Relevant bibliographies by topics / Horizons

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Academic literature on the topic 'Horizons'

Author: Grafiati
Published: 4 June 2021
Last updated: 20 February 2023

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Journal articles on the topic "Horizons"

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BERGAMIN, L., and D. GRUMILLER. "KILLING HORIZONS KILL HORIZON DEGREES." International Journal of Modern Physics D 15, no. 12 (December 2006): 2279–84. http://dx.doi.org/10.1142/s0218271806009571.

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Frequently, it is argued that the microstates responsible for the Bekenstein–Hawking entropy should arise from some physical degrees of freedom located near or on the black hole horizon. In this essay, we elucidate that instead entropy may emerge from the conversion of physical degrees of freedom, attached to a generic boundary, into unobservable gauge degrees of freedom attached to the horizon. By constructing the reduced phase space, it can be demonstrated that such a transmutation indeed takes place for a large class of black holes, including Schwarzschild.
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Lou, Yihuai, Bo Zhang, Tengfei Lin, and Danping Cao. "Seismic horizon picking by integrating reflector dip and instantaneous phase attributes." GEOPHYSICS 85, no. 2 (January 30, 2020): O37—O45. http://dx.doi.org/10.1190/geo2018-0303.1.

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Seismic horizons are the compulsory inputs for seismic stratigraphy analysis and 3D reservoir modeling. Manually interpreting horizons on thousands of vertical seismic slices of 3D seismic survey is a time-consuming task. Automatic horizon interpreting algorithms are usually based on the seismic reflector dip. However, the estimated seismic reflector dip is usually inaccurate near and across geologic features such as unconformities. We are determined to improve the quality of picked horizons using multiple seismic attributes. We assume that seismic horizons follow the reflector dip and that the same horizons should have similar instantaneous phase values. We first generate horizon patches using a reflector dip attribute, which is similar to current methods. We use seismic coherence attribute as the stop criteria for tracking the horizon within each patch. Considering the inaccuracy of reflector dip estimates at and near the discontinuous structures such as fault and unconformities, we use the seismic instantaneous phase attribute to improve the quality of the generated horizon patches. We generate horizons by merging the residual horizon patches and only outputting the best horizon in each iteration. Our method is capable of generating a horizon for each reflection within the 3D seismic survey, and the generated horizons strictly follow the seismic reflections over the whole seismic survey. Finally, each time sample of seismic traces is assigned a chronostratigraphic relative geologic time value according to the tracked horizons.
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Lou, Yihuai, Bo Zhang, Huijing Fang, Danping Cao, Kangning Wang, and Zhizhou Huo. "Simulating the procedure of manual seismic horizon picking." GEOPHYSICS 86, no. 1 (January 1, 2021): O1—O12. http://dx.doi.org/10.1190/geo2020-0021.1.

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Manual seismic horizon picking is the least efficient interpretation technique in terms of time and effort. The loop-tie is a key “element” and the most time-consuming task in manual horizon picking, which ensures the accuracy of horizon picking. Autopicking techniques have been used since the early 1980s. However, there are few studies simulating the procedure of manual seismic horizon picking and quantitatively evaluating the autopicked horizons. In our proposed method, we perform autopicking on inline and crossline seismic vertical slices independently, similar to the manual horizon picking procedure. We then evaluate the picked horizons using a loop-tie step similar to the loop-tie checking in manual horizon picking. To simulate the loop-tie step in manual picking, we define two dip attributes for each time sample of seismic traces, which are the “left” and “right” reflector dips. We only preserve the portions of the tracked horizons that meet the defined loop-tie checking. Next, we merge the tracked horizons centered at the seeded seismic traces. The two-way traveltime of the merged horizons functions as a “hard” control for the final step of autopicking. Finally, we use the seismic dip attribute to track the horizons over the seismic survey under the hard controls. The real data demonstrate that our algorithm can extract accurate horizons near discontinuities such as faults and unconformities.
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Almeida, Jaime Antonio de, Denis Cesar Cararo, and Antônio Ayrton Auzani Uberti. "Genesis of the sombric horizon in ultisols (red argisols) in southern Santa Catarina, Brazil." Revista Brasileira de Ciência do Solo 33, no. 2 (April 2009): 405–16. http://dx.doi.org/10.1590/s0100-06832009000200018.

