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All Journal Rekayasa Mesin Civil Engineering Journal Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Jurnal Pengendalian Pencemaran Lingkungan (JPPL) Jurnal Pengabdian Masyarakat Indonesia Jurnal Portal Sipil JURNAL TEKNOLOGI MINERAL FT UNMUL
Karapa, Enos
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Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering Public Health Social Sciences

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Slope Reinforcement Model Scale Test With X-Block Karapa, Enos; Harianto, Tri; Muhiddin, A. B.; Irmawaty, Rita
Civil Engineering Journal Vol 8, No 3 (2022): March
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2022-08-03-014

Abstract

This study aims to determine the material composition and dimensions of X-block, develop a slope reinforcement model using X-block, evaluate the mechanical behavior of slopes that are reinforced with rock-bound by X-block, and analyze the performance of slope reinforcement using X-block. This research was conducted at Hasanuddin University's soil mechanics and civil engineering structure laboratory. The model scale test was employed in this study. The geometrical speciation of the test box is 150 cm in length, 60 cm in width, and 100 cm in height. The X-block model was produced using concrete with a FC of 25 MPa. The X-block was divided into two types: X-block type 1 and X-block type 2. Tensile strength testing is performed on the X-block. The slopes are made of clay soil and have a slope angle of 70 degrees. The loading test was conducted in three stages: without block, with X-block type 1, and with X-block type 2. The loading test uses a hydraulic pump equipped with a load cell and LVDT. The tensile strength of X-block type 1 is 2.56 MPa, whereas X-block type 2 has a tensile strength of 4.35 MPa. The development of the type X-block design, which is used as a retaining wall material, has shown that it can effectively withstand landslides on the slopes under consideration. The slope safety factor rose dramatically after being reinforced with type X-blocks, reaching 2.73 for both X-block type 1 and X-block type 2. Doi: 10.28991/CEJ-2022-08-03-014 Full Text: PDF
ANALISIS KESESUAIAN LAHAN BERBASIS GEOLOGI LINGKUNGAN UNTUK PENGEMBANGAN PEMUKIMAN DI KOTA JAYAPURA Kudiai, Silvester Vinsentsius; Karapa, Enos; Manalu, Janviter
Jurnal PORTAL SIPIL Vol 13 No 1 (2024): PORTAL SIPIL
Publisher : Universitas Sains dan Teknologi Jayapura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58839/jps.v13i1.1344

Abstract

Semakin meningkatnya penduduk Kota Jayapura setiap tahun sementara sebagian wilayah kota merupakan kawasan Cagar Alam Pegunungan Cycloop yang telah memberikan sumber air bersih yang melimpah dan merupakan hasil produk dari tektonik lempeng, dapat mengancam kelestarian daerah pegunungan tersebut. Pemanfaatan ruang yang tidak sesuai dengan daya dukung lingkungannya dapat menimbulkan kerusakan pada wilayah tersebut khususnya daerah yang secara ekologis sangat rentan seperti daerah resapan air dan rawan erosi. Penelitian ini bertujuan untuk memberikan rekomendasi lahan yang sesuai untuk pengembangan permukiman di lima distrik yang berada di Kota Jayapura. Kemampuan lahan berupa karakteristik fisik batuan, kemiringan lereng, bahaya geologi, potensi air tanah, struktur geologi, dan curah hujan, merupakan faktor-faktor yang sangat penting dalam penentuan kesesuaian lahan untuk budi daya. Penelitian ini menggunakan pendekatan kualitatif dengan mengumpulkan data sekunder seperti peta hidrogeologi, kemiringan lereng, serta geologi, dan kuantitatif dengan menggunakan metode skoring, bobot dan overlay (timpang susun). Hasil analisis menunjukkan bahwa wilayah penelitian terbagi menjadi 3 wilayah, yaitu wilayah kemungkinan (35%) yang siap dikembangkan untuk menjadi permukiman, wilayah kendala (40%) yang siap dikembangkan untuk menjadi permukiman namun membutuhkan rekayasa teknik, dan wilayah limitasi (25%) yang tidak cocok untuk dijadikan lahan permukiman dan lebih tepat dijadikan daerah konservasi.
Analisis Potensi Pencemaran Airtanah di Daerah Dok IV Kota Jayapura Karapa, Enos; Medyati, Novita
Jurnal Pengendalian Pencemaran Lingkungan (JPPL) Vol. 5 No. 2 (2023): JPPL, September 2023
Publisher : Pusat Penelitian dan Pengabdian Kepada Masyarakat (P3M)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/jppl.v5i2.1979

