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Research Output 1984 2019

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2019
1 Citation (Scopus)

Chirality and bound water in the hierarchical cellulose structure

Paajanen, A., Ceccherini, S., Maloney, T. & Ketoja, J. A., 1 Jul 2019, In : Cellulose. 26, 10, p. 5877-5892 16 p.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
Chirality
Cellulose
Water
Freezing
Natural fibers

Compression strength mechanisms of low-density fibrous materials

Ketoja, J. A., Paunonen, S., Jetsu, P. & Pääkkönen, E., 26 Jan 2019, In : Materials. 12, 3, 384.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
Compaction
Fibers
Imaging techniques
Mechanical testing
Cellulose
2018

Density development in foam forming: Wet pressing dynamics

Järvinen, M., Pihko, R. & Ketoja, J. A., 26 Jul 2018, In : Nordic Pulp and Paper Research Journal. 33, 2, p. 226-236 11 p.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
Pressing (forming)
pressing
foams
foam
Foams
1 Citation (Scopus)

Improving Compression Recovery of Foam-formed Fiber Materials

Paunonen, S., Timofeev, O., Torvinen, K., Turpeinen, T. & Ketoja, J., 2018, In : BioResources. 13, 2, p. 4058-4074 17 p.

Research output: Contribution to journalArticleScientificpeer-review

Open Access
foam
Foams
Compaction
compression
Recovery
4 Citations (Scopus)

Versatile templates from cellulose nanofibrils for photosynthetic microbial biofuel production

Jämsä, M., Kosourov, S., Rissanen, V., Hakalahti, M., Pere, J., Ketoja, J. A., Tammelin, T. & Allahverdiyeva, Y., 14 Apr 2018, In : Journal of Materials Chemistry A: Materials for Energy and Sustainability. 6, 14, p. 5825-5835 11 p.

Research output: Contribution to journalArticleScientificpeer-review

oxidized cellulose
Biofuels
Cellulose
Algae
Hydrogels
2017
3 Citations (Scopus)

Design-driven integrated development of technical and perceptual qualities in foam-formed cellulose fibre materials

Härkäsalmi, T., Lehmonen, J., Itälä, J., Peralta, C., Siljander, S. & Ketoja, J., 2017, In : Cellulose. 24, 11, p. 5053-5068 16 p.

Research output: Contribution to journalArticleScientificpeer-review

Cellulose
Foams
Pulp
Fibers
Textures
2 Citations (Scopus)

Structural properties and foaming of plant cell wall polysaccharide dispersions

Beatrice, C. A. G., Rosa-Sibakov, N., Lille, M., Sözer, N., Poutanen, K. & Ketoja, J. A., 1 Oct 2017, In : Carbohydrate Polymers. 173, p. 508-518 11 p.

Research output: Contribution to journalArticleScientificpeer-review

Polysaccharides
Nanofibers
Dispersions
Structural properties
Xylans
2016
5 Citations (Scopus)

Atomistic molecular dynamics simulations on the interaction of TEMPO-oxidized cellulose nanofibrils in water

Paajanen, A., Sonavane, Y., Ignasiak, D., Ketoja, J. A., Maloney, T. C. & Paavilainen, S., 2016, In : Cellulose. 23, 6, p. 3449-3462

Research output: Contribution to journalArticleScientificpeer-review

oxidized cellulose
Disintegration
Molecular dynamics
Cellulose
Agglomeration
2 Citations (Scopus)
Mineral Oil
Mineral oils
Impurities
Packaging materials
Polyethylene Terephthalates
4 Citations (Scopus)

Porous structure of fibre networks formed by a foaming process: a comparative study of different characterization techniques

Al-Qararah, A. M., Ekman, A., Hjelt, T., Kiiskinen, H., Timonen, J. & Ketoja, J. A., 2016, In : Journal of Microscopy. 264, 1, p. 88-101

Research output: Contribution to journalArticleScientificpeer-review

X-Ray Microtomography
Mercury
Sample Size
Cellulose
Electron Scanning Microscopy
2015
20 Citations (Scopus)

A unique microstructure of the fiber networks deposited from foam-fiber suspensions

Al-Qararah, A. M., Ekman, A., Hjelt, T., Ketoja, J. A., Kiiskinen, H., Koponen, A. & Timonen, J., 2015, In : Colloids and Surfaces A: Physicochemical and Engineering Aspects. 482, p. 544-553

Research output: Contribution to journalArticleScientificpeer-review

foams
Foams
Suspensions
microstructure
Microstructure
10 Citations (Scopus)

Response of wet foam to fibre mixing

Al-Qararah, A. M., Hjelt, T., Koponen, A., Harlin, A. & Ketoja, J., 2015, In : Colloids and Surfaces A: Physicochemical and Engineering Aspects. 467, p. 97-106

