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All Journal Jurnal Penelitian Karet Abdimas Talenta : Jurnal Pengabdian Kepada Masyarakat Chemistry Indonesian Journal of Chemical Research Journal of Technomaterial Physics
Diana Alemin Barus, Diana Alemin
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Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Physics Social Sciences

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IDENTIFIKASI DAN UJI METABOLIT SEKUNDER BANGUN-BANGUN (COLEUS AMBOINICUS) TERHADAP PENYAKIT JAMUR AKAR PUTIH (RIGIDOPORUS MICROPORUS) DI LABORATORIUM Dalimunthe, Cici Indriani; Sembiring, Yan Riska Venata; Andriyanto, Mochlisin; Siregar, Tumpal HS; Darwis, Hilda Syafitri; Barus, Diana Alemin
Jurnal Penelitian Karet JPK : Volume 34, Nomor 2, Tahun 2016
Publisher : Pusat Penelitian Karet - PT. Riset Perkebunan Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22302/ppk.jpk.v34i2.295

Abstract

Penyakit Jamur Akar Putih (JAP) termasuk penyakit berbahaya ditinjau dari akibat yang ditimbulkannya dan dapat menyebabkan kerugian finansial yang dihitung secara nasional mencapai IDR 300 miliar setiap tahunnya. Pengendalian penyakit dengan memanfaatkan ekstrak bangun-bangun yang berpotensi sebagai antimikroba belum banyak diterapkan di perkebunan karet. Tujuan penelitian ini adalah untuk mengidentifikasi metabolit sekunder bangun-bangun dan mengetahui persentase penghambatan metabolit sekunder bangun-bangun terhadap penyakit JAP skala laboratorium. Penelitian menggunakan Rancangan Acak Lengkap (RAL) faktorial dengan 2 fakor dan 3 ulangan. Faktor yang digunakan adalah dosis dan pelarut (aseton, n-heksana dan metanol). Komponen yang dianalisis adalah akar dan daun bangun-bangun untuk mengetahui metabolit sekunder yang dihasilkan bangun-bangun melalui identifikasi fitokimia kemudian diekstraksi dengan berbagai pelarut untuk diuji terhadap Jamur Akar Putih (Rigidoporus microporus). Parameter yang diamati yaitu luas pertumbuhan jamur dan persentase penghambatan JAP. Hasil identifikasi fitokimia menunjukkan bahwa akar dan daun bangun-bangun mengandung senyawa flavonoida, glikosida dan saponin. Senyawa ini tergolong dalam kategori senyawa polar dan semipolar sehingga akan mudah diekstraksi dengan menggunakan pelarut polar (aseton). Uji pendahuluan ekstraksi akar dengan berbagai macam pelarut dan dosis menunjukkan interaksi yang berpengaruh nyata. Persentase penghambatan tertinggi terdapat pada ekstrak akar dengan menggunakan pelarut aseton sebesar 98,46% pada dosis 10%. Uji lanjutan hasil fraksinasi dengan menggunakan kertas cakram menunjukkan daya hambat terkuat terdapat pada fraksi n-heksana (14-18,5 cm), fraksi etil asetat (13,5-15,5 cm), dan ekstrak etanol (7-10,5 cm).
Investigation of the Effect of 60% of the Addition of Latex on Asphalt Pen 60-70 Barus, Diana Alemin
Journal of Technomaterial Physics Vol. 2 No. 2 (2020): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v2i2.5403

Abstract

This study discussed the increase of latex 60% addition to obtain the standard of asphalt 60-70. The comparison used were without the increase of latex addition (L0), 1000 g penetration of asphalt 60-70 with 100 g latex with 60 % degree or 10 phr ( L1), 1000 g penetration of asphalt 60-70 with 200 g latex 60 % degree or 20 phr ( L2), 1000 g penetration of asphalt 60-70 with 300 g latex 60 % degree or 30 phr ( L3), 1000 g penetration of asphalt 60-70 with 400 g latex 60 % degree or 40 phr ( L4). All of the samples homogenized by heating at 150ºC temperature and 250 rpm within 30 minutes then soaked in the tub for 30 minutes at 25ºC.
The Effect of Addition of Used Styrofoam on the Characteristics of Asphalt Physical Properties Barus, Diana Alemin
Journal of Technomaterial Physics Vol. 2 No. 2 (2020): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v2i2.5404

