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INDONESIA
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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Effect of ultraviolet exposure and palm fibre/fibreglass direction on composite Tri Partuti; Muhammad Iqbal Bariq; Yanyan Dwiyanti; Adhitya Trenggono; Erlina Yustanti
Jurnal Teknika Vol 18, No 2 (2022): Available Online in November 2022
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/tjst.v18i2.16957

Abstract

Composite can be used as an alternatif material to replace items made of wood. Wood usually not resist to water and prone to weathering in outdoor application. Composite is expected to overcome the weakness of wood. This research aims to make composite with different direction of palm fibre/fibreglass as filler and unsaturated polyester resin as matrix with hand lay-up method, also to find out whether its suitable for outdoor application or not. Ultraviolet (UV) exposure is one of element at outdoor environment that can damage polymer matrix composite. UV exposure for 1, 2 and 3 months was carried out on composites with different palm fibre directions: unidirectional, bidirectional and random. To find significant relationship between fibre direction and tensile strength, and also UV exposure time and tensile strength, correlation test was carried out using SPSS. The result shows that before UV exposure, tensile strength of composite with random, unidirectional and bidirectional palm fibre were 29.97 MPa, 28.53 MPa, and 20.92 MPa, respectively. After 3 months UV exposure, mass of composite with random, unidirectional, and bidirectional palm fibre decreased by 1.14%, 1.34%, and 1.39%, respectively. The correlation test showed that there was no significant correlation between palm fibre directions and tensile strength, and also time of UV exposure and tensile strength with correlation coefficients (r) = -0.504 and -0.237, respectively. Composite colour changed become more faded after 3 months UV exposure. Intensity change of FTIR spectra showed the degradation of composite at wave number about 1750-1725 cm-1, 1230–1260 cm−1 and 700 cm−1. Based on its tensile strength, composite can replace wood with PKKI NI-5 2002 standard for quality code E14 (for unidirectional and bidirectional palm fibre) and E12 (for random palm fibre). Aesthetically, the fading of the composite colour after 3 months UV exposure indicates that composite is not suitable for outdoor application yet.
Proposed production process improvement with a lean manufacturing approach on the electrolytic tinning line Evi Febianti; Ade Irman S Mutaqin; Firdha Tamia Puteri; Shanti Kirana Anggraeni; Nuraida Wahyuni; Ratna Ekawati; Ani Umyati
Jurnal Teknika Vol 18, No 2 (2022): Available Online in November 2022
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/tjst.v18i2.14730

Abstract

Industry competition is currently getting tighter; companies must produce quality products, deliver on time, and provide the best service to consumers. It can be real realized minirealisedaste that occurs in the production process to achieve this. In this study, lean manufacturing will be applied to minimize waste by describing the entire production process through Value Stream Mapping, identifying the most dominant waste using the Waste Assessment Model (WAM) method, and selecting VALSAT tools based on final weights. WAM, identification of causes using Fishbone diagrams, and suggestions for improvement using 5 Whys Analysis. The results show that waste is dominant, namely waste defect with a percentage of 21.66% and waste inventory of 20.34%. Proposed improvements made to reduce waste defects a traditional singing the contaminant inspection method, conducting regular inspections, and cleaning machine parts, changing the coating thickness gradually, providing training to operators regarding the handling of the process section, and adding a thermometer near the steam supply. Meanwhile, to reduce inventory waste, namely by including the storage date limit on the Tin Mill Black Plate (TMBP) raw material, rearranging the TMBP storage area, conducting periodic TMBP inspections, and providing training and direction to operators regarding the TMBP transfer process.
Clean water projection of Serang City, Banten Province Restu Wigati; Woelandari Fathonah; Hendrian Budi Bagus Kuncoro; Heri Mulyono
Jurnal Teknika Vol 18, No 2 (2022): Available Online in November 2022
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/tjst.v18i2.16819

