bluuebunny/crossref_metadata_2025_split huggingface dataset:
Plausibility of ultraviolet burst generation in the low solar chromosphere
Authors: Ni Lei , Cheng Guanchong , Lin Jun 
Published: June 2022

Context.Ultraviolet (UV) bursts and Ellerman bombs (EBs) are small-scale magnetic reconnection events taking place in the highly stratified, low solar atmosphere. The plasma density, reconnection mechanisms, radiative cooling and transfer processes clearly differ from one layer of the atmosphere to the next. In particular, EBs are believed to form in the upper photosphere or the low chromosphere. It is still not clear whether UV bursts have to be generated at a higher atmospheric layer than the EBs or whether both UV bursts and EBs can occur in the low chromosphere.Aims.We numerically studied the lowβmagnetic reconnection process around the solar temperature minimum region (TMR) by including more realistic physical diffusions and radiative cooling models. We aim to find out whether UV bursts may occur in the low chromosphere and to investigate the dominant mechanism that accounts for heating in the UV burst in the chromosphere.Methods.We used the single-fluid magnetohydrodynamic (MHD) code NIRVANA to perform the simulations. The time-dependent ionization degrees of hydrogen and helium are included in the code, which lead to a more realistic magnetic diffusion caused by electron-neutral collision and ambipolar diffusion. A more realistic radiative cooling model is also included in the simulations. The initial mass density and temperature are 1.66057 × 10−6kg m−3and 4400 K, respectively, values that are typical for the plasma environment around TMR.Results.Our results in high resolution indicate that the plasmas in the reconnection region are heated up to more than 20 000 K if the reconnecting magnetic field is as strong as 500 G, which suggests that UV bursts can be generated in the dense low chromosphere. The dominant mechanism for producing the UV burst in the low chromosphere is heating, as a result of the local compression in the reconnection process. The thermal energy occurring in the reconnection region rapidly increases after the turbulent reconnection mediated by plasmoids is invoked. The average power density of the generated thermal energy in the reconnection region can reach over 1000 erg cm−3s−1, which is comparable to the average power density accounting for a UV burst. With the strength of the reconnecting magnetic field exceeding 900 G, the width of the synthesized Si IV 1394 Å line profile with multiple peaks can reach up to 100 km s−1, which is consistent with observations.
Blanco DECam Bulge Survey (BDBS)
Authors: Marchetti Tommaso , Johnson Christian I. , Joyce Meridith , Rich R.Michael , Simion Iulia T. , Young Michael D. , Clarkson William , Pilachowski Catherine A. , Michael Scott , Kunder Andrea , Koch-Hansen Andreas J. 
Published: June 2022

Aims.The Blanco DECam Bulge Survey (BDBS) has imaged more than 200 square degrees of the southern Galactic bulge, providing photometry in theugrizyfilters for ∼250 million unique stars. The presence of a strong foreground disk population, along with complex reddening and extreme image crowding, has made it difficult to constrain the presence of young and intermediate age stars in the bulge population.Methods.We employed an accurate cross-match of BDBS with the latest data release (EDR3) from theGaiamission, matching more than 140 million sources with BDBS photometry andGaiaEDR3 photometry and astrometry. We relied onGaiaEDR3 astrometry, without any photometric selection, to produce clean BDBS bulge colour-magnitude diagrams (CMDs).Gaiaparallaxes were used to filter out bright foreground sources, and a Gaussian mixture model fit to Galactic proper motions could identify stars kinematically consistent with bulge membership. We applied this method to 127 different bulge fields of 1 deg2each, with |ℓ| ≤ 9.5° and −9.5° ≤b ≤ −2.5°.Results.The astrometric cleaning procedure removes the majority of blue stars in each field, especially near the Galactic plane, where the ratio of blue to red stars is ≲10%, increasing to values ∼20% at higher Galactic latitudes. We rule out the presence of a widespread population of stars younger than 2 Gyr. The vast majority of blue stars brighter than the turnoff belong to the foreground population, according to their measured astrometry. We introduce the distance between the observed red giant branch bump and the red clump as a simple age proxy for the dominant population in the field, and we confirm the picture of a predominantly old bulge. Further work is needed to apply the method to estimate ages to fields at higher latitudes, and to model the complex morphology of the Galactic bulge. We also produce transverse kinematic maps, recovering expected patterns related to the presence of the bar and of the X-shaped nature of the bulge.
Dust emissivity in resolved spiral galaxies
Authors: Bianchi Simone , Casasola Viviana , Corbelli Edvige , Galliano Frédéric , Magrini Laura , Nersesian Angelos , Salvestrini Francesco , Baes Maarten , Cassarà Letizia P. , Clark Christopher J. R. , De Looze Ilse , Jones Anthony P. , Madden Suzanne C. , Mosenkov Aleksandr , Ysard Nathalie 
Published: June 2022

