Sökresultat
Filtrera
Filtyp
Din sökning på "*" gav 535696 sökträffar
Multiplicity dependence of σψ(2S)/σJ/ψ in pp collisions at √s = 13 TeV
The ratio of production cross-sections of ψ(2S) over J/ψ mesons as a function of charged-particle multiplicity in proton-proton collisions at a centre-of-mass energy s = 13 TeV is measured with a data sample collected by the LHCb detector, corresponding to an integrated luminosity of 658 pb−1. The ratio is measured for both prompt and non-prompt ψ(2S) and J/ψ mesons. When there is an overlap betwe
A measurement of ∆Γs
Using a dataset corresponding to 9 fb−1 of integrated luminosity collected with the LHCb detector between 2011 and 2018 in proton-proton collisions, the decay-time distributions of the decay modes Bs 0→J/ψη′ and Bs 0→J/ψπ+π− are studied. The decay-width difference between the light and heavy mass eigenstates of the Bs 0 meson is measured to be ∆Γs = 0.087 ± 0.012 ± 0.009 ps−1, where the first unce
Airborne SARS-CoV-2 in patient rooms during the Omicron wave compared to early variants
The covid-19 pandemic was characterized by a series of variants of concern, different strains of SARS-CoV-2 which had a serious impact on transmission. One of these, denoted Omicron, dominated in early 2022 and caused covid-19 cases to soar. The increased transmission during the Omicron wave triggered hospitals to further strengthen airborne precautions. The reason for this surge in cases during O
Measurement of associated J/ψ-ψ(2S) production cross-section in pp collisions at √s = 13 TeV
The cross-section of associated J/ψ-ψ(2S) production in proton-proton collisions at a centre-of-mass energy of (Formula presented.) TeV is measured using a data sample corresponding to an integrated luminosity of 4.2 fb−1, collected by the LHCb experiment. The measurement is performed for both J/ψ and ψ(2S) mesons having transverse momentum pT< 14 GeV/c and rapidity 2.0 < y < 4.5, assuming negligi
Limits of functions – university students’ concept development
Studenter lär sig gränsvärden
Students’ perceptions of limits
Limits and infinity – A study of university students’ performance revisited
Begreppsbildning i sociala sammanhang: Att analysera matematisk aktivitet på två nivåer
A framework to explore the role of mathematics during physics lessons in upper-secondary school
The interfaces of innovation in mathematics and the arts.
Emmer (1993) claimed creativity to be a bridge between art and mathematics exemplified (www. olats.org/colloque/textes/texte7.shtml) in his traveling exhibition The Eye of Horus: Art and Mathematics (Emmer, 1990). A shared language is needed to make bridges between science, art and metaphysics (Thiessen, 1998). Scientific phenomena and concepts need to be possible to isolate for better understandi
Unimaginable imagination and political commitment : A survey of the introduction and presence of the literature of the Latin American boom in Sweden in 1960–1990
This study investigates the publication and reception of the Latin American boom literature in Sweden from 1960 to 1990, focusing on Julio Cortázar, Carlos Fuentes, Gabriel García Márquez and Mario Vargas Llosa. It analyses the extent of Swedish translations of their works and the type and amount of attention they received in the Swedish press. Using a bibliometric approach for the translations, aThis study investigates the publication and reception of the Latin American boom literature in Sweden from 1960 to 1990, focusing on Julio Cortázar, Carlos Fuentes, Gabriel García Márquez and Mario Vargas Llosa. It analyses the extent of Swedish translations of their works and the type and amount of attention they received in the Swedish press. Using a bibliometric approach for the translations, a
Small Antenna Q and Gain – 80 Years of Progress
The understanding of small antennas has evolved tremendously since the initial investigations close to 80 years ago. In this presentation, we highlight some fundamental results on Q-factor, bandwidth, and gain.
Political innovation in African Nationalist Organisations (1880–1890)
The learning organisation: Conditions of possibility in a feminist NGO
Amidst criticism of the concept of “the learning organisation” there is a perspective which is both critical of, and open to, innovative ways of developing the notion of a learning organisation. This article contributes to this perspective by examining the learning practices of a feminist NGO which operates across Southern Africa. The ways in which this NGO has interpreted the idea of a learning o
Extensive Population Structure Highlights an Apparent Paradox of Stasis in the Impala (Aepyceros melampus)
Impalas are unusual among bovids because they have remained morphologically similar over millions of years-a phenomenon referred to as evolutionary stasis. Here, we sequenced 119 whole genomes from the two extant subspecies of impala, the common (Aepyceros melampus melampus) and black-faced (A. m. petersi) impala. We investigated the evolutionary forces working within the species to explore how th
Cytosolic serpins act in a cytoprotective feedback loop that limits ESX-1-dependent death of Mycobacterium marinum-infected macrophages
UNLABELLED: Serine protease inhibitors (serpins) constitute the largest family of protease inhibitors expressed in humans, but their role in infection remains largely unexplored. In infected macrophages, the mycobacterial ESX-1 type VII secretion system permeabilizes internal host membranes and causes leakage into the cytosol of host DNA, which induces type I interferon (IFN) production via the cy
Genomics of adaptive evolution in the woolly mammoth
Ancient genomes provide a tool to investigate the genetic basis of adaptations in extinct organisms. However, the identification of species-specific fixed genetic variants requires the analysis of genomes from multiple individuals. Moreover, the long-term scale of adaptive evolution coupled with the short-term nature of traditional time series data has made it difficult to assess when different ad
Introgression and disruption of migration routes have shaped the genetic integrity of wildebeest populations
The blue wildebeest (Connochaetes taurinus) is a keystone species in savanna ecosystems from southern to eastern Africa, and is well known for its spectacular migrations and locally extreme abundance. In contrast, the black wildebeest (C. gnou) is endemic to southern Africa, barely escaped extinction in the 1900s and is feared to be in danger of genetic swamping from the blue wildebeest. Despite t