Abstract

Groundwater contamination is a threat that can endanger human health. Therefore, correct information is needed on the sources of groundwater used by the community. Seeing the development of the community around the Dok IV area which is very rapid and the use of groundwater which is quite large, it is necessary to carry out an investigation regarding groundwater in this area. This groundwater investigation aims to describe the hydrogeological conditions, to determine the chemical elements that are the pollutant load in groundwater and to determine the potential for seawater intrusion. The research method used is the hydrogeological mapping method, namely analysis of recharge and recharge areas, analysis of hydraulic slopes and well geometry. The subsurface investigation uses the subsurface estimation method with Ground Penetrating Radar (GPR). For chemical investigations carried out by taking groundwater samples and analyzing them at the Jayapura regional health laboratory.The results found showed that there were several chemical elements that exceeded the quality standard values. TDS increased in wells 1 and 2, iron increased in well 4, fecal coli in well 1 and coliform in all wells. Based on empirical calculations, the water absorption in this place is 4,069,391.723 m3. The presence of seawater is at a depth of 30 m, so it has not had an intrusive effect on groundwater.
Optimalisasi Isian Bahan Peledak Terhadap Jarak Lokasi Peledakan Dengan Penempatan Alat Dalam Kegiatan Peledakan Di Dekat Low Wall Pit. 9 Berdasarkan Nilai Peak Particle Velocity Pada PT. Alamjaya Bara Pratama Hehanussa, Michael Farissa Richardo; Nahumury, Bevieano; Karapa, Enos; Patabang, Djuardrensi
JURNAL TEKNOLOGI MINERAL FT UNMUL Vol 12, No 1 (2024): Jurnal Teknologi Mineral FT UNMUL Juni 2024
Publisher : Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/jtm.v12i1.10256

Abstract

Ground vibration adalah gelombang yang bergerak didalam tanah disebabkan oleh adanya sumber energi. Ground vibration pada peledakan disebabkan oleh beberapa hal, salah satunya yaitu pemakaian bahan peledak yang berlebihan. Peak Particle Velocity adalah salah satu kriteria untuk menentukan tingkat getaran yang berpengaruh terhadap Low Wall pada lokasi tambang. Dari pengukuran ground vibration dari tanggal 02 – 26 september 2022 dilakukan analisis menggunakan aplikasi Blastware. Hasil analisis adalah persamaan rumus hubungan antara PPV dan scaled distance (SD) yaitu PPV = 18268,2 (SD)-1,725 dengan tingkat kepercayaan data yaitu 0,787 = 78% yang menyatakan bahwa data dapat dipercaya. Persamaan rumus hubungan antara PPV dan SD kemudian digunakan untuk menentukan isian bahan peledak maksimal dan jarak yang aman untuk kegiatan peledakan yang didasarkan standar ground vibration PT. Alamjaya Bara Pratama.Kata Kunci: Ground Vibration, Peledakan, Peak Particle Velocity (PPV).
Analysis of Natural Convection Heat Transfer in Barapen Cooking in Papua Numberi, Johni Jonathan; Palamba, Pither; Giai, Agustinus; Rumar, Kristofel; Joni; Ansanay, Yane; Ranteallo, Obet T.; Siregar, Samuel P.; Kaiwai, Ruben M.; Rantepulung, Selyus; Werdani, Anastasia Sri; Griapon, Nourish; Wanane, Yohanis; Manalu, Janviter; Safanpo, Apolo; Karapa, Enos; Hartiningsih, Endang; Liga, Marthen; Wambrauw, Oscar O.; Silo, Akbar
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa & Inovasi Volume 6 Nomor 2 Tahun 2024
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v6i2.6562

Abstract

Barapen, a cooking tradition in various indigenous Papuan communities. To date, various social science studies have been conducted to examine social values, business economics, and political economy. While research in the aspects of applied science has yet to be conducted to study the phenomenon of heat transfer by natural convection from hot stones to food in cooking packs, this research was conducted. The purpose of this research is to study the phenomenon of heat transfer by natural convection from hot stones to food in cooking packs. In this study, a square-shaped artificial pool (260 cm x 210 cm x 50 cm) with white batah stone walls was used to cook food in a barapen. On the four walls, a type K thermocouple is inserted to measure the temperature at 3 layers, which will be the object of research. The ingredients are vegetables, sweet potatoes, and chicken meat that has been cut and stoned. As a discussion, the temperature gradient between layers occurs due to the difference in the amount of volumetric heat against time in each layer. The difference in the amount of heat in each layer is due to the difference in the density of the hot vapor trapped in each layer. Thus, it can be said that the cooking of food in Barapen occurs due to natural heat convection.
Optimization of Savonius Turbine Performance with Variations in Blade and Shaft Spacing on the Coast of Sarmi Regency, Papua Province Numberi, Johni Jonatan; Joni; Allo, Obed Rante; Griapon, Nourish C.; Ansanay, Yane A.; Ramandei, Lazarus; Wanane, Wilfriedf; Allo, Rombe; Manalu, Janviter; Safanpo, Apolo; Hartiningsi, Endang; Liga, Marthen; Karapa, Enos; Lefaan, Yosef; Setiadji, Prihananto; Innah, Herbert
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa & Inovasi Volume 6 Nomor 2 Tahun 2024
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v6i2.6587

