bluuebunny/crossref_metadata_2025_split huggingface dataset:
Geometric modeling of drilling bit rolling cutters by generalized Hermitian splines
Authors: Sharipov Kakhramon , Akhmedov Yunus , Toshev Ilyos 
Published: December 2022

Abstract
The effective algorithms for calculating the theoretical profiles of the gauge surfaces of various bits have been developed, which reproduce such profiles using spline functions with precision up to the resolution of graphic devices on modern computers. Execution of the profile of gauge surface close to the theoretical one (especially for large-diameter bits with displaced axes of rolling cutters) can increase tool life by reducing the loss of diameter during bit processing. The proposed algorithm allows, based on well-known and rather routine method of calculating the elements of the gear armament, to develop automatic algorithm for calculating the cutting structure of crown, requiring the designer only to fill in a particle of initial data and then visually evaluate the displayed results.
Research of the oscillation process of raw cotton during transportation
Authors: Rakhmanov Khayridin , Fayziev Sirojiddin , Mirzayeva Sayyora , Toyirova Gulnoza 
Published: December 2022

Abstract
Theoretical research of the transportation process of the raw cotton with a tractor-trailer is given in this article. In order to ensure the safe transportation of raw cotton, the law of oscillation of the movement of the trolley on a rough road with a constant speed is determined. A theoretical analysis of the change in the amplitude of body oscillations is given and it is established that a practically constant and significant change in its values occurs only near the resonant frequency. The oscillation frequency in the low frequency zone is determined. In order to remove body oscillations from resonance, a speed limit that satisfies the conditions v < 8.1l/2π or v > 8.1l / 2π is set. Moreover, the research results of the impact of viscous properties of the transported raw cotton on the amplitudes of oscillations of both the upper and lower boundaries of the body, as well as on the moduli of oscillations and elastic force at various values mod F = C
0|y
0 − y
1| of viscous friction are given.
Deformations of elastic aftereffect: the effect of long – term strength loadings and concrete work diagram
Authors: Sodikov K Sh 
Published: December 2022

Abstract
The article presents data on the deformation of the elastic aftereffect of concretes of various compositions, at different stress levels of prolonged loading, the effect of prolonged loading on the strength and the diagram of concrete work. Development of relative creep deformations and elastic aftereffect of steamed concrete. The development of relative creep deformations and elastic aftereffects of natural hardening concrete of the B series under stress. Data on the effect of prolonged loading on the strength of the studied concretes. Development of relative creep deformations e_p(t) including deformations of elastic aftereffect after unloading of samples. Data on the effect of prolonged loading on the strength of the studied concretes.
Experimental investigation of the relationship between raw shaft density and saw cylinder electric motor load current
Authors: Sharibaev Erkin , Abrorov Akbar , Otaboev Bobir , Sharibaev Nosir , Daliev Abdunabi 
Published: December 2022

Abstract
In this research, the work was carried out to create and analyze mathematical models of steady technological processes in cotton cleaning, to obtain analytical expressions for the time of cotton and fiber processing and the time of turning raw materials into finished products. In addition, mathematical models for unstable technological processes in cotton cleaning were created and analyzed. Detailed information is provided on the technology of performing these works, the devices used, their operation, their efficiency, and ways to increase their efficiency.
NalTA energy in molecular sieve guest-guest interactions energetics of host-guest interactions in NalTA molecular electrics
Authors: Rakhmatkarieva F , Ergashev O , Davlatova O , Kokhkharov M , Khudoyberganov M , Abdurakhmonov E , Abdulkhaev T 
Published: December 2022

Abstract
The paper analyzes the isotherm and differential heats of adsorption of carbon dioxide in NaLTA and establishes the molecular host-guest mechanism of interactions in the molecular sieve matrix.
Justification of the design parameters of the compaction roller for creating longitudinal boards in the rows of cotton
Authors: Abdualiev N Kh 
Published: December 2022

