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This conference provides an exchange of technical topics in the fields of Solid State Modulators and Switches, Breakdown and Insulation, Compact Pulsed Power Systems, High Voltage Design, High Power Microwaves, Biological Applications, Analytical Methods and Modeling, and Accelerators.
AMC2020 is the 16th in a series of biennial international workshops on Advanced Motion Control which aims to bring together researchers from both academia and industry and to promote omnipresent motion control technologies and applications.
All areas of ionizing radiation detection - detectors, signal processing, analysis of results, PET development, PET results, medical imaging using ionizing radiation
IEEE International Conference on Plasma Science (ICOPS) is an annual conference coordinated by the Plasma Science and Application Committee (PSAC) of the IEEE Nuclear & Plasma Sciences Society.
The IEEE International Microwave Symposium (IMS) is the world s foremost conference covering the UHF, RF, wireless, microwave, millimeter-wave, terahertz, and optical frequencies; encompassing everything from basic technologies to components to systems including the latest RFIC, MIC, MEMS and filter technologies, advances in CAD, modeling, EM simulation and more. The IMS includes technical and interactive sessions, exhibits, student competitions, panels, workshops, tutorials, and networking events.
The IEEE Aerospace and Electronic Systems Magazine publishes articles concerned with the various aspects of systems for space, air, ocean, or ground environments.
Experimental and theoretical advances in antennas including design and development, and in the propagation of electromagnetic waves including scattering, diffraction and interaction with continuous media; and applications pertinent to antennas and propagation, such as remote sensing, applied optics, and millimeter and submillimeter wave techniques.
Contains articles on the applications and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Power applications include magnet design as well asmotors, generators, and power transmission
The theory, design and application of Control Systems. It shall encompass components, and the integration of these components, as are necessary for the construction of such systems. The word `systems' as used herein shall be interpreted to include physical, biological, organizational and other entities and combinations thereof, which can be represented through a mathematical symbolism. The Field of Interest: shall ...
Methods, algorithms, and human-machine interfaces for physical and logical design, including: planning, synthesis, partitioning, modeling, simulation, layout, verification, testing, and documentation of integrated-circuit and systems designs of all complexities. Practical applications of aids resulting in producible analog, digital, optical, or microwave integrated circuits are emphasized.
2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), 2015
In this paper, we present a numerical simulation of the influence of water trees growing from semiconducting layers (in the interior and the exterior) in presence or not of space charges on the behavior of the cross-linked polyethylene (XLPE) insulation used in the medium voltage cables. Individual vented tree configurations are modeled under Comsol Multiphysics environment. To understand the mechanism ...
2017 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering (ISEF) Book of Abstracts, 2017
During operation of high-voltage direct current (HVDC) power cables heat is generated in the inner conductor and the insulation. As a result, a thermal breakdown may occur if more heat is generated than can be dissipated. The electric field stress due to space charges accumulating in the insulations superimposes the geometric electric field due to the applied voltage in the ...
2012 IEEE 7th International Conference on Industrial and Information Systems (ICIIS), 2012
Polymeric dielectrics are considered important for several inherent advantages over conventional dielectric materials. Low density polyethylene and cross linked polyethylene are being popularly used as insulation for ac cable application. However, application of these polymers for dc cable insulation is hindered with space charge accumulation. New materials with nano-sized particles included in base polymers were tried out with some successes. ...
Conference Record of the 1996 IEEE International Symposium on Electrical Insulation, 1996
Direct measurement of space charge and conduction current was carried out on low-density polyethylene degraded by ultraviolet radiation using a pulsed electro-acoustic (PEA) method. Dominant heterocharges were formed near both electrodes by high voltage application and was found to be deeply trapped. In this paper, the effect of temperature and electric field reversal on the detrapping and trapping of space ...
Proceedings of the 2004 IEEE International Conference on Solid Dielectrics, 2004. ICSD 2004., 2004
For the measurement of space charges profiles, various experimental techniques are available, the most known being the thermal and the acoustic methods. The methods we use for the determination of the space charges belong to the group of non-destructive thermal methods, called FLIMM (Focused Laser Intensity Modulation Method) and TSM (Thermal Step Method). These thermal methods are based on the ...
