Search results for "MAG"

Design of a Cleaning Program for a PV Plant Based on Analysis of Energy Losses

2015

Solar photovoltaic (PV) energy has grown significantly over the past few years. However, despite the increase in installed capacity, this energy source still raises important concerns related to the variability of power production. The short-term effects such as cloud shadowing and supply interruptions, as well as long-term effects such as dust accumulation, seasonal variation, and ageing of PV modules, can cause variability of power production. Therefore, the analysis of all the variability sources in order to provide statistically consistent power production data is an important challenge. This study presents a methodology to analyze data from a PV plant in order to have an independent ev…

SERS detection of cell surface and intracellular components of microorganisms using nano-aggregated Ag substrate

2016

Abstract The intracellular and cell surface composition and structural features of gram-positive and gram-negative bacteria were identified using near-infrared surface-enhanced Raman scattering (SERS). The structural differences of components that reside in the cell envelope are manifested by their SERS spectra, e.g. gram-negative vs. gram-positive. Silver particles were used as a SERS substrate by exploiting the existence of strong local electromagnetic fields (hot spots) within nanoscale aggregates of the particles. The aggregation of silver nanoparticles was induced by magnesium ions. These hot spots reduce the screening length of the double layer. The obtained SERS spectra showed excell…

Adsorption and Activation of Water on Cuboctahedral Rhodium and Platinum Nanoparticles

2017

Rh and Pt are widely used as the components in heterogeneous catalysts for multiple industrial applications. Because the metals are typically in the form of nanoparticles in real catalysts, it is important to carefully select models for the computational prediction of the catalytic properties. Here we report a first-principles study on the water activation, an important step in numerous catalytic reactions, using the finite-size Rh and Pt nanoparticle models and compare them to the extended surface models. We show that regardless of the model, adsorption and activation of water is practically identical for both metals, whereas the dissociation is energetically more favorable on Rh. The expe…

Iron and pH regulating the photochemical mineralization of dissolved organic carbon

2017

Solar radiation mineralizes dissolved organic matter (DOM) to dissolved inorganic carbon through photochemical reactions (DIC photoproduction) that are influenced by iron (Fe) and pH. This study addressed as to what extent Fe contributes to the optical properties of the chromophoric DOM (CDOM) and DIC photoproduction at different pH values. We created the associations of Fe and DOM (Fe-DOM) that cover the range of loadings of Fe on DOM and pH values found in freshwaters. The introduced Fe enhanced the light absorption by CDOM independent of pH. Simulated solar irradiation decreased the light absorption by CDOM (i.e., caused photobleaching). Fe raised the rate of photobleaching and steepened…

Phantom/liminal fat and feminist theories of the body

2017

This article brings together two concepts, ‘phantom fat’ and ‘liminal fat’, which both aim to grasp how fat in contemporary culture becomes a kind of material immateriality, corporeality in suspension. Comparing the spheres of representation and experience, we examine the challenges and usefulness of these concepts, and feminist fat studies perspectives more broadly, to feminist scholarship on the body. We ask what connects and disconnects fat corporeality and fat studies from ways of theorising other embodied differences, like gender, ‘race’, disability, class and sexuality, especially when thinking through their perceived mutability or removability, and assumptions about their relevance …

Visibility without voice: Media witnessing irregular migrants in BBC online news journalism

2016

In the analysis of journalistic representation of irregular migration to Europe, rather little attention is given to the variation of modes and genres of journalism. Most studies focus on text in ‘old media’ and the news genre. This article analyses affordances of different modalities and genres of online journalism in framing irregular migrants. Media framing in BBC online news coverage of a mediatised conflict in Spain, defined as a ‘migration crisis’, is analysed with multimodal social semiotics. While mediation makes global audiences witness tragedies at Europe's borders and online journalism affords more voice and deliberation for migrant sources, the frames of threat and victim domina…

"Tuomitaan taikuuden harjoittamisesta" : taikuusoikeudenkäynnit 1700-luvun lopun Pohjois-Pohjanmaalla ja Kainuussa

2007

Onnea tavoitellen, vaaraa välttäen : kansanomainen uskonnonharjoitus sekä noituus- ja taikuuskäsitykset puhdasoppisuuden ajan Kuopion pitäjässä

2009

Tutkielma käsittelee kansanomaista uskonnonharjoitusta sekä taikuuteen ja noituuteen liittyneitä käsityksiä Kuopion pitäjässä vuosina 1670–1710. Työssä tarkastellaan sitä, millaista rahvaan uskonnonharjoitus oli Ruotsin valtakunnan itäisessä periferiassa, ja millaisiin käsityksiin ja maailmankuvaan se perustui. Tutkielmassa käsitellään myös rahvaan ja papiston sekä maallisen esivallan välistä vuorovaikutusta ja selvitetään, miten rahvaan käsitykset oikeanlaisesta uskonnosta erosivat esivaltojen käsityksistä. Työn pääasiallisina lähteinä on käytetty Kuopion rovastin- ja piispantarkastusten pöytäkirjoja sekä kihlakunnanoikeuden renovoituja tuomiokirjoja. 1600-luvun Ruotsin valtakunnassa valti…

Snack portion size choice, expectations and actual experiences in children: the interplay of healthiness, hunger, and sensory food imagery

2018

International audience

Huoli kuvasta : merkitys, mieli, materiaalisuus

2017

This research is a hybrid of a monograph and a multiple-article dissertation. Its theoretical starting point is a phenomenologically based view of the being of the image, in which Georges Didi-Huberman´s work plays a central role. For him, as well as for Mieke Bal, a historical work of art is never only in the distant past only but also exists in the present actuality. This makes the temporality of the Image extremely complex. The Image can be encountered only “pre-posterously” (Bal) or by reading it “against the grain” (Didi-Huberman). The Image is necessarily anachronistic; it is not in time but opens up time. This fact should be taken into account not only in art history, but also in art…