By Kenneth P. Katz
Greater than the other weapon procedure, the mythical Boeing B-52 Stratofortress is the embodiment of yank army strength within the well known mind's eye. The B-52 was once workhorse of the Strategic Air Command in its nuclear deterrent position, crucial venture throughout the chilly conflict. maybe the main awesome point of the B-52 has been its toughness. First flown in 1952 and coming into operational carrier with the USA Air strength in 1955; Boeing introduced the final new B-52 in 1962. greater than four a long time later, the B-52 is still in entrance line provider, such a lot lately serving in strive against over Afghanistan and Iraq. much more amazingly, present plans are for the B-52 to stay in carrier till 2040! 119 pictures, 113 of that are in colour, plus line drawings and 5 colour profiles. 60 pages.
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This mode describes a velocity modulation in the direction of motion. 33), the sound waves have frequency w = -Janok sin 7/J and speed s = w/k = Yanosin7/J. We see that this speed depends on the propagation direction, decreasing for the sound waves that propagate closer to the x-axis. The speed s vanishes and the respective modes become purely dissipative at 7/J = o. This behavior is different from the properties of sound waves in classical isotropic fluids, where the Galilean invariance prohibits any dependence of the sound on the angle between the wavevector and the flow direction.
Suppose that each particle represents a solid disk of radius Ro. The surfactant is continuously produced at rate J per unit time inside the particle and released into the liquid through a small hole located at the center of the disk bottom. This surfactant diffuses through the liquid with the diffusion constant D and modifies its surface tension. The capillary coefficient T, which gives the magnitude of the capillary force acting per unit length of the solid-liquid contact line, depends as T = To - J-LC on the local surfactant concentration c.
In reality, the pheromone concentration in the air close to the ground fluctuates because of the turbulence in the atmosphere. This can be taken phenomenologically into account by replacing the calculated concentration field c(r, t) with c(r, t)(l+c~(r, t)), where ~(r, t) is white noise of unit intensity and c is a parameter that specifies the mean amplitude of fluctuations. The ants sense the pheromone concentration in a thin air layer close to the surface (z -+ 0). e. tlC = l(k· V'c), where l is the distance between the left and right antennae and k is the unit vector with the components kx = sin () and ky = - cos ().
B-52G H Stratofortress in Action No 207 Color Series by Kenneth P. Katz