bluuebunny/crossref_metadata_2025_split huggingface dataset:
Optimising inflationary features the Bayesian way
Authors: Hamann Jan , Wons Julius 
Published: March 2022

Abstract
Modern cosmological data demand modern data analysis techniques. We introduce BayOp, a new likelihood sampling and maximisation method which is based on the Bayesian Optimisation algorithm and learns a function instead of randomly sampling from it. We apply BayOp to analyse Planck data for traces of inflationary features models with global periodic modulations of the primordial power spectrum. While we do not find any new evidence for features, we demonstrate that BayOp provides an extremely efficient way of sampling likelihoods over low-to-moderate-dimensional parameter spaces, even for very complex likelihood landscapes.
Calculations of differential momentum transfer spectra for J/ψ photoproduction in heavy-ion collisions *
Authors: Wang Pengfei , Wu Xin , Zha Wangmei , Tang Zebo 
Published: March 2022

Abstract
Understanding the gluonic structure in nuclei is one of the most important goals in modern nuclear physics, for which J/ψ photoproduction is suggested as a powerful tool to probe the gluon density distribution. The experimental investigation of the photoproduction process is conventionally studied in ultra-peripheral heavy-ion collisions, and has recently been extended to hadronic collisions. However, theoretical efforts in hadronic heavy-ion collisions are still lacking in the literature. In this paper, we build up a phenomenological framework to calculate the differential momentum transfer spectra for J/ψ photoproduction in hadronic heavy-ion collisions based on a vector meson dominance model. For the first time, we include the effect of internal photon radiation in the calculations, and we find that the results with internal photon radiation could describe the experimental measurements from STAR very well.
Energy Momentum Squared Gravity in Doneva-Jazadjiev anisotropic pressure model of non-rotating neutron stars
Authors: Hanifa  , Danarianto M. D. , Sulaksono A. 
Published: March 2022

Abstract
We implement the Doneva-Yazadjiev (DY) anisotropic model of neutron stars into Energy Momentum Squared Gravity (EMSG) theory. We have shown that the Tolmann-Oppenheimer-Volkoff (TOV) equation within this model can be expressed in the terms of effective pressure and energy density. The structure of neutron stars (NS) is then calculated by using Basic Standard Parameter equation of state with hyperons in the center. We found that the combined model is able to adjust the mass-radius relation of the NS. We also found that this model could affect boundary limit of EMSG parameter, α, in the term of stability.
Kinematics analysis of the transient Milky Way warp using RGB stars from Gaia DR2
Authors: Nurhidayat R M , Arifyanto M I , Wulandari H R T 
Published: March 2022

Abstract
The perturbations to the Milky Way cause the disk to have bending or breathing wave, flare, and warp. Both spatial analyses from stellar and gas show the Milky Way warp can be approached with sinusoidal function to the Galactocentric longitude. In this research, we aim to find evidence of the transient Milky Way warp using kinematics data of the Red Giant Branch (RGB) stars from Gaia Data Release 2. We only use RGB stars with positive parallaxes and small parallax uncertainties where ϖ > 0 and ϖ/σϖ
> 5, respectively. Using the linear warp model, we find the Milky Way warp starts on Rw
= 10.72 kpc, with the amplitude (γw
) of 0.39 and the Line of Node lies on ϕw
= −5.26°. Assumed the warp is a static long-lived feature on kinematics distribution, where all of the warp parameters are constant by the time, the observed vertical velocity (Vz
) is less than the expected one. The maximum Vz
is not exceeded to 12.5 km/s rather 20 km/s derived from the proposed model. It infers that the warp drive on the Milky Way is a transient feature. One of the possible reasons is the recent interaction with satellite galaxies in perturbing the outer disk of the Milky Way.
Exploring the dynamical evolution of minimoon 2020 CD3 in a circular restricted three-body problem framework
Authors: Nor M F A , Dermawan Budi 
Published: March 2022

