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Littérature scientifique sur le sujet « Frog with a tail »

Auteur : Grafiati
Publié le 4 juin 2021
Mis à jour le 16 février 2022

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Articles de revues sur le sujet "Frog with a tail"

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Verissimo, Kellen Matos, Louise Neiva Perez, Aline Cutrim Dragalzew, Gayani Senevirathne, Sylvain Darnet, Wainna Renata Barroso Mendes, Ciro Ariel dos Santos Neves et al. « Salamander-like tail regeneration in the West African lungfish ». Proceedings of the Royal Society B : Biological Sciences 287, no 1935 (16 septembre 2020) : 20192939. http://dx.doi.org/10.1098/rspb.2019.2939.

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Salamanders, frog tadpoles and diverse lizards have the remarkable ability to regenerate tails. Palaeontological data suggest that this capacity is plesiomorphic, yet when the developmental and genetic architecture of tail regeneration arose is poorly understood. Here, we show morphological and molecular hallmarks of tetrapod tail regeneration in the West African lungfish Protopterus annectens , a living representative of the sister group of tetrapods. As in salamanders, lungfish tail regeneration occurs via the formation of a proliferative blastema and restores original structures, including muscle, skeleton and spinal cord. In contrast with lizards and similar to salamanders and frogs, lungfish regenerate spinal cord neurons and reconstitute dorsoventral patterning of the tail. Similar to salamander and frog tadpoles, Shh is required for lungfish tail regeneration. Through RNA-seq analysis of uninjured and regenerating tail blastema, we show that the genetic programme deployed during lungfish tail regeneration maintains extensive overlap with that of tetrapods, with the upregulation of genes and signalling pathways previously implicated in amphibian and lizard tail regeneration. Furthermore, the lungfish tail blastema showed marked upregulation of genes encoding post-transcriptional RNA processing components and transposon-derived genes. Our results show that the developmental processes and genetic programme of tetrapod tail regeneration were present at least near the base of the sarcopterygian clade and establish the lungfish as a valuable research system for regenerative biology.
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Sutro, J. B. « Kinetics of veratridine action on Na channels of skeletal muscle. » Journal of General Physiology 87, no 1 (1 janvier 1986) : 1–24. http://dx.doi.org/10.1085/jgp.87.1.1.

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Veratridine bath-applied to frog muscle makes inactivation of INa incomplete during a depolarizing voltage-clamp pulse and leads to a persistent veratridine-induced Na tail current. During repetitive depolarizations, the size of successive tail currents grows to a plateau and then gradually decreases. When pulsing is stopped, the tail current declines to zero with a time constant of approximately 3 s. Higher rates of stimulation result in a faster build-up of the tail current and a larger maximum value. I propose that veratridine binds only to open channels and, when bound, prevents normal fast inactivation and rapid shutting of the channel on return to rest. Veratridine-modified channels are also subject to a "slow" inactivation during long depolarizations or extended pulse trains. At rest, veratridine unbinds with a time constant of approximately 3 s. Three tests confirm these hypotheses: (a) the time course of the development of veratridine-induced tail currents parallels a running time integral of gNa during the pulse; (b) inactivating prepulses reduce the ability to evoke tails, and the voltage dependence of this reduction parallels the voltage dependence of h infinity; (c) chloramine-T, N-bromoacetamide, and scorpion toxin, agents that decrease inactivation in Na channels, each greatly enhance the tail currents and alter the time course of the appearance of the tails as predicted by the hypothesis. Veratridine-modified channels shut during hyperpolarizations from -90 mV and reopen on repolarization to -90 mV, a process that resembles normal activation gating. Veratridine appears to bind more rapidly during larger depolarizations.
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AFONSO, Andre Muniz, Ana Beatriz Monteiro FONSECA, Carlos Adam CONTE-JUNIOR, Eliane Teixeira MÁRSICO, Mônica Queiroz FREITAS et Sergio Borges MANO. « Frog tail : a source of protein to feed the future ». Boletim do Instituto de Pesca 43, no 1 (30 mars 2017) : 112–23. http://dx.doi.org/10.20950/1678-2305.2017v43n1p112.

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Bennett, A. M., et D. L. Murray. « Carryover effects of phenotypic plasticity : embryonic environment and larval response to predation risk in Wood Frogs (Lithobates sylvaticus) and Northern Leopard Frogs (Lithobates pipiens) ». Canadian Journal of Zoology 93, no 11 (novembre 2015) : 867–77. http://dx.doi.org/10.1139/cjz-2015-0129.