AuthorLab: More About the Types of IEEE APCs, and How to Order Reprints of Your Paper
NIKSUN World Wide Security & Mobility Conference 2011-Rajagopalan
GHTC 2015 - Impact of the ISS
Space Law The Final Frontier
Future of Space Exploration from the Leaders at Mars One, Astrobotic, and Teledyne Brown Engineering: Innovation Spotlight with Grant Imahara
Robotics History: Narratives and Networks Oral Histories:Gerd Hirzinger
APEC 2011 State-Space Averaging: Past, Present and Future
The Full Spectrum: Travelogue of the Atomic Age
IROS TV 2019-STAR LAB at the University of Surrey Space Technology for Autonomous systems & Robotics
Gastrointestinal Microbial Devices for Therapeutics in Space - Miguel Jimenez - IEEE EMBS at NIH, 2019
APEC 2011-NASA's Space Power Technologies
The Full Spectrum: COSMIC Satellites Use GPS to Forecast Weather
Visit to the Lightning Lab: Zapping Model Airplanes with Over 2 Million Volts
Synthetic Fuels to the Rescue?
Engineering the Big Bang
Space Exploration is Reinventing Healthcare – What’s the ROI? - Dorit Donoviel - IEEE EMBS at NIH, 2019
IEEE Region 5 Presents Stepping Stone Awards on the 50th Anniversary of Apollo 11
ROI from NASA to Health & Health Care on Earth - Aenor Sawyer - IEEE EMBS at NIH, 2019
Developing Automated Analysis Tools for Space/Time Sidechannel Detection - IEEE SecDev 2016
In this paper, we present a numerical simulation of the influence of water trees growing from semiconducting layers (in the interior and the exterior) in presence or not of space charges on the behavior of the cross-linked polyethylene (XLPE) insulation used in the medium voltage cables. Individual vented tree configurations are modeled under Comsol Multiphysics environment. To understand the mechanism of involved phenomena, an evaluation of the electric field distribution is carried out. The influence parameters adopted in this investigation are: the permittivity, the length of the water trees and the magnitude of the space charges. The results of investigation showed that, in the absence of space charges, water trees lead to a local increase (respectively decrease) of the electric field in the outside (respectively inside) areas of these trees. However, the accumulation of space charges induces a significant variation of electric field inside and outside the trees and in the volume of insulation. In fact, the electric field repartition depends on the magnitude of space charge density and space charge layer dimension. According to this repartition, the dynamic movement of the space charges is evoked.
During operation of high-voltage direct current (HVDC) power cables heat is generated in the inner conductor and the insulation. As a result, a thermal breakdown may occur if more heat is generated than can be dissipated. The electric field stress due to space charges accumulating in the insulations superimposes the geometric electric field due to the applied voltage in the cable. In this work, the thermal breakdown process is analyzed including the effects of these space charges. The breakdown voltage at different temperatures is computed in numerical simulations coupling the heat conduction equation and Poisson's equation for a suitably extended HVDC cable model. The results show the breakdown voltage depending on the temperature at the outer sheath. The breakdown voltage decreases or increases with increasing temperature and space charges, depending on the influence of the temperature distribution on the material.
Polymeric dielectrics are considered important for several inherent advantages over conventional dielectric materials. Low density polyethylene and cross linked polyethylene are being popularly used as insulation for ac cable application. However, application of these polymers for dc cable insulation is hindered with space charge accumulation. New materials with nano-sized particles included in base polymers were tried out with some successes. But the space charge formation is yet to be understood. Several attempts were made earlier to understand the relation between leakage current conduction in dielectrics and space charge formation. The author presents an understanding on the relation between conduction and space charge and also puts forth recent developments. How nanocomposites could possibly block space charges is also presented.
Direct measurement of space charge and conduction current was carried out on low-density polyethylene degraded by ultraviolet radiation using a pulsed electro-acoustic (PEA) method. Dominant heterocharges were formed near both electrodes by high voltage application and was found to be deeply trapped. In this paper, the effect of temperature and electric field reversal on the detrapping and trapping of space charges was investigated and the role of space charge in electrical conduction was discussed quantitatively. The main mechanism for detrapping and trapping of space charges was the Poole-Frenkel model.
