Relevant bibliographies by topics / Temperature strings

Academic literature on the topic 'Temperature strings'

Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Temperature strings"

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LIN, FENG-LI, TOSHIHIRO MATSUO, and DAN TOMINO. "HAGEDORN STRINGS IN AdS3." Modern Physics Letters A 23, no. 17n20 (June 28, 2008): 1552–64. http://dx.doi.org/10.1142/s0217732308027953.

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Motivated by the possibility of formulating a strings/black hole correspondence in AdS space, we extract the Hagedorn behavior of thermal AdS 3 bosonic string from 1-loop partition function of SL(2,R) WZW model. We find that the Hagedorn temperature is monotonically increasing as the AdS radius shrinks, reaches a maximum of order of string scale set by the unitarity bound of the CFT for internal space. The resulting density of states near the Hagedorn temperature resembles the form as for strings in flat space and is dominated by the space-like long string configurations. We also examine strings on BTZ background obtained through SL(2, Z) transformation. We find a tachyonic divergence for a BTZ black hole of string scale size.
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SATHIAPALAN, B. "THE HAGEDORN TRANSITION AND THE MATRIX MODEL FOR STRINGS." Modern Physics Letters A 13, no. 26 (August 30, 1998): 2085–94. http://dx.doi.org/10.1142/s0217732398002205.

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We use the matrix formalism to investigate what happens to strings above the Hagedorn temperature. We show that is not a limiting temperature but a temperature at which the continuum string picture breaks down. We study a collection of N D-0-branes arranged to form a string having N units of light-cone momentum. We find that at high temperatures the favored phase is one where the string worldsheet has disappeared and the low-energy degrees of freedom consists of N2 massless particles ("gluons"). The nature of the transition is very similar to the deconfinement transition in large-N Yang–Mills theories.
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Qin, Yanbin, Yinping Cao, Yihua Dou, Wenwen Lin, Jiahao Cao, and Luyao Wang. "Strength Failure of CO2 Injection Tubular Strings Considering CO2 Phase Transition." Energies 15, no. 23 (November 25, 2022): 8932. http://dx.doi.org/10.3390/en15238932.

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Compared with traditional injection tubular strings, the stresses on CO2 injection tubular strings are more complex. The results from field applications show that the phase transition of CO2 fluid in CO2 injection strings is an important factor in the calculation of temperature distribution and analysis of string mechanics. Therefore, we propose a strength analysis method for CO2 injection tubular strings that considers the CO2 phase transition. We selected four CO2 injection strings in an oil field in China as examples to evaluate their strength and safety. First, we established coupled differential equations for the temperature, pressure, and physical parameters of CO2 injection strings according to the theory of fluid flow and heat transfer. Then, we used an adaptive fuzzy neural network to construct the model for calculating the CO2 convection heat transfer coefficient and used this to obtain the high-precision convection heat transfer coefficients of tubular strings under conditions of CO2 flooding. We analyzed the injection-string deformations that resulted from the piston, spiral bending, expansion, friction and temperature effects according to the stress characteristics of the CO2 injection strings with packers under different working conditions. Finally, we performed mechanical analyses on the collapse resistance, internal pressure resistance, and tensile and triaxial stresses of the CO2 injection strings, and the results of these analyses provide a theoretical basis for the strength analysis of CO2 injection strings.
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CHAPLINE, G., and F. R. KLINKHAMER. "VORTICES IN HIGH-TEMPERATURE STRING THEORY." Modern Physics Letters A 04, no. 11 (June 10, 1989): 1063–67. http://dx.doi.org/10.1142/s0217732389001234.

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We discuss the role of XY-like vortices on the world-sheet for the free energy of strings at high temperatures. There is a Kosterlitz-Thouless phase transition at the Hagedorn temperature, above which the vortices contribute to the free energy in genus zero and generate a mass gap. We speculate that high-temperature “string” theory could be essentially discrete.
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Bowick, Mark J., and Steven B. Giddings. "High-temperature strings." Nuclear Physics B 325, no. 3 (October 1989): 631–46. http://dx.doi.org/10.1016/0550-3213(89)90500-2.

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Sanchez, N. G. "Advances in String Theory in Curved Backgrounds: A Synthesis Report." International Journal of Modern Physics A 18, no. 12 (May 10, 2003): 2011–22. http://dx.doi.org/10.1142/s0217751x0301543x.

