bluuebunny/crossref_metadata_2025 huggingface dataset:
Alternative Off-Site Power Supply During Extended Station Blackout for Future Nuclear Power Plants in Indonesia
Authors: Hakim Arief Rahman , Saputro Rakhmat Eko
Published: October 2024

The study explores the diverse and flexible coping (FLEX) strategy on a conventional large nuclear power plant connected to an alternative off-site power. Indonesia is one of the countries with the highest natural hazards in the world, so the newly-built NPPs are susceptible to station blackout (SBO) accidents one of the highest contributors to the core damage frequency (CDF). The study proposes a dedicated, independent, and direct electrical connection between a pressurized water reactor to a nearby hydropower plant as the alternative off-site power supply during the extended SBO. The study shows that the proposed strategy successfully reduces the SBO frequency by 90%—a net 33% CDF reduction without a major modification to the existing PWR design.
Analysis of Biomass Co-firing Combustion Test using Corn Cobs at Punagaya CFPP as A Green Energy Alternative
Authors: Ardiansyah R R , Dian J , Rhamadhan F Z
Published: October 2024

Indonesia is determined to reduce fossil fuels by 2060 set a national renewable energy mix target of 23% by 2025 and be free of fossil fuels by 2060. One of the PLN’s (a national electrical company in Indonesia) efforts to increase carbon emissions reduction and strengthen local new renewable energy is co-firing biomass on CFPP. Indonesia, which is located in a tropical area, has a large potential for biomass resources. Corn cob, one of the biomass types, has a big potential to replace coal as fuel in CFPP especially in Jeneponto Region, South Sulawesi. By utilizing corn cobs as a fuel with a co-firing mechanism, it can generate green energy. The methodology for assessing the corn cob co-firing combustion test’s performance at Punagaya CFPP is presented in this paper. It is based on a multi-criteria assessment designed to examine the technical, financial, and environmental effects of operating parameters with a mixture composition of 95% coal and 5% corn cobs at 70 MW load for 10 hours. From the test results in terms of operational aspects, the parameters have changed but it still in the normal operating range; FEGT increased by 5.3°C, bed temperature increased by 8.9°C, air chamber pressure decreased by 0.05 kPa, and total airflow decreased by 4.5 T/h. From the financial aspect, it has benefited from a decrease in the value of Specific Fuel Consumption (SFC), which is 0.014 kg/kWh compared to 100% coal. From the environmental aspect, the overall results of emission parameters are still by environmental quality standards and have decreased for NOx and SO2 parameters.
Investigation of ash problems potential for a blend of high-sulfur coal and bamboo pellet biomass
Authors: Ghazidin H , Suyatno  , Ruhiyat A S , Kuswa F M , Winangun K , Putra H P , Karuana F , Prismantoko A , Adelia N , Prayoga M Z E , Hariana
Published: October 2024

Biomass bamboo can be utilized as co-firing fuel in power plants in order to provide more green energy. However, the characteristics of biomass bamboo with high potassium and chlorine that probably increase ash problem aspects need to be investigated before the implementation. This study aims to obtain an initial prediction of slagging, fouling, abrasion, and corrosion for bamboo pellets and high-sulfur coal blends using empirical indices. This study used seven slagging parameters, four fouling parameters, one abrasion parameter, and two corrosion parameters. The result shows that a composition of 10-30 wt.% bamboo pellets is more recommended than others. Despite the composition of 50 wt.% and above being predicted to reduce the slagging risk of high-sulfur coal, the composition of 40 wt.% and above is predicted to increase the fouling risk. At higher compositions, 80 wt.% and above are predicted to increase the corrosion risk. Further test using a drop tube furnace is necessary to obtain comprehensive results. Moreover, the calorific value aspect needs to be considered depending on the need of the power plant for the efficiency aspect.
Synthesis of bio-hydrocarbon fuel using Ni and Co based catalyst on Indonesia natural zeolite
Authors: Wijaya G H A , Ramadhita H , Dwiatmoko A A , Simanjuntak F S H
Published: October 2024

Through a deoxygenation reaction, fatty acid-containing biomass resources including palm fruit, palm kernels, and soybeans can be converted into green diesel (bio-hydrocarbon). In this study, low-cost Indonesia natural zeolite was utilized as catalyst support for nickel, cobalt and a nickel/cobalt mixture. All prepared catalysts were used as catalyst for bio-hydrocarbon production via deoxygenation of fatty acid. The catalytic activity of each catalyst in the production of bio-hydrocarbon from fatty acid was investigated. Selectivity of each catalyst to hydrocarbon products, heptadecane, heptadecene, octadecene, and octadecane was studied as well. The results showed all prepared mono- and bi-metallic catalyst exhibited high conversion of fatty acid, more than 90% with a different yield of biohydrocarbon.
Modification of activated carbon through chemical-physical activation method with KOH and 60Co gamma irradiation from banana leaf waste
Authors: Ariyanti Dhita , Siagian Augie Davin , Swantomo Deni , Permana Sidik
Published: October 2024

