Peaked stress field

For emergency purposes, the provision of jacking screws as illustrated in Figure 12 can be used to lower the feeder should a peaked stress field be established on filling and there is insufficient power to start the feeder. Lowering the feeder can induce, either fully or partially, an arched stress field and allow the feeder to be started. This precaution is useful for feeders installed under stockpiles where surcharge pressures as high as 1000 kPa may be experienced. 

For each coil, the peak magnetic field along with the average hoop stress has been calculated. In the table, (D, D ) provides the coil dimension at centre (r along to the radial if) and axial (z) coordinate directions. The hoop stress for each coil is reported in the last column. All 12 coils of the as3nnmetric magnet are provided. For S)nnmetric magnets, only... 

An attempt was made to match the field test responses by adjusting the initial stresses in the model. It was concluded that it is possible to produce increasing pressure peaks at 714 and 738 hours in interval P4 by changing orientation and magnitude of the stress field. Basically, the vertical stress had to be substantially increased such that the TBM drilling produces a mean stress increases on the side of the tunnel. Figure 8 presents one example in which the in situ stress field has been rotated in order to match simulated and measured fluid pressure responses. 

As mentioned above, the interpretation of CL cannot be unified under a simple law, and one of the fundamental difficulties involved in luminescence analysis is the lack of information on the competing nonradiative processes present in the material. In addition, the influence of defects, the surface, and various external perturbations (such as temperature, electric field, and stress) have to be taken into account in quantitative CL analysis. All these make the quantification of CL intensities difficult. Correlations between dopant concentrations and such band-shape parameters as the peak energy and the half-width of the CL emission currently are more reliable as means for the quantitative analysis of the carrier concentration. 

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