Relevant bibliographies by topics / Structure transition

Contents

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

Academic literature on the topic 'Structure transition'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 February 2022

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Journal articles on the topic "Structure transition"

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Fraisse, Alain, Béatrice Bonello, Alexis Theron, Jérome Bouet, Sébastien Renard, and Gilbert Habib. "Structure de transition." La Presse Médicale 38 (December 2009): 1S34–1S36. http://dx.doi.org/10.1016/s0755-4982(09)73423-2.

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Abdel Rahim, Gladys Patricia, Jairo Arbey Rodríguez, and M. Guadalupe Moreno-Armenta. "First Principles Study of the Structural, Electronic, and Magnetic Properties of ZrC." Solid State Phenomena 257 (October 2016): 211–15. http://dx.doi.org/10.4028/www.scientific.net/ssp.257.211.

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Zirconium carbide (ZrC) is technologically important in devices that must function at high temperatures, and its ground state is a NaCl like structure. Changes of the structure and electronic properties of ZrC under high pressure were studied within the framework of density functional theory (DFT). This research was performed for several structures, such as NaCl type (B1), CsCl type (B2), ZnS type (B3), wurtzite type (B4) and NiAs type (B8) structures for ZrC, looking for possible phase transitions induced by high pressure, and four phase transitions were found: the first is the well-known phase transition from the B1 structure to the B2 structure, which occurs at around ~291 GPa. Additionally, in the present paper we found other phase transitions: from the B8 structure to the B2 structure, from the B4 structure to the B2 structure, and lastly from the B3 structure to the B2 structure. Electronic bands are exhibited at zero pressure and temperature (with spin-orbit coupling) for the five structures. For the transition from the B1 structure to the B2 structure, bands are exhibited for two pressures, one before and the other after the transition occurs. The band structure shows that all the structures studied are metallic and nonmagnetic, with the exception the B3 structure, which exhibits a semi-metallic and nonmagnetic behaviour.
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Fu, Zhi Jian, Li Jun Jia, and Wei Long Quan. "Phase Transition and ThermodynamicProperties of OsN2 under High Pressure." Applied Mechanics and Materials 401-403 (September 2013): 660–62. http://dx.doi.org/10.4028/www.scientific.net/amm.401-403.660.

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The lattice parameters, phase transition, and thermodynamic properties of OsN2in pyrite and fluorite structure are investigated by first-principles calculations. The pressure and temperature induced phase transitions of OsN2from fluorite structure to pyrite structure have been obtained. It is found that the transition pressure of OsN2at zero temperature is 158.2 GPa, and there exists no transition temperature. In addition, the thermal expansion, the Debye temperature, and the Grüneisen parameter in diverse pressures and temperatures about these two structures have also been obtained. Key words: transition phase; thermodynamic properties; OsN2PACS numbers: 71.15.Mb, 64.70.Kb
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Hubbard, Gill. "The Usefulness of Indepth Life History Interviews for Exploring the Role of Social Structure and Human Agency in Youth Transitions." Sociological Research Online 4, no. 4 (February 2000): 102–13. http://dx.doi.org/10.5153/sro.390.

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This paper discusses the usefulness of indepth life history interviews in illustrating the role of social structure and human agency in youth transitions. Drawing on sociological theory and youth transition research, the paper highlights how the role of structure and agency has been perceived by youth researchers. Whilst this literature acknowledges the interplay between structure and agency in transitional processes, the appropriateness of particular research methods for explicating structure and agency needs to be further elucidated. Using data from a study of youth transitions in rural areas of Scotland, a range of transitional experiences from two indepth life history interviews is presented here. This exploratory exercise suggests that life history interviews enable researchers to explore how far social structures provide opportunities and constraints for human agents at the same time as showing how individuals, with their own beliefs and desires, take actions despite the social structures that underlie the immediacy of their experiences.
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Zhao, Yongling, Chengwang Lei, and John C. Patterson. "The K-type and H-type transitions of natural convection boundary layers." Journal of Fluid Mechanics 824 (July 5, 2017): 352–87. http://dx.doi.org/10.1017/jfm.2017.354.