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A synthetic report of the advances in the study of classical and quantum string dynamics in curved backgrounds is provided, namely : the new feature of Multistring solutions; the mass spectrum of Strings in Curved backgrounds; The effect of a Cosmological Constant and of Spacial Curvature on Classical and Quantum Strings; Classical splitting of Fundamental Strings; The General String Evolution in constant Curvature Spacetimes; The Conformal Invariance Effects; Strings on plane fronted and gravitational shock waves, string falling on spacetime singularities and its spectrum. New Developments in String Gravity and String Cosmology are reported: String driven cosmology and its Predictions; The primordial gravitational wave background; Non-singular string cosmologies from Exact Conformal Field Theories; Quantum Field Theory, String Temperature and the String Phase of de Sitter space-time; Hawking Radiation in String Theory and the String Phase of Black Holes; New Dual Relation between Quantum Field Theory regime and String regime and the "QFT/String Tango"; New Coherent String States and Minimal Uncertainty Principle in string theory.
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MATSUO, TOSHIHIRO. "HAGEDORN BEHAVIOR OF STRINGS IN AdS3/BTZ." International Journal of Modern Physics A 23, no. 14n15 (June 20, 2008): 2264–66. http://dx.doi.org/10.1142/s0217751x08041025.

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We study a finite temperature string in curved space, especially in AdS3 and BTZ black hole background. We extract Hagedorn behavior of strings and argue thermodynamic properties in thermal AdS3 as well as in BTZ black hole background. In particular, we find the Hagedorn temperature of string on AdS3, which depends on the AdS3 curvature scale. We also find a tachyonic divergence for a BTZ black hole of string scale.
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Arago, C., D. Bazeia, O. J. P. Éboli, and G. C. Marques. "Strings at finite temperature." Physical Review D 32, no. 12 (December 15, 1985): 3256–60. http://dx.doi.org/10.1103/physrevd.32.3256.

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Alvarez, E. "Strings at finite temperature." Nuclear Physics B 269, no. 3-4 (June 1986): 596–620. http://dx.doi.org/10.1016/0550-3213(86)90514-6.

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Odintsov, S. D., and I. M. Likhttsier. "Strings at nonzero temperature." Soviet Physics Journal 34, no. 12 (December 1991): 1053–89. http://dx.doi.org/10.1007/bf00896236.

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Dissertations / Theses on the topic "Temperature strings"

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Moomaw, Peter. "Drooped Strings and Dressed Mesons: Implications of Gauge-Gravity Duality for the Properties of Heavy-Light Mesons at Finite Temperature." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1250538856.

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Calo, Vincenzo. "Aspects of finite temperature corrections in string theory." Thesis, Queen Mary, University of London, 2011. http://qmro.qmul.ac.uk/xmlui/handle/123456789/701.

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In this thesis some aspects of temperature corrections in string theory are analyzed: in particular, we study the thermal contributions to the 4 dimensional effective potential arising from string theory compactifications. String theory predicts that the spacetime has more than 4 dimensions; in particular, supersymmetric string theories are consistent only if the spacetime has 10 dimensions, 1 time plus 9 space directions. In order to describe the physics of our Universe with string theory we make 6 spatial directions very small, namely, we curl them into a 6-dimensional space. The resulting 4-dimensional theory depends on a large number of parameters which are massless scalar fields called moduli. The different values that the moduli can take represent both the possible deformations of the 6- dimensional compact space and the values of the coupling constants and masses in the 4-dimensional spacetime. Allowing them to have arbitrary values leads to a lack of predictability of various 4D physical quantities, to a huge vacuum degeneracy and to unobserved long range fifth forces. In the thesis we review some methods established in the literature in order to fix the moduli values and hence to fix a particular geometry and we investigate how the inclusion of temperature corrections alter their values and affect the geometry of the compact space. The analysis seems to suggest that at least in the specific compactification scenarios considered in this thesis, temperature corrections do not alter substantially the zero temperature results. In the final part of this work, we analyze instead an example in which the inclusion of temperature corrections alters dramatically the picture at zero temperature. In particular, we study an unstable system constituted by a pair of Dirichlet (D) and anti-D brane that, although being unstable at zero temperature, it can become stable once finite temperature corrections are switched on.
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Lennek, Michael. "New Geometric Approaches to Finite Temperature String Theory." Diss., The University of Arizona, 2007. http://hdl.handle.net/10150/193803.

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In quantum field theory a system at finite temperature can equivalently be viewed as having a compactified dimension. This situation carries over into string theory and leads to thermal duality, which relates the physics of closed strings at temperature T to the physics at the inverse temperature 1/T. Unfortunately, the classical definitions of thermodynamic quantities such as entropy and specific heat are not invariant under the thermal duality symmetry. We shall therefore pursue two different approaches. We shall investigate whether there might nevertheless exist special solutions for the string effective potential such that the duality symmetry will be preserved for all thermodynamic quantities. Imposing thermal duality covariance, we derive unique functional forms for the temperature-dependence of the string effective potentials.The second approach is to investigate self-consistent modifications to the rules of ordinary thermodynamics such that thermal duality is preserved. After all, methods of calculation should not break fundamental symmetries. We therefore propose a modification of the traditional definitions of these quantities, yielding a manifestly duality-covariant thermodynamics. At low temperatures, these modifications produce "corrections" to the standard definitions of entropy and specific heat which are suppressed by powers of the string scale. These corrections may nevertheless be important for the full development of a consistent string thermodynamics.One can also investigate the limitations of this geometric interpretation of temperature. Until recently, it appeared as though the temperature/geometry equivalence held in all string theories, but it appears to be broken for the heterotic string. We shall show this breaking by considering the SO(32) heterotic string in ten dimensions.The breaking of the geometric/finite temperature correspondence in the context of the heterotic string, leads to two different philosophical approaches when examining string systems at finite temperature. One approach is to discard the geometrical interpretation of temperature and ignore the string consistency conditions to follow the standard rules of statistical mechanics. This approach does not seem to lead to self-consistent string models. The second approach is to take the string consistency conditions as fundamental and explore their implications for systems at finite temperature. We shall examine some of the consequences of this approach.
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Sharma, Menika. "The structure of string theory at finite temperature." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/194717.

