in separate bins in z-band absolute magnitude and g − z colour, we find excellent agreement for the reddest galaxies, but again significant offsets for the blue populations: up to 70% for galaxies around Mz = −21.5. This difference in median effective radius for the bluer galaxies is most probably due to intrinsic differences in the morphological structure of observed and TNG50 simulated galaxies. Finally, we find that the median effective radius in any broadband filter increases systematically with decreasing u − r colour and with increasing galaxy stellar mass, total SFR, sSFR, and dust-to-stellar-mass ratio. For the slope of the wavelength dependence of Re, however, there does not seem to be a systematic, monotonic correlation with any of these global properties.
Maser polarization through anisotropic pumping
Authors: Lankhaar Boy , Surcis Gabriele , Vlemmings Wouter , Impellizzeri Violette
Published: January 2024

Context. Polarized emission from masers is an excellent tool to study magnetic fields in maser sources. The linear polarization of the majority of masers is understood as an interplay of maser saturation and anisotropic pumping. However, for the latter mechanism, no quantitative modeling has been presented yet.

Aims. We aim to construct a comprehensive model of maser polarization, including quantitative modeling of both anisotropic pumping and the effects of maser saturation on the polarization of masers.

Methods. We extended regular (isotropic) maser excitation modeling with a dimension that describes the molecular population alignments, as well as including the linear polarization dimension to the radiative transfer. The results of the excitation analysis yielded the anisotropic pumping and decay parameters, which were subsequently used in one-dimensional proper maser polarization radiative transfer modeling.

Results. We present the anisotropic pumping parameters for a variety of transitions from class I CH3OH masers, H2O masers, and SiO masers. SiO masers are highly anisotropically pumped due to them occurring in the vicinity of a late-type star, which irradiates the maser region with a strong directional radiation field. Class I CH3OH masers and H2O masers occur in association with shocks, and they are modestly anisotropically pumped due to the anisotropy of the excitation region.

Conclusions. Our modeling constitutes the first quantitative constraints on the anisotropic pumping of masers. We find that anisotropic pumping can explain the high polarization yields of SiO masers, as well as the modest polarization of unsaturated class I CH3OH masers. The common 22 GHz H2O maser has a relatively weak anisotropic pumping; in contrast, we predict that the 183 GHz H2O maser is strongly anisotropically pumped. Finally, we outline a mechanism through which non-Zeeman circular polarization is produced, when the magnetic field changes direction along the propagation through an anisotropically pumped maser.
Properties, age, and origin of a huge meteor cluster observed over Scandinavia on 30 October 2022
Authors: Koten P. , Čapek D. , Midtskogen S. , Shrbený L. , Spurný P. , Hankey M.
Published: January 2024

Context. A meteor outburst consisting of at least 22 meteors above the Baltic sea and southern Scandinavia that occurred on 30 October 2022 was recorded using multiple cameras. A bright fireball was followed by fainter meteors over a 10 second period. All the meteors were travelling on parallel trajectories.

Aims. The goal of this study is to determine the atmospheric trajectories and photometric masses of meteors and to use these data to determine the specifics of the progenitor meteoroid break-up and cluster formation.

Methods. Double and triple-station observations using video cameras were used for the calculation of the atmospheric trajectories and photometric masses of the meteors. Their relative positions and mass distribution were then used to determine the time and cause of the meteoroid fragmentation.

