Judul: Analysis of water balance and aridity index in catchment and irrigation area of Jatiluhur Reservoir
Abstrak: One of the functions of Jatiluhur Reservoir is to supply irrigation water for 264.000 ha of agricultural land in Pantura, West Java. Most of the farmlands in these area had water deficit during dry season. The purpose of this study were to analyze the water balance and aridity index in catchment and irrigation area of Jatiluhur reservoir, to calculate crop water requirements, irrigation water requirements and efficiency of irrigation channels on farms in the region Pantura West Java, and also to identify and mapping the areas that should receive high priority irrigation water supply. Water balance analysis using Thornthwaite- Mather method was done to obtain water resource potential representation of upstream Citarum watersheed, that hystorically had higher rainfall than its downstream. Irrigation water requirement was calculated by Penman – Monteith method of water balance analysis, using CropWat for Windows version 8.0 software. The result of rainfall analysis showed that dry season in Pantura was occured from April until November (eight months), and wet season was occured from December until March (four months). The result of water balance analysis showed that soils in this region experienced water deficit during April to December. Analysis of aridity index showed that the coastal region Pantura experienced severe drought from June to October, with August as the peak. Water balance of Citarum river and Jatiluhur reservoir indicated that irrigation water demand for agricultural land in Pantura could not fulfilled only by Citarum River, so it need subvention from local resource. Moreover, calculation using CropWat for Windows showed that water requirement for all agricultural land in Pantura was 3.797,7 million m3/year, while data from PJT II showed that the average of irrigation water supply for this area was 5.519,6 million m3/year. It indicated that efficiency of the irrigation Jatiluhur channels was about 68,8%.
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Judul: Analisis Kebutuhan Air dan Kelebihan Air Hasil Konsolidasi di Balai Besar Penelitian Tanaman Padi Sukamandi.
Abstrak: Water balance is the balance of the input and output of water somewhere at a certain period, so it can be to determine the amount of the excess or shortage of water. This study aimed to analyze the flow of water and the excess water needs that occur at BBPTP. The procedure consisted of field studies, literature review and data analysis. Based on the analysis, the direction of water flow in the area around the research flowing to the south where there is a Cijengkol river downstream water flow. Based on the analysis of the water needs of the consolidation that has been done can be concluded highest evapotranspiration values occurred in October that is 7.13 mm/day. The highest value of water demand in October is 2.10 lt/sec/ha. The maximum irrigation discharge occurs in the irrigation channel number 7 is 28.01 lt/sec with 13.34 ha area. Based on the analysis of rainfall can be summed value maximum daily rainfall for the area of research at the Center for Rice Research amounted to 76.25 mm with a return period of 2 years and Gumbel distribution. The maximum effluent discharge occurs in the drainage channel number 88 is 117.30 lt / sec with 14.15 ha area.
Keyword: discharge of irigation, effluent discharge, evapotranspiration, rainfall

Judul: Grup dan Homomorfisma Grup pada Rubik Revenge
Abstrak: Rubik cube is a kind of puzzle game. A player must arrange rubik sides, which have been disordered, back to the position where every side has the same colour. This paper does not focus on the settlement solution, but instead on proving the existence of a group homomorphism between rubik movement group and S96 symmetric permutation group in rubik revenge. Firstly, it has been proved that rubik movement set is a group. Then, it also has been proved that the M set, which contains numeric labels of 1 until 96 in cubinos sides, is S96 symmetric permutation group.
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