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The aim of this paper is to identify the electrical signatures of degradations of large area organic light emitting diodes, subjected to various stress conditions. Three Philips GL55 OLEDs were stressed under three distinct temperature values; 23°C, 40°C and 60°C at a stress current density of J=15 mA/cm2 (rated current density: Jn=9.49 mA/cm2). Under thermal and electrical stresses, an increase of...
Triboelectric charging is used in many applications including electricity nanogeneration, safety or electrostatic separation of insulating materials. Insulating granules charge must be the highest in electrostatic separators so that the electric field forces allow their separation. Dielectric Barrier Discharge (DBD), used for ozone production, depollution or surface treatment, is able to change the...
Waste electric and electronic equipment (WEEE) recycling technologies often include electrostatic separation of mm-size granular plastics mixtures as a major operation. The aim of this work was to pave the way to industrial application of a new two-rotating-disks-type tribo-aero-electrostatic separator for finely-grinded matter (i.e. granule diameter < 1 mm). The experiments were carried out on...
Electrospraying has found multiple applications in various fields of engineering, science and everyday life. This paper presents study of behavior of electrosprayed dielectric liquids in high pressure environments. Experiments were carried out to evaluate use of electric fields in spatial and temporal manipulation of sprayed droplets. The focus of the study was to investigate feasibility of such control...
The main objective of this paper is to develop a novel two-stage-type electrostatic precipitator to collect finely ground lignocellulosic particles. To prevent the danger of explosion of such a powdery material, ion generation and particle charging processes are separated. Main results show that the particles can be highly charged in a two-coaxial-cylinders triode-type device, which also facilitates...
The aim of the present study is to evaluate several possibilities of preconditioning a mm-size granular mixture of waste plastics, in view of its electrostatic separation. The experimental set-up was composed of an inclined-rotating-cylinder-type tribo-charging device associated with a roll-type electrostatic separator. The experiments were performed a mixture of mm-size PP and HIPS granules provided...
The atmospheric pressure plasma graft polymerization treated fluorocarbon plastics and the metal are bonded, performing the adhesiveness evaluation. In this research, atmospheric NTP (nonthermal plasma) graft polymerization technique treats a surface of PTFE in dry process that can reduce environmental loading. The treated PTFE is adhered with the stainless steel plate, is performed peeling test....
Rapidly growing needs for large-scale industrial production of polymer nanofibers produced by electrospining require better control on electrospinning. Essential electrical aspects of electrospinning are often ignored. Observations of electrical phenomenon and adjustments of experimental variables in an electrospinning process are needed to create a feedback system for controlled electrospinning....
This paper proposes a sensorless speed control method combining sliding mode observer (SMO) and model reference adaptive system (MRAS) for the surface permanent magnet synchronous motor drives. This hybrid method can guarantee the convergence of both speed and position estimation simultaneously. In order to eliminate the torque fluctuations and mitigate the influence of harmonic components in the...
In many industrial environments properly fit and functioning respirators are required to reduce individual's exposure to particulate matter. Respirator fits are evaluated prior to use by the Occupational Health and Safety (OSHA) fit testing protocol. However, this testing cannot ensure that the seal is maintained during actual use. The OSHA fit testing equipment and laboratory grade aerosol monitors...
This paper presents an integrated-stage AC-DC LED driver based on Flyback and Class-E converter with high power factor. The Flyback circuit works in discontinuous conduction mode (DCM) to realize the power factor correction (PFC) function, and the Class-E circuit is used as DC-DC converter to transform the energy to the LED load. The integrated topology can decrease the cost of system. Moreover, the...
Organic light-emitting diodes (OLEDs) are a new technology with great potential for lighting applications. They have a large area providing a comfortable light and a good thermal dissipation. Once the OLEDs applications in lighting are recently, is necessary to create an electrical equivalent model for their analysis, because this knowledge is requested to improve the performance of the lighting systems...
Multi-output converters with single input source are currently studied as an alternative to conventional DC-DC topologies in order to improve power density in low power applications. The paper reviews three different ways in which a boost topology can be customized to supply multiple outputs. The first way uses a charge share approach using individual switches to distribute inductor energy to different...
With recent advances in technology and energy conservation efforts, strides in design and powering AC electric arc furnace (EAF) steelmaking are being achieved. In the early days of furnace operation, the furnace operators relied on analog meters for power, energy, voltage, current and limited strip chart recordings to operate the furnace. Today, with digital data acquisition systems and abundant...
Since their introduction in the early 2000s, gallium nitride transistors have emerged as a replacement for the traditional Si-based MOSFETs in power electronics applications. In dual-stage LED drivers, a solution to keep the converter simple and to regulate input and output parameters at the same time is to integrate both stages. The main drawback of this technique is the higher stress in the main...
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