Structural longitudinal media

The first area covers low volumetric flow rates, and entrance pressures below Pcr. This sector of two-phase flow in the molding machine is characterized by a complex non-linear dependence of reduced pressure on reduced volumetric flow rate. The structure of foam plastics obtained in this way was called shell structure by the authors in [20, 21] — the extrudate contains huge shell bubbles which are comparable to its section. As CBA concentration increases, or medium volumetric flow rate is increased at low CBA concentration, small bubbles materialize in the melt around the shell bubbles, and the structure becomes shell-bubble . Increase of the volumetric flow rate and the concentration of flowing agent neutralizes the difference in bubble size their lateral dimensions become smaller than their longitudinal ones. 

As shown in Fig. 4.19, in anisotropic medium, a surface acoustic wave represents a combined longitudinal (4.19a) and shear (4.19b) motion of the lattice in the y-(0)-z plane this is the saggital plane. In anisotropic media, in certain multilayer structures and at some interfaces, the surface wave velocity exceeds the velocity of the shear wave and the energy continuously leaks from the surface to the bulk of the material. In such cases, we talk about pseudo- or leaky waves. Various energy-loss... 

Structure of a longitudinal thin film recording medium consists of a substrate, typically a borosilicate glass or an Al-Mg alloy about 1-2 mm in thickness, coated with an amorphous non-magnetic layer of NiP that is 5 10 m in thickness, a Cr underlayer approximately 100-150 nm in thickness, a CoGrTaPt magnetic layer approximately 20-30 nm in thickness and a carbon overcoat approximately 10-20 nm thick. Such a structure is depicted schematically in Figure 1.22 which represents a typical cross-sectional view of the layered structure of a hard disk medium. 

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