bluuebunny/crossref_metadata_2025_split huggingface dataset:
Temporal variation in crustal shear wave splitting associated with a moderate earthquake around Nias Island, Indonesia
Authors: Syuhada S , Anggono T , Febriani F , Arifin J , Prasetio A D , Dewi C N , Hasib M , Sulaiman A 
Published: June 2022

Abstract
We investigate temporal variation in shear-wave splitting parameters of local earthquakes around Nias Island, the northern part of Sumatran forearc. We analyse a total of 79 high-quality splitting measurements recorded at a GEOFON seismic station (GSI) from 2009-2015. We observe that there is no clear time variation in the fast polarization of the splitting waves. On the other hand, an increase in the delay time of the splitting waves is found prior to a medium earthquake that occurred around the island in August 2010. Therefore, we suggest that this temporal change may be related to the change in crack geometry of rocks following the accumulation of the stress in the crust before the earthquake occurred.
Natural Radioctivity Of Rock And Potential Availability Of Uranium-Thorium Minerals In Indonesia
Authors: Adi Rahmansyah A.A , Srigutomo Wahyu 
Published: June 2022

Abstract
Radioactivity in rocks arises as a consequence of the presence of the radioactive elements uranium and thorium. These radioactive elements bond with other elements and form radioactive minerals that evolve on earth through a complex process that takes a very long time. In Indonesia, uranium and thorium mineralization are found in sandstone, metamorphic, volcanic types. volcanic, and intrusive. Generally, mineralization occurs due to hydrothermal processes caused by tectonic and volcanic activities. The potential for these radioactive minerals is spread from Aceh to Papua, with the highest concentrations found in Kalan (West Kalimantan), Mamuju (West Sulawesi), Sibolga (North Sumatra), and Bangka-Belitung. The main uranium minerals found are uraninite, davidite, cofinite, carnonite, while the main minerals for thorium are monazite and thorianite. Exploration of the potential content of nuclear minerals has been carried out by BATAN since 1970 until now. Interim results show that the potential reserves of uranium and thorium in Indonesia are 89,483 tU3O8 and 143,234 tTh, which is a combined number of hypothetical, inferred, and measurable potentials. More detailed exploration needs to be carried out in order to produce measurable reserve figures and also expand exploration to other areas that also have the potential for the presence of uranium and thorium mineralization.
Maintaining Favourable Fermentation Conditions in Sargassum Liquid Fertilizer Production using Siphon in A Two-Containers System Resulting in Acceptable Levels of Heavy Metals
Authors: Nurhayati  , Asmara Anjar Purba , Huslina Feizia 
Published: June 2022

Abstract
A U-shapedsiphon was used to connect two 600 mL disposed of mineral water-plastic bottles called container A and B. Container A served as a decomposer drum for mixingSargassum porridge, EM4 (effective microorganisms 4), organic nutrients, and water to allow an anaerobic fermentation to occur within 25 days.B was an aeration drum containing an acceptable volume of freshwater. Between these two containers, the siphon was set to bridge the air between containers above the suspension. There were 14 different configurations including a siphon with three different diameters (0.5, 1, 1.5 cm), four different lengths (16, 18, 20, 22 cm), and three different connections (connected to aeration drum, opened to air, closed). The last two configurations did not need the siphon. During the fermentation process, gas and heat were perceptibly released inone way-flowing from A to B and creating bubblesin Bleading to a maintained condition of the fermentation. As the one of main challenging aspects in the production of sargassum liquid fertilizer (SFL) is the considerable number of heavy metals, therefore, we measured some transition metals levels extracted in the filtrate post-25 days to estimate the safety level of the product compared to those mentioned in the Regulation of the Indonesian Ministry of Agriculture (Permentan70/SR/140/10/2011). All data excluding sample S4 were below the limit, except Cd level, whereby two configurations gave the least values of potentially toxic elements, which might be linked to the role of the siphon in giving a favourable condition for preventing the release of the heavy metals trapped in the cell walls.
Determination of Soil Corrosion Potential for Gas Pipeline Cathodic Protection System Planning
Authors: Solehudin A , Permana E , Salam H 
Published: June 2022

