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All Journal Agrin : Jurnal Penelitian Pertanian Spizaetus: Jurnal Biologi dan Pendidikan Biologi kawanad Jurnal Polimesin Forest and Nature
Dirhamsyah, Muhammad
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Education Electrical & Electronics Engineering Engineering Environmental Science Immunology & microbiology Materials Science & Nanotechnology Mechanical Engineering Other

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EFIKASI SUHU PROSES PRODUKSI ASAP CAIR DAN KONSENTRASI ASAP CAIR DARI KAYU LABAN (VITEX PUBESCENS) TERHADAP JAMUR OPHIOSTOMA PILIFERUM Oramahi, Hasan; Diba, Farah; Nurhaida, Nurhaida; Wahdina, Wahdina; Setyawati, Dina; Dirhamsyah, Muhammad
Agrin Vol 24, No 1 (2020): Agrin
Publisher : Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.agrin.2020.24.1.496

Abstract

Efficacy wood vinegar produced from wood laban (Vitex pubescens) against Ophiostoma piliferum fungus was evaluated. The objectives of this research to perform in vitro antifungal of wood vinegar from laban wood against O. piliferum. The source of lignocelluloses biomass was carbonization process used three temperature i.e. 350, 400 and 450 °C.  Efficacy of wood vinegar to the fungus carried on PDA (potato dextrose agar) in a Petri dish that has been mixed with the wood vinegar with a concentration of 0, 0.5, 1.0, 1.5, and 2.0 % (v/v). Antifungal test was a factorial 3 by 5 in a completely randomized design. The means were seperated using using Tukey’s test at p = 0.05. All data were analyzed using the SAS softwere (version 8.2, SAS Institute Inc., NC. USA). The test results showed that the pyrolysis suhue effect and concentration of wood vinegar on the inhibition of fungal growth. The higher pyrolysis temperature and concentration the inhibition of fungal growth was increased.Efikasi asap cair dari kayu laban (Vitex pubescens)terhadap Ophiostoma piliferum telah dilakukan.Penelitian ini bertujuan mengevaluasi kemampuan asap cair sebagai antijamur (O. piliferum) secara in vitro. Asap cair yang digunakan diperoleh dengan cara pirolisis pada suhu produksi asap cair dan konsentrasi asap cair yang berbeda. Efikasi asap cair terhadap jamur dilakukan pada media PDA (potato dextrose agar) dalam cawan Petri dengan campuran asap cair pada konsentrasi 0, 0,5, 1,5, dan 2,0 (v/v).Pengujian aktivitas antijamur dilakukan menggunakan rancangan acak lengkap tipe faktorial.Data yang diperoleh dianalisis dengan sidik ragam.Pengaruh  antarperlakuan dilakukan uji BNJ pada taraf nyata 5%. Analisis data menggunakan SAS versi 9.13. Hasil pengujian menunjukkan bahwa suhu pirolisis produksi asap cair dan konsentrasi asap cair berpengaruh terhadap daya penghambatan pertumbuhan jamur. Makin tinggi suhu pirolisis produksi asap cair dan konsentrasinya dan makin tinggi daya penghambatan terhadap pertumbuhan jamur, O. piliferum.
Identifikasi Jenis Tumbuhan Aromatik di Hutan Tembawang Bengap Desa Sape Kabupaten Sanggau Calaudianus Feri, Yosep; Yusro, Fathul; Dirhamsyah, Muhammad; Mariani, Yeni
Spizaetus: Jurnal Biologi dan Pendidikan Biologi Vol 6 No 3 (2025): Spizaetus: Jurnal Biologi dan Pendidikan Biologi
Publisher : Program Studi Pendidikan Biologi, FKIP, Universitas Nusa Nipa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55241/spibio.v6i3.619

Abstract

Tembawang forest is a form of local wisdom practiced by the people of Kalimantan in managing land sustainably, preserving high biodiversity, including aromatic plants. One of the tembawang forests that holds potential for aromatic plants and is utilized by battra (traditional healers) is the Bengap Tembawang Forest, located in Sape Village, Sanggau Regency. This study aims to identify the species of aromatic plants found in the Tembawang Bengap Forest, Sape Village, Sanggau Regency, West Kalimantan. The method used is qualitative descriptive with an exploratory approach through semi-structured interviews with battra (traditional healers), followed by species identification in the field based on morphological and organoleptic characteristics. The results of the study revealed 13 aromatic plant species from 8 botanical families, with growth forms consisting of trees (7 species), herbs (5 species), and shrubs (1 species). The plant parts used include leaves, stems, roots, and fruits. Their utilization is classified into two main functions: as traditional medicine for coughs, fevers, and digestive disorders, and as food ingredients and cooking spices. These findings highlight the importance of aromatic plants for battra in traditional medicine and daily culinary practices, while also demonstrating the functional and cultural values of aromatic plants in the tembawang ecosystem.
Pemanfaatan Google Spreadsheet Untuk Akuisisi Data Online Bagi Guru SMK di Banda Aceh Dirhamsyah, Muhammad; Away, Yuwaldi; Muslimsyah; Jamil, M.; Putra, T. Edisah; Ibrahim, Masri; Novandri, Andri
Kawanad : Jurnal Pengabdian kepada Masyarakat Vol. 2 No. 1 (2023): March
Publisher : Yayasan Kawanad