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Limitations of phenotypic plasticity affect the success of individuals and populations in changing environments. We assessed the plasticity-history limitation on predator-induced defenses in anurans (Wood Frogs, Lithobates sylvaticus (LeConte, 1825), and Northern Leopard Frogs, Lithobates pipiens (Schreber, 1782)), predicting that plastic responses to predation risk by dragonfly larvae (family Aeshnidae) in the embryonic environment would limit the defensive response to predators in the larval environment. Predator-conditioned Wood Frog embryos increased relative tail depth in response to those same cues as larvae, whereas predator-naive tadpoles did not. However, no carryover effect was noted in the behavioural response of Wood Frog tadpoles to predation risk. Predator-naive Northern Leopard Frog tadpoles increased relative tail depth in response to predation risk in the larval environment. Predator-conditioned Northern Leopard Frog embryos hatched with, and maintained, a marginal increase in tail depth as larvae in the absence of predation risk. Predator-conditioned Northern Leopard Frog embryos exposed to predation risk as larvae showed no morphological response. While we find no strong support for the plasticity-history limitation per se, carryover effects across embryonic and larval life-history stages were noted in both Wood Frog and Northern Leopard Frog, suggesting that predation risk early in ontogeny can influence the outcome of future interactions with predators.
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Brinckerhoff, Constance E., et Lynn M. Matrisian. « Matrix metalloproteinases : a tail of a frog that became a prince ». Nature Reviews Molecular Cell Biology 3, no 3 (mars 2002) : 207–14. http://dx.doi.org/10.1038/nrm763.

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SILVA-SOARES, THIAGO, PAULO NOGUEIRA COSTA, RODRIGO B. FERREIRA et LUIZ NORBERTO WEBER. « The tadpole of the hylid frog Scinax belloni (Anura : Hylidae) ». Zootaxa 2727, no 1 (23 janvier 2019) : 63. http://dx.doi.org/10.11646/zootaxa.2727.1.6.

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Scinax perpusillus group is composed by11 species. Only Scinax arduous, Scinax littoreus, Scinax. meloi, S. perpusillus, S. tupinamba, and S. v-signatus, have its tadpole described. Herein we described the tadpole of Scinax belloni and its internal oral features. Tadpoles of S. belloni were collected in bromeliads at the Parque Estadual do Forno Grande, municipality of Castelo, Espírito Santo, southeastern. Two tadpoles were reared to froglets in order to allow specific identification. The morphology of S. belloni tadpoles resemble the other known larvae in many aspects such as oval body in dorsal view, coloration, rounded snout in dorsal view, dorsolateral eyes, anteroventral mouth and labial tooth row formula 2(2)/3. In fact, at first sight, all known tadpoles are very similar from each other. Nevertheless, they do can be distinguished by some characters as the shape of lower jaw; number of row of labial papillae; the size of the fins; height of tail and the body; whether musculature of tail reaches its tip and if tail ends rounded or pointed. S. belloni tadpoles are readily differentiated from the other known Scinax gr. perpusillus species tadpoles by the presence of a dark band that goes along the dorsal and ventral fin. The internal oral morphology of S. belloni is also described.
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Vitt, Laurie J., et William E. Cooper Jr. « Tail loss, tail color, and predator escape in Eumeces (Lacertilia : Scincidae) : age-specific differences in costs and benefits ». Canadian Journal of Zoology 64, no 3 (1 mars 1986) : 583–92. http://dx.doi.org/10.1139/z86-086.

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The tail loss adaptation in Eumeces of the southeastern United States is complex. Juveniles possess tails that are colored differently from those of adults and apparently distract the attention of potential predators from the body to the tail. Adult tails are cryptically colored. Frequency of tail loss is high across size groups. Experiments on growth of tailed and tailless juveniles suggest no effect of tail loss on growth and, thus, there may be little cost of tail loss to juveniles other than the temporary loss of the autotomy adaptation. Lipids in adult tails constitute nearly 50% of total standing lipids and are reduced during reproduction similar to other lipid reserves. This suggests that tail loss in adults is expensive, particularly prior to or during the breeding season. We suggest that the high costs of tail loss in Eumeces are offset by the increased probability of predator escape via tail loss. Tail loss data are minimal estimates of escape via distraction of a predator's attack to the tail as indicated by predation experiments. The presence, coloration, and behaviors of the tail may result in a high proportion of predation attempts being redirected to the tail followed by total misses.
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Joshy, Hareesh, et Mitsuru Kuramoto. « Scanning electron microscopic studies on spermatozoa of anurans from India and Sri Lanka ». Amphibia-Reptilia 22, no 3 (2001) : 303–8. http://dx.doi.org/10.1163/156853801317050098.

