bluuebunny/crossref_metadata_2025_split huggingface dataset:
Passively Q-switched Er-doped fiber laser based on carbon-doped silver nanoparticles saturable absorber prepared using laser ablation method
Authors: Asghar Haroon , Ahmed Rizwan , Umar Zeshan A , Alrebdi Tahani A , Baig M Aslam 
Published: April 2024

Abstract
In this work, we investigate the effect of carbon-doped silver nanoparticles on the Q-switched performance of erbium-doped fiber laser (EDFL). The carbon-doped silver nanoparticles were synthesized using a laser ablation method. The prepared nanoparticles were inserted between fiber ferrules using the adhesion process of the index-matched gel. Incorporating a saturable absorber inside the laser cavity initiates a stable Q-switched mechanism at 11.2 mW of threshold power. The measured results demonstrate that as the pump power of EDFL increases from 11.2 to 267 mW, the pulse repetition, and pulse width tuned from 21.33 to 95.2 kHz and 13.3–3.18 µs, respectively. At 267 mW of pump, the maximum average output power, pulse energy, and peak power were further measured to be 2.36 mW, 24.68 nJ, and 7.76 mW, respectively. Besides, the stability and threshold characteristics of EDFL based on carbon-doped silver nanoparticles were further explored. This study shows that the synthesis of metal nanoparticles using the laser ablation technique and their implementation as saturable absorber represents a promising avenue for advancing ultrafast laser technologies with improved stablility, efficiency, and tunability.
Earthquake Events Detected by Continuous Gravimeters in Indonesia
Authors: Gunawan I , Wahyudi E J , Alawiyah S , Kadir W G A 
Published: April 2024

Abstract
Earthquake monitoring and early warning systems play a critical role in mitigating the impact of seismic events on human lives and infrastructure. Continuous gravimeters, sensitive instruments designed to measure second changes in gravitational forces, have emerged as valuable tools for earthquake detection and monitoring. This paper reports the significance of continuous gravimeters in detecting earthquake events, highlighting their principle of operation and contributions to seismic research. In contrast to traditional seismic sensors, continuous gravimeters offer a unique perspective on seismic activity by detecting mass redistributions resulting from the movement of Earth’s tectonic plates during an earthquake. This capacity enables them to capture the initial moments of an earthquake, contributing to early warning systems that can provide critical seconds to minutes of advance notice, enhancing preparedness and response efforts. Some earthquake events were detected by the gPhoneX gravimeters (numbers #123 and #126) placed in Institut Teknologi Bandung, Ganesha Campus. Four possible location events matched with the timeframe of the seismometer recording data on June 15, 2023. This result shows that continuous gravimeters have the potential capability to advance earthquake monitoring and early warning capabilities. By offering a complementary approach to seismic sensors, these instruments broaden our understanding of earthquake dynamics and contribute to developing more robust and effective strategies for mitigating seismic hazards.
Machine Learning Implementation on TTV Analysis using TTVFast
Authors: Ikhsan M I , Arifyanto M I , Hidayat T 
Published: April 2024

Abstract
Exoplanet research has undergone rapid development lately due to the increasing number of space telescopes and satellite surveys launched in recent years. Two missions with the most exoplanet discoveries using transit methods are Kepler and TESS missions. Both missions focused on photometric surveys to detect planets by observing the periodic dimming of a stars brightness as a planet passes in front of it. There is another method that could take advantage of transit observations called transit timing variation method. By observing the deviation of the transit time of transiting planet we could infer the existence of another body in the system. Performing exoplanet parameter estimation using TTV data is an extensive process. Estimating exoplanet parameters using TTV, we must fit the TTV data using a wide range of parameters using n-body simulation. N-body simulation in this scale is computationally costly. To estimate planet parameters, we need to run thousands of n-body simulations. With the increasing trend of using machine learning methods in the research process, we try to implement the machine learning method to make TTV analysis more effective and efficient. We implement the application of machine learning to n-body simulation using REBOUND and TTVFAST and compare the results. REBOUND is a Python-based library designed for simulating the dynamics of n-body systems, particularly celestial bodies like planets, stars, and other objects that interact gravitationally. While TTVFAST is a modified n-body simulation code that is specifically designed to calculate TTV on transiting planetary systems. We found that TTVFAST is much faster than REBOUND when generating samples for training and testing while still maintaining similar accuracy. Also, the machine learning model generated from both data samples is performed similarly.
Analysis of two-dimensional magnetotelluric inversion for the delineation of the petroleum system in the Kutai basin, East Kalimantan, Indonesia
Authors: Muttakhin A N I , Hamidah N N , Hapsoro C A , Zulaikah S 
Published: April 2024