Until now waste is still a problem in many big cities in Indonesia. In addition, the amount of waste increases as the population increases. Banana leaf waste is no exception, which is included in other types of waste, which accounts for 6.33% of the total waste in Indonesia in 2022. Utilization of banana leaf waste as a raw material for activated carbon production can also be an alternative to reducing the amount of wasted banana leaf waste because they contain various kinds of organic compounds. Activated carbon is widely used as an adsorbent in various sectors, especially in the industrial sector. Production of activated carbon must go through an activation process to enlarge the surface pores either chemically or physically, or even both. This study aims to compare the results of activated carbon surface area and functional groups using the chemical-physical activation method from banana leaf biomass raw materials with KOH and gamma irradiation at various doses. The research method used is an experimental method consisting of 4 stages: dehydration, carbonization, activation, and characterization. The research was started by dehydrating the leaves and continued with the carbonization stage at 350°C for 30 minutes. Carbon was divided into four samples that consisted of 1 blank and 3 test materials that activated with 30% (w/v) KOH solution for 24 hours and gamma-irradiated with a dose of 10, 30, and 50 kGy. Results were characterized using FTIR and BET. The effect of gamma 60Co irradiation on the activated carbon material from banana leaf waste can increase the peak transmittance value of the activated carbon functional group due to the formation and reaction of free radicals on its surface. Increase in the surface area (from 6.504 to 24.04 m2/g) is also associated with an increase in the absorbed dose due to the formation of more free radicals. However, the surface area obtained is not as expected due to the possibility of pore blockage and excessive activation time, which causes the surface area of the material to be small.
The Concept of Educational Park for Introducing Micro Hydro Energy in Rural Communities (The Case Study of Lalumpe Village in Indonesia)
Authors: Rumbayan Meita , Sompie Sherwin R.U , Tangkuman Stenly , Abast Kristifania , Rumbayan Rilya
Published: October 2024

This progress report highlights research on micro hydro technology as a renewable energy solution for a remote rural community in North Sulawesi, Indonesia. Focused on Lalumpe village, situated along the remote coastal region of Minahasa, the study identifies the Tulaun river as a potential resource to develop an educational park for introducing micro hydro energy. With energy being crucial for quality living in urban and rural areas, this research employs a literature review, data collection, and reserve engineering method to assess the feasibility of an educational park as a showcase for micro hydro energy. This report serves as a reserve engineering for the concept of an educational park in Lalumpe village, providing recommendations based on information extracting, modelling, and a review. These insights contribute to scenario development and a guideline for successfully implementing micro hydro technology as an educational park, thus empowering rural communities with sustainable energy solutions.
Synthesis and Characterization of LaMnO3 Prepared by Hydrothermal Synthesis Method
Authors: Febrianti Y , Dewi N N E , Purwanto A , Dimyati A , Kurniawan B
Published: October 2024

LaMnO3 powders were prepared by hydrothermal synthesis method by varying citric acid to metal ions. The ratio of citric acid to metal ions is one of the parameters that have an affect on purity of LaMnO3 prepared by hydrothermal method. It is necessary to control the parameter to obtain the good quality of the final product of LaMnO3. LaMnO3 with variation molar ratio of citric acid to metal ion (CA/M) of 0, 1 and 4 were prepared. To determine the morphology, crystall structure, and phase composition, the powders were characterized by Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS) and X-Ray Diffraction (XRD) techniques. The obtained results revealed that the morphology of sample CA/M = 0 has rod-like shape, CA/M = 1 was in the formed of irregular fine particles that stuck together and formed agglomerates, while the spherical morphology with various diameters were formed in the sample CA/M = 4. The XRD analysis demonstrated that sample CA/M = 1 had a single phase while in sample CA/M = 0 and CA/M = 4 others phase were detected such as La (OH)3 and La2O3. There was a change in crystall structure of the LaMnO3 phase in each sample due to the presence of citric acid. The peaks position in sample CA/M = 0, 1, dan 4 exhibit orthorhombic, rhombohendral and cubic structure with space group of Pnma, R -3c and Pm-3m respectively.
Fabrication of dye-sensitized solar cells with natural dye pigments derived from mustard green (Brassica juncea L) and turmeric (Curcuma longa L)
Authors: Yuliasari F , Nuraini U , Aeni A R , Hidayat R
Published: October 2024

Natural dye molecules are good alternatives for the ruthenium-based sensitizer for use in dye-sensitized solar cell (DSSC) application. In this research, we have reported the potential application of natural pigment extracts as a dye-sensitizer in DSSC. Natural dyes were extracted using simple maceration technique from natural sources such as mustard green (Brassica juncea L) and turmeric (Curcuma longa L). UV-Vis and FT-IR characterization were employed to examined the optical characteristics and identify their functional groups of the dyes, respectively. The UV-Vis characterization of mustard green dye and turmeric dye show a wide absorption in visible region. The FT-IR spectrum of mustard green dye and turmeric dye show the presence the anchoring groups. The DSSC’s performance was studied using current-voltage (I-V) measurements and electrochemical impedance spectroscopy (EIS). It was observed that the DSSC with turmeric dye shows better photovoltaic performance than DSSC with mustard green dye correlated to its longer charge carrier lifetime.
Electronic Properties of Monolayer Graphene with Doping of Nitrogen Atom: A Density Functional Theory Study
Authors: Nenohai A J W T , Santana F M , Arifin R , Asih R , Darminto
Published: October 2024

