bluuebunny/crossref_metadata_2025_split huggingface dataset:
A supranational solidaristic space? Comparative appraisal of determinants of individual support for European solidarity in the COVID-19 era
Authors: Russo Luís 
Published: April 2023

AbstractCOVID-19 created profound shockwaves across the Union, pushing supranational crisis policymaking to the forefront of European politics and fostering an unprecedented expansion in fiscal solidarity with which to support the economic recovery ahead. This development lends pertinence to a contemporary reappraisal of the main determinants underlying individual support for European solidarity and its implications to the consolidation of a political basis for a supranational solidaristic space. Using an original large-N survey dataset and employing a fixed-effects linear regression analysis, this paper empirically reviews ideal-type theoretical predictions for individual support for European solidarity by conducting a comparative assessment of their correlates' explanatory power in the new pandemic context. First, I contend individuals reason in supranational terms as key political attitudes driving individual support for cross-border solidarity are informed directly at the supranational level, consubstantiating the claim that European redistribution operates as a distinct legitimate space for solidarity in its own right. Second, I argue that utilitarian motivations linked to expectations of material amelioration are better predictors of support for solidarity than cultural explanations emphasising national identity or attitudes towards immigration. Third, I suggest that preferences concerning European solidarity are better captured by political divides over economic redistribution rather than over cultural concerns, but only among more cosmopolitan-oriented individuals. In any event, cultural factors are still relevant predictors of support for solidarity, particularly among nationalists. The final section interprets these findings by discussing how the correspondence between public expectations and institutional supply of supranational redistributive instruments to respond to the pandemic may contribute to strenghten political support for European solidarity and the EU polity itself.
Broadband phase-modulated metasurface based on vanadium dioxide patches in microwave band
Authors: Ma Y. L. , Wan W. P. , Wang Z. B. , Chen Q. , Zheng Y. J. , Guo T. T. , Shuai C. Y. , Fu Y. Q. 
Published: April 2023

Phase-modulated metasurfaces (PMMs) have attracted considerable attention because of their widespread application in many fields. However, the most existing PMMs are only available in a relatively narrow band. In this paper, we propose a design of a broadband PMM based on vanadium dioxide (VO2) patches. The unit cell of the proposed PMM is composed of a surface layer supported by a 0.5 mm F4B with a dielectric constant of εr = 2.65, and a dielectric layer with a metal ground on its back. The surface layer consists of two opposite T-shaped metal patches connected by a VO2 patch. The VO2 patch can be used as an active element due to the insulator-to-metal transition of VO2. The process of phase transition is achieved by direct heating with a heating plate, without additional feeders affecting the performance of the PMM. The designed PMM can achieve a broadband phase difference within 180° ± 37° from 6.94 to 20.84 GHz, with a fractional bandwidth of 100%. Both full wave simulation and measurement results show that the proposed metasurface presents a good phase reconstruction performance over a wideband frequency range.
Non-volatile logic-in-memory ternary content addressable memory circuit with floating gate field effect transistor
Authors: Cho Sangki , Kim Sueyeon , Choi Insoo , Kang Myounggon , Baik Seungjae , Jeon Jongwook 
Published: April 2023

Due to the limitations of the currently widely used von Neumann architecture-based computing system, research on various devices and circuit systems suitable for logic-in-memory computing applications has been conducted. In this work, the silicon-based floating gate memory cell transistor structure, which has been attracting attention as a memory to replace the dynamic random access memory or NAND Flash technology, was newly recalled, and its applicability to logic-in-memory application was confirmed. This floating gate field effect transistor (FGFET) has the advantage that the compatibility of the existing silicon-based complementary metal–oxide–semiconductor (CMOS) process is far superior to that of logic-in-memory application devices to which materials with new memory characteristics are applied. At the 32 nm technology node, which is the front node to which the planar MOSFET structure is applied, an analysis environment that can simultaneously analyze the device and circuit of the FGFET was established. For a seamless connection between FGFET-based devices and circuit analysis, the compact model of the FGFET was developed, which is applied to logic-in-memory ternary content addressable memory (TCAM) circuit design. It was verified that the two types of logic-in-memory TCAM circuits to which FGFETs are applied are superior to a conventional CMOS FET-based TCAM circuit in the number of devices used (=circuit area) and power/energy efficiency.
Simulating noisy quantum channels via quantum state preparation algorithms
Authors: Zanetti Marcelo S , Pinto Douglas F , Basso Marcos L W , Maziero Jonas 
Published: April 2023