Abstract
Asteroid 2020 CD3 was one of the most recently captured natural objects that became Earth’s transient satellite or minimoon. The asteroid is very likely residing in an Earth-like orbit (ELO) with 1:1 mean-motion resonance and occasionally captured by the Earth. In this study, the dynamical evolution of this object is conducted in a framework of Circular Restricted Three-Body Problem (CR3BP). Five thousand test objects are generated by distributing the orbital space with a random uniform scheme around the object’s nominal values comprising ten sigma-uncertainties of the orbital parameters and four Metonic cycles of the epoch. This numerical task has run for 1000 years with the IAS15 integrator known for its adaptive integration and high accuracy for millions of years of simulation. We found that almost all of the test particles are lying in a boundary region, hence follow chaotic and quasi-periodic trajectories and have become minimoon with an average of 15-16 times. The duration of captures of more than a year is very rare. Interestingly, there seems a preferred recapture time at ∼ 30 years. Most of them still stay in the ELO region, although a few have either been hit the Earth or expelled into vast space.
Preliminary results on spectral line survey of Uranus at the millimeter/sub-millimeter wavelength using ALMA data
Authors: Mumtahana Farahhati , Hidayat Taufiq 
Published: March 2022

Abstract
Previous studies and spectroscopy observations concluded that Uranus has the fewest spectral line features among other giant planets. It is challenging yet very possible to conduct the line survey with the abundance of available Uranus observation data, particularly in millimeter/sub-millimeter. As a sensitive radio interferometer, Atacama Large Millimeter/submillimeter Array (ALMA) frequently observes Uranus from wide viewing windows and the narrow spectral resolution which is very suitable for spectral survey study. In this paper, we report the preliminary results of Uranus’ spectral line survey over various ranges of ALMA spectral windows at bands 3 to 9, taken from 2012 – 2018. With CASA data processing tools, the survey results from 451 spectral windows (spw), 216 line candidates from 98 spw were suspected as the first step to examine molecule’s existence in Uranus. Although most of them had SNR below 3, some prominent spectral line features were detected tentatively such as the line profiles at the frequency of carbon monoxide (CO) and methanol (CH3OH). The inconsistent results on CO confirmed the previous theory that this molecule might be originally from external. Although this CO detection is an important finding as it might be the first time to be discovered in Uranus from ALMA, to declare as a real detection, it is necessary to confirm with more observations and correction with some relevant factors.
Fluctuation of Satellite Charging in the Low Earth Orbit Regime due to Interaction with Ionospheric Plasma
Authors: Ahmad Nizam 
Published: March 2022

Abstract
Low Earth-orbiting satellites will always interact with the ionospheric plasma, leading to disruption of satellite operations, depending on the impact of the interaction. Under normal circumstances (without interference), the magnitude of the fluctuation in satellite charging is less than 5V (negative). Any disturbance from charged particles will cause the satellite to experience a more drastic voltage drop of the order of a few hundred volts (negative). The identification of fluctuations in satellite charging is carried out by reviewing the space conditions around the satellite, characterized by several parameters such as density, energy, and plasma temperature, as well as the saturation density of the satellite. To strengthen the analysis, this study deepens the flux changes with an energy of the order of MeV along the satellite orbit. The results of the study show that several low-earth orbit satellites experience a fairly high saturation density, which is correlated with fluctuations in electron flux in some regions traversed by the satellite, such as the polar and the SAA regions. The results confirm that the two regions could be a danger zone for both polar and equatorial satellites.
Development of 24 hours Dst index prediction from solar wind data and IMF Bz using NARX
Authors: Nuraeni F , Ruhimat M , Aris M A , Ratnasari E A , Purnomo C 
Published: March 2022

Abstract
Disturbance Storm Time (Dst) index is an index which measured the decrease in the horizontal component of the Earth’s magnetic field near the magnetic equator due to increases in the magnetospheric ring current. The index shows the strength and duration of a geomagnetic storm. The geomagnetic storms themselves could harm technological systems on earth. Dst index prediction is needed as an effort to mitigate the impact of geomagnetic storms. This paper described a 24 hours Dst index prediction using a nonlinear autoregressive exogenous (NARX) method. Solar wind parameters and interplanetary magnetic field (IMF) Bz has been used as exogenous input for the model. By using 39 geomagnetic storms data during 1997 to 2000 as training data and 7 geomagnetic storms data during 2000 to 2001 as testing data that have not been used in the training, the correlation between target and ouput was 0.97. The model than being used to predict Dst index for operational purposes and obtained the RMSE from 1 August to 31 October 2021 was ‘∼5 – 20 nT during quiet days and ∼18 – 45 nT during disturb days.
Automated georeferencing of Diwata-2 multispectral imagery using feature matching
Authors: Brotoisworo P , Aranas RK , Felix MJ 
Published: March 2022

