Št. zadetkov: 12
Doktorska disertacija
Oznake:
contact of two nominally flat surfaces;real contact area;asperity deformations;experimental in-situ analysis;material properties Surface topography;dissertations;
V splošnem strojništvu se pogoje v kontaktu računa z upoštevanjem nominalne kontaktne površine med dvema površinama, ki je bistveno večja od dejanske kontaktne površine. Upoštevanje takšne predpostavke vodi v izračun milejših kontaktnih pogojev kot so ti v resnici. V doktorski nalogi smo raziskovali ...
Leto:
2017
Vir:
Fakulteta za strojništvo (UL FS)
Izvirni znanstveni članek
Oznake:
realna kontaktna površina;drsni kontakt;realistične inženirske površine;in-situ meritev v realnem času;real contact area;sliding contact;realistic engineering surfaces;real-time in-situ measurement;
Real contact area is a challenging phenomenon in tribology, where despite established theoretical models, detailed experimental studies are still lacking. This work is focused on the evolution of the real contact area of multi-asperity steel contacts during sliding, by using sub-micron characterisat ...
Leto:
2024
Vir:
Fakulteta za strojništvo (UL FS)
Izvirni znanstveni članek
Oznake:
in-situ asperity experiment;multi-asperity contacts;real contact area;work-hardening;deformation;steel;roughness;
How the contact behaviours of steel engineering surfaces with different roughnesses (R$_a$ = 0.1, 0.6 and 1.0 µm) are affected by the asperity work-hardening and the deformation regime are described here. Large values of the plasticity index Ψ between 20 and 50 indicate that all the surfaces should ...
Leto:
2023
Vir:
Fakulteta za strojništvo (UL FS)
Diplomsko delo
Oznake:
sladoled;kazeini;sirotkini proteini;poliakrilamidna gelska elektroforeza;bližnja infrardeča spektroskopija;NIR;diplomska dela;
Sladoled velja za eno najbolj priljubljenih živil po celem svetu. Gre za
kompleksno živilo, kjer vsaka komponenta igra pomembno vlogo pri zagotavljanju in
oblikovanju kakovostnega produkta. Eno izmed pomembnejših komponent sladoledne
mase predstavljajo proteini. Glavni vir proteinov v sladoledn ...
Leto:
2024
Vir:
Fakulteta za kemijo in kemijsko tehnologijo (UL FKKT)
Izvirni znanstveni članek
Oznake:
beta-laktami;fotokataliza;sulfonamidi;sulfamoil kloridi;beta-lactams;photocatalysis;sulfonamides;sulfamoyl chlorides;
Sulfonyl chlorides are a synthetically attractive source of sulfonyl radicals in photoredox catalysis and are useful precursors in the synthesis of sulfones. Sulfamoyl chlorides, on the other hand, remain poorly represented despite their similar potential. In this study, N-chlorosulfonylated β-lacta ...
Leto:
2024
Vir:
Fakulteta za kemijo in kemijsko tehnologijo (UL FKKT)
Izvirni znanstveni članek
Oznake:
kinolizini;pirido[1,2-a]pirimidini;tiazolo[3,2-a]pirimidini;fotoredoks kataliza;arilacija;spajanje;quinolizines;pyrido[1,2-a]pyrimidines;thiazolo[3,2-a]pyrimidines;photoredox catalysis;arylation;cross-coupling;
Irradiation of mixtures of title diazonium salts and heteroarenes with green light (510 nm) in the presence of eosin Y disodium salt (EY-Na$_2$) as a photocatalyst furnished the corresponding arylation products in 8−63% yields. The proposed photocatalytic cycle is analogous to that proposed previous ...
Leto:
2023
Vir:
Fakulteta za kemijo in kemijsko tehnologijo (UL FKKT)
Izvirni znanstveni članek
Oznake:
ketopinska kislina;amidiranje;redukcija;diamini;N-heterociklični prekurzorji karbena;asimetrična kataliza;amidinijeve soli;hidroliza;ketopinic acid;amidation;reduction;diamines;N-heterocyclic carbene precursors;asymmetric catalysis;amidinium salts;hydrolysis;
The endo- and exo-N-heterocyclic carbene precursors based on camphor were prepared
diastereoselectively in five synthetic steps starting from (1S)-(+)-ketopinic acid. The obtained Nheterocyclic carbene precursors were investigated in an asymmetric benzoin reaction. All newcompounds were fully chara ...
Leto:
2023
Vir:
Fakulteta za kemijo in kemijsko tehnologijo (UL FKKT)
Izvirni znanstveni članek
Oznake:
rutenijeva kataliza;heterocikli;C-H aktivacija;piridoni;2-bromopiridini;ruthenium catalysis;heterocycles;C-H activation;pyridones;2-bromopyridines;
A novel methodology for the synthesis of 2-pyridones bearing a 2-pyridyl group on nitrogen and carbon atoms, starting from 2-bromopyridines, was developed employing a simple Ru(II)–KOPiv–Na$_2$CO$_3$ catalytic system. Unsubstituted 2-bromopyridine was successfully converted to the penta-heteroarylat ...
Leto:
2024
Vir:
Fakulteta za kemijo in kemijsko tehnologijo (UL FKKT)
Izvirni znanstveni članek
Oznake:
organokatalizatorji;piroloni;spiroheterociklizacija;3-izotiocianato oksindoli;kaskadne reakcije;spiro spojine;organocatalysis;pyrrolones;spiroheterocyclization;3-isothiocyanato oxindoles;cascade reaction;spiro compounds;
Arylidene-∆$^2$-pyrrolin-4-ones undergo organocatalyzed double spirocyclization with 3-isothiocianato oxindoles in a domino 1,4/1,2-addition sequence. The products contain three contiguous stereocenters (ee up to 98%, dr up to 99:1, 12 examples). The absolute configuration of the major diastereomer ...
Leto:
2020
Vir:
Fakulteta za kemijo in kemijsko tehnologijo (UL FKKT)
Izvirni znanstveni članek
Oznake:
organokataliza;asimetrična sinteza;enantioselektivnost;učinki topil;piroloni;psevdo-enantiomerne konformacije katalizatorja;organocatalysis;asymmetric synthesis;enantioselectivity;solvent effects;pyrrolone;pseudo-enantiomeric catalyst conformations;
Arylidene-Δ2-pyrrolin-4-ones undergo organocatalyzed annulation with malononitrile, furnishing dihydropyrano[3,2-b]pyrroles (18 examples, 0–77% ee in dichloromethane, 11–44% ee in methanol). The products could be enantiomerically enriched by trituration (11 examples, 95–99% ee). Enantioselectivity w ...
Leto:
2022
Vir:
Fakulteta za kemijo in kemijsko tehnologijo (UL FKKT)