Sentences with phrase «propagation material»

It is mainly tip growth that has been taken, so it looks very much as if this was done by someone illegally obtaining propagation material.»

Organic X Seeds You can use the site to search for available organic seeds, vegetative propagation material and seed potatoes.

If you have any questions on propagation material in organic farming, please contact the organic seed bureau.

Groot, S.P.C.; Jalink, H.; Hospers - Brands, M.; Köhl, J.; Veerman, A.; Wenneker, M.; van der Wolf, J.M. and van den Bulk, R.W (2006) Improvement of the quality of propagation material for organic farming system.

Not exact matches

A metabolically active sack, devoid of genetic material and the potential for propagation, is also not alive.

«In the past few years there has been a strong interest in translating this concept of matter topology from material science to light propagation,» said Alù.

«Studying the formation and evolution of jets in metals and, more generally, how materials at extreme conditions respond using X-ray phase contrast imaging is relevant to such things as meteorite impacts, the performance of explosives and detonators, understanding crack nucleation and propagation in materials, and the development of new materials with tailored properties whose applications include automotive and airplane components, lighter and more impact - resistant armor, and debris shields in space, to name a few.»

The grating, which comprises a small modulation in the optical material properties, forms a bandgap for light, which strongly effects the propagation of light, in the same way that semiconductors control the flow of electrons.

The paper is titled «Phase Mismatch - Free Nonlinear Propagation in Optical Zero - Index Materials.»

For this material, disturbances to the electron spin orientation can propagate on the edge of the magnetic crystal, even when propagation through the bulk is blocked.

In their experiments, Chen and his colleagues used microfabrication to vary the size of the aluminum dots, and measured the decay of a pulsed laser reflected from the material — an indirect measure of the heat propagation in the material.

For example, if an engineer desires a material with certain thermal properties, the mean free path distribution could serve as a blueprint to design specific «scattering centers» within the material — locations that prompt phonon collisions, in turn scattering heat propagation, leading to reduced heat carrying ability.

By scattering light, the material slows down the effective propagation speed of the light waves through the medium.

Due to the small extent of optical nonlinearity in naturally occurring materials, high light intensities and long propagation distances in nonlinear crystals are typically required to produce detectable nonlinear optical effects.

A movement based on the above principles could protect millions of acres of wilderness more stringently than could any congressional act, could insure the propagation of the Grizzly and other threatened life forms better than could an army of game wardens, and could lead to the retreat of industrial civilization from large areas of forest, mountain, desert, prairie, seashore, swamp, tundra, and woodland that are better suited to the maintenance of native diversity than to the production of raw materials for over consumptive technological human society.

Reflection incidently is a property of materials, not of light; and arises naturally from Maxwell's equations on EM waves encountering a material interface between two different media, that have different characteristic impedances, and / or velocity of wave propagation.

DOI: 10.4236 / eng.2012.412 A118 4,469 Downloads 6,420 Views Citations This article belongs to the Special Issue on Modeling of Composite Materials and Wave Propagation in Heterogeneous Materials