New aspects on the dielectric properties of the alkali halides with divalent impurities

Varotsos, P.; Miliotis, D.

doi:10.1016/s0022-3697(74)80101-0

Cited by 71 publications

(35 citation statements)

References 14 publications

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“…When solar radiation moves from an atmospheric layer into another, both reflection and refraction may occur that are fully described by the Fresnel equations. As far as the refraction is concerned, the refractive index is interrelated with a dielectric constant which depends on temperature and frequency (Varotsos and Miliotis, 1974;Varotsos, 1980;Kostopoulos et al, 1975). Regarding the reflection the term albedo is often used.…”

Section: Introductionmentioning

confidence: 99%

New spectral functions of the near-ground albedo derived from aircraft diffraction spectrometer observations

et al. 2014

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Abstract. The airborne spectral observations of the upward and downward irradiances are revisited to investigate the dependence of the near-ground albedo as a function of wavelength in the entire solar spectrum for different surfaces (sand, water, snow) and under different conditions (clear or cloudy sky). The radiative upward and downward fluxes were determined by a diffraction spectrometer flown on a research aircraft that was performing multiple flight paths near the ground. The results obtained show that the near-ground albedo does not generally increase with increasing wavelengths for all kinds of surfaces as is widely believed today. Particularly, in the case of water surfaces it was found that the albedo in the ultraviolet region is more or less independent of the wavelength on a long-term basis. Interestingly, in the visible and near-infrared spectra the water albedo obeys an almost constant power-law relationship with wavelength. In the case of sand surfaces it was found that the sand albedo is a quadratic function of wavelength, which becomes more accurate if the ultraviolet wavelengths are neglected. Finally, it was found that the spectral dependence of snow albedo behaves similarly to that of water, i.e. both decrease from the ultraviolet to the near-infrared wavelengths by 20-50 %, despite the fact that their values differ by one order of magnitude (water albedo being lower). In addition, the snow albedo vs. ultraviolet wavelength is almost constant, while in the visible near-infrared spectrum the best simulation is achieved by a second-order polynomial, as in the case of sand, but with opposite slopes.

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Section: Introductionmentioning

confidence: 99%

New spectral functions of the near-ground albedo derived from aircraft diffraction spectrometer observations

et al. 2014

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“…Before an earthquake, the pressure increases in the future focal area and produces changes in various physical properties like porosity, conductivity , dielectric constant (Varotsos, 1978(Varotsos, , 1980, etc. In addition, it affects the relaxation time of electric dipoles which are formed in an ionic solid between introduced aliovalent impurities (Varotsos and Miliotis, 1974) and vacancies created for charge compensation (Varotsos and Mourikis, 1974;Kostopoulos et al, 1975). This relaxation time, τ , is given by the equation…”

Section: Introductionmentioning

confidence: 99%

Power law relationship between parameters of earthquakes and precursory electrical phenomena revisited

Dologlou

2009

Nat. Hazards Earth Syst. Sci.

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Abstract. The power law relation between the stress drop of "non thrust" earthquakes and the lead time of precursory Seismic Electric Signals (SES), obtained by Dologlou (2008a), has been tested by using additional data from the most recent earthquake that occurred on 8 June 2008, in Andravida, NW. Peloponnesus, Greece and from two other destructive earthquakes that occurred in the past in Ionian sea. A critical exponent α=0.33 is derived which is close to the one (e.g. 0.29) reported by Dologlou (2008a). The above preliminary result strengthens the hypothesis that probably signatures of criticality are present in the earthquake preparation and precursory SES processes and that both phenomena are governed by same physics.

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“…Both the aforementioned procedures assume that no additional aliovalent impurities are present in the mixed system that may influence the dielectric and electrical properties [63][64][65].…”

Section: The Modelmentioning

confidence: 99%

A simple model for calculating the compressibility of the transition-metal carbides and nitrides alloys ZrxNb1−xC and ZrxNb1−xN

Katsika-Tsigourakou

2011

Open Physics

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The 4d-transition-metals carbides (ZrC, NbC) and nitrides (ZrN, NbN) in the rocksalt structure, as well as their ternary alloys, have been recently studied by means of a first-principles full potential linearized augmented plane waves method within the local density approximation. These materials are important because of their interesting mechanical and physical properties, which make them suitable for many technological applications. Here, by using a simple theoretical model, we estimate the bulk moduli of their ternary alloys ZrxNb1−xC and ZrxNb1−xN in terms of the bulk moduli of the end members alone. The results are comparable to those deduced from the first-principles calculations.

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New aspects on the dielectric properties of the alkali halides with divalent impurities

Cited by 71 publications

References 14 publications

New spectral functions of the near-ground albedo derived from aircraft diffraction spectrometer observations

New spectral functions of the near-ground albedo derived from aircraft diffraction spectrometer observations

Power law relationship between parameters of earthquakes and precursory electrical phenomena revisited

A simple model for calculating the compressibility of the transition-metal carbides and nitrides alloys ZrxNb1−xC and ZrxNb1−xN

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