This is the 13551st most frequent Russian word.
научных
"Научных" means "scientific."
Here, 'научных' is an adjective modifying 'конференций,' meaning scientific conferences related to academic or scientific fields.
В университете проводится много научных конференций.
The university hosts many scientific conferences.
In this sentence, 'научных' modifies 'авторов,' suggesting authors who are engaged in science or academic research.
Этот журнал публикует только научных авторов.
This journal publishes only scientific authors.
'Научных' here describes 'работ,' indicating works or papers in science or academia.