1,354,874 research outputs found
How i do it: Lung ultrasound
No full textIn the last 15 years, a new imaging application of sonography has emerged in the clinical arena: lung ultrasound (LUS). From its traditional assessment of pleural effusions and masses, LUS has moved towards the revolutionary approach of imaging the pulmonary parenchyma, mainly as a point-of-care technique. Although limited by the presence of air, LUS has proved to be useful in the evaluation of many different acute and chronic conditions, from cardiogenic pulmonary edema to acute lung injury, from pneumothorax to pneumonia, from interstitial lung disease to pulmonary infarctions and contusions. It is especially valuable since it is a relatively easy-to-learn application of ultrasound, less technically demanding than other sonographic examinations. It is quick to perform, portable, repeatable, non-ionizing, independent from specific acoustic windows, and therefore suitable for a meaningful evaluation in many different settings, both inpatient and outpatient, in both acute and chronic conditions.In the next few years, point-of-care LUS is likely to become increasingly important in many different clinical settings, from the emergency department to the intensive care unit, from cardiology to pulmonology and nephrology wards. © 2014 Gargani and Volpicelli; licensee BioMed Central Ltd
I&I - Cryptocurrency with Gian Volpicelli
No full textThis week is our April edition of Incentives and Instincts, a monthly series in which I speak with economist and friend, Bryce Ward, about some of the broader issues facing our society.
In this conversation we cover cryptocurrency: what is it and what do you need to know about it? To help answer these questions, we are joined by Gian Volpicelli, senior writer at WIRED and author of Cryptocurrency: How Digital Money Could Transform Finance.https://scholarworks.umt.edu/anewangle_podcasts/1240/thumbnail.jp
Convex rearrangement: equality cases in the Pòlya-Szegö inequality
No full textIt is known that for any nonnegative function u compactly supported in R^n ∫(H(Du))^2 dx≥∫(H(Du^*))^2 dx where H is a nonnegative convex function, positively homogeneous of degree 1 and u^* is the "convex" rearrangement of u with respect to H. We deal with the problem of characterizing those functions u for which equality holds
Polar factorization and pseudo-rearrangements:applications to Polya-Szego type inequalities
No full textWe are interested in the polar factorization of a function f defined in an open bounded subset of R^N. It is well known that there exists a measure preserving map s such that f = f*o s where f* is the decreasing rearrangement of f. We prove that, under suitable assumptions, besides the classical polar factorization of f we have f = f_u o s where f_u is a pseudo-rearrangement of f with respect to the measurable function u and s is the measure preserving map such that u = u* o s. As an application, we characterize those functions that realize equality in the Polya-Szego inequality
Minimal rearrangements of Sobolev functions : a new proof
No full textWe give an alternative proof of a theorem by Brothers and Ziemer concerning extremal functions in the Pólya–Szegö rearrangements inequality for Dirichlet type integrals
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