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Dielectric Liquids, 2005. ICDL 2005. 2005 IEEE International Conference on

Date June 26 2005-July 1 2005

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Displaying Results 1 - 25 of 113
  • 2005 IEEE International Conference on Dielectric Liquids

    Publication Year: 2005 , Page(s): 0_1
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    Freely Available from IEEE
  • 2005 IEEE International Conference on Dielectric Liquids (IEEE Cat. No.05CH37643)

    Publication Year: 2005
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    Freely Available from IEEE
  • 2005 IEEE International Conference on Dielectric Liquids

    Publication Year: 2005 , Page(s): ii
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    Freely Available from IEEE
  • Fundamental physics with noble liquid detectors

    Publication Year: 2005 , Page(s): 1 - 12
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (806 KB) |  | HTML iconHTML  

    The "standard model" of particle physics describes with astounding accuracy our world at energies below 100 GeV. Physics at the 1000 GeV scale will be explored with the large hadron collider (LHC), scheduled to become operational at CERN during 2007. While the LHC will arguably provide a quantum leap in our understanding, complementary experiments are being prepared to study a range of fundamental... View full abstract»

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  • Electron and ion transport in dense gases

    Publication Year: 2005 , Page(s): 13 - 20
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (715 KB) |  | HTML iconHTML  

    A review of the research on the electron and ion transport in dense gases is presented. The investigation of the transport properties of electrons in dense gases aims at understanding the dynamics and energetics of electron states in a dense medium and at elucidating how their nature and scattering properties evolve as the environment changes. The quantum nature of electrons couples them to the en... View full abstract»

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  • The peculiarities of transient currents in dielectric liquids

    Publication Year: 2005 , Page(s): 21 - 24
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1347 KB) |  | HTML iconHTML  

    Transient current or current-time characteristic gives very important information about conduction processes in dielectric liquids. The transient currents can be classified into three types as charging, discharging and reversal and the peculiarities of these currents are discussed. View full abstract»

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  • Ionization potential and nature of charge carriers of fluid hydrogen in wide pressure interval

    Publication Year: 2005 , Page(s): 25 - 28
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (283 KB) |  | HTML iconHTML  

    A simple model is used for estimating of the bottom energy of the electron conduction band and the electron-forbidden gap energy. It is shown that electrons in fluid hydrogens are localized not in electron bubbles, as was considered previously, but in molecular negative ions surrounded by voids about 0.5 nm in radius. The conductivity of fluid hydrogens at not very high pressures is connected to t... View full abstract»

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  • Thermal analysis of the dielectric behavior of complex liquids

    Publication Year: 2005 , Page(s): 29 - 31
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (220 KB) |  | HTML iconHTML  

    The system investigated is a multicomponent liquid, macroscopically monophasic, consisting of water spherical droplets stabilized by a surfactant shell, with diameter in the nano meter range, dispersed in a continuous hydrocarbon phase (oil). The system is thermodynamically stable. The dielectric properties of the above system were investigated at room temperature in the frequency range 1.6 KHz - ... View full abstract»

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  • A comparison between excited states detected through VUV photoionization and VUV photon absorption in dielectric liquids

    Publication Year: 2005 , Page(s): 33 - 36
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (953 KB) |  | HTML iconHTML  

    Some characteristic energies are observed in the first derivative of the photoionization spectrum of tetramethyl silane (TMS), cyclopentane, cyclohexane and 2,2 dimethyl butane. They could correspond to "autoionizing" states situated above the ionization threshold. Here we examine if they can be fitted to possible Rydberg series. These observations are crossed with recent data of some authors havi... View full abstract»

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  • Interface stability of oil-water system under electric stress

    Publication Year: 2005 , Page(s): 37 - 40
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (422 KB) |  | HTML iconHTML  

