By J. P. Den Hartog
This terrific textual content deals complex undergraduates and graduate scholars a piece of intermediate hassle that includes a variety of issues of whole solutions. It explores torsion, rotating disks, membrane stresses in shells, bending of flat plates, beams on elastic origin, 2-dimensional idea of elasticity, the strength tools, and buckling. 1952 variation.
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Additional info for Advanced Strength of Materials (Dover Books on Engineering)
Silicon carbide (SiC) Silicon carbide (SiC) is a wide-band-gap compound semiconductor which is a promising candidate for high power, high frequency and high temperature applications. 46 It is known that SiC crystals take a variety of surface reconstructions depending on the annealing temperatures. 47 reported that heating the as-introduced sample at 1050◦C in ultra-high vacuum (UHV) led to the formation of a 3 × 3 structure. √ √ Such a 3 × 3 surface reconstruction was also observed by annealing a SiC- 3 × 3 silicate surface at 1050◦C for 15 min in UHV.
0 ˚ A, which is very close to the 6×6 periodicity (∼ 19 ˚ A) of pristine SiC(0 0 0 1). 1 ˚ A as determined from the line proﬁles of the STM images. 0 V), which again clearly displays the honeycomb structures. A comparison of STM images recorded for the same region with reverse bias polarity is made in Figs. 9(f) and (g). 55 After annealing at 1050◦C for 5 min (see Fig. 10(a)), the STM image clearly shows the coexistence of two structures: the upper region corresponds to the √ √ disordered 6 3 × 6 3 R30◦ reconstruction and the lower region corresponds to √ √ the carbon nanomesh structures.
1. Conventional STM tip The formation of a useful tip is the key to a productive tunneling microscope. The operating characteristics of the entire microscope are dependent upon the single atom at the very end of the probe tip. In general, a relatively hard material is used in tip fabrication because contact between tip and sample surface can occur during scanning. Tungsten (W) tips are widely used in STM studies, particularly under UHV (ultrahigh vacuum) conditions. However, the electrochemical etching of W tips involves the formation of an unwanted oxide layer, hence other noble metals including platinum and gold are also viable candidate materials for tip-making due to their inert properties.