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Teknika: Jurnal Sains dan Teknologi
Published by Universitas Sultan Ageng Tirtayasa
ISSN : 1693024X     EISSN : 26544113     DOI : http://dx.doi.org/10.36055/tjst
Core Subject : Engineering,
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering
Teknika: Jurnal Sains dan Teknologi merupakan jurnal peer-reviewed dalam Bahasa Indonesia di bidang keteknikan, diantaranya bidang teknik sipil, bidang teknik mesin, bidang teknik industri, bidang teknik kimia, bidang teknik metalurgi, dan bidang teknik elektro.
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Articles 318 Documents
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Optimization of time scheduling planning with the precedence diagram method (PDM) on the drainage construction project Siregar, Adde Currie; Noorkhayati, Noorkhayati; Yatnikasari, Santi; Aprisandi, Dasa; Agustina, Fitriyati
Jurnal Teknika Vol 20, No 1 (2024): Available Online in June 2024
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/tjst.v20i1.24193

Abstract

Jalan Pemuda 1 is one of the city roads located in the Samarinda region that often experiences flooding. Therefore, the construction of adequate drainage is necessary to address this flood issue. The construction of this drainage system is expected to effectively solve the flooding problems in the area. The project utilizes precast U-ditches as part of the drainage, replacing the less effective manual methods. The project site frequently experiences tidal fluctuations from the Karangmumus River, which triggers the floods. The U-ditch Precast has dimensions of 240 cm width, 180 cm height, and 10 cm length. Additionally, this research aims to analyze the time optimization in drainage channel construction projects using the Precedence Diagram Method (PDM). The critical tasks in the construction of the drainage channel project are also analyzed using the PDM method. In this research phase, the author chose the Precedence Diagram Method (PDM) not only to clarify the tasks but also to improve project management efficiency and effectiveness to achieve optimal results. The advantage of the Precedence Diagram Method (PDM) is that it does not require dummy or additional activities, simplifies the project network creation, and the interdependence between activities can be arranged without adding new tasks. The accelerated tasks include mobility work, reduced from 7 days to 2 days, and demobilization, reduced from 7 days to 1 day. The occupational safety and health management system (K3) is reduced from 7 days to 2 days, and utility tasks (PDAM, PLN, Telkom) are reduced from 7 days to 2 days. The initial project scheduling indicates a duration of 210 days, but with optimization, the project is completed in 196 days, resulting in a time savings of 13 days. This study provides insights into the effectiveness of the PDM method in addressing critical challenges in construction projects, with implementation leading to more efficient planning and timely project completion.
Effect of annealing to the mechanical Properties and microstructure of stainless steel foil for sensor of large automobile Aziz, Abdul; Putera, Alfi Eko
Jurnal Teknika Vol 20, No 1 (2024): Available Online in June 2024
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/tjst.v20i1.23046

Abstract

The SUS 316 thin metal foils have widely used  in the field of industries, such a electronic, industries. The aim of this research wants to clarify the effect of annealing and quench temper to the mechanical properties of SUS 316 thin metal foils. The SUS 316 thin metal foil (TMF) after annealing and  quench temper treatment at 900 oC for 3 hours were studied by uniaxial tensile and microstructure analysis. The SEM-EBSD investigation used for microstructure analysis.  The result of this research shown that the difference of uniaxial tensile test occur  in SUS 316L with different grain size (Dg) such as 1,0 um until 9,0 um. Martensitic phase transformation  (MPT) occur in SUS 316 TMF as shown in SEM-EBSD result. The microstructure change indicated by the change of grain misorientation (GMO) in SUS 316 TMF fine grains and coarse grain.
Design and development of aircraft cargo fire early detection simulation system using arduino nano microcontroller Chitraningrum, Nidya; Siswanti, Sri Dessy; Herdiana, Dina; Prasetiawan, Anton; Banowati, Lies; Muchtar, Kahlil; Sakti, Indra
Jurnal Teknika Vol 20, No 1 (2024): Available Online in June 2024
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/tjst.v20i1.22544