Abstract
The Diwata-2 microsatellite is a 56 kg optical microsatellite that features different optical sensors such as the medium resolution Spaceborne Multispectral Sensor (SMI) and a high-resolution sensor called High Precision Telescope (HPT). This research aims to develop an automated georeferencing workflow for coregistered multiband HPT and SMI imagery with a GSD of 5 meters and 127 meters respectively. Georeferencing is done using a mixture of FAST and SIFT feature matching algorithms where HPT imagery used SIFT descriptors and detectors and SMI used FAST detectors and SIFT descriptors. The research used freely available Landsat- 8 imagery which was processed into cloud-free mosaics as reference data. Accuracy assessment is automated using AROSICS software which performs geometric correction and calculates the RMSE of local shifts based on image tie points which are automatically generated using the Diwata image as secondary image and Landsat-8 as reference image. Output of the feature matching algorithms has achieved high accuracy with an average RMSE value of 2.55 meters for HPT imagery and 65.96 meters for SMI imagery. Both RMSE values are close to half the GSD of both sensors which indicate sub-pixel precision. Future research for this method includes additional method for keypoint filtering to further increase the accuracy of the feature matching.
Correlating between global solar radiation and greenhouse gases over Nigeria
Authors: Ibeh G F , Sombo T , Edebeatu Chinedu Callistus , Azi A O , Ogonna C A , Ekpe J E , Akande P I 
Published: March 2022

Abstract
The need to study the variations of climate change in Nigeria becomes necessary at a time the universe and Nigerians, in particular are passing through challenges due to climate change as a result of emissions. The atmospheric gases have a greater transparency for incoming solar radiation, while the outgoing are trapped and re-emitted back to the Earth. This study correlated between global solar radiation and greenhouse gases over Nigeria using neural network. The results showed that positive correlations exist between solar radiations: CO2 and CH4 respectively, while exhibiting negative correlations with tropospheric ozone and water vapour. Consequently, an increase in 0.1017, 0.1350 units of CO2 and CH4, respectively could enhance the trapping and transmission of solar radiation in the atmosphere, while an increase of 1.1234 and 0.1530 units of tropospheric ozone and water vapour could cause absorption of solar radiation. The trapped energy is re-radiated back to the Earth, this warms up the atmosphere and the surface of the Earth resulting to global warming. Coefficient of determination revealed that 18%, 30%, 20%, and 29%, of the variances of solar radiation being studied is explained by the variance of the water vapour, tropospheric O3, CO2, and CH4, respectively.
Random sequential adsorption of rounded rectangles, isosceles and right triangles
Authors: Cieśla Michał , Kozubek Konrad , Kubala Piotr 
Published: March 2022

Abstract
We studied random sequential adsorption (RSA) of three classes of polygons with rounded corners: rectangles, isosceles triangles, and orthogonal triangles. Using the algorithm that enables the generation of strictly saturated RSA packing, we systematically determined the mean saturated packing fraction for RSA configurations built by these shapes. The main aim was to find the figure that forms the densest random configuration. Although for rounded rectangles the packing fractions were lower than for discorectangles, the densities reached for some rounded isosceles and right triangles exceeded the highest known two-dimensional packing fraction for configurations built of unoriented monodisperse objects. The microstructural properties of several packings were discussed in terms of the two-point density autocorrelation function.
Study of bladder release agent formulas and methods to evaluate their efficiencies by using reciprocating tribometer
Authors: Tanboriphan N , Teeraprawatekul B , Mahathanabodee S , Jangchud I 
Published: March 2022

