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INDONESIA
Jurnal Ilmiah Giga
Published by Universitas Nasional Jakarta
ISSN : 14108682     EISSN : 26219239     DOI : -
Core Subject : Education,
Education
GIGA Scientific Journals is a scientific publication from research and literature study which are conducted by undergraduate, graduate, doctoral student, researchers and lecturers to be published widely and can be utilized as widely as possible for the advancement of science and technology at domestic and aroud the world.
Arjuna Subject : -
Articles 145 Documents
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Load Flow Analysis Capacitor Bank dengan Metode Konpensasi Individual dan Konpensasi Global Ruliyanta Ruliyanta; R.A. Suwodjo Kusumoputro; Idris Kusuma; Adhyarta Keraf
Jurnal Ilmiah Giga Vol 25, No 1 (2022): Volume 25 Edisi 1 Tahun 2022
Publisher : Universitas Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47313/jig.v25i1.1591

Abstract

Abstract. Large buildings use lots of electrical equipment. The equipment includes air conditioning systems, building transportation, pumps, and others. One of the problems often encountered is the emergence of a decrease in power factor due to inductive loads. These induction machines cause this inductive load. One way to overcome this problem, Capacitor Bank is needed. The building that we observed is a building that has been operating for more than 20 years and has undergone a Single Line Diagram (SLD) change, where the capacitor bank does not work properly so the power factor is close to 0.85. This study rearranges the SLD according to the latest electrical loads in the building. The new SLD results are simulated using the Load Flow Analysis method with ETAP software, to achieve a quality factor of 0.99. In the Individual Compensation Method, it produces a savings of 13.9 kW, and this will result in a return on investment in the 40th month, and in the 2nd method, we use the Global Compensation Method which results in an improvement of 9.7 kW and a return on investment in the 57th month. Abstrak. Pada gedung-gedung besar menggunakan peralatan listrik. Peralatan tersebut seperti sistem tata udara, transportasi gedung, pompa dan lain-lain. Salah satu permasalahan yang sering dijumpai adalah timbulnya penurunan faktor daya akibat beban induktif. Beban induktif ini disebabkan oleh mesin-mesin induksi. Salah satu cara untuk mengatasinya adalah dengan menambahkan Capacitor Bank. Gedung yang kami teliti adalah gedung yang sudah beroperasi lebih dari 20 tahun dan sudah mengalami perubahan Single Line Diagram (SLD), selain itu capasitor bank tidak bekerja dengan baik sehingga faktor daya mendekati 0.85. Penelitian ini menyusun ulang SLD sesuai dengan beban listrik terbaru dalam gedung. Hasil SLD yang baru kami simulasikan dengan metode Load Flow Analysis dengan perangkat lunak ETAP, untuk mencapai faktor kualitas sebesar 0,99. Pada Individual Compensation Method menghasilkan penghematan sebesar 13.9 kW dan ini akan menghasilkan return of investment pada bulan ke-40 dan pada metode ke-2 kami pakai Global Compencsation Method yang menghasilkan perbaikan 9.7 kW dan return of investment di bulan ke-57.
Perancangan Sistem Komunikasi Kabel Laut (SKKL) Fiber Optik Link Surabaya-Bawean Endang Retno Nugroho; Rianto Nugroho
Jurnal Ilmiah Giga Vol 25, No 1 (2022): Volume 25 Edisi 1 Tahun 2022
Publisher : Universitas Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47313/jig.v25i1.1663