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This thesis deals with string theory at finite temperature. String theory has attracted considerable attention in recent years because of its ability to unify the fundamental forces and particles in nature and provide a quantized description of gravity. However, many aspects of this theory remain mysterious, including its behavior at high temperature. One guiding principle for finite temperature string theory is the observation that a quantum theory at finite temperature can be recast as a zero-temperature theory in which a Euclidean time dimension is compactified on a circle. This temperature/radius correspondence holds in quantum mechanics as well as quantum field theory, and is normally assumed to hold in string theory as well. However it was shown recently that this correspondence fails for a class of string theories, called heterotic strings. This motivates a search for an alternate way to restore this correspondence, as well as a reevaluation of the thermodynamic behaviour of other classes of string theories, namely Type~II and Type~I. We find that contrary to the established wisdom, all ten dimensional string theories have a similar behaviour at finite temperature. This also leads us to the conclusion that the Heterotic and Type~I theory behave in a dual way at finite temperature.
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Schmude, Johannes. "D-brane sources in supergravity and gauge/string duality at finite temperature." Thesis, Swansea University, 2010. https://cronfa.swan.ac.uk/Record/cronfa43146.

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Aflakpui, Godwin Kwaku Senanu. "Temperature, nitrogen nutrition and interactions between maize and Striga hermonthica." Thesis, University of Reading, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363898.

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Karra, Glykeria. "Production of defects at phase transitions." Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298337.

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Bragança, Eduardo André de Figueiredo. "Correntes induzidas e condensado fermiônico no espaço-tempo de uma corda cósmica." Universidade Federal da Paraíba, 2017. http://tede.biblioteca.ufpb.br:8080/handle/tede/9482.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
In this thesis, we investigate the e ect of the topology and the magnetic eld on the vacuum uctuations associated to bosonic and fermionic charged elds. Firstly, we analize the vacuum induced current densities for a bosonic eld in a (D+1)-dimensional cosmic string spacetime. For this analysis, we consider the presence of a magnetic eld along of the azimuthal and axial directions and that the z-axis is compacti ed to a circle of lenght L. This analysis is performed using the positive frequencies Wightman function, that is necessary to calculate the vacuum expectation values of the induced current densities. Our second investigation is related with fermionic elds. We investigate the expectation values of the fermionic condensate, h i, charge and current densities for a massive fermionic eld in thermal equilibrium with T temperature, with a nonzero chemical potential, . We consider the background of a (2+1)-dimensional conical spacetime and the presence of a magnetic eld in the cone apex. In this analysis, we consider two separeted cases. Firstly, we consider the case where j j 6 m and after that the case where j j > m.
Nesta tese, investigamos o efeito da topologia e de um campo magnético nas flu­tuações do vácuo associadas a campos bosônicos e fermiônicos carregados. Primeiramente, analisamos as densidades de correntes induzidas no vácuo para um campo bosônico em um espaço-tempo de uma corda cósmica com (D+1) dimensões. Para esta analise, consideramos a presença de um fluxo magnético ao longo das direções axial e azimutal e que o eixo z é com­pactificado em um circulo de comprimento L. Esta analise é realizada fazendo use da função de Wightman de frequências positivas, que é necessária para calcular os valores esperados no vácuo das densidades de correntes induzidas. Nossa segunda investigação é relacionada a campos fermiônicos. Investigamos os valores esperados do condensado fermiônico, (N), carga e densidades de corrente para u campo fermiônico massivo em equilíbrio térmico a uma temperatura T, e com um potencial químico não-nulo, µ. Consideramos um espaço-­tempo cônico em (2+1) dimensões na presença de um campo magnético no vértice do cone. Para esta analise, dois casos foram considerados separadamente. Primeiramente, considera­mos o caso em que |µ| < m, e ern seguida, o caso ern que 1p,1 > m.
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Silva, Daniela Kempf da. "Fases de stripes nos cupratos : um estudo do modelo t-J anisotrópico." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2003. http://hdl.handle.net/10183/2495.

