Silencing a quantum drum

Marching to a different drum

Since December 1993, elections have been ‘the only game in town’ for the legitimate transfer of political power in Russia. That has led politicians – and the Kremlin itself – to targeting specifically the military servicemen as an electorate. The large number of people associated with the military in one way or another in Russia makes it reasonable for politicians to consider the military a par...

Sounds from a different drum.

Quantum current modeling in nano-transistors with a quantum dot

Carbon quantum dots (CQDs) serve as a new class of ‘zero dimensional’ nanomaterial’s in thecarbon class with sizes below 10 nm. As light emitting nanocrystals, QDs are assembled from semiconductormaterials, from the elements in the periodic groups of II-VI, III-V or IV-VI, mainly thanks to impacts of quantum confinement QDs have unique optical properties such as brighter, highly pho...

Boiler Drum-level Modeling

In this paper, a mathematical model is developed to describe the dynamics of the drum-level of a natural circulation boiler. A boiler-drum is divided into two parts; the upper part contains saturated steam while the lower part contains a steam/water mixture. The ratio of the steam in that mixture is defined in this work as the steam volumetric ratio. On the other hand, balance equations are app...

Where Best to Hold a Drum Fast

Abstract. If we are allowed to fasten, say, one half of a drum’s boundary, which half produces the lowest or highest bass note? The answer is a natural limit of solutions to a family of extremal Robin problems for the least eigenvalue of the Laplacian. We produce explicit extremizers when the drum is a disk while for general shapes we establish existence and necessary conditions, and we build a...