For the measurement of space charges profiles, various experimental techniques are available, the most known being the thermal and the acoustic methods. The methods we use for the determination of the space charges belong to the group of non-destructive thermal methods, called FLIMM (Focused Laser Intensity Modulation Method) and TSM (Thermal Step Method). These thermal methods are based on the interaction between the thermal wave and the electric charges present in the insulator, which generates a pyroelectric current. Their thermal excitation process are different: the FLIMM method uses a laser beam modulated in intensity, on the other hand, the TSM method rests on the creation of a thermal step on one side of the sample. Knowing the pyroelectric current and the temperature profile, and using an appropriate mathematical deconvolution, the space charges distribution can be determined. In this paper, after detailing the principle of these two techniques, one will present the space charges profiles obtained for PET (polyethylene terephthalate) samples conditioned at different temperatures and electric fields.
The influence of electrodes on the space charge distribution in solid polymer electrolytes has been investigated. Aluminum-poly(ethylene oxide)-aluminum sample structures with varying distance between the metal electrodes are considered. The charge distribution in the poly(ethylene oxide) is extracted by differentiating twice the surface potential measured by the Kelvin Probe Force Microscopy. With this approach, charge oscillations and charge packets have been detected for the first time in solid electrolytes under biased and unbiased conditions.
UV irradiation produces irreversible damages in the dielectric insulators. Irradiation sources are numerous: partial discharges, parasitic discharges (environmental) or ambient light. The most known effect of irradiation is yellowing indicating an advanced material damage. We already have shown that before yellowing, space charges appear close to the irradiated surface, and increase with the irradiation time. In order to investigate more precisely this phenomenon, electroluminescence measurements and space charges detection were undertaken. For space charge measurements, the FLIMM (Focused Laser Intensity Modulation Method) technique was used. This non destructive method allows localized charges detection and also the carrying out of 3D cartographies with a very good spatial resolution. The studied material was 25 mum thick Poly(ethylene 2.6-naphthalate) (PEN). During the irradiation, the samples were protected by a mask, except a small circular area (D = 4 mm). In this paper, three-dimensional space charges and global electroluminescence (EL) and intensity profiles are shown. The discussion deals with the UV induced modification by studying the difference between the level signal in irradiated zone and a non irradiated one, and the performances of the detection techniques in terms of accuracy.
This work involves the study of the origin and effect of space charges in the electrospinning process. Electrospinning is a process used to make solid, nanofibrous polymer mats. These mats are used in tissue engineering as scaffolds for cells. The origin and effect of space charges in this process has not been well-studied.
Summary form only given. The plasma column left behind by ultrashort laser pulse filamentation is utilized to guide high voltage (HV) discharges in air. Many experiments have been carried out where the filament plasma is placed between two HV electrodes and a discharge is guided across the large gap (for example Ref ). Researchers still believe that one application could be potentially guiding lightning in the atmosphere, like a lightning rod, due to the longitudinal extent of the plasma ranging over several 10's of meters . However lab experiments can only demonstrate discharges over a few meters. The reason for this is still not very clear due to the overall physics of the process not being fully understood. Here, we present experimental results in air on the role of space charges and corona during the filament guided HV discharge. Our conclusion is that the main driver of the breakdown is an enhancement of the corona between the electrodes and that the electric fields available limit the discharge distance achievable.Filamentation is a non- linear process where non-linear selffocusing (due to the Kerr effect), diffraction, and plasma defocusing create a dynamic balance . The laser pulse propagates in a small beam diameter longer than the usual Rayleigh length. The plasma left behind the filament has a density on the order of 1016 cm-3 and a low conductivity. Initially it was believed that the plasma could directly guide HV discharges. However, a delay between the actual discharge and the filament placement is observed, ruling out the direct wire-like guiding mechanism. Previously, the reason for this delay was not completely understood. Our experimental results show that an enhancement of the formation of corona at the HV probes can be observed. From there, the dynamics rely on the electric field as a driver for developing leaders across the gap until a conducting connection is formed between the electrodes. These results show that the discharge distance is limited by the electric field and therefore limits the usefulness for the applications originally intended.
This study reports on investigations aiming to determine by numerical simulation the effect of space charges on the electrical and electromechanical constraints in microcavities contained in high-voltage cables insulation. The simulation is based on the numerical resolution of the Poisson equation by the finite element method. The authors calculate the electric field and they determine the electrostatical pressure for various space-charge density values. The elongation of microcavities is calculated for appreciating the effect of the electrostatical pressure on the walls of the cavity. The role of homocharges and heterocharges on constrains is studied and results of the simulation are in agreement with published technical literature.