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All Journal Proceeding of the Electrical Engineering Computer Science and Informatics Jurnal Pengabdian Masyarakat MIPA dan Pendidikan MIPA Jurnal Ilmu Fisika dan Terapannya (JIFTA)
Purwanto, Agus
Jurusan Pendidikan Fisika, Universitas Negeri Yogyakarta, Jl. Colombo No. 1, Yogyakarta
Astronomy Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mathematics Physics

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The Improvement of Phonocardiograph Signal (PCG) Representation Through the Electronic Stethoscope Sumarna Sumarna; Juli Astono; Agus Purwanto; Dyah Kurniawati Agustika
Proceeding of the Electrical Engineering Computer Science and Informatics Vol 4: EECSI 2017
Publisher : IAES Indonesia Section

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (477.746 KB) | DOI: 10.11591/eecsi.v4.1008

Abstract

A conventional stethoscope (an acoustic stethoscope) is an acoustic medical device that is always used for preliminary examination of patients with any heart abnormalities. The main disadvantage of acoustic stethoscope is its dependence on how to use it and the experience of the examining physician. This paper presents a simple electronic stethoscope design in Phonocardiograph system that is free from subjectivity of doctors or other medical personnel. This electronic stethoscope is made sensitive in order to capture as many acoustic signal as possible from the activities of the human body, especially the heart and lungs. The design of this electronic stethoscope consists of chest piece, a pipe with proper acoustic impedance, mic condenser, mic preamp, and battery. The output of the mic preamp is connected to the mic channel on the laptop. The recording signal then processed separately. The repeatability of output signal was investigated in this paper. The signal was analyzed by using the Fast Fourier Transform (FFT). The result showed that the frequency responsea of the output signals are consistent, hence the instrument is reliable. Furthermore, the frequency response of the system with filter that connecting chest piece and mic condensor were also investigated.
Penyuluhan Alat Deteksi Kesadahan Dalam Air Berbasis Light Dependent Resistor Di Kelurahan Giritontro, Kecamatan Giritontro, Kabupaten Wonogiri Sumarna Sumarna; Dyah Kurniawati Agustika; Agus Purwanto; Nur Kadarisman; Anggiyani Ratnaningtyas Eka Nugraheni; Dina Dina
Jurnal Pengabdian Masyarakat MIPA dan Pendidikan MIPA Vol 2, No 2 (2018): Vol 2, No 2 (2018)
Publisher : Yogyakarta State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (401.62 KB) | DOI: 10.21831/jpmmp.v2i2.21916

Abstract

Beberapa daerah di Wonogiri memiliki tanah yang mengandung kapur, sementara itu sebagian masyarakat mengonsumsi air yang berasal dari dalam tanah. Pada kegiatan pengabdian kepada masyarakat tahun 2016 ditemukan permasalahan dalam masyarakat di kelurahan Wonogiri yaitu sulitnya mendeteksi adanya kapur dalam air yang mereka konsumsi. Sebagai akibatnya banyak masyarakat yang menderita penyakit dalam yang diakibatkan pengendapan kapur di dalam tubuh mereka seperti penyakit ginjal. Oleh karenanya, tim PPM Fakultas MIPA Universitas Negeri Yogyakarta membangun sistem pendeteksi adanya kapur dalam cairan berbasis Light Emitting Diode (LED) dan Light Dependent Resistor (LDR). LED digunakan untuk menyinari cairan dengan kadar kapur yang berbeda-beda, kemudian LDR akan mendeteksi cahaya LED yang melewati cairan tersebut. Besar kecilnya nilai luaran LDR akan bergantung kadar kapur dalam cairan. Masyarakat sangat antusias dan mulai menggunakan alat ini untuk mendeteksi adanya kapur di air yang mereka konsumsi. Kata kunci: Kesadahan, LDR, LED Workshop On Detector of Water Hardness Based On Light Dependet Resistor In Giritontro Village, Giritontro District, Wonogiri RegencyAbstract           Some areas in Wonogiri contain hardness in its soil, while some people consume water that come from the soil. In community service activity in 2016, we found problems in the community in Giritontro, Wonogiri that is the difficulties to detect the hardness in the water that people consume. As a result, many people who suffer from internal diseases caused by the deposition of lime in their bodies such as kidney disease. Therefore, the PPM team of the Faculty of Mathematics and Natural Sciences of Yogyakarta State University built a hardness detection system in liquid based Light Emitting Diode (LED) and Light Dependent Resistor (LDR). LEDs are used to irradiate fluids with different lime levels, then LDR will detect the LED light passing through the liquid. The size of the LDR output value will depend on the lime content in the liquid. People are very enthusiastic and start using this tool to detect the presence of limestone in the water they consume. Keywords: Hardness, LDR, LED
PENGUKURAN MODULUS ELASTISITAS KAYU MENGGUNAKAN GELOMBANG AUDIOSONIK MEASURING THE WOOD’S MODULUS ELASTICITY USING AUDIO SONIC WAVE Viky Nurlaili; Agus Purwanto
Jurnal Ilmu Fisika dan Terapannya (JIFTA) Vol 10, No 1 (2023): Jurnal Fisika
Publisher : Prodi Fisika, Departemen Pendidikan Fisika