Abstract
The article describes the formation of longitudinal and transverse slopes in Bukhara, Navoi, Khorezm, Kashkadarya regions and the Republic of Karakalpakstan. To date, sufficient research has not been conducted to create a new design, expand the capabilities and substantiate the parameters of the working bodies, although longitudinal thresholds are formed with the help of the developed devices, but in ensuring the quality and durability of the formed longitudinal thresholds. In this article, a theoretical study was carried out based on the parameters of the working body of the capacitor of longitudinal overlaps between rows of porous ones. As a result of theoretical studies, it was determined that the angle of inclination of the conical part of the capacitor cathode of the device should be 38 °, the total width of the cathode is 40 cm, the width of the conical part is 15 cm, the diameter of the cathode is at least 20.05 cm, the large diameter of the conical part 43.48 cm. As a result of the use of a device for the formation of a longitudinal bollard in the aisles of cotton, equipped with a sealing working body, a 46.2% reduction in manual labor was achieved, labor productivity increased 1.5 times.
Determination of heat efficiency in drying cotton raw materials in cotton grinding factories
Authors: Shodiev Ziyodullo , Sobirov Komil , Urinova Aziza , Shodiev Azimbek 
Published: December 2022

Abstract
One of the most important requirements to be studied in the transportation of raw cotton is to maintain its natural quality. Therefore, most researchers focus on the study of seed injury, as it affects the quality of the finished product, the negative effects on the characteristics and quality of technological spinning have been studied. To study the changes in fiber quality, effective methods and tools are used to process the results obtained as a result of the application of modern methods depending on the drying intensity in the drum dryer. As a result of technological processes (drying, cleaning, ginning) on all quality indicators were carried out in the laboratory of the Capital Cotton Ginning Plant and laboratory tests of the Association “Quality”. The composition of the mass fraction of the cover and the weed layer of the fiber were analyzed manually by the standard method. The method of mathematical planning of the experiment was used to perform and process the results of the experiment. For our study, a complete factorial experiment method of type PFE-23 was selected. Empirical data processing showed that the most important factors that significantly affect the quality and performance of drying are: - water temperature, heat carrier flow rate, raw cotton dryer performance, cotton initial humidity and drum shell heating temperature. In this regard, the following factors were selected for further experimental studies: initial humidity and drum mantle heating temperature when performing seed cotton dryers on wet cotton. In the process rules depending on the initial moisture content of the raw sawdust, the heat transfer rate ranges from 18 to 22 thousand m3 / s. On this basis, in experimental studies, we select an average value of heat transfer flow rate of 20 thousand m3 / h. The temperature of the dryer is selected from 1300 to 1900 according to the amount of initial moisture in the cotton.
Ways to intensify the heat exchange process during heating of liquid carbohydrates
Authors: Abdurakhmonov Olim , Islomov Alisher 
Published: December 2022

Abstract
The article presents the results of the study of the heat exchange process during non-heating of hydrocarbons. Heat transfer between heat carriers occurs mainly through thermal conductivity, convection. The intensity of heat transfer decreases when gases are formed in the composition of the heated liquid hydrocarbon. As the temperature of the heated hydrocarbon mixture increases, the gas formation in the apparatus, their partial increases, respectively. The value of the heat transfer coefficient characterizes the intensity of heat exchange between the wall and its surrounding working environment – by steam or liquid. The results of determining the main physicochemical and thermo-physical parameters of hydrocarbon heat carriers in liquid and vapor states are presented.
Research of impact of discharge parameters of electric impulse on the damage of tissue cells of the fig and the drying process and determination of its parameters
Authors: Akabirov Lazizjon , Narziyev Mirzo , Khujakulova Nilufar 
Published: December 2022

Abstract
The results of experimental research of improving the process of drying the locally grown figs by their initial treatment in an electric pulse field are given in this article. The results of the experiment were processed by mathematical statistics methods. The degree of tissue damage of the fig fruit is related to electric impulse discharge voltage. The results of the experimental research were conducted in order to determine the degree of tissue damage of fig fruit related to electric impulse discharge voltage. Processing of the results of all the experiments presented in the article with statistical methods was carried out based on the above methodology. The rest of the experimental results and statistical processing results are given in the form of tables and conclusions.
Triangularity effects on global flux-driven gyrokinetic simulations
Authors: Giannatale Giovanni Di , Donnel Peter , Villard Laurent , Bottino Alberto , Brunner Stephan , Lanti Emmanuel , McMillan Ben F. , Mishchenko Alexey , Murugappan Moahan , Hayward-Schneider Thomas 
Published: December 2022

Abstract
On the road to fusion energy production, many alternative scenarios have been investigated in order to address certain well-known problems of tokamak devices; among which, anomalous transport, ELMs and disruptions. The studies on plasma shaping fall into this effort.
In particular, it has been experimentally observed that when operating in L mode, negative triangularity (NT) features better confinement properties than positive triangularity (PT). However, even though the trend is quite clear, a complete and satisfying theoretical explanation for this experimental findings is still lacking.
With the aim of understanding and describing these improvements starting from first principles, we present the first comparison between PT and NT with global flux-driven gyrokinetic simulations performed with the ORB5 code.
The numerical setup includes: electrostatic turbulence, kinetic trapped electrons, non-linear collisional operator, ECRH source, limiter and wall as boundary conditions. The simulations have been performed on ideal MHD equilibria and kinetic profiles inspired by TCV experiments, in a mixed ITG-TEM regime.
First analysis reveal a strong reduction of transport in NT; while at the edge PT shows superdiffusivity, NT does not. The limiter plays an important role that has to be further clarified.
Gyrokinetic modelling of the Alfvén mode and EGAM activity in ASDEX Upgrade
Authors: Vannini F. , Biancalani A. , Bottino A. , Hayward-Schneider T. , Lauber P. , Mishchenko A. , Poli E. , Rettino B. , Vlad G. , Wang X. 
Published: December 2022

Abstract
Energetic particles present in tokamak machines can drive through resonant wave-particle interaction different plasma instabilities, e.g Alfvén modes and energetic particle-driven geodesic acoustic modes (EGAMs). While the former are potentially detrimental as they can enhance the energetic particle transport and damage the machine wall, the latter are axisymmetric, possibly benign modes that can act to regulate turbulence. A unique scenario, the so-called NLED-AUG case, has been developed in ASDEX Upgrade by tuning the plasma parameters so that the energetic particle kinetic energy is 100 times higher than that of the background plasma, like in ITER. An intense energetic particle-driven activity is observed, most prominently various Alfvén mode bursts triggering chirping EGAMs. The present work reports studies on the Alfvén mode and EGAM dynamics showing, for the first time, many toroidal mode gyrokinetic simulations with ORB5 where the NLED-AUG case scenario is considered. We study the mode dynamics modelling the energetic particles with different equilibrium distribution functions, such as: isotropic slowing-down, double-bump-on-tail and equivalent Maxwellian. We retain, at the beginning, the nonlinearities only in the energetic particle dynamics. Later, also the background plasma species nonlinearities are taken into account.
On cubic non-linearities in fluid and kinetic models
Authors: Villa D , Garbet X , Dubuit N , Agullo O 
Published: December 2022

Abstract
The kinetic origin of the cubic terms found in electromagnetic reduced fluid models of magnetized plasmas is identified and analyzed. The transition from cartesian to guiding center variables in kinetic systems is responsible for the introduction of such cubic terms, and the derivation of a set of such terms is explicitly shown. The role of these terms in fluid simulations, and their importance for energy conservation of cubic terms in both frameworks is discussed
Investigation of the effectiveness of ‘multi-harmonic’ electron cyclotron current drive in the non inductive EXL-50 ST
Authors: Banerjee Debabrata , Song Shaodong , Xie Huasheng , Liu Bing , Wang Mingyuan , Liu Wenjun , Chen Bin , Han Lei , Luo Di , Song Yunyang , Song Xianming , Liu Minsheng , Shi Yuejiang , Martin Peng Y. K. , Petrov Yu. V. , Harvey R. W. 
Published: December 2022