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AbstractThe shape and size of spermatozoa of 11 frog species from India and Sri Lanka were examined by scanning electron microscopy. The spermatozoa of the genera Limnonectes and Euphlyctis were of the generalized type with a thick sperm head and a thin tail, whereas Indirana semipalmata had peculiar spermatozoa with a densely coiled sperm head and a thick tail. Rhacophorus microtympanum is likely to belong to the genus Philautus from sperm morphology. The spermatozoa of Microhyla ornata and Ramanella obscura were very similar, with a cone-shaped sperm head and a thin tail.
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VON SECKENDORFF HOFF, KARIN, et RICHARD JOEL WASSERSUG. « The Kinematics of Swimming in Larvae of the Clawed Frog, Xenopus Laevis ». Journal of Experimental Biology 122, no 1 (1 mai 1986) : 1–12. http://dx.doi.org/10.1242/jeb.122.1.1.

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The kinematics of swimming in larval Xenopus laevis has been studied using computer-assisted analysis of high-speed (200 frames s−1) ciné records. The major findings are as follows. 1. At speeds below 6 body lengths (L) per second, tail beat frequency is approximately 10 Hz and, unlike for most aquatic vertebrates, is not correlated with specific swimming speed. At higher speeds, tail beat frequency and speed are positively correlated. 2. Xenopus tadpoles show an increase in the maximum amplitude of the tail beat with increasing velocity up to approximately 6Ls−1. Above that speed amplitude approaches an asymptote at 20 % of body length. 3. Anterior yaw is absent at velocities below 6Ls−1, unlike for other anuran larvae, but is present at higher speeds. 4. At speeds below 6Ls−1 there is a positive linear relationship between length of the propulsive wave (λ) and specific swimming speed. At higher speeds wavelength is constant at approximately 0.8L. 5. There is a shift in the modulation of wavelength and tail beat frequency with swimming speed around 5.6Ls−1, suggesting two different swimming modes. The slower mode is used during open water cruising and suspension feeding. The faster, sprinting mode may be used to avoid predators. 6. Froude efficiencies are similar to those reported for fishes and other anuran larvae. 7. Unlike Rana and Bufo larvae, the axial muscle mass of Xenopus increases dramatically with size from less than 10% of total mass for the smallest animals to more than 45% of total mass for the largest animals. This increase is consistent with maintaining high locomotor performance throughout development.
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Schwaner, M. Janneke, Grace A. Freymiller, Rulon W. Clark et Craig P. McGowan. « How to Stick the Landing : Kangaroo Rats Use Their Tails to Reorient during Evasive Jumps Away from Predators ». Integrative and Comparative Biology 61, no 2 (3 mai 2021) : 442–54. http://dx.doi.org/10.1093/icb/icab043.

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Synopsis Tails are widespread in the animal world and play important roles in locomotor tasks, such as propulsion, maneuvering, stability, and manipulation of objects. Kangaroo rats, bipedal hopping rodents, use their tail for balancing during hopping, but the role of their tail during the vertical evasive escape jumps they perform when attacked by predators is yet to be determined. Because we observed kangaroo rats swinging their tails around their bodies while airborne following escape jumps, we hypothesized that kangaroo rats use their tails to not only stabilize their bodies while airborne, but also to perform aerial re-orientations. We collected video data from free-ranging desert kangaroo rats (Dipodomys deserti) performing escape jumps in response to a simulated predator attack and analyzed the rotation of their bodies and tails in the yaw plane (about the vertical-axis). Kangaroo rat escape responses were highly variable. The magnitude of body re-orientation in yaw was independent of jump height, jump distance, and aerial time. Kangaroo rats exhibited a stepwise re-orientation while airborne, in which slower turning periods corresponded with the tail center of mass being aligned close to the vertical rotation axis of the body. To examine the effect of tail motion on body re-orientation during a jump, we compared average rate of change in angular momentum. Rate of change in tail angular momentum was nearly proportional to that of the body, indicating that the tail reorients the body in the yaw plane during aerial escape leaps by kangaroo rats. Although kangaroo rats make dynamic 3D movements during their escape leaps, our data suggest that kangaroo rats use their tails to control orientation in the yaw plane. Additionally, we show that kangaroo rats rarely use their tail length at full potential in yaw, suggesting the importance of tail movement through multiple planes simultaneously.
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Thèses sur le sujet "Frog with a tail"

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Tucker, Abigail Saffron. « Tail development in Xenopus laevis ». Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297296.

