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9.5.1 Introduction (Buckley, 1997) The purpose of lubrication is to separate surfaces in relative motion, by a material that has a low shear resistance to friction and wear and also to minimize damage or prevent major damage of the surfaces. The material can be of any variety, such as adsorbed gases, chemical reaction products, lms, liquids, or solid lubricants. The lubricating lm (Stribeck, 1902) is classi ed rst by the well-known Stribeck-Hersey curve (1902) in which the coef cient of friction is plotted as a function of the ZN/P parameter where Z is the viscosity of the medium, N is the velocity, P is the load, and h is the lm thickness (Fig. 9.10). The uid lm regimes are: hydrodynamic, elastohydrodynamic, and mixed-lubrication regimes as well as boundary lubrication. Hydrodynamic lubrication or uid- lm lubrication occurs at high speeds and low loads or high viscosities in which the surfaces are completely separated by a thick lm h > 10-5 in. This rheology of the lubricant determines the friction in this hydrodynamic regime. Elastohydrodynamic lubrication (EHD) implies a uid- lm regime where the loads of the surfaces and the pressure-viscosity of the lubricant occur at h ~ 10-6 to 10-4 in. In mixed-lubrication regime, which is thinner, surface asperity interactions occur with increased friction and uid lm effects, with h ~ 10-7 to 10-6 in. Last, with low values of the ZN/P parameter h ~ 10-7 in is the realm of boundary lubrication. The most important aspect of the boundary lubrication regime is the forma-

Analysis with PerformancePoint Server . Analytic Charts . . . . . . . . . Analytic Grids . . . . . . . . . . Analysis with ProClarity . . . . . . . . . The ProClarity Professional Client The ProClarity Standard Client . . Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138 140 159 168 169 207 214

Notice that when the Gen constructor is called, the type argument int is also specified. This is necessary because the type of the variable (in this case iOb) to which the reference is being assigned is of type Gen<int>. Thus, the reference returned by new must also be of type Gen<int>. If it isn t, a compile-time error will result. For example, the following assignment will cause a compile-time error:

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Figure 3-10 A candid photo always works better than the old throw- em-up-against-the-wall technique.

signal should again be measured at the receiver output for comparison at the input. This type of measurement can be facilitated using one of the present spectrum analyzers that can drive a printer directly. Comparing a printout of the frequency spectrum of the carriers at each point is a quick way to establish network signal transparency.

The prototypes for the stricmp( ) function and strcmpi( ) macro are found in <string.h>. Neither of these are defined by the ANSI/ISO C/C++ standard. The stricmp( ) function lexicographically compares two null-terminated strings while ignoring case; strcmpi( ) is a macro that translates to a stricmp( ) call. Both functions return an integer based on the outcome, as shown here:

// Display a triangle's style. public void ShowStyle() { Console.WriteLine("Triangle is " + Style); } } class Shapes7 { static void Main() { Triangle t1 = new Triangle("right", 8.0, 12.0); // Make a copy of t1. Triangle t2 = new Triangle(t1); Console.WriteLine("Info for t1: "); t1.ShowStyle(); t1.ShowDim(); Console.WriteLine("Area is " + t1.Area()); Console.WriteLine(); Console.WriteLine("Info for t2: "); t2.ShowStyle(); t2.ShowDim(); Console.WriteLine("Area is " + t2.Area()); } }