AbstractIn Xinet al(2017Phys. Rev.A96062303) and Weiet al(2018Sci. China Phys. Mech. Astron.6170311), the authors reported an algorithm to simulate, in a circuit-based quantum computer, a general quantum channel (QC). However, the application of their algorithm is limited because it entails the solution of intricate non-linear systems of equations in order to obtain the quantum circuit to be implemented for the simulation. Motivated by this issue, in this article we identify and discuss a simple way to implement the simulation of QCs on anyd-level quantum system through quantum state preparation algorithms, that have received much attention in the quantum information science literature lately. We exemplify the versatility of our protocol applying it to most well known qubit QCs, to some qudit QCs, and to simulate the effect of Lorentz transformations on spin states. We also regard the application of our protocol for initial mixed states. Most of the given application examples are demonstrated using IBM’s quantum computers.
Rogue wave solutions of (3+1)-dimensional Kadomtsev-Petviashvili equation by a direct limit method
Authors: Sun Yujie , Wu Jiaojiao , Li Biao 
Published: April 2023

Abstract
On the bases of N-soliton solutions of Hirota’s bilinear method, high-order rogue wave solutions can be derived by a direct limit method. In this paper, a (3+1)-dimensional Kadomtsev-Petviashvili equation is taken to illustrate the process of obtaining rogue waves, that is, based on the long-wave limit method, rogue wave solutions are generated by reconstructing the phase parameters of N-solitons. Besides the fundamental pattern of rogue waves, the triangle or pentagon patterns are also obtained. Moreover, the different patterns of these solutions are determined by newly introduced parameters. In the end, the general form of N-order rogue wave solutions are proposed.
The Year-scale X-Ray Variations in the Core of M87
Authors: Cheng Yu-Lin , Xiang Fei , Yu Heng , Jia Shu-Mei , Li Xiang-Hua , Li Cheng-Kui , Chen Yong , Feng Wen-Cheng 
Published: April 2023

Abstract
The analysis of light variation of M87 can help us understand the disk evolution. In the past decade, M87 has experienced several short-term light variabilities related to flares. We also find that there are year-scale X-ray variations in the core of M87. Their light variability properties are similar to clumpy-ADAF. By re-analyzing 56 Chandra observations from 2007 to 2019, we distinguish the “non-flaring state” from “flaring state” in the light variability. After removing flaring state data, we identify four gas clumps in the nucleus and all of them can be well fitted by the clumpy-ADAF model. The average mass accretion rate is ∼0.16M
⊙ yr−1. We analyze the photon index (Γ)–flux (2–10 keV) correlation between the non-flaring state and flaring state. For the non-flaring states, the flux is inversely proportional to the photon index. For the flaring states, we find no obvious correlation between the two parameters. In addition, we find that the flare always occurs at a high mass accretion rate, and after the luminosity of the flare reaches the peak, it will be accompanied by a sudden decrease in luminosity. Our results can be explained as that the energy released by magnetic reconnection destroys the structure of the accretion disk, thus the luminosity decreases rapidly and returns to normal levels thereafter.
Probing the Internal Physics of Neutron Stars through the Observed Braking Indices and Magnetic Tilt Angles of Several Young Pulsars
Authors: Hu Fang-Yuan , Cheng Quan , Zheng Xiao-Ping , Wang Jia-Qian , Yan Yu-Long , Wang Jia-Yu , Luo Tian-Yu 
Published: April 2023

Abstract
The braking indices of pulsars may contain important information about the internal physics of neutron stars (NSs), such as neutron superfluidity and internal magnetic fields. As a subsequent paper of Cheng et al., we perform the same analysis as that done in the previous paper to other young pulsars with a steady braking index, n. Combining the timing data of these pulsars with the theory of magnetic field decay, and using their measured magnetic tilt angles, we can set constraints on the number of precession cycles, ξ, which represents the interactions between superfluid neutrons and other particles in the NS interior. For the pulsars considered in this paper, the results show that ξ is within the range of a few ×103 to a few ×106. Interestingly, for the Crab and Vela pulsars, the constraints on ξ obtained with our method are generally consistent with that derived from modeling of the glitch rise behaviors of the two pulsars. Furthermore, we find that the internal magnetic fields of pulsar with n < 3 may be dominated by the toroidal components. Our results may not only help to understand the interactions between the superfluid neutrons and other particles in the interior of NSs but also be important for the study of continuous gravitational waves from pulsars.
Neutrino Mass Constraints from Reconstructing the Large-scale Structure: Systematic Uncertainty
Authors: Chung Chok Lap , Inman Derek , Wang Xin , Shang Erhao , Zhuang Zi , Yuan Fucheng , Pen Ue-Li 
Published: April 2023

Abstract
We examine the possibility of applying the baryonic acoustic oscillation reconstruction method to improve the neutrino mass Σm

