2,337 research outputs found
Stenopus earlei Goy 1984
No full textStenopus earlei Goy, 1984 (Fig. 31) Stenopus earlei Goy, 1984: 117, color plate, p. 12. Stenopus earlei. — Goy & Randall, 1986: 91.—Goy, 1992: 100.— Debelius & Baensch, 1994: 561, color figure.— Debelius, 2001: 120, color figure.—Saito et al., 2009: 118.— Goy, 2010: 216, 223.— De Grave & Fransen, 2011: 253. Material examined. Loyalty Islands. MUSORSTOM 6, stn DW 474, 21°08.80’S, 167 ° 55.50 ’E, 260 m, 22.II.1989, 1 male (MNHN-NA 11988). Measurements (mm). PCL: 4.1; RCL: 8.8; TL: 19.5. Distribution. The species is known from type material collected in the Hawaiian and Comoro Islands. This author has examined specimens from Ashmore Reef, Coral Sea, Queensland, Australia (NTM Cr 0 110285, NTM Cr 0 10645, NTM Cr 010679) and Madagascar (MNHN-NA 3589, MNHN-NA 3590, MNHN-NA 4362). The present record extends the species’ range west of New Caledonia. Coloration. The color pattern of Stenopus earlei is presented by Goy & Randall (1986). Keys based on color pattern that will separate this species from other species of Stenopus are presented by Goy (1992), Walls & Hunziker (1995), and Saito et al. (2009). Remarks. This single specimen lacks third pereiopods and shows some differences from the type material. Main differences are lengths of rostrum, scaphocerite and sixth abdominal pleuron as well as 13 carpal segments versus 9 in the types on the last 2 pairs of pereiopods. Also, the dorsal bare area on the third abdominal pleuron bears 6 spines compared to the 18–24 spines on the type material. Spination of the carapace, caudal fan and third maxilliped (Fig. 31) does not vary from the types. The New Caledonian specimen was collected at 260 m, the deepest record for the genus. Collection at this depth and possession of all the juvenile characteristics mentioned earlier for S. hispidus, may indicate the specimen represents the decapodid recently metamorphosed and settled out of the plankton. Contrary to this hypothesis, is its large size of 19.5 mm, larger than the type material where ovigerous females were 15.5–15.7 mm total length. However, if one takes into account the elongated rostrum and sixth abdominal pleuron of the New Caledonian specimen, it is in reality smaller than all of type specimens. As mentioned earlier, there must be a size range at settlement for members of the genus Stenopus that would account for juveniles of variable lengths.Published as part of Goy, Joseph W., 2015, Stenopodidean shrimps (Crustacea: Decapoda) from New Caledonian waters, pp. 301-344 in Zootaxa 4044 (3) on pages 340-341, DOI: 10.11646/zootaxa.4044.3.1, http://zenodo.org/record/24046
The jurassic brachiopods in the "Aparato para la historia natural española" by José Torrubia (1754)
No full textJurassic brachiopods collected by Torrubia in the Molina de Aragón Area and described by this author in 1754 are studied. Most of the specimens figured on his publication have been assignated to the species currently recognized in the region.Depto. de Geodinámica, Estratigrafía y PaleontologíaFac. de Ciencias GeológicasTRUEpu
Bibliographie critique
No full textB S, Kiss Alexandre Charles, F. R., T. P., Voelckel Michel, M. J., Goy Raymond, V. D., S. A., N.E.S. , Schloh B., Pick H. H., D. Y., Tavernier Paul, Bette Augusto. Bibliographie critique. In: Annuaire français de droit international, volume 11, 1965. pp. 1115-1156
Bibliographie critique
No full textB S, Kiss Alexandre Charles, F. R., T. P., Voelckel Michel, M. J., Goy Raymond, V. D., S. A., N.E.S. , Schloh B., Pick H. H., D. Y., Tavernier Paul, Bette Augusto. Bibliographie critique. In: Annuaire français de droit international, volume 11, 1965. pp. 1115-1156
The importance of physical pre-processors for quantitative phase retrieval under extremely low photon counts
No full text© 2019 SPIE. In a recent paper [Goy et al., Phys. Rev. Lett. 121, 243902, 2018], we showed that deep neural networks (DNNs) are very efficient solvers for phase retrieval problems, especially when the photon budget is limited. However, the performance of the DNN is strongly conditioned by a preprocessing step that consists in producing a proper initial guess. In this paper, we study the influence of the preprocessing in more details, in particular the choice of the preprocessing operator. We also empirically demonstrate that, for a DenseNet architecture, the performance of the DNN increases with the number of layers up to a point after which it saturates
Weakening and Iterating Laws using String Diagrams
No full textDistributive laws are a standard way of combining two monads, providing a
compositional approach for reasoning about computational effects in semantics.