Abstract

Styrofoam had many purposes, especially for the safety of electronic objects, because it is light, durable and strong. The volume of styrofoam is enormous, reaching 30% of total waste in the world. Therefore, it causes problems if disposed of and it will become a very inconvenient waste and it can undermine the environment. This study aims to determine the effect of adding former styrofoam waste to asphalt on the characteristics of the 60/70 pen asphalt. The sample was made by melting the Styrofoam with Xylene then putting it in heated asphalt and then stirring it evenly. Next, Styrofoam enters the material into the sample container and then is refrigerated outside for 1 hour. After that, the sample is immersed in water for 3 hours. The sample meets the asphalt requirements test for each sample including penetration test, softening point, flash point, burning point, density, and ductility. This shows that the higher the concentration, the addition of styrofoam mixed with asphalt resulted in conversion and increased performance of the mixture. While at density, it appears that the addition of Styrofoam results in a lower density value.
Carbon Dots Synthesis from Soybean with Urea Doped As Sensitive Fe(II) Ion Detection Barus, Diana Alemin; Ginting, Riski Titian; Faizah, Anindya Chandra; Shafira, Rifa Dwi; Nainggolan, Kevin
Indonesian Journal of Chemical Research Vol 10 No 3 (2023): Edition for January 2023
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598//ijcr.2023.10-bar

Abstract

Synthesis of carbon dots from soybeans with urea doped (N-CDs) has been successfully conducted using the bottom-up approach via the hydrothermal method. The N-CDs showed a dark brown solution, indicating the carbon dots formed. This study analyzed the effect of optical properties before and after Fe (II) ions addition on the sensitivity of N-CDs. N-CDs characterizations were analyzed using UV-Vis Spectrophotometer and Photoluminescence Spectroscopy (PL). The results showed that the absorbance spectrum range is from 200 to 600 nm, with its absorbance peak at 290 nm. The band gap energy obtained is 3.32 eV, which indicates that N-CDs are semiconductors. The N-CDs solution resulted in good fluorescence when observed under ultraviolet light (395 nm) and emitted a bright green color. N-CDs' sensitivity when sensing Fe (II) ions with a minimum Limit of Detection (LOD) is as low as 5.7 nM. Thus, N-CDs can be used as biosensors with an easy and environmentally friendly method.
Optimization of Band Pass Filter for Variance Reduction in Determining The Solution of Moment Tensor and Focusing Mechanism with ISOLA-GUI Sequence of The Minahasa Peninsula Earthquake Date 28 September 2018 to 1 October 2018 Anggono, Titi; Tarigan, Rio Rinaldo; Barus, Diana Alemin
Journal of Technomaterial Physics Vol. 3 No. 2 (2021): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v3i2.5558

Abstract

Sulawesi is one of the islands in Indonesia with a high level of seismicity because there are many active faults, especially in the Minahasa Peninsula area. This study discusses the moment tensor solution and the focus mechanism in the Minahasa Peninsula region from 28 September 2018 to 1 October 2018 using the ISOLA-GUI program. This program is used to process seismic data from the three components recorded by the seismogram. The data used in this study were five earthquake events consisting of earthquake foreshock, earthquake mainshock, and earthquake aftershock. With the ISOLA program, data processing is carried out which includes: crustal models, event info, selecting earthquake recording stations, preparing raw data for defining seismic sources, calculating green functions with computations, performing inversions and plotting results. In the inversion, the frequency of the band pass filter is selected to obtain the optimal reduction variance. After processing, calculating and interpreting the plot results, a fault model is obtained for each earthquake event, namely strike-slip. 
The Effect of Fe3O4 Addition on the Density and Porosity of Cellulose Nanofiber Aerogel Extracted by Oil Palm Trunk Barus, Diana Alemin; Faizah, Anindya Chandra
Journal of Technomaterial Physics Vol. 5 No. 2 (2023): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v5i2.12328