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Alexandersson, Ilona. « Comet Ion Tail Observations Far From the Nucleus ». Thesis, Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-150106.

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On may 1, 1996, Ulysses spacecraft crossed the ion tail of comet Hyakutake, revealing an ion tail length of more than 3 times the Sun-Earth distance. The signatures of an ion tail, especially the ion tail far from the nucleus, are not well explored and many question marks remain. This report summarizes previous observations of spacecraft - ion tail crossings and what signatures that can be expected, as well as signatures of other known solar wind structures. A data analysis is made of possible ion tail encounters from Rosetta spacecraft measurements, Ulysses spacecraft measurements and Earth-orbiting spacecraft measurements. A search from Venus Express data to detect ion tails of sungrazing comets is presented.
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Leal, Laura Simonsen. « An SDF approach to hedge funds’ tail risk : evidence from Brazilian funds ». reponame:Repositório Institucional do FGV, 2016. http://hdl.handle.net/10438/16638.

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The main purpose of this paper is to propose a methodology to obtain a hedge fund tail risk measure. Our measure builds on the methodologies proposed by Almeida and Garcia (2015) and Almeida, Ardison, Garcia, and Vicente (2016), which rely in solving dual minimization problems of Cressie Read discrepancy functions in spaces of probability measures. Due to the recently documented robustness of the Hellinger estimator (Kitamura et al., 2013), we adopt within the Cressie Read family, this specific discrepancy as loss function. From this choice, we derive a minimum Hellinger risk-neutral measure that correctly prices an observed panel of hedge fund returns. The estimated risk-neutral measure is used to construct our tail risk measure by pricing synthetic out-of-the-money put options on hedge fund returns of ten specific categories. We provide a detailed description of our methodology, extract the aggregate Tail risk hedge fund factor for Brazilian funds, and as a by product, a set of individual Tail risk factors for each specific hedge fund category.
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Johnson, Christopher David. « Characteristics of sympathetic nerve activity recorded from blood vessels of the rat tail ». Thesis, University College London (University of London), 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267856.

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Dailey, Simon Christopher. « Evolutionary developmental and genomic insights from a tail regeneration transcriptome of the cephalochordate Branchiostoma lanceolatum ». Thesis, University of St Andrews, 2017. http://hdl.handle.net/10023/12608.

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Wu, Sirui. « A study on Extraction of Natural Cities from the Nightlight Imagery Using Head/tail breaks method ». Thesis, Högskolan i Gävle, Avdelningen för Industriell utveckling, IT och Samhällsbyggnad, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-15767.

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With the high development of economic and demand for city research, an issue of detecting city boundaries plays an extremely important role in urbanization that promotes the progress of human civilization. Some critical applications such as land use, urban planning and city sprawl have been constantly discussed, which rely on the acquisition of city areas. For the better acquisition of city areas, choosing a proper method to capture city boundaries becomes significant where it greatly improves the value of city study. Although conventional data can be used to define the city boundaries, some drawbacks still exist when measuring the city boundaries in a global scale. Remote sensing (RS) data of nightlight imagery (2010) by Defense Meteorological Satellite Program’s Operational Linescan System (DMSP/OLS) acquired from National oceanic and atmospheric administration's National Geoscience Data Center (NOAA/NOGA) is applied to extract the city boundaries in fifty countries, of which these countries are chosen followed by the Gross Domestic Product that are ranked in top 50. In this case, the data distribution of nightlight imagery followed by heavy-tailed distribution. Head/tail break algorithm poses a possibility of calculating reasonable threshold and extracting the natural cities with the help of software based on the Geomatics information system (GIS). An extended study of power law is made by using of power law estimator from previous studies to check whether the extracted natural cities can match the power law distribution. Result shows that combination of the nightlight imagery data and the head/tail break is capable of extracting the city boundaries and a set of possible thresholds with visual inspection by using the head/tail break are executed. There is only one country, namely Belgium, cannot be processed due to its data properties. Result also address how well the natural cities of the fifty countries can be extracted in terms of visual inspection, among the chosen cities, 33 of countries boundaries can be better matched and 13 countries can fundamentally match the city boundaries. Meanwhile, an extended study of power law is provided and four countries have to be found that do not follow the power law distribution. From the result obtained, the study expects that integration of support data will efficiently increase the accuracy of extraction and more useful information can be acquired in further study. On the other hand, a comparative study of threshold decision needs to be verified, put it differently, whether using head/tail break with visual inspection on extracted city boundaries is helpful or not.
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Wigle, Jeffrey T. « Molecular cloning, characterization and expression of a novel family of tail-anchored membrane proteins from the myocardium ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ28383.pdf.

