Judul: Optimasi biaya antisipasi bencana alam
Abstrak: Upaya antisipasi dalam menghadapi suatu bencana alam sangat penting dilakukan untuk meminimalkan dampak yang ditimbulkan apabila bencana alam terjadi. Dalam kaitan ini, salah satu usaha yang harus dilakukan adalah perencanaan sistem logistik bagi pemenuhan kebutuhan bahan pokok dan obat- obatan yang dibutuhkan jika terjadi bencana. Salah satu hal yang harus dilakukan adalah menentukan lokasi pembangunan depot yang optimal untuk menyimpan logistik serta rute dan frekuensi pengiriman ke daerah bencana dengan biaya minimal. Permasalahan ini dapat dimodelkan sebagai suatu pemrograman linear bilangan bulat. Model ini diimplementasikan untuk kasus di Provinsi Jawa Barat. Dengan model ini dihasilkan lokasi depot-depot optimal serta rute dan frekuensi pengiriman bahan pokok glan obat-obatan dari depot ke lokasi terjadinya bencana….
Keyword: Anticipation, Integer linear programming, Natural disaster, Optimization

Judul: Model optimasi pendistribusian logistik bencana alam
Abstrak: Logistics distribution in emergency situations involves dispatching commodities (medical materials, specialized rescue equipment and rescue teams, food, etc.) to the affected areas. The optimization process is done by combining the optimal logistics distribution with vehicles scheduling, such that quantity and capacity loads of every vehicle is satisfied. At the end of logistics distribution process it is possible that there is unsatisfied demand in affected area. The minimization of unsatisfied demand can be regarded as an integer linear programming problem (ILP). The problem can be solved using branch and bound method. Optimal value is obtained using Lingo 8.0 Unlimited software.
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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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