bluuebunny/crossref_metadata_2025_split huggingface dataset:
Spinodal de-wetting of light liquids on graphene
Authors: Vanegas Juan M , Peterson David , Lakoba Taras I , Kotov Valeri N 
Published: January 2022

Abstract
We demonstrate theoretically the possibility of spinodal de-wetting in heterostructures made of light–atom liquids (hydrogen, helium, and nitrogen) deposited on suspended graphene. Extending our theory of film growth on two-dimensional (2D) materials to include analysis of surface instabilities via the hydrodynamic Cahn–Hilliard-type equation, we characterize in detail the spatial and temporal scales of the resulting spinodal de-wetting patterns. Both linear stability analysis and direct numerical simulations of the surface hydrodynamics show micron-sized (generally material dependent) patterns of ‘dry’ regions. The physical reason for the development of such instabilities on graphene can be traced back to the inherently weak van der Waals interactions between atomically thin materials and atoms in the liquid. Thus 2D materials could represent a new theoretical and technological platform for studies of spinodal de-wetting.
BAIRDA: a novel in vitro setup to quantify radiobiological parameters for cervical cancer brachytherapy dose estimations
Authors: Chow Braden , Warkentin Brad , Nanda Kareena , Ghosh Sunita , Huang Fleur , Gamper Armin M , Menon Geetha 
Published: January 2022

AbstractObjective. Brachytherapy (BT) dose prescriptions for locally advanced cervical cancer are made with account for the radiobiological parameters,α/βratio and halftime of repair (T1/2). However, a wide range of parameter values has been reported which can challenge commonly held equivalencies between dose prescriptions. This is the first reported study that aims to develop anin vitroexperimental technique using clinical high-dose-rate (HDR) and pulsed-dose-rate (PDR) Ir-192 brachytherapy afterloaders to quantify these parametersin vitroand to contextualize findings within contemporary practice.Approach. To efficiently quantifyα/βandT1/2,in vitroexperiments more reflective of clinical BT practice than traditional clonogenic survival assays were developed and applied to four squamous cell carcinoma cell lines (CaSki, C-33A, SiHa, and SW756). Radiation was delivered using single acute and fractionated dose treatments with a conventional irradiator and clinical HDR and PDR BT afterloaders. For the latter, a novelbrachytherapyafterloaderin vitroradiationdeliveryapparatus (BAIRDA) was developed.Main Results. Theα/βandT1/2values determined using BAIRDA and the conventional irradiator showed close agreement, validating the novel apparatus and technique. For CaSki, C-33A, SiHa, and SW756, the BAIRDA-measuredα/βratios (5.2 [4.6–5.8], 5.6 [4.5–6.6], 6.3 [4.9–7.7], and 5.3 [4.7–6.0] Gy, respectively) were consistently smaller, while theT1/2(3.3 [2.7–3.9], 2.7 [2.0–3.3], 2.8 (2.4–3.1], and 4.8 [4.1–5.4] hours) larger, than the widely accepted values in clinical practice (α/β= 10 Gy;T1/2 = 1.5 h).Significance.In vitroexperiments using BAIRDA provided evidence for differences between the conventionally selected and experimentally determinedα/βratio andT1/2. Treatment regimens using HDR-BT and PDR-BT, designed to deliver equivalent radiobiological doses based on conventional values, were shown to differ by up to 27 Gy EQD2 – an effect that could impact treatment outcomes in cervical cancer. Furthermore, with BAIRDA, we have developed a novel method for radiobiological research in BT.
Quad-band terahertz metamaterial absorber using three parallel gold strips surrounded by two identical gold ring arcs
Authors: Lai Shengxiong , Xu Wei , Yang Zhuchuang , Lu Liming , Wang Kun , Feng Sen , Zhang Sijian , Wu Yangkuan , Wang Ben-Xin 
Published: January 2022