Situations where no such law exists can sometimes be handled by weakening the
notion of distributive law, still recovering a composite monad. A celebrated
result from Eugenia Cheng shows that combining monads is possible by
iterating more distributive laws, provided they satisfy a coherence condition
called the Yang-Baxter equation. Moreover, the order of composition does not
matter, leading to a form of associativity. The main contribution of this paper
is to generalise the associativity of iterated composition to weak distributive
laws in the case of monads. To this end, we use string-diagrammatic
notation, which significantly helps make increasingly complex proofs more
readable. We also provide examples of new weak distributive laws arising from
iteration.Comment: Conference version (proceedings of MFPS 2022
Limited-angle tomographic reconstruction of dense layered objects by dynamical machine learning
No full textLimited-angle tomography of strongly scattering quasi-transparent objects is a challenging, highly ill-posed problem with practical implications in medical and biological imaging, manufacturing, automation, and environmental and food security. Regularizing priors are necessary to reduce artifacts by improving the condition of such problems. Recently, it was shown that one effective way to learn the priors for strongly scattering yet highly structured 3D objects, e.g. layered and Manhattan, is by a static neural network [Goy et al, Proc. Natl. Acad. Sci. 116, 19848-19856 (2019)]. Here, we present a radically different approach where the collection of raw images from multiple angles is viewed analogously to a dynamical system driven by the object-dependent forward scattering operator. The sequence index in angle of illumination plays the role of discrete time in the dynamical system analogy. Thus, the imaging problem turns into a problem of nonlinear system identification, which also suggests dynamical learning as better fit to regularize the reconstructions. We devised a recurrent neural network (RNN) architecture with a novel split-convolutional gated recurrent unit (SC-GRU) as the fundamental building block. Through comprehensive comparison of several quantitative metrics, we show that the dynamic method improves upon previous static approaches with fewer artifacts and better overall reconstruction fidelity.12 pages, 7 figures, 2 table
Low Photon Count Phase Retrieval Using Deep Learning
No full textImaging systems’ performance at low light intensity is affected by shot noise, which becomes increasingly strong as the power of the light source decreases. In this Letter, we experimentally demonstrate the use of deep neural networks to recover objects illuminated with weak light and demonstrate better performance than with the classical Gerchberg-Saxton phase retrieval algorithm for equivalent signal over noise ratio. The prior contained in the training image set can be leveraged by the deep neural network to detect features with a signal over noise ratio close to one. We apply this principle to a phase retrieval problem and show successful recovery of the object’s most salient features with as little as one photon per detector pixel on average in the illumination beam. We also show that the phase reconstruction is significantly improved by training the neural network with an initial estimate of the object, as opposed to training it with the raw intensity measurement
Stenopus hispidus Olivier 1811
