bluuebunny/crossref_metadata_2025_split huggingface dataset:
Merger rate of charged black holes from the two-body dynamical capture
Authors: Liu Lang , Kim Sang Pyo 
Published: March 2022

Abstract
We consider the two-body dynamical capture of black holes carrying U(1) charge which can not only correspond to electric or magnetic charge but also have other physical interpretations such as dark or hidden charge. In the low-velocity and weak-field regime, we study gravitational and electromagnetic radiations from point masses with U(1) charges in a hyperbolic orbit, and we develop a formalism to derive the merger rate of charged black holes from the two-body dynamical capture. We apply the formalism to find the effects of the charge-to-mass ratio on the merger rate for possible different cases and discover that the effects depend on the models.
Drag force on a moving heavy quark with deformed string configuration
Authors: Tahery Sara , Chen Xurong 
Published: March 2022

Abstract
To study drag force on a moving heavy quark through a plasma, we use a deformed AdS space-time, in which deformation parameter c describes non-conformality in AdS/QCD. In this case, the quark is mapped to a probe string in the AdS space. Considering the probable contribution of the deformation parameter in the probe string, we apply a general form of c-dependent string ansatz in the drag force computation. Then, we find the acceptable value of this parameter as it satisfies QCD calculations. Using this result, we also discuss the diffusion constant which is in agreement with the phenomenological result for the non-relativistic limit. Also, we show that while in absence of a deformation parameter, the probe string is a strictly increasing function of radial coordinate, the c-dependent probe string has a maximum value versus z.
Possible shape coexistence in odd-A Ne isotopes and the impurity effects of Λ hyperons *
Authors: Sun Qian-Kun , Sun Ting-Ting , Zhang Wei , Zhang Shi-Sheng , Chen Chen 
Published: March 2022

Abstract
In this study, shape evolution and possible shape coexistence are explored in odd-A Ne isotopes in the framework of the multidimensionally constrained relativistic-mean-field (MDC-RMF) model. By introducing

and

hyperons, the impurity effects on the nuclear shape, energy, size, and density distribution are investigated. For the

interaction, the PK1 parameter set is adopted, and for the

interaction, the PK1-Y1 parameter set is used. The nuclear ground state and low-lying excited states are determined by blocking the unpaired odd neutron in different orbitals around the Fermi surface. Moreover, the potential energy curves (PECs), quadrupole deformations, nuclear r.m.s. radii, binding energies, and density distributions for the core nuclei as well as the corresponding hypernuclei are analyzed. By examining the PECs, possibilities for shape coexistence in

Ne and a triple shape coexistence in 31Ne are found. In terms of the impurity effects of Λ hyperons, as noted for even-even Ne hypernuclear isotopes, the

hyperon exhibits a clear shrinkage effect, which reduces the nuclear size and results in a more spherical nuclear shape. The

hyperon occupying the

orbital is prolate, which causes the nuclear shape to be more prolate, and the

hyperon occupying the

orbital displays an oblate shape, which drives the nuclei to be more oblate.
Hydrogen maser magnetron cavity with low frequency-temperature coefficient
Authors: Van der Beken E , Léonard D , Bastin T 
Published: March 2022

Abstract
In this paper we show how a proper dimensioning of a magnetron cavity and its inner bulb allows one to design a hydrogen maser atomic clock with an arbitrary low frequency-temperature coefficient (FTC) for its cavity. The control of this parameter is of primary importance for the overall stability of the atomic clock. To this aim, a model based on finite element method has been developed to simulate thermal expansion of hydrogen maser cavities and evaluate the FTC. The model has been confronted with direct experimental data and very good agreement is observed. A key geometrical parameter is identified that allows for a strong tuning of the FTC, so as to set it down to values a priori as close as desired to 0, with limitations only dictated by the machining tolerances of the mechanical elements of the hydrogen maser cavity.
The effect of alumina addition on the synthesis of zeolite from fly ash by hydrothermal method
Authors: Budiman A W , Nugrahaningtyas K D , Purnama S D P W , Nabila A K , Gerard P I , Wulansari D W T , Sabiilagusti A I , Arvianto R I 
Published: March 2022

