Search results for "SERS"

showing 10 items of 478 documents

SISTEMI PASSIVI PER L’INDOOR COMFORT: LA GESTIONE DELLE SERRE SOLARI IN REGIME ESTIVO

2019

La radiazione solare costituisce una fonte inesauribile di energia. Negli ultimi anni il mercato edilizio è stato invaso dall’applicazione di sistemi attivi (pannelli solari, etc...), non considerando le più valide alternative passive per il risparmio energetico. Oggi le mutate esigenze connesse all’evoluzione del concetto stesso di benessere ambientale richiedono una nuova coniugazione delle esperienze della tradizione costruttiva con le complessità dell’organizzazione tecnologica e i bisogni dell’utenza. La serra solare è un elemento architettonico complesso che consente un condizionamento sia invernale che estivo. Progettare sistemi passivi vetrati integrati con l’involucro permette al c…

Settore ICAR/10 - Architettura TecnicaPassive system indoor comfort solar greenhouse active users
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Mitteleuropa oltre il mito. Rinuncia, nostalgia, il caso Moor

2019

The paper focuses on the co-existence of national identities, the concepts of Central Europe as a geographic space, and Mitteleuropa as a cultural space. In particular, it examines the development of a cultural unity need after the fall of the Austrian Empire, namely from the time of independent small states after the WWI, to the time of the iron curtain that reshaped the continent into two halves, West and East, thus delating the spirit of Mitteleuropa. As Milan Kundera wrote in 1983, at end of WWII the civil frame of Central Europe disappeared, and only the idea of a cultural community survived for a long time. On the one hand, the "nostalgia" of Mitteleuropa, and the new policy after the…

Settore L-ART/07 - Musicologia E Storia Della MusicaCentral Europe Mitteleuropa National Trend The Role of Bohemian Composers Karel Moor
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Scritti in onore di Pellegrino Capaldo

2014

La qualità dei servizi è stata riconosciuta come un rilevante aspetto caratterizzante la performance dell’azienda pubblica, analogamente alla capacità di operare secondo criteri di efficienza e nel rispetto dei vincoli di bilancio. Sebbene sia possibile riscontrare alcuni significativi casi di adozione di politiche di customer satisfaction nelle amministrazioni pubbliche italiane, a tutt’oggi il tema presenta significative criticità, specialmente in ordine agli aspetti metodologici e agli strumenti operativi che consentano di integrare dette politiche nel sistema di programmazione e controllo delle aziende che erogano tali servizi. Il presente lavoro adotta una diversa prospettiva di analis…

Settore SECS-P/07 - Economia AziendaleQuality in delivering public services has been recognised as a major issue challenging performance in the public sector as well as the ability to operate effectively and within budget constraints. Empirical findings shown by the literature demonstrate that concrete efforts have been produced towards the evaluation and improvement of satisfaction levels of citizens and other Public Administration’s ‘customers’. However still today this issue portrays many unresolved criticalities particularly concerning the methodological approaches and operative tools to adopt in order to integrate ‘customer satisfaction’ programs with the wider organisational control system in each public administration. This paper adopts a non-conventional view of the ‘customer satisfaction’ concept. This is currently meant as a matter of social reporting or even statistical analysis based on the users’ perceptions on the level of provided services by a given (front office) unit in the public sector. Here an inter-institutional perspective is adopted with a view to map the overall value chain leading to the final product delivered to citizens or the community. Inside this chain tracking the underlying administrative products delivered by back-office units to their ‘internal clients’ in the public administration is recommended as a fundamental step to understand how to improve performance in satisfying citizens’ needs. This should also require a proper link between the administrative units’ goals and performance measures to the desired efficiency and effectiveness of processes leading to the attainment of administrative products providing the basis of the final services delivered to the private sector. Based on first empirical findings from field analysis in the Italian context the paper aims to outline an approach which could assist both politicians and managers to better assess and improve performance according to a customer satisfaction perspective.
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Dissipative shock waves in all-normal-dispersion mode-locked fiber lasers

2014

4 pags.; 4 figs.; OCIS codes: (140.4050) Mode-locked lasers; (140.3510) Lasers, fiber.

