bluuebunny/crossref_metadata_2025_split huggingface dataset:
Nozzle diameter and expansion ratio of compressed air foam system
Authors: Farida F M , Kusumohadi C S , Fikri M F 
Published: October 2023

Abstract
Variations of nozzles are studied for Compressed Air Foam Systems (CAFS). The CAFS is a self-contained fire suppression system with the capability of injecting compressed air into the foam solution to create a dense mist. Even though this type of foam has a tighter, denser bubble structure that allows it to adhere to vertical and horizontal surfaces and penetrate the fire more deeply before the bubbles burst, thereby making it more effective, the nozzle of CAFS is weak. The experimental study has been done in order to find the expansion ratio of the nozzle. Four sizes of diameter nozzles are 5 mm, 10 mm, and 20 mm, and three holes are 20 mm. Nozzle diameter size has a correlation with bubble size. The highest expansion ratio is found in the nozzle with three holes 20 mm in diameter. It is followed by a nozzle with a 20 mm diameter, then a 10 mm diameter. The last finding is a nozzle with five diameters. The other founding is the linear correlation between nozzle diameter size and bubble size. But it is on the other way than the correlation between nozzle diameter and bubble size. The shorter the nozzle diameter, the faster the fire extinguishing time.
Comparison of phenol formaldehyde with polyvinyl chloride resin as binder bonded NdFeB magnet for axial flux generator
Authors: Sudrajat N , Dedi D , Rusmana A 
Published: October 2023

Abstract
Bonded permanent magnets are made by mixing a magnetic powder material Neodymium Iron Boron (NdFeB) commercial MQP type 16-7 with a polymer material powders phenol formaldehyde (Bakelite) and polyvinyl chloride (PVC) resin. Comparison between the composition of NdFeB powder and the polymer powders were varied at 80:20, 90:10, and 95:5 wt%, respectively. This mixture is then pressed with a hot press system and then carried out magnetic alignment axial flux using a magnetizer machine, Magnet Phisyk-Germany, with an impulse system. Magnetic properties were characterized by permagraph Magnet Phisyk-Germany. The best value obtained for the composition of 95: 5% NdFeB-pvc resin powder to the value of remanence magnet (Br) = 0.604 Tesla (T), the value of coercivity (Hc) = 480 kA/m and maximum energy product (BH)max = 50.05 kJ/m3. Fabrication is done by the size of the magnetic 50 mm diameter, 8 mm thick and was applied to the axial flux generator. The output voltage of the generator has been tested with variations of 50 to 300 rotations per minute (rpm) using a Hantek 6022BE oscilloscope, and the measurement results obtained values of 1.9 to 12.2 Volts.
Simulation of temperature distribution in 3D printing heated chamber on orientation and temperature variations with ABS material
Authors: Kholil A , Syaefudin E A , Juniar A , Rohim M K , Dwiyati S T 
Published: October 2023

Abstract
Currently, the use of 3D printing is growing rapidly. Uneven temperature distribution in the printing chamber causes problems such as warpage, shrinkage, geometric accuracy, and decreased mechanical properties. The proper environmental temperature is needed to produce a good part. The heated chamber is needed to regulate the temperature during the printing process. Simulation of CFD is carried out, knowing the temperature distribution inside the heated chamber. Simulations and experiments were carried out with variations in temperature of 70 °C, 80 °C, 90 °C, and 100 °C with an airflow rate of 3 m/s. The correlation of temperature distribution in a chamber between simulation and experiment was investigated. Experiments on FDM 3D Printing with 70 × 30 × 30 mm3 ABS material dimensions. Meanwhile, variations in printing orientation on the x, y, and z-axes. The results show a fit correlation between simulation and experiment. The temperature in a heated chamber has increased and the temperature distribution is even during the printing process, along with increasing temperature variations from the heater. The heat flux distribution shows different temperature variations in each part build orientation. Therefore, the orientation and temperature rise of the chamber play a pivotal role in quality.
Nickel layers properties produced by electroplating were influenced by spinning permanent magnet
Authors: Syamsuir S , Susetyo F B , Soegijono B , Yudanto S D , Basori  , Nanto D 
Published: October 2023

