Synthesis of the Backscattering Form Function for a Solid Elastic Sphere Using the Sommerfeld-Watson Transformation

1993 ◽  
pp. 73-82
Author(s):  
Naum D. Veksler ◽  
Herbert Überall
Keyword(s):  
Elastic Sphere ◽  
Form Function ◽  
Watson Transformation

scholarly journals Constraints on the ecomorphological convergence of zooplanktivorous butterflyfishes

2021 ◽  
Author(s):  
Jennifer R Hodge ◽  
Yutong Song ◽  
Molly A Wightman ◽  
Analisa Milkey ◽  
Binh Tran ◽  
...  
Keyword(s):  
Evolutionary History ◽  
Swimming Performance ◽  
Morphological Evolution ◽  
Distinct Type ◽  
Ancestral State ◽  
Multiple Traits ◽  
Visual Identification ◽  
Form Function ◽  
Morphological Distinction ◽  
Foraging Modes

Abstract Whether distantly related organisms evolve similar strategies to meet the demands of a shared ecological niche depends on their evolutionary history and the nature of form-function relationships. In fishes, the visual identification and consumption of microscopic zooplankters, selective zooplanktivory, is a distinct type of foraging often associated with a suite of morphological specialisations. Previous work has identified inconsistencies in the trajectory and magnitude of morphological change following transitions to selective zooplanktivory, alluding to the diversity and importance of ancestral effects. Here we investigate whether transitions to selective zooplanktivory have influenced the morphological evolution of marine butterflyfishes (family Chaetodontidae), a group of small-prey specialists well known for several types of high-precision benthivory. Using Bayesian ancestral state estimation, we inferred the recent evolution of zooplanktivory among benthivorous ancestors that hunted small invertebrates and browsed by picking or scraping coral polyps. Traits related to the capture of prey appear to be functionally versatile with little morphological distinction between species with benthivorous and planktivorous foraging modes. In contrast, multiple traits related to prey detection or swimming performance are evolving toward novel, zooplanktivore-specific optima. Despite a relatively short evolutionary history, general morphological indistinctiveness, and evidence of constraint on the evolution of body size, convergent evolution has closed a near significant amount of the morphological distance between zooplanktivorous species. Overall, our findings describe the extent to which the functional demands associated with selective zooplanktivory have led to generalisable morphological features among butterflyfishes and highlight the importance of ancestral effects in shaping patterns of morphological convergence.

Intonazione e significato: l’esempio dell’italiano regionale di Bergamo

2018 ◽  
Vol 69 (1) ◽  
pp. 35-55
Author(s):  
Giorgio Antonioli ◽  
Manuela Caterina Moroni
Keyword(s):  
Conversation Analysis ◽  
Empirical Data ◽  
Speech Act ◽  
Research Project ◽  
Preliminary Results ◽  
Form Function ◽  
Distinctive Type ◽  
Selection Of

Abstract In this paper we present a selection of preliminary results of our research project “Intonation and Meaning”, in which we compare recurrent intonation contours in German and Italian regional varieties. We apply the method of German Interactional Prosody Research (Interaktionale Prosodieforschung), which in turn is based on Conversation Analysis, to a sample of selfcollected empirical data. Our aim is to show the value of intonation as a resource to contextualize speech activities and to point out form-function relationships between intonation patterns and speech act types. In this respect, we observe the usage of intonation contours with rising accent (L*H) and with falling accent (H*L) in the utterance of question activities, and provide evidence for the fact that the latter represent a distinctive type of questions with epistemic presupposition, whereas L*H correlates rather with default, modally unmarked questions.

scholarly journals Continuum elastic sphere vibrations as a model for low lying optical modes in icosahedral quasicrystals

2005 ◽  
Vol 17 (23) ◽  
pp. 3559-3565 ◽  
Author(s):  
E Duval ◽  
L Saviot ◽  
A Mermet ◽  
D B Murray
Keyword(s):  
Elastic Sphere ◽  
Optical Modes ◽  
Icosahedral Quasicrystals
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