Computer analysis of polarized spacing patterns with special reference to the larvae of the black fly, Simulium vittatum

1987 ◽  
Vol 65 (3) ◽  
pp. 602-604 ◽  
Author(s):  
M. Eymann ◽  
J. M. Schmidt ◽  
W. G. Friend
Keyword(s):  
Computer Analysis ◽  
Statistical Significance ◽  
Present Form ◽  
Nearest Neighbour ◽  
Two Dimensional ◽  
Neighbour Distance ◽  
Analysis Techniques ◽  
Simulium Vittatum ◽  
Spacing Pattern ◽  
Average Individual

A computer analysis of spacing patterns which makes fewer assumptions than either nearest-neighbour distance or plot frequency analysis techniques is described. This analysis determines if the spacing pattern is polarized in any direction, and can compensate for the possible effect of the size and shape of the organism on the spacing pattern. The output of the analysis is a two-dimensional frequency distribution which represents the likelihood of finding a neighbour near an average individual. This output can be represented by a two-dimensional map. The method requires a sample size greater than 50, and in its present form cannot assign statistical significance to the resulting probability distribution.

scholarly journals Ordering in Two-Dimensional Lennard-Jones Clusters

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Barnana Pal
Keyword(s):  
Phase Diagram ◽  
Particle Concentration ◽  
Cluster Formation ◽  
Mean Square Displacement ◽  
Nearest Neighbour ◽  
Mean Square ◽  
Two Dimensional ◽  
Neighbour Distance ◽  
Lennard Jones ◽  
The Monte Carlo Method

Cluster formation in a two-dimensional Lennard-Jones system under different conditions of temperature () and particle concentration () has been studied using the Monte-Carlo method with the introduction of real thermal motion of the constituent particles through a modification of the conventional Metropolis algorithm. The - phase diagram determined from the study of the root mean square displacement of the particles shows features characteristics of the - diagram for phase equilibrium in real systems. The solid-like to liquid-like transition takes place when the average nearest neighbour distance increases by ~1% of the equilibrium value in the low-temperature solid-like configuration. The Lindemann parameter () is found to decrease with the increase of to reach a steady value of for .

ELASTIC PROPERTIES OF STRAINED FCC AND HCP IRON

1993 ◽  
Vol 07 (01n03) ◽  
pp. 207-211
Author(s):  
T. KRAFT ◽  
M. METHFESSEL ◽  
M. VAN SCHILFGAARDE ◽  
M. SCHEFFLER
Keyword(s):  
Energy Cost ◽  
Interplanar Distance ◽  
Orbital Method ◽  
Full Potential ◽  
Local Spin Density Approximation ◽  
Nearest Neighbour ◽  
Density Approximation ◽  
Neighbour Distance ◽  
Large Lattice ◽  
Fcc Phase

Using the full-potential linear muffin-tin orbital method within the local spin-density approximation we analyse the influence of the nearest neighbour distance on fcc(111) or hcp(0001) iron layers. The LDA-LSDA error in describing ferromagnetic phases is determined to be at least 15 mRy/atom. As a consequence of this error, our calculations favour paramagnetic ground states. In this sense, the reported results have some model character. However, our analysis of the elastic energy cost under distortions should hold for transition metals in general. Allowing relaxations of the interplanar distance the fcc phase can become energetically favourable over the hcp phase at large lattice mismatches. The main reason for this behaviour is the enhanced stiffness of the hcp interplanar bonds due to the shortening of the axial c/a ratio.

