Short Period Analysis of the Coma Drag Perturbation

This paper considers the distinction made by David Ricardo between “permanent” and “temporary” causes, which he sometimes refers to also as “stable” and “accidental” causes (seeThe Works and Correspondence of David Ricardo [hereinafter Works]I: 86, 88, 92; VI: 154), to derive implications useful to distinguish his approach from subsequent developments of the notions of short-period and long-period equilibrium. In particular, I trace the change of focus in the concept of “permanent” forces brought about by Alfred Marshall—from whose insights Alfred Kahn and John Maynard Keynes drew inspiration for their short-period analysis—which paved the way to fundamental changes in the method and theory.It is argued that Ricardo’s distinction maintains an heuristic value, in particular vis-à-vis the distinction between short and long period, which is part of the common language in standard economics.

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Seismology of the Oso-Steelhead landslide

Natural Hazards and Earth System Sciences Discussions ◽

10.5194/nhessd-2-7309-2014 ◽

2014 ◽

Vol 2 (12) ◽

pp. 7309-7327 ◽

Cited By ~ 5

Author(s):

C. Hibert ◽

C. P. Stark ◽

G. Ekström

Keyword(s):

Surface Waves ◽

Slope Failure ◽

Source Parameters ◽

Seismic Energy ◽

Seismic Signals ◽

Period Analysis ◽

Long Period ◽

Landslide Volume ◽

Short Period ◽

Seismic Records

Abstract. We carry out a combined analysis of the short- and long-period seismic signals generated by the devastating Oso-Steelhead landslide that occurred on 22 March 2014. The seismic records show that the Oso-Steelhead landslide was not a single slope failure, but a succession of multiple failures distinguished by two major collapses that occurred approximately three minutes apart. The first generated long-period surface waves that were recorded at several proximal stations. We invert these long-period signals for the forces acting at the source, and obtain estimates of the first failure runout and kinematics, as well as its mass after calibration against the mass-center displacement estimated from remote-sensing imagery. Short-period analysis of both events suggests that the source dynamics of the second are more complex than the first. No distinct long-period surface waves were recorded for the second failure, which prevents inversion for its source parameters. However, by comparing the seismic energy of the short-period waves generated by both events we are able to estimate the volume of the second. Our analysis suggests that the volume of the second failure is about 15–30% of the total landslide volume, which is in agreement with ground observations.

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AN APPROACH TO THE SHORT-PERIOD ANALYSIS OF PRIMARY-PRODUCINGECONOMIES 1

Oxford Economic Papers ◽

10.1093/oxfordjournals.oep.a040811 ◽

1959 ◽

Vol 11 (1) ◽

pp. 1-36 ◽

Cited By ~ 2

Author(s):

DUDLEY SEERS

Keyword(s):

Period Analysis ◽

Short Period

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Red variables in the OGLE-II database: first results for the LMC

International Astronomical Union Colloquium ◽

10.1017/s0252921100010332 ◽

2004 ◽

Vol 193 ◽

pp. 55-59

Author(s):

L.L. Kiss ◽

T.R. Bedding

Keyword(s):

Large Magellanic Cloud ◽

Variable Stars ◽

Red Giants ◽

Period Analysis ◽

Short Period ◽

First Results ◽

Red Giant ◽

Single Epoch ◽

Low Amplitude ◽

Radial Pulsations

AbstractWe present a period analysis of more then 23 000 red giants in the Large Magellanic Cloud observed by the OGLE-II microlensing project. Periods combined with the single-epoch 2MASS J H KS magnitudes revealed the complex distributions of stars in the period-luminosity plane. Besides four different sequences corresponding to different modes of pulsation in AGB stars, we also discovered two distinct and well-separated sequences below the tip of the Red Giant Branch, consisting of almost 10000 short-period and low-amplitude red variable stars. We propose that the majority are likely to be first ascent red giants, showing radial pulsations in the second and third overtone modes.

