Search results for "amp"
showing 10 items of 10184 documents
Photoelectric valuation of highly efficient Dye-Sensitized Solar Cells
2015
Nowadays, a growing demand for free and clean energy requires the study and the development of new low-cost solar photovoltaic (PV) cells. Among them, Dye Sensitized Solar Cells (DSSCs) based on ruthenium complexes as sensitizers are assuming a great importance. The DSSCs under study are composed placing in succession a transparent conductive glass on which is screen-printed a mesoporous TiO2 thin film sensitized by a ruthenium based dye (N719) , an electrolytic solution containing a redox couple (I-/I3-) and another conductive glass covered by a thin transparent catalyst platinum film. In this work, we have measured the main photoelectrochemical parameters of the above mentioned DSSCs at d…
Light Soaking measurements on Ruthenium-based Dye Sensitized Solar Cells
2016
An interesting phenomenon occurring in Dye Sensitized Solar Cells (DSSCs) when exposed to an uninterrupted period of illumination is the so-called light soaking effect, which consists in the increase of the main electrical parameters of the cell, such as the photocurrent and the efficiency. Studying such an effect has noteworthy practical implications, ranging from the optimization of the manufacturing process to stability tests of DSSCs. In this paper, we present an experimental investigation on the performance variation, due to light soaking, of Ruthenium-based DSSCs.
Characterization of Ruthenium-based Dye-Sensitized solar cells
2015
In this paper, we measure the main photoelectrical parameters of Dye Sensitized Solar Cells (DSSCs) based on ruthenium complexes at different irradiance levels, incident wavelengths, temperatures and hours of light soaking.
A single transient episode of hyperammonemia induces long-lasting alterations in protein kinase A.
2007
A single transient episode of hyperammonemia induces long-lasting alterations in protein kinase A. Am J Physiol Gastrointest Liver Physiol 292: G305-G314,2007; doi:10.1152/ajpgi.00100.2006.-Hepatic encephalopathy in patients with liver disease is associated with poor prognosis. This could be due to the induction by the transient episode of hepatic encephalopathy of long-lasting alterations making patients more susceptible. We show that a single transient episode of hyperammonemia induces long-lasting alterations in signal transduction. The content of the regulatory subunit of the protein kinase dependent on cAMP (PKA-RI) is increased in erythrocytes from cirrhotic patients. This increase is…
Somevaikuttajat koronaviestinnässä : Faktaa koronasta -kampanjan analyysia
2021
Somevaikuttajat kutsuttiin mukaan valtioneuvoston koronaviestintään keväällä 2020. Vaikuttajien somepostausten ja seuraajien kommenttien analysointi kielii siitä, että Suomessa elettiin vielä pandemian alkutaipaleella yhtenäisyyden aikaa. nonPeerReviewed
Tipaton tammikuu : lehdistökirjoittelun sisällön analyysi viidestä sanomalehdestä vuosilta 2006-2011
2012
Suomalaisten alkoholin kulutus on lisääntynyt huomattavasti viimeisten vuosikymmenten aikana. Lisääntyneen kulutuksen myötä myös alkoholihaitat ovat kasvaneet. Tipaton tammikuu on viestintään perustuva, alkoholinkäytön hallintaan tähtäävä kampanja. Tutkimuksen tarkoituksena oli selvittää sanomalehtien antamaa kuvaa Tipattomasta tammikuusta; kuka sitä lehtiteksteissä määrittää ja miten Tipattoman tammikuun lehtikirjoittelu tukee sille asetettua tavoitetta, alkoholinkäytön omaehtoista hallintaa. Aineisto koostui vuosien 2006-2011 aikana kerätyistä, viiden sanomalehden Tipattomasta tammikuusta kertovista jutuista (n=235). Aineisto analysoitiin luokittelemalla ja käyttämällä sisällönanalyysia. …
Social marketing : doing well by doing good? a look into organizations? marketing communication campaigns on social issues in Finland
2010
This study examined social marketing and related dimensions by looking at case campaigns of three Finnish organizations of the public, business and civic sector. Marketing on these sectors is about behavioral influence, but has diverse characteristics. The aims of the research were to clarify the multidimensional field of marketing applied to social issues, to find out the different dimensions, and to examine in which dimensions the case campaigns fit. Social marketing and related disciplines were studied as variants of marketing. A societal perspective and roles of mass media in creating social change were emphasized. The study could benefit the organizational communications and marketing …
SCOPE-Based Emulators for Fast Generation of Synthetic Canopy Reflectance and Sun-Induced Fluorescence Spectra
2017
Progress in advanced radiative transfer models (RTMs) led to an improved understanding of reflectance (R) and sun-induced chlorophyll fluorescence (SIF) emission throughout the leaf and canopy. Among advanced canopy RTMs that have been recently modified to deliver SIF spectral outputs are the energy balance model SCOPE and the 3D models DART and FLIGHT. The downside of these RTMs is that they are computationally expensive, which makes them impractical in routine processing, such as scene generation and retrieval applications. To bypass their computational burden, a computationally effective technique has been proposed by only using a limited number of model runs, called emulation. The idea …
Gaismas avotu pildījuma ietekme uz starojuma spektru talliju saturošās augstfrekvences bezelektrodu lampās
2019
Bakalaura darbā tika pētīta talliju saturošu augstfrekvences bezelektrodu lampu pildījuma ietekme uz to spektru. Lai to izdarītu, tika analizētas tallija un argona spektrāllīniju intensitātes izmaiņas atkarībā no ierosmes ģeneratora sprieguma, kā arī pētīta to stabilitāte laikā. Tāpat tika novērtēta palīgelementu – antimona un joda - ietekme uz starojuma spektra intensitāti un stabilitāti. Izmantojot hidroksilradikāļa OH rotācijas joslu spektru, tika noteikta gāzes temperatūra. Darbā iegūtajos rezultātos var novērot, ka, palielinot ģeneratora spriegumu, tallija spektrālo līniju relatīvā intensitāte strauji pieaug un ka antimona pievienošana lampā būtiski ietekmē spektrālo līniju relatīvo in…
Eksperimentālas iekārtas izveide un testēšana fotodiodes voltampēru raksturlīknes spektrālās atkarības noteikšanai
2022
Darba mērķis ir novērtēt, vai no Latvijas Universitātes Cietvielu fizikas institūta laboratorijā atsevišķi pieejamām ierīcēm ir iespējams izveidot vienotu automatizētu mērīšanas iekārtu, kas būtu lietojama fotodiožu izejas signāla spektrālās atkarības noteikšanai. Pirmajā nodaļā ir veikta literatūras analīze par pusvadītājiem. Otrajā nodaļā ir secīgi aprakstīta automatizētās mērīšanas iekārtas izveide. Trešajā nodaļā tiek analizēti iegūtie rezultāti, veikta salīdzināšana ar teorētiskajiem datiem. Iegūtie rezultāti parāda, ka no Latvijas Universitātes Cietvielu fizikas institūta laboratorijā atsevišķi pieejamām ierīcēm ir iespējams izveidot vienotu automatizētu mērīšanas iekārtu fotodiožu iz…