Angkasa: Jurnal Ilmiah Bidang Teknologi

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ISSN / EISSN : 2085-9503 / 2581-1355
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Benedictus Mardwianta, Abdul Haris Subarjo, Nurfi Ahmadi, Daniel Setya Budi
Angkasa: Jurnal Ilmiah Bidang Teknologi, Volume 14, pp 87-100; https://doi.org/10.28989/angkasa.v14i1.1207

Abstract:
The small size of the quadcopter and the low inertia of the drone allows the use of a simple flight control system, with the practicality of the Quadcopter it is hoped that it can be used for disaster management so as to increase regional resilience. Quadcopters issued by the company cannot be changed. This research is done by assembling the quadcopter itself and making changes to the propeller pitch to determine the effect of thrust and thrust motor on a quadcopter type x. From the results of research and calculations carried out, the thrust produced with a 50o pitch angle is greater than the 43o pitch angle for each movement, so the greater the pitch angle, the greater the thrust generated by the propeller. . The voltage that enters each motor will be different depending on its movement. So, the greater the voltage that enters the brushless motor, the higher the rotation of the motor so that the thrust generated is also greater.    Keywords quadcopter, UAV, thrust, propeller, voltage motor, region resilience Full Text: PDF (Bahasa Indonesia) References Haniffullah, A., Bangsa, I. A., & Stefanie, A. “Implementasi Quadcopter Pembawa Arm Robot Pembersih Kaca Jendela Gedung Bertingkat”. Edu Elektrika Journal, vol 9 no 2, p. 36-42. 2020. Rahman, A. K., Supriyanto, H., & Meizinta, T. “Rancang Bangun Dan Implementasi Sistem Kendali Quadcopter Melalui Jaringan Internet Berbasis Lokasi Menggunakan Smartphone Android”. In Seminar Nasional Instrumentasi, Kontrol dan Otomasi , p. 307-318, 2018. Abrari, M. G., Budiyarto, A., & Aminah, S. “Perancangan Unmanned Aerial Vehicle Berbasis Image Processing Untuk Estimasi Hasil Panen Pada Lahan Perkebunan”. SNIA (Seminar Nasional Informatika dan Aplikasinya) , Vol. 4, p. A4-9. , November. 2019. Harfina, D. M., Zaini, Z., & Wulung, W. J. “Disinfectant spraying system with quadcopter type unmanned aerial vehicle (UAV) technology as an effort to break the chain of the COVID-19 virus”. Journal of Robotics and Control (JRC), vol 2. No 6, p. 502-507. 2021. Saputra, M. A., Mardiyah, N. A., & Nasar, M. “Perancangan Sistem Pengendalian Drone Autonomous Quadcopter Dengan Smartphone Berbasis Android” . Journal of Mechatronic and Electrical Engineering, vol 1 no 1, p. 33-41. 2021. Retrieved from Ridho hendra yoga perdana, Mochammad junus, & Junaedi adi prasetyo. “Vertical Take Off Landing (VTOL) Untuk Drop Kits Pada Quadcopter”. Journal of Applied Smart Electrical Network and Systems, vo 1 no 01, p. 25 - 30. 2020. Andika, I. G., Yanti, C. P., & Cardewa, M. “Quadcopter obstacle avoidance dengan sensor inframerah untuk pemantauan bencana alam melalui udara”. Jurnal Pendidikan Teknologi dan Kejuruan, vol 15 no 1, p. 71-80. 2018. Muharani, Y. “Teknik Pendeteksian Keberadaan Korban Bencana Menggunakan Pesawat Tanpa Awak (Quadcopter)”. Doctoral dissertation, Universitas Gadjah Mada. 2017. Arnanto, A., Wulan Mei, E. T., Hizbaron, D. R., & Utami, W. “Pesawat Udara Nir Awak (Uav) Untuk Penyediaan Data Spasial Bidang Tanah Di Kawasan Rawan Bencana”. BHUMI: Jurnal Agraria Dan Pertanahan, vol 5 no 2, p. 271–281. 2019. Suroso, I. “Analisis Pemetaan Daerah Rawan Banjir Dan Longsor Dengan Drone Type Multicopter Di Girimulyo, Kabupaten Kulonprogo”. Teknika STTKD: Jurnal Teknik, Elektronik, Engine, vol 5 no 1, p. 34-43. 2018. Nurkarim, Y. A., Latipah, A. J., & Suryawan, S. H. “Drone UAV Pemadam Kebakaran Otomatis”. TEKNIMEDIA: Teknologi Informasi dan Multimedia, vol 1 no 2, p. 1-6. 2020. Prasetyo, M. D., & Yamin, M. “Pengujian Wahana Unmanned Arial Vehicle (UAV) AmphiI-Fly Evo 1.0 Untuk MisiI Pencarian Dan Penyelamatan”. Jurnal Ilmiah Teknologi dan Rekayasa, vol 23 no 3, p. 220-232. 2020. Pradika, M. I., Giyarsih, S. R., & Hartono, H. “Peran pemuda dalam pengurangan risiko bencana dan implikasinya terhadap ketahanan wilayah Desa Kepuharjo, Kecamatan Cangkringan, Kabupaten Sleman, Daerah Istimewa Yogyakarta”. Jurnal Ketahanan Nasional, vol 24 no 2, p. 261-285, 2018. Ruslanjari, D., Permana, R. S., & Wardhana, F. “Kondisi kerentanan dan ketahanan masyarakat terhadap bencana tanah longsor di Desa Pagerharjo, Kecamatan Samigaluh, Kabupaten Kulonprogo, Yogyakarta”. Jurnal Ketahanan Nasional, vol 26 no 1, p. 23-39, 2020. Setiabudi, D. H., & Subarjo, A. H. “Peningkatan Pengetahuan Masyarakat dalam Rangka Meningkatkan Ketahanan Wilayah. Abdimas Dewantara, vol 4 no 1, p. 52-64, 2021. Mantika, N. J., Hidayati, S. R., & Fathurrohmah, S. “Identifikasi Tingkat Kerentanan Bencana Di Kabupaten Gunungkidul”. Matra, vol 1 no 1, p. 59-70. 2020. Swamardika, I. A., Setiawan, I. N., & Budiastra, I. N. “Rancang Bangun Quadcopter Robot Sebagai Alat Pemantau Jarak Jauh Kawasan Lingkungan Bencana”. Seminar Nasional Sains dan Teknologi. 2014. Universitas Udayana. Podsędkowski, M., Konopiński, R., Obidowski, D., & Koter, K. “Variable pitch propeller for UAV-experimental tests”. Energies, MDPI Journal. Vol 13 no 20, 5264. 2020. Budi, D. S. “Pengaruh Variasi Pitch Propeller Terhadap Thrust Dan Voltage Motor Pada Quadcopter Tipe X”,Skripsi, Program Studi Teknik Mesin, Sekolah Tinggi Teknologi Adisutjipto, Yogyakarta. 2017. Khan, M. “Quadcopter flight dynamics”. International journal of scientific & technology research, vol 3 no 8, p. 130-135. 2014. Yulianto, S., Apriyadi, R. K., Aprilyanto, A., Winugroho, T., Ponangsera, I. S., & Wilopo, W. “Histori Bencana dan Penanggulangannya di Indonesia Ditinjau Dari Perspektif Keamanan Nasional”. PENDIPA...
