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The contact between the soil and the horizontal confinement walls is assumed to be perfectly rough.
Ampadu, SIK; Ackah, P; Nimo, FO; Boadu, F, A laboratory study of horizontal confinement effect on the dynamic cone penetration index of a lateritic soil, Transportation Geotechnics, vol 10 (2017), pp. 47-61 [10.1016/j.trgeo.2016.12.002] [abs].
It is also possible to avoid the horizontal confinement in cases when it is not wanted.
At certain frequencies we also observe an additional horizontal confinement due to coupling of the acoustic wave from the vertical into the horizontal directions, especially within our setup employing a capillary.
We observed that by slightly modulating the ultrasound frequency (typical settings: 20 kHz frequency deviation, modulation frequency 1 kHz), we are able to significantly suppress unwanted horizontal confinement due to an averaging effect over several different standing wave patterns.
Since our probe chamber is not optimized for this, this additional horizontal confinement is less pronounced and is very sensitive on the experimental settings, e.g. on the excitation frequency.
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We studied the upper-bound ultimate bearing capacity of smooth strip shallow footings with symmetrical and asymmetrical horizontal confinements on purely frictional sand within the framework of upper-bound limit analysis.
Increasing the amount of horizontal reinforcement and providing confinement in the boundary regions controlled the opening of crack width and made structure more ductile.
Fig. 2 Optimization of the horizontal slot waveguide: a Confinement factor (normalized power) in the slot region as a function of the thickness of the low index layer (slot) and the HI-layers.
For conventional designs of single-layer Si3N4 or SiO2 passivation, the variation of lateral near-field confinement and the horizontal far-field (FF) divergence can be determined via the modification of dielectric layer thickness.
To improve the electron beam confinement with an additional horizontal focusing force, the geometrical shape of the ferromagnet pieces were refined by use of a newly developed 3D code.
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