bluuebunny/crossref_metadata_2025_split huggingface dataset:
Evaluation of load-independent microhardness values in Plateau regions of Vanadium substituted Bi-2212 ceramics
Authors: Ulgen Asaf Tolga , Okur Semih , Erdem Umit , Pakdil Murat , Turgay Tahsin , Yildirim Gurcan 
Published: July 2022

Abstract
This study reveals extensively effect of homovalent V/Bi partial replacement in Bi2.0−xVxSr2.0Ca1.1Cu2.0Oy ceramic matrix (0.00 ≤ x ≤ 0.30) on the key mechanical design performance parameters and load-independent Vickers microhardness parameters in plateau limit region by means of experimental microhardness tests and semi-empiric approaching models. It is found that the vanadium substitution level of x = 0.01 is observed to be optimum amount in the Bi-2212 crystal lattice for refinement of fundamental mechanical properties due to the enhancement in stabilization of durable tetragonal phase, surface residual compressive stress and elastic recovery mechanism. Conversely, from the replacement level of x = 0.01 onwards, the lattice strain field and stress concentration sites enhance significantly depending on the increase of microscopic structural problems, interaction problems between adjacent layers and crack-initiating flaws in Bi-2212 ceramic system. Correspondingly, stress-induced phase transformation begins to play predominant role, and excess vanadium substituted ceramic materials are easily broken at relatively smaller test load. Moreover, the models indicate that every ceramic compound shows standard indentation size effect (ISE) feature due to predominant behavior of elastic recovery in crystal structure. Hence, presence of optimum vanadium ions strengthens typical ISE characteristic behavior. Furthermore, among semi-empirical models the indentation-induced cracking (IIC) model exhibits the highest performance to inspect real microhardness values of Bi2.0−xVxSr2.0Ca1.1Cu2.0Oy ceramic compounds in the plateau limit region.
A cosmological underdensity does not solve the Hubble tension
Authors: Castello Sveva , Högås Marcus , Mörtsell Edvard 
Published: July 2022

Abstract
A potential solution to the Hubble tension is the hypothesis
that the Milky Way is located near the center of a matter
underdensity. We model this scenario through the
Lemaître-Tolman-Bondi formalism with the inclusion of a
cosmological constant (ΛLTB) and consider a generalized
Gaussian parametrization for the matter density profile. We
constrain the underdensity and the background cosmology with a
combination of data sets: the Pantheon Sample of type Ia supernovae
(both the full catalogue and a redshift-binned version of it), a
collection of baryon acoustic oscillations data points and the
distance priors extracted from the latest Planck data
release. The analysis with the binned supernovae suggests a
preference for a -13 % density drop with a size of approximately
300 Mpc, interestingly matching the prediction for the so-called KBC
void already identified on the basis of independent analyses using
galaxy distributions. The constraints obtained with the full
Pantheon Sample are instead compatible with a homogeneous cosmology
and we interpret this radically different result as a cautionary
tale about the potential bias introduced by employing a binned
supernova data set. We quantify the level of improvement on the
Hubble tension by analyzing the constraints on the B-band absolute
magnitude of the supernovae, which provides the calibration for the
local measurements of H
0. Since no significant difference is
observed with respect to an analogous fit performed with a standard
ΛCDM cosmology, we conclude that the potential presence of a
local underdensity does not resolve the tension and does not
significantly degrade current supernova constraints on H
0.
Explaining the UHECR spectrum, composition and large-scale anisotropies with radio galaxies
Authors: Eichmann B. , Kachelrieß M. , Oikonomou F. 
Published: July 2022

