bluuebunny/crossref_metadata_2025_split huggingface dataset:
Geological Structure Model for Recharge Area in Patuha Geothermal Field
Authors: Indriani Rista Fitri , Anjasmara Ira Mutiara , Utama Widya , Dzulfiqar Rafi Muhammad Erfand , Lumban Gaol Daniel Juliadro 
Published: December 2023

Abstract
Geothermal sustainability requires geological structure analysis using gravity methods for groundwater management. Geological structure analysis reviews fault data. Geological structure as a pathway for fluid movement for groundwater management in the research area, especially the Patuha Geothermal Field, West Java. This study uses global gravity model, terrestrial gravity, DEM, and geological data. The gravity method applied in this research involves calculations for latitude correction, free air correction, bouguer correction and terrain correction. The final results of this research are free air anomaly, complete Bouguer anomaly, and model evaluation (MRSE, MRE, and MAE). Free air anomaly results from free air correction of global gravity model data. DEM topography analyzes free air anomaly. The FAA data model evaluated RMSE at 1.27, MRE at 0.004, and MAE at 0.83. 138.02–280.26 mgal is the FAA range. The research area’s elevation range is 836–2431 m. Topography and free air anomaly correlate 0.75. Positive high connection. Mountains and plateaus may have positive gravity anomalies. Free air, bouguer, terrain, and CBA are applied to global gravity model data. The CBA model evaluation indicates quality. RMSE is 1.47, MRE is 0.012, and MAE is 1.11. CBA fluctuation implies fault spread. Faults serve as water flow conduits and channels, increasing the risk of infiltration. Meanwhile, cracks are being distributed as conduits and for infiltration. This research forms the basis for developing and increasing geothermal production so that further studies are needed regarding the influence of geological structures for reservoir in geothermal areas.
Deep Neural Network to Classify Seabed Sediment Using MBES Multifrequency
Authors: Khomsin  , Hadicahyo O 
Published: December 2023

AbstractThis study investigates the classification of sediment distribution and types in inland waters using Artificial Neural Network (ANN) models based on multibeam echosounder data. Multibeam Echosounder Technology (MBES) is an acoustic instrument that emits high-speed sound pulses to map the bottom of water bodies. Valuable information about sediment characteristics can be obtained by analyzing the backscattering phenomenon, which measures the acoustic intensity reflected from the water bottom. The angular response curve (ARC) method, developed by Fonseca and Calder, is employed to analyze the relationship between backscatter intensity and the angle of reflection. The ANN models in this study are trained and tested using intensity values and angular response curves obtained from multibeam echo sounders. The ANN model architecture consists of an input layer, three hidden layers, and an output layer. The sigmoid activation function is utilized in the output layer, while the ReLU activation function is applied to the input and hidden layers. Performance evaluation demonstrates that the ANN model using uncorrected data achieves remarkable accuracy, with 100% accuracy obtained in both the training and testing stages. The model exhibits a training loss value of 0.059443 and a testing loss value of 0.110030, indicating its effectiveness in capturing patterns and reducing errors. Visualizing the sediment distribution in Waduk Selorejo reveals a relatively balanced presence of Clavey sand and Sandy silt sediment types. However, noticeable differences arise between the corrected and uncorrected data, which can be attributed to the alterations made during the data correction process. The best-performing ANN model achieves a testing accuracy of 0.75, indicating that it does not perfectly predict the given data. Acknowledging the potential for prediction errors when using corrected data is important.
Construction Design of the Floater Considering the Free-Falling Impact of the Floatplane on Calm Water
Authors: Alifia Windha Umi , Sulisetyono Aries 
Published: December 2023

