Judul: Sensor Submersible untuk Mengestimasi Tinggi Muka Air di Lahan Gambut Provinsi Jambi
Abstrak: Peatland fires have become a serious issue in peatland management. One of the factors that influence peatland fires is the decreasing groundwater level. Therefore, there is a need to monitor the groundwater level (GWL) in real time. The data collected is GWL data derived from submersible sensor, and manual readings. The GWL found in peatlands in Tangkit Baru village experiences an increase when precipitation is increasing, in contrast to peatlands in Pematang Rahim village where the GWL still decrease although there is a quite heavy rain occurred. The t-test results on the GWL sampling comparison show a value of 0.052, more than 0.05, indicating there is no difference between the two measurements method. The comparison between submersible sensor and manual measurements is similar to each other, with a difference of around 0.1-1 cm, thus brings the important of sensors maintenance in order to provide an accurate measurement. The NDWI resulted from cloud free image may provide better result, however to relate the NDWI and GWL may need some further analysis and modelling effort.
Keyword: Peatlands, NDWI, sensors, groundwater level

Judul: Identifikasi Indeks Spektral Untuk Estimasi Kadar Air Tanah Gambut (Studi Kasus: Lahan Gambut Provinsi Jambi).
Abstrak: Indonesia memiliki lahan gambut terluas di Asia Tenggara yang tersebar di Provinsi Riau, Jambi, Sumatera Selatan, Kalimantan Barat, Kalimantan Tengah, Kalimantan Selatan, dan Papua. Lahan gambut memiliki nilai kadar air yang tinggi, akan tetapi mudah untuk menjadi kering. Hal tersebut menyebabkan lahan gambut mudah terbakar terutama pada musim kemarau. Salah satu indikator kekeringan pada lahan gambut adalah kadar air tanah yang merupakan jumlah air yang tersimpan di dekat permukaan tanah yang terkandung dalam ruang antara partikel tanah. Kadar air tanah dapat diestimasi menggunakan penginderaan jauh dengan menggunakan indeks untuk mengetahui kondisi secara spasial. Penelitian ini dilakukan dengan melakukan korelasi antara kadar air tanah dengan beberapa indeks spektral menggunakan data citra satelit Landsat-8, yang bertujuan untuk mengidentifikasi indeks yang paling sesuai untuk estimasi nilai kadar air tanah di lahan gambut. Wilayah kajian pada penelitian ini yaitu stasiun Badan Restorasi Gambut yang berada di Provinsi Jambi, yang meliputi stasiun BRG2, BRG3, BRG4, BRG5, dan BRG6 yang berada di Kabupaten Muaro Jambi. Hasil menunjukkan bahwa indeks NMDI yang merupakan indeks kekeringan dengan jarak buffer 500 m dapat digunakan untuk estimasi kadar air tanah pada lahan gambut di Provinsi Jambi (R-Square > 0.5). Indeks SAVI dan MSAVI2 yang merupakan indeks vegetasi dapat digunakan untuk menggambarkan kadar air tanah rata-rata 14 harian di perkebunan kelapa sawit dengan jenis tanah gambut (R-Square > 0.5). Indeks NDVI, EVI, NDDI, NSMI, dan rasio NIR/SWIR tidak dapat digunakan untuk menggambarkan kadar air tanah di Provinsi Jambi karena hasil korelasi yang lemah (R-Square < 0.5).
Keyword: buffer, kekeringan, kelembaban tanah, Landsat 8, penginderaan jauh

Judul: Sintesis Flavon dari Fenol dan Benzoil Klorida
Abstrak: Flavone is a class of flavonoid, commonly found in plants with wide bioactivity spectrum. A widely used flavone synthesis route is through acidcatalyzed oxidative cyclization of β-diketone. In this study, unsubstituted flavone had been synthesized via 5-step from phenol, with 22% yield and successfully increased the yield of previous study on Fries rearrangement of phenyl acetate and benzoylation of o-HAP steps. Phenol was acetylated resulting 93% phenyl acetate. AlCl3-catalyzed Fries rearrangement in 1.5 hour and at 120 °C converted phenyl acetate into o-hydroxyacetophenone (o-HAP) with 40% yield. AlCl3 as catalyst produced o-HAP with higher and reproducible yield compared with BF3·Et2O and ZnCl2. Benzoylation of o-HAP followed by Baker-Venkataraman rearrangement of the ester product using KOH in dried pyridine produced β-diketone 1-(2- hydroxyphenyl)-3-phenylpropane-1,3-dione. The yield of ester and β-diketone were 71% and 85%, respectively. Finally, oxidative cyclization of β-diketone with sulphuric acid as catalyst produced 99% of flavone. The flavone product had been characterized spectroscopically and its melting point as well.
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