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The K-type and H-type transitions of a natural convection boundary layer of a fluid of Prandtl number 7 adjacent to an isothermally heated vertical surface are investigated by means of three-dimensional direct numerical simulation (DNS). These two types of transitions refer to different flow features at the transitional stage from laminar to turbulence caused by two different types of perturbations. To excite the K-type transition, superimposed Tollmien–Schlichting (TS) and oblique waves of the same frequency are introduced into the boundary layer. It is found that a three-layer longitudinal vortex structure is present in the boundary layer undergoing the K-type transition. The typical aligned $\wedge$-shaped vortices characterizing the K-type transition are observed for the first time in pure natural convection boundary layers. For exciting the H-type transition, superimposed TS and oblique waves of different frequencies, with the frequency of the oblique waves being half of the frequency of the TS waves, are introduced into the boundary layer. Unlike the three-layer longitudinal vortex structure observed in the K-type transition, a double-layer longitudinal vortex structure is observed in the boundary layer undergoing the H-type transition. The successively staggered $\wedge$-shaped vortices characterizing the H-type transition are also observed in the downstream boundary layer. The staggered pattern of $\wedge$-shaped vortices is considered to be caused by temporal modulation of the TS and oblique waves. Interestingly the flow structures of both the K-type and H-type transitions observed in the natural convection boundary layer are qualitatively similar to those observed in Blasius boundary layers. However, an analysis of turbulence energy production suggests that the turbulence energy production by buoyancy rather than Reynolds stresses dominates the K-type and H-type transitions. In contrast, the turbulence energy production by Reynolds stresses is the only factor contributing to the transition in Blasius boundary layers.
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Reynolds, Christopher A., and Colin Thomson. "Standard transition-structure geometries." Journal of the Chemical Society, Faraday Transactions 2 83, no. 6 (1987): 961. http://dx.doi.org/10.1039/f29878300961.

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Blinc, R., B. Zalar, and Alan Gregorovic. "NMR and the local structure of relaxors." Science of Sintering 34, no. 1 (2002): 3–11. http://dx.doi.org/10.2298/sos0201003b.

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The relaxor transition in cubic perovskite relaxors (PMN, PSN and PST) and tungsten bronze relaxor (SBN) has been studied by NMR. The observed spectra are composed of a narrow -1/2 ? 1/2 central transition superimposed on a broad background due to satellite transitions. The chemical heterogeneity, responsible for relaxor properties, is reflected here in the structure of the central transition part. The latter is composed of two components, one due to ordered and the other due to disordered regions. Despite of the fact that the macroscopic symmetry does not change when relaxor transition occurs, a non-zero quadruple coupling constant determined from NMR clearly demonstrates the broken local symmetry.
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Van Gent, Marcel R. A., Guido Wolters, and Ivo M. Van der Werf. "ROCK SLOPES WITH OPEN FILTERS UNDER WAVE LOADING: EFFECTS OF STORM DURATION AND WATER LEVEL VARIATIONS." Coastal Engineering Proceedings, no. 35 (June 23, 2017): 6. http://dx.doi.org/10.9753/icce.v35.structures.6.

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Rubble mound breakwaters and revetments typically contain granular filters in one or more layers. The transition from the armour layer to the filter layer, and transitions between other layers within the structure, are normally geometrically tight to prevent material washout. This requires a limited ratio of the material size of the upper layer and neighbouring layer. An alternative is a geometrically open filter where in principle underlayer material can be transported into the upper layer, but if the hydraulic load at this transition between two layers remains low, the transition can be designed such that no or limited transport occurs, see for instance Van Gent and Wolters (2015), Van Gent et al (2015) and Jacobsen et al, (2017). This allows for larger ratios of material sizes, which can reduce the number of filter layers, and relax the material requirements with respect to the width of gradings. This can lead to considerable cost savings. In Van Gent and Wolters (2015) physical model tests for the transition between a layer of rock and an underlayer that consists of sand have been performed and design guidelines have been derived. Here, additional physical model tests are presented to study the influence of the storm duration and water level variations on the response of sand underneath a layer of rock.
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WATANABE, Shun, Yutaka ABE, Akiko KANEKO, Fumitoshi WATANABE, and Kenichi TEZUKA. "ICONE19-43420 INVESTIGATION OF FLOW STRUCTURE TRANSITION IN LOWER PLENUM OF ABWR." Proceedings of the International Conference on Nuclear Engineering (ICONE) 2011.19 (2011): _ICONE1943. http://dx.doi.org/10.1299/jsmeicone.2011.19._icone1943_173.