Abstract

Fire in the aircraft cargo can cause dangerous damage to aircraft systems during flight. To prevent aircraft cargo fires, the fire early detection system must be built. In this work, we design and develop the fire early detection simulation system for aircraft cargo using Arduino nano microcontroller. The aircraft cargo is prone to fire due to the load of any type of goods such as dangerous goods, flammable stuff, or liquids, etc. This paper simulates the fire that occurs in artificial aircraft cargo and designs the detection and extinguisher prototypes using three kind sensors: flame, smoke, and temperature sensors combined with SMS gateway for user notification.  We used SIM800L GSM module as communication tools to send and achieve data through short messages service (SMS) between security system and cellphones. Three sensors including flame, smoke, and temperature sensors were used as the warning indication to the hardware. When the sensors detect the fire and smoke, the red LED, buzzer, and vacuum pump will be on active mode, and SMS notification will be delivered immediately to the user’s cell phone. As the fire has been extinguished by the vacuum pump, the red LED, buzzer, and vacuum pump return to standby mode and the fire warning alarm system will turn off. This research is successfully developing the fire early detection simulation systems that can be applied in real aircraft cargo.
The stabilization of clay soil using wood sawdust ash and its effect against unconfined compressive strength (UCS) value Mina, Enden; Kusuma, Rama Indera; Fathonah, Woelandari; Ashari, Salsabila Joesi Nur
Jurnal Teknika Vol 19, No 2 (2023): AVAILABLE ONLINE IN NOVEMBER 2023
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/tjst.v19i2.20849

Abstract

Soil is the basis for the construction of roads, buildings, dams, and embankments. Construction activities on roads cannot be separated from soil works on which the infrastructure was built. This study aims to improve (stabilize) clay soil by taking a location in Juhut Village, Pandeglang Regency using sawdust ash from meranti wood. The effect of the addition of sawdust ash was studied against the unconfined compressive strength value of the soil and its properties using several variations of the mixture. The mix variations used in this study use sawdust wood ash percentages of 0%, 5%, 10%, and 15%. The effect of the mixture on soil properties was investigated by tested the physical and mechanical properties through soil classification test, Atterberg limits tests, specific gravity tests, compaction tests, and unconfined compressive strength tests. The results of analysis and laboratory tests show that the soil can be classified as clay with moderate to high plasticity (OH) based on the USCS classification. The optimum value of unconfined compressive strength was obtained by adding variations of sawdust wood ash obtained at 15% variation of wood sawdust ash with 28 days of curing time of 3.790 kg/cm2. While the soil plasticity index value decreased from 22.8% to 7% with the addition of sawdust wood ash at a percentage of 15%. Therefore, it can be concluded that the addition of sawdust wood ash for soil stabilization could increase a good effect on soil strength. 
Forming machine maintenance planning using the reliability centered maintenance (RCM) method at PT. KHI pipe industries Yusuf, Yusvardi; Djamal, Nugraheni; Cahyadi, Dadi
Jurnal Teknika Vol 20, No 1 (2024): Available Online in June 2024
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/tjst.v20i1.24215

Abstract

PT KHI Pipe Industries is a member of the Krakatau Steel Group which operates in the manufacturing industry. The company's main activity is the production of high quality steel pipes for oil and gas. The problems that occurred were breakdowns 19 times in one year and damage to one of the components on the forming machine. Currently the company is still implementing a Corrective Maintenance system. Based on the problem, maintenance proposals need to be made using the Reliability Centered Maintenance (RCM) method to determine critical components, find out the correct Task Selection (Action Selection), and provide improvement proposals. Based on the results of RCM research, the critical component in the forming machine is the Squeeze Top Roll component which consists of Bearing, Shaft, Sleeve, Cover Sleeve, and Roll Top. Obtained a broken bearing with an RPN value of 378, LTA category B, and Time Directed action selection; broken cover bolt with RPN value of 324, LTA category B, and Condition Directed action selection; rocking roll with an RPN value of 180, LTA category D, and selection of the Finding Failure action; worn shafting with an RPN value of 144, LTA category D, and selection of the Finding Failure action. Proposed improvements for components include making a maintenance schedule according to the component's service life, selecting the NUTR65150H bearing type, modifying the greasing line, carrying out routine checks once a week, and improving the design of the shafting, roll, bearing and top squeeze.
The relationship model between road surface roughness and functional condition values of the road surface using IKP method and IRI with roadroid application Lukman, Arbi Parianta; Mahendra, M. Oka; Yudhzan, M. Rafli
Jurnal Teknika Vol 20, No 1 (2024): Available Online in June 2024
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/tjst.v20i1.22673

