JIT: Journal of Innovation and Technology is published by the Engineering Forum of Western Indonesian Government Universities Board (Forum Teknik, BKS-PTN Wilayah Barat) Indonesia. We are delighted to announce that JIT has been accredited by the National Journal Accreditation (ARJUNA) Managed by the Ministry of Research, Technology, and Higher Education, Republic Indonesia with Grade 5th (Sinta 5) since Vol. 1 Ed. 1 April 2020 valid through Vol. 5 Ed. 2 October 2024. The accreditation is according to decree no. 225/E/KPT/2022, dated 7 December 2022. The certificate is attached. Journal of Innovation and Technology aims to publish original research articles and critical review manuscripts in Engineering and technology. The topics include but are not limited to Chemical and Environmental Engineering, Mechanical and Manufacturing, Industrial Engineering, Computer and Information Technology, Electrical and Telecommunication, Materials and Mining, Civil and Geodetic Engineering, Architecture and Urban Planning, Geophysical Science and Engineering, Physics Science and Engineering, Mathematics and Applied Sciences, Medical Science and Biomedical Engineering, Food Science and Agricultural Engineering, Science Innovation and Interdisciplinary Engineering research. The publication schedule is planned to be two times per year: April and October, starting from Vol. 1 No. 1, April 2020. JIT is hosted by the Faculty of Engineering, Universitas Lampung, and the Faculty of Engineering Universitas Maritim Raja Ali Haji (UMRAH). We invite all lecturers, postgraduate students, and researchers to contribute to the manuscript submission.
Engineering Forum of Western Indonesian Government Universities Board (Forum Teknik, BKS-PTN Wilayah Barat) Indonesia
The Effect of Welding Current on the Mechanical Properties of AISI 1040 Steel and AISI 1020 Steel in Bimetal Welding Using the Shielded Metal Arc Welding Method with AWS E 7016 Electrodes
This article discusses bimetal welding between AISI 1040 steel and AISI 1020 steel using the Shielded Metal Arc Welding (SMAW) method with AWS E 7016 electrodes. The purpose of the study was to evaluate the quality of the welded joint, including the mechanical properties and microstructure of the bimetal welding results. The use of high-strength AISI 1040 steel and AISI 1020 steel with malleable properties aims to produce a joint that optimizes the characteristics of each material. The welding process was carried out with varying current parameters to determine its effect on the welding results. Testing included tensile testing, hardness testing, impact testing, and microstructure analysis. The results showed that variations in welding parameters affected the mechanical properties of the joint and the distribution of microstructures in the weld zone, heat-affected zone (HAZ), and base metal. The optimal welded joint was obtained by setting certain current parameters that produced maximum tensile strength and even hardness distribution. This study contributes to the development of bimetal welding technology, especially for applications that require a combination of mechanical properties of two types of steel.
Copyright (c) 2025 Journal of Innovation and Technology
The Effect of Welding Speed on the Welding Quality AISI 1020 and AISI 1050 Steel Using Shielded Metal Arc Welding Technology
Material joining techniques are divided into two categories: similar joints and dissimilar joints. The difference in thermal cycles experienced by each material is the reason why dissimilar welding is more challenging than similar welding. The welding process that joins two materials with different properties is commonly used to improve effectiveness and efficiency in production, as well as to improve product quality. This trend has become popular in the manufacturing industry, including in the manufacture of tailor welded blanks, transportation vehicle frames such as aircraft, trains, and cars, as well as in the manufacture of public and private vehicle accessories such as aircraft panels and exhausts. The materials currently widely used in exploration are stainless steel combined with carbon steel, as well as a mixture of stainless steel and low carbon steel, which is quite challenging to weld but offers the advantages of higher strength, corrosion resistance, and lighter weight. This challenge can be overcome through liquid welding methods, one of which is the "SMAW (Shielded Metal Arc Welding)" technique. This study used variations in welding time at 5, 10, and 10 m/minute. Quality testing was carried out using visual tests, tensile tests, and impact tests, using AISI 1020 steel and AISI 1050 steel. Based on the test results, there was a significant difference in that the welds appeared to be shinier. The tensile strength results were in the form of average strain values for each specimen, which were 0.0705 mm, 0.0487 mm, and 0.1074 mm. The impact test results, which compared toughness values using a predetermined welding time variation of 16.5 joules, showed an average toughness value of 0.1948 J/mm².
