Relevant bibliographies by topics / Competing phases

Academic literature on the topic 'Competing phases'

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Published: 11 March 2023

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Journal articles on the topic "Competing phases"

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Stroppa, Alessandro, and Maria Peressi. "Competing magnetic phases of Mn5Ge3compound." physica status solidi (a) 204, no. 1 (January 2007): 44–52. http://dx.doi.org/10.1002/pssa.200673014.

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Ranjan, Rajeev, Sanjay Singh, Hans Boysen, Dmytro Trots, S. Banik, A. M. Awasthi, P. K. Mukhopadhyay, and S. R. Barman. "Competing tetragonal and monoclinic phases in Ni2.2Mn0.80Ga." Journal of Applied Physics 106, no. 3 (August 2009): 033510. http://dx.doi.org/10.1063/1.3190527.

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Carmier, Pierre, Oleksii Shevtsov, Christoph Groth, and Xavier Waintal. "Competing topological phases in few-layer graphene." Journal of Computational Electronics 12, no. 2 (April 11, 2013): 175–87. http://dx.doi.org/10.1007/s10825-013-0454-y.

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Alekseechkin, N. V. "On calculating volume fractions of competing phases." Journal of Physics: Condensed Matter 12, no. 43 (October 9, 2000): 9109–22. http://dx.doi.org/10.1088/0953-8984/12/43/301.

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Sharma, Yogesh, Martin V. Holt, Nouamane Laanait, Xiang Gao, Ilia N. Ivanov, Liam Collins, Changhee Sohn, et al. "Competing phases in epitaxial vanadium dioxide at nanoscale." APL Materials 7, no. 8 (August 2019): 081127. http://dx.doi.org/10.1063/1.5115784.

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Alekseechkin, N. V. "On calculation of volume fractions of competing phases." Physics of the Solid State 42, no. 7 (July 2000): 1354–60. http://dx.doi.org/10.1134/1.1131392.

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Nadeem, M., M. Arshad Farhan, and M. Atif. "Time dependant switchover of competing phases in La0.40Pr0.10Ca0.50MnO3." Materials Letters 169 (April 2016): 107–9. http://dx.doi.org/10.1016/j.matlet.2016.01.113.

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Wang, Chaonan, Liudong Xing, and Gregory Levitin. "Competing failure analysis in phased-mission systems with functional dependence in one of phases." Reliability Engineering & System Safety 108 (December 2012): 90–99. http://dx.doi.org/10.1016/j.ress.2012.07.004.

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Dzhumanov, S., and U. T. Kurbanov. "The coexisting of insulating and metallic/superconducting phases and their competing effects in various underdoped cuprates." Modern Physics Letters B 32, no. 26 (September 20, 2018): 1850312. http://dx.doi.org/10.1142/s0217984918503128.

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We show that the unconventional electron–phonon interactions and polaronic effects, charge inhomogeneity and charge ordering in underdoped cuprates result in the nanoscale phase separation and the occurrence of competing and coexisting of insulating and metallic/superconducting phases. We identify possible types of localized and mobile charge carriers in these systems, which segregate into insulating (carrier-poor) and metallic/superconducting (carrier-rich) regions as a result of their specific ordering. We found that the coexistence of two competing insulating and metallic phases can persist in the lightly doped cuprates on a local scale, while the coexistence of three competing insulating, metallic and superconducting phases is expected in the underdoped cuprates on a global scale. We demonstrated that the competing effects of these coexisting insulating and metallic/superconducting phases are manifested in the unusual temperature dependences of the magnetic susceptibility and resistivity and in the suppression of superconductivity in various underdoped cuprates.
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Markiewicz, R. S., J. Lorenzana, G. Seibold, and A. Bansil. "Competing phases in the cuprates: Charge vs spin order." Journal of Physics and Chemistry of Solids 72, no. 5 (May 2011): 333–36. http://dx.doi.org/10.1016/j.jpcs.2010.10.001.

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Dissertations / Theses on the topic "Competing phases"

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Sahebsara, Peyman. "Competing phases in strongly correlated electron systems with frustration." Thèse, Université de Sherbrooke, 2008. http://savoirs.usherbrooke.ca/handle/11143/5104.

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In this thesis we use the Variational Cluster Approximation (VCA) in the investigation of broken symmetry states of strongly correlated systems with frustration. Layered organic compounds, in which dimers of organic molecules form an anisotropic triangular lattice, are among materials that show this frustration. We discuss the two-dimensional one-band Hubbard model used for studying these compounds. Then we introduce VCA, which allows to study ordered phases by a variational principle based on the electron self-energy. We explain the computational methods that we used in conjunction with VCA. A comparison of the normal state and Néel antiferromagnetic ordered phase energies enables us to conclude that this order is dominant at large values of U, below some critical value of frustration (t'/t ). By observing the saturation of the order parameter, we argue that U [greater or approximately equal to] 8 is already in the strong coupling limit. d -wave superconductivity is discussed in relation with cluster and lattice point group symmetries. The two different pairings, d[subscript x[superscript 2]]-[subscript y[superscript 2]] and d[subscript xy] , are studied separately. A comparison of the energies of the antiferromagnetic and superconducting phases shows that while d -wave superconductivity dominates the antiferromagnetic phase, the d[subscript x[superscript 2]]-[subscript y[superscript 2]] order exists at intermediate U and d[subscript xy] is dominant at low values of U. We found no evidence of homogeneous coexistence of antiferromagnetic and d -wave superconducting phases. In addition, we investigate a spiral magnetic order on the isotropic triangular lattice, where no Néel antiferromagnetic order is found. By looking at the density of states, we see that the system is metallic at weak coupling. For U [greater or approximately equal to] 6 until a value in the range [8,12), we find an insulating phase, without long-range order, which we conjecture to be a spin liquid phase. This spiral order is found at stronger coupling.
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Farias, Carlene Paula Silva de. "Competing orders in Uru2Si2: from ordered magnetism to spin liquid phases." PROGRAMA DE P?S-GRADUA??O EM F?SICA, 2017. https://repositorio.ufrn.br/jspui/handle/123456789/23653.

