Results 71 to 80 of about 73,803 (304)
Essential norms of some singular integral operators [PDF]
Archiv der Mathematik, 1999 Let \(S\) be a singular integral operator on the unit circle \(T\). The author calculates the essential norm \(\|S_{a,b}\|_e\) in \(L^2(T)\) of the singular integral operator \(S_{a,b}=aP+bQ\), where \(P=\frac 12 (I+S), Q=\frac 12 (I-S)\) are projections in \(L^2(T)\) and \(a,b \in L^\infty(T)\). Theorem. Let \(a,b \in L^\infty (T)\). Then \[ \|S_{a,b}\
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Pediatric Blood &Cancer, EarlyView.ABSTRACT Bone tumours present significant challenges for affected patients, as multimodal therapy often leads to prolonged physical limitations. This is particularly critical during childhood and adolescence, as it can negatively impact physiological development and psychosocial resilience.
Jennifer Queisser +5 more
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On the Norm of Certain Weighted Composition Operators on the Hardy Space
Abstract and Applied Analysis, 2009 We obtain a representation for the norm of certain compact weighted composition operator 𝐶𝜓,𝜑 on the Hardy space 𝐻2, whenever 𝜑(𝑧)=𝑎𝑧+𝑏 and 𝜓(𝑧)=𝑎𝑧−𝑏. We also estimate the norm and essential norm of a class of noncompact weighted composition operators ...
M. Haji Shaabani, B. Khani Robati
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The essential norm of multiplication operators on $L_p(��)$
, 2022 We show that the formula for the essential norm of a multiplication operator on $L_p$, for ...
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Therapeutic Apheresis and Dialysis, EarlyView.ABSTRACT Background The delipid extracorporeal lipoprotein filter from plasma (DELP) treatment can effectively reduce blood lipid, increase blood flow, and improve neurological deficits in patients with acute ischemic stroke (AIS). However, its effect on vision and retinal microcirculation in stroke patients has never been reported.
Ning Li +9 more
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Abstract and Applied Analysis, 2014 In this note we express the norm of composition followed by differentiation DCφ from the logarithmic Bloch and the little logarithmic Bloch spaces to the weighted space Hμ∞ on the unit disk and give an upper and a lower bound for the essential norm of ...
Shanli Ye
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Therapeutic Apheresis and Dialysis, EarlyView.ABSTRACT Introduction Cognitive impairment and exercise intolerance are common in dialysis patients. Cerebral perfusion and oxygenation play a major role in both cognitive function and exercise execution; HD session per se aggravates cerebral ischemia in this population. This study aimed to compare cerebral oxygenation and perfusion at rest and in mild
Marieta P. Theodorakopoulou +10 more
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Revealing the structure of land plant photosystem II: the journey from negative‐stain EM to cryo‐EM
FEBS Letters, EarlyView.Advances in cryo‐EM have revealed the detailed structure of Photosystem II, a key protein complex driving photosynthesis. This review traces the journey from early low‐resolution images to high‐resolution models, highlighting how these discoveries deepen our understanding of light harvesting and energy conversion in plants.
Roman Kouřil
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Boundedness and essential norm of an integral-type operator on a Hilbert–Bergman-type spaces
Journal of Inequalities and Applications, 2019 Let D ${\mathbb {D}} $ be the open unit disk of the complex plane C ${\mathbb {C}} $ and H(D) $H({\mathbb {D}} )$ be the space of all analytic functions on D ${\mathbb {D}} $.
Stevo Stević, Zhi-Jie Jiang
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Erratum to Essential norm of weighted composition followed and proceeded by differentiation operator from Bloch-type into Bers-type spaces, Operators and Matrices, 15 (3) (2021), 853-870 [PDF]
, 2022 Hamid Vaezi, Mohamad Naghlisar
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