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Dark subsurface horizons, with properties similar to the sombric horizon characterized by the USA Soil Taxonomy, are frequent in Southern Brazil. The genesis of this horizon is controversial and poorly understood. This study aimed to describe the occurrence of sombric-like horizons in Ultisols in the South of Santa Catarina State, at low altitudes, and suggest possible processes of humus transference, accumulation and persistence in these horizons. Physical, chemical and mineralogical properties of four Ultisols were evaluated; three were sampled in a toposequence, and another representative one in an isolated profile (RSP). The dark subsurface horizons coincide with the AB and BA transitional genetic horizons; they are acid, low in base saturation, and have a similar clay mineralogy in all horizons. Very high amounts of Fe and Al extracted by ammonium oxalate and sodium pyrophosphate solution as well as maximum Al extracted by CuCl2 solution were observed in these dark subsurface horizons, indicating a possible migration of these elements in the form of organometallic complexes. The contents of Al plus ½ Fe extracted from the RSP soil horizons with ammonium oxalate indicated spodic materials in the sombric-like horizon, although the soil morphology was not compatible with Spodosols. Maximum contents of fine clay were also found in the sombric-like horizon, suggesting Fe and Al migration as clay-humic substances. However, the hypothesis that sombric-like horizons in these soils are a relict feature of a grass paleovegetation, different from the current dense seasonal forest, should not be discarded but investigated in further studies.
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Chakraborty, Subenoy, and Subhajit Saha. "A study of different horizons in inhomogeneous LTB cosmological model." Modern Physics Letters A 30, no. 09 (March 11, 2015): 1550024. http://dx.doi.org/10.1142/s0217732315500248.

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This work deals with a detailed study of the dynamics of the apparent, event and particle horizons in the background of the inhomogeneous LTB spacetime. The comparative study among these horizons shows a distinct character for apparent horizon compared to the other horizons. The apparent horizon will be a trapping horizon if its acceleration is positive. The Kodama vector is also defined and its causal character is found to be similar to that in the FRW model.
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Fil’chenkov, M. L., and Yu P. Laptev. "Vacuum Polarization and Particle Creation for Two-Horizon Metrics." Journal of Physics: Conference Series 2081, no. 1 (November 1, 2021): 012018. http://dx.doi.org/10.1088/1742-6596/2081/1/012018.

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Abstract Kerr–Newman and Kottler’s metrics with two horizons are considered. Evaporation of Kerr – Newman’s horizons in Hawking’s effect and Penrose’s process as well as de Sitter’s horizon decay and Schwarzschild’s horizon evaporation for Kottler’s metric have been analyzed in terms of an effective temperature, using lifetimes on the horizons. The results are applied to black hole physics and cosmology.
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Wang, C., G. R. Brewster, and K. T. Webb. "Micromorphological evidence of pedogenetic pathway of a Podzolic Gray Luvisol (Falmouth series) in Nova Scotia." Canadian Journal of Soil Science 75, no. 4 (November 1, 1995): 491–96. http://dx.doi.org/10.4141/cjss95-070.

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A catena of Podzolic Gray Luvisols (Falmouth series) – Gleyed Gray Luvisols (Queens series) – Orthic Gleysols (Kingsville series) is commonly found on fine loamy, weakly calcareous parent materials in Nova Scotia, with Podzolic Gray Luvisols occupying the best drained landscape positions. The hypothesis that podzolic B horizons of Podzolic Gray Luvisols were developed on degraded Bt horizons was investigated by micromorphological characterization of one Podzolic Gray Luvisol pedon. Although not visible in field examinations, argillans were common in thin sections of the Bf and Bm horizons. These argillans were not associated with the walls of voids or the surface of grains. Argillans of the Bt horizons, however, were associated with features such as cracks, vughs, and channels. The upper Bt horizon (i.e., Bt1gj) showed signs of degradation. The pale brown matrix color was more like the Bm horizon above than the dark brown Bt2gj horizon below. The strongly acidic nature of the Bt1gj horizon may have triggered degradation. It is concluded that the Bf and Bm horizons were developed on degraded Bt horizons through the translocation of amorphous Fe and Al and organic matter. Key words: Pedogenesis, micromorphology, Luvisols, bisequal soils
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Baccetti, Valentina, Robert B. Mann, and Daniel R. Terno. "Do event horizons exist?" International Journal of Modern Physics D 26, no. 12 (October 2017): 1743008. http://dx.doi.org/10.1142/s0218271817430088.