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56347/kjpkm.v2i1.100

Abstract

Data acquisition is the process of collecting data or information from various sources, including sensors, software, hardware, or humans, for use in analysis or decision-making. The purpose of data acquisition is to collect data that is accurate, reliable, and useful for further analysis or decision-making. In introducing the concept of data acquisition, acquisition introduction training was conducted for the teaching staff. Data acquisition training covers the process of transferring data from sensors to Google Sheets. For teaching staff at SMK Negeri 2 Banda Aceh, the use of Google Spreadsheets is still too common. Therefore, the community service team successfully carried out training activities on Wednesday, April 13, 2022. The training included an introduction to the ESP8266 microcontroller, then continued with the introduction of Google Spreadsheets, taught how to assemble hardware in the form of DHT11 sensors and ESP8266 microcontrollers, and carried out the process sending data as well as storing data on Google Sheets. This activity has a positive impact on improving the ability of teaching staff and indirectly can be applied in teaching materials or applied in everyday life.
Visual place recognition for autonomous mobile robot navigation using LoFTR and MAGSAC++ Aulia, Udink; Hasanuddin, Iskandar; Dirhamsyah, Muhammad; Nasaruddin, Nasaruddin
Jurnal Polimesin Vol 22, No 2 (2024): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i2.4992

Abstract

Autonomous mobile robots are defined as robotic entities capable of independent movement and intelligent decision-making, relying on their ability to perceive and analyze their surroundings, including objects in their environment. In Simultaneous Localization and Mapping (SLAM) systems, loop closure is often achieved through visual place recognition techniques, where the system compares the current visual input with previously observed scenes to identify matches. In computer vision applications, Speeded-Up Robust Features (SURF) and Scale-Invariant Feature Transform (SIFT) are popular feature extraction algorithms used for such as key point detection, matching, and image registration tasks. The choice of inlier threshold should be based on the specific characteristics of the application and the nature of the images being processed. It often requires experimentation and tuning to find the optimal balance between robustness and accuracy. It Utilizes the pre-trained Local Feature Transformer (LoFTR) and MAGSAC++ estimator to address these drawbacks by employing the number of inliers to determine the similarity between two images for visual place recognition. Our experiment demonstrates that the number of inliers can determine the similarity of locations between two images. Scale variations and translation in location significantly influence the resulting number of inliers. Comparing images from the same location and from different locations yields varying numbers of inliers. The number of inliers significantly influences the similarity of locations. At the same location, the number of inliers is above 150, while at different locations, the number is below 150.
Effect of Perforated Aluminum on Calotropis Gigantea Fiber Material’s Ability to Absorption Sound suhaeri, suhaeri; Husaini, Husaini; Dirhamsyah, Muhammad; Hasanuddin, Iskandar
Jurnal Polimesin Vol 22, No 4 (2024): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i4.5245

Abstract

Plants fibers such as Calotropis gigantea (CG) are very suitable as noise reduction material. Therefore, this research aims to determine the sound absorption coefficient of CG in the 20 mm test sample and the effect of the perforated aluminum layer on its ability. It was carried out using a test sample made with a thickness of 20 mm and 100 mm in diameter. The thickness of aluminum was 0.3 mm with hole diameters of 1 mm, 1.5 mm, and 2.5 mm. During the experiment, every sample was heated and pressed in a mold for 10 minutes at 200oC. The test equipment used is a Bruel Kjaer Type 4206 impedance tube with 100 mm in diameter. The sample was tested using the transfer function method ISO 10534-2:1998 at a frequency of 1/1 octave. The results indicated that the uncoated sample absorbed noise α = 0.01-0.07 (1-7)% higher than the sample coated with perforated aluminum. This showed that the Noise Reduction Coefficient (NRC) without aluminum coating can reduce noise by 29%, and the measured sample is categorized in class D.
Effect of Scirpus grossus fiber density on acoustic absorption characteristics for insulation use Suhaeri, Suhaeri; Husaini, Husaini; Dirhamsyah, Muhammad; Hasanuddin, Iskandar; Tajuddin, Tajuddin
Jurnal Polimesin Vol 23, No 3 (2025): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i3.7012