Abstract

Abstract. Internet network is an important requirement in the digital era. Indonesia is listed as the country with the highest data traffic growth in the world in 2016. To meet the needs of this data traffic, network access is needed. Indonesia has a geography that mostly covers the ocean. The islands lined up from Sabang to Merauke up to tens of thousands. This large number of islands is a problem in building communication infrastructure. Bawean Island is one of the islands in Indonesia with an area of 197 km2 with a population of more than 100,000 people in 2021. The pre-existing communication access is communication with VSAT using Satellite and Radio Wave Communication. Both types of communication have limitations in bandwidth capacity. In this research, it is proposed to design a Marine Cable Communication System (SKKL) for data access on Bawean Island. Data traffic is sent via optical fibre from the city of Surabaya to the island of Bawean which is 235 km away. In this design, we use a single-mode G.655 cable type and 5 optical amplifiers of the EDFA type. The results of the design show that the power link budget is -9.525 dBm, SNR 25.35 dB, Q-factor 9.26, and BER 1.009×10^-20. Abstrak. Jaringan internet merupakan suatu kebutuhan penting di era digital. Indonesia tercatat sebagai negara dengan pertumbuhan trafik data tertinggi di dunia pada 2016. Untuk pemenuhan kebutuhan trafik data ini dibutuhkan akses jaringan. Indonesia memiliki geografis yang sebagian besar meliputi lautan. Pulau-pulau berjajar dari Sabang sampai Merauke jumlahnya hingga puluhan ribu. Jumlah pulau yang banyak inilah yang menjadi permasalahan dalam membangun infrastruktur komunikasi. Pulau Bawean adalah salah satu pulau di Indonesia dengan luas 197 km2 dengan penduduk lebih dari 100.000 jiwa pada tahun 2021. Akses komunikasi yang sudah ada sebelumnya adalah komunikasi dengan VSAT yang memanfaatkan Satelit dan Komunikasi Gelombang Radio. Kedua jenis komunikasi ini memiliki keterbatasan dalam kapasitas bandwidth. Dalam penelitian ini diusulkan perancangan Sistem Komunikasi Kabel Laut (SKKL) untuk akses data pulau Bawean. Trafik data dikirimkan melalui serat optik dari kota Surabaya menuju pulau Bawean yang berjarak 235 km. Dalam perancangan ini menggunakan tipe kabel singlemode G.655 dan 5 buah optikal amplifier jenis EDFA. Hasil perancangan menunjukan besarnya power link budget -9.525 dBm, SNR 25.35 dB, Q-factor 9.26, dan BER 1,009×10^-20.
Pengaruh Parameter Cetak Pada Nilai Kekerasan Serta Akurasi Dimensi Material Thermoplastic Elastomer (TPE) Hasil 3D Printing Juan Pratama; Adam Zuyyinal Adib
Jurnal Ilmiah Giga Vol 25, No 1 (2022): Volume 25 Edisi 1 Tahun 2022
Publisher : Universitas Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47313/jig.v25i1.1712