Abstract
The Kutai Basin in East Kalimantan is known as a potential area for oil and gas exploration. Two-dimensional magnetotelluric (MT) analysis is applied to investigate the geological structure and distribution of subsurface resistivity. This study aims to delineate the petroleum system using MT data and identify zones with potential for the accumulation of hydrocarbons. MT data has been collected at several strategic locations in the Kutai Basin, and two-dimensional cross-sections have been constructed to obtain vertical resistivity imaging at several depths. In this study, there were nine measurement points located on one line. The data is then inverted to obtain a two-dimensional resistivity model, which qualitatively represents the subsurface structure. The results of this study indicate that there is a low resistivity anomaly zone that identifies the presence of source rock with a resistivity value of 1-12 Ωm. In this line, it is suspected that the petroleum system that allows trapped hydrocarbons is found in the area, below the KT36 and KT13 measurement points. In this area there are folded structures in the form of synclines and anticlines, which raises suspicions about the types of traps formed from structural traps.
Comparison of the SRP spherical model between LEO and GEO satellites
Authors: Pratiwi N , Herdiwijaya D , Hidayat T , Ikhsan M I 
Published: April 2024

Abstract
Solar Radiation Pressure (SRP) is a phenomenon caused by the pressure exerted by solar photons on a satellite’s surface when it is exposed to sunlight. It is a form of radiation force and can significantly impact the motion and behaviour of satellites in space. SRP influences a satellite’s orbit by causing changes in its semimajor axis, eccentricity, inclination, argument of perigee, right ascension of the ascending node, and mean anomaly. SRP models are used to simulate the effects of solar radiation pressure on satellites. These models are essential for accurately predicting satellite trajectories and orbital behaviour. There are several types of SRP models, such as spherical model, flat model, box-wing model, faceted model, and analytical SRP models. This research focuses on Telkom 1 and LAPAN A1 satellites, both belonging to Indonesia and positioned in Geostationary Earth Orbit (GEO) and Low Earth Orbit (LEO) orbits, respectively. The study aims to find a comparison of the effects of SRP spherical model on LEO and GEO satellites. Our modelling shows that the semimajor axis and eccentricity are sensitive to SRP, while the inclination and right ascension of the ascending node are not significantly affected. Comparing the effects of SRP on LEO and GEO satellites, we concluded that both LEO and GEO orbit experience the most significant fluctuations in January (perihelion), likely due to the influence of solar radiation pressure.
MASW (Multichannel of Analysis of Surface Waves) Measurements on Very Dense Fill of Freeport Mining
Authors: Handayani G , Masimuja G 
Published: April 2024

Abstract
The MASW (Multi-Channel Analysis of Surface Waves) was conducted on fill soil at Tembagapura Freeport Mining. The fill was very dense and is the landfills where people dumped waste disposal like car tire rubber etc. Several attempts were made to make boreholes to collect soil samples and to run SPT (Standard Penetration Test), but they failed. The fill was so dense that the employed drill bits were worn out when penetrating the soil. The MASW team was invited to carry out the measurements and to produce shear wave velocities of the layers, which correspond to SPT Number. The number of measured MASW points was 8 points. They were successfully carried out on the surface of the fill without borings. The offset distance between the hammer blows, and the first geophone was 18 m, and the interval distance between 4.5 Hz geophones was 3 m. The MASW measurements resulted in an average shear velocity of 400 m/s which confirmed the soil was very dense soil. The information regarding the shear wave velocities of the layers was adopted as input of earthquake engineering software to predict the amplification when the earthquake happens.
Fabrication of NiO@Ni(OH)2/Graphene Nanosheets//Carbon Electrode as Asymmetric Configuration in Coin Cell Supercapacitor
Authors: Diantoro M , Rahmadani H , Atturoifah N I M , Nasikhudin  , Zawaidah I C , Aripriharta  
Published: April 2024

