The dynamical mechanism of A-B effect and its testing scheme

Abstract We estimate formation rates of LB-1-like systems through dynamical interactions in the framework of the theory of stellar evolution before the discovery of the LB-1 system. The LB-1 system contains a ∼70 ${M_{\odot}}$ black hole (BH), a so-called pair instability (PI) gap BH, and a B-type star with solar metallicity, and has nearly zero eccentricity. The most efficient formation mechanism is as follows. In an open cluster, a naked helium star (with ∼20 ${M_{\odot}}$) collides with a heavy main sequence star (with ∼50 ${M_{\odot}}$) which has a B-type companion. The collision results in a binary consisting of the collision product and the B-type star with a high eccentricity. The binary can be circularized through the dynamical tide with radiative damping of the collision product envelope. Finally, the collision product collapses to a PI-gap BH, avoiding pulsational pair instability and pair instability supernovae because its He core is as massive as the pre-colliding naked He star. We find that the number of LB-1-like systems in the Milky Way galaxy is ∼0.01(ρoc/104 ${M_{\odot}}$ pc−3), where ρoc is the initial mass densities of open clusters. If we take into account LB-1-like systems with O-type companion stars, the number increases to ∼0.03(ρoc/104 ${M_{\odot}}$ pc−3). This mechanism can form LB-1-like systems at least ten times more efficiently than the other mechanisms: captures of B-type stars by PI-gap BHs, stellar collisions between other types of stars, and stellar mergers in hierarchical triple systems. We conclude that no dynamical mechanism can explain the presence of the LB-1 system.

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A new dynamical mechanism for major climate shifts

Geophysical Research Letters ◽

10.1029/2007gl030288 ◽

2007 ◽

Vol 34 (13) ◽

pp. n/a-n/a ◽

Cited By ~ 131

Author(s):

Anastasios A. Tsonis ◽

Kyle Swanson ◽

Sergey Kravtsov

Keyword(s):

Dynamical Mechanism ◽

Climate Shifts

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MULTIFRACTAL FLUCTUATIONS OF JIUZHAIGOU TOURISTS BEFORE AND AFTER WENCHUAN EARTHQUAKE

Fractals ◽

10.1142/s0218348x13500011 ◽

2013 ◽

Vol 21 (01) ◽

pp. 1350001 ◽

Cited By ~ 9

Author(s):

KAI SHI ◽

WEN-YONG LI ◽

CHUN-QIONG LIU ◽

ZHENG-WEN HUANG

Keyword(s):

Wenchuan Earthquake ◽

Moving Average ◽

Long Term Memory ◽

Short Term ◽

Dynamical Mechanism ◽

Before And After ◽

Previous State ◽

Multifractal Behavior ◽

Multifractal Nature

In this work, multifractal methods have been successfully used to characterize the temporal fluctuations of daily Jiuzhai Valley domestic and foreign tourists before and after Wenchuan earthquake in China. We used multifractal detrending moving average method (MF-DMA). It showed that Jiuzhai Valley tourism markets are characterized by long-term memory and multifractal nature in. Moreover, the major sources of multifractality are studied. Based on the concept of sliding window, the time evolutions of the multifractal behavior of domestic and foreign tourists were analyzed and the influence of Wenchuan earthquake on Jiuzhai Valley tourism system dynamics were evaluated quantitatively. The study indicates that the inherent dynamical mechanism of Jiuzhai Valley tourism system has not been fundamentally changed from long views, although Jiuzhai Valley tourism system was seriously affected by the Wenchuan earthquake. Jiuzhai Valley tourism system has the ability to restore to its previous state in the short term.

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Research and Application on Screen Soft Proofing Technology in Printing Quality Control

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.262.263 ◽

2012 ◽

Vol 262 ◽

pp. 263-268

Author(s):

Zhan Jun Si ◽

Jia Wang ◽

Chong Gu

Keyword(s):

Quality Control ◽

Good Effect ◽

Color Management ◽

Actual Situation ◽

Testing Scheme ◽

Printing Quality ◽

Display Technology ◽

Soft Proofing ◽

Display Performance

In recent years, screen soft proofing has matured with the development of color management and display technology, and it has become the direction of printing development and the key of promotion. This article aimed at raising a testing scheme of display performance and adjusting scheme of corresponding display parameters, on this account to test the professional display’s performance, adjust display parameters and make color management. At the same time with reflecting the actual situation of display, a stable and accurate color reproduction environment was provided for screen soft proofing. After that, evaluations were carried out to evaluate printing quality of screen soft proofing on the condition that display’s performance was good, consequently the differences between proofing effects and final printing were studied. The result shows that this testing scheme of display performance can reflect the truth of display which is tested in this paper, the display after adjusted and color management according to this scheme shows good effect in the ability of screen analog proofing original, it can approach the requirements of the printing proofing.