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Event horizons are the defining feature of classical black holes. They are the key ingredient of the information loss paradox which, as paradoxes in quantum foundations, is built on a combination of predictions of quantum theory and counterfactual classical features: neither horizon formation nor its crossing by a test body can be detected by a distant observer. Furthermore, horizons are unnecessary for the production of Hawking-like radiation. We demonstrate that when this radiation is taken into account, it can prevent horizon crossing/formation in a large class of models. We conjecture that horizon avoidance is a general feature of collapse. The nonexistence of event horizons dispels the paradox, but opens up important questions about thermodynamic properties of the resulting objects and correlations between different degrees of freedom.
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NIELSEN, ALEX B. "BLACK HOLES WITHOUT BOUNDARIES." International Journal of Modern Physics D 17, no. 13n14 (December 2008): 2359–66. http://dx.doi.org/10.1142/s0218271808014205.

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We discuss some of the drawbacks of using event horizons to define black holes and suggest ways in which black holes can be described without event horizons, using trapping horizons. We show that these trapping horizons give rise to thermodynamic behavior and possibly Hawking radiation too. This raises the issue of whether the event horizon or the trapping horizon should be seen as the true boundary of a black hole. This difference is important if we believe that quantum gravity will resolve the central singularity of the black hole and clarifies several of the issues associated with black hole thermodynamics and information loss.
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Palenzuela, Nilo. "Entre Horizontes Insulares/Among Insular Horizons." Third Text 28, no. 4-5 (August 22, 2014): 345–60. http://dx.doi.org/10.1080/09528822.2014.939838.

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Dissertations / Theses on the topic "Horizons"

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Center, for Spiritan Studies Duquesne University. "Spiritan Horizons Index." Center for Spiritan Studies, Duquesne University, 2013. http://digital.library.duq.edu/u?/sphorizons,1627.

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Studies, Center for Spiritan. "Spiritan Horizons v.02." Duquesne University, 2007. http://digital.library.duq.edu/u?/sphorizons,1046.

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Issue 2 -- Contents -- Fall 2007 -- Introduction -- (pg. 2) -- WELLSPRINGS -- The Cause for the Beatification of the Servant of God Claude-François Poullart Des Places -- Jean Savoie, C.S.Sp. -- (pg. 3) -- Freedom and Independence -- Christy Burke, C.S.Sp. -- (pg. 11) -- François Libermann and his Family -- Arsène Aubert, C.S.Sp. -- (pg. 19) -- Lao Tzu and Francis Libermann on Living the Mystery -- Binh The Quach, C.S.Sp. -- (pg. 37) -- SOUNDINGS -- Inculturation and the Spiritan Charism -- Elochukwu E. Uzukwu, C.S.Sp. -- (pg. 50) -- “Third Church” Mission in the “First World” -- James Chukwuma Okoye, C.S.Sp. -- (pg. 63) -- Constructing a Spiritan Spirituality of Justice, Peace, and the Integrity of Creation -- John Kilcrann, C.S.Sp. -- (pg. 71) -- EDUCATION -- The Spirit and Teaching -- William Thompson-Uberuaga -- (pg. 79) -- The Mission and Identity of Spiritan Schools in Ireland -- Thomas M. Farrelly, C.S.Sp. -- (pg. 94) -- LIVED EXPERIENCE -- On the Royal Road -- Considerations on Lay Spiritan Identity and Mission -- Ann-Marie and Peter Fell -- (pg. 100) -- Youth Evangelizing Youth- The Spiritan Charism in Brazil -- José Altevir da Silva, C.S.Sp. -- (pg. 109) -- From Mozambican Refugee to a Spiritan Missionary -- João Luis Dimba, C.S.Sp. -- (pg. 114) -- POEM -- Lake Mollyalup -- Maxime Fumagalli -- (pg. 119)
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Studies, Center for Spiritan. "Spiritan Horizons v.04." Duquesne University, 2009. http://digital.library.duq.edu/u?/sphorizons,1167.