Abstract
Electrochemical energy storage devices have emerged as a significant concern for contemporary society global and becoming a devices with great performance are in high demand. Supercapacitors are an alternative that is very suitable for use because of their high-power density, environmentally friendly, long-term cycle, safety, and abundance in nature. NiO and Ni(OH)2 nanoparticles have attracted global attention because of their varied application possibilities and advantages such as low toxicity, low cost, high theoretical capacitance, and environmentally friendly properties. NiO was composited with Ni(OH)2 in this study to enhance the supercapacitor device’s specific capacitance, energy density, and power density. The synthesis of NiO@ Ni(OH)2/Graphene electrodes used a blending method with mass variations of NiO (5, 10, 15, 20, 25) % as active material, and then was characterized using XRD to determine phase constituents and crystal size, SEM to determine morphology, FTIR to test functional groups, Cyclic Voltammetry and Galvanotic Charge-Discharge to test electrochemical properties. The asymmetric coin cell with 15% NiO mass in Ni(OH)2@NiO/ Graphene//Activated Carbon composite has the optimum power density and energy density of 327.4 W/kg and 17.1 Wh/kg.
Fidelity in quantum teleportation of 2 qubits with decoherent channel
Authors: Darmawan Yoga A , Prabowo Ananto A 
Published: April 2024

Abstract
This study discusses the one-way quantum teleportation of 2 qubits through a 4-qubit Bell state channel that is subject to decoherence. Decoherence is one of the unavoidable effects of noise in the transmission process. In the case of quantum teleportation, noise has an impact on the channel, causing changes in its state due to noise. In the absence of noise, teleportation occurs in an ideal state, resulting in a fidelity value of 1, signifying successful information transfer in the ideal scenario. However, when examined in the presence of noise, fidelity is not equal to 1 due to the influence of noise factors and the coefficient of the transmitted state. These noise factors indicate the strength of the noise. The stronger the noise, the lower the fidelity becomes.
Enhanced Superabsorbency of Cellulose-Based Hydrogels in NaOH Solution: Synthesis, Characterization, and Performance Evaluation
Authors: Nafisah Nur’aini , Rodhiyah Marathur , Luthfianti Halida Rahmi , Waresindo William Xaveriano , Arrosyid Bagas Haqi , Noviyanto Alfian , Hapidin Dian Ahmad , Edikresnha Dhewa , Khairurrijal Khairurrijal 
Published: April 2024

Abstract
Cellulose is a natural polymer that is abundantly available in nature. This study successfully developed cellulose dissolved in NaOH and formed into hydrogels using the freeze-thaw method. NaOH solution concentration as a cellulose solvent varied from 1% (CN1) to 5% (CN5) by weight. Six cycles of freezing and thawing were performed for 20 hours at -23°C and 4 hours at 37°C. Subsequently, morphological analysis, swelling degree, weight loss, and compression testing were conducted to assess the physical properties of cellulose-based hydrogels. The results demonstrate that as the concentration of NaOH increases, the resulting hydrogel exhibits smaller pore sizes, as evidenced by optical microscope images. Additionally, the swelling degree increased with the increasing NaOH fraction. The swelling tests were performed in both distilled water and PBS solutions. Notably, soaking the hydrogels in PBS solution demonstrated their potential as superabsorbent hydrogels (SAH). Furthermore, increased NaOH fraction was associated with higher weight loss, greater Young’s modulus, and reduced compressive strength.
Microstructures and Dielectric Permittivity Properties of Fe3O4/Cdots Nanocomposites Synthesized by Green Route Utilizing Moringa Oleifera Extract and Watermelon Peel
Authors: Latifa M F , Jiananda A , Riyanto A , Sari E K , Sitorus F S , Istiqomah N I , Suharyadi E 
Published: April 2024