Research output: Contribution to journalArticleScientificpeer-review

foams
Foams
fibers
Fibers
bubbles
2014
6 Citations (Scopus)

Drying of Pigment-Cellulose Nanofibril Substrates

Timofeev, O., Torvinen, K., Sievänen, J., Kaljunen, T., Kouko, J. & Ketoja, J., 2014, In : Materials. 7, 10, p. 6893-6907

Research output: Contribution to journalArticleScientificpeer-review

Open Access
Pigments
Cellulose
Drying
Substrates
Hot pressing
2013
24 Citations (Scopus)

Bubble size and air content of wet fibre foams in axial mixing with macro-instabilities

Al.Qararah, A., Hjelt, T., Koponen, A., Harlin, A. & Ketoja, J., 2013, In : Colloids and Surfaces A: Physicochemical and Engineering Aspects. 436, p. 1130-1139 9 p.

Research output: Contribution to journalArticleScientificpeer-review

foams
Macros
Foams
bubbles
fibers
30 Citations (Scopus)

Filler-nanocellulose substrate for printed electronics: Experiments and model approach to structure and conductivity

Penttilä, A., Sievänen, J., Torvinen, K., Ojanperä, K. & Ketoja, J., 2013, In : Cellulose. 20, 3, p. 1413-1424 12 p.

Research output: Contribution to journalArticleScientificpeer-review

Kaolin
Calcium Carbonate
Calcium carbonate
Fillers
Electronic equipment
2012
23 Citations (Scopus)

Exceptional pore size distribution in foam-formed fibre networks

Al-Qararah, A., Hjelt, T., Kinnunen, K., Beletski, N. & Ketoja, J., 2012, In : Nordic Pulp and Paper Research Journal. 27, 2, p. 226-230 4 p.

Research output: Contribution to journalArticleScientificpeer-review

foams
foam
Pore size
bubbles
Foams
17 Citations (Scopus)

Mechanical properties of cellulose nanofibrils determined through atomistic molecular dynamics simulations

Paavilainen, S., McWhirter, J. L., Róg, T., Järvinen, J., Vattulainen, I. & Ketoja, J., 2012, In : Nordic Pulp and Paper Research Journal. 27, 2, p. 282-286 4 p.

Research output: Contribution to journalArticleScientificpeer-review

nanofibers
molecular dynamics
Cellulose
mechanical properties
Molecular dynamics
2010
19 Citations (Scopus)

The role of binder type in determining inkjet print quality

Lamminmäki, T., Kettle, J., Puukko, P., Ketoja, J. & Gane, P., 2010, In : Nordic Pulp and Paper Research Journal. 25, 3, p. 380-390 11 p.

Research output: Contribution to journalArticleScientificpeer-review

Ink
coatings
Binders
coating
styrene
2008
2 Citations (Scopus)

Simulation of triaxial deformation of wet fiber networks

Miettinen, P. P. J. & Ketoja, J. A., 20 Oct 2008, In : Nordic Pulp and Paper Research Journal. 23, 3, p. 264-271 8 p.

Research output: Contribution to journalArticleScientificpeer-review

Fibers
simulation
computer simulation
Poisson ratio
Stress-strain curves
2007
6 Citations (Scopus)

Simulated strength of wet fibre networks

Miettinen, P. P. J., Ketoja, J. A. & Klingenberg, D. J., 1 Oct 2007, In : Journal of Pulp and Paper Science. 33, 4, p. 199-205 7 p.

Research output: Contribution to journalArticleScientificpeer-review

Fibers
Stiffness
Adhesion
Friction
Surface tension
3 Citations (Scopus)

Simulated structure of wet fiber networks

Miettinen, P. P. J., Ketoja, J. A. & Hjelt, T., 1 Dec 2007, In : Nordic Pulp and Paper Research Journal. 22, 4, p. 516-522 7 p.

Research output: Contribution to journalArticleScientificpeer-review

tensile strength
computer simulation
Fibers
Analytical models
Tensile strength
2006

13. Fundamental Research Symposium Cambridgessä

Hjelt, T., Ketoja, J. & Sirviö, J., 2006, In : Paperi ja puu. 88, p. 21-23 2 p.

Research output: Contribution to journalArticleScientific

10 Citations (Scopus)

Theoretical and experimental study on phase transitions and mass fluxes of supersaturated water vapor onto different insoluble flat surfaces

Lauri, A., Riipinen, I., Ketoja, J. A., Vehkamäki, H. & Kulmala, M., 21 Nov 2006, In : Langmuir. 22, 24, p. 10061-10065 5 p.

