11,088 research outputs found

    Constant current load matches impedances of electronic components

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    Constant current load with negative resistance characteristics actively compensates for impedance variations in circuit components. Through a current-voltage balancing operation the internal impedance of the diodes is maintained at a constant value. This constant current load circuit can be used in simple telemetry systems

    Rating of electrical wires in vacuum environments

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    Electric conductors used in vacuum environments have smaller cross sections. This report provides data on the correct size wire for a required current load in free-air, low-pressure oxygen, and vacuum environments

    Water current load on arrays of rectangular plates

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    Water current interaction with arrays of plates is studied by use of the computational fluid dynamics focusing on hydrokinetic energy production applications. Various configurations of arrays of equidistant rectangular plates are considered and the current-induced pressure and velocity distribution, and the hydrodynamic forces on the individual plates are computed. First, current interaction with a singe plate in a three-dimensional current tank is studied, and results are compared with laboratory measurements for which very good agreement is observed. Next, the velocity and the pressure fields around an array of plates are determined and the forces on individual plates are computed and compared with the empirical relations. It is found that the current-induced force on the leading plate in the array is substantially different from those on the downstream plates, which experience negative forces, due to the change of the flow field. In three parametric studies, the effect of plate spacing, the number of plates and the relative water depth on the current-induced forces is investigated. It is shown that the relative size of the plates, and the number of plates in an array play significant role on the current-induced loads. Finally, the relative direction of the plates and the incoming flow is changed and its effect on the hydrodynamic forces on the plates is studied in a three-dimensional computational tank. The current loads on an oriented set of plates is shown to be remarkably different, when compared with those perpendicular to the current direction. It is concluded that the current-induced loads on an array of plates cannot be estimated by empirical relations, and specific computations, similar to those shown here, or laboratory experiments are required to investigate the current load

    Adjustable electronic current load

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    Bakalářská práce je zaměřena na návrh a realizaci elektronické proudové zátěže. Cílem práce bylo sestrojení návrhu a realizace funkčního obvodu proudové zátěže. Na základě vytvořeného obvodu v simulačním programu se obvod mohl realizovat na nepájivé pole, kde se mohla otestovat funkčnost se všemi použitými součástkami. Po otestování byl obvod sestaven na plošný spoj a následně připojen k laboratornímu zdroji, kde byla otestována jeho funkčnost.The bachelor thesis is focused on the design and implementation of electronic current loads. The aim of the thesis was to construct the design and implementation of the functional circuit of the current load. Based on the designed circuit in a simulation program, the circuit could be implemented on a non-soldering field where the functionality could be tested with all the components used. After testing, the circuit was assembled on a printed circuit board and then connected to a laboratory power supply where its functionality was tested.654 - Katedra řízení průmyslových systémůdobř

    LONG SHORT TERM MEMORY BASED TOTAL TRAFFIC PREDICTION FOR CONTAINER LOAD BALANCING

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    Predictive load balancing is becoming increasingly relevant with the rapid adoption of machine learning models. Current load balancing approaches only considers the current state of the system, even though the current state of the system often varies. Accordingly, dispatch requests are provided herein which not only consider the current load on the system, but also the future load

    Chopper-controlled discharge life cycling studies on lead-acid batteries

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    State-of-the-art 6 volt lead-acid golf car batteries were tested. A daily charge/discharge cycling to failure points under various chopper controlled pulsed dc and continuous current load conditions was undertaken. The cycle life and failure modes were investigated for depth of discharge, average current chopper frequency, and chopper duty cycle. It is shown that battery life is primarily and inversely related to depth of discharge and discharge current. Failure mode is characterized by a gradual capacity loss with consistent evidence of cell element aging

    Stochastic Analysis of Power-Aware Scheduling

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    Energy consumption in a computer system can be reduced by dynamic speed scaling, which adapts the processing speed to the current load. This paper studies the optimal way to adjust speed to balance mean response time and mean energy consumption, when jobs arrive as a Poisson process and processor sharing scheduling is used. Both bounds and asymptotics for the optimal speeds are provided. Interestingly, a simple scheme that halts when the system is idle and uses a static rate while the system is busy provides nearly the same performance as the optimal dynamic speed scaling. However, dynamic speed scaling which allocates a higher speed when more jobs are present significantly improves robustness to bursty traffic and mis-estimation of workload parameters

    Power-Aware Speed Scaling in Processor Sharing Systems

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    Energy use of computer communication systems has quickly become a vital design consideration. One effective method for reducing energy consumption is dynamic speed scaling, which adapts the processing speed to the current load. This paper studies how to optimally scale speed to balance mean response time and mean energy consumption under processor sharing scheduling. Both bounds and asymptotics for the optimal speed scaling scheme are provided. These results show that a simple scheme that halts when the system is idle and uses a static rate while the system is busy provides nearly the same performance as the optimal dynamic speed scaling. However, the results also highlight that dynamic speed scaling provides at least one key benefit - significantly improved robustness to bursty traffic and mis-estimation of workload parameters
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