Abstract
Research has been carried out to identify the potential for soil corrosion for the design of the cathodic gas pipeline protection system. The research location is in Cimanggis - Bitung, West Java, which is located at coordinates 6°19’00 “- 6°28’00” South Latitude and 106°43’00 “- 106°55’30” East Longitude. Measurement of soil resistivity using the Wenner method which refers to ASTM G37, with variations in distance of 0.75m, 1.50m, 2.50m and 6.00m at each point. The number of measurement points is 185 points. DC electric current is injected into the ground, then the current and potential values between the electrodes are read on the device. Then the soil resistivity is calculated using the equation ρ = 2πAR. The results of the measurements are soil type resistance which is then categorized according to the level of corrosion. Based on the results of data processing and interpretation of soil resistivity, some locations have low to extreme corrosion rates. The degree of soil corrosion will affect the corrosion of buried pipes. Therefore, for these locations, planning and technical calculations are needed for the protection of the pipes to be installed.
Electrochemical Performance of Symmetric Supercapacitor Based on Activated Carbon Biomass TiO2Nanocomposites
Authors: Diantoro M , Luthfiyah I , Istiqomah  , Wisodo H , Utomo J , Meevasana Worawat 
Published: June 2022

AbstractA supercapacitor (SC) is an energy storage device with high energy density, high power density, long life cycle and a bundant material in nature.. Activated carbon based on coconut shell waste (ACCS) is one of the most promising supercapacitor base materials due to its abundance in nature, environmentally friendly, and high surface area. Activated carbon based on coconut shell (ACCS) waste is a potential material as a supercapacitor base material. This is because ACCS has undergone chemical and physical activation, has a high surface area, is abundant in nature, and is environmentally friendly. However, ACCS has common ionic transport diffusion, resulting in inefficient utilization of activated carbon surface area. Therefore, ACCS composite with TiO2material is needed. TiO2material with a small particle size can be used to reduce the aggregation so it can increase the electrolyte to an active redox site. Therefore, this research was conducted to obtain information about the most optimum activation method for ACCS biomass and the supercapacitors enhancement with ACCS-TiO2composite to obtain great ionic diffusion performance and an effective surface area utilization. In brief, the experiment was started by preparing the composite solutions with various compositions of TiO2(0%, 10%, 15%, and 20%). The deposition was carried out using the doctor blade technique on the aluminum foil based substrate and the liquid electrolyte of 1 M Et4NBF4was injected between the electrodes. The crystal structure, morphology, and elemental analysis of the composite were identified using X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM), and Energy Dispersive X-ray (EDX), respectively. Charge Discharge was applied to measure the electrical performance of the device. The highest performance of symmetric supercapacitor was performed by TiO215% that able to show its cyclic reversibility at the voltage range of 0-2 V, generated a specific capacitance of 53.10 F g-1with the power density and maximum energy density of 367.05 W kg-1and 26.15 Wh kg-1, respectively. Over 50 cycles, its maximum energy density was decreased to 24.83 Wh kg-1with the capacity retention of 94.64 %.
Modelling of Motion of a Volvox Colony using Many-Body System and Its Qualitative Comparison with Observations
Authors: Dini Septian Ulan , Nurafni Sevi , Fairuza Achmad Zacky , Taufik Intan 
Published: June 2022

Abstract
Approximately 500-60,000 volvox cells constructed a colony with a spherical or elliptical hollow form. Each cell can use its flagella to move. For a colony of hundred cells to perform a direct motion, there must be a coordination of the flagella. In this work, we assume that the cells already form the spherical colony and can perform some simple motion types, i.e., translational (TRAN), roll (ROLL), spin (SPIN), and superposition of the motions, and neglect detail of each flagellum. It is possible to map each cell in the colony using angular positions with a constant radius R and different θ _i and ϕ_i, where i = 1, 2,…, N with N is the number of cells constructing a colony. The center of the colony is R = (x, y, z). The TRAN mode can be obtained, wherex(t) = x(0) + υxt, y(t) = y(0) + υyt, z(t) = z(0) +υzt, ROLLmode with θ(t) = ω(0) + ωθt and SPIN with ϕ(t) = ω(0) + ωϕt. Through the available observation video, the model of volvox colony motion is also shown to have a qualitative agreement.
Monte Carlo simulations for quantum harmonic and anharmonic oscillators within epistemically restricted phase-space representation
Authors: Kholili M J , Rifianti S A , Latifah E , Nugraha A R T 
Published: June 2022

