Money Urbanism : progetto urbano e cicli di produzione della citt\ue0

Money Urbanism d\ue0 il titolo ad un\u2019esperienza didattica sul rapporto fra \u201cprogetto urbano e denaro\u201d all\u2019Universita\u300 Iuav di Venezia e, parallelamente, ha dato avvio ad una ricerca nel campo del progetto e degli strumenti di governo delle trasformazioni urbane che sperimentano l\u2019uso temporaneo, come strumento anti-ciclico rispetto all\u2019esaurirsi di cicli economici e conseguenti fenomeni di abbandono e dismissione di componenti urbane. A questo duplice percorso soggiace, pertanto, l\u2019idea, supportata pero\u300 da molti accadimenti di cronaca e da una ampia bibliografia disciplinare internazionale e nazionale, che il rapporto fra uso di risorse finanziarie e progetto di citta\u300 debba essere in qualche modo criticato, non per negarne l\u2019esistenza o l\u2019utilita\u300 e neppure per dichiararne una definitiva demonizzazione, ma per una necessaria evoluzione - se non proprio rivoluzione - che ridefinisca il ruolo non esclusivamente ancillare e che invece potrebbe dirsi ancora \u201cpolitico\u201d del progettare

High efficiency diode-pumped Pr:LiLuF4 visible lasers in femtosecond-laser-written waveguides.

[EN]In this work we investigate the power scaling of diode-pumped Pr:LiLuF4 waveguide lasers produced by direct femtosecond writing. The waveguides studied consisted in depressed cladding waveguides with different geometries. We observed laser emission at 604 nm, achieving a maximum output power of 275 mW and a slope efficiency of 40%, and 721 nm, demonstrating 310 mW of output power and a slope efficiency of 50%. Moreover, we obtained, what we believe is for the first time in a diode-pumped waveguide, laser emission at 523 nm, with a maximum output power of 65 mW and a slope efficiency of 11%. In the end, we also demonstrated the first diode-pumped operation of a single-transverse-mode waveguide laser at 721 nm, reaching a maximum output power of 28 mW and maintaining a high quality beam with an M2 of 1.1

A [68Ga]Ga-DOTANOC PET/CT radiomic model for non-invasive prediction of tumour grade in pancreatic neuroendocrine tumours

Predicting grade 1 (G1) and 2 (G2) primary pancreatic neuroendocrine tumour (panNET) is crucial to foresee panNET clinical behaviour. 51 patients with G1-G2 primary panNET demonstrated by pre-surgical [68Ga]Ga-DOTANOC PET/CT and diagnostic conventional imaging were grouped according to the tumour grade assessment method: histology on the whole excised primary lesion (HS) or biopsy (BS). First-order and second-order radiomic features (RFs) were computed from SUV maps for the whole tumour volume on HS. The RFs showing the lowest p-values and the highest Area Under the Curve (AUC) were selected. Three radiomic models were assessed: A (trained on HS, validated on BS), B (trained on BS, validated on HS), C (using the cross-validation on the whole dataset). The second-order Normalized homogeneity and Entropy was the most effective RFs couple predicting G2 and G1. The best performance was achieved by model A (test AUC=0.90, sensitivity=0.88, specificity=0.89), followed by model C (median test AUC=0.87, sensitivity=0.83, specificity=0.82). Model B performed worse. Using HS to train a radiomic model leads to the best prediction, although a “hybrid” (HS+BS) population performs better than biopsy-only. The non-invasive prediction of panNET grading may be especially useful in lesions not amenable to biopsy while [68Ga]Ga-DOTANOC heterogeneity might recommend FDG PET/CT

Visible waveguide laser in fluoride crystals

Today, lasers play a key role in many aspects of our society, from everyday life to scientific research. Some of these applications require a laser with wavelength in the visible range, from 400 to 750nm, and praseodymium ions are an interesting source for visible laser realization, possessing emission lines from 480nm to 720nm. Moreover, if embedded in fluorides, it possesses all the lines needed by strontium-based atomic clocks and does not have all the disadvantages of laser diodes today employed like encumbrance and frequency runaway. In particular, LiLuF4 showed better thermomechanical properties with respect to the more common LiYF4. A miniaturized source can be obtained by writing waveguides with femtosecond-long laser pulses. For the project of this thesis, femtosecond-written waveguides have been realized on Pr:LiLuF4. The writing procedure has been carried out by ALF group of University of Salamanca, which collaborate with us on this project. Waveguides have been characterized by transmission measurement, observing transmission losses of 0.12dB/cm, a value lower than all previously measured in waveguides written in fluorides. A waveguide laser has been obtained, for the first time in this material, which operation wavelengths are 604nm and 721nm. Moreover, laser operation at 698nm has been realized for the first time in a praseodymium-based waveguide laser

