A study on results of TPS according to the optimum traction power supply system of Urban MAGLEV railway No . 66
The main purpose of this study is to conduct correlation factor analysis in both headway time and power capacity by means of analytical approach to results of power property in terms of headway time of Urban MAGLEV from the standpoint of headway time of Urban MAGLEV on the Incheon international airport maglev railway, in the process of construction at the moment, in Korea. Railroad track, as a fundamental condition of service simulation, is set up with double track, and it is therefore that the three patterns of headway time of Urban MAGLEV on the track. TPS is performed by Urban MAGLEV operation consisted of three separated patterns in headway time on the double railroad track or the trial track. As a result of such simulation, three types of characteristics listed below were obtained. 1) The peak power capacity related to transportation demand on the trial track compared to the result given. 2) The optimum capacity of substation is determined based on the analysis. 3) The location of substations is determined based on the analysis. The result of research performance, therefore, enables us to reflect the power supply system design for the stabilized and economized Urban MAGLEV operation
Iterative techniques for the solution of complex DC-rail-traction systems including regenerative braking
The solution of simultaneous algebraic equations describing a DC-traction power system is based on an iterative technique because of their nonlinearity. Two iterative methods specified for DC-load-flow problems are described and their mathematical and geometrical explanations are presented. The methods have been tested for DC-fed traction power systems and comparisons made of the computational time and iteration count. The DC-traction software which has been developed enables the situation with trains operating in regenerative-braking mode to be simulated. A condition in which convergence problems are to be expected occurs when there is a surplus of power produced during regenerative braking. In this case two different modelling approaches to represent regenerative trains in the simulation are investigated. A representative DC-fed-traction power system with train regenerative braking was simulated and the preferred method is selected by analysing the simulation results obtained and the computation times expended.
5.63 and 5.80 MeV levels of Ne20; de-excitation branching
Abstract The ratio Г γ /Г for the 5.63 and 5.80 MeV levels of Ne 20 has been determined to be 0.077 (±0.008) and −4 , respectively, by using the C 12 (C 12 , α)Ne 20 reaction and determining the fraction of the events in which the alpha-particle and the Ne 20 recoil are present in coincidence at the kinematically correct angles. In both cases these results in themselves are shown to imply radiative E1 transition (5.63→1.63 and 5.80→0, respectively) probabilities ⪡5 × 10 −5 Weisskopf units. When taken together with the life-time for the 5.63 MeV level measured by Evans et al . values of Г( E1 ) ≲ 5 × 10 −6 and Г α ≈ 6% of the particle estimate are obtained for this state.