Abstract
The fully non-inductive spherical tokamak EXL-50, built and operated by the ENN private limited company, has routinely achieved high current drive efficiency of ∼ 1 A/W in only ECRH powered experiments. We have numerically investigated the effectiveness of multiple electron cyclotron resonance (ECR) harmonics in generating such a high efficiency of electron cyclotron current drive (ECCD) in non-inductive plasma start-up. The Fokker-Planck equation is numerically solved to obtain the electron distribution function, under the steady state of relativistic nonlinear Coulomb collision and quasi-linear diffusion operators, for calculating plasma current driven by the injected EC waves. Multi-pass absorption simulations, done with the CQL3D code for extra-ordinary EC waves, demonstrate over 1 A/W efficiency in current for a relatively low density (∼ 2 × 1018
m
−3), and low temperature (∼ 100 eV) plasma, consistent with the experimental results observed on EXL-50. Systematic scanning of different ECR harmonics in simulation has revealed that the multi-harmonic resonance interaction in EXL-50 plays a pivotal role in generating the energetic electron tail responsible for the current.
Long-wavelength closures for collisional and neutral interaction terms in gyro-fluid models
Authors: Wiesenberger M. , Held M. 
Published: December 2022

Abstract
A collisional gyro-fluid model is presented. The goal of the model is edge and scrape-off layer turbulence. The emphasize in the model derivation heavily lies on ”implementability” with today’s numerical methods. This translates to an avoidance of infinite sums, strongly coupled equations in time and intricate elliptic operator functions. The resulting model contains the four moments density, parallel momentum, perpendicular pressure and parallel energy and is closed by a polarisation equation and parallel Ampere law. The central ingredient is a collisional long-wavelength closure that relies on a drift-fluid gyro-fluid correspondence principle. In this way the extensive literature on fluid collisions can be incorporated into the model including sources, plasma-neutral interactions and scattering collisions. Even though this disregards the characteristic finite Larmor radius terms in the collisional terms the resulting model is at least as accurate as the corresponding drift-fluid model in these terms. Furthermore, the model does enjoy the benefits of an underlying variational principle in an energy-momentum theorem and an inherent symmetry in moment equations with regards to multiple ion species. Consistent particle drifts as well as finite Larmor radius corrections and high amplitude effects in the advection and polarization terms are further characteristics of the model. Extensions and improvements like short-wavelength expressions, a trans-collisional closure scheme for the low-collisionality regime or zeroth order potential must be added at a later stage.
Axisymmetric modes, fast ions and X-point effects in tokamak plasmas
Authors: Barberis T. , Porcelli F. , Fitzpatrick R. , Yolbarsop A. 
Published: December 2022

Abstract
Recent progress on the understanding of axisymmetric pertubations in tokamak plasmas is presented, with particular attention on Vertical Displacement Oscillatory Modes (VDOM) that can be driven unstable by their resonance with fast ion orbits, and on the impact of divertor X-points on the stability of vertical displacements.
Sinergy of extra-terrestrial particle accelerators and accelerators operated in the terrestrial atmosphere
Authors: Chilingarian A , Hovsepyan G , Zazyan M 
Published: December 2022

Abstract
We performed simulations of the EAS particle transport initiated by ultra-high-energy gamma rays entering the terrestrial atmosphere. During thunderstorms, the electric fields above the LHAASO array efficiently modulate EAS particles. Because of this modulation, the possible bias on the energy estimation for primary energies up to 100 TeV can be up to ten-fold. Moreover, for the higher primary energies (≈1 PeV), the electric field modulation enlarges “genuine” primary gamma ray energy 2.5-3 times. This result is very important because observation of PEVatrons by LHAASO is based on rather small statistics, and the highest energy events can occasionally coincide with thunderstorms. We also demonstrate the existence of a threshold effect on the intracloud E-field strength needed to trigger the startup of a runaway process that exponentially multiplies the free electrons entering a strong atmospheric electric field.
Atmospheric Electrical Activity in central Argentina and its relationship with phenomena observed at the Auger Observatory
Authors: Nicora M G , Baissac D M , Villagran C I , Velazquez Y , Solari F I , Barle M F , Pini L , Bertone F 
Published: December 2022