Research output: Contribution to journalArticleScientificpeer-review

Newsprint
Steam
Water vapor
water vapor
flat surfaces
2002
17 Citations (Scopus)

Diffusion of volatile compounds in fibre networks: Experiments and modelling by random walk simulation

Aurela, B. & Ketoja, J. A., 25 Apr 2002, In : Food Additives and Contaminants. 19, Sup1, p. 56-62 7 p.

Research output: Contribution to journalArticleScientificpeer-review

volatile compounds
Fibers
kraft pulp
product safety
safety assessment
19 Citations (Scopus)

Diffusion through fibre networks

Hellén, E. K. O., Ketoja, J. A., Niskanen, K. J. & Alava, M. J., 1 Feb 2002, In : Journal of Pulp and Paper Science. 28, 2, p. 55-62 8 p.

Research output: Contribution to journalArticleScientificpeer-review

Fibers
Diffusion in gases
Sorption
Fluxes
Porosity
1999
8 Citations (Scopus)

Correlated disorder and propagating modes in the frenkel-kontorova model

Ketoja, J. A. & Satija, I. I., 1 Jan 1999, In : Physical Review B - Condensed Matter and Materials Physics. 59, 14, p. 9174-9184 11 p.

Research output: Contribution to journalArticleScientificpeer-review

Dimers
disorders
dimers
reflected waves
Defects
10 Citations (Scopus)

Heat transfer to paper in a hot nip

Simula, S., Ketoja, J. A. & Niskanen, K., 1 Dec 1999, In : Nordic Pulp and Paper Research Journal. 14, 4, p. 273-278 6 p.

Research output: Contribution to journalArticleScientificpeer-review

heat transfer
Heat transfer
Cooling
cooling
Thermal diffusivity
8 Citations (Scopus)

Localization and fluctuations in quantum kicked rotors

Satija, I. I., Sundaram, B. & Ketoja, J. A., 1 Jan 1999, In : Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics. 60, 1, p. 453-458 6 p.

Research output: Contribution to journalArticleScientificpeer-review

Rotor
rotors
Fluctuations
line shape
Line
1997
6 Citations (Scopus)

"Critical" phonons of the supercritical Frenkel-Kontorova model: Renormalization bifurcation diagrams

Ketoja, J. A. & Satija, I. I., 1 Jan 1997, In : Physica D: Nonlinear Phenomena. 104, 3-4, p. 239-252 14 p.

Research output: Contribution to journalArticleScientificpeer-review

Frenkel-Kontorova Model
Phonons
Bifurcation Diagram
Renormalization
phonons

Fractal characteristics of critical and localized states in incommensurate quantum systems

Satija, I. I. & Ketoja, J. A., 1 Jan 1997, In : Pramana - Journal of Physics. 48, 2, p. 589-601 13 p.

Research output: Contribution to journalArticleScientificpeer-review

fractals
wave functions
electron gas
periodic variations
eigenvectors
57 Citations (Scopus)

Harper equation, the dissipative standard map and strange nonchaotic attractors: Relationship between an eigenvalue problem and iterated maps

Ketoja, J. A. & Satija, I. I., 1 Jan 1997, In : Physica D: Nonlinear Phenomena. 109, 1-2, p. 70-80 11 p.

Research output: Contribution to journalArticleScientificpeer-review

Standard Map
strange attractors
Strange attractor
Eigenvalue Problem
eigenvalues
6 Citations (Scopus)

The re-entrant phase diagram of the generalized Harper equation

Ketoja, J. A. & Satija, I. I., 3 Feb 1997, In : Journal of Physics Condensed Matter. 9, 5, p. 1123-1132 10 p.

Research output: Contribution to journalArticleScientificpeer-review

Phase diagrams
phase diagrams
Ising model
fats
Oils and fats
1995
8 Citations (Scopus)

Decimation studies of Bloch electrons in a magnetic field: Higher-order limit cycles underlying the phase diagram

Ketoja, J. A., Satija, I. I. & Chaves, J. C., 1 Jan 1995, In : Physical Review B. 52, 5, p. 3026-3029 4 p.

Research output: Contribution to journalArticleScientificpeer-review

Wave functions
Phase diagrams
phase diagrams
wave functions
Magnetic fields
1 Citation (Scopus)

Quantum spin chains in aperiodic magnetic fields

Chaves, J. C., Satija, I. I. & Ketoja, J. A., 1 Dec 1995, In : Physica Scripta. 52, 6, p. 614-623 10 p.

Research output: Contribution to journalArticleScientificpeer-review

Quantum Spin Chain
Metal-insulator Transition
Magnetic Field
fats
insulators
10 Citations (Scopus)

Renormalization approach to quasiperiodic quantum spin chains

Ketoja, J. A. & Satija, I. I., 15 Sep 1995, In : Physica A: Statistical Mechanics and its Applications. 219, 1-2, p. 212-233 22 p.

