bluuebunny/crossref_metadata_2025_split huggingface dataset:
Performance of FAST with an Ultra-Wide Bandwidth Receiver at 500–3300 MHz
Authors: Zhang Chuan-Peng , Jiang Peng , Zhu Ming , Pan Jun , Cheng Cheng , Liu Hong-Fei , Zhu Yan , Sun Chun , Collaboration FAST 
Published: May 2023

Abstract
The Five-hundred-meter Aperture Spherical radio Telescope (FAST) has been running for several years. A new ultra-wide bandwidth (UWB) receiver, simultaneously covering 500–3300 MHz, has been mounted in the FAST feed cabin and has passed a series of observational tests. The whole UWB band is separated into four independent bands. Each band has 1,048,576 channels in total, resulting in a spectral resolution of 1 kHz. At 500–3300 MHz, the antenna gain is around 14.3–7.7 K Jy−1, the aperture efficiency is around 0.56–0.30, the system temperature is around 88–130 K, and the half-power beamwidth is around 7.6′–1.6′. The measured standard deviation of pointing accuracy is better than ∼7.9″ when zenith angle is within 26.4°. The sensitivity and stability of the UWB receiver are confirmed to satisfy expectations through spectral observations, e.g., H i and OH. The FAST UWB receiver has already demonstrated good performance in capturing sensitive observations for various scientific goals.
Global Energetics of Solar Powerful Events on 2017 September 6
Authors: Li Dong , Warmuth Alexander , Wang Jincheng , Zhao Haisheng , Lu Lei , Zhang Qingmin , Dresing Nina , Vainio Rami , Palmroos Christian , Paassilta Miikka , Fedeli Annamaria , Dominique Marie 
Published: May 2023

Abstract
Solar flares and coronal mass ejections (CMEs) are thought to be the most powerful events on the Sun. They can release energy as high as ∼1032 erg in tens of minutes, and also can release solar energetic particles (SEPs) into interplanetary space. We explore global energy budgets of solar major eruptions that occurred on 2017 September 6, including the energy partition of a powerful solar flare, and the energy budget of the accompanying CME and SEPs. In the wavelength range shortward of ∼222 nm, a major contribution of the flare radiated energy is in the soft X-ray (SXR) 0.1–7 nm domain. The flare energy radiated at wavelengths of Lyα and mid-ultraviolet is larger than that radiated in the extreme ultraviolet wavelengths, but it is much less than that radiated in the SXR waveband. The total flare radiated energy could be comparable to the thermal and nonthermal energies. The energies carried by the major flare and its accompanying CME are roughly equal, and they are both powered by the magnetic free energy in the NOAA AR 12673. Moreover, the CME is efficient in accelerating SEPs, and the prompt component (whether it comes from the solar flare or the CME) contributes only a negligible fraction.
Decametric Solar Radio Spectrometer Based on 4-element Beamforming Array and Initial Observational Results
Authors: Guo Shao-Jie , Gao Guan-Nan , Shen Fa-Xin , Yang Feng-Hui , Dong Liang , Wang Min 
Published: May 2023

Abstract
The dynamic spectral observation at decametric wavelength is important to study solar radio physics and space weather. However, the observing system is difficult to observe with high sensitivity at this band due to the fact that the system temperature is dominated by the sky background noise and the antenna is difficult to design with high gain. An effective solution to improve the sensitivity is constructing an antenna array based on the beamforming method. Accordingly, we develop a decametric solar radio spectrometer system based on a 4-element beamforming array. The system consists of four antennas, an 8-channel analog receiver and a digital receiver. We use the true time delay to implement the beamformer and the classical FFT method to perform spectrum analysis in the digital receiver. Operating at a frequency range of 25–65 MHz with dual-circular polarizations, the system provides high resolution dynamic spectrum with spectral resolution of ∼12 kHz and temporal resolution of ∼5.3 ms (typical). Tens of solar radio bursts have been observed successfully during the period of the trial observation, demonstrating the system’s ability to detect fine structures with high spectral and temporal resolution. In this article, we present the design, implementation, and initial observational results of the decametric solar radio spectrometer system in detail.
Attention-Based Deep Learning Model for Image Desaturation of SDO/AIA
Authors: Zhang Xinze , Xu Long , Ren Zhixiang , Yu Xuexin , Li Jia 
Published: May 2023

