Relevant bibliographies by topics / Two tails

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Two tails'

Author: Grafiati
Published: 4 June 2025
Last updated: 23 June 2025

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Journal articles on the topic "Two tails"

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Chatterjee, Pranab, and Amy D'Aprix. "Two Tails of Justice." Families in Society: The Journal of Contemporary Social Services 83, no. 4 (2002): 374–86. http://dx.doi.org/10.1606/1044-3894.11.

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It is argued that justice is a form of group behavior, and that there are basically five types of justice: protective, corrective, restorative, distributive, and representational. Corrective and protective justice, for the most part, help attain social control and strengthen existing social order. Distributive and representational justice often help the marginalized and disadvantaged members of a group. Restorative justice is in the middle, and performs both functions. Thus, justice seems to have two tails, similar to that found in a normal curve in statistics. One of these tails, where corrective and protective justice help support the existing social order of groups, provides social stability. The other tail, where distributive and representational justice support the vulnerable and the marginalized members of a group, generates the thrust for social change. Social workers need to understand the proper role of both of these tails.
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May, Robin C. "Two tales of tails." Trends in Cell Biology 11, no. 10 (2001): 401. http://dx.doi.org/10.1016/s0962-8924(01)02115-8.

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Machesky, Laura M. "The Tails of Two Myosins." Journal of Cell Biology 148, no. 2 (2000): 219–22. http://dx.doi.org/10.1083/jcb.148.2.219.

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Schuyler, Jane. "MICHELANGELO'S SERPENT WITH TWO TAILS." Source: Notes in the History of Art 9, no. 2 (1990): 23–29. http://dx.doi.org/10.1086/sou.9.2.23202629.

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Bentley, David. "A tale of two tails." Nature 395, no. 6697 (1998): 21. http://dx.doi.org/10.1038/25616.

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Favreau, Olga Eizner, and James C. Everett. "A tale of two tails." American Psychologist 51, no. 3 (1996): 268–69. http://dx.doi.org/10.1037/0003-066x.51.3.268.

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GILL, C. O., J. C. McGINNIS, and T. JONES. "Assessment of the Microbiological Conditions of Tails, Tongues, and Head Meats at Two Beef-Packing Plants." Journal of Food Protection 62, no. 6 (1999): 674–77. http://dx.doi.org/10.4315/0362-028x-62.6.674.

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Newly skinned tails of beef carcasses at two packing plants were similarly contaminated with total aerobes and with coliforms that were largely Escherichia coli at log mean numbers about 3.5/cm2 and 4.5/100 cm2, respectively. The log mean numbers of aerobes and coliforms on the skinned tails after washing at plant A were, respectively, 1 and 2 log units less than the numbers on the newly skinned tails. At plant B, the log mean numbers of aerobes on skinned and on washed tails were similar while the log mean numbers of E. coli on washed tails were only about 1 log unit less than the numbers on skinned tails. Cooling of tails on racks in a chiller at plant B reduced the log mean numbers of E. coli by about 1 log unit but did not reduce the numbers of total aerobes. Tongues in the heads of carcasses at both plants were similarly contaminated with total aerobes and with coliforms that were largely E. coli at log mean numbers of about 4.5/cm2 and 4.5/100 cm2, respectively. The log mean numbers of aerobes on and the log total number of E. coli recovered from washed tongues were, respectively, about 2 and 4 log units less than for unwashed tongues at plant A and about 1 and 3 log units less than for unwashed tongues at plant B. The log mean numbers of aerobes and E. coli on washed cheeks and lips were both about 2 log units less than the numbers on unwashed tongues at both plants. With appropriate collection and washing procedures, the microbiological conditions of beef tails, tongues, and head meats can apparently be comparable to those of primal cuts and manufacturing beef at the times that the products are packed.
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Liu, Yuying, Yao Wang, Pengye Wang, and Ping Xie. "Effect of Kinesin-5 Tail Domain on Motor Dynamics for Antiparallel Microtubule Sliding." International Journal of Molecular Sciences 22, no. 15 (2021): 7857. http://dx.doi.org/10.3390/ijms22157857.

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Kinesin-5 motor consists of two pairs of heads and tail domains, which are situated at the opposite ends of a common stalk. The two pairs of heads can bind to two antiparallel microtubules (MTs) and move on the two MTs independently towards the plus ends, sliding apart the two MTs, which is responsible for chromosome segregation during mitosis. Prior experimental data showed that the tails of kinesin-5 Eg5 can modulate the dynamics of single motors and are critical for multiple motors to generate high steady forces to slide apart two antiparallel MTs. To understand the molecular mechanism of the tails modulating the ability of Eg5 motors, based on our proposed model the dynamics of the single Eg5 with the tails and that without the tails moving on single MTs is studied analytically and compared. Furthermore, the dynamics of antiparallel MT sliding by multiple Eg5 motors with the tails and that without the tails is studied numerically and compared. Both the analytical results for single motors and the numerical results for multiple motors are consistent with the available experimental data.
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Sallan, Lauren. "Fish ‘tails’ result from outgrowth and reduction of two separate ancestral tails." Current Biology 26, no. 23 (2016): R1224—R1225. http://dx.doi.org/10.1016/j.cub.2016.10.036.

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Vyas, Raju. "Bifid tails in two Indian lizards." Reptiles & Amphibians 23, no. 2 (2016): 108–9. http://dx.doi.org/10.17161/randa.v23i2.14118.