Abstract
The floatplane-type aircraft is very suitable to be developed as a means of transportation connecting the scattered islands in Indonesia, as it has floats under the fuselage to make landings and operate on the water surface. In bad weather, a floatplane can lose lift, resulting in a free fall from an abnormal height and a violent collision between the floatplane structure and the water surface. Meanwhile, regulations require that the strength of the structure be able to withstand the impact load due to an emergency landing. This paper proposes a floater construction design for the N219 floatplane with three scantling variations of 5083 H321 aluminium material that considers the total payload and take-off weight. The magnitude of the impact load on the bottom of the float with the water surface in the case of free fall at 0.5 m and 1 m height is predicted by the Wegner equation model at each cross section along the float. The magnitude of stress in each floater construction design is evaluated by the principle of the finite element method using commercial software. The simulation results show that all models have a maximum stress less than permissible stress and also maximum deformation is unsignificant.
Determination of Boundaries of Regional Marine Management Area in Central Sulawesi Province against Surrounding Provinces
Authors: Pribadi Cherie Bhekti , Hariyanto Teguh , Maulidi Fauzul 
Published: December 2023

Abstract
Determining the boundaries of marine management areas is very important for an area to obtain the authority in order to manage natural resources in its territorial sea as regulated in the law on regional government for exploration, exploitation, and management of marine resources. The legal basis for determining the boundaries of marine management areas is regulated in Law Number 23 of 2014 concerning Regional Government and Minister of Home Affairs Regulation Number 141 of 2017 concerning Regional Boundary Affirmations. The two legal bases are sufficient to be used as a reference in determining the boundaries of marine management for the Province of Central Sulawesi and the boundaries for the division of regional marine space for each district and city. Central Sulawesi Province has many islands around there and most of the districts and cities are coastal areas, it is deemed necessary to determine the boundaries of marine management and the division of district/municipal marine space. The method used is the baseline method, which is using the normal baseline. Based on the results obtained, the area of marine management in Central Sulawesi Province is 73,519.507 km2. For making the median line, namely between the Provinces of Central Sulawesi and North Maluku because there is an overlapping area of 1,218.042 km2. In the results obtained in the division of regency/municipal sea space, the total area is 3,3592.222 km2.The largest marine spatial distribution area is in Banggai Laut Regency with an area of 5,913.362 km2 and the smallest is Palu City at 102.024 km2.
Enhancing Sustainability and Resilience in Surabaya Coastal Residence Through Advance High Water Level Modelling
Authors: Hariyanto Irena Hana , Gede Bhadra Pranaya Sardjitha I 
Published: December 2023

Abstract
Coastal areas are increasingly vulnerable to the impacts of climate change particularly the sustainability and resilience of the coastal residences. Surabaya as a coastal city in Indonesia is not an exception in facing the significant challenges. By developing an advanced high water modelling, it could predict the impacts of high-water levels on coastal residences. The spatial and temporal patterns of flooding events are analysed, allowing for the identification of vulnerable areas. This study shows the coastal residence in Surabaya City and their potential to be affected by tidal flooding based on the high resolution satellite imagery and actual Global Navigation Satellite System (GNSS) measurements. The result shows that an area with no barrier to separate the residential area with the sea has a bigger chance to be affected by tidal flooding. In this research, the study locations are divided into northern, middle, and southern locations. It shows that the southern location is the most vulnerable residence with possibility water intrusive as far as 10 meters far from High Water Level (HWL) reference. With an accurate position of the HWL coastline, the development of settlements and coastal areas is expected to be better and safer, especially from the tidal floods.
Investigation of the process of extraction of copper from dust of electric filters of oxygen-flare smelting furnace with sulfuric, thermal, and extractive phosphoric acid
Authors: Ramazonova Dilbar , Turayev Zokirjon , Mamurov Bakhodir , Shamishova Aisholpan , Absattorov Diyorbek , Makhmayorov Jasur , Usmanov Ilkham , Samadiy Murodjon 
Published: December 2023

Abstract
The results of studies on the extraction of copper from the dust of electrostatic precipitators of oxygen-torch melting with solutions of sulfuric, thermal, extraction phosphoric depending on S:L, concentration and duration of the leaching process are presented. It has been established that the maximum degree of copper extraction is observed when using extractive phosphoric acid, which reaches more than 86%. The optimal parameters for the extraction of copper in extraction phosphoric acid are S:L = 1:10, temperature 90°C and mixing time 25-30 minutes.
Development of low cost pyranometer IoT based solar irradiance measurement station
Authors: Lim Matthew T M , Tan Rodney H G , Tan G A , Hew C H , Lee W K , Mercha Mohammed 
Published: December 2023

