Radiation pattern shaping of a two-element, concentric ring transducer using pha
Title:Radiation pattern shaping of a two-element, concentric ring transducer using phase and amplitude shading
Affiliation:AA(Naval Postgraduate School, Monterey, CA.)
Publication:M.S. Thesis Naval Postgraduate School, Monterey, CA.
Publication Date:12/1975
Category:Electronics and Electrical Engineering
NASA/STI Keywords:Electroacoustic Transducers, Sound Waves, Underwater Acoustics, Target Recognition, Tracking (Position), Underwater Vehicles
Bibliographic Code:
A high-frequency transducer which gives usefully uniform radiation into
a half space is required for use as a target locator in an underwater
acoustic range. Phase and amplitude shading of a two-element transducer
consisting of a central circular piston and a concentric annular ring
has been proposed to meet the requirement. A transducer resonant at 74
kHz but scaled in terms of wave length to 25 kHz in the transverse
dimension has been constructed and tested at both frequencies.
Exceptionally wide radiation patterns with major lobe widths of the
order of 150 degrees (10db down) were obtained. At the scaled frequency
computer model predictions based on simple theory agreed well with the
measured radiation patterns. At the resonant frequency, however,
predicted secondary lobe details were not found in the patterns. These
discrepancies have been attributed to the non-uniform motion of the
radiating surfaces due to mutual coupling effects through the transducer
structure and the transmission medium. In spite of these minor problems
associated with the prototype transducer, promising results have been
obtained and have shown the design concept to be a valid and viable one.
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On the Probability that Nothing Happens - II
Carlo Maccheroni() (Department of Economics and Statistics (Dipartimento di Scienze Economico-Sociali e Matematico-Statistiche), University of Torino, Italy)
AbstractWe analyze the probability that an isolated system (being a birth-cohort) remains unchanged along time, thus obtaining an experimental survival probability which perfectly matches with the theoretical results found in part I.
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Carlo Maccheroni, 2014.
028, Department of Economics and Statistics (Dipartimento di Scienze Economico-Sociali e Matematico-Statistiche), University of Torino.
Handle: RePEc:tur:wpapnw:028
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About RePEcComplete mitochondrial genomes of the Bright Sunbeam Curetis bulis and the Small Copper Lycaena... - Abstract - Europe PMC
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Laboratory of Molecular Evolution and Biodiversity, College of Life Sciences, Anhui Normal University, Wuhu, China.
Laboratory of Molecular Evolution and Biodiversity, College of Life Sciences, Anhui Normal University, Wuhu, China.
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Research Support, Non-U.S. Gov't, Journal Article
In this study, the complete mitochondrial genomes of Curetis bulis and Lycaena phlaeas were determined and analyzed. The circular genomes are 15,162 bp long for C. bulis and 15,280 bp long for L. phlaeas, with a total A+T content of 82.6 and 83.1%, respectively. Both mitogenomes contain 37 genes, and their gene orders are similar to those of other lepidopterans. All protein-coding genes (PCGs) are initiated by ATN codons, except for cox1, which is started with the CGA all PCGs terminate in the typical stop codon TAA, except for cox1, cox2, and nad4, which end with a single T. The codons TTA (Leu), ATT (Ile), TTT (Phe), ATA (Met), and AAT (Asn) appear the most frequently. Both of the mitogenome A+T-rich regions harbor the motif ATAGA, followed by a 19-bp poly(T) stretch, with C. bulis containing a microsatellite-like (AT)5 element next to the ATTTA motif, and L. phlaeas containing a microsatellite-like (TA)6 (AT) element next to the ATTTA motif. The phylogenetic trees of the 17 representative butterfly species, including the two species of this study, were reconstructed with the maximum likelihood and Bayesian inference methods, based on the 13 PCG nucleotide sequence data. The results of the phylogenetic analyses strongly supported the relationships of ((((Lycaenidae + Pieridae) + Nymphalidae) + Hesperiidae) + Papilionidae), which was markedly different from the traditional morphological view of the Lycaenidae and Nymphalidae considered to be sisters of each other.
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