Abstract
A spinning magnet is an alternative engineering approach to produce the Ni layer. In the present research, the Ni layer was plated on Cu alloy substrates influenced by a spinning magnet. Various rotating speeds (0, 500, and 800 rpm) were used to influence the Ni layer’s properties were formed. A digital scale was used to measure the deposition rate and cathodic current efficiency. XRD, SEM-EDS, potentiostat, and hardness tests were performed to determine the properties of the Ni layers. A rotating magnetic field can reduce the deposition rate and cathodic current efficiency by reducing the ionic movement from the anode to the cathode. The XRD and SEM results revealed a distinct crystallite size and surface morphology. Exhibiting a spinning could result in a decrease in oxygen in the Ni layer and a slight change in the corrosion rates. Different hardness is also seen in the various sample due to crystallite size.
Effect of temperature on the creep properties of polycrystalline Cu-Ni alloy: insight from molecular dynamics simulation
Authors: Ekardi M L , Zaenudin M , Saleh Y K P , Hidayat N C , Gamayel A , Mulyana F , Mohammed M N 
Published: October 2023

Abstract
Creep is a phenomenon where a particular material tends to deform due to highly subjected parameters, such as temperature and pressure. This deformation is promoted by the diffusion of the material across the grain boundary, as critically assessed by Coble in 1963. This phenomenon is primarily crucial since the most critical application of materials is subjected to high temperature and pressure. This study intends to assess the effect of temperature of polycrystalline Cu-Ni alloy by utilizing molecular dynamics simulation. The simulation is run with different temperatures, thus allowing studying the critical differences between the applied parameters. The results show that the temperature affects the creep rate at every creep stage, primary and secondary, by a significant value. This is due to the deformation promoted by the diffusion of atoms across the grain boundary, decreasing the crystallinity of polycrystalline Cu-Ni alloy. Although the effect of temperature on the creep mechanism of polycrystalline Cu-Ni alloy seems straightforward, it is necessary to assess whether it increases the creep rate at a low temperature in further detail.
Synthesis and microwave absorption properties of Ca-substituted barium hexaferrite nano-crystalline synthesized via ceramic and mechanical milling method
Authors: Handoko E , Aulia T B , Marpaung M A , Taufiq A , Iriani Y , Umaisaroh U , Alaydrus M 
Published: October 2023

Abstract
To broaden the scope of a novel microwave absorbing material inside the x-band frequency range (8.2–12.4 GHz), Ca-substituted barium hexaferrite nano-crystalline were successfully synthesized prepared via standard ceramic route and mechanical milling method. The sintered BaFe12O19 (x=0) and Ba0.9Ca0.1Fe12O19 (x=1) at 1100°C for three hours were obtained the formation of magnetic phase and hysteresis behaviour and indicative of ferromagnetism. The analysis of x-ray diffraction was resulted to investigate the composition and magnetic phase. The dependence of complex permeability on frequency (μ = μ′ – jμ″) and the permittivity (ε = ε′ – jε″) were obtained. The reflection loss, RL-values were calculated and resulted multi–broadband with a thickness of 9.7 mm. It proved that Ca-substituted barium hexaferrite nano-crystalline material has a great potential for microwave absorption and electromagnetic applications.
Implementation of active noise cancelling for sound isolation box
Authors: Putri C C , Hermawanto D , Prajitno P 
Published: October 2023

Abstract
A quiet room is essential for acoustical instrument calibration, such as the sound level meter. A small acoustic chamber can be utilized to create an environment that is free from noise. Commonly, it is built with a passive noise-blocking system using high-density absorber material such as rock wool or glass wool. However, this approach results in a room that is both heavy and costly. This paper proposes a mini acoustic chamber that utilizes an active noise cancelling (ANC) system to block the noise. A filtered-x least mean square (FxLMS) algorithm was implemented for the ANC system. A simulation of the system with the recorded actual noise data was conducted to find the optimum filter parameter. The results show that the ANC system could reduce the noise up to 2 dB for certain types of noises. The sound outside the chamber was recorded and processed offline to tune the filter parameter. Evaluation of the effectiveness of the proposed noise reduction system was performed by measuring the sound inside the chamber.
Prediction of organic molecular optical absorption energy based on deep learning using mordred descriptor features
Authors: Suhendar H , Windiyanti A , Asriani A 
Published: October 2023