Al Hussein Flowers Rizqi, Oky Sugarbo, Mayang Pitaloka
Angkasa: Jurnal Ilmiah Bidang Teknologi, Volume 14, pp 47-54; https://doi.org/10.28989/angkasa.v14i1.1208

Abstract:
The research area is located in Ponjong Subdistrict, Gunung Kidul Regency. Ponjong area specific at Tambakromo village is one of potential in landslides disaster since 2011. The outspread information about landslide and mitigation should be done in research area. The aim of this research is to get the subsurface condition and determine of landslide surface based on geoelectrical resistivity in Tambakromo area, Ponjong Subdistrict, Gunung Kidul regency. The method of this research is used geoelectrical survey by using Dipole - dipole configuration. The result of this research is the lithology of sliding surface is claystone – fine tuffaceous claystone with resistivity value of 29.9 ohmmeter based on Dipole – dipole subsurface cross section at Grogol village. The sliding surface could be found at 5 metres to 20 metres underground. At Sumberejo village, based on dipole-dipole subsurface the lithology of sliding surface is claystone – fine tuffaceous claystone with resistivity value of 6.18 to 29.9 ohmmeter at depth of 20 to 25 metres. Based on the regional stratigraphy correlation showed that the claystone or tuffaceous claystone is included in Semilir Formation. This research should be able to held for local government to proved landslide mitigation in research area. Keywords Geoelectrical; Dipole; Sliding surface; Ponjong; Landslides Full Text: PDF References D. Varnes, “Slope Movement Types and Processes,” Spec. Rep., vol. 176, pp. 11–33, 1978. R. S. Raden Ayu Ramanda, D. Noor, and I. Ridwansyah, “The potential of landslide in Lake Maninjau Catchment Area, West Sumatra,” IOP Conf. Ser. Earth Environ. Sci., vol. 311, no. 1, 2019, doi: 10.1088/1755-1315/311/1/012081. O. Trianda, R. Prastowo, and S. Novitasari, “Identifikasi Ketebalan Lapisan Lapuk di Daerah Kalirejo, Kulonprogo Berdasarkan Pengukuran Mikrotremor dalam Upaya Mitigasi Tanah Longsor,” Pros. Nas. Rekayasa Teknol. Ind. dan Inf. XIII, vol. 2018, no. November, pp. 246–253, 2018. “Warga Gunungkidul Tewas Tertimbun Longsor Saat Menambang Batu,” 2021. https://news.detik.com/berita-jawa-tengah/d-5524823/warga-gunungkidul-tewas-tertimbun-longsor-saat-menambang-batu (accessed Feb. 28, 2022). B. And et al., “Geo-Hazards LANDSLIDE HAZARD ASSESMENT ON JAVA ISLAND Case Study: Landslides In Warungkiara,” JSD.Geol, vol. 23, no. 1, 2013. “Warga Jambedawe Buka Jalur Ponjong-Tambakromo - Tribunjogja.com.” https://jogja.tribunnews.com/2011/02/07/warga-jambedawe-buka-jalur-ponjong-tambakromo (accessed Feb. 28, 2022). “Sorotgunungkidul - Media Berita Online Gunungkidul.” https://gunungkidul.sorot.co/berita-94970-jalan-surodadi-ambyar-jalur-ponjong---semin-tutup-total.html (accessed Feb. 28, 2022). A. M. Ferrero, M. R. Migliazza, M. Pirulli, and G. Umili, “Some Open Issues on Rockfall Hazard Analysis in Fractured Rock Mass: Problems and Prospects,” Rock Mech. Rock Eng., vol. 49, no. 9, pp. 3615–3629, 2016, doi: 10.1007/s00603-016-1004-2. K. Sassa, P. Canuti, and Y. Yin, “Landslide science for a Safer Geoenvironment: Volume 2: Methods of landslide studies,” Landslide Sci. a Safer Geoenvironment Vol. 2 Methods Landslide Stud., vol. 2, no. 2, pp. 1–851, 2014, doi: 10.1007/978-3-319-05050-8. A. H. F. Rizqi and W. Bambang Murti Yudhana, “Identifikasi Keberadaan Rongga sebagai Pemicu Amblesan (Sinkhole) Berdasarkan Data Geologi dan Geolistrik Di Daerah Bedoyo, Kecamatan Ponjong, Kabupaten Gunung Kidul,” J. Miner. Energi, dan Lingkung., vol. 4, no. 2, p. 32, 2021, doi: 10.31315/jmel.v4i2.3446. A. hussein flowers rizqi rizqi and W. M. B. Yudhana, “Penyelidikan Geolistrik Menggunakan Konfigurasi Schlumberger Terhadap Potensi Amblesan Daerah Ponjong, Gunung Kidul,” Kurvatek, vol. 5, no. 2, pp. 31–40, 2020, doi: 10.33579/krvtk.v5i2.1769. R. Aqwil Masithah, L. Handayani, and W. Warsiyah, “Potensi Daerah Rawan Tanah Longsor Di Kecamatan Patuk, Yogyakarta Menggunakan Sistem Informasi Geografi (Sig),” J. Rekayasa Lingkung., vol. 18, no. 2, pp. 1–25, 2020, doi: 10.37412/jrl.v18i2.32. C. S. Wardani, D. A. Nindito, and