Results. The relative position of the cluster particles in the atmosphere and the distribution of their masses best correspond to the separation of the smaller fragments from the mass-dominant fragment 10.6 ± 1.7 days before the collision with Earth, assuming a meteoroid bulk density of 1000 kg m−3. The ejection velocities are in the range 0.16–0.61 ms−1. The directions of the ejection velocities are bounded by a cone with an apex angle of 43°. The axis of this cone has ecliptic coordinates of l = 154° and b = 26° and is 66° away from the direction to the Sun. Thermal stresses appear to be the most likely cause of such meteor cluster formation.
Diffuse interstellar bands in Gaia DR3 RVS spectra
Authors: Zhao H. , Schultheis M. , Qu C. , Zwitter T.
Published: January 2024

Diffuse interstellar bands (DIBs) are weak and broad interstellar absorption features in astronomical spectra that originate from unknown molecules. To measure DIBs in spectra of late-type stars more accurately and more efficiently, we developed a random forest model to isolate the DIB features from the stellar components. We applied this method to 780 thousand spectra collected by the Gaia Radial Velocity Spectrometer (RVS) that were published in the third data release (DR3). After subtracting the stellar components, we modeled the DIB at 8621 Å (λ8621) with a Gaussian function and the DIB around 8648 Å (λ8648) with a Lorentzian function. After quality control, we selected 7619 reliable measurements for DIB λ8621. The equivalent width (EW) of DIB λ8621 presented a moderate linear correlation with dust reddening, which was consistent with our previous measurements in Gaia DR3 and the newly focused product release. The rest-frame wavelength of DIB λ8621 was updated as λ0 = 8623.141 ± 0.030 Å in vacuum, corresponding to 8620.766 Å in air, which was determined by 77 DIB measurements toward the Galactic anticenter. The mean uncertainty of the fit central wave-length of these 77 measurements is 0.256 Å. With the peak-finding method and a coarse analysis, DIB λ8621 was found to correlate better with the neutral hydrogen than with the molecular hydrogen (represented by 12CO J = (1−0) emission). We also obtained 179 reliable measurements of DIB λ8648 in the RVS spectra of individual stars for the first time, further confirming this very broad DIB feature. Its EW and central wavelength presented a linear relation with those of DIB λ8621. A rough estimation of λ0 for DIB λ8648 was 8646.31 Å in vacuum, corresponding to 8643.93 Å in air, assuming that the carriers of λ8621 and λ8648 are comoving. Finally, we confirmed the impact of stellar residuals on the DIB measurements in Gaia DR3, which led to a distortion of the DIB profile and a shift of the center (≲0.5 Å), but the EW was consistent with our new measurements. With our measurements and analyses, we propose that the approach based on machine learning can be widely applied to measure DIBs in numerous spectra from spectroscopic surveys.
HCNH+ abundance in cold dense clouds based on the first hyperfine resolved rate coefficients
Authors: Bop Cheikh T. , Agúndez Marcelino , Cernicharo Jose , Lefloch Bertrand , Lique François
Published: January 2024

