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All Journal Eksergi: Chemical Engineering Journal ROTOR: JURNAL ILMIAH TEKNIK MESIN JURNAL ILMIAH PENDIDIKAN FISIKA AL BIRUNI Charm Sains : Jurnal Pendidikan Fisika
Samosir, Harrys
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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ADSORPSI LOGAM BERAT OLEH KARBON AKTIF BAMBU SCHIZOSTACHYUM DI AIR TANAH BALIKPAPAN Samosir, Harrys; Michael Alexander Hutabarat; Devina Sanchia Samosir
Charm Sains: Jurnal Pendidikan Fisika Vol 6 No 2 (2025): JUNI
Publisher : Program Studi Pendidikan Fisika Jurusan Fisika Fakultas Matematika, Ilmu Pengetahuan Alam, dan Kebumian (FMIPAK), Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53682/charmsains.v6i2.477

Abstract

Water pollution caused by industrial activities, particularly by heavy metals and non-biodegradable dyes, has become an increasingly serious issue. Adsorption using activated carbon is an effective, economical, and simple solution. Local bamboo such as Schizostachyum sp. from Balikpapan holds potential as a sustainable and low-cost raw material for activated carbon. This study examines the optimal production parameters by analyzing the material properties and adsorption performance. The methods used include the carbonization and activation of Schizostachyum sp. bamboo, crystal structure characterization using X-ray Diffraction (XRD), surface morphology analysis using Scanning Electron Microscopy (SEM), and the evaluation of heavy metal adsorption efficiency using Atomic Absorption Spectroscopy (AAS). The results showed a very high adsorption efficiency, with lead and cadmium removal exceeding 97%, demonstrating its potential as a non-toxic adsorbent.
UTILIZATION Of Sn-Sb-S AS A NEW MATERIAL SENSITIZED SOLAR CELLS Samosir, Harrys; Robiandi, Fadli; Shoodiqin, Dian Mart
ROTOR Vol. 17 No. 2 (2024)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/rotor.v17i2.53391

Abstract

In this research process to observe the utilization of Sn-Sb-S for new material solar cells. With the SILAR (successive ionic layer adsorption and reaction) method, it was found that good conditions for growing quantum dots on the surface of TiO2 were 8 turns to get Sn-S and 6 turns for SbS and heated at 325 0C for 12 minutes. As for tools to analyze Sn-Sb-S there are quantum dots by observing using XRD and the size of quantum dots. UV Visible is used to observe the gap energy of 1.63 eV which includes a wavelength of 300-850 nm. The use of SEM to observe the morphological characteristics of Sn-Sb-S on the surface of TiO2 obtained the size of quantum dots ~ 16.6 nm. The best sample with ZnSe passivation layer resulted in short circuit current density Jsc of 14.04 mA/cm2 open circuit voltage Voc of 0.46 V, fill factor FF of 39.91%, and power conversion efficiency η of 2.58% under 1 sun. Keywords: quantum dots, science materials, renewable energy
Formulation and Characterization of Herbal Lip Balm Utilizing Red Dragon Fruit (Hylocereus polyrhizus) Extract as a Natural Colorant and Active Ingredient Samosir, Harrys; Sarmila, Tina; Maharani, Loza Asmi Nahara; Samosir, Devina Sanchia
Eksergi Vol 23 No 1 (2026)
Publisher : Prodi Teknik Kimia UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v23i1.15867

Abstract

This study formulated an herbal lip balm using dragon fruit extract (Hylocereus spp.) as a natural colorant and moisturizer. The extract was integrated with a base of coconut oil, beeswax, cocoa butter, vitamin E, and rose water. Physical testing indicated an average pH of 5.08 and a melting point of 63–65 °C, complying with standard safety requirements for lip care products. Organoleptic evaluation by 10 panelists demonstrated high acceptance, with 90% approving the soft texture and aroma, and 85% favoring the natural pink color. The product exhibited stability over a 28-day storage period. Material characterization via X-Ray Diffraction (XRD) identified an amorphous crystal structure (2θ ≈ 25.60 ), while Scanning Electron Microscopy (SEM) revealed a porous surface with a particle distribution of 8μm. X-Ray Fluorescence (XRF) analysis confirmed the extract is rich in macro-elements, specifically Potassium (67.5%), Calcium (15.5%), Magnesium (8.5%), and Phosphorus (8.4%).
Microtremor HVSR Analysis for Characterizing Subsurface Conditions Associated with Ground Movement Susceptibility Rahmania, Rahmania; Sastrawan, Febrian Dedi; Amsal , Setiadi; Arisalwadi, Meidi; Samosir, Harrys; Rasmid, Rasmid
Jurnal Ilmiah Pendidikan Fisika Al-Biruni Vol 15 No 1 (2026): Jurnal Ilmiah Pendidikan Fisika Al-Biruni
Publisher : Universitas Islam Negeri Raden Intan Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/jipfalbiruni.v15i1.29440

Abstract

Ground movement frequently occurs in areas with complex geological settings, yet subsurface information required for hazard assessment remains limited, particularly in rapidly developing regions. This study investigated the potential of microtremor Horizontal-to-Vertical Spectral Ratio (HVSR) analysis to characterize near-surface conditions associated with ground movement susceptibility in North Balikpapan, Indonesia. Microtremor observations were conducted at 27 measurement stations and processed using Geopsy following the SESAME reliability criteria. Dominant frequency, amplification factor, and sediment thickness derived from HVSR analysis were integrated with Digital Elevation Model (DEM)-based topographic information to interpret subsurface variability. The results reveal pronounced spatial variations in subsurface characteristics across the study area. Thick unconsolidated sediment deposits associated with low dominant frequencies were predominantly identified in the central and southern regions, whereas thinner and relatively stiffer subsurface materials occurred mainly in the northeastern area. Although amplification levels were generally low to moderate, the combination of thick sediment deposits and moderate-to-steep slopes indicates conditions that may increase ground movement susceptibility. These findings demonstrate that integrating HVSR-derived parameters with topographic information provides a practical, non-invasive approach for subsurface characterization and offers valuable baseline information to support geohazard assessment and land-use planning in rapidly developing regions.
Co-Authors Amsal , Setiadi Devina Sanchia Samosir Fadli Robiandi Maharani, Loza Asmi Nahara Meidi Arisalwadi Michael Alexander Hutabarat Rahmania Rahmania Rasmid Rasmid, Rasmid Samosir, Devina Sanchia Sarmila, Tina Sastrawan, Febrian Dedi shoodiqin, dian mart