Search results for "DUT"
showing 10 items of 583 documents
Museoparks and re‐enchantment of the museum visits: an approach centred on visual ethnology
2012
PurposeThe purpose of this paper is to identify the structural dimensions of a new museal offer, museoparks, which use edutainment and more generally re‐enchantment strategies.Design/methodology/approachTo bring out the symbolic dimensions specific to these cultural sites, the methodology used is based on the analysis of photographic media.FindingsThe analysis reveals four main symbolic dimensions structuring these hybrid cultural offers: spectacularization, immersive character, ritualized character, and very intense merchandizing of the experience.Research limitations/implicationsThis analysis allows us to update a hybrid, complex and re‐sized form of cultural experience that goes beyond t…
Enforcing mobile security with location-aware role-based access control
2013
This paper describes how location-aware role-based access control RBAC can be implemented on top of the Geospatial eXtensible Access Control Markup Language GeoXACML. It furthermore sketches how spatial separation of duty constraints both static and dynamic can be implemented using GeoXACML on top of the XACML RBAC profile. The solution uses physical addressing of geographical locations, which facilitates easy deployment of authorisation profiles to the mobile device. Location-aware RBAC can be used to implement location-dependent access control and also other security enhancing solutions on mobile devices, such as location-dependent device locking, firewall, intrusion prevention or payment…
Online measurement of floc size, viscosity, and consistency of cellulose microfibril suspensions with optical coherence tomography
2021
AbstractIn this study, cellulose microfibril (CMF) suspensions were imaged during pipe flow at consistencies of 0.4%, 1.0%, and 1.6% with optical coherence tomography (OCT) to obtain images of the structure and the local velocity of the suspension. The viscosities obtained by combining pressure loss measurement with the OCT velocity data showed typical shear thinning behavior and were in excellent agreement with viscosities obtained with ultrasound velocity profiling. The structural OCT images were used to calculate the radial and the axial floc sizes of the suspension. A fit of power law to the geometrical floc size–shear stress data gave the same power law index for all consistencies, sug…
Low Current Density Driving Leads to Efficient, Bright and Stable Green Electroluminescence
2013
Electroluminescent devices have the potential to reshape lighting and display technologies by providing low-energy consuming solutions with great aesthetic features, such as flexibility and transparency. In particular, light-emitting electrochemical cells (LECs) are among the simplest electro-luminescent devices. The device operates with air-stable materials and the active layer can be resumed to an ionic phosphorescent emitter. As a consequence, LECs can be assembled using solution-process technologies, which could allow for low-cost and large-area lighting applications in the future. High efficiencies have been reported at rather low luminances (<50 cd m(-2)) and at very low current densi…
Characterization of micro-fibrillated cellulose fiber suspension flow using multi scale velocity profile measurements
2017
Rheological properties and boundary layer flow behavior of Micro Fibrillated Cellulose (MFC) suspended in water was studied using a novel velocity profiling rheometric technique. The method is based on measuring stationary velocity profiles of fluid flow in a straight tube simultaneously by Doppler Optical Coherence Tomography (DOCT) and by Ultrasound Velocity Profiling (UVP). The high resolution DOCT provides velocity profiles near the transparent tube wall, while UVP yields corresponding information in the interior parts of the flow. The data from the two instruments is combined into a comprehensive velocity profile including both the thin boundary layer near the wall and the interior par…
A Test Circuit for GaN HEMTs Dynamic Ron Characterization in Power Electronics Applications
2019
Wide bandgap devices such as GaN HEMTs are a promising technology in the field of Power Electronics. Due to the physical properties of the Gallium nitride and the device design, they can outperform their Silicon counterparts for the design of highly efficient power switching converters. However, its design should face certain effects that can diminish its performance. One of such effect is the degradation mechanism known as dynamic onresistance (dynamic RON,), being its mitigation one of the main objectives in the design of the device. In this paper, a circuit is proposed for assessing if this effect is present in GaN transistors in power electronics applications. The circuit allows testing…
Silica masks for improved surface poling of lithium niobate
2005
Surface periodic poling of congruent lithium niobate was performed with the aid of photolithographically defined silica masks. The latter helped improving the control of duty cycle in the periodic domain poling, with 50:50 mark-to-space ratios. The role of silica was ascertained by numerically solving the Poisson equation.
Maximum Power Point Tracker for Standalone PV System Using Neural Networks
2019
In this work, designing and implementation of a maximum power point tracker (MPPT) based on an artificial neural network is proposed. The output voltage of the selected photovoltaic array is controlled by a DC to DC boost converter in a way that the PV array generates the available possible maximum power correspond to the available solar irradiance and temperature. The neural network (NN) is capable of forecasting the required terminal voltage of the PV array in order to generate the possible maximum power. The pulse width modulation (PWM) signal, which drives the boost converter, is generated through a raspberry pi according to the forecasted terminal voltage. The terminal voltage of the P…
Erämaan herrat ja orjat : vallantahto ja luonto Cormac McCarthyn romaanissa Blood Meridian
2011
Analysoin tutkielmassani Cormac McCarthyn vuonna 1985 ilmestynyttä romaania Blood Meridian. Lähestyn teoksen luontosuhdetta useista näkökulmista, joista keskeisin on Friedrich Nietzschen vallantahdon käsitteen mahdollistama. Tarkastelen tapoja, joilla teoksen kertoja kuvaa luontoa ja toisaalta henkilöhahmojen retorisia luonnon haltuunottoja, yleistyksiä ja retoriikkaa – vallantahdon ilmenemismuotoja. Näen romaanin esimerkkinä historiallisesta modernistisesta fiktiosta, jossa kuvataan nopean yhteiskunnallisen muutoksen ja väliaikaisen kaaostilan luomaa epävarmuutta. Tämä epävarmuus ulottuu teoksen kertojaan, joka on tietoinen siitä ettei kykene tavoittamaan objektiivista todellisuutta. Blood…
La Tecnologia. Struttura economica e produttività
2012
Il capitolo indaga l'evoluzione della struttura produttiva in 24 paesi del mediterraneo dal 1980 al 2010 e valuta come il cambiamento strutturale è associato a variazioni della produttività nei diversi paesi e settori. The chapter offers and inquiry into the evolution of the economic structure of 24 Mediterranean countries from 1980 to 2010 and examines how structural change is associated to productivity growth in different sectors and countries.