Search results for "Kite"

Lead acetate precursor based p-i-n perovskite solar cells with enhanced reproducibility and low hysteresis

2015

A low temperature approach for the fabrication of p-i-n perovskite solar cells is presented. Using lead acetate-based precursors, flat and homogeneous CH3NH3PbI3 films, compatible with the use of thin organic charge transport layers, can be obtained. The corresponding solar cells showed power conversion efficiency up to 12.5%, with remarkable reproducibility and very low hysteresis.

Scoping review and concept analysis of early adolescents’ emotional skills : Towards development of a music therapy assessment tool

2021

Introduction: This paper describes the concept and content of early adolescents’ emotional skills among the general population. The research literature contains many emotional skills-related terms with overlapping meanings, and it can be challenging to determine which are applicable for example, to a music therapy assessment tool. This study comprises the first phase of developing an assessment tool for early adolescents’ emotional skills, namely, determining what is to be assessed. Method: A scoping review of the literature is presented with written definitions of emotional skills-related terms, as well as a concept analysis of the terms performed using Walker and Avant’s method. Results: …

Manipulating spontaneous emission of the CsPbI3 Perovskite NCs using hybrid (HMM-Mie resonator) structures

2021

Cerium effect on the phase structure, phase stability and redox properties of Ce-doped strontium ferrates

2006

Nanostructured perovskite-type Sr1−aCeaFeO3−x, (0⩽a<0.15) powders have been prepared by citrate–nitrate smoldering auto-combustion. Their phase structure and stability, surface and morphological properties, reduction behavior and interaction with oxygen have been investigated by X-ray Powder Diffraction combined with Rietveld Analysis, 57Fe Mossbauer and X-ray Photoelectron Spectroscopies, N2-adsorption method, Temperature Programmed Reduction and Oxidation experiments. Our results reveal that citrate–nitrate auto-combustion method is effective in obtaining single phase Sr1−aCeaFeO3−x. The Sr1−aCeaFeO3−x structure is cubic only for a⩾0.06, while for a<0.06 remains tetragonal. Moreover, for …

Structural and morphological properties of Co-La catalysts supported on alumina/lanthana for hydrocarbons oxidation

2004

Abstract Two Al 2 O 3 (24 wt%)–La 2 O 3 (76 wt%) supported Co–La oxides with Co loading 4 wt% and different La content (1 and 9 wt%) were prepared by co-impregnation of the support, the aluminum–lanthanum oxide, with cobalt and lanthanum nitrates in aqueous solution and successive calcination at 800 °C for 4 h. The alumina–lanthana was synthesized by the sol–gel method. The samples were characterized by X-ray diffraction (XRD) and Rietveld refinement in order to identify the crystalline phases and their relative weight. H 2 -TPR (Temperature Programmed Reduction) experiments were recorded with the aim to identify the different Co phases present. Co 3 O 4 and LaCoO 3 were formed for La loadi…

Tietoturvan toteutus SD-WAN -operaattoripalveluissa

2017

Tutkielmassa selvitettiin vaihtoehtoja, joiden avulla palomuuraukseen liittyvä tekninen tietoturva voidaan toteuttaa uusissa SD-WAN -pohjaisissa verkottamisratkaisuissa ja niihin liittyvissä hybridiverkoissa operaattorin näkökulmasta. Palomuuraukseen liittyvää ratkaisua tulisi voida hyödyntää operaattorin asiakasverkoissa ja sen tulee skaalautua asiakkaiden käyttämien palveluiden mukaisesti. Tutkielmassa analysoitiin, kuinka SDN- ja NFV-teknologioita voidaan hyödyntää palomuurauksen toteutuksessa ja kannattaako palomuuraus toteuttaa SDN-pohjaisessa verkossa keskitetysti vai hajautetusti. Lisäksi pohdittiin, kuinka verkon hallinta voidaan toteuttaa keskitetysti, jotta jokaista verkon laitett…

Change of Direction Biomechanics in a 180-Degree Pivot Turn and the Risk for Noncontact Knee Injuries in Youth Basketball and Floorball Players.

2021

Background: Studies investigating biomechanical risk factors for knee injuries in sport-specific tasks are needed. Purpose: To investigate the association between change of direction (COD) biomechanics in a 180-degree pivot turn and knee injury risk among youth team sport players. Study Design: Cohort study; Level of evidence, 2. Methods: A total of 258 female and male basketball and floorball players (age range, 12-21 years) participated in the baseline COD test and follow-up. Complete data were obtained from 489 player-legs. Injuries, practice, and game exposure were registered for 12 months. The COD test consisted of a quick ball pass before and after a high-speed 180-degree pivot turn o…

Influence of mobile ions on the electroluminescence characteristics of methylammonium lead iodide perovskite diodes

2016

In this work, we study the effect of voltage bias on the optoelectronic behavior of methylammonium lead iodide planar diodes. Upon biasing the diodes with a positive voltage, the turn-on voltage of the electroluminescence diminishes and its intensity substantially increases. This behavior is reminiscent of that observed in light-emitting electrochemical cells (LECs), single-layer electroluminescent devices in which the charge injection is assisted by the accumulation of ions at the electrode interface. Because of this mechanism, performances are largely independent from the work function of the electrodes. The similarities observed between planar perovskite diodes and LECs suggest that mobi…

Evolution of a Permian intraoceanic arc–trench system in the Solonker suture zone, Central Asian Orogenic Belt, China and Mongolia

2010

Abstract The identification of a fossil arc–trench system from the ophiolite-decorated Solonker suture zone in the southernmost Central Asian Orogenic Belt (CAOB) enables us to constrain the timing of pre-subduction extension (ca. 299–290 Ma), subduction initiation (ca. 294–280 Ma), ridge–trench collision (ca. 281–273 Ma) and slab break-off (ca. 255–248 Ma) in the Permian. A fraction of proto-arc crust (ca. 45 km long, up to 8 km wide) is preserved as a volcanic–plutonic sequence and is juxtaposed against a wide (ca. 30–80 km) forearc melange. This proto-arc crust comprises two distinct magma series, island arc tholeiite (IAT) and mid-ocean ridge basalt (MORB), both of which have strong sup…

Episodic mantle melting-crustal reworking in the late Neoarchean of the northwestern North China Craton: Zircon ages of magmatic and metamorphic rock…

2012

Abstract The Yinshan Block in the northwestern North China Craton comprises late Neoarchean greenstones, high-grade metamorphic rocks (granulite, charnockite, enderbite and amphibole gneiss), diorites (sanukitoid and Mg-adakite) and granitoids (predominantly trondhjemite-tonalite). A greenstone terrane comprises a volcanic sequence of predominant basalt and dacite, with minor andesite. Zircons from a high-Mg andesite and an andesite have weighted mean 207Pb/206Pb ages of 2533 ± 5 Ma and 2510 ± 7 Ma, respectively, which reflect the timing of two distinct volcanic episodes. These two either predated or postdated a major volcanic episode that formed a basalt-dacite bimodal suite during 2515 ± …