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By Xu Y.
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Cho (University of Canberra) explores either how the legislation impacts using geographic details and the way geographic details has formed the legislation and coverage in numerous international locations. He identifies the standards influencing public use and pricing rules, describes using trade criteria to percentage and commercialize geographic info, and descriptions a global framework for the advance of entry guidelines.
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62XE 6, ) for X L << 5, (and more complex for mulas when h L 4,). Table 2-2 gives a comparison between such theor elical values and the experimental data (extrapolated to 0 "K), There is satisfactory qualitative agreernenl, but it would be rather difficult to determine 4, from X if one had no other information. The detailed form of relation (2-16)cannat be considered establish& by this type of measurement. We a r e now begjmning to obtain finer verifications, mainly by measurement of magnetic field transmission through a thin film.
We want to compare this expression with (2-35). F o r that purpose we transform (2-35) as fotliows: The last integral i s t o be taken over a distant surface surrounding the entire system. It represew the radiated energy and f o r a slow, reversible transformation it i s negligible, Then comparing (2-40) and 62-39] we see that 62-38) i s satisfied . Conclusion, All currents contribute to curl B (Eq. 2-34), but anfy contributes to curl H (Eq. 2-38). We might be tempted to say that 'ext N is the field that would exist in the absence of the specimen (the same jext being kept on the coils).
Value (2-15). This gives The choice of the simple form (2-16) for the relation between current and vector potential was a guess of Pippard. Later, after the development of the rnicrascopic theory, it was vergied that the exact rektion between field and current is very close to (2-1 6) if ones takes The exact relation between f and A will be discussed in Chapter 4 , It i s mueh mare complicated algebraically than (2-16) and the approximate Pippard form remains very useful, We now apply it to a study of penetration depths, The Penetrotion Depth Eq.