Abstract
Quad-band terahertz metamaterial absorber with near-perfect absorption is given in this paper. It is designed by a patterned Au layer and a continuous Au film separated by an insulating dielectric layer, of which the patterned Au layer is consisted of three parallel Au strips (a longer and two shorter) surrounded by two Au ring arcs of the same size. Four separated terahertz absorption peaks with narrow bandwidths and large absorptance are realized. The first three absorption peaks are due to the fundamental modes of the Au strips and the Au ring arcs, while the fourth absorption peak is ascribed to the excitation of three-order resonance in the Au ring arcs. The field distributions of the four absorption peaks are presented to verify their physical mechanisms. The influence of geometrical dimensions of the proposed configuration on the performance of the quad-band light absorption is discussed. Moreover, considering the potential sensing applications, the sensing performance of the proposed absorption device is also explored. The suggested scheme could provide considerable application prospects in selective thermal radiation, spectral imaging, sensing, detecting, electromagnetic stealth, etc.
Prospects for measuring dark energy with 21 cm intensity mapping experiments
Authors: Wu Peng-Ju , Zhang Xin 
Published: January 2022

Abstract
Using the 21 cm intensity mapping (IM) technique can efficiently perform large-scale neutral hydrogen (HI) surveys, and this method has great potential for measuring dark-energy parameters. Some 21 cm IM experiments aiming at measuring dark energy in the redshift range of 0<z<3 have been proposed and performed, in which the typical ones using single-dish mode include e.g., BINGO, FAST, and SKA1-MID, and those using interferometric mode include e.g., HIRAX, CHIME, and Tianlai. In this work, we make a forecast for these typical 21 cm IM experiments on their capability of measuring parameters of dark energy. We find that the interferometers have great advantages in constraining cosmological parameters. In particular, the Tianlai cylinder array alone can achieve the standard of precision cosmology for the ΛCDM model (i.e., the precision of parameters is better than 1%). However, for constraining dynamical dark energy, we find that SKA1-MID performs very well. We show that the simulated 21 cm IM data can break the parameter degeneracies inherent in the CMB data, and CMB+SKA1-MID offers σ(w)=0.013 in the wCDM model, and σ(w
0)=0.080 and σ(w
a)=0.25 in the CPL model. Compared with CMB+BAO+SN, Tianlai can provide tighter constraints in ΛCDM and wCDM, but looser constraints (tighter than CMB+BAO) in CPL, and the combination CMB+BAO+SN+Tianlai gives σ(w)=0.013, σ(w
0)=0.055, and σ(w
a)=0.13. In addition, it is found that the synergy of FAST (0<z<0.35)+SKA1-MID (0.35<z<0.77)+Tianlai (0.77<z<2.55) offers a very promising survey strategy. Finally, we find that the residual foreground contamination amplitude has a considerable impact on constraint results. We show that in the future 21 cm IM experiments will provide a powerful probe for exploring the nature of dark energy.
The observed galaxy power spectrum in General Relativity
Authors: Castorina Emanuele , Di Dio Enea 
Published: January 2022

Abstract
Measurements of the clustering of galaxies in Fourier space, and at low wavenumbers, offer a window into the early Universe via the possible presence of scale dependent bias generated by Primordial Non Gaussianites.
On such large scales a Newtonian treatment of density perturbations might not be sufficient to describe the measurements, and a fully relativistic calculation should be employed. The interpretation of the data is thus further complicated by the fact that relativistic effects break statistical homogeneity and isotropy and are potentially divergent in the Infra-Red (IR).
In this work we compute for the first time the ensemble average of the most used Fourier space estimator in spectroscopic surveys, including all general relativistic (GR) effects, and allowing for an arbitrary choice of angular and radial selection functions. We show that any observable is free of IR sensitivity once all the GR terms, individually divergent, are taken into account, and that this cancellation is a consequence of the presence of the Weinberg adiabatic mode as a solution to Einstein's equations. We then study the importance of GR effects, including lensing magnification, in the interpretation of the galaxy power spectrum multipoles, finding that they are in general a small, less than ten percent level, correction to the leading redshift space distortions term. This work represents the baseline for future investigations of the interplay between Primordial Non Gaussianities and GR effects on large scales and in Fourier space.
Thermodynamics for higher dimensional rotating black holes with variable Newton constant *
Authors: Zhao Liu 
Published: January 2022

