Many chemical and pharmaceutical compositions are known to produce antinociceptive effects that are helpful in relieving pain and inflammation. The flow channel has a variable flow passage section. The method determines the complex weights on the antenna elements and the magnitude of the vertical and horizontal components of the calibration signal in the presence of multi-path signals as well as standard noise. However, until now, a durable system that effectively insulates concrete while in transport has not been available. Metal powders such as niobium powders having reduced amount of contaminants andor having DC leakage or capacitance capabilities are also described. Individual breaths are classified as being valid or artifact by determining values of a plurality of breathing parameters for a given breath, inferring a value for a key parameter from the determined values for the plurality of breathing parameters, and comparing the inferred value for the key parameter to a predetermined threshold.