Experimental investigation on free surface vortices driven by tangential inlets

Particle Image Velocimetry (PIV) measurements have been carried out in order to analyze the structure of free surface vortices in a promoting geometry with two tangential inlets. Velocity fields associated to the free surface vortex have been obtained at different horizontal planes and Reynolds numbers. Average velocity fields have been calculated and tangential velocity profiles have been compared at different vortex stages and measurement planes. The results show that tangential flow is uniform along the vortex axis and it scales well with the average exit velocity. The tangential velocity profiles, in comparison to the potential behavior, show discrepancies especially at large distances from the vortex axis. Vorticity fields and circulation profiles have been also derived from the measured velocity fields and discussed. The circulation profiles increase along the vortex radius even at large distances from the vortex axis, so that the potential solution is not applicable at all. The comparison of tangential velocity and circulation profiles between promoted and free vortices, the last presented in a previous paper, shows that the tangential motion in a driven vortex is more intense and predominant over the sink effect (radial motion), except very close to the tank bottom, as in a forced configuration (i.e. rotating cylindrical tank)

The proximity of distance education

[EN] The Institute for Educational Technologies (ITD) in Genoa, part of Italy’s National Research Council (CNR) has long held high-quality on-site training and refresher courses for teachers that are recognized by Italy’s Ministry of Education and Research (MIUR). In addition to participating in face-to-face initiatives, Italy’s teachers are increasingly exploiting opportunities to participate in certified online training initiatives. These are especially popular as they permit teachers a high degree of autonomy and flexibility in managing their learning. Since September 2014, ITD-CNR has been testing and implementing innovative training methods (mostly on behalf of a large Italian public research organization). These include webinars, which make it possible to reach large numbers of participants. ITD-CNR has also designed and made available a series of open courses designed to help teachers develop the skills needed to enhance classroom integration of students with disabilities, specific learning disabilities, and other special educational needs. These courses also address the use of technologies and strategies for more effective school inclusion. To ensure these training proposals remain usable over time and continue to provide relevant content, in 2016 ITD-CNR created an online platform called Essediquadro Training (https://sd2.itd.cnr.it/corsiformazione). This aggregates and makes available five open courses that are free of charge, totalling 130 hours of high-quality, certified training.In the past two years, the platform has attracted over 9000 registered users (pre- and in-service teachers), and has become a focal point for similar training initiatives launched by schools and universities, who are integrating their own training courses with those on offer from Essediquadro Training. In this contribution, we illustrate the characteristics and contents of the Essediquadro Training platform, examine the use of webinars for teacher training, and offer some considerations based on results of satisfaction questionnaires compiled by platform users.Caruso, GP.; Ferlino, L. (2019). The proximity of distance education. En INNODOCT/18. International Conference on Innovation, Documentation and Education. Editorial Universitat Politècnica de València. 45-67. https://doi.org/10.4995/INN2018.2018.8775OCS456

Accessibilit? del software didattico: un problema ancora non risolto.

Abstract not availabl

WikiMindMap: non solo online

no abstractUtilizzando WikiMindMap, uno strumento che nasce per fare ricerche su wiki online (Wikipedia) e visualizzarne i contenuti sotto forma di mappa mentale, ci siamo posti una domanda: "E\u27 possibile usarlo localmente, offline, su wiki personali?" Un\u27analisi attenta ci ha permesso di dare una risposta affermativa. Se dal punto di vista didattico tale possibilit? accresce le potenzialit? di questo strumento, dal punto di vista tecnico la necessit? di saper mettere le mani "nel" software pu? essere un ostacolo, per molti insormontabile. Queste considerazioni sono state lo spunto per la realizzazione di una guida alla procedura d\u27installazione (oggetto di questo contributo) che desideriamo condividere, in linea con la filosofia del sapere condiviso che ? alla base del software libero

[email protected]: nuove tecnologie open source per una Scuola che integra

no abstractQuesto contributo presenta il frutto della sinergia fra mondo della scuola e della ricerca: [email protected], l\u27ultima versione del dvd live della collana So.di.Linux. Si tratta di uno strumento che, come i precedenti, ha l\u27ambizione di diffondere l\u27Open Source nel mondo educational e avvicinare i ragazzi ad un approccio cooperativo dell\u27apprendere, questa volta in maniera ancora pi? determinata, dal momento che la scelta dei programmi presenti ? stata condivisa da docenti, studenti, e ricercatori

Investigation on bathtub vortex flow field by Particle Image Velocimetry

An experimental investigation on bathtub vortices has been performed by using Particle Image Velocimetry (PIV). Velocity fields associated to the free surface vortex were obtained at three horizontal planes and four Reynolds numbers, i.e. between 2400 and 11000 (calculated with reference to the exit hole diameter and the mean exit velocity). Due to the unsteady behavior of the low field, the vortex center positions have been identified and the vortex paths were reconstructed for all experiments. Average velocity fields have been calculated by aligning the vortex centers at each frame, in order to derive radial and tangential velocity profiles, to be compared at different Reynolds numbers and measurement planes. The results show that the radial motion assumes a potential behavior when it is near the exit hole, scaling quite well with the average exit velocity (thus with the corresponding Reynolds number). On the other hand, the tangential component is well approximated by the Rankine’s flow potential solution only near the free surface, the tangential velocity peak increment not being linearly proportional to the outlet velocity. Vorticity fields and circulation profiles have been derived from the measured velocity fields and discussed. Turbulence fluctuations statistical analysis gives also evidence of a clear dependence on Reynolds number and distance from the exit hole