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Dynamical Mechanism for Coexistence of Dispersing Species

Journal of Theoretical Biology ◽

10.1006/jtbi.2001.2404 ◽

2001 ◽

Vol 213 (1) ◽

pp. 53-72 ◽

Cited By ~ 16

Author(s):

MARY ANN HARRISON ◽

YING-CHENG LAI ◽

ROBERT D. HOLT

Keyword(s):

Dynamical Mechanism

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Data-driven modeling decadal-to-centennial ENSO variability and its response to external forcing

10.5194/egusphere-egu21-8370 ◽

2021 ◽

Author(s):

Aleksei Seleznev ◽

Dmitry Mukhin ◽

Andrey Gavrilov ◽

Alexander Feigin

Keyword(s):

Co2 Concentration ◽

Data Driven ◽

Time Interval ◽

Solar Forcing ◽

Russian Science ◽

Dynamical Mechanism ◽

Enso Variability ◽

The Past ◽

Sst Variability ◽

Data Driven Modeling

We investigate the decadal-to-centennial ENSO variability based on nonlinear data-driven stochastic modeling. We construct data-driven model of yearly Ni&#241;o-3.4 indices reconstructed from paleoclimate proxies based on three different sea-surface temperature (SST) databases at the time interval from 1150 to 1995 [1]. The data-driven model is forced by the solar activity and CO2 concentration signals. We find the persistent antiphasing relationship between the solar forcing and Ni&#241;o-3.4 SST on the bicentennial time scale. The dynamical mechanism of such a response is discussed.The work was supported by the Russian Science Foundation (Grant No. 20-62-46056)1. Emile-Geay, J., Cobb, K. M., Mann, M. E., & Wittenberg, A. T. (2013). Estimating Central Equatorial Pacific SST Variability over the Past Millennium. Part II: Reconstructions and Implications, Journal of Climate, 26(7), 2329-2352.

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Establishing a Proficiency Testing Scheme for Drinking Water Radiochemistry

10.1063/1.2979071 ◽

2008 ◽

Cited By ~ 1

Author(s):

Brian Brookman ◽

Emanuela Cincu ◽

Ioana Manea ◽

Mike Woods

Keyword(s):

Drinking Water ◽

Proficiency Testing ◽

Proficiency Testing Scheme ◽

Testing Scheme

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PARAMETRIC INSTABILITY IN SCALAR GRAVITATIONAL FIELDS

Modern Physics Letters A ◽

10.1142/s0217732312300236 ◽

2012 ◽

Vol 27 (24) ◽

pp. 1230023 ◽

Cited By ~ 1

Author(s):

TREVOR B. DAVIES ◽

CHARLES H.-T. WANG ◽

ROBERT BINGHAM ◽

J. TITO MENDONÇA

Keyword(s):

Gravitational Field ◽

Field Effect ◽

Strong Field ◽

Parametric Instability ◽

Spherically Symmetric ◽

Scalar Tensor Theory ◽

Subsequent Work ◽

Dynamical Mechanism ◽

Gravitational Fields ◽

Tensor Theory

We present a brief review on a new dynamical mechanism for a strong field effect in scalar–tensor theory. Starting with a summary of the essential features of the theory and subsequent work by several authors, we analytically investigate the parametric excitation of a scalar gravitational field in a spherically symmetric radially pulsating neutron star.

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Nonlinear Dynamics of a System of Coupled Oscillators With Essential Stiffness Nonlinearities

Volume 5: 19th Biennial Conference on Mechanical Vibration and Noise, Parts A, B, and C ◽

10.1115/detc2003/vib-48446 ◽

2003 ◽

Cited By ~ 2

Author(s):

Alexander F. Vakakis ◽

Richard H. Rand

Keyword(s):

Normal Modes ◽

Nonlinear Normal Modes ◽

Resonance Capture ◽

Periodic Motions ◽

Internal Resonances ◽

Dynamical Mechanism ◽

Elliptic Orbits ◽

Weakly Coupled ◽

Resonant Dynamics ◽

Nonlinear Normal

We study the resonant dynamics of a two-degree-of-freedom system composed a linear oscillator weakly coupled to a strongly nonlinear one, with an essential (nonlinearizable) cubic stiffness nonlinearity. For the undamped system this leads to a series of internal resonances, depending on the level of (conserved) total energy of oscillation. We study in detail the 1:1 internal resonance, and show that the undamped system possesses stable and unstable synchronous periodic motions (nonlinear normal modes — NNMs), as well as, asynchronous periodic motions (elliptic orbits — EOs). Furthermore, we show that when damping is introduced certain NNMs produce resonance capture phenomena, where a trajectory of the damped dynamics gets ‘captured’ in the neighborhood of a damped NNM before ‘escaping’ and becoming an oscillation with exponentially decaying amplitude. In turn, these resonance captures may lead to passive nonlinear energy pumping phenomena from the linear to the nonlinear oscillator. Thus, sustained resonance capture appears to provide a dynamical mechanism for passively transferring energy from one part of the system to another, in a one-way, irreversible fashion. Numerical integrations confirm the analytical predictions.

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