Готові списки джерел за темами / Tail approach

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Добірка наукової літератури з теми "Tail approach"

Автор: Grafiati
Опубліковано: 10 березня 2023

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Статті в журналах з теми "Tail approach"

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Cai, Jun, and José Garrido. "A unified approach to the study of tail probabilities of compound distributions." Journal of Applied Probability 36, no. 4 (1999): 1058–73. http://dx.doi.org/10.1239/jap/1032374755.

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We consider the tail probabilities of a class of compound distributions. First, the relations between reliability distribution classes and heavy-tailed distributions are discussed. These relations reveal that many previous results on estimating the tail probabilities are not applicable to heavy-tailed distributions.Then, a generalized Wald's identity and identities for compound geometric distributions are presented in terms of renewal processes. Using these identities, lower and upper bounds for the tail probabilities are derived in a unified way for the class of compound distributions, both under the conditions of NBU and NWU tails, which include exponential tails, as well as under the condition of heavy-tailed distributions.Finally, simplified bounds are derived by the technique of stochastic ordering. This method removes some unnecessary technical assumptions and corrects errors in the proof of some previous results.
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2

Cai, Jun, and José Garrido. "A unified approach to the study of tail probabilities of compound distributions." Journal of Applied Probability 36, no. 04 (1999): 1058–73. http://dx.doi.org/10.1017/s0021900200017861.

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Анотація:
We consider the tail probabilities of a class of compound distributions. First, the relations between reliability distribution classes and heavy-tailed distributions are discussed. These relations reveal that many previous results on estimating the tail probabilities are not applicable to heavy-tailed distributions. Then, a generalized Wald's identity and identities for compound geometric distributions are presented in terms of renewal processes. Using these identities, lower and upper bounds for the tail probabilities are derived in a unified way for the class of compound distributions, both under the conditions of NBU and NWU tails, which include exponential tails, as well as under the condition of heavy-tailed distributions. Finally, simplified bounds are derived by the technique of stochastic ordering. This method removes some unnecessary technical assumptions and corrects errors in the proof of some previous results.
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3

Schwaner, M. J., S. T. Hsieh, I. Braasch, et al. "Future Tail Tales: A Forward-Looking, Integrative Perspective on Tail Research." Integrative and Comparative Biology 61, no. 2 (2021): 521–37. http://dx.doi.org/10.1093/icb/icab082.

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Abstract Synopsis Tails are a defining characteristic of chordates and show enormous diversity in function and shape. Although chordate tails share a common evolutionary and genetic-developmental origin, tails are extremely versatile in morphology and function. For example, tails can be short or long, thin or thick, and feathered or spiked, and they can be used for propulsion, communication, or balancing, and they mediate in predator–prey outcomes. Depending on the species of animal the tail is attached to, it can have extraordinarily multi-functional purposes. Despite its morphological diversity and broad functional roles, tails have not received similar scientific attention as, for example, the paired appendages such as legs or fins. This forward-looking review article is a first step toward interdisciplinary scientific synthesis in tail research. We discuss the importance of tail research in relation to five topics: (1) evolution and development, (2) regeneration, (3) functional morphology, (4) sensorimotor control, and (5) computational and physical models. Within each of these areas, we highlight areas of research and combinations of long-standing and new experimental approaches to move the field of tail research forward. To best advance a holistic understanding of tail evolution and function, it is imperative to embrace an interdisciplinary approach, re-integrating traditionally siloed fields around discussions on tail-related research.
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4

Zhou, Chen. "Risk Theory: A Heavy Tail Approach." Journal of the American Statistical Association 114, no. 527 (2019): 1424–25. http://dx.doi.org/10.1080/01621459.2019.1662244.

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5

Liu, Yaolong, and Tianhong Jiang. "Conceptual Aircraft Empennage Design Based on Multidisciplinary Design Optimization Approach." International Journal of Aerospace Engineering 2022 (October 18, 2022): 1–9. http://dx.doi.org/10.1155/2022/9288966.

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Within a conventional aircraft design process, the horizontal tail and vertical tail are generally sized via volume coefficient methods. In this manuscript, an improved method for conceptual aircraft tail design based on multidisciplinary design optimization (MDO) approach with stability and control constraints has been developed. To develop this method, first, the tail design requirements have been derived from the regulations and the fundamental functionalities of tail plans. Then, the empennage design is formulated as an MDO problem. Eventually the design optimization of horizontal and vertical tail is combined with the design optimization of the aircraft wing. A test case is presented for concurrent wing and tail plane design, which resulted in more than 9% reduction in aircraft block fuel weight and more than 3% reduction in aircraft maximal takeoff weight, which indicates a great potential for fuel burn and carbon reductions with empennage design optimization at conceptual aircraft design phase.
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6

Abraham, Deepak, Jinu Kurian Thomas, Philip Joseph, and MJ Paul. "Lateral Laparoscopic Approach to Pancreatic Tail Insulinomas." World Journal of Endocrine Surgery 4, no. 1 (2012): 3–7. http://dx.doi.org/10.5005/jp-journals-10002-1082.