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The main objective of this thesis is to investigate the competing ordered phases in the metallic heavy fermion compound URu2Si2, which displays a bodycentered tetragonal lattice. We first provide a study case of the competition between antiferromagnetic (AF) and spin liquid phases. The antiferromagnetic state is study with spin-wave theory. Whereas the spin liquid analysis has been carried out in an algebraic spin liquid representation. In the second part, we describe an effective theory for Raman scattering experiments at these particular phases. We provide insight about the hidden order phase displayed by the heavy fermion compound URu2Si2.
L?objectif central de cette th?se est d??tudier des phases ordonn?es en comp?tition dans des mat?riaux magn?tiques pr?sentant une structure cristalline t?tragonale centr?e. Ce travail est divis? en deux parties principales. Dans la premi?re, nous pr?sentons les r?sultats de notre ?tude de la comp?tition entre des ?tats ordonn?s antiferromagn?tiques et des phases liquides de spin. Nous montrons comment ces derni?res peuvent ?tre stabilis?es par la frustration g?om?trique et par une g?n?ralisation de la sym?trie de spin au groupe SU(n). Les ?tats antiferromagn?tiques sont d?crits par une th?orie d?onde de spin et l?analyse de liquide de spin est effectu?e par une repr?sentation fermionique des op?rateurs de spin. Dans la deuxi?me partie, nous d?crivons une th?orie effective pour d?rcrire des exp?riences de diffusion Raman. Nous fournissons un aper?u de la phase d?ordre cach? affich?e par le compos? de fermions lourds URu2Si2.
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Silva, de Farias Carlene Paula. "Competing Orders in URu2Si2 : from ordered magnetism to spin liquid phases." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0569/document.

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L’objectif central de cette thèse est d’étudier des phases ordonnées en compétition dans des matériaux magnétiques présentant une structure cristalline tétragonale centrée.Ce travail est divisé en deux parties principales. Dans la première, nous présentons les résultats de notre étude de la compétition entre des états ordonnés antiferromagnétiques et des phases liquides de spin. Nous montrons comment ces dernières peuvent être stabilisées par la frustration géométrique et par une généralisation de la symétrie de spinau groupe SU(n). Les états antiferromagnétiques sont décrits par une théorie d’onde despin et l’analyse de liquide de spin est effectuée par une représentation fermionique des opérateurs de spin. Dans la deuxième partie, nous décrivons une théorie effective pour dércrire des expériences de diffusion Raman. Nous fournissons un aperçu de la phase d’ordre caché affichée par le composé de fermions lourds URu2Si2
The main objective of this thesis is to investigate the competing ordered phases in the metallic heavy fermion compound URu2Si2, which displays a body-centered tetragonallattice. We first provide a study case of the competition between antiferromagnetic(AF) and spin liquid phases. The antiferromagnetic state is study with spin-wave theory. Whereas the spin liquid analysis has been carried out in an algebraic spin liquid representation.In the second part, we describe an effective theory for Raman scattering experiments at these particular phases. We provide insight about the hidden order phase displayed by the heavy fermion compound URu2Si2
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Coslovich, Giacomo. "Disclosing the ultrafast dynamics of competing phases in high - temperature superconductors by time - resolved optical spectroscopy." Doctoral thesis, Università degli studi di Trieste, 2011. http://hdl.handle.net/10077/4511.

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2009/2010
Understanding the interplay between the phases present in a high-temperature superconductor (superconducting, pseudogap, strange metal and Fermi-liquid-like) is the key-concept for shining light on the nature of the superconductivity mechanisms in copper-oxide based superconductors. Here, I set the bases for addressing this physics by developing an approach based on ultrafast time-resolved optical spectroscopy in the infrared and visible spectral regions. The experiments performed disclose the real-time evolution of the optical properties while the system is suddenly brought out-of-equilibrium by an ultrashort laser pulse. The data obtained show how a competing admixture of two or more phases in a high-temperature superconductor can be created and observed evolving. Finally by using new models for interpreting the experimental results the ultrafast dynamics of the competing phases start to be revealed.
XXIII Ciclo
1982
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Böhmer, Anna Elisabeth [Verfasser], and H. von [Akademischer Betreuer] Löhneysen. "Competing Phases in Iron-Based Superconductors Studied by High-Resolution Thermal-Expansion and Shear-Modulus Measurements / Anna Elisabeth Böhmer. Betreuer: H. v. Löhneysen." Karlsruhe : KIT-Bibliothek, 2014. http://d-nb.info/1056955880/34.