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Hernandez, Javiera I. « Does the Pareto Distribution of Hurricane Damage Inherit its Fat Tail from a Zipf Distribution of Assets at Hazard ? » FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1488.

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Tropical Cyclones are a continuing threat to life and property. Willoughby (2012) found that a Pareto (power-law) cumulative distribution fitted to the most damaging 10% of US hurricane seasons fit their impacts well. Here, we find that damage follows a Pareto distribution because the assets at hazard follow a Zipf distribution, which can be thought of as a Pareto distribution with exponent 1. The Z-CAT model is an idealized hurricane catastrophe model that represents a coastline where populated places with Zipf- distributed assets are randomly scattered and damaged by virtual hurricanes with sizes and intensities generated through a Monte-Carlo process. Results produce realistic Pareto exponents. The ability of the Z-CAT model to simulate different climate scenarios allowed testing of sensitivities to Maximum Potential Intensity, landfall rates and building structure vulnerability. The Z-CAT model results demonstrate that a statistical significant difference in damage is found when only changes in the parameters create a doubling of damage.
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HUANG, KUAN-YU. « Fractal or Scaling Analysis of Natural Cities Extracted from Open Geographic Data Sources ». Thesis, Högskolan i Gävle, Avdelningen för Industriell utveckling, IT och Samhällsbyggnad, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-19386.

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A city consists of many elements such as humans, buildings, and roads. The complexity of cities is difficult to measure using Euclidean geometry. In this study, we use fractal geometry (scaling analysis) to measure the complexity of urban areas. We observe urban development from different perspectives using the bottom-up approach. In a bottom-up approach, we observe an urban region from a basic to higher level from our daily life perspective to an overall view. Furthermore, an urban environment is not constant, but it is complex; cities with greater complexity are more prosperous. There are many disciplines that analyze changes in the Earth’s surface, such as urban planning, detection of melting ice, and deforestation management. Moreover, these disciplines can take advantage of remote sensing for research. This study not only uses satellite imaging to analyze urban areas but also uses check-in and points of interest (POI) data. It uses straightforward means to observe an urban environment using the bottom-up approach and measure its complexity using fractal geometry.   Web 2.0, which has many volunteers who share their information on different platforms, was one of the most important tools in this study. We can easily obtain rough data from various platforms such as the Stanford Large Network Dataset Collection (SLNDC), the Earth Observation Group (EOG), and CloudMade. The check-in data in this thesis were downloaded from SLNDC, the POI data were obtained from CloudMade, and the nighttime lights imaging data were collected from EOG. In this study, we used these three types of data to derive natural cities representing city regions using a bottom-up approach. Natural cities were derived from open geographic data without human manipulation. After refining data, we used rough data to derive natural cities. This study used a triangulated irregular network to derive natural cities from check-in and POI data.   In this study, we focus on the four largest US natural cities regions: Chicago, New York, San Francisco, and Los Angeles. The result is that the New York City region is the most complex area in the United States. Box-counting fractal dimension, lacunarity, and ht-index (head/tail breaks index) can be used to explain this. Box-counting fractal dimension is used to represent the New York City region as the most prosperous of the four city regions. Lacunarity indicates the New York City region as the most compact area in the United States. Ht-index shows the New York City region having the highest hierarchy of the four city regions. This conforms to central place theory: higher-level cities have better service than lower-level cities. In addition, ht-index cannot represent hierarchy clearly when data distribution does not fit a long-tail distribution exactly. However, the ht-index is the only method that can analyze the complexity of natural cities without using images.
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McBride, Melissa. « The study of responses mediated by α₂ and α₁-adrenoceptors in the tail and mesenteric resistance arteries from transgenic mice ». Thesis, University of Glasgow, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.400694.

