Judul: Study of Land Use Change Before and After  the Tsunami Using Satellite Imagery in Panimbang District, Banten
Abstrak: Pesisir Kecamatan Panimbang, Kabupaten Pandeglang, Provinsi Banten merupakan salah satu wilayah yang terdampak bencana tsunami Selat Sunda pada 22 Desember 2018 yang mengakibatkan kerusakan pesisir. Tujuan dari penelitian ini yaitu mengetahui perubahan penggunaan lahan pasca tsunami yang terjadi di Pesisir Kecamatan Panimbang, Kabupaten Pandeglang, Provinsi Banten pada tahun 2018 menggunaan citra Sentinel-2A tahun 2018 dan 2021, menggunakan algoritma Maximum Likelihood. Klasifikasi menghasilkan 5 kelas yaitu, hutan, perkebunan, sawah, permukiman, dan pasir dengan luas total 9983.98 ha. Luas perkebunan menurun sebesar 2212.07 ha dengan persentase penurunan 22.16%. Kelas permukiman mengalami penurunan luas sebesar 63.52 dengan persentase penurunan 0.64%. Kelas pasir mengalami peningkatan luas sebesar 40.56 ha dengan persentase 0.41%. Hutan mengalami peningkatan luas sebesar 1215.48 ha dengan persentase 12.17%. Sawah mengalami peningkatan luas sebesar 1019.55 ha dengan persentase 10.21%. Akurasi (overall accuracy) klasifikasi penggunaan lahan tahun 2018 dan 2021 berturut-turut sebesar 90.37% dan 90.55%., The coastal Panimbang District, Pandeglang Regency, Banten Province is one of the areas affected by the Sunda Strait tsunami disaster on December 22, 2018, which caused coastal damage. The purpose of this study is to determine land use changes after the tsunami that occurred on the coast of Panimbang District, Pandeglang Regency, Banten Province 2018 using Sentinel-2A imagery in 2018 and 2021, using the Maximum Likelihood algorithm. The classification produces 5 classes, namely, forests, plantations, rice fields, settlements, and sand with a total area of 9983.98 ha. The plantation area decreased by 2212.07 ha with a percentage decrease of 22.16%. The residential class experienced a decrease in the area by 63.52 with a percentage decrease of 0.64%. The sand class experienced an increase in the area of 40.56 ha with a percentage of 0.41%. The forest experienced an increase in the area of 1215.48 ha with a percentage of 12.17%. Rice fields experienced an increase in the area of 1019.55 ha with a percentage of 10.21%. The overall accuracy of land use classification in 2018 and 2021 was 90.37% and 90.55%, respectively.
Keyword: Coastal, Land Use, Maximum Likelihood, Tsunami, Penggunaan Lahan, Pesisir

Judul: Spatial Distribution of Tidal Flood Areas in Coastal Areas of Pandeglang Regency, Banten Using Landsat 8 OLI Imagery
Abstrak: Banjir rob merupakan kejadian meluapnya air laut saat pasang sehingga menyebabkan adanya genangan pada daratan yang memiliki elevasi tanah yang rendah. Fenomena ini sering ditemukan pada wilayah pesisir, seperti di pesisir Kabupaten Pandeglang. Penelitian ini bertujuan untuk mengetahui sebaran luasan banjir rob di Pesisir Kabupaten Pandeglang, Banten menggunakan metode sistem informasi geospasial. Sebaran genangan banjir diperoleh dari pemisahan wilayah daratan dan perairan menggunakan ekstraksi citra Landsat 8 OLI yang akan disesuaikan dengan data elevasi tanah dari DEMNAS dan faktor lain yang mempengaruhinya seperti penurunan muka tanah, kecepatan dan arah angin bertiup, curah hujan dan pasang surut pada lokasi penelitian. Dari hasil analisis data pada bulan Desember didapatkan bahwa, pasang air laut tertinggi memiliki ketinggian 0,736 m, curah hujan tertinggi pada sebesar 25,6 mm per hari, dengan arah angin yang didominasi menuju ke arah timur dengan kecepatan 3.60 m/s – 8.80 m/s dan penurunan muka tanah terbesar sebesar 14 cm dari tahun 2019 – 2020 yang berada di Kecamatan Panimbang. Berdasarkan penelitian ini dapat diperlihatkan bahwa hasil sebaran genangan banjir di Kabupaten Pandeglang memiliki luasan sebesar 1.232 ha atau 3,64% dari luasan pesisir Kabupaten Pandeglang dengan 4 kecamatan yang terdampak banjir., Coastal flooding is the overflow of seawater during high tide caused inundation in a low elevation area. This phenomenon is often found in coastal areas, such as on the coast of Pandeglang Regency. This study aimed to determine the distribution of the tidal flood area in the Pandeglang Coast, Banten using the geospatial information system method. The distribution of flood inundation is obtained from the separation of land and water areas with the use of Landsat 8 OLI imagery extraction which will be adjusted to land elevation data from DEMNAS and other factors that influence it such as land subsidence, wind speed and direction, rainfall and tides at the research location. After the analysis was done results in December 2020 showed that the highest tide happened was 0.736 m, The highest rainfall was 25.6 mm per day, with the wind direction dominated towards the west with a speed of 3.60 m/s – 8.80 m/s and the largest land subsidence is 14 cm in 2019 - 2020 which is located in Panimbang District. After combining the data, the distribution of flood inundation in Pandeglang Regency showed that there was 1,232 ha or 3.64% of an inundated area in the coastal area of Pandeglang Regency with 4 sub-districts affected by the flood.
Keyword: Banjir rob, Luasan Spasial, Penurunan Muka Tanah, Kabupaten Pandeglang

Judul: Sintesis dan Pencirian Kompleks Fe(III)-Kuersetin
Abstrak: Quercetin belongs to flavonols which is able to chelate metal ions. Quercetin may chelate metal ions at 3’,4’-catechol, 3- or 5-hydroxycromone sites. In this study, quercetin was complexed with Fe(III). The complex with Fe(III) ions from FeCl3·6H2O was more stable than the complex derived from Fe(NO3)3·9H2O. The quercetin was yellow in color and showed maximum wavelengths (λ􀭫􀭟􀭶) at 250 and 370 nm. The Fe(III)-quercetin complex from Fe(NO3)3·9H2O was yellowish green with 􀟣􀭫􀭟􀭶 at 280 and 420 nm, whereas that from FeCl3·6H2O was dark green with 􀟣􀭫􀭟􀭶 at 280 and 430 nm. The 􀟣􀭫􀭟􀭶 shift indicated that the complex was formed at 3-hydroxychromone site. The Fe(III)- quercetin complex was formed with 1:1 metal-ligand mole ratio based on atomic absorption spectrophotometry analysis and the X-ray diffractogram showed that the crystallinity of the complex was 37%.
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