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Amin, Shara Jalal. "Studies of competing interactions in hydrogen bonded systems." Thesis, University of Edinburgh, 1988. http://hdl.handle.net/1842/11976.

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Jahn, Sandro. "The atomic dynamics of liquids with competing interactions." Doctoral thesis, [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=968854303.

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Pandit, Shubhrangshu. "Velocity map imaging studies of competing dynamics in the gas phase." Thesis, University of Bristol, 2017. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.715743.

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Li, Qi 1976. "Competing orders in s-wave and p-wave superconductors." Thesis, University of Oregon, 2008. http://hdl.handle.net/1794/8285.

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xiii, 110 p. A print copy of this thesis is available through the UO Libraries. Search the library catalog for the location and call number.
This dissertation investigates the interplay between, and the possible coexistence of, magnetic and superconducting order in metals. We start with studying the electromagnetic properties of s-wave superconductors near a ferromagnetic instability. By using a generalized Ginzburg-Landau theory and scaling arguments, we show that competition between magnetic order and superconducting order can change the scaling of observables. For instance, the exponent for the temperature dependence of the critical current can deviate from the Ginzburg-Landau value of 3/2. These results may be relevant to understanding the observed behavior of MgCNi 3 . We then study the nature of the superconductor-to-normal-metal transition in p-wave superconductors. Although the phase transition is continuous at a mean- field level, a more careful renormalization-group analysis in conjunction with large-n expansion techniques strongly suggest that the transition is first order. This conclusion is the same as for s-wave superconductors, where these techniques also predict a first-order transition. In p-wave superconductors, topological excitations known as skyrmions are known to exist in addition to the more common vortices. In the third part of this dissertation, we study the properties of skyrmion lattices in an external magnetic field. We propose iv experiments to distinguish vortex lattices from skyrmion lattices by means of their melting curves and their μSR signatures.
Adviser: Dietrich Belitz
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Wheater, Rhys. "Phase behaviour of colloidal fluids with competing attractive and repulsive effective potentials." Thesis, University of Bath, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.707567.

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For some time it was believed that simple, single - component, fluid phase behaviour was limited to a homogeneous gas and homogeneous liquid phase separated by a line of first order phase transitions. However, recent studies have demonstrated that simple fluid behaviour can be extended to richer phase diagrams through tuning of the effective potential. Fluids whose constituent particles feel a strong attraction at close range and weak repulsion at longer ranges have been shown, under certain conditions, to assemble into heterogeneous structures such as spherical and cylindrical clusters, lamellae and spherical and cylindrical voids. Lattice Monte Carlo simulations are used to explore the phase diagram of a single - component fluid following a hard - core effective potential with an attractive and a repulsive Yukawa tail. The relative strngths of attractive and repulsive potentials are found for which heterogeneous structures become stable. Then the region of stability of heterogeneous structures is delimited through the use of histogram reweighting to map out the locus of points at which the homogeneous and heterogeneous states have equal free energy. A transition matrix Monte Carlo biasing technique is used to reveal the system behaviour inside the free energy barrier at low temperatures, when the gas - liquid phase transition appears to have re-asserted itself. Finally, a discussion as to the mechanism for assembly of the heterogeneous structures is offered.
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Books on the topic "Competing phases"

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Riste, Tormod. Phase Transitions and Relaxation in Systems with Competing Energy Scales. Dordrecht: Springer Netherlands, 1993.

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Riste, Tormod, and David Sherrington, eds. Phase Transitions and Relaxation in Systems with Competing Energy Scales. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1908-5.

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LeSar, Richard. Competing Interactions and Microstructures: Statics and Dynamics: Proceedings of the CMS Workshop, Los Alamos, New Mexico, May 5-8, 1987. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988.

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1953-, Lesar R., Bishop A. 1947-, and Heffner R. 1942-, eds. Competing interactions and microstructures: Statics and dynamics : proceedings of the CMS Workshop, Los Alamos, New Mexico, May 5-8, 1987. Berlin: Springer-Verlag, 1988.

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Modern Eventing With Phillip Dutton The Complete Resourcetraining Conditioning And Competing In All Three Phases. Trafalgar Square Publishing, 2013.

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Phase transitions and relaxation in systems with competing energy scales. Dordrecht: Kluwer Academic Publishers, 1993.

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Ogburn, Dennis. Chinchaysuyu and the Northern Inca Territory. Edited by Sonia Alconini and Alan Covey. Oxford University Press, 2018. http://dx.doi.org/10.1093/oxfordhb/9780190219352.013.36.

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Based on available archaeological and ethnohistorical data, this chapter examines the nature of Inca presence in the norther portion of the empire. Located in present-day Ecuador, this region had a singular importance in the last phases of Inca imperial expansion. This contribution provides an overview of the Inca occupation and the different forms of integration that the populations dwelling in the sierra, coast, and tropical oriente experienced. The discussion also highlights the importance of the Inca centers of Tomebamba and Quito in the imperial politics, and the system of defensive fortifications along the imperial frontiers. It also discusses the complex relations that the Inca established with competing polities like the Caranqui and Cañari among many others. Altogether, this illustrates the complexity of the complexity of the Inca conquest in the Northern region, and the remaining work to be done in the future.
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Lesar, R., and A. Bishop. Competing Interactions and Microstructures: Statistics and Dynamics (Springer Proceedings in Physics). Springer-Verlag, 1988.

