87191-41-1; TeF5N(I)CF3, 98720-72-0; TeF5N(CF3)C(0)CH3, 98720-73-1; (TeF,),NCF,, 87191-42-2; TeFSN(SF5)CF3, 98720-74-2; TeF5N-(CF,)CH,CH,Br, 98720-75-3; TeF,N=C(CI)OCH,, 98720-76-4; Te-24, Mg2CoHS and its deuteride have been prepared as black crystalline solids by a sintering technique at temperatures between 620 and 770 K and hydrogen (deuterium) pressures between 40 and 60 bar. X-ray and neutron powder diffraction data recorded at room temperature suggest a tetragonally distorted CaF,-type metal atom structure (for the deuteride a = 4.463 (4) A, c = 6.593 (6) A, space group P 4 / n m m , and 2 = 2). The D atoms surround the Co atoms in an ordered square-pyramidal configuration (d[Co-D] = 1.590 (17) A (apical) and 1.515 (3) A (basal)). The structure transforms at 488 (5) K into a disordered cubic modification ( a = 6.453 (6) A, at 498 K). The heat of dissociation of the hydride as measured from pressure-composition isotherms is 86 (5) kJ/mol of H,. The electrical resistivity suggests nonmetallic behavior.
Existing image-difference measures show excellent accuracy in predicting distortions, such as lossy compression, noise, and blur. Their performance on certain other distortions could be improved; one example of this is gamut mapping. This is partly because they either do not interpret chromatic information correctly or they ignore it entirely. We present an image-difference framework that comprises image normalization, feature extraction, and feature combination. Based on this framework, we create image-difference measures by selecting specific implementations for each of the steps. Particular emphasis is placed on using color information to improve the assessment of gamut-mapped images. Our best image-difference measure shows significantly higher prediction accuracy on a gamut-mapping dataset than all other evaluated measures.
Neutron-diffraction experiments on ceramic powders of YBa2Cu306+x (nonsuperconducting, with x ~0.0 and 0.15) have confirmed the existence of long-range, three-dimensional, antiferromagnetic order of the Cu spins. The structure determination was aided by the use of uniaxially oriented powders. The ordering wave vector within a Cu02 plane is (j j ) and the planes are coupled antiferromagnetically along the c axis. The Neel temperature is 400 ± 10 K for the x =0.15 ± 0.05 sample and S;500 K for jc=0.0.
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