Abstract

Indonesia is predicted to experience a deficit in groundwater availability in 2040, covering urban areas, including Serang City. The increasing urban population has become a new burden on the water supply, which has been relying on groundwater. Pandemic Covid-19 adds new challenges while simultaneously realizing the need for aspects of clean and healthy living behavior to minimize the potential for spreading the virus. Based on these conditions, it is necessary to conduct a study related to the projection of the need and availability of clean water in Serang City until 2031, as well as efforts to anticipate the fulfillment of clean water, and solutions to problems, especially in urban areas through sustainable development related to the need for clean water that is environmentally friendly and has a concept of environmental sustainability. Based on the analysis results, it is obtained that the projected clean water needs of Serang City for domestic and non-domestic clean water needs and the need for clean water that can be treated are insufficient. The clean water production capacity of PDAM Tirta Albantani and PDAB Tirta Madani, a supplier of clean water in Serang City, is not yet optimal, so it needs new technology; the concept of the City cares about clean water using nature-based technology.
Early detection of sick chicken using artificial intelligence Widyawati Widyawati; Waliadi Gunawan
Jurnal Teknika Vol 18, No 2 (2022): Available Online in November 2022
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/tjst.v18i2.17337

Abstract

According to survey of BPS, in 2020 meat consumption especially poultry has reached 4 million tons per year or equivalent to 35% of total meal consumption. Every year the production and productivity of meat especially poultry has been increasing significantly. However, with such a large production volume, most of the process in poultry industry such as feeding, quality inspection, vaccine injection and sick detection in Indonesia still performed with human intervention. This process, like other manual activities, is very labor intensive, time consuming, and prone to inconsistencies and inaccuracies. This research is focus on early sick detection in poultry industry especially chicken farm. A delay in the sick detection stage can result in high economic losses for farmer. The automation process using computer vision technology is expected to reduce costs, increase efficiency and accuracy by applying the YOLOv5 algorithm. Based on the results of the study, conducted to 4333 feces images it was found that at the testing stage, the best average level of accuracy obtained was 89.2%.
Utilization of fly ash and bottom ash to increase the value of unconfined compression strength on subgrade Woelandari Fathonah; Rama Indera Kusuma; Enden Mina; Restu Wigati; Dwi Esti Intari; Nada Shafa Soraya Gandakusumah
Jurnal Teknika Vol 18, No 2 (2022): Available Online in November 2022
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/tjst.v18i2.16307

Abstract

Soil is the most important part to support all traffic loads or construction loads placed on it. Soils that have low bearing capacity, such as clay, need stabilization techniques to increase the carrying capacity of the soil. One of the stabilization techniques is to mix the soil with Fly ash and Bottom ash. The purpose of this study was to determine the effect of Fly ash and Bottom ash on the physical properties of the soil and the value of unconfined compression strength test. The variations of Fly ash and Bottom ash used were Fly ash 0% and 20% and variations of Bottom ash 0%, 10%, 20% and 30% with curing time of 0, 7, 14 and 28 days. Soil is classified according to the Unified Soil Classification System (USCS) method. The results showed that the soil classification was classified as OH, namely organic clay with high plasticity of 21.08%. The results of the unconfined compression strength test show that the addition of fly ash and bottom ash increases the qu value of the clay soil. The optimum qu value was obtained at variation B (Bottom ash 10% and Fly ash 20%) with 28 days curing time of 2,994 kg/cm2. The decrease in the value of qu occurred in variation C (Bottom ash 20% and Fly ash 20%) and variation D (Bottom ash 30% and Fly ash 30%). Soil with the addition of 0% and 20% Fly ash and Bottom ash at variations of 0%, 10%, 20% and 30% showed a decrease in the value of the soil plasticity index from 21.083% to 7.511%.
Degradation of methyl ester sulfonate using TiO2 photocatalyst Muhammad Triyogo Adiwibowo; Ahmad Sukarya; Fauzi Ramdani Aryanto Putra; Marta Pramudita; Rudi Hartono; Alia Badra Pitaloka
Jurnal Teknika Vol 18, No 2 (2022): Available Online in November 2022
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/tjst.v18i2.16940