Abstract

Pavement damage in road infrastructure is influenced by complex factors, particularly intense traffic and excessive loads, leading to quality decline and rapid deterioration. Evaluating road surface conditions is critical for making accurate maintenance decisions, and it needs both visual inspection and in-depth analysis. Early detection of possible faults is critical for avoiding severe harm and improving urban traffic management. Indeks Kondisi Perkerasan (IKP) and International Roughness Index (IRI) are two methodologies used in this study. Roadroid, an Android app, simplifies road roughness measurement and provides a low-cost alternative. With Indonesia's enormous road network, efficiency is critical. The study investigates the relationship between Android app data and visual evaluations. The advantages include more precise forecasting for road management and more timely and effective maintenance planning. The research results indicate that the Indeks Kondisi Perkerasan (IKP) for the AMD Lintas Timur Pandeglang road shows the highest percentage at 35% in the excellent rating, 23% in the very poor rating, 20% in the fair rating, 10% in the good and poor ratings, and 2% in the failed rating. The International Roughness Index (IRI) values yielded 72% in good condition, 20% in fair condition, 5% in severe damage condition, and 3% in slight damage condition. The equation obtained from both methods is: IKP = -0,824IRI^2 + 6,064IRI + 61,658 with R^2 = 0,245.
The effect of solvent type on the extraction of soybean crude oil and its laboratory-scale cost analysis Saputri, Desi Riana; Listyadevi, Yuniar Luthfia; Adiwibowo, Muhammad Triyogo; Alhanif, Misbahudin; Damayanti, Damayanti; Fahni, Yunita; Auriyani, Wika Atro; Sanjaya, Andri; Sufra, Rifqi; Yuniarti, Reni; Yusupandi, Fauzi; Syahriantoro, Nur Alfi; Kurniawansyah, Arief
Jurnal Teknika Vol 19, No 2 (2023): AVAILABLE ONLINE IN NOVEMBER 2023
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/tjst.v19i2.22059

Abstract

Soybeans (Glycine max) are a type of legume with moderately high fat content. Appropriate and safe types of solvents are essential in extracting fatty acids for consumption. This study aims to find an alternative solvent to replace n-hexane for extracting soybean oil and analyze its lab-scale production cost. Soybean oil was extracted by soxhlet extraction using ethanol, ethyl acetate, and n-hexane with a soybean-to-solvent ratio of 1:4 and 2:4 (w/v) and an extraction time of 1 and 2 hours. The results show that solvent polarity and soybean: solvent ratio affect the yield and density of the resulting extract. The greater the soybean-to-solvent ratio, the more oil is extracted until equilibrium. The highest yield was 36.25%, obtained at a material-to-solvent ratio of 2:4 (w/v) within 2 hours with ethyl acetate, and the oil density was 0.92 g/mL. The Gas Chromatography-Mass Spectrophotometry (GC-MS) analysis on the sample with the highest yield showed that the fatty acid composition was 34.36% linoleic acid, 22.12% palmitic acid, 19.40% stearic acid and 19.43% octadecadienoic acid. Ethyl acetate produces better yields and can be recommended as an alternative solvent to replace n-hexane for soybean oil extraction. The total extract production costs for 70% ethanol, 90% ethyl acetate, and 95% n-hexane solvents are IDR 780,847; 647,232; and 692,050, respectively. 
Contribution of nano crumb-rubber to the rheological characteristics of modified buton rock asphalt Septiawan, Ahmad; Hadiwardoyo, Sigit Pranowo; Sumabrata, Jachrizal; Lumingkewas, Riana Herlina
Jurnal Teknika Vol 20, No 1 (2024): Available Online in June 2024
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/tjst.v20i1.23119