Abstract
The Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO) captures full-disk solar images in seven extreme ultraviolet wave bands. As a violent solar flare occurs, incoming photoflux may exceed the threshold of an optical imaging system, resulting in regional saturation/overexposure of images. Fortunately, the lost signal can be partially retrieved from non-local unsaturated regions of an image according to scattering and diffraction principle, which is well consistent with the attention mechanism in deep learning. Thus, an attention augmented convolutional neural network (AANet) is proposed to perform image desaturation of SDO/AIA in this paper. It is built on a U-Net backbone network with partial convolution and adversarial learning. In addition, a lightweight attention model, namely criss-cross attention, is embedded between each two convolution layers to enhance the backbone network. Experimental results validate the superiority of the proposed AANet beyond state-of-the-arts from both quantitative and qualitative comparisons.
A New Emission Mode of PSR B1859+07
Authors: Wang Tao , Wang P. F. , Han J. L. , Yan Yi , Yu Ye-Zhao , Kou Feifei 
Published: May 2023

Abstract
Previous studies have identified two emission modes in PSR B1859+07: a normal mode that has three prominent components in the average profile, with the trailing one being the brightest, and an anomalous mode (i.e., the A mode) where emissions seem to be shifted to an earlier phase. Within the normal mode, further analysis has revealed the presence of two submodes, i.e., the cW mode and cB mode, where the central component can appear either weak or bright. As for the anomalous mode, a new bright component emerges in the advanced phase while the bright trailing component in the normal mode disappears. New observations of PSR B1859+07 using the Five-hundred-meter Aperture Spherical Radio Telescope (FAST) have revealed the existence of a previously unknown emission mode, dubbed the Af mode. In this mode, all emission components seen in the normal and anomalous modes are detected. Notably, the mean polarization profiles of both the A and Af modes exhibit a jump in the orthogonal polarization angle modes in the bright leading component. The polarization angles for the central component in the original normal mode follow two distinct orthogonal polarization modes in the A and Af modes respectively. The polarization angles for the trailing component show almost the same but a small systematic shift in the A and Af modes, roughly following the values for the cW and cB modes. Those polarization features of this newly detected emission mode imply that the anomalous mode A of PSR B1859+07 is not a result of “phase shift” or “swooshes” of normal components, but simply a result of the varying intensities of different profile components. Additionally, subpulse drifting has been detected in the leading component of the Af mode.
Comparison of current-voltage characteristics of molybdenum ditelluride and black phosphorene channel material based field effect transistor to optimize conductance
Authors: Shaik Z , Deepak A 
Published: May 2023

Abstract
The work aims to improve the current and conductance characteristics of Molybdenum ditelluride and Black phosphorene in a novel 2D Field Effect transistor for different thickness level of oxide from 1 nm to 10 nm. Materials and Methods: Molybdenum ditelluride and Black phosphorene channel-based Field Effect transistor was chosen as two groups having 16 samples each. The current characteristics were simulated by varying the oxide thickness. Reducing the oxide thickness of MOTE2 will lead to increased current and conductance characteristics. The novel 2D FET is simulated to obtain better current characteristics based on nanotechnology and reducing the oxide thickness of BP will lead to increased current and conductance characteristics in novel 2D FET. Results: MOTE2 based Novel 2D FET has higher conductance than BP based 2D FET. Gate oxide thickness was at 1 nm during maximum conductivity for MOTE2 based 2D FET and 10 nm for BP based Novel 2D FET in NanoHub simulation tool. The results were obtained with a level of significance value is 0.001 for current and 0.0001 for conductance, and pretest power value of 80% using SPSS tools. Conclusion: Within the limit of study, MOTE2 based Novel 2D Field-effect transistor has better current (2876.39) and conductance (9.587e-03) mho characteristics than BP based 2D FET current (1250.58) and conductance (4.168e-03) mho.
Optimizing the input parameters setting for least hole defects while drilling CFRP laminates by multi-objective optimization on the basis of ratio analysis (MOORA) method
Authors: Barik T , Parida S , Pal K 
Published: May 2023