As a material that has been widely researched, graphene is certainly interesting because it has many unique features. In its development, graphene is very promising as an optoelectronic material. However, in theory, graphene has obstacles in its development because its band gap position is zero. With various modifications in opening the band gap so that it does not have a value of zero. In the current research, structural modifications were carried out on graphene layers by doping with a number of Nitrogen atoms. The modeling was carried out using graphene with a supercell size of 4 x 4 x 1. Our calculations are based on Density Functional Theory using the PBE – GGA function for potential exchange correlation. The result is the Fermi level shifting and emergence of magnetic moment through doping with Nitrogen atoms. The results obtained certainly open up opportunities for the development of graphene.
Effect of The Amount of 3-(trimethoxysilyl) propyl methacrylate on Improving Surface’s Adhesive Properties of Zirconia
Authors: Triastuti Warlinda Eka , Sumarno  , Suprapto  , Airlangga Bramantyo
Published: October 2024

The objective of this research was silanize zirconium oxide (ZrO2) nanoparticles with 3-(trimethoxysilyl) propyl methacrylate (γ -MPS). Silanization is a surface treatment process of a material using silane compounds to improve the surface adhesive and compatibility of ZrO2 with other materials or coatings and to modify its surface. The surface modification of ZrO2 by 3-(trimethoxysilyl) propyl methacrylate as coupling agents under the influence of ultrasonic waves. The silanized ZrO2 was characterized Fourier Transform Infrared Spectroscopy (FTIR) and thermogravimetric analysis (TGA). The FTIR analysis indicated the interaction of the silane compound on the ZrO2 surface, showing characteristic peaks corresponding to Zr-OH, C-H stretching, carbonyl groups, and Zr-O-Si bonds, indicating successful grafting. The FTIR spectra for the ZrO2 nanoparticles, showing peaks at 1088 cm−1 showed the formation of Zr-O-Si covalent bonds. ZrO2 nanoparticles also exhibited a characteristic peak at 400 cm−1, indicating the deformation of Zr-O-Zr bonds. C=C, and C=O peaks are observed in the range of 1632-1714 cm−1. Thermogravimetric analysis (TGA) measures showed a higher weight loss of the silanized ZrO2 when higher amounts of silane were added.
Adsorption Capacity and Efficiency of Composite Thin Sheet Made of Chitosan-Activated Carbon on The Adsorption of Methylene Blue
Authors: Widayani  , Gusnia Yessi , Viridi Sparisoma , Wungu Triati Dewi K
Published: October 2024

Methylene blue (MB) is a waste dye produced by textile industries. One way to reduce MB in polluting the environment is using MB adsorbent materials, such as chitosan (CS)-based composites. This research aims to investigate the adsorption capacity and efficiency of chitosan-activated carbon composites (CS-AC), which are in the form of thin sheets, on MB adsorption. The composite was made by manually mixing the chitosan and activated carbon, and then the mixture was poured into a dish and dried at around 50 °C until a dry, thin sheet was formed. The composites were prepared with varying activated carbon mass concentrations (25%, 50%, 75%, and 100% of chitosan mass). The MB adsorption measurements were carried out using UV-Vis spectroscopy. Adsorption capacity and adsorption efficiency increase with increasing activated carbon content, and the composite containing activated carbon mass 100% of chitosan mass shows the highest values, namely 11.51 mg/g and 95.93%, respectively. Furthermore, the values of adsorption capacity and adsorption efficiency are also influenced by the initial MB concentration and mass of the adsorbent. The adsorption capacity increases with increasing initial MB concentration but decreases with increasing adsorbent mass. Adsorption efficiency increases with increasing initial MB concentration and adsorbent mass.
Assessing Turbulence Model Performance in OpenFOAM for Natural Convection Simulations
Authors: Mahmudah R S N , Widiatmono R , Darmawan D , Fikri M R H , Sidek D , Hidayah A S N
Published: October 2024

Natural convection processes are pivotal in various engineering applications, necessitating accurate and reliable computational fluid dynamics (CFD) models for their simulation. This study evaluates the efficacy of different turbulence models implemented in OpenFOAM for a natural convection scenario, aiming to identify the most suitable model for capturing complex thermal and fluid dynamic behaviors. We compared several turbulence models, including the k − ε, k − ω, and k − ω SST, using a benchmark thermal convection case. Our methodology involved setting up the simulations to reflect realistic thermal gradients and boundary conditions, followed by a rigorous analysis of temperature distribution, vertical velocity profiles, and computational efficiency. The results indicate that the k − ω SST achieved the lowest averaged root mean square error (RMSE) values for temperature (0.076) and vertical velocity (0.03) while also requiring the fewest convergence iterations (314) compared to k − ε (411) and k − ω (1474). These findings demonstrate that the k − ω SST model is a suitable compromise between accuracy and computational cost for engineering applications. This study underscores the importance of selecting an appropriate turbulence model in OpenFOAM to enhance the accuracy of natural convection simulations, which can significantly influence design and safety considerations in engineering systems.
Low noise signal processing for electrochemical biosensor using narrow bandwidth filter
Authors: Setiadi Rahmondia N , Umar Lazuardi , Arfianti Arfianti
Published: October 2024

