A review of mainly the past two years is undertaken industrial applications pulsed power. Repetitively operated power generators with a moderate peak have been developed for applications. These are reliable and low maintenance. Development helps promote such things as food processing, medical treatment, water exhaust gas ozone generation, engine ignition, ion implantation others. Here, classified by application biological effects, streamer discharges in gases, liquid or liquid- mixture,...

Industrial applications using pulsed power technologies have been developed in many fields. One of them is the treatment exhaust gas by uniformly produced streamer discharges. Streamer discharges liquid also generate extremely high electric fields at tip streamers, as well energy electrons, ozone, other chemically active species, ultraviolet rays and shock waves. All these may be utilized to sterilize microorganisms decompose molecules materials. Large-volume water order realize industrial...

Pulsed power has been used to remove nitric oxide (NO) in a mixture of nitrogen, oxygen, and water vapor simulating the flue gases from station stack. The effect pulsewidth at fixed applied voltage on NO removal concentration was studied. dependence energy efficiency pulsewidth, ratio discharge current investigated. This increases with decreasing NO.

High repetition rate, high reliability and long lifetime are required for pulsed power generators environmental applications. Also, it is necessary to optimize the generator each application. Recent developments in described. In addition, recent research of gaseous phase pollution control using power, cleaning lake dam algae bloom by discharges, recycling concrete summarized.

This paper reports on the novel development of a fully solid state Marx-type circuit to achieve output voltage pulses with adjustable levels, pulse width, and frequency using series connection half-bridge or full-bridge switch-capacitor cells (SCC). Modularity allows independent control each SCC, resulting in more freedom pulsed power parameters. A 3-kW laboratory prototype proposed generator topology was implemented 1700-V insulated gate bipolar transistors (IGBTs) 1-kV supply. The SCC unit...

A pulsed discharge produced underwater has been an attractive method to treat waste water. For the optimization and realization of water treatment system utilizing discharge, modeling analysis could be one essential works. However, there is still no simulation work about due lack knowledge its characteristic parameters such as electron temperature, density, so on. In this paper, temperature density in a plasma are measured presented. magnetic pulse compressor (MPC) was developed used create...

A Blumlein generator that has a pulsewidth of 100 ns was used to investigate the process streamer discharge propagation in coaxial cylindrical reactor using streak camera. Both positive and negative polarities discharges were performed air at atmospheric pressure. The results showed primary secondary streamers propagated with increasing velocity from central rod outer cylinder electrode both applied voltages electrode. heads range 0.8-1.2 mm/ns for peak voltage 43-60 kV 0.6 -93 kV,...

Pulsed streamer discharge plasmas, one type of nonthermal plasma, have been used to treat exhaust gases. Since a pulsewidth applied voltage has strong influence on the energy efficiency removal pollutants, development short-pulse generator is paramount importance for practical applications. In this paper, nanosecond (ns) pulse which 5-ns duration in output pulsed developed, and NO-removal experiments using ns were conducted. The experimental results NO showed 100% ratio at 7 pps repetition...

Experimental investigation of HV short pulsed streamer discharges in dry air-fed ozonizers under various operating conditions are reported. Ozone concentration, energy input and ozone production yield (efficiency) were measured at voltages (14 to 37 kV), pulse repetition rates (25 400 pulses per second, pps), flow (1.5 3.0 1/min) different gap spacings (10 20 mm) a pressure 1.01/spl times/10/sup 5/ Pa air. A spiral copper wire (1 mm diameter) made cylindrical configuration (18 38 concentric...

The propagation features of a streamer discharge in water have been investigated. Based on the experimental data obtained study discharges nonuniform electric field, due streamers is explained as evaporation at tip and around it. energy balance process calculated for sub-microsecond distilled water. It shown that released pre-breakdown sufficient to evaporate liquid channels. Similar velocity both tap substantiates negligible effect ionic current density onto process. These estimations,...

Pulsed streamer discharges have been extensively used in many applications such as control of NO/sub X/ and SO/sub 2/ from exhaust gases, treatment dioxins, removal volatile organic compounds, generation ozone, laser excitation. An operation with a high energy efficiency is necessary for practical applications. It very important to know the propagation mechanism order improve pulsed discharge systems. In this paper, emission coaxial electrode system air at 0.1 MPa was observed using...

