bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of number of well and core radius on the binding energy and optical properties of multishell spherical quantum dot with parabolic potential
Authors: Kirak M 
Published: May 2023

Abstract
In the current study, the probability densities and binding energy of the ground state and first excited sate in multishell quantum dot with parabolic confinement potential have been examined. Also, the effects of core radius, the number of well in structure and the presence of impurity on the total optical absorption coefficient have been investigated. The finite difference method has been used to obtain the energy levels and related wave functions of the system within framework effective mass approximation. The results obtained reveal that the number of well, especially the first five values, have a considerable impact on the critical core values of binding energy. It is found that the presence of impurity and the number of wells cause a blue shift in the peak positions of total absorption coefficients. Moreover, our results show that these factors have an important effect on the magnitude of optical properties.
Dynamic characteristics of rectangular single-layered black phosphorus-based mass sensor
Authors: Ling Xueqing , Zhang Yiqing , Xu Feng 
Published: May 2023

Abstract
Recently, anisotropic black phosphorus (BP) has been reported to have significant physical and mechanical properties, and BP-based mass sensors have the latent applications in detecting the mass of nanoparticles attached on BP. In this paper, an orthotropic plate model (OPM) attached concentrated mass and molecular dynamics (MD) simulations are adopted to investigate the dynamic characteristics of rectangular single-layered BP-based (RSLBP-based) mass sensors. The influences of mass, position of the attachment and RSLBP size on the fundamental frequency of RSLBP-based mass sensor are discussed. The results show that when attachment mass increases, or the position of attachment moves from the edge to the middle of RSLBP, the fundamental frequency of the RSLBP-based mass sensor decreases. The fundamental frequency of RSLBP-based mass sensors decreases more significantly with increasing the attachment mass when the size of RSLBP is very small. The results calculated by OPM attached concentrated mass are agreed well with the results calculated by MD simulations, which indicates that the OPM attached concentrated mass can forecast the dynamic characteristics of RSLBP-based mass sensors significantly.
Cavitation erosion-corrosion behaviour of Fe-19Cr-15Mn-0.66 N high nitrogen austenitic stainless steel in sodium chloride solution
Authors: Li Liang , Qiao Yanxin , Zhou Huiling , Li Xin , Huang Lei , Yang Lanlan , Wang Lei 
Published: May 2023

Abstract
In this work, the cavitation erosion (CE)-corrosion behaviors of high nitrogen austenitic stainless steel (HNSS) Fe-19Cr-15Mn-0.66 N were investigated under both static and CE conditions in 0.5 mol l−1 NaCl solution. For the sample after 8 h CE, the cumulative mass loss increased by 15% in 0.5 mol l−1 NaCl solution compared to distilled water, indicating that the corrosive media promoted mass loss. The corrosion behavior of the samples under static and CE conditions was evaluated using electrochemical techniques. The results showed that compared with the samples under static conditions, the samples under CE had a higher corrosion rate, and the corrosion resistance of the samples gradually decreased with the prolongation of C E time.The open circuit potential and potentiodynamic polarization tests showed a higher corrosion rate under CE conditions. The electrochemical impedance spectroscopy results revealed a decrease in corrosion resistance with increasing CE time. The XPS results showed that CE has a significant effect on the composition of the passive film, promoting a notable increase in Cr2O3 and Fe2O3.
Structural, magnetic and magnetocaloric effect of pyrochlore iridate Er2Ir2O7
Authors: Ezairi Sara , Elouafi Assaad , Lmai Fatima , Tizliouine Abdeslam 
Published: May 2023