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Neste trabalho realizamos um estudo de um buraco em um antiferromagneto, como parte de uma revisão de diferentes técnicas de abordagem das fases de “stripes” nos cupratos supercondutores. Estudamos a transição do formalismo de “strings” para um buraco no modelo t - Jz bidimensional, onde existe uma solução analítica, para a solução de pólaron de spin no modelo t - J isotrópico através da aproximação de Born auto-consistente. A forma funcional dos picos de quase-partícula, do peso espectral e do “gap” espectral foi investigada numericamente em detalhe, em função da anisotropia magnética. O movimento de um pólaron de spin na presença de uma parede de domínio antiferromagnética (ADW) em antifase, como uma realização da configuração de “stripes” nos planos CuO dos cupratos de baixa dopagem, também foi analisada.
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Davison, Richard A. "Excitations in holographic quantum liquids." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:3b1db914-709e-41ec-ba7c-c968cb87b752.

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In this thesis we review the gauge/gravity duality and how it can be used to compute the thermodynamic properties and low-energy excitations of holographic quantum liquids - strongly-interacting field theories with a non-zero density of matter. We then study in detail the charge density excitations of two such liquids, the D3/D7 theory and the RN-AdS₄ theory, by computing the poles of their charge density Green's functions, and their charge density spectral functions. Although it is not a Landau Fermi liquid, the charge density excitations of the D3/D7 theory display many of the same properties as one, including a collisionless/hydrodynamic crossover as the temperature is increased. In contrast to this, the charge density (and energy density) excitations of the RN-AdS₄ theory do not share these properties but behave in a way that cannot be explained by Landau's theory of interacting fermionic quasiparticles. This is consistent with other results which indicate that this is not a Landau Fermi liquid.
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Books on the topic "Temperature strings"

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Bianconi, A., and Naurang L. Saini. Stripes and related phenomena. New York: Kluwer Academic, 2002.

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1944-, Bianconi A., and Saini Naurang L. 1963-, eds. Stripes and related phenomena. New York: Kluwer Academic/Plenum Publishers, 2000.

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Iwahara, Yuji. King of thorn. Hamburg: Tokyopop, 2008.

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Iwahara, Yuji. King of thorn. Los Angeles, Calif: Tokyopop, 2008.

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Iwahara, Yuji. King of thorn. Los Angeles, Calif: Tokyopop, 2007.

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Iwahara, Yuji. King of thorn. Los Angeles, Calif: Tokyopop, 2008.

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Saini, Naurang L., and Antonio Bianconi. Stripes and Related Phenomena. Springer, 2013.

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Stringer, John, MATERIALS SOLUTIONS CONFERENCE, P. F. Tortorelli, P. Y. Hou, JOHN STRINGER SYMPOSIUM ON HIGH TEMPERAT, and Ian G. Wright. John Stringer Symposium on High Temperature Corrosion. ASM International, 2003.

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(Editor), Antonio Bianconi, and Naurang L. Saini (Editor), eds. Stripes and Related Phenomena (Selected Topics in Superconductivity Volume 8). Springer, 2001.

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Xu, Jiuping, and Zezhong Wu. Tubular String Characterization in High Temperature High Pressure Oil and Gas Wells. Taylor & Francis Group, 2018.

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Book chapters on the topic "Temperature strings"

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Guo, Xiaoqiang, Jun Liu, Liming Dai, and Xiaohong Zhang. "3D Nonlinear Flow-Induced Vibration Model of Tubing Strings in High-Pressure, High-Temperature, and High-Yield Curved Gas Wells." In New Perspectives on Nonlinear Dynamics and Complexity, 63–87. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-97328-5_5.

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Ebner, R., M. Mantler, and F. Weber. "The Temperature Profiles Along Heating-Strips in High Temperature Chambers for XRD." In Advances in X-Ray Analysis, 403–10. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4615-2972-9_46.

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Öztaş, A. M., Y. Gündüç, and T. Çelik. "A Finite Temperature String Phase Transition a la Volume Exclusion." In Hot Hadronic Matter, 161–64. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-1945-4_17.

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King, H. W., E. A. Payzant, and M. B. Stanley. "Disposable Heater Strips for High Temperature Powder Diffractometer Furnaces." In Advances in X-Ray Analysis, 433–37. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4615-2972-9_49.

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Xi, Yan, Jun Li, Yang Yu, Zongyuan Li, and Bowen Mei. "Coupling Effect of Transient Temperature-Pressure on Casing String During Volume Fracturing in Shale Gas Wells." In Lecture Notes in Mechanical Engineering, 985–1000. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0107-0_95.

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Życzyńska-Baloniak, Irena, Barbara Szpakowska, Lech Ryszkowski, and Janusz Pempkowiak. "Role of meadow strips for migration of dissolved organic compounds and heavy metals with groundwater." In Nutrient Dynamics and Retention in Land/Water Ecotones of Lowland, Temperate Lakes and Rivers, 249–56. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1602-2_27.

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Scheel, Michael, Jens P. Dreier, and G. Bohner. "Evaluation of Intracranial Electrocorticography Recording Strips and Tissue Partial Pressure of Oxygen and Temperature Probes for Radio-Frequency-Induced Heating." In Cerebral Vasospasm: Neurovascular Events After Subarachnoid Hemorrhage, 149–52. Vienna: Springer Vienna, 2012. http://dx.doi.org/10.1007/978-3-7091-1192-5_29.