Abstract
Organic molecules have several characteristics based on optical absorption. A molecule absorbs a specific light wavelength that represents electronic energy in the material. The absorption wavelength is also related to atomic binding of molecules that interact with material during light exposure producing electronic instability in the material. Molecular absorption can be measured using several optical spectrometer configurations that contain a light source, optical path, and light detector. The measurements of molecular optical absorption have been reported in several research and have been collected into a material database. In this paper, we developed a model for predicting organic molecular optical absorption using deep learning. The model can predict molecular absorption energy based on extracted features of molecular structure using Mordred descriptor features extraction. Our model used 1625 molecules of absorption in several solvent datasets that split into 80% training and 20% testing dataset. The result show that our model has a good agreement with experimental data with correlation coefficient 0.96 and mean average error 0.172 eV.
The Power-Normalized Cepstral Coefficient (PNCC) for convolutional neural networks-based robust speech command recognition
Authors: Iswanto B H , Hafizhahullah H , Pardede H F , Zahra A 
Published: October 2023

Abstract
While implementations of speech recognition grow rapidly in recent years and are slowly being integrated into our daily devices, the problem of noise robustness is still a challenging task, even with the recent advancement of deep learning technologies for speech recognition. The presence of noise may cause a mismatch between training, which is performed in clean conditions, and noisy testing conditions. This paper proposes a method to extract features for speech recognition by employing features derived under the power law scale, i.e., the Power-Normalized Cepstral Coefficient (PNCC). The power-law can provide better compression in low-energy regions so that it is not sensitive when the speech signal is distorted by noise. The features are implemented on speech recognition based on Convolutional Neural Networks (CNNs). The experiments were carried out by TensorFlow’s Speech Command Dataset mixed with various signal-to-noise ratio to evaluate the method. The experimental findings indicate that the accuracy ranges from 81% to 86%.
The effect of Coulomb repulsion on Seebeck coefficient of NiCl2 monolayer
Authors: Prayitno T B , Sarwono Y P , Budi E , Riyanto F A , Jaelani A 
Published: October 2023

Abstract
The Seebeck effect of NiCl2 has been explored by using first-principles calculations under the LDA+U to include the Coulomb repulsion. The exploration was conducted for two cases, namely, close to the critical temperature and room temperature. We found the slight difference of the peaks of Seebeck coefficients, i.e., the highest peak has been observed near the critical temperature. As the Coulomb repulsion was considered, the peak was shifted both two cases. It suggested that the Seebeck effect was influenced by the Coulomb repulsion.
Investigation on Seebeck coefficient of FeCl2 monolayer with LDA+U approach
Authors: Prayitno T B , Sarwono Y P , Abdillah M A , Kartika M C 
Published: October 2023

Abstract
Implementation of LDA+U approach has been employed to investigate the Seebeck effect of FeCl2 monolayer. The calculation was carried out by keeping the out of plane magnetism in the primitive cell. After obtaining the convergence calculation, we then used the semi classical Boltzmann transport to calculate the Seebeck coefficient. To see the effect of magnetism, we plotted two Seebeck coefficients near the critical temperature and room temperature. The peak of Seebeck coefficient near the critical temperature was higher than that at room temperature. This implies the magnetism may influence the Seebeck effect in thermoelectric material.
Development of mobile biosensor reader for wearable sweat glucose biosensor application
Authors: Busono P , Febryarto R , Ma’arif R A , Astawa I M , Yogiswara I P A , Karim S , Majid F A , Amrullah A , Rahayu S , Rahmah M 
Published: October 2023

Abstract
Sweat contains numerous biomarkers, including glucose, which can provide valuable insights into an individual’s metabolic state. Noninvasive glucose monitoring eliminates the need for frequent finger pricks or blood samples, offering greater convenience and reducing discomfort for individuals with diabetes. These biosensors are designed to detect and quantify glucose levels through various sensing mechanisms, such as enzymatic reactions or electrochemical measurements. The integration of biosensors into wearable devices, such as smartwatches, patches, or flexible electronics, allows for mobile glucose monitoring in sweat. Accurate glucose measurements require calibration and validation against reference measurements, such as blood glucose levels. Research focuses on developing calibration algorithms and improving the accuracy and reliability of mobile glucose biosensors in sweat.
Preliminary analysis of crustal anisotropy in the southernmost part of Simeulue Island
Authors: Syuhada S , Muttaqy F , Puspito N T , Pranata B , Anggono T , Ramdhan M , Mukti M M , Febriani F , Dewi C N , Prasetio A D , Hasib M , Aulia A N 
Published: October 2023