Biosensor has an important role in several domains, including medical and environmental applications. The improvement of biosensor measurement system therefore offers a better measurement quality. The objective of this work is the development of the signal processing of electrochemical biosensor for advanced analysis and use. The noise of electrochemical sensor is considered rather higher than the other sensor due to many factors such as electrode area, solution velocity, and particle size in solution, which affect adsorption-desorption process. Moreover, the sensor signal processing also makes contribution to noise level. Therefore, it must be reduced and suppressed to obtain better measurement result. In this paper, a bandwidth optimisation method is proposed and used to improve measurement quality. The system is realized with a transimpedance circuit and low-pass and high-pass filter, so that it offers low noise characteristics. The developed proposed system has provided better improvement than the standard electrochemical biosensor system. The noise of the system can be suppressed to be lower up to 14.3% of the standard transimpedance circuit. This development is promising to give better biosensor measurement.
IoT System for Floating Raft Hydroponics: Nutrient Monitoring and Automation
Authors: Purwalaksana A Z , Wahyu S , Ndari W E W , Syah S A , Rismawati E , Kusumadjati A , Suharmanto P
Published: October 2024

The utilization of hydroponic cultivation in agriculture is increasing due to its high productivity even in limited spaces. However, in practice, monitoring and controlling nutrients in hydroponic systems often require intensive human supervision and intervention. This issue can be addressed through technological advancements, particularly with the adoption of microcontrollers, sensors, and the Internet of Things (IoT). Previous research has developed IoT-based monitoring and control systems for DFT hydroponics using the Blynk platform. This study aims to develop an IoT-based nutrient monitoring and automation system for floating raft hydroponics. Floating raft hydroponics was chosen for its simplicity, lower installation costs, and space optimization. The system developed in this study uses the HC-SR04 ultrasonic sensor with an average error of 1.229%, the DS18B20 water temperature sensor with an error of 0.415%, and the TDS sensor with an error of 2.055%. The sensor and actuator measurement data are presented via the Antares Web. This research has the potential to minimize the necessity for manual intervention in hydroponic systems, thereby enhancing both efficiency and consistency in nutrient delivery.
Machine Learning Application to Classify Asteroids Based on Orbital Parameters
Authors: Delina M , Adassuriya J , Azzahra S A , Hussaan A M , Trismidianto
Published: October 2024

A machine learning application was developed to detect Potentially Hazardous Asteroid and mitigate asteroid collision risk with the Earth by applying three classifiers: the K-Nearest Neighbors, Naïve Bayes, and Random Forest. The study determined the most effective classifier for developing an asteroid classification program based on orbital motion. The machine learning classifier was then evaluated by its precision, accuracy, F1-score, and recall in determining Potentially Hazardous Asteroids and non-Potentially Hazardous Asteroids. The result presented Random Forest as the most appropriate classifier with the highest accuracy score of 99.53%, followed by the Naive Bayes classifier with an accuracy score of 92.00%, and the KNN classifier with an accuracy score of 84.45%. The study provided information on the most accurate machine learning classifier with the impact parameters for asteroid classification in an early warning system. By improving an embedded real-time detection system for Potentially Hazardous Asteroids, the study contributes to more effective strategies for mitigating the risk of asteroid impacts and enhancing planetary defence.
Implementation of the MPPT Particle Swarm Optimization Algorithm on a Hybrid PV-TEG Solar Panel with a DC-DC Buck Converter
Authors: Indrasari W , Nuvus A R , Ariyanti S F , Setiadi R N
Published: October 2024

Solar panels necessitate power control to locate the optimal working point amidst quickly changing voltages and diverse weather circumstances. This enables the system to adapt and sustain optimal performance in real-time. In order to address this issue, the optimization methodology known as Maximum Power Point Tracking (MPPT) is employed using an algorithmic artificial intelligence (AI) method. Particle Swarm Optimization (PSO) is a swarm intelligence technique that has effectively tackled diverse optimization issues in intricate systems. The DC-DC Buck Converter, which incorporates Maximum Power Point Tracking (MPPT), serves as an interface between the load and the photovoltaic (PV) system to control the output voltage of the system. A comparison is made between the performance of the Maximum Power Point Tracking (MPPT) technique using the Particle Swarm Optimization (PSO) algorithm and the hill climbing (HC) algorithm developed through MATLAB/SIMULINK simulations. The findings indicate that the PSO algorithm exhibits superior performance in terms of tracking time, output power, and stability, with little fluctuations or noise, as compared to the HC method. The tracking time is 0.02 seconds and 2.52 seconds, respectively. The power at constant irradiation is 14.49 Watts and 14.43 Watts. The power at irradiation variation is 6.98 Watt and 6.96 Watt. The PSO algorithm achieved a remarkable accuracy of 99.76% in this investigation, surpassing that of HC. This enhancement makes the system more effective in acquiring maximum power values.
Utilizing Nata de Pina for Hydrogel Synthesis: Effects of Citric Acid on Hydrogel Characteristics
Authors: Vera Nanda E , Yusmaniar Y , Juniar R , Pratiwi Y
Published: October 2024

