Slab structures

Figure 32 (a) KCaAl2F9 structure projected along the pseudo-hexagonal channel axis. Ca mediiun white, K large grey spheres, (b) HTB slab structure of Rh2Cr5Fi7... 

Figure 19 Some examples of slab structures (longest crystallographic axes in upright position)...

A three-layer slab structure was chosen to simulate rutile (110) surface within the periodic model. Unit cells were 5.91 and 6.49 A along the [001] and [-100] directions, respectively. The slabs were shared out with a 20 A gap. Taking into account the experimental data, geometric parameters of two top layers was allowed to relax during the geometry optimization. Calculations were performed within the DFT model with PBE96 exchange-correlation functional [4]. The Troullier-Martins pseudopotentials were chosen to describe Ti and Ag atoms, and the Hamann pseudopotential was used for O atoms. 

It is unclear to what extent the structure below 300 km is related to Archaean processes. The resolution tests of Sol et al. (2002) show that a slab structure that is continuous to >500 km would produce an image very similar to that in Figure 12 and may suggest that the transition-zone high-velocity anomaly (Y) is connected or related to the shallower anomaly (X). There are at least four possible explanations for the deeper high-velocity anomaly, as follows. (1) Slab material extends continuously from the surface to the base of the transition zone. This palaeo-slab has survived for well over 1 Ga and therefore the anomaly cannot be thermal in origin and for some reason it has not been mechanically eroded from the base of the continental root. (2) Material has delaminated from the base of the cra-... 

Figure 7.21 (i) Layer of edgesharing MSg octahedra, (ii) perpendicular view of the slab structure... 

Y.S. Cho, and F.-B. Lin, Spectral analysis of wave response of multi-layer thin cement mortar slab structures with finite thickness, NDT E lnt., 34, 115-122 (2001). 

Zirconium monochloride and monobromide are black powders or highly reflective microcrystals. Although the monohalides appear to be stable in air for days to weeks, they should be kept and handled under inert atmospheres if high purity is required, owing to a probable slow reduction of water vapor to form the hydrides (see below) and Zr02. These monohalides possess a rhombohedral (R3m), three-slab structure in which each slab consists of four tightly bound,... 

Technical report NCEER-87-0015, State University of New York, Buffalo Erberik MA, Elnashai AS (2004) Fragility analysis of flat-slab structures. Eng Struct... 

Equal four-layer slabs are also observed for carbide halides CR2 X2 and (C2)R2 X2 with single carbon atoms and dicarbon units, respectively, residing in all of the octahedral interstices between the metal double layers. There are also three-layer slab structures of the composition CR2)X in which one halide layer is missing such that the sequence is of the RRX type. In principle, they may be obtained with the same rare earth elements as the hydride halides. 

The XRD patterns of the -propoxy derivative of HLaNb and the products of the n-propoxy derivative of HLaNb with 4-penten-l-ol and 9-decen-l-ol are shown in Figure 1 (CH2=CH(CH2)30-HLaNb) and Figure 2 (CH2=CH(CH2)80-HLaNb). The d values for the low-angle reflections correspond to the interlayer distances. The interlayer distance increases from 1.53 nm to 1.85 (4-penten-l-ol) or 2.67 run (9-decen-l-ol). The (100) reflections at 16= 28.8°, due to the crystal structure of the perovskite-like slabs, do not shift after the reactions, thus indicating the preservation of the perovskite-like slab structure. 

The XRD pattern of the product of the reaction between CH2=CH(CH2)80-HLaNb and H-PDMS, HSi(CH3)20-[Si(CH3)20] -(CH3)2Si-H n 6), is shown in Figure 2. The XRD pattern of the product of the reaction with H-PDMS shows the disappearance of the reflection of CH2=CH(CH2)sO-HLaNb, and new broad reflections are observed at d = 3.33 nm and d = 1.61 nm. These reflections are indexed as (001) and (002), respectively, to give an approximate interlayer distance of ca. 3.3 nm. The interlayer distance can not be determined precisely, however, since weak reflections (marked by arrows) overlap at ca. 9.1° (ca. 1.2 nm) and ca. 12.1° (ca. 0.92 nm), indicating that the product of the reaction with H-PDMS is composed of compounds with different interlayer distances. Preliminary analysis of the BET specific surface area of CH2=CH(CH2)sO-HLaNb and the product of the reaction between CH2=CH(CH2)80-HLaNb and H-PDMS also showed non-porous features for these products. The (100) reflection at 28.8° is observed at the same position, indicating preservation of the perovskite-like slab structure. 

Hoang N, Fujino Y, Wamitchai P (2008) Optimal tuned mass damper for seismic applications and practical design formulas. Eng Struct 30 707-715 Hueste MBD, Bai J-W (2007) Seismic retrofit of a reinforced concrete flat-slab structure part I - seismic performance evaluation. Eng Struct 29 1165-1177 Ismail M, Ikhouane F, Rodellar J (2009) The hysteresis Bouc-Wen model, A survey. Arch Comput Meth Eng 16 161-188... 

The stability diagram of the PtjjRh jIlOO) surface shows the formation enthalpies from a CE scan (crosses) over all surface slab structures cr 2x2... 

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