1,721,020 research outputs found
IIoT-based Motion Control Efficiency in Automated Warehouses
Full text linkThe Industrial Internet of Thing (IIoT) approach to an Industry plant design, devises a comprehensive interconnection of the system components, from sections up to single devices, in order to get a general and punctual understanding of the process. Such an intelligent network, mostly based on Ethernet layers, when properly conceived, should be able to add relevant value to the plant operation. In industrial economy, the more significant implementation of IIoT comes with the Industry 4.0 (I4) principles. This paper shows how, within the I4 and IIoT frame, the plant efficiency can be addressed and bring relevant improvement. The reason is that measured or calculated variables, directly related to the energy consumption, such as current, electric power, actuator and motor torque, speed, etc., can be timely and easily monitored in the entire plant, since they are already conveyed on the communication network, due to real time control and diagnostics purpose. The paper, after a general discussion, proves it with practical examples based on Intralogistics applications: a Gantry robot and the stacker cranes of an automated warehouse, both driven in an EtherCAT based automation network
Enhanced photoluminescence of organic dyes embedded in sol-gel organosilane thin films
Full text linkWe investigated photoluminescence properties of Dyomics dyes DY650 and DY831 when incorporated into solid thin films fabricated using two distinct sol–gel precursors, namely, tetraethoxysilane (TEOS) and 3-glycidoxypropyltrimethoxysilane (GPTMS). Surprisingly, a significant enhancement in both photoluminescence lifetime and quantum yield was observed in the films derived from GPTMS, contrasting conventional behavior documented in literature for dyes dispersed within solid matrices. This phenomenon is attributed to the unique molecular environment surrounding the dyes in the GPTMS matrix, which was inferred to suppress nonradiative decay channels for the photoexcited dyes. Our findings provide valuable insights into the intricate interplay between dye molecules and their host matrices, shedding light on the potential applications of GPTMS-based systems in enhancing photoluminescence properties for various technological advancements
Modelling of a Plasmonic Metasurface for Optical Sensing Applications by a Custom Particle Swarm Optimization Algorithm Implemented in the FDTD Method
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Fluorescence emission angular dependence on a nanostructured plasmonic grating
No full textPlasmonic gratings provide an advantageous platform for fluorescence sensing due to their compatibility with functionalization techniques, imaging detection, and the potential for signal enhancement. Among traditional fluorescence detection methods, microscopes are commonly used tools. The interaction between dye fluorescence processes and the plasmonic modes of the grating strongly depends on the measurement configuration and is influenced by the dispersion and spectral characteristics of the plasmonic modes. In our study, we investigated the angular behavior of the fluorescence emission from ATTO700 dye by varying the collection angle using a standard optical microscope coupled with a spectrometer. Our results show a clear dependence of fluorescence emission in terms of spectral shape on the collection angle that can be attributed to plasmonic mode dispersion
Electronic structure and Yb-valence in the Kondo lattices YbCu(4)M (M=Ag, Au, Pd, In)
No full textOptical reflectivity measurements over a wide spectral range and at different temperatures together with self consistent electronic FLAPW calculations within LDA have been used to investigate the electronic structure of the compounds. A remarkable agreement between theory and experiment has been found which allows for an interpretation of the origin of the different degree of f-d hybridization in these Yb-based materials
OPTICAL STUDY OF NIOBIUM DISILICIDE POLYCRYSTALLINE FILMS
No full textNbSi2 polycrystalline films, coevaporated and thermally annealed, were subjected to chemical and structural characterization, and then studied by reflectance from 0.06 to 6 eV and ellipsometry from 1.4 to 5 eV. The dielectric functions, obtained from Kramers-Kronig analysis and directly from ellipsometry, are also presented. Low-frequency free-carrier response is discussed in terms of the Drude model; the high-frequency interband structures are interpreted on the basis of the calculated density of states and photoemission results. A comparison is made with the optical properties of isoelectronic VSi2 and TaSi2 Polycrystalline films
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