Abstract

One common domestic waste in the waters is detergent residue due to the daily habit of washing clothes. Thus, wastewater treatment is needed to purify the water. One of the methods is photocatalytic degradation. In this study, TiO2 nanoparticles were used to degrade methyl ester sulfonate (MES), one of the raw materials for making detergents. This study aims to investigate the effect of TiO2 concentration, reaction time, and light source on the MES degradation. The variations of the degradation tests included photocatalyst concentrations of 0.5, 1, and 1.5 mg/L, irradiation times of 1, 2, and 3 hours, and UV lamps and sunlight. The residual surfactant in water was analyzed using the Methylene Blue Active Surface (MBAS) method. The principle of this method is that MES will bind to methylene blue to form a complex blue compound so that its concentration can be quantified using a UV-Vis spectrophotometer. This study showed that the higher photocatalyst concentration increased the surfactant degradation from 11.97% to 33.91%, and the longer the degradation time, the more surfactant was degraded up to 41.56% after 3 hours. The sunlight source produces 55.72% degradation, more than a 10-watt UV lamp. The MES degradation follows the second-order reaction equation with a rate constant of 0.0963 L/mg.hour.
The monitoring process of column flotation using ECVT system with the effect of percent solid and frother dosage to recovery Soesaptri Oediyani; Didied Haryono; Mira Elisabeth; Rahman Faiz Suwandana
Jurnal Teknika Vol 19, No 1 (2023): Available Online in June 2023
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/tjst.v18i2.16693

Abstract

Flotation is a separation process that exploits differences in the surface properties of minerals and their impurities when exposed to a solution medium. To effectively observe and monitor the flotation process, Electrical Capacitance Volume Tomography (ECVT) has emerged as a valuable monitoring technology. By employing ECVT, the performance of flotation can be successfully monitored, particularly in relation to the dosage of frother and the percentage of solids. In this study, a laboratory-scale flotation column, equipped with 32 capacitance sensors located in the collection zone section, was employed to facilitate the monitoring process. The measurements of capacitance values were conducted at level 5, which represents the steady-state region of the flotation process. By varying the dosage of frother and the percentage of solids, the study explored the impact of these variables on the flotation performance. The experiments encompassed different solid percentage variations, including 7.5%, 10%, 12.5%, and 15% solid, in conjunction with varying frother dosages of 10, 20, 30, 40, and 50 ppm. The experimental results demonstrated that both the recovery and the signal capacitance exhibited a tendency to increase up to a maximum point as the frother dosage and solid percentage were varied. Notably, the changes in the signal capacitance and recovery displayed a parallel pattern, which was further confirmed through the three-dimensional images obtained using ECVT. These images visually depicted alterations in color concentration in accordance with the variations in frother dosage and solid percentage. The study identified the lowest recovery of 12.34% under the condition of a 10 ppm frother dosage and 12.5% solid, corresponding to a capacitance value of 1.177. Conversely, the highest recovery achieved was 49.91% when using a 40 ppm frother dosage and 15% solid, with a corresponding capacitance value of 1.270. 
Analysis of magnetic field magnitude under the extra-high-voltage airway (SUTET) with route of Cilegon - Cibinong Retno Hadi Winoto; Jayanudin Jayanudin; Nuryoto Nuryoto
Jurnal Teknika Vol 18, No 2 (2022): Available Online in November 2022
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/tjst.v18i2.17118

