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Iful Amri
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Pengembangan Spektroskopi Inframerah Dekat Sederhana untuk Sistem Pengukuran Konsentrasi Sedimen Layang Yuliantini, Lia; Amri, Iful; Djamal, Mitra
Risalah Fisika Vol 1, No 1 (2017): Risalah Fisika ISSN 2548-9011
Publisher : Physical Society of Indonesia (PSI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35895/rf.v1i1.24

Abstract

Telah dibuat sistem pengukuran secara real-time konsentrasi sedimen layang menggunakan spektroskopi sederhana berbasis inframerah dekat.Metode pengukuran sedimen layang yang telah berkembang saat ini adalah metode gravimetrik, instrumen optik, dan sistem akustik. Akan tetapi metode gravimetrik tidak dapat digunakan untuk pengukuran secara real-time sedangkan instrumen optik dan sistem akustik memerlukan biaya yang cukup mahal dan rumit dalam pengoperasiannya. Sistem pengukuran pada penelitian ini relatif murah dan sederhana yaitu terdiri dari inframerah dekat sebagai pemancar (transmitter), fotodioda sebagai penerima (receiver), dan mikrokontroler sebagai antarmuka sensor dengan PC. Setelah itu instrumen yang telah dibuat dikalibrasi menggunakan larutan tanah. Tanah yang digunakan terlebih dahulu dikeringkan lalu  disaring menggunakan ayakan dengan lubang ayakan berdiameter kurang dari 2 mm. Tanah yang sudah disaring ditumbuk sampai halus dan ditimbang. Masa tanah divariasikan (15, 18, 21, 24, 27, 30 dan 33 g) dan ditambahkan air sebanyak 500 ml sehingga diperoleh konsentrasi sedimen layang dari 0,030 sampai 0,060 g/ml. Hasil yang diperoleh menunjukkan bahwa hubungan konsentrasi sedimen layang dengan tegangan keluaran fotodioda adalah eksponensial dengan nilai R-square 0,98778. Fungsi transfer yang diperoleh berupa logaritmik dengan R-square 0,99105.  Berdasarkan data penelitian dapat disimpulkan bahwa nilai transmisi semakin menurun sedangkan nilai absorpsi larutan semakin meningkat seiring bertambahnya konsentrasi sedimen layang. Kesalahan untuk instrumen ini yaitu di bawah 8,2%..
RANCANG BANGUN SISTEM PENANGKAP DAN PEMBACAAN GELOMBANG SEISMIK REFRAKSI UNTUK EKSPLORASI HIDROKARBON Maison Maison; Faizar Farid; Samsidar; Linda Handayani; Rustan; Jesi Pebrilia; Iful Amri
JOURNAL ONLINE OF PHYSICS Vol. 5 No. 1 (2019): JOP (Journal Online of Physics) Vol 5 No 1
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v5i1.8115

Abstract

The subsurface data acquisition in seismic eksploration usually using expensive equipment. In this work, a low-cost seismic equipment system has been developed for receive and record seismic wave. This system consist of mikrocontroller and software LabView that connected to PC. The subsurface low signals is recorded by geophone and through the amplifier instrument non-inverting. Then, the digital signals is prosessed by Mikrocontroller and visualize by LabView. Output of seismic measurement using this system design are travel time and amplitude. Travel time is used to modelling density and wave velocity to generate wave model. The expected model can give us value of density and wave velocity to obtain the anomaly. It has been tested using 1 geophone and successfully showed the wave, amplitude, and travel time.
APLIKASI SENSOR KELEMBABAN DAN FLEX SENSOR BERBASIS ARDUINO UNO UNTUK SISTEM PENDETEKSI LONGSOR Rustan Rustan; Jesi Pebralia; Tika Restianingsih; Frastica Deswardani; Mardian Peslinof; Nurhidayah Nurhidayah; Iful Amri
JOURNAL ONLINE OF PHYSICS Vol. 7 No. 1 (2021): JOP (Journal Online of Physics) Vol 7 No 1
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v7i1.14805