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Dissertations / Theses on the topic "Two tails"

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Wang, Zhao. "Synthesis of Polyhedral Oligomeric Silsesquioxane(POSS)-Based Shape Amphiphiles with Two Polymeric Tails of Symmetric or Asymmetric Compositions." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1366825911.

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Cook, Clive George Carleton University Dissertation Engineering Electrical. "Two stage data echo cancellation utilizing orthonormal functions for echo tail cancellation." Ottawa, 1989.

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Otipoby, Kevin L. "CD22 regulates B cell fate via two signaling domains within its cytoplasmic tail /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/8335.

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SHAH, RAVI. "A numerical study on backfilling of the tail void with two-component grout based on laboratory tests." Doctoral thesis, Politecnico di Torino, 2017. http://hdl.handle.net/11583/2680098.

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In mechanized tunneling the annular gap between the segmental lining and the surrounding soil caused by tunnel driving must be backfilled instantaneously with an adequate mortar. The annular gap is caused due to the conical shape, overcut and design of the shield. The soft ground tunneling has a prime focus on the settlement control and optimization of the parameters involved. The backfilling is a key component to reduce the surface settlements and deformations after the passage of the TBM. The main functions of backfilling are to 1. lock the segmental lining in position avoiding movements due to self-weight of the lining and other forces present; 2. To bear the loads transmitted by TBM backup weight; 3. Provide a uniform contact between the lining and surrounding soil and 4. Waterproofing the tunnel. Recent developments in the field of backfilling have led to the development of a state-of-the-art two-component grouting system. A two-component grout consists of two components, Component A (Bentonite, water, cement and a retarder), component B (Sodium silicate based accelerator and water). When these two components are mixed just behind the annular gap, the grout starts to attain plasticity in a very quick time and thus, is able to transfer the load to the segmental lining in a very short time after its injection to the annular gap. For a good backfilling grout it is important to satisfy certain engineering aspects (Fluidity, binding and gelling time, mechanical strength). The aim of this research is to understand the behavior of a two component grout in its fresh and hardened state and implement those obtained parameters in a numerical code. A series of laboratory tests are to perform on the two-component grout to determine its physical and mechanical behaviour. Bleeding, Marsh cone and gelling time tests are conducted on the fresh grout sample to test its chemical binding, viscosity and time taken to achieve plastic strain. A series of uniaxial compressive strength (UCS) tests are conducted on the grout sample to obtain its elastic modulus in its early days of setting (up to 28 days). In order to obtain and examine the state and strength of the grout in long term, a string of UCS tests are carried out on two-component grout samples cured at natural humidity of the soil in long terms (up to 1080 days). In addition to this, permeability and dewatering properties of a two-component are determined in its early state. Furthermore, the stiffness of the hardened grout sample in confined condition is determined by conducting oedometer tests. The oedeometer tests are conducted at various time intervals to obtain a complete time-dependent stiffness of the grout. The research deals with the development of a robust numerical model taking into account all the relevant factors involved in mechanized tunnelling but focusing mainly on the backfilling procedure using FDM software FLAC 3D. The backfilling in the tail grout is modeled as normally applied pressure in a liquid state and later a time-dependent hardening behavior of the grout is initiated. The time-dependent behavior parameters are obtained from the laboratory tests conducted. A new constitutive model (CM) named as Plastic-Hardening (PH) is implemented to model the behavior of the surrounding soil. This CM gives the user a freedom to implement different stiffness for loading and unloading. Since the Mohr-Coulomb (MC) model specifies only one elastic modulus for both loading and unloading, it is unsuitable for cyclic and staged excavation procedures such as mechanized tunnelling itself. The PH CM is validated with the FEM software PLAXIS 3D before implementing it in FLAC 3D. Moreover, Hydro-mechanical coupled analysis is also conducted in the near-field domain of the grouting zones to update the permeability and stiffness of the grout due to consolidation.
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Ardison, Kym Marcel Martins. "Nonparametric tail risk, macroeconomics and stock returns: predictability and risk premia." reponame:Repositório Institucional do FGV, 2015. http://hdl.handle.net/10438/13666.

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Submitted by Kym Marcel Martins Ardison (kymmarcel@gmail.com) on 2015-04-06T19:04:20Z No. of bitstreams: 1 Tail Risk - Original.pdf: 817189 bytes, checksum: 02561a6a7cb94d1480a4f78933486df4 (MD5)<br>Approved for entry into archive by BRUNA BARROS (bruna.barros@fgv.br) on 2015-04-28T12:21:10Z (GMT) No. of bitstreams: 1 Tail Risk - Original.pdf: 817189 bytes, checksum: 02561a6a7cb94d1480a4f78933486df4 (MD5)<br>Approved for entry into archive by Marcia Bacha (marcia.bacha@fgv.br) on 2015-05-04T12:33:49Z (GMT) No. of bitstreams: 1 Tail Risk - Original.pdf: 817189 bytes, checksum: 02561a6a7cb94d1480a4f78933486df4 (MD5)<br>Made available in DSpace on 2015-05-04T12:37:02Z (GMT). No. of bitstreams: 1 Tail Risk - Original.pdf: 817189 bytes, checksum: 02561a6a7cb94d1480a4f78933486df4 (MD5) Previous issue date: 2015-02-12<br>This paper proposes a new novel to calculate tail risks incorporating risk-neutral information without dependence on options data. Proceeding via a non parametric approach we derive a stochastic discount factor that correctly price a chosen panel of stocks returns. With the assumption that states probabilities are homogeneous we back out the risk neutral distribution and calculate five primitive tail risk measures, all extracted from this risk neutral probability. The final measure is than set as the first principal component of the preliminary measures. Using six Fama-French size and book to market portfolios to calculate our tail risk, we find that it has significant predictive power when forecasting market returns one month ahead, aggregate U.S. consumption and GDP one quarter ahead and also macroeconomic activity indexes. Conditional Fama-Macbeth two-pass cross-sectional regressions reveal that our factor present a positive risk premium when controlling for traditional factors.
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Lawson, Vannice Rose Marie. "The molecular cloning and developmental expression of two novel mRNAs encoding putative 14 kDa ODF and FS proteins of the rat sperm tail." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq28218.pdf.