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Azevedo, Adriana S., João P. Firmo, João R. Correia, and Carlos Tiago. "Influence of Elevated Temperatures on the Bond Between CFRP Strips and Concrete Using the NSM Technique – Definition of Local Bond vs. Slip Laws." In Lecture Notes in Civil Engineering, 300–311. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-88166-5_25.

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BAKAS, I., A. BILAL, J. P. DERENDINGER, and K. SFETSOS. "SUPERSYMMETRY AND FINITE-TEMPERATURE STRINGS." In The Ninth Marcel Grossmann Meeting, 1114–20. World Scientific Publishing Company, 2002. http://dx.doi.org/10.1142/9789812777386_0178.

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"Wellbore Temperature Profiles in Multiple Strings." In Fluid Flow and Heat Transfers in Wellbores, 185–95. Society of Petroleum Engineers, 2018. http://dx.doi.org/10.2118/9781613995457-08.

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Conference papers on the topic "Temperature strings"

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Angelle, Jeremy R., Robert L. Thibodeaux, Roger A. Norman, Seth J. Fadaol, Taylor D. Snell, and Logan E. Smith. "Holistic Approach to Mitigating Well Integrity Risk in Deepwater Surface Casing Strings in All Phases of Execution." In Offshore Technology Conference. OTC, 2022. http://dx.doi.org/10.4043/31907-ms.

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Abstract As well construction progressed into increasingly deeper water depths targeting deeper reservoirs, surface casing strings became exposed to additonal risks during various phases of execution and well design requirements. Beginning with handling and installation, they are subjected to handling and environmental loads from various metocean conditions. Once set in place, they see increased exposure to higher well and structural loads while being subjected to deeper hole sections before additional casing strings are set in place. Deepwater casing strings are installed prior to the drilling riser being installed, which creates additional exposure to loads and risks not seen by other casing strings as well as loads induced by the well. To ensure the casing string is fit for duty, a "cradle to grave" approach is utilized to identify and classify the risks created by loads induced on the casing string. Each risk is analyzed and mitigated with a technological solution or best practice to ensure the design parameters of the well are achieved. Introducing advanced mechanized tubular running technologies resulted in up to 20% reduction in exposure of the surface casing string to dangerous seastates and ocean currents and a 41% reduction in red zone entries. Exposure of the surface casing string to environmental loads was further reduced by 7% with the use of an innovative hands-free anti-rotation key, which requires no installation on the rig floor during tubular handling operations and lowers red zone entries beyond current mechanized handling solutions. Once set in place, surface casing strings are subjected to a higher classification of well service as structural and well loads increase in severity. To address this, a new weld-on connector qualified to connection assessment level I+ for gas tight service with elevated temperature per API RP 5C5 / ISO 13679 was installed, allowing deeper wells in deeper waters to be achieved. It is sometimes necessary to temporarily protect the well with deeper hole sections exposed to the surface casing string. Additional challenges to effectively seal the well are present when the string contains internal weld seams and inside diameter restrictions such as the high-pressure wellhead housing and supplemental casing adapters. To overcome these challenges, a unique retrievable packer system was developed and validated to API 11D1 and ISO 14310, allowing well protection from the surface casing string and below.
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Celsa, Giovanni, and Giuseppe Marco Tina. "Matlab/Simulink model of photovoltaic modules/strings under uneven distribution of irradiance and temperature." In 2015 Sixth International Renewable Energy Congress (IREC). IEEE, 2015. http://dx.doi.org/10.1109/irec.2015.7110944.

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Setiawan, Toto, Sharon Ellen Lidwin, Gan Teik Wei, Sukarmen Wargo Widodo, Ronfernandez Sandanasamy, Tribor Rakela, Sundaresh Sundaralingam, Leidy Pitre Granados, and Juan Cortez Vaca. "Identification of Shallow Gas Leaks Through Multiple Strings Using Slickline With Fiber-Optic Distributed Temperature Sensing." In IADC/SPE Asia Pacific Drilling Technology Conference. Society of Petroleum Engineers, 2016. http://dx.doi.org/10.2118/180665-ms.

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Baharum, Zurailey Bin, Marvin Rourke, Alan Aulia Muhadjir, Widyanto Andono, Eva Sarah Binti Zakaria, Suzie Binti Hamzah, Noor Rohaellizza Binti Hademi, and Nurul Aida Binti Hamdan. "Efficient and Comprehensive Integrity Diagnostics for Dual Completion String Wells, Using Spectral Noise Analyzer Tool." In Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/207814-ms.

