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We show that for a positive linear operator acting in ℓ2 and defined from anxn+1 + bn xn + an-1xn-1 its so-called Friedrichs and Krein extensions may be explicitly characterized by boundary conditions as n → ∞.

The Stieltjes-Wigert polynomials, which correspond to an indeterminate moment problem on the positive half-line, are eigenfunctions of a second order q-difference operator. We consider the orthogonality measures for which the difference operator is symmetric in the corresponding weighted L2-spaces. Under some additional assumptions these measures are exactly the solutions to the q-Pearson equation

The chromosomes of 13 primary and 4 secondary Rous sarcomas (RSV–SR) in the rat have been studied in fixations directly from the tumour. The general character of the chromosomal spectrum in the primary sarcomas was similar to that of the Rous sarcomas in the mouse and the Chinese hamster. However, normal diploid stemlines were considerably more frequent in the rat sarcomas; among the heteroploid s

The chapter examines the environmental impacts of car sharing (CS) by synthesising insights from literature, fieldwork and empirical research. While most studies highlight direct effects such as reduced greenhouse gas emissions and decreased private car ownership, this chapter emphasises the importance of exploring indirect environmental implications, including changes in disposable income and con

The doctoral period is often described as a linear path, omitting the human dimensions of becoming a scholar. In this volume, the imaginary of the PhD education in Sweden is expanded through the metaphor of the PhD wanderer— an early-career academic venturing into unknown terrains, sometimes becoming lost, at other times finding exciting directions, committing to new routes, and encountering new t

Background: In a previous study, we explored real-world programmed death-ligand 1 (PD-L1) testing and treatment patterns for patients with advanced non-small cell lung cancer (NSCLC) in the era of immune-oncology. The present study aimed to investigate overall survival (OS) with PD-(L)1 inhibitors with longer-term follow-up in the Swedish setting. Materials and methods: Data were extracted from th

The paper explores what the methodological considerations are for a study of educational practice and networked learning in technologically dense classrooms. The approach of the discussed study is informed by Actor-Network Theory (ANT) (Latour, 2005) and the paper outlines the methodological consequences for adopting principles associated with ANT and post-humanist critiques of representational ep

The accumulation of heavy metals in soils, often resulting from socio-economic development, poses a significant environmental challenge. Metallic elements can be adsorbed by organic matter and minerals in the soil, eventually accumulating in river sediments. This study aims to assess the extent of metal contamination in the sediments of the El Maleh River and its estuary in the Mohammedia region o

Balloon borne frost-point hygrometers and backscatter sondes were launched at Sodankylä, Finland in January and February of 1996. These instruments measure water vapor and the backscatter ratio of light due to polar stratospheric clouds in the Arctic stratospheric vortex. Here we report the results of a hygrometer sonde and a backscatter sonde launched within 3.5 hours of each other on January 22/

Reactions of the primary pyridine radicals, ortho-, meta-, and para-pyridyls with oxygen control the overall rate of pyridine oxidation. In the present work, the potential energy surfaces of o-, m-, and p-pyridyls + O2 previously developed by the authors have been employed for a systematic theoretical kinetic study of the rate constants of these reactions. The geometries of reactants, products, in

A central assumption in neuroscience is that learning mechanisms are conserved across species. Eyeblink conditioning, a cornerstone paradigm for studying associative learning and cerebellar function, has been widely used in humans and animal models alike. Yet direct cross-species comparisons remain rare. In this systematic review, we analyzed 484 eyeblink conditioning experiments reported in 271 s

The thesis discusses the licensing system of the Creative Commons from the perspective of the theory of the commons mostly as formulated by Elinor Ostrom. The work starts by describing the concepts and theory of common pool resources and regime of the commons for production and distribution of these resources. The main characteristics for successful traditional commons – efficiency, equity and sus

Existing studies on China’s COVID-19 response have gravitated to a macro-level,formal institutional analysis, focusing either on the effectiveness of the policy in early stage virus containment or on the growing negative impacts of COVID policy practices on China’s socio-political landscape at the late stage. Using serial interviewsaccompanied by online observations and documents, this thesis redi

Abstract in DanishMan har ikke kunne undgå at høre om the Belt and Road Initiative (BRI), One Belt, One Road, eller Den Nye Silkevej, som et af Xi Jinpings og Kinas vigtigste projekter bliver kaldt.Sammen med Tabita Rosendahl, Sinolog og PhD-studerende ved Lund Universitet, der forsker i netop BRI, dykker vi ned i Kinas Belt and Road Initiative.Hør om baggrunden for BRi, hvorfor det er vigtigt for

Integrating learning-based techniques, especially reinforcement learning, into robotics is promising for solving complex problems in unstructured environments. Most of the existing approaches rely on training in carefully calibrated simulators before being deployed on real robots, often without real-world fine-tuning. While effective in controlled settings, this framework falls short in applicatio

Trajectory planning under kinodynamic constraints is fundamental for advanced robotics applications that require dexterous, reactive, and rapid skills in complex environments. These constraints, which may represent task, safety, or actuator limitations, are essential for ensuring the proper functioning of robotic platforms and preventing unexpected behaviors. Recent advances in kinodynamic plannin

To study the mechanisms of relapse in KMT2A-rearranged (KMT2A-r) acute lymphoblastic (ALL) and acute myeloid leukemia (AML), we performed whole-genome and exome sequencing of infants and children with relapsed ALL/AML (n = 36), and longitudinal deep-sequencing of 257 samples in 30 patients. Somatic alterations in drug-response genes, most commonly in TP53 and IKZF1 (64%), were highly enriched in e