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Mpofu, Elias, and Keith B. Wilson. "Opportunity Structure and Transition Practices with Students with Disabilities: The Role of Family, Culture, and Community." Journal of Applied Rehabilitation Counseling 35, no. 2 (June 1, 2004): 9–16. http://dx.doi.org/10.1891/0047-2220.35.2.9.

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The family, culture of origin and community comprise opportunity structures for the transition of students with disabilities from school to adulthood. A distinction is made between perceived and actual opportunity structure. Perceived opportunity structure is the subjective meaning that students ascribe to family, culture of origin, and community as instruments of transition. Actual opportunity structure is the objective characteristics of family, culture of origin and community that constitute the context of transition. When the students' characteristics are considered, transitional services can at times, fall short of desired outcomes. The success of students with disabilities who are transitioning from school to adult status is greater when rehabilitation services provide a seamless connection between family, culture and community as resources for transition.
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Dissertations / Theses on the topic "Structure transition"

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Redfern, C. M. "Electronic structure of transition metal complexes." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235094.

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Stillman, Kevin L. "Electronic structure studies of transition metal phosphides." Laramie, Wyo. : University of Wyoming, 2007. http://proquest.umi.com/pqdweb?did=1445042561&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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Andreescu, Florentina Carmen. "Transition, Nation, State, and Structure of Fantasy." Scholarly Repository, 2010. http://scholarlyrepository.miami.edu/oa_dissertations/413.

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This research aims to make evident the importance of films serving as a relevant arena for political struggles within a society, struggles that concern highly important concepts such as the nation and the state. This goal is accomplished by building upon the theory of cinematic nationhood and using the method of relational constructivism combined with insight from Lacanian psychoanalytic theory. The research regards films as forms of communication as well as forms of fantasy. The case this research focuses on is Romania. The case was selected because for a certain period of time the myths of nation and state had been strongly embedded-or nested-- within the social contexts-or commonplaces--specific to Marxism, namely work, equality, and the bourgeois enemy, followed by a swift and radical social discourse change that triggered changes within the topography of commonplaces. The films analyzed represent these changes in order to understand the specific ways in which the myth of nation and state are reflected within films produced during radical economic, social, and political transformations. This research reveals that, despite the social, economic, and political upheavals from the pre- to post-transition eras, the underlying national structure of fantasy remained remarkably unchanged, while the nation and the state changed their social relevance with changes in their position occupied within the structure of fantasy.
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Walters, Malcolm. "Efficient electronic structure calculations for transition metals." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270721.

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Harding, Daniel James. "Structure and reactivity of transition metal clusters." Thesis, University of Warwick, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.527439.

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Beer, N. R. "The electronic structure of transition metal alloys." Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/37634.

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Mann, Peter David Alexander. "Electronic structure of layered transition metal oxides." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612888.

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Hermes, A. C. "Structure and reactivity of transition metal clusters." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:91e9449f-8c1e-4955-8c08-d9f24e5bbe6a.