Abstract
We investigate Monte Carlo simulations within the epistemically-restricted phase-space (ERPS) representation of quantum mechanics for harmonic and anharmonic oscillators. Compared to the variational Monte Carlo (VMC) simulations in the conventional representation, the calculation time in the ER phase-space representation is quite competitive. We also numerically show that the distribution function of the global random variable on the order of Planck’s constant in the ER phase-space representation does not significantly affect the energy accuracy, yet a particular choice of the distribution function may give a better calculation time. This work gives an alternative approach to the Monte Carlo simulations beyond those in the conventional representation of quantum mechanics.
The Effect of Molecular Orientation in Disperse Red-1 Film on Its Refractive Index
Authors: Herman H. , Narayana I.G. , Hidayat R. 
Published: June 2022

Abstract
The refractive index of materials is an important physical quantity in the design of various photonic devices. For thin-film based devices, the fabrication method should be compatible with existing processes in microelectronic fabrication and allow for controlling the refractive index. In this research, the material used is a polar Disperse Red 1 (DR1) molecule. The film fabrication was carried out using the physical vapor deposition method which had been equipped with an electric poling installation. The poling of the electric field during the deposition process was applied perpendicular to the substrate. The thickness measurement and the refractive index of the films were carried out using a reflectometer where the light was incident perpendicular to the substrate. The refractive index was determined by the multiple beam interference method. As a result, it was found that the application of an electric field causes a change in the orientation of the molecules, which were initially parallel to the substrate to become perpendicular. Increasing the field strength further reduces the number of molecules parallel to the substrate. This correlates with a decrease in the refractive index of the film.
Inflation with Einstein-Gauss-Bonnet, non-minimal, and non-minimal derivative couplings: the constant-roll condition
Authors: Supriyadi I , Hikmawan G 
Published: June 2022

Abstract
In our research, we consider and study the inflation theories of Einstein-Gauss-Bonnet, minimal, non-minimal, and non-minimal derivative coupling with the constant-roll condition. Given the gravitational wave event, GW170817, which produces the speed of gravitational waves that was almost equal to the speed of light in vacuum, we constrain that the speed of the tensor perturbation was nearly equal to unity,

c
T
2

≃
1

. We involve a scalar field potential whose function can be obtained from an equation of motion by choosing the Gauss-Bonnet coupling functions. We use the linear and quadratic coupling functions, which are their simplest functions. The one result obtained are able to produce observed quantities such as the spectral index for scalar perturbation, ns
= 0.9642, the spectral index for tensor perturbation, nT
= −5.2471 × 10−4, and tensor-scalar ratio, r = 0.0041, which are compatible with the newest Planck data using the slow-roll parameters obtained analytically.
Fabrication of Polyvinylpyrrolidone (PVP) Nanofibrous Membranes using Mushroom-Spinneret Needleless Electrospinning
Authors: Latiffah Efa , Agung Bertolomeus Haryanto , Hapidin Dian Ahmad , Khairurrijal Khairurrijal 
Published: June 2022

AbstractMushroom-spinneret is an improved spinneret design for needleless electrospinning apparatus, which has a bowl-shaped base with a mushroom-shaped cover. The mushroom spinneret can overcome some limitations that is often associated with the needleless electrospinning technique, i.e., high excitation voltages, poor stability of free liquid, and difficulty of controlling the spatial motion of multiple jets. In this study, we fabricate polyvinylpyrrolidone (PVP) nanofibrous membranes using mushroom-spinneret needleless electrospinning and determine the effect of solution concentration and applied voltage on the fiber morphology and diameter. The solution concentration had significant effect on the fibers diameter. When the solution concentration was increased from 8 wt% to 12 wt%, the average fibers diameter increased from 0.99 μm to 1.31 μm and the fibers diameter distribution became wider. Moreover, the average fiber diameter decreased from 1.31 μm to 1.16 μm when the applied voltage was increased from 30 kV to 45 kV. The coefficient of variations (CV) for all membrane samples ranged from 0.12 - 0.26, indicated uniform fibers.
Development of COVID-19 Detection Using SPR Sensors: A Preliminary Result
Authors: Feraliana  , Khoirunnisa SZ , Septiani NL W , Iqbal M , Sutarti T , Nugrahapraja H , Yuliarto B 
Published: June 2022

