At velocities below 100 km/h and during stops the Transrapid vehicle has to be supplied with energy by an external source for the on board power consumers like levitation magnets and climate control. A new contactless inductive power supply system, IPS, was developed for the German Transrapid project in Munich on behalf of the BMVBS. With IPS the power supply will work without mechanical contac...

Today, one existing class of RFID systems are based on ISO 14443 (Proximity Coupling). This is the standard for RF-interfaces of contactless smart card systems. Contactless RF interfaces of smart cards are very often regarded as less secure than contact based smart cards. This tenor may be changed based on our new approach. Therefore we suggest to establish secure password authenticated wireles...

Due to the increasing use of electronic systems in all fields of everyday life, users are now having to deal with electronic identification and authentication practically every day. Password based authentication systems are neither secure nor particularly convenient for users. Here, we are presenting the idea of using an NFC-enabled mobile phone as a chip card reader for contactless smart cards...

In recent years more and more security sensitive applications use passive smart devices such as contactless smart cards and RFID tags. Cost constraints imply a small hardware footprint of all components of a smart device. One particular problem of all passive smart devices such as RFID tags and contactless smart cards are the harsh power constraints. On the other hand, active smart devices have...

Advances in wireless power transfer technology provide the possibility to construct electrified roads and charge electric vehicles driving on road. Dynamic charging mode enables contactless interaction of with grid has a promising prospect, but it may also bring about potential challenges such as reliability deterioration. Electric buses serve forerunner use this new due their fixed patterns. T...

This paper investigates the dynamic behavior of Gas Metal Arc Welding (GMAW) process for two types of power supplies –inverter and rectifier- for short circuit transfer mode. The large ripples on the rectifier power source are able to perturb the metal transfer mode. In this experimental work some operating points in the short circuit mode have been selected using an automatic pipeline welding ...