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ABSTRACT Pancreatic endocrine tumors are relatively rare lesions and laparoscopic surgery is being increasingly used, especially for insulinomas because of their relatively small size and low incidence of malignancy. Laparoscopic approach to pancreatic tumors has been described in the supine position, transomentally via the lesser sac with anterior stomach retraction. We propose a simplified lateral laparoscopic approach to insulinomas localized preoperatively to the tail or distal body of pancreas. Four patients with pancreatic tail insulinomas underwent laparoscopic surgery between November 2006 and February 2008. Diagnosis was confirmed by fasting sugar, insulin and proinsulin assays. Lesions were localized by multiphasic CT scan/MRI scan and endoscopic ultrasound. All these cases had definitely identifiable enhancing lesions in the distal body/tail in relation to the splenic hilum that appeared accessible by a lateral approach. Except for the first case which was done through the traditional supine approach, the other cases were done by the lateral approach. The patients were positioned right lateral with a kidney bridge. Four subcostal ports were placed and the left colon and spleen with pancreatic tail were mobilised in the same fashion as for splenectomy or adrenalectomy. Tumors were easily identifiable corresponding to the imaging studies. Laparoscopic enucleation was successfully completed in all four patients with lesions in the tail of pancreas, one by the traditional approach and other three by the proposed lateral approach. One patient had associated splenectomy because of the proximity of the lesion to the splenic vessels. Two patients had minor pancreatic leak managed conservatively. The left lateral transperitoneal laparoscopic approach to insulinomas located in the tail of pancreas is feasible and safe. The procedure can be done with ease by surgeons who are familiar with adrenalectomy and splenectomy. How to cite this article Thomas JK, Abraham D, Joseph P, Paul MJ. Lateral Laparoscopic Approach to Pancreatic Tail Insulinomas. World J Endocr Surg 2012;4(1):3-7.
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7

Servin-Aguilar, Jesus G., Luis Rizo-Dominguez, Jorge A. Pardinas-Mir, Cesar Vargas-Rosales, and Ivan Padilla-Cantoya. "Epilepsy Seizure Detection: A Heavy Tail Approach." IEEE Access 8 (2020): 208170–78. http://dx.doi.org/10.1109/access.2020.3038397.

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8

Asimit, Alexandru V., and Jinzhu Li. "Measuring the tail risk: An asymptotic approach." Journal of Mathematical Analysis and Applications 463, no. 1 (2018): 176–97. http://dx.doi.org/10.1016/j.jmaa.2018.03.019.

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9

Leijen, Daan, and Anton Lorenzen. "Tail Recursion Modulo Context: An Equational Approach." Proceedings of the ACM on Programming Languages 7, POPL (2023): 1152–81. http://dx.doi.org/10.1145/3571233.

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The tail-recursion modulo cons transformation can rewrite functions that are not quite tail-recursive into a tail-recursive form that can be executed efficiently. In this article we generalize tail recursion modulo cons (TRMc) to modulo contexts (TRMC), and calculate a general TRMC algorithm from its specification. We can instantiate our general algorithm by providing an implementation of application and composition on abstract contexts, and showing that our context laws_ hold. We provide some known instantiations of TRMC, namely modulo evaluation contexts (CPS), and associative operations , and further instantiantions not so commonly associated with TRMC, such as defunctionalized evaluation contexts, monoids , semirings , exponents , and cons products . We study the modulo cons instantiation in particular and prove that an instantiation using Minamide’s hole calculus is sound. We also calculate a second instantiation in terms of the Perceus heap semantics to precisely reason about the soundness of in-place update. While all previous approaches to TRMc fail in the presence of non-linear control (for example induced by call/cc, shift/reset or algebraic effect handlers), we can elegantly extend the heap semantics to a hybrid approach which dynamically adapts to non-linear control flow. We have a full implementation of hybrid TRMc in the Koka language and our benchmark shows the TRMc transformed functions are always as fast or faster than using manual alternatives.
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10

Schäfer, Dominik. "T-tail flutter simulations with regard to quadratic mode shape components." CEAS Aeronautical Journal 12, no. 3 (2021): 621–32. http://dx.doi.org/10.1007/s13272-021-00524-8.

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AbstractIt is known that the dynamic aeroelastic stability of T-tails is dependent on the steady aerodynamic forces at aircraft trim condition. Accounting for this dependency in the flutter solution process involves correction methods for doublet lattice method (DLM) unsteady aerodynamics, enhanced DLM algorithms, unsteady vortex lattice methods (UVLM), or the use of CFD. However, the aerodynamic improvements along with a commonly applied modal approach with linear displacements results in spurious stiffness terms, which distort the flutter velocity prediction. Hence, a higher order structural approach with quadratic mode shape components is required for accurate flutter velocity prediction of T-tails. For the study of the effects of quadratic mode shape components on T-tail flutter, a generic tail configuration without sweep and taper is used. Euler based CFD simulations are applied involving a linearized frequency domain (LFD) approach to determine the generalized aerodynamic forces. These forces are obtained based on steady CFD computations at varying horizontal tail plane (HTP) incidence angles. The quadratic mode shape components of the fundamental structural modes for the vertical tail plane (VTP), i.e., out-of-plane bending and torsion, are received from nonlinear as well as linear finite element analyses. Modal coupling resulting solely from the extended modal representation of the structure and its influence on T-tail flutter is studied. The g-method is applied to solve for the flutter velocities and corresponding flutter mode shapes. The impact of the quadratic mode shape components is visualized in terms of flutter velocities in dependency of the HTP incidence angle and the static aerodynamic HTP loading.
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Дисертації з теми "Tail approach"

1

Nilsson, Mattias. "Tail Estimation for Large Insurance Claims, an Extreme Value Approach." Thesis, Linnaeus University, School of Computer Science, Physics and Mathematics, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-7826.

