Classical analog to topological nonlocal quantum interference effects

The two main features of the Aharonov-Bohm effect are the topological dependence of accumulated phase on the winding number around the magnetic fluxon, and nonlocality-local observations at any intermediate point along the trajectories are not affected by the fluxon. The latter property is usually regarded as exclusive to quantum mechanics. Here we show that both the topological and nonlocal features of the Aharonov-Bohm effect can be manifested in a classical model that incorporates random noise. The model also suggests new types of multiparticle topological nonlocal effects which have no quantum analog.     

"Weighing" a closed system and the time-energy uncertainty principle

A gedanken experiment is proposed for "weighing" the total mass of a closed system from within the system. We prove that for an internal observer the time tau, required to measure the total energy with accuracy DeltaE, is bounded according to tauDeltaE>Planck's over 2pi. This time-energy uncertainty principle for a closed system follows from the measurement backreaction on the system. We generally examine what other conserved observables are in principle measurable within a closed system and what are the corresponding uncertainty relations.     

Photostability and Photoinduced Processes in CuInS2/ZnS Quantum Dots and Their Hybrid Structures with Multilayer Graphene Nanoribbons

Optics and Spectroscopy - The photostability of the luminescent properties of CuInS2/ZnS quantum dots (CIS/ZnS QDs) as a monolayer on a dielectric substrate and as part of a hybrid structure with...     

Determination of Electrophysical Parameters of a Semiconductor from Measurements of the Microwave Spectrum of Coaxial Probe Impedance

Technical Physics - We propose a method for determining electrophysical characteristics (free charge carrier concentration, mobility, and conductivity) of semiconductors from the results of...     

Analysis of Creep Strains and Stress Relaxation in Thin-Walled Tubular Members Made of Linear Viscoelastic Materials. 1. Superposition of Shear and Volume Creep

International Applied Mechanics - The problem of creep strains and stress relaxation analysis in thin-walled tubular members made of linear viscoelastic materials under combined tension and torsion...     

Luminescent and Photoelectric Properties of Hybrid Structures Based on Multilayer Graphene and 0D and 2D Semiconductor Quantum Nanocrystals

Optics and Spectroscopy - Determination of regular features of mechanisms underlying interactions of nanostructured materials is one of the most important problems on the way to create the new...     

Synthesis and antimycobacterial activity of some benzyl- and methylisocyanurate derivatives

Russian Chemical Bulletin - Alkylation of methyl thioglycolate with ω-(haloalkyl) derivatives of 1-benzyland 1-methylisocyanurates yielded...     

Permeability of anti-fouling PEGylated surfaces probed by fluorescence correlation spectroscopy

The present work reports on in situ observations of the interaction of organic dye probe molecules and dye-labeled protein with different poly(ethylene glycol) (PEG) architectures (linear, dendron, and bottle brush). Fluorescence correlation spectroscopy (FCS) and single molecule event analysis were used to examine the nature and extent of probe-PEG interactions. The data support a sieve-like model in which size-exclusion principles determine the extent of probe-PEG interactions. Small probes are trapped by more dense PEG architectures and large probes interact more with less dense PEG surfaces. These results, and the tunable pore structure of the PEG dendrons employed in this work, suggest the viability of electrochemically-active materials for tunable surfaces.     

Spectral study of the molecular structure of some 2-methylthio-6-methyl-4-alkyl- and alkylaminopyrimidines

A number of 2-methylthio-6-methyl-4-alkyl- and alkylaminopyrimidines, as well as their salts produced by the reaction with methyl p-toluenesulfonate and trifluoroacetic acid, were investigated. The quantum chemical and experimental IR and Raman spectral methods were used to determine the preferential isomeric forms of the molecules of studied compounds, whose convenient spectral markers were revealed. The starting pyrimidines and their salts were found to exist predominantly as an amino form. The salt formation proceeds via the methylation (protonation) of the N¹ atom of pyrimidine ring.