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A range of computational and experimental techniques have been applied to the study of four metal cluster systems. Decorated rhodium clusters Rh n O m (N 2 O) + ( n = 4 − 8, m = 0 − 2) have been investigated both experimentally by IR-MPD and computationally using DFT. The effect of cluster size as well as oxygen coverage on the spectroscopy of the N 2 O bend are analyzed. The infrared-induced decomposition of N 2 O on Rh n O + m is observed on all cluster sizes, with marked differences as a function of size and oxygen coverage, particularly in the case of Rh 5 (N 2 O) + . The oxidation of CO was studied on the surface of small platinum cluster cations Pt n O + m ( n = 3 − 7, m = 2 , 4) by IR-MPD at 400 – 2100cm −1 . Spectroscopically, oxygen is found to be bound both dissociatively and molecularly on the cluster surface, while the CO band is found to red shift in cluster size, and blue shift with oxygen coverage. Oxidation of CO proceeds on all cluster sizes, with a constant branching ratio of 40% : 60% . DFT calculations identified key stationary points and barriers on the Pt 4 O 2 CO + reaction pathway. The one-colour Ta 2 photodissociation is studied by photoionization and VMI in the range 23500 – 24000cm −1 , finding clear evidence of a fragmentation process producing Ta , which is interpreted as fragmentation of cationic Ta + 2 at the two photon level. A majority of the observed channels produce either atomic ( Ta( 4 F 3/2 ) ) or cationic ( Ta + ( 5 F 1 ) ) ground state. An improved value for the dissociation energy D 0 ( Ta + 2 ) is obtained, in agreement with computational predictions. The anisotropies observed show weak evidence of a perpendicular transition being involved in the photodissociation process. Finally, the photodissociation dynamics of Cu 2 are studied by spectroscopy in the range 36000 – 38200cm −1 as well as VMI. Clear evidence for resonant photolysis of Cu 2 is obtained, as a result of both direct dissociation of the Cu + 2 2 Π ion state as well as dissociation of doubly excited Cu 2 states, which leads to a determination of dimer dissociation energies. Finally, the production of Cu + 2 is interpreted as evidence of photolysis of Cu 3 , from which a Cu 3 dissociation energy is derived.
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Krämer, Tobias. "Electronic structure of open-shell transition metal complexes." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:1f4a1330-281d-4696-b3e6-62b76fb41d65.

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This thesis presents electronic structure calculations on problems related to the bonding in inorganic coordination compounds and clusters. A wide range of molecules with the ability to exist in different structural forms or electronic states has been selected and density functional theory is systematically applied in order to gain detailed insight into their characteristics and reactivity at the electronic level. First, we address the question of redox non-innocent behaviour of bipyridine in a series of 1st row transition metal complexes. Complexes of the type [M(2,2'-bipyridine)(mes)₂]0 (M = Cr, Mn, Fe, Co, Ni; mes = 2,4,6-Me₃C6H₂) and their one-electron reduced forms have been explored. The results clearly show that the anions are best described as complexes of the monoanionic bipyridine radical (Sbpy = 1/2), giving a rationale for the observed structural changes within the ligand. Likewise, we have identified dianionic bipyridine in both the complexes [Zn2(4,4'-bpy)(mes)₄]²− and [Fe(2,2'-bpy)₂]²−. In no case have we found evidence for significant metal-to-ligand backbonding. The subject of redox-noninnocence is further revisited in a comparative study of the two complexes [M(o-Clpap)₃] (M = Cr, Mo; o-Clpap = 2-[(2-chloro-phenyl)azo]-pyridine), and their associated electron transfer series. The results indicate that all electron transfer processes are primarily ligand-based, although in the case of the Mo analogue these are coupled to substantial electron density changes at the metal. The ability of pap to form radical anions finds a contrasting case in the di- nuclear Rh complex [Rh₂(μ-p-Clpap)₂ (cod)Cl₂], where the two ligand bridges act as acceptors of strong dπ∗ backbonding from a formally Rh–I centre. We then direct our attention to the endohedral Zintl clusters [Fe@Ge10]³− and [Mn@Pb12]³−, which reveal peculiar topologies. We have probed the electronic factors that influence their geometric preferences, and propose a model based on the shift of electron density from the endo- hedral metal to the cage to account for the observed geometries. Subsequently, we reassess the electronic structure of the xenophilic clusters Mn₂(thf)₄(Fe(CO)₄)₂ and [Mn(Mn(thf)₂)₃(Mn(CO)₄)₃]–. We conclude that these are best viewed as exchange coupled MnII centres bridged by closed- shell carbonylate fragments. In the closing chapter the reduction of NO₂– to NO by the complex [Cu(tct)(NO₂)]+ (tct = cis,cis-1,3,5-tris(cinnamylideneamino)cyclohexane) is studied, a process that mimics the enzyme-catalysed reaction. Two viable pathways for the reaction have been traced and key inter-mediates identified. Both direct release of NO or via decomposition of a Cu-NO complex are kinetically and thermodynamically feasible.
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Sameera, W. M. C. "Electronic structure of transition metal ions and clusters." Thesis, University of Glasgow, 2008. http://theses.gla.ac.uk/1389/.

