Results 21 to 30 of about 1,986 (170)

High-girth Steiner triple systems

Annals of Mathematics
We prove a 1973 conjecture due to Erdős on the existence of Steiner triple systems with arbitrarily high girth.
Kwan, Matthew, Sah, Ashwin, Sawhney, Mehtaab, Simkin, Michael   +3 more
openaire   +3 more sources

Halving Steiner triple systems

Discrete Mathematics, 1992
A halving of a Steiner triple system (STS) is a partition of its triples into two classes, so that the set of triples in each class are isomorphic as hypergraphs. If such an isomorphism is an automorphism of the STS, the halving is called strong. STS that can be strongly halved are shown to exist if and only if the order is 1 or 9 modulo 24.
Das, Pramod K., Rosa, Alexander
openaire   +1 more source

A Perspective of Multi‐Reflecting TOF MS

Mass Spectrometry Reviews, EarlyView.
ABSTRACT Time‐of‐flight mass spectrometry (TOF MS) excels in rapid and high‐sensitivity analysis, making it a cornerstone of analytical chemistry. But as sample complexity explodes in omics studies, so does the need for higher resolving power to ensure accurate results.
A. N. Verenchikov, V. V. Makarov, A. V. Vorobyev, S. N. Kirillov   +3 more
wiley   +1 more source

Cold EI—The Way to Improve GC‐MS and Increase Its Range of Applications

Mass Spectrometry Reviews, EarlyView.
ABSTRACT Gas chromatography‐mass spectrometry (GC‐MS) with Cold electron ionization (EI) is based on interfacing the GC and MS with a supersonic molecular beam (SMB) along with electron ionization of vibrationally cold sample compounds in the SMB in a contact‐free fly‐through ion source (hence the name Cold EI).
Aviv Amirav, Benny Neumark, Oneg Elkabets, Alex Yakovchuk   +3 more
wiley   +1 more source

Embedding Steiner triple systems into Steiner systems S(2,4,v)

Discrete Mathematics, 2004
A Steiner system \(S(t,k,v)\) \((V,{\mathcal B})\) is embedded in a Steiner system \(S(t',k',w)\) \((W,{\mathcal C})\) if \(V \subset W\) and \({\mathcal C}| V = {\mathcal B}\). So far the best studied examples of embeddings of Steiner systems are those when \(t = t' = 2\) or \(3\) and \(k = k' = 3\) or \(4\).
Meszka, Mariusz, Rosa, Alexander
openaire   +1 more source

Machine‐learning approaches for characterizing the raindrop size distributions in Western Pacific tropical cyclones

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Long‐term disdrometer observations are utilized to derive Z–R relationships for ‐the Western Pacific tropical cyclones. A hybrid moment‐based approach is employed to determine the interrelationships among pairs of gamma distribution parameters. Enhanced estimates of rainfall rate and slope parameter are obtained using machine‐learning techniques ...
Jayalakshmi Janapati, Balaji Kumar Seela, Spandana Vadloori, Pay‐Liam Lin, Chuan‐Chi Tu, Everette Joseph   +5 more
wiley   +1 more source

A General Group Testing Strategy for Discovering Chemical Cooperativity. [PDF]

Angew Chem Int Ed Engl
A combinatorial design theory‐based group testing strategy coupled with luminescence screening to uncover cooperative interactions in a large combinatorial space. Iterative deconvolution identifies reactive molecular pairs and enables the discovery of trifluoromethylthiolation (SCF3) reagents.
Pflüger PM, Katzenburg F, Sandfort F, Teders M, Gómez-Suárez A, Standley EA, Hopkinson MN, Daniliuc CG, Heuer A, Glorius F.   +9 more
europepmc   +3 more sources

Extensions of Steiner Triple Systems

Journal of Combinatorial Designs
ABSTRACTIn this article, we study extensions of Steiner triple systems by means of the associated Steiner loops. We recognize that the set of Veblen points of a Steiner triple system corresponds to the center of the Steiner loop. We investigate extensions of Steiner loops, focusing in particular on the case of Schreier extensions, which provide a ...
Giovanni Falcone, Agota Figula, Mario Galici   +2 more
openaire   +2 more sources

The Nexus Between Circular Economy and Sustainable Supply Chain Management: PRISMA Methodology

Sustainable Development, EarlyView.
ABSTRACT The intersection of sustainable supply chain management (SSCM) and circular economy (CE) has attracted increasing academic and practical attention, emphasizing the need for integrated sustainability approaches. This study employs the PRISMA protocol and conceptualizes the CE–SSCM relationship as a dynamic system in which internal capabilities,
Feriel Barkaoui, Khaled Ben abdallah
wiley   +1 more source

Perspectives on Climate Change in Education for Sustainability: Linking Concepts and Skills for a Practical Ecological Transition

Sustainable Development, EarlyView.
ABSTRACT ‘Hard’ natural sciences have extensively been used to provide evidence that climate change is happening and climate action is needed. If the contribution of our economic activities to disturbing our climate systems is now largely accepted, the way in which we design and operationalise ‘climate action’—how we transition to more sustainable ...
Sandrine Simon
wiley   +1 more source