Results 41 to 50 of about 39,785 (127)
Layer Sliding‐Induced Fluorescence Changes in a Flexible Hydrogen‐Bonded Organic Framework
Chemistry – A European Journal, Volume 31, Issue 46, August 18, 2025.A fluorescence color change from blue to green of pyrene‐based HOFs was achieved by the sliding of the H‐bonded 2D network layers. Single‐crystal XRD analysis revealed that the 2D‐layer sliding forms a pyrene dimer, which results in the green color of the HOF emission including the excimer contribution.
Taito Hashimoto +5 more
wiley +1 more source
Transforming N-ary relationships to database schemas: an old and forgotten problem [PDF]
, 2002 The N-ary relationships, have been traditionally a source of confusion and still are. One important source of confusion is that the term cardinality in a relationship has several interpretations, two of them being very popular.
Camps Pare, Rafael
core +1 more source
On the Codd Semantics of SQL Nulls
, 2017 Theoretical models used in database research often have subtle differences with those occurring in practice. One particular mismatch that is usually neglected concerns the use of marked nulls to represent missing values in theoretical models of incompleteness, while in an SQL database these are all denoted by the same syntactic NULL object.
Guagliardo, Paolo, Libkin, Leonid
openaire +1 more source
Design, implementation and experiment of a YeSQL Web Crawler
, 2012 We describe a novel, "focusable", scalable, distributed web crawler based on GNU/Linux and PostgreSQL that we designed to be easily extendible and which we have released under a GNU public licence.
Deveaud, Romain +4 more
core +1 more source
Software Engineering Laboratory (SEL) database organization and user's guide [PDF]
The organization of the Software Engineering Laboratory (SEL) database is presented. Included are definitions and detailed descriptions of the database tables and views, the SEL data, and system support data.
Heller, Gerard +3 more
core +1 more source
Compiling ER Specifications into Declarative Programs
, 2007 This paper proposes an environment to support high-level database programming in a declarative programming language. In order to ensure safe database updates, all access and update operations related to the database are generated from high-level ...
Braßel, Bernd +2 more
core +1 more source
Data Mining the SDSS SkyServer Database
, 2002 An earlier paper (Szalay et. al. "Designing and Mining MultiTerabyte Astronomy Archives: The Sloan Digital Sky Survey," ACM SIGMOD 2000) described the Sloan Digital Sky Survey's (SDSS) data management needs by defining twenty database queries and twelve ...
Gray, Jim +6 more
core
A case study using sewage metagenomic data for assessment of text-to-SQL capabilities in large language models. [PDF]
Sci RepBecsei Á +6 more
europepmc +1 more source