A. R. Jaya, “IDENTIFIKASI DAN ANALISA KARAKTERISTIK KETERDAPATAN SINK HOLE DI AREA PAKET PEMBANGUNAN JALAN BARU JERUKWUDEL-BARAN-DUWET, GUNUNG KIDUL, DIY,” MEDIA Ilm. Tek. SIPIL, vol. 9, no. 1, pp. 32–43, 2020. A. Susilo, E. A. Suryo, T. Rachmawati, and S. Rosyid, “Natural disaster mitigation using geophysical methods,” J. Phys. Conf. Ser., vol. 2165, p. 12015, 2022, doi: 10.1088/1742-6596/2165/1/012015. T. Listyani R.A., “Criticise of Van Zuidam Classification : A Purpose of Landform Unit,” vol. 2019, no. November, pp. 332–337, 2019. A. H. F. Rizqi, “Rekonstruksi Stratigrafi Jalur Sungai Krenceng, Ponjong, Gunung Kidul, Yogyakarta,” Journal.Itny.Ac.Id, vol. 2020, pp. 255–271, 2020, [Online]. Available: https://journal.itny.ac.id/index.php/ReTII/article/view/1987. TelfordW.M, “Applied geophysics (2nd Edition).pdf.” Press Syndicate of the University of Cambridge, New York, p. 751, 1990. N. Wiwattanachang and P. H. Giao, “Monitoring crack development in fiber concrete beam by using electrical resistivity imaging,” J. Appl. Geophys., vol. 75, no. 2, pp. 294–304, 2011, doi: 10.1016/j.jappgeo.2011.06.009. M. D. Fachrindra, B. Berliana, N. Rakhma, G. I. Sastrawiguna, and A. H. F. Rizqi, “Identifikasi Akuifer dengan Pemodelan Bawah Permukaan Menggunakan Metode Geolistrik Konfigurasi Schlumberger dan,” vol. 2021, no. November, pp. 385–392, 2021. A. H. F. Rizqi, V. Sidik, F. Fatimah, H. D. K. Wijayanti, and M. F. Qodri, “Mapping of Landslide Susceptibility based on Analytical Hierarchy Process (AHP) in Sermo Dam and its...
Helmi Fauzan Abdillah, Okto Dinaryanto, Bahrul Jalaali
Angkasa: Jurnal Ilmiah Bidang Teknologi, Volume 14, pp 65-74; https://doi.org/10.28989/angkasa.v14i1.1221

Abstract:
This study investigated the optimum value of Archimedes Screw Turbine (AST) performance by taking into account blades number. This paper also addressed the design approach based on a fixed incline angle of 30°, where this paper also addressed the design approach. Variations of the single and double blades were experimentally carried out concerning the turbine power output, torque, and rotation speed. This study's aim was related to the optimum power output between two blade variations, while the manufacturing and design steps were addressed as well. In the design process, the obtained blade length dimension was 0.180 m and 0.269 m for the single and double blades. Furthermore, the overall turbine's length was 1.7m, and the inner and outer of the turbine's radius were 0.069m and 0.128m. Meanwhile, the manufacturing process began with turbine modeling, plate cutting, plate withdrawal (thread formation), welding, and attained finishing process. Based on the experimental result, a double blade turbine generated turbine power by 48.8W at an average rotational speed of 115.3 rpm. Moreover, a single blade turbine produced 37.5W with turbine power averaging a rotational speed of 109.8 rpm. It was obtained that the values of turbine efficiency were 42% and 38% for double and single turbine types, respectively. Based on this finding, it can be suggested that a double blade was more efficient than a single one. This study is beneficial for the design consideration of the AST system. Keywords Archimedes Screw Turbine;Blade;Power; HydroPower Full Text: PDF References Dewan Energi Nasional Republik Indonesia, “Indonesia Energy Outlook 2018”, DEN, 2019 L. Lisdiyanti, Y. Hizhar, B. Yulistiyanto, “Effect of Flow Discharge and Shaft Slope of Archimedes (Screw) Turbin on the Micro-hydro Power Plant”, Dinamika Teknik Sipil, 2012 REN21, “Renewables 2013: Global Status Report, Renewable Energy Policy Network for the 21st Century”, REN, 2013 Waters, S.; Aggidis, G.A. “Over 2000 years in review: Revival of the Archimedes Screw from Pump to Turbine”. Renew. Sustain. Energy Rev. 51, 497–505. 2015 Dalley, S.; Oleson, J.P. Sennacherib, “Archimedes, and the Water Screw: The Context of Invention in the Ancient The Context of Invention in the Ancient World”. Technol. Cult. 44, 1–26. 2003 Yoosef Doost A, Lubitz WD. “Archimedes Screw Turbines: A Sustainable Development Solution for Green and Renewable Energy Generation—A Review of Potential and Design Procedures”. Sustainability. 