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Irza Sukmana
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Journal of Engineering and Scientific Research (JESR)
Published by Universitas Lampung
ISSN : 26850338     EISSN : 26851695     DOI : https://doi.org/10.23960/jesr.v4i1.78
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Engineering Industrial & Manufacturing Engineering
The focus and scopes of JESR is on but not limited to Mechanical Engineering and Material Sciences, Chemical and Environmental, Industrial and Manufacturing Engineering, Computer and Information Technology, Electrical and Telecommunication, Civil and Geodetic Engineering, Architecture and Urban Planning, Geophysical Science and Engineering, and other multidisciplinary research. The main criteria for publication are including the originality, scientific quality and interest to the aim and focus. JESR publishes twice a year for June and December editions. We welcome for publication collaborations with organizer of International Seminars, Conferences and Symposiums around the world. We are encouraging authors to submit their manuscript through our online system.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 141 Documents
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Analysis of Hardness Test and Microstructure Test of R.54 Type Railway Rail with Variations in Heat Treatment Cooling Media Oktavia, Amelia; Tabitha, Adinda Kanaya; Drajat, Bambang; Pujiyulianto, Eko
Journal of Engineering and Scientific Research Vol. 7 No. 2 (2025)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jesr.v7i2.175

Abstract

Rail steel R.54 is a steel that is included in high carbon steel. Rail steel R.54 has a carbon element of 0.60-0.80% allowing the hardening process to be carried out with appropriate heat treatment . This type of research is an experimental laboratory study. The study aims to determine the effect of variations in cooling media on the observation of microstructure and hardness values in the hardening process of rail steel R.54. The Vickers method with a load of 500 gf is one of the important aspects in hardness testing. The results showed that the hardness value without heat treatment was 383.93 HV and the hardness value after heat treatment with three variations of cooling media, namely soapy water of 669.13 HV, 35% table salt (NaCl) of 689.14 HV, and new oil of 835.50 HV. The three cooling media can be concluded that the highest level of steel hardness is achieved in specimens that are hardened and cooled with new oil cooling media. The viscosity of new oil affects the hardness level of R-54 rail steel. The hardness level of R-54 rail steel will increase along with the increasing viscosity of the oil that is inserted into the cooling medium of R-54 rail steel after the quenching process. The results of observations of the microstructure of R-54 rail steel samples show that there is a phase change without heat treatment that is formed is ferrite and pearlite to form ferrite , austenite and martensite phases due to the heating process of austenite which is cooled rapidly in the cooling medium.
Characteristics of silica in mountain area tapa and sorrounding areas of Tulang Bawang Regency Lampung Province Rahmadi, Rahmadi; Utama, Hari Wiki; Deliana, Anggi
Journal of Engineering and Scientific Research Vol. 7 No. 2 (2025)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jesr.v7i2.204

Abstract

An Analysis of Way Halim Community Preparedness Post-Flood Disaster Perspective on The Implementation Of Disaster Mitigation Management: 24 February 2024 Andien, Andien; Zahiya, Asda Arwa; Mulyasari, Rahmi; Haerudin, Nandi
Journal of Engineering and Scientific Research Vol. 7 No. 2 (2025)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jesr.v7i2.205

Abstract

Currently, the city of Bandar Lampung is facing a quite serious problem, namely the Flood Disaster which hit on February 24, 2024. Bandar Lampung has a diverse topography, ranging from lowlands, and beaches, to hilly areas with a height of 0-500 meters above sea level. Almost every year Bandar Lampung experiences the same problem, namely flooding in various sub-districts, one of which is the Way Halim sub-district. Floods are water that overflows and cannot be accommodated by rivers or absorbed by water catchment areas. Floods are also a disaster that can disrupt community activities. Bandar Lampung has a relatively high risk of flood disasters. Therefore, efforts need to be made to overcome the flood disaster. This research aims to analyze the preparedness of the community in the Way Halim subdistrict, Bandar Lampung after the flood disaster. This research uses an approach to community perceptions regarding preparedness in implementing disaster mitigation management. Preparedness in facing flood disasters can help communities plan actions that can be taken when floods strike. Community in Way Halim sub-district is moderately prepared for disasters. Lack of training andoutreach, results in a lack of focus during disasters. Proactive steps such as early warning systems, community education, and infrastructure development are crucial for enhancing preparedness in facing flood disasters.
Perceptual Study of User Comfort Regarding The Temperature Comfort of Learning Teaching Space in Building B of The Faculty Engineering, Architecture Department, Lampung University. Salsabila R, Syifa; Nugroho, Agung Cahyo
Journal of Engineering and Scientific Research Vol. 7 No. 2 (2025)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jesr.v7i2.212