Abstract
Carbon fiber reinforced plastic laminates have been kept under the category of hard-to-machine materials despite having some unmatchable properties like high strength, stiffness, corrosion resistance, etc. The heterogeneous nature of the material makes the essential secondary machining process a challenging task to perform. Drilling is always considered the effective way to drill holes necessary for the assembling purpose in structure building. Though, drilling the CFRP laminates critically affected by the abrasiveness of the reinforcing fibers eventually produces various defects. In this particular experimental analysis, a decision-making model associated with the Multi-objective optimization of ratio analysis (MOORA) method has been used in selecting the best possible parameter setting for minimizing defects. The results suggested that this method is found to be effective in solving the real-world problem of selecting the optimized parameter setting in drilling CFRPs. The best possible combination of low point angle, high speed, and low feed rate produces the least drilled hole defects.
Analysis of mechanical properties of 3D printed metallic specimens of aluminum (CL31) bronze (CL80) material manufactured at varying laser scanning speed
Authors: Vashist V , Oldal I , Szakal Z 
Published: May 2023

Abstract
In our research work, we analyzed the mechanical properties of 3D-printed metallic specimens of aluminium bronze material. In our evaluation, we had five groups of specimens, manufactured at different laser scanning speeds. In total, we had 25 specimens for which we examined various parameters like ultimate tensile strength, engineering yield point, relative strain, and hardness. Results showed that specimens prepared with a lower laser scanning speed of 300mm/s showed the lowest tensile strength. The tensile strength increased with increasing laser scan speed and the highest tensile strength was attained by specimens of the fourth group that were produced at a laser scanning speed of 500mm/s. The relative strain of specimens also increased with the increasing scan speed of the laser. The Brinell hardness test also showed an elevation in hardness values with increasing laser scan speeds.
X-Ray absorption fine structure study of schiff base cobalt (II) complexes of 5,5-dimethyl-2-(4-arylhydrazono) cyclohexane-1,3-dione
Authors: Agrawal Pankaj , Sharma Pradeep , Mishra Ashutosh 
Published: May 2023

Abstract
Hereby, we emphasize on X-Ray absorption fine structure of Schiff Base cobalt (II) complexes. The aryl groups studied were 4-bromophenyl and 4-nitrophenyl complexes. Different functional groups of complexes are confirmed by FTIR, and XRD demonstrates the crystalline structure of the compound. The chemical shift, the shift of K-edge and primary absorption maximum shift along with edge width have all been determined via XANES data analysis. In addition to this, we were calculated the ENC and percentage covalency. EXAFS data were used to calculate the first shell bond length using several graphical techniques. To get deep insight of bond length, we exploited the normalised Fourier transform spectra to derive information. Athena software was used to analyse the data. Origin software was employed to represent the data graphically.
Optimization of process parameters on wire cut electrical discharge machining and surface integrity studies of AA6070/MgO composites
Authors: Vinoth S , Rajasekar C , Sathish P , Sureshkumar V , Yasminebegum A , Hasane Ahammad Sk , Girimurugan R 
Published: May 2023

Abstract
There are a variety of uses for metal matrix composites (MMC), including the aerospace and automotive industries. Because of their benefits including light weight and inexpensive cost, they are popular. Wire cut electric discharge machining (WEDM) stands out as a great option for creating complex or complicated shapes out of composite materials, especially when compared to other common non-traditional machining processes. An AA6070 metal matrix composite containing 5% and 10% MgO weight fraction (wt) was made using the stir casting method in this work. Various process factors, such as wire tension (WT), dielectric pressure (Pd), gap voltage (Vg) and peak current (IP) are taken into account when the AMMC specimen is machined utilising WEDM. Slot machining rate (MR) and surface roughness (Ra) can be measured and assessed using L18 mixed Orthogonal Array (OA) investigations. Experiments are examined using TOPSIS and ANOVA methodologies for order preference based on similarity to the ideal results (ANOVA). Analysis has shown that the best mixture of processing factors for improved MR and Ra: wt = 5%, vg = 50 V, WT = 13 g, Ip = 9 A, and Pd = 15 bar. Machining Rate and Ra have ideal process parameters of 1.5 mm/min and 3.648 m. ANOVA shows that MR and Ra are significantly influenced by peak current.
Analysis of undulator and gyro-synchrotron radiation for application at tera-hertz
Authors: Mishra G. , Gehlot Mona , Gupta Vikesh 
Published: May 2023