Context. The far-infrared (FIR) and sub-millimeter (submm) emissivity, ϵν, of the Milky Way (MW) cirrus is an important benchmark for dust grain models. Dust masses in other galaxies are generally derived from the FIR/submm using the emission properties of these MW-calibrated models.
Aims. We seek to derive the FIR/submm ϵν in nine nearby spiral galaxies to check its compatibility with MW cirrus measurements.
Methods. We obtained values of ϵν at 70–500 μm, using maps of dust emission from the Herschel satellite and of gas surface density from the THINGS and HERACLES surveys on a scale generally corresponding to 440 pc. We studied the variation of ϵν with the surface brightness ratio Iν(250 μm)/Iν(500 μm), a proxy for the intensity of the interstellar radiation field heating the dust.
Results. We find that the average value of ϵν agrees with MW estimates for pixels sharing the same color as the cirrus, namely, for Iν(250 μm)/Iν(500 μm)=4.5. For Iν(250 μm)/Iν(500 μm)> 5, the measured emissivity is instead up to a factor ∼2 lower than predicted from MW dust models heated by stronger radiation fields. Regions with higher Iν(250 μm)/Iν(500 μm) are preferentially closer to the galactic center and have a higher overall (stellar+gas) surface density and molecular fraction. The results do not depend strongly on the adopted CO-to-molecular conversion factor and do not appear to be affected by the mixing of heating conditions.
Conclusions. Our results confirm the validity of MW dust models at low density, but are at odds with predictions for grain evolution in higher density environments. If the lower-than-expected ϵν at high Iν(250 μm)/Iν(500 μm) is the result of intrinsic variations in the dust properties, it would imply an underestimation of the dust mass surface density of up to a factor ∼2 when using current dust models.
The calcium signaling module CaM–IQM destabilizes IAA–ARF interaction to regulate callus and lateral root formation
Authors: Zhang Shiqi , Yu Ruixue , Yu Dongxue , Chang Pengjie , Guo Shiqi , Yang Xiaona , Liu Xinchun , Xu Chongyi , Hu Yuxin 
Published: June 2022

Induction of a pluripotent cell mass, called callus, from detached organs is an initial step in in vitro plant regeneration, during which phytohormone auxin-induced ectopic activation of a root developmental program has been shown to be required for subsequent de novo regeneration of shoots and roots. However, whether other signals are involved in governing callus formation, and thus plant regeneration capability, remains largely unclear. Here, we report that the
Arabidopsis
calcium (Ca
2+
) signaling module CALMODULIN IQ-MOTIF CONTAINING PROTEIN (CaM–IQM) interacts with auxin signaling to regulate callus and lateral root formation. We show that disruption of IQMs or CaMs retards auxin-induced callus and lateral root formation by dampening auxin responsiveness, and that CaM–IQM complexes physically interact with the auxin signaling repressors INDOLE-3-ACETIC ACID INDUCIBLE (IAA) proteins in a Ca
2+
-dependent manner. We further provide evidence that the physical interaction of CaM6 with IAA19 destabilizes the repressive interaction of IAA19 with AUXIN RESPONSE FACTOR 7 (ARF7), and thus regulates auxin-induced callus formation. These findings not only define a critical role of CaM–IQM-mediated Ca
2+
signaling in callus and lateral root formation, but also provide insight into the interplay of Ca
2+
signaling and auxin actions during plant regeneration and development.
High-resolution Solar Image Reconstruction Based on Non-rigid Alignment
Authors: Liu Hui , Jin Zhenyu , Xiang Yongyuan , Ji Kaifan 
Published: June 2022