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This thesis uses density functional theory (DFT) to explore the electronic structure and reaction mechanisms of open-shell transition metal ions and clusters. The early part of the thesis (Chapters 2 and 3) is devoted to high-valent metal-oxo species, both mono- and bimetallic, while Chapter 4 describes some aspects of copper-catalysed carbon-carbon bond formation. Finally, Chapter 5 highlights the role of DFT in computing magnetic and spectroscopic properties of exchange-coupled iron clusters. Whilst the chemistry contained in the thesis is rather diverse, the underlying theme of open-shell transition metal ions is common to all chapters. Moreover, we are primarily concerned with the ways in which interactions between two or more adjacent open-shells (either two metals or a metal and a ligand radical) control structure and reactivity. After a brief introduction to relevant theoretical aspects in Chapter 1, we use Chapter 2 to establish a link between the electronic structure of the high-valent Mn(V)=O porphyrin monomer species and their ability to perform oxidation reactions. The reaction profiles for oxidation of a range of substrates depend critically on the electronic structure of the isolated oxidant. Where the electronic ground state is genuinely best described as Mn(V)=O, the interaction between oxidant and substrate is repulsive at large separations, only becoming attractive when the incoming nucleophile approaches close enough to drive an electron out of oxide p manifold. In contrast, where the ground state is better described as an oxyl radical form, Mn(IV)-O.+, the oxidation occurs in sequential one-electron steps, the first of which is barrierless. In Chapter 3, we extend these ideas to bimetallic systems, where the presence of two high-valent manganese centres allows the system to oxidise water. Specifically, we focus on two model systems which have been shown to oxidise water, a Mn-porphyrin-based system synthesised by Naruta and a Mn-based system reported by McKenzie where the ligands contain a mixture of pyridine and carboxylate donors. In both cases, we again find that the emergence of oxyl radical character is the key to the reaction chemistry. However, the radical character is ‘masked’ in the electronic ground states, either by transfer of an electron from the porphyrin ring (Naruta) or by formation of a di-μ-oxo bridge (McKenzie system). In Chapter 4 we turn our attention to copper chemistry, and the role of copper complexes in catalysing atom transfer radical additions (Kharasch additions). In this reaction, the copper cycles between Cu(I) and Cu(II) oxidation states, and the result is the formation of a new C-C bonds. This Chapter makes extensive use of hybrid QM/MM techniques to model the environment of the copper centre in the target polypyrazolylborate-copper complexes (TpxCu). Finally, in Chapter 5 we consider the electronic structure, magnetic and spectroscopic properties of a pair of exchange-coupled Fe3 clusters, [Fe3(μ3-O)(μ-4-O2N-pz)6X3]2- (where pz = pyrazolato, X = Cl, Br). Our primary goal was to establish how well broken-symmetry DFT is able to reproduce the observed Mössbauer spectroscopic parameters, which are extensively used to identify the chemical environments of iron species and, in the case of mixed-valence clusters, to establish the degree of delocalisation of the additional electrons. In recent years DFT has proved able to compute these parameters with encouraging accuracy, but it is not clear to what extent the known deficiencies in broken-symmetry wavefunctions will compromise this ability. Our work suggests that neither the isomer shift nor the quadrupole splitting are strongly influenced by the nature of the coupling between the metal ions, suggesting that broken-symmetry solutions can be used as a basis for computing these parameters in more complex clusters.
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Books on the topic "Structure transition"

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Singh, Sharda Nand. Indian village social structure in transition. New Delhi, India: Commonwealth Publishers, 1991.