Abstract
The structural, morphological, magnetic and magnetocaloric properties of Er2Ir2O7 are investigated. The x-ray diffraction analysis showed that Er2Ir2O7 has a cubic structure with the Fđ3m space group. Using Williamson-Hall (W-H) plot, the crystallite size was found to be smaller than that obtained from the SEM image. Magnetic measurements revealed a weak ferromagnetic transition at TC = 140 K, caused by the appearance of magnetic order of the Ir moments. ΔT (temperature at full width of half maxima) was estimated to be 27 K and 40 K for magnetic field changes of 40 kOe and 50 kOe, corresponding to the relative cooling power (RCP) values of 98 J kg−1 and 128 J kg−1, respectively. Temperature-averaged Entropy Change (TEC) was calculated for all applied magnetic fields, and found to be slightly lower than

−
Δ

S

M

max

values, indicating less hysteresis loss in the compound Er2Ir2O7 during the magnetic transition. This study provides a new pyrochlore material for MCE magnetocaloric applications.
Theoretical investigations of optoelectronic and transport properties of halide based K2YAuX6 (X = Cl, Br) double perovskites
Authors: Mustafa Ghulam M , Waqar Raja , Saba Sadaf , Noor N A , Farooq Zahid , Imran Muhammad , Behram R B , Alanazi Yousef Mohammed 
Published: May 2023

Abstract
Intriguing optoelectronic and transport properties with huge compositional range and structural stability make double perovskites interesting for energy harvesting technologies. Here we theoretically investigate the structural, optical, mechanical, and transport properties of K2YAuX6 (X = Cl, Br) double perovskites using the WIEN2K code. Based on the calculated values of the tolerance factor and enthalpy of production, the thermodynamic and structural stability is affirmed. The ductile nature of these compositions is revealed in the computation of Poisson’s ratio (>0.26) and Pugh’s (1.75) ratio. The involvement of s-states of K, p-states of Cl/Br, and d-states of Y and Au in the formation of valence and conduction band edges is exhibited from the density of state plots. Using the Tran-Blaha mBJ potential and spin-orbital coupling, the energy bandgap value for K2YAuCl6 and K2YAuBr6 is reported as 3.20, and 2.70 eV, respectively, which is suitable for the fabrication of light-emitting diodes. Optical behavior is further explored regarding complex dielectric constant, refractive index, optical conductivity, optical loss, and absorption factor. The small value of thermal conductivity with large value of electrical conductivity, Seebeck coefficient, power factor, and figure of merit revealed the potential of these materials for the fabrication of light-emitting diodes and thermoelectric generators.
Non-exotic static spherically symmetric thin-shell wormhole solution in f (Q, T ) gravity*
Authors: Tayde Moreshwar , Ghosh Sayantan , Sahoo P.K. 
Published: May 2023

Abstract
In this study, we conduct an analysis of traversable wormhole solutions within the framework of linear

gravity, ensuring that all energy conditions hold for the entire spacetime. The solutions presented in this paper are derived through a comprehensive analytical examination of the parameter space associated with the wormhole model. This involves considering the exponents governing the redshift and shape functions, as well as the radius of the wormhole throat (

), the redshift function value at the throat (

), and the model parameters (α and β). Moreover, we establish bounds on these free parameters, which guarantee the satisfaction of the energy conditions throughout spacetime and also provide two solutions. Furthermore, we use the Israel junction condition to observe the stability of a thin-shell around the wormhole. Finally, we calculate the null energy condition criteria as well as the potential for the thin-shell and how it varies with the chosen shape function.
A parametric study of ultra-short laser surface patterning of freeze foamed TCP-Zr: effects of laser parameters on surface morphology
Authors: Filipov E , Angelova L , Ahlhelm M , Avdeev G , Buchvarov I , Daskalova A 
Published: May 2023