Abstract
Suppressing the interference of atmospheric turbulence and obtaining observation data with a high spatial resolution are an issue to be solved urgently for ground observations. One way to solve this problem is to perform a statistical reconstruction of short-exposure speckle images. Combining the rapidity of Shift-Add and the accuracy of speckle masking, this paper proposes a novel reconstruction algorithm-NASIR (Non-rigid Alignment based Solar Image Reconstruction). NASIR reconstructs the phase of the object image at each frequency by building a computational model between geometric distortion and intensity distribution and reconstructs the modulus of the object image on the aligned speckle images by speckle interferometry. We analyzed the performance of NASIR by using the correlation coefficient, power spectrum, and coefficient of variation of intensity profile in processing data obtained by the NVST (1 m New Vacuum Solar Telescope). The reconstruction experiments and analysis results show that the quality of images reconstructed by NASIR is close to speckle masking when the seeing is good, while NASIR has excellent robustness when the seeing condition becomes worse. Furthermore, NASIR reconstructs the entire field of view in parallel in one go, without phase recursion and block-by-block reconstruction, so its computation time is less than half that of speckle masking. Therefore, we consider NASIR is a robust and high-quality fast reconstruction method that can serve as an effective tool for data filtering and quick look.
Using capillarimetry to assess the tortuosity of reservoir rocks
Authors: Akhmetov R T , Malyarenko A M , Kuleshova L S , Mukhametshin V V , Safiullina A R 
Published: June 2022

Abstract
The use of a dumbbell void model is adequate for quantifying hydraulic tortuosity from reservoir parameters. The dumbbell model of the void space involves the alternation of filtering channels of the rock with pores (macrocapillaries) and interporeal constrictions (microcapillaries). Hydraulic tortuosity is physically explained by the expansion of the flow lines of the filtration flow in the pores and contraction in the interporeal tubules. Residual water is confined mainly to clay particles that line the pore channels. Since the residual water is immobile, it leads to a narrowing of the open area of the pores and, consequently, to a specific decrease in hydraulic tortuosity.
Pulsator for cleaning from asphaltene-resin-paraffin deposits
Authors: Zaripova L M , Gabdrakhimov M S 
Published: June 2022

Abstract
One of the factors that reduce labor productivity in the oil industry is the paraffinization of downhole equipment, oilfield pipes, pumps, oil collection and treatment equipment. The preventing paraffinization issue of field equipment is becoming increasingly essential. Complications caused by paraffin deposits lead to disruption of the normal operation of pumping units, metering devices, water separators, and reservoirs.
Digital filtering based on fast theoretical and numerical transformations for 5G systems
Authors: Kalmykov I A , Mukhametshin V Sh , Tyncherov K T , Selivanova M V 
Published: June 2022

Abstract
Currently, a trend to increase the performance of wireless data transmission systems can be observed. This requires a new protocol for mobile communications. The draft IMT-2020 standard involves the use of promising 5G mobile networks. These systems must have characteristics that will exceed 4G standards. New technologies will provide a higher data rate and minimal network delays, which should not exceed 1 ms. To achieve these goals, the 5G standard involves the broadband transmission using FBMC (Filter Bank MultiCarrier) or UFMC (Universal Filtered MultiCarrier). Studies have shown that the UFMC method allows for better subcarrier filtration compared to FBMC comb filtration. However, the use of this method requires high computational costs, which negatively affects the speed of information transfer and network delays. Therefore, the aim of the article is to reduce network delays when using the technology of filtering UFMC signals by using a fast algorithm for performing theoretical and numerical transformations (TNT). Therefore, the development of a fast algorithm for performing theoretical and numerical signal transformations for OFDM systems that support the 5G standard is an urgent task
Comparative analysis of algorithms for estimating traffic parameters in corporate multiservice communication networks
Authors: Ageev S A , Ageeva N S , Grachev A S , Karetnikov V V 
Published: June 2022

