The significant expenditures for organic synthesis of high‐energy materials necessitate an a priori evaluation of prospects for physical‐chemical parameters. The most important of these parameters is the heat of formation characterizing this or the other compound suggested for synthesis. This study describes and analyzes the most well‐known and widely used schemes and methods for evaluating and predicting the energy capacity of high‐energetic materials. The accuracy of calculations is evaluated for different schemes; the limits of their applicability are determined.

The ratio between the numbers of structural formulas of C,H,N,O-containing energetic compounds belonging to the classes of fuels (low values of the oxygen coefficient A), explosives (medium A), and oxidants (high A values) was studied by a computer generation procedure. The number of the theoretically possible structural formulas was found to decrease rapidly on going from fuels to explosives and then to oxidants; this observation agrees with the data on the numbers of various energetic compounds currently used and proposed. The strategy of the search for new compounds with the specified properties is described in brief, and its applicability to the search for explosives and oxidants with a small (up to 12) number of atoms in a molecule is evaluated.

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Microwave radiometers operating at wavelengths 0.3, 0.8, 1.35 and 2.25 cm were used during CLEOPATRA [ I ] at ground to estimate rain rates. A model of the microwave emission of the rain layer taking into account polarization effects used for rain parameters retrieval is briefly described. Intercomparisons with simultaneous measurements with the DLR polarimetric Doppler radar POLDIRAD, distrometery and futthcr ground hased inwumentation was used for validation of the algorithm for rain rate estimations by microwave radiometry.

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