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All Journal Buletin Udayana Mengabdi BULETIN FISIKA
Winardi Tjahyo Baskoro
Program Studi Fisika, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Udayana
Earth & Planetary Sciences Education Electrical & Electronics Engineering Environmental Science Materials Science & Nanotechnology Physics

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ANALISIS PENGARUH KEKERASAN KARET TERHADAP SENSOR WEIGHT IN MOTION (WIM) BERBASIS SERAT OPTIK Desi Delimasari; Winardi Tjahyo Baskoro; Dwi Hanto
BULETIN FISIKA Vol 16 No 2 (2015): 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

Conducted a research on the analysis of the effect of rubber hardness on the capacity of the sensor Weight In Motion (WIM). Observation conducted on the sensors WIM using microbending techniques, multimode optical fiber and stable laser source with a wavelength of 1610 nm. This research using rubbers with hardness is 40 kN/mm, 50 kN/mm and 60 kN/mm. Research capacity of the sensor WIM with compression test using UTM (Universal Testing Machine) in static state. The result showed that the sensors WIM is faster response for rubber hardness 60 kN/mm with a capacity of 770 N. Whereas the maximum load of 3485 N in rubber hardness 40 kN/mm, so the rubber with a hardness of 40 kN/mm is good use in applying sensors WIM to control and detect the vehicle load with overload.Keywords : Rubber, sensors capasity, Weight In Motion, microbending, multimode optical fiber, static
ANALISA TIME LAG SUHU PERMUKAAN LAUT YANG BERHUBUNGAN DENGAN CURAH HUJAN RATA-RATA DASARIAN DI PROVINSI BALI I Made Sudarma Yadnya; Winardi Tjahyo Baskoro; M. Dwi Jendra Putra
BULETIN FISIKA Vol 16 No 2 (2015): 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

Variability of rainfall a region often associated with global weather conditions, regional and local areas. Effect of local weather parameters such as sea surface temperatures (SST) around the island of Bali is still needs to be studied to determine its relationship with the average dasarian (accumulated ten days) rainfall variability of each regency/municipality in the province of Bali especially associated with the time lag. Value of correlation coefficient between the average dasarian of SST around Bali at time lag 0, -1 dasarian, -2 dasarian, and -3 dasarian with the average dasarian rainfall of each regency/municipality in the province of Bali is quite varies, where the lowest value of the correlation coefficient is 0.099 and the highest is 0.587. The average dasarian of SST around Bali island on time lag -1 dasarian have correlation values higher than the time lag 0, -2 and -3 dasarian. The sea surface temperatures of sea area Southeast and Southwest Bali island tend to have a fairly strong correlation with the average dasarian rainfall of each regency/municipality in Bali with an average value of correlation coefficients for each time lag ranging from 0.403 - 0.467.Keywords : sea surface temperature, rainfall, time lag
PENGENALAN TEKNOLOGI PENGERINGAN CABAI UNTUK KELOMPOK TANI DI SEKARTAJI TABANAN I.G.A. Kasmawan; G. N. Sutapa; I. M. Yuliara; N. N. Ratini; W. T. Baskoro; N. L. P. Trisnawati
Buletin Udayana Mengabdi Vol 20 No 3 (2021): Buletin Udayana Mengabdi
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (462.045 KB) | DOI: 10.24843/BUM.2021.v20.i03.p03