Abstract
This paper presents the design of self-sustainable IoT pyranometer station using low cost BPW34 photodiode. The sustainable power of the station is achieved by a 20W solar panel charges a 7.2Ah lead acid battery through a charge controller. This station uses low cost BPW34 sensors which are connected to a 16-bit ADC module to convert the analog voltage into digital data. This module is connected to an ESP32 microcontroller that connects to Wi-Fi and sends sensor readings to ThingSpeak IoT platform to allow monitoring. This study collected over 36000 data points throughout February 2023 with an average daily data loss of 2.47%. Polynomial regression method was used to determine a best fit curve equation between the BPW34 sensor and the reference sensor. The result shows that the proposed BPW34 sensor achieve the highest error of ±80W/m2 with approximate 3% of daily data. The summary, a second order polynomial equation is found best fit for the proposed low cost BPW34 sensor.
Experimental investigation on photovoltaic thermal system performance with different attachment techniques
Authors: Umam Mukhamad Faeshol , Hasanuzzaman Md , Rahim Nasrudin Abd 
Published: December 2023

Abstract
Photovoltaic thermal (PVT) systems promise a more optimal solar energy utilization by producing electricity and heat simultaneously. However, the thermal collector design and the way it is connected to the PV panels are still a problem for the PVT system. This study aims to answer the use of thermal paste and insulation in thermal collectors are some of the issues in PVT system manufacturing. An experimental study was conducted by making three scenarios of thermal collectors combined with PV panels and then tested in an indoor solar simulator. Each design was tested with five different cooling water flow rates. This study found that thermal paste and insulation can improve the electrical power of PVT systems by up to 17.59% and its thermal performance increase by 10.13%. Thus, the use of thermal paste and insulation should be done in the manufacturing of each thermal collector for PVT systems.
Energy Management Strategies of Solar Rooftop Campus with Battery Energy Storage System (BESS) And EV Supply Equipment (EVSE) using HOMER
Authors: Mazlan M A A , Dahlan N Y 
Published: December 2023

Abstract
Commercial sector has been among the largest source of electrical load demand in Malaysia including educational buildings. Nowadays, distributed energy resources, such as solar photovoltaics (PV) and battery energy storage systems (BESS), are being implemented in educational campus to save and manage its energy consumption. Additionally, electric vehicles (EV) are becoming more popular as they are more environmentally friendly than the traditional gasoline-powered cars. This research aims to examine the cost-effectiveness, environmental and technical aspects of a microgrid system that includes grid-connected solar panels, BESS and EV supply equipment (EVSE). The study was conducted for Universiti Teknologi MARA campus Pulau Pinang. The campus microgrid models are simulated using HOMER software to explore four different of microgrid configurations. The load profiles of the buildings in the campus were gathered and used in the model to identify the optimum microgrid model. The findings show Grid-PV-BESS has the best hybrid energy system based on the weightage sum decision making approach considering multiple criteria assessments. Through this study, a sustainable hybrid energy system in the educational campus can be proposed integrating solar PV, BESS and EVs.
Solution-processed lead-free cesium titanium halide perovskites and their structural and optical characteristics
Authors: Aslam Sameen , Mohamad Samsuri Siti Azrah 
Published: December 2023

Abstract
Two primary challenges impede the extensive utilization of organic-inorganic lead halide perovskites: instability and potential risk of lead contamination. This paper describes an easy and effective solution-phase method for synthesizing lead-free Cs2TiI6 perovskites using inverse temperature crystallization. The perovskite precursor was deposited on glass substrates using various methods. The Cs2TiI6 films exhibit a cubic structure with a lattice parameter of 11.57 Å. The drop-cast thin film exhibited strong and broad absorption in the visible spectrum, indicating that Cs2TiI6 possesses notable optical properties. The optical energy gap calculated for both direct and indirect is 1.68 eV and 1.65 eV, respectively). The refractive index and optical conductivity demonstrate that Cs2TiI6 is an excellent optical absorber for photodevices. This study offers valuable perspectives for the advancement of lead-free double perovskites.
Modeling and analysis of rooftop solar photovoltaic system for educational institution in Malaysia
Authors: Mohd Zublie Muhammad Firdaus , Hasanuzzaman Md. , Rahim Nasrudin Abd 
Published: December 2023