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Issue 4 -- Contents -- FALL 2009 -- (pg. 2) -- Introduction -- WELLSPRINGS -- (pg. 3) -- What can we Learn from Poullart des Places in 2009? -- Eamonn Mulcahy, C.S.Sp. -- (pg. 13) -- Origins of the Spiritan Consecration to the Holy Spirit on May 27, 1703 -- Christian de Mare, C.S.Sp. -- (pg. 23) -- Poullart des Places and the Reform of the Clergy -- Adélio Torres Neiva, C.S.Sp. -- SOUNDINGS -- (pg. 35) -- Wealth, Poverty, and Vocation in the Life and Times of Claude-François Poullart des Places -- Jotham Parsons, Ph.D. -- (pg. 51) -- Evangelization of Slaves: A Moral Misstep? -- Paul Kollman, CSC -- (pg. 66) -- Spiritan Mission to South-East Asia – Ten Years On -- Brian McLaughlin, C.S.Sp. -- EDUCATION -- (pg. 77) -- Evaluating the Ethos in Our Spiritan Schools and Colleges -- Cormac O’Brolchain, C.S.Sp. -- (pg. 84) -- Attentive Listening and Respectful Intervention The SERVOL Story -- Sister Ruth Montrichard, SJC -- (pg. 91) -- Moments of Revelation on the Spiritan Journey -- Fintan Sheerin -- LIVED EXPERIENCE -- (pg. 102) -- Spiritan Mission in the Context of South Africa -- Sylvester Kansimbi, C.S.Sp. -- (pg. 110) -- Creole Mission in the Footsteps of Blessed Jacques Desire Laval -- Jocelyn Gregoire, C.S.Sp.
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Studies, Center for Spiritan. "Spiritan Horizons v.05." Duquesne University, 2010. http://digital.library.duq.edu/u?/sphorizons,1292.

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ISSUE 5 -- Contents -- FALL 2010 -- (pg. 2) -- Introduction -- WELLSPRINGS -- (pg. 3) -- Libermann in Conflict with the Authorities -- Arsène Aubert, C.S.Sp. -- (pg. 19) -- A Merger, an Attempted Takeover...Turning Points in the Spiritan Story -- Michael Kilkenny, C.S.Sp. -- (pg. 34) -- Joachim Alves Correia, C.S.Sp., -- Champion of the Poor on Three Continents -- Adélio Torres Neiva, C.S.Sp. -- SOUNDINGS -- (pg. 45) -- Spiritans and Inter-Religious Dialogue with Particular Emphasis on Spiritans and Islam -- Mgr. Augustine Shao -- (pg. 58) -- Into Africa -- Christopher Duncan -- EDUCATION -- (pg. 69) -- Duquesne University of the Holy Spirit -- Charles Dougherty -- (pg. 80) -- Creating a Spiritan Library -- Laverna Saunders & Robert Behary -- (pg. 92) -- "The Heart and Soul of the Multitude of Believers was One." The Acts of the Apostles and the Spiritan Motto -- (pg. 92) -- Séan Kealy, C.S.Sp. -- LIVED EXPERIENCE -- (pg. 104) -- Human Rights — A Simmering Pot -- Edward Flynn, C.S.Sp. -- (pg. 113) -- The Intentions of Venerable -- Francis Libermann -- Luke Mbefo, C.S.Sp.
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Studies, Center for Spiritan. "Spiritan Horizons v.06." Duquesne University, 2011. http://digital.library.duq.edu/u?/sphorizons,1391.