Abstract
ZSM-5 and analcime were successfully synthesized from coal fly ash using hydrothermal method in alkaline solution. The fly ash used was taken from the Paiton PLTU, one of the largest steam power plants in Indonesia. The fly ash was purified using sulphuric acid for 30 minutes and it was found that it has 17.7 wt.% of Si content and 2.79 wt.% of Al content. The zeolite synthesis was carried out in a hydrothermal reactor at 160 oC and 3 bar for 48 hours both with and without alumina addition. Subsequently, the zeolite produced was then calcined and characterized using X-ray diffraction (XRD) analysis. The results showed that ZSM-5 crystals were obtained from the hydrothermal process without alumina addition. On the other hand, the addition of alumina has a large impact on the hydrothermal process, which formed analcime crystals as the final product. Furthermore, the ZSM-5 and analcime produced have great correspondence to ICSD (Inorganic Crystal Structure Database) standards (no. 61010 for ZSM-5 and no. 34877 for analcime).
The effect of using solvent medium in the ultrasonication of silica precipitates
Authors: Febriana E , Angelina E , Mayangsari W , Handayani M , Irawan J , Prasetyo A B , Sulistiyono E , Muslih E Y , Nugroho F , Firdiyono F , Sutanto Hadi 
Published: March 2022

Abstract
In this study, further processing of silica precipitated from sodium silicate was carried out using an ultrasonic transducer. The ultrasonication process was carried out with the aim to obtain smaller particles and uniform distribution of silica precipitated. The ultrasonication process was carried out using three solvents medium in water, ethanol, and ethylene glycol. The effect of solvents used on the distribution and particle size of silica precipitated was observed using Scanning Electron Microscopy-Energy Dispersive X-Ray (SEM-EDX) and Particle Size Analyzer (PSA). From the results of observations using FE-SEM, it was shown that the ultrasonication of silica precipitates with water has the greatest influence on particle size and distribution. While the analysis using PSA did not show any size reduction due to the agglomeration between the particles. The smallest particle size that could be obtained from this process is about 17 nm with average value of 88 nm.
ZnO/NiO synthesis and its characterization using solvothermal method
Authors: Syahdarani E , Ramelan A H , Wahyuningsih S , Subagio A , Kartini I , Kawuri K R 
Published: March 2022

Abstract
This research aims to understand the influence of ZnO and NiO molarity towards its optical and morphological properties. ZnO/NiO was synthesized using solvothermal method with ZnO and (Ni(NO)3)2.6H2O as its main ingredients and dissolved in ethanol. The synthesis of ZnO/NiO using solvothermal method was carried out by modifying the variation of ZnO concentration with the ratio of ZnO and NiO were 1:1, 2:1, and 3:1. ZnO/NiO was used as a semiconductor material which will be analysed for optical properties that occur, one of which was band gap energy. The result was then characterized by X-Ray Diffraction (XRD) showed that the crystal size of the sample at 3:1 is the largest. Furthermore, the Fourier Transform Infrared Spectroscopy (FTIR) analyst indicated that the sample corresponds to C=C and C-H bonds. Moreover, the UV – Vis analyst showed that the absorption range is between 300-400nm indicated the extended UV-Vis absorption property of mixed oxide.
Chemical profiling of steam distillation clove bud oil from local producer in Karanganyar using GC-MS
Authors: Rakhmawati R , Ashari S N , Yugatama A 
Published: March 2022

Abstract
Abstract Indonesia is the world’s largest clove producer. The buds are used in the cigarette industry, but the waste still contains eugenol. This has helped local clove oil refiners grow by utilizing the waste, including clove bud oil (CBO) producer in Karanganyar. The level of eugenol derived from cigarette industry waste met SNI is still a problem for local producers. The purpose of this study was to determine the profile of CBO compounds from steam distillation using GC-MS. Oil characteristics are known by organoleptic tests and refractive index. CBO (steam distillation) profiling was carried out on four drums of different batches using the GC-MS “Shimadzu QP 2010 SE”. The columns used were Rtx-5MS. The detector used was FID and helium was the mobile phase. The eugenol level was determined by comparing the area of the peak obtained with the total area of eugenol standard. The results showed CBO had a clear light yellow color with a distinctive aroma of cloves and had a refractive index value of 1.5343. There were 10 compounds contained in CBO, namely eugenol; trans-caryophyllene; eugenol acetate; α-humulene; α-cadinene; α-copaene; cyclohexane 1,5-dimethyl-2,3-divinyl; caryophyllene oxide; naphthalene 1,2,3,4,4a,7-hexahydro-1,6-dimethyl-4-(1-methylethyl); and α-cubebene. The eugenol levels of each drum sequentially were 81.72, 82.94, 83.22, and 82.23% and all of them met SNI criteria.
Analysis of dose distribution in proton therapy for lung cancer with MCNP code
Authors: Rahmawati F , Khairunnisa A F , Riyatun  , Suharyana  
Published: March 2022

