in this paper, a reliable approach is introduced to approximate periodic solutions of a system of coupled integrable dispersionless. the system is firstly, transformed into an ordinary differential equation by wave transformation. the solution of ode is obtained by the homotopy perturbation method. to show the periodic behavior of the solution, a modification based on the laplace transforms and...

In this paper, a reliable approach is introduced to approximate periodic solutions of a system of coupled integrable dispersionless. The system is firstly, transformed into an ordinary differential equation by wave transformation. The solution of ODE is obtained by the homotopy perturbation method. To show the periodic behavior of the solution, a modification based on the Laplace transforms and...

2017 and 2020 will represent major milestones for the light vehicle Diesel engine in Europe and other regions that are committed to WLTP. The Diesel engines’ position as the most efficient prime mover and the need for it to be included in a balanced and aggressive CO2 roadmap is not really disputed. Diesel however faces significant challenges in WLTC / RDE to deliver low ‘real world’ engine out...

In this article, in order to optimize diesel aftertreatment system with periodically reciprocating flow (PRF), an experimental study is conducted investigate its characteristics such as pollution emissions, regeneration of particulate filter (DPF), concentration, and size distribution matter (PM) escaped well temperature under unidirectional PRF operating conditions. The effects cycle exhaust g...

operated oil successfully under somewhat difficult circumstances. The patient was brought to the dispensary at night, and the only available light were two dim hospital lanterns. The tumor was as large as a child's head. There was fluctuation at its lower part, which for a time obscured the diagnosis, owing it was afterwards found to effused fluid ; the strangulation was 12 hours old; the sympt...

To meet more and stringent emission standards, the combined technologies must be used to purify pollutants of vehicle exhaust. Among them, aftertreatment devices, including DOC, SCR, DPF, so on, are most efficient methods. However, after long-term running, performance devices will inevitably degrade. There several mechanisms that can explain aging phenomena. For catalytic such as DOC thermal po...