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All Journal Jurnal Ilmu dan Teknologi Kelautan Tropis AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Jurnal Ilmu Sosial dan Humaniora
Nugraha, Teguh
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Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Environmental Science Languange, Linguistic, Communication & Media Library & Information Science Social Sciences

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Karakteristik Pola Arus di Perairan Teluk Jakarta Pada Musim Barat dan Timur: Characteristichs of Current Pattern in Jakarta Bay in The West and East Monsoons Nurjaya, I Wayan; Rastina; Susanti, Santi; Nugraha, Teguh
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 17 No. 1 (2025): Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jitkt.v17i1.41406

Abstract

Jakarta Bay is a coastal area influenced by both natural factors (wind, currents, waves) and human activities (residential areas, coastal development, industry, and resource exploitation). The monsoon phenomenon in the Java Sea affects hydrodynamic patterns, especially current dynamics in Jakarta Bay. This study analyzes changes in current patterns during two distinct monsoon seasons (west and east) in 2021 using a hydrodynamic modeling approach. The model was developed using OpenFlows software with input data including bathymetry, tidal, wind, and wave conditions. Model validation was conducted using tidal and current measurements from field observations in March and August 2021. The results show seasonal variations in current direction and velocity, both in tidal phases and non-tidal (residual) currents. The current patterns aligned with seasonal wind directions, indicating a strong monsoonal influence. Model validation using Root Mean Square Error (RMSE) and Taylor diagram analysis demonstrated good agreement between modeled and observed data, confirming the model's reliability. These hydrodynamic modeling results can serve as a foundation for further studies, such as simulations of pollutant, sediment, and debris dispersion in Jakarta Bay.
Glyphosate Application and Potential Eleusine Indica Resistance in Oil Palm Plantations Muin, Abdul; Wirianata, Herry; Nugraha, Teguh
AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Vol. 7 No. 1 (2023)
Publisher : Asia Pacific Network for Sustainable Agriculture, Food and Energy (SAFE-Network)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29165/ajarcde.v7i1.188

Abstract

Eleusine indica is a grass weed in oil palm plantations, especially during the period of immature crops. The application of glyphosate for weed control shows diverse effectiveness. This study aims to determine the age of susceptible weeds in increasing the effectiveness of glyphosate in controlling E. indica. The study tested the application of glyphosate with three levels (486, 729, and 972 g/ha) at three different weed ages (3, 6, and 9 weeks). E. indica was taken from oil palm plantations that were previously glyphosate-depleted, then sprayed with glyphosate according to the dose studied. Each treatment combination is represented by five pots containing five individual weeds. The results showed that the application of glyphosate aged three and six weeks of higher effectiveness controlled E. indica for doses of 486 and 729 g/ha) than a nine-week application for all doses tested. Regrowth of weeds is found mainly the application of glyphosate at the age of a month of weeks. The development of E. indica's resistance to glyphosate needs attention in oil palm plantations.
Pengaruh Penggunaan Gawai Terhadap Produktivitas Mahasiswa Di Yogyakarta Nugraha, Teguh; Septian, Wigi Fahri; Setiawan, Tuta Ridho
Jurnal Ilmu Sosial dan Humaniora Vol. 2 No. 1 (2026): JANUARI-MARET
Publisher : Indo Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63822/dq990s73

Abstract

This study examines the effect of gadget usage on student productivity in Yogyakarta, a major educational hub in Indonesia. The increasing integration of digital devices into academic life has positioned gadgets as essential learning tools, while simultaneously introducing potential distractions that may reduce productivity. This research employed a quantitative method using a descriptive-explanatory approach. Data were collected through an online questionnaire distributed to 121 active university students in Yogyakarta using purposive sampling. Instrument validity and reliability tests were conducted, followed by classical assumption testing and linear regression analysis using SPSS version 26. The findings indicate that all measurement items are valid and reliable. The regression results show that gadget usage has a statistically measurable effect on student productivity, although its contribution is limited, suggesting that productivity is influenced by multiple interrelated factors beyond gadget usage alone. These findings emphasize that the impact of gadgets on productivity depends largely on usage patterns and self-regulation. Therefore, effective digital self-management is crucial to maximizing the academic benefits of gadget use while minimizing its disruptive effects.
Co-Authors Abdul Muin I Wayan Nurjaya Rastina Santi Susanti, Santi Septian, Wigi Fahri Setiawan, Tuta Ridho Wirianata, Herry