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<p>In this thesis are extreme value theory used to estimate the probability that large insuranceclaims are exceeding a certain threshold. The expected claim size, given that the claimhas exceeded a certain limit, are also estimated. Two different models are used for thispurpose. The first model is based on maximum domain of attraction conditions. A Paretodistribution is used in the other model. Different graphical tools are used to check thevalidity for both models. Länsförsäkring Kronoberg has provided us with insurance datato perform the study.Conclusions, which have been drawn, are that both models seem to be valid and theresults from both models are essential equal.</p><br><p>I detta arbete används extremvärdesteori för att uppskatta sannolikheten att stora försäkringsskadoröverträffar en vis nivå. Även den förväntade storleken på skadan, givetatt skadan överstiger ett visst belopp, uppskattas. Två olika modeller används. Den förstamodellen bygger på antagandet att underliggande slumpvariabler tillhör maximat aven extremvärdesfördelning. I den andra modellen används en Pareto fördelning. Olikagrafiska verktyg används för att besluta om modellernas giltighet. För att kunna genomförastudien har Länsförsäkring Kronoberg ställt upp med försäkringsdata.Slutsatser som dras är att båda modellerna verkar vara giltiga och att resultaten ärlikvärdiga.</p>
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2

Mccart, James A. "Goal Attainment On Long Tail Web Sites: An Information Foraging Approach." Scholar Commons, 2009. http://scholarcommons.usf.edu/etd/3686.

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This dissertation sought to explain goal achievement at limited traffic “long tail” Web sites using Information Foraging Theory (IFT). The central thesis of IFT is that individuals are driven by a metaphorical sense of smell that guides them through patches of information in their environment. An information patch is an area of the search environment with similar information. Information scent is the driving force behind why a person makes a navigational selection amongst a group of competing options. As foragers are assumed to be rational, scent is a mechanism by which to reduce search costs by increasing the accuracy on which option leads to the information of value. IFT was originally developed to be used in a “production rule” environment, where a user would perform an action when the conditions of a rule were met. However, the use of IFT in clickstream research required conceptualizing the ideas of information scent and patches in a non-production rule environment. To meet such an end this dissertation asked three research questions regarding (1) how to learn information patches, (2) how to learn trails of scent, and finally (3) how to combine both concepts to create a Clickstream Model of Information Foraging (CMIF). The learning of patches and trails were accomplished by using contrast sets, which distinguished between individuals who achieved a goal or not. A user- and site-centric version of the CMIF, which extended and operationalized IFT, presented and evaluated hypotheses. The user-centric version had four hypotheses and examined product purchasing behavior from panel data, whereas the site-centric version had nine hypotheses and predicted contact form submission using data from a Web hosting company. In general, the results show that patches and trails exist on several Web sites, and the majority of hypotheses were supported in each version of the CMIF. This dissertation contributed to the literature by providing a theoretically-grounded model which tested and extended IFT; introducing a methodology for learning patches and trails; detailing a methodology for preprocessing clickstream data for long tail Web sites; and focusing on traditionally under-studied long tail Web sites.
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3

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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Submitted by Laura Simonsen Leal (arula@fgvmail.br) on 2016-06-22T12:59:34Z No. of bitstreams: 1 laura_tese14(final).pdf: 1036208 bytes, checksum: eac8007047195b00593f30884e72a3e2 (MD5)<br>Approved for entry into archive by GILSON ROCHA MIRANDA (gilson.miranda@fgv.br) on 2016-06-22T13:18:16Z (GMT) No. of bitstreams: 1 laura_tese14(final).pdf: 1036208 bytes, checksum: eac8007047195b00593f30884e72a3e2 (MD5)<br>Approved for entry into archive by Marcia Bacha (marcia.bacha@fgv.br) on 2016-06-29T13:38:50Z (GMT) No. of bitstreams: 1 laura_tese14(final).pdf: 1036208 bytes, checksum: eac8007047195b00593f30884e72a3e2 (MD5)<br>Made available in DSpace on 2016-06-29T13:39:56Z (GMT). No. of bitstreams: 1 laura_tese14(final).pdf: 1036208 bytes, checksum: eac8007047195b00593f30884e72a3e2 (MD5) Previous issue date: 2016-03-21<br>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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4

Boyer, de la Giroday Elsa, and David Stenvall. "Green Investments Under Uncertainty : - A cross-quantilogram approach." Thesis, Linköpings universitet, Nationalekonomi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-158100.