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Chen, Qian. "Bayesian Methods for Estimation, Inference and Forecasting of Flexible Models for Value-at-Risk and Tail Conditional Expectations." Thesis, The University of Sydney, 2011. http://hdl.handle.net/2123/7863.

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Forecasting financial risk and risk measurement methods have been of increasing interest for financial market regulators and financial institutions in the past two decades. While the parametric and semi-parametric models have been widely reviewed in the academic literature, the non-parametric methods are popular in practice among the financial institutions. This thesis examines the forecasting models for Value-at-Risk (VaR) and conditional Value-at-Risk for financial return series. The aims of this thesis are to: 1. Estimate and forecast the potential skewness and dynamics in higher moments for conditional return distributions; 2. Develop flexible parametric models that can accurately forecast the portfolio tail risk levels. 3. Examine the impacts of asymmetry in the volatility and that in the shape of the conditional return distributions on the risk level forecasting. 4. Derive an easily applicable backtesting method for conditional VaR or expected shortfall. 5. Improve the efficiency and accuracy of Bayesian computational schemes for parameter estimation and forecasts. To achieve the above goals, this thesis first proposes a parametric approach to estimating and forecasting Value-at-Risk (VaR) and Expected Shortfall (ES) for a heteroscedastic financial return series. A GJR-GARCH is used to model the volatility process, capturing the leverage effect. To account for potential skewness and heavy tails, the model assumes an asymmetric Laplace (AL) distribution as the conditional distribution of the financial return series. Furthermore, dynamics in higher moments are captured by allowing for a time-varying shape parameter in this distribution. An adaptive Markov chain Monte Carlo (MCMC) sampling scheme is used for estimation, employing the Metropolis--Hastings (MH) algorithm with a mixture of Gaussian proposal distributions. A simulation study shows accurate estimation and improved inference of parameters in comparison with a single Gaussian proposal MH method. We illustrate the model by applying it to forecast return series from four international stock market indices, as well as two exchange rates, and generating one step-ahead forecasts of VaR and ES. We apply standard and non-standard tests to these forecasts, as well as to those from some competing methods, and find that the proposed model performs favourably compared to many popular competitors; in particular, it is the only conservative model of risk among the models considered in this work over the period studied, which includes the recent financial crisis. However, an AL conditional ditribution may forecast risk too conservatively, and over-estimate the risk levels by a factor of two. In other words, the model implies the necessity for financial institutions to set aside up to twice as much regulatory capital as they need. With fixed total capital, the capital available to invest is reduced, leading to a lowered profit potential. To address this dilemma, this study develops and employs a two-sided Weibull (TW) distribution to capture potential skewness and fat-tailed behaviour in the conditional financial return distribution for the purposes of risk measurement and management, specifically focusing on the forecasting of VaR and conditional VaR measures. Four volatility model specifications, including both symmetric and nonlinear versions, are considered to capture heteroscedasticity. An adaptive Bayesian MCMC scheme is devised for estimation, inference, and forecasting. A range of conditional return distributions (TW, AL, symmetric, and skewed Student t) are combined with the four volatility specifications to forecast risk measures. The study finds that the GARCH-type volatility specification is much less important than that of the conditional distribution and, while the Student t distribution performs particularly well on VaR forecasting, the two-sided Weibull performs at least equally well for VaR, but the most favourably for conditional VaR forecasting, both prior to as well as during and after the recent financial crisis. Nonetheless, the TW distribution can be bimodal, while the conditional distribution of real financial return series are known to be uni-modal. To address this issue, this study develops a partitioned distribution, combining the Weibull tails with a uni-modal AL centre. The proposed distribution is combined with the GJR-GARCH volatility model, to estimate and forecast the VaR and Conditional VaR. The estimation is via an adaptive MCMC sampling scheme and the MH algorithm, with a more general and flexible mixture of Student t proposal distributions. A simulation study demonstrates the estimation is marginally closer to the true values than the mixture of Gaussian proposal distributions. The model is illustrated via application to real financial return series, generating one-day-ahead forecasts and is compared with several competing models. The forecasts are evaluated by formal and non-formal backtesting methods. The model-fitting performances are demonstrated by a range of residual tests. We find the partitioned distribution forecasts financial tail risks slightly less accurately than the TW, but is most favoured by the residual tests.
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Johansson, Maya. "Vilka möjligheter ges barn med funktionsnedsättning att komma till tals? : – ur LSS-handläggares perspektiv." Thesis, Växjö University, School of Health Sciences and Social Work, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-5958.