ν
constraint. Thanks to the Gaussianization of the process, we demonstrate that the reconstruction algorithm could improve the measurement accuracy by roughly a factor of two. On the other hand, the reconstruction process itself becomes a source of systematic error. While the algorithm is supposed to produce the displacement field from a density distribution, various approximations cause the reconstructed output to deviate on intermediate scales. Nevertheless, it is still possible to benefit from this Gaussianized field, given that we can carefully calibrate the “transfer function” between the reconstruction output and theoretical displacement divergence from simulations. The limitation of this approach is then set by the numerical stability of this transfer function. With an ensemble of simulations, we show that such systematic error could become comparable to statistical uncertainties for a DESI-like survey and be safely neglected for other less ambitious surveys.
Substantiating parameters of short-delay blasting and seismic safety while constructing the inclined tunnel
Authors: Petrenko Volodymyr , Bondarenko Nataliia , Miroshnyk Vitalii , Burskyi Maksym , Konoval Volodymyr 
Published: April 2023

Abstract
Implementation of blasting works in mining engineering and underground construction requires new effective blasting technologies in conducting an explosion. Short-delay blasting is a technology that requires scientific substantiation of its parameters. The application of explosion technology with increased blast intervals between charges is characterized as successful. However, the degree of reduction of seismic action and, accordingly, an increase in seismic safety needs clarification of the parameters of short-delay blasting. The scientific paper analyzes the delay time of the blast of charges and the classification of the degree of damage to buildings and structures. Seismic safety parameters for the inclined tunnel “Skhidnyi” while tunneling at the quarry of the Inhulets Ore Mining and Processing Plant (in the city of Kryvyi Rih) have been substantiated. The functional dependence of the maximum vibration velocity on the seismically safe distance has been obtained, as well as the dependence of the coefficient, the value of which characterizes the mass of the explosive. This allows for a quick evaluation of seismic safety parameters when calculating the parameters of blasting operations in the case of short-delay blasting.
Results of research on the stability of mine workings, fixed by arched supports made of composite materials, in the conditions of the Pokrovske Mine Administration
Authors: Bondarenko Volodymyr , Kovalevska Iryna , Sheka Ivan , Sachko Roman 
Published: April 2023

Abstract
The paper provides a detailed analysis of innovative technologies for maintaining mine workings at great depths. The possibility of using composite materials (in particular, carbonfiber-reinforced plastic) as fastening elements is of special attention. It has been conducted a comparative analysis of the physical-mechanical properties of carbon fiber-reinforced plastic and low-alloy steel, traditionally used for the manufacture of frame support. To conduct a comparative analysis of the stress-strain state, a series of models has been developed and computer modelling has been performed by the finite element method using the Ansys Mechanical software product. In mining-geological conditions Pokrovske Mine Administration, three types of supports, namely, basic, composite with variable section and composite with constant section, have been studied. The initial and boundary conditions, as well as the assumptions and idealization of the model, have been substantiated. A comparative analysis of the stress intensity confirms the advantage of the proposed frame supports made of composite materials in terms of limiting the zones with maximum values. Laboratory research, conducted on a 3D-printer, testifies to the adequacy of conducted modelling. The reliability of the obtained values makes it possible to recommend an innovative support using carbon fiber-reinforced plastic for conducting a mine experiment.
Fuzzy logic methods for risk management at mining enterprises
Authors: Slashchova Olena , Yalanskyi Oleksii , Slashchov Ihor , Kurinnyi Volodymyr , Kulbach Andrii 
Published: April 2023

Abstract
To prevent emergencies at mining enterprises, a model of controlling stability of geotechnical system by fuzzy logic methods was developed based on the data fuzzification, inference and defuzzification. The main principles were formulated for the identification of specific features of dangerous production facilities in mining industry. To determine the input parameters for the fuzzy logic model, the systematization of uncontrolled (mining and geological) and controlled (technical and technological) parameters, the presence or change of which affects the stability of the rock massif and roadways, was carried out. The application of such methods as aggregation, implication, defuzzification was substantiated for processing input signals. An algorithm of fuzzy logic inference was formed to control parameters of a geotechnical system. The model differs by its ability to adapt to the specifics of controlling the geotechnical system “support - rock massif” and to select logical rules depending on the established criteria.
Drones as elements of remote control of the state of geophysical objects
Authors: Ihor Krasovskyi 
Published: April 2023

Abstract
Control of the state of geophysical objects is one of the key components of their further safe operation. But some geophysical objects have areas that cannot be successfully inspected for various reasons. Such missed areas can be in critical condition and significantly affect the final results of the examination. It is possible to solve this issue by implementing methods and means of remote operational non-destructive control of the state of geophysical objects. One such solution is implementation of unmanned aerial vehicles, commonly known as drones. The goal of the work is to find out the possibility of using drones as an element of remote control of the state of geophysical systems in order to eliminate inaccessible areas during the inspection of both on-ground and underground objects and to establish the key parameters of drones for their implementation in the specified role. Drones and areas of their application were used as objects for this research. Two categories of remote control of the state of geophysical objects by drones were defined, followed by technical requirements for drones for each category.
The use of steel and injection rock bolts to support mine workings when crossing tectonic faults
Authors: Krukovskyi Oleksandr , Krukovska Viktoriia , Kurnosov Serhii , Demin Vladimir , Korobchenko Vladyslav , Zerkal Volodymyr 
Published: April 2023

