The nonlinear mean-field dynamo due to a shear-current effect in a nonhelical homogeneous turbulence with a mean velocity shear is discussed. The transport of magnetic helicity as a dynamical nonlinearity is taken into account. The shear-current effect is associated with the W×J term in the mean electromotive force, where W is the mean vorticity due to the large-scale shear motions and J is the...

We propose a new mechanism for a turbulent mean-field dynamo in which the magnetic fluctuations resulting from a small-scale dynamo drive the generation of large-scale magnetic fields. This is in stark contrast to the common idea that small-scale magnetic fields should be harmful to large-scale dynamo action. These dynamos occur in the presence of a large-scale velocity shear and do not require...

To investigate seismic performance of beam-column knee joints, four full-scale reinforced concrete beam-column knee joints, which were fabricated to simulate those in as-built RC frame buildings designed to ACI 318-14 and ACI-ASCE 352R-02, were tested under reversed cyclic loading. In the experimental programme, particular emphasis was given to the effect of horizontal reinforcement (in format ...

The interface friction between geosynthetics has previously been extensively studied with reference to medium-high contact stresses. strength at low stress is a less investigated chapter whose importance, however, evident for the stability of geosynthetic landfill barriers during construction stage and covering systems. inclined plane most used laboratory test measuring normal stresses as 5 kPa...

This investigation was aimed at studying the effect of test methods on bond strength between concrete substrate and repair material. Four test methods with cementations or modified-cementations repair materials, and two surface roughnesses were studied. The methods used were pull-off, slant shear, splitting prism and a new direct shear named Bi-Surface shear test. While the coefficient of varia...

The regional research is conducted on the mechanical properties and performance of loess in slop northern Shaanxi Province, China. On precondition conforming to related technical regulations, equipment was purchased or selfdesigned machined conduct large-scale in-situ direct shear test participatory a high slope Through multiple field tests red soils four-level platform side engineering tunnel,...