Search results for "diffuusio"
showing 10 items of 41 documents
Study of Toner Penetration in Papers by Laser Induced Plasma Spectroscopy and Optical Profilometry
2023
Four major toners are used in the printing industry, cyan, magenta, yellow and black (Key) for making color images on paper. Paper brands suitable for printing have thin mineral/latex coatings, and toners are applied on top of the coating in the printing process. Chemical compositions from toner to toner, as well as from coating to coating, vary according to the needs of the end user. Interactions between the toner and the coating define the final color formation of the images in printing. Hence, it is important to study characteristics and dynamics of toners on coated papers. In this paper, we have used laser-induced plasma spectroscopy (LIBS) to provide information on elemental distributi…
Physical activity, aerobic fitness, and brain white matter : Their role for executive functions in adolescence
2020
Highlights • Aerobic fitness level, but not physical activity, is related to white matter properties in the brain. • The relation between physical activity and working memory is moderated by fractional anisotropy (FA) of the corpus callosum. • The FA of the corpus callosum and superior corona radiata moderates the relation between aerobic fitness and working memory.
Three-dimensional architecture of the whole human soleus muscle in vivo
2018
Background Most data on the architecture of the human soleus muscle have been obtained from cadaveric dissection or two-dimensional ultrasound imaging. We present the first comprehensive, quantitative study on the three-dimensional anatomy of the human soleus muscle in vivo using diffusion tensor imaging (DTI) techniques. Methods We report three-dimensional fascicle lengths, pennation angles, fascicle curvatures, physiological cross-sectional areas and volumes in four compartments of the soleus at ankle joint angles of 69 ± 12° (plantarflexion, short muscle length; average ± SD across subjects) and 108 ± 7° (dorsiflexion, long muscle length) of six healthy young adults. Microdissection and…
The Effects of Digitalisation on Accounting Service Companies
2019
Rapidly expanding digitalisation profoundly affects several jobs and businesses in the following years. Some of the jobs are expected to disappear altogether. The expanding digitalisation can be seen as an example of the diffusion of innovations. The world has witnessed similar developments since the early years of industrialisation. Some of the sectors that will face the most disruptive changes are accounting, bookkeeping, and auditing. As much as 94 to 98 per cent of these jobs are at risk. The purpose of this study was to find out how digitalisation, automation of routines, robotics, and artificial intelligence are expected to affect the business structure, organisations, tasks, and empl…
Anomaly Detection from Network Logs Using Diffusion Maps
2011
The goal of this study is to detect anomalous queries from network logs using a dimensionality reduction framework. The fequencies of 2-grams in queries are extracted to a feature matrix. Dimensionality reduction is done by applying diffusion maps. The method is adaptive and thus does not need training before analysis. We tested the method with data that includes normal and intrusive traffic to a web server. This approach finds all intrusions in the dataset. peerReviewed
On the a posteriori error analysis for linear Fokker-Planck models in convection-dominated diffusion problems
2018
This work is aimed at the derivation of reliable and efficient a posteriori error estimates for convection-dominated diffusion problems motivated by a linear Fokker-Planck problem appearing in computational neuroscience. We obtain computable error bounds of the functional type for the static and time-dependent case and for different boundary conditions (mixed and pure Neumann boundary conditions). Finally, we present a set of various numerical examples including discussions on mesh adaptivity and space-time discretisation. The numerical results confirm the reliability and efficiency of the error estimates derived.
Current state and future perspectives of biochar applications in Finland
2018
Kiinnostus biohiiltä kohtaan lisääntyy jatkuvasti, sillä biohiili tarjoaa taloudellisia ja ympäristön kannalta kestäviä ratkaisuja. Biohiiltä on tutkittu Suomessa noin kymmenen vuotta, mutta vasta viime aikoina sen taloudellinen kannattavuus on tunnistettu. Aikaisemmat biohiileen liittyvät tutkimukset ovat keskittyneet lähinnä pyrolyysiprosessiin, biohiilen ominaisuuksiin sekä biohiilen potentiaalisten käyttökohteiden tutkimiseen. Biohiilen markkinatilannetta ei ole vielä Suomessa tutkittu, lukuun ottamatta biohiilen käyttöä energiantuotannossa (biohiilen poltto), mikä on kuitenkin rajattu tästä tutkimuksesta. Tämän työn tarkoitus on tutkia biohiilen käytön nykyistä tilannetta ja sen tuleva…
Computational modeling of protein diffusion in the cell nucleus using the lattice-Boltzmann method
2012
The number of fluorescence applications and methods of analysis is growing in the biological and related sciences. The aim of this work was to accurately determine the diffusion coefficient in nucleus, diffusion in the cytoplasm and nucleo-cytoplasmic translocation should be considered as well. Fluorescence recovery after photobleaching (FRAP) experiments were used in order to study protein diffusion. A numerical model for FRAP was used to determine the diffusion properties of proteins. The present method removed the difficulties of the conventional analysis, could produce, interesting results for protein diffusion in the cell.
Energiayhtiön sähköinen asiointi
2012
Energia-alalla on ryhdytty kehittämään sähköisiä asiointipalveluita. Sähköisten palveluiden kehitys on useimmilla yhtiöillä vielä alkutekijöissään eikä aiheeseen liittyvää tutkimusta ole juurikaan tehty. Näitä lähtökohtia silmälläpitäen tällä tutkimuksella pyritään selvittämään eräitä sähköisten palveluiden kehittämisen kannalta keskeisiä kysymyksiä. Kysymykset liittyvät kuluttajien halukkuuteen käyttää sähköisiä palveluita ja voivatko sähköiset kanavat korvata nykyisiä palvelumuotoja. Lisäksi vastaajilta kysyttiin mitä palveluita kuluttajat haluavat käyttöönsä. Tutkielmassa käsitellään innovaation eli sähköisten asiointipalveluiden leviämistä Rogersin innovaation diffuusioteorian näkökulma…