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All Journal Jurnal Fisika FLUX Jurnal Rekayasa Material, Manufaktur & Energi Jurnal Elemen Jurnal Geofisika Jurnal Engine: Energi, Manufaktur, dan Material JNANALOKA Relativitas : Jurnal Riset Inovasi Pembelajaran Fisika CHEDS: Journal of Chemistry, Education, and Science EINSTEIN (E-JOURNAL)
Ratni Sirait, Ratni
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Aerospace Engineering Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Transportation Other

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EFEKTIVITAS BRIKET KULIT PINANG TERHADAP PENURUNAN NILAI KADAR AIR DAN NILAI DENSITAS Rani Saputri; Jumiati, Ety; Sirait, Ratni
ELEMEN : JURNAL TEKNIK MESIN Vol. 10 No. 2 (2023)
Publisher : POLITALA PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34128/je.v10i2.267

Abstract

Utilization of briquettes as an alternative biomass energy source is possible. Biomass is a renewable energy source that is becoming increasingly important throughout the world. This has the potential to reduce human dependence on fossil fuels. This research aims to determine the effectiveness of reducing the water content and density values of areca nut shell briquettes. The raw materials used in making briquettes are areca nut shells and arpus adhesive, with each percentage of material and adhesive composition, namely sample A (55% : 45%), sample B (60% : 40%), sample C (65% : 35%), and sample D (70% : 30%). The results of this research obtained a water content value of 6.36% - 4.82% and a density value of 0.534 g/cm3 - 0.599 g/cm3. This water content value meets SNI 01-6235-2000 regarding wood charcoal and these briquettes are suitable to be used as a substitute for charcoal on a household scale.
PENINGKATAN KUALITAS NILAI KADAR AIR DAN KADAR ZAT TERBANG PADA SERBUK KARBON AKTIF TEMPURUNG KELAPA DENGAN VARIASI SUHU AKTIVASI Siti Putri Masyitah; Jumiati, Ety; Sirait, Ratni
ELEMEN : JURNAL TEKNIK MESIN Vol. 10 No. 2 (2023)
Publisher : POLITALA PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34128/je.v10i2.268

Abstract

This research aims to determine the characteristics of coconut shell activated carbon in powder and granular form using quantitative methods. Making activated carbon consists of preparation, carbonization and activation. Then the physical properties were tested and the analysic. Actived carbon is made through a carbonization stage at a temperature of 400°C for 2 hours and activation at a temperature of 800°C, 900°C, and 1000°C for 1 hour. The parameters used are air content and volatile substance content with active carbon quality requirements based on SNI No. 06-3730-1995. The research results showed that the best quality powdered activated carbon at a temperature of 1000°C with an air content of 6.4% and a volatile matter content of 15.2%
Pengaruh Konsentrasi KOH Terhadap Karakteristik Dan Kapasitansi Elektroda Karbon Aktif Super Kapasitor Mahyuda, Maulana; Sirait, Ratni; Lubis, Ridwan Yusuf
Rekayasa Material, Manufaktur dan Energi Vol 7, No 2: Juli 2024
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v7i2.19467

