Search results for "Kite"
showing 10 items of 1123 documents
Ferroelastic Fingerprints in Methylammonium Lead Iodide Perovskite
2016
Methylammonium lead iodide (MAPbI3) perovskite shows an outstanding performance in photovoltaic devices. However, certain material properties, especially the possible ferroic behavior, remain unclear. We observed distinct nanoscale periodic domains in the piezoresponse of MAPbI3(Cl) grains. The structure and the orientation of these striped domains indicate ferroelasticity as their origin. By correlating vertical and lateral piezoresponse force microscopy experiments performed at different sample orientations with X-ray diffraction, the preferred domain orientation is suggested to be the a1–a2-phase. The observation of these ferroelastic fingerprints appears to strongly depend on the film t…
Yliopistouudistuksen diskursiivinen rakentuminen Jyväskylän yliopistoyhteisössä 2009-2010
2012
Pro gradu -tutkielmassani tarkastelen Suomen uudelle yliopistolaille (2009) annettuja ristiriitaisia merkityksiä Jyväskylän yliopistoyhteisössä. Yliopistouudistus toi mukanaan merkittäviä taloudellisia ja ideologisia muutoksia suomalaiseen yliopistokenttään, ja siksi muutoksista on kiistelty paljon. Keskusteluissa on kuitenkin luonnehtinut ”yliopistouudistus hyvänä vs. pahana” -asettelu, joka ei ole paras mahdollinen tapa lähestyä uudistuksen jälkiteollisia syitä ja moninaisia seurauksia. Diskurssintutkimuksen näkökulmasta yliopistouudistuskeskustelut ovat kielellisten ”totuuksien” luomista siitä, mikä on suomalaisten yliopistojen tarkoitus nyky-yhteiskunnassa. Näillä ”totuuksilla” eli ylio…
Direct Methane Oxidation on La1-xSrxCr1-yFeyO3-δ perovskite-type oxides as Potential Anode for Intermediate Temperature Solid Oxide Fuel Cells
2016
Abstract La1−xSrxCr1−yFeyO3−δ (x = 0, 0.1, 0.15, 0.2; y = 0, 0.3, 0.5) perovskite-type oxide powders were synthesized by solution combustion synthesis and characterized by X-ray diffraction, X-ray photoelectron spectroscopy and H2-temperature programmed reduction. Selected compositions were studied by CH4-temperature programmed reduction in the absence and in the presence of H2S. Temperature programmed oxidation and structural characterizations were performed in order to discriminate the nature of residual deposits on the catalyst surface. The study about reduction in different methane-based mixture revealed that total and partial methane oxidation occurred in the range ∼450–1000 °C indepen…
Editorial for the Proceedings of the 2016 E-MRS Spring Meeting Symposium T - Advanced Materials and Characterization Techniques for Solar Cells III
2016
Abstract This paper contains the editorial of the proceedings of the 2016 E-MRS spring meeting symposium T on “Advanced materials and characterization techniques for solar cells III”.
Indium doping of proton-conducting solid oxides
2008
Solid oxides protonic conductors are prepared by doping the pure matrix compounds with cationic species. Barium cerate and barium zirconate are perovskite-like compounds, characterized by a network of corner-sharing MeO6 octahedra (Me=Ce, Zr). Barium lies in the cavities between octahedra. Insertion of trivalent species in the octahedral site involves the formation of charge- compensating oxygen vacancies, that can be filled by hydroxyls coming from dissociative water absorption. Then, proton delocalization among structural oxygens ensures conductivity. The most effective conductors are obtained by yttrium doping that, on the other hand, enters only in limited amounts in both BaZrO3 and BaC…
An early interaction music therapy model
2014
Tämä Pro Gradu tutkielma esittelee kolmivaiheisen varhaisen vuorovaikutuksen musiikkiterapian työskentelymallin. Malli sisältää varhaisen vuorovaikutuksen dyadi-musiikkiterapian ja vanhemman oman psykodynaamisen tai kriisi- ja traumatyöpainotteisen musiikkiterapiaprosessin. Työskentelymallia tutkitaan teoreettisesti ja tapaustutkimuksen kautta. Tutkimus on kvalitatiivinen mutta sisältää kvantitatiivisen varhaisen vuorovaikutuksen videoarvioinnin. This case study presents a threefold Early Interaction Music Therapy Model which is created in the child protection context. It contains mother-infant music therapy and mother’s own music therapy processes. The first two parts occur in mother-infan…
Effect of coatings on long term behaviour of a commercial stainless steel for solid oxide electrolyser cell interconnect application in H2 /H2O atmos…
2014
Abstract K41X (AISI 441) stainless steel evidenced a high electrical conductivity after 3000 h ageing in H 2 /H 2 O side when used as interconnect for solid oxide electrolyser cells (SOEC) working at 800 °C. Perovskite (La 1 − x Sr x MnO 3 − δ ) and spinel (Co 3 O 4 ) oxides coatings were applied on the surface of the ferritic steel for ageing at 800 °C for 3000 h. Both coatings improved the behaviour of the steel and give interesting opportunities to use the K41X steel as interconnect for hydrogen production via high temperature steam electrolysis. Co 3 O 4 reduced into Co leading to a very good Area Specific Resistance (ASR) parameter, 0.038 Ω cm 2 . Despite a good ASR (0.06 Ω cm 2 ), La …
Azatruxene‐Based, Dumbbell‐Shaped, Donor–π‐Bridge–Donor Hole‐Transporting Materials for Perovskite Solar Cells
2020
Three novel donor-π-bridge-donor (D-π-D) hole-transporting materials (HTMs) featuring triazatruxene electron-donating units bridged by different 3,4-ethylenedioxythiophene (EDOT) π-conjugated linkers have been synthesized, characterized, and implemented in mesoporous perovskite solar cells (PSCs). The optoelectronic properties of the new dumbbell-shaped derivatives (DTTXs) are highly influenced by the chemical structure of the EDOT-based linker. Red-shifted absorption and emission and a stronger donor ability were observed in passing from DTTX-1 to DTTX-2 due to the extended π-conjugation. DTTX-3 featured an intramolecular charge transfer between the external triazatruxene units and the azo…
Heterovalent BiIII/PbII ionic substitution in one-dimensional trimethylsulfoxonium halide pseudo-perovskites (X = I, Br)
2021
We report on the synthesis and characterization of novel lead and bismuth hybrid (organic-inorganic) iodide and bromide pseudo-perovskites (ABX3) containing the trimethylsulfoxonium cation (CH3)3SO+ (TMSO) in the A site, Pb/Bi in the B site, and Br or I as X anions. All of these compounds are isomorphic and crystallize in the orthorhombic Pnma space group. Lead-based pseudo-perovskites consist of one-dimensional (1D) chains of face-sharing [PbX6] octahedra, while in the bismuth-based ones, the chains of [BiX6] are interrupted, with one vacancy every third site, leading to a zero-dimensional (0D) local structure based on separated [Bi2I9]3- dimers. Five solid solutions for the iodide with di…
Victims of family violence identified in emergency care : comparisons of mental health and somatic diagnoses with other victims of interpersonal viol…
2019
Family violence is a global health problem incurring significant costs to both individuals and health care systems. However, family violence as a cause of trauma and other health issues is often unidentified in patients attending emergency care. Better understanding of the risk factors associated with family violence could improve the identification and treatment of victimized patients in health care settings. Little longitudinal research exists on the mental and somatic health of family violence victims currently identified in EDs and little is known about how victims of family violence differ from other help-seeking victims of interpersonal violence. A total of 345 patients were identifie…