Abstract

This study addresses the importance of thermal comfort in educational spaces, focusing on Building B at the Faculty of Engineering, Lampung University, where tropical climate conditions and suboptimal thermal control systems often result in uncomfortable room temperatures. The study aims to assess architecture students' perceptions of thermal comfort in classrooms and analyze the impact of temperature on their learning comfort. A quantitative research method was employed, collecting data through direct observation and questionnaires distributed to students. Results indicate that classroom temperatures do not meet optimal comfort standards, with most students feeling discomfort due to excessive heat, which affects concentration and productivity. The study concludes by recommending improvements in cooling and ventilation systems within classrooms to create a more conducive learning environment for architecture students in tropical regions.
Wireline Logging Data Interpretation on Coal Quality Value in The West Bangko Mining Area Millenia, Tasya; Alimuddin, Alimuddin; Zulkarnain, DA; Wibowo, Rahmat Catur
Journal of Engineering and Scientific Research Vol. 7 No. 2 (2025)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jesr.v7i2.220

Abstract

This study uses the well-logging method and the proximate values of laboratory test results at West Banko Pit 1 Mine, Lawang Kidul District, Muara Enim Regency, South Sumatra Province. The aim is to determine the relationship between the log density and coal quality. The proximate values used are the ash content, total moisture, and calorific value. This research used wellCAD software to interpret the coal seam in three wells: TM 01, TM 02, and TM 03. Meanwhile, a relationship between log density values and coal quality was identified using Microsoft Excel. From this research, it is found that there is a relationship between density and coal quality: the lower the density (g/cc), the better the coal quality.
Analysis of the Actviness Library Members Using K-Means Clustering Fedorova, Oxana; sari, rafika; Setiawati, Siti
Journal of Engineering and Scientific Research Vol. 7 No. 2 (2025)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jesr.v7i2.221

Abstract

University libraries play an important role in supporting academic activities, but the trend toward digital information access has made physical services less than optimal. At Bhayangkara University Jakarta Raya, data shows a difference between the frequency of visits and book borrowing, so user segmentation is needed. This study aims to group library members based on their level of activity using the K-Means Clustering algorithm, with variables of visit frequency and borrowing. The method used is quantitative with a data mining approach, utilizing secondary data from the library system for the period May–December 2024. The analysis process includes *data preparation*, modeling using *K-Means*, and evaluation using the *Davies-Bouldin Index (DBI)*. The results show that the optimal number of clusters is three, with a DBI value of 0.628, indicating that the cluster quality is quite good. The three clusters formed are: Active Borrowers (high visits and loans), Active Non-Borrowers (high visits, low loans), and Passive Members (low visits and loans). The uniqueness of this study lies in the simultaneous combination of two user behavior variables. This segmentation is useful as a basis for developing a performance portfolio and library service strategies that are more effective and tailored to user needs.
Flood Mitigation Strategies in Rajabasa Subdistrict, Bandar Lampung and Analysis of On-Site Flood Conditions Dewi, Helen Selvia; Hesti, Hesti; Mulyasari, Rahmi; Haerudin, Nandi; Karyanto, Karyanto
Journal of Engineering and Scientific Research Vol. 7 No. 2 (2025)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jesr.v7i2.222