Abstract
The study location is in the southernmost region of Simeulue Island near the Indo-Australian subduction margin. The deformation and geodynamic evolution around the island have been studied through some geophysical and geological studies. However, information regarding crustal seismic anisotropy around this region is less investigated, which may be very useful in delineating the deformation process in this area. In this work, we conducted an initial crustal anisotropy study using shear wave splitting analysis for two seismic stations from two datasets. One seismic station is from temporary deployment data recording data between December 2005 and March 2006, and the other one is from IA permanent network data. The objective of using these two different datasets is to assess the splitting analysis’s consistency and constrain the dominant cause of crustal anisotropy around the study area. The anisotropy orientations at all seismic stations are parallel to the regional stress direction. This situation may imply that anisotropy around the study area is mainly due to stress-induced anisotropy. Furthermore, the delay time distribution with depth suggests that the anisotropic source is concentrated around 15-20 km depth of the crust. This indicates a strong influence from the interaction between the lower crust and the upper part of the subducting slab.
Analysis of vertical seismic deformation of the 2018 Palu earthquake using Global Navigation Satellite System (GNSS) data
Authors: Nurdin N , Pujiastuti D , Marzuki M 
Published: October 2023

Abstract
The vertical seismic deformation of the Palu earthquake magnitude of 7.4 on the Richter Scale, which occurred on September 28, 2018, has been analyzed using InaCORS (Indonesian Continuously Operating Reference Stations) stations. The stations used are CBAL, PALP, CTOL, CMLI, CPAL, and CBIT. The analysis was conducted using GAMIT, GLBOK, and GMT software. The analysis focused on the period of 100 days, starting from August 6, 2018 (DoY 218) to November 28, 2018 (DoY 318), encompassing the preseismic, coseismic, and post-seismic phases. During the preseismic phase (DoY 218-270), the InaCORS stations experienced a slight deformation ranging from -10.9353 mm to 6.5525 mm. Tectonic manifestations influenced the direction of movement in Sulawesi. The deformation significantly increased in the coseismic phase (DoY 271-272). The InaCORS stations experienced deformations ranging from -169.8 mm to 8.755 mm, which differed in the direction from the preseismic phase. The stations in the northern region predominantly moved towards the north, while those in the southern region moved towards the south. During the post-seismic phase (DoY 273-318), the movement of the InaCORS stations followed the direction of deformation observed in the coseismic phase. However, the displacement was relatively smaller, ranging from 11.5909 mm to 17.23733 mm.
Analysis of peak ground acceleration based on microtremor data in Rejang Lebong, Bengkulu
Authors: Siburian B I , Lubis A M , Marzuki M 
Published: October 2023

Abstract
Rejang Lebong is a regency in the province of Bengkulu, located in the Bukit Barisan mountainous region. The area is dominated by fault earthquakes due to its proximity to the Musi and Ketaun faults. This article presents the results of a study on earthquake hazard analysis through microtremor measurement using the HVSR method to determine the value of Peak Ground Acceleration (PGA). Measurements were taken at 10 points for 60 minutes with a 2 km interval. The HVSR method was used to obtain the dominant period value. The determination of PGA value was based on historical fault earthquakes in RejangLebong in 1943 with a magnitude of Mw 7.4. The largest PGA value obtained was 627.34 gal, which was in the western part of the study area. This is significantly correlated with the earthquake hazard in 1943, which caused the highest damage in the Tes village located in the western part of the study area. This research is useful for pre-disaster earthquake mitigation plans through risk management to reduce the impact of earthquake hazards.
Integration of Electrical Resistivity Tomography (ERT) and Induced Polarization (IP) methods to observe seawater intrusion in Sungai Nipah Village, Mempawah Regency
Authors: Muhardi M , Perdhana R , Kusuma I 
Published: October 2023