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Gubanov, V. A. Electronic structure of refractory carbides and nitrides. Cambridge [England]: Cambridge University Press, 1994.

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Transition metal oxides: An introduction to their electronic structure and properties. Oxford: Clarendon Press, 2010.

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Rao, C. N. R. Transition metal oxides: Structure, properties, and synthesis of ceramic oxides. 2nd ed. New York: Wiley-VCH, 1998.

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Bersuker, Isaac B. Electronic Structure and Properties of Transition Metal Compounds. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470573051.

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Transition metal oxides: An introduction to their electronic structure and properties. Oxford: Clarendon Press, 1992.

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La société algérienne en transition. Alger: Office des publications universitaires, 2004.

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Kikoin, K. A. Transition metal impurities in semiconductors: Electronic structure and physical properties. Singapore: World Scientific, 1994.

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Electronic structure and properties of transition metal compounds: Introduction to the theory. 2nd ed. Hoboken, N.J: Wiley, 2010.

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Electronic structure and properties of transition metal compounds: Introduction to the theory. New York: Wiley, 1996.

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Book chapters on the topic "Structure transition"

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Ferguson, G. "Transition-metal Compounds." In Structure Reports, 904–1686. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-017-3154-6_3.

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Strauch, D. "AlAs: crystal structure, phase transitions, transition pressure." In New Data and Updates for IV-IV, III-V, II-VI and I-VII Compounds, their Mixed Crystals and Diluted Magnetic Semiconductors, 60–61. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-14148-5_44.

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Strauch, D. "InAs: crystal structure, phase transitions, transition pressure." In New Data and Updates for IV-IV, III-V, II-VI and I-VII Compounds, their Mixed Crystals and Diluted Magnetic Semiconductors, 199. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-14148-5_117.

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Strauch, D. "GaP: crystal structure, phase transitions, transition pressure." In New Data and Updates for IV-IV, III-V, II-VI and I-VII Compounds, their Mixed Crystals and Diluted Magnetic Semiconductors, 431–32. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-14148-5_235.

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Strauch, D. "GaSb: crystal structure, phase transitions, transition pressure." In New Data and Updates for IV-IV, III-V, II-VI and I-VII Compounds, their Mixed Crystals and Diluted Magnetic Semiconductors, 440–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-14148-5_240.

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Strauch, D. "InP: crystal structure, phase transitions, transition pressure." In New Data and Updates for IV-IV, III-V, II-VI and I-VII Compounds, their Mixed Crystals and Diluted Magnetic Semiconductors, 524–25. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-14148-5_284.

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Strauch, D. "InSb: crystal structure, phase transitions, transition pressure." In New Data and Updates for IV-IV, III-V, II-VI and I-VII Compounds, their Mixed Crystals and Diluted Magnetic Semiconductors, 535–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-14148-5_292.

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Zhao, Xudong. "Transition of Power Structure." In China Academic Library, 169–202. Berlin, Heidelberg: Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-53834-0_7.

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Bertrán, J., J. M. Lluch, A. González-Lafont, V. Dillet, and V. Pérez. "Transition-State Structures." In Structure and Reactivity in Aqueous Solution, 168–80. Washington, DC: American Chemical Society, 1994. http://dx.doi.org/10.1021/bk-1994-0568.ch012.

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van Beijeren, H., and I. Nolden. "The Roughening Transition." In Structure and Dynamics of Surfaces II, 259–300. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-46591-8_7.

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Conference papers on the topic "Structure transition"

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Liu, Zuolin, Hongbin Fang, Jian Xu, and K. W. Wang. "Triple-Cell Origami Structure for Multistable Transition Sequences." In ASME 2020 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/detc2020-22354.