AbstractThunderstorms in Argentina have great spatial variability explained by various mechanisms on different spatio-temporal scales, associated with the meridional extension and orography of the region. The Pierre Auger Observatory is located in Mendoza Province in central-western Argentina where the unique meteorological and geographical conditions result in a high spacial density of convective storms.Atmospheric electrical activity (AEA)produces Transient Luminous Events (TLEs) of which ELVES are the most prominent members of the extraordinary family that includes halos, jetstorms, and sprites. Northern Argentina and Southern Brazil are prolific producers of TLEs, which can be observed at the Pierre Auger Observatory by the Fluorescence Detector (FD) 24 UV telescope. In this work, we present the characterization of the AEA in the study region and the most important meteorological characteristics to aid in understanding which of the dynamical or microphysical processes could act in the formation of TLEs.
Atmospheric Gamma-ray Observations at the Telescope Array Detector
Authors: Abbasi R. 
Published: December 2022

AbstractPreviously in AtmoHead-2018, we reported joint observations by Telescope Array Surface Detector (TASD), Lightning Mapping Array (LMA), sferic sensor and broadband interferometer of particle showers coincident with lightning. These consisted of energetic showers of approximately less than 10 microsecond duration with footprints on the ground of 3-6 kilometers in diameter, originating in the first one to two milliseconds of downward lightning leaders and coincident with high-current processes within the leaders. Scintillator waveform and simulation studies confirmed that these showers must consist primarily of gamma radiation.On September 11, 2021, atmospheric discharges emitting gamma rays were, for the first time, recorded by a high-speed camera and by lightning detectors on the ground simultaneously. The events were detected by the Telescope Array located in the Utah desert and were filmed by the Phantom v2012 camera, set at an acquisition rate of 40,000 frames per second (fps) in conjunction with the Lightning Mapping Array (LMA), an interferometer, a fast antenna, and the National Lightning Detection Network (NLDN). Results from this study reported the new observation of several events of significantly longer duration and higher uence, bridging the gap between the TASD and satellite-based detections. These events further demonstrate the similarity between the upward and downward TGF varieties and the likelihood of a common origin for their production.
Aerosol measurements at sub-percent precision using wide-field stellar photometry
Authors: Ebr Jan , Karpov Sergey , Eliášek Jiří , Blažek Jiří , Cunniffe Ronan , Ebrová Ivana , Janeček Petr , Jelínek Martin , Juryšek Jakub , Mandát Dušan , Mašek Martin , Pech Miroslav , Prouza Michael , Trávníček Petr 
Published: December 2022

AbstractWide-field stellar photometry – the process of simultaneous comparison of apparent and catalog brightness of a large number of stars – has long been a promising method of atmospheric monitoring, as it can provide atmospheric transparency measurements with high temporal and spatial resolution without any artificial illumination of the sky which would disturb nearby optical experiments. However, only recently have we developed methods of data analysis that allow an overall uncertainty in the Vertical Aerosol Optical Depth (VAOD) better than 0.01 optical depths. Such a feat requires precise laboratory measurements of spectral and signal responses of the instruments as well as careful analysis of all systematic effects that can appear during the extraction of stellar signals from the images. We will present a summary of the method with emphasis on the reliability of the estimates of uncertainties. Furthermore, we will discuss various possible applications of the method in different modes of operation, a comparison with other methods of aerosol measurement, and a selection of open questions and areas for further improvement.
The influence of reduced atmospheric transmission on the CTA-North performance
Authors: Pecimotika Mario , Prester Dijana Dominis , Hrupec Dario , Mićanović Saša , Pavletić Lovro , Sitarek Julian 
Published: December 2022

Abstract
Cherenkov Telescope Array (CTA) is the next generation ground-based observatory for gamma-ray astronomy at very-high energies which will consist of the northern (CTA-N, La Palma, Spain) and southern (CTA-S, Paranal, Chile) arrays. The atmosphere, as an integral part of the Cherenkov telescope detector, has a great impact on the observed data, especially in means of reduced sensitivity. One of the main contributions to the systematic uncertainties arises from the presence of clouds. To minimize these systematic uncertainties a calibration of the detector response is of great importance. Here, the influence of cloud altitude and transmission on the CTA-N performance degradation using detailed Monte Carlo simulations has been investigated for the case that no measures are taken to characterize clouds and correct their effects. The degradation effect of the presence of clouds is primarily observed at low and middle energies but spans across the entire energy range.