scholarly journals The influence of texture density gradients on judgments of length

1970 ◽  
Vol 20 (6) ◽  
pp. 333-334 ◽  
Author(s):  
Colin V. Newman
Keyword(s):  
Density Gradients ◽  
Texture Density

The Influence of Visual Texture Density Gradients on Relative Distance Judgements

1971 ◽  
Vol 23 (2) ◽  
pp. 225-233 ◽  
Author(s):  
Colin V. Newman
Keyword(s):  
Space Perception ◽  
Relative Distance ◽  
Line Of Sight ◽  
Density Gradients ◽  
Visual Texture ◽  
Texture Density

A hypothesis derived from J. J. Gibson's psychophysical theory of space perception was tested. Subjects made monocular relative distance judgements by moving a marker to the apparent physical mid-point between two other fixed markers which were placed on a surface along the subjects' line of sight. Judgements were significantly influenced by the texture density gradients of stimulation derived from the surface over which they were made.

Variations in Size Judgements as a Function of Surface Texture

1973 ◽  
Vol 25 (2) ◽  
pp. 260-264 ◽  
Author(s):  
Colin V. Newman
Keyword(s):  
Density Gradient ◽  
Significant Influence ◽  
Surface Texture ◽  
Relative Distance ◽  
Density Gradients ◽  
Textured Surfaces ◽  
Independent Variables ◽  
Negative Results ◽  
Texture Density

Adult subjects made monocular size judgements in two experiments in which the independent variables of surface texture and restrictions on viewing conditions were manipulated. Texture density gradients of stimulation had a significant influence of size judgements only under the less reduced conditions of observation when subjects could see other textured surfaces beyond the surfaces over which judgements were made. Identical manipulations of surface texture had earlier been found to have a highly significant influence on relative distance judgements (Newman, 1971). The principally negative results were thus taken to imply that subjects extract different information from the texture density gradient when judging size from that extracted when judging relative distance.

Depth perception: cuttlefish (Sepia officinalis) respond to visual texture density gradients

2014 ◽  
Vol 17 (6) ◽  
pp. 1393-1400 ◽  
Author(s):  
Noam Josef ◽  
Ofri Mann ◽  
António V. Sykes ◽  
Graziano Fiorito ◽  
João Reis ◽  
...  
Keyword(s):  
Depth Perception ◽  
Sepia Officinalis ◽  
Density Gradients ◽  
Visual Texture ◽  
Texture Density

SELECTIVE ISOLATION OF HUMAN X-BEARING SPERM BY DIFFERENTIAL VELOCITY SEDIMENTATION IN PERCOLL DENSITY GRADIENTS

1984 ◽  
Vol 5 (2) ◽  
pp. 187-194 ◽  
Author(s):  
SATORU KANEKO ◽  
SHIGERU OSHIO ◽  
TOSHIFUMI KOBAYASHI ◽  
HIDEO MOHRI ◽  
RIHACHI IIZUKA
Keyword(s):  
Velocity Sedimentation ◽  
Density Gradients ◽  
Selective Isolation

Experimental study on the effect of surface texture on tribological properties of nanodiamond films under water lubrication

2021 ◽  
pp. 135065012110334
Author(s):  
Ying Yan ◽  
Xuelin Lei ◽  
Yun He
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Tribological Properties ◽  
Surface Texture ◽  
Diamond Film ◽  
Diamond Films ◽  
Nanocrystalline Diamond ◽  
Water Contact ◽  
Texture Density ◽  
Short Run

The effect of nanoscale surface texture on the frictional and wear performances of nanocrystalline diamond films under water-lubricating conditions were comparatively investigated using a reciprocating ball-on-flat tribometer. Although the untreated nanocrystalline diamond film shows a stable frictional state with an average friction coefficient of 0.26, the subsequent textured films show a beneficial effect on rapidly reducing the friction coefficient, which decreased to a stable value of 0.1. Furthermore, compared with the nanocrystalline diamond coating, the textured films showed a large decreasing rate of the corresponding ball wear rate from 4.16 × 10−3 to 1.15 × 10−3 mm3/N/m. This is due to the fact that the hydrodynamic fluid film composed of water and debris can provide a good lubrication environment, so the entire friction process has reached the state of fluid lubrication. Meanwhile, the surface texture can greatly improve the hydrophilicity of the diamond films, and as the texture density increases, the water contact angle decreases from 94.75° of the nanocrystalline diamond film to 78.5° of the textured films. The proper textured diamond film (NCD90) exhibits superior tribological properties among all tested diamond films, such as short run-in period, low coefficient of friction, and wear rate.

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