No full textStenopus hispidus (Olivier, 1811) (Figs. 27, 28) Palaemon hispidus Olivier, 1811: 666. Stenopus hispidus.— Latreille, 1819: 71.— Holthuis, 1946: 12. (with references and complete synonomy).— Yaldwyn, 1968: 278.—de Saint-Laurent & Cleva, 1981: 157.—Goy, 1992: 100 — Saito et al., 2009: 109.— Goy, 2010: 215. — De Grave & Fransen, 2011: 253. Material examined. New Caledonia. Lagoon, Aubry Lacomte 241 -63, 1903, det. Bouvier 1907, 1 male, 1 female (MNHN-NA 3570).—Lagoon, coll. Bougier 1903, det. Bouvier 1907, 1 male, 1 female ov. (MNHN-NA 3573).— Mission Singer-Polignac, Phares Amedes, Noumea, coll. Salvat, 30.XII.1961, 1 male (MNHN-NA).—Aquarium de Noumea, don. C. Vadon, 17.II.1977, 1 male (MNHN-NA 3489).—Baie de Poya, 21 ° 23 ’S, 165 °04’E, coll. F. Conand, chatutage, 5–12m 10.XII.1982, 1 male (MNHN-NA).—Lagon Sud-Ouest, Campaign No. 2. stn 104, Ile Ouen, Baie du Prony, 22 ° 26 ’S, 166 ° 40 ’E, 24 m, VIII.1984, 1 female ov. (MNHN-NA).—MUSORSTOM 4, stn CC147, 19° 35 ’S, 163 ° 39.06 ’E, 43 m, 13.IX.1985, 1 male (MNHN-NA 11990). —Baie de Saint Vincent, coll. M. Kilbriki, chalutage, VIII 1985, 1 male, 1 female (MNHN-NA—Baie de Saint Vincent, chalutage, 23.IV.1986, 3 males, 1 female ov. (MNHM-NA).—Lagon Nord-Ouest, Campaign No. 12, stn DW916, 20° 55.5 ’S, 164 ° 28.3 ’E, 13 m, 26.IV.1988, 1 male (MNHN-NA).—Lagon Nord, Campaign No. 13, stn DW1067, 19° 55.8 ’S, 163 ° 52.8 ’E, 28 m, 23.X.1989, 14 males, 1 female ov. (MNHN-NA).—stn DW1069, 19° 59.1 ’S, 163 ° 52.5 ’E, 3 m, 23.X.1989, 1 male (MNHN-NA).—stn 1072, 19° 50 ’S, 164 ° 40 ’E, 20 m, 23.X.1989, 1 male (MNHN-NA).— Chesterfield Islands. CORAIL 2, Plateau des Chesterfield, oust Nouvelle Caledonia, Iles Bellona, VIII.1988, 4 males, 2 females, 1 ov.) (MNHN-NA).— Loyalty Islands. MUSORSTOM 6, stn DW430, 20° 21.17 ’S, 166 °07.25’E, 30 m, 17.II.1989, 1 male (MNHN-NA 11989).—Mare Island, reef, 1 male, 1 female (MNHN-NA). Measurements (mm). Males, PCL: 5.2 –11.0; RCL: 7.1–17.5; TL: 44.1–55.8.—Females, PCL: 11.6 –15.0; RCL: 16.8–21.5; TL: 44.1–55.8.—Females ov., PCL: 10.0– 13.4; RCL: 12.9 –17.0; TL: 38.1 –47.0. Distribution. Stenopus hispidus is the only pantropical species in the infraorder Stenopodidea. Previously recorded from the Western Atlantic from Cape Lookout, North Carolina, throughout the Caribbean and Gulf of Mexico to the southern border of Brazil (Williams 1984); central Atlantic from Ascension Island (Manning & Chace 1990); Eastern Pacific from Taboga Island, Panama (Goy 1987, 1992b); and throughout the tropical and warm temperate Pacific (Holthuis 1946). Coloration. Good descriptions of the color pattern for this species are given by Holthuis (1946) and Yaldwyn (1968). Laboute & Magnier (1987) published a color photograph of Stenopus hispidus from New Caledonia. Remarks. Stenopus hispidus is a well known species that has become widely recognized as a symbol of tropical marine biodiversity and is not redescribed here. The species has been previously recorded from New Caledonia (Yaldwyn 1968; Laboute & Magnier 1987; Junker & Poupin 2009; Poupin & Junker 2010). The material examined here was collected between 2–43 m which is within the recorded depth range for the species: intertidal waters to 210 m (Holthuis 1946). From Philippine material, de Saint-Laurent & Cleva (1981) described two juveniles of S. hispidus of 17.0 and 18.0 mm total length and they believed the specimen of 17.0 mm represented the first postlarval stage. The present author has examined over 700 specimens of S. hispidus from all areas of its wide zoogeographical distribution. The smallest first postlarval