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Livres sur le sujet "Frog with a tail"

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Commission, United States International Trade. Crawfish tail meat from China. Washington, DC : U.S. International Trade Commission, 1996.

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Smith, Lucy Sackett. Elephants : From trunk to tail. New York : PowerKids Press, 2010.

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Turtles from head to tail. New York, NY : Gareth Stevens, 2016.

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Hamsters from head to tail. New York, NY : Gareth Stevens, 2017.

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United States International Trade Commission. Crawfish tail meat from China. Washington, DC : U.S. International Trade Commission, 1997.

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Fish from head to tail. New York, NY : Gareth Stevens, 2017.

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ill, Moriya Kwanchai, dir. Bugs from head to tail. Toronto : Kids Can Press, 2017.

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Commission, United States International Trade. Crawfish tail meat from China. Washington, DC : U.S. International Trade Commission, 1996.

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United States International Trade Commission. Crawfish tail meat from China. Washington, DC : U.S. International Trade Commission, 1997.

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Lee, Wildish, dir. Nose to nose, tail to tail : Love poems from the animal kingdom. New York : Alfred A Knopf, 2010.

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Chapitres de livres sur le sujet "Frog with a tail"

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Bearce, Stephanie. « Tickling the Dragon's Tail ». Dans Twisted True Tales from Science Explosive Experiments, 67–72. New York : Routledge, 2021. http://dx.doi.org/10.4324/9781003239277-17.

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Doerr, Benjamin, et Leslie Ann Goldberg. « Drift Analysis with Tail Bounds ». Dans Parallel Problem Solving from Nature, PPSN XI, 174–83. Berlin, Heidelberg : Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-15844-5_18.

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Hansen, Nikolaus, Fabian Gemperle, Anne Auger et Petros Koumoutsakos. « When Do Heavy-Tail Distributions Help ? » Dans Parallel Problem Solving from Nature - PPSN IX, 62–71. Berlin, Heidelberg : Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11844297_7.

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Rittié, Laure. « Type I Collagen Purification from Rat Tail Tendons ». Dans Fibrosis, 287–308. New York, NY : Springer New York, 2017. http://dx.doi.org/10.1007/978-1-4939-7113-8_19.

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Zhu, Xiaoming, Bingying Song, Yingzi Ni, Yifan Ren et Rui Li. « The Long Tail Market—From Economies of Scale to Economies of Scale and the Long Tail Market ». Dans Business Trends in the Digital Era, 143–59. Singapore : Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-1079-8_8.

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Aleklett, Kjell. « Oil from Deep Water : The Tail End of Extraction ». Dans Peeking at Peak Oil, 149–68. New York, NY : Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-3424-5_12.

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Dong, Faqin, Yuan Tan, Wei Yang, Wei Zhang et Yuanyuan Zhou. « Bioleaching of Metals from Tail-Serpentine by Aspergillus niger ». Dans Proceedings of the 10th International Congress for Applied Mineralogy (ICAM), 145–52. Berlin, Heidelberg : Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27682-8_19.

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Nagarajan, Ramanathan. « Self-Assembly from Surfactants to Nanoparticles - Head vs. Tail ». Dans Self-Assembly, 1–40. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2018. http://dx.doi.org/10.1002/9781119001379.ch1.

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Liptser, Robert, et Alexander Novikov. « Tail Distributions of Supremum and Quadratic Variation of Local Martingales ». Dans From Stochastic Calculus to Mathematical Finance, 421–32. Berlin, Heidelberg : Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-30788-4_22.

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Masi, Andrea, Jeremy Benton et Paul G. Tucker. « CFD for Prediction of Flow Separation from Aircraft Tail Surfaces ». Dans Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 137–50. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-21127-5_8.

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Actes de conférences sur le sujet "Frog with a tail"

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Krishnan, Adit, Ashish Sharma et Hari Sundaram. « Insights from the Long-Tail ». Dans CIKM '18 : The 27th ACM International Conference on Information and Knowledge Management. New York, NY, USA : ACM, 2018. http://dx.doi.org/10.1145/3269206.3271706.

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Liu, Yujiong, et Pinhas Ben-Tzvi. « Design, Analysis, and Optimization of a New Two-DOF Articulated Multi-Link Robotic Tail ». Dans ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/detc2019-97537.