Abstract

Flood disasters frequently occur in Rajabasa Village, Bandar Lampung, particularly during periods of intense rainfall. This study seeks to examine the primary causes of flooding and assess mitigation strategies that can be implemented using spatial planning and community engagement approaches. The research methods include spatial analysis, interviews with local residents, and hydrological modeling through HEC-RAS software. Findings reveal that the main causes of flooding are inadequate drainage infrastructure, land use change, and waste-induced waterway blockages. Therefore, enhancing drainage capacity, promoting riverbank vegetation, and fostering public awareness on environmental cleanliness are essential mitigation efforts.
Design And Implementation of A Solar-Driven Spy Security Motion Detector Abiodun, Salami Sulaimon; JoelOlasunkanmi, Oluwaseun; Mujeeb, Babatunde
Journal of Engineering and Scientific Research Vol. 7 No. 2 (2025)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jesr.v7i2.223

Abstract

This project designs and implements a solar-powered spy security system with motion detection capability. The system integrates a solar panel, charge controller, battery, PIR sensor, 555 timer IC, buzzer, WiFi module, and a spy camera. The solar panel recharges the battery, providing a sustainable power source. The PIR sensor detects motion, triggering the 555 timer IC to activate the buzzer and spy camera. The system captures images or records videos only when motion is detected, conserving energy and memory space. The spy camera connects to a smart device via WiFi, enabling remote viewing of captured footage. Testing demonstrated the system's effectiveness as a reliable and efficient security solution. This project addresses the limitations of traditional CCTV cameras, providing a more efficient and sustainable solution for home security. The design leverages principles of electrical and electronics engineering, including circuit design, electronics, and control systems. Future enhancements can include integrating Artificial Intelligence to improve security and reduce false alarms.
A Design and Experimental Investigation of a High-Performance X-Band Patch Array Antenna for Automotive Radar Applications Lasisi, Hammed Oyebamiji; Ogungbayi, Peter Ropo; Oluwaleke, Afolabi Abimbola
Journal of Engineering and Scientific Research Vol. 7 No. 2 (2025)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jesr.v7i2.224

Abstract

Radar technology has become increasingly important in automotive applications, particularly for car-speed detection and monitoring systems. The antenna plays a crucial role in determining the performance of these systems. This paper presents the design, simulation, and experimental investigation of a high-performance X-band patch array antenna for automotive radar applications. The antenna was fabricated and tested, and the experimental results validate the simulation results. The prototype antenna operates at a center frequency of 10 GHz and achieves a gain of 15.48 dB, directivity of 17.96 dBi, and |S11|of -18.85 dB. Its impedance bandwidth extends from 9.69 to 10.20 GHz, with a beam width of 10 degree and corresponding radiation efficiency is 86.17% at 10 GHz. The simulation and experimental results demonstrate excellent agreement, validating the antenna's performance for car-speed detection and monitoring radar systems. The results show that the designed patch array antenna is suitable for automotive radar applications, offering impressive accuracy and reliability.
Analysis of Clean Water Distribution Pipe Network PDAM Way Rilau Using Epanet 2.2 Software (Case Study: District Meter Area G26) Jalal, Muhammad Agung Wijdan; Zakaria, Ahmad; Ashruri, Ashruri; Wahono, Endro P.
Journal of Engineering and Scientific Research Vol. 7 No. 2 (2025)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jesr.v7i2.225

Abstract

As the population continues to grow, the demand for clean water has risen significantly, requiring Regional Drinking Water Companies (PDAMs) to ensure optimal service by maintaining quality, quantity, and continuity. This study focuses on projecting the clean water demand for PDAM Way Rilau in the DMA G26 service area of Sukabumi Village over the next 20 years, based on current customer data, while also evaluating the adequacy of its production capacity through 2044. Additionally, the research includes a simulation and assessment of the existing water distribution network in 2024 using Epanet version 2.2. The methodology involves projecting customer growth using arithmetic, geometric, and exponential models, followed by calculations of future water demand and analysis of the pipeline system. Results indicate that the projected maximum daily water demand in 2044 will reach 603,245 liters per day (6.982 L/s), while the current production capacity of 1,143,936 liters per day (13.24 L/s) is adequate for long-term needs. However, Epanet simulations identified several technical issues, such as low pressure at nodes J372 and J370, high headloss in pipe Pi356, and below-standard flow velocity in 13 pipes. These issues were addressed by adjusting pipe diameters and increasing reservoir head, resulting in improved network performance under both normal and peak conditions.

Page 14 of 15 | Total Record : 141

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