Results 71 to 80 of about 1,563,307 (153)

Partial normalizations of coxeter arrangements and discriminants [PDF]

, 2011
We study natural partial normalization spaces of Coxeter arrangements and discriminants and relate their geometry to representation theory. The underlying ring structures arise from Dubrovin’s Frobenius manifold structure which is lifted (without unit)
Granger, Michel, Mond, D. (David), Schulze, Mathias   +2 more
core   +3 more sources

Non-circular Gas Kinematics and Star Formation in the Ringed Galaxy NGC 4736

, 2000
We analyze the gas kinematics and star formation properties of the nearby RSab galaxy NGC 4736 using interferometric and single-dish CO(1-0) data and previously published Halpha and HI data.
Aalto S., Athanassoula E., Begeman K. G., Block D. L., Block D. L., Bloemen J. B. G. M., Bosma A., Braun R., Buta R., Combes F., Dahmen G., Elmegreen B. G., Friedli D., Friedli D., Gerin M., Heckman T. M., Huchtmeier W. K., Kimura T., Kotilainen J. K., Laine S., Leo Blitz, Louis P. D., Mollenhoff C., Mulder P. S., Mulder P. S., Roche P. F., Shioya Y., Steer D. G., Strong A. W., Tony Wong, van der Kruit P. C., van der Kruit P. C.   +31 more
core   +1 more source

Crystal structure and optical spectroscopic analyses of (E)-3-(1H-indol-2-yl)-1-(4-nitrophenyl)prop-2-en-1-one hemihydrate

Acta Crystallographica Section E: Crystallographic Communications, 2018
The asymmetric unit of the title compound, 2C17H12N2O3·H2O comprises two molecules of (E)-3-(1H-indol-2-yl)-1-(4-nitrophenyl)prop-2-en-1-one and a water molecule. The main molecule adopts an s-cis configuration with respect to the C=O and C=C bonds.
Muhamad Fikri Zaini, Ibrahim Abdul Razak, Wan Mohd Khairul, Suhana Arshad   +3 more
doaj   +1 more source

Crystal structure, Hirshfeld surface analysis and interaction energy and DFT studies of 2-(2,3-dihydro-1H-perimidin-2-yl)-6-methoxyphenol

Acta Crystallographica Section E: Crystallographic Communications, 2020
The title compound, C18H16N2O2, consists of perimidine and methoxyphenol units, where the tricyclic perimidine unit contains a naphthalene ring system and a non-planar C4N2 ring adopting an envelope conformation with the NCN group hinged by 47.44 (7 ...
Ballo Daouda, Nanou Tiéba Tuo, Tuncer Hökelek, Kangah Niameke Jean-Baptiste, Kodjo Charles Guillaume, Kablan Ahmont Landry Claude, El Mokhtar Essassi   +6 more
doaj   +1 more source

Stochastic bursting in unidirectionally delay-coupled noisy excitable systems

, 2019
We show that \emph{stochastic bursting} is observed in a ring of unidirectional delay-coupled noisy excitable systems, thanks to the combinational action of time-delayed coupling and noise.
Pikovsky, Arkady, Zheng, Chunming
core   +1 more source

Synthesis and Magnetic Properties of Stable Radical Derivatives Carrying a Phenylacetylene Unit

Molecules, 2018
A nitronyl nitroxide derivative, 2-phenylethynyl-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-1-oxyl-3-oxide (1), and two verdazyl derivatives carrying a phenylacetylene unit, 1,5-diphenyl-3-phenylethynyl-6-oxo-1,2,4,5-tetrazin-2-yl (2) and 1,5 ...
Shogo Miyashiro, Tomoaki Ishii, Youhei Miura, Naoki Yoshioka   +3 more
doaj   +1 more source

The Normalizer of a Group in the Unit Group of Its Group Ring

, 1999
Let G be a group and R a commutative ring. One of the main objects Ž . investigated in the theory of group rings is the unit group U s U R, G of the group ring RG.
M. Mazur
semanticscholar   +1 more source

Crystal structure, Hirshfeld surface analysis and DFT studies of 1,3-bis[2-methoxy-4-(prop-2-en-1-yl)phenoxy]propane

Acta Crystallographica Section E: Crystallographic Communications, 2020
The asymmetric unit of the title compound, C23H28O4, comprises two half-molecules, with the other half of each molecule being completed by the application of twofold rotation symmetry.
Abdelmaoujoud Taia, Mohamed Essaber, Tuncer Hökelek, Abdeljalil Aatif, Joel T. Mague, Ali Alsalme, Nabil Al-Zaqri   +6 more
doaj   +1 more source

Miniaturized Substrate Integrated Waveguide Diplexer Using Open Complementary Split Ring Resonators [PDF]

Radioengineering, 2017
In this paper, two miniaturized planar diplexers based on the substrate integrated waveguide (SIW) structure loaded by open complementary split-ring resonators (OCSRRs) are proposed.
M. Danaeian, K. Afrooz, A. Hakimi
doaj  

Crystal structure, Hirshfeld surface analysis and DFT study of (2Z)-2-(4-fluorobenzylidene)-4-(prop-2-yn-1-yl)-3,4-dihydro-2H-1,4-benzothiazin-3-one

Acta Crystallographica Section E: Crystallographic Communications, 2019
The title compound, C18H12FNOS, is built up from a 4-fluorobenzylidene moiety and a dihydrobenzothiazine unit with a propynyl substituent, with the heterocyclic portion of the dihydrobenzothiazine unit adopting a shallow boat conformation with the ...
Brahim Hni, Nada Kheira Sebbar, Tuncer Hökelek, Younes Ouzidan, Ahmed Moussaif, Joel T. Mague, El Mokhtar Essassi   +6 more
doaj   +1 more source