Shock wavePhysicsSpectral shape analysisbusiness.industryLasersLasers; fiber Mode-locked lasersDissipationMode-locked lasersAtomic and Molecular Physics and OpticsBurgers' equationOpticsFiber laserDissipative systemDispersion (water waves)businessPhotonic-crystal fiberfiber
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Periodic time-domain modulation for the electrically tunable control of optical pulse train envelope and repetition rate multiplication

2012

An electrically tunable system for the control of optical pulse sequences is proposed and demonstrated. It is based on the use of an electrooptic modulator for periodic phase modulation followed by a dispersive device to obtain the temporal Talbot effect. The proposed configuration allows for repetition rate multiplication with different multiplication factors and with the simultaneous control of the pulse train envelope by simply changing the electrical signal driving the modulator. Simulated and experimental results for an input optical pulse train of 10 GHz are shown for different multiplication factors and envelope shapes. © 2006 IEEE.

Signal processingElectrically tunableMultiplication factorElectrical signalPhysics::Optics02 engineering and technologyOptical signal processingSimultaneous control01 natural sciencesOptical pulse train010309 opticsQ switched lasers020210 optoelectronics & photonicsOptics0103 physical sciencesTEORIA DE LA SEÑAL Y COMUNICACIONES0202 electrical engineering electronic engineering information engineeringTalbot effectPulse waveOptical fibersTime domainOptical fiber dispersionElectrical and Electronic EngineeringTemporal Talbot effectsEnvelope (waves)PhysicsTelecomunicacionesDispersive devicesRepetition rate multiplicationbusiness.industryOptical pulse shapingAtomic and Molecular Physics and OpticsPulse (physics)Optical signalsPhase modulationModulationTemporal Talbot effectElectro-optic modulatorsPulse trainOptical pulse sequencesDiffraction gratingsMultiplicationElectrónicaTime domainbusinessPhase modulation
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Effect of surface treatment with sandblasting and Er,Cr:YSGG laser on bonding of stainless steel orthodontic brackets to silver amalgam

2011

Objectives: Satisfactory bonding of orthodontic attachments to amalgam is a challenge for orthodontists. The aim of this in vitro study was to compare the shear bond strength of stainless steel orthodontic brackets to silver amalgam treated with sandblasting and Er,Cr:YSGG laser. Study Design: Fifty-four amalgam discs were prepared, polished and divided into three groups: In group 1 (the control group) the premolar brackets were bonded using Panavia F resin cement without any surface treatment; in groups 2 and 3, the specimens were subjected to sandblasting and Er,Cr:YSGG laser respectively, before bracket bonding. After immersing in distilled water at 37°C for 24 hours, all the specimens w…

SilverMaterials scienceOrthodontic BracketsDentistryLasers Solid-StateDental bondingengineering.materialDental Amalgamlaw.inventionstomatognathic systemlawMaterials TestingStereo microscopePremolarmedicineComposite materialGeneral Dentistrybusiness.industryBracketDental Bondingtechnology industry and agricultureStainless SteelLaser:CIENCIAS MÉDICAS [UNESCO]Shear bondAmalgam (dentistry)Orthodontic bracketsmedicine.anatomical_structureOtorhinolaryngologyUNESCO::CIENCIAS MÉDICASDental EtchingengineeringResearch-ArticleLaser in DentistrySurgerybusiness
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Identifying yeasts using surface enhanced Raman spectroscopy

2019

Made available in DSpace on 2019-10-06T15:40:09Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-07-05 Tekes Academy of Finland Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) The molecular fingerprints of yeasts Saccharomyces cerevisiae, Dekkera bruxellensis, and Wickerhamomyces anomalus (former name Pichia anomala) have been examined using surface-enhanced Raman spectroscopy (SERS) and helium ion microscopy (HIM). The SERS spectra obtained from cell cultures (lysate and non-treated cells) distinguish between these very closely related fungal species. Highly SERS active silver nano-particles suitable for detecting complex biomolecules were fabricated using a simple synt…