The protonated form of hydrogen cyanide, HCNH+, holds significant importance in astrochemistry, serving as an intermediate species in ion-neutral reactions occurring in the cold molecular clouds. Although it plays a crucial role in the chemistry of HCN and HNC, the excitation rate coefficients of this molecular cation by the dominant interstellar colliders have not been thoroughly investigated, leading to limitations in the radiative transfer models used to derive its abundance. In this work, we present the first hyperfine-resolved excitation rate coefficients for HCNH+ induced by collisions with both He and H2 at low temperatures, addressing a crucial requirement for precise modeling of HCNH+ abundance in typical cold dense molecular clouds. Using non-local thermodynamic equilibrium (non-LTE) radiative transfer calculations, we reproduced the 1 → 0 and 2 → 1 observational spectra of HCNH+ fairly well and derived updated molecular column densities. For the TMC-1 molecular cloud, the new HCNH+ abundance is twice as large as suggested by previous LTE modeling, whereas the column density of this molecular cation is improved only by 10% in the case of the L483 proto-star. The factor of two in the case of TMC-1 most likely arises from an error in the early analysis of observational spectra rather than an effect of the LTE assumption, given that the HCNH+ lines are predominantly thermalized at densities higher than 2 × 104 cm−3. For multiline studies of clouds of moderate densities, we strongly recommend using the collisional rate coefficients reported in this work.
RETRACTED: The role of physical education in preserving the integrity of human existence
Authors: Byankina Larisa , Manikovskaya Mariya , Stukova Ekaterina
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Russian Volga federal district regions’ digitalisation as a factor of their sustainable development
Authors: Eflova Maria , Glebova Irina , Zakirov Ayaz , Vavilova Tatyana
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Strategy of designing additional educational programs in the field of teachers’ digital competencies of the higher agricultural education
Authors: Gulyak Ivan , Gavrilova Oksana , Rodionova Valentina , Shvatchkina Lyudmila , Lesnykh Juliya
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Nutrition of frequently ill preschool children in organized collectives
Authors: Akhmadaliyeva N.O. , Salomova F.I. , Sadullayeva Kh.A. , Abdukadirova L.K. , Imamova A.O.
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Ground thermometric studies at the MSU meteorological observatory site
Authors: Frolov D.M. , Rzhanitsyn G.A. , Koshurnikov A.V. , Gagarin V.E.
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Phytomass carbon pool dynamics in the reference fir stands of the taiga zone
Authors: Sultson Svetlana , Mikhaylov Pavel , Kulakova Nadezhda , Slinkina Olga
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Problems and prospects of functional nutrition in Russia: industry and social aspect
Authors: Krotova Olga , Efimov Denis , Detochenko Ludmila , Orobinskaya Valeria , Kholodova Ekaterina , Eroshenko Arina
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Genetic profile and association of candidate gene polymorphism with productivity of Kalmyk cattle
Authors: Chimidova Nadezhda , Ubushieva Altana , Ubushieva Victoria , Khakhlinov Arslang , Alenikova Daria
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Monitoring of the state of atmospheric air on the example of the city of Omsk
Authors: Shustova Ulyana , Korchevskaya Yulia , Trotsenko Irina , Shelest Sergey
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Biochemical parameters of dairy goats of the Zaanen breed when using a preparation based on bacillus Amyloliquefaciens
Authors: Molyanova Galina , Semkina Oksana , Statenko Bogdan , Vinokurova Alisa , Ermakov Vladimir
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Cultural foundations of the educational system and legal upbringing in the conditions of contemporary political and legal reality transformation
Authors: Rybak Svetlana , Krygina Irina
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Infusion extraction and measurement on CT images based on computer vision and neural network
Authors: Hamad Yousif A. , Alekhina Anna , Pleshkova Tatiana , Shestakova Olga
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Artificial Neural Network-based fatigue behavior prediction of metals and composite materials
Authors: Koptiaev Dmitrii , Ivanov Yuri , Chashin Nikolai , Lupachev Daniil
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Principles of ontophylogenetic development of artificial general intelligence systems based on multi-agent neurocognitive architectures
Authors: Anchekov M.I. , Apshev A.Z. , Bzhikhatlov K.Ch. , Kankulov S.A. , Nagoev Z.V. , Nagoeva O.V. , Pshenokova I.A.
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Using LSTM neural network for power consumption forecasting
Authors: Abdurazakov Nosirbek , Aliev Rayimjon , Ergashev Sirojiddin , Kuchkarov Akmaljon
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: On the issue of mathematical modeling of the interaction of phases in energy-packed heat and mass transfer devices