Abstract
Coronavirus disease or COVID-19 is a virus from the Coronaviridae family that has caused pandemics throughout the world since the end of 2019. The virus spreads ten times faster through human interaction than SARS-CoV. The RNA sequence of COVID-19 has a 79.5% similarity with SARS-CoV. Fast and specific detection of COVID-19 is needed so that patient detection can be done quickly and accurately. One method that can be developed as a COVID-19 biosensor is aptamers-based biosensors. The aptamer is an artificial oligo nucleic acid that can specifically bind to target molecules. The aptamer is easily and chemically modifiable for increasing stability and reducing toxicity. It shows a comparable affinity for the target virus and better thermal stability than monoclonal antibodies. This advantage makes aptamer a promising candidate in diagnostic and detection applications. The goal of this research is to use an RNA aptamer as the specific recognition element in a portable surface plasmon resonance (SPR) biosensor for the detection of COVID-19 in humans. An aptamer RNA 1 COVID-19 was designed using the COVID-19 sequence from GISAID using the in silico method. End of 3’ aptamer RNA 1 was modified with dithiol. And Then, the aptamer was immobilized on the gold nanoparticle sensor surface via Cysteine-dithiol binding. The RNA solution, that had been extracted from swab samples, was diluted ten times before being used as a sample. The immobilized aptamer RNA 1 captured COVID-19 in RNA solution, causing an increase in refraction index (r.u). An aptamer RNA 1 was found to bind RNA virus of COVID-19 where the positive sample of COVID-19 has refraction index (r.u) between 3 r.u – 10 r.u for various Ct values.
Study of photon orbit around magnetic black holes coupled to nonlinear electrodynamics
Authors: Habibina A S. , Ramadhan H. S. 
Published: June 2022

Abstract
In this work we study the orbit of light particles around a asymptotically at, magnetically charged black hole which is coupled to a model of nonlinear form of Maxwell electrodynamics. The matter source is characterized by two parameters, β and γ, which determine the behaviour of photon around the corresponding spacetime. We serve the effective potential and analyse its change by varying the charge and the model parameter. Finally, we solve its orbit equation and show how photon moves according to the black hole potential.
Numerical Investigation of Freeze Valve Melting Behavior in Molten Salt Reactor using OpenFOAM
Authors: Riupassa Robi Dany , Basar Khairul , Novitrian  , Waris Abdul 
Published: June 2022

Abstract
Molten Salt Reactor (MSR) used a freeze valve to handle accident conditions when the reactor overheated and the active safety control systems failed. The freeze valve will melt if the reactor core temperature increases and exceeds the freeze valve’s melting temperature. In this research, a numerical investigation of freeze valve melting behavior was conducted. Freeze valve geometry used geometry proposed by Oak Ridge National Laboratory (ORNL) in Molten Salt Reactor Experiment (MSRE) and also used in test loop facility in Shanghai Institute of Applied Physics (SINAP) to develop Thorium Molten Salt Reactor (TMSR). The material used FLiNaK salt (LiF-NaF-KF, 46.5-11.5-42.0 mol %). Numerical calculation performs using OpenFOAM. BuoyantPimpleFoam was used to analyze the heat transfer mechanism. Isothermal phase-change simulated by adding solidificationMeltingSource terms into fvOptions as a flexible framework in OpenFOAM.
Improvement of Tobacco Collection Line and Storage Logistics System
Authors: Sheng Xiaohe , Wang Rui , Zhu Yi , He Xiaoqiang , Guo Ge 
Published: June 2022