AbstractAdequate management of modern corporate communication networks is possible if many control procedures function in near real time. In this case, the processed network monitoring data must have accurate characteristics sufficient for making objective management decisions. This fully applies to the data monitoring of network traffic parameters, which determines the relevance of the proposed work. The proposed in the paper algorithm for on-line estimation of traffic parameters in corporate multiservice communication networks is based on the concept of conditional nonlinear Pareto-optimal filtering V. C. Pugachev. Its essence is that the estimation of traffic parameters is performed in two stages - in the first stage, we evaluate the forecast values of parameters, and in the second, with the next observations of random sequences, we make adjustments to their values. Traffic parameter values forecasts are constructed in a small-sized sliding window, and the adjustment is implemented on the basis of pseudo-gradient procedures whose parameters are adjusted using a fuzzy control algorithm based on the Takagi-Sugeno method. The proposed algorithm belongs to the class of adaptive algorithms with prior learning. The maximum value of the average relative error of estimation of traffic parameters was less than 8.2%, which is a sufficient value for the implementation of operational network management tasks. At the same time, the actual scientific and technical task is to analyze the comparison of the characteristics of the developed adaptive algorithm with the characteristics of the optimal algorithms, the characteristics of which are the maximum achievable. Translated with www.DeepL.com/Translator (free version). The results of a comparison of the proposed method with the optimal Coleman filtration (OKF) are presented.
Low frequency hydraulic hammer for wave action of injection wells
Authors: Zaripova L M , Gabdrakhimov M S 
Published: June 2022

Abstract
The deposition of salts, iron sulfide, precipitating from solutions as a result of disturbance of thermodynamic equilibrium, occurs during operation in the near-wellbore zone (NWBZ). Efficiency of field development, production rates of operating wells, injectivity of wells and the fraction of reservoir energy that can be used to lift fluid directly in the well significantly depends on the state of the bottom well formation zone (BWFZ). It is required to implement measures to influence NWBZ in order to reduce filtration resistance, to increase permeability, improve connectivity with the wellbore, and increase the system of fractures or channels to facilitate inflow and reduce energy losses in this limited formation area. The structural diagram and dynamics of the vibrator are revealed in the paper to accomplish the given tasks.
Evaluation of the degree of abrasive particles activity in oil of machine units involved in the wear process of toothed wheels
Authors: Irgashev A , Irgashev B A , Aliyorov A B 
Published: June 2022

Abstract
This article discusses the regularities of changes in the activity of abrasive particles in the oil of machine units participating in the process of gear-wheel wear at constant and increasing concentrations. They vary depending on the number of loading cycles of gear teeth, considering the share of crushed abrasive particles in one loading cycle of the gear teeth. This makes it possible to obtain regularities in the change of concentrations of active abrasive particles in the oil depending on the gear modules and the number of loading cycles, taking into the account the fraction of crushed abrasive particles per cycle of loading the gear. This technique can be used to determine the duration of the test of the gear wheel material on samples at a constant total concentration of abrasive particles in the oil change for the units of machines with gear drives operating in the presence of abrasive particles in the working environment. The case under consideration corresponds to the operating conditions of the gear transmission in the unit, which allows calculating the oil change period in the units of machines operating in an abrasive environment.
Simulating cable tension in robotic systems for various conditions of upper and lower extremity rehabilitation
Authors: Perevuznik V S , Cherednikov I I , Malyshev D I 
Published: June 2022

Abstract
The paper discusses an optimized model of rehabilitation systems based on a cable-actuated robot designed for rehabilitation of patients with impaired motor function of upper and lower limbs. Tensile strength and cable lengths depending on joint angles are calculated to determine optimal positions of coils, with due account of the effects elasticity and gravity forces produce during rehabilitation. Based on the calculations, the positions of cable-driven actuators are determined such that the cables do not touch the patient’s body and the optimal forces of the actuators are ensured.
Technological methods to improve wear resistance of porous, sintered materials based on iron powder for antifriction purposes
Authors: Yunuskhodjaev S T 
Published: June 2022

Abstract
Technological methods of increasing wear resistance of porous, sintered materials based on iron powder for friction pairs of sliding of various agricultural machines are offered. The results of the research carried out with the aim of developing iron-based material compositions for sintered products of mass parts of sliding bearings, shaft supports of drawing devices, gears and others are given.
Reliability assessment of main gas pipelines
Authors: Abduev M Kh , Malozyomov B V , Vlasov O A 
Published: June 2022