Abstract
Radio galaxies are promising candidates as the sources of ultrahigh energy
cosmic rays (UHECRs). In this work, we examine if the stringent constraints
imposed by the dipole and quadropole anisotropies as well as the UHECR
spectrum and composition allow that radio galaxies are the dominant
extragalactic cosmic ray sources. In order to calculate the UHECR flux
emitted by individual
radio galaxies, we constrain their properties using information from the
radio-CR correlation and a dynamical evolution model. In
addition to the UHECR flux from individual, local sources, we
include the diffuse flux emitted by the bulk of non-local radio galaxies based
on their radio luminosity distribution. Analyzing the source parameters within
a range around their expected properties, we finally determine the
configurations of local sources describing well the UHECR spectrum, composition
and large-scale anisotropies. We obtain a good description of all data
even in the case that we include only a small number of local sources. In
particular, we find that scenarios where few sources like Fornax A and Virgo A
dominate the flux above the ankle, while low-luminosity radio galaxies
contribute an isotropic background dominating below the ankle,
provide a good fit to the data.
A Region Selection Method for Real-time Local Correlation Tracking of Solar Full-disk Magnetographs
Authors: Bai Yang , Lin Jia-Ben , Bai Xian-Yong , Yang Xiao , Wang Dong-Guang , Deng Yuan-Yong , Zhu Xiao-Ming , Hu Xing , Huang Wei , Tong Li-Yue 
Published: July 2022

Abstract
Hundreds of images with the same polarization state are first registered to compensate for the jitters during an observation and then integrated to realize the needed spatial resolution and sensitivity for solar magnetic field measurement. Due to the feature dependent properties of the correlation tracker technique, an effective method to select the feature region is critical for low-resolution full-disk solar filtergrams, especially those with less significant features when the Sun is quiet. In this paper, we propose a region extraction method based on a Hessian matrix and information entropy constraints for local correlation tracking (CT) to get linear displacement between different images. The method is composed of three steps: (1) extract feature points with the Hessian matrix, (2) select good feature points with scale spaces and thresholds, and (3) locate the feature region with the two-dimensional information entropy constraints. Both the simulated and observational experiments demonstrated that our region selection method can efficiently detect the linear displacement and improve the quality of a ground-based full-disk solar magnetogram. The local CT with the selected regions can obtain displacement detection results as good as the global CT and at the same time significantly reduce the average calculation time.
Effect of magnetic geometry on the energy partition between ions and electrons in the scrape-off layer of magnetic fusion devices
Authors: Li Y. , Xu G. , Dudson B. , Liu X. , Huang Z. , Killer C. , Feng Y. , Liu S. , Yan N. , Morales J. , Tsitrone E. , Brezinsek S. , Liang Y. , Eldon D. , Xiao C. , Geiger J. , Grulke O. , Otte M. , the WEST Team  , the W7-X Team  
Published: July 2022

Abstract
A universal energy partition mechanism between ions and electrons has been confirmed to exist in the scrape-off layer of both the WEST tokamak and the W7-X stellarator. A peaked plasma density structure induced by an infinite magnetic connection length structure is observed to destroy this dependence and enhance the local ion and electron temperature ratio in the stellarator. A theoretical analysis reveals that the ratio of ion and electron parallel heat conduction is predominant in determining this universality, while electrons would further be cooled in the density-peaked region.
Characterization of Faults in Power Transformers Based on Oil Chromatographic Analysis in the Coastal Zone
Authors: Collazos Camilo , Arroyo Victor , Chauca Mario , Ramos Javier , Morales Jose , Cuba Roberto 
Published: July 2022

Abstract
The purpose of this research work is to predict failures in power transformers based on oil chromatographic analysis and thus improve their reliability and avoid further deterioration of equipment and untimely service outages. The research is basic, descriptive, correlational level, and an experimental design. The sample consisted of 3 transformers corresponding to a company in charge of the distribution of electrical energy in the coastal area of Peru, different techniques were used such as the characteristic gas methods, from Dornemburg, from the Rogers relationships, from the total gases fuels. From the analysis of these samples, the gas content presented by the transformers was related to the faults presented by the equipment. The values found were compared with the maximum levels allowed using the key gas method. In this way, they were related to the conditions and the possible causes of breakdowns that could occur. We conclude that gas chromatography analyzes the oil that is composed of elements that make up the insulation of a transformer of many hydrocarbon bases comprised of between 16 and 22 carbon atoms, in addition to cellulose, which is a polymeric hydrocarbon that decomposes and releases gases when a thermal or electrical fault occurs.
Designing MPC Controller for a Heat Exchanger Equipped with Thermoelectric Generators
Authors: Kemjariya Sucha , Daosud Wachira , Weerachaipichasgul Weerawun , Kittisupakorn Paisan 
Published: July 2022