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<p>About 29 000 different services was given by the Swedish welfare state to children with disabilities within the ages 0-22 years before October first in the year 2008. Studies about children with disabilities and their experiences of their situation have rarely been done and it is therefore difficult to know how they think and feel about their lives. Both Swedish law and the UN:s convention about children’s rights states that children have the right to tell their opinion in matters that are of their concern. Thus, we don´t know much about if and how the Swedish welfare state maintain this right towards children with disabilities. This is aimed to reveal if and how the Swedish welfare state, trough it´s municipality servants, give children with disabilities an opportunity to speak their mind trough the perspective of the municipality servant. This study is even aimed to reveal which difficulties, if any, the servants experience in their investigations of children with disabilities. The empirical material was analyzed trough a <em>perspective of children as actors and trough the theoretical ideas; <em>power-of-modeling and <em>the organizations many hands. A qualitative method was chosen to collect the empirical data for this study because this method is the best method in order to get the deep information that was needed in order to achieve a deeper understanding for the problem. The result is that children with disabilities don´t get the opportunity to speak their mind in their own cases because of many aspects such as; communication problems, the limitations within the law called LSS, the organizations limitations of the servants and the children’s own parents. </em></em></em></p>
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Olovsson, Katja. "Samtal med barnhandläggare : Om barn i familjehem och deras rätt att komma till tals." Thesis, Stockholms universitet, Institutionen för socialt arbete - Socialhögskolan, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-104777.

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The purpose of this study was to examine how some child welfare case workers say they go about to give children in foster homes the opportunity to be heard. The idea was also to examine how much weight is given to the children’s views and if the respondents believe that the childrens right to be heard has improved over the time they have been working with foster children and if so, how? The study was conducted by using qualitative research method and the analysis of the results was made using Shier’s model of childrens participation. The results have also been tied to previous research in the area. The conclusions of this study was that according to the respondents it’s important that they get to know the children well so that the children can have confidence enough to speak their minds. They feel it is important that the children are listened to and the childrens views also have some influence in decision-making. The respondents also believe that the opportunities for the children to express their opinions have strengthened in recent years.
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Saia, Rafael. "Proposta de classificação para a tipologia de produção Engineer to Order e definição das melhores práticas de manufatura em tais ambientes." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/18/18156/tde-03122013-101535/.

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A capacidade de customização de produtos é considerada atualmente um fator de competitividade muito importante para a sobrevivência das empresas. A interferência dos clientes na concepção e na fabricação dos produtos está cada vez mais intensa. Dentre as várias estratégias de customização, a tipologia de produção Engineer to Order (ETO), na qual o cliente é envolvido nas fases de design e desenvolvimento do produto, é considerada a mais complexa e ineficiente. Embora o número de organizações classificadas como ETO seja bastante elevado e os problemas associados a esta tipologia sejam bem conhecidos, não existem registros consolidados na literatura sobre qual é a melhor abordagem de gestão das cadeias produtivas destes ambientes. Além disso, as práticas de gestão sugeridas por alguns pesquisadores consideram a tipologia ETO um sistema homogêneo, no qual todas as empresas recebem as mesmas abordagens. No entanto, dentro do universo ETO existem empresas com diferentes tipos de customização. Algumas empresas fabricam produtos completamente novos, desenvolvidos para clientes específicos. Outras empresas fornecem produtos com estrutura híbrida, na qual alguns componentes são padronizados e outros são customizados. A grande diferença entre os sistemas produtivos ETO exige que cada ambiente receba uma abordagem específica para o seu modelo de negócio. Com o intuito de preencher esta lacuna, o presente trabalho propõe uma classificação da tipologia ETO com recomendações das melhores práticas de manufatura para cada subtipologia ETO definida. A classificação proposta foi baseada em estudos de caso com implementações de projetos de melhoria em diferentes ambientes ETO.<br>The ability of customizing products is considered a very important competitive factor for the survival of nowadays companies. The power of customers influence on products conception and manufacturing is increasing. Among the various customization strategies, the Engineer to Order (ETO) production typology, in which customers are involved at product design and development stages, is considered the most complex and inefficient. Although there are many organizations classified as ETO and the problems associated with this typology are very known, there is a lack of agreement in literature about the best practices for the value chain management of these environments. Furthermore, the practices suggested by some researchers consider the ETO typology as a homogeneous system where all the companies receive the same approach. However, the companies of the ETO universe show different customization approaches. Some companies produce products completely new and designed for specific customers. Other companies provide products with a hybrid structure which is formed by standardized and customized components. The big difference found between all kinds of ETO production systems implies that specific approaches have to be applied for each business model. In order to fill this gap, this work offers a classification for the ETO typology with some recommendations of the best manufacturing practices for each ETO sub typology defined. The proposed classification was based on cases of improvement projects implemented in different ETO environments.
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Books on the topic "Two tails"

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Lin, Oliver, ed. A tale of two tails. Grosset & Dunlap, 2008.

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Tony, Harrison. The fire gap: A poem with two tails. [The author?], 1985.

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Tony, Harrison. The fire gap: A poem with two tails. Bloodaxe Books, 1985.

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Sheehan, Danny. Heads and tails: The story of the Kalgoorie two-up school. [s.n.], 1985.

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Hamel, Mike. Talis hunters: Book two. Matterhorn Press, LLC, 2001.