Abstract
Dielectric materials are beneficial for storing electrical energy due to their insulating and polarization properties in response to external electric fields. Magnetite has shown promise as a dielectric material among other materials due to its good magnetic properties, low toxicity, and biocompatibility. However, the weakness of Fe3O4, which has low stability and easy agglomeration, requires a modification on its surface by using Carbon dots (Cdots). This research investigates the dielectric properties of Fe3O4/Cdots obtained through the green synthesis method. Fe3O4 nanoparticles were synthesized using the co-precipitation method with Moringa oleifera leaf extract as a reducing and stabilizing agent. In contrast, Cdots were synthesized using the hydrothermal method with watermelon peel waste as a carbon source. The Fe3O4 composite nanoparticles were characterized using X-ray diffraction (XRD), scanning electron microscopy-energy dispersive X-ray (SEM-EDX), ultraviolet-visible spectroscopy (UV-Vis), and impedance spectroscopy. The XRD spectra revealed the existence of cubic inverse spinel and a reduction in crystal size as the concentration of Cdots increased, measuring 7.8 and 7.1 nm, respectively. SEM-EDX revealed that the sample is composed of Fe, O, and C elements and has a spherical shape with Cdots distributed on the surface of Fe3O4. The UV-Vis spectrum showed the absorption peak of Cdots at 282 nm. The Fe3O4 absorption peak is identical to the Fe3O4/Cdots absorption peak at 193 nm. The increase in band gap energy from 2.96 to 3.33 eV is related to the increase in Cdots concentration. In the 10-900 kHz frequency range, dielectric property tests demonstrated peak dielectric permittivity values (real and imaginary). A substantial decrease was observed between 10 kHz and 200 kHz, followed by a relatively stable pattern up to 900 kHz. The loss tangent value obtained has a tanδ value <0.5, which means that the addition of Cdots affects reducing the energy loss stored in Fe3O4.
Formation of Fe4+ based on the Fe-O bond lengths in perovskite Eu1-xSrxFeO3
Authors: Rahman Raihan Mohammad , Akbar Mochammad Yan Pandu , Qori‘ Mohammad Dani Al , Nugroho Agustinus Agung 
Published: April 2024

Abstract
The physical properties of high oxidation state of transition metal oxide compounds have attracted many research interest for its potential applications. A systematic investigation of Fe4+ in Eu1-xSrxFeO3 with x = 0, 0.1, 0.2, 0.3, and 0.4 has been carried out in polycrystalline form obtained using sol-gel method. The single phase of Eu1-xSrxFeO3 is observed up to x = 0.3. The X-Ray powder pattern for low Sr content of x = 0.1, is best refined by using EuFeO3 crystal structure with Sr occupied the Eu-site. On the other hand, for higher Sr contents, two phases of EuFeO3 and Eu1/3Sr2/3FeO3 are required to obtained the best refinement. The result of the refinements shows that the volume and the average bond lengths of Fe-O decreases as increasing the Sr content. These results are consistent to support the existence of Fe4+ upon Sr doping in Eu1-xSrxFeO3. For the Sr content of x = 0.1, an anomalous change of the volume is observed.
Effect of Different Temperature and Nuclear Data Libraries in Criticality Calculations of 300 MWt Molten Salt Reactor
Authors: Variastuti Marisa , Irwanto Dwi 
Published: April 2024