Abstract
The extensivity for the thermodynamics of general D-dimensional rotating black holes with or without a cosmological constant can be proved analytically, provided that the effective number of microscopic degrees of freedom and the chemical potential are given respectively as

, where G is the variable Newton constant,

is the Euclidean action, and L is a constant length scale. In the cases without a cosmological constant, i.e., the Myers-Perry black holes, the physical mass and the intensive variables can be expressed as explicit macro state functions in the extensive variables in a simple and compact form, which allows for an analytical calculation of the heat capacity. The results indicate that the Myers-Perry black holes with zero, one, and k equal rotation parameters are all thermodynamically unstable.
Investigation of the control characteristics of mineral processing technology indicators
Authors: Pryadko Nataliya , Mladetsky Igor , Dziuba Serhii , Ternova Kateryna 
Published: January 2022

Abstract
The analysis of the reduce possibilities of the production and energy costs is carried out from the control view of the material size and the testing characteristics of the technological mineral processing process. Correct sampling results show the distribution of valuable components in the ore, and then the concentration process improves the concentrate quality. A method of selecting massif pieces in order to form a representative sample is considered. There are determined the dependence of the change in the distribution function of intergrowths on the material size and the dependence of the sample mass on the texture and structural ore properties, i.e. the content of valuable material and the content of ore grains in the ore. Studies have shown that with a change in the piece size, there is a change in the limiting values of the magnetite content in them. Improving the concentrate quality depends on the size of the processing products, for the control of which a method is proposed for determining the distribution function by size class in accordance with the lognormal law for finely dispersed materials, regardless of their physical properties.
Rhenium recovery from sulfuric media using AMR anionite
Authors: Korovin Vadym , Pohorielov Yurii , Shestak Yurii , Valiaiev Oleksandr , Cortina Jose-Luis 
Published: January 2022

Abstract
The paper deals with equilibrium and kinetics of rhenium sorption using AMR weak-base anionite from simulated sulfuric solutions with high and low acidity. A comparative analysis was carried out for Freundlich, Langmuir and Sips sorption models. It was found out that equilibrium experimental data fitted with the highest determination factor by the Sips equation from solutions with high acidity and by the Henry one for low acidic solutions. A comparative analysis was carried out for sorption kinetics using different kinetic models; the values were estimated for calculated effective factors of intra-particle diffusion and model approximation to experimental data. To assess the contribution of chemical interaction in the rhenium sorption process, kinetics data were quantitatively approximated using pseudo-first order, pseudo-second order and Elovich kinetic models. It was found that the pseudo-second order model fits experimental data most accurately. Results were given on rhenium stripping by ammonia solution. The results obtained may be used for rhenium recovery from washing sulfuric acid in the systems of wet dust and gas scrubbing during pyrometallurgical processing of copper ore concentrates and other acidic industrial solutions as well as liquors after uranium sorption.
Co — Ni — Zn nanoferrites: magnetic and photocatalytic properties for the decomposition of 4-nitrophenol
Authors: Frolova Liliia , Tsepich Olena 
Published: January 2022

Abstract
The paper considers changes in the magnetic and catalytic properties of Co- Ni- Zn ferrites by drawing up plans Scheffe’s plans. Three-component ferrites were obtained using coprecipitation and glow dischage treatment. It was found that the saturation magnetization decreases for Ni- Zn ferrites with increasing Zn content, high values for the entire series of Co- Zn, Co-Ni ferrites are observed. The study of catalytic activity in relation to the decomposition reaction of 4-nitrophenol showed excellent results for all compositions. The effect of the mutual influence of the content of different cations on the photocatalytic properties is clearly traced. Ferrites containing one cation in the composition have lower photocatalytic activity. Using UV-spectroscopy, the mechanism of 4-nitrophenol (4-NP) degradation was established.
Optimization of hydrogeological monitoring in the coal-mining region of Western Donbass
Authors: Yevhrashkina Halyna , Kharytonov Mykola , Shikula Elena , Lemishko Svitlana 
Published: January 2022