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Abstract Well operators often face various technical challenges when intervening and repairing older, mature field wells. The most common problem associated with aging wells are tubing and casing integrity. Uncertain sources of downhole leaks and data ambiguity often lead to incorrect diagnostics that can hinder repair work or even contribute to additional or worsened integrity issues. Operators continuously challenge service companies and technology providers to drive innovation. One such challenge is in finding efficient and comprehensive integrity diagnostics for dual-string wells. A basic and general diagnostic method to verify well integrity in dual-string wells involves setting plugs in the long and short strings and pressure testing the tubings. These operations are generally time consuming, and the test data does not usually pinpoint the location of the leak, if any. Since 2016 a new diagnostic solution for this challenge has been implemented using a slickline-deployed passive acoustic logging technique. Carefully designed intervention planning, combined with efficient data acquisition, led to significant time saving and improved data quality. A more complete assessment of the integrity of both strings is now more frequent and often necessary, while challenging the conventional thinking of having to assess the lower string only while assuming the upper string is in good condition. However, investigating dual-string integrity with uncertainty on the source of leak, restrictions on facilities and limitations on surveillance time will often waste more time and money if not approached carefully. This paper discusses two case studies, including a dual-string oil producer in the South China Sea that had sustained pressure in production casing annulus. The well operator initially considered that the long string had an integrity issue, while the short string did not, based on their surface-based annulus pressure diagnostics. Consequently, the operator decided to diagnose only the long string. The passive acoustic memory tool. combined with a fast-response temperature and spinner used for the diagnosis, identified a possible short string leak while logging through the long string. This result clearly demonstrated that surface analyses can be misleading, and a comprehensive downhole diagnostic should be the recommended method to identify leaks, especially in dual-string completions. This well operator has completed more than 100 integrity diagnostic runs in the last five years. The passive acoustic diagnostic interventions have resulted in an average 50-percent time saving compared to legacy methods, and data analysis results have led to significant improvements in well productivity.
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Shust, William, David Read, and F. Brent Jury. "A Novel Method for Estimating the Neutral Temperature of Continuously Welded Rail." In ASME 2007 Rail Transportation Division Fall Technical Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/rtdf2007-46023.

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Traditionally, railroad track is installed so that rails that are welded together into strings longer than 400 feet experience no longitudinal thermal force at rail temperatures of 90 to 115 degrees °F. This rail temperature at which the thermal force is zero is commonly referred to as the rail’s neutral temperature. Rail at temperatures higher than the neutral temperature are in a state of compression, and in cooler temperatures are in tension. Except for the textbook case of a perfectly straight rail, these longitudinal forces must be reacted along the length of the rail via friction and the rail fasteners. A new device is designed to exploit changes in vibration of the rails within these fastenings and yield a non-destructive estimate of the installed neutral temperature. This paper will report on various on-track tests conducted at the Transportation Technology Center, Inc. (TTCI) in Pueblo, CO. This behavior was first noted empirically, without a background engineering mechanics outline. Similarly, this paper will follow the same evolution. After presentation of test data, engineering explanations will follow using theory and mechanical modeling.
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Vasper, Adam C., and Ingvild Bakke Fagereng. "Temperature Specifications for CCUS Completions Equipment: Steady-State and Transient Thermal Simulations." In SPE EuropEC - Europe Energy Conference featured at the 83rd EAGE Annual Conference & Exhibition. SPE, 2022. http://dx.doi.org/10.2118/209637-ms.

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Abstract Different simulated injection scenarios can significantly cool carbon capture utilization and storage (CCUS)wells. Cases representing different scenarios were modeled to help determine appropriate temperature specifications for completions equipment in CCUS wells. Depleted reservoirs, in particular gas reservoirs, will not support a static column of liquid or dense-phase CO2 to surface at the initial reservoir pressure. During injection, unless there is significant friction or backpressure, the upper part of the well will be at low pressure, with CO2 in the gas phase. Injected, liquid CO2 will depressurize across the wellhead choke, or the upper tubing, resulting in significant cooling as the saturation curve is reached and the CO2 starts flashing. For steady-state injection across a narrow range of rates, a tapered or narrow completion string can be designed that provides sufficient friction pressure to keep the CO2 in the liquid phase. A portfolio or set of wells, potentially with different tubing sizes, will give more flexibility for managing injection rates. Transient scenarios such as injection startup or shutdown cause rapid changes in rate and can consequently induce severe thermal shocks. These cannot be completely prevented using only friction or passive downhole devices. Many completion options have been proposed to provide flexibility for injection rate changes and/or reservoir pressure increases. These include concentric or dual strings providing multiple flow paths with different flow areas and hence friction, downhole passive chokes, backpressure control valves, surface-operated downhole flow control valves, and various combinations of these and other technologies. Currently, the only methods to eliminate all the scenarios consideredmay be (active) backpressure control and surface-controlled downhole flow control valves. Whereas the transient effects are most severe in depleted reservoirs, they are also shown to occur in reservoirs approaching hydrostatic pressure. The most important component in the completion string is arguably the subsurface safety valve (SSSV). API 14B specifies a maximum leak rate for the closed SSSV. Following a blowout or depressurization event, a leak of high-pressure, liquid CO2 from below the SSSV to low-pressure, gas-phase CO2 above will cause localized cooling at the SSSV, in addition to that caused by the initial depressurization condition. Modeling included simulations of blowout and subsequent SSSV leakage phases for different periods of injection and hence reservoir cooldown. To quantify these effects, the work considered temperatures in the different radial sections of the well versus time and depth. Sensitivities on annulus fluid, reservoir properties including pressure and permeability, the rate of mass transfer between phases, and other variables were also investigated. Modeling was performed using a commercial dynamic multiphase flow simulator.
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Fu, Jin, Xi Wang, Guobin Yang, Shunyuan Zhang, Chen Chen, and Haochen Han. "An Intelligent Completion and Artificial Lift Technology to Develop Large Carbonate Reservoirs: Novel Completion and Zonal Water Injection via Remote Control Methods to Develop Horizontal Wells." In SPE Trinidad and Tobago Section Energy Resources Conference. SPE, 2021. http://dx.doi.org/10.2118/200915-ms.