Abstract
We analyze the undulator and gyro-synchrotron radiation of the devices by equating the number of periods of the helical trajectory of the gyrating motion to the number of undulator periods. The gyro radiation is characterized by cyclotron resonance maser interaction exhibits superior line width quality but higher sensitive to beam energy spread when operated at tera-hertz due to finite larmor radius effects.
Structural and optical properties of Magnesium borate phosphors for dosimetric purpose
Authors: Sharma R , Mehta M 
Published: May 2023

Abstract
The recent study presented the structural and optical features of Sm-doped magnesium borate. The X-ray diffraction pattern displays the crystal structure of the prepared sample which matches with the JCPDS card. The morphological studies, elemental analysis, and vibrational properties were examined by SEM, EDX, and FTIR measurements. The TL emission spectra of pure magnesium borate phosphors show only one peak at 209°c, and doped phosphors show an intense peak at 212°c. The PL excitation (PLE) spectrum of the MgB4O7: Sm samples was observed at a wavelength range of 330 – 475 nm. The maximum sharp line is detected nearly at 407 nm that corresponds to ions Sm3+ transition of 6H5/2 → 4K11/2 and the PL emission of the intense line was measured at a wavelength of 612 nm due to the significant excitation of Sm3+ ions from 4G5/2 to 6H7/2. In addition, the bonding behavior of synthesized phosphors was determined by Raman spectroscopy.
Reinforcement of micro and nano material with aluminum alloy (Al7075) metal matrix composite: a review
Authors: Koria Chandra Shekhar , Kumar Rajan , Chauhan Premanand S 
Published: May 2023

Abstract
The characteristics and structural performance of a composite material’s properties are better than those of its component parts because It comprised of a pair or more insoluble, chemically separate stages. functioning alone. ‘Metal-Matrix’ composites materials that have been produced from metals and ceramics had fibers or particles incorporated into them to enhance their physical characteristics. The fabrication of several parts and components in the aircraft and aerospace industry regularly uses aluminium 7075 alloy, a significant technical material. Its high strength to density ratio makes metal matrix composites very desirable. We provide an overview of Al 7075 Metal Matrix Composites in this study.
Performance analysis and mechanical behavior of aluminum metal matrix composite
Authors: Jerome Nithin Gladson G , Deepak Raj K , Devesh R , Jeeva Prakash R , Pandurangan S 
Published: May 2023

Abstract
The increased traits and qualities that composite materials provide in comparison to those of single materials have led to their widespread use across a variety of modern sectors (metals). In recent years, there has been a rise in the demand for high-performance aluminum metal matrix composites. This is mostly due to the improved mechanical characteristics of these composites, which are necessary for fulfilling the needs of sophisticated engineering applications. The mix of different types of reinforcing materials has a significant impact on the performance of these composites. With a tensile strength that is equivalent to that of certain steels, aluminum 7068 is one of the strongest aluminum alloys that are now available for purchase on the market. Heat treatment may be performed on this material, which is an aerospace alloy by another name. This project’s primary objective is to improve the mechanical properties of aluminum 7068 by incorporating three distinct compositions—silicon carbide (SiC), boron carbide (B4C), and titanium dioxide (TiO2)—into the metal matrix of aluminum 7068 using a process known as stir casting, and then determining the mechanical properties of each individual composition by putting them through a series of mechanical tests. Compositions are compared with one another and with those of unreinforced Al7068 based on the results of the tests, and an effective composition is determined for the purpose of further research.
Flow visualisation of water channel setup for supersonic flow analogy
Authors: Surya Kkumar R , Manigandan R , Gokul DJ 
Published: May 2023