Abstract
Using the method of numerical modeling, the stability of mine working under difficult conditions of crossing a tectonic fault was studied as well as effectiveness of using steel rock bolts in combination with injection rock bolts. It was shown that steel and injection rock bolts complemented each other very well, increasing the stability of the mine working and reducing permeability of the host rocks. Injection rock bolts exclude the possibility of destruction of host rocks and more effectively reduce permeability of disturbed rocks in the zone of the tectonic fault. At the same time, steel rock bolts better restrain the expansion of the zone of high difference of the stress tensor components. Therefore, in case of heavily watered rocks or a high probability of methane breakthroughs into the mine working, it is better to install injection rock bolts as close to the mine face as possible. Then a water- and gas-proof shell arch around the mine working will be created in the immediate vicinity of the mine face. If there is no such threat and the priority is to maintain the long-term stability of the mine working, then first of all it is necessary to install steel bolts.
Statistical analysis of Samara River pollution impact on the population morbidity rate in Western Donbas (Ukraine)
Authors: Kovrov Oleksandr , Kulikova Daria , Pavlychenko Artem 
Published: April 2023

Abstract
The anthropogenic load on natural environment has reached a level that threatens the population health. The main causes of water sources pollution are the discharge of untreated or insufficiently treated wastewaters by industrial enterprises. These and other reasons lead to the spread of various types of diseases among the population. A cause-and-effect relationship between the qualitative and quantitative state of the surface waters of the Samara River and certain diseases of the population living in the Western Donbas region has been established. The method of statistical analysis based on Pearson correlation has been applied. Reliable correlation between the pollutants content in surface waters of Samara River and the increase of the population diseases in the investigated territory has been proven. With high degree of probability, the following diseases are closely related to water quality: diseases of the blood, hematopoietic organs and disorders of immune system; diseases of endocrine system, digestive and metabolic disorders; circulatory system and digestion diseases; diseases of the skin and subcutaneous tissues. The obtained results indicate the need for further research taking into consideration the regional specificity of conditions and factors of environmental pollution, development of advanced water treatment to reduce the morbidity rate of the population.
New working fluids for the use of heat secondary sources in mining technologies
Authors: Kirsanov Mykhailo , Gupalo Olena , Podoliak Kostiantyn 
Published: April 2023

Abstract
Production cost of mining enterprises can be significantly reduced when using secondary heat. A large volume of secondary heat sources has a temperature potential of no higher than 50°C. To generate additional electricity using secondary heat it has been proposed to use installations with the Rankine thermodynamic cycle in mining enterprises. The paper aim is to study the thermodynamic efficiency of using R-1234yf and R-744 in the equipment, which uses the secondary heat of mining technologies for evaporation of these working fluids. R-1234yf is a freon that belongs to the class of hydrofluoroolefins and has a much lower level of global warming potential than other ozone-depleting substances. R-744 is carbon dioxide, which belongs to a natural, non-toxic and non-flammable working substance. It has been determined that the thermodynamic efficiencies of using R-1234yf and R-744 are 10% and 6.3%, respectively. The thermodynamic efficiency has been calculated for the temperature range from 50° to 20°C, which is typical for a large volume of secondary heat sources in mining technologies.
Enhancement of the quality of marketable iron ore products of Kryvyi Rih iron ore basin
Authors: Stupnik Mykola , Oliinyk Tetiana , Pochtarev Alexey , Kalinichenko Olena , Kalinichenko Vsevolod 
Published: April 2023

Abstract
The main indicators of the iron ore quality are the content of iron, silica, phosphorus and other components. It is ascertained that the quality of ore depends on its grain-size composition. The article proves that when crushing 16-0 mm fraction ore to 5-0 mm, Fe content is reclassified by sizes due to liberation of both martite and hematite at this grain size. To reduce energy consumption during grinding, it is recommended to install high pressure grinding rolls for crushing the 16-1 mm fraction and consider this operation as the first stage of grinding. Martite liberation in the -1.0+0.0 mm material shows that significant predominance (87.0 vs. 13.0%) of free grains over aggregates is observed in the -0.071+0.05 mm fraction material. Free martite aggregates make 57.12% in the -0.16+0.071 mm material. Complete (100%) liberation of martite is observed in the -0.05 mm material. Sieve analysis of the A56 sinter ore sample crushed to 5-0 mm in the industrial roll crusher enables ascertaining that the greatest increase in recovery (Fetot = 60.05%) of sinter ore occurs at the -0.16+0.071 mm grain size.