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Königslöw, Andrea Wayne Von. A tail between two cities. Annick Press, 1987.

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Cleary, Melissa. A tail of two murders. Diamond Books, 1992.

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Bruce, Winkle, and Hauffe Penny, eds. The tail of two corgis. Merrazz-LLC., 2012.

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Copyright Paperback Collection (Library of Congress), ed. A tail of two murders. Diamond Books, 1992.

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Jackson, Tony, and Jeff Nuttall. Two Tails. Writers' Forum, 1985.

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Book chapters on the topic "Two tails"

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Simpson, Phil. "Long Tails of Two Bears." In Patrick Moore's Practical Astronomy Series. Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6941-5_2.

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Arcas, D. R., and L. G. Redekopp. "Drag Reduction of Two-Dimensional Bodies by Addition of Boat Tails." In The Aerodynamics of Heavy Vehicles: Trucks, Buses, and Trains. Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-44419-0_23.

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Sun, Faming, and Xinsheng Xu. "The Control Mechanism of a New Fish-Like Underwater Robot with Two Tails." In Intelligent Robotics and Applications. Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-88513-9_33.

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Lethbridge, Tom. "Two." In The Monkey's Tail. Routledge, 2024. http://dx.doi.org/10.4324/9781003570332-4.

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Bowkett, Steve, and Tony Hitchman. "Heads or tails." In Visualising Literacy and How to Teach It. Routledge, 2021. http://dx.doi.org/10.4324/9781003184003-47.

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Domański, Paweł D. "What happens in tails? – outliers." In Back to Statistics. CRC Press, 2025. https://doi.org/10.1201/9781003604709-8.

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Domański, Paweł D. "Non-Gaussian distributions – the tails." In Back to Statistics. CRC Press, 2025. https://doi.org/10.1201/9781003604709-6.

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Handy, Femida, and Allison R. Russell. "Case 10: A Tail of Two Employees." In Ethics for Social Impact. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-75040-8_15.

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Domański, Paweł D. "Extreme Statistics – the Power of Tails." In Back to Statistics. CRC Press, 2025. https://doi.org/10.1201/9781003604709-7.

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Segal, Ariel. "Tails we go, heads we stay." In Social Structure Adaptation to COVID-19. Routledge, 2024. http://dx.doi.org/10.4324/9781032690278-8.

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Conference papers on the topic "Two tails"

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Agarwal, D. C., Lee Stewart, and Mike McAllister. "Alloy 602CA(UNS N06025) Solves Pig Tail Corrosion Problems in Refineries." In CORROSION 2003. NACE International, 2003. https://doi.org/10.5006/c2003-03656.

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Abstract In high temperature corrosion, besides oxygen and nitrogen attack, alloys frequently encounter attack by carbon species. This attack can take two forms namely carburization and metal dusting (some times referred to as catastrophic carburization). Carburization generally occurs at carbon activities less than 1 and at temperatures typically greater than 800° to 850°C and may result in alloy embrittlement due to formation of internal carbides. Metal Dusting on the other hand, leads to rapid wastage, thinning and disintegration of alloys into graphite, metal particles, and possibly carbides / oxides and occurs in environments with carbon activities significantly greater than 1 and temperatures in range of 430 to 850° C. Metal dusting has been encountered in many industries such as in production of hydrogen, syngas, chemical plants for the synthesis of hydrocarbons, methanol, ammonia, pig tails of reformer furnaces, refineries, petrochemical plants, heat treating and reduction of iron ore plants. Attempts to inhibit metal dusting can take many forms such as using better alloy metallurgy, surface engineering modifications and/or pre-treatments of the alloy surfaces, use of coatings and using gas inhibitors such as addition of sulfide compounds (H2S), which causes other problems of sulfidation attack and catalyst poisoning. This paper presents a case history on tests conducted in a Texas reformer unit, as a pig tail component, where the environment consisted of CO &amp; CO2 with the CO:CO2 ratio between 3 to 4, methane, hydrogen and a small amount of propylene at operating temperature range of 1100°F to 1400°F (593°C to 760°C). This is a very severe metal dusting environment. Many nickel base and iron base alloys were tested and a co-relation with “Chromium Equivalent” defined as “ % Cr + 3 (% Al + % Si)” with the metal wastage rates were developed. The nickel base alloy 602CA(UNS N06025) gave the best performance. Also presented are some laboratory data on this alloy in metal dusting and other environments, physical metallurgy characteristics of this alloy along with some other high temperature applications.
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Pan, Mengqiu, Kasra Shayar Bahadori, Maryam Eslami, Bruce Brown, and Marc Singer. "Development of Methodologies for Continuous and Batch Inhibitor Film Persistency Investigation in the Laboratory." In CONFERENCE 2022. AMPP, 2022. https://doi.org/10.5006/c2022-18056.

