Jurnal FisTa : Fisika dan Terapannya

Pembuatan Karbon Aktif Bambu dengan Metode Termolisis dan Karakterisasinya

Stefan Sindim, Heindrich Taunaumang, Alfrie Musa Rampengan — Tue, 31 Oct 2023 00:00:00 +0000

This study aims to determine the manufacture of bamboo activated carbon by the thermolysis method and to know how to characterize bamboo activated carbon after being activated by the thermolysis method and using an activating agent. The method used in this research is the experimental method. Bamboo is carbonized at 350°-400°C and immersed in a 20% phosphoric acid solution. Activated carbon was characterized by Fourier Transform InfraRed spectroscopy (FTIR), X-Ray Diffraction (XRD), and Scanning Electron Microsope-Energy Dispersive X-ray spectrometric (SEM-EDX). Characterization with XRD showed that the 2θ angle of the bamboo carbon after activation was 24°, 37.5°, and 44°. Characterization with FTIR showed that the functional groups detected on activated carbon were O-H, C-H alkane groups, C=O, C=C, C-C , and C-O. Characterization by SEM showed that the activated carbon from the shoots had a neat looking surface. EDX analysis showed that the elemental content of carbon electrodes colored by carbon elements was 78.38%.

Distribusi Suhu Permukaan Tanah dan Hubungannya Indeks Vegetasi di Hutan Pinus Lahendong

Novanda Tamboto, Cyrke Adfie Netty Bujung, Jeane Cornelda Rende — Tue, 31 Oct 2023 00:00:00 +0000

Pine Forest is a mountain located in North Sulawesi Province, Indonesia. The surface temperature around the Pine Forest changes from year to year. Whether the changes occurred significantly or only slightly, it certainly had an effect on the vegetation around the mountain. The purpose of this study was to determine the surface temperature and vegetation in the geothermal manifestation area around the Pine Forest based on the Remote Sensing Method. By using remote sensing can calculate the vegetation and surface temperature in the Pine Forest. In this study, the analysis uses Landsat 8 satellite imagery in 2020. According to the results, vegetation is negatively correlated with surface temperature, which means that vegetation and surface temperature are inversely correlated. The higher the vegetation, the lower the surface temperature value and vice versa, the higher the surface temperature, the lower the vegetation index.

Studi tentang Karakteristik Light Dependent Resistor

Marcelita Tjuana, Heindrich Taunaumang, Jimmy Lolowang — Tue, 31 Oct 2023 00:00:00 +0000

The purpose of the study was to analyze the relationship between the light intensity received by the LDR and the resistance it produces. In this study, the LDR components are arranged in series and parallel. Then the measurements are placed in 4 different light condition with the light source used, namely 5 watt lamps, 10 watt lamps, 15 watt lamps and conditions before the lights are turned on (dark). The tool used to measure the intensity of light is a digital lux meter and to measure the resistance value using a digital multimeter. The results of this study indicate that the greater the light intensity received by the LDR, the smaller the resulting resistance is 2 KΩ for the series circuit and 55 Ω for the parallel circuit at a light intensity of 7242 lux. Conversely, the smaller the intensity of the light received by the LDR, the greater the resistance it produces, namely when in dark conditions the resistance produced by the LDR in series is 994 KΩ and in the parallel LDR the resulting resistance reaches 1194 Ω. The resistance of a series LDR circuit is greater than the resistance of a parallel LDR circuit for each intensity of light it receives.

Profil Vertikal dan Luas Bidang Dinamika Harian Gradien Suhu Air Danau Tondano di Lokasi Budidaya dan Luar Lokasi Budidaya Ikan

Elroy Eden Egeten, Tineke Makahinda, Farly Tumimomor — Tue, 31 Oct 2023 00:00:00 +0000

This study aims to determine the temporal and spatial function of water temperature and the function of the dynamics of Lake Tondano water temperature gradient. This research method was carried out on two transects, namely at the cultivation site and outside the fish farming site. By taking data at nine different depth positions for 24 hours. Measurement time starts at 05:00 am to 05:00 am, with a time interval of 2 hours. Measurement positions according to vertical distance from the top of the water surface are 0 cm, 10 cm, 30 cm, 60 cm, 100 cm, 150 cm, 220 cm, 300 cm and 400 cm. Data processing is done by arranging the data format in matrix form, then analyzed using a program or software that includes temporal and spatial functions, functions and area of the gradient dynamics field. The results of this study show mathematical modeling that produces a continuous function of temporal and spatial changes in microclimate variables that allow the development of new parameters, namely water temperature gradient dynamics. The study was conducted on two different transects with lake ecosystem and environmental conditions that showed that the area of the field formed by the daily dynamics curve of the water temperature gradient was different for both transects.

