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All Journal Buletin Udayana Mengabdi Prosiding Seminar Nasional MIPA Jurnal Sains Materi Indonesia Jurnal Neutrino : jurnal fisika dan aplikasinya BULETIN FISIKA PROFESIENSI Indonesian Physical Review Kappa Journal
Nyoman Wendri
Prodi Studi Fisika, FMIPA, Universitas Udayana
Astronomy Earth & Planetary Sciences Education Electrical & Electronics Engineering Environmental Science Materials Science & Nanotechnology Physics Other

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Perancangan Alat Kontrol Ketinggian Air Menggunakan Sensor Ultrasonik Berbasis SMS I Putu Eddy Aditya Harrischandra; I Made Satriya Wibawa; Nyoman Wendri
BULETIN FISIKA Vol 23 No 2 (2022): BULETIN FISIKA August Edition
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2022.v23.i02.p07

Abstract

The controlled water level using an ultrasonic sensor and Short Message Service (SMS) based has been successfully developed. The developed tools using an Arduino UNO ATmega328 as microcontroller, an ultrasonic sensor for measuring the water level, SMS module SIM 800L to receiver and message sender from developed tools to handphone, LCD 16 x 2 as a display, and Relay module as automatic switch that would activate and deactivate the water pump. Before testing the developed tools, the ultrasonic sensor need to be calibrated. Calibration is carried out for adjusting the sensor’s output with the measuring instrument which is a ruler with 1 mm precision. The result of the developed tools has precision value 99.99% and then showing the developed tools worked well.
ALAT PENCATAT TEMPERATUR OTOMATIS MENGGUNAKAN TERMOKOPEL BERBASIS MIKROKONTROLER AT89S51 Nyoman Wendri; I Wayan Supardi; K N Suarbawa; Ni Made Yuliantini
BULETIN FISIKA Vol 13 No 1 (2012): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

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Abstract

An automatic temperature reader has been made by using a thermocouple based on microcontroller AT89S51. The automatic temperature works in range 0°C-66°C which has 6,07% linierity. The sensors of thermocouple works by detect changes of heat, producing in difference of voltage which then will be read by microcontroller AT89S51. The detection data given, will then be send into a PC for it to be further analyzed and finally-shown. The program used for this is Visual Basic 6. The relationship of voltage and temperature is interpolasi polynomial.
PENGENALAN METODE INQUIRI DALAM PEMBELAJARAN IPA DI SDN 6 UBUNG DENPASAR Nyoman Wendri; Made Susilawati
Prosiding Seminar Nasional MIPA 2013: PROSIDING SEMINAR NASIONAL MIPA UNDIKSHA 2013
Publisher : Prosiding Seminar Nasional MIPA

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Abstract

Abstract   Technological developments will not be separated from the development in the field of Natural Sciences (IPA). Development of the field of science is not likely to occur if not accompanied by an increase in the quality of science education, has been teaching science while considered a difficult subject. Inquiri is a learning process based on the search and discovery through systematic thinking process. This activity is done in SDN 6 Ubung Denpasar on fourth grade students. This activity aims to increase the understanding of materials science in the fourth grade students of SDN 6 Ubung Denpasar and increase student interaction in the classroom in the following learning science. IPA materials covered are the parts of the plant. Analysis results obtained mean = 71.79 which indicates that the average student evaluation results for the discussion of the parts of the plants is 71.79, this value is greater than the average value of the specified class, which is 65. T-test results also showed t = 4.40 with p = 0.000 smaller 0.05. This means learning implemented effectively enhance students' understanding and knowledge of the science subjects
Analisis Jaringan Kanker Serviks Menggunakan Spektroskopi Raman Rio Saputra; Ida Bagus Made Suryatika; Nyoman Wendri
BULETIN FISIKA Vol 24 No 2 (2023): BULETIN FISIKA August Edition
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2023.V24.i02.p06