12(18):7352. 2020 C. Rorres, “The turn of the screw: optimal design of an Archimedes screw”, J. Hydraul. Eng. 126. 2000 Hrvoje Dedić-Jandrek, Sandro Nižetić, “Small scale archimedes hydro power plant test station: Design and experimental investigation”, Journal of Cleaner Production, Volume 231, Pages 756-771, 2019 G. Müller, J. Senior, “Simplified theory of Archimedean screws”, J. Hydraul. Res. 47. 2009 Brada K. “Hydraulic screw generates electricty from micro hydropower stations (translated from German)”, vol. 14. Mitteilung: Maschinenmarkt Wurzburg; p. 52–6. 1999 Lyons M, Lubitz WD. “Archimedes Screws for microhydro power generation”. In: Proceedings of the ASME 2013 7th international conference on energy sustainability & 11th fuel cell science. Minneapolis; 2013 Hawle W, Lashofer A, Pelican B. “State of technology and desgin guidelines for the Archimedes Screw turbine”. Vienna: University of Natural REsources and Life Sciences; 2012 R. C Zafirah, A. Nurul Suraya, “Parametric study on efficiency of Archimedes screw turbine”, ARPN Journal of Engineering and Applied Sciences 11. 2016 Hizhar, Yul., Yulistianto, Bambang., Darmo, Suryo., “Rancang Bangun Dan Studi Eksperimental Pengaruh Perbedaan Jarak Pitch Dan Kemiringan Poros Terhadap Kinerja Mekanik Model Turbin Ulir 2 Blade Pada Aliran Head Rendah”, Metal: Jurnal Sistem Mekanik Dan Termal, Vol. 01 No. 01. 2017 Niemann G, Winter H, “Elemen Mesin Jilid I & II”, Erlangga, 1985 Rushadiawan, Ihsan, Pratama., “Studi Eksperimen Pengaruh Jumlah Blade Terhadap Unjuk Kerja Turbin Archimedes”, Fakultas Teknik Universitas Sebelas Maret Surakarta, Program Studi Teknik Mesin. 2019 http://dx.doi.org/10.28989/angkasa.v14i1.1221 Refbacks There are currently no refbacks.
Hendro Purnomo, R. Andy Erwin Wijaya
Angkasa: Jurnal Ilmiah Bidang Teknologi, Volume 14, pp 75-86; https://doi.org/10.28989/angkasa.v14i1.1227

Abstract:
ABSTRAK Bauksit, sebagai bijih utama aluminium, mempunyai kualitas yang baik jika mengandung kadar alumina (Al2O2) yang tinggi dan reaktif silika (RSiO2) rendah. Penelitian ini dilakukan untuk memetakan distribusi spasial kadar Al2O3 dan RSiO2 menggunakan metode interpolasi ordinary kriging (OK) dan inverse distance weighting (IDW). Fitting variogram dilakukan dengan model spherical, exponential, dan gaussian, dan pemilihan variogram dilakukan dengan parameter residual sum of square (RSS). Dalam proses interpolasi IDW menggunakan power 1, 2, 3 dan 4. Evaluasi metode interpolasi terbaik dilakukan dengan parameter root mean square error (RMSE) dan mean error (ME). Hasil penelitian menunjukkan bawa metode interpolasi OK lebih baik dibandingkan dengan metode IDW. Peta hasil interpolasi OK menggambarkan bahwa distribusi bauksit dengan konsentrasi kadar Al2O3 ≥ 48% dan RSiO2 ≤ 5% menempati kurang lebih 50% dari luas daerah penelitian. Distribusi bauksit dengan kadar tersebut masih terbuka dan menerus ke arah utara, barat dan tenggara. Kata Kunci: Bauksit, Variogram, Kriging Full Text: PDF (Bahasa Indonesia) References F. Potzolu, A. P. Papa, N. Mondillo, M. Boni, G. Balassone, and A. Mormone, “Geochemical Characterization of Bauxite Deposits from The Abruzzi Mining District (Italy), MDPI, Minerals, 8, 298, p 1-24, 2018. Husaini, D. Amalia, Yuhelda, “Pelarutan Bijih Bauksit Dengan Soda Kaustik (NaOH) Menjadi Larutan Sodium Aluminat (NaAlO2) Skala Pilot”. Jurnal Teknologi Mineral dan Batubara, Vol 12, No.3, September 2016. M. A, Shaheen, S. I. Rana, M. I. Tariq, F. Rehman, A. Karim, N. Ahmad, and S. Murtaza, “Evaluation of Bauxite of Khushab (Pakistan) As A Raw Material for Extraction of Alumium”, Pakistan Journal of Science, Vol. 62, Vol. 62, No. 2, June, p 79-83, 2010. H. L. Keith, C. Misra, A. J. Perrotta, K. Wefers, and F. S. Williams, “Aluminum Oxide, Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, 2005. T. P. Robinson, G. Metternicht, “Testing the Performance of Spatial Interpolastion Techniques for Mapping Soil Properties”, Computer and Electronics in Agriculture 50, 97-108, 2006. H. Purnomo,” A Practical Application of Inverse Distance Weighting Method to Indentify Cobalt Anomaly Distribution in Laterite Deposit (Case Study in Block R, Wasile Subdistrict, East