    The interface characteristics of oil-water system, under electric stress, are characterized through partial discharge (PD) measurements. Wavelet transform analysis is performed on the PD signals to yield unambiguous information of the events under electric stress. The intensity of PD as a function of electric stress is studied till the breakdown. A steady increase of PD magnitude as a function of ... View full abstract»

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  • Experimental study and computer simulation of surface conductivity at liquid/solid interface

    Publication Year: 2005 , Page(s): 41 - 43
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (289 KB) |  | HTML iconHTML  

    Surface conductivity at the interface between liquid and solid dielectrics is studied. The new method of determination of surface conductivity was used in experiments where both bulk and surface conductivity were recorded. Several types of interfaces of solid and liquid dielectrics with electrolytic additives were measured. Computer simulation based on the finite element method made it possible to... View full abstract»

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  • Time-of-flight method for determination of concentration of molecular impurity in atomic liquids

    Publication Year: 2005 , Page(s): 45 - 48
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (362 KB) |  | HTML iconHTML  

    The method is suggested for estimation of molecular impurity concentration in atomic liquids. The method is based on significant influence of the molecule impurities on electron drift velocity in the mixtures. The influence can be detected from time-of-flight measurement of mobility of electrons injected in the mixture. The electron mobility in the mixture is different from the mobility in poor at... View full abstract»

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  • Electroacoustic and dielectric dispersion of concentrated colloidal suspensions

    Publication Year: 2005 , Page(s): 49 - 52
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (575 KB) |  | HTML iconHTML  

    The determination of the permittivity of colloidal dispersions has demonstrated to be a very useful technique to characterize the electrical state of the solid/liquid interface. This is so because of its sensitivity to such features as particle size and shape, state of aggregation, surface charge, and so on. The dielectric dispersion data are particularly suited to the evaluation of the surface ch... View full abstract»

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  • Tunable pattern structures in dielectric liquids under high DC electric fields

    Publication Year: 2005 , Page(s): 53 - 56
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2011 KB) |  | HTML iconHTML  

    This work focuses on the abrupt changes that the application of large enough electric fields provokes in the internal structure of hematite/silicone oil suspensions. Experimental results reflect the existence of two well-defined structural patterns according to the strength of the field and the concentration of particles. At low electric fields, columns of particles between the electrodes can be o... View full abstract»

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  • High field conduction and prebreakdown phenomena in dielectric liquids

    Publication Year: 2005 , Page(s): 57 - 62
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (328 KB) |  | HTML iconHTML  

    The present paper is mainly devoted to phenomena occurring in point-plane electrode geometry, where breakdown is the result of initiation and propagation of prebreakdown phenomena called "streamers". Indeed, in this configuration, investigations of streamer initiation processes, which requires a very high electric strength (∼ MV/cm), and of propagation ones (requiring low electric field, ∼... View full abstract»

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  • Influence of gas bubbles on electrical discharges in small working gaps

    Publication Year: 2005 , Page(s): 63 - 66
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (659 KB) |  | HTML iconHTML  

    In the paper the first investigations on gas bubble evolution are presented. The research is based on video recording (VR) and high speed framing camera (HSFC) pictures, as well as theoretical considerations. Violent changes of gas bubbles generated in the consequence of single discharges are analyzed in the time interval of 100 μs (dissolving time) after the end of the pulse. This time corresp... View full abstract»

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  • Optical field dependence of breakdown in liquids by Q-switched lasers

    Publication Year: 2005 , Page(s): 67 - 70
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (304 KB) |  | HTML iconHTML  

    Probabilistic behavior of optical breakdown in water is investigated as a function of the laser intensity using Q-switched 1.06 μm and 0.532 μm lasers with 5-6 ns duration and is compared with the breakdown probability of air in which a avalanche mechanism is believed to govern the breakdown process. These results suggest us a mechanism of optical breakdown is the following. Initial electron... View full abstract»

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  • The incipient mode of streamers in a dielectric liquid as a function of electric field

