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Penentuan momen inersia bola pejal menggunakan sensor gyroscope MPU6050 dan sensor photodioda Pratiwi, Umi; Maulita, Ika; Adi, Efita Pratiwi; Luthfia, Adilla
Jurnal Teras Fisika: Teori, Modeling, dan Aplikasi Fisika Vol 7 No 1 (2024): Jurnal Teras Fisika: Teori, Modeling, dan Aplikasi Fisika
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jtf.2024.7.1.12006

Abstract

Pengukuran momen inersia sebagai konsep penting dalam sistem kerja mesin yang memerlukan gerak rotasi, namun pengukuran secara manual belum menghasilkan hasil maksimal. Diperlukan perancangan sistem peraga penentuan Momen Inersia Bola Pejal Menggunakan sensor Mpu6050 Gyroscope Angle dan sensor photodioda untuk penentuan momen kelembaman bola pejal menggunakan berbasis sensor. Metode yang dilakukan dengan merancang sisten pengukuran momen inersia bola pejal, membuat flowchart prinsip kerja sistem, membuat flowchart sistem, dan perhitungan ketelitian. Variabel yang diperoleh berupa waktu tempuh bola pejal, panjang lintasan, dan sudut lintasan bidang miring. Data yang diperoleh berupavariasi panjang lintasan 2
PENGUKURAN VISKOSITAS OLI DAN MINYAK GORENG MENGGUNAKAN SENSOR MINI REED SWITCH MAGNETIC BERBASIS ARDUINO Pratiwi, Umi; Luthfia, Adilla
ORBITA: Jurnal Pendidikan dan Ilmu Fisika Vol 9, No 2 (2023): November
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/orbita.v9i2.17342

Abstract

ABSTRAKViskositas merupakan sifat penting dalam banyak aplikasi industri seperti minyak, cat, adhesif, dan bahan kimia. Kualitas bahan material sebagai bahan baku industri memerlukan kualitas yang baik seperti sifat viskositas. Diperlukan sebuah alat pengukuran yang efektif dan presisi dalam mengetahui kualitas bahan berdasarkan sifat viskositasnya. Salah satunya pengukuran berbasis digital dan mikrokontroler. Penelitian ini bertujuan untuk merancang alat peraga viskositas yang dilengkapi dengan sensor mini reed switch magnetic berbasis Arduino. Alat peraga ini menggunakan sensor mini reed switch magnetic sebagai detektor pergerakan bola baja di dalam tabung. Sensor ini menghasilkan sinyal yang dikirim ke Arduino, kemudian mengolah data dan menampilkan nilai viskositas pada layar LCD. Metode penelitian ini menggunakan penelitian eksperimen berbasis laboratorium  dengan melakukan karakterisasi viskositas skala laboratorium menggunakan lima larutan  fluida yaitu air, minyak goreng bekas, minyak goreng baru, oli bekas dan oli baru. Sampel viskositas dimasukkan ke dalam tabung, dan bola baja ditempatkan di dalam larutan. Motor stepper kemudian menggerakkan bola baja dengan kecepatan yang ditentukan, dan sensor reed switch magnetic mendeteksi pergerakan bola tersebut. Data yang diperoleh dari sensor dikirim ke Arduino, diolah, dan hasil viskositas ditampilkan pada layar LCD. Hasil pengukuran besar nilai viskositas fluida air, minyak goreng bekas, minyak goreng baru, oli bekas, dan oli baru berturut-turut menghasilkan (satuan Pa.s) 2,12; 3,18; 2,84; 3,52; dan 7,71. Hasil pengujian menunjukkan bahwa alat peraga viskositas ini mampu memberikan hasil yang akurat dan konsisten dalam mengukur viskositas larutan fluida dengan rata-rata eror 7,425% dibandingkan dengan alat peraga viskositas konvensional. Alat peraga ini juga dapat digunakan untuk mengukur viskositas berbagai jenis cairan dengan penyesuaian parameter yang sesuai. Kata kunci: viskositas fluida; sensor mini reed switch magnetic. ABSTRACTViscosity is an important property in many industrial applications such as oils, paints, adhesives, and chemicals. The quality of materials as industrial raw materials requires good quality such as viscosity properties. An effective and precise measurement tool is needed to determine the quality of materials based on their viscosity properties. One of them is digital and microcontroller based measurements. This research aims to design a viscosity demonstration tool equipped with an Arduino-based magnetic mini reed switch sensor. This teaching aid uses a mini reed switch magnetic sensor as a detector for the movement of steel balls in the tube. This sensor produces a signal which is sent to the Arduino, then processes the data and displays the viscosity value on the LCD screen. This research method uses laboratory-based experimental research by conducting laboratory-scale viscosity characterization using five fluid solutions, namely water, used cooking oil, new cooking oil, used oil and new oil. The viscosity sample is put into a tube, and a steel ball is placed in the solution. The stepper motor then moves the steel ball at a specified speed, and a magnetic reed switch sensor detects the movement of the ball. The data obtained from the sensor is sent to Arduino, processed, and the viscosity results are displayed on the LCD screen. The results of measuring the fluid viscosity values of water, used cooking oil, new cooking oil, used oil and new oil respectively produced (Pa.s units) 2.12; 3.18; 2.84; 3.52; and 7.71. The test results show that this viscosity probe is able to provide accurate and consistent results in measuring the viscosity of fluid solutions with an average error of 7.425% compared to conventional viscosity probes. This instrument can also be used to measure the viscosity of various types of liquids with appropriate parameter adjustments. Keywords: fluid viscosity; magnetic mini reed switch sensor.
Adsorption of Malachite Green Dye by Magnetic Carboxymethyl Chitosan Kurniasih, Mardiyah; Setyaningtyas, Tien; Riyani, Kapti; Luthfia, Adilla; Aghniya, Imtiyazul
Jurnal Rekayasa Kimia & Lingkungan Vol 19, No 2 (2024): Jurnal Rekayasa Kimia & Lingkungan (December, 2024)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v19i2.36424

