Seawater intrusion can cause groundwater that is looked fresh initially but becomes brackish and even salty. It makes decreasing the quality of groundwater in the area. The Goa Cina Beach, Malang has a geological structure of rock in limestone, sand, and gravel. These rocks have greater porosity, so that the potential to pass water or water infiltration is also quite large, both freshwater and saltwater. Starting from these problems, it is needed to identify groundwater distribution that is not affected by the seawater intrusion process. The geoelectric method effectively determines geological parameters such as depth of bedrock, minerals, fluids, and shallow exploration to identify groundwater aquifers. Data acquisition was carried out using the geoelectrical resistivity method with Wenner configuration with three measurement points. Furthermore, the data processing used Res2dinv Software. The results showed that the measured resistivity value between 0.01000-501 Ωm with a maximum depth of 19.9 meters. The seawater intrusion distribution is assumed to be on lines 1 and 2 at an average depth of 10-19.9 meters with a resistivity value of 0.01000-0.230 Ωm. At the same time, the area that is not expected to experience seawater intrusion is on Line 3. The making of wells for coastal areas needs to consider the distance from the shoreline and rock porosity for minimizing the potential for seawater intrusion.
Traditional drying of fish, the water content produced is not in accordance with SNI (Indonesian National Standard), which is less than 40%. This research aims to determine the correlation between time and water content of fish dried with an electric-based fish dryer produced from solar panels. The method used is a quantitative method. The solar panel-based electric fish dryer has a maximum capacity of 2237 grams (12 fish) with a temperature above 30°C. Based on the data analysis, the correlation between time and water content was obtained, the results for the 1st, 2nd and 3rd experiments, the average correlation coefficient was R² = 0.99, and the correlation between the mass of dried fish and the water content of fish, the more mass of fish that is dried the more water content evaporates (dry), To meet the water content of fish that is permitted according to SNI, which is less than 40%, it takes a long time to dry. about 4 days. The heating system in the drying chamber was based on the first experiment until the third experiment, the heat was evenly distributed and quite good in the drying chamber, so that the temperature control system worked well. This solar panel-based fish drying system can be used by fishermen to lighten fish in improving the quality of their products according to SNI.
The ongoing COVID-19 pandemic has led to government decisions regarding the continuation of online lectures. This transformation becomes a problem in the ongoing compulsory course for students, namely electromagnetic experiment. Until finally the researchers chose video media as the answer to these problems. In the process, video development was carried out in two cycles. Through this development, the researcher wanted to know the ability of video in presenting data and its feasibility. The subjects of this study were students of S1 Physics Education, Universitas Negeri Malang in batch 2019 with a total of 100 people. This video was developed using the Four-D method which consists of defining, designing, and developing stages. The first cycle video acts as the preceding video and the second cycle video acts as the development result video. Practical reports and student assessment questionnaires are used as a review of development results. As a result, students obtained an average experiment report score of 93 in the first cycle and 96 in the second cycle. Student assessments related to the first cycle of media showed that 70.57% stated that they were feasible and became 79.86% in the second cycle.
The geomagnetic method is often used in petroleum, geothermal and mineral exploration and can be applied to searching prospect archaeological objects (Siahaan, 2009). Several studies has been used the geomagnetic method to seek for archaeological objects by Ariani (2012) in Losari Temples and Sismanto et al (1997) in Kedulan Temple. In Batu City there is one of the cultural heritage that have not been intact called Songgoriti Temple. So, in this research we expected the existence of temple’s rocks using geomagnetic method. The de sign of the research using geomagnetic methods begins with the study of litera ture. This research was conducted with two methods there is calculating the val ue of the magnetic susceptibility of samples Temple’s rock using Bartington Susceptibility Meter MS2B and retrieving data field using the Proton magneto meter type ENVI SCINTREX. In the end of this research, we accepted the re sults of the two methods were compared to find out the site rock of temple. In magnetometer data analysis, data is processed using Magpick software, surfer 9.0 software and Mag2dc software. The results of the research show that a local magnetic field patterns of rocks in the area of cultural heritage Songgoriti Tem ple is divided into three parts namely high local magnetic field (yellow to red), the moderate local magnetic field (green to yellow) and low local magnetic field (blue). Furthermore based on five cross-sectional modeling using Mag2dc, we obtained the prediction the site of temple Songgoriti that is the sample number 1 found on the 2 position i.e at coordinates 49S 664547.5m 9130115m and coor dinate 49S 664585m 9130105m; sample number 3 found on the 2 position i.e at coordinates 49S 664583m 9130100m and coordinate 49S 664585m 9130100m; sample number 4 found on the 2 position i.e. at coordinates 49S 664577.5m 9130115m and coordinate 49S 664577.5m 9130110m; sample number 5 found on the 3 position i.e. at coordinates 49S 664566m 9130095m, coordinates 49S 664573m 9130095m and coordinate 49S 664582.5 m 9130095m; sample num ber 6 is found in 5 position i.e. at coordinates 49S 664545.5 m 9130110m, coordinates 49S 664550m 9130110m, coordinates 49S 664546m 9130105m, coordinates 49S 664565m 9130105m and coordinates 49S 664562.5 m 9130100m. For sample number 2 that is not found at all in the five models cross section. This may be caused by the value of the magnetic susceptibility sample number 2 is minor when compared to another samples that is 0.86 x 10-6 m3/kg
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