Abstract

The increasing number of overloaded vehicles on the highway is one of the factors causing damage to flexible pavements, especially at high temperatures. Therefore, investigating asphalt binders resistant to high temperatures is important. Many studies have been carried out on modifying asphalt with nanomaterials to increase the resistance of asphalt to rutting. One is research using nano crumb-rubber additive material as an asphalt binder variable. This research was carried out with different nano crumb-rubber content of 1.2%, 2.4%, 3.6%, and 4.8% added to pure asphalt binder pen 60/70 and Lawele Bitumen, resulting from extraction from the island of Buton. Rheological tests using the Dynamic Shear Rheometer were used to measure the value of the rutting factor (G*/sin δ) on pure asphalt binder and Asphalt Nano Crumb-Rubber Modified. The asphalt binder resistance to aging conditions can be seen from the aging index value. The results show that adding the percentage of nano crumb rubber to modified asphalt reduces the complex shear modulus (G*) value, the phase angle (δ), and the value of the aging index
Soil stabilization using eggshell powder and its effect on unconfined compressive strength (UCS) values Mina, Enden; Kusuma, Rama Indera; Fathonah, Woelandari; Vindo, Alberto Dwi
Jurnal Teknika Vol 20, No 1 (2024): Available Online in June 2024
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/tjst.v20i1.22565

Abstract

Soil in road pavement construction has an important role as the foundation for the structure supporting the load above it. The damage that occurs in road construction also often due to subgrade soil that does not have good bearing capacity, therefore soil reinforcement or stabilization is needed to improve its strength. The road section in Cibingbin Village, Cibaliung subdistrict, Pandeglang Regency was damaged due to a lack of soil bearing capacity, where through field CBR tests it was discovered that the CBR value of the soil was 3% less than required. Soil strengthening can be done by adding additional substances to the soil which can increase its strength and bearing capacity. Eggshell powder was chosen in this research as an additive to see its effect on soil strength. Soil strength is tested through unconfined compression stress (UCS) testing in the laboratory. Apart from that, the effect of adding eggshell powder on the physical properties of the soil was also studied. Variations in adding eggshell powder were taken in varying percentages 0%, 2%, 4%, 6%, 8%, 10%, 12% and 14%. The results of testing the physical properties of the soil showed that the original soil type was classified as organic clay with high plasticity (CH). The UCS test results on the original soil had a strength (qu) value of 1.6 kg/cm2, and the adding eggshell powder could increase the qu value which got optimum value at the percentage 12% eggshell powder with 0 and 3 days of curing of 2.851 kg/cm2 and 3.386 kg/cm2 respectively. It can be concluded that the addition of eggshell powder can increase the soil strength. The consistency of the clay soil changes to become stronger and based on the UCS value the clay soil becomes stiffer.
Simulation of extractive distillation for separating Acetonitrile-Toluene using Butyl Propionate as entrainer Prasetyo, Dwi Agus; Han, Sang-Wook; Shin, Kyung-Jun; Kim, Byung-Jick
Jurnal Teknika Vol 19, No 2 (2023): AVAILABLE ONLINE IN NOVEMBER 2023
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/tjst.v19i2.21906

Abstract

Acetonitrile is known as a polar solvent that can dissolve in non-polar hydrocarbon liquids. As an example of a nonpolar solvent, toluene is one of the solvents that dissolves well in acetonitrile. If acetonitrile and toluene are mixed, a minimum boiling azeotrope will form. The maximum purity of acetonitrile when distilled is 89.5% mole at 81.19 °C under conventional distillation. To achieve high purity of acetonitrile, a new solvent should be added to this mixture. In this work, high purity of acetonitrile (99.9% mass) with extractive distillation method was simulated using Aspen Plus software. Based on the pseudo-binary analysis by Aspen Plus, butyl propionate can break the azeotrope mixture at concentration of 0.3 (mole fraction). The simulation results showed that, to get 99.9% mass of acetonitrile, a solvent to feed ratio of 1.5, reflux ratio of 1.5 a number of stages of 32 were required. After obtained the optimum parameters, economic evaluation was calculated using total annual cost (TAC) objective function method. From the economic evaluation, a feasible TAC of 1.225×106 $/year was obtained.     

Page 29 of 32 | Total Record : 318

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