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In this study, we analyze the quantile dependence for green bond returns and renewable energy stock returns with three major asset classes: corporate bonds, stocks and oil. Furthermore, we control the dependence structure for technology, uncertainties as well as lag structures and time-varying effects. We apply the cross-quantilogram developed by Han et al. (2016) that allows us to study the dependence structures between two time series in arbitrary quantiles. The results led us to three key findings: 1) The returns of thegreen bond market are tail-dependent on the returns of both long and short-term maturities for the corporate bond market but are not dependent on the stock market nor the oil market. The tail-dependence indicates that while investors may hold green bonds due to moral incentives, it is not enough during times of turbulence. Further, the dependence structures are short-lived. 2)The renewable energy market is dependent on oil returns of similar quantiles, suggesting that renewable energy substitutes oil when oil prices increase. However, renewable energy does not influence the oil market, indicating that oil is not a substitutional energy source for renewable energy driven firms. Renewable energy stocks are further highly dependent on the returns of the general stock market but are not influenced by the returns on the corporate bond market. 3) The dependence of both renewable energy and green bonds with the asset markets are time-varying. Our overall results obtained by this paper provides information that could help facilitate new investment allocations towards green investments. Further, the results may have immediate and important implications for investors. For those in the corporate bond market, adding green bonds does not add diversification benefits during turbulence. Similarly, renewable energy stock does not add diversification benefits to investors in the oil or stock market.
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5

Borg, Elin, and Ilya Kits. "Dependence Structures between Commodity Futures and Corresponding Producer Indices across Varying Market Conditions : A cross-quantilogram approach." Thesis, Linköpings universitet, Nationalekonomi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-166940.

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This thesis examines the dependence structures between commodity futures and corresponding commodity producer equity indices in bearish, bullish and normal market conditions. We study commodity futures and producer indices in the energy, precious metals, gold and agriculture commodity markets using daily return data that ranges from 16 December 2005 to 28 June 2019. We employ the cross-quantilogram approach developed by Han et al. (2016) to examine dependence structures in the full quantile range, which represents different market states. Furthermore, we control for different lag structures, uncertainties and time-varying dependence structures. From our results we conclude the following: 1) There are time-varying asymmetric and symmetric dependencies in different commodity markets. There is asymmetric dependence between commodity futures and producer indices in the precious metals, gold and agricultural markets. In the oil market, the relationship is symmetrical. No relationship is found in the natural gas market. 2) Heterogenous dependence structures are identified in the gold, precious metals and agricultural commodity markets. The oil market uncovers homogenous dependence structures. 3) The observed spillover in all markets occur in the very short run, at one day, and dissipates after a week and additionally after a month. Our results provide new information regarding commodity diversification attributes which can be useful to investors. Our results also provide important policy implications: Since volatility spillovers between commodity futures and producer indices may deter investors from including commodities in their portfolios, as they might lose their diversifier qualities, it is important to enforce policies that will prevent the spillovers between the assets. Further, regulations of the commodity futures markets could be an alternative to reduce the spillovers.
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6

Kernel, Philippe. "High current single bunch transverse instabilities in storage ring light sources : a new approach highlighting a post-head-tail mechanism : application to the ESRF." Université Joseph Fourier (Grenoble), 2000. http://www.theses.fr/2000GRE10160.

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Les instabilites transverses sont le principal obstacle a l'augmentation du seuil de courant, en mode mono-paquet, dans les sources de rayonnement synchrotron. A partir de mesures, de simulations et de la base theorique preexistante, une interpretation de ces mecanismes d'instabilites est presentee. Au-dela de l'instabilite habituelle de couplage de modes et des modes "tete-queue" decouples, qui ont ete observes a l'esrf, une nouvelle forme d'instabilite, l'instabilite "post-synchrotronique", est caracterisee. Une theorie expliquant cette instabilite post-synchrotronique est developpee. Cette theorie est consistente avec les mesures effectuees a l'esrf.
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7

Stephens, Nathan Wallace. "A Comparison of Microarray Analyses: A Mixed Models Approach Versus the Significance Analysis of Microarrays." BYU ScholarsArchive, 2006. https://scholarsarchive.byu.edu/etd/1115.

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DNA microarrays are a relatively new technology for assessing the expression levels of thousands of genes simultaneously. Researchers hope to find genes that are differentially expressed by hybridizing cDNA from known treatment sources with various genes spotted on the microarrays. The large number of tests involved in analyzing microarrays has raised new questions in multiple testing. Several approaches for identifying differentially expressed genes have been proposed. This paper considers two: (1) a mixed models approach, and (2) the Signiffcance Analysis of Microarrays.
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8

Oliveau, Sébastien. "Periurbanisation in Tamil Nadu : a quantitative approach /." New Delhi : Centre de sciences humaines, 2005. http://catalogue.bnf.fr/ark:/12148/cb40975054m.

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Texte remanié de: Doctoral tesis--Geography--University of Paris I Panthéon-Sorbonne, 2004.<br>Publ. à l'issue d'un congrès international : "Peri-urban dynamics : population, habitat and environment on the peripheries of large Indian metropolises" tenu à New Delhi en août 2004. Bibliogr. p. 83-90.
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9

Coleman, Keith LaMar. "Building optimization : an integrated approach to the design of tall buildings." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/38942.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2007.<br>Includes bibliographical references (p. 73-75).<br>There has been much research done on building optimization that deal with the issues within specific individual fields, such as architecture, structural engineering, and construction engineering. However, in practical application these issues must be addressed in a much more holistic manner as building design is becoming much more inclusive. A balance must be made that addresses the constructability and scheduling concerns of the contractor, the enclosure and spatial concerns of the architect, and finally the load-carrying concerns of the structural engineer. What if these issues were considered altogether and integrated more fully into building optimization? These issues and concerns would indubitably result in compromise solutions and tradeoffs that would have to be taken into account. This research will not only investigate and utilize current optimization techniques for the conceptual design of tall buildings, but also introduce a new metric in the dynamic analysis of high rise structures.<br>by Keith L. Coleman.<br>M.Eng.
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Law, Joyce Hor Yan. "Towards bioclimatic high-rise buildings : is a bioclimatic design approach appropriate for improving environmental performance of high-rise buildings? /." [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18966.pdf.