Research output: Contribution to journalArticleScientificpeer-review

Quantum Spin Chain
Renormalization
Spin Chains
Quasiparticles
Natural Frequency
40 Citations (Scopus)

Self-similarity and localization

Ketoja, J. A. & Satija, I. I., 1 Jan 1995, In : Physical Review Letters. 75, 14, p. 2762-2765 4 p.

Research output: Contribution to journalArticleScientificpeer-review

thresholds
eigenvectors
wave functions
interactions
1994
1 Citation (Scopus)

Binary tree approach to scaling in unimodal maps

Ketoja, J. A. & Kurkijärvi, J., 1 May 1994, In : Journal of Statistical Physics. 75, 3-4, p. 643-668 26 p.

Research output: Contribution to journalArticleScientificpeer-review

Unimodal Map
Binary Tree
Scaling
scaling
Geometric Convergence
18 Citations (Scopus)

Renormalization approach to quasiperiodic tight binding models

Ketoja, J. A. & Satij, I. I., 24 Oct 1994, In : Physics Letters A. 194, 1-2, p. 64-70 7 p.

Research output: Contribution to journalArticleScientificpeer-review

fats
fractals
eigenvalues
wave functions
scaling
7 Citations (Scopus)

Rotationally-ordered periodic orbits for multiharmonic area-preserving twist maps

Ketoja, J. A. & MacKay, R. S., 15 Jun 1994, In : Physica D: Nonlinear Phenomena. 73, 4, p. 388-398 11 p.

Research output: Contribution to journalArticleScientificpeer-review

Twist Map
Periodic Orbits
preserving
Orbits
orbits
1992
7 Citations (Scopus)

Renormalisation in a circle map with two inflection points

Ketoja, J. A., 1 Jan 1992, In : Physica D: Nonlinear Phenomena. 55, 1-2, p. 45-68 24 p.

Research output: Contribution to journalArticleScientificpeer-review

Circle Map
Point of inflection
inflection points
Renormalization
Orbits
16 Citations (Scopus)

Universal criterion for the breakup of invariant tori in dissipative systems

Ketoja, J. A., 1 Jan 1992, In : Physical Review Letters. 69, 15, p. 2180-2183 4 p.

Research output: Contribution to journalArticleScientificpeer-review

determinants
chaos
proportion
slopes
1990
7 Citations (Scopus)

Breakup of Kolmogorov-Arnold-Moser tori of arbitrary frequency in a two-parameter system

Ketoja, J. A., 1 Jan 1990, In : Physical Review A. 42, 2, p. 775-780 6 p.

Research output: Contribution to journalArticleScientificpeer-review

cusps
routes
1989
3 Citations (Scopus)

Fibonacci bifurcation sequences and the Cvitanović-Feigenbaum functional equation

Ketoja, J. A. & Piirilä, O. P., 17 Jul 1989, In : Physics Letters A. 138, 9, p. 488-492 5 p.

Research output: Contribution to journalArticleScientificpeer-review

Fibonacci numbers
scaling
infinity
42 Citations (Scopus)

Fractal boundary for the existence of invariant circles for area-preserving maps: Observations and renormalisation explanation

Ketoja, J. A. & MacKay, R. S., 1 Jan 1989, In : Physica D: Nonlinear Phenomena. 35, 3, p. 318-334 17 p.

Research output: Contribution to journalArticleScientificpeer-review

Standard Map
Horseshoe
Cantor set
Breakup
Cusp
1986
5 Citations (Scopus)

Universality of the window structure and the density of aperiodic solutions in dissipative dynamical systems

Ketoja, J. A. & Kurkijarvi, J., 1 Jan 1986, In : Physical Review A. 33, 4, p. 2846-2849 4 p.

Research output: Contribution to journalArticleScientificpeer-review

period doubling
dynamical systems
1984
20 Citations (Scopus)

Instabilities and chaotic solutions of the current biased dc superconducting quantum interference device

Ketoja, J. A., Kurkijärvi, J. & Ritala, R. K., 1 Jan 1984, In : Physical Review B. 30, 7, p. 3757-3764 8 p.

Research output: Contribution to journalArticleScientificpeer-review

SQUIDs
interference
Magnetometers
borders
Chaos theory
5 Citations (Scopus)

Tangential bifurcation and critical indices in a Josephson junction

Ketoja, J. A., Kurkijärvi, J. & Ritala, R. K., 5 Nov 1984, In : Physics Letters A. 105, 8, p. 425-428 4 p.

Research output: Contribution to journalArticleScientificpeer-review

Josephson junctions
scaling
electric potential