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All Journal Indonesian Journal of Electronics and Instrumentation Systems Jurnal Sains Dasar Magister Scientiae PROSIDING : Seminar Nasional Fisika dan Pendidikan Fisika Majalah Kedokteran Gigi Indonesia Biomedika Journal of Physics: Theories and Applications INDONESIAN JOURNAL OF APPLIED PHYSICS Prosiding SNPF (Seminar Nasional Pendidikan Fisika) WAKTU: Jurnal Teknik UNIPA Jurnal Fisika Indonesia Journal of Multidisciplinary Applied Natural Science Indonesian Journal of Teaching in Science JKKI : Jurnal Kedokteran dan Kesehatan Indonesia Makara Journal of Science
Mitrayana -
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Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Dentistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Public Health Social Sciences Other

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CO2 LASER POWER OPTIMIZATION OF PHOTOACOUSTIC SPECTROMETER AND IT’S APPLICATION TO DETECT AMMONIA GAS (NH 3 ) CONCENTRATION ON ISOTONIC BEVERAGE CONSUMER’S BREATH Bergitta Dwi Annawati; Mitrayana Mitrayana
Magister Scientiae No 47 (2020)
Publisher : Widya Mandala Surabaya Catholic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (479.215 KB) | DOI: 10.33508/mgs.v1i47.2442

Abstract

Performance of photoacoustic spectrometer CO2 laser can be optimized by variation of laser voltage with active laser medium gas compositions include gases He, N2 and CO2. Characterization of photoacoustic spectrometer CO2 laser is done by determined resonance curve, quality factor, noise and lowest detection limit. Photoacoustic spectrometer applied to detect ammonia gas concentration in isotonic beverage. Photoacoustic spectrometer was applied to detect the concentration of ammonia in the isotonic drinks and measuring result using multicomponent-analysis. The lowest detection limit for ammonia gas on line 10R14 obtained at (70 ± 7) ppb with highest laser power obtained at (37 ± 0.1) W and the composition of the active medium gas He, N2 and CO2 30:40:30. The highest concentration of ammonia gas, 0 minute in range of (2.89 ± 0.05) ppm, 30 minutes in range of (4.22 ± 0.05), 60 minutes in range of (5.34 ± 0.05), 120 minutes in range of (5.49 ± 0.05) ppm, 150 minutes in range of (3.62 ± 0.05) ppm and 180 minutes in range of (3.28 ± 0.05) ppm. Changes concentration of ammonia gas result are influenced by the length of time after consuming isotonic beverage.
Pengukuran Kadar Aseton Udara Nafas sebagai lndikator Peningkatan Ketogenesis pada Penderita Diabetes Melitus Tidak Terkontrol Moh. Robikhul Ikhsan; Luthfan Budi Purnomo; Mitrayana Mitrayana
JKKI : Jurnal Kedokteran dan Kesehatan Indonesia JKKI, Vol 2, No 6, (2010)
Publisher : Faculty of Medicine, Universitas Islam Indonesia

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Abstract

Impaired of carbohydrate metabolism is characteristic of Diabetes Mellitus (OM) subjects that cause dysregulation of glucose uptake by target cell. Ketogenesis is compensation of this condition. The basic of this process is fatty acid oxydation. Increasing of fatty acid oxydation formed ketone bodies that we called acetone and can detected by air breathing. Aim of study to determine corelation between acetone level in air breath test as indicator of fatty acid oxydation and fasting blood glucose level in uncontrolled OM subjects.Cross-sectional, uncontrolled OM subjects and healthy person as control group. We measured fasting blood glucose (FBG) level and samples of air breath and analyse with spectroscopy fotoacustic laser. Corelation betwen level of acetone and FBG analyse with Pearson corelation. Compare means of acetone level between OM subject and control group analyse with non parametric mann-whitney U test. P value 0,05, Cl 95%. Ten uncontrolled OM subjects and 10 healthy persons as control group was followed this study. Mean of age and body mass index are 48,7 2: 5,6 vs. 49,2 2: 4,4 years (p>0,05 IK 95%) and BMI 22,4 2: 2,1 vs. 22,9 2: 3,8 kg!m2 (p>0,05 IK 95%). Level of acetone between OM subjects and control group 260.:!: 41,1 vs 177.:!: 18,4 ppm (p<0,05). There is strong corelation between acetone level and FBG level (r=0,97 p<0,05) Strong corelation between acetone level in air breath with FBG level. We can assumed that level of acetone in air breath can use as indicator of increasing ketogenesis in uncontrooled OM subjects.
Application of a Photoacoustic Tomography System: A Case Study on the Monitoring of Pig Tissue Decomposition Oey, Lusiana Sandra; Mitrayana, Mitrayana; Wasono, Moh. Ali Joko
Makara Journal of Science Vol. 26, No. 1
Publisher : UI Scholars Hub