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Abstract Organic corrosion inhibitors (CIs) are widely used in the oil and gas industry to mitigate corrosion in pipeline transmission systems. Upstream, there are two distinct internal pipeline corrosion mitigation methods using inhibitors: continuous injection and batch inhibition. Each treatment mode has its own challenges, requiring specific knowledge of inhibitor film persistency (i.e., interrupted continuous injection or irregularity in batch inhibitor application frequency). The performance of applied corrosion inhibitors is typically evaluated in laboratory conditions, prior to field application. This study is focused on development of methodologies to investigate inhibitor film persistency using inhibitor model compounds, possessing only one molecular type, in both continuous and batch inhibition. For persistency studies related to continuous treatment, experiments were divided into three main steps: pre-corrosion, inhibitor addition, and inhibitor dilution. For batch inhibition, an inhibitor testing procedure was developed that can maintain stable water chemistry and avoid O2 contamination, with the potential to be adapted for top-of-the-line corrosion (TLC) environments. Corrosion rates were monitored using linear polarization resistance (LPR) in all experiments (except in TLC conditions). The Langmuir isotherm model was used to calculate adsorption coefficient kA and desorption coefficient kD for benzyldimethylammonium (BDA) inhibitor model compounds, possessing tetradecyl and hexadecyl tails, at different temperatures.
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Zhu, Zheng, and Qi-Jun Zhao. "Numerical Analyses for Aerodynamic and Noise Characteristics of Helicopter Scissors Tail Rotor." In Vertical Flight Society 70th Annual Forum & Technology Display. The Vertical Flight Society, 2014. http://dx.doi.org/10.4050/f-0070-2014-9413.

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Numerical analyses for aerodynamic and noise characteristics of helicopter scissors tail rotor both in hover and forward flight are conducted. A solver named CFD/FW-H method which combines the CFD method and FW-H approach is established to predict the noise characteristics of scissors tail rotor. In this solver, based on the moving-embedded grid system, a CFD simulation method for aerodynamic characteristics of scissors tail rotor is developed by solving the unsteady RANS equations with Baldwin-Lomax turbulence model, and the discretization of convective fluxes is completed by ROE-MUSCL scheme. Then, the differences on aerodynamic and acoustic characteristics between the two types of scissors tail rotors (Configuration L and Configuration U) are discussed. Also, the influences of the two configuration parameters (scissors angle and vertical space) on their aerodynamic and acoustic characteristics have been analyzed both in hover and forward flight. Additionally an optimization procedure based on surrogate model is employed to conduct the optimization for aerodynamic and noise characteristics of scissors tail rotor in hover. It is demonstrated that the aerodynamic and acoustic characteristics of a scissors tail rotor are not always better than those of a conventional one. In addition, Configuration L shows more advantages of improving the aerodynamic and noise characteristics than Configuration U due to the weaker blade-vortex interaction.
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Baker, Treven, Andrea Chavez, Jason Fetty, and Steven Spears. "Design and Testing of the Bell FARDS Tail Rotor Driveshaft." In Vertical Flight Society 71st Annual Forum & Technology Display. The Vertical Flight Society, 2015. http://dx.doi.org/10.4050/f-0071-2015-10245.

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Testing was recently performed on a new tail rotor drive shaft (TRDS) technology developed under the Future Advanced Rotorcraft Drive System (FARDS) program. The FARDS TRDS operates above its third critical speed, has a curved shaft centerline, and utilizes a novel damper design, advanced materials, and advanced manufacturing technologies. This TRDS design allows for a reduction from seven shaft segments to only two, which reduces system weight and cost. The endurance, low cycle fatigue, and high cycle fatigue testing performed on this drive shaft design was successful, and demonstrated a Technology Readiness Level (TRL) 6.
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Wright, Jason, and Roger Aubert. "Icing Wind Tunnel Test of a Full Scale Heated Tail Rotor Model." In Vertical Flight Society 70th Annual Forum & Technology Display. The Vertical Flight Society, 2014. http://dx.doi.org/10.4050/f-0070-2014-9661.

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In August and September of 2013 a rotor blade icing test was conducted at NASA Glenn Research Center's Icing Research Tunnel (IRT). The test model was a two bladed, teetering rotor with electro-thermal heater blankets installed onto the blades. The model was developed as part of the Vertical Lift Consortium (VLC) project entitled, "High Fidelity Icing Analysis for Rotors". This project was a collaborative effort between industry, academia, and government. This paper will present a description of the motivation behind the test, the model design, and the installation. This paper will also present a summary of the configurations, conditions, and challenges encountered during testing.
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Singh, Himanshu, and Sumit Sharma. "Designing Corrosion Inhibitors with High Aqueous Solubility and Low Tendency towards Micellization: a Molecular Dynamics Study." In CORROSION 2020. NACE International, 2020. https://doi.org/10.5006/c2020-15079.

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Abstract Two desirable characteristics of corrosion inhibitors is their high aqueous solubility and their low tendency to micellize. In this work, we propose that addition of a polar moiety to the terminal end of the alkyl tail of the quaternary ammonium-based corrosion inhibitors improves both these characteristics. Our molecular simulation results show that corrosion inhibitors with a hydroxyl group as the terminal group of alkyl tail results in three orders of magnitude increase in the aqueous solubility and also significantly decreases the micellization tendency. These results are significant for the purpose of designing more potent corrosion inhibitor molecules.
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Phillips, Brandyn, Vikram Hrishikeshavan, and Inderjit Chopra. "Enhancing the Performance of a Quadrotor Biplane Tail-sitter (QBiT)." In Vertical Flight Society 74th Annual Forum & Technology Display. The Vertical Flight Society, 2018. http://dx.doi.org/10.4050/f-0074-2018-12688.