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Issue 6 -- Fall 2011 -- Contents -- Introduction -- (pg. 3) -- Wellsprings -- Francis Libermann's Trust In Providence -- Christian de Mare, C.S.Sp. -- (pg. 5) -- Bagamoyo and the Spiritans -- Florentine Mallya, C.S.Sp. -- (pg. 5) -- To Pray Continually and Not Lose Heart -- John O'Brien, C.S.Sp. -- (pg. 25) -- Soundings -- Existential Civility: Leaning Forward into the Rapids -- Ronald Arnett -- (pg. 39) -- Freedom (Poem) -- Desmond Egan -- (pg. 49) -- Legal Pluralism and Shari'ah Law -- Susan Hascall -- (pg. 51) -- Education -- Duquesne Law School 1911 -- 2011 -- Ken Gormley -- The Potential of Nonformal Education for Spiritan Mission -- George Boran, C.S.Sp. -- (pg. 75) -- Lived Experience -- Spiritan Now -- Pierre Jubinville, C.S.Sp. -- (pg. 87) -- That Elusive "Something" -- Adam Wasilko -- (pg. 91)
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Studies, Center for Spiritan. "Spiritan Horizons v.01." Duquesne University, 2006. http://digital.library.duq.edu/u?/sphorizons,796.

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ISSUE 1 -- Contents -- FALL 2006 -- Introduction-- (pg. 2) -- WELLSPRINGS -- (pg. 3) -- Claude Poullart Des Places -- How a young man became a founder -- Jean Savoie, C.S.Sp. -- (pg. 3) -- The Spirituality of Francis Libermann: A Man Beyond His Time -- David L. Smith, C.S.Sp. -- (pg. 11) -- Prayer for Busy People -- Some insights and advice from Francis Libermann -- John Fogarty, C.S.Sp. -- (pg. 23) -- Practical Union and the Crestfallen God -- Bernard Kelly, C.S.Sp. -- SOUNDINGS -- (pg. 29) -- Root, Shoot, and Fruit: From Missio Dei to Mission Today -- Anthony J. Gittins, C.S.Sp. -- (pg. 32) -- Re-Inventing the Spiritan Charism for Contemporary Mission -- Casimir Eke C.S.Sp. -- (pg. 40) -- Good News to the Poor -- A Commentary on Lk 4: 16-30 -- Sean Kealy, C.S.Sp. -- EDUCATION -- (pg. 48) -- A Framework for a Spiritan University -- Janie M. Harden Fritz / John Sawicki, C.S.Sp. -- (pg. 53) -- “I am the vine, you are the branches...” -- Bringing the Spiritan Charism into the Laboratory -- Bruce Beaver -- LIVED EXPERIENCE -- (pg. 69) -- A Journey that Shaped our Lives -- Reflections of a Lay Spiritan -- Gary Warner -- (pg. 76) -- Silence -- Cothrai Gogan, C.S.Sp. -- (pg. 84) -- Spiritan Spirituality -- A Latin-American Perspective -- Pádraig Leonard, C.S.Sp. -- (pg. 85) -- From Brazil to Bolivia -- A Journey of Discovery -- Maria Jesús de Souza -- (pg. 94)
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Studies, Center for Spiritan. "Spiritan Horizons v.03." Duquesne University, 2008. http://digital.library.duq.edu/u?/sphorizons,919.

