Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 66 for “"Non-adiabatic"”.
-
A study of non-adiabatic baroclinic instability
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmosphere and Planetary Sciences, 1988.
-
Simulating and controlling non-adiabatic effects in ultrafast photochemistry
… many photochemical processes are dominated by non-adiabatic effects, such as conical intersections. The study of such reactions is therefore vital to our understanding of many fundamental processes and the interesting topological features which cause them. The photophysics and photochemistry of …
-
The scattering of charged particles by non-adiabatic magnetic fields
Thesis: M.S., Massachusetts Institute of Technology, Department of Physics, 1964
-
Non-adiabatic electron-ion dynamics in semiconductors under ionizing particle irradiation
… stopping. Specifically for this phenomenon, larger electronic stopping for channeling heavy ions is attributed to larger equilibrium charge. Overall, we discover several mechanisms that challenge the current understandings of interaction between energetic ions and target materials. …
-
Non-adiabatic features in magnetotail fast flows: Orbit tracing and data comparisons
… functions that show clear evidence of non-adiabatic features that depend on the electric field characteristic width. Several years of Geotail Comprehensive Plasma Instrumentation (CPI) data were subsequently examined to find data sets for comparison. Four events out of more than twenty …
-
Studies of non-adiabatic pulsations in the atmospheres of the roAp stars
The roAp stars are high overtone pulsators characterised by strong global magnetic fields with effective field strength of between a few hundred to a few thousand Gauss. They also show overabundances in rare-earths and iron peak element. Multi-colour photometry of roAp stars shows that their …
-
Four-Wave Mixing Techniques Applied to the Investigation of Non-Adiabatic Dynamics in Polyatomic Molecules
… as the energetic aspects of vibronic coupling in non-radiative transitions of polyatomic molecules to be addressed. This was achieved by utilizing the influence of optical as well as Raman resonances on four-wave mixing processes. These resonance effects on third-order, optical processes allow for …
-
Characterization and design of non-adiabatic micro-compressor impeller and preliminary design of self-sustained micro engine system
As part of the MIT research program on micro-engines (of size [approximately] 1 cm), this thesis defines concepts and designs to improve micro-turbomachinery and overall system performance. Three-dimensional Reynolds-averaged Navier-Stokes computations (FLUENT) have been carried out to quantify the …
-
A theoretical study of stellart pulsations in young brown dwarfs
… a twofold study on the recently proposed phenomenon of ‘stellar pulsations’ in young brown dwarfs by the seminal study of Palla and Baraffe (2005) (PB05, thereafter). The PB05 study presents results of a non-adiabatic linear stability analysis showing that young brown dwarfs should become …
-
Flames in Thin Channels
Finally, the flame front propagation in an adiabatic non-energetic channel is investigated. Specifically, the interaction of the flame front with the flow inside the channel is studied and the focus is to assess the thermal-expansion influence. It is found that thermal expansion enhances the …
-
Controlling Molecular-Scale Motion: Exact Predictions for Driven Stochastic Systems
… the world. Many of these molecular complexes are non-autonomous in that they are manipulated by external stimuli. As these devices become more sophisticated, the need for a theoretical framework to describe them becomes more important. Many non-autonomous molecular machines are modeled as …
-
Analyses of Bluff Body and Swirl-Stabilised Flames Using Large Eddy Simulation
… framework. One of these two cases uses a non-adiabatic flamelet approach, where its implementation is outlined in this work. Improvements in the near-wall temperature distribution are seen, owing to the inclusion of non-adiabatic wall conditions. The non-adiabatic flamelet simulation over …
-
Topological Signatures for the Kitaev Chain in and out of Equilibrium
… aspects of the topological properties and non-equilibrium dynamics of one-dimensional quadratic fermionic systems, with a primary focus on the Kitaev chain and related lattice models. A unified theoretical framework is developed based on quadratic Hamiltonians, their diagonalisation, and …
-
Close-Coupling Calculations for NaAr, NaNe, and NaHe
<p>The non-adiabatic close-coupled theory, developed by Mies and by George, is employed in a time-independent molecular calculation for Na-rare gas collisions in a radiations field. The intensity of the Na D1/D2 lines is calculated for both blue- and red-wing excitation and is in good agreement …
-
Vibrationally enhanced associative photodesorption of H2 (D2) from Ru(0001) : quantum and classical approaches
… and D$_2$, (ii) the desorption yield increases non-linearly with the applied visible (vis) laser fluence, and (iii) unequal energy partitioning to different degrees of freedom. These peculiarities are due to the fact that an ultrashort vis pulse creates hot electrons in the metal. These hot …
-
Application of an empirically-derived polytropic index for the solar wind to a solar wind shock propagation model
… free-streaming solar wind. Application of this non-adiabatic polytropic index to a two-dimensional solar wind computer model to simulate the effects of thermal heat conduction has been investigated. The current project involves the insertion of this empirically-derived polytropic index into a …
-
Quantum Dynamics of Strong Field Light-Matter Interactions
… of the competing theories.We also identified a non-adiabatic contribution to tunneling ionization, an effect neglected in strong field light-matter interaction studies so far. Our calculations strongly suggest that this non-adiabatic correction to the tunneling ionization can be significant even …
Page 1 of 4