SilverPichia anomalaWickerhamomyces anomalusSurface PropertiesSaccharomyces cerevisiaeMetal Nanoparticles02 engineering and technologySaccharomyces cerevisiaeheliumyeast010402 general chemistrySpectrum Analysis Raman01 natural sciencesSilver nanoparticlePichiaAnalytical ChemistryBiokemia solu- ja molekyylibiologia - Biochemistry cell and molecular biologysymbols.namesakehiivaYeastsaggregaatitMycological Typing TechniquesInstrumentationSpectroscopychemistry.chemical_classificationChromatographyta114biologyDekkeraChemistrySERSBiomoleculehopeasilver nanoparticleSurface-enhanced Raman spectroscopy021001 nanoscience & nanotechnologybiology.organism_classificationAtomic and Molecular Physics and OpticsYeastYeast0104 chemical sciences3. Good healthaggregatesymbolshelium ion microscopynanohiukkaset0210 nano-technologyRaman spectroscopy
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Laser-Ablation-Induced Synthesis of SiO2-Capped Noble Metal Nanoparticles in a Single Step

2010

Here we describe a simple, powerful technique based on the laser ablation of a target immersed in a water solution of a metal salt. With this method, nanoparticles of different metals and alloys can be processed very quickly. Both the target and the salt solution can be chosen to produce metal nanoparticles of different sizes, surface-oxidized nanoparticles (silica-silver, for example), or even more complex structures to be defined by the researcher on one or more steps because the technique combines the advantages of both physical and chemical methods. We have applied this technique to the fabrication of inert silica-metal (silver, gold, and silver-gold) nanoparticles with a strong surface…

SilverSurface PropertiesSilicon dioxideMetal NanoparticlesMineralogyNanoparticleNanotechnologyengineering.materialLaser ablation synthesis in solutionColloidchemistry.chemical_compoundElectrochemistryGeneral Materials ScienceParticle SizeSurface plasmon resonanceSpectroscopyLaser ablationChemistryLasersSurface plasmonSurfaces and InterfacesSilicon DioxideCondensed Matter PhysicsengineeringNoble metalGoldLangmuir
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‘I’m still the master of the machine.’ Internet users’ awareness of algorithmic decision-making and their perception of its effect on their autonomy

2020

Algorithms are an integral part of our everyday lives and shape the selection and presentation of information and communication on the internet. At the same time, media users are faced with a lack of control and transparency when interacting with these systems because algorithms largely remain black boxes to end users. Relying on the notion that algorithms are socio-technical systems that comprise both technical and human components, this paper examines internet users’ awareness of algorithms in different areas of internet use and inquires into users’ perceptions of the impact of algorithms on their autonomy when interacting online. Empirically, we rely on qualitative interviews with 30 Ger…

Sociotechnical systembusiness.industryComputer scienceCommunicationmedia_common.quotation_subject05 social sciencesInternet privacy050801 communication & media studiesLibrary and Information SciencesTransparency (behavior)0506 political sciencePresentation0508 media and communicationsPerception050602 political science & public administrationSelection (linguistics)The InternetInternet usersbusinessAutonomymedia_common
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Effectiveness of a new method of disinfecting the root canal, using Er, Cr:YSGG laser to kill Enterococcus faecalis in an infected tooth model.

2013

Some lasers have demonstrated to provide effective disinfection when used as adjunctive device to the conventional treatment. The aim of this in vitro study was to determine the effectiveness of the erbium, chromium:yttrium scandium gallium garnet (Er, Cr:YSGG) laser by measuring its bactericidal effect inside the root canal experimentally colonized with Enterococcus faecalis. The laser was tested at different irradiation times (30 and 60 s) and energy of impulses (75 and 25 mJ). A total of 52 single-rooted extracted human teeth were endodontically prepared with rotary instrumentation. All were sterilized and inoculated with a suspension of E. faecalis (105 bacteria/ml). The teeth were rand…

Sodium HypochloriteRoot canalRoot canalsDentistryDermatologyIrradiation timeLasers Solid-StateDental CariesEnterococcus faecalislaw.inventionchemistry.chemical_compoundSettore MED/28 - Malattie OdontostomatologichelawmedicineEnterococcus faecalisHumansIrradiationTooth RootGram-Positive Bacterial InfectionsPeriodontal Diseasesbiologybusiness.industryLasersbiology.organism_classificationLaserBactericidal effectModels DentalE. faecaliRoot Canal TherapyDisinfectionEr Cr:YSGG lasermedicine.anatomical_structurechemistrySodium hypochloriteSurgeryRotary instrumentationDental Pulp CavitybusinessNuclear chemistryDisinfectantsErbiumLasers in medical science
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