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Search Results: 1 - 10 of 11423 matches for " Rafael Paya "
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Recent progress and open questions on the numerical index of Banach spaces
Vladimir Kadets,Miguel Martin,Rafael Paya
Mathematics , 2006,
Abstract: The aim of this paper is to review the state-of-the-art of recent research concerning the numerical index of Banach spaces, by presenting some of the results found in the last years and proposing a number of related open problems.
On the intrinsic and the spatial numerical range
Miguel Martin,Javier Meri,Rafael Paya
Mathematics , 2005,
Abstract: For a bounded function $f$ from the unit sphere of a closed subspace $X$ of a Banach space $Y$, we study when the closed convex hull of its spatial numerical range $W(f)$ is equal to its intrinsic numerical range $V(f)$. We show that for every infinite-dimensional Banach space $X$ there is a superspace $Y$ and a bounded linear operator $T:X\longrightarrow Y$ such that $\bar{co} W(T)\neq V(T)$. We also show that, up to renormig, for every non-reflexive Banach space $Y$, one can find a closed subspace $X$ and a bounded linear operator $T\in L(X,Y)$ such that $\bar{co} W(T)\neq V(T)$. Finally, we introduce a sufficient condition for the closed convex hull of the spatial numerical range to be equal to the intrinsic numerical range, which we call the Bishop-Phelps-Bollobas property, and which is weaker than the uniform smoothness and the finite-dimensionality. We characterize strong subdifferentiability and uniform smoothness in terms of this property.
Convexity and smoothness of Banach spaces with numerical index one
Vladimir Kadets,Miguel Martin,Javier Meri,Rafael Paya
Mathematics , 2008,
Abstract: We show that a Banach space with numerical index one cannot enjoy good convexity or smoothness properties unless it is one-dimensional. For instance, it has no WLUR points in its unit ball, its norm is not Frechet smooth and its dual norm is neither smooth nor strictly convex. Actually, these results also hold if the space has the (strictly weaker) alternative Daugavet property. We construct a (non-complete) strictly convex predual of an infinite-dimensional $L_1$ space (which satisfies a property called lushness which implies numerical index~1). On the other hand, we show that a lush real Banach space is neither strictly convex nor smooth, unless it is one-dimensional. In particular, if a subspace $X$ of the real space $C[0,1]$ is smooth or strictly convex, then $C[0,1]/X$ contains a copy of $C[0,1]$. Finally, we prove that the dual of any lush infinite-dimensional real space contains a copy of $\ell_1$.
Complications during pharmacological stress echocardiography: a video-case series
Albert Varga, Giuliano Kraft, Ferenc Lakatos, Riccardo Bigi, Rafael Paya, Eugenio Picano
Cardiovascular Ultrasound , 2005, DOI: 10.1186/1476-7120-3-25
Abstract: We decided to present a case collection of severe complications during pharmacological stress echo testing, including a ventricular tachycardia, cardiogenic shock, transient ischemic attack, torsade de pointe, fatal ventricular fibrillation, and free wall rupture.We believe that, in this field, every past complication described is a future complication avoided; what happens in your lab is more true of what you read in journals; and Good Clinical Practice is not "not having complications", but to describe the complications you had.The safety of the stress test is a major issue in deciding its practicability and cost-effectiveness – yet, many major complications remain "unmentioned and unheard", for several reasons – mainly related to the "file drawer" bias, lack of time ("busy agenda bias") or unfamiliarity with the technicalities of scientific communication (editorial "black box bias").Stress echocardiography is a cost-effective tool for the modern noninvasive diagnosis of coronary artery disease [1]. Several physical and pharmacological stresses are used in combination with echocardiographic imaging, usually exercise, dobutamine and dipyridamole. The safety of a stress is (or should be) a major determinant in the choice of testing. Although large scale single center experiences and multicenter trial information are available for both dobutamine and dipyridamole [2-6] stress echo testing, complications or side effects still can occur even in the most experienced laboratories with the most skilled operators. We believe that, in this field, every past complication described is a future complication avoided; what happens in your lab is more true than what you read in journals; and Good Clinical Practice is not "not having complications", but to describe the complications you had. Therefore, we decided to present an unusual case series, consisting in a collection of severe complications during pharmacological stress echo testing.A 73 year-old male patient, with a previo
Septal rupture with right ventricular wall dissection after myocardial infarction
Carlos J Soriano, José L Pérez-Boscá, Sergio Canovas, Francisco Ridocci, Pau Federico, Ildefonso Echanove, Rafael Paya
Cardiovascular Ultrasound , 2005, DOI: 10.1186/1476-7120-3-33
Abstract: We present a case of a 59-year-old man who had a septal rupture with right ventricular wall dissection after inferior and right ventricular myocardial infarction. Transthoracic echocardiography, as first line examination, established the diagnosis, and prompt surgical repair allowed long-term survival in our patient.Outcomes after right ventricular intramyocardial dissection following septal rupture related to myocardial infarction has been reported to be dismal. Early recognition of this complication using transthoracic echocardiography at patient bedside, and prompt surgical repair are the main factors to achieve long-term survival in these patients.The occurrence of ventricular septal rupture after acute myocardial infarction is an uncommon complication in the reperfusion era [1], however, this condition implies a high mortality rate, even after surgical repair [2]. In patients with inferior myocardial infarction, septal rupture generally involves basal inferoposterior septum, and the communicating tract between left and right ventricle is often serpiginous with a variable degree of right ventricular wall extension [3]. Right ventricular wall dissection following septal rupture related to previous myocardial infarction has been reported in a very few cases [4-6], in many of them this condition has been diagnosed in post-mortem studies [4]. In a recent report long-term survival has been achieved after promptly echocardiographic diagnosis and surgical repair [6].A 59-year-old man was admitted to Coronary Care Unit because of suspected ST-segment-elevation myocardial infarction. The patient was complaining of typical coronary chest pain during the last twelve hours. He had a history of dyslipidemia, type 2 diabetes mellitus, smoking habit and a transient ischemic attack without any sensitive or motor squele one year ago. On admission, his blood pressure was 100/60 and heart rate was 110 beats per minute. Cardiac examination revealed jugular vein distension, and no s
Psycho-medical aspects on migrants health of III? world pediatric surgical patients  [PDF]
Andreas Fette, Kurosh Paya, Istvan Szilard
Health (Health) , 2011, DOI: 10.4236/health.2011.32019
Abstract: The constantly expanding world wide mobility and globalization within the pediatric community puts new demands on pediatric surgical health care systems worldwide. Forcing carers to pay attention not only on their best surgical and medical performance like in the past. In contrary, they are forced to pay much more attention on psycho-medical aspects like finance, rehabilitation, socialization and integration, culture, management and logistics, health edu-cation and language skills. Then, according to our opinion these aspects should be considered as Post Traumatic Stress Disorder (PTSD)-like syndrome and treated accordingly. Then handling this problem succesfully, would be essential for the future survival of any health care system.
La consagración de la primavera y el nacimiento de la música contemporánea europea
Ernesto Paya G
Revista chilena de infectología , 2009,
Abstract:
El Tango
Ernesto Paya G
Revista chilena de infectología , 2009,
Abstract:
Rapa Nui y la lepra Rapa Nui and Laepra
Ernesto Paya G
Revista chilena de infectología , 2009,
Abstract:
BUDA
Ernesto Paya G
Revista chilena de infectología , 2008,
Abstract:
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