Authors: Ismailov Bakhtiyar , Babakhodzhaev Raximjon , Kuchkarov Akmaljon , Mamatov Olmos , Ismailov Khayrullo , Hamdamov Diyorbek , Qipchaqova Gavxar
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Numerical investigation of multiphase flow in a channel
Authors: Salomov Uktam , Madaliyev Murodil , Kuchkarov Akmaljon
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Mathematical modeling of heliothermal chemical processes during hardening of multicomponent cement materials
Authors: Alinazarov A.Kh. , Salimzhanov Zh.Kh.
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Mathematical modeling of particle movement in laminar flow in a pipe
Authors: Ibrokhimov Abdulfatto , Orzimatov Jahongir , Usmonov Mavlonbek , Otakulov Bakhromjon , Mirzababayeva Saxiba
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Selection of efficiency criterion on information security management system creation proccess in point if data processing networks
Authors: Tursunbaev T.B.
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Study of the correlation dependence of complications in the organization of medication support when using cilostazol drugs as complex therapy for diabetic foot syndrome
Authors: Koreyba K.A. , Dibirov M.D. , Gadzhimuradov R.U. , Koreiba D.K.
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Molecular detection of antimicrobial resistance genes among ciprofloxacin-resistant Pseudomonas aeruginosa isolates
Authors: Al-Salami Mohammed Abbas Farman , Tuwaij Nabil Salim Saaid
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Interaction of pediatrician, oncologist and therapist in the complex therapy of children’s patients
Authors: Musaeva R.M. , Basharov M.M. , Magomedov M.M. , Tserr A.E. , Bashmakova N.S. , Korshagina A.M. , Khabibulla E.A.
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Prevention of infections of various genesis in children’s patients: approaches and methods in modern conditions
Authors: Pyrchenkova A.S. , Palchaeva A.T. , Zhukova V.S. , Abdullaeva E.N. , Agabekova N.N.
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: The role of the therapist and neurologist in pain management in patients suffering from cardiovascular diseases
Authors: Ivashchenko T.V. , Vartanyan V.A. , Sevriugina E.A. , Chkareuli D.N. , Kazakova M.S.
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Microsurgical dissection methods for embryonic cloning of monozygotic twins
Authors: Babenkov Vladimir , Chimidova Nadezhda , Ubushieva Altana , Manzhiev Vasily
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Russian trends in ensuring gender equality in the digital economy
Authors: Kuzmina Svetlana , Vaganova Valentina , Erochkina Olga , Kanunnikova Kristina
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: “Atypical child” in an educational environment in the Murmansk region
Authors: Zhigunova Galina , Afonkina Yulia
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: The interconnection between the emotional state and the level of development of logical thinking of children of preschool senior age
Authors: Kozedub Anastasiya , Dolitskay Itamirel , Kachan Yuliya
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Methodology for assessing the effectiveness of the management system
Authors: Arakelyan Gleb , Deniskina Antonina , Fokin Nikolai , Krotov Aleksandr
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Development of a supplier assessment model
Authors: Arakelyan Gleb , Samotin Ivan , Ageeva Elena , Lunyakov Mikhail
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Discourse strategies of ecology and environment
Authors: Shamahmudova Aziza , Djalilova Sarvaroy
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Mobile-assisted means of developing ecologic awareness in contects of modern legislation
Authors: Toshmatov Oybek , Rasulova Mahbuba
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Study of use and perception of Internet information by young people with a field-dependent/field-independent cognitive style for decision making for sustainable development
Authors: Pishchik Vlada , Azarko Elena , Sinko Tatiana
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Psychological and genetic characteristics and strategies of students’ digital behavior in the context of the formation of the digital ecosystem
Authors: Denisova Ekaterina , Ermakov Pavel , Kupriyanov Igor , Grishina Anastasia , Shchetinin Alexey
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: The role of world’s natural-science picture formation in the professional thinking development process of aquaculture specialists
Authors: Neidorf Anna , Tkacheva Irina , Kokhanov Yuriy , Morozova Marina , Abrosimova Ekaterina
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Methods of power consumption in conditions of high-productive areas of coal mines
Authors: Reshetnyak Sergey , Golubov Evgeny
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001
RETRACTED: Modern design solutions in the design of boiler units, ovens and fireboxes burning solid fuel in a fluidified bed
Authors: Feoktistov I.I. , Kovalev D.S. , Shaikh M. , Chechetkin D.A.
Published: January 2024

See the retraction notice BIO Web of Conferences 84, 00001 (2024), https://doi.org/10.1051/bioconf/20248400001