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QCM SENSOR SENSITIVITY ANALYSIS OF SILVER ELECTRODES COATED WITH LIPID MEMBRANE OLEYL ALCOHOL TOWARD NaCl AND HCl Ummah, Auliya Rahmatul; Tazi, Imam; Muthmainnah, Muthmainnah
Jurnal Neutrino Vol 11, No 2 (2019): April
Publisher : Department of Physics, Maulana Malik Ibrahim State Islamic University of Malang

One of the sensors, which is currently being developed is the QCM sensor. The QCM sensor is a sensor that utilizes the frequency change to detect a change in mass due to a test substance. The use of a QCM sensor includes other forms of electronic tongue sensor that can distinguish five basic flavours on the tongue. QCM sensor can also be varied electrodes using various lipid membranes such as electronic tongues to increase sensor sensitivity. This research aims to determine the sensitivity of the QCM sensor before and after coated with the lipid membrane to NaCl and HCl. The sensitivity of the QCM sensor to NaCl is 1.47 Hz/M for uncoated sensor and 0.63 Hz/M for coated sensor, while the sensitivity of HCl is 4.55 Hz/M for uncoated sensor and 4.93 Hz/M for coated sensor. The difference of the results is caused by the nature of ionization of the compound and the amount of concentration used. The result of the sensitivity research shows that the QCM sensor with Oleyl Alcohol lipid membrane is more sensitive to HCl than NaCl.

Ethanol additive addition to gasoline: viscosity investigation using stokes law linear regression Taufik Ulhakim, Muhamad; Karina Chintya, Lestari; Suhara, Ade; Bertolomeus Haryanto, Agung; Ummah, Auliya Rahmatul; Nur, Arip Syaripudin
Jurnal Teknik Mesin Mechanical Xplore Vol 4 No 1 (2023): Jurnal Teknik Mesin Mechanical Xplore (JTMMX)
Publisher : Mechanical Engineering Department Universitas Buana Perjuangan Karawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36805/jtmmx.v4i1.5612

Nowadays, global warming is a tremendous phenomena in the world. Every country trying to solve these conditions, including Indonesia that has a campaign to reduce the emission of CO and HC from vehicles. However, the number of vehicles is increasing every year. Based on that condition, the researchers are trying to modify the fuel with the additive. This work modified the gasoline with 10% ethanol additive addition and investigated the viscosity properties using Stokes law linear regression method and compared to pure gasoline. The viscosity properties are chosen by their effect on emission of vehicles. A low viscosity of fuel can reduce CO and HC in gas emission. Then, this work was finding that the viscosity of gasoline is decreased, but 10% of ethanol does not significantly change the characteristics of gasoline. Even so, the linear regression has successfully used as an analyzed method to determined the viscosity. Then, this finding also contributes to development of fuel in Indonesia to reduce the emission of CO and HC with the modified of gasoline using ethanol in the other concentration.

Unraveling the Potential of Coconut Shell Activated Carbon for Catalytic Converter Application: A Preliminary Studies of its Optimization through the Assisted of Fuzzy Logic Taufik Ulhakim, Muhamad; Marbun, Diansyah; Sukarman, Sukarman; Supriyanto, Agus; Suhara, Ade; Ummah, Auliya Rahmatul; Lidiawati, Neng Astri
Jurnal Teknik Mesin Mechanical Xplore Vol 5 No 2 (2024): Jurnal Teknik Mesin Mechanical Xplore (JTMMX)
Publisher : Mechanical Engineering Department Universitas Buana Perjuangan Karawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36805/jtmmx.v5i2.9013