Abstract
The application of ultra-short lasers pulses in surface modification has gained a significant interest as they allow precise patterning of materials without inducing any collateral thermal damages. Tricalcium phosphate (TCP) is a widely exploited material for scaffolds in bone tissue engineering; however, such composites could lack the appropriate porosity that is crucial for the tissue regeneration process. This article presents a combination of fabricating porous ceramic scaffolds and their processing by a femtosecond (fs) laser for enhancement of the surface properties. The morphological observation revealed evident differences on the exterior of the treated zones, as the dense structure was preserved but the porosity of the surface appeared improved. An X-ray diffraction analysis showed that the laser treatment increased the crystallinity of ZrO2 and TCP, thus stabilizing the material. The laser-induced surface microporosity substantially changed the wetting state of the scaffolds’ surfaces making them hydrophilic. Based on these findings, we could state that the femtosecond laser processing of TCP-ZrO2 composites could have the potential to improve their applications in fields such as bone tissue engineering.
Lidar monitoring of the aerosol content in the near-ground atmospheric layers over Sofia
Authors: Grigorov I , Schumanov K 
Published: May 2023

Abstract
Lidar measurements provide possibility to determine and localize the sources of aerosol emissions in the air, to determine the presence of airborne transport of dust in the atmosphere, to track in real-time aerosol movement above vast territories [1-4]. Presently, along with building networks of ground lidar stations, such as the European Aerosol Research Lidar Network (EARLINET), it becomes more and more important to develop and refine the lidar methods of processing the data from measurements to retrieve the necessary information [5]. The present study comments on results of aerosols monitoring in the lowest atmospheric layers above Sofia by using lidar remote sensing. More than 20 lidar measurements were carried out in the period January – June 2022. The lidar system emitted laser pulses nearly horizontally within the planetary boundary layer (PBL); the reflected pulses were collected to calculate the range-corrected signals and to produce color-coded time-distance diagrams. These diagrams, superimposed on a map of the city to illustrate the location of the aerosol layers were published on the website of the Laser Radar Laboratory of the Institute of Electronics (IE-BAS) at: http://www.ie-bas.org/Departments/LidarData_Horizont/Quicklooks-Horizont.htm.
Application of fluorescence spectroscopy for analysis of different onion varieties during storage in storehouse
Authors: Mihalev M S , Vladimirova – Mihaleva L S , Slavova V , Genova S 
Published: May 2023

Abstract
The present study aimed to establish the application of fluorescence spectroscopy for a comparison of three onion genotypes after harvest and at certain intervals of storage period. The genotypes were stored in a storehouse under ambient conditions. This will allow the method to be applied as non-invasive in quality control of onion production during storage. The experimental studies were performed with sixty-three accessions (21 after three months of storage, 21 after 6 months of storage and 21 after 9 months of storage). The equipment for emission fluorescence spectra generation is mobile and has applicability in local characteristics of the production. In its adjustment (optical tuning) a systematic engineering approach based on the classical principles of modern optoelectronics is applied. The results of the experiment will contribute to the optimization of the time for analysis of onion genotypes and will support the breeding process in its initial stages when it is necessary to qualify a large set of samples.
Linear polarimetry for analysis of skin degenerative alterations
Authors: Ilyov S , Genova Ts , Troyanova P , Gisbrecht A , Avramov L 
Published: May 2023

Abstract
Investigation and characterization of the basic polarimetric characteristics on different cutaneous degenerative conditions (Syndrome of Raynaud, lupus, and psoriasis) histological samples was carried out to evaluate the potential for analysis of skin degenerative alterations. Stained and unstained histological samples from the different groups of degenerative conditions of the skin were histologically addressed and were used for polarimetric measurements. Diode laser linearly polarized beam at 635 nm was used for irradiation of the samples and polarimeter, working in the visible spectral range 400-700 nm was applied for polarimetric measurements. We will present the results of histology tissue slides evaluation through Stokes polarimetry in transmission geometry. These studies allow analysis of skin degenerative alterations in collagen anisotropic structuration in extracellular matrix and could be used as indicators of the tissue condition. Therefore, the present work would make possible the establishment of database with polarimetric features of degenerative skin conditions.
New vector type optical vortex structures in isotropic media
Authors: Slavchev V , Dakova A , Dakova D , Bozhikoliev I , Kovachev L , Biswas A 
Published: May 2023

