Judul: Utilization of Geographic Information System for Mapping Flood  Prone Areas in Hulu Sungai Utara Regency, South Kalimantan
Abstrak: Bencana banjir dapat terjadi karena dipengaruhi oleh faktor alam dan faktor nonalam. Kabupaten Hulu Sungai Utara termasuk wilayah dengan potensi banjir yang cukup tinggi karena berada di dataran rendah. Tujuan penelitian ini adalah memetakan daerah rawan banjir dan mengidentifikasi daerah rawan serta risiko banjir di Kabupaten Hulu Sungai Utara. 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 Kabupaten Hulu Sungai Utara didominasi kelas kerawanan banjir kategori rendah seluas 41.310,67 ha (46,28%). Kelas kerawanan kategori tinggi dan sangat tinggi banyak terdapat di Kecamatan Babirik seluas 4.238,00 ha dan Kecamatan Paminggir seluas 651,34 ha. Tingkat risiko banjir di Kabupaten Hulu Sungai Utara sebagian besar masuk kategori sangat rendah seluas 53.363,24 ha (59,78%) yang didominasi Kecamatan Danau Panggang, Kecamatan Amuntai Selatan dan Kecamatan Paminggir., Flood disasters can occur because they are influenced by natural and nonnatural factors. Hulu Sungai Utara Regency is an area with a fairly high potential for flooding because it is located in the lowlands. The purpose of this study were to map flood-prone areas and identify flood-prone areas and risks in Hulu Sungai Utara Regency. The method used in the analysis of flood vulnerability is the method of scoring and weighting with the help of a geographic information system (GIS). The flood susceptibility parameters used are rainfall, slope, land height, land use, soil type and river buffer. The results showed that the area of North Hulu Sungai Regency was dominated by the low category of flood susceptibility class with an area of 41.310,67 ha (46,28%). The high and very high vulnerability classes are mostly found in Babirik District covering an area of 4.238,00 ha and Paminggir District covering an area of 651,34 ha. The flood risk level in Hulu Sungai Utara Regency is mostly in the very low category, covering an area of 53.363,24 ha (59,78%) which is dominated by Danau Panggang District, South Amuntai District and Paminggir District.
Keyword: flood, mapping, prone, risk

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: 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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