An algorithm optimizing train running profile with Bellman’s Dynamic programming (DP) is investigated in this paper. Optimal train running trajectory which minimizes amount of total consumed energy has been produced under fixed origin and destination, stipulated running time, limited electric motive force and electric brake by VVVF controlled induction motor/generator blended with mechanical br...

We present conditions for the origin to be a centre for a class of cubic systems. Some of the centre conditions are determined by finding complicated invariant functions. We also investigate the coexistence of fine foci and the simultaneous bifurcation of limit cycles from them.

six patients with mitral stenosis complicated by renal artery embolism studied prospectively are presented. in five patients there was unilateral and in one patient bilateral renal artery involvement. the diagnosis was confirmed by intravenous pyelography, retrograde pyelography, renal angiography, renal scan or a combination of these. all had atrial fibrillation, proteinuria and elevated ldh l...

Iran is recognized as an endemic area for lung hydatidosis. Surgical removal of some hydatid cysts may have setious morbid consequences. To determine the characteristics of these special cysts, a retrospective survey was carried out on patients admitted to Modarres Hospital in Tehran between 1989 and 1998. We have found that ruptured, bilateral, lung located, and giant cysts (> ] 0 cm) caus...

conclusions retrograde laparoscopic appendicectomy using single polymer clip makes easy access to operating in complicated and non-complicated appendicitis. results four patients (15.4%) were converted to open surgery; three patients in group i and one in group ii. four patients developed postoperative complications; three patients in group i and one in group ii. operative time was less in grou...

This paper proposed a control method of vehicle lateral stability system. In order to obtain the best driving performance under complicated friction conditions track, direct yaw moment (DYC) and engine torque regulation (ETC) value need be adjusted avoid penalisation each other. Firstly, intervention timing is studied, which judged by phase plane longitudinal speed threshold method, respectivel...