Abstract
The education sector is one of the contributors to greenhouse gas emissions. Therefore, the education sector strongly supports the government’s aspirations to reduce carbon emissions. Energy consumption is related to the amount of carbon emission production—energy consumption information helps to forecast energy savings while creating carbon emission reduction. The research aims to propose a new modeling of rooftop solar photovoltaic (PV) by installing the Net Energy Metering (NEM) meter in the Politeknik Sultan Azlan Shah (PSAS) educational institution's ring distribution system. The energy demand at PSAS in 2022 is 3,916,534 kWh/year, equivalent to an energy cost of RM 1,429,535. The new model design is based on setting 20% of the total power supply in PSAS generated by solar. A feasibility analysis on the proposed modification of the distribution layout design found that in the next four years, it is predicted that the minimum energy savings that PSAS will obtain are 2,075,763 kWh, while the annual bill savings are RM 757,654. This energy saving leads to a reduction in gas emissions where PSAS can reduce the production of 1,526,620 kg of CO2 to the environment while saving 38,165 mature trees from being cut down.
A review on blue and green hydrogen production process and their life cycle assessments
Authors: Hamed Ali Mahmoud , Tuan Kamaruddin Tengku Nordayana Akma , Ramli Nabilah , Abdul Wahab Mohd Firdaus 
Published: December 2023

Abstract
Green and blue hydrogen are two types of hydrogen generated from renewable energy sources and fossil fuels, respectively. Green hydrogen is created by splitting water molecules into oxygen and hydrogen using renewable energy sources such as wind, solar or nuclear power in a process known as electrolysis. Blue hydrogen, on the other hand, is produced by reforming natural gas and capturing and storing the resulting carbon emissions. The production of both green and blue hydrogen has implications for the environment, and a life cycle assessment (LCA) can be used to evaluate the environmental impacts of hydrogen production and use. An LCA considers the entire life cycle of a product, from raw material extraction to end-of-life disposal and assesses the potential environmental impacts at each stage. The LCA of green hydrogen production generally shows a lower environmental impact compared to blue hydrogen production. This is because green hydrogen production does not emit any carbon emissions during the process, whereas blue hydrogen production still results in the emission of carbon dioxide. However, the environmental impact of green hydrogen production can vary depending on the source of the renewable energy used for electrolysis.
Luminescence properties of Eu3+ doped Li2SrSiO4 phosphor
Authors: Bhure P P , Puppalwar S P , Tingane K T , Sahu K V , Suryawanshi S M , Bahirwar B M 
Published: December 2023

Abstract
The modified solid-state reaction method has been used in this work to prepare Eu3+ doped Li2SrSiO4. PL spectroscopy was used to investigate photoluminescence (PL) properties of the sample. X-ray powder diffraction study was used to confirm the crystalline nature and phase purity of the sample. The particle size of prepared material ranges from 37 to 56 nm was observed from XRD. From PLE and PL spectrum the excitation and emission spectra of photoluminescence for Eu3+ doped Li2SrSiO4 were recorded. The prepared Eu3+ doped Li2SrSiO4 phosphor might have application in solid state lighting.
Structural and magnetic investigation on Cr3+ substituted Mn0.25Cu0.25Zn0.5Fe2O4 nano ferrites by co-precipitation route
Authors: Balbudhe Bhaurao R. , Badwaik Dilip S. , Wandhare Rupesh S. , Sharma Ajay , Daf Sarang R. , Suryawanshi Shrikant M. 
Published: December 2023

