Search results for "korrelaatio"

Puukuitususpension putkistovirtaus, viskositeetti ja häviökorrelaatiomalli

2010

We measured pressure loss and velocity profile from pine and birch suspension flow in two straight PVC-tubes. The suspension consistencies were 0,5 %–4,0 % and tubes' radius were 105,2 mm and 191,6 mm. The velocity profiles were measured with pulsed ultrasonic Doppler velocimetry technique. Unusual laminar shaped profiles were discovered at low flow rates of birch suspension. With these profiles it was possible to calculate the actual viscosity for fiber suspension. In the analysis we discovered that the viscosity didn't depend on the flow velocity or geometry. It was possible to write a material law that describes the viscosity as a function of shear rate with two material related paramete…

Developments in many-body theory of quantum transport and spectroscopy with non-equilibrium Green's functions and time-dependent density functional t…

2015

The problem of quantum dynamics in open systems has gained attention in recent decades and not the least due to the advances made in quantum transport in molecular systems. The main motivation behind quantum transport and molecular electronics is the futuristic goal to be able at some point to replace, or to complement, the silicon-based technology and to make the electronic devices faster. On a fundamental level, one has to deal with time-dependent processes where electron-electron or electron- phonon interactions are of great importance, and they can cause profound quantitative and qualitative changes on the physical and dynamical properties of electronic systems compared to the non-inter…

Vuorovaikuttavien satunnaiskävelijöiden autokorrelaatiot ja rajapintojen leveys

2008

Äidin ja opettajan välinen luottamus sekä äidin masennusoireiden yhteys luottamukseen

2017

Tutkimuksessa tarkasteltiin äitien ja esiopettajien sekä äitien ja ensimmäisen luokan opettajien luottamusta toisiinsa. Tutkimuksessa selvitettiin myös ovatko äidin masennusoireet ovat yhteydessä luottamukseen opettajaa kohtaan. Lisäksi tutkittiin äitien ja opettajien luottamuksen yhteyksiä sekä sitä, selittävätkö taustatekijät (äidin koulutustaso, perhemuoto ja lapsen asema sisarussarjassa), äidin masennusoireiden ja opettajien tekemän arvion yhteyttä. Tutkimus on osa Alkuportaat -seurantatutkimusta. Aineisto kerättiin kyselylomakkeilla äideiltä, esiopettajilta ja ensimmäisen luokan opettajilta. Äidit vastasivat kyselyyn lapsensa ollessa esiopetuksessa sekä uudelleen ensimmäi-sellä luokall…

A checklist to assess the quality of survey studies in psychology

2020

Abstract Study quality is emerging as an essential component of evidence syntheses. It allows practitioners and policymakers to make informed decisions based on the quality of the evidence reviewed. Study quality is typically assessed by checklists of pre-determined quality criteria. Few study quality checklists have been systematically evaluated, and none have been developed specifically for survey studies in psychology. The present study addresses this evidence gap by developing the quality of survey studies in psychology (Q-SSP) checklistusing an expert-consensus method. An international panel of experts in psychology research and quality assessment (N = 53) evaluated the inclusion and i…

The relationship between electrophysiological and hemodynamic measures of neural activity varies across picture naming tasks: A multimodal magnetoenc…

2022

Funding Information: This work was financially supported by the Academy of Finland (Finnish Center of Excellence in Computational Inference Research COIN and grants #292334, #294238 to SK; #255349, #315553 to RS; #257576 to JK; #286405 funding for TM), the Sigrid Jusélius Foundation (grant to RS), the Finnish Cultural Foundation (grant to ML), the Swedish Cultural Foundation in Finland (grant to ML), the Maud Kuistila Memorial Foundation (grant to ML), and Aalto Brain Center. Publisher Copyright: Copyright © 2022 Mononen, Kujala, Liljeström, Leppäaho, Kaski and Salmelin. Different neuroimaging methods can yield different views of task-dependent neural engagement. Studies examining the relat…

Can number and size of offspring increase simultaneously? – A central life-history trade-off reconsidered

2012

Background: To maximize their fitness, parents are assumed to allocate their resources optimally between number and size of offspring. Although this fundamental life-history trade-off has been subject to long standing interest, its genetic basis, especially in wild mammals, still remains unresolved. One important reason for this problem is that a large multigenerational pedigree is required to conduct a reliable analysis of this trade-off. Results: We used the REML-animal model to estimate genetic parameters for litter size and individual birth size for a common Palearctic small mammal, the bank vole (Myodes glareolus). Even though a phenotypic trade-off between offspring number and size wa…

Acoustic, neural, and perceptual correlates of polyphonic timbre

2012

Maataloustuotemarkkinoiden sijoittajakäyttäytymisen muutoksen vaikutus USA:n maataloustuote- ja osakemarkkinoiden korreloituneisuuteen

2017

Tässä tutkimuksessa perehdytään siihen, kuinka maataloustuotemarkkinoiden sijoittajakäyttäytymisen muutos vaikuttaa osake- ja maataloustuotemarkkinoiden väliseen korrelaatioon. Tutkittava aineisto koostuu maissin, vehnän, soijapavun, sokerin ja kaakaon päivittäisistä futuurihinnoista vuosilta 1973–2016. Tutkimuksessa osakemarkkinoita kuvaa S&P 500 -indeksi ja raaka-ainemarkkinoita S&P GSCI -indeksi. Aluksi arvioidaan muuttujien keskinäisiä riippuvuussuhteita VAR-mallin avulla. Tämän jälkeen estimoidaan osake- ja maataloustuotemarkkinoiden volatiliteetit ja korrelaatiot DCC-GARCH -mallin avulla sekä arvioidaan muuttujien volatiliteettien ja korrelaatioiden muutosta kahden otoksen t-testin av…

Evolutionary trade-offs in a small mammal : a quantitative genetics approach

2017

Limited resources force individuals to trade-off between life-history traits. A vast diversity of life-history strategies, which optimally combine life history traits, can be found. Knowledge of the genetic basis of this phenotypic variation is key to understanding evolutionary processes. I approached life-history evolution by estimating quantitative genetic parameters for a set of life-history traits in the bank vole (Myodes glareolus). The work is based on a laboratory-kept colony subjected to two-way selection for litter size (High- (H) and Low- (L) lines). Costs of the created reproductive strategies were observed in natural conditions. Selection increased the difference in litter size …