Similarity solutions of Reaction-Diffusion equation with space- and time-dependent diffusion and reaction terms

We consider solvability of the generalized reaction-diffusion equation with both space- and time-dependent diffusion and reaction terms by means of the similarity method. By introducing the similarity variable, the reaction-diffusion equation is reduced to an ordinary differential equation. Matching the resulting ordinary differential equation with known exactly solvable equations, one can obtain corresponding exactly solvable reaction-diffusion systems. Several representative examples of exactly solvable reaction-diffusion equations are presented.Comment: 11 pages, 4 figure

Xantusia henshawi

Number of Pages: 2Integrative BiologyGeological Science

Apparatus for production of ultrapure amorphous metals utilizing acoustic cooling

Amorphous metals are produced by forming a molten unit of metal and deploying the unit into a bidirectional acoustical levitating field or by dropping the unit through a spheroidizing zone, a slow quenching zone, and a fast quenching zone in which the sphere is rapidly cooled by a bidirectional jet stream created in the standing acoustic wave field produced between a half cylindrical acoustic driver and a focal reflector or a curved driver and a reflector. The cooling rate can be further augmented first by a cryogenic liquid collar and secondly by a cryogenic liquid jacket surrounding a drop tower. The molten unit is quenched to an amorphous solid which can survive impact in a unit collector or is retrieved by a vacuum chuck

Contactless pellet fabrication

A small object is coated by holding it in the pressure well of an acoustic standing wave pattern, and then applying a mist of liquid coating material at low velocity into the pressure well. The pressure gradient within the well forces the mist particles to be pushed against the object. A lower frequency acoustic wave also can be applied to the coated object, to vibrate it so as to evenly distribute the coated material. The same lower frequency vibrations can be applied to an object in the shape of a hollow sphere, to center the inner and outer surfaces of the sphere while it remains suspended

Anolis sericeus

Number of Pages: 2Integrative BiologyGeological Science

Bacteria as Ovipositional Attractants for \u3ci\u3eCulex Pipiens\u3c/i\u3e (Diptera: Culicidae)

(excerpt) The study of factors and mechanisms involving ovipositional attractants in mosquitoes is still a relatively new area of research. Some early workers in mosquito biology suggested that gravid mosquitoes simply scattered their eggs indiscriminately on available aquatic sites; however, numerous field studies have failed to provide any real evidence for indiscriminate oviposition. The current idea is that oviposition involves not only locating an aquatic site, but the selection of an environment containing the necessary physical, chemical, and biotic factors required for larval development. It is desirable for female mosquitoes to be able to detect a breeding site that can successfully provide an environment suitable for development of their own species. According to Kramer and Mulla (1979), it is most likely that gravid females of different species use different factors in cueing in on and selecting ovipositional sites