Abstract
A thermoelectric generator (TEG) is a solid-state semiconductor device that can convert temperature differences and heat flow into electrical energy. Nowadays, industries with high-temperature production processes tend to experience unavoidable heat loss. Heat exchangers are therefore the most widely used equipment to recover these waste heat. The researcher therefore saw the benefits of bringing TEG devices to be installed in heat exchangers. It is thought that in addition to the heat exchanger being a device that helps the heat transfer of one fluid to another fluid. Can also generate electricity back to use as well. This will be of great benefit in increasing the efficiency of waste heat recovery and reducing production costs. In this research, 36 plates of Bismuth Telluride (Bi2Te3) TEG devices were installed in plate and fin heat exchangers and studied the effect of changes in the inlet flow rate of cold water at 20 °C on the effect of heat exchange and the electrical power produced by TEG. The hot water inlet flow rate was constant at 1 l/min and the temperature was constant at 85 °C. Then mathematical model was created to predict the results of the outlet hot water temperature, outlet cold water temperature, current and voltage produced. The model can predict accurately the least squares value (R2) with values of 0.949, 0.859, 0.707 and 0.749, respectively. In addition, a multiple input, multiple output (MIMO) using model predictive controller (MPC) was designed to control the output current, and temperature can control into the setpoint effectively.
A Study of Large Sheave Counter-Roller Spinning Force
Authors: Zhu Chengcheng , Li Fan , Meng Dean , Dong Yuanzhe 
Published: July 2022

Abstract
In this paper, a counter-roller spinning method is presented, which is designed to produce relatively thin-walled large sheaves. The large sheave counter-roller spinning force is poorly studied. And the forming forces have a significant influence on industrial applications. Herein, theoretical analysis and numerical simulation methods were utilized to explore the large sheave counter-roller spinning process and spinning force. Anisotropy of the material was considered by the Hill-48 anisotropic yield criterion. Numerical simulation has been demonstrated to correspond to experimental values. The spinning forces in the simulation and experiment matched well and steadily increased throughout the process. The roller and mandrel have similar spinning forces, and the radial spinning force is much larger than other forces. Finally, a theoretical model to compute the spinning force was constructed.
Design and Application of Automobile Intelligent Instrument Panel Interface
Authors: Zhang Caizhong 
Published: July 2022

Abstract
This article first investigates the functions and styles of automotive dashboards on the market, and summarizes some of the existing problems and user pain points. Combining emerging technologies and user needs, analyze the functions and technologies that are helpful to the driver, thereby improving the safety of the driver’s operation. This research uses the user-centered design concept and explores the intelligent and humanized dashboard design to replace the display of the car’s central control screen. The dashboard adopts an innovative form that combines a steering wheel and a game handle, which gives it a sense of technology and speed, and improves the safety and cognition of users.
The BIM Lifecycle Management of Manufacturing Cultural Heritage Projects
Authors: Lin Kaixin , Long Yongzhuo , Chen Boke , Chen Simin , Luo Zhihua 
Published: July 2022

Abstract
As a popular cultural heritage in China, the Lingnan architecture is increasingly adopting prefabricated construction to meet the growing need in building projects exhibiting the unique culture of the region, which can be enhanced by BIM technology. As most BIM related research focuses on particular phases of a project, there lacks of a study on the BIM lifecycle management, particularly on manufacturing cultural heritage projects. Hence, this research analogizes the BIM lifecycle management to the evolution of biological agents, and constructs the self-organizing relationship complex of BIM application key items and BIM application technology prototype, taking this as the cornerstone to develop a lifecycle BIM management framework and form an operation theory for manufactured heritage buildings, which are verified through a case study.
Some Generalizations of Random Broken and Pick-up Stick Problems
Authors: Liu Yucheng , Wang Zhichao 
Published: July 2022