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Issue 3 -- Contents -- FALL 2008 -- (pg. 2) -- Introduction -- WELLSPRINGS -- (pg. 3) -- Claude-François Poullart Des Places The Shaping of a Vocation -- Christian de Mare, C.S.Sp. -- (pg. 11) -- Libermann’s Spirituality: A Spirituality of Presence -- David L. Smith, C.S.Sp. -- (pg. 29) -- “Walk in the Shoes of the Semite” -- Donald S. Nesti, C.S.Sp. -- (pg. 37) -- Apostolic Life -- Tony Geoghegan, C.S.Sp. -- SOUNDINGS -- (pg. 50) -- Consecration to the Apostolate -- Cornelius van der Poel, C.S.Sp. -- (pg. 57) -- A New Spring For The Congregation -- Frans Timmermans, C.S.Sp. -- (pg. 69) -- Holy Ghost in the Highlands: The Spiritans on Kilimanjaro, 1892-1953 -- Matthew V. Bender, Ph.D. -- EDUCATION -- (pg. 90) -- Blessed Daniel Brottier–A Born Educator François Nicolas, C.S.Sp. -- (pg. 98) -- “It is the Spirit Who Gives Life” (Jn. 6:63) -- Séan P. Kealy, C.S.Sp. -- LIVED EXPERIENCE -- (pg. 107) -- Keeping the Spiritan Heritage Alive -- Guy Tapin -- (pg. 110) -- Living Out African Vision in Asian Mission -- Chibuike Ojilere, C.S.Sp. -- (pg. 119) -- To a Missionary Who Died at Home -- Cothrai Gogan, C.S.Sp.
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Martínez, Montero Marina. "Studies of Black Hole Horizons." Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/396271.

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This thesis has focused entirely on classical and thermodynamical aspects of black hole physics. We have developed four different projects involving different kinds of black holes. 1 BLACK BRANES IN A BOX Neutral black branes with extended horizons are dynamically unstable to long wavelength perturbations along their horizons; this instability is known as the Gregory-Laflamme instability. In some regimes, the dynamics of black branes can be captured by an effective hydrodynamic description. We have studied the effective hydrodynamics of neutral black branes inside a cylindrical cavity to investigate their dynamic and thermodynamic instabilities. We have used the size of the box as a control parameter for stability (smaller cavities increase rigidity and contribute to the stability of the solutions); we have ob¬served that both instabilities disappear at the same critical value of the cavity radius. We have discussed the Correlated Stability Conjecture, which relates thermodynamic and dynamic instabilities in these objects and we have argued that its correct interpretation is given by the Correlated Hydrodynamic Stability (CHS). The CHS relates the presence of unstable hydrodynamic modes to the local thermodynamic instability; this is transparent in our approach. In the effective fluid description we have computed the specific quantities that characterize the fluid. Finally we have studied the system close to the critical point at which the instability disappears and we have obtained that the wave number that marks the onset of the instability vanishes with a critical behaviour ruled by a critical exponent of 1/2. 2 BLACK STRING FLOW We have constructed an event horizon describing a heat flow, that remains constant in time, between to asymptotic regions at constant temperature. This horizon is the smooth interpolation between the horizon of a black string and a planar acceleration horizon. This was the first exact description of a flowing horizon connecting a stringlike horizon with a planar one (this can also be an infinitely big spherical black hole); the construction is valid for any number of dimensions greater than four. We obtained the horizon generators as well as the exact geometry and we showed that this horizon resembles that of flowing funnels. We computed a surface gravity that approaches on one end, the black string's surface gravity, and on the other, the infinite black hole's surface gravity which is 0. We also computed the expansion associated to the horizon generators and it vanishes in both asymptotic regions; thus reflecting the property that the black string flow horizon interpolates between two asymptotic horizons, each of which is asymptotically in equilibrium at different temperature. This construction shows that stationary black holes with non-killing horizons are possible with non-AdS asymptotics. 