1,721,475 research outputs found
A new portable chest drainage device
No full textBackground. persistent air leak is a frequent complication in lung operation. The Heimlich valve is the standard system for venting the pleural cavity. The device achieves good results and is well tolerated, but the main problem is when air leak is associated with fluid leakage. Methods. In order to improve the outpatient management of persistent air and fluid drainage after resectional procedures, we developed an original device. It is a portable system provided with a one-way valve connected to the chest tube for drainage of air and fluid, a reservoir for collecting fluid, and a one-way exhaust valve to evacuate air from the bag. Results. We analyze the advantages of our device versus the Heimlich valve in the first series of 18 selected patients. Our system is drier and cleaner, easier to manage, and ambulatory visits are seldom needed. There is also a cost savings. Conclusions. Our device enhances ambulation, independence, and the quality of life of the patients, and decreases the need for hospital and outpatient care
Cohomologically Full Rings
No full textInspired by a question raised by Eisenbud–Mustaţă–Stillman regarding the injectivity of maps from Ext modules to local cohomology modules and the work by the third author with Pham, we introduce a class of rings, which we call cohomologically full rings. This class of rings includes many well-known singularities: Cohen–Macaulay rings, Stanley–Reisner rings, F-pure rings in positive characteristics, and Du Bois singularities in characteristics 0. We prove many basic properties of cohomologically full rings, including their behavior under flat base change. We show that ideals defining these rings satisfy many desirable properties, in particular they have small cohomological and projective dimension. When R is a standard graded algebra over a field of characteristic 0, we show under certain conditions that being cohomologically full is equivalent to the intermediate local cohomology modules being generated in degree 0. Furthermore, we obtain Kodaira-type vanishing and strong bounds on the regularity of cohomologically full graded algebras
F-signature function of quotient singularities
No full textWe study the shape of the F-signature function of a d-dimensional quotient singularity k〚x1,...,xd〛G, and we show that it is a quasi-polynomial. We prove that the second coefficient is always zero and we describe the other coefficients in terms of invariants of the finite acting group G⊆Gl(d,k). When G is cyclic, we obtain more specific formulas for the coefficients of the quasi-polynomial, which allow us to compute the general form of the function in several examples
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