Abstract
Sungai Nipah Village is one of the coastal areas of Mempawah Regency, where most people utilize dug wells to meet their clean water needs. The problem faced by the community is that the clean water from the drilled well still has a brackish to salty taste. This study aims to observe seawater intrusion that is estimated to cause the problem based on the distribution of resistivity and chargeability values in the subsurface. The methods used are electrical resistivity tomography (ERT) and induced polarization (IP). The field measurements used a Wenner-Schlumberger configuration with three lines that have a length of 200 m each. The resulting research showed that the study area in Sungai Nipah village is prone to seawater intrusion. The seawater intruding the shallow unconfined aquifer is indicated by resistivity and chargeability values of less than 1 Ωm and 5 ms – 25 ms, respectively. The aquifer layer is composed of sand and clay at a depth of about 13 to 17 m. The seawater intrusion extended from the southern part of the study area to the north and covered about half of the study area.
The Fourth-Order KN potential Matrix-Element in 3D basis
Authors: Nugraha A , Fadhlurahman H , Fachruddin I , Salam A 
Published: October 2023

Abstract
The aim of this study is to derive the fourth-order KN potential matrix-element. The matrix element is derived in 3D basis. Previous study about the-second order KN interaction shows that the result need to be improved, so we continue the study to the fourth-order. Potential matrix-element is derived from KN Interaction potential which is developed by Büttgen (Nucl. Phys. A506) dan Müller (Nucl. Phys. A513). The meson being exchanged in the fourth-order KN interaction is pion with intermediate state are NK* and ΔK*. Potential matrix-element is formulated from potential on 3D basis. We apply 3D technique in this study as a good alternative to Partial wave technique. That technique does not expand the free state in partial wave so it is useful in high energy scattering. Potential matrix-element derived from this study can be used to calculate differential cross section which can be used to calculate the contribution of pion exchange in KN scattering.
Design of S-Band accelerator structure utilizing 2.45 GHz magnetron
Authors: Rezon K , Satmoko A , Kasmudin K 
Published: October 2023

Abstract
This work presents the design of a side-coupled standing wave accelerator structure operating in S-band resonant frequency. It consists of cavity cells, side coupling cells, a power coupling cavity cell, a waveguide structure, and a magnetron operating in an S-band frequency regime. It was designed to use a more commercially available magnetron (a frequency range of 2445 to 2465 MHz). Electromagnetic analysis was performed using CST Microwave Studio’s electromagnetic field eigenmode, time domain, and PIC solvers. A cavity cell design was obtained with Q
0 of 20288 and a shunt impedance of 96.247 MΩ. The multi-cavity structure is side coupled and operates in

π
2

mode at 2453.835 MHz with a quality factor of 13376. A power coupler with a width of 1.3 cm and length of 2.9 cm transfers the RF power through a WR340 waveguide into the cavity with minimal loss. The total structure length was 52.17 cm. We achieved a peak accelerating gradient of about 22.1 MV/m at 1 Joule of stored energy and calculated a beam peak energy of 4.535 MeV.
Analysis of faculty of electrical engineering and informatics building energy use intensity in pardubice, czech
Authors: Rahardjo I A , Pidanic J , Rolecek J , Garniwa I , Suhartanto H , Soeprijanto  , Putro P A W , Imandeka E , Dung N Q , Tuan D H 
Published: October 2023

Abstract
The investigation focused on analyzing the energy usage patterns of the Faculty of Electrical Engineering and Informatics in Pardubice. The recorded energy consumption data were examined and discussed. The average heating energy consumption in the Faculty of Electrical Engineering and Informatics building in 2020, 2021, and 2022 is 686.45 MWh or 57% of the total energy equivalent value. Meanwhile, the average electricity consumption in the building during the same period is 518.97 MWh or 43% of the total energy equivalent value. The average fluctuation in heating energy consumption used in the Faculty of Electrical Engineering and Informatics building tends to increase by 2.9% per year, while the average fluctuation in electricity consumption tends to increase by 3.3% per year. According to the findings, the average comprehensive energy consumption per unit area in the building was 146,03kWh/m2. It was the sum of the energy use intensity for heating and the energy use intensity for electricity. The average energy use intensity value for heating in the building was 83.16 kWh/m2, while the average energy use intensity value for electricity was 62.78 kWh/m2.