bluuebunny/crossref_metadata_2025_split huggingface dataset:
Sensitivity Analysis On Seven Approached Intersections In The City Of Banda Aceh
Authors: Dahlina  , Fadhly Noer , Anggraini Renni 
Published: December 2024

Abstract
The city of Banda Aceh consists of nine districts, including Ulee Kareng District, which was formed by the division of the city. One of the transportation issues in the area is frequent traffic congestion at more than four approaches. Simpang Tujuh Ulee Kareng is one such intersection that operates near capacity, rated as LOS F with a volume-to-capacity ratio > 0.85 indicating traffic stoppage. This intersection has seven approaches with 195 crossing points, 42 merging points, and 42 diverging points, making it prone to accidents and traffic jams. The objective of the study is to assess the performance and sensitivity of traffic flow, particularly its correlation with fuel consumption, using the unsignalized intersection methodology supported by the HCM 2010 method. The required data includes traffic volume, geometric, and traffic movement, which yielded an existing delay of 113.7 seconds indicating halted traffic. Sensitivity analysis showed that higher traffic flow correlates with increased fuel consumption. Based on these findings, Simpang Tujuh Ulee Kareng requires intervention. One proposed traffic management solution is the construction of roundabouts and the consolidation of intersection approach.
The Effect of Using Ureolytic Bacteria as Self-Healing Agent in Concrete on Workability, Density and Absorption
Authors: Nasytha Amathalia Laiyina , Aulia Teuku Budi , Idris Yunita 
Published: December 2024

Abstract
Concrete is one of the fastest growing construction materials in Indonesia. Concrete has a low tensile strength that causes concrete to crack easily. One way to overcome this is by using self-healing concrete. This concrete is able to repair small cracks. Ureolytic bacteria can be used as a medium in self-healing concrete. These bacteria undergo a CaCO3 precipitation process to produce calcite which later fills the cracks in the concrete. This research aims to determine the effect of the application of ureolytic bacteria on the workability, density, and absorption of high-strength concrete. Additionally, the study investigates the elemental composition of self-healing concrete using Bacillus sp., Solibacillus sp., and Staphylococcus sp. as the healing medium. In the study, the test specimens used were cubes measuring 5 cm × 5 cm × 5 cm. The tests carried out in this study were testing the workability, density, and absorption of concrete. In this study, ureolytic bacteria Bacillus sp., Solibacillus sp., and Staphylococcus sp. were used with variations of 0%, 0.5%, 0.6% and 0.7% by weight of fine aggregate. The lowest flow reduction value is found in the addition of Bacillus sp. 0.5% bacteria with a value of 2%. The decrease in density value in self-healing concrete is not too significant. The lowest decrease was found in concrete with the addition of Staphylococcus sp. 0.5% bacteria with a value of 0.3%. The lowest absorption value is found in the specimen without the addition of bacterial capsules, which is 2.44%. Energy dispersive X-ray spectroscopy (EDS) test results on ureolytic bacterial self-healing concrete show that there are elements of C, O, Mg, Al, Si, S, and Ca in this concrete.
Physical properties and compression index of embankment soil as construction material
Authors: Sundary Devi , Munirwansyah  , Azmeri  , Yunita Halida 
Published: December 2024

Abstract
Soil’s physical properties are characterized by its shape, size, color, and odor. The compression index, a key parameter of soil compressibility, is used to determine the extent of consolidation settlement. This study serves as preliminary research into alternative embankment materials for construction. The embankment soil samples were collected from ten locations in Aceh Besar district. The research aims to assess the quality of embankment soils and predict potential land subsidence, contributing to sustainable development in Aceh Province. This is particularly important because the fill soils in this area are crucial as the primary source for various development projects in Aceh Besar and Banda Aceh. The results indicate that clayey soils require careful consideration as construction materials due to their higher potential for subsidence. Conversely, silty sand or clayey soils are more suitable for construction because of their lower compressibility.
Multiscale finite element modelling of dynamic subsea power cables in bending
Authors: Smith D M , Cunningham L S , Chen L 
Published: December 2024