Abstract
The results of the solutions for assessing the degree of reliability compared with the results of regime observation network, water balance hydrogeological stations and key sites created for it. Epignous tasks occupy a special place in the optimization of hydrogeological monitoring of coal-mining regions. The “disordered dispersion” scheme should recognized as the most reliable after numerous numerical experiments to solve the problems of assessing the technogenic pollution of groundwater in the conditions of Western Donbas. The direct forecasting problem for various periods before the stabilization time was determined and solved at the final stage.
Geomechanical monitoring of pit edge massif deformations of open-pit coal mines on ground-based laser scanning
Authors: Rakhimov Sherzod , Nizamova Albina 
Published: January 2022

Abstract
The laser scanning method, used in combination with traditional mine surveying observations, is one of the most effective and safe ways to conduct surveying and instrumental observations on deforming areas of open-pit mining facilities. The article presents the results of ground-based laser scanning of the “Haranutsky” coal pit and performs a comparative analysis to determine the deformations and displacements of the open pit side for different periods, which was performed in the RISCAN PRO environment. Digital Relief Models (DRM) were constructed to distinguish the observation cycles by colors. Based on the results of the monitoring, it was concluded that no critical displacements and deformations were detected, despite the places of small scree deposits in the rock massif, and further systematic observations were recommended.
Mathematical model of porous solid impregnation based on multichannel representation of the pore system
Authors: Yelisieiev Volodymyr , Lutsenko Vasyl , Berkout Vadim 
Published: January 2022

Abstract
In this work, based on the development of previously constructed concepts of modeling the process of impregnation of porous media with an unknown pore structure, a mathematical model was developed for calculation the change in water absorption of a body immersed in a liquid. The model is based on considering a porous structure in the form of a system of unconnected channels of three different radii. Using a theoretical model and experimental data approximations, the corresponding curves characterizing the truncated radial distribution of porous channels were obtained. Satisfactory agreement with experimental data was obtained for various porous materials. The presented calculations showed that, despite the roughness of the assumptions in the theory of fluid motion through pore channels and the pore system itself, the idea of multichannel is quite justified. It is possible that the variety of channels and their sizes determine mainly the fractal properties of the impregnated samples. The accepted scheme of pore channels shows somewhat underestimated values of the diameters of the middle channels. This indicates the need to include in the structure at least one more parameter, for example, tortuosity, in order to approximate the real characteristics of porous materials.
Study results of the hydroimpulsive loosening of coal-seams at the active stage
Authors: Zberovskiy Vasyl , Pazynich Artem , Zmiievska Kristina , Vlasenko Vasyl 
Published: January 2022

Abstract
The paper deals with the research of fluid impulse injection on a hydraulic stand and the results of mining-experimental studies of cavitation fluid flow dynamic parameters. The defined reliance between frequency and amplitude of self-oscillations on pressure of the liquid boosting in the filtration part of well simulator are considered. It is determined that the regime of periodic disruptive flow of fluid occurring in the filtration part of the well has the following stages: development, constant and damped cavitation. The active stage of hydroimpulsive loosening of outburst-prone coal seams and working ranges of hydroimpulsive action device according to the double amplitude and frequency of self-oscillations of fluid pressure in the well are established.
Regularities of the deformed state of the geotechnical system “soil base – micropile”
Authors: Petrenko Volodymyr , Bannikov Dmytro , Kharchenko Vitalii , Tkach Taisiia 
Published: January 2022

