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A novel method is proposed for non-contact measurement of electrostatic charge on a surface using focused impulse ultrasound to excite movement of a charged object. The focused impulse ultrasound is generated by turning the 40 kHz ultrasound signal on/off and a phased-array method using airborne ultrasound transducers. The impulse excitation of the electrostatic charge induces impulse electric field...
We propose a new display system technology that can hide secret information behind a displayed image, while simultaneously satisfying both high invisibility and readability requirements. The hidden information is a kind of binary image including characters, and various kinds of patterns, i.e., quadratic residue (QR) codes. This technique uses a temporally bright modulated invisible pattern in a moving...
A diesel engine is one of the most fuel efficient engines and expected to save energy even it is necessary to remove particulate matter (PM) contained in the exhaust gas. Diesel particulate filter (DPF) has been established as a key technology in reducing diesel PM, however, technological improvements are still required to reduce pressure drop and to assure the regeneration. Therefore, we focused...
In recent years LED lighting has been exponentially growing. In daily life the demand for dimmable LED brightness has also increased. This requires that the conventional TRAIC dimmer is compatible with LED driver. This paper presents a low profile LED offline phase-cut dimming ballast, using the serial inductor half bridge (SIHB) converter with piezoelectric transformer (PT), which delivers at output...
Nowadays energy and water are some of the most important issues facing mining industry. Many mines are located in desert areas and they need to pump water from isolated wells or from the ocean. To satisfy the water demand many high power water pump stations are required. The operation of these systems is expensive due to the high-energy cost. This paper presents a case of study of a solar system to...
The paper exposes the topic of LED lamps photometric flicker. Aim of the paper is to evaluate the flicker of contemporary devices. A sample of commercially available LED retrofit lamps is analysed in terms of the photometric flicker under ideal sinusoidal power supply conditions. Therefore the flicker described here is not a power quality issue, but a characteristic of the analysed lamps. The flicker...
To solve the problem of fault location in 20 kV medium-voltage distribution network cable line, a method based on sheath grounding current is presented in this paper. When unsymmetrical earth fault occurs, the sheath grounding current contains three ingredients. After analyzing the relationship between induced circulating current flowing in cable sheath and zero-sequence current flowing in the cable...
This paper proposes a wide area protection scheme for smart distribution network with distributed generation (DG). After the division of distribution network, the splitting equipments (SEs) and advanced feeder terminal units (AFTUs) are installed at the borders of the zones which contain DGs and the AFTUs are installed at the borders of the zones which contain no DGs. AFTU detects the local realtime...
Power distribution equipment is the backbone of any Industrial process infrastructure. Safety and reliability are the two most important criteria in the proper functioning of the power distribution system. Low voltage switchgear is an important part of power distribution. Minimizing arcing faults in the switchgear is of utmost importance to enable a safe environment. Arcing faults increase the temperatures...
The ability of polymers to acquire and retain electrostatic charges is valued in designing new equipment like electrostatic separators, electret filters and powder coating devices. Several recent studies have pointed out the beneficial effect of electric charges on the lubricated contacts. The aim of this paper is to compare two physical mechanisms of electric charging of polymers: triboelectric effect...
We can successfully solve the severe problem in DFD (Depth-fused 3D) display that the maximum depth between front and rear planes is limited because depth fusing from front and rear images to one 3D image becomes impossible. We also propose a perception model for this DFD display. When the distance is large, perceived depth is separated to near front plane, near rear plane and mid-point region. This...
This paper describes our recent progress in the development of oxide thin-film transistors (TFTs) for use in flexible organic light-emitting diode (OLED) displays. The bending stability of oxide TFTs was investigated using In-Ga-Zn-O (IGZO) TFTs fabricated on a thin polyimide film. Back-channel-etched (BCE) TFTs on a plastic film using In-Sn-Zn-O (ITZO), which has higher mobility than IGZO, were also...
A single-stage single-switch LED driver is proposed in this paper. The topology of the converter is formed by integrating buck-boost and Class E circuit by sharing one switch device, which can greatly reduce the cost and improve the reliability of the system. To realize the power factor correction (PFC) function, the buck-boost circuit works in discontinuous conduction mode (DCM). Since the soft switching...
The recycling of plastic materials is considered nowadays as a major strategic issue, since several million tons of plastic are the subject of recovery and recycling. The consumption of plastics in African countries is continuously growing up and the need of low-cost recycling methods is becoming more pressing. The purpose of this paper is an experimental investigation for recycling of plastic waste...
An electrostatic sheet stapler (ESS) that can paste a sheet material on a target by electrostatic force has been developed as an adherence and removal method for future sheet devices. The stapler was composed of two couples of needle to grid electrodes as positive and negative corona chargers with an insulator support dividing the two corona chargers. The proposed sheet material has two adherence...
Most particle counters of dust or smoke particles have a higher sensitivity than other detection systems and provide more information at least indicative of the filtering efficiency in the case of an electrostatic precipitator for example. This allows the intervention by the activation of automatic control systems for increasing the performance. But the major drawback of these detectors is their high...
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