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- R. P. Linna, J. A. Ã…strÃ¶m, Jussi Timonen
- Physical review. E, Statistical, nonlinear, andâ€¦
- 2005

It has been shown previously that dynamic fragmentation of brittle D -dimensional objects in a D -dimensional space gives rise to a power-law contribution to the fragment-size distribution with a universal scaling exponent 2-1/D . We demonstrate that in fragmentation of two-dimensional brittle objects in three-dimensional space, an additional fragmentationâ€¦ (More)

- R. P. Linna, Jaakko Moisio, Pirkko Suhonen, K. Kaski
- Physical review. E, Statistical, nonlinear, andâ€¦
- 2014

Polymer ejection from a capsid through a nanoscale pore is an important biological process with relevance to modern biotechnology. Here, we study generic capsid ejection using Langevin dynamics. We show that even when the ejection takes place within the drift-dominated region there is a very high probability for the ejection process not to be completed.â€¦ (More)

- J. A. Ã…strÃ¶m, Finn Ouchterlony, R. P. Linna, Jussi Timonen
- Physical review letters
- 2004

A generic model is introduced for brittle fragmentation in D dimensions, and this model is shown to lead to a fragment-size distribution with two distinct components. In the small fragment-size limit a scale-invariant size distribution results from a crack branching-merging process. At larger sizes the distribution becomes exponential as a result of aâ€¦ (More)

- J. A. Ã…strÃ¶m, R. P. Linna, Jussi Timonen, Peder Friis MÃ¸ller, Lene B. Oddershede
- Physical review. E, Statistical, nonlinear, andâ€¦
- 2004

Generic arguments, a minimal numerical model, and fragmentation experiments with gypsum disk are used to investigate the fragment-size distribution that results from dynamic brittle fragmentation. Fragmentation is initiated by random nucleation of cracks due to material inhomogeneities, and its dynamics are pictured as a process of propagating cracks thatâ€¦ (More)

- R. P. Linna, K. Kaski
- Physical review letters
- 2008

With a model that incorporates hydrodynamics directly, we show that flow experiments can be used for detecting some characteristics of the DNA elasticity which manifest themselves clearly at large length scales but cannot be observed by mechanical forcing experiments even at very small length scales. By systematic analysis, the conclusiveness of differentâ€¦ (More)

- Ville V. Lehtola, R. P. Linna, K. Kaski
- Physical review. E, Statistical, nonlinear, andâ€¦
- 2008

In forced polymer translocation, the average translocation time tau scales with respect to pore force f and polymer length N as tau approximately f;{-1}N;{beta} . We demonstrate that an artifact in the Metropolis Monte Carlo method resulting in breakage of the force scaling with large f may be responsible for some of the controversies between differentâ€¦ (More)

- Kimmo SÃ¤Ã¤skilahti, Jani Oksanen, R. P. Linna, Jukka Tulkki
- Physical review. E, Statistical, nonlinear, andâ€¦
- 2012

We perform classical nonequilibrium molecular dynamics simulations to calculate heat flow through a microscopic junction connecting two larger reservoirs. In contrast to earlier papers, we also include the reservoirs in the simulated region to study the effect of the bulk-nanostructure interfaces and the bulk conductance. The scalar Fermi-Pasta-Ulam (FPU)â€¦ (More)

- Ville V. Lehtola, R. P. Linna, K. Kaski
- Physical review. E, Statistical, nonlinear, andâ€¦
- 2010

We present results for unforced polymer translocation from simulations using Langevin dynamics in two dimensions (2D) to four dimensions and stochastic rotation dynamics supporting hydrodynamic modes in three dimensions (3D). We compare our results to forced translocation and a simplified model where the polymer escapes from an infinite pore. The simpleâ€¦ (More)

A macro model for a superconducting microstrip line, including dielectric losses and dispersion due to the frequency dependence of the microstrip effective permittivity, is implemented in the circuit simulator and design tool APLAC. A few fundamental principles of superconductivity are first reviewed so as to fathom the significance of some of theâ€¦ (More)

- R. P. Linna
- 2010

We present a numerical study of forced polymer translocation by using two separate pore models. Both of them have been extensively used in previous forced translocation studies. We show that variations in the pore model affect the forced translocation characteristics significantly in the biologically relevant pore force, i.e. driving force, range. Detailsâ€¦ (More)