volume 51

Thermophysical simulation of thermoelectric cooling system

The main active element in thermoelectric cooling systems is Peltier module. Its action is based on the Peltier effect, which results in the conversion of electrical power into a temperature gradient. This article presents a simulation ...  read more

Impulse control of a DC motor with active driver circuit

This paper describes a study and the results obtained from the implementation of pulse control over a DC motor by means of both a conventional and an active driver for controlling the powerful MOSFET. The studied active driver gives ...  read more

Radiocommunication systems for the developing countries – the Bulgarian contribution

In the last several months, the world and the global media attention were focused exclusively toward the refugees, going from near east to the developed Central European countries. It was explained, that most of them are economical, ...  read more

Hall sensors action with new interpretation

A novel manifestation of the Hall effect in conducting materials, semiconductors included, in the temperature range 77 K – 300 K has been experimentally observed. The nature of this phenomenon is the appearance of magnetically controlled ...  read more

Ethernet based street lighting control system

Presented an alternative design provides centralized management of street lighting through wired communication between modules. This communication is based on a widespread and generally available in each locality Ethernet network. Practical ...  read more

Specific occurrences in DC/DC converters used in flyback mode

The flyback commutation mode is usually chosen when capacitor has to be charged to certain high voltage. The power source supplies portions of energy into the field of air gap transformer that are further transferred to the capacitor. ...  read more

State of the art of structures and main components of hybrid and electric vehicles

The main objective in this paper is to review the most widely used structural schemes of hybrid and electric vehicles and their basics blocks. The various sources of energy are consistently presented – fuel cells, batteries and ...  read more

One versatile MeV-ion beamline for multiple applications

A versatile ion beam line based on a 1.7-MV Tandetron tandem accelerator has been established at Chiang Mai University, Thailand in a compact manner for multiple-purpose ion beam applications including analysis, microbeam and implantation. ...  read more

Simulation of ion implantation for Si using TCAD

To realize further high performance in semiconductor devices, the development of efficient processes and a reduction in the number of trial productions are indispensable. Therefore, the orientation of development plans and a reduction ...  read more

Spore-forming bacteria sterilization using plasma-based ion implantation (2nd report)

A main purpose of sterilization is to kill the harmful microorganisms. The spore-forming bacteria which are present in foods frequently cause food spoilage. Although the vegetative cells of those bacteria are sterilized easily, the ...  read more