scholarly journals Insight into phonon scattering in Si nanowires through high-field hole transport: Impacts of boundary condition and comparison with bulk phonon approximation

2017 ◽  
Vol 864 ◽  
pp. 012046 ◽  
Author(s):  
H Tanaka ◽  
J Suda ◽  
T Kimoto
Keyword(s):  
Boundary Condition ◽  
High Field ◽  
Phonon Scattering ◽  
Hole Transport ◽  
Si Nanowires ◽  
Bulk Phonon ◽  
Insight Into

High-field hole transport in strained InxGa1-xAs/GaAs modulation-doped quantum wells

1990 ◽  
Vol 5 (6) ◽  
pp. 628-630 ◽  
Author(s):  
M Reddy ◽  
R Grey ◽  
P A Claxton ◽  
J Woodhead
Keyword(s):  
Quantum Wells ◽  
High Field ◽  
Hole Transport

New insight into high-field mobility enhancement of nitrided-oxide N-MOSFET's based on noise measurement

1994 ◽  
Vol 41 (11) ◽  
pp. 2205-2209 ◽  
Author(s):  
Z.J. Ma ◽  
Z.H. Liu ◽  
Yiu Chung Cheng ◽  
P.K. Ko ◽  
Chenming Hu
Keyword(s):  
High Field ◽  
Noise Measurement ◽  
Field Mobility ◽  
Insight Into

Effects of Non-Uniform Combustor Exit Flow on Turbine Aerodynamics

2012 ◽  
Author(s):  
Stavros Pyliouras ◽  
Heinz-Peter Schiffer ◽  
Erik Janke ◽  
Lars Willer
Keyword(s):  
Boundary Condition ◽  
Test Rig ◽  
Lean Burn ◽  
Lean Combustion ◽  
Flow Mechanisms ◽  
Low Nox Combustion ◽  
Inhomogeneous Temperature ◽  
The Impact ◽  
Inlet Boundary Condition ◽  
Insight Into

Very-low NOx combustion concepts require a high swirl number of the flow in the combustion chamber to allow for lean burn combustion. This article deals with the influence of the resulting combustor exit swirl on the turbine aerodynamics of the first stage. This investigation is based on numerical simulations. According to the literature research additional insight into combustor-turbine interaction is achieved by taking into account a fully two dimensional inlet boundary condition. Up to now published results on combustor-turbine interaction were mostly restricted to the inhomogeneous temperature distribution at the turbine inlet. The investigations are carried out on a real engine geometry — the E3E Core 3/2 — a research project of Rolls-Royce Deutschland on lean combustion. Calculations are conducted by means of the Rolls-Royce plc code Hydra. The swirled inlet boundary condition is further scaled to test rig conditions to check for the transferability between the test rig and the real engine geometry. The results show a significant impact of the inhomogeneous turbine inflow on the stage efficiency and the thermal load. The optimization potential due to the clocking position of the combustor swirl is analyzed. The impact on the secondary flow mechanisms is analyzed with a novel visualization technique. A frequency spectrum analysis is carried out to investigate the effects of the 2D inlet boundary condition on the rotor row.

Theory of Thermal Conductivity of Micro- and Nano-structured Materials

2009 ◽  
Vol 1172 ◽  
Author(s):  
Gyaneshwar P. Srivastava
Keyword(s):  
Thermal Conductivity ◽  
Lattice Thermal Conductivity ◽  
Phonon Scattering ◽  
Polycrystalline Diamond ◽  
Comprehensive Treatment ◽  
Si Nanowires ◽  
Quantitative Investigation ◽  
Debye Relaxation ◽  
Structured Materials ◽  
20 Nm

AbstractWe provide a brief discussion of the Boltzmann equation derived Callaway-Debye relaxation time theory of lattice thermal conductivity of micro- and nano-structured materials (of size greater than 20 nm. Incorporated in the theory is a comprehensive treatment of three-phonon scattering events. Using numerical results from this theory, we present a quantitative investigation of the magnitude and temperature variation of the conductivity of CVD polycrystalline diamond films, suspended GaAs nanostructures, Si nanowires, and AlN micro- and nano-ceramics.

scholarly journals High-Field Hole Transport in Strained Si and SiGe by Monte Carlo Simulation: Full Band Versus Analytic Band Models

VLSI Design ◽  
1998 ◽  
Vol 8 (1-4) ◽  
pp. 41-45 ◽  
Author(s):  
F. M. Bufler ◽  
P. Graf ◽  
B. Meinerzhagen
Keyword(s):  
Monte Carlo ◽  
Drift Velocity ◽  
High Field ◽  
Hole Transport ◽  
Band Model ◽  
Strained Si ◽  
Saturation Velocity ◽  
Full Band ◽  
Structure Description ◽  
Strained Sige

Monte Carlo results are presented for the velocity-field characteristics of holes in (i) unstrained Si, (ii) strained Si and (iii) strained SiGe using a full band model as well as an analytic nonparabolic and anisotropic band structure description. The full band Monte Carlo simulations show a strong enhancement of the drift velocity in strained Si up to intermediate fields, but yield the same saturation velocity as in unstrained Si. The drift velocity in strained SiGe is also significantly enhanced for low fields while being substantially reduced in the high-field regime. The results of the analytic band models agree well with the full band results up to medium field strengths and only the saturation velocity is significantly underestimated.

scholarly journals Simulation of a Solvate Ionic Liquid at a Polarisable Electrode with a Constant Potential

2018 ◽  
Author(s):  
Samuel W. Coles ◽  
Vladislav Ivanistsev
Keyword(s):  
Boundary Condition ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Surface Charge ◽  
Computational Studies ◽  
Lithium Ions ◽  
Liquid Electrode ◽  
Constant Potential ◽  
Electrode Interface ◽  
Insight Into

<div>In this article we discuss the nanostructure and calculated the capacitance of a solvate ionic liquid–electrode interfaces, where the electrode has a constant potential, and is thus inherently polarisable. Lithium ions from the lithium</div><div>glyme solvate ionic liquid are found within 0.5 nm of the electrode at all voltages studied, however, their solvation environment varies with voltage. Our study provides molecular insight into the electrode interface of solvate ionic liquids, with many features similar to pure ionic liquids. A comparison with previous studies of the same electrolyte using the fixed surface charge boundary condition is also illuminating, informing future computational studies of electrolyte–electrode interfaces.</div>

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