stage or decapodid (Felder et al. 1985) found in this large sample size was a specimen from Howland Island, 0° 48 ’N, 176 ° 38 ’W (USNM 25187) measuring 9.6 mm total length and having rudimentary exopods on the pereiopods. The smallest ovigerous female examined was 25.6 mm total length. Eighty-four specimens examined were less than 25.0 mm total length, which is, therefore taken as the approximate size at which sexual maturity is reached for this species. Specimens below this length all exhibit the juvenile characteristics attributed to postlarval stages by Rathbun (1906), Holthuis (1946), de Saint-Laurent & Cleva (1981) and Goy (1990), which include a relatively longer antennule peduncle, rostrum, sixth abdominal pleuron and propodus of the third pereiopod; less spinous carapace and abdomen; and a very large dorsal median projection on the third abdominal pleuron. Within the 84 juveniles examined, 57 specimens, ranging in total length from 9.6– 18.2 mm, had remnants of larval exopods on the pereiopods. Members of the genus Stenopus exhibit extreme plasticity in their larval developmental patterns. This has been demonstrated by laboratory rearings of larvae (Castro & Jory 1983; Goy 1990; Fletcher et al. 1995; Zhang et al. 1997) as well as reported size variations of plankton caught larvae (Gurney 1936; Lebour 1941; Williamson 1976). Due to this plasticity, the actual size at metamorphosis may vary by as much as 9.0 mm depending on the duration of larval development and the nutritional state of the metamorphically competent larvae (Goy 1990). Postlarval differences between Pacific and Atlantic populations of S. hispidus are not yet known.Published as part of Goy, Joseph W., 2015, Stenopodidean shrimps (Crustacea: Decapoda) from New Caledonian waters, pp. 301-344 in Zootaxa 4044 (3) on pages 336-338, DOI: 10.11646/zootaxa.4044.3.1, http://zenodo.org/record/24046
Corrélations entre le corps et la doctrine bouddhique dans le shugendô d’Akyûbô Sokuden (xvie siècle)
No full textLa présente contribution propose de mettre en avant le travail du moine Akyûbô Sokuden, un des premiers intellectuels japonais à avoir tenté au xvie siècle de définir la voie de l’ascèse religieuse dite shugendô, dont la tradition a longtemps été tenue secrète, et de présenter la place et la fonction que tient le corps du pratiquant au cœur de cette voie ésotérique dans son œuvre majeure, le Shugen shûyô hiketsu-shû ou Recueil des arcanes essentiels à la pratique du shugen (1521‑1528). Les mises en corrélations entre le corps du shugenja ou du yamabushi, les accessoires, les pratiques posturales et la doctrine bouddhique issue du mahāyāna montrent comment l’auteur rattache cette tradition ascétique à la recherche du surgissement de la bouddhéité présente en chaque être.This paper seeks to highlight the work of the monk Akyûbô Sokuden, one of the first Japanese scholars to have tried, in the 16th century, to define the ascetic religious practice of shugendô, whose tradition was kept secret for many years. The paper also describes the place and function of the adept’s body, at the heart of this esoteric path, in his major work, the Shugen shûyô hiketsu-shû (1521‑1528). The correlations he draws between the body of the shugenja or of the yamabushi, his accessories and postural practices and Buddhist doctrine resulting from the mahāyāna show how the author links this ascetic tradition to the desire to bring out the Buddhist present in every human being
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