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Abstract

Pig carcasses have been used in forensic research because they share several similarities to human cadaver, including decomposition. In several studies, the decomposition of pig’s cadaver for a certain time can be used as a model to determine the time of death of a human. This study was conducted to determine the relationship between the days of spoilage of pig tissue and the level of average sound intensity produced by the sample. Then, in this study, pig skeletal muscles were allowed to decay with a variation of 1–5 days. Afterward, these muscles were imaged using diode laser-based photoacoustic tomography. Results of the experiment show that the average acoustic intensity level from the first day until the fourth day has increased (78–92 a.u for young pig and 76–86 a.u for old pig) but decreased on the fifth day (88 a.u for young and 84 a.u for old pig). These results can improve forensic imaging because such results can be applied to determine the time of death of human by plotting the ratio of the average sound intensity level of the sample to the number of days of decomposition.
Application of Photoacoustic Imaging for Pneumonia Detection Maqfiroh, Caesarany; Widyaningrum, Rini; Anas, Ahmad Mujtahid; Mitrayana, Mitrayana
Makara Journal of Science Vol. 27, No. 2
Publisher : UI Scholars Hub

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Abstract

We used photoacoustic imaging (PAI) to visualize and compare acoustic intensity levels in pneumonia-affected and healthy chicken lungs. After histological confirmation of pneumonia, the samples were scanned and subjected to a 532-nm diode laser in a photoacoustic imaging system. The acoustic intensity level of pneumonia-affected tissue was examined and compared with that of healthy lung samples. The optimum laser frequency and duty cycle for imaging the samples were 17 kHz and 30%, respectively. The acoustic intensity levels of pneumonia-affected tissue and healthy lungs were −82.5 ± 1.8 dB and −79.9 ± 1.3 dB, respectively. We found that a simple PAI device consisting of a diode laser and condenser microphone could distinguish between pneumonia-affected and healthy lungs. Pneumonia-affected lungs produced less acoustic intensity than that healthy lungs, as supported by histological studies.
Computational Thinking in Mathematics Learning: Systematic Literature Review Mitrayana, M.; Nurlaelah, Elah
Indonesian Journal of Teaching in Science Vol 3, No 2 (2023): IJOTIS: September 2023
Publisher : Universitas Pendidikan Indonesia (UPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijotis.v3i2.60179

Abstract

Computational Thinking (CT) has contributed to changing curricula around the world and is needed by everyone. This study aims to determine the research focus related to Computational thinking in mathematics learning and its novelty. The method used in this study is the method with systematic literature review (SLR). The data taken comes from the Google Scholar and Scopus databases. The moderator variables involved in this study were the year of publication, level of education, research class, research methods, and research instruments. All of the data obtained is presented in a quantitative descriptive manner. The results of the research show that 2022 is the highest peak for publication. This research was dominantly conducted at the junior high school level. And the class that is widely used in research is class XI. The study is dominated by descriptive research methods with a qualitative approach. Instruments that are widely used are tests and interviews.
Application of Photoacoustic Spectroscopy for Glucose Level Measurement: A Literature Review Pratama, Buky Wahyu; Widyaningrum, Rini; Setiawan, Andreas; Mitrayana, Mitrayana
Journal of Multidisciplinary Applied Natural Science Vol. 5 No. 2 (2025): Journal of Multidisciplinary Applied Natural Science
Publisher : Pandawa Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47352/jmans.2774-3047.260

Abstract

This study addresses the critical need for effective glucose level measurement in managing diabetes mellitus (DM). DM is a serious, economically influential disease that has no cure at present, highlighting the magnitude of prevention, control, and monitoring of blood glucose levels. This study systematically examined 79 articles from Google Scholar and PubMed databases, focusing on non-invasive glucose measurement using the photoacoustic system. After eliminating duplicates, 27 articles were reviewed. Glucose solution was predominantly used as the primary sample. Fixed and tunable lasers, especially near-infrared (NIR) lasers, were highlighted due to their superior penetration and accuracy in glucose measurements. Signal-purification techniques were used to guarantee accurate detection by removing noise. The evaluation involved regression analysis and machine learning integration to determine glucose levels statistically. The choice of sampling sites in volunteers was a critical factor affecting measurement accuracy. The study demonstrated meaningful progress in the development of photoacoustic methods, particularly in monitoring DM.
Co-Authors Agung Bambang Setio Utomo Agung Bambang Setio Utomo Ananta Kusuma Yoga Pratama Anas, Ahmad Mujtahid Andreas Setiawan Apriyanto, Donni Kis Arif Faisal Bergitta Dwi Annawati Dara Cynthia Nur Cahyani Dewi - Agustina Donni Kis Apriyanto Elah Nurlaelah Fajar Wahid Alim Frans J. M. Harren Gong Matua Julien Mandon Kusminarto - Luthfan Budi Purnomo M. A. J. Wasono M. R. Ikhsan Mahardika Yoga Darmawan Mahendra Kusuma Nugraha Maqfiroh, Caesarany Mirza Satriawan Mochamad Nurul Amin Moh Ali Joko Wasono Moh. Robikhul Ikhsan Munakhir Mudjosemedi Oey, Lusiana Sandra Pratama, Ananta Kusuma Yoga Pratama, Buky Wahyu R. Yosi Aprian Sari Restu Widiatmono Santi Nurmalia Nuzul Supardi Supardi Triyogatama Wahyu Widodo V.J. Cytasari Widhi Afiatun Nafi’ah Widyaningrum, Rini