Judul: Optimasi Distribusi Air Bersih di Asrama TPB IPB
Abstrak: One of the main issues of water distribution process relates to effectiveness of pumps operation. When a pump was turn on there will be a power surge that makes it requires higher power, such that initial power is much greater than normal power. In this manuscript, optimal use of pump for the water distribution at TPB IPB dormitory is discussed. That problem was modeled into an integer linear programming and solved by using LINGO 11.0 software. The model is solved to obtain the pump operation scheduling which minimize energy consumption of electricity.
Keyword: Bogor Agricultural University (IPB), water distribution, pump scheduling, optimization

Judul: IPB (Bogor Agricultural University)
Abstrak: The focus of this study is the devetopment of a sustainable water resource utilization model through proper water priCing regime in the DKI Jakarta region, in accordance With cost of treatment at the firm (pAM Jaya) and conservation of water resources at the up-stream catchment areas. The objectives of this study are: (1) to buill and test the behavior of water supply and demand over time, (2) to conduct the optimizatiOn model the time variable, and (3) to formulate alternative of scenarios water resource management policy v.flich will give an optimum benefit and win con5efVe the water resource. Two methods are used in this research: First, the econometric analysis was applied to construct the water suppty and demand dynamicalfy. Second, the dynamic optimization was carried out to analysis the total benefi1s accrued to stakehokiers given the constraints on water supply and water pricing mechanism. Results of the study show that demand for water in urban area is greater than its supply and water supply has experienced a decreasing retum to scale. The water price is specified by ftat price which does not capture the nature of water scardty, because it is not related to economic consideration, especially, related to adjustment between investment. operation, and maintenance cost.. to contrast, marginal price has shown the scarcity of water resource and by intemaIizing the cost of externality in .the up-stream and water fee in the fonn of provision value of water (NPA). Another resuH suggests that the benefit of an optimum utilization of ground and surface water resource at baseline modeJ. reached about Rp. 141.128 billion for the last period, with demand growth at 4.7 percent The gromdwater stock. Of aquifefS inDKI Jakarta witl decrease by half in 2008, afterwards the treatment of surface water will become Vert intensive, and very costly, so that the price of potable water witl be expensjve, Finally. the study shows that the market based scenarios generates more benefit and a longer time path of planning to meet the growth of demand and the available stock d water resources will be decreased in 2039.
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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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