3 BUMPY BLACK HOLES We have constructed numerically three new families of stationary black holes with a single angular momentum. These black holes have spherical topology but they differ from the Myers Perry solution (higher dimensional generalisation of Kerr solution) in that the radius of the sphere transverse to rotation varies non-monotonically with the polar angle. We have seen that half of these solutions connect, in the space of solutions, the Myers Perry family with other families featuring non-spherical topology such as the black ring, the black saturn, etc. We found strong evidence for the presence of cones in the horizons of solutions close to the topological transition in solution space. The other half of the solutions spread widely in the rotation plane and develop a singularity along their equator. These probably do not connect to other stationary black hole branches. We have also studied stability properties of all branches. 4 BLACK HOLE MERGER We have described in an exact analytic way the event horizon of a black hole merger in the extreme mass ratio (EMR) limit; we have done it for four and five dimensions. Curiously numerical computation in which the ratio of the masses is large are difficult and not very well studied. We hope our exact result can serve as check/guide for future results in the area. We constructed the event horizon of this dynamical process by computing its null generators. We extracted a number of parameters that characterise the merger. We identified the line of caustics, the critical radius at which both horizons touch, the big horizon relaxation timescale among other things. We showed that our hypersurface describes all possible mergers, in the EMR limit, for which the small black hole is non-rotating. Finally we analysed the instants shortly before and after the pinch-on and found evidence for critical behaviour in the forming of the cusp and in the initial growth of the throat.
Esta tesis está enmarcada en el campo de los agujeros negros. En ella se han realizado cuatro proyectos que involucran diferentes tipos de agujeros negros. 1 BRANAS NEGRAS Hemos estudiado el sistema de una brana dentro de una cavidad cilíndrica con condiciones de Dirichlet para investigar la relación entre las inestabilidades dinámicas y termodinámicas presentes en la brana. Hemos empleado las técnicas de la teoría efectiva de worldvolumes para tiranas; en esta teoría la descripción del sistema (en algunas condiciones) se da a través de variables y ecuaciones hidrodinámicas. Hemos estudiado el cambio de la inestabilidad de Gregory-Laflamme al variar el radio de la caja. Hemos identificado el radio crítico que estabiliza las soluciones y el comportamiento crítico de la inestabilidad en ese punto. 2 AGUJEROS NEGROS QUE FLUYEN Hemos construido un horizonte de sucesos que describe un flujo de calor, constante en el tiempo, entre dos regiones asintóticas a temperatura constante. Este horizonte es la interpolación entre el horizonte de una cuerda negra y un horizonte planar. La cuerda negra tiene cierta temperatura y el horizonte planar, en este caso, está a temperatura cero. La construcción se ha hecho en espacio asintóticamente plano, mostrando así que una constante cosmológica negativa no es estrictamente necesaria para la existencia de agujeros negros estacionarios con que no son de Killing. 3 AGUJEROS NEGROS BUMPY Hemos construido numéricamente tres familias nuevas de agujeros negros estacionarios con un solo momento angular en seis dimensiones. Estos agujeros tienen topología esférica pero el radio de la esfera transversa a la rotación varía de manera no monótona a lo largo del ángulo polar. La mitad de estas soluciones conectan a la familia de Myers Perry con otras de topología no esférica como el anillo negro o el saturno negro, etc. La otra mitad, se extienden mucho en el plano de rotación y acaban por tener una singularidad localizada en el ecuador. 4 FUSIÓN DE AGUJEROS NEGROS Para el caso en que las masas de dos agujeros negros difieran mucho una de la otra hemos mostrado que una descripción analítica del proceso de fusión de dos agujeros negros es posible. Hemos obtenido los rayos de luz que generan el horizonte de sucesos de una colisión de agujeros negros en el límite de razón de masas extremas. Extraemos propiedades importantes y damos una caracterización muy completa del proceso de fusión.
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Wong, Chun-yin, and 黃俊賢. "Narrative as "Fusion of horizons"." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B43946963.