Abstract
A low-temperature co-precipitation approach was used to prepare Mn0.25Cu0.25Zn0.5Fe2-xCrxO4 (x=0.0, 0.4). The X-ray diffraction with most intense (311) peak and crystallite size in the range 25-29 nm confirms the formation of spinel nano ferrites. The transmittance within 400-600 cm-1 for all samples confirms Fe-O bond at tetrahedral and octahedral sites of prepared spinel nano ferrites demonstrated by FTIR. The soft magnetic nature of prepared material was recorded by VSM. The small Coercivity (16.6032 &20.9224 Oe), retentivity (1.4588 &1.5617 emu/g) and magnetic saturation (23.83 &31.8169 emu/g) demonstrates superparamagnetic, pseudo single domain and randomly oriented multi-domain nature of the nano ferrites. The produced superparamagnetic nano ferrites advantageous in high frequency and biomedical applications.
pH influenced synthesis and characterization of Ni0.3Cu0.3Zn0.4 Fe2O4 nano ferrite for energy storage and high frequency applications
Authors: Suryawanshi Shrikant M. , Badwaik Dilip S. , Hedaoo Pushpalata S. , Warhate Vijay V. , Badwaik Vandana D. , Lekurwade Pranali P. 
Published: December 2023

Abstract
A spinel nanocrystalline Ni0.3Cu0.3Zn0.4 Fe2O4 was prepared using co-precipitation method maintaining pH -7,10 and 12. The pH influenced structural, spectroscopic and magnetic parameters were recorded by X-ray diffraction (XRD), FTIR and VSM. The crystallite size (31.12 nm to 45.32nm), lattice dimension (8.4175 Å to 8.4368 Å), strain (2.525x10-3 to 3.669x10-3), dislocation density (1.024 x10151/m2 to 4.867 x10151/m2) shows considerable structural enhancement due to pH variation. The Fe-O group analysis by FTIR within 400-600 cm-1 corresponds to tetrahedral (587 cm-1 to 591cm-1) and octahedral (442 cm-1 to 444 cm-1) vibration confirms the formation of spinel nanoferrites. The smooth hysteresis M-H loop with coercivity (12.5826 Oe to 11.2212 Oe), magnetic saturation (62.8431 emu/g to 66.2495 emu/g) and retentivity (0.6375 emu/g to 0.6988 emu/g) describes multi domain nature of prepared material. The obtained structural and magnetic parameter clearly indicates energy storage and high frequency application.
Actual and design wind loads for overhead transmission lines in the Central European part of Russia
Authors: Loktionov O A , Fedotova E V , Kondrateva O E , Dolchinkov N T , Kuznetsov N S 
Published: December 2023

Abstract
This paper reveals an impact of the climatic loads on the sustainable operation of power grid facilities. An overview is provided considering various international standards related to the design of overhead transmission lines. The aim of the research was to analyze and compare the actual and design values of wind loads for transmission lines located in the Central European part of Russia and operated by the power grid company “Rosseti Center and Volga Region”. An analysis of wind load dynamics has been carried out considering the territory of 9 subjects of Russia and 1983-2022 timeframe. The actual climate data were computed according to the direct measurements of the weather stations. Nomograms of the maximum annual wind speeds are formed utilizing the first limiting Gumbel distribution for two climatic regions of the research area. The retrospective wind loads values were compared against the design values. The results of the study show that climate standards should be updated more frequently as it is the case nowadays, in particular, it relates to revision of existing wind loads or recalculation of wind speed correction factors for the near future.
Design of 6 slots/10 poles modular rotor sandwich switched flux switching permanent magnet motor
Authors: Soomro Irfan Ali , Sulaiman Erwan Bin , Jenal Mahyuzie Bin , Zarafi Bin Ahmad MD , Binti Mostaman Nur Afiqah 
Published: December 2023

Abstract
Conventional flux-switching permanent magnet brushless machines (PMFSM) gained a lot of attraction due to their high torque densities, simple and robust rotor structure, and the permanent magnets and coils on the stator. The sandwich PMFSM machine has been proposed to improve the torque density of the machine in which two PM pieces are sandwiched in one stator pole to enhance the PMs usage efficiency. 2D finite element analysis (2DFEA) method is employed to compare the performance of sandwich PMFSM with salient rotor topology with that of sandwich PMFSM with modular rotor, in terms of flux linkage, flux distribution, flux strengthening, induced back EMF, cogging torque and average torque. From the results it is shown that the salient sandwich PMFSM and sandwich PMFSM modular rotor produces 9.28Nm and 6.7Nm, respectively.