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Книги з теми "Tail approach"

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McCracken, Robert A. Reading is only the tiger's tail: A language arts program. Peguis Publishers, 1987.

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2

E, Summers Jane, ed. Tails, wings, & other things. Perfection Form Co., 1990.

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3

Simiu, Emil. Extreme wind distribution tails: A 'peaks over threshold' approach. U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1995.

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4

1926-, Krishnamurthy N. D., Sadasivam M. 1936-, and NDK Institute of Languages (Bangalore, India), eds. Conversational Tamil: A microwave approach. NDK Institute of Languages, 1999.

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5

Phillips, Tunick Betty, Roger Tory Peterson Institute, and Pacific Oaks College, eds. Snail trails and tadpole tails: Nature education guide for young children. Redleaf Press, 1993.

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6

Greene, Judith. Language understanding: A cognitive approach. Open University Press, 1986.

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7

Greene, Judith. Language understanding: A cognitive approach. Open University Press, 1985.

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8

Katherine, Dreyer, ed. ChiRunning: A revolutionary approach to effortless, injury-free running. Simon & Schuster, 2004.

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Katherine, Dreyer, ed. ChiRunning: A revolutionary approach to effortless, injury-free running. Simon & Schuster, 2009.

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10

The complete illustrated guide to tai chi: A step-by-step approach to the ancient Chinese movement. Metro Books, 2010.

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Частини книг з теми "Tail approach"

1

Bozzi, Carolina, Marco Neves, and Claudia Mont’Alvão. "An Exploratory Approach Towards Fashion E-tail." In Human Interaction, Emerging Technologies and Future Applications III. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-55307-4_8.

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Falco, Mathea, Jesse Schell, and Deidre Witan. "Tunnel Tail: A New Approach to Prevention." In Games for Health 2014. Springer Fachmedien Wiesbaden, 2014. http://dx.doi.org/10.1007/978-3-658-07141-7_5.

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Ma, Lingjie. "Quantitative Investing with Tail Behavior—A Distributional Approach." In Quantitative Investing. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-47202-3_8.

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Cohen, Aviad, Yuri Rabinovich, Assaf Schuster, and Hadas Shachnai. "Optimal bounds on tail probabilities — a simplified approach." In Lecture Notes in Computer Science. Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/3-540-64359-1_705.

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Budhiraja, Amar, and P. Krishna Reddy. "An Improved Approach for Long Tail Advertising in Sponsored Search." In Database Systems for Advanced Applications. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55699-4_11.

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Cohen, Aviad, Yuri Rabinovich, Assaf Schuster, and Hadas Shachnai. "Optimal Bounds on Tail Probabilities: A Study of an Approach." In Combinatorial Optimization. Springer US, 1999. http://dx.doi.org/10.1007/978-1-4613-3282-4_1.

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Cao, Son Thanh, and Linh Anh Nguyen. "An Empirical Approach to Query-Subquery Nets with Tail-Recursion Elimination." In Advances in Intelligent Systems and Computing. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-10518-5_9.

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Alshammari, Gharbi, Jose L. Jorro-Aragoneses, Stelios Kapetanakis, Nikolaos Polatidis, and Miltos Petridis. "A Switching Approach that Improves Prediction Accuracy for Long Tail Recommendations." In Advances in Intelligent Systems and Computing. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-29516-5_3.

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Zelenyi, Lev M., Alexander V. Milovanov, and Gaetano Zimbardo. "Multiscale Magnetic Structure of the Distant Tail: Self-Consistent Fractal Approach." In New Perspectives on the Earth's Magnetotail. American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm105p0321.

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Alshammari, Gharbi, Jose L. Jorro-Aragoneses, Stelios Kapetanakis, Miltos Petridis, Juan A. Recio-García, and Belén Díaz-Agudo. "A Hybrid CBR Approach for the Long Tail Problem in Recommender Systems." In Case-Based Reasoning Research and Development. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-61030-6_3.

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Тези доповідей конференцій з теми "Tail approach"

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De Sousa Silva, Diogo Vinícius, and Frederico Araújo Durão. "A Hybrid Approach to Recommend Long Tail Items." In XXIV Simpósio Brasileiro de Sistemas Multimídia e Web. Sociedade Brasileira de Computação - SBC, 2018. http://dx.doi.org/10.5753/webmedia.2018.4550.

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Techniques in recommendation systems generally focuses on recommending the most important items for a user. The purpose of this work is to generate recommendations focusing on long tail items, and then to conduct the user to less popular items. However, such items are of great relevance to the user. Two techniques from the literature were applied in this study in a hybrid way. The first technique is through markov chains to calculate node similarity of a user item graph. The second technique applies clustering, where items are separated into distinct clusters: popular items (short tail) and non-popular items (long tail). Using the Movielens 100k database, we conducted an experiment to calculate the accuracy, diversity, and popularity of the recommended items. With our hybrid approach we were able to improve the recall by up to 27.97 % when compared to the markov chain-based algorithm, which indicates greater targeting to long tail products. At the same time the recommended items were more diversified and less popular, which indicates greater targeting to long tail products.
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Liu, Yujiong, and Pinhas Ben-Tzvi. "Design, Analysis, and Optimization of a New Two-DOF Articulated Multi-Link Robotic Tail." In 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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Wei, Tong, Wei-Wei Tu, and Yu-Feng Li. "Learning for Tail Label Data: A Label-Specific Feature Approach." In Twenty-Eighth International Joint Conference on Artificial Intelligence {IJCAI-19}. International Joint Conferences on Artificial Intelligence Organization, 2019. http://dx.doi.org/10.24963/ijcai.2019/533.

