bluuebunny/crossref_metadata_2025_split huggingface dataset:
Optimal quantum transfer from input flying qubit to lossy quantum memory
Authors: Chatterjee Eric , Soh Daniel , Eichenfield Matt 
Published: January 2022

Abstract
In a quantum network, a key challenge is to minimize the direct reflection of flying qubits as they couple to stationary, resonator-based memory qubits, as the reflected amplitude represents state transfer infidelity that cannot be directly recovered. Optimizing the transfer fidelity can be accomplished by dynamically varying the resonator’s coupling rate to the flying qubit field. Here, we analytically derive the optimal coupling rate profile in the presence of intrinsic loss of the quantum memory using an open quantum systems method that can account for intrinsic resonator losses. We show that, since the resonator field must be initially empty, an initial amplitude in the resonator must be generated in order to cancel reflections via destructive interference; moreover, we show that this initial amplitude can be made sufficiently small as to allow the net infidelity throughout the complete transfer process to be close to unity. We then derive the time-varying resonator coupling that maximizes the state transfer fidelity as a function of the initial population and intrinsic loss rate, providing a complete protocol for optimal quantum state transfer between the flying qubit and resonator qubit. We present analytical expressions and numerical examples of the fidelities for the complete protocol using exponential and Gaussian profiles. We show that a state transfer fidelity of around 99.9% can be reached momentarily before the quantum information is lost due to the intrinsic loss in practical resonators used as quantum memories.
Spatial assessment of air pollution due to mining and industrial activities: a case study of Kryvyi Rih, Ukraine
Authors: Batur Maryna , Babii Kateryna 
Published: January 2022

Abstract
Air pollution has remained a primary concern over the last decades. Respirable particulate matters (PM) PM2.5 and PM10 are the main atmospheric pollutants that have an adverse effect on human health. This study aimed to examine the air quality of Kryvyi Rih region through the spatial assessment by means of Ordinary Kriging. The study region has a major iron ore basin with several open cast mining operations and industrial activities, which are mainly contribute to the environmental issues. For the study, 10 monitoring stations were chosen located around the main residential and industrial areas of the city. The results showed that industrial plants were the largest sources of PM emissions. The average Air Quality Index (AQI) of PM2.5 and PM10 for the observed period obtained from the station located in close vicinity to the industrial plants were 170 and 89 respectively. Additionally, the 48 hours of PM dynamics were graphically analysed. It was found that PM reaches a peak primary between 12 AM and 12 PM before falling a little between 12 PM and 12 AM.
Efficiency of mine water use in the centralized heat supply system of city district
Authors: Kolienko Anatolii , Ahmednabiev Rasul , Turchenko Vitalii , Bondar Liudmyla , Demchenko Oksana 
Published: January 2022

Abstract
Technological solutions for the use of mine waters energy potential in district heating system of settlements in the coal-mining regions using heat pumps have been substantiated. Using the example of mines in the Central Donbas, an analysis of composition and quantity of mine waters has been carried out, an assessment of the energy potential of mine waters and an assessment of the sufficiency of such a potential to meet the needs of buildings of cities for heating and hot water supply have been carried out. A schematic diagram has been developed for the implementation of a project for the use of mine water in district heating systems in cities while maintaining the function of existing boiler heating systems as peak sources of heat. Thermodynamic calculations of the heat pump cycle in real conditions of using mine water have been carried out. A quantitative assessment of the main technical, economic and environmental indices of the project is presented. The selection of equipment has been carried out and the efficiency assessment of its work has been made. It is recommended to use heat pumps using the thermal potential of mine water in district heating systems for both operating and closed mines.
Development of methods and software algorithms for state forecast of the ultimate stressed rock massif
Authors: Slashchov Anton , Yalanskyi Oleksii , Slashchov Ihor , Siromaschenko Illya 
Published: January 2022

