399 research outputs found
Disorder-driven transition to tubular phase in anisotropic two-dimensional materials
We develop a theory of anomalous elasticity in disordered two-dimensional
flexible materials with orthorhombic crystal symmetry. Similar to the clean
case, we predict existence of infinitely many flat phases with anisotropic
bending rigidity and Young's modulus showing power-law scaling with momentum
controlled by a single universal exponent the very same as in the clean
isotropic case. With increase of temperature or disorder these flat phases
undergo crumpling transition. Remarkably, in contrast to the isotropic
materials where crumpling occurs in all spatial directions simultaneously, the
anisotropic materials crumple into tubular phase. In distinction to clean case
in which crumpling transition happens at unphysically high temperatures, a
disorder-induced tubular crumpled phase can exist even at room-temperature
conditions. Our results are applied to anisotropic atomic single layers doped
by adatoms or disordered by heavy ions bombarding.Comment: 18 LaTex pages, 6 figure
Underbarrier nucleation kinetics in a metastable quantum liquid near the spinodal
We develop a theory in order to describe the effect of relaxation in a
condensed medium upon the quantum decay of a metastable liquid near the
spinodal at low temperatures. We find that both the regime and the rate of
quantum nucleation strongly depend on the relaxation time and its temperature
behavior. The quantum nucleation rate slows down with the decrease of the
relaxation time. We also discuss the low temperature experiments on cavitation
in normal He and superfluid He at negative pressures. It is the sharp
distinctions in the high frequency sound mode and in the temperature behavior
of the relaxation time that make the quantum cavitation kinetics in He and
He completely different in kind.Comment: 10 pages, 2 figure
Creating a Prototype of the Information-Analytical System of Rating Countries in the Field of AML/CFT for Compliance with 40 FATF Recommendations
The article provides an example of implementing the cluster analysis algorithm for an information and analytical system in order to identify various patterns in the participating countries, basing on the process of assessing the effectiveness and technical compliance of the FATF member countries and FATF-style regional groups.Keywords: FATF, information and analytical system, FATF recommendations, efficiency evaluation, technical conformity assessment, cluster analysis, data mining
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