Abstract

Cervical cancer tissue analysis has been carried out using Raman Spectroscopy. The purpose of this study was to determine the effect of differences in power level and exposure time on the Raman spectrum pattern and to determine the power level and exposure time that can be used as a standard to distinguish normal and cancer cervical tissue spectrum patterns. This study used histological preparations of cancerous and normal cervical tissue. The preparations were made in the Anatomical Pathology Laboratory of Sanglah Hospital and the Bali Branch of the Indonesian Cancer Foundation. Samples were treated with power levels of 300 and 400 mW, with exposure times of 3000 and 4000 ms at a wavelength of 1064 nm. The resulting spectrum is then analyzed to be used as a standard in differentiating the spectrum pattern of normal and cancerous cervical tissue. Raman spectroscopy analysis with power levels of 300 and 400 mW on cervical tissue resulted in differences in intensity and shift in wave number. The maximum intensity difference is 0.211 au and the wavenumber shift is 7.257 cm-1. Analysis of cervical tissue using Raman Spectroscopy with exposure times of 3000 and 4000 ms resulted in a difference in intensity of 0.022 au and a wave number of 1432.834 cm-1. The scanning parameters that can be used as standards are 300 mW and 3000 ms with a maximum intensity of 760.392 and 1220.221 au at wave numbers of 1425.577 and 1432.834 cm-1, respectively.
THE EFFICACY OF CHITOSAN FROM WINDU SHRIMP SHELLS AS A PRESERVATIVE OF FRESH KENYAR FISH IN THE FORM OF DARNE DURING STORAGE AT ROOM TEMPERATURE Ni Nyoman Rupiasih; Yosefa Yakunda Tandu; Nyoman Wendri; S. S. Jagtap
Jurnal Neutrino:Jurnal Fisika dan Aplikasinya Vol 15, No 1 (2022): October
Publisher : Department of Physics, Maulana Malik Ibrahim State Islamic University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18860/neu.v15i1.17094

Abstract

This study is about the efficacy of chitosan from windu shrimp shells (Panaeus monodon) as a preservative for fresh fish in the form of darne (steak), namely fresh kenyar fish (Sarda orientalis) during storage at room temperature. The chitosan solution used are chitosan solution with concentration of 1%, 1.5%, 2%, and 2.5%. The fish samples which soaked in that solutions are named T1, T2, T3, and T4, respectively .. The soaking time were 20, 40 and 60 minutes. As control were fish without treatment (C-0) and fish soaked in acetic acid (C-A). All samples stored at room temperature. The activity of chitosan as fish preservative was analyzed through pH and antimicrobial test. The pH test were made in the range of 0, 24, 48 and 72 h. The antimicrobial test was done on the storage period 24 h. The results showed that the greater the concentration of chitosan solution, the shorter the soaking time required to obtain the benefits of chitosan as an antimicrobial agent for fish preservation, especially kenyar fish in the form of darne. The fish that are still suitable for consumption for 24 hours of storage are fish that are soaked in a 2.5% (T4) chitosan solution at either 20, 40, or 60 minutes of soaking time.
Analisis Fase Karbon Pada Pemutih Gigi Berbasis Arang Aktif Tempurung Kelapa Dengan Metode Difraksi Sinar-X (XRD) Muna Alfira; Made Sumadiyasa; K. N. Suarbawa; Nyoman Wendri
BULETIN FISIKA Vol 25 No 1 (2024): BULETIN FISIKA February Edition
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2024.V25.i01.p16

Abstract

Now there are many teeth whitening products on the market which are claimed to be made from coconut shell charcoal. Charcoal in a material is in the form of carbon compounds, which can be in the form of graphene (GP), graphene oxide (GO) phases, and/or reduced graphene oxide (rGO). One method to identify the presence of the carbon phase is to use the X-Ray Diffraction (XRD) method. In this study, XRD characterization was carried out on one of the coconut shell charcoal-based tooth whiteners that has been registered with BPOM. Carbon phase analysis was carried out using software Match-3 and Origin 2019a. The results of the analysis showed that the tooth whitening samples contained carbon in the crystal phase of turbostratic graphite and amorphous reduced graphene oxide with a percentage content of 1.48% and 81.69%, respectively. The results also showed the presence of P, Al, and Si metal compounds.
Studi Pemetaan Kerawanan Gempabumi Berdasarkan Pola-Pola Sesar Menggunakan Focal Mechanism dari Data Gempabumi di Wilayah Bali Crisanti Uduk, Maria; Sukarasa, I Ketut; Tyastama, Arief; Suarbawa, Komang Ngurah; Wendri, Nyoman; Sandi, I Nengah
Kappa Journal Vol 9 No 1 (2025): April
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v9i1.29374