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Abstract Based on observations from nature, tails are believed to help animals achieve highly agile motions. Traditional single-link robotic tails serve as a good simplification for both modeling and implementation purposes. However, this approach cannot explain the complicated tail behaviors exhibited in nature where multi-link structures are more commonly observed. Unlike its single-link counterpart, articulated multi-link tails essentially belong to the serial manipulator family which possesses special transmission design challenges. To address this challenge, a cable driven hyper-redundant design becomes the most used approach. Limited by cable strength and elastic components, this approach suffers from low frequency responses, inadequate generated inertial loading, and fragile hardware, which are all critical drawbacks for robotic tails design. To solve these structure related shortcomings, a multi-link robotic tail made up of rigid links is proposed in this paper. The new structure takes advantage of the traditional hybrid mechanism architecture, but utilizes rigid mechanisms to couple the motions between ith link and i + 1th link rather than using cable actuation. By doing so, the overall tail becomes a rigid mechanism which achieves quasi-uniform spatial bending for each segment and allows performing highly dynamic motions. The mechanism and detailed design for this new tail are synthesized. The kinematic model was developed and an optimization process was conducted to minimize the bending non-uniformity for the rigid tail.
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E. Middleton, Stuart, Anita Lavorgna, Geoff Neumann et David Whitehead. « Information Extraction from the Long Tail ». Dans WebSci '20 : 12th ACM Conference on Web Science. New York, NY, USA : ACM, 2020. http://dx.doi.org/10.1145/3394332.3402838.

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Saab, Wael, et Pinhas Ben-Tzvi. « Maneuverability and Heading Control of a Quadruped Robot Utilizing Tail Dynamics ». Dans ASME 2017 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/dscc2017-5337.

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This paper presents modeling and analysis of a quadruped robot that utilizes tail dynamics to control its heading angle. The tail is envisioned to assist locomotion as a means separate from its legs to generate forces and moments to improve performance in terms maneuverability. Tail motion is analyzed for both low and high-speed tail actuation to derive sufficient conditions to maintain equilibrium and formulate maneuverability relations that result in rotation and translation of the robotic system. Sensitivity analysis is presented to select optimal tail mass and length ratios to maximize the change of the heading angle. A heading controller is then proposed and simulated to achieve a desired heading angle utilizing tail dynamics. Results of this research will assist in the design, modeling, and analysis of robotic systems sharing similar topologies to the proposed model, such as mobile robots with wheeled, tracked, multi-legged, or articulated-body based locomotion with swinging extremities such as tails, torsos, and limbs.
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Burton, David, Mehdi Nazarinia, John Sheridan et Derwin Parkin. « Optimisation of Boat-Tails for Heavy Vehicles ». Dans ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-23009.

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Boat-tails offer significant promise in reducing long haul heavy vehicle aerodynamic drag, and hence fuel consumption and greenhouse gas emissions. This paper presents results from a basic numerical and experimental investigation of drag coefficient reductions for various boat-tail configurations. The vehicle chosen is an arbitrary streamlined front end with a width to height ratio of 64%. No tractor to trailer gap is modeled. Approximate model scale is 12% and test Reynolds Number is ∼850,000. Experimental data and numerical simulations are presented for the zero yaw angle condition. For boat-tail angles where the flow remains largely attached a relationship is observed between drag reduction and the minimum boat-tail area. An optimum boat-tail angle (in the range of 15 degrees) is identified for 0 degrees yaw from both experimental and numerical data. For boat-tail angles greater than optimum a distinct increase in drag is observed in the experimental data, which is associated with flow separation. Comparison of experimental and numerical results show reasonable agreement for attached flow cases, and indicate a similar optimal boat-tail angle.
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VA, P. « ACQUIRING TAIL LOAD SPECTRA FROM IN-FLIGHT MEASUREMENTS ». Dans 34th Structures, Structural Dynamics and Materials Conference. Reston, Virigina : American Institute of Aeronautics and Astronautics, 1993. http://dx.doi.org/10.2514/6.1993-1607.

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Song, Yangqiu, Haixun Wang, Weizhu Chen et Shusen Wang. « Transfer Understanding from Head Queries to Tail Queries ». Dans CIKM '14 : 2014 ACM Conference on Information and Knowledge Management. New York, NY, USA : ACM, 2014. http://dx.doi.org/10.1145/2661829.2662078.

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Chen, Zhe, Michael Cafarella et H. V. Jagadish. « Long-tail Vocabulary Dictionary Extraction from the Web ». Dans WSDM 2016 : Ninth ACM International Conference on Web Search and Data Mining. New York, NY, USA : ACM, 2016. http://dx.doi.org/10.1145/2835776.2835778.

