Judul: Analisis Potensi Air Sungai pada Embung 190 di PG. Bungamayang PTPN VII, Lampung
Abstrak: Water is a very important element for sustainability of daily needs. Water also used as field irrigation. This research was serves to analyze the potential of river water in PG. Bungamayang PTPN VII, Lampung. This research conducted at 190th small dam in Sugar Factory of Bungamayang which is part of Tulang Bawang watershed and geographically located at 104° 52' 07" SL and 04° 35' 24" EL. In this research, the SWAT analyze performed using ArcSWAT 2012 as a plug-in for ArcGIS 10. In these simulations, performed of 4 process, including the process of watershed delineation, establishment of hydrological response units (HRU), data processing and SWAT simulation, and visualization process. For validation process, observation discharge and simulation discharge of SWAT used for comparison from March 20th until April 5th 2014. Based on SWAT simulation, shown 0.066 m3/s average discharge and for observation discharge, shown 0.043 m3/s average discharge with 0.897 coeffesien correlation. The potential water shown by the annual average discharge which has been simulated by SWAT. The maximum average annual discharge is 0.143 m3/s on April and minimum average annual discharge is 0.018 m3/s on September. With the result, potential water river on 190th small dam in PG. Bungamayang PTPN VII, Lampung is 2 373 950.55 m3 every years.
Keyword: SWAT., potential water, HRU, Tulang Bawang watershed

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: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
Keyword: