نتایج جستجو برای: tunnelling
تعداد نتایج: 4451 فیلتر نتایج به سال:
Abstract We reconsider the problem of the enhancement of tunnelling of a quantum particle induced by disorder of a one-dimensional tunnel barrier of length L, using two different approximate analytic solutions of the invariant imbedding equations of wave propagation for weak disorder. The two solutions are complementary for the detailed understanding of important aspects of numerical results on...
Theoretical models have been used to derive rate coefficients for the unimolecular reaction pathways of two prototypical alkoxyl radicals (1-butoxyl and 2-pentoxyl) which can undergo 1,5 H-shift isomerisation yielding the corresponding delta-hydroxy alkyl radical. Special emphasis has been given to the contribution of tunnelling in the isomerisation channels which has not been accounted for in ...
Defects play a key role in determining the properties and technological applications of nanoscale materials and, because they tend to be highly localized, characterizing them at the single-defect level is of particular importance. Scanning tunnelling microscopy has long been used to image the electronic structure of individual point defects in conductors, semiconductors and ultrathin films, but...
Mechanised tunnelling is characterised by a number of interacting components relevant for the excavation process (the soil including groundwater, the TBM, the linings, the support at the cutting face and the tail void) and by a staged process of excavation and lining erection. This imposes a considerable challenge for realistic modelling of the tunnelling process. The paper addresses recent adv...
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