Search results for "Mask"
showing 10 items of 506 documents
Morphological exponential entropy driven-HUM.
2006
This paper presents an improvement to the Ex- ponential Entropy Driven - Homomorphic Unsharp Masking (E 2 D − HUM ) algorithm devoted to illumination artifact sup- pression on Magnetic Resonance Images. E 2 D−HUM requires a segmentation step to remove dark regions in the foreground whose intensity is comparable with background, because strong edges produce streak artifacts on the tissues. This new version of the algorithm keeps the same good properties of E 2 D − HUM without a segmentation phase, whose parameters should be chosen in relation to the image. I. INTRODUCTION Most of the studies on illumination correction found in literature are oriented to brain (18) magnetic resonance images (…
Il Polar prima del Polar: il poliziesco italo-americano tra fine Ottocento e gli anni Trenta del Novecento
2018
Tra la fine dell’Ottocento e gli anni Trenta del Novecento, alcuni Italiani immigrati negli Stati Uniti – quali, fra gli altri, Bernardino Ciambelli, Italo Stanco, Garibaldi Marto Lapolla, Louis Forgione, nonché il sodalizio letterario costituito da Michael Fiaschetti e Prosper Buranelli – si sono cimentati nel genere del poliziesco con alcuni testi che, partendo da alcune delle caratteristiche tipiche del Mystery, quali la serializzazione e l’incardinamento della fabula in uno specifico contesto urbano, insieme ad alcuni degli elementi caratteriali dei personaggi dell’Hard boiled non perdono mai di vista la peculiare ‘missione’ di denuncia politica, economica e sociale. Facendo del problem…
How common is isolated nocturnal hypertension?
2020
The growing use of methods to measure blood pressure (BP) under everyday life conditions in ‘out-of-office’ settings, through either 24-h ambulatory BP monitoring (ABPM) or home BP monitoring (HBPM), for defining BP status has led to identification of four specific hypertension phenotypes, characterized by variable agreement or disagreement between office BP (OBP) and out-of-office BP: true normotension (normal office and out-of-office BP), sustained hypertension (both elevated office and out-of-office BP), masked hypertension (normal office BP and out-of-office BP), and white-coat hypertension (WCH), when OBP is elevated, but out-of-office BP levels are within normal limits. The term ‘whit…
High efficacy of face masks explained by characteristic regimes of airborne SARS-CoV-2 virus abundance
2021
Abstract Airborne transmission is an important transmission pathway for viruses, including SARS-CoV-2. Regions with a higher proportion of people wearing masks show better control of COVID-19, but the effectiveness of masks is still under debate due to their limited and variable efficiencies in removing respiratory particles. Here, we analyze experimental data and perform model calculations to show that this contrast can be explained by the different regimes of abundance of particles and viruses. Because of the large number of particles exhaled during human respiration and vocalization, indoor environments are usually in a particle-rich regime which means that masks cannot prevent the inhal…
Fabrication of Electrical Contacts on Pyramid-Shaped NTD-Ge Microcalorimeters Using Free-Standing Shadow Masks
2011
In our effort to fabricate arrays of germanium microcalorimeters for X-ray detection, a truncated square-based pyramid shape has been identified as a suitable geometry for the sensors. It allows to obtain a uniform current spreading across each sensor, and represents a good compromise between having a large support area for the radiation absorber and for maintaining an overall small bolometer volume. This three-dimensional geometry, however, does not allow to create the electrical contacts for the sensors using a regular photoresist-based lift-off metallization process. In this paper we show how to deposit metal contacts on the lateral faces of the pyramidal sensors by metal evaporation thr…
Maschere e imagerie teatrale nella necropoli liparese di IV-III sec. a.C.: oggetti e immagini in contesto
2019
A new contextual analysis is proposed in order to reappraise the well known theatrical images from Lipari. In the wake of the researches made by L. Bernabò Brea and M. Cavalier, the clay masks of comic, satyric and tragic characters and figurines, on one hand, and the “theatrical” vases on the other were reputed to echo or to “illustrate” Greek plays, in the frame of a Dionysian cult. Lastly, A. Schwarzmaier reviewed this thesis, pointing at the ritual context in which the masks were used and deposed in a set of drinking and pouring vases near the grave during the burial, and concluding that they were a visual clue of a Dionysian funerary banquet. Examining again the whole evidence (masks,…
Triple-target stimuli-responsive anti-COVID-19 face mask with physiological virus-inactivating agents
2021
Conventional face masks to prevent SARS-CoV-2 transmission are mostly based on a passive filtration principle. Ideally, anti-COVID-19 masks should protect the carrier not only by size exclusion of virus aerosol particles, but also be able to capture and destroy or inactivate the virus. Here we present the proof-of-concept of a filter mat for such a mask, which actively attracts aerosol droplets and kills the virus. The electrospun mats are made of polycaprolactone (PCL) a hydrophilic, functionalizable and biodegradable polyester, into which inorganic polyphosphate (polyP) a physiological biocompatible, biodegradable and antivirally active polymer (chain length, ∼40 Pi units) has been integr…
Vīriešu - feministu vīrišķības interpretācijas
2015
Bakalaura darbs „Vīriešu – feministu vīrišķības interpretācijas” mēģina noskaidrot, kā vīrieši, kas sevi dēvē par feministiem, piedēvē nozīmes vīrišķībai. Darbā skaidrotas vīrišķībai piešķirtās nozīmes, vīrišķības izpratnes saistība ar feminismu un kā vīrišķības izpratnes atklājas ikdienas praksēs. Kā darba teorētiskais ietvars izmantota Reivinas Koneles maskulinitātes teorija, to papildinot ar citu pētnieku darbiem un simboliskā interakcionisma perspektīvu. Darbā izmantotas kvalitatīvās pētījumu metodes, veicot sešas daļēji strukturētas intervijas un iegūtos datus analizējot ar kvalitatīvās kontentanalīzes metodes. Rezultāti atklāj, ka vīrišķības nozīme pētījuma dalībnieku dzīvē nav izteik…
ICA of full complex-valued fMRI data using phase information of spatial maps.
2015
Background ICA of complex-valued fMRI data is challenging because of the ambiguous and noisy nature of the phase. A typical solution is to remove noisy regions from fMRI data prior to ICA. However, it may be more optimal to carry out ICA of full complex-valued fMRI data, since any filtering or voxel-based processing may disrupt information that can be useful to ICA. New method We enable ICA of the full complex-valued fMRI data by utilizing phase information of estimated spatial maps (SMs). The SM phases are first adjusted to properly represent spatial phase changes of all voxels based on estimated time courses (TCs), and then these are used to segment the voxels into BOLD-related and unwant…