5 research outputs found
Testilaitteen valmistus biodieselin tutkimiseen
Opinnäytetyö on osana 2010 syksyllä alkanutta Metropolian AMK:n ja UPM:n Concept Car -hanketta, jota Tekes on rahoittanut. Auton on suunniteltu käyttävän 100-prosenttista biodieseliä. Hankkeen yhtenä tavoitteena on selvittää biodieselin viskositeetti talvisissa olosuhteissa.
Tämän insinöörityön tavoitteena oli suunnitella ja valmistaa biodieselin viskositeetin tutkimiseen soveltuva testilaite sekä koekäyttää sitä tutkimusympäristössä. Työssä paneudutaan erityisesti testilaitteessa käytettävien komponenttien toimintaan.
Testilaite tehtiin Ford Fiesta 1.4 TDCi korkeapainejärjestelmän osista, jotka ovat Siemensin valmistamat. Moottorin tuottama käyttövoima korkeapainepumpulle korvattiin KLEEdriven kolmivaihesähkömoottorilla.
Työn lopputuloksena syntyi mekaanisesti toimiva dieselpolttoaineen tutkimuslaite. Korkeapainepumpun ja Railin ohjauksen parantamisella sillä saataisiin vertailukelpoisia tuloksia biodieselin viskositeetistä.This thesis is a part of Helsinki Metropolia University of Applied of Science and UPM’s Concept Car project started in fall 2010. The project is funded by Tekes. The Concept Car is planned to use 100 % biodiesel. One of the project objectives is to determine the viscosity of biodiesel in winter conditions.
The objective of this Bachelor’s thesis is to design and manufacture test equipment suitable for measuring biodiesel viscosity and to test the equipment in research environment. This thesis focuses on the functions of the components used in the test equipment.
The test equipment is made from components of Ford Fiesta Common Rail, manufactured by Siemens.
As a result of this thesis a mechanically functional device for diesel researching was made. After improving controls of the parts from Common Rail it would be possible to achieve comparable results for measuring biodiesel viscosity
Scoperta e valorizzazione del talento. Per la cittadinanza dell'allievo con disabilità. Discovery and appreciation of talent. For the citizenship of the student with disabilities
In Italia, dal 1977, gli allievi con disabilità certificata frequentano le scuole comuni, ufficialmente fanno parte di una classe, ma poiché seguono un piano educativo individualizzato, per lo più privo di collegamenti con i curricoli degli altri studenti, rischiano una nuova e più subdola esclusione.
Come promuovere l’inclusione didattica? Bisogna partire da ciò che vale per l’allievo, da ciò che per lui ha senso; non da ciò che è eccezionale rispetto agli altri, ma da ciò che lui fa bene e gli piace fare bene. Si parte dal talento perché è presente in tutti, non dalla genialità che è appannaggio di pochissimi.
Con una attività di ricerca-azione “Scoperta e valorizzazione didattica del talento”, oltre 2500 insegnanti della scuola secondaria hanno cercato il potenziale formativo di sviluppo esistenziale nel ragazzo che essi seguivano nel tirocinio.
Con questo articolo si avvia un ampio lavoro di analisi dei dati, con due interrogativi: 1) Chi sono, come e dove si collocano gli studenti disabili oggi? 2) In quali ambiti, situazioni e contesti si manifesta il talento
Efficient Charge Photogeneration by the Dissociation of PC<sub>70</sub>BM Excitons in Polymer/Fullerene Solar Cells
The role of PC<sub>70</sub>BM excitons in driving charge
photogeneration
in low bandgap polymer/fullerene bulk heterojunction solar cells has
been studied. Both transient absorption spectroscopy of charge generation
yields in blend films as a function of excitation energies and photocurrent
quantum efficiency spectra of the corresponding devices indicate that
charge generation in this system results primarily from direct optical
excitation of PC<sub>70</sub>BM. Blend composition studies of photocurrent
density and photoluminescence quenching indicate that the efficiency
of photocurrent generation is primarily determined by the limited
efficiency of PC<sub>70</sub>BM exciton diffusion to the polymer due
to the formation of PC<sub>70</sub>BM domains (≥5 nm). This
limitation becomes more severe as the PC<sub>70</sub>BM content is
increased above 50%. Despite this limitation and despite the poor
charge photogeneration from polymer excitons, organic solar cells
fabricated using this photoactive blend layer yielded device photocurrents
of 7.1 mA/cm<sup>2</sup>, maximal EQEs of 41%, and a device efficiency
of 3.1%
Isostructural, Deeper Highest Occupied Molecular Orbital Analogues of Poly(3-hexylthiophene) for High-Open Circuit Voltage Organic Solar Cells
We present the synthesis and characterization
of two novel thiazole-containing
conjugated polymers (<b>PTTTz</b> and <b>PTTz</b>) that
are isostructural to poly(3-hexylthiophene) (P3HT). The novel materials
demonstrate optical and morphological properties almost identical
to those of P3HT but with HOMO and LUMO levels that are up to 0.45
eV deeper. An intramolecular planarizing nitrogen–sulfur nonbonding
interaction is observed, and its magnitude and origin are discussed.
Both materials demonstrate significantly greater open circuit voltages
than P3HT in bulk heterojunction solar cells. <b>PTTTz</b> is
shown to be an extremely versatile donor polymer that can be used
with a wide variety of fullerene acceptors with device efficiencies
of up to 4.5%. It is anticipated that this material could be used
as a high-open circuit voltage alternative to P3HT in organic solar
cells