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Abstract

AbstrakPenelitian ini bertujuan untuk mengetahui cara menentukan modulus elastisitas kayu dengan menggunakangelombang audiosonik dan mengetahui nilai modulus elastisitas kayu sengon, kayu mahoni, dan kayu keruing.Cepat rambat gelombang dalam kayu diperoleh dengan metode standing wave. Pada standing wave terbentuksimpul dan perut. Cepat rambat gelombang dapat diperoleh dari pengukuran panjang gelombang dengan frekuensitertentu. Nilai modulus elastisitas dinamis kayu diperoleh dari data cepat rambat gelombang audiosonik dalam kayudan kerapatan kayu. Hasil analisis cepat rambat bunyi gelombang audiosonik pada kayu sengon sebesar (152± 2) ×101 m/s, kemudian kayu mahoni sebesar (178 ± 2) × 101 m/s, dan yang paling besar adalah kayu keruing sebesar(189 ± 2) × 101 m/s. Kerapatan kayu sengon adalah (0,38 ± 0,01) × 103 kg/m3, kayu mahoni (0,55 ± 0,02) × 103kg/m3, dan kayu keruing (0,76 ± 0,02) × 103 kg/m3. Dari hasil cepat rambat gelombang audiosonik dalam kayu dankerapatan kayu tersebut diperoleh modulus elastisitas dinamis kayu sengon sebesar (88 ± 2) × 107 kg/ms2, kayumahoni (173 ± 4) × 107 kg/ms2, dan kayu keruing (272 ± 5) × 107 kg/ms2.Kata kunci: Kayu, Modulus Elastisitas, dan Cepat Rambat GelombangAbstractThis research aimed to find out the way to determine wood’s modulus elasticity using audio sonic waveand to find out modulus elasticity of sengon “Albazia falcataria (L.) Fosberg”, mahoni “Swietenia mahagoni (L.)Jacq”, and keruing “Dipterocarpus spp.”. The method to find out the wave propagation speed in wood wasstanding wave. In standing waves there were nodes and antinodes. The wavelength on certain wave frequencydetermined the speed of wave propagation. Wood density was measured by dividing wood mass with respect towood volume. Dynamic modulus elasticity of woods can be measured from the audio sonic wave propagation speedon the woods and woods density. The result of audio sonic wavespeed were (152± 2) × 101 m/s for sengon “Albaziafalcataria (L.) Fosberg”, (178 ± 2) × 101 m/s for mahoni “Swietenia mahagoni (L.) Jacq”, and (189 ± 2) × 101 m/sfor keruing “Dipterocarpus spp.”. Wood density of sengon “Albazia falcataria (L.) Fosberg” was (0,38 ± 0,01) ×103 kg/m3, mahoni “Swietenia mahagoni (L.) Jacq” was (0,55 ± 0,02) × 103 kg/m3, and keruing “Dipterocarpusspp.” was (0,76 ± 0,02) × 103 kg/m3. From those data the result of dynamic woods elasticity modulus were (88 ± 2)× 107 kg/ms2 for sengon “Albazia falcataria (L.) Fosberg”, (173 ± 4) × 107 kg/ms2 for mahoni “Swieteniamahagoni (L.) Jacq”, and (272 ± 5) × 107 kg/ms2 for keruing “Dipterocarpus spp.”.Keywords: Woods, Modulus of elasticity, and Speed wave propagation
Co-Authors Agustika, Dyah Kurniawati Anggiyani Ratnaningtyas Eka Nugraheni Astono, Juli Dina Dina Dyah Kurniawati Agustika Dyah Kurniawati Agustika Juli Astono Nur Kadarisman Rhyko Irawan Wisnuwijaya Sumarna Sumarna Viky Nurlaili Wipsar Sunu Brams Dwandaru