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Abstract There are several large carbonate reservoirs that have drawn great attention of researchers in recent years. After optimization of drilling technologies, how to deploy artificial lift technologies to develop them more efficiently is another concern. Conventional zonal water injection technologies require repetitive operation with wirelines and cables, causing extensive tests and low efficiency. However, an intelligent zonal water injection string consisting of several preset cable packers, water injection pressure gauges, formation pressure gauges and downhole flow meters has simply optimized water injection parameters and efficiently developed all reservoirs in some China's mature oilfields, especially when the string is integrated with remote monitoring and control methodologies. With the rapid development of horizontal drilling and extended reach well drilling technologies, borehole conditions are becoming more and more complicated, which has brought more challenges to water adsorption testing of horizontal intervals and deployment of zonal water injection instruments. Compared with vertical wells, the water adsorption test and string running are more challenging for horizontal wells, in which we are faced by many a problem during zonal water injection, such as competitive slack off and tight pull, excessive or inadequate water injection, complicated operation process. Besides, well deviation, dog leg and horizontal section length shall be all taken into consideration during zonal water injection for horizontal wells. Therefore, novel strings and tools should be deployed. Now tight pull, slack off and long operation periods are common problems during zonal water injection of horizontal intervals. After dedicated research, a set of wireless intelligent water injection strings for horizontal wells has been invented. Based on pressure pulse water distribution technique, the water injection string is eligible for 32-stage adjustment, so one strip may accomplish testing, adjusting, injection, measurement and downhole data collection, in addition to automatic error correction during water injection. The field trial shows that this novel string may be tripped in and out smoothly, packers are set securely and released easily, in order to adjust opening of each water injection nozzle in the ground, with an error of no more than ±10%. Therefore, the novel completion and water zonal water injection string is capable of injecting water precisely via remote control methods. The wireless intelligent water injection string for horizontal wells that combines testing, adjusting, injection, measuring and data collection in one trip provides us with many downhole data, such as pressure, flow rate, temperature and so on. Therefore, water injection volume for each zone is monitored and controlled down hole. This technology is applicable for both horizontal and vertical wells that require zonal water injection.
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Zeng, Zezhi, Gopinath Warrier, and Y. Sungtaek Ju. "Flow and Heat Transfer in Liquid Films Flowing Over Highly Curved Surfaces." In ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems collocated with the ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ipack2015-48149.

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Large-scale evaporative cooling is one of the leading sources of fresh water consumption. Dry cooling based on existing heat exchangers, however, has found limited usage due to the high cost and large foot prints/weights. Development of alternative low-cost light-weight heat exchangers for dry cooling is therefore urgently needed. One promising design for such alternative heat exchangers is what we call Direct-contact Liquid-on-String Heat Exchangers (DILSHE). DILSHE consists of a vertically aligned array of inexpensive polymer strings. A nonvolatile liquid flows over the strings, forming thin liquid films. Large surface areas provided by these films enable efficient heat transfer to counter-flowing cooling air. Physics-based design and optimization of DILSHE requires rigorous understanding of flow and heat transfer phenomena of falling liquid films on highly curved surfaces. Formation of travelling beads through the Rayleigh-Plateau or Kapitza instability can enhance heat transfer across liquid-gas interfaces. We have developed a numerical model for liquid-gas flows and heat transfer in the drop-like regime, where the Rayleigh-Plateau instability dominates and the shape of travelling beads is governed mainly by the influence of surface tension. We solve the Young-Laplace equation to obtain the liquid bead shape, which was then used to construct a finite element model. The time-dependent Navier-Stokes equation and the energy equation were then solved to obtain velocity and temperature distributions in the liquid and the surrounding counter-flowing air. The temporal and spatial variations in the temperature of travelling beads are analyzed to evaluate the effective heat transfer coefficients, which are key input parameters for an overall heat exchange model to quantify the heat transfer characteristic of DILSHE. The present work helps build foundation for systematic design of new generations of heat exchangers for dry cooling.
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Sorensen, Ole, Yang Wu, Didier Caillon, Bjorn Viguerie, Rao Shafin Ali Khan, Nestor Molero, Ernesto Franco Delgado, et al. "Successfully Adapting and Overcoming Challenges for Coiled Tubing Applications in High-Pressure Sour Environment and Horizontal Unconventional Tight Gas Wells in UAE." In SPE/ICoTA Well Intervention Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/209032-ms.