Abstract
This paper proposes a multiscale finite element modelling strategy for dynamic offshore power cables which allows for detailed analysis of individual components. The challenge of modelling the intricate power cores within the cable is addressed by considering a separate repeated unit cell (RUC) of the power core to define its stiffness, where the power cores themselves are then discretised with beam elements in the dynamic cable model. Periodic boundary conditions allowing for geometric non-linearity are employed at both the power core and dynamic cable scale. This means the model size can be reduced to the smallest possible RUC while still permitting non-linear material behaviour. The resulting model is capable of detailed stress analysis of individual components required for fatigue life estimation. The model is validated against existing experimental data showing strong agreement. The proposed multiscale approach may therefore be used to augment existing fatigue analysis methods for dynamic offshore cables where the stress state at individual wires is required.
Assessment of Geometric Accuracy of Indoor Mapping using Low-cost Spherical Panoramic Camera
Authors: Hidayat Husnul 
Published: December 2024

Abstract
Increasing world population multiplies the demand of living space which triggers the development of vertical settlement as the most feasible solution in major cities. Therefore the concept of 3D cadastre is now developing and mainly relies on the availability of indoor 3D data. We explore the potential of low cost spherical panoramic camera for creating 3D indoor data. This type of camera allows user to capture indoor scene into an immersive image, which provides more spatial information compared to ordinary camera. This research aims to create indoor 3D model and test the geometric accuracy of 3D positioning and measurement based on current standard of cadastral mapping in Indonesia. For the georeferencing, the ground control points were established by GPS and terrestrial surveying method. Some line segments were also measured to compare lengh measurement based on panoramic images. The results show that the best achieved accuracy has mean absolute error 0.010m, 0.020 m, and 0.022 m in X, Y, and Z direction respectively, while the mean abslute error in line segments is 0.028 m. The Root Mean Square Error of 3D positioning are 0.014 m, 0.015, and 0.004 m in X, Y, and Z direction respectively. This best accuracy corresponds to 0.031 m horizontal accuracy according to CE 90 criterion in Regulations of Head of BIG No. 15 in Year 2014. Moreover, this method allows user to generate up to 1:103th scale map according to the techinical guide of systematic land surveying and registration by Indonesian Ministry of Agrarian and Land Planning.
Hydrological Loading Variability Assessment over Java and Kalimantan from GNSS Data
Authors: Ramadhan Agustawijaya Ausa , Mutiara Anjasmara Ira , Claessens Sten 
Published: December 2024

Abstract
Global climate change has brought about significant shifts in water availability across various regions, Indonesia included. This study employs GNSS CORS (Continuously Operating Station) data to measure vertical displacements in land surface resulting from hydrological loading. The objective is to analyze the influence of terrestrial water storage (TWS) by isolating and eliminating surface loading sources detected in GNSS data while mitigating uncertainties, noise, and outliers. Along with the GPS data, we utilized GRACE and GLDAS NOAH precipitation data to examine both the spatial and temporal changes in vertical displacement, analyze and correlate these changes. In Kalimantan, vertical movements are generally stable but variable in coastal areas due to tidal effects. In Java, significant deformation occurs in the northern region due to extensive groundwater extraction and local tectonic activity. Stable precipitation on the northern and eastern sides of Kalimantan is corroborated by Terrestrial Water Storage (TWS) values, while in Java, high TWS values are observed near watersheds, correlating with vertical GNSS movements. The correlation between GNSS, precipitation, and TWSA substantiates the presence of seasonal hydrological loading. In Kalimantan, fewer stations have long-term temporal data, resulting in lower correlations between GNSS and TWSA. However, stations such as CRAU exhibit a correlation of −0.5083, indicating subsidence during periods of high TWS.
Ina-CORS Growth Story
Authors: Annuriah Mundakir Isnaini , Zafira Mukti Fanny , Mauradhia Andika , Fitri Wilma , Tri Wibowo Sidik 
Published: December 2024