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Tail label data (TLD) is prevalent in real-world tasks, and large-scale multi-label learning (LMLL) is its major learning scheme. Previous LMLL studies typically need to additionally take into account extensive head label data (HLD), and thus fail to guide the learning behavior of TLD. In many applications such as recommender systems, however, the prediction of tail label is very necessary, since it provides very important supplementary information. We call this kind of problem as \emph{tail label learning}. In this paper, we propose a novel method for the tail label learning problem. Based on the observation that the raw feature representation in LMLL data usually benefits HLD, which may not be suitable for TLD, we construct effective and rich label-specific features through exploring labeled data distribution and leveraging label correlations. Specifically, we employ clustering analysis to explore discriminative features for each tail label replacing the original high-dimensional and sparse features. In addition, due to the scarcity of positive examples of TLD, we encode knowledge from HLD by exploiting label correlations to enhance the label-specific features. Experimental results verify the superiority of the proposed method in terms of performance on TLD.
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Reddy, P. Anantha, Sean T. Jones, Anita H. Lewin, Hernán A. Navarro, and F. Ivy Carroll. "An Improved Synthetic Approach to Head-to-Tail Cyclic Tetrapeptides." In The Twenty-Third American and the Sixth International Peptide Symposium. Prompt Scientific Publishing, 2013. http://dx.doi.org/10.17952/23aps.2013.240.

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Echaust, Krzysztof. "CONDITIONAL VAR USING GARCH-EVT APPROACH WITH OPTIMAL TAIL SELECTION." In 10th Economics & Finance Conference, Rome. International Institute of Social and Economic Sciences, 2018. http://dx.doi.org/10.20472/efc.2018.010.008.

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Serlin, Zachary, Jason Rife, and Michael Levin. "A Level Set Approach to Simulating Xenopus laevis Tail Regeneration." In Proceedings of the Artificial Life Conference 2016. MIT Press, 2016. http://dx.doi.org/10.7551/978-0-262-33936-0-ch085.

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Tashmatova, Chinara, and Mehdi Nazarinia. "Effect of Truck-Trailer Gap on Boat-Tail Performance of a Heavy Vehicle: A Numerical Approach." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66857.

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This paper presents results obtained from a numerical investigation of various configurations of gap clearances for a truck model equipped with boat-tails. ANSYS FLUENT V14.5 was used to examine the flow around the vehicle and to obtain the drag coefficient reductions at a range of yaw angles of 0° to 20°. The vehicle had a streamlined front end and was scaled to 12% of a full size truck with no tractor-trailer gap modeled. The computational domain was calculated at Reynolds number of approximately 8 × 105. The numerical data obtained from the investigation yielded a best configuration of the boat-tail which produced maximum of 10% drag reduction at 0° yaw angle when compared to the baseline model. The optimum boat-tail angles are also determined to be in the range of 15° to 20° for both 0° and 10° yaw angles.
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Koch, Nicolas T. "Tail events: A new approach to understanding extreme energy commodity prices." In 2013 10th International Conference on the European Energy Market (EEM 2013). IEEE, 2013. http://dx.doi.org/10.1109/eem.2013.6607357.

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"A STATISTICAL BASED APPROACH FOR REMOVING HEAVY TAIL NOISE FROM IMAGES." In International Conference on Computer Vision Theory and Applications. SciTePress - Science and and Technology Publications, 2006. http://dx.doi.org/10.5220/0001371901570161.

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Fahmy, Ghazal A. "A 6.25GHz, 2.7μw at 0.5V, double-tail comparator using charge-steering approach". У 2018 35th National Radio Science Conference (NRSC). IEEE, 2018. http://dx.doi.org/10.1109/nrsc.2018.8354398.

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Звіти організацій з теми "Tail approach"

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Grimshaw, Scott D. A Unified Approach to Estimating Tail Behavior. Defense Technical Information Center, 1989. http://dx.doi.org/10.21236/ada210961.

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Corscadden, Louise, and Arpaporn Sutipatanasomboon. Rodent Tagging And Identification. ConductScience, 2023. http://dx.doi.org/10.55157/cs20230109.

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Animal tagging is a means to identify and distinguish all the individual animals of interest, which applies to wildlife, farm, or laboratory animals. It involves attaching a tag to a specific animal part that contains a unique identifier for each animal. The identifier can be numbers, alphabets, or a combination of both that distinguish and track the animals throughout their lifespans. In rodents, tagging is the most popular identification approach. Typically, tags are made from metals and attached to the outer part of rodent ears, or the ear pinna. In rare circumstances, metal tags can also be attached to the rodent’s leg or tail.
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Elroy-Stein, Orna, and Dmitry Belostotsky. Mechanism of Internal Initiation of Translation in Plants. United States Department of Agriculture, 2010. http://dx.doi.org/10.32747/2010.7696518.bard.