Ergonomic Analysis of a Modified Dishwashing Facility in a Medium Scale Restaurant
Dishwashing is a crucial stage in the production process of restaurants, where ergonomic aspects for the operators play an important role in determining overall productivity. To support the performance improvement of small and medium enterprises (SMEs), this study conducted an experimental analysis to evaluate the ergonomic level of dishwashing activities in a restaurant located in Bandar Lampung. Prior to the assessment, modifications had been made to the design of the dishwashing facility. The evaluation was carried out using the Ovako Work Posture Analysis System (OWAS), energy consumption analysis, the Nordic Body Map (NBM) questionnaire, and an investigation of the relationship between ergonomic levels and operator productivity. The results revealed that the modified design significantly improved the ergonomic quality of the facility and led to a measurable increase in operator productivity. These findings demonstrate that workplace design improvements in SMEs can effectively enhance both ergonomics and business performance.
The Effect of Fracture Strength of Composite Materials with the Addition of Pineapple Leaf Fiber
Composite materials with unsaturated polyester matrix reinforced with natural fibres were developed to make biodegradable composite materials so that the waste does not damage the environment. Regarding mechanical strength, natural fibre-based composites are still lower in mechanical strength than composite materials with synthetic fibre reinforcement. These weaknesses include easy cracking when hit because they are brittle and have a small plastic deformation area. Some actions that will be carried out in this study are the addition of pineapple fibres with unsaturated polyesters that can form composites that are resistant to cracking. The addition of pineapple fibers to unsaturated polyesters up to 20% can have the highest fracture strength with a value of K1C = 1.733 MPa.m0.5, whereas pure unsaturated polyester without a mixture of pineapple fibres only has a fracture strength of K1C = 0.779 MPa.m0.5. From the results of the study, the addition of pineapple fibres can increase the fracture strength of polyester materials by 222.47%.
Implementation of the Biophilic Design Concept to Co-working Space in Bandar Lampung
The current industrial revolution 4.0 has a major impact on the Indonesian economy, one of which is the emergence of startup business models. The current millennial generation is required to be able to innovate, collaborate and create new discoveries. The need for co-working space is important because it can accommodate these activities with its flexible and collaborative nature. Working indoors continuously for long periods of time can cause nature deficit disorders or reduce human well-being and can cause stress due to lack of interaction with nature. Biophilic design is a solution to reduce stress levels in workers because it has a positive impact on health. The basic concept of biophilic is to connect humans and nature in architecture. This study used descriptive qualitative method. Data collection and data analysis techniques include observation, documentation and literature study through scientific references. The design of the co-working space in Bandar Lampung aims to provide a new space for the young generation to be creative, collaborate and create new discoveries supported by a biophilic approach to reduce user stress levels and support the creative process of innovation. The basic concept of biophilic is applied well in buildings by implementing 14 biophilic design patterns.
Statistical Performance Analysis of a 20 kV Circuit Breaker at Bangka Substation
This study evaluates the performance of 20 kV circuit breakers by analyzing insulation resistance, contact resistance, contact synchronization, leakage current, and power loss. The insulation resistance analysis indicated that phases R and S did not show significant improvement after maintenance, with significance values of 0.065 and 0.166, respectively, while phase T exhibited a significant improvement with a significance value of 0.048. Contact resistance measurements revealed no statistically significant reductions after maintenance, with significance values of 0.209, 0.243, and 0.155 for phases R, S, and T, respectively. Additionally, contact synchronization in the open condition did not experience significant variations, whereas in the closed condition, all phases showed significant declines in synchronization after maintenance, with significance values of 0.003, 0.013, and 0.007. Leakage current analysis at a 20 kV phase-to-ground voltage showed that the highest recorded leakage current was 0.297 mA in the Eks Sumberejo feeder, significantly below the 20 mA threshold. Power loss calculations identified the highest power dissipation in the Depati Hamzah feeder at 69.87 W, with the lowest in the Eks Transmart feeder at 0.376 W. Energy loss assessment further showed the Depati Hamzah feeder experiencing the highest loss at 48.317 kWh, while the Eks Transmart feeder had the lowest at 0.278 kWh. These findings underscore the importance of routine monitoring and targeted maintenance to enhance circuit breaker reliability, optimize operational efficiency, and minimize energy losses in high-voltage electrical networks.
