By L. M. Milne-Thomson
An exceptional creation to the research of inviscid airflow utilizing capability idea, this ebook is an established college textual content and reference and a classic in its box. This variation is a whole reprint of the revised 1966 variation, which brings the topic modern. comprises a wealth of difficulties, illustrations, and cross-references.
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Extra resources for Theoretical Aerodynamics (Dover Books on Aeronautical Engineering)
Example text
W. PARKINSON, M. J. KELLY, AND I. O. SALYER whether the decreasing apparent conductivity following irradiation is actual charge transport by mobile charge carriers or merely reorientation of radiation-generated dipoles similar to the dielectric polarization prior to exposure to ionizing radiation. Furthermore, if post-irradiation conductivity is true charge transport, is the nature of the mobile carriers ionic or electronic? Both of these questions can be answered by the behavior of the apparent conducivity upon removing (short circuiting), and reversing the applied potential, and by repeated measurements.
The measured capacitance of the specimens, C, was used with the apparent resistance, derived from the amplifier output, Rx, 32 W. W. PARKINSON, M. J. KELLY, AND I. O. SALYER to calculate the conductance-capacitance ratio, Elc, and Elc = llRxC = crlee o • Then the apparent conductivity of the specimen, cr, can be calculated by multiplying Elc by the product of the dielectric constant, e, and the permittivity of space, eo. 1 x 10-13 f/cm. In the measurement of specimens both before and after irradiation, the apparent conductance decreases with time owing to dielectric polarization.
GEN. CONDUCTION ~ AT 92,000 ~, ~ " , -7 10 TIME (sec) Fig. 3. Typical Behavior of Conductivities of High-Purity Polystyrene Upon Short Circuiting or Reversing Applied Potential. 38 W. W. PARKINSON, M. J. KELLY, AND I. O. SALYER lower radiation--generated conduction made it difficult to discern the decayed radiation-induced conductivity superimposed upon the initial dielectric charging. If the post-irradiation conductivity were dielectric charging of radiation-generated polar species, the apparent conduction upon reversal of applied potential at 90,000 sec would be approximately twice the initial value of post-irradiation conduction, unless a decrease or decay of dipoles is assumed.
Theoretical Aerodynamics (Dover Books on Aeronautical Engineering) by L. M. Milne-Thomson
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