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Short-period and Long-period Analysis

Economic Progress ◽

10.1007/978-1-349-08440-1_18 ◽

1987 ◽

pp. 349-364

Author(s):

André Marchal

Keyword(s):

Period Analysis ◽

Long Period ◽

Short Period

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Study of Eclipsing Binary and Multiple Systems in OB Associations IV: Cas OB6 Member DN Cas

Publications of the Astronomical Society of Australia ◽

10.1017/pasa.2016.36 ◽

2016 ◽

Vol 33 ◽

Cited By ~ 3

Author(s):

V. Bakış ◽

H. Bakış ◽

S. Bilir ◽

Z. Eker

Keyword(s):

Orbital Period ◽

Early Type ◽

Eccentric Orbit ◽

Period Analysis ◽

Multiple Systems ◽

Spectroscopic Binary ◽

Short Period ◽

Synchronous Rotation ◽

The Masses ◽

Absolute Parameters

AbstractAn early-type, massive, short-period ($P_{\text{orb}}=2^d.310951$) eclipsing spectroscopic binary DN Cas has been re-visited with new spectral and photometric data. The masses and radii of the components have been obtained as $M_1=19.04\pm 0.07\,\text{M}_\odot$, $M_2=13.73\pm 0.05\,\text{M}_\odot$ and $R_1=7.22\pm 0.06\,\text{R}_\odot$, $R_2=5.79\pm 0.06\,\text{R}_\odot$, respectively. Both components present synchronous rotation ($V_{\text{rot}1}=160\,\text{km } \text{s}^{-1}$, $V_{\text{rot}2}=130\ \text{km} \,\text{s}^{-1}$) with their orbit. Orbital period analysis yielded a physically bound additional component in the system with a minimum mass of $M_3=0.88\,\text{M}_\odot$ orbiting in an eccentric orbit (e = 0.37 ± 0.2) with an orbital period of P12 = 42 ± 9 yr. High precision absolute parameters of the system allowed us to derive a distance to DN Cas as 1.7 ± 0.2 kpc which locates the system within the borders of the Cas OB6 association (d = 1.8 kpc). The space velocities and the age of DN Cas are in agreement with those of Cas OB6. The age of DN Cas (τ = 3–5 Myr) is found to be 1–2 Myr older than the embedded clusters (IC 1795, IC 1805, and IC 1848) in the Cas OB6 association, which implies a sequential star formation in the association.

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Dynamics of the Oso-Steelhead landslide from broadband seismic analysis

Natural Hazards and Earth System Science ◽

10.5194/nhess-15-1265-2015 ◽

2015 ◽

Vol 15 (6) ◽

pp. 1265-1273 ◽

Cited By ~ 28

Author(s):

C. Hibert ◽

C. P. Stark ◽

G. Ekström

Keyword(s):

Surface Waves ◽

Slope Failure ◽

Seismic Analysis ◽

Source Parameters ◽

Seismic Energy ◽

Period Analysis ◽

Long Period ◽

Landslide Volume ◽

Short Period ◽

Seismic Records

Abstract. We carry out a combined analysis of the short- and long-period seismic signals generated by the devastating Oso-Steelhead landslide that occurred on 22 March 2014. The seismic records show that the Oso-Steelhead landslide was not a single slope failure, but a succession of multiple failures distinguished by two major collapses that occurred approximately 3 min apart. The first generated long-period surface waves that were recorded at several proximal stations. We invert these long-period signals for the forces acting at the source, and obtain estimates of the first failure runout and kinematics, as well as its mass after calibration against the mass-centre displacement estimated from remote-sensing imagery. Short-period analysis of both events suggests that the source dynamics of the second event is more complex than the first. No distinct long-period surface waves were recorded for the second failure, which prevents inversion for its source parameters. However, by comparing the seismic energy of the short-period waves generated by both events we are able to estimate the volume of the second. Our analysis suggests that the volume of the second failure is about 15–30% of the total landslide volume, giving a total volume mobilized by the two events between 7 × 106 and 10 × 106 m3, in agreement with estimates from ground observations and lidar mapping.

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