Vehicle Safety System Integrated with GSM Network (Global System for Mobile Communications) on Vehicle Ignition System
This research aims to design and create a sms-based motor vehicle security system with an ATMega 8535 microcontroller. This research utilizes hand phone technology and microcontroller. Making this tool has an economical price to secure motorized vehicles. Important prototypes in making this tool are the ATMega 8535 microcontroller, GSM Modem and HP. In making this tool the first thing to make is to make a microcontroller program for the controller. Making this program uses CV Avr soft ware (Code Vision Avr). After the program is finished, the program is downloaded to the microcontroller. Control is done by the microcontroller when it gets input. The result of this research is to get a vehicle security system that is integrated by the ignition system on a motorcycle. The process of securing a motorized vehicle when it is stolen is, the security system will send sms information that the motorcycle is stolen, the alarm sounds and the ignition system is cut off. To turn off the alarm and start the motorcycle, the owner sends an SMS with the format *ALOF# to the security system and starts the motorcycle normally (Pull the front brake three times then position the key to ON mode).
Investigation of Electrical Voltage Influence on Thermoelectric Cooler (TEC) Performance in a Stacked Cooling Enclosure
The Thermoelectric Cooler (TEC) is an environmentally friendly solid-state cooling technology with wide application potential. This study aims to analyze the effect of voltage variation on the thermal performance of a TEC-based cooling system applied to a prototype cooling box. The methodology involved designing a system with eight symmetrically installed TEC units, tested at five voltage levels: 16 V, 18 V, 20 V, 22 V, and 24 V. Evaluated parameters included cold and hot side temperatures, heat absorbed (Qc), and Coefficient of Performance (COP). Experimental results revealed that increasing voltage up to 22 V significantly enhanced system efficiency, with the highest COP of 0.25 and maximum Qc of 5.24 W. However, at 24 V, performance declined due to excessive heat accumulation on the hot side of the TEC, exceeding heat dissipation capacity. In conclusion, an optimal input voltage of 22 V was identified to yield the most efficient cooling performance. These findings support the applicability of TEC technology for compact and sustainable cooling systems.
Thermoelectric Cooler, electrical voltage, thermal performance, Coefficient of Performance
Implementation of Exploratory Data Analysis (EDA) in Predicting Customer Churn Decision Levels Using Naive Bayes Algorithm
This study aims to explore the use of Exploratory Data Analysis (EDA) for predicting customer churn decisions at service provider companies. Using the Naive Bayes algorithm within the RapidMiner environment, the research analyzes customer behavior patterns to determine key influencing factors. The process involves structured data preprocessing, visualization, and model evaluation through accuracy, precision, recall, and F1-score metrics. The results show that EDA coupled with the Naive Bayes model provides valuable insights and reaches an accuracy of over 82%, making it a reliable decision-support tool for customer retention strategies. This study contributes to data-driven approaches in customer relationship management.
Copyright (c) 2026 Journal of Innovation and Technology
The Effect of Matos Soil Stabilizer Addition to Fly Ash Stabilized Road Foundation Layer on the Index Properties of Soil
In pavement construction, it consists of subgrade, foundation layer and overburden. In working on landfill, the quality of the landfill can be improved by stabilization. Stabilization is a way to improve the properties and parameters of the soil, so that the soil is suitable or qualified to be used according to its function. One of the ways to stabilize soil is by chemical stabilization. In this research using additives such as fly ash & matos soil stabilizer. The soil samples were taken from Peniraman Quarry, Mempawah Regency. Also, the fly ash used comes from the waste of Paiton power plant, Probolinggo Regency. The tests carried out were testing the physical properties of the soil. The results obtained were then adjusted to the lower foundation layer of the road with specifications based on the 2018 General Specifications, Road and Bridge Construction Work (Revision 2). The test was carried out with a mixture of 10% fly ash and variations of matos soil stabilizer 2 - 8%, stabilization was carried out with a curing period of 0 - 14 days. From the results of the soil test, the plasticity index was found to be 14.252%. From the test results of the highest mixture variation, which is a mixture of soil + 10% fly ash + 8% matos soil stabilizer with a curing period of 14 days. The test results obtained a plasticity index of 7.295%, so it can be concluded that the higher the percentage of matos soil stabilizer used, the plasticity index value of the soil decreases and has met the requirements in the construction of the lower foundation layer of the road (B class).