The increasing production of pineapples will produce waste that’s increasing anyway. To optimize the utilization of pineapple skin waste One solution is to use the pineapple skin waste To be used as the main material for making nata de pina. Nata de pina is fiber cellulose on the surface of pineapple medium from the results of Acetobacter xylinum bacterial metabolism. The resulting cellulose is then used as a basic material manufacture of natural polimer as hydrogel. The research stage consists of 3 stages, namely making Nata de Pina, the manufacture of hydrogels as well as the characterization of the resulting hydrogels. The method used in hydrogel synthesis is chemical crosslinking with citric acid as a crosslinking agent. Variable variations performed in This study is the use of citric acid concentrations of 35%,37,5%,40%, and 42.5%. Nata de Pina-based hydrogel was successfully synthesized. Hydrogels based on Nata de Pina were successfully synthesized. It is shown based on the results of the FTIR test that the hydrogel has a C=O group that proving that there has been a cross-linking between cellulose and citric acid. The resulting hydrogel has good antibacterial activity against bacteria-positive and negative grams. The best results are shown by hydrogels with 40% concentration where the hydrogel has a maximum tensile strength value by 11.4 MPa. This study aim the innovative use of Nata de Pina, a byproduct of pineapple peel waste, as a novel material for hydrogel synthesis. By employing citric acid as a crosslinking agent, we investigated the effects on the hydrogel’s mechanical and swelling properties. Our findings demonstrate the potential of Nata de Pina-based hydrogels in sustainable material applications, offering an eco-friendly alternative to synthetic polymers.
Susceptibility and Metallics Elements in Soil Struck by Lightning in West Kotawaringin Regency, Central Kalimantan
Authors: Putri M Y , Sudarningsih S , Fahruddin F , Ibrahim I , Rifai H , Hamdan A M
Published: October 2024

Magnetic susceptibility is a magnetic parameter that assesses a magnetic material’s susceptibility to external magnetic fields. Magnetic susceptibility values can determine the properties of magnetic minerals related to the elements they contain. This research aims to determine the value of magnetic susceptibility and metal element content in soil struck by lightning in West Kotawaringin Regency. Sample measurements were performed using the Bartington MS2B instrument to determine the magnetic susceptibility value and XRF (X-ray fluorescence) to determine the metal element content in the soil samples. The magnetic susceptibility value obtained for sample A with low frequency (<10 strikes per month) was 26.1 x 10−8
m
3/kg; for sample B with medium frequency (11–200 strikes per month), it was 538.4 x 10−8
m
3/kg; and for sample C with high frequency (>20 strikes per month), it was 24.4 x 10−8
m
3/kg. Fe (388,000 mg/kg) was the most prevalent metal element in samples B and C, while element V (300 mg/kg) was the least prevalent in sample A. The sample with the highest metal element content was Fe (388,0 mg/kg), while sample A had the lowest metal element content, V (300 mg/kg). The highest correlation value between magnetic susceptibility and metals is 0.9 (K); 0.96 (Cr); 0.98 (Fe); and 1.00 (Ca, Ni, Zn, and Re).
Quantum error correction using multiple nitrogen-vacancy center qubits
Authors: Quraishi Hammad. A. , Majidi Muhammad. A.
Published: October 2024

Quantum error correction (QEC) is crucial for protecting quantum information from the decoherence caused by the interaction between the system and the environment. Many QEC techniques and algorithms have been proposed and demonstrated in various physical platforms at low temperatures, such as superconducting circuits, Rydberg’s atoms, and trapped ions. At room temperature, the QEC realization with nitrogen-vacancy (NV) centers in diamond has become very attractive due to the promising nature of the centers that have a relatively long spin coherence time and can be initialized and read out optically. Here, we investigate the potential realization of a simple repetitive three-qubit QEC scheme in which three NVs are coupled via dipolar coupling. A single NV qubit has been protected using two other coupled NVs which act as ancilla qubits. In this configuration of three NVs, a single NV qubit is protected from bit or phase-flip errors. This work paves the way for realizing five-qubit QEC with NVs at room temperature to preserve a qubit against any arbitrary single-qubit error.
Tolman VII (TVII) Solution with Theory of Energy-Momentum Squared Gravity (EMSG) in Neutron Stars
Authors: Selamat F J , Sulaksono A
Published: October 2024

We study the Tolman VII (TVII) solution for the Energy-Momentum Squared Gravity (EMSG) as well as the solution’s compatibility with stars properties. We perform a systematic analysis of the suitability of the equation of state (EoS) for energy density and pressure profiles. In calculations, for convenience, all physical quantities are expressed in the form of dimensionless quantities by introducing the quantity ζ = r/R. This dimensionless quantity will be used to determine the ratio between a star’s mass and its radius. The TVII solution provides limits on compactness C ∈ [0.01, 0.27] and neutron star’s mass 2.60M
⊙. Having α as a free parameter of the EMSG model gives the new range compactness C ∈ [0.01, 0.386] for ζ[0, 1] with α ∈ [0.01, ∞] and shows a star mass of 2.97M⊙. The metric eλ
effective and the metric eν
effective produce the range of α ∈ [0.1, 0.6], which represents both metric to be physical.
The Effect of Technical Operational Parameter on the Performance Stability of RF-Power Transfer for Cyclotron DECY-13 in Yogyakarta
Authors: Atmono T , Suntoro A , Dwiatmaja A , Piero M R D , Fajarudin R , Permana F S , Putra A E
Published: October 2024

