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Search Results: 1 - 10 of 33 matches for " Lucina Rempulska "
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The Voronovskaya theorem for some operators of the Szasz-Mirakjan type
Lucina Rempulska,Mariola Skorupka
Le Matematiche , 1995,
Abstract: We give the Voronovskaya theorem for some operators of the Szasz-Mirakjan type defined in the space of functions continuous on [0,+infinity) and having the polynomial grouth at infinity. Some approximation properties of these operators are given in [2], [4].
On truncated MKZ and Baskakov operators
L. Rempulska
International Journal of Mathematical Analysis , 2012,
Abstract:
On strong approximation by modified Meyer-K"onig and Zeller operators
L. Rempulska,M. Skorupka
Tamkang Journal of Mathematics , 2006, DOI: 10.5556/j.tkjm.37.2006.123-130
Abstract: We introduce certain modified Meyer-K"onig and Zeller operators $ M_{n;r} $ in the space of $r $-th times differentiable functions $ f $ and we study strong differences $ H_{n;r}^q(f) $ for them. This note is motivated by results on strong approximation connected with Fourier series ([7]).
Approximation properties of certain modified Szasz-Mirakyan operators
Lucyna Rempulska,Zbigniew Walczak
Le Matematiche , 2000,
Abstract: We introduce certain modified Szasz - Mirakyan operators in exponential weighted spaces of functions of one variable. We give theorems on the degree of approximation and the Voronovskaya type theorem.
On Szasz-Mirakyan operators of functions of two variables
Lucyna Rempulska,Mariola Skorupka
Le Matematiche , 1998,
Abstract: We consider Szasz-Mirakyan operators in polynomial and exponential weighted spaces of functions of two variables. We give Voronowskaya type theorem and theorem on convergence of certain sequences.
Resting-State fMRI and Developmental Systems Neuroscience
Lucina Q. Uddin
Frontiers in Neuroscience , 2011, DOI: 10.3389/fnins.2011.00014
Abstract:
Orthodromic Atrioventricular Reciprocating Tachycardia in a Dalmatian  [PDF]
Marlos G. Sousa, Stephany B. Lucina, Roberta Carareto
Open Journal of Veterinary Medicine (OJVM) , 2018, DOI: 10.4236/ojvm.2018.81001
Abstract: Supraventricular tachyarrhythmias may be caused by macroreentry circuits involving the AV node and accessory pathways. This paper reports a case of suspected orthodromic atrioventricular reciprocating tachycardia in an 18-month-old Dalmatian admitted with dyspnea and a lifelong history of fatigue. Cardiac auscultation documented a regular fast pace with no heart murmurs. The electrocardiogram characteristics were consistent with supraventricular tachycardia, with very regular RR interval and narrow QRS complexes. At lead II, we identified negative P waves buried within the ST segment, which resulted in a RP-to-PR ratio of 0.60, but in aVR these P waves were positive, suggesting a retrograde conduction of electrical impulses throughout the atrial myocardium. The echocardiographic study showed volume overload, and a decreased fractional shortening was calculated when SVT was sustained, highlighting its impact on systolic function. This is likely the first description of an orthodromic atrioventricular reciprocating tachycardia in a Dalmatian, and although cardiac mapping was not available to confirm this suspicion, all electrocardiograpic features were supportive of such arrhythmia.
Introduction to Special Topic – Resting-State Brain Activity: Implications for Systems Neuroscience
Lucina Q. Uddin,Vinod Menon
Frontiers in Systems Neuroscience , 2010, DOI: 10.3389/fnsys.2010.00037
Abstract:
The Picard and the Gauss-Weierstrass singular integrals of functions in two variables
K. Bogalska,E. Gojtka,M. Gurdek,L. Rempulska
Le Matematiche , 1997,
Abstract: We study some approximation properties of the Picard and the Gauss-Weierstrass singular integrals of functions of two variables belonging to some exponential weighted spaces. In Sec. 3.1 and 3.2 we give two theorems on the degree of approximation and two theorems of the Voronovskaya type. In Sec. 3.3 the Bernstein inequalities for these singular integrals are proved. Some similar results for the Picard and the Gauss-Weierstrass singular integral of functions of one variable were given in [1] - [3].
Typical and atypical development of functional human brain networks: insights from resting-state fMRI
Lucina Q. Uddin,Kaustubh Supekar,Vinod Menon
Frontiers in Systems Neuroscience , 2010, DOI: 10.3389/fnsys.2010.00021
Abstract: Over the past several decades, structural MRI studies have provided remarkable insights into human brain development by revealing the trajectory of gray and white matter maturation from childhood to adolescence and adulthood. In parallel, functional MRI studies have demonstrated changes in brain activation patterns accompanying cognitive development. Despite these advances, studying the maturation of functional brain networks underlying brain development continues to present unique scientific and methodological challenges. Resting-state fMRI (rsfMRI) has emerged as a novel method for investigating the development of large-scale functional brain networks in infants and young children. We review existing rsfMRI developmental studies and discuss how this method has begun to make significant contributions to our understanding of maturing brain organization. In particular, rsfMRI has been used to complement studies in other modalities investigating the emergence of functional segregation and integration across short and long-range connections spanning the entire brain. We show that rsfMRI studies help to clarify and reveal important principles of functional brain development, including a shift from diffuse to focal activation patterns, and simultaneous pruning of local connectivity and strengthening of long-range connectivity with age. The insights gained from these studies also shed light on potentially disrupted functional networks underlying atypical cognitive development associated with neurodevelopmental disorders. We conclude by identifying critical gaps in the current literature, discussing methodological issues, and suggesting avenues for future research.
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