Fly ash, plasticity index, sub base course, matos soil stabilizer
Comparison Study Between the Experimental and Finite Element Analysis (FEA) on a Static Load of Magnesium AZ31B as Biodegradable Bone Plate Material
Biomaterials is an advanced material engineering technology that is used to help heal bone fractures or fractures. Currently, many biomaterials use materials such as titanium alloy, stainless steel, platinum, and chromium, but these materials cannot be degraded naturally so a second operation must be carried out to remove the installed biomaterial. Biomaterials are temporary in nature so when the bone returns to its original state, the biomaterial must be surgically removed. Research was conducted to obtain a design with a material that can be naturally degraded without causing toxicity. Magnesium AZ31B is a recommended candidate as a base material for degradable bone implants. Magnesium AZ31B material, it is expected to reduce or minimize the surgical removal of implant biomaterials. Bone plate geometry use plate bone dimension 150mm x 15mm x 3mm with variation 10 hole parallel and zigzag as well as with a bolt bone dimensions long 40 mm with pitch 1mm diameter 5mm. Test bending was conducted with ASTM E290-14 showing that on plate bone hole parallel with burden maximum 33,419 KN with a deformation maximum of 30.89 mm whereas for plate bone hole zig zag with the burden maximum 32,863 KN with deformation maximum big as 29.97 mm. From the study experimental that plate bone hole parallel have nature mechanic more tall compared with plate bone hole zig Zag although with the difference which is not significant. Whereas on simulation FEA plate bone hole parallel with burden 33,419 KN get results total deformation as big as 31,481 mm with von Mises stress 15,337 MPa, then for plate bone hole zig Zag with burden 32,863 KN with total deformation 32.466 mm and von Mises stress as big as 33,948 MPa. In testing by experiment and simulation FEA plate bone hole parallel get difference around 0.591 mm or 0.94% whereas for plate bone hole zig Zag in testing by experiment and simulation get difference around 2,893 mm or 4.60%.
Utilization of Spent Bleaching Earth Waste in Soil-Lime Stabilization for Road Body Foundation Layers Based on Index Properties
Spent Bleaching Earth (SBE) is a mixed material between bleaching earth and organic compounds derived from bleached crude oil. In addition, spent bleaching earth still contains a component of phosphoric acid. This phosphoric acid comes from the degumming process which is brought to the bleaching process by oil. According to Government Regulation Number 22/21 concerning Implementation of Environmental Management and Protection, this spent bleaching earth is classified as non-B3 waste depth. Chemical stabilization is by mixing chemicals into the soil material which causes a chemical reaction to occur between the mixing material and the soil which will produce new materials that have better quality. From the results of the physical properties experiment, it was found that the mixture with the optimum value for soil-lime stabilization was 10% SBE.
Effect of Sintering Temperature on The Adhesion Quality of Hydroxyapatite on Porous Tantalum for Cancellous Bone Implant Application
Porous tantalum has been recently recognized as a conventional orthopedic implant for bone substitute applications besides stainless steel, cobalt-chromium, titanium, and other metallic alloys. Porous tantalum has excellent mechanical and osseointegration properties similar to cancellous bone structure. To optimize the utilization, the dip coating technique was applied to coat porous tantalum with hydroxyapatite (HA). X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques investigate the coating characterization. HA is a bioceramic material that used for bone substitutes due to its chemical and structural similarity to bone minerals. Coated porous tantalum requires the sintering process of porous tantalum to adhere to HA. During the sintering process, various temperatures (650°C, 750°C, 850°C, 950°C, and 1100°C) were used to determine the optimum temperature for porous tantalum coated with HA. The heating rate is 1°C/1 min and the holding time is 60 minutes. The result shows that the optimum temperature of HA-coated porous tantalum is at 850°C. The morphology structure of the HA-coated porous tantalum shows that the adhesion between porous tantalum and HA is in good condition. The element in the HA-coated porous tantalum shows that the existence of HA is high.