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Abstract During the completion phase of four unconventional wells in the United Arab Emirates (UAE), a detailed engineering approach enabled overcoming challenges presented by the extreme conditions of pressure, temperature, and sour environment across long horizontal sections to successfully carry out cleanout activities. The methods implemented to address those conditions prioritized personnel safety and asset integrity. The unconventional wells in this campaign were characterized by a reservoir pressure of approximately 13,000 psi and a bottomhole temperature of approximately 325°F. Gas was expected as reservoir fluid. The environment was sour, with 5% mol of H2S and 5% mol of CO2. After fracturing, the shut-in pressure was approximately 8,000 psi. Those conditions triggered a new engineering approach to design a customized coiled tubing (CT) pipe that could reach depths of 20,700 ft and perform efficient cleanouts. Other considerations included the selection of the appropriate pressure control equipment (PCE), downhole tools, and intervention fluids that could withstand the harsh working conditions. The wells were completed with 5 1/2-in. fracturing strings; horizontal sections ranged from 5,000 to 8,200 ft. Each of the 95 fracturing stages was isolated by dissolvable plugs. The CT pipe design considered well trajectories, working pressures, and downhole environment. The highly engineered 22,000 ft, 2 3/8-in. CT string was manufactured with quench and tempered (Q&T) material with yield strength of 110,000 psi. A custom-fit CT string integrity program was implemented to ensure safe intervention in high-pressure sour environment. Pipe life was then monitored in real time using magnetic flux leakage. Downhole tools (CT connector and check valves) and the PCE stack were designed to hold pressures up to 15,000 psi. The PCE configuration was thoroughly reviewed, and since the wellhead stack exhibited a maximum height of approximately 120 ft, a stack stress analysis through finite-element modeling software was conducted to validate structure stability, to confirm forces and bending moments remained within safe working limits, and to determine the optimal setting for guy wires. Job execution highlighted challenges linked to the high-pressure cycling and the need to optimize the number of achievable sweeps in the horizontal section. Well trajectories also proved challenging for the cleanout, with solids accumulation in specific intervals. This operation, the first of its kind in the country for the operator, yielded lessons for design considerations and the execution process and recommendations for CT intervention in similar working environments. It also confirms that 110,000-psi yield strength Q&T CT strings can be safely deployed in a high-pressure sour environment by implementing proper risk mitigation strategies.
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Pimenta, Gervasio, Mohamad Hussain Ahmad, Akio Mizukami, and Bogdan Andres. "GRE Lined OCTG as a Cost-Effective Solution for Water Disposal Wells." In Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/207335-ms.

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Abstract Glass Reinforced Epoxy (GRE), lining systems for API 5CT tubing have gained prominence in O&G industry, essentially due to the fact that GRE constitutes a physical barrier protecting the OCTG pipe from corrosive environment, and minimizing issues with scale deposition. ADNOC group companies have been building experience on the implementation of GRE Lined L-80 tubing by successfully using it in produced water disposal wells. Produced water is a highly corrosive medium due to dissolved CO2, H2S high to very high chloride content, high TDS, eventually containing bacteria. The corrosiveness of the fluid increases as the temperature increase from temperatures in the range of 30 – 50 degC at surface to reservoir temperature. The aggressiveness of this medium towards API 5CT L-80 or 13Cr / modified 13Cr increases with its contamination with oxygen. Dissolved oxygen is a strong depolarizer leading to high pitting rates if dissolved O2 content in the water is above 10 or 20ppb. Conventional completion of WDW in ADNOC Onshore is based on API 5CT L-80, and short life of the completion strings has been attributed to deficient water treatment (lack of oxygen scavenger, corrosion inhibitor unsuitable for downhole conditions. A life cycle cost analysis suggests that GRE lined OCTG could be a cost-effective solution for water injection. For this life cycle cost assessment, CAPEX (cost of L-80 completion string, combo corrosion inhibitor & oxygen scavenger skid and OPEX: cost of Combo chemical and monitoring activities for design life were considered, while achieving the required level of well integrity and lower operational safety risks (e.g. handling hazardous chemicals, monitoring activities)
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Reports on the topic "Temperature strings"

1

Szakaly, F. J., T. K. Kim, and T. A. Taiwo. Neutronic assessment of stringer fuel assembly design for liquid-salt-cooledvery high temperature reactor (LS-VHTR). Office of Scientific and Technical Information (OSTI), September 2006. http://dx.doi.org/10.2172/895665.

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