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Original objectives Elucidation of PABP's role in crTMV148 IRES function in-vitro using wheat germ extract and krebs-2 cells extract. Fully achieved. Elucidation of PABP's role in crTMV148 IRES function in-vivo in Arabidopsis. Characterization of the physical interactions of PABP and other potential ITAFs with crTMV148 IRES. Partly achieved. To conduct search for additional ITAFs using different approaches and evaluate the candidates. Partly achieved. Background of the topic The power of internal translation via the activity of internal ribosomal entry site (IRES) elements allow coordinated synthesis of multiple gene products from a single transcription unit, and thereby enables to bypass the need for sequential transformation with multiple independent transgenes. The key goal of this project was to identify and analyze the IRES-trans-acting factors (ITAFs) that mediate the activity of a crucifer-infecting tobamovirus (crTMV148) IRES. The remarkable conservation of the IRES activity across the phylogenetic spectrum (yeast, plants and animals) strongly suggests that key ITAFs that mediate its activity are themselves highly conserved. Thus, crTMV148 IRES offers opportunity for elucidation of the fundamental mechanisms underlying internal translation in higher plants in order to enable its rational manipulation for the purpose of agricultural biotechnology. Major conclusions and achievements. - CrTMV IRES requires PABP for maximal activity. This conclusion was achieved by PABP depletion and reconstitution of wheat germ- and Krebs2-derived in-vitro translation assays using Arabidopsis-derived PABP2, 3, 5, 8 and yeast Pab1p. - Mutations in the internal polypurine tract of the IRES decrease the high-affinity binding of all phylogenetically divergent PABPs derived from Arabidopsis and yeast in electro mobility gel shift assays. - Mutations in the internal polypurine tract decrease IRES activity in-vivo. - The 3'-poly(A) tail enhances crTMV148 IRES activity more efficiently in the absence of 5'-methylated cap. - In-vivo assembled RNPs containing proteins specifically associated with the IRES were purified from HEK293 cells using the RNA Affinity in Tandem (RAT) approach followed by their identification by mass spectroscopy. - This study yielded a list of potential protein candidates that may serve as ITAFs of crTMV148 IRES activity, among them are a/b tubulin, a/g actin, GAPDH, enolase 1, ribonuclease/angiogenin inhibitor 1, 26S proteasome subunit p45, rpSA, eEF1Bδ, and proteasome b5 subunit. Implications, both scientific and agriculture. The fact that the 3'-poly(A) tail enhances crTMV148 IRES activity more efficiently in the absence of 5'-methylated cap suggests a potential joint interaction between PABP, the IRES sequence and the 3'-poly(A). This has an important scientific implication related to IRES function in general.
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Cannon, Mariah, and Pauline Oosterhoff. Tired and Trapped: Life Stories from Cotton Millworkers in Tamil Nadu. Institute of Development Studies, 2021. http://dx.doi.org/10.19088/clarissa.2021.002.

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Labour abuse in the garment industry has been widely reported. This qualitative research explores the lived experiences in communities with bonded labour in Tamil Nadu, India. We conducted a qualitative expert-led analysis of 301 life stories of mostly women and girls. We also explore the differences and similarities between qualitative expert-led and participatory narrative analyses of life stories of people living near to and working in the spinning mills. Our findings show that the young female workforce, many of whom entered the workforce as children, are seen and treated as belonging – body, mind and soul – to others. Their stories confirm the need for a feminist approach to gender, race, caste and work that recognises the complexity of power. Oppression and domination have material, psychological and emotional forms that go far beyond the mill. Almost all the girls reported physical and psychological exhaustion from gendered unpaid domestic work, underpaid hazardous labour, little sleep, poor nutrition and being in unhealthy environments.
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Arora, Saurabh, Arora, Saurabh, Ajit Menon, M. Vijayabaskar, Divya Sharma, and V. Gajendran. People’s Relational Agency in Confronting Exclusion in Rural South India. Institute of Development Studies (IDS), 2021. http://dx.doi.org/10.19088/steps.2021.004.

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Social exclusion is considered critical for understanding poverty, livelihoods, inequality and political participation in rural India. Studies show how exclusion is produced through relations of power associated with gender, caste, religion and ethnicity. Studies also document how people confront their exclusion. We use insights from these studies – alongside science and technology studies – and rely on life history narratives of ‘excluded’ people from rural Tamil Nadu, to develop a new approach to agency as constituted by two contrasting ways of relating: control and care. These ways of relating are at once social and material. They entangle humans with each other and with material worlds of nature and technology, while being mediated by structures such as social norms and cultural values. Relations of control play a central role in constituting exclusionary forms of agency. In contrast, relations of care are central to the agency of resistance against exclusion and of livelihood-building by the ‘excluded’. Relations can be transformed through agency in uncertain ways that are highly sensitive to trans-local contexts. We offer examples of policy-relevant questions that our approach can help to address for apprehending social exclusion in rural India and elsewhere.
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Harriss-White, Barbara. The Green Revolution and Poverty in Northern Tamil Nadu: a Brief Synthesis of Village-Level Research in the Last Half-Century. Institute of Development Studies (IDS), 2020. http://dx.doi.org/10.19088/steps.2020.001.

