Ceria-titania solutions with compositions of Ce0.9Ti0.1O2 and Ce0.8Ti0.2O2 were prepared by the citric-acid (Pechini) method and characterized using x-ray diffraction (XRD) for structure, coulometric titration for redox thermodynamics, and water-gas-shift (WGS) reaction rates. Following calcination at 973 K, XRD suggests that the mixed oxides exist as single-phase, fluorite structures, although...

Ocean acoustic noise can be processed efficiently to extract Green's function information between two receivers. By using noise array-processing techniques, it has been demonstrated that a passive array can be used as a fathometer [Siderius, et al., J. Acoust. Soc. Am. 120, 1315-1323 (2006)]. Here, this approach is derived in both frequency and time domains and the output corresponds to the ref...

User performance with a tabletop display was tested using touch-based and mouse-based interaction in a traditional pointing task. Dependent variables were throughput, error rate, and movement time. In a study with 12 participants, touch had a higher throughput with average of 5.53 bps compared to 3.83 bps for the mouse. Touch also had a lower movement time on average, with block means ranging f...

Modeling of human auditory localization has largely been limited to lateralization, or left-to-right position. This paper describes an attempt to tackle the more complicated problem of position estimation with two degrees of freedom (azimuth and elevation). Differences in interaural intensity and arrival time are extracted from the acoustic signals at the left and right eardrums, and an estimat...

The fractal dimensions of FeZSM-5 zeolites were used to characterize the change in their geometry depending on different postsynthesis treatments. The fractal dimension values were estimated from the Dubinin–Astakhov isotherms of nitrogen adsorption and related to the activity of these zeolites in the benzene hydroxylation to phenol by nitrous oxide. The zeolites had two different iron contents...

In this study, the Bohler K190 steel, manufactured by powder metallurgy (PM) process, was subjected to boronizing process. This thermochemical treatment carried out in range of 1173 1323 K, for 1–10 h. The scanning electron microscopy (SEM) utilized examining morphology layers’ interfaces with a dual-phase nature and measuring thicknesses. obtained boronized layers had maximum thickness 113 ± 4...

La gruta de Huagapo ubicado en Palcamayo, Tarma, región Junín – Perú, a 3572 m.s.n.m. Fue recorrida hasta los 2800 metros profundidad, para el uso turístico se recorre 212 (ruta seca). El trabajo esta basado la capacidad carga turística calculada con metodología Cifuentes y mejorado Cálculo acogida multicriterio CATUM, hallando física CCF, factores corrección Fc, real CCR, del manejo CM efectiv...

Silicon single crystals were deformed in tensile tests along the [134] direction between 1173 K and 1373 K. The yield point phenomenon was observed specimens below 1273 K, while a continuous above 1323 values of work-hardening rate stage II same as those reported other crystals. Orientation maps specimen obtained by using electron backscattered diffraction method indicated that starts before Sc...