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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 6 Documents
 1 
Search results for , issue "Vol 25, No 2 (2022): Volume 25 Edisi 2 Tahun 2022" : 6 Documents clear
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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