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Mitrović, Moreno. Configurational change in Indo-European coordinate constructions. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198747307.003.0002.

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This chapter presents a case study of word order change in coordinate constructions across a wide range of Indo-European languages. Early Indo-European languages had two available patterns of coordination at their disposal: one in which the coordinating particle was placed in first and another in which it was placed in the second position with respect to the second coordinand (‘Wackernagel effect’). Diachronically, the two competing configurations reduce to a single winning one, namely the head-initial one that all contemporary Indo-European languages retained. This is accounted for as the result of the loss of ‘Wackernagel movement’ and the development of a lexicalized J(unction)-morpheme. Resting on the notion of Junction, the analysis succeeds in explaining the bimorphemicity signature of initial conjunctions by deriving the morpheme count as a fusional exponent of two functional heads. The analysis stands on the assumption that narrow- and postsyntactic processes operate in derivationally delimited chunks, qua phases.
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Bishop, Alan, and Richard LeSar. Competing Interactions and Microstructures : Statics and Dynamics: Proceedings of the CMS Workshop, Los Alamos, New Mexico, May 5-8, 1987. Brand: Springer, 2011.

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Book chapters on the topic "Competing phases"

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Birgeneau, R. J., P. M. Horn, and D. E. Moncton. "Phases and Phase Transitions in Two Dimensional Systems with Competing Interactions." In The Structure of Surfaces, 404–12. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-82493-7_64.

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Fisher, Daniel S. "Low Temperature Phases, Ordering and Dynamics in Random Media." In Phase Transitions and Relaxation in Systems with Competing Energy Scales, 1–25. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1908-5_1.

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Cooper, S. L., H. Rho, and C. S. Snow. "Other Compounds with Large MR and/or Competing FM AF Phases." In Springer Series in Solid-State Sciences, 377–94. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-05244-0_20.

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Dowell, F. "New Theory for Competing Interactions and Microstructures in Partially Ordered (Liquid-Crystalline) Phases." In Springer Proceedings in Physics, 177–82. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73498-4_17.

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Motome, Yukitoshi, Nobuo Furukawa, and Naoto Nagaosa. "An Origin of CMR: Competing Phases and Disorder-Induced Insulator-to-Metal Transition in Manganites." In Local-Moment Ferromagnets, 71–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11417255_5.

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Sebastian, Jubin E., and Axel Sikora. "Systematic Test Environment for Narrowband IoT Technologies." In Technologien für die intelligente Automation, 233–44. Berlin, Heidelberg: Springer Berlin Heidelberg, 2022. http://dx.doi.org/10.1007/978-3-662-64283-2_17.

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AbstractSpatially Distributed Wireless Networks (SDWN) are one of the basic technologies for the Internet of Things (IoT) and (Industrial) Internet of Things (IIoT) applications. These SDWN for many of these applications has strict requirements such as low cost, simple installation and operations, and high potential flexibility and mobility. Among the different Narrowband Wireless Wide Area Networking (NBWWAN) technologies, which are introduced to address these categories of wireless networking requirements, Narrowband Internet of Things (NB-IoT) is getting more traction due to attractive system parameters, energy-saving mode of operation with low data rates and bandwidth, and its applicability in 5G use cases. Since several technologies are available and because the underlying use cases come with various requirements, it is essential to perform a systematic comparative analysis of competing technologies to choose the right technology. It is also important to perform testing during different phases of the system development life cycle. This paper describes the systematic test environment for automated testing of radio communication and systematic measurements of the performance of NB-IoT.
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Hu, B., J. Shi, and B. Lin. "Universality in Commensurate-Incommensurate Phase Transitions." In Phase Transitions and Relaxation in Systems with Competing Energy Scales, 335–38. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1908-5_15.

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Coppersmith, S. N. "Charge Density Waves, Phase Slips, and Instabilities." In Phase Transitions and Relaxation in Systems with Competing Energy Scales, 317–34. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1908-5_14.

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Yunoki, S., A. Moreo, and E. Dagotto. "Competing Effects in Perovskite Manganites: Ferromagnetism vs. Phase Separation." In Springer Proceedings in Physics, 53–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-642-59689-6_5.

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Lindqvist, Bo Henry, and Susanne Hodneland Kjølen. "Phase-Type Models and Their Extension to Competing Risks." In Springer Series in Reliability Engineering, 107–20. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-63423-4_6.

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Conference papers on the topic "Competing phases"

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Ganikhodjaev, Nasir, Siti Fatimah Zakaria, and Wan Nur Fairuz Alwani Wan Rozali. "On exactly solvable phases of models with competing interactions." In PROCEEDINGS OF THE 14TH ASIA-PACIFIC PHYSICS CONFERENCE. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0039353.