Abstract
In the present study, flow over aerodynamics models is analysed in water channel flow to understand flow physics at affordable cost. The water channel flow visualization setup is constructed to analyse the analogy between Froude number and Mach number and flow visualization over various models is observed. In order to conduct the study, the shallow water speed is varied from 0.4 m/s to 0.6 m/s in the test section of water channel which will corresponds to the Froude number, Fr= 2. The water channel results will be finally validated to wind tunnel at Mach number, M=2. The velocity of water channel can be found by tracing the motion of suspended particles over shallow water at defined length and also by the volumetric flow rate. Several tests were conducted over a spike model to understand the flow visualization and videos were captured. The hydraulic jump and divergent angle in the water surface will be observed and validated with the corresponding shock angle in air medium. Failure analysis throughout the constructs are discussed to understand and resolve different problems faced with the specimen, test section along with camera setup. The present setup can be used multiple times for long duration to observe the flow visualization for undergraduate students.
A numerical and experimental investigation of mitigation of the vibration in a structure using single pendulum type mass damper
Authors: Natesan S , Ramasamy S 
Published: May 2023

Abstract
The main objective of the present work is that to construct a combined Pendulum Type Mass Damper (PTMD) in a structure to demonstrate the effect of damping of vibrations. In order to achieve this, a simple prototype has been developed. An inductive proximity sensor has been used to measure the vibrations of prototype with the PTMD system in terms of the induced voltage signal. The induced voltage signals have been acquired by using an Arduino UNO controller board. The experiments have been carried out to measure the amplitude of displacement of the vibrations in the structure in terms of voltage signals for two cases: (i) Without adding the damper or tuned mass and (ii) With adding the damper or tuned mass of 100 g, 150 g, 200 g, 250 g and 300 g respectively. However, this work reports the experimental results only for 250 g. The theoretical analysis of PTMD has been studied and presented in this paper. A numerical model for the combined pendulum type mass damper with the structure has been developed by using MATLAB SIMULINK. A series of simulations have been carried out for the various values the mass ratio, μ = 0, 0.25, 0.5, 0.75 and 1 to show the effect damper or tuned mass on the vibrations of the structure. The simulation results of amplitude of displacement of the structure have been analyzed and presented in both time domain and frequency domain. By keeping the same condition of experimental analysis of 250 g damper or tuned mass, the simulations have been carried out for two cases: (i) Without absorber mass (mass ratio, μ=0) and (ii) With a damper mass of 250 g (mass ratio, μ=0.33) in order to validate the experimental results.
Machining of aluminium 6063 alloy using high strength steel and titanium nitride novel coated drill tool using CNC and comparing the material removal rate
Authors: Jayaram Reddy P , Vinodh D 
Published: May 2023

Abstract
This study compares two tools, HSS M42 and TiN Coated twist drill bits, in order to determine which tool has the better material removal rate (MRR). Drill bits were of high speed steel (HSS M42) tool and use of Novel coating of Titanium Nitride on HSS tool in this study. The machining is done on a experimental specimen made of aluminium alloy AA6063. The material removal rate of both tools is measured in CNC drilling on two sets of 20 specimens each. Spindle speed, depth of cut, and feed were all controlled variables. G power 80% used for calculating sample size. SPSS software was used to record and analyse the results for both tools. The average MRR recorded for HSS M42 tool was 14.9803 mm3/s with a Standard deviation value 1.713221. This study has a significance value of 0.037 (p < 0.05) with a g power of 80%. The titanium nitride coated tool had an average MRR of 20.06995 mm3/s and 1.179870 standard deviation. The results were achieved at 0.037 significance, that is lower than 0.05. The titanium nitride coated drill bit has comparatively better MRR than the high speed steel drill bit in no-lubricant and no-coolant drilling circumstances, as per this study.
Comparing the performance of uncoated insert and TiC insert in CNC novel machining of LDX 2101 duplex stainless steel for minimizing surface roughness
Authors: Thiagarajan C , Yagnesh Mandu 
Published: May 2023

Abstract
By differentiating titanium carbide (TiC) tool and cemented carbide uncoated tool during the CNC machining of LDX 2101 steel, this experimental approach aims to diminish surface roughness (SR). The control group comprised uncoated inserts while the experimental group featured TiC inserts. These drilling parameters parameters were speed of cutting, rate of feed, and cut depth. The number of groups was 2, and there were 27 samples used for each group in the trials. The standard SR value for TiC inserts is 0.06778 µm, while that for uncoated inserts is 0.145880 µm. Between two inserts, there is an 0.01 significant difference (p<0.05). In agreement with the constraints of this work, LDX2101 duplex stainless steel has a higher SR when machined with a TiC insert and a lower SR when machined with an uncoated insert.