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International Journal of Applied Technology Research
Published by Politeknik Negeri Bandung
ISSN : -     EISSN : 27217582     DOI : https://doi.org/10.35313/ijatr
Core Subject : Science, Engineering,
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics
This journal is intended to foster and stimulate the exchange of discourses on applied technology research issues among professionals and academics throughout the world. IJATR welcomes articles in all areas of engineering and technology research, both applied and theoretical. In case of theoretical article, it must provide a clear link to some important and interesting engineering and technology applications.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 75 Documents
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The Effect of Maltodextrin Concentration and Drying Temperature on the Instant Coffee Production with Spray Drying Method Hariyadi, Tri
Jurnal Internasional Penelitian Teknologi Terapan Vol 5 No 3 (2024): October 2024
Publisher : Bandung State Polytechnic (Politeknik Negeri Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/ijatr.v5i3.193

Abstract

The operating temperature and the addition of fillers such as maltodextrin had a valuable effect on the quality of instant coffee production. Based on this, the purpose of this research is to determine the effect of maltodextrin concentration and operating temperature on the quality of instant coffee powder produced by the spray drying method. The variation of operating temperature was conducted in the range of 120 to 170⁰C without the addition of maltodextrin, and the variation of maltodextrin concentration was conducted in the range of 5% to 35% (w/v) with the optimum operating temperature at the lowest water content. The observed quality parameters of the coffee were yield, moisture, ash, caffeine content, and organoleptic tests. The optimum operating temperature was 140⁰C with a moisture content of 5.17% (w/w). The best instant coffee quality was achieved with a 15% concentration of maltodextrin, with a yield of 50.49%, a moisture content of 3.94% (w/w), an ash content of 6.66% (w/w), and a caffeine content of 5.16% (w/w). Based on the organoleptic test, the coffee sample with 15% maltodextrin had a brownish color, a moderately strong aroma, was moderately bitter, and was liked by the panelists.
Impact of Cathode Variations on the Mechanical Properties of Hard Anodizing in Sulfuric Acid 15% and Phosphoric Acid 1% Sihombing, Rony Pasonang
Jurnal Internasional Penelitian Teknologi Terapan Vol 5 No 3 (2024): October 2024
Publisher : Bandung State Polytechnic (Politeknik Negeri Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/ijatr.v5i3.194

Abstract

Aluminum 1100 could be used as domestic appliances material, especially on kitchen equipment. The purpose of this research was to improve the properties of aluminum 1100. In order to improve the physical and mechanical properties, a hard anodizing process was conducted. In the hard anodizing process, 1100 aluminum workpieces are sanded, decreased in alkaline solution and neutralized in acidic solution. The hard anodizing process is carried out by placing the workpiece on the positive pole and the electrode on the negative pole (cathode) of the direct current source. The hard anodizing process of 1100 aluminum alloy was carried out in a mixture of 15% sulfuric acid and 1% phosphoric acid solution, current density of 3A/dm2, anodizing time of 30 minutes, temperature of 5 °C, and cathode variation (Al and Pb). The results showed the formation of an oxide layer on the metal surface consisting of two types of layers, called the barrier layer and the porous layer. The barrier layer has no pores because it has conductive microstructure properties and reaches the maximum thickness. The porous layer formed can increase the overall thickness of the oxide layer, while the barrier layer remains a constant thickness and increases the hardness level of the aluminum. This study resulted in a process efficiency of 83.04% with the best oxide layer thickness of 11.43 μm and the highest hardness of 144.25 HVNoxide layer thickness of 11.43 μm and the highest hardness of 144.25 HVN.
The Effect of Aging on AC-BC Asphalt Mixture with Molasses as a Substitute for Asphalt Fadilah, Linda Winarni
Jurnal Internasional Penelitian Teknologi Terapan Vol 5 No 3 (2024): October 2024
Publisher : Bandung State Polytechnic (Politeknik Negeri Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/ijatr.v5i3.195

