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All Journal Journal of Geoscience, Engineering, Environment, and Technology Jurnal Ilmiah Samudra Akuatika Jurnal Malikussaleh Mengabdi
Mainisa
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Phenoxycarboxlic acid Toxicity Test on Vannamei Shrimp (Litopenaeus vannamei) Mortality Lisna Lisna; Mainisa; Erlangga Erlangga; Saiful Adhar; Munawwar Khalil
Jurnal Ilmiah Samudra Akuatika Vol 7 No 1 (2023): Jurnal Ilmiah Samudra Akuatika
Publisher : Fakultas Pertanian Universitas Samudra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33059/jisa.v7i1.7754

Abstract

This study aims to examine the toxicity of phenoxy acid herbicides on vannamei shrimp mortality, by conducting preliminary tests, persistence tests, mortality tests, and water quality. The research design used the regression method and probit analysis with 6 treatments and 3 replications, namely A herbicide concentration of 0 ml/L, B herbicide concentration DMA-6, 0.025 ml/L water, C herbicide concentration DMA-6, 0.005 ml/L water, D DMA-6 herbicide concentration, 0.075 ml/L water, E DMA-6 herbicide concentration, 0.1 ml/L water and F DMA-6 herbicide concentration, 0.125 ml/L water. Pesticides do not affect temperature changes, dissolved oxygen (DO), Salinity, and pH. Clinical symptoms due to Pesticide exposure to vanamei shrimp are irregular movements, shells peeling off, and swimming close to aeration until they die. The LC50 value in the herbicide toxicity test was 0.124 mg/l at 24 hours, 0.099 mg/l at 48 hours, 0.073 mg/l at 72 hours, and 0.026 mg/l at 96 hours.
A Response of Water Temperature to Wind Speed and Air Temperature in Lake Laut Tawar, Aceh Province, Indonesia Adhar, Saiful; Mainisa; Andika, Yudho
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 3 (2024): JGEET Vol 09 No 03 : September (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.3.14469

Abstract

Changes in water temperature impact the dynamics of lake ecosystems. Changing climate factors, including wind speed and air temperature, influence the water temperature of lakes. This research aims to analyze the response of water temperature to wind speed and air temperature in Lake Laut Tawar. Observations were conducted from August to September 2023, with a sampling frequency of every two weeks. The results revealed that water temperature, wind speed, and air temperature in Lake Laut Tawar fluctuated according to the presence of light, namely day and night factors. Variations in sunlight intensity lead to hourly fluctuations in air temperatures, while wind speeds vary hourly due to changes in air pressure, consequently resulting in hourly variations in water temperature as well. During daylight hours, air temperature surpasses water temperature, whereas during nighttime hours, water temperature exceeds air temperature. Heat transfer from the air to the water contributes to an increase in water temperature, while the release of heat energy from the surface water into the air leads to a decrease in water temperature. Changes in the water temperature of Lake Laut Tawar are primarily influenced by changes in wind speed and air temperature by 80 percent simultaneously. However, while air temperature showed a partial response, wind speed did not exhibit a significant response. The relationship between these variables can be expressed through a mathematical model Tw = 0.356 Ta + 0.025 W + 15.674, where Tw is water temperature (°C), Ta is air temperature (°C), and W is wind speed (km/minute). Another factor that influences the water temperature of Lake Laut Tawar is the inlet water temperature, which was not observed in this research.
Peningkatan Partisipasi Pendidikan Tinggi Melalui Sosialisasi Fakultas Pertanian Universitas Malikussaleh di Kawasan Tapanuli, Sumatera Utara Rahman, Arief; Hatta, Muhammad; Mainisa; Yurni, Irma; Khaidir; Syamni, Ghazali
Jurnal Malikussaleh Mengabdi Vol. 4 No. 1 (2025): Jurnal Malikussaleh Mengabdi, April 2025
Publisher : LPPM Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/jmm.v4i1.22034

Abstract

Tingkat partisipasi siswa sekolah menengah dalam pendidikan tinggi masih tergolong rendah di Tapanuli khususnya di Kota Sibolga, Kabupaten Tapanuli Selatan, dan Kabupaten Tapanuli Tengah. Kondisi ini menunjukkan perlunya strategi intervensi yang terarah dan berkelanjutan. Artikel ini mengulas program sosialisasi perguruan tinggi sebagai salah satu pendekatan untuk meningkatkan partisipasi tersebut. Metode yang digunakan mencakup penyuluhan langsung di sekolah, penyebaran informasi melalui media sosial dan aplikasi WhatsApp, serta pendekatan motivasional berbasis komunitas. Hasil kegiatan menunjukkan peningkatan signifikan dalam berbagai aspek pemahaman siswa. Pemahaman mengenai jalur masuk perguruan tinggi meningkat dari 30% menjadi 85%, pengetahuan tentang beasiswa dari 25% menjadi 80%, pemahaman terhadap prospek karier dari 20% menjadi 70%, dan minat untuk melanjutkan studi dari 40% menjadi 75%. Selain itu, sebanyak 215 siswa tergabung aktif dalam grup WhatsApp sebagai indikator minat berkelanjutan terhadap pendidikan tinggi, dengan partisipasi konkret pada jalur SNBP (61 siswa), SNBT (30 siswa), dan jalur mandiri (5 siswa). Meskipun program ini menunjukkan perkembangan yang signifikan, beberapa tantangan masih perlu mendapatkan perhatian, seperti rendahnya keterlibatan orang tua, terbatasnya akses informasi di wilayah pedesaan, serta kendala finansial yang dihadapi calon mahasiswa. Sebagai tindak lanjut, disarankan agar program sosialisasi mendatang melibatkan orang tua secara aktif, menyediakan informasi beasiswa secara komprehensif, serta menyelenggarakan pendampingan berkelanjutan guna mendorong peningkatan partisipasi pendidikan tinggi dan memperkuat pembangunan sumber daya manusia di kawasan tersebut.
Co-Authors Andika, Yudho Arief Rahman Erlangga Erlangga Ghazali Syamni Khaidir Lisna Lisna Muhammad Hatta Munawwar Khalil, Munawwar Saiful Adhar Yurni, Irma