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Cepeda-Gomez, Rudy, Nejat Olgac, and Daniel A. Sierra. "Application of Sliding Mode Control to Swarms Under Conflict." In ASME 2010 Dynamic Systems and Control Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/dscc2010-4034.

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A robustizing Sliding Mode Control (SMC) strategy is implemented on two competing multi-agent swarms, called pursuers and evaders. Newtonian dynamic models are considered, which include drag forces as well as the inter-agent attraction/repulsion forces. The proposed control achieves the stability and the capture of the evaders by the pursuers despite the uncertainties in the evader behavior. The group pursuit is conceived in two phases: the approach phase during which the two swarms act like two individuals; and the assigned pursuit phase when each pursuer is assigned to an evader. Furthermore, we take into account a turning action for the evaders, which adds to their agility. This property is considered as a part of the uncertainty in the dynamics. The control parameters are separately studied to assess their influences on the pursuit.
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Allen, Marshall, Raymundo Arroyave, and Richard Malak. "Deep Ensembles for Modeling Uncertain Phase Constraints In Compositionally Graded Alloy Design." In ASME 2022 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/detc2022-89091.

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Abstract Compositionally graded alloys (CGAs) are a specific class of multi-material functionally graded materials (FGMs) that use spatial variations in alloy composition to meet competing performance requirements in at different locations regions of a single part. Directed energy deposition (DED) metal additive technology has enabled the manufacturing of CGAs, but design these alloys remains a challenge. One important challenge is to avoid alloy compositions that result in the formation of deleterious phases during manufacturing. While designers can use CALculation of PHAse Diagram (CALPHAD) models predict the presence of deleterious phases, these calculations tend to be too costly to incorporate directly in a computational design framework. In this work, we apply deep ensembles, or ensembles of deep artificial neural networks (ANNs), to learn a surrogate model of deleterious phase boundaries based on CALPHAD simulations. The learned model is used as a constraint by a path planning algorithm to identify gradient pathway through metal composition space that can be successfully manufactured. We demonstrate the deep ensemble approach in the Fe-Ni-Cr-Ti quaternary system and benchmark it against individual ANNs and a K-nearest neighbors (KNN) approach reported previously. Additionally, we investigate the use of the predicted class probability threshold as a means for understanding surrogate model uncertainty and reasoning about the design space. Lastly, we illustrate how varying the thresholds on constraint probability results in a trade off between manufacturing risk and identifying solutions through narrow passageways.
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Ghenai, C., and I. Janajreh. "Numerical Modeling of Coal/Biomass Co-Firing." In ASME 2008 Fluids Engineering Division Summer Meeting collocated with the Heat Transfer, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/fedsm2008-55204.

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Biomass co-firing within existing infrastructure of pulverized coal utility boilers is viewed as a practical near-term means of encouraging renewable energy while minimizing capital requirements, maintaining the high efficiency of pulverized coal boilers and reducing the emissions. Numerical investigation of coal/biomass co-firing is presented in this study. Co-combustion of biomass and coal is a complex problem that involves gas and particle phases, along with the effect of the turbulence on the chemical reactions. The transport equations for the continuous phase (gas) and discrete phase (spherical particles) are solved respectively in the Eulerian and Lagrangian frame of reference. The mathematical models used for co-pulverized coal/biomass particles combustion consist of models for turbulent flow (RNG k-ε model); gas phase combustion (two mixture fractions/PDF model: one mixture fraction is used for the fuel (char) and the second for the volatiles); particles dispersion by turbulent flow (stochastic tracking model); coal/biomass particles devolatilization (two competing rates Kobayashi model); heterogeneous char reaction (kinetics/diffusion limited rate model); and radiation (P-1 radiation model). The coal used is a Canadian high sulfur bituminous coal. The coal was blended with 5 to 20% wheat straw (thermal basis) for co-firing. The effect of the percentage of biomass blended with coal on the velocity field, temperature distribution, particles trajectories and pollutant emissions at the exit of the furnace is presented in this paper. One important result is the reduction of NO and CO2 emissions when using co-combustion. This reduction depends on the proportion of biomass (wheat straw) blended with coal.
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Capitani, Renzo, Tommaso Iacomelli, Daniele G. Rosti, and Pierluigi Tozzi. "Design for X Approach to Optimise a Formula SAE Car." In ASME 7th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2004. http://dx.doi.org/10.1115/esda2004-58491.

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The Universita` degli Studi di Firenze joined the Formula Student competition (organised by SAE and IMechE) in 2002 competing in Class 3, the following year the first car was ready to compete in Class 1. In order to build this car, an integrated approach was adopted to obtain the best solution in every aspect. The purpose of the design was to optimise the car handling, fulfilling the Formula SAE rules. All the design phases were based on the Design for X approach, with the aim to optimise all the aspects of the Formula SAE project, like performance, design and cost. A Design for Manufacturing approach was added to the FEA to design all the components, like uprights and wheel spindles, in order to simplify the CNC machining. The suspensions layout was defined using a recursive method based on the Multibody Simulation and the components design. Some experimentations were conducted to verify the simulations. The experimental data were used to start the redesign, to improve the performance of the new car that will compete in the 2004 events.
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Opiyo, Eliab Z. "Supporting the Ideation Process and Representation of the Design of a Product as Part of a Real Life Use Process." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-85938.