Abstract
Bladder is one of the most important components in tire manufacturing process. In tire industry, methods to prolong bladder service-life and good bladder coatings for non-stick surface has been acquired. Bladder coated with good release agents can help reducing nonconforming products and increasing production efficiency. In this work, semi-permanent release agent formulas were studied. A new method to evaluate release agent efficiency by using a reciprocating tribometer were also carried out. Polydimethyl siloxane (PDMS) release agent formulas were developed with and without polymethyl hydrogen siloxane (PMHS). Effects of metal salt cure catalyst were also studied. In this work, method of release efficiency test was developed by using a reciprocating tribometer according to ASTM G133-05. It can be used to determine coefficient of friction of the coated surface and durability of the coatings. Coating durability test was also confirmed by repeating compression molding test to determine the number of release cycles. It was found that film durability was improved by adding the metal salt catalyst and PMHS. As the PMHS loading was increased, film endurance was improved to an optimum loading. Friction coefficient of the coatings could be related to the mold release ability and durability of the release agents. The technique can be used to estimate the service-life of the coated bladders. It can be used as a guideline for development of mold release agents in tire manufacturing industry.
Influence of nanofiller types on morphology and mechanical properties of natural rubber nanocomposites
Authors: Wongvasana B , Masa A , Saito H , Sakai T , Lopattananon N 
Published: March 2022

AbstractNatural rubber (NR) nanocomposite containing different types of filler, i.e., nanoclay (clay) and cellulose nanofiber (CNF) were prepared in this study. The masterbatches of NR with 5 parts per hundred parts of rubber of nanofiller were firstly prepared by using the latex mixing method, followed by compounding on two roll mill and compression molding to obtain NR nanocomposite specimens. The unfilled NR sample was also prepared for comparison. Morphological properties of NR nanocomposites were investigated by using transmission electron microscopy, while the mechanical and dynamic properties were studied by using a universal tensile testing machine and dynamic mechanical analyzer (DMA). It was found that the clay with platelet morphology was uniformLy dispersed, while the long and flexible CNFs were aggregated and poorly dispersed. The greater improvement of modulus at various strains was achieved from CNF filled NR nanocomposites, while the highest tensile strength was obtained from the clay filled nanocomposite. As compared to the clay containing nanocomposite, the addition of CNF markedly decreased the tensile strength and elongation at break of the NR due to poor dispersion of CNF. However, a significant improvement in mechanical properties at low strain was obtained when the CNF was used as filler due to high degree of fiber entanglement, as suggested by DMA observation.
Effect of arecoline, aqueous and methanolic areca nut extracts on rumen fluke
Authors: Puyathorn N , Sukonpan C , Toungsuwan P , Narakornwit W , Phaechamud T 
Published: March 2022

Abstract
Paramphistomosis is a parasitic disease that causes a reduction of livestock production and economic losses worldwide. In order to avoid side effect and chemical residue from usage of chemical drugs, medicinal plant is an alternative drug for treatment. Areaca nut (Areaca catechu) which one of the domestic plants in Southeast Asia had antihelmintic activity. In this study, arecoline, aqueous and methanolic extracts of areca nut prepared in solutions were tested for antihelmintic activity against rumen flukes (Paramphistomum sp.). The parasites were incubated in a culture media (RPMI-1640, pH 8) at 39°C in a carbon dioxide-incubator containing 0.01, 0.1 and 1 mg/mL of the tested compounds for 15, 30 min, 1 h and 24 h. The results showed that the methanolic and aqueous crude extracts from seeds of Areaca catechu and arecoline HBr at concentration of 1 mg/mL solutions could destroy the tegument (surface membrane) of the flukes and killed them all at initial time. Thus, these areca nut extracts exhibited the potential alternative medicine with antihelmintic activity against rumen flukes.
Electrochemical performance of binder-free and flexible spinel NiCo2O4electrode
Authors: Somsongkul V , Thong-em A , Chaojeen P , Kongmark C 
Published: March 2022

AbstractThis research aims to study the one-step hydrothermal synthesis of a binder-free and flexible spinel nickel cobaltite (NiCo2O4) electrode for supercapacitor application. The hydrothermal synthesis method is well known to generate highly crystalline products, with high purity, narrow size distribution, and low aggregation of particles. The spinel NiCo2O4nanoparticles were grown on a flexible carbon cloth substrate under hydrothermal conditions at 130°C for various reaction times (1, 3 and 6 h). The morphology of NiCo2O4nanoparticles was tuned from nanosheet to nanowire by varying the hydrothermal reaction time from 1 h to 6 h. The electrochemical properties of NiCo2O4electrodes were investigated. The NiCo2O4electrode prepared for 6 h exhibited the highest anodic and cathodic current density and the lowest charge transfer resistance compared with the other electrodes.
Solid-state reaction synthesis and characterization of Mn-doped LiFePO4 cathode material
Authors: Kyaw A M M , Panomsuwan G , Munprom R 
Published: March 2022