Halmahera)” ICITID, Yogyakarta, Indonesia, August 30, 2021. H. Yimit, M. Eziz, M. Mamat, G. Tohti, “Variations in Groundwater Levels and Salinity in The Ili River irrigation Area, Xinjiang, Northwest China: a geostatistical approach”, International Journal of Sustainable Development and Word Ecology 18 (1), 55-64, 2011. J. Triantafilis, I. O. A. Odeh, and A. B. McBratney, “Five Geostatistical Models to Predict Soil Salinity from Electromagnetic Induction Data Across Irrigated Cotton, Soil Sci, Soc. Am. J. 65: 869-878, 2001. A. A. Daya, “Ordinary Kriging for The Estimation of Vein Type Copper Deposit: A Case Study of The Chelkureh, Iran”, Journal of Mining and Metallurgy, 51A (1), pp 1-14, 2015. R. E. Ouabo, A.Y. Sangodoyin, and M. B. Ogundiran, “Assesment of Ordinary Kriging and Inverse Distance Weighting Methods for Modeling Chromium and Cadmium Soil Pollution in E-Waste Sites in Douala, Cameroon”, Journal of Health and Pollution, vol.10, No.26, June 2020. D. Silitonga, D. N. Usman, Maryanto, “Estimasi Sumberdaya Bauksit Menggunakan Geostatistik dengan Metode Ordinary Kriging di PT. Inti Jaya Tambang (SIJT) Desa Sandai Kiri, Kecamatan Sandai, Kabupaten Ketapang, Provinsi Kalimantan Barat”, Prosiding Teknik Pertambangan, vol. 5, No. 2, 2019. S. J. Moss and M. E. J. Wilson, “Biogeographic Implications of The Tertiary Paleogeographic Evolution of Sulawesi and Borneo” Biogeography and Geological Evolution of SE Asia, pp.133-163, 1998. T. Van Leewen, “Twenty-Five More Years of Mineral Exploration and Discovery in Indonesia”, MGEI 10th Annivesary Special Publication, 2018. R. I. Rafianto, A. Cahyono, Yudhaswita, A. Matano, Y. Marta, “Benefication and Mineralogical Study of Bauxite Deposits in Ketapang West Kalimantan for Optimum Bayer Alumina Refinary Process”, Proceedings MGEI 8th Annual Convention, Bandung Indonesia, p.96-104, October 2016. H. Arslan, “Spatial and Temporal Mapping of Groundwater Salinity Using Ordinary Kriging and Indicator Kriging: The Case of Bafra Plain, Turkey” Agricultural Water Management 113, pp. 57-63, 2012. E. H. Isaaks and R. M. Srivastava, “Applied Geostatistics”, Oxford University Press, New York, 1989. N. Saby, D. Arrouays, L. Boulonne, C. Jolivet, A. Pochot, “Geostatistical assessment of Pb in soil around Paris”, France, Science of the Total Environment, 367, 212-221, 2006. G. P. Robertson, “GS+: Geostatistics for The Environmental Sciences”, Gamma Design Software: Palinwell, Michigan, USA, 2008. S. K. Adhikary, N. Muttil, A. G. Yilmaz, “Cokriging for Enhance Spatial Interpolation of Rainfall in Two Australian Catchments”, Hydrological Processes, 31: 2143-2161, 2017. J. Yasrebi, M. Saffari, H. Fathi, N. Karimian, M. Moazallahi, R. Gazni, “Evaluation and Comparison of Ordinary Kriging and Inverse Distance Weighting Methods for Prediction of Spatial Variability of Some Soil Chemical Parameters”, Research Journal of Biological Sciences 4 (1): 93-102, 2009. http://dx.doi.org/10.28989/angkasa.v14i1.1227 Refbacks There are currently no refbacks.
Muhammad Musyfiq Haikal, Rully Hidayat, Bahrul Jalaali
Angkasa: Jurnal Ilmiah Bidang Teknologi, Volume 14, pp 23-34; https://doi.org/10.28989/angkasa.v14i1.1170

Abstract:
A hybrid vertical take-off landing (VTOL) UAV combines the concepts of fixed-wing and rotary-wing UAV aircraft in one platform while performing in both conventional and vertical take-off landings. This aircraft has a drawback of significant drag force generated due to fixed-wing. Therefore, a Tilt-Wing often utilized to overcome this obstacle whereby it could be adjusted to the vertical and horizontal directions. To enhance the understanding of generated drag force on both wing model, this study was performed by examine the drag characteristic of the VTOL UAV. The simulations were carried out in the wind speed range by 1.4 m/s, 4.17 m/s, and 6.94 m/s. Simulation results showed that the drag of the UAV Hybrid Tilt-Wing and Fixed-Wing increased at the speed of 1.4 m/s to 6.94 m/s while the highest drag value was 177.51 N on a Fixed-Wing UAV aircraft and 1.97 N on a Tilt-Wing UAV aircraft. The result concluded that Tilt-Wing UAV has less drag which was more efficient than fixed-wing.
