Torque control of a BDC axial field drive motor with open and closed slot configuration

This paper examines the model for a brushless DC, permanent magnet disc motor suitable for light electric vehicle traction application. Subsequently a torque control scheme is proposed. Finally the model of the motor and the control are simulated in order to verify the behaviour of the drive motor with open and closed slots in the machine

Production And Study Of Bio Gazolines

Combustible ethanol was obtained from agricultural waste. Test samplesE0 (petrolgazoline) and E5, E10 and E20 (epanpl/gazoline blend) were prepared and their physical, chemical and technical characteristics were studied. The effect of bioethanol on the ecological compatibility of the automobile engine has been studied. The objects of research were Regular, Premium and Super of Petrol gasoline Samples, as well as a of 10%, 20% and 30%. bioethanol/gazoline blends. The study of the ecological properties of the test additive was carried out at the stand of automobile engines SAK-670 (Germany), on which the engine of a BMW-316 car with coupling sleeve and a transmission assembly is installed. The stand is equipped with brakes and torque sensors, as well as with crankshaft speed and fuel consumption measuring instruments. The test mixtures during an idle running of engine cause a decrease in the CO content in the exhaust gases by 10-16%, and this taking into account their low cost, indicate the prospect of expanding the use of fuel ethanol

Short-term anti-plaque effect of two chlorhexidine varnishes

Background: Chlorhexidine (CHX) varnishes have been mainly used for the prevention of caries in high-risk populations. Reports regarding their anti-plaque effect on a clinical level are limited to non-existing as opposed to their microbiological impact on plaque formation. Aim: The aim of this preliminary investigation was to evaluate the anti-plaque effect of two CHX varnishes applied on sound enamel in relation to a positive control, a negative control and to one another. Methods: Sixteen healthy subjects volunteered for this randomized-controlled, single-blind, four-treatment-four-period crossover-designed clinical trial. A 3-day plaque re-growth model was used to determine de novo plaque accumulation following CHX rinsing, Cervitec (R) application, EC40 (R) application and no therapy. The amount of plaque was measured using the Quigley and Hein plaque index and "automatic image analysis'' (AIA). Results and Conclusions: Varnish treatment resulted in significantly higher plaque levels than CHX rinsing irrespective of the varnish that was used (p <= 0.002), implying that the latter is likely to remain the gold standard as an anti-plaque agent. However, highly significant differences were also found in favour of both varnish systems when compared with no therapy (p < 0.001), which indicates that varnish treatment is an effective means of inhibiting plaque formation in a short time span. Cervitec (R) exhibited slightly, yet significantly, higher plaque levels in comparison with EC40 (R) as determined by AIA (p=0.006). Large-scale trials with a longer observation period are necessary to substantiate these results