There are non-visible ones too.
This fact leads to the radiation emitted by, for example, a light-emitting diode (LED) made of c-Si which corresponds to the infrared emission and then it is non-visible by the human eye.
Four cameras are the minimum number to guarantee efficient results and robustness against different positions of the parcel, while with 3 cameras there could often be a non visible side and the parcel would need a careful positioning.
The spectral analysis demonstrated that the samples of non-hydrolyzed cellulose were non-transparent in the visible spectral range (Fig. 1a).
A change in natural frequency is observed, showing that there is some non-visible material degradation in the specimen before cracking.
Although the light wavelengths visible to the human eye are blocked by these objects, it is the non-visible light that causes damage to the eye; the ultraviolet and infrared wavelengths still get through, and cause just as much damage as the visible light.
Being female, non-visible minority, having given birth in the past 5 years, being moderately active or inactive, and having injury, diabetes, and chronic bronchitis were positively associated with hospital admission, while they had no association with hospital stay.
The overall diagnostic yield of 17% in non visible lesions is lower than in some studies [ 3, 5- 15], but higher than the yield reported in a Scottish multi-centre study (9%) [ 30].
In eukaryotic cells, translationally repressed mRNAs may be recruited into distinct intracellular foci termed as RNA granules, which are microscopically visible non-membrane-bound organelles composed of messenger ribonucleoproteins (mRNPs) (Anderson and Kedersha, 2009).
Since the stiffness is not affected by horizontal cracks the decreasing Young's modulus is assumed to be related to non-visible damage like material degradation, leading also to an increasing nonlinear effect of the wave propagation.
These lesions were not detected at surgery, as they were either the result of subclinical, degenerative changes or were located in non-visible areas of the meniscus; both instances have been previously reported [ 5, 25].