Abstract

Early detection of landslides is very important to minimize the number of deaths. Technological developments allow humans to predict the signs of landslides more accurately, quickly, and scientifically. In this study, sensors were tested to measure landslide disaster parameters, namely humidity sensors to measure soil moisture and flex sensors to measure soil movement. The sensor is controlled using a microcontroller Arduino Uno. A functionality test was carried out to test the ability of the sensors. The functionality test was carried out using the unit testing method. The unit testing method is carried out by comparing the functional test results of each sensor to the expected response. The moisture sensor functionality test shows that the sensor is able to respond to changes in water content in the soil with changes in voltage. The linear equation resulting from the calibration of the humidity sensor is y = -0.126x + 2.666 with R2 = 0.871. The flex sensor functionality test shows that the sensor is able to detect soil movement in the presence of changes in voltage. The linear equation resulting from the flex sensor calibration is y = -2.861x + 2507 with R2 = 0.964. This shows that the humidity sensor and flex sensor are good enough to be applied in the design of a landslide detection system.
STUDY AWAL KARAKTERISASI SENSOR WARNA TC3200 UNTUK MENENTUKAN KADAR KAFEIN PADA KOPI Heriyanti Heriyanti; Samsidar Samsidar; Iful Amri; Jesi Pebralia; Rustan Rustan; Linda Handayani; Mardian Peslinof; Desi Ayundari; Sutrisno Sutrisno
JOURNAL ONLINE OF PHYSICS Vol. 7 No. 1 (2021): JOP (Journal Online of Physics) Vol 7 No 1
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v7i1.15286

Abstract

Pengukuran kadar kafein saat ini dibutuhkan agar penggunaan/konsumsi kopi sesui dengan dosis yang dibutuhkan, akan tetapi, sulitnya karakterisasi dan uji kimia dalam penentuan kadar kafein menjadi hambatan untuk mengetahui dosis kafein secara cepat dan tepat. Pada penelitian ini telah dilakukan karakterisasi sensor warna TC3200 sebagai studi awal rangkaian pembuatan alat ukur kafein berbasis sensor. Sampel yang digunakan adalah kopi Liberika, Arabika dan Robusta yang berasal dari Provinsi Jambi. Preparasi sampel dilakukan dengan proses roasting pada suhu 180OC dan pada saat proses berjalan pengambilan sampel secara real time pada (t= 38-45s), hasil preparasi sampel dilakukan uji UV-Vis untuk mengetahui konsentrasi  kandungan kadar kafein. Selanjutnya karakterisasi sensor warna TC3200 dilakukan untuk mengetahui nilai RGB (Red, Green, Blue) dari masing – masing sampel kopi. Hasil penelitian didapatkan nilai kadar kafein dari pengukuran UV-Vis yang akan menjadi database sensor, dan hasil karakterisasi sensor warna TC3200 pada kopi Liberika, Arabika dan Robusta secara kuantitatif didapatkan tingkat kevalidan data masing – masing 80%, 60% dan 70% dan analisis kualitatif bahwa sensor dapat digunakan untuk menetukan kadar kafein pada kopi dengan tingkat kematangan atau waktu roasting kopi yang berbeda.
PENGEMBANGAN MEDIA PEMBELAJARAN E-LEARNING BERBASIS WEB UNTUK MATA KULIAH PENDAHULUAN FISIKA INTI iful amri; Syuhendri Syuhendri; Ketang Wiyono
JURNAL INOVASI DAN PEMBELAJARAN FISIKA Vol 2, No 1 (2015): JURNAL INOVASI DAN PEMBELAJARAN FISIKA
Publisher : Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jipf.v2i1.2351

