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Angkasa: Jurnal Ilmiah Bidang Teknologi
Published by Institut Teknologi Dirgantara Adisutjipto
ISSN : 20859503     EISSN : 25811355     DOI : 10.28989/angkasa
Core Subject : Science,
Computer Science & IT
Arjuna Subject : -
Articles 350 Documents
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Geoelectrical resistivity survey to determine sliding surface of landslides prone area case study in Ponjong subdistrict Gunung Kidul regency Indonesia Al Hussein Flowers Rizqi; Oky Sugarbo; Mayang Pitaloka
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 14, No 1 (2022): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1401.981 KB) | DOI: 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. 
Peningkatan Efisiensi Penggunaan Bahan Bakar Terhadap Produktivitas Hasil Proses Penyulingan Sereh Wangi Menggunakan Sistem Kohabasi Untuk Mendukung Kegiatan Agro-Industri Eko Poerwanto; Kris Hariyanto
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 14, No 1 (2022): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1078.249 KB) | DOI: 10.28989/angkasa.v14i1.1217

Abstract

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
Design of Difable Care (DC) mouse as the accessibility of people with hand disabilities Devita Ayuni Kusumaningsih; Akhmad Adham Nur Husaen; Muhammad Zhafran Haidar Muttaqin; Dawi Karomati Baroroh
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 14, No 1 (2022): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (659.249 KB) | DOI: 10.28989/angkasa.v14i1.1082

Abstract

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.
Manufacturing process and experimental study of a small scale archimedes hydro powerplant by varying the number of blade Abdillah, Helmi Fauzan; Dinaryanto, Okto; Jalaali, Bahrul
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 14, No 1 (2022): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1461.074 KB) | DOI: 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.
Pemilihan vendor untuk kegiatan Dredging di blok Mahakam Kalimantan Timur menggunakan metode Analytical Hierarchy Process Aris Prasetiyo; Nur Aini Masruroh; Kusnanto Kusnanto
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 14, No 1 (2022): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1292.768 KB) | DOI: 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). 
Numerical study of pressure drops and flow characteristic in high temperature air-water stratified flow using the AIAD model Eli Kumolosari; Bahrul Jalaali
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 14, No 2 (2022): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/angkasa.v14i2.1348

Abstract

In geothermal power plant systems, two-phase flow measurement is very important for the management and control of different processes. Two of the important parameters in two-phase flow are the flow regime (flow pattern) and pressure drop. In this study, high temperature air-water pressure drop and flow regime were investigated numerically, as a basic study of two-phase phenomena in geothermal power plant, using AIAD model. The vapor and water superficial velocities were ranged at 3.9 – 6.6 m/s and 0.013-0.022 m/s, respectively. The computational domain was adjusted on a horizontal pipe with 255mm in diameter and 8000mm in length while the temperature and inlet pressure condition were set to 433K and 6bar. The simulation results showed a good agreement on predicting flow regime compared with the flow regimes that obtained experimentally by previous work whereby stratified and wavy flow were clearly observed. The results are beneficial to enhance the understanding of flow characteristics regarding geothermal wells and their potential power which is important to the investigation on geothermal industry
Teknologi Augmented Reality untuk instalasi kelistrikan gedung Ari Sugiharto; Ikrima Alfi; Suwirno Suwirno
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 14, No 2 (2022): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/angkasa.v14i2.1220

Abstract

The electrical installation stage in the process of building construction have risks to work safety and the operation of the results if the work is not following the General Electrical Installation Requirements (PUIL). This study aims to apply the development of Augmented Reality (AR) technology to provide convenience in the process of working on the electrical installation. Development of AR-based applications by utilizing android-based mobile phone devices which are now commonly owned by the public. The research was conducted by analyzing the electrical installation system in accordance with PUIL standards and its application in an easy-to-understand format, then processing electrical component data as input for 3D objects. Furthermore, the technical data of the building is used to produce AR applications that can be applied to the location of electrical installation work. The application that was built was successfully implemented on an Android-based cellular phone device. The rear camera is used to detect markers as triggers for the emergence of 3D objects in the form of electrical networks and electrical installation components. There are also info features and 3D object animations, as well as video calls as an alternative option for assistance if there are problems during electrical installation work.
Characterization of ion-exchanged zeolites with lithium for Pressure Swing Adsorption (PSA) applications Nidya Jullanar Salman; Dhimas Satria; Damar Abi Ramadani; Teguh Kurniawan
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 14, No 2 (2022): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/angkasa.v14i2.1349

Abstract

The method used for the Ion Exchange process to determine the characteristics of the zeolite is refluxing the zeolite using a 4 M LiCl solution for 36 hours at a temperature of 72℃ and calcined at a temperature of 400℃ for 10 hours. XRF characterization results showed natural zeolite Lampung had moderate Si/Al levels with 8.97 and 8.79 for those given lithium, while zeolite 13X had low Si/Al levels with 4.31 and 3.77 for those given lithium. The XRD results show that Lampung's natural zeolite is clinoptilolite and 13X zeolite is NaX. The results of the adsorption test using the PSA tool, namely for natural zeolite Lampung, the highest oxygen value was 21.3% and that was given lithium at 21.2% for the single bed and double bed types. For zeolite 13X, the highest oxygen value was 22% and that given lithium was 24% for the single bed type, and for the double bed type the highest oxygen value was 21.8% and those given lithium were 24.9%.
Endurance estimation in hovering flight based on battery power requested on quadcopter UAV Richard Octonius; Neno Ruseno
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 14, No 2 (2022): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/angkasa.v14i2.1226

Abstract

In this era, Unmanned Air Vehicle (UAV) application is growing. However, there are still weaknesses in using UAVs to carry out certain missions. One of the major problems is the energy and power required to use the UAV which impacts the endurance of a UAV can hover. This study focuses on calculating the endurance and finding which configuration will produce the optimal endurance. It starts by calculating the thrust of a propeller using blade element theory which ends in calculating endurance. Using four different types of propellers, an integral formulation was devised for a constant–power battery discharge process to predict the hovering time. The result shows that APC 1238 combined with battery 6S will produce the longest endurance. The methodology is applicable for a custom quadcopter UAV.
Pengembangan Sistem Informasi Pemantauan Gizi Remaja Berbasis Antropometri (SIPSAE) berbasis mobile dan web bagi remaja SMP Ery Setiyawan Jullev Atmadji; Zora Olivia; Nita Maria Rosiana; Arinda Lironika Suryana
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 14, No 2 (2022): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/angkasa.v14i2.1379

Abstract

Masalah gizi remaja muncul akibat perilaku gizi yang salah yaitu ketidakseimbangan konsumsi gizi dengan kecukupan gizi yang dianjurkan, untuk menghitung nilai kecukupan gizi terdapat metode yang umum digunakan yaitu Antropometri. umumnya terdapat indeks antropometri yang digunakan, yaitu berat badan per umur (BB/BB), tinggi badan per umur (TB/U), dan berat badan per tinggi badan (BB/TB) namun standar ini sulit diterapkan tanpa bantuan ahli yang biasa. melakukan pengukuran. Dengan pemanfaatan teknologi informasi dapat digunakan sebagai alat dalam pemantauan status gizi remaja namun tetap dalam pengawasan ahli, pendekatan web service memungkinkan aplikasi mengirimkan data pengukuran dan berita yang ada di aplikasi kepada pengguna secara real time, sehingga memudahkan pengguna dalam mengolah transaksi data.

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