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Abstract With the infinite design space and the excellent folding-induced deformability, origami has been recognized as an effective tool for developing reconfigurable structures. Particularly, the multistable origami structure, which possesses more than one stable configuration that is distinct in shape and mechanical properties, has received wide research attention. Generally, the origami structure reaches a kinematic singularity point when switching among different stable configurations. At this critical state, multiple switching sequences are possible, and the actual transition is generally hard to predict. In this paper, evolving from the conventional bistable Miura-ori unit, a triple-cell origami structure with eight potential stable configurations is proposed, which serves as a platform for investigating the transition sequences among different stable configurations. To quantify the overall elastic potential of the structure, besides the conventional elastic energy originating from the rigid folding creases, extra elastic potential induced by the mismatch among the cells are introduced, so that folding of the triple-cell structure is no longer a strict single degree-of-freedom mechanism. Instead, the three cells can deform asynchronously to avoid reaching the kinematic singularity point. Hence, under displacement loading, the transition sequence of the multistable structure is predicted by performing optimization on the elastic potential energy. It shows that sequences with multifarious characteristics are possible, including reversible and irreversible transitions, and transitions with symmetric and asymmetric energy barriers. Considering that the fundamental transition mechanisms are of great significance in understanding the quasi-static and dynamic behaviors of multistable structures, the results could be potentially employed for developing morphing structures, adaptive metamaterials, and mechanical logic gates.
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Sarwan, Madhu, V. Abdul Shukoor, and Sadhna Singh. "Structural stability and electronic structure of transition metal compound: HfN." In 2ND INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5032638.

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Bruck, Hugh A. "Processing-Structure-Property Relationships in Hierarchically-Structured Polymer Composites for Multifunctional Structures." In ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59088.

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This research focuses on elucidating on the processing-structure-property relationship in hierarchically-structured polymer composites that are being developed for multifunctional structures. This is accomplished through characterization of the transition in mechanical behavior that occurs across length scales and compositions by: (a) development of model hierarchically-structured composite materials using a combination of model nanoscale and microscale ingredients (carbon nanofibers (CNFs) and carbon microfibers (CMFs)) reinforcing a High Impact Polystyrene (HIPS) thermoplastic polymer that can be extruded or solvent processed, (b) characterization and modeling of the transition compositions in the polymer nanocomposites through melt rheology, and (c) the effect of the CNF on the dynamic compressive behavior of CMF-reinforced polymer composites.
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Gorbatenko, Vadim, Vladimir Danilov, and Lev Zuev. "Elastoplastic transition in the material with sharp yield point." In ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4932748.

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Wołczyn´ski, Waldemar S., Edward Guzik, Wojciech Wajda, and Bogusz Kania. "Columnar → Equiaxed Structure Transition in Solidifying Rolls." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-23048.

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As the first step of simulation, a temperature field for solidifying cast steel and cast iron roll was created. The convection in the liquid is not comprised since in the first approximation, the convection does not influence the analysed occurrence of the C → E (columnar to equiaxed grains) transition in the roll. The obtained temperature field allows to study the dynamics of its behavior observed in the middle of the mould thickness. This midpoint of the mould thickness was treated as an operating point for the C → E transition. A full accumulation of the heat in the mould was postulated for the C → E transition. Thus, a plateau at the T(t) curve was observed at the midpoint. The range of the plateau existence tC ↔ tE corresponded to the incubation period, tCR ↔ tER that appeared before fully equiaxed grains formation. At the second step of simulation, the thermal gradients field was studied. Three ranges were distinguished: a/ for the formation of the columnar structure (the C–zone): (T˙≫0and(G|t<tCR−G|t=tCR)≫0), b/ for the C → E transition (from columnar to fully equiaxed structure): (T˙≈0and(G|t=tCR−G|t=tER)≈0), c/ for the formation of the fully equiaxed structure (the E–zone): (T˙<0and(G|t=tER−G|t>tER)≈0). The columnar structure formation was significantly slowed down during incubation period. It resulted from a competition between columnar growth and equiaxed growth expected at that period of time. The (G|t=tCR − G|t=tER) ≈ 0) relationship was postulated to correspond well with the critical thermal gradient, Gcrit.. A simulation was performed for the cast steel and cast iron rolls solidifying as if in industrial condition. Since the incubation divides the roll into two zones (columnar and equiaxed) some experiments dealing with solidification were made on semi-industrial scale. A macrosegregation equation for both mentioned zones was formulated. It was based on a recent equation for redistribution after back-diffusion. The role of the back-diffusion parameter was emphasized as a factor responsible for the redistribution in columnar structure and equiaxed structure.
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Maslova, O. A., Yu I. Yuzyuk, N. Ortega, A. Kumar, S. A. Barannikova, and R. Katiyar. "Phase transition peculiarities in BaTiO3-based perovskite superlattices." In PROCEEDINGS OF THE ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES. Author(s), 2018. http://dx.doi.org/10.1063/1.5083433.

