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All Journal INTERNATIONAL JOURNAL OF ENVIRONMENT AND GEOSCIENCES Bakti Cendana: Jurnal Pengabdian Masyarakat
Chonnaniyah, Chonnaniyah
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Earth & Planetary Sciences Education Environmental Science Nursing Social Sciences

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Internal solitary waves observation and feature extraction based on wavelet transform by Sentinel-1A in Lombok Strait, Indonesia Chonnaniyah, Chonnaniyah; Osawa, Takahiro; Karang, I Wayan Gede Astawa
International Journal of Environment and Geosciences Vol 5 No 1 (2024): International Journal of Environment and Geosciences
Publisher : Graduate Study of Environmental Sciences, Postgraduate Program of Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/ijeg.2024.v05.i01.p05

Abstract

Lombok Strait is an essential pathway in trans-oceanic water mass transport. Due to this water mass transport flowing over Indonesian waters, the current is known as Indonesian Throughflow (ITF), which plays a role in the transfer of warm water masses from the Pacific to the Indian Ocean annually. Lombok Strait has intensive characteristics of the internal waves (IWs) generation because of the strong current that passes through the complex bathymetry along the strait area. IWs with large amplitude and nonlinear properties are known as Internal Solitary Waves (ISW) that can be detected by Synthetic Aperture Radar (SAR) images. A Wavelet Transform method for ISW feature extraction was applied to SAR images by Sentinel-1A (C-band). ISW packet characteristics can be distinguished from other phenomena based on their geometrical structure and shape. ISW packet pattern consists of light and dark lines which decrease intensity from front to rear. SAR observation detected 5 parameters (phase speed, soliton numbers, wavelength, first crest length, and propagation direction). The arc-like ISW in the Lombok Strait propagated to the North of the sill with average phase speeds of about 2.13 m/s and was frequently detected during the northwest monsoon (NWM). The detected soliton number is less than 6 solitons per packet with a wavelength of about 1 – 4 km, and the first crest length varies from about 12.16 km to more than 100 km. ISW detected in Sentinel-1A images were located at the bathymetry about 800 meters around the Lombok Strait area.
Bimbingan Belajar Gratis Mata Pelajaran Matematika Tingkat SD di Yayasan Kencana Bakti Semesta (YKBS) Badung Bali Rahmawati, Suci; Chonnaniyah, Chonnaniyah; Lestari, Windy
Bakti Cendana Vol 6 No 1 (2023): Bakti Cendana: Jurnal Pengabdian Masyarakat
Publisher : LPPM Universitas Timor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32938/bc.6.1.2023.70-76

Abstract

Parents' hope for their children pursuing formal education is to get maximum test scores and graduate with good grades. Thus, some efforts are made by parents to increase children's understanding of learning. Non-formal education at tutoring institutions is one of the parents' efforts. However, not all parents can provide tutoring facilities through non-formal institutions. Concrete steps are needed from various elements of society to overcome these problems, one of which is a lecturer. Lecturers carry out community service (PKM) by giving free mathematics tutoring at the elementary level within the Badung Bali Kencana Bakti Semesta Foundation (YKBS). The PKM aims to develop good learning habits, increase learning motivation, and increase learning achievement in mathematics. Tutoring is carried out 14 times, held on Wednesdays and Saturdays. The material provided refers to the students' textbooks and worksheets. A series of activity methods, namely (1) warming up through giving motivation to learn (2) explaining the material, (3) questions and answers, (4) quiz, (5) giving gifts, (6) giving post-test. The PKM activity can improve students' learning outcomes, as shown by the post-test results. The development of student motivation also shows good results, shown by the enthusiasm of students who ask for continuous tutoring activities.
Co-Authors I Wayan Gede Astawa Karang Lestari, Windy Suci Rahmawati, Suci Takahiro Osawa