Abstract

The use of wind energy as one of the producers of electrical energy is done by converting mechanical energy into electrical energy from wind turbines, one of which is the savonius wind turbine. Savonius wind turbines in use are able to work at low wind speeds. This study aims to evaluate the potential of wind energy that can be generated by optimization in savonius wind turbines by measuring the power generated by varying the gap distance between Balde and turbine shafts and analyzing the most optimal power as a source of power generation on the coast of Sarmi Regency, Papua Province. The analysis method in this study is field surveys, wind speed measurements, power optimization, BHP and tool efficiency carried out with variations in the distance between the blade and turbine shaft, namely 5 cm, 10 cm and 15 cm. The results of this study stated that the most optimal and stable results on the power generated by the turbine as well as the BHP value and the best tool efficiency were a distance variation of 15 cm with an average power value produced (P0) of 15.55 Watts, an average BHP value of 0.56 Watts and an average efficiency value of 7.59%.
Sosialisasi Mitigasi Bencana Gempa Bumi di Kampung Neirawar Kabupaten Sarmi Provinsi Papua Karapa, Enos; Yonas, Marcelino Novry
Jurnal Pengabdian Masyarakat Indonesia Vol 5 No 1 (2025): JPMI - February 2025
Publisher : CV Infinite Corporation

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52436/1.jpmi.3351

Abstract

Abstrak Intensitas gempa bumi yang terjadi di Provinsi Papua pada 5 tahun terakhir cukup tinggi. Beberapa kota dan kabupaten pada daerah pesisir seperti kota Jayapura, Kabupaten Jayapura, kabupaten Keerom dan Kabupaten Sarmi sering mengalami goncangan akibat gempa bumi. Kabupaten Sarmi merupakan salah satu daerah yang sangat sering mengalami goncangan akibat gempa bumi. Sejak tahun 2019 hingga 2024 telah terjadi lebih dari 35 gempa bumi dan gempa bumi terbesar dengan kekuaran 6,2 SR yang bersifat merusak serta memiliki potensi tsunami. Kampung Nierwawar merupakan salah satu kampung yang mengalami dampak. Di Kampung Neirawar juga telah dipasang alat deteksi dini tejadinya tsunami. Tujuan dari kegiatan pengabdian ini adalah untuk memberikan edukasi terhadap masyarakat tentang mitigasi bencana gempa bumi, meliputi tentang tanda-tanda gempa bumi, kekuatas gempa yang merusak dan tidak merusak, serta Tindakan menghadapi gempa bumi. Mitra pengabdian adalah Masyarakat kampung Neirawar Kabupaten Sarmi, metode pengabdian yang dilakukan adalah dalam bentuk ceramah, diskusi dan tanya jawab. Hasil kegiatan pengabdian kepada Masyarakat ini diharapkan pengetahuan Masyarakat tentang bencana gempa bumi serta bagaimana menghadapinya semakin meningkat.  Masyarakat mengalami peningkatan pengetahuan tentang mitigasi gempabumi sekitar 27,5 %.
CHARACTERISTICS OF COMBUSTION AND PHYSICAL PROPERTIES OF COFFEE GROUNDS AND SAGO PULP BRICKS WITH SAGO FLOUR BINDER Haurissa, Calvion Jean; Joni, Joni; Ranteallo, Obet Takke; Numberi, Johni J; Palamba, Phiter; Karapa, Enos; Haurissa, Jusuf
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/

Abstract

This study examines the production of briquettes based on agricultural waste from sago pulp and coffee grounds using natural sago flour as a binder, through a laboratory experimental approach. The analysis covers the physical and chemical characteristics, as well as the thermal performance of 3 cm cube-shaped briquettes. The results show that coffee pulp briquettes have the highest heat transfer rate (0.528 Watts) and the highest calorific value (5018 kcal/kg), indicating superior combustion efficiency compared to sago pulp briquettes (0.205 Watts; 4856 kcal/kg) and mixed briquettes (0.347 Watts; 4966 kcal/kg). These differences in characteristics were influenced by the composition of the materials, while the size of the briquettes affected the ignition time. Overall, all types of briquettes showed potential as an environmentally friendly alternative energy source based on local biomass.
Co-Authors Agustinus Giai AKBAR SILO Allo, Obed Rante Endang Hartiningsih Griapon, Nourish Griapon, Nourish C. Hartiningsi, Endang Haurissa, Calvion Jean Haurissa, Jusuf Hehanussa, Michael Farissa Richardo Herbert Innah Irmawaty, Rita Johni J Numberi Joni Kudiai, Silvester Vinsentsius Lazarus B. Ramandey, Lazarus B. Lefaan, Yosef Manalu, Janviter Marthen Liga Mickael Ruben Kaiway Muhiddin, A. B. Nahumury, Bevieano Palamba, Phiter Patabang, Djuardrensi Pither Palamba Ranteallo, Obet Rombe Allo Rumar, Kristofel Safanpo, Apolo Samuel Parlindungan Siregar Selyus Rantepulung Setiadji, Prihananto Tri Harianto Wambrauw, Oscar O. Wanane, Wilfriedf Wanane, Yohanis Werdani, Anastasia Sri Yane Oktovina Ansanay Yonas, Marcelino Novry