224 research outputs found
Understanding the Effect of Individual Differences on Second Language Acquisition: Focusing on Personality
In this world, the most obvious difference between people is the difference in appearance. In its simplest aspect, we know that everyone in this world is unique. Definitely, in the aspect of learning, the learning outcome of each student is different. Even based on the same age, same subject, same teacher, same gender, the results of learning are different. This makes it necessary to study individual differences in learning. As a second language teacher, it is necessary to study the impact of individual differences on second language acquisition.
This field project mainly discusses the effect of individual differences on second language acquisition focusing on the personality factor. The problem is most second language teachers were not trained in relevant knowledge of educational psychology before they became the certificated teacher. Second language teachers can instinctively know that every student’s learning behavior is different, but they don’t have the basic theoretical knowledge to rely on.
In this case, the purpose of this project is to provide the basic information of educational psychology to second language teachers. To be a bridge between second language teachers and educational psychology and help them to learn another interdisciplinary knowledge for becoming a better teacher
Field theory for mechanical criticality in disordered fiber networks
Strain-controlled criticality governs the elasticity of jamming and fiber
networks. While the upper critical dimension of jamming is believed to be
=2, non mean-field exponents are observed in numerical studies of 2D and
3D fiber networks. The origins of this remains unclear. In this study we
propose a minimal mean-field model for strain-controlled criticality of fiber
networks. We then extend this to a phenomenological field theory, in which non
mean-field behavior emerges as a result of the disorder in the network
structure. We predict that the upper critical dimension for such systems is
=4 using a Gaussian approximation. Moreover, we identify an order
parameter for the phase transition, which has been lacking for fiber networks
to date
Effective Medium Theory for Mechanical Phase Transitions of Fiber Networks
Networks of stiff fibers govern the elasticity of biological structures such
as the extracellular matrix of collagen. These networks are known to stiffen
nonlinearly under shear or extensional strain. Recently, it has been shown that
such stiffening is governed by a strain-controlled athermal but critical phase
transition, from a floppy phase below the critical strain to a rigid phase
above the critical strain. While this phase transition has been extensively
studied numerically and experimentally, a complete analytical theory for this
transition remains elusive. Here, we present an effective medium theory (EMT)
for this mechanical phase transition of fiber networks. We extend a previous
EMT appropriate for linear elasticity to incorporate nonlinear effects via an
anharmonic Hamiltonian. The mean-field predictions of this theory, including
the critical exponents, scaling relations and non-affine fluctuations
qualitatively agree with previous experimental and numerical results
Recommended from our members
Enhancing shift current response via virtual multiband transitions
Materials exhibiting a significant shift current response could potentially outperform conventional solar cell materials. The myriad of factors governing shift-current response, however, poses significant challenges in finding such strong shift-current materials. Here we propose a general design principle that exploits inter-orbital mixing to excite virtual multiband transitions in materials with multiple flat bands to achieve an enhanced shift current response. We further relate this design principle to maximizing Wannier function spread as expressed through the formalism of quantum geometry. We demonstrate the viability of our design using a 1D stacked Rice-Mele model. Furthermore, we consider a concrete material realization - alternating angle twisted multilayer graphene (TMG) - a natural platform to experimentally realize such an effect. We identify a set of twist angles at which the shift current response is maximized via virtual transitions for each multilayer graphene and highlight the importance of TMG as a promising material to achieve an enhanced shift current response at terahertz frequencies. Our proposed mechanism also applies to other 2D systems and can serve as a guiding principle for designing multiband systems that exhibit an enhanced shift current response
- …