Browsing Research publications by Faculty "Luonnontieteiden ja ympäristötekniikan tiedekunta – Faculty of Science and Environmental Engineering"

Now showing items 1-20 of 58

An Adaptive Derivative Free Method for Bayesian Posterior Approximation

Raitoharju, Matti; Ali-Löytty, Simo (2012)

In the Gaussian mixture approach a Bayesian posterior probability distribution function is approximated using a weighted sum of Gaussians. This work presents a novel method for generating a Gaussian mixture by splitting ...
Approaches to linking biomolecular simulations and computational systems biology

Cramariuc, Oana; Cramariuc, Bogdan (2011-06-26)

The activity within a living cell is based on a complex network of interactions among biomolecules exchanging information and energy through various, often interconnecting, pathways involving bio-chemical and bio-physical ...
Autonomous satellite orbit prediction

Seppänen, Mari (2011)

A method to predict satellite orbits in a GPS device without a network connection is presented. The motivation for this work was to improve the startup performance of a navigation device without Assisted GPS. Tests of our ...
Boundary element method for surface nonlinear optics of nanoparticles

Mäkitalo, Jouni; Suuriniemi, Saku; Kauranen, Martti (2011)

We present the frequency-domain boundary element formulation for solving surface second-harmonic generation from nanoparticles of virtually arbitrary shape and material. We use the Rao-Wilton-Glisson basis functions and ...
Calculation of the electrostatic potential of lipid bilayers from molecular dynamics simulations: Methodological issues

Gurtovenko, Andrey A.; Vattulainen, Ilpo (2009)

The electrostatic properties of lipid membranes are of profound importance as they are directly associated with membrane potential and, consequently, with numerous membrane-mediated biological phenomena. Here we address a ...
Calibration of the second-order nonlinear optical susceptibility of surface and bulk of glass

Rodriquez, Francisco J.; Wang, Fu Xiang; Kauranen, Martti (2008)

A two-beam second-harmonic generation technique is developed to calibrate the magnitude of the second-order nonlinear optical susceptibility components of surface and bulk (multipolar origin) of isotropic materials. The ...
Catalysing the development of a conference workspace

Huhtamäki, Jukka; Nykänen, Ossi; Salonen, Jaakko (2009)

Modern Web introduces new means to support conference information retrieval and, moreover, social tools that enable conference delegates to actively contribute to a conference. Simultaneously, existing case studies show ...
Chiral coupling in gold nanodimers

Husu, Hannu; Canfield, Brian K.; Laukkanen, Janne; Bai, Benfeng; Kuittinen, Markku; Turunen, Jari; Kauranen, Martti (2008)

Second-harmonic generation from T-shaped gold nanodimers with nanogaps has different efficiencies for left- and right-hand circularly polarized fundamental light. The difference arises from the chiral symmetry breaking of ...
Cholesterol induces specific spatial and orientational order in cholesterol/phospholipid membranes

Martinez-Seara, Hector; Rog, Tomasz; Karttunen, Mikko; Vattulainen, Ilpo; Reigada, Ramon (2010)

Background: In lipid bilayers, cholesterol facilitates the formation of the liquid-ordered phase and enables the formation of laterally ordered structures such as lipid rafts. While these domains have an important role in ...
Colouring glazed ceramic tiles with Liquid Flame Spray generated nanoparticles

Haapanen, Janne; Aromaa, Mikko; Fröberg, Linda; Piispanen, Minna; Hupa, Leena; Siikamäki, Raija; Mäkelä, Jyrki M. (2011)
Comparison of cholesterol and its direct precursors along the biosynthetic pathway: Effects of cholesterol, desmosterol and 7-dehydrocholesterol on saturated and unsaturated lipid bilayers

Rog, Tomasz; Vattulainen, Ilpo; Jansen, Maurice; Ikonen, Elina; Karttunen, Mikko (2008)

