Oxygen and irradiation of ultraviolet ray of the sun constitute the main factors causing silk yellowness.
Other forms of radiant energy familiar to us are radio waves, infrared rays, ultra - violet rays, X rays, and gamma rays.
Electric arc discharge of the tips installed in BSP source produces intense ultraviolet ray emission with a spectrum continuously extended to the range of visible light.
The ultraviolet ray lamp inside machine can realize sterilization.
wild aster having grayish leafy stems and flower heads with narrow pale lavender or violet rayes; of rocky desert slopes California to Arizona and Utah.
Through the single factor experiment determination ultraviolet ray mutagenesis's time, and under this mutagenesis time's condition, the natto bacillus carries on mutafacient processing to T-3.
Ozone provides a natural protective filter against harmful ultra-violet rays from the sun, which can cause sunburn, cataracts and skin cancer as well as damage vegetation.
It serves as a sun base to leave skin tone looking even and sharp by efficiently intercepting ultra violet rays for everyday life when it is without outdoor activities.
Conclusions The ultraviolet ray irradiation can adjust immunity function of patients with cervical spondylopathy.
Properties of preventing ultraviolet ray of polyurethane are raised after adding ultraviolet ray absorbent.
Worker had to match sunglasses, must wear long sleeve clothes, bring it out rubber glove, forbid ultraviolet ray direct irradiate skin, avoid long-term job suffer from dermatosis.
The ultraviolet ray light can sterilize the packaging material.
The surface layer protects the light film, and has the characteristics of anti ultraviolet ray, automatic cleaning and dirt removing.
"aster any of various plants of the genus aster in the composite family, having radiate flower heads with white, pink, or violet rays and a usually yellow disk. "