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Between 1972 and 2014, in Northern Tamil Nadu (NTN), India, the Green Revolution (GR) in agriculture was studied through five rounds of village-level studies (VLS). Over the decades, the number of villages dwindled; from 11, rigorously and randomly selected (together with a ‘Slater’ village first studied in 1916), through to a set of three villages in a rural–urban complex around a market town, to one of the original eleven, in the fifth round. During the reorganisation of districts in 1989, the villages sited on the Coromandel plain shifted administratively from North Arcot, a vanguard GR district, to Tiruvannamalai, described then as relatively backward. A wide range of concepts, disciplines, scales, field methods and analytical approaches were deployed to address i) a common core of questions about the economic and social implications of technological change in agriculture and ii) sets of other timely questions about rural development, which changed as the project lengthened. Among the latter was poverty.
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Gafny, Ron, A. L. N. Rao, and Edna Tanne. Etiology of the Rugose Wood Disease of Grapevine and Molecular Study of the Associated Trichoviruses. United States Department of Agriculture, 2000. http://dx.doi.org/10.32747/2000.7575269.bard.

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Rugose wood is a complex disease of grapevines, characterized by modification of the woody cylinder of affected vines. The control of rugose wood is based on the production of healthy propagation material. Detection of rugose wood in grapevines is difficult and expensive: budwood from tested plants is grafted onto sensitive Vitis indicators and the appearance of symptoms is monitored for 3 years. The etiology of rugose wood is complex and has not yet been elucidated. Several elongated clostero-like viruses are consistently found in affected vines; one of them, grapevine virus A (GVA), is closely associated with Kober stem grooving, a component of the rugose wood complex. GVA has a single-stranded RNA genome of 7349 nucleotides, excluding a polyA tail at the 3' terminus. The GVA genome includes five open reading frames (ORFs 1-5). ORF 4, which encodes for the coat protein of GVA, is the only ORF for which the function was determined experimentally. The original objectives of this research were: 1- To produce antisera to the structural and non-structural proteins of GVA and GVB and to use these antibodies to establish an effective detection method. 2- Develop full length infectious cDNA clones of GVA and GVB. 3- Study the roll of GVA and GVB in the etiology of the grapevine rugose wood disease. 4- Determine the function of Trichovirus (now called Vitivirus) encoded genes in the virus life cycle. Each of the ORFs 2, 3, 4 and 5 genes of GVA were cloned and expressed in E. coli and used to produce antisera. Both the CP (ORF 4) and the putative MP (ORF 3) were detected with their corresponding antisera in-GVA infected N. benthamiana and grapevine. The MP was first detected at an early stage of the infection, 6-12 h after inoculation, and the CP 2-3 days after inoculation. The MP could be detected in GVA-infected grapevines that tested negative for CP, both with CP antiserum and with a commercially available ELISA kit. Antisera to ORF 2 and 5 encoded proteins could react with the recombinant proteins but failed to detect both proteins in GVA infected plants. A full-length cDNA clone of grapevine virus A (GVA) was constructed downstream from the bacteriophage T7 RNA polymerase promoter. Capped in vitro transcribed RNA was infectious in N. benthamiana and N. clevelandii plants. Symptoms induced by the RNA transcripts or by the parental virus were indistinguishable. The infectivity of the in vitro-transcribed RNA was confirmed by serological detection of the virus coat and movement proteins and by observation of virions by electron microscopy. The full-length clone was modified to include a gus reporter gene and gus activity was detected in inoculated and systemic leaves of infected plants. Studies of GVA mutants suggests that the coat protein (ORF 4) is essential for cell to cell movement, the putative movement protein (ORF 3) indeed functions as a movement protein and that ORF 2 is not required for virus replication, cell to cell or systemic movement. Attempts to infect grapevines by in-vitro transcripts, by inoculation of cDNA construct in which the virus is derived by the CaMV 35S promoter or by approach grafting with infected N. benthamiana, have so far failed. Studies of the subcellular distribution of GFP fusion with each of ORF 2, 3 and 4 encoded protein showed that the CP fusion protein accumulated as a soluble cytoplasmatic protein. The ORF 2 fusion protein accumulated in cytoplasmatic aggregates. The MP-GFP fusion protein accumulated in a large number of small aggregates in the cytoplasm and could not move from cell to cell. However, in conditions that allowed movement of the fusion protein from cell to cell (expression by a PVX vector or in young immature leaves) the protein did not form cytoplasmatic aggregates but accumulated in the plasmodesmata.
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Young, Craig. Problematic plant monitoring in George Washington Carver National Monument: 2006–2020. Edited by Tani Hubbard. National Park Service, 2022. http://dx.doi.org/10.36967/nrr-2293655.

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Managers are challenged with the impact of problematic plants, including exotic, invasive, and pest plant species. Information on the cover and frequency of these plant species is essential for developing risk-based approaches to managing them. Based on surveys conducted in 2006, 2013, 2016, and 2020, Heartland Inventory and Monitoring Network staff and contractors identified a cumulative total of 50 potentially problematic plant species in George Washington Carver National Monument. Of the 35 species found in 2020 , we characterized 8 as very low frequency, 9 as low frequency, 10 as medium frequency, and 8 as high frequency. Of these, midpoint cover estimates of only 1 high frequency species, tall fescue, exceeded the 10-acre threshold. Because of the number, extent, and cover of problematic plants in the park and the small park size, control efforts should focus on treating high priority species across the entire park. High priority species may include plant species capable of rapid spread, species at low population levels, and species that can be effectively controlled.
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