Abstract
The Molten Salt Reactor (MSR) is a type of reactor in which coolant and fuel are blended with liquid salts. Liquid fuel enhances heat transfer and temperature control, establishing the MSR as one of the Generation IV reactor types. This study aims to analyze the impact of temperature variations on MSR reactor criticality and evaluate the effect of different nuclear data libraries, namely JENDL 3.2, JENDL 3.3, and JENDL 4.0, in neutron analysis. The observed temperature variations are 600 K, 700 K, 833 K, 903 K, and 1000 K. The analysis spans low to operational temperatures to comprehend reactor performance under differing thermal conditions. The study is conducted on a 300 MWTh MSR design, utilizing SRAC2006 with PIJ and CITATION modules for calculations. The results reveal the impact of temperature variations and nuclear data library disparities on reactor criticality. The outcomes demonstrate that higher temperatures correspond to lower values of the effective multiplication factor. At lower temperatures, neutrons experience greater moderation compared to higher temperatures. As a result, a higher number of thermal neutrons influences an increased probability of fission reactions within the reactor. Different nuclear data libraries also yield varied criticality values due to differing cross-sectional areas and quantities of data within each JENDL library. JENDL 4.0 generates the highest criticality value, attributed to elevated cross-sectional regions of each respective nuclear data entry and a greater quantity of nuclear data entries than JENDL 3.2 and JENDL 3.3.
Neutronic and Proliferation Resistance Analysis of Small Modular Pressurized Water Reactor with Various Fuel Types using SRAC 2006
Authors: Amatullah Amila , Permana Sidik , Pramuditya Syeilendra 
Published: April 2024

Abstract
One strategy for emission reduction in Indonesia is the dedieselization program, replacing diesel power plants with renewables. Pressurized Water Reactor (PWR) type Small Modular Reactor (SMR) is also a consideration. This study aims to compare fuel performance in SMRs. Four fuel types with varying fissile and fertile nuclides but equal fissile mass percentages were assessed: U235- U238, U235-Th232, U233-U238, and U233-Th232, using PIJ SRAC 2006 and JENDL 4.0. Parameters include neutron multiplication factor, conversion ratio, and isotope production. Results indicated that U233-U238 has a highest initial neutron multiplication factor, 1.55. Substituting uranium-238 with thorium-232 boosts neutron flux and conversion, reducing nuclear proliferation risk. While initial neutron multiplication may not be highest, thorium-232 can produce uranium-233 with high initial neutron multiplication factor. This research aids fuel selection for Indonesia SMR dedieselization program.
Evaluated Material Attractiveness of Plutonium Composition from Economic Simplified Boiling Water Reactor (ESBWR)
Authors: Nasyidiah Fungky Iqlima , Permana Sidik , Pramuditya Syeilendra 
Published: April 2024

Abstract
The potential for misuse of nuclear fuel has prompted many to make efforts to prevent a country from acquiring nuclear explosive devices (weapons). Weapon utility equated with nuclear material attractiveness when applied to protection and security. Material attractiveness evaluated using an equation first developed by Masaki Saito, namely ATTR. ESBWR is one of the reactors of the BWR reactor type that is still operating. The purpose of this study is to evaluate Material Attractiveness based on the composition of plutonium in the ESBWR reactor, during reactor operation and after reactor operation. The ATTR concept utilizes the plutonium isotope composition to evaluate the material attractiveness aspect. Parameters such as BCM, Rossi-alpha, and neutron prompt life become additional aspects in evaluating material attractiveness. In the research results, the ATTR value decreased from the beginning of reactor operation until the reactor stopped operating. At the beginning of the reactor operation, it was categorizing as a weapon-grade with an ATTR value of 0.19 and when the reactor stopped operating it was categorizing as an unusable grade with an ATTR value of 0.012. At the time of cooling time up to 1x106 (one million) cooling time, the ATTR value increases by 0.019 which was categorizing as an unusable grade. After a cooling time of 1x106 (one million) years up to 1x107 (ten million) years, the ATTR value was 0.001 which categorized as an exempt level. This states that the increasing burnup value will further reduce the ATTR value. Likewise with the Rossi-Alpha and Bare Critical Mass values. Conversely, it will decrease the value of neutron lifetime. The ATTR value after the reactor operates up to one hundred years of cooling time increases and then decreases significantly after 1x106 (one million) years due to the half-life of plutonium isotopes. Likewise, the Rossi-Alpha and Bare critical mass values. However, it is different with the neutron fast lifetime.