Analysis of PM2.5 Level Related to Vehicle Activities in Campus Parking Lot
The number of vehicle usage, especially motorcycles, in Indonesia has significantly increased in the past 10 years, particularly among young people. This has had an impact on the declining air quality in public places, including on campus grounds. PM2.5, as one of the hazardous pollutants to health, needs to be given special attention regarding its dispersion concentration in areas heavily frequented by the public, such as parking lots on campus. This study analyzes the level of PM2.5 concentration in the campus parking lots at Universitas Lampung, with the aim of observing the pattern of PM2.5 pollution in the campus area, considering the increasing number of motorcycles entering the campus every year. The measurement of PM2.5 levels was conducted using a light scattering sensor in two parking lots with different microenvironments, and then its correlation with motorcycle activities at each location was analyzed using simple regression. Based on statistical analysis, it was found that the differences in microenvironments affect PM2.5 levels significantly. The number of motorcycle activities also has a positive correlation with the level of PM2.5, where the average PM2.5 concentration recorded has exceeded the threshold set by the government, which is 15 µg/m3 per day. However, the effect of the microenvironment in this study is stronger than the number of vehicles. Therefore, in the future, appropriate policies and strategies are needed to reduce PM2.5 concentrations in public areas, especially on campuses, to prevent the associated risks of the pollution.
Copyright (c) 2024 Journal of Innovation and Technology
The Effect of Matos Soil Stabilizer on Mechanical Properties of Soil Stabilized with Cement
Evaluation of Swelling – Shrinkage of Soil Stabilized with Cement and Spent Bleaching Earth
This research aims to investigate the effect of using Spent Bleaching Earth (SBE) as a soil stabilizer in cement-stabilized soil. The study employs a 5% Portland Composite Cement (PCC) ratio based on the dry soil weight, with SBE as a stabilizing agent at ratios of 5%, 10%, 15%, and 20% of the Portland Composite Cement weight. Curing periods of 0 days, 7 days, and 14 days are used, with a focus on the expansion and shrinkage characteristics. The best results were obtained in a mixture with a 10% SBE variation as a soil stabilizer, under a 14-day curing period, with a plasticity index of 14.149%, Expansion (CBR Soaked) of 1.178, Expansion Pressure of 1,706 kg/cm2, and free expansion index of 13.333%. Test results indicate that mixtures with various amounts of SBE as a soil stabilizer in cement-treated soil and different curing periods can reduce soil expansion, as evidenced by decreasing values of plasticity index, Expansion (CBR Soaked), expansion pressure, and free expansion index. Therefore, it can be concluded that SBE as a soil stabilizer, along with prolonged curing, can reduce the soil's expansion and shrinkage characteristics.
The Influence of Adding Matos Soil Stabilizer to the Foundation Layer of a Road Body Stabilized Using Lime on it’s Physical Properties.
From the perspective of Civil Engineering, soil is a collection of minerals, organic matter, and relatively loose deposits, which are located on bedrock. The relatively weak bonds between grains can be caused by carbonates, organic matter, or oxides precipitating between the particles. The space between the particles can contain water, air, or both. The process of physical soil formation that changes rock into smaller particles, occurs due to the effects of erosion, wind, water, humans, or the destruction of soil particles due to changes in temperature or weather. Soil stabilization with lime and matos soil stabilizer is an alternative soil improvement by adding additives. Soil stabilization with lime and matos soil stabilizer as a mixture of crushed soil, lime, matos soil stabilizer, and water which is then compacted to produce a new material, where strength, deformation characteristics, resistance to water, weather, and so on can be adjusted with the need for road pavement, building and road foundations, streams, retaining walls and so on. The physical properties test used is water content (w), γ = soil volume weight (gr/cm3), specific gravity (Gs), atterberg limits, permeability, hydrometer and gradation analysis
Intelligent Eyes on the Battlefield: Developing an AI-Vision Based Military Vehicle and Infantry Detection System
The importance of accurate, real-time intelligence in modern warfare is crucial, especially in reconnaissance and surveillance operations. Currently, drones are widely used for reconnaissance, but generally rely only on the operator's ability to monitor operation targets. This research is aimed at developing an AI vision assistance system to enhance the ability to detect military vehicles and infantry. The method used is computer vision trained to recognize and differentiate several military objects. The YOLO model is used to detect and distinguish objects. To improve detection capabilities, the YOLO v8 model was retrained with an additional dataset sourced from battle recordings on the battlefield. The results show a detection accuracy rate of 95% in detecting vehicles and infantry under normal visual conditions. The model from this research can be used to enhance the capabilities of reconnaissance drones and the effectiveness of monitoring operations.
