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All Journal Jurnal Kumparan Fisika Time in Physics: Journal for Theoretical, Instrumentation, Material-Molecular, and Education Physics PEDAMAS (Pengabdian Kepada Masyarakat) Journal of Applied Science and Advanced Engineering
Efendi, Yahya
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Humanities Computer Science & IT Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Health Professions Law, Crime, Criminology & Criminal Justice Mathematics Mechanical Engineering Physics Social Sciences

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Unveiling the Damped Quantum Harmonic Oscillator Efendi, Yahya; Anumillah, Faza Atika; Nurhuda, Muhammad
Jurnal Kumparan Fisika Vol. 7 No. 3: Desember 2024
Publisher : Unib Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jkf.7.3.114-126

Abstract

Abstract   This article dis cusses the often-overlooked "damped" quantum harmonic oscillator, a vibrating system that loses energy over time. We bridge the classical-quantum divide, starting with the familiar equation of motion for a damped oscillator using Hooke's law. Delving into quantum mechanics, we explore how the Schrödinger equation governs its behavior. We then chart a path to understanding its energy changes and time evolution using mathematical tools like annihilation and creation operators, eigenstates, and eigenvalues. We then step through the understanding of its energy changes and time evolution using mathematical tools like annihilation and creation operators, eigenstates, and eigenvalues. Finally, we introduce the time-dependent Schrödinger equation for a damped quantum harmonic oscillator, which paves the way for stable oscillations   Keywords: Damped Quantum Oscillator; Canonical Quantization; Invariant Operator; Time-Dependent Schrödinger Equation   Abstrak   Artikel ini membahas osilator harmonik kuantum teredam, sebuah sistem getaran yang kehilangan energi seiring waktu, yang sering kali diabaikan dalam kajian fisika. Kami menjembatani kesenjangan antara mekanika klasik dan kuantum, dimulai dengan persamaan gerak osilator teredam berdasarkan hukum Hooke. Dalam ranah mekanika kuantum, kami mengeksplorasi bagaimana persamaan Schrödinger mengatur perilaku sistem ini. Selanjutnya, kami menelusuri perubahan energi dan evolusi waktu osilator ini menggunakan alat matematika seperti operator annihilasi dan kreasi, eigenstate, dan eigenvalue. Terakhir, kami memperkenalkan persamaan Schrödinger bergantung waktu untuk osilator harmonik kuantum teredam, yang membuka wawasan terhadap osilasi stabil dalam sistem ini.   Kata kunci: Osilator Kuantum Teredam; Kuantisasi Kanonik; Operator Invarian; Persamaan Schrödinger Bergantung Waktu
Analysis of Caffeine Levels in Pacitan Speciality Coffee Using UV-Visible spectrophotometry Efendi, Yahya; Myesha A, Renetha Salma; Syahnuron, Fathur
TIME in Physics Vol. 3 No. 1 (2025): March
Publisher : Universitas Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/timeinphys.2025.v3i1p1-7

Abstract

The Indonesian community, particularly the people of Pacitan Regency, has a deep-rooted connection with coffee. Coffee is a beverage that is almost always served to guests as a customary offering. Pacitan Regency is known for its unique local coffee varieties, namely Kopi Tejo, Kopi Klethik, and Kopi Bima. Coffee contains caffeine, a group of methylxanthine compounds that occur naturally and are classified as xanthine derivatives, belonging to the alkaloid compound group. Caffeine in coffee provides various health benefits when consumed in moderate amounts. This study aimed to analyze the caffeine content in Pacitan’s traditional coffee varieties using UV-Visible spectrophotometry. The analysis revealed that Kopi Tejo contains 0.6040 mg of caffeine per gram, Kopi Klethik contains 0.5547 mg of caffeine per gram, and Kopi Bima contains 0.3213 mg of caffeine per gram.
Measurement of Benzo [a]pyrene concentration in motor vehicle emissions using STM32F103-based TGS822 sensor Hawa, Anjani Anil; Wardoyo, Arinto Yudi Ponco; Anggraeni, Dewi; A, Renetha Salma Myesha; Efendi, Yahya
Journal of Applied Science and Advanced Engineering Vol. 3 No. 2 (2025): JASAE: September 2025
Publisher : Master Program in Mechanical Engineering, Gunadarma University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59097/jasae.v3i2.59

Abstract

Benzo[a]pyrene is one of the PAHs (Polycyclic Aromatic Hydrocarbons) pollutants originating from incomplete combustion or pyrolysis of organic materials. Benzo[a]pyrene is classified in GRUB 1 materials that have a carcinogenic impact on humans. Benzo [a]pyrene sources can be found in air, surface water, and soil. Benzo[a]pyrene can be sourced from motor vehicle emissions as a pollutant in the air. The incomplete combustion of fossil fuels used as motor vehicle fuel can be a source of Benzo[a]pyrene in the air. Therefore, research is needed to quantify the Benzo[a]pyrene concentration. This study aims to measure the concentration of Benzo[a]pyrene gas produced from motor vehicle emissions. The vehicle to be measured is two-wheeled vehicles with pertalite fuel. Vehicle smoke flows into the collection chamber through a hose with three different injection time durations. The measurement was conducted using a system based on the calibrated sensor of TG822. The average total concentration of B [a] P in the chamber depends on the injection time. The concentration is 63.572 ppb for 20s, 64.822 ppb for t40s, and 95.284 ppb for 60s.
MEMBANGAUN LITERASI KEUANGAN UMKM PADA TOKO KUE KUKIS DENGAN PELATIHAN DAN PENDAMPINGAN PEMBUKUAN SEDERHANA Efendi, Yahya; Nugraini
PEDAMAS (PENGABDIAN KEPADA MASYARAKAT) Vol. 2 No. 04 (2024): JULI 2024
Publisher : MEDIA INOVASI PENDIDIKAN DAN PUBLIKASI

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Abstract

UMKM memegang peranan penting dalam pertumbuhan perekonomian, Ada beberapa permasalahan yang dihadapi UMKM pada saat ini diantaranya kesulitan dalam pemasaran, keterbatasan inovasi dan teknologi, serta keterbatasan pengetahuan tentang menyusun laporan keuangan. Dalam rangka meningkatkan daya minat terhadap pentingnya pengetahuan tentang laporan keuangan, Kegiatan pengabdian pada masyarakat ini sangat diperlukan pelatihan pada saat ini. Metode pengabdian dilakukan dengan memberikan arahan, Diskusi dan Pendampingan. Hasil dari kegiatan ini pelaku UMKM sudah mengerti cara membuat laporan keuangan secara sederhana.
Co-Authors A, Renetha Salma Myesha Anumillah, Faza Atika Arinto Yudi Ponco Wardoyo Dewi ANGGRAENI Hawa, Anjani Anil Muhammad Nurhuda Myesha A, Renetha Salma Nugraini Syahnuron, Fathur