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To meet the performance demands of modern UAV operations, hybrid air vehicles that incorporate the speed and efficiency of fixed wing vehicles and the VTOL capabilities of rotorcraft have come to the forefront. This paper presents work being done to expand the performance of one such hybrid air vehicle, the quadrotor biplane. This vehicle takes flight in tail-sitter configuration and uses differential thrust vectors to pitch forward into forward flight configuration. This control method does not require conventional control surfaces, therefor making the system mechanically simple. The vehicle design and its package delivery functionality have been validated experimentally, in both hover and forward flight. Flight data was collected demonstrating the decreased power consumption in forward flight mode. Next, wind tunnel studies were conducted to explore measures to improve vehicle performance. Wind tunnel testing with variable pitch proprotors demonstrated a marked advantage over fixed pitch propellers at high airspeeds. To minimize drag and thus further improve vehicle performance, two different approaches to favorably modify lift distribution on the wings were considered. The method evaluated the effects of rotor spin direction and placement along the span. The second approach explored the implementation of various boxed wing geometries. Experimental results from the boxed wing wind tunnel test demonstrated that the coefficient of lift (CL) could be increased by up to 50% with a NACA 0005 box wing at Reynolds number (Re) of 108,000. The wing-propeller wind tunnel testing showed that having the rotors further outboard improved performance for the higher Reynolds numbers tested (Re of 60,000-100,000). Additionally, a significant increase in the CL was observed when the propeller direction was switched from inwardly rotating to outwardly rotating at Re = 100,000.
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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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Colgren, Richard, and Robert Loschke. "To Tail or Two Tails? - The Effective Design and Modeling of Yaw Control Devices." In AIAA Modeling and Simulation Technologies Conference and Exhibit. American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-4609.

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Wu, Bingyi, Charles Zhechao Liu, Kim-Kwang Raymond Choo, Hongyi Zhu, and Shen Chang. "Two-sided Long Tails on Blockchain-Based Crowdsourcing Platforms." In Hawaii International Conference on System Sciences. Hawaii International Conference on System Sciences, 2024. https://doi.org/10.24251/hicss.2024.499.

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Reports on the topic "Two tails"

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Monge-Naranjo, Alexander, Faisal Sohail, Ctirad Slavik, and Alexander Ludwig. Finance and Inequality: A Tale of Two Tails. Federal Reserve Bank of St. Louis, 2020. http://dx.doi.org/10.20955/wp.2020.044.

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Molloy, Raven, Christopher Smith, and Abigail Wozniak. Changing Stability in U.S. Employment Relationships: A Tale of Two Tails. National Bureau of Economic Research, 2020. http://dx.doi.org/10.3386/w26694.

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Gillingham, Kenneth, and Anders Munk-Nielsen. A Tale of Two Tails: Commuting and the Fuel Price Response in Driving. National Bureau of Economic Research, 2016. http://dx.doi.org/10.3386/w22937.

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Соловйов, В. М., В. В. Соловйова та Д. М. Чабаненко. Динаміка параметрів α-стійкого процесу Леві для розподілів прибутковостей фінансових часових рядів. ФО-П Ткачук О. В., 2014. http://dx.doi.org/10.31812/0564/1336.

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Modem market economy of any country cannot successfully behave without the existence of the effective financial market. In the conditions of growing financial market, it is necessary to use modern risk-management methods, which take non-gaussian distributions into consideration. It is known, that financial and economic time series return’s distributions demonstrate so-called «heavy tails», which interrupts the modeling o f these processes with classical statistical methods. One o f the models, that is able to describe processes with «heavy tails», are the а -stable Levi processes. They can slightly simulate the dynamics of the asset prices, because it consists o f two components: the Brownian motion component and jump component. In the current work the usage of model parameters estimation procedure is proposed, which is based on the characteristic functions and is applied for the moving window for the purpose of financial-economic system’ s state monitoring.
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Fritsch, Nicholas. Tail Sensitivity of US Bank Net Interest Margins: A Bayesian Penalized Quantile Regression Approach. Federal Reserve Bank of Cleveland, 2025. https://doi.org/10.26509/frbc-wp-202509.

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Bank net interest margins (NIM) have been historically stable in the US on average, but this stability deteriorated in the post-2020 period, particularly in the tails of the distribution. Recent literature disagrees on the extent to which banks hedge interest rate risk, and past literature shows that credit risk and persistence are also important considerations for bank NIM. I use a novel approach to Bayesian dynamic panel quantile regression to document heterogeneity in US bank NIM estimated sensitivities to interest rates, credit risk, and own persistence. I find increased sensitivity to interest rates in the tails of the conditional NIM distribution during the post-2020 period, driven by increased interest rate sensitivities of bank loans and deposits. Density forecast evaluation shows that the model forecasts outperform frequentist benchmark models, and standard tail risk measures show that risks to bank NIM have material implications for bottom-line measures of bank profitability.
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Hillman, Kylie, and Sue Thomson. 2018 Australian TALIS-PISA Link Report. Australian Council for Educational Research, 2021. http://dx.doi.org/10.37517/978-1-74286-598-0.