Nowadays, researchers focus on developing catalytic converters based on activated carbon (AC) from organic waste to address environmental concerns. This study presents a preliminary investigation into the application of catalytic converters through the synthesis of AC from coconut shells, with optimization achieved through the implementation of fuzzy logic to ascertain the optimal properties of the AC, specifically the activation temperature. The fuzzy logic approach has determined that the optimal activation temperature is 950 °C. The effectiveness of this approach is substantiated by the successful synthesis of AC, as evidenced by XRD, FTIR, and SEM-EDX analysis. The findings indicate that fuzzy logic provides the most accurate activation temperature information, significantly impacting the AC structure. The resulting yield and bulk density values were 26.29% and 0.519 g/ml, respectively. Proximate analysis indicates that the ash content (4.332%), moisture (7.211%), and volatile matter (16.321%) achieve an FCC of 72.136%. The iodine number is a crucial parameter in evaluating the potential application of AC for the catalytic converter. The results demonstrated that the adsorption performance is achieved in 613 mg/g. In conclusion, the AC produced shows considerable potential for use as a catalytic converter. This assertion is substantiated by the successful evaluation of its efficacy in reducing CO and HC, respectively, by approximately 86.04% and 56.79%. To confirm the suitability of the catalytic converter for the vehicle. A series of dynamometer tests were conducted to verify the catalytic converter's performance. The ensuing test results exhibited a decline in torque and power values, yet these measurements remained within acceptable parameters for typical daily utilization.

PELATIHAN SOFTWARE SIMULASI ELEKTRONIKA TINKERCAD UNTUK GURU FISIKA SMA KOTA SAMARINDA DAN SEKITARNYA Nurhanafi, Kholis; Zarkasi, Ahmad; Putri, Erlinda Ratnasari; Putri, Devina Rayzi Perwitasari Sutaji; Syahrir, Syahrir; Ummah, Auliya Rahmatul
Mitra Mahajana: Jurnal Pengabdian Masyarakat Vol. 6 No. 1 (2025): Volume 6, Nomor 1 Maret 2025
Publisher : LPPM Universitas Flores

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37478/mahajana.v6i1.4935

School learning demands an optimal learning experience to fulfill the learning outcomes. At the Senior High School level, several science topics, particularly physics, require simulations to enhance students' understanding. A community service initiative was carried out in the form of training on using TinkerCad electronics simulation software for high school physics teachers in Samarinda and its surrounding areas. This activity aimed to provide physics teachers with alternative teaching media, particularly for the topic of electronics at the high school level. The training was attended by 21 participants and conducted using lectures, demonstrations, and mentoring methods. Based on the interview results, the majority of participants were unfamiliar with the TinkerCad software, making this training a valuable new resource for high school physics teachers in Samarinda and the surrounding regions.

Ethanol additive addition to gasoline: viscosity investigation using stokes law linear regression Taufik Ulhakim, Muhamad; Karina Chintya, Lestari; Suhara, Ade; Bertolomeus Haryanto, Agung; Ummah, Auliya Rahmatul; Nur, Arip Syaripudin
Jurnal Teknik Mesin Mechanical Xplore Vol. 4 No. 1 (2023): Jurnal Teknik Mesin Mechanical Xplore (JTMMX)
Publisher : Mechanical Engineering Department Universitas Buana Perjuangan Karawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36805/jtmmx.v4i1.5612

Nowadays, global warming is a tremendous phenomena in the world. Every country trying to solve these conditions, including Indonesia that has a campaign to reduce the emission of CO and HC from vehicles. However, the number of vehicles is increasing every year. Based on that condition, the researchers are trying to modify the fuel with the additive. This work modified the gasoline with 10% ethanol additive addition and investigated the viscosity properties using Stokes law linear regression method and compared to pure gasoline. The viscosity properties are chosen by their effect on emission of vehicles. A low viscosity of fuel can reduce CO and HC in gas emission. Then, this work was finding that the viscosity of gasoline is decreased, but 10% of ethanol does not significantly change the characteristics of gasoline. Even so, the linear regression has successfully used as an analyzed method to determined the viscosity. Then, this finding also contributes to development of fuel in Indonesia to reduce the emission of CO and HC with the modified of gasoline using ethanol in the other concentration.

