Judul: Pemetaan Shelter dan Jalur Evakuasi Tsunami Studi Kasus: Kabupaten Bantul.
Abstrak: Terdapat potensi tsunami setinggi 20 meter yang dapat terjadi di sepanjang pesisir selatan Pulau Jawa. Bantul merupakan salah satu daerah yang rentan akan bencana tsunami tersebut sehingga diperlukan upaya mitigasi dalam bentuk dan pembuatan jalur evakuasi serta lokasi yang tepat dijadikan tempat evakuasi (shelter). Metode yang digunakan dengan bantuan aplikasi Sistem Informasi Geografis antara lain pemodelan inundasi tsunami, weighted overlay, dan network analysist dengan bantuan tools InaSafe. Hasil pemodelan inundasi tsunami menunjukkan tsunami ketinggian 10 meter menggenangi area seluas 9,72 km2, ketinggian 15 meter menggenangi area seluas 15,69 km2, dan ketinggian 20 meter menggenangi area seluas 21,29 km2. Kecamatan Kretek, Sanden, dan Srandakan terdampak oleh hasil pemodelan tsunami tesebut.. Terdapat 8940 penduduk terdampak tsunami run up 10 meter, 15060 penduduk untuk run up tsunami 15 meter, dan 23870 penduduk untuk run up tsunami 20 meter sebesar 23870 penduduk. Hasil pemodelan menunjukkan 41 rute evakuasi tsunami dengan 16 jalur yang dikategorikan sangat jauh, 3 jalur dikategorikan jauh, 14 jalur yang dikategorikan sedang, dan 5 jalur yang dikategorikan dekat, dan 3 jalur yang dikategorikan sangat dekat., There is a potential for a tsunami as high as 20 meters that could occur along the southern coast of Java Island. Bantul is one of the areas that is vulnerable to the tsunami disaster, so mitigation efforts are needed in the form and creation of evacuation routes and appropriate locations for evacuation (shelter). The methods used with the help of the Geographic Information System application include tsunami inundation modeling, weighted overlay, and network analysis with the help of InaSafe tools. The results of the tsunami inundation model show that a tsunami with a height of 10 meters inundated an area of 9.72 km2, a height of 15 meters inundated an area of 15.69 km2, and a height of 20 meters inundated an area of 21.29 km2. Kretek, Sanden and Srandakan sub-districts were affected by the results of the tsunami modeling. There were 8940 people affected by the 10-meter tsunami run-up, 15060 people for the 15-meter tsunami run-up, and 23870 people for the 20-meter tsunami run-up of 23870 people. The modeling results show 41 tsunami evacuation routes with 16 lanes categorized as very far, 3 routes categorized as far, 14 routes categorized as medium, 5 routes categorized as close, and 3 routes categorized as very close.
Keyword: inundation, network analysist, overlay, tsunami

Judul: Analysis of Tsunami's Vulnerability Level and Mitigation Study Case: Tasikmalaya Regency's Coast
Abstrak: Kondisi geografis dan geologis menjadikan Indonesia rawan terhadap bencana tsunami. Salah satu wilayah pesisir yang memiliki potensi terjadinya tsunami adalah Pesisir Kabupaten Tasikmalaya. Berdasarkan hal tersebut, diperlukan adanya analisis tingkat kerawanan dan upaya mitigasi tsunami dengan tujuan memperkirakan luas wilayah yang terdampak tsunami, menganalisis tingkat kerawanan tsunami, memperkirakan jumlah penduduk yang terdampak, memetakan shelter dan jalur evakuasi tsunami, serta merencanakan upaya mitigasi struktural tsunami. Metode yang digunakan, tool model builder, weighted overlay, InaSAFE, dan Network Analyst. Hasil pemodelan menunjukkan tsunami setinggi 10, 15, dan 20 meter dapat menggenangi wilayah seluas 12,25 km2, 18,47 km2, dan 24,69 km2. Wilayah Pesisir Kabupaten Tasikmalaya didominasi oleh tingkat kerawanan rendah sebesar (54,62%), kemudian tingkat kerawanan sangat rendah (26,25%), tingkat kerawanan sedang (12,61%), tingkat kerawanan tinggi (5,30%), dan tingkat kerawanan sangat tinggi (1,22%). Jumlah penduduk terdampak tsunami setinggi 10, 15, dan 20 meter adalah sebanyak 8.280, 12.320, dan 17.770 orang. Terdapat 59 jalur evakuasi, dimana jalur yang termasuk kategori sedang sebanyak 27 jalur, kategori dekat 14 jalur, kategori sangat dekat dan jauh masing-masing sebanyak 9 jalur. Upaya mitigasi struktural yang dilakukan adalah dengan membuat green belt dan sea wall yang efektif mereduksi tsunami dengan tinggi di bawah 15 meter., Geographical and geological conditions make Indonesia vulnerable to tsunami disasters. One of the coastal areas that has the potential for a tsunami is Tasikmalaya Regency’s Coast. It is necessary to analyze tsunami’s vulnerability and mitigation to describing the area affected by the tsunami, analyzing the level of tsunami vulnerability, estimating the number of people affected, mapping shelters and tsunami exit routes, and planning structural tsunami mitigation. Methods used, model builder, weighted overlay, InaSAFE, and Network Analyst. The results show that tsunami as high as 10, 15 and 20 meters can inundate areas of 12,25 km2, 18,47 km2 and 24,69 km2. Tasikmalaya Regency’s Coast is dominated by a low level of vulnerability (54,62%), then a very low level of vulnerability (26,25%), a medium level of vulnerability (12,61%), a high level of vulnerability (5,30%), and a very high level of vulnerability (1,22%). The number of people affected by tsunamis as high as 10, 15 and 20 meters was 8.280, 12.320 and 17.770 people. There are 59 exit routes, which there are 27 routes in the medium category, 14 routes in the near category, and 9 routes in the very near and far categories. The structural mitigation efforts carried out are by creating a green belt and sea wall which are effective in reducing tsunamis with a height of below 15 meters.
Keyword: kerawanan, mitigasi, tsunami, inundasi

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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