Experimental trials to detect the lateral displacement on granular material embankment inserted geosynthetics due to the vertical loads
The usage of geosynthetics to improve the bearing capacity on granular material of embankment construction is worldwide familiar applied. The paper elaborates the lateral displacement of embankment inserted geosynthetics resulted vertical load on the top of embankment. This type of construction is applied like Mechanically Stabilized Earth- Retaining Wall (MSE-RW). Varied distances of inserted geosynthetics with low tensile strength on granular material of embankment for 20, 30, 40, 60 respectively cm installed on totally 140 cm-high of embankment. Each of layer is installed with varied distances with 120 cm -wide must be wrapped in order to avoid loses grains of granular material of embankment. The varied vertical surcharge at the above of embankment started with 19, 34, 49 kg respectively. The result of research indicates that number layer with inserted geosynthetics on granular material of embankment influences the lateral deflections which much more layers of geosynthetics or smaller vertical distance of geosynthetics provides smaller lateral deflection. Beside that increased vertical load implies the lateral deflection is increased.
Integrating Blue Carbon Estimation into Mangrove-Based Coastal Protection Infrastructure Planning: A Case Study in Dompak Island, Tanjungpinang
Ecosystem-based coastal protection offers a strategic approach to mitigating the impacts of climate change, particularly in small island contexts. This study integrates remote sensing and geospatial analysis to estimate blue carbon stocks in the mangrove ecosystems of Dompak Island, Tanjungpinang, using Google Earth Engine (GEE) and Sentinel-2 satellite imagery. Through the application of the Normalized Difference Vegetation Index (NDVI) and an empirical model for Above Ground Biomass (AGB), spatial carbon stock distributions were generated and classified into three functional zones: conservation, restoration, and critical protection. Results reveal that areas with moderate vegetation exhibit the highest carbon stock (32.00 tons/ha), suggesting ongoing biomass accumulation. This spatial analysis informs a zoning framework that supports ecosystem-based infrastructure planning. The integration of carbon mapping with adaptive civil engineering strategies demonstrates a scalable model for climate-resilient coastal development in vulnerable regions.
New Viewpoint Era of Weather Monitoring: Arduino Based Portable Weather Station Design
Weather changes play a crucial role in key sectors in Indonesia, such as agriculture and fisheries. However, limited weather data in all regions is an obstacle. This research proposes an innovative Arduino-based weather monitoring instrument that is flexible, economical and increases data availability in Indonesia. The ergonomic and flexible design of the Portable Weather Station allows mobility without dependence on building structures. With real-time monitoring using sensors for temperature, humidity, air pressure, wind speed and wind direction, this tool provides comprehensive information. Field testing shows good operation. The diversity of sensor parameters and efficient design make the Portable Weather Station innovative. Optimizing energy use and integration of advanced technologies, such as remote monitoring and cloud data processing, are recommended. The benefits involve easy and accurate access to weather information, supporting vital sectors. With continuous monitoring and evaluation, the Portable Weather Station has the potential to be an effective solution in dynamic weather monitoring, advancing sectors such as agriculture, fisheries and environmental policy, and creating communities that are more resilient to climate and economic change.
Study of Deformation Behavior of Retaining Walls at Sepakat Ii Parallel Road Project in Pontianak City
The development of urban planning and infrastructure such as roads, buildings, bridges, ports has increased in recent years in Pontianak City. One of them is the construction of Jalan Parallel Sepakat II which was carried out in early 2022, connecting Jalan Sepakat II to the Tanjungpura University Campus Complex. In the case in the field, the previously compacted embankment has decreased, so backfilling is carried out to adjust the planned elevation. Due to the unsafe existing condition factor, improvements were made that were supported by retaining wall modeling. In addition to the retaining wall modeling, the current planning in the field is also stabilized by using a pile and geotextile, in order to increase the bearing capacity of the soil and can minimize the decrease or deformation that occurs at the research location. In the process of analyzing the retaining wall, analysis is also carried out with the Plaxis Proffesional 8.6 program. The results obtained in the form of deformation numbers and safety factor results. From the conclusion, the factor of safety is obtained which is not safe so that it is feasible to be reinforced. However, some adjustments are needed to the design plan so that it can function properly in accordance with the intent and purpose of the reinforcement.
