The nematicides and pesticides are not literally different. What is the difference between the two? Insecticides are used to kill insects. As the name suggests, nematicides are used to kill nematodes. This can be understood as insecticides including nematicides. Pesticide Xiaobian focuses on the nematicides: A class of pesticides that kill nematodes against harmful nematodes. The nematodes belong to the linear phylum of the genus Nematodes, which are small in shape and can be observed under the microscope. There are about 3,000 species of nematodes harmful to plants, most of which live in the soil, and some are parasitic in plants. Nematodes spread through soil or seeds, can destroy the roots of plants, or invade the organs of the aboveground parts, affect the growth and development of crops, and indirectly spread the diseases caused by other microorganisms, causing great economic losses. The use of pesticides to control nematodes is an effective method commonly used in modern agriculture. It is generally used for soil treatment or seed treatment. The nematicides are volatile and non-volatile. The former acts as a fumigation and the latter acts as a contact.
Meniscus Lenses: The Positive Meniscus can increase the NA of the system while only adding slightly to the total spherical aberrations. The Negative Meniscus Lens is used to increase the focal length of another lens while maintaining the angular resolution of the optical assembly. This lens shape is best used when one conjugate is relatively far from the lens. The meniscus lens plays a divergent role in the optical path, and is commonly used in photographic system, objective lens system and laser measuring system.
We supply kinds of Plano-Convex Spherical Lens,Plano-Concave Spherical Lens,bi-convex Spherical Lens,bi-concave spherical lens,meniscus spherical lens,special spherical lens,achromatic spherical lens,ball lens,sphere lens etc.
Specification of our optical meniscus spherical lens as follow:
Meniscus Spherical Lens,Meniscus Spherical Lenses,Optical Glass Meniscus Lens,Glass Meniscus Lens China Star Optics Technology Co.,Ltd. , https://www.opticsrealpoo.com
*Material BK7,CaF2 crystal,MgF2,Ge,BaF2 lens,ZnSe or other optical materials
*Dimension Tolerance +0.0 - -0.1mm
*Center Thickness +/-0.1mm
*Focal Length Tolerance+/-1%
*Surface Quality:60/40
*Surface Figure:lambda/2 at 633nm on plano side
*Clear Aperture >90%
*Chamfer 0.25mm at 45 degree typical
*Coating Optional