Centrifuge Modelling

High-speed centrifuge Model CM-60 (Tomy Seiko Co., Japan)... 

Usually DNA precipitated by the addition of ethanol is recovered by centrifuging in an Eppendorf centrifuge (Model 5412) at... 

Eppendorf Centrifuge Models 5412 and 5413 Obtainable from Anderman Laboratory Supplies Division, Central Avenue, East Molesey, Surrey KT8 OQZ, U.K. 

Dixon, J. M. Summers, J. M. 1983. Patterns of total and incremental strain in subsiding troughs experimental centrifuged models of inter-diapir synclines. Canadian Journal of Earth Sciences, 20,1843-1861. 

To address the first issue, the current centrifuge models manufactured by Thermo Savant, Christ, and Genevac use IR lamps, which are located in the walls of the vacuum chamber, or in the lid in the case of the Hettich IR-Dancer and CombiDancer shakers. The Syncore Polyvap (Biichi) is different from all other... 

However, Bringer s conclusion is at variance with the results of Band et al. [624]. It is also important to note that the centrifugal model does not require the occurrence of two distinct potential wells for orbital contraction to take place it is sufficient that there should be an inner potential well of finite range, connected to an outer well of much longer range. The main influence of the barrier (when it occurs) is to ensure a fuller spatial segregation of the collapsed and decollapsed states. This is how the Hartree-Fock version of the Mayer-Fermi theory for free atoms accounts for d-electron contraction, in which case a repulsive barrier actually does not form, and localisation becomes even more term- and configuration-dependent. 

A 5000 r.p.m. centrifuge (International Equipment Company, centrifuge model 428)... 

It would also be possible to apply other displacement profiles, provided that the assumed shape is appropriate to the problem analysed. In practice reasonable displacement can be obtained from theoretical considerations, past measurements of soil movement by inclinometers (Stewart et al. 1994), and by centrifuge models as in the work of Ong et al. (2003) in their study of excavation-induced soil movement reproduced here as Figure 8.4. 

Methodology and Experimental Equipment 23.2.1 Soil Behavior and Centrifuge Modelling... 

Centrifuge Modeling of Liquefaction Effects on Shallow Foundations... 

Fig. 24.2 Centrifuge model layout in experiment CT-A (cross section view)...

Centrifuge model CT-C (Fig. 24.4) tests different configurations for the hybrid resistance measure initially tested in model CT-B, to evaluate the influence on the performance. As the figure shows, the geotextile extends in both cases to half the depth of the liquefiable deposit (9 m) while the narrow densified column encased in the geotextile extends to the bottom of the liquefiable layer, in one case, and to the same depth as the geotextile in the other. 

The amount, distribution and placement of the instruments installed in the centrifuge models and the flexibility of the coimecting cables are carefully chosen to minimize the disturbance on soil behavior. In general, large concentration of instruments was avoided and cables were positioned so that soil reinforcement and creation of preferential flow paths was hampered. The loading of the model was carefully performed to minimize the 1-g vibrations induced in the model, which could affect the instruments position. 

All the centrifuge models were submitted to a similar input seismic motion at the base, applied parallel to the long side of each model and designed to replicate a relatively strong real earthquake motion, planned to last about 25 s, have a predominant frequency of 1 Hz and impose maximum peak horizontal accelerations close to 0.3-g. 

The time histories and FFTs of the earthquake simulations applied to the centrifuge models are depicted in Fig. 24.9, confirming that the planned loading was achieved in tests CT-B and CT-C. Although the input simulation in test CT-A was not measured, due to an instrument malfunction, there is no reason to believe this simulation was different. It should also be noted that the seismic simulation is not single-frequency, although as required the predominant frequency matches the desired value (1 Hz). 

Yang, Q.H., Yao, L.K., Ren, Z.M.. 2008. Centrifugal model test on dynamical characteristics of landslips of loose slope under seismic loading. Chinese Journal of Rock Mechanics and Engineering, 27(2) 368-374. 

Deformation and failure pattern of cohesive slopes reinforced with different materials Centrifuge modeling study... 

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