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Plasma-discharges using nanosecond repetitive high voltage pulses has been very effective for the stabilization of lean flame1. To explain the chemical mechanisms of active species production by pulsed discharges, a two-step mechanism was proposed to explain the production of high densities of atomic oxygen. This mechanism first creates excited electronic states of nitrogen, which then dissociate...
This study focuses on the generation and loss of reactive oxygen species (ROS) in low-temperature atmospheric-pressure rf (13.56MHz) He+O2+H2O plasmas, which are of interest for many biomedical applications.
Explosive emission cathodes are generally used to produce high-power electron beams1, 2. Therefore, considerable study is being given to the expanding cathode plasma, its characteristics, and the velocity of motion of the plasma front at the initial stage of explosive emission, when we deal with essentially nonideal high-density plasma. One of the most important problems in constructing a model of...
In this contribution we present the results of experimental studies of the pinch evolution on the PF-1000. The calibrated magnetic probes in different radial positions were correlated with neutron production and with interferometry images. The characteristics of probe measurement of azimutal magnetic field on the PF-1000 were published in [1]. The transformations of the pinched column during different...
Water quality, its mineralization and chemical composition, particularly pH and nitrogen compounds, play crucial role in plant's development and growth. Treatment of water with plasma results in change of its properties and chemical composition, which in turn may affect plant growth process and subsequently agriculture produce quality.
There are many current and potential applications for plasmas created in conducting liquids and particularly in isotonic saline solution1. As a result there is interest in the physics of the plasma production, how it is sustained, the type of plasmas produced, their parameters and the subsequent plasma produced chemistry. There have been a number of studies of various topics in this list2 however...
Plasma Focus device are simple and effective sources of neutrons produced in deuterium-deuterium reactions. The PF-1000 device, placed at IPPLM in Warsaw, is a facility used to study of mechanisms of D(d,n)3He reactions due to relatively high neutron yields and the convenient horizontal position of the device axis.
High-current (1–3 MA) reflex triodes are being developed as intense pulsed sources of moderate energy (200–1200 kV endpoint) bremsstrahlung. A triode consists of three coaxial electrodes: two cathodes and a flat anode foil between them. The grounded cathodes emit electrons that produce bremsstrahlung in the positive high voltage anode. The anode is made from thin tantalum to minimize attenuation of...
Proton-beam-generation experiments have been conducted on the NRL Mercury pulsed-power generator operating in positive polarity with a lithium metal target embedded in the cathode. The accelerating voltage was limited to below 2.7 MV in order to limit the energy of neutrons produced in the 7Li(p,n)7Be reaction (Q = 1.88 MeV) to below 1 MeV. Analyses based on published results1 and calculations presented...
The generation of attosecond laser pulses is an area of active research. This research is motivated by the potential for these pulses to serve as powerful new tools for probing the physics of entirely new regimes and timescales. Consequently, the generation of attosecond pulses using the interaction of a femtosecond-scale laser pulse with a solid target, preceded by a variable-length-scale pre-plasma,...
Thermal plasma-based processes are the effective technique for the production of nanoparticle of elements, their inorganic compounds and composites. The binary W (80 mass %) -Cu and ternary W (95 mass %) -Ni-Fe systems have been produced as nanoparticles by chemical condensation from gas in thermal plasma jet at atmospheric pressure. Powdered mixtures of metal oxides WO3 - CuO and WO3 - NiO - Fe2O...
A double dielectric barrier coaxial reactor has been used to synthesize ammonia from nitrogen and hydrogen using argon as a carrier gas. This process has the advantage over the regular Haber process of not requiring very high pressures to carry out the reaction and being scalable to small production, attractive for self-consumption on a small agricultural operation.
Compact pulsed power of a table top size has been developed by using the magnetic pulse compression circuit with saturable cores as closing switches. This high repetitive and reliable pulsed power generator is widely used in universities, companies and institutions.
During the last decade non-thermal (multiphase) atmospheric pressure plasmas have received a tremendous increase of attention in view of their potential in biomedical, chemical, environmental and material processing applications.
There are several publications claiming to describe production of hydrogen from biogas using plasma-catalyst systems1. However, the authors has used a mixture of methane with carbon dioxide simulating a biogas but without any additives which are present in real biogas such as water vapour, H2S and NH3. Such a simple simulation of biogas is not appropriate when the outlet gas is going to be used with...
Compact neutron generators with a low power consumption can be used in portable material analysis, active interrogation and oil-well logging application. Important parameters for these generators are size, energy use, neutron yield and lifetime. Today, plasma sources using either hot or cold cathode discharge are in use, many applications also rely on radioactive material for neutron production. We...
Atmospheric pressure plasmas are investigated more and more in view of environmental en biomedical applications. One of the active species that are important for applications such as air cleaning is the OH radical1. This radical is ubiquitous in the water containing air plasmas and is very efficient due to its high oxidation potential.
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