Abstract

Today, electricity is a very important need so the demand for electricity increases in the world. To meet the electricity needs of the community, the Indonesian government through the state electricity company (PT. PLN) has built electric power networks starting from power plants to transmission lines that can supply electricity to consumers. To reduce power losses along the transmission lines, extra-high-voltage (EHV) is needed. However, the use of this EHV also produces electric and magnetic fields around the conducting wires. This causes anxiety for people, especially people who live in the areas of EHV Airways. The large magnetic field around the conductor wires is feared to have a detrimental impact on people who live near transmission lines. The threshold for the value of the magnetic field that is permitted according to the regulations of MENKES/SK/XI/2002 and SPLN 112:1994 is 500 μT. For this reason, this research was conducted to determine the magnitude of the magnetic field around the conductor wires of the EHV Airway and to determine the effect of the magnetic field on the environment. The methods used in this research were direct measurements and theoretical calculations. The results of the research prove that the value of the magnetic field that appears, both in terms of calculations and in terms of measurements, is still below the allowable threshold both by WHO and IRPA as well as by MENKES/SK/XI/2002 and SPLN 112:1994
Toxicity and molecular docking approach phenolic extract of Crescentia cujete L against the enzymes glutathione peroxidase and cathepsin K Herayati Herayati; Agus Rochmat; Lia Nurliana; Meri Yulvianti; Yeyen Maryani; Ahmad Hariri; Suaedah Suaedah
Jurnal Teknika Vol 18, No 2 (2022): Available Online in November 2022
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/tjst.v18i2.16658

Abstract

Osteoporosis is a metabolic bone disease characterized by a decrease in bone mass, caused by a reduction in bone matrix and minerals accompanied by microarchitectural deterioration of bone tissue. Factors such as hormone production, the aging process, and the formation of free radicals due to oxidative stress by Reactive Oxygen Species (ROS) can stimulate bone resorption. The content of secondary metabolite compounds in Crescentia cujete L. has medicinal properties for diseases. Purpose: this study was to determine the phenolic compound of Crescentia cujete L which has acted as an anti-osteoporosis with the approach of docking in silico. Extraction and partitioning of Crescentia cujete L fruit extracts in this study used n-hexane and toluene solvents with the aim of obtaining phenolic group compounds, knowing the toxicity value of partition results, obtaining the structure of phenolic compounds that have the potential to be anti-osteoporosis, and validating the ability of these phenolic compounds as anti-oxidants. As a result, n-hexane and toluene extracts are known to contain elevated levels of active and toxic compounds with LC50 values of 31.79 ppm and 93.49 ppm, respectively. The phytochemical test shows the presence of phenolic groups with maximum wavelengths at 302-320 nm. Benzene acetate, trans-cinnamic acid, and propanoic acid have the lowest affinity bonds with receptor 2F8A (Glutathione peroxidase); -4.21, -4.81, and -4.72 kcal/mol. Whereas at the 3KWZ receptor (Cathepsin K); -6.0, -5.4, and -5.0 kcal/mol. Conclusion: The phenolic compound of Crescentia cujete extract L can be used as an alternative treatment for osteoporosis by inhibiting the enzymes Glutathione peroxidase and Cathepsin K
Reduction of specific energy consumption (SEC) in cement factories through FMEA and energy management Muktar, Ridwan; Pratoto, Adjar
Jurnal Teknika Vol 19, No 1 (2023): Available Online in June 2023
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/tjst.v19i1.20225

Abstract

The cement industry is one of the energy-intensive industries with energy costs reaching 35% - 50% of the total production costs. The main energy sources in cement plants are coal and electricity. Energy use performance can be seen from the specific energy consumption (SEC) of the factory concerned. This paper discusses the possibility of decreasing SEC in a cement production unit with a capacity of 7800 tons per day. The plant operates using a dry process with a calciner and a 4-stage cyclone preheater. The study focuses on three process lines, namely the raw mill process, the kiln & coal mill process, and the finish mill process. The results of the energy audit showed that the performance of the raw mill process line is still close to the design price. Meanwhile, for the kiln & coal mill process line and the finish mill process line, the performance is below the design price. The Failure Mode Effect Analysis (FMEA) method is used to analyze the causes of the high SEC value of each process series. Based on the results of the FMEA, recommendations are given to reduce SEC, and the potential for SEC reduction is estimated at 14.93 kWh/ton of cement.  

Page 26 of 32 | Total Record : 318

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