Two-dimensional electrostatic force field measurements with simultaneous topography measurement on embedded interdigitated nanoelectrodes using a force distance curve based method

2008 ◽  
Vol 92 (6) ◽  
pp. 063113 ◽  
Author(s):  
Martin Günter Jenke ◽  
Christian Santschi ◽  
Patrik Hoffmann
Keyword(s):  
Force Field ◽  
Electrostatic Force ◽  
Field Measurements ◽  
Two Dimensional ◽  
Distance Curve

scholarly journals Stochastic marine ice sheet variability

2018 ◽  
Vol 843 ◽  
pp. 748-777 ◽  
Author(s):  
T. E. Mulder ◽  
S. Baars ◽  
F. W. Wubs ◽  
H. A. Dijkstra
Keyword(s):  
Transition Probabilities ◽  
Accumulation Rate ◽  
Ice Sheets ◽  
Ice Sheet ◽  
Field Measurements ◽  
Multiple Equilibrium ◽  
Short Time Scale ◽  
Two Dimensional ◽  
Grounding Line ◽  
Short Time

It is well known that deterministic two-dimensional marine ice sheets can only be stable if the grounding line is positioned at a sufficiently steep, downward sloping bedrock. When bedrock conditions favour instabilities, multiple stable ice sheet profiles may occur. Here, we employ continuation techniques to examine the sensitivity of a two-dimensional marine ice sheet to stochastic noise representing short time scale variability, either in the accumulation rate or in the sea level height. We find that in unique regimes, the position of the grounding line is most sensitive to noise in the accumulation rate and can explain excursions observed in field measurements. In the multiple equilibrium regime, there is a strong asymmetry in transition probabilities between the different ice sheet states, with a strong preference to switch to the branch with a steeper bedrock slope.

Fast Electrostatic Force and Moment Calculations in Multibody-Based Simulations of Coarse-Grained Biopolymers

2011 ◽  
Author(s):  
Mohammad Poursina ◽  
Jeremy Laflin ◽  
Kurt S. Anderson
Keyword(s):  
Force Field ◽  
Long Range ◽  
Electrostatic Force ◽  
Center Of Mass ◽  
Computational Cost ◽  
Field Approximation ◽  
The Body ◽  
Divide And Conquer ◽  
Coarse Grained ◽  
Coarse Grain

In molecular simulations, the dominant portion of the computational cost is associated with force field calculations. Herein, we extend the approach used to approximate long range gravitational force and the associated moment in spacecraft dynamics to the coulomb forces present in coarse grained biopolymer simulations. We approximate the resultant force and moment for long-range particle-body and body-body interactions due to the electrostatic force field. The resultant moment approximated here is due to the fact that the net force does not necessarily act through the center of mass of the body (pseudoatom). This moment is considered in multibody-based coarse grain simulations while neglected in bead models which use particle dynamics to address the dynamics of the system. A novel binary divide and conquer algorithm (BDCA) is presented to implement the force field approximation. The proposed algorithm is implemented by considering each rigid/flexible domain as a node of the leaf level of the binary tree. This substructuring strategy is well suited to coarse grain simulations of chain biopolymers using an articulated multibody approach.

Low-dimensional projection approach for efficient sampling of molecular recognition and polymer aggregation

2020 ◽  
Vol 22 (13) ◽  
pp. 6953-6963
Author(s):  
Hiroya Nakata ◽  
Cheol Ho Choi
Keyword(s):  
Molecular Recognition ◽  
Force Field ◽  
Umbrella Sampling ◽  
Two Dimensional ◽  
Reactive Force ◽  
One Dimensional ◽  
Efficient Sampling ◽  
Projection Approach ◽  
The One ◽  
Low Dimensional

The one-dimensional projection (ODP) approach is extended to two-dimensional umbrella sampling (TDUS) and is applied to three different complex systems in combination with a reactive force field (ReaxFF).

scholarly journals Two-dimensional ultrasound Doppler velocimeter for velocity field measurements of liquid metal flows

PAMM ◽  
2011 ◽  
Vol 11 (1) ◽  
pp. 649-650
Author(s):  
Sven Franke ◽  
Andreas Fischer ◽  
Lars Büttner ◽  
Jürgen Czarske ◽  
Dirk Räbiger ◽  
...  
Keyword(s):  
Velocity Field ◽  
Liquid Metal ◽  
Field Measurements ◽  
Two Dimensional ◽  
Ultrasound Doppler

MAGNETOTELLURIC RESPONSE OF LATERALLY INHOMOGENEOUS AND ANISOTROPIC MEDIA

Geophysics ◽  
1975 ◽  
Vol 40 (6) ◽  
pp. 1035-1045 ◽  
Author(s):  
I. K. Reddy ◽  
D. Rankin
Keyword(s):  
Field Measurements ◽  
Complex Model ◽  
Dimensional Structure ◽  
Impedance Tensor ◽  
Two Dimensional ◽  
Galerkin Finite Element Method ◽  
Galerkin Finite Element ◽  
The Earth ◽  
Lateral Inhomogeneity ◽  
Anisotropic Conducting

The lack of agreement between magnetotelluric field measurements and the calculations based on essentially two‐dimensional models with either anisotropy or lateral inhomogeneity necessitates a more complex model of the earth than has been previously considered. The Galerkin finite‐element method is applied to a two‐dimensional structure with a tensor conductivity. The importance of considering conductivity as a tensor is illustrated by a model consisting of an anisotropic, conducting dike embedded in an anisotropic half‐space. This model can be distinguished from an isotropic model by the nonvanishing diagonal elements of the impedance tensor, the ellipticity indices, and the skew.

Two-Dimensional Carrier Profiling on Lightly Doped n-Type 4H-SiC Epitaxially Grown Layers

2015 ◽  
Vol 821-823 ◽  
pp. 269-272 ◽  
Author(s):  
H.R. Rossmann ◽  
Urs Gysin ◽  
Alexander Bubendorf ◽  
Thilo Glatzel ◽  
Sergey A. Reshanov ◽  
...  
Keyword(s):  
Electrostatic Force ◽  
Resolution Enhancement ◽  
Wide Band ◽  
Two Dimensional ◽  
Kelvin Probe ◽  
Wide Band Gap ◽  
Band Bending ◽  
Laser Illumination ◽  
Force Microscopy ◽  
Layer Structures

Electronically active dopant profiles of epitaxially grownn-type 4H-SiC calibration layer structures with concentrations ranging from 3.1015cm-3to 1·1019cm-3have been investigated by non-contact Scanning Probe Microscopy (SPM) methods. We have shown that Kelvin Probe Force Microscopy (KPFM) and Electrostatic Force Microscopy (EFM) are capable of resolving two-dimensional carrier maps in the low doping concentration regime with nanoscale spatial resolution. Furthermore, different information depths of this wide band gap semiconductor material could be assessed due to the inherent properties of each profiling method. We additionally observed a resolution enhancement under laser illumination which we explain by reduced band-bending conditions. To gauge our SPM signals, we utilized epitaxially grown layers which were calibrated, in terms of dopant concentration, byC-Vmeasurements.

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