Results 41 to 50 of about 2,732,155 (328)
Size Bounds and Query Plans for Relational Joins [PDF]
2008 49th Annual IEEE Symposium on Foundations of Computer Science, 2008 Relational joins are at the core of relational algebra, which in turn is the core of the standard database query language SQL. As their evaluation is expensive and very often dominated by the output size, it is an important task for database query ...
Albert Atserias, Martin Grohe, D. Marx
semanticscholar +1 more source
Vector fields on nonorientable surfaces
International Journal of Mathematics and Mathematical Sciences, 2003 A one-to-one correspondence is established between the germs of functions and tangent vectors on a NOS X and the bi-germs of functions, respectively, elementary fields of tangent vectors (EFTV) on the orientable double cover of X.
Ilie Barza, Dorin Ghisa
doaj +1 more source
Hydrogel‐Based Capacitive Sensor Model for Ammonium Monitoring in Aquaculture
Advanced Engineering Materials, EarlyView.Traditional techniques for monitoring aquaculture water quality, particularly ammonium levels, harm fish. This work presents a novel capacitive sensor with an ionic hydrogel transducer to monitor ammonium concentration in real time based on the ammonium‐induced hydrogel dissociation and osmotic pressure. Monitoring aquaculture water quality, especially
Mohammad Mirzaee +3 more
wiley +1 more source
An exceptional cluster algebra for Higgs plus jet production
Journal of High Energy PhysicsA recent evaluation of three-loop nonplanar Feynman integrals contributing to Higgs plus jet production has established their dependence on two novel symbol letters. We show that the resulting alphabet is described by a G 2 cluster algebra, enlarging the
Rigers Aliaj, Georgios Papathanasiou
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On four-point connectivities in the critical 2d Potts model
SciPost Physics, 2019 We perform Monte-Carlo computations of four-point cluster connectivities in the critical 2d Potts model, for numbers of states $Q\in (0,4)$ that are not necessarily integer.
Marco Picco, Sylvain Ribault, Raoul Santachiara
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GIS spatial analysis of the distribution of snow depth: A study of western Rhodopes, Bulgaria [PDF]
Glasnik Srpskog Geografskog Društva, 2016 The aim of the present research is to show the advantages of information technology in investigating the snow cover. The snow data is usually taken from the measurement in meteorological stations which are often sparsely and insufficient.
Nikolova Valentina, Penkov Aleksandar
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Orbital Topology of Chiral Crystals for Orbitronics
Advanced Materials, EarlyView.Chirality is ubiquitous in nature and constitutional for life. In chiral materials the intrinsic handedness, defined by their crystal structure, becomes a main driver for a novel electronic topology that is based on the orbital angular momentum rather than the electron spin.
Kenta Hagiwara +16 more
wiley +1 more source
Cover semantics for quantified lax logic
Journal of Logic and Computation, 2011 Lax modalities occur in intuitionistic logics concerned with hardware verification, the computational lambda calculus and access control in secure systems. They also encapsulate the logic of Lawvere–Tierney–Grothendieck topologies on topoi.
R. Goldblatt
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Applied Sciences, 2022 In this paper, an image analysis framework is formulated for Landsat-8 Operational Land Imager and Thermal Infrared Sensor (OLI/TIRS) scenes using the R programming language.
Polina Lemenkova, Olivier Debeir
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Topology in Biological Piezoelectric Materials
Advanced Materials, EarlyView.This review summarizes the topological structures in biological piezoelectric materials, covering morphology evolution, spatial arrangement, and biomimetic strategies. These topologies modulate structure‐property relationships across multiple scales, enabling performance enhancement and multifunctional integration.
Chen Chen +7 more
wiley +1 more source