Achmad Wahyudi, Ahmad Sabri
Angkasa: Jurnal Ilmiah Bidang Teknologi, Volume 14, pp 35-46; https://doi.org/10.28989/angkasa.v14i1.1193

Abstract:
TNI sebagai kekuatan inti pertahanan negara mempunyai unit Satuan Siber TNI (Satsiber TNI). Namun Satsiber TNI mempunyai kendala dalam pemenuhan tenaga sumber daya manusia yang memiliki kualifikasi di bidang siber dan berdampak pada kosongnya beberapa jabatan. Sistem rekrutmen yang berjalan saat ini masih menggunakan metode tradisional. Oleh karena itu, perlu adanya aplikasi sistem penunjang keputusan dalam proses rekutmen Satsiber TNI. Metode yang dapat digunakan dalam membangun SPK adalah metode AHP dan TOPSIS. Tujuan dari penelitian ini membangun sistem penunjang keputusan berbasis website untuk memilih calon anggota Satsiber TNI menggunakan metode AHP dan TOPSIS. Penelitian ini menghasilkan aplikasi sistem penunjang keputusan yang lebih efektif dan efesien dalam proses rekrutmen calon anggota Satsiber TNI. Keywords AHP TOPSIS; Rekrutmen; SATSIBER TNI Full Text: PDF (Bahasa Indonesia) References O. Letkol, C. Ir, B. Artiadi, and M. Si, “Perlunya Pembangunan Sistem Pertahanan Siber ( Cyber Defense ) yang tangguh bagi Indonesia,” pp. 31–35. A. T. Suci, H. Asyari, A. Y. Prasetiawan, and N. A. Pratomo, “Metode Fuzzy TOPSIS Pada Pengambilan Keputusan Rekrutmen Karyawan PT. Erporate Solusi Global,” Teknoin, vol. 26, no. 1, pp. 14–22, 2020, doi: 10.20885/teknoin.vol26.iss1.art2. R. Ishak, “Sistem Penunjang Keputusan Penerimaan Karyawan Menggunakan Metode Profile Maching dan Analytical Hierachy Process Pada PT. Sunny Collection,” J. Perspekt. BSI, vol. XV, no. 2, pp. 136–146, 2017, [Online]. Available: https://ejournal.bsi.ac.id/ejurnal/index.php/perspektif/article/download/5069/3062. T. A. Widiputri et al., “Sistem Penunjang Keputusan Rekrutmen Karyawan Dengan Metode Analytical Hierarchy Process ( Ahp ) Dan Techique for Order Preference By Similarity To Ideal Solution ( Topsis ) Pada Hotel Holiday Inn Express Jiexpo,” pp. 243–250. D. A. Setiawan and Y. C. Giap, “Design of Acceptance Decision Support System for New Employees in the Technician Position Using AHP and TOPSIS Methods at CV . Techindo Global Solution,” vol. 1, no. 2, 2018. R. P. Kusumawardani and M. Agintiara, “Application of Fuzzy AHP-TOPSIS Method for Decision Making in Human Resource Manager Selection Process,” Procedia - Procedia Comput. Sci., vol. 72, pp. 638–646, 2015, doi: 10.1016/j.procs.2015.12.173. R. M. Sari, I. Rizkya, S. Oktaviana, and A. Rozzaaq, “Decision support system with TOPSIS method for lecturer appraisal in Universitas PGRI Madiun Decision support system with TOPSIS method for lecturer appraisal in Universitas PGRI Madiun,” 2019, doi: 10.1088/1742-6596/1375/1/012009. D. B. Setyohadi, “AHP-TOPSIS on Selection of New University Students and the Prediction of Future Employment,” pp. 125–130, 2017. S. Hartati and D. W. Aprilianti, “Decision Support System for Selection of Candidates for PASKIBRAKA Using the TOPSIS Method,” vol. 1, 2020. K. V. D. Jeffery L. Whitten, Lonnie D. Bentley, Metode Desain & Analisis Sistem, 6th ed. Yogyakarta: Andi, 2004. http://dx.doi.org/10.28989/angkasa.v14i1.1193 Refbacks There are currently no refbacks.
Devita Ayuni Kusumaningsih, Akhmad Adham Nur Husaen, Muhammad Zhafran Haidar Muttaqin, Dawi Karomati Baroroh
Angkasa: Jurnal Ilmiah Bidang Teknologi, Volume 14, pp 1-8; https://doi.org/10.28989/angkasa.v14i1.1082

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Tuna daksa cacat tangan atau tidak memiliki tangan merupakan sebuah kelainan anggota gerak terutama bagian atas yang menyebabkan gangguan aktivitas yang melibatkan tangan. Di sisi lain, revolusi industri 4.0 menawarkan kemudahan digitalisasi sehingga akses komputer sudah selayaknya bisa dinikmati semua orang. Namun, hal itu tak berlaku bagi tuna daksa cacat tangan terutama yang berprofesi sebagai pelukis. Era digital menuntut mereka mengembangkan lukisan dengan komputer tetapi terhambat pada aksesibilitas komputer khususnya pointer/kursor. Hal inilah yang menjadi inspirasi perancangan Difable Care (DC) Mouse yang didesain berbentuk seperti sandal yang terhubung ke komputer melalui USB wireless. Fitur DC mouse yaitu klik kanan, klik kiri, scroll, dan drag. Metode terdiri atas tahap persiapan, perancangan, serta pelaksanaan dan evaluasi. Prototipe dibuat menggunakan mesin 3D printing berbahan filamen Acrylonitrile Butadiene Styrene (ABS). DC mouse menjadi solusi aksesibilitas penyandang tuna daksa cacat tangan dalam mengoperasikan pointer komputer sehingga mampu meningkatkan produktivitas melukis. Keywords Difable Care (DC) Mouse; wireless mouse; tuna daksa cacat tangan; 3D printing Full Text: PDF (Bahasa Indonesia) References S. Widati, “Pendidikan bagi Anak Tuna Daksa,” FIP Universitas Pendidikan Indonesia, 2017. Pusat Data dan Informasi Kesejahteraan Sosial Badan Pendidikan dan Penelitian Kesejahteraan Sosial (Badiklitkesos), “Kementerian Sosial dalam Angka Pembangunan Kesejahteraan Sosial,” Kementerian Sosial Republik Indonesia, Jakarta, 2012. D. S. Murdhiyanti, “Aksesibilitas Sarana Transportasi yang Ramah bagi Penyandang Disabilitas pada Trans Jakarta,” Universitas Atmajaya, Yogyakarta, 2012. E. O. Utami, “Aksesibilitas Penyandang Tuna Daksa,” Program studi Ilmu Kesejahteraan Sosial Universitas Padjajaran, Bandung, 2018. T. F Wu, L. F. Meng, H.P Wang, W. T. Wu, dan T. Y. Li, “Computer Access Assessment for Persons with Physical Disabilities: A Guide to Assistive Technology Interventions,” Computers Helping People with Special Needs, pp. 204-211. M. Helander, “A Guide to Human Factors and Ergonomics Second Edition,” CRC Press, Florida, 2006. A. Rahman, “Rekap Data Antropometri Indonesia,” Perhimpunan Ergonomi Indonesia, www.antropometriindonesia.org diakses pada 2 Desember 2018. A. E. Tontowi, “Desain Produk Inovatif dan Inubasi Bisnis Kompetitif,” UGM Press, Yogyakarta, 2016. Avago Technologies, “ADNK-7533-TN24 USB 2.4 GHz RF Wireless Laser Mouse Designer’s Kit,” www.avagotech.com diakses pada 12 November 2018. M. Kavakli dan J. R Thorne, “A Usability Study of Input Devices on Measuring User Performance in Computer Games,” Proceedings of First International Conference on Information Technology and Application, pp. 291-295. http://dx.doi.org/10.28989/angkasa.v14i1.1082 Refbacks There are currently no refbacks.
