Judul: Flood Susceptibility Area Mapping in East Belitung  Regency based on Geographic Information System
Abstrak: Banjir merupakan salah satu permasalahan di Kabupaten Belitung Timur, namun belum dipetakan kerawanan banjir untuk wilayah kabupaten. Peta rawan banjir termasuk langkah untuk mengurangi dampak bencana banjir yang dapat diidentifikasi dengan cepat menggunakan sistem informasi geografis dan pengindraan jauh. Tujuan penelitian ini adalah membuat peta daerah rawan banjir di Kabupaten Belitung Timur dan memvalidasinya. Identifikasi daerah rawan banjir dilakukan dengan metode skoring dan pembobotan. Validasi dilakukan terhadap gambar dampak lokasi dan data pengindraan jauh Sentinel-1. Parameter yang mempengaruhi kerawanan banjir di Kabupaten Belitung Timur adalah curah hujan, kemiringan lereng, ketinggian lahan, tutupan lahan, jenis tanah, dan buffer sungai. Hasil penelitian menyatakan Kabupaten Belitung Timur memiliki tingkat kerawanan banjir sedang yang terluas. Tingkat kerawanan rendah dan sedang terluas terdapat di Kecamatan Kelapa Kampit, sedangkan tingkat kerawanan banjir tinggi dan sangat tinggi terluas terdapat di Kecamatan Gantung. Sebanyak 12 titik dari 18 titik kejadian banjir terletak di wilayah kerawanan tinggi. Genangan banjir menurut citra Sentinel-1 teramati di lima kecamatan dengan luas terbesar di kerawanan banjir tinggi sebesar 28,97 km2., Flood is one of problems in East Belitung Regency, but the flood susceptibility has not been mapped for the region. A Flood susceptibility map helps reduce the impact of flood disasters. The map can be quickly generated using geographic information systems and remote sensing. This research aims to create a flood susceptibility map in East Belitung Regency and validate it. Flood-susceptible areas are identified using a weighted scoring method. Validation is based on impact images of flooding and remote sensing data. Parameters affecting flood susceptibility in East Belitung Regency include rainfall intensity, land slope, land elevation, land cover, soil type, and buffer distance from a river. The results indicate that East Belitung Regency has the largest area of moderate flood susceptibility. Low and moderate susceptibility has the greatest area in Kelapa Kampit District, while high and very high susceptibility has the greatest coverage in Gantung District. Twelve of eighteen identified flood points are in high susceptibility areas. According to Sentinel-1 imagery, flooding is observed in five districts, covering an area of about 28.97 km2, primarily within high susceptibility areas.
Keyword: flood susceptibility, flood susceptibility map, Sentinel-1, validation

Judul: Pemetaan Daerah Rawan Banjir Berbasis Sistem Informasi Geografis pada Kecamatan Ciputat Timur Kota Tangerang
Abstrak: Banjir merupakan salah satu permasalahan utama di Indonesia. Salah satu upaya untuk meminimalkan dampak negatif banjir adalah dengan menyediakan peta daerah rawan banjir. Penelitian ini bertujuan untuk menganalisis pengaruh beberapa parameter kerawanan banjir terhadap peluang kejadian banjir, memetakan daerah rawan banjir, dan mengidentifikasi daerah risiko banjir di Kecamatan Ciputat Timur. Metode yang digunakan dalam analisis kerawanan banjir adalah metode skoring dan pembobotan dengan bantuan sistem informasi geografis (SIG). Parameter kerawanan banjir yang digunakan yaitu curah hujan, kemiringan lereng, ketinggian lahan, penggunaan lahan, jenis tanah, dan buffer sungai. Hasil penelitian menunjukkan wilayah Kecamatan Ciputat Timur didominasi kelas kerawanan banjir kategori sedang seluas 1.047,33 ha (66,22%). Kelas kerawanan banjir kategori tinggi dan sangat tinggi terdapat di Kelurahan Cireundeu dengan luas secara berturut-turut 20,95 ha dan 2,93 ha. Tingkat risiko banjir di Kecamatan Ciputat Timur sebagian besar masuk kategori sedang seluas 903,89 ha (57,15%). Kelas risiko banjir kategori tinggi terluas yaitu Kelurahan Cireundeu dengan luas 13,02 ha., Flooding is one of the main problems in Indonesia. One of the efforts to minimize the negative impact of flooding is to provide a map of flood-prone areas. This research aims to analyze the effect of several flood vulnerability parameters on the chance of flood occurrence, map flood-prone areas, and identify flood risk areas in Ciputat Timur Sub-district. The method used in flood vulnerability analysis is scoring and weighting method with the help of geographic information system (GIS). The flood vulnerability parameters used are rainfall, slope, land elevation, land use, soil type, and river buffer. The results show that the Ciputat Timur Sub-district area is dominated by the medium category flood vulnerability class covering an area of 1.047,33 ha (66,22%). The high and very high flood vulnerability classes are found in Cireundeu Village with an area of 20,95 ha and 2,93 ha, respectively. The level of flood risk in Ciputat Timur Sub-district is mostly in the medium category with an area of 903,89 ha (57,15%). The largest flood risk class in the high category is Cireundeu Urban Village with an area of 13,02 ha.
Keyword: kerawanan, Pemetaan, risiko, flood, mapping, risk, banjir, sig, gis, vulnerability

Judul: Characterizations of low alloy steel sae 4422  plated with chromic acid (Cro3)
Abstrak: Characterizations of low alloy steel SAE 4422 plated with chromic acid (CrOrO3) was use Optical Microscopy (OM), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), RD),Energy Dispersive Analysis of X-Ray (EDAX), Hardness Test and Roughness Test. Microstructures analysis exhibits cracks and grain boundaries microcracks as a characteristics of chrome metal found at plating metal. Perlite and Ferrite as grains of steel found at base metal with grain boundaries around it. Phase analysis of plating metal appropriate to chrome metal with lattice constant (a) is 2.559 Å and phase analysis of base metal appropriate to iron ferrite with lattice constant (a) is 3.318 Å. Both plating and base metal have cubic system. Chemical analysis of plating metal at surface section exhibits that cracks area have highest value of carbon element compare with grains and grains boundaries area. While chemical analysis of base metal at cross section exhibits that perlite have highest value of carbon element compare with ferrite and grain boundaries. The hardness value of plating metal at surface section and cross section are 753 and 637 VHN. While, the hardness value of base metal and interface area at cross section are 205 and 373 VHN. The roughness value at measurement points of chrome surface for as received sample are 0.445 μm. Observation used Optical Microscopy and Scanning Electron Microscopy exhibits surface irregularities combine to form surface texture of plating metal at surface section.
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