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Report on the key comparison, CCM.F-K23 in force at 200 N and 500 N
Full text linkThe working group force of the CCM decided to make a comparison at 200 N and 500 N at the meeting held in Kajaani in November 2014. At the meeting held in Braunschweig in June 2017 it was decided that METAS would be the pilot of this comparison. The working group agreed that the transfer standard would be independently organized by each participating laboratory according to the principle "bring your own device". This solution would reduce the work needed by the pilot and would allow for a faster conclusion of the comparison. The participants have been chosen according to their actual CMC and to the expected uncertainty of their reference system
4D Printing of Multifunctional Devices Induced by Synergistic Role of Magnetite and Silver Nanoparticles in Polymeric Nanocomposites
Full text linkEmerging as a revolutionary strategy to fabricate dynamic three dimesional (3D) structures, 4D printing (4DP) mainly refers to printed materials capable of changing form over time when exposed to a predetermined stimulus. Nevertheless, the 4D concept can be extended beyond shape-morphing, by including also changes in the properties and/or functionalities of printed materials over time. To this end, this work explores the 4DP of multifunctional nanocomposites that can adapt to different application scenarios exploiting the stimuli-activable properties of two functional nanofillers embedded into the polymeric matrix. In particular, a photocurable system loaded with both Fe3O4 nanoparticles (NPs) and AgNO3, as precursors for the in situ photo-induced generation of Ag NPs, is used for the digital light processing of magnetic nanocomposites with integrated electrical and antibacterial functions. The composition of formulations is designed to both optimize their printability and maximize the magneto-responsiveness and the electrical conductivity and/or antibacterial activity of the printed objects, given by Fe3O4 and Ag NPs, respectively. Finally, it is shown that the functional responses of the nanocomposites can be activated individually or in combination, which may be of particular interest for the fabrication of smart multifunctional devices with potential applications ranging from soft electronics to biomedicine.4D printed multifunctional polymeric magneto-electric and magneto-antibacterial devices are fabricated employing vat photopolymerization 3D printing, exploiting the properties of both Fe3O4 embedded and in situ generated Ag nanoparticles. The functional responses of such materials can be successfully activated individually or synergistically, envisaging potential applications from soft electronics to biomedicine. imag
Principali interventi effettuati per la rimessa in funzione del gravimetro assoluto IMGC-02
No full textA seguito di alcuni malfunzionamenti che hanno causato il fermo del gravimetro assoluto
IMGC-02 e alla normale usura di alcuni componenti, si sono resi necessari diversi interventi
sia a livello hardware che a livello software per il ripristino e miglioramento del suo
funzionamento. Tale documento ha lo scopo di creare una memoria dei recenti interventi
effettuati a partire dal 2021 nell’ottica di facilitare gli interventi futuri anche da parte di
persone diverse dagli scriventi.
L’intervento principale ha riguardato la sostituzione dello chassis del PXI contenente il
modulo CPU deputato alla gestione dell’intero sistema mediante il software LabView® che
presentava arresti anomali in fase di elaborazione dei dati di lancio. Si è reso necessario un
lungo lavoro di ricerca “storica” di driver e versioni del software LabView® che garantisse la
compatibilità ed il supporto di tutti i componenti hardware vecchi e relativamente nuovi, ma
non più supportati da parte del costruttore. Anche il ripristino di alcune librerie Fortran® ha
richiesto un notevole impegno in quanto il sistema operativo più recente utilizzabile è
risultato essere Windows XP®.
Sono stati inoltre effettuati numerosi interventi a livello meccanico, elettrico e software per
rendere l’operatività del sistema più affidabile, robusta e orientata all’utilizzo in campo. Tra
gli interventi principali effettuati vi sono: sostituzione guide a ricircolo di sfere del sistema di
lancio, correzione configurazione driver del motore brushless per la movimentazione del
carrello di carico, rinnovo dei cablaggi, saldature e inserimento calze di schermatura,
inserimento di un extra-corsa elettrico e miglioramento dell’extra-corsa meccanico di arresto
del carrello di lancio (per evitare la messa fuori uso del sistema di lancio per perdita sfere).
Inoltre: sono state acquistate (con relativa scorta) nuove finestre ottiche e migliorata la
relativa sede, si sono introdotti distanziali di protezione per la finestra ottica della campana
in vuoto, caratterizzata e monitorata nel tempo l’unità di controllo del laser Winters M100 e
sostituito il tubo laser dell’unità interferometrica (trattato in un RT a parte).
Infine: riprogettato il sistema di movimentazione carrelli, eliminate le interferenze nel braccio
del sismometro (con conseguente blocco), sviluppati SW per monitoraggio e
movimentazione indipendente delle parti del gravimetro e sensori, migliorato il software di
gestione (introdotti e riorganizzati in maniera più intuitiva indicatori e campi inserimento dati),
migliorato SW analisi GravisoftPP (riorganizzando in maniera più sinergica le informazioni
necessarie), risigillati gli accoppiamenti campana vuoto-flange di fissaggio.
