Zobrazeno 1 - 10
of 46
pro vyhledávání: '"Jan Hlavac"'
Autor:
Jan Hlavac, Jiri Dekastello
Publikováno v:
Machines, Vol 12, Iss 7, p 477 (2024)
This paper focuses on determining the friction energy loss in the mechanism of a mechanical crank press. After defining the crank press mechanism and how it works, we describe the energy balance of a technological operation—forming. Four distinct m
Externí odkaz:
https://doaj.org/article/fe5eac218cd24eb99d29cea6e717478c
Publikováno v:
ACS Omega, Vol 5, Iss 16, Pp 9324-9333 (2020)
Externí odkaz:
https://doaj.org/article/9159e41a13ae43689792f511a58c1ffe
Publikováno v:
Advances in Mechanical Engineering, Vol 14 (2022)
The paper deals with the drive options of mechanical presses and their influence on energy efficiency. Although the main focus is on energy efficiency, we also emphasize design and operational issues. The press machine is divided into two separate se
Externí odkaz:
https://doaj.org/article/342208465ce043458d8f5b67d13307c3
The thermal balance of forging press and influence of its thermal state to machine and its operation
Publikováno v:
Advances in Mechanical Engineering, Vol 12 (2020)
The paper deals with the influence of the thermal state of the machine on its function and product accuracy. The results of the experimental measurement on a particular machine are presented and consequently a virtual simulation of the thermal state
Externí odkaz:
https://doaj.org/article/8c6d178cd0a949f2b4043c9ac33d4495
Autor:
Leona Vychodilova, Michaela Necesankova, Katerina Albrechtova, Jan Hlavac, David Modry, Eva Janova, Mirko Vyskocil, Andrei D Mihalca, Lorna J Kennedy, Petr Horin
Publikováno v:
PLoS ONE, Vol 13, Iss 6, p e0199506 (2018)
The village and street dogs represent a unique model of canine populations. In the absence of selective breeding and veterinary care, they are subject mostly to natural selection. Their analyses contribute to understanding general mechanisms governin
Externí odkaz:
https://doaj.org/article/1b93e0bf99bb40859b0f4fc885971f10
Autor:
Petr Funk, Kamil Motyka, Miroslav Soural, Michal Malon, Hiroyuki Koshino, Joachim Kusz, Jan Hlavac
Publikováno v:
PLoS ONE, Vol 12, Iss 5, p e0175364 (2017)
2-Aminoquinolin-4(1H)-one was reacted with various primary/secondary amines and paraformaldehyde under Mannich reaction conditions. In the case of secondary amines, the reaction in N,N-dimethylformamide yielded expected Mannich products accompanied w
Externí odkaz:
https://doaj.org/article/e81ea93c0823426aae69db78cfd045ae
Autor:
Sona Krupkova, Gonzalo Pazos Aguete, Leona Kocmanova, Tereza Volna, Martin Grepl, Lucie Novakova, Marvin John Miller, Jan Hlavac
Publikováno v:
PLoS ONE, Vol 11, Iss 11, p e0166558 (2016)
Derivatives of 3-methyl-3,6-dihydro-2H-1,2-oxazine-6-carboxylic acid prepared by regioselective hetero Diels-Alder reaction of arylnitroso compounds with sorbic acid were used for solid-phase synthesis of a library of derivatives that included modifi
Externí odkaz:
https://doaj.org/article/d96599cc282e4c2b96b47d0daebfc6bc
Autor:
Lucie Brulikova, Jan Hlavac
Publikováno v:
Beilstein Journal of Organic Chemistry, Vol 7, Iss 1, Pp 678-698 (2011)
This review article summarizes the results of a long-term investigation of 5-alkoxymethyluracil analogues and is aimed, in particular, at methods of syntheses. Most of the presented compounds were synthesized in order to evaluate their biological act
Externí odkaz:
https://doaj.org/article/4f919cb351cd4b0a85b0467b831825a9
Publikováno v:
ARKIVOC, Vol 2010, Iss 10, Pp 255-265 (2010)
Externí odkaz:
https://doaj.org/article/7e90918931c74b81b99387f13e313ec1
Publikováno v:
PLoS ONE, Vol 10, Iss 12, p e0144613 (2015)
Copper-free click reactions between a dibenzoazocine derivative and azides derived from 5-methyluridine were investigated. The non-catalyzed reaction yielded both regioisomers in an approximately equivalent ratio. The NMR spectra of each regioisomer
Externí odkaz:
https://doaj.org/article/a93f36e84daf427184ff936cff00fbc5