Streamer discharges in tap water and distilled have been generated by applying a voltage pulse from 120 to 175 kV 500 ns duration wire-to-electrode configuration. Electrical optical diagnostics were used explore the temporal development of streamers water, at various applied voltages both polarities. With wire serving as anode, multiple, parallel streamer generated. The number density these along decreases with decreasing electric field on surface wire. dependence indicates role enhancement...

Optical-absorption change following photoexcitation of the lowest triplet self-trapped exciton (STE) in NaCl has been measured femtosecond time regime. It is found that a short-lived intermediate state generated within 1 ps and decays accompanied by restoration STE. An oscillation population STE with period 1.1 was observed. Formation Frenkel pairs to occur not at initial stage relaxation but as result leading

This paper describes the process of narrow band pulsed electric fields (NPEFs) and its effect on mammalian cells. The NPEF consists a pulse modulated sinusoidal wave (PMSW), which allows delivery well-defined in terms frequency, field strength deposition energy to biological systems. 100 mus long with frequency 0.02, 2 or 50 MHz strengths up kV/cm are applied CHO cells variation DNA density investigated by means Acridine Orange assay. experiments indicate that cause degradation without cell...

Micrometer size plasmas, or microplasmas, find applications in pollution control, reduction, and prevention.The required nonthermal plasmas can be generated by either an electron beam electric discharge.The pulse widths voltages necessary to generate these are 10 -10 8 s, 3 4 V, respectively, depending on the application.The energy is typically low J range.This paper presents a novel circuit design high-voltage pulses with variable rise fall times 9 s regime.The employs two parallel Marx...

A solid-state Marx generator with a short pulsewidth not restrained by the maximum operating frequency of employed semiconductor switches is proposed for adapting to various pulsed power applications. This repetitive capable controlling voltage level, polarity, pulsewidth, and each pulse. The topology based on fully concept using series connection full-bridge switch-capacitor cells (SCCs). Independent control combination SCCs' operation mode result in greater freedom pulse parameter. An...

A mechanism explaining the breakdown of dielectrics with high intrinsic inhomogeneity like natural rocks and concrete is proposed proved experimentally. This work has a very promising industrial application in drilling demolition artificial solid materials by electric pulses. The includes gas cavities inside dielectric on its surface. At applied voltage, field causes cavities. displacement conduction currents flowing through number such result heating plasma pressure pulse generation. pulsed...

The production of ozone was investigated using a dielectric barrier discharge in oxygen, and employing short-duration pulsed power. dependence the concentration (parts per million, ppm) yield (g(O/sub 3/)/kWh) on peak voltage (17.5 to 57.9 kV) pulse repetition rate (25 400 pulses/s, pps) were investigated. In present study, following parameters kept constant: pressure 1.01/spl times/10/sup 5/ Pa, temperature 26/spl plusmn/4/spl deg/C gas flow 3.0 1/min gaseous gap length 11 mm. A concentric...

The drilling and demolition by low-duration, high-voltage electric pulses is based on the fact that, for very short times, breakdown inside solid dielectric occurs faster than surface flashover benveen electrodes. It was shown that most dielectrics could be broken down in insulating liquids, such as transformer oil, diesel fuel, even water. This study includes experimental theoretical results of rocks including oil fuel.

Nitric monoxide (NO) is increasingly being used in medical applications. Currently, a gas cylinder of N/sub 2/ mixed with high concentration NO used. This arrangement potentially risky due to the possibility accidental leak from cylinder. The presence air leads formation nitric dioxide (NO/sub 2/), which toxic lungs. Therefore, an on-site generation would be very desirable for patients acute respiratory distress syndrome and other related illnesses. We have recently reported on production...

A pulsed power generator with a nanosecond pulsewidth has been developed and applied to ozone production. Coaxial reactors connected in parallel are used the experiment. The system production yield, which is evaluated from initial energy primary storage capacitors, approximately 190 g/kWmiddoth when dry oxygen as ingredient gas. four-parallel chamber reactor gives higher concentrations of yields experimental conditions. This seems be most suitable obtain proper streamer corona volume also...