Eko Poerwanto, Kris Hariyanto
Angkasa: Jurnal Ilmiah Bidang Teknologi, Volume 14, pp 55-64; https://doi.org/10.28989/angkasa.v14i1.1217

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One way to isolate essential oils from essential oil-producing plants is by distillation. Distillation is the separation of components in the form of a liquid consisting of two or more kinds of mixtures based on differences in boiling points. The process is carried out on essential oils that are not soluble in water. The distillation process that has been used so far is by using steam and water, because the equipment construction is cheaper and simpler. However, steam and water distillation has a disadvantage, namely that it requires more water vapor. This will result in a certain amount of steam condensing in the plant tissue so that the material will get wetter so that it will increase the use of fuel and will reduce the productivity of the distillation process. To overcome this, it is necessary to strive for a more effective distillation system.This research was conducted with the aim of increasing the combustion efficiency of the essential plant distillation process, namely citronella, so that it is expected to increase the productivity of the distillation. This research was carried out by changing the distillation system using the cohobation system. Boyolali.The results showed that the efficiency of the kohobasi furnace distillation system was 0.85% higher than the steam distillation system, these results were in line with the productivity level of the citronella oil distillation production process, so for the work program of the Guli Village Government it was recommended to use the kohobasi furnace distillation system
Aris Prasetiyo, Nur Aini Masruroh, Kusnanto Kusnanto
Angkasa: Jurnal Ilmiah Bidang Teknologi, Volume 14, pp 9-22; https://doi.org/10.28989/angkasa.v14i1.1121

Abstract:
Before carrying out drilling, the rig and its supporting fleet must pass through the swamp area in the Mahakam Block. In order to pass through the area, dredging activities are needed. Mistakes in choosing a dredging vendor will result in delays that incur huge costs. This study aims to determine the right criteria for selecting vendors using the Analytical Hierarchy Process (AHP). By using the open system AHP through a rating approach, any number of vendors will be able to be assessed. The results of the study are the weight of the criteria and the intensity of the rating: the price criterion (weight 0.36) with 3 rating intensities (weight according to the estimate: 1, above the estimate: 0.794, below the estimate: 0.630), the HSE Index criteria (weight 0.263) with 5 rating intensities (excellent weight: 1, good: 0.626, adequate: 0.292, fair: 0.158, poor: 0.138), criteria for production facilities and capacity (weight 0.176) with 3 rating intensities (weight above target: 1, on target: 0.437, below target 0.191), quality criteria (weight 0.113) with 4 rating intensities (very good weight: 1, good: 0.516, adequate: 0.191, poor: 0.135) and financial condition criteria (weight 0.089) with 3 rating intensities (healthy weight: 1, unhealthy: 0.252, bankrupt: 0.159). Keywords Analytical Hierarchy Process; Dredging; Vendor selection Full Text: PDF (Bahasa Indonesia) References Peraturan Menteri Perhubungan No 125 Tahun 2018 tentang Pengerukan dan Reklamasi. R. N. Bray, A. D. Bates, and J. M. Land, “Dredging: A Handbook for Engineers.” KDJPL.. Dumping & dredging area. Balikpapan, 2020 R. W. Saaty, “The analytic hierarchy process-what it is and how it is used,” Math. Model., vol. 9, no. 3–5, pp. 161–176, 1987, doi: 10.1016/0270-0255(87)90473-8. A. F. Firdaus, S. Madelan, and A. B. Saluy, “Supplier / Partnership Selection System Analysis Based on Analytic Hierarchy Method Process in Oil and Gas Drilling Project (Case Study: PT. KMI),” Int. J. Innov. Sci. Res. Technol., vol. 6, no. 3, pp. 403–411, ISSN 2456-2165, 2021. K. A. All, J. I. Manajemen, and V. Vii, “Kurniawan At All 252 – 266 MIX: Jurnal Ilmiah Manajemen, Volume VII, No. 2, Juni 2017,” vol. VII, no. 2, pp. 252–266, 2017. J. K. W. Wong and H. Li, “Application of the analytic hierarchy process (AHP) in multi-criteria analysis of the selection of intelligent building systems,” Build. Environ., vol. 43, no. 1, pp. 108–125, 2008, doi: 10.1016/j.buildenv.2006.11.019. C. A. Weber, J. R. Current, and W. C. Benton, “Vendor selection criteria and methods,” European Journal of Operational Research, vol. 50, no. 1. North-Holland, pp. 2–18, Jan. 07, 1991, doi: 10.1016/0377-2217(91)90033-R. U. Sekaran and R. J. Bougie, Research methods for business: A skill building approach, 7th ed. John Wiley & Sons, 2016. E. Darmanto, N. Latifah, and N. Susanti, “Penerapan Metode Ahp (Analythic Hierarchy Process) Untuk Menentukan Kualitas Gula Tumbu,” Simetris J. Tek. Mesin, Elektro dan Ilmu Komput., vol. 5, no. 1, p. 75, 2014, doi: 10.24176/simet.v5i1.139. T. L. Saaty and L. G. Vargas, Models, Methods, Concepts & Applications of the Analytic Hierarchy Process, vol. 175. Boston, MA: Springer US, 2012. doi: 10.1007/978-1-4614-3597-6. C. A. Weber, J. R. Current, and W. C. Benton, “Vendor selection criteria and methods,” European Journal of Operational Research, vol. 50, no. 1. North-Holland, pp. 2–18, Jan. 07, 1991, doi: 10.1016/0377-2217(91)90033-R. http://dx.doi.org/10.28989/angkasa.v14i1.1121 Refbacks There are currently no refbacks.