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Australia was one of nine countries and economies to participate in the 2018 TALIS-PISA link study, together with Cuidad Autónoma de Buenos Aires (Argentina), Colombia, the Czech Republic, Denmark, Georgia, Malta, Turkey and Viet Nam. This study involved coordinating the samples of schools that participated in the Program of International Student Assessment (PISA, a study of the performance of 15-year-old students) and the Teaching and Learning International Survey (TALIS, a study that surveys teachers and principals in lower secondary schools) in 2018. A sample of teachers from schools that were selected to participate in PISA were invited to respond to the TALIS survey. TALIS data provides information regarding the background, beliefs and practices of lower secondary teachers and principals, and PISA data delivers insights into the background characteristics and cognitive and non-cognitive skills of 15-year-old students. Linking these data offers an internationally comparable dataset combining information on key education stakeholders. This report presents results of analyses of the relationships between teacher and school factors and student outcomes, such as performance on the PISA assessment, expectations for further study and experiences of school life. Results for Australia are presented alongside those of the average (mean) across all countries and economies that participated in the TALIS-PISA link study for comparison, but the focus remains on what relationships were significant among Australian students.
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Hillman, Kylie, and Sue Thomson. 2018 Australian TALIS-PISA Link Report. Australian Council for Educational Research, 2021. http://dx.doi.org/10.37517/978-1-74286-628-4.

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Australia was one of nine countries and economies to participate in the 2018 TALIS-PISA link study, together with Cuidad Autónoma de Buenos Aires (Argentina), Colombia, the Czech Republic, Denmark, Georgia, Malta, Turkey and Viet Nam. This study involved coordinating the samples of schools that participated in the Program of International Student Assessment (PISA, a study of the performance of 15-year-old students) and the Teaching and Learning International Survey (TALIS, a study that surveys teachers and principals in lower secondary schools) in 2018. A sample of teachers from schools that were selected to participate in PISA were invited to respond to the TALIS survey. TALIS data provides information regarding the background, beliefs and practices of lower secondary teachers and principals, and PISA data delivers insights into the background characteristics and cognitive and non-cognitive skills of 15-year-old students. Linking these data offers an internationally comparable dataset combining information on key education stakeholders. This report presents results of analyses of the relationships between teacher and school factors and student outcomes, such as performance on the PISA assessment, expectations for further study and experiences of school life. Results for Australia are presented alongside those of the average (mean) across all countries and economies that participated in the TALIS-PISA link study for comparison, but the focus remains on what relationships were significant among Australian students.
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Adler, Robert J., Raisa E. Feldman, and Murad S. Taqqu. A Practical Guide to Heavy Tails: Statistical Techniques for Analyzing Heavy Tailed Distributions. Defense Technical Information Center, 1997. http://dx.doi.org/10.21236/ada336956.

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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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Sadot, Einat, Christopher Staiger, and Mohamad Abu-Abied. Studies of Novel Cytoskeletal Regulatory Proteins that are Involved in Abiotic Stress Signaling. United States Department of Agriculture, 2011. http://dx.doi.org/10.32747/2011.7592652.bard.

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In the original proposal we planned to focus on two proteins related to the actin cytoskeleton: TCH2, a touch-induced calmodulin-like protein which was found by us to interact with the IQ domain of myosin VIII, ATM1; and ERD10, a dehydrin which was found to associate with actin filaments. As reported previously, no other dehydrins were found to interact with actin filaments. In addition so far we were unsuccessful in confirming the interaction of TCH2 with myosin VIII using other methods. In addition, no other myosin light chain candidates were found in a yeast two hybrid survey. Nevertheless we have made a significant progress in our studies of the role of myosins in plant cells. Plant myosins have been implicated in various cellular activities, such as cytoplasmic streaming (1, 2), plasmodesmata function (3-5), organelle movement (6-10), cytokinesis (4, 11, 12), endocytosis (4, 5, 13-15) and targeted RNA transport (16). Plant myosins belong to two main groups of unconventional myosins: myosin XI and myosin VIII, both closely related to myosin V (17-19). The Arabidopsis myosin family contains 17 members: 13 myosin XI and four myosin VIII (19, 20). The data obtained from our research of myosins was published in two papers acknowledging BARD funding. To address whether specific myosins are involved with the motility of specific organelles, we cloned the cDNAs from neck to tail of all 17 Arabidopsis myosins. These were fused to GFP and used as dominant negative mutants that interact with their cargo but are unable to walk along actin filaments. Therefore arrested organelle movement in the presence of such a construct shows that a particular myosin is involved with the movement of that particular organelle. While no mutually exclusive connections between specific myosins and organelles were found, based on overexpression of dominant negative tail constructs, a group of six myosins (XIC, XIE, XIK, XI-I, MYA1 and MYA2) were found to be more important for the motility of Golgi bodies and mitochondria in Nicotiana benthamiana and Nicotiana tabacum (8). Further deep and thorough analysis of myosin XIK revealed a potential regulation by head and tail interaction (Avisar et al., 2011). A similar regulatory mechanism has been reported for animal myosin V and VIIa (21, 22). In was shown that myosin V in the inhibited state is in a folded conformation such that the tail domain interacts with the head domain, inhibiting its ATPase and actinbinding activities. Cargo binding, high Ca2+, and/or phosphorylation may reduce the interaction between the head and tail domains, thus restoring its activity (23). Our collaborative work focuses on the characterization of the head tail interaction of myosin XIK. For this purpose the Israeli group built yeast expression vectors encoding the myosin XIK head. In addition, GST fusions of the wild-type tail as well as a tail mutated in the amino acids that mediate head to tail interaction. These were sent to the US group who is working on the isolation of recombinant proteins and performing the in vitro assays. While stress signals involve changes in Ca2+ levels in plants cells, the cytoplasmic streaming is sensitive to Ca2+. Therefore plant myosin activity is possibly regulated by stress. This finding is directly related to the goal of the original proposal.
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