Abstract
We consider sticks with random lengths, which are further randomly broken into several pieces. The probability that these sticks can form a polygon is computed in this article. This Broken Pick-up Stick Problem was first asked in [1] and we give a general formula to solve this problem. Besides, we study the probability that any three sticks with independent and uniformly distributed lengths can form a triangle. Our results generalize the famous Spaghetti Problem and the Pick-up Stick Problem in probability. We present a way to transfer these continuous probability problems into discrete problems and apply combinatorial methods to address the discrete version of the problems.
Application of the Chimera Method to Poisson’s Equation with the Homogeneous Dirichlet Boundary Condition
Authors: Chien Henry , Fan Yupeng , Zeng Ziyun 
Published: July 2022

Abstract
Establishing variational formulation is an effective way to study the existence and uniqueness of the solution of certain elliptic partial differential equation with boundary condition. For the solution of certain elliptic partial differential equation with boundary condition, we know that the numerical solution obtained by the finite element method approximates the solution of this equation. Moreover, to avoid gridding overly complex domains, we can use the Chimera method to decompose the domain into several overlapping sub-domains. In this paper, we study Poisson’s equation with the homogeneous Dirichlet boundary condition. By analyzing the existence and uniqueness of the solution of the corresponding variational formulation, we know the existence and uniqueness of the solution of Poisson’s equation with the homogeneous Dirichlet boundary condition. We use the Chimera method and the finite element method to deal with Poisson’s equation with the homogeneous Dirichlet boundary condition by constructing two iterative sequences and analyzing their properties.
Application of WKB Method in Approximating Wave Functions in Square Potential Wells
Authors: Guo Haohui 
Published: July 2022

Abstract
This paper introduces a widely used approximation method, the Wentzel-Kramers-Brillouin (WKB) method, for solving the Schrodinger equation, sets up a theoretical framework to derive the general solutions of the method, and carries out the application of the approximation method in specific cases to verify the validity and practicality of the method. Throughout the study, numerical methods, such as the Simpsons method, and programming tools, such as Python, are used to process sophisticated calculations. The final approximated solutions for the Schrodinger equation are able to demonstrate the state of a particle in an isolated quantum system. All the presented studies are based upon the knowledge and skillsets of a high school student.
Drug Level Modelling with Difference and Differential Equations
Authors: D’Cunha Shilpa , Lakshmi Gorty V R 
Published: July 2022

AbstractIn the current study, drug level in the human body is studied using mathematical modelling, where the difference equations have been used as a means of analyzing the dosage over a prescribed time, reduction in dose half-life, and the total amount of residual drug in the blood-stream for a given time-period. Further, the differential equations approach is investigated for data fitting using Mathematica to extend the application adhering to the continuous nature of the inherent function. The perspective helps to preserve critical resources and render comparative results. In this approach, zero-order, first-order, and fractional order kinetics are explored and compared.
Numerical Simulation Study and Analysis of Water Inrush from Floor Concealed Subsidence Column during Mining
Authors: Wei Fu 
Published: July 2022

Abstract
In order to clarify the role of mining on the surrounding rock failure and water inrush of the karst collapse column in the working face floor, the concealed karst collapse column in the floor of Geting Coal Mine is taken as the research object, and the FLAC3D numerical simulation software is used to analyze the mining process. The stress field in the vertical direction, the plastic failure zone and the displacement change in the vertical direction are analyzed and studied, and the water inrush process of the hidden floor karst collapse column under different advancing distances is analyzed. The research results show that with the continuous increase of the advancing distance, the plastic failure range of the karst collapse column continues to increase, and the vertical displacement of the floor continues to increase. When the plastic failure zone of the coal floor and the plastic failure zone of the karst collapse column are connected, Water inrush accidents from the karst collapse column of the floor are prone to occur.
Simulation of Meshing of Herringbone Double Circular-Arc Helical Gears using Multibody Dynamic Analysis Software
Authors: Lee C K , Hsieh C L , Ruan J C , Wang C Y 
Published: July 2022