Abstract

Superkapasitor merupakan salah satu perangkat yang dapat menyimpan energi. Salah satu aspek yang dapat mempengaruhi tingkat keefektifan superkapasitor ialah luas permukaan elektroda. Sehingga karbon aktif dapat dijadikan elektroda kapasitor ialah karbon aktif. Pada penelitian ini telah dilakukan pembuatan karbon aktif yang berbahan dasar kulit singkong  sebagai bahan elektroda superkapasitor. Karbon aktif dibuat dengan suhu karbonisasi sebesar 200oC dengan memvariasikan konsentrasi KOH yakni sebesar 2,5 M, 3 M, dan 3,5 M. Penelitian ini menggunakan metode eksperimen yang  bertujuan untuk mengetahui pengaruh variasi konsentrasi KOH terhadap karakteristik dan kapasitansi elektroda karbon aktif kulit singkong. Bedasarkan hasil analisis XRF didapatkan bahwasanya karbon aktif kulit singkong didominasi oleh senyawa oksida logam K2O dan SiO2.. Luas permukaan karbon aktif tertinggi terdapat pada sampel karbon yang diaktivasi dengan konsentrasi KOH  3,5 M yaitu 12,835 m2/g. Dan nilai kapasitansi tertinggi ialah pada karbon aktif dengan aktivator KOH 3,5 M yakni sebesar 456,5 µF
Analisis Kondisi Angin Menggunakan Diagram Windrose Sebagai Potensi Pembangkit Listrik Tenaga Bayu di Kecamatan Percut Sei Tuan Kabupaten Deli Serdang Sirait, Ratni; Lubis, Lailatul Husna; Noveni, Tasya
Jurnal Engine: Energi, Manufaktur, dan Material Vol. 7 No. 2 (2023)
Publisher : Proklamasi 45 University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30588/jeemm.v7i2.1465

Abstract

Indonesia's energy needs are increasing in line with population growth, economic growth, and people's energy consumption patterns. This causes the fossil energy sources in Indonesia to continue to run low. So alternative energy is needed in the form of new and renewable energy. An analysis of surface wind patterns has been carried out in Percut Sei Tuan District, Deli Serdang Regency. This study aims to determine the conditions of wind speed and direction in Percut Sei Tuan District, Deli Serdang Regency, as a basis for knowing the potential of wind energy in the region. Diagram analysis uses the windrose method using the WRPLOTS application. The wind condition data used is daily wind direction and speed data from January 1, 2013, through December 31, 2021, based on the online BMKG database. From the results of the analysis using the windrose method, it is found that the dominant wind direction blows from the north, which occurs in January, February, March, April, November, and December. The average wind speed ranges from 2.1 to 3.6 m/s, which is relatively low when used as an alternative energy source.
Analisis Perubahan coulomb stress Gempa Bumi Cianjur 21 November 2022 Harefa, Faradilla Firdani; Lubis, Lailatul Husna; Sirait, Ratni
Jurnal Geofisika Vol 22 No 2 (2024): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v22i2.617

Abstract

The earthquake that occurred in Cianjur Regency on November 21, 2022 with a magnitude of 5.6 Mw had a huge impact, including casualties and meterial damage. The location of the earthquake based on data sourced from BMKG was at -6.870° N and 107.016° E and the earthquake occurred due to the Cugenang fault. After the 5.6 Mw earthquake was followed by a series of aftershocks. The purpose of this study was to determine the effect of coulomb stress changes on the Cianjur earthquake and the direction of aftershock distribution using the coulomb stress method. The results of this study show the effect of coulomb stress on earthquakes in Cianjur Regency forming 8 lobes. 4 red lobes that mean an increase in stress, namely (north direction is in Cipanas and Pacet sub-districts, east direction is in Cugenang sub-district, south direction is in Cireunghas sub-district, and southwest to west direction is in Cikole sub-district) with a value of 0 to 0, 2 bar and 4 blue lobes indicating a decrease in stress, namely (northeast direction in Sukaresmi sub-district, southeast direction in Warungkondang, Cibeber and Cilaku sub-districts, southwest direction in Sukaraja, Sukabumi and Sukalarang sub-districts, and west to northwest direction in Nagrak, Kadudampit and Caringin sub-districts) with a value of 0 to -0.2 bar. The distribution of aftershocks was more in Cugenang sub-district and partly in Warungkondang sub-district.
STUDI PENGARUH SUHU DAN TEKANAN UDARA TERHADAP GAYA ANGKAT PESAWAT TAHUN 2014-2021 DI BANDARA INTERNASIONAL KUALANAMU DELI SERDANG Razzaaq, Muhammad; Lubis, Lailatul Husna; Sirait, Ratni
Relativitas: Jurnal Riset Inovasi Pembelajaran Fisika Vol 7, No 2 (2024): Jurnal Riset Inovasi Pembelajaran Fisika
Publisher : Department of Physics Education, Faculty of Teacher Training and Education, UNIVERSITAS MA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/relativitas.v7i2.18923