Despite extensive studies, the remarkable structure-function relationship of cholesterol in cellular membranes has remained rather elusive. This is exemplified by the fact that the membrane properties of cholesterol are ...
Conformational changes and slow dynamics through microsecond polarized atomistic molecular simulation of an integral Kv1.2 ion channel

Bjelkmar, Pär; Niemelä, Perttu S.; Vattulainen, Ilpo; Lindahl, Erik (2009)

Structure and dynamics of voltage-gated ion channels, in particular the motion of the S4 helix, is a highly interesting and hotly debated topic in current membrane protein research. It has critical implications for insertion ...
Context-Driven Social Network Visualisation: Case Wiki Co-Creation

Huhtamäki, Jukka; Salonen, Jaakko; Marttila, Jarno; Nykänen, Ossi (2010)

Along social media and Web 2.0, the amount of data sources potentially available for social network visualisation has snowballed. Recent development on information visualisation technologies contribute to the availability ...
Different chromophore concentration dependence of photoinduced birefringenge and second-order susceptibility in all-optical poling

Virkki, Matti; Kauranen, Martti; Priimagi, Arri (2011)

We study photoinduced axial and polar ordering in Disperse Red 1 azobenzene–poly(4-vinylpyridine) polymer systems by monitoring both birefringence and second-harmonic generation during all-optical poling. The two responses ...
Dipole limit in second-harmonic generation from arrays of gold nanoparticles

Czaplicki, Robert; Zdanowicz, Mariusz; Koskinen, Kalle; Laukkanen, Janne; Kuittinen, Markku; Kauranen, Martti (2012)

We present a multipolar tensor analysis of second-harmonic generation from arrays of noncentrosymmetric gold nanoparticles. In contrast to earlier results, where higher multipoles and symmetry-forbidden signals arising ...
Effective medium multipolar tensor analysis of second-harmonic generation from metal nanoparticles

Zdanowicz, Mariusz; Kujala, Sami; Husu, Hannu; Kauranen, Martti (2011)

We present a detailed multipolar tensor analysis of second-harmonic (SH) generation from arrays of L-shaped gold nanoparticles. We define three effective nonlinear tensors, which include electric dipoles only (Aeee) and ...
The effect of nanoparticles on properties of glossy glazed surfaces

Piispanen, Minna; Fröberg, Linda; Haapanen, Janne; Aromaa, Mikko; Mäkelä, Jyrki M.; Siikamäki, Raija; Hupa, Leena (2011)
Efficient second-harmonic generation in silicon nitride resonant waveguide gratings

Ning, Tingyin; Pietarinen, Henna; Hyvärinen, Outi; Kumar, Ravi; Kaplas, Tommi; Kauranen, Martti; Genty, Goery (2012-10)

We demonstrate a thousand-fold enhancement of second-harmonic generation in an all-dielectric silicon nitride (SiN) resonant waveguide grating compared to a flat SiN film. The strong second-harmonic output measured at 532 ...
Electromechanical films as a photoacoustic transducer

Manninen, Albert; Sand, Johan; Saarela, Jaakko; Sorvajärvi, Tapio; Toivonen, Juha; Hernberg, Rolf (2009)

An electromechanical film, EMFi, is utilized as a transducer in a photoacoustic (PA) gas sensor. The film is a sensitive acoustic transducer, it is easily formable, and it exhibits a wide frequency response regardless of ...
End-user attitudes towards location-based services and future mobile wireless devices: The students’ perspective

Lohan, Elena-Simona; Rusu-Casandra, Alexandru; Cramariuc, Oana; Marghescu, Ion; Cramariuc, Bogdan (2011-07-18)

Nowadays, location-enabled mobile phones are becoming more and more widespread. Various players in the mobile business forecast that, in the future, a significant part of total wireless revenue will come from Location-Based ...

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Browsing Research publications by Faculty "Luonnontieteiden ja ympäristötekniikan tiedekunta – Faculty of Science and Environmental Engineering"

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