Results 31 to 40 of about 8,195,688 (291)
Structure and Complexity of Bag Consistency [PDF]
ACM SIGMOD Record, 2021 Since the early days of relational databases, it was realized that acyclic hypergraphs give rise to database schemas with desirable structural and algorithmic properties. In a bynow classical paper, Beeri, Fagin, Maier, and Yannakakis established several different equivalent characterizations of acyclicity; in particular, they showed that the sets of ...
Atserias, Albert, Kolaitis, Phokion
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Octonion Internal Space Algebra for the Standard Model
Universe, 2023 This paper surveys recent progress in our search for an appropriate internal space algebra for the standard model (SM) of particle physics. After a brief review of the existing approaches, we start with the Clifford algebras involving operators of left ...
Ivan Todorov
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Italian Journal of Food Safety, 2016 A C18 column packed with core-shell particles was used for the chromatographic separation of sulphonamides in feed and meat by a conventional high performance liquid chromatography system coupled with a diode array detector.
Antonio Armentano +5 more
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Crystal Structure of a Eukaryotic GEN1 Resolving Enzyme Bound to DNA
Cell Reports, 2015 We present the crystal structure of the junction-resolving enzyme GEN1 bound to DNA at 2.5 Å resolution. The structure of the GEN1 protein reveals it to have an elaborated FEN-XPG family fold that is modified for its role in four-way junction resolution.
Yijin Liu +5 more
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On the structure of complex Clifford algebra [PDF]
, 2010 The structure of a complex Clifford algebra is studied by direct sum decompositions into eigenspaces of specific linear ...
Brackx, Fred +2 more
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Structural Mechanics of Engineering Constructions and Buildings, 2023 Known methods and approaches are ineffective or not applicable at all in the study of mechanical characteristics and adhesion of coatings of complex structure, initially formed on non-planar surfaces.
Samat N. Yakupov +2 more
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Hierarchical community structure in complex (social) networks [PDF]
, 2014 The investigation of community structure in networks is a task of great importance in many disciplines, namely physics, sociology, biology and computer science where systems are often represented as graphs.
Bagnoli, Franco, Massaro, Emanuele
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On the structural complexity of a protein [PDF]
Protein Engineering, Design and Selection, 2003 The determination of the configuration of a protein in three-dimensional (3D) space constitutes one of the major challenges in molecular biology research today. A method consists in choosing a protein structure from a database that minimizes an energy function.
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The Complexity of Countable Structures [PDF]
The Bulletin of Symbolic Logic, 2018 Author(s): Harrison-Trainor, Matthew Alexander | Advisor(s): Montalban, Antonio | Abstract: We prove various results about the complexity of countable structures, both computable and arbitrary.We begin by investigating descriptions of countable structures in the infinitary logic Lω1ω.
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Research progress of 3D printing PDC and PDC bit
Jin'gangshi yu moliao moju gongcheng, 2023 PDC bit has become the preferred type of drill bits in the field of oil and gas exploration. The ever-increasing performance requirements of PDC bits, especially the drilling efficiency, have brought great challenges to the drill bits. The improvement of
Jingjing WU +5 more
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