Abstract

Penelitian ini dilakukan dengan tujuan agar mampu memberikan gambaran bagaimana adanya pengaruh suhu dan tekanan udara terhadap daya angkat pesawat selama operasi penerbangan. Berdasarkan hasil penelitian di Bandara Internasional Kualanamu, Deli Serdang, ditemukan adanya hubungan antara suhu dengan tekanan udara, hubungan tersebut sangat sifnifikan berakaitan dengan adanya operasi penerbangan pada daya angkat (lift) pesawat. Data yang digunakan berasal dari BMKG selama periode 2014-2021. Dari kedua variabel, tekanan udara memiliki pengaruh paling dominan terhadap daya angkat pesawat yang memiliki sebesar 1 nilai korelasi. Selain itu, suhu udara juga mempunyai hubungan korelasi yang sangaty berpengaruh terhadap daya angkat dengan nilai 0,9 pada bulan februari dan nilai 0,02 pada bulan november hal ini menunjukkan korelasi dibulan november sangat lemah dibandingkan dengan bulan februari
Subsurface Analysis of Sibayak Mountain Karo Regency Using Geomagnetic Method with 2D and 3D Modeling Putri, Nadinda Dwi; Lubis, Lailatul Husna; Sirait, Ratni
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 21, No 2 (2024): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/flux.v21i2.17515

Abstract

Mount Sibayak is a quaternary volcano located in the Berastagi area, located in the northern part of the island of Sumatra, approximately 25 km north of Lake Toba. However, the rocks produced are very different from rocks of the same age in Sumatra, Java, and the Toba Tufa. To dig up information about the subsurface structure of the Mount Sibayak area, Karo Regency, use Geophysics. This research uses the geomagnetic method to interpret subsurface layers and rock types based on the intensity of the magnetic field measured at the surface. Measurements were carried out using the PPM GMS 19T (Proton Procession Magnometer) tool by taking data from 51 measurement points with a range of ±10 meters at each measuring point. Data processing begins with IGRF correction, separation of regional and residual anomalies using a bandpass filter, reduction to the poles, and data interpretation. Data modeling uses Oasis Montaj for 2D modeling and ZondGM3D for 3D modeling. The subsurface lithology of Mount Sibayak, Karo Regency, can be seen in the subsurface of the research area. There are two types of rock, namely clay rock as a capping rock, which is altered due to hydrothermal flows with susceptibility contrast values ranging from berkisar  (-10 x 10-3) – (-2 x 10-3) SI and rock andesite intrusions containing hydrothermal fluids with susceptibility contrast values ranging from (35 x 10-3) – (50 x 10-3) SI
Interpretation of Subsurface Structure Based on Magnetic Anomaly Analysis as Geothermal Manifestation in Lake Linting Deli Serdang Sitompul, Yusril Padli; Sirait, Ratni; Lubis, Ridwan Yusuf
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 21, No 2 (2024): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/flux.v21i2.18592