Abstract

Harga cabai yang turun saat panen melimpah tentu sangat merugikan petani. Hal tersebut perlu segera ditangani dengan cara memperlama masa simpan cabai menggunakan tekonologi tepat guna melalui program pengabdian kepada mayarakat. Tujuan program tersebut adalah memperkenalkan teknik pengeringan cabai menggunakan alat pengering cabai. Metode pelaksanaan pengabdian menggunakan metode ceramah interaksif dan praktek tentang teknologi pengolahan produk cabai mentah hingga menjadi cabai kering menggunakan alat pengering cabai. Hasil yang diperoleh adalah terciptanya alat pengering cabai sederhana berbahan bakar gas. Alat tersebut dibangun menggunakan kombinasi bahan logam (90%) dan kayu (10%) berukuran 80 x 50 x 120 cm3, dengan daya tampung hingga ± 7 kg cabai rawit mentah. Cabai rawit merah dan cabai rawit hijau mengalami penyusutan berat masing-masing sekitar 80% dan 90% dengan warna produk sangat kontas. Proses pengeringan dengan alat pengering lebih cepat (6 jam) dibandingkan dengan cara konvensional (7-10 hari). Berdasarkan hasil kuisioner, tingkat keberhasilan pelaksanaan program pengabdian tersebut di atas 90%.
Penentuan Besar Dosis Pasien Pada Computed Tomography Scan Kepala Terhadap Faktor Risiko Terjadinya Katarak Menggunakan Metode Size-Specific Dose Estimate (SSDE) Shinta Palupi; Ni Luh Putu Trisnawati; Winardi Tjahyo Baskoro; Rozi Irhas
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.p05

Abstract

Research has been done on determining the patient's dose on a Computed Tomography (CT) Scan of the head using the Size Specific Dose Estimate (SSDE) method and the risk factors for cataracts. SSDE values ??were obtained from Computed Tomography Dose Index Volume (CTDIvol), Anterior Posterior (AP) and Lateral (LAT) values. Data were obtained from 30 patients in the group of children aged 5-14 years and 30 patients in the adult group aged 15-50 years. The mean SSDE value for the children group was 52.387 mGy and the average value for the adult group was 49.664 mGy. The mean SSDE value of children is greater than that of adult patients, this is because the diameter of the head of the children group is smaller than the diameter of the head of the adult group. One organ that is sensitive to X-ray radiation is the eye lens. If the lens of the eye gets more than 500 Gy of radiation, it will increase the risk of cataracts. The risk factor for cataract was obtained from the SSDE value and the eye lens tissue weight factor was 0.12. The risk of cataract in this study is still below the standard value set by the ICRP in 2011 which is 500 mGy. While the percentage risk of cataract occurrence for the children group was 1.257% and for the adult group was 1.192%.
Analisis Klimatologi di Bandar Udara I Gusti Ngurah Rai tahun 2021 Astried Valentine Kaha; Winardi Tjahyo Baskoro; Agus Yarcana
BULETIN FISIKA Vol 25 No 2 (2024): 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

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2024.V25.i02.p01

Abstract

Abstrak – Telah dilakukan Praktik Kerja Lapangan (PKL) tentang periode dan frekuensi kejadian iklim di Bandara I Gusti Ngurah Rai mengalami kondisi buruk. PKL ini bertujuan untuk mengetahui kondisi cuaca dan iklim di Bandara I Gusti Ngurah Rai pada tahun 2021. Adapun data yang digunakan pada PKL ini yaiu data Aerodrome Climatological Summary (ACS) yang mencakup beberapa parameter yaitu visibility, temperatur udara, ketinggian awan, serta arah dan kecepatan angin. Hasil yang didapat setelah mengolah data ACS tahun 2021 di Bandara I Gusti Ngurah Rai, periode iklim mengalami kondisi buruk sering terjadi pada bulan Oktober – April dan Juni. Kondisi iklim buruk yang dipengaruhi oleh kecepatan angin yaitu pada bulan Juni dan Desember dengan frekuensi 0,07% dan 0,14 %. Kondisi iklim buruk yang dipengaruhi oleh temperatur yaitu pada bulan Maret dan April dengan frekuensi 0,01 % dan 0,09 %. Kemudian, kondisi iklim buruk yang dipengaruhi oleh visibility yaitu pada Juni, Oktober – Maret dengan frekuensi tinggi pada bulan Januari - Februari sebesar 0,7 % dan 0,6 %. Adapun kondisi iklim buruk yang dipengaruhi oleh ketinggian awan terjadi hampir setiap bulan dengan frekuensi tertinggi pada bulan Januari sebesar 12,23 %. Kata kunci: ACS, visibility, temperatur, ketinggian awan, kecepatan angin.
Penyesuaian Nilai Percepatan Tanah Maksimum Berdasarkan Modifikasi Konstanta Atenuasi dengan Data Accelerograph Tahun 2020-2023 Wilayah Bali Mayumi Cahyandari; Winardi Tjahyo Baskoro; I Putu Dedy Pratama; I Made Yuliara; Hery Suyanto; I Gde Antha Kasmawan
BULETIN FISIKA Vol 25 No 2 (2024): 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