Abstract

Abstract. The ability of Fused Deposition Modeling (FDM) 3D Printing technology to create complex objects makes this technology increasingly widely used. Apart from the advantages of FDM technology, the low dimensional accuracy and mechanical properties of FDM printed parts are one of the drawbacks of this process. In addition, developments in the use of elastic materials to create flexible products make the process of this technology requires special attention. This study focused on knowing the effect of process parameters, namely temperature and build orientation on dimensional accuracy and the value of hardness (Shore D Hardness) of the Thermoplastic Elastomer (TPE) material produced by FDM 3D Printing. The hardness test method refers to the ASTM D2240 standard for measuring Shore D hardness, while the dimensional accuracy is measured using a vernier caliper. The results showed that the temperature and build orientation had an influence on the accuracy and hardness values. The properties of TPE have different results from PLA which is completely shrunk. However, the porosity value does not have a significant effect on hardness, but the number of layers. The research results have been presented both in tables and graphically, and are briefly discussed in this study. Abstrak. Kemampuan dari teknologi Fused Deposition Modeling (FDM) 3D Printing untuk membuat objek yang kompleks menjadikan teknologi ini semakin banyak digunakan secara luas. Terlepas dari kelebihan teknologi FDM, rendahnya akurasi dimensi serta sifat mekanis dari hasil cetak FDM menjadi salah satu kekurangan dari proses ini. Selain itu, perkembangan pada penggunaan material elastis untuk menciptakan produk yang fleksibel menjadikan proses dari teknologi ini membutuhkan perhatian khusus. Penelitian ini difokuskan untuk mengetahui pengaruh parameter proses yaitu suhu dan orientasi build terhadap akurasi dimensi serta nilai kekerasan (Shore D Hardness) dari material Thermoplastic Elastomer (TPE) hasil cetak FDM 3D Printing. Metode pengujian kekerasan mengacu pada standar ASTM D2240 untuk pengukuran Shore D hardness, sedangkan akurasi dimensi diukur menggunakan vernier caliper. Hasil penelitian menunjukkan bahwa suhu serta orientasi build memiliki pengaruh terhadap nilai akurasi maupun kekerasan. Sifat TPE memiliki hasil yang berbeda dengan PLA yang sepenuhnya mengalami penyusutan. Meskipun demikian, nilai porositas tidak memiliki pengaruh siginifikan terhadap kekerasan, tetapi jumlah lapisan lah yang berpengaruh terhadap kekerasan. Hasil penelitian telah ditampilkan baik dengan tabel maupun secara grafis, dan dibahas secara singkat pada penelitian ini.
Perbandingan Biomassa Pertanian sebagai Energi Terbarukan Briket Arang Rian Christian Sondakh; Hayatudin Hayatudin
Jurnal Ilmiah Giga Vol 25, No 1 (2022): Volume 25 Edisi 1 Tahun 2022
Publisher : Universitas Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47313/jig.v25i1.1720

Abstract

Abstract. Briquettes are renewable energy sourced from agricultural waste and used as a household fuel. The availability of farm or plantation waste is a good impetus for developing environmentally friendly briquette fuels. This study aims to determine the characteristics of briquettes from various types of agricultural biomass. The research was carried out at the Laboratory of the Faculty of Agriculture, Madako Tolitoli University, from May to June 2020. This study used a completely randomized design (CRD) with one factor: the type of briquettes consisting of 4 levels of treatment: coconut shell, coconut fiber, rice husk, and corn cobs. Each treatment was repeated three times so that there were 12 research units. The results showed that various types of biomass produced the characteristics of briquettes with better quality, which can be seen from the research parameters of moisture content, burning time, combustion speed, and density. Coconut shell biomass has more noticeable results to the moisture content obtained is 1.76%, burning time is 215.26 minutes, combustion speed is 0.005 gr/second, and density is 0.57 gr/cc. Abstrak. Briket adalah sumber energi terbarukan yang bersumber dari limbah pertanian dan digunakan sebagai bahan bakar rumah tangga. Ketersedian limbah pertanian atau perkebunan menjadi dorongan yang baik dalam pengembangan bahan bakar briket ramah lingkungan. Penelitian ini bertujuan untuk mengetahui karakteristik briket dari berbagai jenis biomassa pertanian. Penelitian ini dilaksanakan di Laboratorium Fakultas Pertanian Universitas Madako Tolitoli, dilaksanakan pada bulan Mei sampai dengan Juni 2020. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) satu faktor yaitu jenis briket yang terdiri dari 4 taraf perlakuan yaitu : tempurung kelapa, sabut kelapa, sekam padi, dan tongkol jagung. Setiap perlakuan diulang sebanyak 3 kali sehingga terdapat 12 unit penelitian. Hasil penelitian menunjukkan bahwa berbagai jenis biomassa menghasilkan karakteristik briket dengan kualitas lebih baik dapat dilihat dari parameter penelitian kadar air, lama pembakaran, kecepatan pembakaran, dan densitas. Biomassa tempurung kelapa memiliki hasil lebih menonjol dari kadar air yang didapatkan adalah 1.76 %, lama pembakaran 215.26 menit, kecepatan pembakaran 0.005 gr/detik, dan densitas 0.57 gr/cc.
Evaluasi Kualitas Citra Mamografi Metode Automatic Exposure Control (AEC) Menggunakan Normalized Anisotropic Quality Index (NAQI) Ririn Septya Anggraini; Ni Larasati Kartika Sari; Idris Kusuma; Febria Anita
Jurnal Ilmiah Giga Vol 25, No 2 (2022): Volume 25 Edisi 2 Tahun 2022
Publisher : Universitas Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47313/jig.v25i2.1651