A seguito del ripristino completo della funzionalità dello strumento, è stato possibile
partecipare alle attività previste dal progetto PRIN 2020FR2JHF ed al confronto
internazionale EURAMET.M.G-K2.2023 tenutosi a Wettzell lo scorso giugno 2024
Sensing microscopic noise events by frequent quantum measurements
Full text linkWe propose and experimentally demonstrate a general method allowing us to unravel microscopic noise events that affect a continuous quantum variable. Such unraveling is achieved by frequent measurements of a discrete variable coupled to the continuous one. The experimental realization involves photons traversing a noisy channel. There, their polarization, whose coupling to the photons’ spatial wave packet is subjected to stochastic noise, is frequently measured in the quantum Zeno regime. The measurements not only preserve the polarization state, but also enable the recording of the full noise statistics from the spatially resolved detection of the photons emerging from the channel. This method proves the possibility of employing photons as quantum noise sensors and robust carriers of information
LA TOMOGRAFIA A RESISTENZA ELETTRICA DI MATERIALI IN FILM SOTTILE: ATTIVITÀ IN INRIM E INTERAZIONE CON CONSORZI DI RICERCA
Full text linkCombination of US hyperthermia and radiotherapy on a preclinical glioblastoma model
Full text linkIn this work the effect of combining ultrasound (US) hyperthermia (HT) with radiotherapy (RT) was investigated. The treatment was applied to a GBM xenograft nude mouse model obtained by injecting 2×106 U87 luc+ cells. The combined treatment group received 6 Gy and HT at 43∘ for 8 min. The ultrasound field was generated by a closed-loop computationally controlled system, consisting of a High Intensity Focused Ultrasound (HIFU) transducer with centre frequency 3.57 MHz, a power amplifier, a function generator and a MATLAB controller. A mechanical cone adaptor has been designed to use the HIFU beam at a pre-defined post-focal distance. Two thermocouples were placed between the mechanical cone and the mice skin to measure and control the temperature during the HT treatment. Radiotherapy was carried out by using a dedicated small animal image guided radiotherapy system. Measurements of tumor volume performed with a caliper showed good tumor control for the RT-HT group with respect to the RT or control groups for up to 21 days after treatment. The mean value of the normalized (before therapy) tumor volume was almost equal to 0.5 for two weeks after treatment with an increase to 1.5 at sacrifice. The control and HT groups showed a higher value of about 1.5 during the first two weeks and 3.5 at the end of the follow-up period. We concluded that the use of HT as a radiosensitizer can improve the outcome for glioblastoma treatments
Riunione della ISO/TC213 Dimensional and Geometrical Product Specification and Verification – Teddington (GB), 2024-03-04/15
Full text linkDall’ultima relazione pubblicata su Probing 30, si sono tenute due riunioni della ISO/TC 213: a Teddington oggetto di questa relazione, e a Cracovia (PL) 2023-09-14/27. Siccome i progetti normativi sono incrementali, questa relazione riguarderà solo l’ultima riunione e le novità più recenti
Dual-responsive magnetic nanodroplets for controlled oxygen release via ultrasound and magnetic stimulation
Full text linkMagnetic oxygen-loaded nanodroplets (MOLNDs) are a promising class of nanomaterials dually sensitive to ultrasound and magnetic fields, which can be employed as nanovectors for drug delivery applications, particularly in the field of hypoxic tissue treatment. Previous investigations were primarily focused on the application of these hybrid systems for hyperthermia treatment, exploiting magnetic nanoparticles for heat generation and nanodroplets as carriers and ultrasound contrast agents for treatment progress
monitoring. This work places its emphasis on the prospect of obtaining an oxygen delivery system that can be activated by both ultrasound and magnetic fields. To achieve this goal, Fe3O4 nanoparticles were employed to decorate and induce the magnetic vaporization of OLNDs, allowing oxygen release. We present an optimized method for preparing MOLNDs by decorating nanodroplets made of diverse fluorocarbon cores and polymeric coatings. Furthermore, we performed a series of characterizations for better understanding how magnetic decoration can influence the physicochemical properties of OLNDs. Our comprehensive analysis demonstrates the efficacy of magnetic stimulation in promoting oxygen release compared to conventional ultrasound-based methods. We emphasize the critical role of selecting the appropriate fluorocarbon core and polymeric coating to optimize the decoration process and enhance the oxygen release performance of MOLNDs
Uncertainty in discrete-time integration — The case of static gas meters
Full text linkWe consider the evaluation of uncertainty in a particular case of discrete-time integration, i.e., that of static gas meters. We show that the current approach, which does not take correlations into account, can lead to underrating of the uncertainty associated with the estimate of the delivered volume. Now, a correct evaluation of uncertainty in the case e.g. of online measurements along large offshore pipelines is important in order to remove technical barriers to international trade.
We focus our discussion on the practical example of gas meters, but the framework of uncertainty evaluation we provide is valid in general for all those measurements involving discrete-time integration, and has therefore a wide applicability