    Publication Year: 2005 , Page(s): 71 - 74
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (643 KB) |  | HTML iconHTML  

    Many previous studies of electric breakdowns in dielectric liquids in point-plane geometry have examined the relationships among the breakdown structure (or speed) and the electrode geometry (point radius, gap length) and/or voltage. This paper explores the hypothesis that the electric field, not the geometry per se, is the determining factor in the incipient streamer structure in dielectric liqui... View full abstract»

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  • Breakdown processes in transformer insulation under LI voltages

    Publication Year: 2005 , Page(s): 75 - 78
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (335 KB) |  | HTML iconHTML  

    The work contributes to the understanding of breakdown processes in transformer oil/cellulose insulation under a LI (lightning impulse) voltage. The breakdown mechanism associated with streamer propagation, space charge distribution, material properties and insulation geometry is studied. The observed phenomena lead to a qualitative model which adds insight into the breakdown process in composite ... View full abstract»

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  • Peculiarities of formation of the impulse discharge in liquids: to the existence of transition zone attached to a potential electrode

    Publication Year: 2005 , Page(s): 79 - 82
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (490 KB) |  | HTML iconHTML  

    The complex experimental studies of the positive discharge mechanism in transformer oil have shown the presence of a primary channel in the transition zone. This "primary" or "elementary" channel is attached to the potential electrode and appears to be an essential element of the discharge process. As such, it should be accounted for while elaborating the general physical picture of the breakdown ... View full abstract»

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  • Effect of high-speed repetition of traveling wave voltage pulse on streamer initiation in water

    Publication Year: 2005 , Page(s): 83 - 86
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (965 KB) |  | HTML iconHTML  

    Time lag distributions for the streamer initiation in water subjected to a reciprocal traveling wave voltage pulse were measured as a fundamental study of water treatment for pollution control. A point-plane electrode gap in de-ionized water was connected with a capacitor which was charged and then grounded through a pulse-forming coaxial cable. Since the cable was directly grounded without any re... View full abstract»

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  • Models of pulse conductivity of streamers propagating in dielectric liquid

    Publication Year: 2005 , Page(s): 87 - 90
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (423 KB) |  | HTML iconHTML  

    The model of streamer growth in dielectric liquids was proposed that took into account impulse character of conductivity of streamer filaments and the change of their hydrodynamic characteristics. Our simulations show that proposed model with impulse conductivity ensures the growth of streamer structure. View full abstract»

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  • Characterization and spectroscopic study of positive streamers in water

    Publication Year: 2005 , Page(s): 91 - 94
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (445 KB) |  | HTML iconHTML  

    This paper first presents a characterization of positive streamers in pure water (conductivity ∼ 0.05 μS/cm), initiated by a fast rectangular impulse voltage in a point-plane electrode geometry. According to the conditions, two main streamers types can be observed, with average propagation velocities from 0.5 to 30 km/s. Then, a spectroscopic investigation of positive streamer propagation i... View full abstract»

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  • Modeling of phenol decomposition induced by pulsed corona discharge in water

    Publication Year: 2005 , Page(s): 95 - 98
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (324 KB) |  | HTML iconHTML  

    In this paper a chemical kinetics model of phenol decomposition in water by electrical discharge is presented. The model considers 69 reactions with 26 radicals, ions and molecules. The densities of the species participating in the chemical reactions were calculated with a set of first order differential equations describing the chemical conversions caused by the energy of the corona pulse in the ... View full abstract»

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  • Optical spectral diagnostics of electrical discharges in oil

    Publication Year: 2005 , Page(s): 99 - 101
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (350 KB) |  | HTML iconHTML  

    The subject matter of this paper refers to the application of optical spectral diagnostics for detection of electromagnetic waves generated by partial discharges. The research referred to two forms of partial discharges generated in oil: of the point-point and surface. The results obtained at this stage of research can constitute only a source material for people dealing with issues connected with... View full abstract»

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