Weather Forecast for Bandar Lampung City Using Random Forest and C4.5
Weather forecasts are important information for various agencies and the wider community. Weather forecasts are usually used to benefit various sectors such as transportation, tourism, plantations and others. This study aims to create a new model regarding weather forecasting using the random forest and C4.5 algorithms using the WEKA application. The dataset uses data from the Panjang Maritime Meteorological Station with 365 days of data and six attributes: rain intensity, average temperature, humidity, rainfall, sunshine duration and average wind speed. The results obtained from this study between the random forest algorithm and C4.5, namely cross-validation trials fold 5, 10 and 15 random forests, have better results than C4.5 by using the MAE and RMSE evaluation values, then in testing with a percentage split 25% on the evaluation of the MAE value is better at C4.5. Still, the random forest has better results for all experiments evaluating the RMSE value and two evaluations of the MAE value.
Simulation Study of Small-Scale Electricity Generation Plant Utilizing Flue Gas of Solid Garbage Waste Incineration as Energy Source
This study aims to get an overview of the operational parameters of a small-scale electrical generation plant that utilizes thermal energy included in the flue gases of garbage waste incineration. The organic Rankine cycle (ORC) thermodynamic system was performed to evaluate this system. The organic fluid was used as a heat transfer medium instead of water because it has a low boiling point so it does not require a lot of thermal energy to generate small-scale electric power. Hexane was used as the working fluid and Aspen Hysys was used as a tool to perform simulations. The plant is optimized through the operating temperature, working fluid flow rate, and pressure to obtain electrical output power that can be obtained. The simulation results show that flue gas at a temperature range of 300 to 350 0C can produce electric power in the ranges of 7.84 to 128.6 kW at a working pressure ranges of 2.5 to 7.5 bar, and working fluid flow rate of 3.600 to 10.100 kg/h
Escalation of Visual Street Furniture Accentuation at Public Corridor of Baiturrahman Mosque in Putroe Phang Park
The public corridor is the basic character of the road which represents a linear movement space, becomes a provision for circulation. The road corridor as a linear space is not only a circulation space, but as part of a community activity space that has the potential to increase and develop. The formulation of the problem in this study is how to identify street furniture in public corridors, visual accentuation of street furniture in public corridors and escalation of visual accentuation of street furniture in public corridors. Aims to find out how the escalation of the visual accentuation of street furniture. This study uses a quantitative method with a descriptive approach. The results obtained from this study are that the majority of respondents to street furniture that are more attractive and prominent are decorative lights. However, street furniture that doesn't stand out is the sidewalk. Things that must be escalated are sidewalks and facilities with pedestrian paths. To create a good pedestrian path, it must have complete, safe and comfortable criteria.
Copyright (c) 2023 Journal of Innovation and Technology
Renewable Energy in Bangka Belitung Island Province
Bangka Belitung Island Province, which consists of 7 regencies/cities, has the potential for new renewable energy, both solar, wind, marine and biomass. Energy management policies in the regions have been outlined in regional regulations concerning the 2019-2050 regional general energy plan. It is targeted that in 2025, the energy mix will reach 17.21% and 30.97% in 2050. This article aims to highlight the potential and challenges on development and managing the renewable energy in Bangka Belitung Island Province.
Effect of the Depth of Cut on the Age of High-Speed Steel (HSS) Lathe Tool for the Low Carbon Steel Outer Turning
Abstract In the machining process, there are three parameters that need to be determined before the machining process is carried out, namely: depth of cut (a), feed motion (f) and cutting speed (v). Determination of the three parameters of the machining process will determine the quality of the product to match the desired geometry and tolerance. The three parameters of the machining process will affect tool life, where the selection of a constant depth of cut and feed motion will produce the most optimum level of tool wear. This study used several machining parameters with several variations, namely: depth of cut (a) of 0.5 mm; 0.8mm; 1.1mm; and 1.4 mm and feeding motion (f) of 0.062 mm/revolution and 0.1 mm/revolution. The machining process is carried out at a constant (n) rotation of 425 rpm. Based on the research that has been done, it was found that the tool life on the feed motion (f) = 0.062 mm/revolution is better than that on the feed motion (f) = 0.1 mm/revolution, where at (f) = 0.1 mm/revolution chisel wears out faster. Optimum cutting conditions are produced at feed motion (f) = 0.062 mm/revolution and with a depth of cut (a) = 1.1 mm where the production cost (Cp) is Rp.746.56/product.