Abstract
The article is devoted to assessing and predicting the reliability of gas compressor stations and pipelines. The issues of equipment safety are discussed, which is also reflected in the linear control of main gas pipelines, which involves ensuring comprehensive and constant monitoring of the operating parameters of the system. It is shown that technically similar tasks are implemented with the help of automatic equipment, which is equipped with control rooms and compressor stations.
Towards applicability of wavelet-based cross-correlation in locating leaks in steel water supply pipes
Authors: Faerman V , Sharkova S , Avramchuk V , Shkunenko V 
Published: June 2022

Abstract
The paper discussed the application of wavelet-based cross-correlation analysis to the processing of the leak noise signals acquired in the field. Nine recordings produced with the commercial leak noise correlator are considered in this study. All the cases are considered as classified as challenging for signal interpretation. For most of the cases, the basic correlation technique proved to be insufficient to measure the time lag with the required confidence. We implemented a wavelet cross-correlation algorithm for time lag estimation. At least in five cases out of nine, it managed to estimate time lag accurately. In three of the remaining cases, it failed. Unfortunately, due to a lack of information on field studies when records were produced, we are not able to investigate the reason of failures. We concluded that the proposed solution is practical and can be implemented in the software of leak noise correlators.
On ensuring dynamic voltage stability of critical loads in the electric power systems of industrial facilities
Authors: Suslov K V , Ilyushin P V , Kulikov A L 
Published: June 2022

Abstract
Voltage sags and interruptions in the electric power systems (internal grids) of industrial facilities are caused by various short circuits, including those that occur in external grids. If the depth and duration of such sags and interruptions exceed the rated limits for critical loads, they cause continuous processes to shut down, which produces defective products and entails substantial losses. Russian standards and regulations do not set forth requirements with respect to voltage sags and interruptions, which means that industrial companies cannot sue grid operators for damages. This is why dynamic voltage stability of critical loads involved in continuous processes has to be addressed within the internal grid. They analyze the effectiveness of solutions designed for dynamic voltage stability of critical loads; these can be shared, used on a single site or designed to power secondary circuits. It shows that use of dynamic voltage restorers (DVR) and dynamic voltage sag correctors (DVSC) can be a cost- effective solution if the topology and specifications are configured appropriately. The paper presents general technical requirements for sag and interruption compensators, which are adjusted for cost-effectiveness. Case-specific feasibility testing should be based on daily readings of electrical parameters and electric power quality readings, calculated electromechanical transients, and a feasibility study. Use of DVRs at an industrial facility helped stabilize the voltage curve and reduce the span of irregular voltage fluctuations by a factor of 3, reduce the average voltage at the 6 kV busbars without compromising equipment performance, and improve the starting conditions for AM clusters and self-starting conditions for large AMs. Thus, lowering the elevated voltage at the 6 kV busbars helped cut electricity purchase costs. In most cases where accidents cause disturbances in the external 110 kV grid, DVRs coupled with the automatic voltage controls of power transformers were able to prevent process shutdowns, which constituted the key cost effect.
Overview of existing methods of asynchronous motor diagnostics
Authors: Konstantinova M V , Malozyomov B V , Alikhadzhiyev S KH 
Published: June 2022

Abstract
The paper provides a review, analysis and research of existing diagnostic methods such as a vibroacoustic method based on the analysis of damped oscillations arising from dynamic loads of the system in friction nodes, the thermal method based on the analysis of thermal fields created by the object under study and the acoustic emission method, which includes an assessment of acoustic emission occurring in metals and welded joints. The advantages and disadvantages are identified and the conditions and areas of use of these methods are described. The applicability of these methods to such an electromechanical system as an asynchronous motor is also described. Vibroacoustic diagnostics can be used to assess shaft fatigue and wear of rolling bearings; thermal diagnostics can be used to diagnose the operation of the cooling system and assess the degree of aging of the insulation of the windings; the acoustic emission method is applicable in cases where it is necessary to assess the progressive wear of the shaft and bearing assemblies, as well as fatigue of gear elements in the gearbox.