Abstract
The article covers a live scientific problem consisting in development of new and improving of existing digital technologies for forecasting a stress-strain state of ultimate stressed rock massif. The analysis of the researches has shown that the approaches based on the synthesis of mine monitoring methods and analytical forecasting methods are promising for assessing the state of ultimate stressed rocks. The existing hazard indicators can be beaded by the integral indicators of the stress-strain state of the rock massif determined with the help of geo-information systems. However, there are no methods, algorithms and software for figuring these indications. As a result of the research, methods of implementation and functions of software elements have been developed for determining integral indicators characterizing the state of an ultimate stressed rock massif. The “Methodological recommendations …” have been developed, which describes specificity of using the information system for forecast integral parameters of the rock massif stress-strain state and assessing the conditions for the rock destruction. The use of the designed methods, algorithms and software decreases geomechanical risks of gas-dynamic phenomenon occurrence, reduces cost of breakdown elimination and increases economical efficiency of the mining enterprises.
Numerical investigation of additional gas supply angle influence on flow in jet mill ejector
Authors: Ihnatiev Oleksandr , Shevelova Hanna , Strelnykov Hennadii , Blyuss Borys 
Published: January 2022

Abstract
The results of numerical simulation of the flow in the jet mill ejector which is equipped with an additional gas supply channel have been presented. The influence of the supply system parameters on the nature of the flow in the ejector accelerating tube has been investigated. A comparative analysis of the change in the flow structure in the ejector for different values of the additional gas flow angle has been carried out. The dependences of the flow velocity at the outlet of the accelerating tube, the ejection coefficient and the thickness of the protective layer on the angle of the additional energy carrier supply have been scrutinized. The maximum values of the average output velocities for the given ranges of the additional flow parameters have been determined. Recommendations for the choice of geometric and gas-dynamic parameters of the additional gas flow to ensure the highest efficiency of the acceleration process in the jet mill ejector have been developed. The choice of the angle of the additional gas flow supply, which provides the highest average velocity at the outlet from the accelerating tube with the highest ejection coefficient, has been substantiated.
Influence of low-frequency vibrations on mass transfer in pores
Authors: Lutsenko Vasyl , Yelisieiev Volodymyr , Sovit Yurii 
Published: January 2022

Abstract
The work is devoted to the numerical investigation of mass transfer in a narrow extended channel at small low-frequency fluid vibrations. These questions are of interest for technological processes associated with impregnation and filtration. Three different series of mass transfer problems are considered. In the first series a low velocity flow with some diffusing component was supplied through the initial section of a long thin rectangular channel. In the second series the speed fluctuation near the zero point was considered, i.e. there was no stationary component of the fluid velocity in the channel. In the third series of calculations the mass transfer was determined for the case when the dissolving substance was absorbed on the opposite wall of the channel. Calculations of mass transfer in capillary channels showed that with longitudinal oscillations of the flow in the channel, the amplitude of the velocity oscillations has the main influence while the frequencies play practically no role.
Method for determining the trajectories of particle movement in the undermined rock mass
Authors: Kodunov Boris 
Published: January 2022

Abstract
A method for determining the coordinates of particles displaced as a result of undermining a rock mass is considered, which makes it possible to pre-calculate displacements and deformations of a rock mass and the earth’s surface. When compiling a model, a rock mass is considered as a discrete layered medium of a block structure. The mined seam is divided into elementary sections, which generate zones of displacement of rocks and the earth’s surface. As a result of their addition, a common area of displacement is formed due to whole working area, and particles of rocks or the earth’s surface move, forming displacement vectors. The direction and value of these vectors can be used to define changes in the position of the original line or surface and corresponding deformations caused by these changes. Mathematical modeling of the displacement process makes it possible to establish the patterns of spatial movement of points. Comparison of the calculated trajectories of points with the results obtained during mining operations relevealed their similarity. The proposed method can be used to predict the displacements of points in the undermined rock mass during the movement of the longwall face.
Forecasting the parameters of displacement of rocks and the earth’s surface on the basis of mathematical modeling in the conditions of underground mining of gold ore deposits
Authors: Sayyidkosimov Sayyijabbor , Nizamova Albina 
Published: January 2022