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2024.v25.i02.p12

Abstract

This study aims to determine the empirical formula model of maximum ground acceleration (PGA) in the Bali region by modifying the attenuation constant based on accelerograph data from 2020-2023 obtained from the BMKG Class II Sanglah Geophysical Station. The data used consists of 443 accelerograph recordings from 146 earthquake events, with a coverage area of ??113.51 ° - 115.83 ° E and 12.56 ° - 7.71 ° S. Through linear regression analysis, the empirical PGA model for the Bali region is obtained: log10 PGA = (-1.817) log10 (R) + (0.809) M - 0.089. This model is also compared with the attenuation model from Donovan, Setiawan, and Lin and Wu, with the results showing that the developed model has a very strong correlation of 0.782 between the PGA from observations and the PGA from the model which is included in the very strong category. In addition, the MSE value of 0.209 and RMSE of 0.457 from this model indicate that the model has a good level of accuracy in predicting PGA values. These findings provide a significant contribution in improving seismic risk prediction in the Bali region, which can be used as a basis for more effective disaster mitigation planning.
Relokasi Hiposenter Gempabumi dengan Menggunakan Metode Double Difference Wilayah Bali dan Sekitarnya Devi Irma Putri; I Ketut Sukarasa; Rudy Darsono; Winardi Tjahyo Baskoro; Ni Nyoman Wendri; I Made Satriya Wibawa
BULETIN FISIKA Vol 25 No 2 (2024): 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

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2024.v25.i02.p04

Abstract

A study on the relocation of earthquake hypocenters using the Double Difference method has been conducted in Bali and its surrounding areas. This research was carried out at the Center for Meteorology, Climatology, and Geophysics Region III Denpasar. The purpose of this study is to find out the distribution of earthquake hypocenters before and after the relocation and to know the continuity of earthquake hypocenters in the Bali region. The data used are arrival time data of 1,815 earthquake events from January 1, 2014 to December 31, 2023, and data from 26 earthquake recording stations. The relocation method applied is the Double Difference method, which is processed with ph2dt and HypoDD. The relocation that has been carried out shows a good hypocenter position which is characterized by a residual value of travel time that is close to 0. The distribution of the earthquake hypocenter in the Bali area before the relocation spread throughout the region and after the relocation, the position of the hypocenter was getting closer to the source of the earthquake, namely in the subduction zone under the Bali area as shown in the cross-section results. In addition, based on the results of the analysis of the hypocenter of the earthquake after relocation, it was found that the trend of the hypocenter continued toward the subduction subduction zone.
Co-Authors Agus Yarcana Astried Valentine Kaha Desi Delimasari Devi Irma Putri Dwi Hanto Gusti Ngurah Sutapa Hery Suyanto I Gde Antha Kasmawan I Gde Antha Kasmawan I Made Sudarma Yadnya I Made Yuliara I Putu Dedy Pratama I. M. Yuliara M. Dwi Jendra Putra Mayumi Cahyandari N. L. P. Trisnawati Ni Luh Putu Trisnawati Ni Nyoman Wendri Ni Nyoman, Ratini Rozi Irhas Rudy Darsono Satriya Wibawa, I Made Shinta Palupi Sukarasa, I Ketut