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Numerous virtual and physical prototyping techniques have been developed in the past decades. These techniques are typically used for prototyping of products in the embodiment and detail design phases of the product development process, without taking into consideration the processes associated with products. These processes include sub-processes related to the operation of the products, interactivity of the product developer or the user with the product, and thinking and manipulative control of humans. The main challenge addressed in this paper is how to conceptualize and communicate ideas about products together with all accompanying processes. We have developed a new concept of abstract prototyping (AP), with the intent to enable the ideation and representation of products or systems as real life processes. In this paper, we present application case studies to demonstrate the applicability of this new concept of abstract prototyping. The preliminary results show that this is indeed the case and prove that process-focused abstract prototyping can be a useful new enabler for design communication. One of the major benefits of the proposed method over the competing approaches such as the application of VR solutions is that it provides a low-cost, but yet effective solution for the challenge of taking into consideration how the product will be used in user’s context or scenario at the very early design stage.
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Frederic Antoine Champain, Louis, Syed Zahoor Ullah, and Alexey Ruzhnikov. "Successful CWD Campaign in Turnkey Project with Potential Utilisation for Well Construction Optimisation." In International Petroleum Technology Conference. IPTC, 2021. http://dx.doi.org/10.2523/iptc-21355-ms.

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Abstract Drilling and completion of the surface and intermediate sections in some fields is extremely challenging due to wellbore instability, especially accomplished with complete losses. Such circumstances lead to several time-consuming stuck pipe events, when existing standard ways of drilling did not lead to a permanent resolution of the problems. After exhausting the available conventional techniques without sustainable success, unorthodox solutions were required to justify the well delivery time and cost. Here comes the Casing While Drilling (CwD), being the most time and cost-effective solution to wellbore instability. CwD is introduced at full throttle aiming at the well cost reduction and well quality improvement. The implementation plan was divided in three phases. The first phase was a remedial solution to surface and intermediate sections drilling and casing off to prevent stuck pipe events and provide smooth well delivery performances. After successful implementation of CwD first phase, CwD was taken to the next level by shifting it from a mitigation to an optimization measure. Each step of CwD shoe-to-shoe operations was analysed to improve its performances: drill-out (D/O) of 18⅝-in shoe track with CwD, optimum drilling parameters per formation and CwD bit design. Implemented in 19 wells, CwD shoe-to-shoe performances have been brought up or even above standard rotary bottom hole assembly (BHA) benchmark. Planning for third phase is undergoing whereby CwD is aiming to optimize a well construction to reduce well delivery time, by combining surface and intermediate sections thus eliminating one casing string. Numerous challenges are being worked on including open hole (OH) isolation packer which conform to and seal with the borehole uneven surface. Special "for purpose built" expandable steel packer and stage tool have been manufactured and qualified for the specific application. A candidate well has been chosen and agreed for first trial. The key areas of improvement include, drilling and casing off the surface and intermediate sections while competing with standard rotary BHA performances and slimming down the well profile towards tremendous time and costs savings. This paper encompasses details of constructions of various wells with sufficient contingencies to combat any expected hole problems without compromising the well quality while keeping the well within budget and planned time. It also provides an analysis of the well trials that were executed during the implementation of first and second phases of CwD implementation and the captured lessons learnt which are being carried forward to the next phase. This paper provides the technique on how CwD can be used to help with three aspects of drilling, successfully mitigating holes problems by reducing OH exposure time and to eliminate drill string tripping and modifying conventional casing design to reduce well time and cost by eliminating one casing string.
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Lindqvist, Bo H. "Phase-Type Models for Competing Risks." In 2016 Second International Symposium on Stochastic Models in Reliability Engineering, Life Science and Operations Management (SMRLO). IEEE, 2016. http://dx.doi.org/10.1109/smrlo.2016.17.

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Baykal, Sevket, Peter Rufli, Raffaele Bolliger, Francesco Fusaro, and Hubert Kujawski. "Identification of Thermodynamic Combined Cycle Design Parameters Using Multi Objective and Multi Variable Optimisation Methodologies to Achieve 65% Combined Cycle Power Plant Net Efficient." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-57785.

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Clean and cost-effective power generation is the key factor to cope with imposed challenges of competing technologies in the energy market. Improvements in thermal power generation efficiency will significantly contribute to the goals of reducing emissions and cost of electricity, thereby increasing their competitiveness. However, targeted high efficiency levels (e.g., 65% combined cycle power plant net efficiency) cannot be achieved with today’s technology. One of the main difficulties is the appropriate distribution of technology challenges among various combined cycle equipment. Optimization of the early phases of innovation in the product development for future technologies is key for their sustainability and increased likelihood of economic success. For this purpose a combined cycle power plant initial design methodology was developed with the help of the Original Equipment Manufacturers, OEMs. As the main advantage, this approach is able to combine current OEM’s state of the art in product technology with an educated guess for near future technology development. The application of the developed methodology is done on the exploration of the design parameters of new technologies to achieve 65% combined cycle power plant net efficiency. The results highlight the interdependence of the topping and bottoming cycle thermodynamic performance parameters and a large number of potential designs achieving 65% efficiency was identified. The technical realization of found thermodynamic performance parameters would be evaluated later in terms of their technological challenge and economic viability. In this respect the integrative combined cycle power plant optimization methodology is the key to analyze existing limitations and explore new technologies in order to constantly increase the value for power plant customers.
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Albers, Albert, Alexander Schwarz, and Matthias Behrendt. "Integrated Approach for System Oriented Analyses and Optimization of Complex Hybrid Powertrain Applications by Means of Vehicle-in-the-Loop Roller Test Bench." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-62943.

