Nanotribology of Octadecyltrichlorosilane Monolayers and Silicon:  Self-Mated versus Unmated Interfaces and Local Packing Density Effects

Langmuir ◽  
2007 ◽  
Vol 23 (18) ◽  
pp. 9242-9252 ◽  
Author(s):  
Erin E. Flater ◽  
W. Robert Ashurst ◽  
Robert W. Carpick
Keyword(s):  
Packing Density ◽  
Density Effects ◽  
Local Packing Density

Ionic Strength, Surface Charge, and Packing Density Effects on the Properties of Peptide Self-Assembled Monolayers

Langmuir ◽  
2017 ◽  
Vol 33 (8) ◽  
pp. 2050-2058 ◽  
Author(s):  
Norman Leo ◽  
Juan Liu ◽  
Ian Archbold ◽  
Yongan Tang ◽  
Xiangqun Zeng
Keyword(s):  
Ionic Strength ◽  
Surface Charge ◽  
Packing Density ◽  
Self Assembled Monolayers ◽  
Strength Surface ◽  
Density Effects ◽  
Assembled Monolayers ◽  
Self Assembled

Random Lasing in Self-Assembled Dye-Doped Latex Nanoparticles: Packing Density Effects

2013 ◽  
Vol 23 (31) ◽  
pp. 3916-3924 ◽  
Author(s):  
Luis Cerdán ◽  
Angel Costela ◽  
Eduardo Enciso ◽  
Inmaculada García-Moreno
Keyword(s):  
Packing Density ◽  
Random Lasing ◽  
Density Effects ◽  
Self Assembled

Packing-Density Effects on the Friction ofn-Alkane Monolayers

2001 ◽  
Vol 123 (28) ◽  
pp. 6873-6881 ◽  
Author(s):  
Paul T. Mikulski ◽  
Judith A. Harrison
Keyword(s):  
Packing Density ◽  
Density Effects

scholarly journals Local Packing Density Is the Main Structural Determinant of the Rate of Protein Sequence Evolution at Site Level

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
So-Wei Yeh ◽  
Tsun-Tsao Huang ◽  
Jen-Wei Liu ◽  
Sung-Huan Yu ◽  
Chien-Hua Shih ◽  
...  
Keyword(s):  
Packing Density ◽  
Protein Sequence ◽  
Solvent Accessibility ◽  
Sequence Evolution ◽  
Relative Solvent Accessibility ◽  
Sequence Variability ◽  
Substitution Rates ◽  
Contact Number ◽  
Local Packing Density ◽  
Structural Determinant

Functional and biophysical constraints result in site-dependent patterns of protein sequence variability. It is commonly assumed that the key structural determinant of site-specific rates of evolution is the Relative Solvent Accessibility (RSA). However, a recent study found that amino acid substitution rates correlate better with two Local Packing Density (LPD) measures, the Weighted Contact Number (WCN) and the Contact Number (CN), than with RSA. This work aims at a more thorough assessment. To this end, in addition to substitution rates, we considered four other sequence variability scores, four measures of solvent accessibility (SA), and other CN measures. We compared all properties for each protein of a structurally and functionally diverse representative dataset of monomeric enzymes. We show that the best sequence variability measures take into account phylogenetic tree topology. More importantly, we show that both LPD measures (WCN and CN) correlate better than all of the SA measures, regardless of the sequence variability score used. Moreover, the independent contribution of the best LPD measure is approximately four times larger than that of the best SA measure. This study strongly supports the conclusion that a site’s packing density rather than its solvent accessibility is the main structural determinant of its rate of evolution.

Variation in the local packing density near the wall of a randomly packed bed of equal spheres

1978 ◽  
Vol 20 (2) ◽  
pp. 257-260 ◽  
Author(s):  
Keishi Gotoh ◽  
W.S. Jodrey ◽  
E.M. Tory
Keyword(s):  
Packing Density ◽  
Packed Bed ◽  
Local Packing Density

scholarly journals Experiment on compaction of air-dried soil under drop shocks

PLoS ONE ◽  
2021 ◽  
Vol 16 (4) ◽  
pp. e0250076
Author(s):  
Jianbo Wang ◽  
Tiansheng Hong ◽  
Zhen Li ◽  
Xiuyun Xue ◽  
Shilei Lyu
Keyword(s):  
Shock Intensity ◽  
Packing Density ◽  
Soil Compaction ◽  
Local Density ◽  
Drop Height ◽  
Nursery Culture ◽  
Straight Line ◽  
Dimensional Distribution ◽  
Line Slope ◽  
Local Packing Density

For the requirement in container nursery culture that growing media should be achieved the appropriate degree compaction, this paper presents an experiment on the compaction dynamics of air-dried soil under repetitive drop shocks, as a preliminary step toward the mechanization of this compaction method. The drop height used to adjust the shock intensity included 2 mm, 4 mm, 5 mm and 6 mm. And the overall packing density of soil in a vertically stratified cylinder vessel and the local packing density in each layer were taken as indicators of soil compaction states. The stretched exponential function derived from KWW law than the empirical inverse-logarithmic function has been found to be more suitable for expressing the temporal evolution of soil compaction, according to the results of curve-fitting to test values of the overall and local density. It is inherent in this experimental configuration that the drop shock intensity even at a constant drop height varies with drop times, owing to the interaction between the soil packing itself and drop shocks caused by the combination of the packing and the container. But the function t/τf(t,H) is manifested as a straight line on the drop times t with the line slope related to the drop height H, so the soil compaction dynamics caused by its drop shocks and that under the condition with actively controlled intensity actually share the common relaxation law. In addition, the soil’s one-dimensional distribution of local packing density showed a slight positive gradient as similar as monodisperse particles did.

Inhomogeneity of local packing density and atomic bonding of Ni67Zr33 amorphous alloy

2018 ◽  
Vol 732 ◽  
pp. 585-592 ◽  
Author(s):  
K. Itoh ◽  
J. Saida ◽  
T. Otomo
Keyword(s):  
Amorphous Alloy ◽  
Packing Density ◽  
Local Packing Density
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