Abstract
Geospatial information in Indonesia uses a single reference system, the Indonesian Geospatial Reference System 2013 (SRGI2013) to standardize spatial data and information reference. An accurate horizontal geospatial reference framework spread evenly over Indonesia is needed to make it easier for the community to use SRGI2013. One of the reference frameworks in Indonesia is the Indonesia Continuously Operating Reference Station (Ina-CORS) managed by the Geospatial Information Agency (BIG). BIG (formerly BAKOSURTANAL) started developing CORS in 1996 in 3 stations. The development has been carried out regularly almost every year since 2007. In 2024 Ina-CORS consists of 432 stations and add 41 more stations. Its field infrastructure has been updated to improve quality and service. Geospatial information system analysis of the Ina-CORS service area showed that at the end of 2024, Ina-CORS has been served rapid mapping and surveys in 81.62% of Indonesia’s urban and rural areas. The islands of Java and Bali have been completely served. The islands of Sumatra, Nusa Tenggara, Maluku, and Sulawesi are almost completely served. Meanwhile, the islands of Papua and Kalimantan still have not been optimally served. Ina-CORS has RINEX data service, Real Time Kinematic (RTK) correction, online post-processing, and other services to support surveys, mapping, disaster mitigation, and other earth science research.
Development of a high-resolution ionospheric VTEC model over Nigeria using spherical harmonics with orthogonal transformation solution
Authors: Faruna Solomon O , Wijaya Dudy D , Setyadji Bambang , Utama Aditya K , Bramanto Brian , Opaluwa Yusuf D , Okoh Daniel 
Published: December 2024

Abstract
One important ionosphere element that impacts radio signal transmission is the Vertical Total Electron Content (VTEC). Accurate estimation of VTEC is important for diverse applications such as satellite positioning, space weather forecasting, satellite communication. In regions with a sparse network of receivers, especially Nigeria, the spatial and temporal resolutions of the Global Ionospheric Maps (GIM) regularly provided by the International GNSS Service (IGS), Center for Orbit Determination in Europe (CODE), and the International Reference Ionosphere (IRI) are limited. This limits their potential to uncover local ionospheric phenomena in such areas. To address this limitation, we have developed a VTEC model for estimating high temporal-resolution VTEC and Differential Code Bias (DCB) over Nigeria using spherical harmonic expansions with an orthogonal transformation solution. Our novel method makes use of GNSS measurements from the Global Positioning System (GPS) and Global Navigation Satellite System (GLONASS) to precisely estimate VTEC and DCB. GNSS datasets in Receiver Independent EXchange (RINEX), satellite orbit (SP3) and Ionospheric Exchange (IONEX) formats from 2011 across 9 GNSS receivers in the Nigerian Geodetic Network sampled at 30-second intervals were used for this study. For this investigation, code pseudo-range observations were also smoothed using carrier phase observations. To assure data quality, we also carried out several preprocessing procedures utilizing the Melbourne-Wubbena linear and geometry-free linear combinations using an internal ITB-GNSSTEC FORTRAN application based on batch processing and least squares approaches. To validate our model, we compared the estimates with the IGS, CODE, and IRI-2020 models. Results demonstrated strong agreement with the other models with a standard deviation between 2.80 and 6.50 TECU and a correlation coefficient of not less than 0.92 at the evaluation stations. Notably, the new model aligned more closely with CODE and IGS than the IRI model. Also, the new model enabled the detection of local ionospheric VTEC post-sunset enhancement missed by GIM models. Our model also showed a strong positive correlation with the other models for quiet and disturbed days of geomagnetic activity. In Conclusively, this research has developed a high-resolution VTEC method for areas with sparse distribution of GNSS receivers, achieving a temporal resolution of 10 minutes. The ionospheric modeling in areas like Nigeria with sparse GNSS networks has greatly benefited from this research. The approach improves the precision of GNSS-based applications, such as location and navigation, by precisely calculating VTEC and DCBs. It also addresses the issue of sparse observational data in equatorial regions, offering insightful information for atmospheric and geodetic research.
Preliminary Investigation on Local Solid Earth Tides Variations in Sumatra Island Using Ina-CORS GNSS Network
Authors: Rusdiana Achmad , Meilano Irwan , Raharja Rio , Azhar Deaudin Kurniawan Fadillah 
Published: December 2024