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Nowakowski, M., N. G. Kelkar, George Rupp, Eef van Beveren, Pedro Bicudo, Brigitte Hiller et Frieder Kleefeld. « Long Tail of Quantum Decay from Scattering Data ». Dans SCADRON70 : Workshop on Scalar Mesons and Related Topics Honoring Michael Scadron's 70th Birthday. AIP, 2008. http://dx.doi.org/10.1063/1.2973508.

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Haughn, Kevin P. T., Lawren L. Gamble et Daniel J. Inman. « Horizontal Planform Morphing Tail for an Avian Inspired UAV Using Shape Memory Alloys ». Dans ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/smasis2018-7986.

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Unlike most modern aircraft, which have a vertical tail component, birds fly utilizing a purely horizontal tail. In order to provide control normally associated with a vertical rudder, bird’s tails are incredibly mobile, twisting, pitching, and widening to perform necessary aerial maneuvers. This research primarily focuses on the development and testing of a mechanical planform morphing horizontal control surface, aiming to emulate the tail-spread control action of birds. This horizontal control surface is implemented on a small, tailless, avian inspired unmanned aerial vehicle (UAV). In this research, the horizontal control surface, made entirely of 3D printed material, comprises a rigid overlapping top layer held together by a soft and elastic honeycomb bottom layer, allowing for shape morphing without compromising structural integrity required to withstand aerodynamic forces. Using the relatively large strain and strength offered by shape memory alloy (SMA) springs, the 3D printed horizontal tail undergoes a notable and consistent geometric change. To quantify the system’s performance, the tail width and center was measured while actuating the springs through a range of frequencies from 0.01 to 10 Hz. Preliminary experiments were conducted in a 1ft. × 1 ft. open loop wind tunnel at the University of Michigan at wind speeds of 5, 10 and 15 m/s to quantify the effects of aerodynamic loading on actuation magnitude and speed.
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Rapports d'organisations sur le sujet "Frog with a tail"

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Birn, J., J. E. Borovsky, M. F. Thomsen, D. J. McComas, G. D. Reeves, R. D. Belian, M. Hesse et K. Schindler. Particle acceleration from reconnection in the geomagnetic tail. Office of Scientific and Technical Information (OSTI), août 1997. http://dx.doi.org/10.2172/522543.

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Jekel JR, Charles Fredrick Romero, Vicente J. Conservative Estimation of Tail Probabilities from Limited Sample Data. Office of Scientific and Technical Information (OSTI), mars 2020. http://dx.doi.org/10.2172/1605343.

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Nuttall, Albert H. Evaluation of Small Tail Probabilities Directly from the Characteristic Function. Fort Belvoir, VA : Defense Technical Information Center, septembre 1997. http://dx.doi.org/10.21236/ada330541.

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Rousseau, Thomas L. Cutting Teeth to Increase the Tail : The Elimination of Echo Companies from the Heavy Division. Fort Belvoir, VA : Defense Technical Information Center, décembre 1996. http://dx.doi.org/10.21236/ada324410.

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Pritchard, Joy, H. R. Whay et A. Brown. Tail/tail base lesions. Brooke, 2011. http://dx.doi.org/10.46746/gaw.2020.abi.les.tail.

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Brown, Ashleigh. Frog. Brooke, avril 2011. http://dx.doi.org/10.46746/gaw.2020.abi.frog.

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Grondin LeBlanc, P., P. Mercier-Langevin, M. Malo, O. Côté-Mantha, M. Simard, P. Barbe, M. Valette et S. De Souza. Structural controls on the nature and distribution of gold In polytectonized Precambrian volcano-sedimentary successions : an example from the Whale Tail Zone, Amaruq project, Nunavut. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2017. http://dx.doi.org/10.4095/300660.

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Brown, Ashleigh. Tail mutilation. Brooke, avril 2011. http://dx.doi.org/10.46746/gaw.2020.abi.mut.tail.

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Pritchard, Joy, H. R. Whay et A. Brown. Tail tuck. Brooke, 2004. http://dx.doi.org/10.46746/gaw.2020.abi.tailt.

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Kolwey, Herman. Tail Rotor Flapping. Fort Belvoir, VA : Defense Technical Information Center, septembre 1999. http://dx.doi.org/10.21236/ada375758.

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