Cross-talk paths in array transducers Guess, J.F.; Oakley, C.G.; Douglas, S.J. ...
1995 IEEE Ultrasonics Symposium. Proceedings. An International Symposium,
1995, Letnik:
2
Conference Proceeding
Cross-talk is an important component of array transducer performance. It directly affects low level ring down, and limits aperture and steering angles. This paper describes a method of analysis which ...helps to sort out the sources and paths of acoustic cross-talk to allow improved array design. A linear array was built up in a step by step fashion with cross-talk measured at each step. Standard gain-phase testing and a novel cross-talk analysis method using time waveforms were both used to describe the cross-talk. Results demonstrate the contributions of cross-talk through the backing and through the kerf filler at each level of construction.
Cotton rats, Sigmodon hispidus, were forced to swim in water at 2 and 10° C. Body temperatures ( T B) declined most rapidly during the first 6 minutes of the swim and the rate of fall was nearly ...halved during the remainder of the swim. The rate of decline in T B was more rapid in the 2 than in the 10° C bath, but the per cent change in T B at the end of the swimming was about the same at both bath temperatures (about 43 per cent). The mean T B of the 26 cotton rats tested was 21.4 ± 0.6° C at the end of swimming, and there was no significant difference in the total decline in T B at the two bath temperatures. The eosinophil count declined by 52.5 and 63.0 per cent in cotton rats swimming at 2 and 10° C, respectively, and there was no evident correlation between the magnitude of the eosinophil response and body weight, swimming time or percentage decrease in T B.
Views of Our Readers Hereth, Lee J.; Knibb, David G.; Hartline, R. Y. ...
American Bar Association journal,
07/1978, Letnik:
64, Številka:
7
Journal Article