Abstract
Proton beam characteristics for proton therapy have been obtained by simulation method using MCNP6 software. The proton beam is modelled as a monodirectional disk with a diameter of 3 cm is 23 cm from the left lung cancer, a sphere with a diameter of 3 cm. The variation of proton beam energy that produces the best isodose in cancer cells is 94 MeV, 104 MeV, and 112 MeV fired alternately at the target from the left. The result is a total equivalent dose in cancer cells of (0.858 ± 0.003) Sv. The scattered amount received by healthy cells in the left lung was (1.39 ± 0.01) mSv, rib (0.12 ± 0.01) mSv, and skin (0.11 ± 0.01) mSv. According to the organ at risk (OAR) provisions, the scattered dose is declared safe. The simulation results prove that proton therapy is a cell targeting therapy. The dose used to kill lung cancer cells is 60 Gy, so with a proton beam of 1 µA, the total exposure time for therapy is (2.31 ± 0.01) minutes.
The potential of polyvinylidene fluoride (PVDF)-kaolin membrane for water treatment
Authors: Ismoyo Y A , Sejati G P W , Pranoto  , Pramono E 
Published: March 2022

Abstract
Polyvinylidene fluoride (PVDF)-kaolin membrane has been successfully fabricated. The addition of kaolin is aimed to optimize the performance of PVDF membrane for water treatment. Kaolin was prepared using 0.1 N HCl to activate the material. The fabrication of membranes was using phase inversion with 6 variations on PVDF composition within the membrane. FTIR analysis on kaolin activation shows minor changes on peak intensities and broadness without any addition or loss peak that indicates there is no reaction and only activation is occurred. The addition of kaolin affects the pure water flux. All of modified membranes shows gradually change on porosity and hydrophobicity properties under the contact angle measurement.
Validation of UV spectrophotometric method for ketoprofen multicomponent crystals with malic acid and tartaric acid
Authors: Syamdini C F S , Muthiah I K , Ainurofiq A 
Published: March 2022

Abstract
These multicomponent crystals are formed by two chemical substances, between ketoprofen and their co-formers, which are malic acid and tartaric acid. Analysis of multicomponent crystals showed a possibility of interference between constituents. To determine interference between pure drugs and their co-formers, a validated, fast, easy, efficient, and adequate analysis method is required. This study aims to evaluate and develop an analytical method validation that is accurate, specific, and reproducible on ketoprofen multicomponent crystals using UV-Vis spectrophotometry. The study was conducted by the dissolving of phosphate buffer with 7.4 pH with the addition of ethanol co-solvent to obtain calibration curve solution. The calibration curve was analyzed for linearity, accuracy, and precision. Meanwhile, the placebo interference parameter was measured on an equimolar ratio of 1:1 between ketoprofen and co-former. Validation result on the wavelength of 260.5 nm with a range of 1-16.834 µg/mL showed the linearity of R2 = 0.999 and intercept P-value > 0.05, accuracy of Recovery = 100.652%, precision of RSD = 0.568%, and placebo interference of 0%. Based on the results of this study, the UV-Vis spectrophotometer method for ketoprofen multicomponent crystals fulfilled the validation standard.
The synthesis of cuprous nanoparticles using chemical reduction method
Authors: Yokhebed N , Ramelan A H , Wahyuningsih S , Kawuri K R 
Published: March 2022

Abstract
This research’s purpose was to synthesis Cu nanoparticles by chemical reduction method. Copper (II) sulphate pentahydrate was used as the precursor and starch as a capping agent. Ascorbic acid was then added as a reductor. Sodium Hydroxide was slowly added and as the pH goes up, the yellow solution will turn ocher as a sign that Cu nanoparticles were formed. Afterwards, the Cu nanoparticles were characterized with XRD, SEM and UV-Vis. The XRD results shows the formation of cubic Cu2O nanocrystals with the mean crystal size of 134.76 nm, the UV-vis absorbance spectra were recorded highest between 311-446 nm and the FTIR spectra shows that the functional groups existing inside the synthesized NPs are vibrating Cu–O, stretching O–H, bending O–H, and carbon traces which were stretching C–H and bending C–O, caused by impurities from starch.
Synthesis of rGO-CoMoS composite using hydrothermal method as a counter electrode for dye-sensitized solar cells (DSSC)
Authors: Harjana  , Wahyuningsih S , Supriyanto A , Ramelan A H , Fathoni H I , Kawuri K R 
Published: March 2022