Unraveling the Potential of Coconut Shell Activated Carbon for Catalytic Converter Application: A Preliminary Studies of its Optimization through the Assisted of Fuzzy Logic Taufik Ulhakim, Muhamad; Marbun, Diansyah; Sukarman, Sukarman; Supriyanto, Agus; Suhara, Ade; Ummah, Auliya Rahmatul; Lidiawati, Neng Astri
Jurnal Teknik Mesin Mechanical Xplore Vol. 5 No. 2 (2024): Jurnal Teknik Mesin Mechanical Xplore (JTMMX)
Publisher : Mechanical Engineering Department Universitas Buana Perjuangan Karawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36805/jtmmx.v5i2.9013

Nowadays, researchers focus on developing catalytic converters based on activated carbon (AC) from organic waste to address environmental concerns. This study presents a preliminary investigation into the application of catalytic converters through the synthesis of AC from coconut shells, with optimization achieved through the implementation of fuzzy logic to ascertain the optimal properties of the AC, specifically the activation temperature. The fuzzy logic approach has determined that the optimal activation temperature is 950 °C. The effectiveness of this approach is substantiated by the successful synthesis of AC, as evidenced by XRD, FTIR, and SEM-EDX analysis. The findings indicate that fuzzy logic provides the most accurate activation temperature information, significantly impacting the AC structure. The resulting yield and bulk density values were 26.29% and 0.519 g/ml, respectively. Proximate analysis indicates that the ash content (4.332%), moisture (7.211%), and volatile matter (16.321%) achieve an FCC of 72.136%. The iodine number is a crucial parameter in evaluating the potential application of AC for the catalytic converter. The results demonstrated that the adsorption performance is achieved in 613 mg/g. In conclusion, the AC produced shows considerable potential for use as a catalytic converter. This assertion is substantiated by the successful evaluation of its efficacy in reducing CO and HC, respectively, by approximately 86.04% and 56.79%. To confirm the suitability of the catalytic converter for the vehicle. A series of dynamometer tests were conducted to verify the catalytic converter's performance. The ensuing test results exhibited a decline in torque and power values, yet these measurements remained within acceptable parameters for typical daily utilization.

Arduino Uno Based Automatic Fruit Maturity Detection System for Orange (Citrus sp.) and Bell Fruits (Syzygium aqueum) Using Electrical Conductivity Ummah, Auliya Rahmatul; Fitriani, Ade; Nur Hanafi, Kholis; Syahrir, Syahrir; Supriyanto, Supriyanto; Zarkasi, Ahmad
Lontar Physics Today Vol 4, No 3 (2025): November 2025
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/lpt.v4i3.25513

Accurate determination of fruit ripeness is essential to maintain product quality, flavor, and market value. However, traditional manual assessment methods, which rely on sensory observation (color, aroma, and texture), are often subjective and inconsistent. This study aims to design and develop an automatic fruit ripeness detection system based on electrical conductivity measurement in oranges and bell fruits. The system utilizes a three-electrode stainless steel needle probe connected to an ADS1115 Analog-to-Digital Converter (ADC) module and an Arduino Uno microcontroller. A refractometer was used for system calibration and reference data acquisition. Measurements were performed by inserting the probe into the fruit pulp to read the voltage value of the fruit's fluid. This electrical signal was correlated with the reference sugar content (%Brix) and subsequently classified into three categories: ripe, half-ripe, and unripe. Results show that the average voltage range for oranges in the ripe, half-ripe, and unripe categories was 2.74 V, 2.58 V, and 2.32 V, respectively. For bell fruits, the corresponding voltage ranges were 2.48 V, 2.26 V, and 2.08 V. These voltage values were derived from the experimental data presented in Table 1 and Table 2. The abstract reports the average voltage for each ripeness category, whereas the tables list individual measurement values, resulting in slight differences between the summarized and detailed data. The average relative error of the measurement was found to be approximately 5 %, which is considered acceptable for practical field application. This indicates that the developed system is capable of classifying fruit ripeness in a non-destructive, accurate, and rapid manner.

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