Search results for "Vapo"
showing 10 items of 1217 documents
Investigation of Activities for Pt-M Bimetallic Nanoparticles Catalysts on the Oxygen Reduction Reaction
2015
Bi-metallic Pt3Ni/C and Pt3Co/C electrocatalysts were successfully synthesized by a solvent free chemical vapour deposition method with a narrow particle size distribution. The results showed that the electrochemical surface area was increased by adding the additional Ni or Co to a pure Pt catalyst. Pt3Ni/C catalyst exhibited a significant enhancement of oxygen reduction reaction activity. The catalysts were characterized by EDS, XRD, HRTEM and electrochemical activity was determined using cyclic voltammetry.
Influence of oxide substrates on monolayer graphene doping process by thermal treatments in oxygen
2019
Abstract The structural and the electronic properties of monolayer graphene made by chemical vapor deposition and transferred on various oxide substrates ( SiO 2 , Al 2 O 3 , and HfO 2 ) are investigated by Raman Spectroscopy and Atomic Force Microscopy in order to highlight the influence of the substrate on the features of p-doping obtained by O 2 thermal treatments. By varing the treatment temperature up to 400 °C, the distribution of the reaction sites of the substrates is evaluated. Their total concentration and the consequent highest doping available is determined and it is shown that this latter is linked to the water affinity of the substrate. Finally, by varing the exposure time to …
Dependence of the emission properties of the germanium lone pair center on Ge doping of silica
2011
We present an experimental investigation regarding the changes induced by the Ge doping level on the emission profile of the germanium lone pair center (GLPC) in Ge doped silica. The investigated samples have been produced by the sol-gel method and by plasma-activated chemical vapor deposition and have doping levels up to 20% by weight. The recorded photoluminescence spectra show that the GLPC emission profile is the same when the Ge content is lower than ∼ 1% by weight, whereas it changes for higher doping levels. We have also performed Raman scattering measurements that show the decrease of the D1 Raman band at 490 cm( - 1) when the Ge content is higher than 1% by weight. The data suggest…
Water Fluxes in Polymeric Membranes for Desalination via Membrane Distillation
2010
Membrane distillation is an emerging technique for seawater desalination. Hydrophobic polymeric membranes are used to separate the solute‐free water vapour from the hot solution. Vapour fluxes of commercial polymeric membranes were measured in various conditions, i.e. natural and forced convection and vacuum. Vapour fluxes were also predicted with models and compared with experimentals. Higher fluxes were recorded in vacuum conditions.
The role of agroecosystems for invasion of a generalist herbivore
2014
Twenty Years of Airborne Water Vapor and Total Water Measurements of a Diode Laser Based Photoacoustic Instruments
2020
We present relevant issues collected over twenty years of development and operation of an airborne water vapour / total water detector based on photoacoustic spectroscopy. The WaSulHygro instrument possesses high selectivity, short response time, and wide dynamic range, that are key requirements against trace gas measurement systems for applications in atmospheric sciences. Besides the major properties of WaSul-Hygro we discuss our efforts to develop a robust instruments that have proved its long-term reliability over the last fifteen years operating on-board a commercial aircraft within the framework of the CARIBIC project.2
In-flight recoil separators RITU and MARA and the standard detector setups
2023
In-flight recoil separators RITU and MARA at Jyväskylä Accelerator Laboratory are complementary devices to separate the fusion-evaporation residues from the primary beam and other reaction products. The nuclear-structure-research program at Jyväskylä utilizes these separators and the detector setups shared between the separators to identify weak reaction channels and extract nuclear-structure information via decay experiments and in-beam spectroscopic studies. For example the very weak N∼Z nuclei are studied in-beam by using 𝛽-decay tagging method (Tuike scintillator) enhanced with the mass selection (MARA) and charge particle-evaporation veto (JYTube). peerReviewed
Muuttuvat hyvinvointivaltiot : eurooppalaiset hyvinvointivaltiot reformoitavina
2017
Isäntämaan kulttuurin kompetenssi muisteltuna : vapolaisten kertomuksia Neuvostoliitosta ja neuvostoliittolaisista
2010
Pro gradussani olen haastatellut viittä Vapon työntekijää heidän muistoistaan Neuvostoliitosta ja neuvostoliitto-laisista. Olen tulkinnut heidän kertomuksiaan isäntäkulttuurin viestintäkompetenssin komponenttien kautta, koska olen halunnut nostaa esille kertomuksien viestinnälliseen oppimiseen ja osaamisen liittyvät ainekset. Lisäksi olen halunnut tutkia sitä, miten tällainen analyysitapa vaikuttaa muistitiedon esittämiseen. Neuvostoliittolaisten kanssa toimiessa on täytynyt ottaa huomioon Neuvostoliiton erityinen yhteiskunnallinen järjestys, erityisesti yksipuolue järjestelmä ja suunnitelmallinen talousmalli. Vapolaisten keskeisintä osaamista viestinnässä on ollut konfliktien välttäminen. …
Käyttäjän manipulointi organisaation tietoturvauhkana
2016
Tämän tutkielman aiheena on käyttäjän manipulointi organisaation tietoturvauhkana. Käyttäjän manipulointi (engl. social engineering) viittaa organisaation henkilöstön inhimillisiin piirteisiin tietoturvariskin tekijänä. Vahva tekninen tietoturvantaso suojaa organisaatiota verkon välityksellä yritetyiltä tietomurroilta, mutta järjestelmien käyttäjien inhimilliset heikkoudet jäävät usein huomiotta. Tutkielmassa kuvaillaan, kuinka käyttäjän manipulointi toimii tietoturvaa uhkaavana tekijänä, sekä kuinka organisaatio voi varautua manipulointia hyödyntäviä hyökkäyksiä vastaan. Tutkielman tavoitteena on tunnistaa tekijät, jotka mahdollistavat käyttäjään kohdistuvan manipuloinnin, sekä keinot, joi…