The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In the world is about one billion of disabled people. About one third of these people are people with mobility or movements impairments. For most part of people, high precision prosthetic devices with neural control and feedback are very expensive. Almost all average price prosthetic devices have visual feedback system, which loads user vision. To solve these two problems decided develop prosthetic...
According to WHO, around a billion people with disabilities live in the world. About one third of these people are people with mobility or movements impairments. For most of these people, high-precision hand prostheses such as bebeonics or touchebonus are very expensive. Prosthetics controlled from the nervous system directly exist only as prototypes. All of the above devices provide only visual feedback...
During recent years Riga Technical University continuously modifies its teaching processes to comply with the Bologna process. Previous study plan and course's content of Riga Technical University did not always provide good interaction between courses and successful synergy of student skills, obtained from different practical and laboratory works. This paper shows how recent scientific achievements...
According to World Health Organization data about one billion of people worldwide are disabled people. About one third of these people are people with mobility or movements impairments. First problem is that for that kind of people high precision prosthetic devices with neural control and feedback are very expensive. Second problem almost all average price prosthetic devices have visual feedback system...
Accurate grid synchronization unit is essential for reliable operation of grid converters. Single-phase unit may utilize measured function and its digital derivative as the base for PLL. This paper compares some solutions of accuracy problems typical for such derivative approach: oversampling of measurements, interleaved calculation of derivative and averaged evaluation pulse signals. The proposed...
This paper deals with single-phase grid synchronization unit suitable for integration in interface converters of distributed renewable energy sources. A well known problem of the second orthogonal component for Park transformation of a phase-locked loop is successfully solved with a help of the approximate derivative function for the first time. Optimal sampling times for finding this derivative function...
Nowadays energy consumption minimization is very important. It can be done using renewable energy sources or by minimization of energy consumption. In industry case a lot of systems as CNC machines or industrial robots can regenerate energy. Regenerated energy is dissipated in breaking rheostats. To use regenerated energy usually use fast energy storage devices like flywheels or supercapacitors. In...
According to World Health Organization data about one billion of people worldwide are disabled people. About one third of these people are people with mobility or movements impairments. First problem is that for that kind people high precision prosthetic devices with neural control and feedback are very expensive. Second problem almost all average price prosthetic devices have visual feedback system...
Global energy market reveal the necessity of the use of renewable energy sources which requires an interface converter if their energy has to be passed into the grid. The operation of the interface converters depends on the operation of their synchronisation unit. Low power sources need simpler and cheaper control systems. This paper shows an example of simple implementation of the grid synchronization...
Nowadays world alternative energy sources become more popular. They have a lot advantages like low pollution level, independence of main grid although alternative energy sources have disadvantages and main of them is the unpredictability and inconsistency produced energy. This problem solving is use energy storage devices. Choice of storage devices depends on application. Sometimes flexible solution...
The paper deals with a power line interface suitable for implementation in systems composed of series connected energy storage or generation cells, for example, battery cells supercapacitors etc. The interface, which does not use any additional wiring, utilizes amplitude modulation to transmit data in one direction and impedance modulation - to transmit in the opposite. In the paper the features of...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.