The simple power law of the critical flow stress by solution hardening with respect to the aggregation of Ca impurities in NaCl

1976 ◽  
Vol 34 (1) ◽  
pp. 165-173 ◽  
Author(s):  
F. Fröhlich ◽  
P. Grau ◽  
M. Suszynska
Keyword(s):  
Flow Stress ◽  
Power Law ◽  
Critical Flow ◽  
Solution Hardening ◽  
Simple Power

scholarly journals X-ray Properties of 3C 111: Separation of Primary Nuclear Emission and Jet Continuum

Universe ◽  
2020 ◽  
Vol 6 (11) ◽  
pp. 219
Author(s):  
Elena Fedorova ◽  
B.I. Hnatyk ◽  
V.I. Zhdanov ◽  
A. Del Popolo
Keyword(s):  
Accretion Disk ◽  
Power Law ◽  
Line Emission ◽  
High Energy ◽  
Power Law Model ◽  
X Ray ◽  
Additional Information ◽  
Observational Dataset ◽  
Simple Power ◽  
Photon Index

3C111 is BLRG with signatures of both FSRQ and Sy1 in X-ray spectrum. The significant X-ray observational dataset was collected for it by INTEGRAL, XMM-Newton, SWIFT, Suzaku and others. The overall X-ray spectrum of 3C 111 shows signs of a peculiarity with the large value of the high-energy cut-off typical rather for RQ AGN, probably due to the jet contamination. Separating the jet counterpart in the X-ray spectrum of 3C 111 from the primary nuclear counterpart can answer the question is this nucleus truly peculiar or this is a fake “peculiarity” due to a significant jet contribution. In view of this question, our aim is to estimate separately the accretion disk/corona and non-thermal jet emission in the 3C 111 X-ray spectra within different observational periods. To separate the disk/corona and jet contributions in total continuum, we use the idea that radio and X-ray spectra of jet emission can be described by a simple power-law model with the same photon index. This additional information allows us to derive rather accurate values of these contributions. In order to test these results, we also consider relations between the nuclear continuum and the line emission.

scholarly journals HELICAL MAGNETIC FIELDS FROM INFLATION

2009 ◽  
Vol 18 (09) ◽  
pp. 1395-1411 ◽  
Author(s):  
LEONARDO CAMPANELLI
Keyword(s):  
Magnetic Fields ◽  
Power Law ◽  
Background Field ◽  
Wave Number ◽  
Conformal Time ◽  
De Sitter ◽  
Simple Power ◽  
Dimensionless Constant ◽  
Real Positive Number

We analyze the generation of seed magnetic fields during de Sitter inflation considering a noninvariant conformal term in the electromagnetic Lagrangian of the form [Formula: see text], where I(ϕ) is a pseudoscalar function of a nontrivial background field ϕ. In particular, we consider a toy model that could be realized owing to the coupling between the photon and either a (tachyonic) massive pseudoscalar field or a massless pseudoscalar field nonminimally coupled to gravity, where I follows a simple power law behavior I(k,η) = g/(-kη)β during inflation, while it is negligibly small subsequently. Here, g is a positive dimensionless constant, k the wave number, η the conformal time, and β a real positive number. We find that only when β = 1 and 0.1 ≲ g ≲ 2 can astrophysically interesting fields be produced as excitation of the vacuum, and that they are maximally helical.

Prediction of Bubbles, Crashes, and Antibubbles

2017 ◽  
Author(s):  
Didier Sornette
Keyword(s):  
Stock Market ◽  
Case Studies ◽  
Power Law ◽  
Statistical Tests ◽  
Statistical Significance ◽  
Large Market ◽  
Simple Power ◽  
Market Crashes ◽  
Successes And Failures

This chapter examines how to predict stock market crashes and other large market events as well as the limitations of forecasting, in particular in terms of the horizon of visibility and expected precision. Several case studies are presented in detail, with a careful count of successes and failures. After providing an overview of the nature of predictions, the chapter explains how to develop and interpret statistical tests of log-periodicity. It then considers the concept of an “antibubble,” using as an example the Japanese collapse from the beginning of 1990 to the present. It also describes the first guidelines for prediction, a hierarchy of prediction schemes that includes the simple power law, and the statistical significance of the forward predictions.

Stress equivalence in the theory of solution hardening

1982 ◽  
Vol 381 (1781) ◽  
pp. 285-292 ◽  
Keyword(s):  
Flow Stress ◽  
Solid Solutions ◽  
Solute Atom ◽  
Activation Volume ◽  
Stress Dependence ◽  
Solution Hardening ◽  
As Stress

Basinski et al. have shown that if solid solutions of two different solutes in copper (or in silver) have the same flow stress at a given temperature, then they have the same activation volume. This result is known as stress equivalence. The activation volume may greatly exceed the volume associated with a single solute atom, and, over a tenfold range of flow stress or, is roughly proportional to 0~2/3. It is shown that these results follow naturally from Labusch’s theory of solution hardening, in which a dislocation overcomes a group of obstacles simultaneously, although the predicted stress dependence of the activation volume is about 0-1/2 At high stresses the activation volume drops sharply as a result of a change from a regime in which the two partials of a dissociated dislocation move in a coordinated manner to a regime in which the partials move independently. This transition also shows stress equivalence, as is observed. At low stresses there is a transition to Friedel statistics, in which the two partials in a coordinated manner overcome obstacles singly. The position of this transition should not show stress equivalence, and the experiments provide no evidence in this region. The activation volume in Friedel statistics should be proportional to 0- 2

Critical flow stress of air grown NaCl:Ca crystals annealed between 200 and 300°C

1980 ◽  
Vol 61 (1) ◽  
pp. 189-194 ◽  
Author(s):  
P. Grau ◽  
M. Czapelski ◽  
G. Berg ◽  
G. Klahre ◽  
M. Suszynska
Keyword(s):  
Flow Stress ◽  
Critical Flow

scholarly journals Angular power spectra of Galactic HI

2006 ◽  
Vol 2 (S237) ◽  
pp. 413-413
Author(s):  
D. A. Green
Keyword(s):  
Power Law ◽  
Galactic Plane ◽  
Power Spectra ◽  
Simple Power ◽  
Angular Scale

AbstractAs an alternative to identifying and then studying particular features seen in Galactic HI 21-cm images, studies of the angular power spectra of the emission provide a concise, statistical description of HI emission. The angular power spectra of several fields near l = 140°, from the Canadian Galactic Plane Survey, as observed with the DRAO Synthesis Telescope, have been analysed in this way. The derived power spectra, which typically cover angular scales from about 0 · 15 to 0 · 9 degree, are generally well-fitted by a simple power-law dependence on angular scale.

Sign in / Sign up

Export Citation Format

Share Document