Abstract

Research regarding earthquake vulnerability mapping studies based on fault patterns using focal mechanism data from earthquake data in the Bali Region has been carried out. This research aims to determine fault patterns in the Bali region using a focal mechanism from earthquake data for 1976-2021, determine the types of faults in the Bali region when analyzed using the focal mechanism method and determine areas that are prone to earthquakes in the Bali region. The data used are seismograph recordings obtained from the Global Centroid Moment Tensor (CMT) and the United States Geological Survey (USGS). The method used in this research is the focal mechanism method. The results of mapping the distribution of focal balls in the Bali region are that there were 9 earthquake events above 4 M, with 8 events being thrust faults and 1 being an oblique fault. Areas that are prone to earthquakes are in the East Bali region, specifically in Karangasam, and in general earthquakes occur in water areas or at sea. The results of the seismicity map of the distribution of earthquakes show that the depth of earthquakes in the Bali region varies. On the seismicity map, it can be seen that the most dominant ones are earthquakes in the deep and medium earthquake categories, but the most dangerous are earthquakes in the shallow depth category.
Comparison of Seismicity Between the Subduction Zone and Local Fault Zone in the Bali Island Region During the 1963–2023 Period Using the Likelihood Method Nainggolan, Putri Srimalemta; Winardi Tjahyo Baskoro; I Gusti Ketut Satria Bunaga; I Ketut Sukarasa; Nyoman Wendri; I Ketut Putra
Kappa Journal Vol 9 No 2 (2025): Agustus
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v9i2.30243

Abstract

Research has been conducted on the comparison of seismicity between the subduction zone and the local fault zone in the Bali Island region during the 1963–2023 period. This research aims to compare the b-value, a-value, seismicity index, and earthquake recurrence period between the subduction zone and the local fault zone. The research was conducted within the observation boundaries of 114,4°–115,7° East Longitude and 11,4°–8,8° South Latitude. The research was carried out at the Center for Meteorology, Climatology, and Geophysics Region III Denpasar using the likelihood method for earthquakes with magnitude ≥ 3,3. The data used were obtained from the official websites of the USGS (United States Geological Survey) and BMKG, with depths ≤ 600 km for the subduction zone and depths ≤ 35 km for the local fault zone. The results show that the subduction zone has a b-value of 0,534 and an a-value of 4,599, while the local fault zone has a b-value of 0,829 and an a-value of 5,087. The seismicity index in the subduction zone ranges from 0,289–13,046 with an earthquake recurrence period of 0,077–3,459 years. Meanwhile, in the local fault zone, the seismicity index ranges from 0,126–8,366 with an earthquake recurrence period of 0,212–7,949 years. Earthquake distribution is dominated in the subduction zone at 82,63% compared to the local fault zone at 17,37%.
Analisis Dosis Serap pada Pemeriksaan Thorax Pasien Anak dengan Pesawat Sinar-X di Instalasi Radiologi RSUD Sanjiwani Gianyar Br Barus, Ema Vinesia; Ratini, Ni Nyoman; Trisnawati, Ni Luh Putu; Sandi, I Nengah; Wendri, Nyoman; Alit Paramarta, Ida Bagus
Kappa Journal Vol 9 No 2 (2025): Agustus
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v9i2.30101