Abstract
To substantiate the conditions of safe mining of the ore deposit sections of the Charmitan deposit (Zarmitan gold ore zone), the change in the stress-strain state of the rock mass has been estimated during the actual mining. In the article, researches have been carried out to solve geomechanical problems using numerical modeling based on the finite element method. Based on the performed calculation on the finite element model of the stress-strain state of the massif several sizes (62 m, 40 m and 41 m) of safety pillar have been analyzed. To compare the results obtained in the model, the calculation of the expected deformations for the protected area has been performed at the power of the safety pillar 43 m.
Economic aspects of ecological conditions at the enterprise caused by technogenic pollution
Authors: Khorolskyi Valentin , Kvitka Tatyana , Serebrenykov Vadim , Khotskina Valentina 
Published: January 2022

Abstract
Mathematical modeling of the ecological state of the enterprise at technogenic pollution is stated. It is proved that the reduction of costs for eco-modernization of the mining and metallurgical complex leads to an increase in the cost of treatment of workers. The question arises about the creation of an ecological state of the enterprise, which corresponds to the optimal profit, taking into account the restrictions associated with fabricated pollution. To assess the cost of this, an indicator is used that determines the intensity of diseases of workers per unit time depending on the concentration of harmful substances. The problem is solved by minimizing the economic criterion, taking into account the limitations. A computational experiment on a mathematical model is implemented, which confirms the results of analytical calculations. The application of similarity theory reduces the number of variables from four to two, which simplifies the analysis of the results of a computational experiment. This allows top managers of mining and metallurgical enterprises to build a system for monitoring the territory and design the eco-modernization of enterprises by 2030.
Concerning the static balance optimization for excavator SRs 2000
Authors: Nedyalkov Petko , Minin Ivan , Vrazhilski Dragomir 
Published: January 2022

Abstract
Balancing the excavator structure is a widely considered topic that directly relies on the operation, the wear of nodes connecting the upper and the lower structures of the excavator and especially on the stability of the excavator at the operational site. The present paper considers the balance of the excavator structures of the SRs 2000 excavator with idealization to some static positions and simplification of the interactions to static ones. This allows positional regard of the most used positions under operating conditions. This approach derives some dependences clarifying the static balancing of the super structure of the excavator to the undercarriage, taking into account the interactions of both the weight parameters, as of the structural units, as of the main external forces. There are derived dependences for determining the load of ballast weights during repair and modernization of excavator structures
Justification of the hydro-mechanical systems operating modes, used for restoring accumulation capacity of tailings storages
Authors: Medvedieva Olha , Semenenko Yevhen , Blyuss Borys , Skosyriev Viktor 
Published: January 2022

Abstract
The paper describes the ways to extend the service life of tailings storage facilities by restoring their accumulation capacity. Analysis of the state-of-the-art experience in tailings management is provided. Restoring is carried out due to the following: storing of waste as paste-like slurry; raising embankment; intensifying wastewater treatment process in ponds by means of coagulation agents; selection of adequate alluviation maps mode; specifying parameters of surface and underwater alluvial beaches; implementing the separate storage of solid-phase fractions; preliminary pulp clarification in alluviation maps before supplying it to the pond. Due to the long length of the hydrotransport lines, the use of paste thickeners in the mining and processing plants of Kryvbas is impossible. These technologies are implemented at new storage facilities where waste is placed in the first tier. The aim of this study is to determine and substantiate parameters of hydro-mechanical systems during the operation of tailing facilities with temporary clarifiers. The study for the first time established relationship between the temporary pond operation time. There are such parameters as concentration and consumption of slurry, initial depth of the pond filling, barrier dam height and the length of alluvial front.
Tamponage of massif by modern polymeric materials for isolating mined-out areas in the coal seams prone to spontaneous ignition
Authors: Krukovskyi Oleksandr , Kurnosov Serhii , Makeiev Serhii , Ryzhov Hennadii , Pilipenko Yurii 
Published: January 2022