Radio Frequency (RF) power transfer needs special condition in order to achieve high transmission coefficient, the matching condition between source and load must be met. In this case there are 3 important technical operation parameters, namely conductivity of cooling water, vacuum pressure, and magnetic field. They have influence on the impedance of the RF-generator load. An RF-generator of the frequency of 77.76 MHz having power up to 10 kW has been used in the construction of self-built cyclotron DECY-13 by BRIN in Yogyakarta. The experiment showed the increasing of power reflectivity up to 61% by rising of water conductivity 16%, i.e. 0.97 µS/cm, that used for cooling of the entire system inside the cyclotron chamber. The results also showed that the homogeneity of magnetic field from 1,5 to 2,0 ppm has changed the detected of impedance to be ~10 Ω at its real part and ~5 Ω at its imaginary part, by using network analyser based on Schmidt Chart analysis. On the other hand, the effect of vacuum pressure starting at 10−3 mbar to high vacuum have no significant effect on its real and imaginary parts of impedance.
Symmetric Cyclic Quantum Teleportation using Channel Parameter Matrix
Authors: Prabowo Ananto A , Purwanto Agus
Published: October 2024

The Channel Parameter Matrix (CPM) is a matrix containing general variables used to formulate the channel used for transmitting quantum bit (qubit) in quantum teleportation. CPM is an important parameter to describe the whole process in quantum teleportation. The scheme used in this process is symmetric cyclic. In cyclic scheme, there is three parties: Alice, Bob, and Charlie. For symmetric cyclic scheme, Alice sends one qubit to Bob, Bob sends one qubit to Charlie, Charlie sends one qubit to Alice. Then the size of CPM for symmetric is 8 x 8. Further derivation show that CPM depend on normalization constant, unitary matrix, and type of measurement.
Fostering prospective teacher-students to contextualize blackbody radiation in astrophysics
Authors: Sarah Lia Laela , Utama Judhistira Aria , Suhandi Andi
Published: October 2024

In astrophysical concepts, a star can be treated as a blackbody. However, teaching blackbody radiation in physics classrooms is not often relevant to astrophysical contexts. Therefore, prospective teacher-students need to have experiences contextualizing blackbody radiation in astrophysics. This study aimed to investigate how the inquiry lesson activities for teaching blackbody radiation in an astrophysics context, including the design of a simple experimental setup and the worksheets. The experimental setup was designed using affordable equipment like a tungsten bulb, a basic meter, a small piece of compact disk, and a smartphone application called lux meter. By manipulating the voltage across the tungsten filament and measuring the current and intensity using a lux meter, students can calculate its temperature, analyze the spectrum through PHET simulation, and construct a graph of wavelength vs intensity. The method of this study combines a qualitative analysis to describe the resulted spectral by the apparatus, lesson design, and description of the implementation. In addition, quantitative analysis using a quasi-experimental one-group pre-test and post-test design was conducted with prospective teacher-student participants who had taken the astronomy course and are still taking the modern physics course. The results show that inquiry lesson using simple apparatus model and materials positively fosters prospective teacher-students understanding of how to contextualize the blackbody radiation concept in astrophysics.
The Implementation of Case Based Learning in Physics Learning at The Collage: A Systematic Literature Review
Authors: Astuti I A D , Wibawa B , Japar M
Published: October 2024

Physics learning at the college level using the Case-Based Learning approach offers an interactive method through the analysis of real cases or situations relevant by integrating theory with practical applications and enhancing a deep understanding of concepts. The objective of this research is to analyze literature studies on Case-Based Learning in physics education at the university level. This study employs the Systematic Literature Review (SLR) method. Data collection was carried out by documenting and reviewing related articles published between 2014-2024. Based on the search results, a total of 80 relevant articles were obtained, which were then filtered based on inclusion criteria to yield 10 articles used as primary studies. Each article was coded, and then analyzed based on the skills developed from the research findings. The results of the systematic literature review indicate that Case-Based Learning in physics education effectively enhances students’ analytical and problem-solving skills. This approach facilitates the integration of theory and practical applications through real-life case studies, enabling students to develop their critical and analytical thinking skills.
Exploring Students’ Openness Traits for Achieving Meaningful Learning in Modern Physics Concepts
Authors: Susanti Dwi , Maulana Slamet , Aroyandini Elvara Norma
Published: October 2024