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Central activity in the development process of automotive drive systems is the validation to meet the customers’ demands. Thereby the transmission topology as well as the operation and drive strategy and their independencies have a great influence on the comfort and the energy efficiency of the vehicle. Especially in modern drivelines, like in hybrid electric vehicles there are great independencies between those factors, which have to be considered and integrated in order to achieve a global optimum. In this contribution an integrated validation and development environment with the focus on hybrid transmission applications is presented. This approach is capable to integrate and consider aspects of complex powertrain systems, as hybrid powertrains, and to cover the competing aspects of NVH, drivability as well as energy efficiency. The approach is an integral combination of new or already published as well as established individual methods that have been extended with challenging aspects of hybrid powertrain development. One integrated method is the time-efficient arrangement of measuring points in order to shorten the global needed conditioning phases. For gearshift evaluation of a dual clutch transmission, this reduces operation time on the roller test bench about 80% compared to an experienced test driver [1]. The integrated approach uses system identification to create time and cost efficient test runs for the test based optimization [2]. Thereby advanced methods for rating the drivability and for automatic identification of NVH-Phenomena [3] are used to optimize multi criteria objective functions. The measurement is done in the IPEK-X-in-the-Loop Framework (XiL) [4], which enables a transmission assessment on the complete vehicle level.
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Reports on the topic "Competing phases"

1

Douglas J. Scalapino and Robert L. Sugar. Competing Phases and Basic Mechanisms in Strongly-interacting Electron Systems. Office of Scientific and Technical Information (OSTI), January 2006. http://dx.doi.org/10.2172/862360.

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Pan, Wei, A. Serafin, J. S. Xia, Y. Liang, N. S. Sullivan, K. W. Baldwin, K. W. West, L. N. Pfeiffer, and D. C. Tsui. Competing Quantum Hall Phases in the Second Landau Level in Low Density Limit. Office of Scientific and Technical Information (OSTI), January 2015. http://dx.doi.org/10.2172/1177382.

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Barg, Rivka, Erich Grotewold, and Yechiam Salts. Regulation of Tomato Fruit Development by Interacting MYB Proteins. United States Department of Agriculture, January 2012. http://dx.doi.org/10.32747/2012.7592647.bard.

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Background to the topic: Early tomato fruit development is executed via extensive cell divisions followed by cell expansion concomitantly with endoreduplication. The signals involved in activating the different modes of growth during fruit development are still inadequately understood. Addressing this developmental process, we identified SlFSM1 as a gene expressed specifically during the cell-division dependent stages of fruit development. SlFSM1 is the founder of a class of small plant specific proteins containing a divergent SANT/MYB domain (Barg et al 2005). Before initiating this project, we found that low ectopic over-expression (OEX) of SlFSM1 leads to a significant decrease in the final size of the cells in mature leaves and fruits, and the outer pericarp is substantially narrower, suggesting a role in determining cell size and shape. We also found the interacting partners of the Arabidopsis homologs of FSM1 (two, belonging to the same family), and cloned their tomato single homolog, which we named SlFSB1 (Fruit SANT/MYB–Binding1). SlFSB1 is a novel plant specific single MYB-like protein, which function was unknown. The present project aimed at elucidating the function and mode of action of these two single MYB proteins in regulating tomato fruit development. The specific objectives were: 1. Functional analysis of SlFSM1 and its interacting protein SlFSB1 in relation to fruit development. 2. Identification of the SlFSM1 and/or SlFSB1 cellular targets. The plan of work included: 1) Detailed phenotypic, histological and cellular analyses of plants ectopically expressing FSM1, and plants either ectopically over-expressing or silenced for FSB1. 2) Extensive SELEX analysis, which did not reveal any specific DNA target of SlFSM1 binding, hence the originally offered ChIP analysis was omitted. 3) Genome-wide transcriptional impact of gain- and loss- of SlFSM1 and SlFSB1 function by Affymetrix microarray analyses. This part is still in progress and therefore results are not reported, 4) Search for additional candidate partners of SlFSB1 revealed SlMYBI to be an alternative partner of FSB1, and 5) Study of the physical basis of the interaction between SlFSM1 and SlFSB1 and between FSB1 and MYBI. Major conclusions, solutions, achievements: We established that FSM1 negatively affects cell expansion, particularly of those cells with the highest potential to expand, such as the ones residing inner to the vascular bundles in the fruit pericarp. On the other hand, FSB1 which is expressed throughout fruit development acts as a positive regulator of cell expansion. It was also established that besides interacting with FSM1, FSB1 interacts also with the transcription factor MYBI, and that the formation of the FSB1-MYBI complex is competed by FSM1, which recognizes in FSB1 the same region as MYBI does. Based on these findings a model was developed explaining the role of this novel network of the three different MYB containing proteins FSM1/FSB1/MYBI in the control of tomato cell expansion, particularly during fruit development. In short, during early stages of fruit development (Phase II), the formation of the FSM1-FSB1 complex serves to restrict the expansion of the cells with the greatest expansion potential, those non-dividing cells residing in the inner mesocarp layers of the pericarp. Alternatively, during growth phase III, after transcription of FSM1 sharply declines, FSB1, possibly through complexing with the transcription factor MYBI serves as a positive regulator of the differential cell expansion which drives fruit enlargement during this phase. Additionally, a novel mechanism was revealed by which competing MYB-MYB interactions could participate in the control of gene expression. Implications, both scientific and agricultural: The demonstrated role of the FSM1/FSB1/MYBI complex in controlling differential cell growth in the developing tomato fruit highlights potential exploitations of these genes for improving fruit quality characteristics. Modulation of expression of these genes or their paralogs in other organs could serve to modify leaf and canopy architecture in various crops.
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Dolja, Valerian V., Amit Gal-On, and Victor Gaba. Suppression of Potyvirus Infection by a Closterovirus Protein. United States Department of Agriculture, March 2002. http://dx.doi.org/10.32747/2002.7580682.bard.