Abstract
Dye-sensitized Solar Cell (DSSC) technology is a good choice to convert sun energy into electrical energy, because of its low cost fabrication. One of the main components of the DSSC is the counter electrode, which is generally Pt based, while Pt is expensive and rare material, so replacement for Pt is needed. The rGO-CoMoS composite is a potential one. rGO was prepared from graphite which was oxidized by the hummer method. rGO-CoMoS was synthesized from GO, Cobalt, Molybdenum, and thiourea using a hydrothermal reaction at 200 oC, with various reaction times for 12, 24, and 36 hours. Time variation is done because the reaction time affects the character of the composite formed. The results of the synthesis were characterized by XRD, FTIR, SEM, and UV-Vis spectroscopy to prove that the synthesis was successful. Then the composite was coated on FTO glass to become a counter electrode, and sandwich fabricated with the arrangement of FTO/TiO2-N3-I−/I3
−-rGO-CoMoS/FTO. Then tested the current and voltage with Keithley to determine its efficiency as a DSSC. And the material that produces the best efficiency is rGO-CoMoS 36 with efficiency 0.00413%.
The effect of mixing Chlorophyll-Antocyanin as a natural source dye on the efficiency of dye-sensitized solar cell (DSSC)
Authors: Munandar M R , Hakim A S R , Puspitadindha H A , Andiyani S P , Nurosyid F 
Published: March 2022

AbstractSunlight is a natural alternative energy as a renewable energy source.Dye-Sensitized Solar Cell(DSSC) is third generation solar cell as a substitute for conventional solar cells made from silicon because it is easy to manufacture. One important part of DSSC is dye because it has an important role in light absorption, photoelectron production, and electron transfer processes to increase the efficiency of electrical energy conversion. Modification of dye as an active material for DSSC as an effort to improve the performance of optical properties and photoconductivity of the dye. Mixing chlorophyll dye with anthocyanin dye aims to widen the area of the visible light absorption band. Chlorophyll dye obtained from green spinach extract and anthocyanin dye obtained from red rose extract. Absorbance test using UV-Vis Spectrophotometer obtained a widening of the light absorption range at 400-700 nm. The conductivity test usingKeithley I-V meter 2602Ato determine the dye’s ability to conduct electric current, the best conductivity was obtained in the 1:2 chlorophyll-anthocyanin mixture is 4.83 x10−2Ω−1m−1. TheI-VDSSC test usingKeithley I-V meter 2602Aobtained the best electrical energy conversion efficiency in the 1:2 chlorophyll-anthocyanin dye mixture is 5.8 x10−2%.
A First Look at Structural Properties of Long HP Model Sequences
Authors: Farris Alfred C.K. , Landau David P. 
Published: March 2022

Abstract
The longest sequence in the literature of the HP model of protein folding is studied on a simple cubic lattice using replica-exchange Wang-Landau sampling. We find a lower ground state energy than found in previous studies, and, for the first time, study the structural and thermal behavior of this sequence during the folding process.
An agent-based modeling and simulation for the first stage of honeycomb construction
Authors: Narumi Takayuki , Akiyama Takumi , Kageyama Maya , Uemichi Kenta , Honda Hisao , Osaki Koichi 
Published: March 2022

Abstract
Honeybees construct nests that consist of well-arrayed cells. In the first stage of honeycomb construction, they build a linear sequence of tetrapod structures that form the basis of the honeycomb. However, it is unknown how honeybees produce that initial pattern. To understand the mechanisms of honeycomb construction, we proposed an agent-based model, the attachment-excavation model, in which worker honeybees are classified into attachers and excavators. Simulation results showed that a tripod pattern emerges due to competition between the attachers and excavators. As time advances, isotropic wax growth causes the tripods to spread concentrically. We then employed anisotropic wax growth to obtain a linear sequence of constructed tripods. In the present paper, we discuss the origin of the anisotropy based on experimental results.
Pursuit and Evasion: from singles to groups
Authors: Yoshihara Sota , Ohira Toru 
Published: March 2022

