155 research outputs found
1-(4-Methoxyphenyl)-4-(3-nitrophenyl)-3-phenoxyazetidin-2-one
In the title compound, C22H18N2O5, the four-membered β-lactam ring is nearly planar, with a maximum deviation of 0.023 (2) Å for the N atom, and has long C—C distances of 1.525 (5) and 1.571 (5) Å. The mean plane of this group makes dihedral angles of 11.61 (19), 74.5 (2) and 72.3 (2)° with three aromatic rings. An intramolecular C—H⋯O hydrogen bond occurs. The packing of the molecules in the crystal structure is governed mainly by intermolecular C—H⋯O hydrogen-bonding and C—H⋯π stacking interactions. Furthermore, a π–π interaction [centroid–centroid distance = 3.6129 (19) Å] helps to stabilize the crystal structure
Analog CMOS implementation of cellular neural networks
Ankara : Department of Electrical and Electronics Engineering and Institute of Engineering and Sciences, Bilkent Univ., 1991.Thesis (Master's) -- Bilkent University, 1991.Includes bibliographical references leaves 38-39An analog CMOS circuit realization of cellular neural networks with transconductance
elements is presented in this thesis. This realization can be easily
adapted to various types of applications in image processing by just choosing
the appropriate transconductance parameters according to the predetermined
coefficients. The noise-reduction and edge detection examples have shown
the effectiveness of the designed networks in real time image processing applications.
For “fix function” cellular neural network circuits the number of
transistors are reduced further by a new multi-input voltage-controlled current
source.Baktır, İzzet AdilM.S
(E)-1-(4,4′′-Difluoro-5′-methoxy-1,1′:3′,1′′-terphenyl-4′-yl)-3-(4-methylphenyl)prop-2-en-1-one
In the meta-terphenyl fragment of the title molecule, C29H22F2O2, the two fluorophenyl rings are twisted from the central benzene ring by 46.72 (6) and 41.70 (6)°, respectively. In the crystal, weak C—H⋯O and C—H⋯F hydrogen bonds link the molecules into layers parallel to the ab plane. The crystal packing exhibits π–π interactions, the shortest distance between the centroids of aromatic rings being 3.6364 (7) Å
3,5-Bis(4-methoxyphenyl)-1-phenyl-4,5-dihydro-1H-pyrazole
In the title compound, C23H22N2O2, the central pyrazole ring is nearly planar (r.m.s. deviation = 0.046 Å) and it makes a dihedral angle of 18.5 (2)° with the phenyl ring. The dihedral angles between the phenyl and the two methoxy-substituted phenyl rings are 26.2 (2) and 80.6 (2)°. The crystal structure is stabilized by C—H⋯π stacking interactions and weak π–π interactions [centriod–centroid distance = 3.891 (2) Å]
(±)-trans-6,7-Dimethoxy-1-oxo-3-(2-thienyl)isochroman-4-carboxylic acid
The title compound, C16H14O6S, was synthesized by the reaction of 6,7-dimethoxyhomophthalic anhydride with thiophene-2-carbaldehyde in the presence of 4-(dimethylamino)pyridine (DMAP) as a basic catalyst. The thiophene ring of the title molecule is disordered over two sites with occupancies of 0.877 (3) and 0.123 (3). The disorder corresponds to an approximate 180° rotation of the thiophene ring with respect to the C—C bond linking it to the rest of the molecule. The six-membered ring of the 3,4-dihydroisochromanone ring system is not planar [puckering parameters Q
T = 0.571 (2) Å, θ = 115.2 (2)° and ϕ = 99.1 (2)°]. The benzene ring of the 3,4-dihydroisochromanone ring system makes dihedral angles of 75.0 (2) and 77.2 (5)° with the disordered thiophene rings. Intermolecular O—H⋯O and C—H⋯O hydrogen bonds, as well as C—H⋯π interactions, lead to the observed supramolecular structure
3,5-Bis(4-fluorophenyl)-4,5-dihydro-1H-pyrazole-1-carbaldehyde
In the title molecule, C16H12F2N2O, the pyrazole ring adopts a slight envelope conformation with the methylene C atom deviating by 0.114 (3) Å from the mean plane of the other four atoms [maximum deviation = 0.021 (3) Å]. The dihedral angles between the four essentially planar atoms of the pyrazole ring and the fluoro-substituted benzene rings are 2.6 (2) and 82.2 (2)°. The dihedral angle between the two benzene rings is 83.7 (2)°. The crystal packing is stabilized by weak intermolecular C—H⋯O hydrogen bonds
(E)-1-(4,4′′-Difluoro-5′-methoxy-1,1′:3′,1′′-terphenyl-4′-yl)-3-(4-nitrophenyl)prop-2-en-1-one
In the title compound, C28H19F2NO4, a polysubstituted terphenyl derivative bearing a Michael system, the C=C double bond has an E configuration. Two C—H⋯F contacts connect molecules into inversion dimers. In addition, a C–H⋯π as well as a C–F⋯π contact can be identified. The shortest centroid–centroid distance between two aromatic rings is 3.9535 (8) Å, between one of the para-fluorobenzene rings and its symmetry-generated equivalent
(E)-1-(4,4′′-Difluoro-5′-methoxy-1,1′:3′,1′′-terphenyl-4′-yl)-3-phenylprop-2-en-1-one
The title compound, C28H20F2O2, is a polysubstituted terphenyl derivative bearing a Michael system. The C=C double bond is E configured. In the crystal, C—H⋯O and C—H⋯F contacts connect the molecules, forming undulating sheets that lie perpendicular to the crystallographic a axis. The shortest π–π interaction [centroid–centroid distance = 3.7163 (7) Å] involves the para-fluorophenyl ring in the para position to the Michael system, and its symmetry-generated equivalent
The Dutiful Daughters of the British Empire: Psychosocial Topology of The British Hospital in Smyrna
Scholarship on the accounts of the Western travellers about the Ottoman Empire focuses on some commonly known writers only, and Ismeer, or Smyrna, and its British hospital in 1855, by a lady (M. Nicol) remains neglected. It is a diary written by a lady-nurse, Martha Nicol, who worked in the British hospital in Smyrna, during the Crimean War. She is tightly bound in with the imperial ideology and by reconceptualising the space in the hospital, the lady-nurses help the British soldiers achieve a sense of continuity between their home back in England and the host culture about which they know very little. By playing a formative role to transpose this hospital to a homely space in a foreign territory, the lady-nurses function as psychic and cultural stabilisers. This essay aims to decipher how the hospital space functions as an ideological heterotopia of deviance, and how the lady-nurses contribute to its power to inspire the idea of "at-homeness" in the soldiers and retain the ideological structuring mechanisms in this distant location by exploring the textual evidence in the book. This essay will also explore how power and ideology are contextualised in the psychosocial topology of the hospital
4-(9-Anthryl)-1-(2,4-dimethoxyphenyl)spiro[azetidine-3,9′-xanthen]-2-one
The title compound, C37H27NO4, crystallizes with two molecules in the asymmetric unit. The β-lactam ring of each molecule is very nearly planar, with maximum deviations of 0.001 (2) and 0.017 (2) Å in the two molecules. The crystal structure is stabilized by intermolecular C—H⋯O and C—H⋯N contacts, as well as by weak C—H⋯π interactions
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