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The plant virus family Polyviridae is the largest and most destructive of all plant viruses. Despite the continuous effort to develop resistant plant varieties, there is a desperate need for novel approaches conferring wide-range potyvirus resistance. Based on experiments with the tobacco etch potyvirus (TEV)-derived gene expression vector, we suggested approach for screening of the candidate resistance genes. This approach relies on insertion of the genes into a virus vector and evaluation of the phenotypes of the resulting recombinant viruses. The genes which suppress infection by the recombinant virus are selected as candidates for engineering transgenic resistance. Our analysis of the TEV variants expressing proteins of the beet yellows closterovirus (BYV) revealed that one of those, the leader proteinase (L-Pro), strongly and specifically interfered with the hybrid TEV infection. Since closterovirus L-Pro is evolutionary related to potyviral helper component-proteinase (HC-Pro), we suggested that the L-Pro interfered with HC-Pro function via a trans-dominant inhibitory effect. Based on these findings, we proposed to test two major hypotheses. First, we suggested that L-Pro-mediated suppression of potyvirus infection is a general phenomenon effective against a range of potyviruses. The second hypothesis stated that the suppression effect can be reproduced in transgenic plants expressing L-Pro, and can be utilized for generation of resistance to potyviruses. In accord with these hypotheses, we developed two original objectives of our proposal: A) to determine the range of the closterovirus-derived suppression of potyviral infection, and B) to try and utilize the L-Pro-mediated suppression for the development of transgenic resistance to potyviruses. In the first phase of the project, we have developed all major tools and technologies required for successful completion of the proposed research. These included TEV and ZYMV vectors engineered to express several closteroviral L-Pro variants, and generation of the large collection of transgenic plants. To our satisfaction, characterization of the infection phenotypes exhibited by chimeric TEV and ZYMV variants confirmed our first hypothesis. For instance, similar to TEV-L- Pro(BYV) chimera, ZYMV-L-Pro(LIYV) chimera was debilitated in its systemic spread. In contrast, ZYMV-GUS chimera (positive control) was competent in establishing vigorous systemic infection. These and other results with chimeric viruses indicated that several closteroviral proteinases inhibit long-distance movement of the potyviruses upon co-expression in infected plants. In order to complete the second objective, we have generated ~90 tobacco lines transformed with closteroviral L-Pro variants, as well as ~100 lines transformed with BYV Hsp70-homolog (Hsp70h; a negative control). The presence and expression of the trans gene in each line was initially confirmed using RT-PCR and RNA preparations isolated from plants. However, since detection of the trans gene-specific RNA can not guarantee production of the corresponding protein, we have also generated L-Pro- and Hsp70h-specific antisera using corresponding synthetic peptides. These antisera allowed us to confirm that the transgenic plant lines produced detectable, although highly variable levels of the closterovirus antigens. In a final phase of the project, we tested susceptibility of the transgenic lines to TEV infection. To this end, we determined that the minimal dilution of the TEV inoculum that is still capable of infecting 100% of nontransgenic plants was 1:20, and used 10 plants per line (in total, ~2,000 plants). Unfortunately, none of the lines exhibited statistically significant reduction in susceptibility. Although discouraging, this outcome prompted us to expand our experimental plan and conduct additional experiments. Our aim was to test if closteroviral proteinases are capable of functioning in trans. We have developed agroinfection protocol for BYV, and tested if co- expression of the L-Pro is capable of rescuing corresponding null-mutant. The clear-cut, negative results of these experiments demonstrated that L-Pro acts only in cis, thus explaining the lack of resistance in our transgenic plants. We have also characterized a collection of the L-Pro alanine- scanning mutants and found direct genetic evidence of the requirement for L-Pro in virus systemic spread. To conclude, our research supported by BARD confirmed one but not another of our original hypotheses. Moreover, it provided an important insight into functional specialization of the viral proteinases and generated set of tools and data with which we will be able to address the molecular mechanisms by which these proteins provide a variety of critical functions during virus life cycle.
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