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 this article are presented experimental results of a capacitor-run single phase induction motor. Representative curves for the motor were plotted directly from acquired data and by off-line computer calculus program. The method used for improving motor's efficiency is by varying according to the torque the value of the capacitor inserted in the auxiliary winding. To determine the maximum efficiency...
Bone defects of various causes - infectious, trauma, congenital - are important medical and socio-economical problems because of impossibility of spontaneous healing (very frequent), difficult treatment and long healing period. There are multiple, varied and relatively complicated ways of solving these problems. Auto grafts, allografts and bone substitutes play an important role in bone reconstructive...
In this paper the authors present the results of an implementation prototype based on previous concepts studies: a novel management mobility framework with functions for built-in verification of configuration changes and for fault tolerant algorithm. Such a mechanism is required to obtain network stability, to prevent the data loss, inadequate changes and to ensure that the moving entity stays connected...
The unsymmetrical single/two phase induction machine is often used in low-power range and low cost electric drives. The main advantages of this machine - i.e. its uncomplicated structure, machine's direct voltage supply from a single-phase network supply, the absence of the mechanical commutator thus absence of any phase- switching noise, and the machine's low-rate of wear - are counterpoised by the...
The monitoring and behavioral prediction of the hydrodams and hydrotechnical sites relies on the analysis of some objective information, the large number of sensors and examination modalities renders the human inspection of this information very difficult if not even impossible. The main objective of system is to provide a solution to overcome this problem through the development of a decision support...
The single/two phase induction motors (S/TPIM) are used in various low-power, low-cost applications. A representative example is the washing machine drum's main drive. Both manufacturers and designers have augmented their preoccupations and researches to optimize the efficiency of this drive due to the large and increasing number of devices in use and also stimulated by the market requests. At the...
The single/two phase induction motor startup is usually done by connecting the auxiliary winding of the motor to the mains; to provide the phase-shift of the auxiliary supply voltage with respect to the mains voltage, a series capacitor, also called the split capacitor is connected with the named winding. In steady state operation the auxiliary winding is switched-off or a run-capacitor is connected...
Control of a class of nonlinear/uncertain systems is discussed via a variable structure systems approach. In this paper the so-called unit vector control structure is exploited to the development of numeric design algorithm. A control law will be presented which induce and maintain sliding despite the presence of both matched and unmatched uncertainty. The natural extension to an controller design...
This paper presents the synthesis of a SCADA (supervisory control and data acquisition) system, named Pollution Guard, designed to collect and process atmospheric pollution data measured in several strategic points of a region. Pollution Guard makes use of the GPRS (general packet radio service) data communication infrastructure from a mobile communication provider that covers a very large area, practically...
This paper presents the analysis of the bridge series resonant inverter (SRI) with unidirectional switches via PSpice. The control mode of the inverter for maximum power and minimum switching losses is established and the notion of critical point is introduced. The role of the load inductance and the series inductance ratio are discussed
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.