Abstract

Malachite green dye is widely used in the textile industry. Wastewater contaminated with malachite green dye threatens aquatic life and human health. Therefore, adsorption is needed in the dye waste treatment process. This research aims to synthesize magnetic carboxymethyl chitosan as an adsorbent for malachite green dye. Magnetic carboxymethyl chitosan was synthesized via a coprecipitation method and analyzed using FTIR. Batch experiments were used to study the adsorption of malachite green dye under adsorption parameters, such as the effects of pH and time, adsorption kinetics, isotherms, and reusability. The research results show that at pH 4, malachite green adsorbed most effectively into magnetic carboxymethyl chitosan. The pseudo-second-order kinetic model and the Langmuir adsorption isotherm model describe the adsorption process. Reduction for malachite green chitosan, carboxymethyl chitosan, and magnetic carboxymethyl chitosan were 34.19, 83.24, and 91.34%, respectively.
Optimization and Characterization of Urease Immobilization from Red Lentil Seeds (Lens culinaris) Using Chitosan zusfahair, zusfahair; Ningsih, Dian Riana; Bilalodin, Bilalodin; Fatoni, Amin; Luthfia, Adilla; Purwati, Purwati; Muslihah, Niken Istikhari; Apriliadina, Inessa Putri
Molekul Vol 20 No 2 (2025)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2025.20.2.13134

Abstract

ABSTRACT. Urease is an enzyme that plays a vital role in catalyzing the hydrolysis of urea into ammonia (NH3) and carbon dioxide (CO2). This study focuses on the isolation of urease from red lentil seeds, followed by its immobilization. The objective of this research is to optimize and characterize urease that has been immobilized using chitosan and activated with glutaraldehyde. Red lentil seeds were processed with a mortar and pestle at low temperatures (4 °C) to obtain a crude enzyme extract, which was then concentrated using 50% acetone (P50) prior to immobilization. The optimization process for P50 urease immobilization involved assessing various factors, including chitosan concentration, glutaraldehyde concentration, temperature, and the immersion duration in glutaraldehyde. The findings revealed that the optimal conditions for immobilizing P50 urease were achieved at a chitosan concentration of 0.75%, with a 2% glutaraldehyde soak at 25 °C for 2 hours, resulting in an enzyme activity of 7.042 U/g. The immobilized P50 urease demonstrated the ability to be reused up to 7 times while maintaining 51% of its initial activity. Scanning Electron Microscopy (SEM) analysis indicated morphological changes in the beads after the addition of glutaraldehyde and the enzyme, shifting from a rounded to an irregular shape. Additionally, Fourier Transform Infrared Spectroscopy (FTIR) analysis identified C-N and C=N peaks, confirming the successful incorporation of glutaraldehyde. Keywords: immobilization, red lentil seeds, glutaraldehyde, chitosan, urease