منابع مشابه
Greens Functions for 3-D Seismic Migration
The space-time Greens functions for 3-D poststack and 3-D prestack migration in a homogeneous medium are derived under the fareld approximation. These Greens functions can be used to practically compute synthetic migrated images. Examples are given for the recording footprint noise associated with a point scatterer and a meandering river channel. The Greens functions also provide fundamental in...
متن کاملSod for Greens and Tees Penncross Bent
Turfgrass évapotranspiration. R. Tovey, J. S. Spencer and D. C. • Muckel. 1969. Agronomy Journal. 61:863-867. (from the University of Nevada, Reno, Ne v. 89507). The lysimeter technique was utilized to measure the rate of évapotranspi ra t ion from two types of turf grown on two different soil textures. The two types of turfgrass were (a) a cool season turf composed primarily of Kentucky bluegr...
متن کاملGreens Functions for the Wave Equation
I gather together known results on fundamental solutions to the wave equation in free space, and Greens functions in tori, boxes, and other domains. From this the corresponding fundamental solutions for the Helmholtz equation are derived, and, for the 2D case the semiclassical approximation interpreted back in the time-domain. Utility: scarring via time-dependent propagation in cavities; Math 4...
متن کاملFINE GREENS and FAIRWAYS
mowing. It is run along the ground on one large wheel which is f ree of the motor operat ing the cutter bar. I t can be tilted to cut up or down slopes and can be pivoted sharply in any direction. It has been found part icularly valuable for cutting around trees, boulders, t raps, creek-bottoms, and other golf course obstructions which formerly required hand cutt ing. The motor scythe, powered ...
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ژورنال
عنوان ژورنال: Nature
سال: 1989
ISSN: 0028-0836,1476-4687
DOI: 10.1038/340089c0