Search results for "FINE"
showing 10 items of 1800 documents
Physicochemical investigation of surfactant-coated gold nanoparticles synthesized in the confined space of dry reversed micelles
2006
Abstract Gold nanoparticle/surfactant composites have been synthesized by a novel reduction reaction in the confined space of dry sodium bis(2- ethylhexyl)sulfosuccinate (AOT) or lecithin reversed micelles dispersed in n-heptane and cyclohexane, respectively. The reaction was carried out by adding an opportune amount of anhydrous hydrazine/tetrahydrofuran solution to a suspension of HAuCl4-containing dry reversed micelles dispersed in organic solvent. UV–vis investigation ascertained the formation of stable metal gold nanoparticles and the analysis of FT-IR spectra highlighted the formation of an oriented surfactant monolayer at the nanoparticle surface. Simple evaporation under vacuum of t…
Isäntäkalan altistushistorian vaikutus Diplostomum pseudospathaceum -loisen tartuntamenestykseen ja genotyyppien välisiin vuorovaikutussuhteisiin
2016
Luonnossa isännät altistuvat usein monille loislajeille sekä niiden genotyypeille. Altistuminen tapahtuu usein eri aikaan johtuen loisinnan ajallisesta ja paikallisesta vaihtelusta, minkä seurauksena loisia vastaan kehittyvät immuunivasteet syntyvät vaiheittaisesti. Loiset voivat vaikuttaa toisiinsa suoraan kilpailemalla elintilasta tai resursseista, tai epäsuorasti isännän immuunijärjestelmän kautta. Kahden loisgenotyypin yhtäaikaisen tartunnan on aiemmissa tutkimuksissa havaittu kuormittavan isännän immuunijärjestelmää niin, että kummankin genotyypin tartuntamenestys on tällöin korkeampi. Tutkielmassani selvitin, miten isännän altistushistoria vaikuttaa loisten välisiin vuorovaikutussuhte…
Robustifying principal component analysis with spatial sign vectors
2012
In this paper, we apply orthogonally equivariant spatial sign covariance matrices as well as their affine equivariant counterparts in principal component analysis. The influence functions and asymptotic covariance matrices of eigenvectors based on robust covariance estimators are derived in order to compare the robustness and efficiency properties. We show in particular that the estimators that use pairwise differences of the observed data have very good efficiency properties, providing practical robust alternatives to classical sample covariance matrix based methods. peerReviewed
"Samanarvoisia tiskin molemmin puolin" : etnografinen tutkimus ruoka-avun vapaaehtoistyöstä
2017
Tämä tutkimus käsittelee vapaaehtoistyötä suomalaisessa ruoka-avussa. Tarkoituksena on luoda kuvaa siitä, ketkä vapaaehtoistyötä tekevät ja miksi. Kiinnostuksen kohteena ovat erityisesti vapaaehtoisten motivaatiotekijät. Tutkimus keskittyy vapaaehtoisten kokemuksiin ruohonjuuritasolla ja lähtökohtana on ruoka-avun arjen jäsentyminen. Tutkimusstrategiana tässä tutkimuksessa on etnografia. Kenttätutkimus on suoritettu kesällä 2016 eräässä suomalaisessa ruoka-avun toimipisteessä. Aineistoa on kerätty pääosin osallistuvalla havainnoinnilla sekä puolistrukturoiduin teemahaastatteluin. Teoreettisen viitekehyksen muodostavat vapaaehtoistyö ja eritoten sen motivaatiotekijät. Tutkimuksessa esitellää…
Dead wood profile of a semi-natural boreal forest – implications for sampling
2019
Dead wood profile of a forest is a useful tool for describing forest characteristics and assessing forest disturbance history. Nevertheless, there are few studies on dead wood profiles, including both coarse and fine dead wood, and on the effect of sampling intensity on the dead wood estimates. In a semi-natural boreal forest, we measured every dead wood item over 2 cm in diameter from 80 study plots. From eight plots, we further recorded dead wood items below 2 cm in diameter. Based on these data we constructed the full dead wood profile, i.e. the overall number of dead wood items and their distribution among different tree species, volumes of different size and decay stage categories. We …
Stress sensitivity of stylolite morphology
2009
International audience; Stylolites are rough surfaces that form by localized stress-induced dissolution. Using a set of limestone rock samples collected at different depths from a vertical section in Cirque de Navacelles (France), we study the influence of the lithostatic stress on the stylolites morphology on the basis of a recent morphogenesis model. We measured the roughness of a series of bedding-parallel stylolites and show that their morphology exhibits a scaling invariance with two self-affine scaling regimes separated by a crossover-length (L) at the millimeter scale consistent with previous studies. The importance of the present contribution is to estimate the stylolite formation s…
Entrapment of a linear water pentamer into a uranyl-salophen dimer in the solid state
2019
In the solid state, uranyl-salophen complex 1, decorated with bipyridyl sidearms, self-assembles from moist acetonitrile into dimeric species displaying a confined water pentamer, as observed by X-...
Yksilönä vaan ei yksin : lapset minuuden muodostajina päiväkodissa
2013
Testing refined shell-model interactions in the sd shell: Coulomb excitation of 26Na
2015
Background: Shell-model calculations crucially depend on the residual interaction used to approximate the nucleon-nucleon interaction. Recent improvements to the empirical universal sd interaction (USD) describing nuclei within the sd shell yielded two new interactions—USDA and USDB—causing changes in the theoretical description of these nuclei. Purpose: Transitionmatrix elements between excited states provide an excellent probe to examine the underlying shell structure. These observables provide a stringent test for the newly derived interactions. The nucleus 26Na with 7 valence neutrons and 3 valence protons outside the doubly-magic 16O core is used as a test case. Method: A radioactive b…
Characterization of IP-Based Communication for Smart Grid Using Software-Defined Networking
2018
The smart grid (SG) approach is based on a strong interaction between the network communication infrastructure and the power grid. Usually the management of the infrastructure is done by the distribution system operators (DSOs) that are worried about the increasing managing complexity due to the presence of increasing number of distributed energy resources and electrical vehicles. The use of software-defined networking (SDN) may simplify the network configuration and management for DSO, as highlighted from previous research works. The objective of this paper is to introduce and characterize an internet protocol (IP)-based communication architecture with specialized SDN bridges operating als…