Abstract

Telah dilakukan penelitian mengenai analisis dosis serap pada pemeriksaan thorax pasien anak dengan pesawat sinar-X di Instalasi Radiologi RSUD Sanjiwani Gianyar. Penelitian ini bertujuan untuk menganalisis dosis serap yang diterima oleh pasien anak pada pemeriksaan thorax serta membandingkannya dengan batas dosis yang direkomendasikan oleh United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR). Penelitian ini dilakukan dengan metode kuantitatif menggunakan data sekunder dari hasil pemeriksaan thorax pasien anak berusia 1-15 tahun yang meliputi faktor eksposi (tegangan tabung, kuat arus, dan waktu eksposi). Data ini yang kemudian digunakan untuk menghitung dosis paparan dan dosis serap. Analisis statistik dilakukan dengan uji Kruskall-Wallis untuk menentukan signifikansi perbedaan dosis serap di RSUD Sanjiwani Gianyar dengan dosis serap yang ditetapkan oleh UNSCEAR. Hasil penelitian menunjukkan bahwa terdapat variasi dosis serap berdasarkan kelompok usia, di mana semakin tinggi usia pasien, semakin besar dosis serap yang diterima. Didapatkan dosis serap untuk kelompok usia 1-4 tahun yaitu:  mGy untuk pasien laki-laki dan  mGy untuk pasien perempuan. Untuk kelompok usia 5-9 tahun didapatkan sebesar mGy untuk pasien laki-laki dan  mGy untuk pasien perempuan. Sedangkan dosis serap kelompok usia 10-15 didapatkan sebesar  mGy untuk pasien laki-laki dan  mGy untuk pasien perempuan. Dosis serap yang diperoleh di RSUD Sanjiwani masih berada di bawah batas dosis maksimum yang ditetapkan oleh UNSCEAR yaitu: untuk kelompok usia 1-4 tahun sebesar 0,0300 mGy, kelompok usia 5-9 tahun sebesar 0,0400 mGy, dan kelompok usia 10-15 sebesar 0,0500 mGy.
DETERMINATION OF HALF AND TENTH VALUE LAYER PRIMARY AND SECONDARY WALLS OF X-RAY ROOM IN BALI JIMBARAN GENERAL HOSPITAL Widianingsih, Ni Kadek Indah; Sutapa, Gusti Ngurah; Kasmawan, I Gde Antha; Sandi, I Nengah; Baskoro, Winardi Tjahyo; Wendri, Nyoman; Prayuda, I Made Ardi
Indonesian Physical Review Vol. 6 No. 3 (2023)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v6i3.250

Abstract

The research has been carried out on the HVL and TVL values ​​of the primary and secondary walls of the radiology installation radiology room at RSU Bali Jimbaran. The aims of this study were (1) to determine HVL and TVL values ​​on the primary and secondary walls in the x-ray room, (2) to determine the differences between HVL and TVL values ​​if the tube voltages are varied. In determining the HVL and TVL values, ​​the linear attenuation coefficient of the walls must be known. The linear attenuation coefficient was determined by measuring the wall thickness by using a caliper, and measuring the radiation dose rate before and after passing through the primary and secondary walls. The results of the analysis of the HVL and TVL values ​​on the primary wall were 1.668 cm and 5.540 cm, meanwhile on the secondary wall ​​were 1.915 cm and 6.362 cm. When the voltage was varied 40 kV, 50 kV, 60 kV and 70 kV, there was no difference in the HVL or TVL values. Based on the results of the analysis, the HVL and TVL values ​​on the primary and secondary walls have a significant average difference.
Co-Authors Alit Paramarta, Ida Bagus Aprilion Krisandi Aulia Nur Aisah Baskoro, Winardi Tjahyo Br Barus, Ema Vinesia Crisanti Uduk, Maria Decky Danuarta Fernanda Feliatra Gusti Ngurah Sutapa Hery Suyanto I B. Sujana Manuaba I Gde Antha Kasmawan I Gede Didi Jimbarwan I Gusti Ayu Made Srinadi I Gusti Ketut Satria Bunaga I Gusti Putu Yoyok Irawan I Ketut Putra I Ketut putra, I Ketut I Nengah Sandi I Putu Eddy Aditya Harrischandra I Wayan Supardi I.K.G. Sukarsa Ida Bagus Made Suryatika IGA Putra Adnyana IGN Agung Dwijaputra K N Suarbawa K. Jayanegara K. N. Suarbawa K.N. Suarbawa Komang Ngurah Suarbawa M. Susilawati Made Sumadiyasa Made Susilawati Muna Alfira N. L. P. Sarasmitha Nainggolan, Putri Srimalemta Nandar Cundara, Nandar Nasution, Ali Napiah Ni Luh Putu Anggreni Ni Made Yuliantini Ni Nyoman Rupiasih Ni Nyoman, Ratini Ni Wayan Eri Sandriani Ni Wayan Sariasih Nurmalasari, Ni Putu Yuni P. Suardana Prayuda, I Made Ardi Putra Adnyana, IGA Putu Ekayani Sri Tussniari Ratu, Trivena Sesilia Rio Saputra S. S. Jagtap Satriya Wibawa, I Made Sukarasa, I Ketut Trisnawati, Ni Luh Putu Tyastama, Arief Wayan Gede Suharta Widianingsih, Ni Kadek Indah Winardi Tjahyo Baskoro Yosefa Yakunda Tandu Zainal Arifin