N-[3-(5-Oxo-10,11-dihydro-5H-dibenzo[a,d]cyclo­hepten-2-ylamino)phen­yl]furan-3-carboxamide

In the title compound, C26H20N2O3, the two aromatic rings of the tricyclic unit are oriented at a dihedral angle of 54.53 (9)°. The crystal structure displays inter­molecular N—H⋯O hydrogen bonding

Efficient Hybrid Image Warping for High Frame-Rate Stereoscopic Rendering

Modern virtual reality simulations require a constant high-frame rate from the rendering engine. They may also require very low latency and stereo images. Previous rendering engines for virtual reality applications have exploited spatial and temporal coherence by using image-warping to re-use previous frames or to render a stereo pair at lower cost than running the full render pipeline twice. However these previous approaches have shown artifacts or have not scaled well with image size. We present a new image-warping algorithm that has several novel contributions: an adaptive grid generation algorithm for proxy geometry for image warping; a low-pass hole-filling algorithm to address un-occlusion; and support for transparent surfaces by efficiently ray casting transparent fragments stored in per-pixel linked lists of an A-Buffer. We evaluate our algorithm with a variety of challenging test cases. The results show that it achieves better quality image-warping than state-of-the-art techniques and that it can support transparent surfaces effectively. Finally, we show that our algorithm can achieve image warping at rates suitable for practical use in a variety of applications on modern virtual reality equipment

1-[4-(2-Amino­anilino)phen­yl]-2,2,2-trifluoro­ethanone

In the title compound, C14H11F3N2O, the two aromatic rings are oriented at a dihedral angle of 70.84 (8)°. The crystal structure displays inter­molecular N—H⋯O and N—H⋯F inter­actions

N-{2-Methyl-5-[(5-oxo-10,11-dihydro-5H-dibenzo[a,d]cyclo­hepten-2-yl)amino]­phen­yl}benzamide

In the title compound, C29H24N2O2, the two aromatic rings of the tricyclic unit are oriented at a dihedral angle of 32.27 (8)°. In the crystal N—H⋯O hydrogen bonds link the mol­ecules into chains along the a axis. Further N—H⋯·O inter­actions link the chains

Nonlinear vertical oscillations of a particle in a sheath of a rf discharge

A new simple method to measure the spatial distribution of the electric field in the plasma sheath is proposed. The method is based on the experimental investigation of vertical oscillations of a single particle in the sheath of a low-pressure radio-frequency discharge. It is shown that the oscillations become strongly nonlinear and secondary harmonics are generated as the amplitude increases. The theory of anharmonic oscillations provides a good qualitative description of the data and gives estimates for the first two anharmonic terms in an expansion of the sheath potential around the particle equilibrium.Comment: 11 pages, 4 figure

Ethyl 1,3-dimethyl-1H-indole-2-carboxyl­ate

In the title compound, C13H15NO2, the plane of the indole ring forms a dihedral angle of 5.26 (6)° with the ester group and the ethyl side-chain C atoms. The crystal packing is stabilized by weak inter­molecular C—H⋯O and C—H⋯π inter­actions

Crystal structures of pure 3-(4-bromo-2-chlorophenyl)-1-(pyridin-4-yl) benzo [4, 5] imidazo [1, 2-d][1, 2, 4] triazin-4 (3H)-one and contaminated with 3-(4-bromophenyl)-1 …

The side product of the cyclocondensation reaction between ethyl benzimidazole-2-carboxylate and the nitrile imine of the corresponding hydrazonyl chloride, C20H11BrClN5O, crystallized in two crystal forms. Form (1) is a co-crystal of the target compound (without any chlorine substituent) and a side product containing a Cl atom in position 2 of the bromophenyl group, C20H12BrN5O·0.143C20H11BrClN5O. (2) contains the pure side product. The slightly different conformation of the ring systems leads to a different packing of (1) and (2), but both crystal structures are dominated by π–π interactions

8-Meth­oxy-3-(4-methyl­benzyl­idene)-6-(prop-1-en­yl)chroman-4-one

In the title compound, C21H20O3, the tolyl ring makes a dihedral angle of 31.11 (6)° with the benzene ring of the chromanone unit. The pyrone ring adopts a half-chair conformation. The mol­ecular structure is stabilized by a weak intra­molecular C—H⋯O inter­action and the crystal packing is stabilized by weak inter­molecular C—H⋯O inter­actions and a C—H⋯π inter­action