Abstract

Noise control is essential for achieving comfortable living and working environments. Natural fibers such as Scirpus Grossus offer a sustainable approach for sound absorption applications. This study investigates the effect of varying fiber densities of Scirpus grossus on sound absorption performance. Test specimens were fabricated at three density levels; 636.9 kg/³, 318.5 kg/m³, and 212.3 kg/m³. Each had a fixed mass of 50 grams, a diameter of 100 mm, and varying thicknesses of 10 mm, 20 mm, and 30 mm. The samples were hot-pressed at 200°C for 10 minutes. Sound absorption coefficients (SACs) were measured using a Brüel Kjær Impedance Tube Type 4206, following the transfer function method (ISO 10534-2:1998) over third-octave bands. The results show that fiber density significantly affects the sound absorption coefficient (SAC). A decrease in density to 212.3 kg/m³ led to a SAC increase of 0.12 points (approximately 20% relative to the initial SAC value of 0.5428 at 636.9 kg/m³), particularly at 4000 Hz. This indicates that lower-density samples exhibit better acoustic absorption behavior. The average Noise Reduction Coefficient (NRC) across all samples was around 45%, confirming their effectiveness in sound control. Based on SAC values, the samples are classified as Sound Absorption Class D. These findings suggest that Scirpus grossus fiber mats have strong potential for eco-friendly acoustic insulation materials, suitable for applications in building panels or vehicle interiors.
Marine Borer Resistance of Resak Wood (Vatica sp.): Assessing Durability Across Different Immersion Depths Yanti, Hikma; Riski, Muhammad; Dirhamsyah, Muhammad; Yani, Ahmad
Forest and Nature Vol. 1 No. 1 (2025): January
Publisher : Green Insight Solutions

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63357/fornature.v1i1.3

Abstract

Wood submerged in brackish and marine environments is highly susceptible to degradation by marine borers, which can compromise its structural integrity over time. Resak wood (Vatica sp.), widely used in boat construction, is frequently exposed to seawater, making it vulnerable to such bio-deterioration. This study aimed to assess the intensity of marine borer attacks on resak wood at different immersion depths (5 cm, 25 cm, and 50 cm) over three months in the estuary of Mempawah River, Mempawah Regency. Test samples (2 cm × 5 cm × 30 cm) were deployed, and data were analyzed using a Completely Randomized Design (CRD) with five replications, totaling 15 samples. The results revealed that resak wood exhibits high natural durability and is classified as durability class I, indicating strong resistance to marine borer infestations. The recorded weight loss percentages were 1.48% at 5 cm depth, 1.81% at 25 cm depth, and 2.69% at 50 cm depth, with statistical analysis confirming a significant effect of immersion depth on weight loss. This suggests that while resak wood is highly resistant, degradation intensifies with increasing submersion depth. Four marine borer species were identified in the estuarine waters of the Mempawah River: Limnoria sp., Balanus sp., Nereis sp., and Teredo sp. Their presence highlights the potential threat to submerged wooden structures in the region. Despite its durability, prolonged exposure and greater immersion depth may gradually reduce the structural performance of resak wood. Further long-term studies are recommended to evaluate its resistance under diverse environmental conditions and to explore protective treatments that could enhance its durability in marine applications.
Variation of Chemical Components in Bintangur (Callophyllum inophyllum) Wood along Stem Position and Its Potential Industrial Uses Yanti, Hikma; Alkhadi; Dirhamsyah, Muhammad; Yani, Ahmad
Forest and Nature Vol. 1 No. 4 (2025): October
Publisher : Green Insight Solutions

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63357/fornature.v1i4.29

Abstract

This study investigates the axial variation of major chemical constituents in bintangur wood (Calophyllum inophyllum), a species native to Indonesian peat forests, with emphasis on its industrial applicability. Wood samples were collected from three stem positions—base, middle, and top—to quantify extractives, holocellulose, alpha-cellulose, hemicellulose, and lignin content using the Technical Association of the Pulp and Paper Industry (TAPPI) standard methods. The results revealed a notable chemical gradient along the tree axis. Holocellulose (65.76–72.28%) and alpha-cellulose (44.56–49.61%) increased toward the upper stem, indicating enhanced suitability for pulp, paper, and bioethanol conversion at the tip region. In contrast, ethanol-benzene extractives peaked at the middle (7.26%) and declined at the tip (4.52%), while lignin exhibited a non-linear pattern, ranging between 25.47–28.64%. The moderate lignin content supports potential applications for charcoal, adhesives, phenolic derivatives, vanillin synthesis, and engineered wood products. Meanwhile, the relatively high extractive fraction suggests additional prospects for natural preservatives, essential oils, dye sources, and marine-grade timber. Overall, the distinct axial variability in chemical composition highlights the importance of stem-position-based processing optimization and demonstrates the feasibility of bintangur as a versatile raw material for biorefinery-based utilization. These findings provide baseline knowledge supporting future industrial development and valorization strategies for this under-exploited tropical hardwood.
Co-Authors ahmad yani Alkhadi Calaudianus Feri, Yosep Dina Setyawati Farah Diba Fathul Yusro Hasan Ashari Oramahi Hasanuddin, Iskandar Husaini Husaini Jamil, M. Masri Ibrahim Muhammad Riski, Muhammad Muslimsyah Nasaruddin Nasaruddin Novandri, Andri Nurhaida Nurhaida Putra, T. Edisah Suhaeri Suhaeri, Suhaeri Tajuddin Tajuddin, Tajuddin Udink Aulia Wahdina, Wahdina Yanti Hikma Yeni Mariani Yuwaldi Away