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We prove that polynomial calculus (and hence also Nullstellensatz) over any field requires linear degree to refute that sparse random regular graphs, as well as sparse Erdős-Rényi random graphs, are 3-colourable.
We prove that unary Sherali-Adams requires proofs of size nΩ(d) to rule out the existence of an nΘ(1)-clique in Erdős-Rényi random graphs whose maximum clique is of size d ≤ 2 log n. This lower bound is tight up to the multiplicative constant in the exponent. We obtain this result by introducing a technique inspired by pseudo-calibration which may be of independent interest. The technique involves
How is peace research connected to practice? Observers have argued that peace research has gone from activist, political ideals about changing the world to being a methods-driven field of research that has lost all criticality. This article adds empirical substance to the debate by investigating the case of Nordic peace research and its relationship to practice. Through interview data with more th
Metal powder is a promising carbon-free and recyclable energy carrier. Direct combustion of the micron-sized iron particles involves complex physical and chemical processes, such as heat transfer, surface reaction, and phase change. In this work, computational modelling of these processes is investigated and validated against experiments. A single iron particle combustion and phase change model is
Introduction: With the rapid development of treatment modalities for obesity management, there is a growing need for guidelines. This was acknowledged by the Swedish National Board of Health and Welfare and in 2020 the process of producing the first national guidelines for obesity care, including both children and adults, was initiated. The main aim was to ensure equal high standard care throughou
BACKGROUND: It is well-known that infectious complications after central venous catheterisation are associated with increased mortality, length of hospital stay and costs. However, there are limited data regarding such associations for immediate insertion-related complications. Therefore, the aim of this study was to investigate whether major immediate insertion-related complications are associate
AbstraktNukleärmedicinska metoder vid schizofreniDen kliniska användningen av nukleära metoder startade på 1970-talet med studier av hjärnblodflödet i Lund med David Ingvars och Franzéns användning av Xenon-133 och buntar av enskilda detektorer.Införandet av SPECT med Teknetium-99m radiofarmaka som t.ex. 99mTc-HMPAO förenklade proceduren och man kunde undersöka sambanden mellan rCBF, psykopatologiAfter initial studies in the years 1960-62 in chemistry, mathematics andphysics, my scientific career in medical imaging began in 1963. My qualificationsin chemistry then came in handy when the Nordics' first gamma camera installedin Lund. Around the same time, the discovery of a radioactive isotope of a newelement Technetium-99m showed suitable for use with the gamma camera.My task became to prod
The results of thermodynamic modeling of superhard materials based on cubic boron nitride (cBN) with a tantalum nitride (TaN) binder and additions of aluminum, as well as microfibers of various physicochemical nature (oxide (Al2O3, Mg2B2O5) and non-oxide (SiC, Si3N4)), are presented. The theoretically calculated chemical interactions between the components of superhard composite materials are expe
Striving to mitigate climate change, the European Union has adopted net-zero greenhouse gas emissions as a target for 2050. In this paper, European chemical industry roadmaps from the past six years are assessed and compared to uncover how the industry envisions its role in the transition to net-zero emissions. The roadmaps are assessed in terms of ambition level, technology and feedstock strategi
Jag vill undvika monopol för kollektivavtalet – eller för någon annan form av avtal, skriver Lars Jonung i ett svar på Håkan Bengtssons krönika.Hur ska den svenska modellen se ut? Ska den vara en korporativistisk modell där organiserade särintressen, parterna med andra ord, i kollektiva förhandlingar bestämmer hyror och löner för sina medlemmar? Eller ska det vara en liberal modell där rätten att
TV-program på Axess i serien Luthersson läser världslitteraturen. Mortensen inbjuden gäst för samtal om den argentinska författaren Jorge Luis Borges. Programmet beständigt tillgängligt: https://www.axess.se/tv/luthersson-laser-varldslitteraturen/om-jorge-luis-borges-med-anders-mortensen/
Background: Happiness is often conceptualized as subjective well-being, which comprises people's evaluations of emotional experiences (i.e., the affective dimension: positive and negative feelings and emotions) and judgements of a self-imposed ideal (i.e., the cognitive dimension: life satisfaction). Recent research has established these two dimensions as primary parts of a higher order factor. Ho
The role of psychological processes in team sports has been studied extensively. The chapter focuses on the psychological factors that are unique to basketball. These factors include the following: (a) free throw shooting—examining the role of gaze behavior in enhancing shooting percentages, (b) “the hot hand”—the underlying mechanisms leading to a “hot streak,” (c) clutch performance under pressu
This study aimed at exploring whether 3D technology enhances tennis decision-making under the conceptual framework of human performance model. A 3 (skill-level: varsity, club, recreational) × 3 (experimental condition: placebo, weak 3D [W3D], strong 3D [S3D]) between-participant design was used. Allocated to experimental conditions by a skill-level stratified randomization, 105 tennis players judg