Abstract
The causes of endogenous fires and methods to prevent coal spontaneous ignition were analyzed. Rational parameters of rock massif tamponage with different polymeric chemical compositions for stabilization of its stress-strain state and isolation of mine workings from methane penetration and fresh air leakage were investigated by the mine experimental methods. The dependences of the nominal pressure of injection of the chemical composition into the rock massif were established with taking into account coefficients of influence of rock type and stress concentration in the zones unloaded from rock pressure, in zones of geostatic pressure and in stress concentration zones. In order to control any accidental leaks of chemical composition through the main cracks, the stress-strain state of the rock massif in the mined area is taken into account for calculating the volume of substance to be injected. The parameters of methods for the rock massif cementation and tarring around the isolating bulkhead are substantiated. The method is developed for constructing a double isolating bulkhead in difficult mining and geological conditions to isolate the mined-out areas in the coal seams prone to spontaneous ignition.
Stress reindexation in coal seams when mining works cross zones of rupturing dislocations
Authors: Pylypenko Yurii , Konstantynova Iryna , Kliuiev Eduard , Ptak Mariusz 
Published: January 2022

Abstract
A description of the stress state of the coal seam contained tectonic disturbance with closed edges is presented. The area of the disturbance is shown in the form of an elliptical inclusion and rupturing dislocation with displaced edges. Stress state is defined as a superposition of two solutions on the reference pressure of the coal seam and zone of rupturing dislocation. Changes in the stress-strain state parameters leads to reindexation of the axes with preserving their spatial orientation. This leads to changes in geomechanical state of the coal seams and properties of coal and adjoining rocks when approaching and passing through tectonic disturbances.
Mechanically and biologically promoted cell-laden constructs generated using tissue-specific bioinks for tendon/ligament tissue engineering applications
Authors: Chae Suhun , Choi Yeong-Jin , Cho Dong-Woo 
Published: January 2022

Abstract
Tendon and ligament tissues provide stability and mobility crucial for musculoskeletal function, but are particularly prone to injury. Owing to poor innate healing capacity, the regeneration of mature and functional tendon/ligament (T/L) poses a formidable clinical challenge. Advanced bioengineering strategies to develop biomimetic tissue implants are highly desired for the treatment of T/L injuries. Here, we presented a cell-based tissue engineering strategy to generate cell-laden tissue constructs comprising stem cells and tissue-specific bioinks using 3D cell-printing technology. We implemented an in vitro preconditioning approach to guide semi-organized T/L-like formation before the in vivo application of cell-printed implants. During in vitro maturation, tissue-specific decellularized extracellular matrix-based cellular constructs facilitated long-term in vitro culture with high cell viability and promoted tenogenesis with enhanced cellular/structural anisotropy. Moreover, we demonstrated improved cell survival/retention upon in vivo implantation of pre-matured constructs in nude mice with de novo tendon formation and improved mechanical strength. Although in vivo mechanical properties of the cell-printed implants were lower than those of human T/L tissues, the results of this study may have significant implications for future cell-based therapies in tendon and ligament regeneration and translational medicine.
Transparent superhydrophobic film with anti-fouling and anti-scaling ability by facile method of dip-coating SiO2 Sol
Authors: Feng Xiaojuan , Shi Yanlong , Yin Xuelong , Wang Xue 
Published: January 2022