Lado Rislya Prakasa, Djarot Wahju Santoso
Angkasa: Jurnal Ilmiah Bidang Teknologi, Volume 13; https://doi.org/10.28989/angkasa.v13i2.1071

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Untuk mengetahui kekuatan struktur doubler dalam menahan terjadinya kegagalan akibat retakan yang disebabkan oleh cyclic loading, diperlukan suatu analisis tersendiri yang tidak terdapat pada panduan Structural Repair Manual (SRM). Cyclic loading dapat mengurangi kekuatan skin doubler secara bertahap (fatigue) hingga mencapai kegagalan (fracture).Pada penelitian ini akan dilakukan analisis crack growth rate dan jumlah siklus pembebanan yang dibutuhkan untuk memunculkan retakan dengan panjang tertentu (fatigue cycle) terhadap struktur doubler fuselage skin pesawat Boeing 737-900 Extended Range dengan station number 360-380 di antara stringer 6L-7L pada setiap panjang retakan dan ketinggian terbang simulasi. Analisis dilakukan menggunakan pendekatan numerik dengan metode Modified Virtual Crack Closure Integral (MVCCI) untuk mendapatkan nilai Stress Intensity Factor (SIF) melalui software berbasis metode elemen hingga. Melalui nilai yang diperoleh dapat diketahui bahwa nilai crack growth rate dan fatigue cycle berbanding lurus terhadap variasi panjang retakan dan ketinggian terbang simulasi yang diberikan. Nilai crack growth rate paling rendah terjadi pada struktur doubler dengan panjang retakan 8,5 mm dan kondisi terbang 5000 feet yaitu sebesar 2,964 mm/cycle, dan nilai tertinggi sebesar 5,471 mm/cycle terjadi pada struktur doubler dengan panjang retakan 51 mm dan kondisi terbang 40000 feet. Sedangkan, nilai fatigue cycle paling rendah terjadi pada struktur doubler dengan panjang retakan 8,5 mm dan kondisi terbang 40000 feet yaitu sebesar 2,540 cycle, dan nilai tertinggi sebesar 5,470 cycle terjadi pada struktur doubler dengan panjang retakan 51 mm dan kondisi terbang 5000 feet. Keywords Crack growth rate; Fatigue cycle; Struktur doubler References J. Roesler, H. Harders, and M. Beaker, “Mechanical Behavior of Engineering Materials Metals, Ceramics, Polymers, and Components, Berlin: Springer Science & Business Media, 2007. Boeing, “Chapter 53 Fuselage”, Chicago: Boeing Structural Repair Manual, 2018. H. N. Firmansyah, “Estimasi Nilai Faktor Intensitas Tegangan (KI) Tipe Center Crack Dengan Metode Numerik”, Conference SENATIK STT Adisutjipto Yogyakarta, Vol. 2, Nov. 2016. H. N. Firmansyah, “Predicting Stress Intensity Factor (KI) Of Single Edge Crack Using Displacement Extrapolation Method”, Conference SENATIK STT Adisutjipto Yogyakarta, Vol. 4, Des. 2018. B. K. Venkatesha, K. P. Prashanth, T. K. Deepak,”Investigation of Fatigue Crack Growth Rate in Fuselage of Large Transport Aircraft using FEA Approach”, Global Journal of Researches in Engineering, Mechanical and Mechanics Engineering, Vol. 14, Jan. 2014. V. C. Raj, Aldo, Gowrishankar,”Study on the Fatigue Life Estimation of an Airframe Fuselage Window Cutout Panel”, International Journal for Research in Applied Science & Engineering Technology (IJRASET), Vol 6, Mei. 2018. N. V. Deepashri, M. Kalaiyapan,” Life extension of Structural Repairs – A Statistical Approach Towards Efficiency Improvement”, International Conference on Aerospace and Mechanical Engineering (AeroMech17), Vol 370, Mei. 2018. Kemendikbud,” Maintenance Practice”, 2014. A. B. Selan,” Analisis Damage Tolerance Dan Crack Growth Pada Alumunium 2024-T3 Dan Alumunium 7075-T7351 Menggunakan Perangkat Lunak Matlab”, Departemen Teknik Dirgantara Sekolah Tinggi Teknologi Adisutjipto, 2018. D. Roylance,” Introduction to Fracture Mechanics”, Departement of Materials Science and Engineering MIT, Juni. 2001. M. Milkota, S. Staib, S. Schmauder, Ž. Božić,”Numerical determination of Paris law constants for carbon steel using a two-scale model”, 6th International Conference on Fracture Fatigue and Wear, IOP Conf. Series: Journal of Physics: Conf. Series 843, Sep. 2017. http://dx.doi.org/10.28989/angkasa.v13i2.1071 Refbacks There are currently no refbacks.
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