Search results for "rauta"

Keisarinasema ennen ja nyt : Lappeenrannan vanhan rautatieaseman merkitykset paikallisessa kontekstissa 1885-2017

2017

Tutkielma käsittelee tapausesimerkkinä Lappeenrannan entisen rautatieaseman merkityksiä sen elinkaaren 1885–2013 aikana ja edelleen nykyhetkenä, jolloin rakennusta ei enää ole. ”Vanhaksi asemaksi” ja myöhemmin ”Keisarinasemaksi” kutsutulla rakennuksella oli monivaiheinen historia, kunnes se vasta restauroituna katosi kaupunkikuvasta tulipalon seurauksena vuonna 2013. Tässä työssä tarkastellaan rakennuksen ja sen käyttäjien suhteen muuttumista, rakennuksen identiteetin muuttumista ja merkityksiä, joita rakennukseen on kohdistettu eri aikoina. Asemarakennus rakennettiin 1885 kun Lappeenrantaan valmistui Simolasta johtava haararata, joka mahdollisti entistä paremmat liikenneväylät kaupunkiin j…

The effect of iron on the biodegradation of natural dissolved organic matter

2016

Iron (Fe) may alter the biodegradation of dissolved organic matter (DOM), by interacting with DOM, phosphorus (P), and microbes. We isolated DOM and a bacterial community from boreal lake water and examined bacterial growth on DOM in laboratory experiments. Fe was introduced either together with DOM (DOM-Fe) or into bacterial suspension, which led to the formation of insoluble Fe precipitates on bacterial surfaces (Fe coating). In the latter case, the density of planktonic bacteria was an order of magnitude lower than that in the corresponding treatment without introduced Fe. The association of Fe with DOM decreased bacterial growth, respiration, and growth efficiency compared with DOM alon…

Proton reduction by phosphinidene-capped triiron clusters

2021

Bis(phosphinidene)-capped triiron carbonyl clusters, including electron rich derivatives formed by substitution with chelating diphosphines, have been prepared and examined as proton reduction catalysts. Treatment of the known cluster [Fe3(CO)9(µ3-PPh)2] (1) with various diphosphines in refluxing THF (for 5, refluxing toluene) afforded the new clusters [Fe3(CO)7(µ3-PPh)2(κ2-dppb)] (2), [Fe3(CO)7(µ3-PPh)2(κ2-dppv)] (3), [Fe3(CO)7(µ3-PPh)2(κ2-dppe)] (4) and [Fe3(CO)7(µ3-PPh)2(µ-κ2-dppf)] (5) in moderate yields, together with small amounts of the corresponding [Fe3(CO)8(µ3-PPh)2(κ1-Ph2PxPPh2)] cluster (x = -C4H6-, -C2H2-, -C2H4-, -C3H6-, -C5H4FeC5H4-). The molecular structures of complexes 3 a…

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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…

Haapamäki

1800

Helsinki

1876

saatu Timo Meriluodolta

Suomi

1893

Eero ja Erkki Fredriksonin säätiö

Suomi

1878

Euroopan puoleinen Venäjä

Eero ja Erkki Fredriksonin säätiö