Analysis of the Potential of North Bengkulu's Air Nokan River in the Context of Fulfilling Water Needs for Micro-hydro Power Plants and Irrigation
The Air Nokan River is located in Kemumu Village, Arma Jaya District, North Bengkulu Regency which is thought to have potential for agricultural water resources and Micro Hydro Power Plants (PLTMH).The detailed objectives of this study are as follows: i). Calculating how much water is available in the Air Nokan river. ii). Calculating the water requirement for an irrigation area. iii). Calculating the need for water for power generation and iv). Designing buildings for PLTMH. The method of this study is to use various mathematical equations that have been found by previous researchers. The primary data used are river dimensions and flow velocity. The water discharge in the river is calculated using the continuity equation. The mainstay discharge is calculated using the Mock method. Secondary data in the form of rainfall was obtained from three rain measuring stations. Rainfall data is processed using the algebraic average method. Climatological data were obtained from BMKG Bengkulu Province. Evapotranspiration was calculated using the modified Penman method. The results of data processing obtained a cross-sectional area of ??the river 58 m2 and a flow velocity of 1.5 m/s so that the river water discharge is 69.6 m3/s. The maximum discharge required for irrigation purposes is 2.13 m3/s. The maximum discharge required for power generation is 5.5 m3/s. The mainstay discharge with the lowest 85% probability in January is 7.63 m3/s.Based on the results of the analysis, it was concluded that the Air Nokan river can meet the needs of water to flow irrigation canals and power plants
Modification of Casava Starch Properties by Spontanesous Fermentation
The impact of spontaneous fermentation on the physical and chemical characteristics of fluidized cassava starch treated in a sedimentation tank were examined. Tapioka, aci puter, and elot are three types of casava starch products that were made from starch slurry collected at various periods of spontaneous fermentation. By different spontaneous fermentation time, the appearance of granules was significantly changed. Besides, there was diffrent response color to iodine test indicating a different amylopectin chain-length distribution pattern. Among them, there were significant differences in moisture content, swelling power, water absorption ratio, gel formation ability and pH value. These studies showed that spontaneous fermentation might be used to modify casava starch products.
The Selection of Suppliers of Ready Mix Concrete Raw Materials Using the Fuzzy AHP Method (The Case Studies: Sadawarna Dam Construction Project Package 1)
The construction of facilities such as buildings, roads, and dams has an important part role in supporting daily life activities. One of all the facilities currently being built is the Sadawarna Dam Construction Project Package 1. Where does the project function to supply the needs of water resources and irrigation in West Java. However, in the construction process the project has encountered obstacles such as delays in the delivery of raw materials by the suppliers which caused the casting time to be delayed. The solution to these problems can be found by the improvement the supplier selection method. One of the methods that can be used is the Fuzzy Analytical Hierarchy Process (Fuzzy-AHP). Where in the process will expand measuring tools in the selection decisions that involve expert respondent. As The variables in determining suppliers use 4 criteria such as price, delivery, quality, and location as well as 7 sub-criteria such as payment methods, bid prices, delivery times, delivery of flexibility, delivery of capacity, consistency of quality, and specification conformance. From these variables, a comparison value with the AHP scale will be obtained which will be converted into a Triangular Fuzzy Number (TFN) scale. The results of this research obtained the best criteria is quality and sub-criteria is the bid price, as well as the best alternative from the selection of suppliers of concrete raw materials suppliers of fine aggregate materials is CV BTP Cimalaka at 51.3% and suppliers of coarse aggregate materials are PT Fajar Mandiri at 63.7%.
Fuzzy Analytical Hierarchy Process, Decision Making, Supplier Selection, Aggregate, Triangular Fuzzy Number (TFN)