We propose a relation which predicts the low-frequency thermal conductivity of one-dimensional (1D) system from and bulk viscosity at higher frequency. Our theory is based on assumption that ``ballistic'' transport by sound waves dominates heat transport. For with equal capacities $({c}_{p}={c}_{v})$ this particularly simple. test prediction simulating chain particles quartic interparticle potentials under zero pressure conditions. As frequency $\ensuremath{\omega}\ensuremath{\rightarrow}0$...

Two universality classes for thermal transport in one-dimensional oscillator systems are proposed. In class A the asymptotic behavior of frequency dependent conductivity is $\ensuremath{\kappa}(\ensuremath{\omega})\ensuremath{\sim}{\ensuremath{\omega}}^{\ensuremath{-}1/2}$, whereas bulk viscosity finite. B $\ensuremath{\kappa}\ensuremath{\sim}{\ensuremath{\omega}}^{\ensuremath{-}\ensuremath{\alpha}}$, where $\ensuremath{\alpha}<0.4$, and has same as conductivity. It further proposed that...

A one-dimensional system of particles is examined in which even numbered are bound to adjacent by harmonic spring forces, while odd free. Even and collide elastically. This a momentum conserving modification the famous "ding-a-ling" model. Molecular-dynamics simulations carried out current power spectra obtained. The energy spectrum has zero slope at low frequencies. implies that thermal conductivity κ finite independent length L , for sufficiently large. Steady-state provide further...

The existence of a finite-size effect in one-dimensional oscillator systems causing the energy current power spectrum to saturate constant value at low frequencies is discussed. It shown that mode-coupling theory presented earlier papers can be used predict frequency onset this effect. This by researchers plan simulations with large enough numbers particles avoid presence

The presence of hydrocarbons in interstellar clouds and some emission objects can be inferred from the appearance spectral features near 3.4 μm that are characteristic CH2 CH3 groups. While band attributable to these has been found similar sources such as GC IRS 6E CRL 618 (Chiar et al. 1998), there significant variations relative amplitude individual components other NGC 7538 IRS9 (Allamandola 1992). This indicates composition may depend on ambient conditions clouds. To investigate this...

The definitions of breaks and clusters in a one-dimensional chain equilibrium are discussed. Analytical expressions obtained for the expected cluster length, $\langle K \rangle$, as function temperature pressure Lennard-Jones chain. These compared with results from molecular dynamics simulations. It is found that \rangle$ increases exponentially $\beta = 1/k_BT$ pressure, $P$ agreement previous literature. A method illustrated using \rangle (\beta, P)$ to generate "phase diagram" Some...

Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Geoffrey Lee-Dadswell, Fraser Cunningham Turner; Closing the Feedback Loop with Mastery Tasks. Phys. Teach. 1 September 2023; 61 (6): 528–531. https://doi.org/10.1119/5.0069535 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Dropdown...