Abstract
In the past decades, the studies of materials with transparency and durable superhydrophobicity have captured much attention because of the versatile uses in outdoor glass wall, automobile windshield and solar panel. In this paper, a superhydrophobic and transparent SiO2 film with transmittance over 44% was obtained on glass substrate with a facile method of dip-coating without further modification. The contact angle and sliding angle of water droplet on the superhydrophobic film is 163.1° and 4°, respectively. The results reveal the performance of superhydrophobicity originates from the synergistic effects of rough SiO2 structures and hydrophobic alkyl with low surface energy. The SiO2 coating exhibits self-cleaning ability, anti-fouling property and anti-scaling performances. Furthermore, the SiO2 coatings have good thermal stability and resistance ability to acid and base. The techniques adopted here have the advantage of simple process, low cost and fluorine-free treatment, which may provide an useful reference for the preparation of transparent and superhydrophobic film in practice.
Exponential optical absorption edge in PbS quantum dot-ligand systems on single crystal rutile-TiO2 revealed by photoacoustic and absorbance spectroscopies
Authors: Toyoda Taro , Shen Qing , Nakazawa Naoki , Yoshihara Yasuha , Kamiyama Keita , Hayase Shuzi 
Published: January 2022

Abstract
The photovoltaic properties of quantum dot (QD) sensitized solar cells (QDSCs) depend significantly on the surface modification applied to the QDs and on the nanostructured interface between the QDs and the electrode surface. In the development of QDSCs with spatially ordered QD arrays, linking molecular ligands with the QDs (QD-ligands) can lead to the realization of novel QDSCs. The ligand shell around the QDs mediates the electron and energy transfer processes that underpin their use in QDSC applications. The dependence of the photovoltaic properties on the interparticle distance (QD spacing) can also be evaluated by applying different sizes of molecular ligands. The present study focuses on specific attention to the exponential optical absorption edge (often termed Urbach tail) in PbS QD-ligand systems with different QD spacing adsorbed on rutile-TiO2 (R-TiO2) substrates with different crystal orientations. It is essential to accurately characterize QD-ligands on electrode surfaces with different crystal orientations, not only for scientific studies, but to further optimize the growth conditions and processes in order to design and fabricate advanced QDSCs. Photoacoustic (PA) and conventional absorbance (Abs) spectroscopies were applied to determine the optical absorption and nonradiative relaxation properties. There is a discrepancy between the PA and Abs spectra especially in the Urbach tail region. As the Urbach tail states are related to the absorbed photon energy lost in the form of heat generated by nonradiative relaxation, therefore characterization of the Urbach tail is important and essential for QDSC applications. Characterization of the Urbach tail and the heat generated by nonradiative relaxation of PbS QD-ligand systems by combined PA and Abs spectroscopies showed that the characteristics depend strongly on the crystal orientation of the R-TiO2 substrate, the QD spacing, and the free energy change.
Non-perturbative renormalization for the neural network-QFT correspondence
Authors: Erbin H , Lahoche V , Ousmane Samary D 
Published: January 2022

Abstract
In a recent work (Halverson et al 2021 Mach. Learn.: Sci. Technol.
2 035002), Halverson, Maiti and Stoner proposed a description of neural networks (NNs) in terms of a Wilsonian effective field theory. The infinite-width limit is mapped to a free field theory while finite N corrections are taken into account by interactions (non-Gaussian terms in the action). In this paper, we study two related aspects of this correspondence. First, we comment on the concepts of locality and power-counting in this context. Indeed, these usual space-time notions may not hold for NNs (since inputs can be arbitrary), however, the renormalization group (RG) provides natural notions of locality and scaling. Moreover, we comment on several subtleties, for example, that data components may not have a permutation symmetry: in that case, we argue that random tensor field theories could provide a natural generalization. Second, we improve the perturbative Wilsonian renormalization from Halverson et al (2021 Mach. Learn.: Sci. Technol.
2 035002) by providing an analysis in terms of the non-perturbative RG using the Wetterich-Morris equation. An important difference with usual non-perturbative RG analysis is that only the effective infrared 2-point function is known, which requires setting the problem with care. Our aim is to provide a useful formalism to investigate NNs behavior beyond the large-width limit (i.e. far from Gaussian limit) in a non-perturbative fashion. A major result of our analysis is that changing the standard deviation of the NN weight distribution can be interpreted as a renormalization flow in the space of networks. We focus on translations invariant kernels and provide preliminary numerical results.