Abstract
Olivine type LiFePO4 has great advantages for Li-ion batteries due to its non-toxicity, high safety, and good cycle life performance. However, its low-rate capability and low energy density make some challenges for this LiFePO4. Several methods like doping with transition metals were used, and Mn ion was used in this work to improve the overall electrochemical properties. LiMn
x
Fe1-x
PO4 is promising cathode material owing to high voltage, structural and chemical stability. However, the electrochemical performance of these materials depends on phases and structures obtained from synthesis. In this work, the effect of solid-state reaction conditions, including calcination temperature and duration, on morphology, structure, and electrochemical properties of LiMn
x
Fe1-x
PO4 cathode materials with the composition of x = 0.5 was investigated. The morphology, crystallography and local structure of the synthesized materials were examined by field emission scanning electron microscope (FE-SEM), X-ray diffractometer (XRD) and Fourier-transform infrared spectrometer (FTIR), respectively. The surface area was also determined by the Brunauer-Emmett-Teller (BET) model. The effect of calcination temperature and reaction time upon the morphology, structures of the synthesized cathode materials were studied and discussed. The results could be essential for further development and employment of LiMn
x
Fe1-x
PO4 in Li-ion batteries.
High-harmonic generation (HHG) in silicene
Authors: Summueang C , Fudulwatjananon T , Boonchui S 
Published: March 2022

Abstract
Silicene, a freshly isolated silicon allotrope with a two-dimensional (2D) honeycomb lattice structure, is expected to have electrical properties comparable to graphene. Considering the certain external electric applying on silicene, we explore high-harmonic generation (HHG) effect and its factors. According to our investigation, the external electric field significantly influences the optical emission peaks of the low-frequency optical emission.
The effect of shot peening on corrosion performance of anodized laser powder bed fusion manufactured AlSi10Mg
Authors: Rautio T , Hamada A , Kumpula J , Järvenpää A 
Published: March 2022

Abstract
Anodizing is commonly used on aluminium to improve the surface properties of the product for better corrosion resistance and wear resistance. In this research, the anodizing of laser powder bed fusion (LPBF) manufactured AlSi10Mg parts which were subjected to prior shot peening (SP) were investigated. Anodized specimens were analysed using SEM imaging and the corrosion properties were examined considering the effect of residual stress relief heat treatment and the SP process. The results showed that the SP deteriorates the corrosion performance of the material as such, but together with the subsequent anodizing it resulted to the lowest corrosion current of all investigated structures. As the SP can be used to lower the surface roughness of the LPBF parts and to increase fatigue life as well, the results of this work further encourage the use of SP with anodizing.
Application of near infrared spectroscopy for quality evaluation in Para rubber industry
Authors: Siano D , Puttipipatkajorn A , Puttipipatkajorn A , Noypitak S , Terdwongworakul A 
Published: March 2022

Abstract
Quality of products manufactured from Para rubber was an important aspect for merchandizing. Near infrared spectroscopy in a wavelength range of 900 to 1700 nm, which was a rapid and non-destructive technique, was applied to create quality predicting models for various Para rubber products. Near infrared hyperspectral imaging (NIR-HIS) technique was implemented to predict dry rubber content (DRC) of cup lump. Classification of adulterated Para rubber sheet was investigated using NIR-HSI. And NIR portable system was also developed for moisture content determination of Para rubber timber. The results showed that the DRC of the cup lump could be predicted with high accuracy with the coefficient of determination (R2) of 0.99 and root mean square of error of prediction (RMSEP) of 0.64%. Regarding the Para rubber sheet, the sulphuric acid coagulated sheets was classified from the formic acid coagulated sheet very good accuracy of 98.3%. Finally, The NIR portable system was developed and could be used to determine the moisture content of the timber with R2 and RMSEP of 0.96 and 5.37%, respectively. The application of NIRS was successful and provided feasibility for development into a future commercial use.