Search results for "kuvaus"
showing 10 items of 201 documents
Sensory Organ Investment Varies with Body Size and Sex in the Butterfly Pieris napi
2021
Simple Summary Pollinating insects rely on a range of senses such as vision, olfaction, gustation, and mechanosensation to utilise, locate, and fly between floral resources. The size of different sensory organs determines their sensitivity and provides an indication of their relative importance—larger organs can enhance sensitivity by increasing the number or size of sensing structures. However, increasing the relative size of an organ would require additional energy for developing and maintaining it. This likely leads to a trade-off between the energy invested into different sensory systems within individuals. To explore how the size of the sensory organs vary with body size in insect poll…
Elektronisen liiketoiminnan XML-määritykset
2002
Hyperspectral Imaging of Macroinvertebrates : a Pilot Study for Detecting Metal Contamination in Aquatic Ecosystems
2018
The applicability of spectral analysis in detection of freshwater metal contamination was assessed by developing and testing a novel hyperspectral imaging (HSI) application for aquatic insect larvae (Trichoptera: Hydropsychidae). Larvae were first exposed to four different cadmium (Cd) concentrations: 0, 1, 10, and 100 μg L−1 for 96 h. Individual larvae were then preserved in ethanol, inspected with microscopy for the number of anomalies in larval gills, and imaged by hyperspectral camera operating with wavebands between 500 and 850 nm. Three additional larvae from each exposure were analyzed for tissue Cd concentration. Although the larval tissue Cd concentrations correlated positively wit…
Complexity and Resilience
2021
Spatial source phase : A new feature for identifying spatial differences based on complex-valued resting-state fMRI data
2019
Spatial source phase, the phase information of spatial maps extracted from functional magnetic resonance imaging (fMRI) data by data‐driven methods such as independent component analysis (ICA), has rarely been studied. While the observed phase has been shown to convey unique brain information, the role of spatial source phase in representing the intrinsic activity of the brain is yet not clear. This study explores the spatial source phase for identifying spatial differences between patients with schizophrenia (SZs) and healthy controls (HCs) using complex‐valued resting‐state fMRI data from 82 individuals. ICA is first applied to preprocess fMRI data, and post‐ICA phase de‐ambiguity and den…
A method for measuring wetting and swelling of bentonite using X-ray imaging
2022
A non-invasive method based on X-ray imaging for measuring deformation and water transport in wetting and swelling bentonite samples is introduced. Sequential X-ray images taken of the samples were used to calculate the attenuation coefficient and deformation. These results, together with careful calibration, allowed finding the dry density and water content distributions and their temporal evolution in the wetting and swelling samples. A specific correction technique, based on regularly taking reference X-ray images of aluminum plates of varying thickness, was developed and used to take into account X-ray beam instabilities and thus to improve the accuracy of density analysis. Large deform…
Voimaharjoittelun vaikutukset keskimmäisen ja suoran reisilihaksen väliseen dynamiikkaan polven koukistus-ojennusliikkeessä
2014
Tässä tutkimuksessa tarkastellaan nopeuskoodatun magneettikuvauksen avulla voimaharjoittelun vaikutuksia nelipäisen reisilihaksen mekaniikkaan. Tutkimukseen osallistui 14 koehenkilöä, joista seitsemän voimaharjoitteli 20 viikon ajan. Yhden toiston maksimitulos jalkakyykyssä parani koeryhmällä (33,1 ± 12,1) % ja vertailuryhmällä (6,6 ± 5,1) %. Molemmat tulokset olivat tilastollisesti merkitseviä (koeryhmä 𝑝 < 0.001, vertailuryhmä 𝑝 < 0.05). Ryhmän ja ajan yhteisvaikutus oli merkitsevä (𝑝 < 0.001). Voimaharjoittelujaksoa ennen ja sen jälkeen koehenkilöt tekivät pienellä kuormalla toistuvaa polven ojennus-koukistusliikettä magneettikuvauslaitteessa. Suoran reisilihaksen ja keskimmäisen reis…
Comparison of Machine Learning Methods in Stochastic Skin Optical Model Inversion
2020
In this study, we compare six different machine learning methods in the inversion of a stochastic model for light propagation in layered media, and use the inverse models to estimate four parameters of the skin from the simulated data: melanin concentration, hemoglobin volume fraction, and thicknesses of epidermis and dermis. The aim of this study is to determine the best methods for stochastic model inversion in order to improve current methods in skin related cancer diagnostics and in the future develop a non-invasive way to measure the physical parameters of the skin based partially on the results of the study. Of the compared methods, which are convolutional neural network, multi-layer …
Epävakaa mimeettinen halu Robert Walserin romaanissa Konttoristi
2019
Artikkelissa tutkitaan sveitsiläisen kirjailijan Robert Walserin romaania Konttoristi René Girardin esittämän mimeettisen halun teorian, kaunasta virittyvän syntipukkimekanismin ja myös niistä erillisen mimetismin näkökulmista. Girardin teoriaan luodun katsauksen jälkeen eritellään konttoristina työskentelevän päähenkilön asemaa taloudellisen ja sosiaalisen kilpailun piirissä. Toisin kuin Girardin omissa analyyseissa, päähenkilö on pikemmin mimeettisen halun epävarma ja välillä vastahankainen tukija ja kosketuspinta kuin sen vallassa oleva toimija. Lisäksi käsitellään Walserin kertomatavan vaikutuksia sekä tarinan että kilpailevasta jäljittelystä poikkeavien imaginaaristen vastaavuuksien ta…
Spatio-temporal Dynamical Analysis of Brain Activity during Mental Fatigue Process
2021
Mental fatigue is a common phenomenon with implicit and multidimensional properties. It brings dynamic changes of functional brain networks. However, the challenging problem of false positives appears when the connectivity is estimated by Electroencephalography (EEG). In this paper, we propose a novel framework based on spatial clustering to explore the sources of mental fatigue and functional activity changes caused by them. To suppress the false positive observations, spatial clustering is implemented in brain networks. The nodes extracted by spatial clustering are registered back to functional magnetic resonance imaging (fMRI) source space to determined the sources of mental fatigue. The…