Abstract
In the present work, the formation of vector-type vortex structures in isotropic media is studied. These vortices exist in the electric field components and generate a depolarization in the vector field of the laser spot. Their behavior is governed by a system of amplitude equations. Additionally, new solutions have been found that describe similar types of vortex structures in an optical fiber. The optical vortices admit only amplitude-type singularities. The vortex structures observed within the vector amplitude function have ring-like patterns. The variation of the intensities of the x and y components of the amplitude function along the axis of the fiber is investigated.
Scaling the mid-IR radiation at 7 μm - two-stage double-pass 195 MHz narrow-bandwidth DFG laser system
Authors: Stoychev L I , Baruzzo M , Suárez-Vargas J J , Cabrera H , Nikolov I P , Demidovich A A , Danailov M B , Vacchi A 
Published: May 2023

Abstract
We present a laser system based on difference frequency generation (DFG) to produce tunable, narrow-linewidth (<30 pm), and high-energy mid-IR radiation in the 6785 nm region. The system exploits nonlinear crystals (such as LiInS2, LiInSe2 and BaGa4Se7) and nanosecond pulses generated by single-frequency Nd:YAG and Cr:forsterite lasers at 1064 and 1262 nm, respectively. Various experimental configurations are used: single-pass and double-pass through the nonlinear crystal. Additional increments of the output energy can be obtained by performing two stage double-pass geometry.
Additive manufacturing of hydroxyapatite: effect of some stereolithography parameters on the dimensional accuracy of green, debinded and sintered parts with different geometries
Authors: Schrijnemakers A , Vertruyen B , Coibion D , Closset R , Hastir R , Boschini F 
Published: May 2023

Abstract
We report on the stereolithography printing of a hydroxyapatite powder dispersed in an acrylate-based resin with a focus on the influence of the laser power, the scanning speed and the layer thickness on the dimensional accuracy of the green, debinded and sintered parts and on the microstructural and mechanical properties of the sintered parts.
Numerical Simulation of the Propagation of Premixed Gas in a Pipe Flame Arrestor
Authors: Liu Duo , Sun Shaochen , Wang Lin 
Published: May 2023

Abstract
In this paper, a numerical model of the propagation process of premixed gas in a pipeline flame arrestor is established and solved. The numerical simulation results show that the flame propagation velocity and pressure variation curves of the propane-air premixed gas are the same as those of the ethylene-air premixed gas. The flame front and pressure oscillate periodically throughout the process, and the flame speed oscillates down when the flame front reaches approximately the middle and rear of the pipe. In contrast, the flame velocity versus pressure curve for the explosion of hydrogen-air premixed gases is quite different, with the flame propagating at an almost constant velocity in the initial stages, accelerating suddenly when the flame front reaches near the middle of the pipe, reaching a peak, followed by an accelerated decrease in flame velocity; at the middle and rear of the pipe, the flame once again propagates at a nearly constant velocity, and as the flame is quenched, the flame propagation velocity once again accelerates and decreases. The explosion pressures of the propane-air and ethylene-air premixed gases at each measurement point in the pipeline increase linearly with the initial pressure, and the explosion pressure appreciation is very close. The explosion pressure of hydrogen-air premixes increases significantly with increasing initial pressure, but the increase decreases slightly. The increase in initial pressure increases the flame propagation rate of the premixed gas, and the acceleration effect is significant.
Research on Output Voltage Self-Balance Control Method of Bipolar DC Distribution Grid for Renewable Energy Consumption
Authors: Wen Chuanxin , Yun Yang , Han Zhongxiu , Wang Yu , Huang Jun 
Published: May 2023

