Speckles

Near-field speckles Objective speckles are usually obtained in the far field (also called Fraunhofer region, that is the zone where Fraunhofer diffraction happens).

Speckles are dynamic structures, and both their protein and RNA-protein components can cycle continuously between speckles and other nuclear locations, including active transcription sites.

This kind of speckles are called near field speckles.

Duane Fuller and Mark Maxwell were the winning combination in the Team Roping event sponsored by Kamarah Speckles and TAMA.

I used to think that paprika and parsley were just for show — nothing more than powdery red dashes on creamy deviled eggs, and verdant speckles breaking up the brown monotony of beef stew.

The oozing reluctance has ceased and is replaced by determination through a quickened pace and likely dirt speckles that come from negotiating a dusty terrain to find a six-inch or 12-inch orange and white triangle.

The screen, on the other hand, didn't look any worse for wear, with a few speckles around the very edge that scraped off when I ran my fingers over it.

In the case of near field speckles, the statistical properties depend on the light scattering distribution of a given sample.

It is called "subjective" because the detailed structure of the speckle pattern depends on the viewing system parameters; for instance, if the size of the lens aperture changes, the size of the speckles change.

Objective speckles A photograph of an objective speckle pattern.

Speckles can be observed also close to the scattering object, in the near field (also called Fresnel region, that is, the region where Fresnel diffraction happens).

Subjective speckles When an image is formed of a rough surface which is illuminated by a coherent light (e.g. a laser beam), a speckle pattern is observed in the image plane; this is called a “subjective speckle pattern” – see image above.

The "size" of the speckles is a function of the wavelength of the light, the size of the laser beam which illuminates the first surface, and the distance between this surface and the surface where the speckle pattern is formed.

The speckles will be seen to increase significantly in size.

Thus, the ‘size’ of the speckles in the image is of this order.

Touch Caudal: The upper and lower jaws are covered with sensory pits, visible as small, black speckles on the skin, the crocodilian version of the lateral line organs seen in fish and many amphibians, though arising from a completely different origin.