Specific heat of ordered and isotopically disordered lattices

1978 ◽  
Vol 56 (10) ◽  
pp. 1390-1394
Author(s):  
K. P. Srivastava
Keyword(s):  
Specific Heat ◽  
Low Temperatures ◽  
Numerical Study ◽  
Three Dimensional ◽  
Constant Volume ◽  
Nearest Neighbour ◽  
Two Dimensional ◽  
Appreciable Difference ◽  
Substantial Change ◽  
Neighbour Interaction

An extensive numerical study on specific heat at constant volume (Cv) for ordered and isotopically disordered lattices has been made. Cv at various temperatures for ordered and disordered linear and two-dimensional lattices have been compared and no appreciable difference in Cv between these two structures has been observed. Effect of concentration of light atoms on Cv for three-dimensional isotopically disordered lattices has also been shown.In spite of taking next-nearest-neighbour interaction into account, no substantial change in Cv between the ordered and isotopically disordered linear lattices has been found. It is shown that the low lying modes contribute substantially at low temperatures.

scholarly journals General up to next-nearest-neighbour elasticity of triangular lattices in three dimensions

2006 ◽  
Vol 462 (2073) ◽  
pp. 2695-2713 ◽  
Author(s):  
Cyril Dubus ◽  
Ken Sekimoto ◽  
Jean-Baptiste Fournier
Keyword(s):  
Blood Cell ◽  
Red Blood Cell ◽  
Triangular Lattice ◽  
Soft Matter ◽  
Rotational Symmetry ◽  
Three Dimensions ◽  
Nearest Neighbour ◽  
Two Dimensional ◽  
Biological Physics ◽  
Crystalline System

We establish the most general form of the discrete elasticity of a two-dimensional triangular lattice embedded in three dimensions, taking into account up to next-nearest-neighbour interactions. Besides crystalline system, this is relevant to biological physics (e.g. red blood cell cytoskeleton) and soft matter (e.g. percolating gels, etc.). In order to correctly impose the rotational invariance of the bulk terms, it turns out to be necessary to take into account explicitly the elasticity associated with the vertices located at the edges of the lattice. We find that some terms that were suspected in the literature to violate rotational symmetry are, in fact, admissible.

Two-dimensional computer analysis of GaAs MESFETs

1993 ◽  
Vol 36 (4) ◽  
pp. 547-552 ◽  
Author(s):  
Xiaoqi Dong ◽  
M. El Nokali
Keyword(s):  
Computer Analysis ◽  
Two Dimensional

Quantitative analysis and pattern recognition of two-dimensional electrophoresis gels.

1984 ◽  
Vol 30 (12) ◽  
pp. 1919-1924 ◽  
Author(s):  
G Ridder ◽  
E VonBargen ◽  
D Burgard ◽  
H Pickrum ◽  
E Williams
Keyword(s):  
Pattern Recognition ◽  
Image Analysis ◽  
Quantitative Analysis ◽  
Data Reduction ◽  
Two Dimensional ◽  
Two Dimensional Electrophoresis ◽  
Analysis Techniques ◽  
Bacterial Cultures ◽  
Dimensional Electrophoresis ◽  
Image Analysis Techniques

Abstract We describe a system, both hardware and software, that provides quantitative analysis and data reduction of two-dimensional electrophoresis gels. Image-analysis techniques are used to determine spot intensities and to match spot patterns among many gels. A pattern-recognition program is used to extract the useful information contained in the spot lists. The application of this technology to a study of supernates from bacterial cultures is described.

scholarly journals Irradiation symmetry of heavy ion driven inertial confinement fusion (ICF) targets

1983 ◽  
Vol 1 (4) ◽  
pp. 335-345 ◽  
Author(s):  
G. Buchwald ◽  
G. Graebner ◽  
J. Theis ◽  
J. A. Maruhn ◽  
H. Stöcker ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Heavy Ion ◽  
Present Form ◽  
Inertial Confinement ◽  
Two Dimensional ◽  
Beam Angle ◽  
Beam Geometry ◽  
Confinement Fusion ◽  
Hydrodynamic Code

The symmetry of heavy ion driven inertial confinement fusion targets is investigated with a two-dimensional Eulerian hydrodynamic code. The importance of the beam geometry is studied. The HIBALL design in its present form seems to inhibit a spherical implosion of the target. It is shown that the beam angle in the HIBALL geometry should be about 35 degrees.

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