This study aims to explore the openness traits possessed by students in realizing meaningful learning in modern physics learning. This study analyses how the openness traits possessed by learners contribute to mastery of modern physics concepts and relate them to classical physics concepts. Through quasi-experimental research methods, this study will analyze the correlation of openness traits possessed by students to the achievement of meaningful learning in modern physics concepts. This study found several findings in the form of a significant correlation between the openness traits possessed by students and the achievement of meaningful learning in the concepts of modern physical physics. Learners with higher openness tend to demonstrate a deeper understanding of complex concepts, engage more actively in critical thinking and problem-solving, and express tremendous enthusiasm for exploring advanced topics in modern physics. These students also often show a high willingness to collaborate and explore further related modern physics concepts to the relationship between classical and quantum physics. Based on the results of this research, it can be concluded that fostering and cultivating openness traits among learners has a high impact on achieving learning, especially in modern physics concepts that demand a high level of conceptual understanding and analytical skills. Educators and institutions can leverage these findings to design more inclusive and engaging learning environments that encourage and support the development of openness traits among learners, ultimately improving their overall academic success and proficiency in modern physics concepts.
Web-based Inquiry Physics Problems (WIPPer) for Enhancing Physics Learning in Blended Environments
Authors: Herliana F , Mardila R , Mahzum E , Muliyati D , Susilawati S , Saputri M , Musdar M , Elisa E
Published: October 2024

Incorporating digital technologies is essential in blended learning contexts to enhance conventional instructional approaches. This study aims to develop a Web-based Inquiry Physics Problem (WIPPer) as an interactive learning medium in a blended environment for the physics learning process. This study employs research and development approaches, applying the ADDIE approach to the development stage. The initial research step analyzes the physics learning demands of the web using literature and field investigations. The last phase of the development process involves producing a WIPPer product prepared for evaluation by materials, media, and instructional design experts, together with two high school physics teachers who will act as practitioners. Expert and practitioner assessments employ tools that evaluate material, media, and learning design. Expert and practitioner evaluation data were analyzed using the Aiken V algorithm. WIPPer had an Aiken V score of 0.867 from material and learning design experts and 0.805 from experts in media, indicating that experts deemed it highly valid. The results emphasize the potential of WIPPer as a beneficial tool for instructors who want to enhance physics training in blended learning contexts. It promotes more profound knowledge and active engagement among students.
India’s pathway to net zero by 2070: status, challenges, and way forward
Authors: Chaturvedi Vaibhav , Ghosh Arunabha , Garg Amit , Avashia Vidhee , Vishwanathan Saritha Sudharmma , Gupta Dipti , Sinha Nilesh Kumar , Bhushan Chandra , Banerjee Srestha , Datt Divya , Bansal Juhi , Pathak Minal , Dhar Subash , Singh Ajeet Kumar , Khan Nayeem , Rashmi Rajani Ranjan , Agrawal Shalu , Agarwal Disha , Singh Anjali , N C Thirumalai , Saxena Siddharth S , Vishal Vikram , Singh Udayan , Mallapragada Dharik S , Chaturvedi Rajiv Kumar , Pillai Aditya Valiathan , Garg Vibhuti , Singh Santosh , Hari Kavya , Janardhanan Nandakumar , Zusman Eric , Mahapatra Diptiranjan , Raha Shuva , Gupta Tulika , Prasad Sumit
Published: October 2024

The announcement of India’s 2070 net-zero target has demonstrated the power of a credible policy signal and changed the course of India’s climate debate. While the Government of India (GoI) has not specified whether this target refers to carbon-dioxide or all greenhouse gases, the announcement has been a watershed moment in India’s climate policy. From questions related to whether and at what pace should India decarbonize its economy, various actors in India are now aligned towards this target. An important contribution to inform India’s net-zero journey has come through various modelling assessments undertaken by India’s institutions and researchers. While a few economy-wide net-zero modelling assessments are available, a comprehensive and integrated picture woven collaboratively by India’s climate experts is conspicuously missing. It is critical to complement quantitative modelling-based assessments with insightful perspectives of experts on India’s climate policy. Together, modelling based quantitative assessments and insightful qualitative perspectives of climate experts would be an instrumental force that will ensure that the country achieves its net-zero target by understanding synergies and trade-offs, harnessing opportunities, and avoiding risks along the way. This collaborative article discusses various aspects of pathways towards India’s net-zero goal to address the gap in literature by looking at broad and inter-related dimensions of ‘national and sub-national perspectives’, ‘sectoral and technological transitions’, and ‘enablers’ needed for India’s transition. While the larger net-zero debate relates to all greenhouse gases, we focus on carbon dioxide in our current effort. The assessment aims to inform not just India’s policy makers and stakeholders, but various researchers, practitioners and governments around the world for them to be better aware of the various aspects of India’s net-zero debate. It weaves the perspectives of experts from 24 institutions across the three broad dimensions to give a comprehensive view of a roadmap towards India’s net-zero future.
Design of a compact beam transport system for laser-driven proton therapy
Authors: LI 李 Yangfan 扬帆 , SHEN 沈 Xiaofei 晓飞 , YAO 姚 Yilin 屹林 , QIAO 乔 Bin 宾
Published: October 2024

We put forward a new design of a compact beam transport system for intense laser-driven proton therapy, where instead of using conventional pulsed solenoids, our design relies on a helical coil irradiated by a nanosecond laser pulse to generate strong magnetic fields for focusing protons. A pair of dipole magnets and apertures are employed to further filter protons with large divergences and low energies. Our numerical studies combine particle-in-cell simulations for laser-plasma interaction to generate high-energy monoenergetic proton beams, finite element analysis for evaluating the magnetic field distribution inside the coil, and Monte-Carlo simulations for beam transport and energy deposition. Our results show that with this design, a spread-out Bragg peak in a range of several centimeters to a deep-seated tumor with a dose of approximately 16.5 cGy and fluctuation around 2% can be achieved. The instantaneous dose rate reaches up to 109 Gy/s, holding the potential for future FLASH radiotherapy research.
Mindfully Rocking and Rolling
Authors: Davida Dena
Published: October 2024