Abstract
We provide a brief review of the current status of the traditional problem of pursuit and evasion. The new approach proposed by Eliezer and Barton is presented with an example of the one-to-one pursuit and evasion. Consequently, we describe recently proposed “Group Chase and Escape” and its characteristic behaviors. The directions of possible topics for future investigations and possible applications are also discussed.
Optical Kerr Effect and Structural Tetrahedrality of Supercooled Water at Ambient Pressure
Authors: Tang Ping-Han , Kuo Yu-Wei , Wu Ten-Ming 
Published: March 2022

Abstract
The correlation between the optical Kerr effect (OKE) spectroscopy of supercooled water at ambient pressure and its structural tetrahedrality was investigated by contrasting simulation results of two non-polarizable water models modified with the same collective polarizability, which involves intrinsic molecular polarizability and induced polarizability arising from interactions between molecular dipoles. The tetrahedrality of water structure was typified with the second-peak maximum in the pair distribution function of oxygens and the fraction of molecules, which and their neighbours up to the second hydration shell all have four H-bond coordinators. Our results indicate that the intermolecular vibrational band in the OKE spectrum of supercooled water is considerably correlated to its structural tetrahedrality.
Effect of Coulomb interaction between secondary electrons on plasma formation due to heavy-ion irradiation
Authors: Moribayashi Kengo 
Published: March 2022

Abstract
Plasma formed by heavy-ion irradiation has been investigated in this study. In this study, a simulation model that effectively uses recent computers is developed. The effect of Coulomb interaction between secondary electrons on the motion of secondary electrons and plasma formation is demonstrated, where the secondary electrons are the electrons produced by incident ion impact ionisation.
Collective pattern formation in a binary mixture of self-propelled particles
Authors: Adhikary Sagarika , Santra S. B. 
Published: March 2022

Abstract
We have studied the collective behaviour of a binary mixture of self-propelled particles (SPPs) with non-identical motile properties. The two types of SPPs with low and high velocity is modelled in a two-dimensional system with periodic boundary conditions (PBCs) at a fixed particle density. The two types have two widely different velocities. The alignment interaction rule and angular noise similar to Vicsek Model (VM) is implemented in this model. Both inter and intra-particle interactions are considered among the SPPs. The system exhibits various self-organised pattern formation and phase segregation which mainly depends on the angular noise present in the system. Without any restriction of interaction or repulsion among the particles, the SPPs phase-separated into dense structures. The orientational order-disorder phase transition is studied, and nontrivial results are obtained. Cluster size distribution (CSD) for the entire system is also studied at the transition region. The CSD exhibits a power-law behaviour at the transition, with an exponent that of the standard percolation.
Numerical simulations of spectroscopic properties in two-dimensional Mott insulator
Authors: Tohyama Takami , Shinjo Kazuya , Sota Shigetoshi , Tsutsui Kenji 
Published: March 2022

Abstract
We numerically investigate spectroscopic properties for a two-dimensional Mott insulator described by a half-filled Hubbard model on the square lattice. Firstly, we examine the spectral shape of the optical conductivity by using time-dependent density-matrix renormalization group implemented by the Legendre polynomial expansion. We find a shape peak resembling to an excitonic peak at absorption edge, whose origin is attributable to antiferromagnetic correlation in the spin background. We next investigate momentum-dependent transient charge and spin dynamics after photoirradiation by using time-dependent Lanczos-type exact diagonalization. We find a temporal oscillation in the intensity of the dynamical spin structure factor, which exhibits an antiphase behavior between, for example, two orthogonal momentum directions parallel and perpendicular to the electric field of a pump pulse. Observing such antiphase oscillations will be a big challenge for time-resolved resonant-inelastic x-ray scattering experiments.
Quantum Monte Carlo simulations of highly frustrated magnets in a cluster basis: The two-dimensional Shastry-Sutherland model
Authors: Honecker Andreas , Weber Lukas , Corboz Philippe , Mila Frédéric , Wessel Stefan 
Published: March 2022

Abstract
Quantum Monte Carlo (QMC) simulations constitute nowadays one of the most powerful methods to study strongly correlated quantum systems, provided that no “sign problem” arises. However, many systems of interest, including highly frustrated magnets, suffer from an average sign that is close to zero in standard QMC simulations. Nevertheless, a possible sign problem depends on the simulation basis, and here we demonstrate how a suitable choice of cluster basis can be used to eliminate or at least reduce the sign problem in highly frustrated magnets that were so far inaccessible to efficient QMC simulations. We focus in particular on the application of a two-spin (dimer)-based QMC method to the thermodynamics of the spin-1/2 Shastry-Sutherland model for SrCu2(BO3)2.