Is internet the cherry on top or a crutch? Offline social support as moderator of the outcomes of online social support on Problematic Internet Use

The study is part of a research whose goal is identifying what predictors determine either a positive or a dysfunctional use of Internet. The factor at stake is here social support. Specifically our study, carried out through an online questionnaire, hypothesized a moderation of Offline Social Support in the relationship between Online Social Support, Problematic Internet Use, and Life Satisfaction. The study found that while Offline Social Support reduces the chances of developing a Problematic Internet Use, Online Social Support increases them. Furthermore the data supported the moderation of Offline Social Support in the outcomes of Online Social Support: when the first is low, as the latter increases the Problematic Internet Use gets higher; when Offline Social Support is high, an increase in Online Social Support determines a decrease in Problematic Internet Use. By contrast the moderation of Offline Social Support on the relationship between Online Social Support and Life Satisfaction was not confirmed. Our research show that when investigating psychological constructs related to Internet activity these must be considered in their offline and online variations to provide an answer to the debate on psychological outcomes of undertaking social interactions in Internet land. Our results suggest that the usage of the Web may become dysfunctional when it is meant to compensate for lacks of the \u201coffline life\u201d

Diode-pumped visible lasing in femtosecond-laser-written Pr:LiLuF4 waveguide

In this Letter we report the realization of a femtosecond-laser-written diode-pumped Pr:LiLuF4 visible waveguide laser. The waveguide studied in this work consisted of a depressed-index cladding, whose design and fabrication were optimized to minimize the propagation loss. Laser emission has been achieved at 604 nm and 721 nm, with output power of 86 mW and 60 mW, respectively, and slope efficiencies of 16% and 14%. In addition, we obtained, for the first time in a praseodymium-based waveguide laser, sta-ble continuous-wave laser operation at 698 nm (3 mW of output power and 0.46% of slope efficiency), corresponding to the wavelength necessary for the clock transition of the strontium-based atomic clock. The waveguide laser emis-sion at this wavelength is mainly in the fundamental mode (i.e., the larger propagation constant mode) showing a nearly Gaussian intensity profile. (c) 2023 Optica Publishing Grou

Thermal analysis of diode-pumped femtosecond-laser-written Pr:LiLuF4 waveguide lasers

In this work we report a thermal stress test executed on high efficiency diode pumped waveguide lasers based on Pr:LiLuF4. 4 . Numerical simulations have been performed to estimate the core temperature. We demonstrated that no modifications in the output power, 275 mW at 604 nm and 310 mW at 721 nm, and in the bulk-level slope efficiency, 40% at 604 nm and 50% at 721 nm, have been observed with an estimated core temperature of 70 degrees C. We also executed stability measurements of the free running laser in thermally severe conditions, demonstrating output power fluctuations of mechanical origin as low as 10% of the peak value

A [68Ga]Ga-DOTANOC PET/CT Radiomic Model for Non-Invasive Prediction of Tumour Grade in Pancreatic Neuroendocrine Tumours

Predicting grade 1 (G1) and 2 (G2) primary pancreatic neuroendocrine tumour (panNET) is crucial to foresee panNET clinical behaviour. Fifty-one patients with G1-G2 primary panNET demonstrated by pre-surgical [68Ga]Ga-DOTANOC PET/CT and diagnostic conventional imaging were grouped according to the tumour grade assessment method: histology on the whole excised primary lesion (HS) or biopsy (BS). First-order and second-order radiomic features (RFs) were computed from SUV maps for the whole tumour volume on HS. The RFs showing the lowest p-values and the highest area under the curve (AUC) were selected. Three radiomic models were assessed: A (trained on HS, validated on BS), B (trained on BS, validated on HS), and C (using the cross-validation on the whole dataset). The second-order normalized homogeneity and entropy was the most effective RFs couple predicting G2 and G1. The best performance was achieved by model A (test AUC = 0.90, sensitivity = 0.88, specificity = 0.89), followed by model C (median test AUC = 0.87, sensitivity = 0.83, specificity = 0.82). Model B performed worse. Using HS to train a radiomic model leads to the best prediction, although a “hybrid” (HS+BS) population performs better than biopsy-only. The non-invasive prediction of panNET grading may be especially useful in lesions not amenable to biopsy while [68Ga]Ga-DOTANOC heterogeneity might recommend FDG PET/CT