1,419,825 research outputs found
Solutions of in
Though it is well known that the roots of any affine polynomial over a finite
field can be computed by a system of linear equations by using a normal base of
the field, such solving approach appears to be difficult to apply when the
field is fairly large. Thus, it may be of great interest to find an explicit
representation of the solutions independently of the field base. This was
previously done only for quadratic equations over a binary finite field. This
paper gives an explicit representation of solutions for a much wider class of
affine polynomials over a binary prime field
Magnetic reversals in a simple model of MHD
We study a simple magnetohydrodynamical approach in which hydrodynamics and
MHD turbulence are coupled in a shell model, with given dynamo constrains in
the large scales. We consider the case of a low Prandtl number fluid for which
the inertial range of the velocity field is much wider than that of the
magnetic field. Random reversals of the magnetic field are observed and it
shown that the magnetic field has a non trivial evolution linked to the nature
of the hydrodynamics turbulence.Comment: 4 pages, submitted to PR
Dynamical behavior across the Mott transition of two bands with different bandwidths
We investigate the role of the bandwidth difference in the Mott
metal-insulator transition of a two-band Hubbard model in the limit of infinite
dimensions, by means of a Gutzwiller variational wave function as well as by
dynamical mean-field theory. The variational calculation predicts a two-stage
quenching of the charge degrees of freedom, in which the narrower band
undergoes a Mott transition before the wider one, both in the presence and in
the absence of a Hund's exchange coupling. However, this scenario is not fully
confirmed by the dynamical mean-field theory calculation, which shows that,
although the quasiparticle residue of the narrower band is zero within our
numerical accuracy, low-energy spectral weight still exists inside the
Mott-Hubbard gap, concentrated into two peaks symmetric around the chemical
potential. This spectral weight vanishes only when the wider band ceases to
conduct too. Although our results are compatible with several scenarios, e.g.,
a narrow gap semiconductor or a semimetal, we argue that the most plausible one
is that the two peaks coexist with a narrow resonance tied at the chemical
potential, with a spectral weight below our numerical accuracy. This
quasiparticle resonance is expected to vanish when the wider band undergoes the
Mott transition.Comment: 11 pages, 12 figure
Database Engines for Geographical Information Systems
Our ability to identify, acquire, store, enquire on and analyse data is increasing as never before, especially in the GIS field. Technologies are becoming available to
manage a wider variety of data and to make intelligent inferences on that data.
The mainstream arrival of large-scale database engines is not far away. The experience of using the first such products tells us that they will radically change data
management in the GIS field
Fly on the wall: can students' learning be enhanced by allowing them to witness their own summative assessment and feedback event?
The Design studio learning system within New Zealand Tertiary Design Schools has a unique critique method, (often called 'The Crit'); The Crit event itself is rather a 'veiled' process and has been analyzed and written about extensively. There has also been some negative feedback from students that this form of critiquing process is not necessarily a good type of feedback process. Is there a method that protects the student's privacy related to his or her own design work and at the same time maintains the Design School's integrity of supplying reasoned and fair assessment within the wider Profession? A field trial scenario was designed and arranged with a group of volunteer design students, so each in turn, could sit-in and witness their own assessment / feedback session. This paper reports on this field trial, (timed to occur after the critique). This paper analyses this experiment, exploring the field trial responses, looking for links within a wider Educational literature base to the ground this 'Fly on the Wall' scenario within known pedagogies. NB. This scenario is not proposing to supplant 'The Crit,' rather the intention being in addition to it
How to Solve Quantum Nonlinear Abelian Gauge Theory in Two Dimension in the Heisenberg Picture
The new method based on the operator formalism proposed by Abe and Nakanishi
is applied to the quantum nonlinear abelian gauge theory in two dimension. The
soluble models in this method are extended to wider class of quantum field
theories. We obtain the exact solution in the canonical-quantization operator
formalism in the Heisenberg picture. So this analysis might shed some light on
the analysis of gravitational theory and non-polynomial field theories.Comment: LaTeX, 12 pages, to be published in IJMP
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