Abstract
Solid earth tides refer to the periodic motion of the Earth’s crust caused by the gravitational forces of the Sun and Moon. In precise geodetic measurements, solid earth tides are a critical source of error that must be mitigated to achieve high accuracy. This study aims to observe variations in local solid earth tides during two significant time periods: when the Earth is at its closest point to the Sun (Perihelion) and at its farthest point (Aphelion). We used multi-day Kinematic Precise Point Positioning (KPPP) to process kinematic data, effectively eliminating discontinuities at day boundaries. Additionally, harmonic analysis with the least squares method was applied to extract tidal generation coefficients in three directions of motion. These coefficients were then compared with theoretical models of solid earth tides, focusing primarily on the largest tidal generation coefficients for amplitude and phase values to identify local variations. Our findings reveal that the lunar semidiurnal coefficient (M2) is the primary tide generator, exhibiting the highest energy percentage. Furthermore, during the Aphelion and Perihelion periods, our results showed no significant differences in tidal ranges at a 95 percent confidence level, indicating that the Sun’s influence on these tidal variations is minimal. Additionally, we compared the differences between observed M2 coefficients, and the theoretical model provided by the International Earth Rotation and Reference Systems Service (IERS) and found discrepancies that led to large tidal residuals, suggesting that local factors, such as geological features, are not fully captured by global models. In conclusion, this study provides valuable insights into understanding local solid earth tides on Sumatra Island.
Flood Inundation Distribution In Lamongan Regency Using Sentinel-1 SAR Data And Automatic Water-S1 Method
Authors: Azizah Luthfia , Bioresita Filsa , Rizqika Ayu Karina 
Published: December 2024

Abstract
The study of SAR data in mapping distribution flood inundation has yielded relevant results. The ease of obtaining data has made development application of Sentinel-1 SAR, for flood mapping. A common method used in flood mapping is thresholding, mainly by determining the threshold generated through visual observation that presented color contrast histograms. However, surface conditions of surrounding terrain can create misinformation due to increased surface roughness, like double bounce on vegetation make it more challenging. Moreover, manual threshold methods are less-time effective in trial error process from visual image interpretation. The results tend to be subjective because distribution mapping heavily relies on the operator’s visual interpretation of threshold value. To address this challenge, distribution of flood inundation will be mapped with an automatic threshold method, called Water-S1 and expected to provide more objective results. The images divided into tiles with 10 km size, each selected tiles will be modeled with data probability parameters. Distribution modeling then iterated get probability model distribution that represents each selected tile. The result is probability map of the water surface during and after flood, then subtracts to get the distribution area of flood inundation. In this research the method was applied to Lamongan Regency. The result show that the method can identify flood inundation quite satisfactory. The spatial distribution of flood inundation are detected clustered in paddy fields center of Lamongan Regency with flood area around 19,680.75 hectares.
Detection of Laterite Nickel Layer Distribution Based on Correlation of Multispectral Remote Sensing and Magnetic Satellite Data in North Konawe Region, Southeast Sulawesi
Authors: Saskia Puspitasari Alia , Ridki Permana Nanda , Gunawan Belista , Alvita Primastika Ayu 
Published: December 2024