Abstract
This paper aims to complete the simulation of meshing of a pair of herringbone double circular-arc helical gears by using the multibody dynamic analysis software, SolidWorks motion. Three types of edge modifications, including no edge modification, chamfered edge modification, and rounded edge modification, are applied respectively to the pair of gears. The output angular velocities and contact regions corresponding with the three types of edge modifications are analyzed. Moreover, whether the center distance assembly error affects the output angular velocity and contact regions are analyzed. The results obtained by the simulation of meshing show that rounded edge modification is better than chamfered edge modification, and chamfered edge modification is better than no edge modification. The center distance assembly error has no effect on the output angular velocity and has little effect on the contact regions. Therefore, double circular-arc helical gears are not sensitive to center distance assembly errors.
A Hybridizable Discontinuous Galerkin and Boundary Element coupling method for electromagnetic simulations
Authors: Kong Yan , Yan Mei 
Published: July 2022

Abstract
In this paper, the hybridizable discontinuous Galerkin (HDG) method is combined with the electric field integral equation (EFIE) for the numerical simulation of time-harmonic Maxwell’s equation. The key feature of HDG-EFIE is that the HDG method and the boundary element method (BEM) can be coupled naturally through the extra hybrid variable on the faces of elements, the combined method produces a linear system in term of the degrees of freedom of the extra hybrid variable only. A numerical solution was compared to the analytical solution and found to be in excellent agreement.
A Short Review of Deep Tissue Imaging Techniques and Applications
Authors: Song J , Dean Z 
Published: July 2022

Abstract
Deep tissue imaging is a fundamental research method in the field of biological imaging. With an intent on obtaining more clear and detailed images deep within tissue, researchers have put much focus on developing deep tissue imaging techniques. In the past few decades, deep tissue imaging techniques have been improved in many aspects. In contrast to increasingly refined techniques, the application of these techniques seems to have not received equally attention. In this review, we will focus on the advanced applications of deep issue imaging that have emerged in recent years.
Reconstruction, Analysis of the Process ggH Decay to llνν Monte Carlo with MH=125 GeV and Introduction of the Physical Background
Authors: Zeng Fanli , Liu Yiwei , Ouyang Ze , Wu Bolin , Zhang Jingyuan 
Published: July 2022

Abstract
This paper outlines analysis the process gg → H → WW → llνν Monte Carlo, collision events with MH=125GeV. The discovery of the Higgs boson perfected the standard model and proposed more processes of the production, decay of the Higgs and the Higgs Mechanism. In this analysis, ggH process is reconstructed. Analyzed and calculated the probability of decay WW pairs as productions of decay process. Simulated Monte Carlo signal samples and background are compared to data from Atlas.
Research on Physical Laws Behind Irreversible Cartesian Diver
Authors: Zhang Wantong , Wu Zhe 
Published: July 2022

Abstract
The float-sink is an instrument used to demonstrate the pressure transmission of liquids, and it is a vivid proof of Archimedes's principle and Pascal's principle. When pressure is applied to the container in which the sinker is located, the sinker sinks; when the pressure is released, the sinker floats up. This phenomenon qualitatively proves Archimedes's law. But when the sinker sinks to a certain critical depth, even if the pressure is released, the sinker will no longer float up. This phenomenon is the so-called "irreversible sinker". This article mainly analyzes the irreversible principle and influencing factors when the float-sink reaches the critical depth and explores the influence of different influencing factors on the critical depth through mathematical analysis and experimental methods. Finally, it is concluded that the critical depth when the float is irreversible is related to factors such as the mass of the float, the volume of gas in the float and the height of the water in the container, and the critical depth has a linear relationship with the mass of the float.
Observing the Development of Two Solar Flares by Monitoring AR 12882 which Produces a Kp6 Geomagnetic Storm in October 2021
Authors: Rossdee Anis , Shariff N N M 
Published: July 2022

Abstract
In this paper, we study active region 12882 in conjunction with the level of geomagnetic storm based on space weather data. Several flares occurred in this region in October 2021, including M1.6 and C2.1. Data were also collected from the online solar monitor and space weather live database provided by NOAA and SDO/AIA. The study of the solar flare events was done by monitoring the sunspot region for the past four days to observed changes in the earth’s atmosphere. The M-class flare event made by AR 12882 produced a CME with a speed exceeding 500 km/sec which directed towards Earth and produced an intense geomagnetic storm with kp6 index.