Search results for "Device"

400– to 1000–nm imaging spectrometer based on acousto-optic tunable filters

2004

An imaging spectrometer covering the 400-1000 nm band has been conceived and developed. The system is based on an Acousto-Optic Tunable Filter (AOTF) attached to a high performance digital camera. The AOTF permits the selection of spectral bands with an RF signal in the range of 70-210 MHz. The range is covered using two transducers attached to a single crystal. Although the idea is not new it covers a broader spectrum than previous systems. It includes a telecentric optical system that enhances system efficiency, by ensuring that the chief ray of each light cone emerges out of this doublet parallel to the optical axes. Additionally, an smart choice of integration time reduces the dependenc…

PROCEDIMENTO DI PREPARAZIONE DI SCAFFOLD POLIMERICI PREANGIOGENIZZATI

2009

A Lightweight Network Discovery Algorithm for Resource-constrained IoT Devices

2019

Although quite simple, existing protocols for the IoT suffer from the inflexibility of centralized infrastructures and require several configuration stages. The implementation of these protocols is often prohibitive on resource-constrained devices. In this work, we propose a distributed lightweight implementation of network discovery for simple IoT devices. Our approach is based on the exchange of symbolic executable code among nodes. Based on this abstraction, we propose an algorithm that makes even IoT resource-constrained nodes able to construct the network topology graph incrementally and without any a priori information about device positioning and presence. The minimal set of executab…

Uptake of chlorohydrocarbons from soil by lipid-containing semipermeable membrane devices (SPMDs)

1998

Chlorohydrocarbons (CHCs) were surveyed in contaminated lake shore soil in Central Finland with polyethylene membranes containing synthetic triolein (SPMDs). High levels of hexachlorobenzene (HCBz) and PCBs were found in a significant number of the SPMDs exposed 28 days to 35 soil sampling locations along the 350 meter long shoreline. Distributions of HCBz and PCBs were different as demonstrated by two maximas of HCBz and four maximas of PCBs observed. Soil was also analyzed at selected locations for concentrations of CHCs, organic carbon (OC) and moisture. Steady state environmental fate modeling and simple equilibrium partition estimates based on analytical results both gave the same stea…

A Compact SPICE Model for Organic TFTs and Applications to Logic Circuit Design

2016

This work introduces a compact DC model developed for organic thin film transistors (OTFTs) and its SPICE implementation. The model relies on a modified version of the gradual channel approximation that takes into account the contact effects, occurring at nonohmic metal/organic semiconductor junctions, modeling them as reverse biased Schottky diodes. The model also comprises channel length modulation and scalability of drain current with respect to channel length. To show the suitability of the model, we used it to design an inverter and a ring oscillator circuit. Furthermore, an experimental validation of the OTFTs has been done at the level of the single device as well as with a discrete-…

An Augmented Campus Design for Context-aware Service Provision

2005

This paper deals with the design of a multi-modal system for pervasive context-aware service provision and human-environment interaction in augmented environments by the use of Personal Digital Assistants (PDA) or SmartPhones. The system enables mobile devices and remote displays to perform as interaction devices with pervasive applications which run on a dynamically composed server network. Visual interaction for service setup and provision are driven by appropriate graphical interfaces and XML-based protocols, which are dynamically composed according to the type of service and to the user current position by means of a mobile agent-based framework. The paper discusses both protocols, hard…

Representació gràfica i ècfrasi en l’obra de Ramon Llull

2016

El present treball estudia la relació que s’estableix entre text i representacions gràfiques en les obres de Ramon Llull, fent una atenció especial al recurs retòric anomenat ècfrasi, això és, la descripció verbal d’un objecte visual. S’analitzen casos de descripció de figures lul·lianes, sobretot esquemes arboris, en presència de la seva representació (ècfrasi referencial) o en absència de la mateixa (ècfrasi nocional). Es conclou que la dimensió material de les figures i l’assimilació mental del seu funcionament són elements cabdals del procés d’elevació cognitiva que proposa Llull This article discusses the relation established between texts and graphic representations in works of Ramon …

Development of new strategies for the design of in situanalysis devices: nano and biomaterials

2021

La Tesis describe el concepto de análisis in situ y biomateriales que han dado lugar al desarrollo de varios dispositivos de análisis in situ. Estos dispositivos se basan principalmente en la inmovilización de reactivos en soportes sólidos. Se han empleado nano y (bio) materiales en el desarrollo de varios (bio) sensores o kits. Para el desarrollo de los dispositivos se consideraron los siguientes dos puntos críticos: i) la selección de los materiales de soporte donde tiene lugar la inmovilización de los reactivos, ii) la reacción involucrada en el procedimiento. Es importante estudiar la reacción entre el material y los reactivos para comprender la liberación del reactivo a la disolución o…

A DGS gesture dictionary for modelling on mobile devices

2017

ABSTRACTInteractive or Dynamic Geometry System (DGS) is a tool that help to teach and learn geometry using a computer-based interactive environment. Traditionally, the interaction with DGS is based on keyboard and mouse events where the functionalities are accessed using a menu of icons. Nevertheless, recent findings suggest that such a traditional model of interaction has a steep learning curve and is inadequate to develop DGS for devices with multi-touch screens. Thus, we propose a new interaction model for DGS based on a gesture dictionary which enables the construction and manipulation of geometric objects without the need of accessing a menu of icons. The dictionary is divided into thr…

Embedding the Remote Application Control: Visual API for PDA Programming

2009

PDAs are more and more used as advanced adaptive HEI (human-environment interaction) interfaces, thus enabling their users to easily operate applications remotely running in pervasive computing scenarios. Based on a previous implementation, in this paper we discuss the development of a new set of .NET-compliant Application Programming Interfaces to be used within the Visual Studio IDE. Our main goal is to provide programmers with a set of components to be used with the common drag-and-drop operation, in order to embed a remote application control within an application running on the PDA and vice-versa. The interaction relies on ad-hoc communication protocols over a framework devoted to pair…