Karakteristik Fluida Mata Air Panas Desa Kasuratan Kabupaten Minahasa menggunakan Spektroskopi Spektrofotometer dan FTIR

Tue, 31 Oct 2023 00:00:00 +0000

Indonesia has a geothermal energy potential of around 40 percent of the world's total geothermal energy, placing Indonesia as one of the countries rich in geothermal energy potential. North Sulawesi Province is one of the provinces in Indonesia that has geothermal potential. This research aims to determine the characteristics of hot spring fluids in Kasuratan Satu Village, Minahasa Regency using a spectrophotometer and FTIR. The method used is a geochemical method to study the characteristics of hot spring fluids and FTIR characterization. The results of the research show that the fluid characteristic of the hot spring manifestation in Kasuratan Satu Village is sulfate water (SO4), this is by FTIR measurements.

Pemodelan Percepatan Tanah sebagai Parameter Hazard Gempabumi menggunakan Metode Deterministic Seismic Hazard Analysis di Kota Manado

Lorensia Kainde, Cosmas Poluakan, Alfrie Musa Rampengan, Muhammad Zulkifli — Tue, 31 Oct 2023 00:00:00 +0000

Research has been carried out on modeling ground acceleration as an earthquake hazard parameter in Manado. This study aims to create an earthquake modeling scenario using Deterministic Seismic Hazard Analysis to determine the estimated PGA value and the intensity value of a significant earthquake. This study utilizes the BMKG SHAKEMAP software to determine the PGA value which is then converted into a modified Mercalli intensity value. A total of 13 modeling scenarios were built in this study. The results show that the scenario of significant earthquake modeling in Manado City and its surroundings using the 2018 BMKG catalog input shows varying results. This depends on the earthquake source parameters as well as the distance from the source to the site. Scenario model 10 is the most representative because it has the same intensity value as the June 20, 1991 earthquake. The resulting PGA value shows the area that has the highest PGA in Manado comes from the 3rd model (8.1% g) and the lowest from the model to 12 (1.4 % g). Due to the limited historical intensity data from the catalog, only 8 models out of 13 models were tested for root mean square error verification ranging values from 0 to 0.25.

Analisis Prinsip Fisika pada Tiang Lumbung Padi sebagai Kearifan Lokal Masyarakat Toraja

Paulus Pulung, Enos Lolang, Gela M. Saka Bergita — Tue, 31 Oct 2023 00:00:00 +0000

This research will provide knowledge about the existence of physics principles in rice barn poles. This study aims to analyze what physics principles just the one on the rice barn pole. The type of research used is qualitative research. Data collection was carried out through interviews, observation, and documentation. The research location was conducted in Lembang Roroan Barra'-Barra'. The results of the research show that there are physics principles to the rice barn poles that need to be known, such as density ( ), gravity (w), pressure (p), and balance (F). From data analysis density is strongly influenced by mass and volume. The higher the density of an object, the bigger it will be mass per volume. Stress can occur on the pillar with supporting stones Because the pressure generated on the pole is very large so that on the pole uses stone as a support. The balance can be seen in the pole assembly method which uses the pen and hole method as a static equilibrium

Studi Struktur Mikro dan Jenis Mineral Batuan Mata Air Panas menggunakan SEM-EDX dan FTIR di Kelurahan Woloan Satu Utara Kota Tomohon

Geraldi Saputera Kapoh, Donny Royke Wenas, Alfrie Musa Rampengan — Tue, 31 Oct 2023 00:00:00 +0000

Volcanoes around area there are usually geothermal manifestations, one of which is the hot springs manifestations in North Woloan Satu Tomohon City. The purpose of this study was to determine the microstructure and elemental composition of rocks as well as the types of rock minerals in the manifestation of hot springs in Woloan Satu Utara, Tomohon City, North Sulawesi Province. The research was carried out by analyzing the rock samples using SEM-EDX and FTIR. The results showed that the elemental composition of the rock 1 is O, Si, and Al with content percentage O 35,76%, Si 58,57%, and Al 5,67% and elemental composition of the rock 2 is O and Si with content percentage O 47,68% and Si 52,32%. From the results of FTIR characterization, for the rock 1 were obtained mineral types is Quartz (SiO2) and Kaolinite (2H2O Al2O3 2SiO2). And for the rock 2 were obtained mineral types is Quartz.