Electronic properties of Luttinger Liquid with electron-phonon interaction

This thesis addresses a theoretical study of the problem of a single impurity embedded in a one-dimensional system of interacting electrons in presence of electron-phonon coupling. First we consider a system with a featureless point-like potential impurity, followed by the case of a resonant level hybridised with a Luttinger Liquid. The stress is made on a more fundamental problem of a featureless scatterer, for which two opposite limits in the impurity strength are considered: a weak scatterer and a weak link. We have found that, regardless of the transmission properties of phonons through the impurity, the scaling dimensions of the conductance in these limits obey the duality condition, $\triangle_{WS}$ $\triangle_{WL}$ = 1, known for the Luttinger Liquid in the absence of phonons. However, in the case when the strength of phonon scattering is correlated with electron scattering by the impurity, we find a nontrivial phase diagram with up to three fixed points and a possibility of a metal-insulator transition. We also consider the case of a weakly interacting electron-phonon system in the presence of a single impurity of an arbitrary scattering potential. In the problem of a resonant level attached to the Luttinger Liquid we show that the electron-phonon coupling significantly modifies the effective energy-dependent width of the resonant level in two different geometries, corresponding to the resonant and anti-resonant transmission in the Fermi gas

Use of models of vehicle´s kinetic energy recovery

Analýza aplikace konkrétního modelu rekuperace kinetické energie vozidel.Analysis of concrete model application of vehicle's kinetic energy regeneration.

Design of hydraulic travel of reaper`s drive unit

Cílem mé bakalářské práce je návrh hydraulického pojezdu univerzální pohonné jednotky žacího stroje na základě provedené rešerše s těmito parametry: nezávislý pohon kol, plynulá regulace rychlosti vpřed i vzad, rychlost 0-10 km/h. Na pohon stroje je použit motor Briggs&Stratton I/C OHV AVS s výkonem 8,46 kW. Požadavek společnosti Dakr, s.r.o, bylo, že na pohon má být použito přibližně 20% výkonu motoru.The goal of my bachelor work is Design of hydraulic travel of reaper`s drive unit on exploration of facts with these parameters: independent wheel drive, fluent speed regulation in both forward and reverse motion, speed 0-10 km/h. Briggs&Stratton I/C OHV AVS engine is used for working the machine. It's output is 8,46 kW. Dakr, s.r.o, company demanded, that approximately 20% of engines output is to be used for driving.

Solidification of high speed steels: the effects of Mo and W on the freezing process and eutectic carbide morphology

A series of allows ranging between the M2 and M10 compositions contined similar volume percentages of feather eutectic, but M10 had 2 1/2 times more isolated MC in its as-cast structure than M2