Abstract

Mammography image is expected to have high image resolution quality so that the image is able to show microcalcifications as a sign of a malignant breast tumor with a size ranging from 0.1 mm. Automatic Exposure Control (AEC) is an image acquisition mode in mammography that is designed to strike a balance between patient dose and image quality by accommodating differences in breast size. This study aims to obtain the results of measuring mammographic image quality using Normalized Anisotropic Quality Index (NAQI), assessing the performance of AEC against variations in Compressed Breast Thicknes (CBT), density and Average Glandular Dose (AGD). This study using 20 mammographic images in AEC mode, Cranio Caudal (CC) projections. The data in the forms of CBT, breast density and AGD were also taken. In this study, the CBT range was 45-81 mm, the density range was 14-18%, the AGD range was 1.25-2.26 mGy with the patient's age ranged from 39-67 years and the compression pressure ranged from 20.0169-157.9111 N. Then the images are grouped based on CBT, density and AGD, to get the NAQI values. The results of NAQI values are e ues sults o(0.111-2). The highest NAQI value obtained on CBT images of 61 mm, density 14.64% and AGD 1.41 mGy.
Identifikasi Lapisan Akuifer Menggunakan Resistivity Method 1-dimensi di Dusun Karang Bayan, Parampuan, Kabupaten Lombok Barat Melinda Dwi Erintina; Aji Syailendra Ubaidillah; Andi Faesal; Agus Kurniawan
Jurnal Ilmiah Giga Vol 25, No 2 (2022): Volume 25 Edisi 2 Tahun 2022
Publisher : Universitas Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47313/jig.v25i2.1932

Abstract

This study aims to identify aquifer layer at Karang Bayan Village, Parampuan, Lombok Barat District. Aquifer layer is the layer that can store and bring the water because it has high rock porosity. The method used in this study was resistivity method with Schlumberger Configuration. This study used 2 measurement points, namely point 1 and point 2. Each of points has the value of (AB/2) = 300meter. Data were analysed and processed by using software Progress resulting the variation of resistivity value vertically. The result at point 1 shows the aquifer layer is at depth 86.30-128 meters and identified as sandstone with resistivity value 56.50 Ωm. The result at point 2 shows the aquifer layer is at depth 86-128 meter and identified as sandstone with resistivity value 20.28 Ωm.
Perancangan Antena Pesawat Tanpa Awak Menggunakan ANSYS High-Frequency Structure Simulator Ruliyanta Ruliyanta; Muhammad Fahrurozi; Herry Satria Utama
Jurnal Ilmiah Giga Vol 25, No 2 (2022): Volume 25 Edisi 2 Tahun 2022
Publisher : Universitas Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47313/jig.v25i2.1914

Abstract

Using crewless aircraft or Unmanned Aerial vehicles (UAV) is rife in the civil and military world. The problem that often occurs is that the UAV has disconnected from the control center. One of the reasons was that the aircraft was operating outside the radio control center's range. This study aims to design a control antenna with a higher gain than the previous research antenna, which is used as a reference. The method we used is designing a 2×8 circular array microstrip antenna using the Ansys high-frequency structure simulator (HFSS) software. The result gives a return loss value of -30.25 dB, a voltage standing wave ratio (VSWR) of 1.11, and a bandwidth of 512,1 MHz. The amount of gain is 12.94 dB. The magnitude of the reflection coefficient of the designed antenna is 0.017. This value means that the amount of power reflected by the designed antenna is 1.7%, or the antenna is capable of capturing signals of up to 98.3%.
Evaluasi Sistem Proteksi dan Koordinasi Relai Arus lebih Gedung Mall XYZ Menggunakan ETAP 19.0.1 Fuad Djauhari; Idris Kusuma; Endang Retno Nugroho
Jurnal Ilmiah Giga Vol 25, No 2 (2022): Volume 25 Edisi 2 Tahun 2022
Publisher : Universitas Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47313/jig.v25i2.1915