Abstract
Changes in the positive and negative DC loads of bipolar DC distribution grid cause the voltages of DC buses to deviate from the rated value, resulting in additional losses due to unbalanced current and affecting the reliable operation of the distribution grid. This paper proposes an output voltage self-balance control method based on a neutral-point-calmed triple active bridge (NPC-TAB) converter in a bipolar DC distribution grid. First, the topology and operating principle of NPC-TAB are introduced. Then the power model of the topology is deduced based on the phasor method. Based on the above analysis, an output voltage self-balance control method is proposed with the minimization of reactive power to achieve the self-balance of output voltage while controlling the minimization of reactive power of the converter. Finally, the simulation model is established in MATLAB/Simulink to verify the effectiveness of the optimal control method.
Application Research of PVT in Solar House R-CELLS
Authors: Ai Dengxin , Xu Ke , Wang Kun , Zhang Li , Yin Baoquan , Zhang Yi 
Published: May 2023

Abstract
The application of PVT (Photovoltaic-thermal) technology is discussed based on R-CELLS, which is a zero-energy solar energy house at Solar Decathlon China 2021. Combined with the actual data, the simulation model of the PVT system, which supplies domestic hot water and heating bathroom, is established in TRNSYS, and the performance evaluation of the whole year and heating season and economic analysis of the whole life cycle is carried out at the same time. Comparing and analyzing the system with or without auxiliary heating in the water tank, the simulation results show that the annual average electrical efficiency of the system is 15.35% and 15.52%, the annual average thermal efficiency is 3.36% and 9.52%, and the payback period is 13.87 years and 12.12 years. By increasing the number of PVT panels, 4 PVT panels can achieve zero energy consumption of the system, and the payback period of the PVT system can be reduced to 6.5 years after continuing to increase. The small-scale PVT system is systematically analyzed based on a case, and the importance of water tank auxiliary heating design and supply-demand matching design in the PVT energy supply system is found through data comparison, which has reference significance for the promotion of PVT building energy supply system in the future.
Research on the Fusion of Power Big Data Technology and Power System Simulation Calculation
Authors: Li BangYuan , Chang Rong , Yang ChuanXu , Mao ZhengXiong , Bao Fu , Tian Yuan , Zhang Hang 
Published: May 2023

Abstract
Power big data is the practice of big data concepts, methods, and technologies in the power industry. It is composed of structured data and unstructured data. It mainly involves power generation, transmission, transformation, and distribution. Power big data can reflect the macro-economy in real time, promote economic and social development, and improve the internal management level and economic benefits of the power industry enterprises. The integration of power big data technology and power system simulation calculation can update system analysis in real-time and provide new perspectives and methods for system analysis.
Loss Analysis of High-Speed Permanent Magnet Motor for Cordless Vacuum Cleaner
Authors: Bi Qing , Shao Dingguo 
Published: May 2023

Abstract
Compared with traditional permanent magnet motors, high-speed permanent magnet motors (HSPMM) have the advantages of fast dynamic response, high efficiency, high reliability, small size, etc. Therefore, HSPMM has been widely used in household and industrial fields, and the research on high-speed permanent magnet motors has become a hot spot in the motor industry. In this paper, the high-speed permanent magnet motor is applied to the cordless vacuum cleaner, and the calculation and analysis of the iron loss and copper loss of the high-speed permanent magnet motor are emphatically studied for the HSPMM used in the cordless vacuum cleaner.
Research on the Design and Verification of the Civil Aircraft Battery Integrated Control System
Authors: Wu Shanyong 
Published: May 2023

Abstract
This paper aims to study the integrated control technology of the civil aircraft battery system. The battery system is the backup power supply of the important DC (Direct Current) power equipment on the aircraft. As the last line of defense of the civil aircraft electrical power system, it plays an irreplaceable role in the safety of the aircraft. So, the research on battery system control is particularly important. This paper adopts forward design methods, such as capturing design requirements, functional decomposition, and integrated design, and proposes a relatively advanced battery-integrated control technology. This technology is verified by laboratory tests, on-aircraft ground tests, and flight tests. The test results show that this technology meets the design requirements and better solves the control problem of the battery system. It also has good social benefits and important reference significance for developing subsequent new aircraft types. It is of great significance to promote the rapid commercialization of civil aircraft in our country.