Abstract

This study investigates the influence of Fe3O4 addition on cellulose nanofiber aerogels' density and porosity characteristics. The cellulose nanofiber aerogels were synthesized with varying concentrations of Fe3O4: 0%, 0.25%, 0.5%, 0.75%, and 1%. The characterization of the cellulose nanofiber aerogels included physical tests to determine density and porosity and Fourier transform infrared (FTIR) analysis for functional group analysis. The results reveal a progressive increase in density from the lowest to the highest Fe3O4 concentrations: 0.115 g/cm3, 0.135 g/cm3, 0.162 g/cm3, 0.163 g/cm3, and 0.241 g/cm3 for Fe3O4 concentrations of 0%, 0.25%, 0.5%, 0.75%, and 1%, respectively. Similarly, the porosity of the cellulose nanofiber aerogels exhibited a trend of decreasing values from the lowest to the highest Fe3O4 concentrations: 90.808%, 89.499%, 88.064%, 87.764%, and 82.844% for Fe3O4 concentrations of 0%, 0.25%, 0.5%, 0.75%, and 1%, respectively. Furthermore, FTIR analysis indicated that the structural integrity of the cellulose aerogels remained unchanged even after the incorporation of Fe3O4. While no new functional groups emerged, a discernible shift in wave numbers suggests the formation of bonds between the polymer network and Fe3O4. In conclusion, adding Fe3O4 to cellulose nanofiber aerogels led to notable alterations in density and porosity, while FTIR analysis confirmed the establishment of bonds between the polymer network and Fe3O4 without causing significant structural changes.
Effect of Activated Carbon on Cellulose Nanofiber Aerogels for Enhanced Solar Steam Generation Barus, Diana Alemin; Kevin Nainggolan
Journal of Technomaterial Physics Vol. 6 No. 2 (2024): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v6i2.12329

Abstract

The development of efficient and environmentally friendly clean water production systems is becoming increasingly important. This study focuses on an innovative evaporator for a Solar Steam Generator (SSG) system designed to produce clean water using accessible materials. The SSG evaporator is constructed from cellulose bonded with Polyvinyl Alcohol (PVA) and incorporates a freeze-drying method to enhance porosity, which improves water delivery within the SSG system. To further boost the efficiency of the evaporator, activated carbon (AC) is added due to its effective absorption of visible to infrared radiation. Evaporation rate testing demonstrates that the addition of 3 wt% AC yields an evaporation rate of 1.39 kg/m²/h and an efficiency of 58.56%. Fourier-transform infrared (FTIR) spectroscopy was employed to analyze changes in the sample after AC addition and to examine infrared absorption characteristics.
Community Empowerment Through Improving Weaving Skills to Support the Achievement of Sustainable Development Goals (SDGs) Barus, Diana Alemin; Gustanto; Masmur, Indra; Tua Raja Simbolon
ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat Vol. 10 No. 1 (2025): ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/abdimastalenta.v10i1.20079

Abstract

Sustainable economic growth is a challenge for Indonesia today. The Universitas Sumatera Utara in Strengthening SDGs promotes decent and inclusive employment opportunities, and enhances sustainable economic growth in Indonesia by working with companies, civil society organisations, and governments to create an environment that supports inclusive economic development and provides fair access to employment opportunities. The community service team through the community service institution of the Universitas Sumatera Utara plays an active role in the success of the SDGs by carrying out community service with MSME partner Kilang Tenun Sinaga. The results of the team's observations that Kilang Tenun Sinaga MSMEs have such important problems, namely the difficulty of finding employees with skilled weaving skills that cause a lack of weaving production processes that can be fulfilled when ordered, lack of employees who can increase production results, unable to expand by opening new promotional outlets while promoting production results. The solution presented by the team is to carry out community empowerment through improving weaving skills so that they will get the expected employees. This community service team with partners also through this service aims to continue weaving skills, especially ulos motifs, to become part of the world heritage in the future. From this solution, employees also get decent work and improve the community's economy in accordance with SDGs goal no. 8, namely decent work and economic growth.
Co-Authors Cici Indriani Dalimunthe Faizah, Anindya Chandra Ginting, Riski Titian Gustanto Hilda Syafitri Darwis, Hilda Syafitri Indra Masmur Kevin Nainggolan Mochlisin Andriyanto, Mochlisin Nainggolan, Kevin Shafira, Rifa Dwi Tarigan, Rio Rinaldo Titi Anggono Tua Raja Simbolon Tumpal HS Siregar, Tumpal HS Yan Riska Venata Sembiring, Yan Riska Venata