in this research, the structural behavior of timber and concrete sleepers in a standard railway turnout is evaluated, in the case of raising speed. in approaching this evaluation, current practices in the structural analysis of sleepers are surveyed and then, the sensitivity analysis with abaqus software is made based on selected criteria (bending and shear stresses as well as contact pressure)...

Congenital fistulae between the tracheobronchial tree and oesophagus usually originate from the lower end of the trachea or right main bronchus. The case history is presented of a man in whom a fistula between the oesophagus and left main bronchus was not diagnosed until the age of 48.

This paper summarizes recently developed soft-switching inverters and proposes two alternative options for electric propulsion drives. The newly developed soft-switching inverter employs an auxiliary switch and a resonant inductor per phase to produce a zero voltage across the main switch so that the main switch can turn on at the zero-voltage condition. Both the auxiliary switch and the resona...

The front-end transmit/receive switch circuit is one of the essential elements in modern wireless handsets. The main function of the transmit/receive switch is switch the antenna either to the transmitter or the receiver. It must have high isolation in order to avoid the RF-power of the transmitter (PA) turning on the receiver (LNA), resulting in high loss or in the worst case damage. Low inser...

the periodic trimming of the long hairs growing at the distal end of the tail -switch trimming- is humane alternative of tail docking. the purpose of this study was to determine the influence of switch trimming on somatic cell count (scc), california mastitis test (cmt) and udder cleanliness of lactating cows in a free-stall dairy farm. in the present study, 219 healthy, pregnant holstein cows ...

* This project is funded under the NASA-KSC STTR-Phase I Program. ABSTRACT A single-stage power factor correction converter with softswitching is proposed in this paper. The topology of this converter is derived by adding a resonant circuit to an existing Single-Stage, Single-Switch Power Factor Correction (S PFC) converter. As a result, zero-voltage-switching and zero-current-switching are ach...