Abstract

Asphalt aging is one of the causes of quality deterioration in flexible pavement. Previous studies have shown that molasses can be used as a substitute for asphalt. This study uses molasses at 15% of the asphalt weight. Aging tests were conducted on AC-BC asphalt mixtures, which are intermediate layers often used in areas with high deformations. Asphalt aging occurs in both short and long terms. Short-term aging occurs during mixing, tested using Short-Term Oven Aging (STOA), while long-term aging occurs during service life, tested using Long-Term Oven Aging (LTOA). STOA testing involves heating the loose mixture in a laboratory oven for 4 hours at 135°C, while LTOA involves heating solid specimens in a laboratory oven for 2 days and 5 days at 85°C. The test results indicate that aging affects the characteristics of asphalt mixtures, as evidenced by an increase in Void in Mixture (VIM) and Void in Mineral Aggregate (VMA) values, while stability, flow, Void Filled with Bitumen (VFB), and density values tend to decrease. The test results also show that HMA AC-BC +15% Molasses is better at maintaining stability values, as evidenced by the higher stability value of HMA AC-BC + 15% Molasses compared to HMA AC-BC Control.
Design of Pavement Structure Based on An Empirical Mechanistic Design Approach for Roads with AC-WC Asphalt Mixture Using Buton Granular Asphalt (BGA) and Modifiers Salsabilla, Deshafa
Jurnal Internasional Penelitian Teknologi Terapan Vol 5 No 3 (2024): October 2024
Publisher : Bandung State Polytechnic (Politeknik Negeri Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/ijatr.v5i3.196

Abstract

Indonesia relies heavily on imported asphalt, consuming around 5 million tons per year, despite having substantial domestic buton granular asphalt (natural asphalt) deposits of up to 662 million tons. This research aims to analyze the potential of using buton granular asphalt B 50/30 (ASB) and a liquid asphalt modifier (SC70) as additional materials in AC-WC asphalt mixtures (AC-WC+ASB+SC70), evaluate the empirical-mechanistic design correlation, and determine flexible pavement design based on MDP 2017 method from Ministry of Public Work and Housing, Indonesia. The study employed laboratory testing using Marshall and UMATTA methods. The results showed that with the estimated bitumen content (Pb) 6%, the optimum asphalt modifier content (OMC) was 2.3%, and the UMATTA test indicated the Smix value of AC-WC+ASB+SC70 was 1202 MPa at 20°C, exceeding the typical AC-WC value of 1100 MPa. The flexible pavement design comprised a 4 cm AC-WC layer, 6 cm AC-BC layer, 18 cm AC-Base layer, and 30 cm of LPA. The findings suggest that the use of ASB and SC70 can effectively extend pavement service life. The higher the asphalt mixture's modulus value (Smix), the better the flexible pavement performance. This approach offers a sustainable solution to Indonesia's reliance on imported asphalt, leveraging its abundant domestic BGA resources.
Design and Simulation of Electronic Load Controller with DC Dummy Load on Run Off River Type Micro Hydro Power Plant Mardiyanto, Ignatius
Jurnal Internasional Penelitian Teknologi Terapan Vol 5 No 3 (2024): October 2024
Publisher : Bandung State Polytechnic (Politeknik Negeri Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/ijatr.v5i3.197

Abstract

Micro-hydro power plants are widely installed for electricity in rural areas with power quality is often an issue. In micro-hydro power plants with the Runoff River type, an electronic dummy load controller (ELC) is frequently used to control the frequency system. A dummy load can be either an Alternating Current (AC) or a Direct Current (DC). The principle of dummy load control is to make the output power always constant at the nominal power of the generator. The generator output power is steady when the consumer is changed, coupled with the dummy load. This research article is focused on a simulation of ELC settings with a DC Dummy Load so that the frequency and voltage on the generator side become relatively constant. This article also shows the effect of DC dummy load on generator power quality. The design of ELC Dummy Load DC is a 4-bit combination load with 16 different current values. The simulation running results illustrate the ability of the Dummy Load to maintain a voltage value of about 380 Volts and a frequency of 50 Hz. Therefore, it can be said that the generator output power quality due to the use of ELC Dummy Load DC control is not sufficient in the quality of the produced power. Total Demand Distortion (TDDi) and Total Harmonics Distortion (THDv) are up to 20%

Page 8 of 8 | Total Record : 75

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