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The generation of DC discharge in supercritical carbon dioxide using a point-plane electrode with the gap distance tens of mircometer is studied experimentally. The results reveal a strange phenomenon that there is a slightly drop of breakdown voltages in vicinity of supercritical phase. It is explained that the clusters formation and diffusion ability in SC CO2 (supercritical carbon dioxide) effect...
Microplasmas at or around atmospheric pressure gained rising attention recently. Their technological benefits and application-oriented flexibility allows microplasmas to explore new fields of plasma technology, e.g. biomedical applications. One particular type of microplasma sources that shows a variety of interesting physics and applications is the so called cold microplasma jet.
As we know, the risetime of the output voltage of a pulse power generator is mainly determined by the performance of the main discharge switch. Recently, to calibrate nanosecond pulse voltage dividers, A nanosecond pulse generator with an output voltage of 2–10 kV was constructed. The generator was composed of a DC charging source, a 50 Ohm coaxial cable as a pulse forming line (PFL), a self-breakdown...
Arc in vacuum circuit breakers operates in a diffuse mode in the low current range and transfers into a constricted mode when current is high. The constriction of the arc column leads to the concentration of current density and enhancement of heat flux density at the anode surface and further results in a rapid temperature rise of the anode material. Localized high temperature approaching the boiling...
The discharge efficiency in microdischarge cells strongly depends on the shape of the sustain waveform. Various shapes, such as the ramped-square sustain waveform and the sustain waveform with auxiliary address short pulse, have been studied to improve the discharge efficiency1, 2.
The issue of use of Boltzmann relation in magnetized plasmas has been recently again brought to attention by [1, 2]. Boltzmann relation for electrons is a usual assumption in fluid plasma modeling used also in fusion device modeling and it is in general a very good approximation, even though it strictly holds only for massless electrons. But when oblique or wall parallel magnetic field is considered,...
The behavior of a two-dimensional complex plasma during rapid cooling is investigated. The system consists of a single layer of micrometer sized melamine-formaldehyd spheres levitated in a plasma discharge. The particles initially arrange themselves in a hexagonal crystalline lattice. The crystalline order is then destroyed by a short electric pulse, and afterwards the system is left to crystallize...
Due to a growing demand for bottles made of polyethylene terephthalate (PET) fast and efficient sterilization processes as well as barrier coating to decrease gas permeation are required. Plasma sterilization is an alternative way of sterilizing PET without using toxic ingredients (e.g. hydrogen peroxide or peracetic acid). To allow investigations in the field of plasma sterilization of PET bottles,...
Vitrification using thermal plasma has been identified as a promising thermal treatment technology since it allows recycling and reusing the hazardous wastes, thus avoiding their landfill disposal1,2. Its predominant characteristics are high temperature and high energy density, which allows fast heat transfer at the reactor boundaries and correspondingly shorter treatment times during thermal processing...
Atmospheric pressure plasma jets offer a unique route to transport reactive chemical species generated under highly non-equilibrium conditions to a remote downstream sample; as such, they have become the device of choice in many biological and materials processing applications.1 While our understanding of the propagation mechanism behind the plasma plume is ever increasing,2 little is known of how,...
Plasma sterilization is known to be a promising alternative to common sterilization methods. Although lots of effort has been taken to investigate low-pressure plasma sterilization systems, only little effort has been taken to bring plasma sterilization to market. In this contribution we will present a plasma sterilization prototype for use in medical practice.
Solids are known to have crystalline structures, which are often disrupted by defects. Among them, dislocations are topological defects representing permanent deviations of atoms from their ideal periodicity in the crystal. Dislocations define many properties of crystalline materials: the motion of dislocations at the microscopic scale is known to be responsible for macroscopic deformations of materials...
Plasma resonance spectroscopy is a well established plasma diagnostic method realized in several designs. One of these designs is the multipole resonance probe (MRP)1. In its idealized - geometrically simplified - version it consists of two dielectrically shielded, hemispherical electrodes to which an RF signal is applied. A numerical tool is under development, which is capable of simulating the dynamics...
Plasma processes, particularly plasma etching and plasma deposition processes are crucial for a large variety of industrial manufacturing processes. For these processes the knowledge of the ion energy distribution function plays a key role. Measurements of the ion energy distribution function (IEDF) are at least challenging and often impossible in industrial processes. An alternative to measurements...
Experiments of electrical wire explosions (EEW) for nano-powder production were performed on a small-scale pulsed power device, which consists of a low-inductance capacitor bank of 2–4 µF typically charged to 8–25 kV. Titanium wires, 85 mm in length and 175 µm in diameter, were installed inside a discharge chamber filled with 5–50 kPa air. The peak discharge current is about 8–20kA with a rise time...
Electrical Explosion of thin metal wire has many important applications such as wire array load in Z-pinch, synthesis of nanometer powder, generation of shock wave, et al. The explosion plasma has crucial significance in these applications1,2. Plasma characteristics of the explosion plasma is powerful method to study basic process of electrical explosion of wire. In this paper, the explosion plasma...
Plasma display with large cell size is gaining attention for the application of large outdoor public and transparent display. In the previous work, it has been shown that the efficacy of opposite discharge reaches to 18 lm/W, while that of surface discharge is about 5 lm/W.[1,2] As a follow-up research, discharge properties of PDP cell having diagonally opposite electrode have been investigated in...
Microplasmas generated within cavities having the form of a truncated paraboloid, introduced by Kim et al. [Appl. Phys. Lett. 94, 011503 (2009)], have been simulated numerically with a two-dimensional, fluid computational model. Microcavities with parabolic sidewalls, fabricated in nanoporous alumina (Al2O3) and having upper (primary emitter) and lower apertures of 150 µm and 70 µm in diameter, respectively,...
Intracellular reactive oxygen species (ROS) is a known activator of cell signaling, however too much ROS causes cell death. Our goal was to determine the optimal microsecond-pulsed Dielectric Barrier Discharge plasma (DBD-plasma) treatment dose (J/cm2) in which ROS/redox responses would potentially activate cell function but not cell death. In this study, we applied DBD-plasma to mesenchymal cells...
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