Abstract
To innovate the traditional cigarette collection mode of manual unloading, open stacking and lower informatization, adopt the new cigarette packaging frame system and storage logistics system of the flue-cured tobacco. Take advantage of lifting platform, slope conveyor, roller conveyor, belt conveyor, automatic sampling device, shaping and framing device, palletizer, electric forklift, tobacco frame, assemble them to finish ten production line. After actual production, ten production lines running can complete the unloading and framing task of five cigarette trucks at the same time, another five trucks make preparation for the next mission. 3200 loads can be unloaded in an average of one hour. According to the design capacity, the unloading efficiency of one line is increased by about 20% year-on-year, rate of tobacco crushing is decreased by about 0.165%. The new tobacco collection and storage logistics system model can reduce tobacco crushing effectively, improve the efficiency of tobacco industry commerce handover and information data’s utilize.
Research and Implementation of the Transmission Efficiency of LEO Remote Sensing Satellite Based on Variable Coding Modulation
Authors: Jie He , Lei Shi , Wei Qiao , Jingyang Zhang , Xiaodong Wu , Zhenli Yin , Zhen Qin 
Published: June 2022

Abstract
Orbit characteristics of LEO remote sensing satellite determine that its downlink capability is limited by transit visual time, the limited number of transit times a day greatly limits the efficiency of satellite transmission. Because the satellite-ground transmission distance will change with the elevation angle of the ground station and the change of the satellite azimuth and elevation angle when the satellite transits, the traditional satellite can't make full use of the link margin in order to ensure the transmission of the longest distance, too much link allowance at high elevation when using fixed modulation mode. Therefore, based on variable coding modulation, the real-time transmission distance is obtained by using servo controller and intelligent calculation method on satellite, through simulation analysis and threshold analysis setting, this paper proposes a more optimized data transmission system design, which can save a lot of satellite-ground link margin and improve the satellite-ground transmission efficiency by about 30%.
Neural Network Application in Dispersion Curve Inversion of Seabed Geoacoustic Parameters
Authors: Zhang Peng , Pan Xiang 
Published: June 2022

Abstract
This paper estimates seabed shear-wave velocities and the thickness of the surface sediments using Scholte wave dispersion curves extracted from data. Common surface wave dispersion curve inversion methods are divided into: local linearization methods and global optimization methods. These are model-driven, the inversion process takes a lot of time, and it is easy to get a local optimum, and the inversion results are inaccurate. Aiming at the shortcomings of the existing surface wave dispersion inversion methods, this paper introduces an inversion method based on neural network, and fits the Scholte wave dispersion curve to obtain the geoacoustic parameters of the surface sediments. Neural network inversion is data-driven, and the model is extracted from the data, which can improve the speed and accuracy of surface wave inversion. By simulating the shallow sea model, better results are obtained, and at the same time, the experimental data is used for calculation, the inversion results are close to the traditional methods, and the inversion speed is improved.
Target Recognition of Millimeter-wave Radar based on YOLOX
Authors: Sun Qiang , Chen Xin , Liang Futai , Tang Xiao , He Song , Lu Hao 
Published: June 2022

Abstract
The application of magnetic field detector in the actual road section mainly depends on the layout of these detectors in the actual traffic environment. For example, geomagnetism and coils are easily disturbed by vehicles near the road, resulting in missed or false detection; Video detection equipment depends on weather, visibility and other environmental conditions, and there will be a large degree of missed detection. Compared with the disadvantages of the above sensors, Millimeter-wave Radar has many unique advantages, including insensitivity to light or weather, wider application range compared with vision based technology, and higher accuracy,which makes millimeter-wave radar more outstanding in traffic monitoring applications. This paper presents a detection model of millimeter wave radar spectrum based on YOLOX, which is used to monitor traffic. Firstly, this paper enhances the millimeter-wave radar spectrum data used for training by gray-scale transformation, solves the problem that the Doppler target echo is not obvious, and obtains a clearer target image. Secondly, the latest YOLOX algorithm is used to train 2844 radar spectrum diagrams, and the performance evaluation is carried out to obtain the YOLOX average mAP@0.5 The value is 0.916 and FPS is 35.8. Finally, experiments show that YOLOX algorithm is better than YOLOv5 algorithm mAP@0.5 It is 2.9% higher, which proves the superiority of the algorithm.