Abstract
The demand for nickel continues to rise as an essential raw material to produce stainless steel and other metal alloys. Nickel deposits are abundant in Sulawesi Island due to their close association with tectonic plate movements. Therefore, this research aims to detect the distribution of laterite nickel based on the correlation of multispectral remote sensing and magnetic satellite methods in area X, North Konawe, Southeast Sulawesi. The remote sensing analysis utilized Landsat 8 with the combination of 6/5 band ratio to identify iron (Fe) and a 4/7 band ratio to detect quartz-bearing layers. Meanwhile, magnetic satellite data was obtained from The National Oceanic and Atmospheric Administration website with a total of 314 data. Based on the research results, there is a correlation between the two methods and geological mapping data where the iron (Fe) content in the limonite zone is dominant in the research area. The multispectral remote sensing analysis identified areas with high iron (Fe) content, which were further supported by magnetic satellite data showing magnetic anomalies from −0.312 to 0.178 nT. High anomalies within this range, particularly those between 0.004 and 0.178 nT, are indicative of layers rich in iron (Fe) within the limonite zone, thereby confirming the presence of laterite nickel deposits in the study area.
Comprehend Analysis of Surface and Subsurface Sediment Distribution Using Underwater Acoustic Instruments
Authors: Amanda Shafira , Hana Hariyanto Irena , Arief Santoso Imam 
Published: December 2024

Abstract
Ports play an important role in shipping and transporting while its fundamental challenge is sedimentation that occurs continuously at a location. A management system is required to respond to this siltation problem by dredging the underwater sediments parallel with Sustainable Development Goal 11 about sustainable cities and communities. Therefore, analyzing the area’s sediment types and distribution is necessary, especially using acoustic instruments. In this research, the dredging plan shows the relative depth distribution is around 4 to 18 meters with deep sloping topography on the north side. Furthermore, the overall result of the backscatter value of the multibeam echosounder ranges from −45.86 dB to −55.73 dB. According to the Angular Response Analysis, the sediment type of the seabed surface is clay with depths ranging up to 5.40 meters. The result of the sub-bottom profiler processing discovers step or bowl-like features where the curvature seems to have an unequal height. It considers the difference in sediment height around the area while the intensity is relatively low. Through acoustic processing analysis, it informs that the total area of 643872 m2 needs to be dredged with an estimated dredging volume of around 2181105 m3 both in surface and subsurface areas. The qualitative analysis of Multibeam Echosounder, and Sub Bottom Profiler data shows that the acoustic instrument’s products are accurate with validation data in the field.
Analysis of Sedimentation Rate at Royoq Port (Kutai Barat, Kalimatan Timur) with Hydrodynamic Modeling
Authors: Nur Febriani Farida , Aulia De Silva Nusantara Candida 
Published: December 2024

Abstract
Sedimentation in port areas can have a significant impact on port operations and shipping safety. The accumulation of sediment material in the harbor area can cause a decrease in depth, limiting the size of ships that can enter the harbor. Our research aims to analyze the flow patterns and sedimentation rates in Royoq Harbor, a crucial step toward maintaining the safety and smooth operation of the harbor. The model simulation was conducted on a 75-kilometer stretch of the Mahakam River that was separated into three monitoring locations at Royoq Port for 2023. The research method used is hydrodynamic modeling with Delft3D. The results showed that the existence of the harbor decreased current velocity to 0.5 m/s on the west side and 0.2 m/s on the east side, as well as a change in current direction around the harbor as it headed from upstream to downstream. This phenomenon triggers the formation of stagnation zones that increase the risk of sedimentation. The sedimentation rate in the study area is 96.29 m3/year or 34 tons/year. The sedimentation rate in the west of the harbor has a value of 5.49 m3/year, while in the east of the harbor it is 97.9 m3/year. In addition, the Delft3D modeling results for six months showed a change in the morphology of the water bottom in the port, with sedimentation ranging from 0.03 m to 0.4 m on the west and east sides and erosion between −0.002 m to −0.01 m on the north side. To maintain the safety and smooth operation of the harbor, it is recommended that regular monitoring of the water depth and dredge sediments be conducted if necessary, supporting SDG 9 on building resilient infrastructure.