Abstract
Definition and predicting the deformed state of the geotechnical system “soil base – micropile” are the relevant scientific and technical objective when strengthening the soil base by reinforcing elements. The complexity of solving such a problem lies in the heterogeneity of the deformation characteristics for the parts of the specified system. The application of mathematical modeling based on the finite-element method allows defining the behavior of the deformed state in the geotechnical system “soil base – micropile” in the variation of the elastic modulus of its elements. In the course of the numerical analysis of twenty finite-element models characterized by a change in the elastic modulus of the micropile material and soil base, the value of maximum vertical displacements of the strip foundation for the civil structure is obtained. The generalization of these values makes it possible to construct diagrams of their changes in accordance with the variation of the elastic modulus. The obtained regularities allow predicting a deformed state for a sufficiently wide range of the elastic modulus for elements in the system “soil base – micropile”.
Comparative analysis of the VPR-4M vibrating feeder dynamics for the reflected ore output from the outlets and its modernized analog with a vibro-impact adaptive drive
Authors: Shevchenko Volodymyr , Shevchenko Heorgii , Zozulia Halyna , Pukhalskyi Victor 
Published: January 2022

Abstract
A study has been conducted on the developed mathematical model of the VPR-4M vibrating feeder oscillations, which is used for the output and loading of reflected ore from the outlets at underground mining and its modernized analog with a vibro-impact adaptive drive. It is shown that at the same excitation parameters the intensity of the feeder tray oscillations with vibro-impact drive exceeds the intensity of the VPR-4M feeder tray oscillations, which leads to an increase in the transportation speed and ore leakage. With increasing load from the ore on the trays there is an increase in the oscillation parameters of the vibro-impact drive, which leads to more intense oscillations of the feeder tray with vibro-impact drive in comparison with the oscillations of the VPR-4M feeder. The vibrating system of the feeder with vibro-impact adaptive drive performs polyfrequency oscillations, which leads to increased intensity and distance of oscillation spreading in the ore. The identified advantages increase the efficiency and productivity of vibration output by increasing the speed of ore transportation through the tray, intensifying its leakage from the outlet and reducing the probability of ore hangs due to increasing intensity and oscillation distance through the ore in the outlet.
Financial leasing for the extractive industry: status and trends
Authors: Vnukova Nataliya , Tokhtamysh Tetiana , Hranko Kateryna , Sokol Sergii 
Published: January 2022

Abstract
The article proves the necessity and expediency of using financial leasing by extractive industry enterprises to minimize the cost of purchasing, using, maintaining equipment and maintaining production capacity. Foreign and domestic financial leasing practices analyzed and their direct impact on the development of the country’s economy is determined. Financial leasing will become more accessible and understandable for enterprises of different sectors of the economy after the entry into force of the Law of Ukraine “On Financial Leasing”. The analysis of the value of the concluded financial leasing agreements by sectors of the economy carried out and their basic tendencies defined. It is determined that the volume of concluded financial leasing agreements by extractive industry enterprises has a small share in comparison with other branches of economy. The analysis of the effectiveness of structural changes confirm the low demand for financial leasing by extractive industry enterprises. It is determined that the use of financial leasing by extractive industry enterprises will expand existing production, introduce the latest technologies, minimize costs for the purchase, use, maintenance and upgrade of equipment and means of production.
Numerical model for evaluation efficiency of coal pile wetting
Authors: Biliaiev Mykola , Biliaieva Viktoriia , Kozachyna Vitalii , Berlov Oleksandr , Gunko Olena , Rusakova Tetiana 
Published: January 2022

Abstract
Wetting the surface of coal piles is a common method of reducing dust emissions. The problem of modeling air pollution near coal after its wetting is considered. A two-dimensional mass transfer equation was used to model the process of coal dust distribution from the pile. This equation takes into account the convective and diffusion transport of coal dust in the atmosphere. The developed mathematical model takes into account different emission rates of coal dust from different parts of the coal pile. The model takes into account the effect of water evaporation from the coal pile on the rate of intensity of coal dust emission. A potential flow model was used to model the wind flow over the coal pile. Finite-difference splitting schemes have been used for numerical integration of modeling equations. Computer code based on the proposed numerical model has been developed. The developed code can be used to predict the efficiency of wetting coal piles over time. The results of a computational experiment are presented.