Journal of Engineering and Scientific Research

Wireline Logging Data Interpretation on Coal Quality Value in The West Bangko Mining Area

2025-12-17T11:45:00+00:00

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 Hardness Test and Microstructure Test of R.54 Type Railway Rail with Variations in Heat Treatment Cooling Media

2025-12-31T11:33:44+00:00

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.

An Analysis Of Way Halim Community Preparedness Post-Flood Disaster Perspective On The Implementation Of Disaster Mitigation Management: 24 February 2024

2025-12-17T14:58:55+00:00

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 and
outreach, 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.

Characteristics of silica in mountain area tapa and sorrounding areas of Tulang Bawang Regency Lampung Province

2025-12-17T15:05:03+00:00

PERCEPTUAL STUDY OF USER COMFORT REGARDING THE TEMPERATURE COMFORT OF LEARNING TEACHING SPACE IN BUILDING B OF THE FACULTY ENGINEERING, ARCHITECTURE DEPARTMENT, LAMPUNG UNIVERSITY.

2025-12-31T11:35:32+00:00

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.

Analysis of the Actviness Library Members Using K-Means Clustering

2025-12-31T11:31:46+00:00

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

2025-12-17T14:54:03+00:00

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

2025-12-31T11:29:43+00:00

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

2025-12-31T11:28:05+00:00

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)

2025-12-17T14:53:01+00:00

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.

Investment Analysis of Heavy Equipments for Cut and Fill Work on Toll Road Construction Project

2025-12-21T09:22:46+00:00

Toll roads are vital infrastructure; however, their construction requires significant capital expenditures. One significant cost component is the cost of heavy equipment. The investment schemes considered in this study are cash new purchase, leasing, and rental. The best investment decision requires engineering investment analysis, including the NPV, IRR, BCR, and PP methods. The estimated cost of owning heavy equipment with a cash scheme is Rp 46.06 billion, a leasing scheme is Rp 53.50 billion, and a rental scheme is Rp 66.66 billion. The operating cost for all schemes is the same, amounting to Rp 56.44 billion during the construction period. The financial analysis results show that the cash scheme is the best with an NPV of Rp 9,198 billion, an IRR of 10.39%, a BCR of 1.12, and a PP of 3,3 years. Sensitivity analysis to interest rate increases shows that the cash scheme is feasible up to a 10% interest rate.