Kinetics of Rhodopsin Deactivation and Its Role in Regulating Recovery and Reproducibility of Rod Photoresponse

The single photon response (SPR) in vertebrate phototransduction is regulated by the dynamics of R* during its lifetime, including the random number of phosphorylations, the catalytic activity and the random sojourn time at each phosphorylation level. Because of this randomness the electrical responses are expected to be inherently variable. However the SPR is highly reproducible. The mechanisms that confer to the SPR such a low variability are not completely understood. The kinetics of rhodopsin deactivation is investigated by a Continuous Time Markov Chain (CTMC) based on the biochemistry of rhodopsin activation and deactivation, interfaced with a spatio-temporal model of phototransduction. The model parameters are extracted from the photoresponse data of both wild type and mutant mice, having variable numbers of phosphorylation sites and, with the same set of parameters, the model reproduces both WT and mutant responses. The sources of variability are dissected into its components, by asking whether a random number of turnoff steps, a random sojourn time between steps, or both, give rise to the known variability. The model shows that only the randomness of the sojourn times in each of the phosphorylated states contributes to the Coefficient of Variation (CV) of the response, whereas the randomness of the number of R* turnoff steps has a negligible effect. These results counter the view that the larger the number of decay steps of R*, the more stable the photoresponse is. Our results indicate that R* shutoff is responsible for the variability of the photoresponse, while the diffusion of the second messengers acts as a variability suppressor

The effects of surgical preparation techniques and implant macro-geometry on primary stability : an in vitro study

The attainment of a good primary stability is a necessary condition to ensure the success of osseointegration in implantology. In type IV cancellous bone, however, it is possible that a reduced primary stability can lead to an increased rate of failure. The aim of this study was therefore to determine, with the help of the resonance frequency (Osstell mentor), which technique of implant site preparation (piezo surgery, conventional, under-preparation, bone compaction, osteodistraction) and macro-geometry is able to improve implant stability in type IV cancellous bone. 10 pig ribs were prepared with a surgical pre-drilled guide, calibrated for a correct implant positioning. On each rib, 5 implant sites (one for each technique) were prepared. Successively, 50 conical implants (Tekka Global D) were inserted and measured with the resonance frequency to evaluate the primary stability. Data collected were analyzed by analysis of variance (ANOVA) to test whether the Implant Stability Quotient (ISQ) values of the five techniques were significantly different. The results showed that no significant differences among the ISQ values of the five techniques used were found. Also, no significant differences in the macro-geometry of the two types of compared implants were observed. However, the macro-geometry of Tekka implants, characterized by a double condensing thread, seems to provide greater ISQ values than those of single thread implants when using the same technique. In light of these preliminary data, it is conceivable that in cases of reduced stability, such as those occurring with a type IV bone, all means ameliorating the primary stability and accelerating the osseointegration can be utilized

Early Recovery of Aphasia through Thrombolysis: The Significance of Spontaneous Speech

Aphasia in one of the most devastating stroke-related consequences for social interaction and daily activities. Aphasia recovery in acute stroke depends on the degree of reperfusion after thrombolysis or thrombectomy. As aphasia assessment tests are often time-consuming for patients with acute troke, physicians have been developing rapid and simple tests. The aim of our study is to evaluate the improvement of language functions in the earliest stage in patients treated with thrombolysis and in nontreated patients using our rapid screening tes

Systematic modeling of electrostatics, transport, and statistical variability effects of interface traps in end-of-the-roadmap III–V MOSFETs

Thanks to their superior transport properties, indium gallium arsenide (InGaAs) metal-oxide-semiconductor field-effect transistors (MOSFETs) constitute an alternative to conventional silicon MOSFETs for digital applications at ultrascaled nodes. The successful integration of this technology is challenged mainly by the high defect density in the gate oxide and at the interface with the semiconductor channel, which degrades the electrostatics and could limit the potential benefits over Si. In this work, we: 1) establish a systematic modeling approach to evaluate the performance degradation due to interface traps in terms of electrostatics and transport of InGaAs dual-gate ultrathin body (DG-UTB) FETs and 2) investigate the effects of random interface-trap concentration as another roadblock to the scaling of the technology, due to statistical variability of the threshold voltage. Variability is assessed with a Technology CAD (TCAD) simulator calibrated against multi-subband Monte Carlo (MSMC) simulations. The modeling approach overcomes the TCAD limitations when dealing with ultrathin channels (i.e., below 5 nm) without altering crucial geometrical parameters that would compromise the dependability of the variability analysis. Our results indicate that interface-trap fluctuation becomes comparable with the other variability sources dominating the total variability when shrinking the device dimensions, thus contrasting the trend of reduced variability with scaling. This, in turn, implies that interface and border traps may strongly limit the benefits of InGaAs over Silicon if not effectively reduced by gate process optimization