Abstract

ABSTRACT- Research has been carried out with the aim of determining the type of subsurface lithology of the geothermal area in Lake Linting Deli Serdang, to determine the geological structure, as well as the type of rock that functions as a reservoir for geothermal manifestations. Data processing uses geomagnetic methods with a Proton Precission Magnometer (PPM) model GEM Systems type GSM-19T, starting with IGRF corrections and daily corrections as well as qualitative and quantitative interpretation. Based on 2D modeling of subsurface lithology, the reduction cross-section model to the poles of the A-A' path is dominated by dacite rock with a susceptibility of 0.003 cgs, andesite rock has a susceptibility of 0.006 cgs, and pyroclastic rock has a susceptibility of 0.001 cgs. The reduction cross-section model to the poles of the B-B' path is dominated by pyroclastic rocks with a susceptibility of 0.001 cgs, dacite rocks with a susceptibility of 0.003 cgs, and andesite rocks with a susceptibility of 0.006 cgs. The geological structure based on the pole-reduction cross-section model of the A-A' and B-B' trajectories is characterized by a graph of ups and downs from positive magnetic intensity to negative magnetic intensity, which is estimated to be a normal fault and the rock that functions as a good reservoir is dacite rock, because Dacite rock has good porosity and permeability, so that geothermal heat can be heated and accumulated well, this is based on the fact that it has a low anomaly value with an anomaly value of -44 nT. This rock is a type of volcanic igneous rock that makes up the geothermal reservoir zone
INVESTIGATION OF DOMINANT FREQUENCY AND GROUND AMPLIFICATION BASED ON HVSR MICROTREMOR METHOD IN PANGURURUAN DISTRICT, SAMOSIR Nasution, Nazaruddin; Sirait, Ratni
EINSTEIN (e-Journal) Vol. 12 No. 3 (2024): EINSTEIN (e-Journal)
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ein.v12i3.57360

Abstract

In this study, microtremor wave measurements were carried out using the HVSR (Horizontal to Vertical Spectral Ratio) method to identify earthquake vulnerability in Pangururuan District, Samosir, North Sumatra. In this study, measurements were made at 4 points scattered around the area so that the data obtained represented data in the area. Measurement of signal recording data was carried out for 50-60 minutes for each measurement point. Based on the results obtained, the dominant frequency value of the soil is in the range of 2.29 - 12.78 with a very high classification at points RGR1, RGR3 and RGR4 with type I soil classification, namely hard rock, and point RGR2 is classified as low with type IV soil classification, namely soft soil. While the amplification value in Pangururan District is still classified as a low amplification category with an amplification value of <3.
MICROTREMOR ANALYSIS IN DETERMINING LANDSLIDE POTENTIAL IN SEMBAHE VILLAGE, SIBOLANGIT DISTRICT, DELI SERDANG REGENCY Lubis, Rahmadhani; Sirait, Ratni; Lubis, Lailatul Husna
EINSTEIN (e-Journal) Vol. 12 No. 3 (2024): EINSTEIN (e-Journal)
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ein.v12i3.60753

Abstract

Sembahe Village is an area that is highly vulnerable to landslides. This is caused by steep topographic conditions and high rainfall. This research is intended to understand the characteristics and distribution of dominant frequencies, amplification factors and seismic vulnerability index on the possibility of landslides. Microtremor measurements were carried out in Hamlet 3 Sembahe Village at 2 location points which were measured using a portable seismograph / Pegasus for 2 hours with a sampling frequency. 100 Hz. Microtremor data was processed using Geopsy software using the Horizontal to Vertical Spectral Ratio (HVSR) method and each parameter was weighted using the Analytical Hierarchy Process (AHP) statistical method in determining potential landslide areas. The results obtained show that the distribution of dominant frequency values (F0) is 5.36 Hz – 5.33 Hz, amplification (A0) is 1.84 – 1.59, seismic vulnerability index (Kg) is 0.63 x 10-3s2 / cm - 0.47 x 10-3 s2/cm. Based on weight analysis using the AHP statistical method, the location point that has the highest potential for landslides is point 1
Co-Authors Fazira, Era Harefa, Faradilla Firdani Jumiati, Ety Kaban, Ela Widiarty Lubis, Lailatul Husna Lubis, Rahmadhani Lubis, Ridwan Yusuf Mahyuda, Maulana Miftahul Husnah Nabilah, Cinthia Farah Nasution, Fajar Siddik Nasution, Nazaruddin Noveni, Tasya Ong, Russell Putri, Nadinda Dwi Rani Saputri Razzaaq, Muhammad Sagala, Junaina Sahputri Siti Putri Masyitah Sitompul, Yusril Padli