Abstract

Large buildings require optimal electrical protection. Short-circuit events are the most common occurrences. If there is a short-circuit fault on one of the feeders, the circuit breaker whose position is upstream from the fault center must work ahead of the circuit breaker whose position is upstream from the short-circuit fault center. The problem that occurs in the XYZ Mall Building is the opposite. When there is a short circuit current, it will cut off the main connector. As a result, some of the building's electricity will also go out. The purpose of this study is to regulate the coordination of relay protection repeatedly in this building. The study will evaluate the existing electrical Single Line Diagram of the XYZ Mall Building and perform simulations with the help of ETAP 19.0.1 software. The simulation results get the value of the protection system that has been adjusted where the curves of each relay do not intersect with each other so that the coordination of each relay is safe, with the standard time delay setting of 0.2 to 0.4 seconds. To overcome the problem in the XYZ Mall building, the relay that is not suitable must be set manually according to the simulation results to prevent tripping some of the buildings in the event of a short circuit fault.
Analisis Risiko (K3) Metode Hazard Identification Risk Assesment And Risk Control (HIRARC) di Departemen Laboratorium PT. ABC Moh. Fikri Pratama; Elly Ismiyah; Akhmad Wasiur Rizqi
Jurnal Ilmiah Giga Vol 25, No 2 (2022): Volume 25 Edisi 2 Tahun 2022
Publisher : Universitas Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47313/jig.v25i2.1922

Abstract

PT. ABC is a company that produces cooking oil and margarine whose products are well known throughout Indonesia, located in the city of Gresik, East Java. The main basic ingredient in manufacture of cooking oil and margarine is CPO (crude palm oil) which will be proceed at refinery and fraction stages. During the production process, quality control is carried out in order to get maximum results from raw to finished goods in Laboratory. In laboratory department, work accidents often occur, whether are low, medium or very hight. There are many potential hazards and risks due to direct contact with chemicals such as HCL, H2SO4 and Ammonium. To overcome this, a study was conducted using the HIRARC (Hazard Identification Risk Assessment And Risk Control) and based on (OHSAS) Occupational Health and Safety Assessment Series 18001:2007. The results of the HIRARC method show there are two extreme risk levels, two high levels, two low levels, and three medium levels. Controlling risks are in the form of eliminating and substituting points relevant to laboratory condition.
Pengaruh Penggunaan Pelat Elektroda Tekstur terhadap laju Produksi gas pada Generator HHO Asmawi Asmawi; MUHD. Ridzuan bin Mansor; Noreffendy Tamaldin; Viktor Vekky Ronald Repi; Ajat Sudrajat
Jurnal Ilmiah Giga Vol 25, No 2 (2022): Volume 25 Edisi 2 Tahun 2022
Publisher : Universitas Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47313/jig.v25i2.1974

Abstract

SS316L iron plate is a material that is often used in construction on machinery. In this study, 6 sheets of SS316L plates as electrode plates measuring 100 mm × 100 mm were assembled into a spacer shape arranged parallel to the distance of 2 mm. The SS316L electrode plate consists of two types, namely the original electrode plate or flat plate and the electrode plate through a treatment process where the surface is made of lines (texture). Both flat and textured electrode plate is formed into a spacer which then inserted to the HHO generator as the main component in the water electrolysis process. Measurements and calibrations are performed on each HHO generator with flat electrode plates and textured electrode plates with KOH catalyst 10 grams, 20 grams and 30 grams. The results of the calibration of the two types of HHO generators show that the HHO generator with texture plates is better than the flat plate with an average value of 1.03 L/minute.

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