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Warjono, Warjono
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Pengaruh Latihan Zig-Zag Run Terhadap Kecepatan Tendangan Samping (T) Pada Siswa Ekstrakurikuler Pencak Silat di SMA Negeri 1 Sukagumiwang Kabupaten Indramayu Warjono, Warjono; Fahrudin, Fahrudin; Sumarno, Ardawi
Jurnal Ilmiah Wahana Pendidikan Vol 9 No 23 (2023): Jurnal Ilmiah Wahana Pendidikan
Publisher : Peneliti.net

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.10428658

Abstract

This study aims to determine the effect of the zig-zag run training method on side kick speed (T) in martial arts extracurricular students at SMA Negeri 1 Sukagumiwang, Indramayu Regency. This research uses quantitative methods. The population in this study were 20 students. This study used a total sampling technique, because researchers took the entire population. Data processing was carried out using SPSS Software Version 25. Instrument analysis carried out was Validity and reliability. While the data analysis technique used is normality test, homogeneity and hypothesis testing which consists of Chi-square analysis, Levene test and t-test using the independent t-test. Based on the normality test, it can be seen if the data is normal because Sig. > 0.05, that is, in the pretest control group, a score of Lo = 0.566 was obtained, then the post-test results obtained a score of Lo = 0.854. Levene test is obtained if Sig. > 0.05, namely the value of Sig. 383 > 0.05 which indicates that the data is homogeneous. The independent t-test is obtained if the sig. (2-tailed) < 0.05, namely the sig. (2-tailed) = 0.004 less than the significance level (a) = 0.05, H0 is rejected and H1 is accepted, meaning there is an influence. The conclusion in this study is that there is an effect of the zig-zag run training method on the speed of side kicks (T) in pencak silat extracurricular students at SMA Negeri 1 Sukagumiwang, Indramayu Regency.
Identification of the causes of convective clouds in extreme rainfall events with hail based on dual-polar radar imagery Rafi, Rayhan; Kuncoro, Dwi; Arzhida, Bima; Jannah Indriyani, Noor; Warjono, Warjono
Jurnal Penelitian Saintek Vol 30, No 2 (2025)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v30i2.89950

Abstract

This study aims to analyze the atmospheric dynamics behind the formation of convective clouds that produce hail through a multi-instrumental approach. The methods used include streamline map analysis, synoptic data from the Yogyakarta Climatology Station, Himawari-9 HCAI satellite imagery, and dual-polar radar data from the Ahmad Yani Meteorological Station. The results reveal local wind convergence and significant air pressure drop, triggering rapid and intensive formation of Cumulonimbus clouds. Radar products, such as CMAX and HAILSZ, indicate high reflectivity and the presence of large hail particles within the clouds. Hail size is estimated to range from 10–20 mm with a probability of more than 80%. Rain validation shows the highest accumulation of 74 mm/day in Minggir District, Sleman. This study emphasizes the importance of integrating satellite, radar, and surface observation data for detecting extreme weather in tropical regions.
Co-Authors Arzhida, Bima Fahrudin Fahrudin Jannah Indriyani, Noor Kuncoro, Dwi Rafi, Rayhan Sumarno, Ardawi