This auto-ethnographic memoir of a North American dancer’s immersion into the postmodern artworld of Contact Improvisation (CI) in the 1970s and 1980s seeks to balance past and present perspectives of how and why we danced then. Now in her seventies, she brings to consciousness past sensations and beliefs by way of an archive of notes, posters, interviews, reviews, and photos and through the lens of second wave feminism. This chapter recreates events of that period in Minnesota in which the practice and pedagogy of Contact Improvisation was in its formative years, and how after immigrating to Canada, she introduced initial classes and jams to Montrealers, taught CI in the Dance Department at the University of Québec, formed the Catpoto Dance Collective, and created the gender role-reversing performance Each Man for Herself. Instigated by challenging and illuminating lived experiences during the CI @ 50 gathering at Oberlin College in March 2022, the author interweaves the original narrative of her all-consuming passion for CI as a young “artivist” dancer with powerful and necessary critiques reframing and changing the nature and meaning of its practice today.
Doing It Wrong
Authors: Bigé Emma , Singh Paul
Published: October 2024

Taken to task and inspired by the generative intervention of Ishmael Houston-Jones and Fred Holland’s Wrong Contact Manifesto, this conversation investigates the (lost/erased/fugitive) legacies of the aesthetics of the Black radical tradition in Contact Improvisation’s history. From the contemporary cultural currency of racial optics and their effect on some Contact Improvisation communities, to deeper historical strata going back to the invention of jazz and to Fred Moten’s philosophy of blackness and improvisation, this conversation asks: What kind of gestures are made possible, and what kind of gestures are hindered when the haptics of race come to the foreground?
Therapeutic Applications of Contact Improvisation
Authors: (Brando) Aaron Brandes , Revlock Gabrielle
Published: October 2024

In this chapter, the authors articulate how elements of Contact Improvisation can be adapted for a broader audience who may have limited access to the kind of interpersonal contact that humans need to thrive. Research on the therapeutic benefits of touch is interwoven with the authors’ personal and professional experiences: Brandes is a licensed psychotherapist who infuses body-based modalities and somatic education into his Body&Being sessions; Revlock is a professional dancer, educator, and the creator of Restorative Contact, a partner mindfulness practice. Their holistic perspective bridges the gap between the body and mind, offering a connection between individuals and the transformative potential of touch. Specific aspects of Contact Improvisation that are explored in the chapter include compression, reciprocal touch, bonding with the earth, spherical space, attunement, and weight-sharing.
Rolling and Knowing
Authors: Schultis Brian
Published: October 2024

This chapter explores how Contact Improvisation and other embodied ephemeral forms endure through time. It foregrounds the physical action of rolling as it is often done in Contact Improvisation as an act of knowing, in contrast to a conventional static image of knowledge described by Tim Ingold as a logic of inversion. It develops this form of knowing in two ways, both drawing on the thinking of Gilles Deleuze and Félix Guattari. First it shows how rolling establishes a dynamic intensive system and then how it works between smooth and striated space. Throughout, the concepts are illustrated with examples from the author’s reflections on a year of intensive dancing.
The Religious Function of Contact Improvisation
Authors: Laursen Carol
Published: October 2024

While Contact Improvisation developed within a secular framework, its practice can give rise to profound religious insight. This chapter examines some of the ways that the process of experiencing CI facilitates a dancer’s capacity to perceive a connection with a larger mystery. It also explores parallels with explicitly religious traditions such as Aikido, Quakerism, and Zen Buddhism. These forms have the intention to transform their practitioners in fundamental ways which are beneficial to themselves and the wider world. Some of the potential pitfalls that can inhibit this transformation are held up in an attempt to modify how one understands religious practice, allowing it to include both the visceral body and metaphoric spirit.
Making Contact
Authors: Suraj Guru , Michalska Adrianna
Published: October 2024

This chapter provides an overview of the practice of Contact Improvisation (CI) in India. Starting from tracing the introduction of the form by international teachers, it follows the emergence of local facilitators and their adaptation of the CI practice to the context of India, in order to discuss the potential of the form to challenge established norms of social interactions. The chapter briefly addresses aspects of living in India, including casteism, colonial influence on regulating the power dynamics related to gender, and social and economic status. Based on this, the chapter outlines the process of developing a community of independent Indian facilitators and touches on the issues of colonialism in the arts and power dynamics between international and Indian teachers. The chapter then discusses in more detail the adaptation of teaching and organizing of CI events according to the constraints of social norms in India. Through practical examples, the chapter describes the principles around which the teaching of CI is centered—emphasizing the autonomy, self-authority of an individual while fostering collaboration and collective attention of a group. It concludes with a reflection on the practice of CI as providing a more expansive understanding of human experience and therefore becoming a potentially revolutionary practice of inclusion and diversity that can challenge and expand the structures of the society.