As one of unique non-volcanic geothermal field in Indonesia, mapping the groundwater flow in Nyelanding Village, South Bangka is essential as preliminary study for further exploration activity if the geothermal manifestation. In order to achieve this goal, we conduct a research using natural electrical properties of subsurface, Self-Potentials (SP) method. In this study, fixed-based technique was used where the spacing between measurement stations is the multiplication of 10 m along three lines at the study area. Raw field data (potential value) was corrected to diurnal and closure corrections. Further, SP anomaly was plotted and combined with topography data to be analyzed. The result shows potential value raging from -25mV to 100mV which in agreement with the lowest and highest elevation in topography map, respectively. This means, these values are controlled by topographic feature in the study area. Thus, in conclusion, the groundwater flows from the West to North East and South East part of the study area

Diabetes mellitus (DM) is a disease characterized by hyperglycemia due to decreased insulin secretion, or decreased insulin sensitivity, or both. If insulin is not available or the amount is low, then glucose cannot enter the cells and will continue to be in the bloodstream. DM can cause chronic complications such as eye complications, skin infections and stroke. DM treatment takes a long time by using synthetic drugs that will cause side effects, therefore the search for herbal-based drugs is the community’s choice. Idat plant (Cratoxylum glaucum) is a local plant from Bangka Belitung. Several studies on the genus Cratoxylum from China and Thailand showed a very high inhibitory ability against the inhibition of a-glucosidase enzymes, protein tyrosine phosphate, and carbohydrate hydrolysis enzymes because they contain phenolic compounds anthraquinones and xanthones. Therefore, the importance of more intensive research on C. glaucum species regarding the content of secondary metabolites in C. glaucum stems and their antidiabetic power. The extraction method in this research is maceration with ethyl acetate solvent. Qualitative examination of phenolic and flavonoid content using reagents, as well as antidiabetic testing was carried out in vitro with dengan α-glucosidase enzyme inhibition method. Based on qualitative testing of phenolic and flavonoid compounds, the content of these compounds was obtained. antidiabetic test showed that the-glucosidase inhibitor of ethyl acetate extract had very strong activity with an IC50 of 4.21 g/mL. Therefore, the stem of the idat plant can be used as a therapy for the treatment of diabetes mellitus.

This study presents the results of the Magnetotelluric (MT) survey aimed at resolving the subsurface structures in the northern part of the Pingtung Plain. Data analysis was conducted using ten local observation stations and one remote reference station. Due to the significant noise of the urban environment, the process of obtaining high-quality results proved to be challenging. The impact of such noise on the transfer function estimation is demonstrated, emphasizing the need for careful data selection and processing to mitigate its effects. The results reveal a distinct low–high–low-resistivity trend in the subsurface, with the Quaternary–Neogene sediment boundary estimated to be up to 500 m deep. Additionally, this study maps depths of up to 4 km, where it indicates possible faulting structures below the study area, which may be related to the previously assumed structures south of the study area. Given the limited, available deep subsurface information of the study area, these findings offer a preliminary understanding of the subsurface characteristics of the northern Pingtung Plain, which may contribute to ongoing research on the geological characteristics of the region while taking into account the importance of addressing urban noise when interpreting MT data.

The Bumang Watershed is a stream of water originating from the Bumang Reservoir in Kemuja Village, Bangka Regency to hold back water from flooding the surrounding rice fields. Since the Bumang watershed embankment was built, the embankment has been damaged in the upper part of the Bumang watershed. The main cause is underground erosion. The erosion caused the embankment foundation to become weak, which was identified as a weak zone. The method used to identify weak zones in the embankment is the Wenner configuration resistivity geoelectric method. The Wenner configuration has good sensitivity to lateral changes compared to other configurations. Field data acquisition consisted of four passes with different electrode lengths and spacings. Based on the 2D cross-section of the subsurface of the Bumang watershed embankment, the weak zone is located on tracks 1, 2, and 3. On track 1 it is at a depth of 2.50 m - 3.19 m and 1.30 m - 3.19 m; on track 2 it is at a depth of 0 m - 2 m; and on track 3 it is at a depth of 0 m - 7 m, 2 m - 4.50 m, and 0 m - 4 m respectively.

The characterization of the embankment can be done by constructing the shear wave velocity in subsurface. The investigation of near surface wave velocity using Rayleigh wave dispersion analysis is popular. This method is very fast and effective to construct the vertical wave velocity, but has no unique solution. As a result, the inverse modelling is often trapped in local optimums. Therefore, we used Quantum-behaved PSO to get the best solution (global optimum). Inversion method using Quantum-behaved PSO was performed on synthetic and field measurement data. Field data acquisition was executed at P80-81 using both active and passive surface waves methods. The inversion result of Rayleigh wave dispersion is shear wave velocity structure. Shear wave velocity imaging resulted by this method was used to characterize the embankment of mud flow dam in Sidoarjo (LUSI) and be compared to the resistivity measurement data. The subsurface structure which is constructed from the inversion of Rayleigh wave gives the same result as the resistivity.

This article presents a comprehensive electrical resistivity dataset of Taiwan derived from a multi-decadal compilation of magnetotelluric (MT) observations. The dataset integrates 406 MT sounding stations acquired between 1995 and 2026, providing island-wide spatial coverage of the Taiwanese orogenic belt. To ensure consistency across historical and recent measurements, all raw MT data were reprocessed using a standardized workflow based on one-dimensional (1D) inversion, generating a consistent set of resistivity-depth profiles for each station. The processed 1D results were further integrated to construct a regional three-dimensional (3D) resistivity model of Taiwan. Data processing and model generation were performed using an open-source Python-based workflow. Visualization and grid construction were implemented using the PyVista library, while interactive 3D exploration was enabled through ParaView. The dataset covers an area of approximately 38,019 km² with a perimeter of about 919 km and extends to a maximum investigation depth of 60 km. The model grid has a horizontal resolution of d_x,d_y = 5 km and a vertical resolution of d_z = 0.5 km, resulting in approximately 181,440 cells. The dataset is provided in formats compatible with commonly used geophysical and geoscientific software, including both the individual 1D inversion models and the derived regional 3D resistivity framework. These data provide a valuable resource for studies of regional tectonics, geothermal systems, and crustal structure in Taiwan. Previous scientific interpretations derived from portions of this MT dataset have been reported in Chang, et al. [1], Amania, et al. [2], Chang, et al. [3], Chen, et al. [4], Chen, et al. [5], Chen, et al. [6], Chen and Chen [7], Chiang, et al. [8], Chiang, et al. [9], Bertrand, et al. [10] and Bertrand, et al. [11].