26 Result(s)
within
M. Ausloos
Solid State Physics
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Chapter
Electrical and Thermal Properties of Magnetically Ordered Metallic Compounds TbZn, TbGd And GdCd
Simple intermetallic compounds containing rare earth metals present interesting structural and magnetic properties resulting from the interplay between various interactions mainly crystal field and exchange. S...
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Chapter
Infrared Absorption Spectrum of Ionic Powders
The infrared absorption spectrum of powders has already been discussed elsewhere, and examined along different lines of approximation. We have solved exactly Maxwell’s equations for an arbitrary distribution o...
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Spin Reorientation Transition in Gadolinium
Accurate measurements of the temperature derivative of the electrical resistivity (dρ/dT) are used to investigate the 2nd-order spin reorientation transition in Gd at Tr = 223 K. We confirm the negligible role pl...
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Chapter
Electrothermal Instabilities at Magnetic Critical Points
Characteristic oscillations in the vicinity of magnetic ordering temperatures are explained in terms of the continuously forced ballast resistor model. Because of the highly non linear (I–V) characteristics in th...
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Thermodynamic Fluctuations and their Dimensionality in Ceramic Superconductors Out of Transport Properties Measurements
Information concerning the dimensionality of the thermal flustuations of the new high temperature ceramic superconductors, can be derived from the excess conductivity (paraeonductivity) near the transition tem...
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Article
Multi-affine analysis of typical currency exchange rates
For foreign currency exchange rates, multi-affine analysis can put quantitatively into evidence the differences between correlated (daily closing market) values and random walks in time dependent data. The H(q) s...
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Article
How the financial crash of October 1997 could have been predicted
From the analysis of (closing value) stock market index like the Dow Jones Industrial average and the S&P500 it is possible to observe the precursor of a so-called crash. This is shown on the Oct. 1987 and Oct...
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Article
Low q-moment multifractal analysis of Gold price, Dow Jones Industrial Average and BGL-USD exchange rate
An estimate of the low q-moment values of the assumed multifractal spectrum of Gold price, Dow Jones Industrial Average (DJIA) and Bulgarian Lev - USA Dollar (BGL-USD) exchange rate over a 6 1/2 year time span ha...
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Article
Visualizing the log-periodic pattern before crashes
We present a method for visualizing the pattern which we believe to be a precursor signature of financial crashes (or ruptures). The log-periodicity of the pattern is investigated through the envelope function...
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Article
A sharp decrease of resistivity in La0.7Ca0.3Mn0.96Cu0.04O3: Evidence for Cu-assisted coherent tunneling of spin Polarons
Nearly a 50% decrease of the resistivity ρ(T, x) is observed upon just 4% Cu do** at the Mn site of La2/3Ca1/3Mn1−x CuxO3. When the observed phenomenon is attributed to a decrease of the spin-polaron energy E σ
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Article
Negative magnetoresistance in mixed-valence La0.6Y0.1Ca0.3MnO3: Evidence for charge localization governed by the Curie-Weiss law
The colossal negative magnetoresistance Δρ observed in La0.6Y0.1Ca0.3MnO3 at B=1 T shows an unusual, nearly perfect symmetry (around the peak temperature T 0=160 K), suggestive of a Curie-Weiss-dominated transpor...
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Article
Probing the field-induced variation of the chemical potential in Bi2Sr2CaCu2Oy via magneto-thermopower measurements
Approximating the shape of the magneto-thermoelectric power (TEP) ΔS(T,H) measured in Bi2Sr2CaCu2Oy by an asymmetric linear triangle of the form ΔS(T,H)≃S p (H)±B ±(H)(T ...
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Article
Monte-Carlo analysis of tracer diffusion mechanisms in YBa2Cu3O6+c
A method for estimating, via the Monte-Carlo simulation, the most often realized diffusion mechanisms in 2D ordered structures is presented. Taking as an example the diffusion of oxygen ions in 123 — YBCO high te...
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Article
Anomalous temperature behavior of the resistivity in lightly doped manganites around a metal-insulator phase transition
An unusual temperature and concentration behavior of the resistivity ρ(T, x) in La0.7Ca0.3Mn1−2x CuxO3 is observed at slight Cu do** (0≤x≤0.05). Namely, the introduction of copper results in a splitting of the ...
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Article
Simultaneous measurements of thermal diffusivity, thermal conductivity and thermopower with application to copper and ceramic superconductors
A home made experimental set-up allows us to measure the thermal conductivity, the thermopower and the thermal diffusivity simultaneously in the temperature range (20-300 K). Therefore the specific heat can be...
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Article
False Euro (FEUR) exchange rate correlated behaviors and investment strategy
We have searched for correlations and anticorrelations with respect to currencies as CHF, DKK, JPY, and USD in order to understand the EUR behavior. In order to do so we have invented a false euro (FEUR) dating b...
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Article
Special issue on Econophysics
What is “Econophysics"? Who is an “econophysicist"? The coining of a new scientific term, composed of the names of two fields, traditionally considered to be far from each other, brings new dreams to investiga...
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Article
Are EUR and GBP different words for the same currency?
The British Pound (GBP) is not part of the Euro (EUR) monetary system. In order to find out arguments on whether GBP should join the EUR or not correlations are calculated between GBP exchange rates with respect ...
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Article
Mechanistic approach to generalized technical analysis of share prices and stock market indices
Classical technical analysis methods of stock evolution are recalled, i.e. the notion of moving averages and momentum indicators. The moving averages lead to define death and gold crosses, resistance and support ...
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Article
Foam imbibition in microgravity
We report an experimental study of aqueous foam imbibition in microgravity with strict mass conservation. The foam is in a Hele-Shaw cell. The bubble edge width ℓ is measured by image analysis. The penetration...
