Publications (17)
Comment on "Universal Distribution of Interearthquake Times"
J. Astrom, P. C. F. Di Stefano, F. Probst +2
We note the striking similarity between earthquake and CRESST microfracture data for waiting times.
Effect of a columnar defect on the shape of slow-combustion fronts
M. Myllys, J. Maunuksela, J. Merikoski +4
We report experimental results for the behavior of slow-combustion fronts in the presence of a columnar defect with excess or reduced driving, and compare them with those of mean-f…
Fracture Processes Observed with A Cryogenic Detector
J. Astrom, P. C. F. Di Stefano, F. Proebst +15
In the early stages of running of the CRESST dark matter search using sapphire detectors at very low temperature, an unexpectedly high rate of signal pulses appeared. Their origin…
Scaling of many-particle correlations in a dissipative sandpile
N. M. Bogoliubov, A. G. Pronko, J. Timonen
The two dimensional directed sandpile with dissipation is transformed into a (1+1) dimensional problem with discrete space and continuous `time'. The master equation for the condit…
Twisting Graphene Nanoribbons into Carbon Nanotubes
O. O. Kit, T. Tallinen, L. Mahadevan +2
Although carbon nanotubes consist of honeycomb carbon, they have never been fabricated from graphene directly. Here, it is shown by quantum molecular-dynamics simulations and class…
Roughening of the Cu(110) Surface
J. Merikoski, H. Hakkinen, M. Manninen +2
The structure of the Cu(110) surface is studied at high temperatures using a combination of lattice-gas Monte Carlo and molecular dynamics methods with identical many-atom interact…
Crumpling of a stiff tethered membrane
J. A. Astrom, J. Timonen, Mikko Karttunen
first-principles numerical simulation model for crumpling of a stiff tethered membrane is introduced. In our model membranes, wrinkles, ridge formation, ridge collapse, as well as…
Kinetic Roughening in Slow Combustion of Paper
M. Myllys, J. Maunuksela, M. Alava +3
Results of experiments on the dynamics and kinetic roughening of one-dimensional slow-combustion fronts in three grades of paper are reported. Extensive averaging of the data allow…
Impalement transitions in droplets impacting microstructured superhydrophobic surfaces
J. Hyväluoma, J. Timonen
Liquid droplets impacting a superhydrophobic surface decorated with micro-scale posts often bounce off the surface. However, by decreasing the impact velocity droplets may land on…
Coherent quantum oscillations in coupled traps with ultracold atoms
N. M. Bogoliubov, J. Timonen, M. B. Zvonarev
The dynamics of two traps with ultracold atoms and connected by Josephson type coupling, is shown to exhibit a transition from dispersive dynamics to localized coherent oscillation…
Lattice-Boltzmann and finite-difference simulations for the permeability for three-dimensional porous media
C. Manwart, U. Aaltosalmi, A. Koponen +2
Numerical micropermeametry is performed on three dimensional porous samples having a linear size of approximately 3 mm and a resolution of 7.5 m. One of the samples is a microt…
Temporal and spatial persistence of combustion fronts
J. Merikoski, J. Maunuksela, M. Myllys +2
The spatial and temporal persistence, or first-return distributions are measured for slow combustion fronts in paper. The stationary temporal and (perhaps less convincingly) spatia…
Singularity Formation and Collapse in the Attractive Gross-Pitaevskii Equation
A. V. Rybin, G. G. Varzugin, J. Timonen
A generic mechanism of collapse in the Gross-Pitaevskii equation with attractive interparticle interactions is gained by reformulating this equation as Newton's equation of motion…
Finite-temperature correlations in the one-dimensional trapped and untrapped Bose gases
N. M. Bogoliubov, R. K. Bullough, C. Malyshev +1
We calculate the dynamic single-particle and many-particle correlation functions at non-zero temperature in one-dimensional trapped repulsive Bose gases. The decay for increasing d…
Singularity formation in the Gross-Pitaevskii Equation and Collapse in BEC
A. V. Rybin, I. P. Vadeiko, G. G. Varzugin +1
We study a mechanism of collapse of the condensate wave function in the Gross-Pitaevskii theory with attractive interparticle interaction. We reformulate the Gross-Pitaevskii equat…
Brittle fracture down to femto-Joules - and below
J. Astrom, P. Di Stefano, F. Proebst +2
We analyze large sets of energy-release data created by stress-induced brittle fracture in a pure sapphire crystal at close to zero temperature where stochastic fluctuations are mi…
Finite-temperature correlations in the trapped Bose gas
N. M. Bogoliubov, R. K. Bullough, V. S. Kapitonov +2
Previous functional integral methods for translationally invariant systems have been extended to the case of a confining trap potential. Essentially all finite-temperature properti…