Abstract

It has done other research development to produce instructional media web-based e-Learning courses Introduction to Physics Core. Development of research models used is the 4D model, which includes the step of defining, designing, development, and deployment. At defining stage consists of front-end analysis, analysis of student, tasks and concepts, as well as learning objectives. At the design stage consisted of drafting to design activities carried out in the form of e-Learning web. Then, the stage of development consists of e-Learning web validation, and test limited to the students to see the practicality. While the deployment phase is not implemented. The instruments used are (1) sheet validation experts (2) student questionnaire responses, and (3) observation sheet. Based on the assessment of experts, the average total validity (RTV) e-Learning web-developed is the web RTV ≤ 4 ≤ 5, namely sebesar4,55. RTV values ​​are included in the category of very valid. Based on the questionnaire responses of students who tested on 31 students, web e-Learning practical expressed with a percentage of 75.44% and the percentage of enforceability limited trial based on observation of student activity 84.03%. It was concluded that the e-Learning web courses Introductory Physics Core has been developed to meet the criteria of validity and practicality as well as meet the rules of development in accordance with the purpose of learning and applicable curriculum
DINAMIKA GANGGUAN SKALAR ORDE KE-NOL PADA MODEL INFLASI STAROBINSKY MENGGUNAKAN FORMALISME ARNOWITT-DESER-MISNER (ADM) Jesi Pebralia; Iful Amri
Jurnal Ilmu Fisika dan Pembelajarannya (JIFP) Vol 2 No 1 (2018): Jurnal Ilmu Fisika dan Pembelajarannya (JIFP)
Publisher : Program Studi Pendidikan Fisika, UIN Raden Fatah Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (291.04 KB) | DOI: 10.19109/jifp.v2i1.2801

Abstract

Penelitian ini membahas dinamika gangguan skalar pada model inflasi Starobinsky dengan menggunakan formalisme Arnowitt-Deser-Misner (ADM) pada masa inflasi kosmik. Tujuan dari penelitian ini ialah untuk mendapatkan bentuk persamaan gerak medan skalar orde ke-nol pada model inflasi Starobinsky dan membandingkannya dengan bentuk persamaan gerak medan skalar pada model inflasi medan skalar secara umum. Analisis awan penelitian dilakukan dengan cara menerapkan metrik ADM pada aksi skalar-tensor dan menerapkan teori gangguan pada metrik tersebut sehingga didapat aksi skalar-tensor orde kedua. Analisis penelitian kemudian dilanjutkan dengan menerapkan metrik ADM pada aksi kurvatur-skalar dan menerapkan teori gangguan pada metrik tersebut sehingga didapat aksi skalar-tensor orde kedua. Hasil dari penelitian ini menunjukkan bahwa pada masa inflasi kosmik nilai konstanta Hubble H konstan.
A A SIMPLE OF IOT BASED SOCIAL CONTACT TRACKING FOR INFECTIOUS PATIENT USING ULTRASONIC SENSOR: A PRELIMINARY STUDY Iful Amri; Jesi Pebralia
JOURNAL ONLINE OF PHYSICS Vol. 7 No. 2 (2022): JOP (Journal Online of Physics) Vol 7 No 2
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v7i2.18192

Abstract

One of the efforts to inhibit the transmission of infectious diseases caused by viruses and bacteria is through applying physical distancing. This study aims to create a contact monitoring tool for patients who have been infected with contagious diseases based on ultrasonic sensors and the internet of things (IoT). This instrumentation system consists of four ultrasonic sensors mounted on the left, right, front and rear sides. The sensor will detect the distance of the object that is approaching directly. Then, the measurement data of each sensor will be sent to the cloud and accessed through the Blynk application. The results show that the performance of each ultrasonic sensor is excellent and can be applied as a distance measuring device between patients and other people. The calibration results show that the ultrasonic sensor can measure a distance of 10-200 cm with an R squared value of 0.999-1. In addition, the ESP8266 also shows excellent performance. ESP8266 can send data to the cloud to be accessed and displayed in the form of a bar graph on a mobile phone. Thus, the overall system can be stated that the instrumentation system has functioned and is working well.
SISTEM MONITORING KEBAKARAN HUTAN BERBASIS INTERNET OF THINGS (IoT) Jesi Pebralia; Rustan Rustan; Rizqa Raaiqa Bintana; Iful Amri
Komunikasi Fisika Indonesia Vol 19, No 3 (2022)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.19.3.183-189

Abstract

In this study, a forest fire monitoring system based on IoT has been developed where the parameters used include temperature, wind speed, air humidity, and hotspots. These physical parameters are measured in real time using sensors installed in locations prone to forest fires. The sensor measurement data sent and processed by the Arduino Uno microcontroller and sent to the server using the Internet of Things (IoT). The forest fire monitoring system developed has a high level of accuracy, where the temperature sensor has an accuracy of 99.9%, the air humidity sensor has an accuracy of 97.85%, and the wind speed sensor has an accuracy of 90.70%. The hotspot detection system also has good performance, where the sensor can detect the presence of hotspot in real time. The development of an IoT system for monitoring four forest fire parameters was made using the Blynk application. The system can work well where data from the four forest fire parameters can be monitored in real time via computer devices or via smartphones.
PENGEMBANGAN ALAT UKUR KEMATANGAN KOMPOS BERBASIS ARDUINO ATMEGA328 Linda Handayani; Jesi Pebralia; Iful Amri; Ardiyaningsih Puji Lestari
JOURNAL ONLINE OF PHYSICS Vol. 8 No. 2 (2023): JOP (Journal Online of Physics) Vol 8 No 2
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v8i2.24331

