Results 51 to 60 of about 72,690 (163)
Sensors, 2019 This study proposes a high-sensitivity microwave sensor based on an interdigital-capacitor-shaped defected ground structure (IDCS-DGS) in a microstrip transmission line for the dielectric characterization of planar materials.
Junho Yeo, Jong-Ig Lee
doaj +1 more source
The operator rings of topological symmetric orbifolds and their large N limit
Journal of High Energy PhysicsWe compute the structure constants of topological symmetric orbifold theories up to third order in the large N expansion. The leading order structure constants are dominated by topological metric contractions.
Sujay K. Ashok, Jan Troost
doaj +1 more source
Structural insight into polyphenol oxidation during black tea fermentation
Food Chemistry: X, 2023 Polyphenol oxidation during fermentation plays a critical role in the formation of flavor and function of black tea. However, how the specific structures of tea polyphenols affect their oxidation kinetics during black tea fermentation is still unknown ...
Lin Chen +4 more
doaj +1 more source
Rate Constant for the Ring Opening of the 2,2-Difluorocyclopropylcarbinyl Radical [PDF]
Organic Letters, 2000 The rate constant for the unimolecular ring opening of the 2,2-difluorocyclopropylcarbinyl radical was determined via its competitive bimolecular trapping by TEMPO. The value of this rate constant (3.4 x 10(11) s(-)(1) at 99.3 degrees C) is about 500 times larger than that of the parent, unfluorinated radical and about 5 times smaller than that of the ...
, Tian, , Dolbier
openaire +3 more sources
Effect of antioxidant activity of caffeic acid with cyclodextrins using ground mixture method
Asian Journal of Pharmaceutical Sciences, 2018 In the current study, we prepared a ground mixture (GM) of caffeic acid (CA) with α-cyclodextrin (αCD) and with β-cyclodextrin (βCD), and then comparatively assessed the physicochemical properties and antioxidant capacities of these GMs. Phase solubility
Ryota Shiozawa +3 more
doaj +1 more source
Locally nilpotent derivations with a PID ring of constants [PDF]
Proceedings of the American Mathematical Society, 2011 Let K \mathcal {K} be a commutative field of characteristic zero, A \mathcal {A} be a domain containing K \mathcal {K} and ∂ \partial be a locally nilpotent K \mathcal {K} -derivation of A ...
Barkatou, Moulay A., El Kahoui, M'Hammed
openaire +3 more sources
Macrocyclic bis(ureas) as ligands for anion complexation
Beilstein Journal of Organic Chemistry, 2014 Two macrocyclic bis(ureas) 1 and 2, both based on diphenylurea, have been synthesized. Compound 1 represents the smaller ring with two ethynylene groups as linkers and 2 the larger ring with two butadiynylene groups.
Claudia Kretschmer +2 more
doaj +1 more source
Dependence on Dimension of a Constant Related to the Grotzsch Ring [PDF]
Proceedings of the American Mathematical Society, 1976 For the constant λ n = lim a → 0 ( mod R G , n ( a )
openaire +1 more source
Photonic Crystal Fiber Modal Interferometer for Refractive Index Sensing
Communications, 2013 We present a modification of core-cladding intermodal interferometer for refractive index sensing. Its structure consists of double cladding photonic crystal fiber (PCF) as a sensing element.
Daniel Kacik, Peter Tatar
doaj +1 more source
A database of steric and electronic properties of heteroaryl substituents
Scientific DataHeteroaryl substituents are important building blocks of functionalized organic compounds in drug discovery, materials science, and catalysis. Quantitative descriptions of steric and electronic properties of heteroaryl substituents are essential in ...
Turki M. Alturaifi +3 more
doaj +1 more source