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Zhang, Jing-ye. "Transition Probability of Chiral Twin Bands." In MAPPING THE TRIANGLE: International Conference on Nuclear Structure. AIP, 2002. http://dx.doi.org/10.1063/1.1517948.

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Becker, J. A. "Nuclear Excitation by Electronic Transition - NEET." In MAPPING THE TRIANGLE: International Conference on Nuclear Structure. AIP, 2002. http://dx.doi.org/10.1063/1.1517962.

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Kaneko, K. "Pairing transition at finite temperature in 184W." In FRONTIERS IN NUCLEAR STRUCTURE, ASTROPHYSICS, AND REACTIONS - FINUSTAR. AIP, 2006. http://dx.doi.org/10.1063/1.2200988.

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Zhi-Yue, Zhang, Ji Wu-Sheng, Sun Fa-Kun, Tong Ying-Yun, and Wang Lin-Nian. "A design of new microstrip-slotline transition structure." In 2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT). IEEE, 2019. http://dx.doi.org/10.1109/icmmt45702.2019.8992556.

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Reports on the topic "Structure transition"

1

Young, L., C. Kurtz, and S. Hasegawa. Hyperfine structure studies of transition metals. Office of Scientific and Technical Information (OSTI), August 1995. http://dx.doi.org/10.2172/166498.

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Selman, Bart. Controlling Computational Cost: Structure, Phase Transition and Randomization. Fort Belvoir, VA: Defense Technical Information Center, July 2004. http://dx.doi.org/10.21236/ada426243.

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Jennison, D. R., P. A. Schultz, M. P. Sears, and T. Klitsner. Electronic and geometric structure of transition-metal nanoclusters. Office of Scientific and Technical Information (OSTI), August 1996. http://dx.doi.org/10.2172/273810.

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Han, Mi-Kyung. Rare-Earth Transition-Metal Intermetallics: Structure-bonding-Property Relationships. Office of Scientific and Technical Information (OSTI), January 2006. http://dx.doi.org/10.2172/888946.

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Han, M. K. Rare-earth transition-metal intermetallics: Structure-bonding-property relationships. Office of Scientific and Technical Information (OSTI), January 2006. http://dx.doi.org/10.2172/882892.

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Chu, B. Phase transition in polymer blends and structure of ionomers. Office of Scientific and Technical Information (OSTI), January 1989. http://dx.doi.org/10.2172/5362446.

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Beck, D. R. Theoretical hyperfine structure constants for transition metal atoms and ions. Office of Scientific and Technical Information (OSTI), March 1993. http://dx.doi.org/10.2172/6642937.

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Krishnan Balasubramanian. Electronic Structure of Transition Metal Clusters, Actinide Complexes and Their Reactivities. Office of Scientific and Technical Information (OSTI), July 2009. http://dx.doi.org/10.2172/959347.

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Miller, Virginia L., and Steven C. Tidrow. Investigations of Transition Metal Oxide with the Perovskite Structure as Potential Multiferroics. Fort Belvoir, VA: Defense Technical Information Center, October 2008. http://dx.doi.org/10.21236/ada487226.

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Beck, D. R. Theoretical hyperfine structure constants for transition metal atoms and ions. Progress report. Office of Scientific and Technical Information (OSTI), March 1993. http://dx.doi.org/10.2172/10142648.

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