Abstract

Kematangan kompos mengacu pada tingkat dekomposisi atau penguraian bahan organik dalam kompos. Kematangan kompos dapat dilihat dari parameter kelembaban, pH, dan suhu kompos. Pada penelitian ini dikembangkan alat ukur kematangan kompos berbasis arduino ATMega328 yang dilengkapi dengan sensor yang memungkinkan pengukuran parameter-parameter kritis seperti pH, suhu, dan kelembaban, yang sangat penting untuk menentukan tingkat kematangan kompos. Tahapan penelitian meliputi perencanaan desain perangkat keras, perancangan sistem perangkat lunak, perakitan alat, kalibrasi, dan analisis data. Pengujian dilakukan terhadap alat yaitu uji tingkat presisi. Uji presisi dilakukan dengan cara melakukan percobaan pengukuran parameter kompos secara berulang. Pada tahap kalibrasi, diperoleh persentase tingkat akurasi pengukuran suhu sebesar 97,42%, tingkat akurasi pengukuran pH sebesar 97,7%, dan tingkat akurasi pengukuran kelembaban sebesar 99,5%. Hasil pengujian akurasi alat dari masing-masing tiga parameter yaitu nilai suhu, pH, dan kelembaban, menunjukkan bahwa akurasi rata-rata alat berada pada angka 96,87%. Berdasarkan pengujian alat yang dilakukan terhadap sampel kompos dengan lima kali perulangan diperoleh standar deviasi pengukuran dari unsur C yaitu sebesar 1,56 dan nilai koefisien variasi yaitu sebesar 4,3%, deviasi pengukuran dari unsur N sebesar 0,07 dengan koefisien variasi yaitu sebesar 1,92%, standar deviasi dari unsur K yaitu 0,04 dan nilai koefisien variasi yaitu sebesar 0,81%. Rata-rata hasil pengujian nilai presisi enam parameter pada alat yang dikembangkan yaitu sebesar 91,24%. Berdasarkan nilai tersebut, maka alat yang dikembangkan mempunyai tingkat presisi yang sangat tinggi.
IMPLEMENTATION OF INTERNET OF THINGS (IoT) BASED ON GOOGLE SHEETS FOR WATER QUALITY MONITORING SYSTEM Jesi Pebralia; Linda Handayani; Dawam Suprayogi; Iful Amri
JOURNAL ONLINE OF PHYSICS Vol. 9 No. 1 (2023): JOP (Journal Online of Physics) Vol 9 No 1
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v9i1.28689

Abstract

Temperature, pH, and TDS are important indicators of water quality that affect various aspects. This research aims to develop a water quality monitoring system by implementing Internet of Things (IoT) technology based on Google Sheets. Based on the tests for each sensor - temperature, pH, and TDS - the results show that the system has an excellent level of measurement precision, with an average precision value of above 95%. The findings also indicate that Google Sheets can be utilized in IoT technology and can operate on more than one distinct computer device at the same time. The use of Google Sheets in IoT technology is highly effective, flexible, and user-friendly. The measured data can be automatically stored and can be visualized effectively.".
Co-Authors Anak Agung Istri Sri Wiadnyani Ardiyaningsih Puji Lestari Dawam Suprayogi Desi Ayundari Faizar Farid Frastica Deswardani Heriyanti Heriyanti Jesi Pebralia Jesi Pebralia Jesi Pebralia Ketang Wiyono Linda Handayani Maison - Mardian Peslinof Mitra Djamal Nurhidayah Nurhidayah Rizqa Raaiqa Bintana Rustan Samsidar Samsidar Samsidar Sutrisno Syuhendri, Syuhendri Tika Restianingsih Yuliantini, Lia