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Warrell, Lindy. "Cosmic horizons and social voices." Title page, contents and preface only, 1990. http://hdl.handle.net/2440/37900.

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The fieldwork on which this dissertation is based was done in Sri Lanka from 1984 to 1986 when the critique of the of the anthropologist as 'Knower of the Other' was surfacing in the literature (Fabian, 1983, Clifford and Marcus, 1986, Marcus and Fisher 1986). When I returned from the field most works of this genre were generally unknown in Adelaide. However, I began by writing with the insights of Bakhtin who himself had inspired central dimensions of the burgeoning critique of anthropological practice. Like Bakhtin's work, the debates about ethnographic authority continue to invite us to reflect upon the methods employed in the production of any text which claims to define the world of others. It therefore seems appropriate for me to preface this dissertation by highlighting relevant features of the processes which have culminated in this work, Cosmic Horizons and Social Voices. The nature of my fieldwork was distinctive. I did not work in a spatially constrained community. Rather my work was anchored by the work of specialist ritual practitioners, both deity priests and performers. Because the practitioners themselves not only live in dispersed locations but are also highly mobile in relation to the work that they do, my work entailed extensive travel in and between urban centres and rural areas across several provincial divisions. In the course of eighteen months of this kind of fieldwork, I attended in excess of fifty rituals of different types and scale. Over time, I developed personalized networks with more than fifty ritual practitioners privileging me to a broad span of rituals. I worked regularly, and often intimately, with a core of five priests and ten performers to give depth to my understandings. Many of these practitioners appropriated me to themselves at rituals where they publicly announced the purpose of my presence to ritual audiences as being to document Sinhala culture. I was claimed by them as 'our madam' ('ape noona') and as a university lecturer, which they knew very well I was not. This public acknowledgement legitimated my documentation of performances which were, after all, paid for by others. It also had the effect that the sponsors largely treated me as a member of the performing troupe. My growing familiarity with ritual practitioners had the further ramification that some of them insisted that I discuss the meanings of the rituals I documented with those people whom they considered specialists in their field. Soon, therefore, in addition to attending rituals, I spent a great deal of my time entertaining, and being entertained by, ritual specialists with whom I discussed deeper levels of their knowledge and work. In this way, and through my own unique constellation of relationships, I accumulated ritual knowledge, albeit at the theoretical, not practical, level. Some people shared esoteric and valued information with me that they would not disseminate to others with whom they were in competition. This field exercise provided a singular vantage point from which I have interpreted Sinhalese Buddhist ritual practices. While the final selection of rituals interpreted in the dissertation is mine, and represents only aspects of the larger body of knowledge carried collectively by Sri Lanka's ritual practitioners, the interpretations are based not simply on my observations, but on this body of knowledge which was shared with me even as it was constantly discussed, disputed, disseminated and transformed by ritual practitioners. My understandings of the meanings of ritual were consolidated in both quasi-formal and informal social settings, at my home and theirs, with people renowned as ritual experts by their peers. I collected ritual knowledge like ritual practitioners, in bits and pieces from different people. And, like practitioners who publicly acknowledge only one gurunnanse, I acknowledge mine formally, in the public arena of my own world, in the Introduction. There is another dimension of my field experience that I want to mention before discussing how it was metamorphosed by writing. My three children, Grant, Vanessa and Mark accompanied me to Sri Lanka at the ages of 9, 11 and 12 respectively. Their beautiful, inquisitive and effervescent youth attracted many people to us as a family which meant that they became wonderful sources of new friends and colloquial information. Both of the boys were fascinated with the unique rhythms of Sri Lanka's ritual music and dance and before long, they were keen to learn these for themselves. Grant was deeply disappointed that he could not because, like Vanessa, he was committed to his schooling and, even at 12, he was taller than many of the ritual practitioners. Mark was younger and, in any case, of a much smaller build so he became a pupil of Elaris Weerasingha, a ritual practitioner with international fame, who became my husband. Mark left school to work with Elaris and his sons, often at rituals other than those I attended. With Elaris as his gurunnanse, Mark made his ritual debut just as novice Sinhala performers do. The Sri Lankan press discovered this unique cross-cultural relationship in late December 1986 just as we were preparing to return to Australia. Memorable photographs appeared in both English language and Sinhala papers accompanied by full-page stories praising Elaris for his teaching and acclaiming Mark for proficiency in dance and fluency in Sinhala language and verse. We were delighted. Mark and Elaris continued to perform together in Adelaide at the Festival of Arts, on television and at multicultural art shows before Elaris returned to Sri Lanka to live for family reasons early in 1988. I remember Elaris for both the joy of our union and the pain of our parting. I want to thank him here for sharing his culture with us and especially for the way he supported me to believe in my understandings of the rituals he knew so well. I transcribed my field experience with the help of Bakhtinian insights. The rituals I studied are analysed for their performative value under the heading Cosmic Horizons with faithful reference to what their producers, including Elaris, consider to be one of their most important dimensions if they are to be efficacious; where and when they should occur. I call these facets of ritual their time-space co-ordinates and I employ Bakhtin's conception of the chronotype, in conjunction with practitioner's naming practices, to give them the analytical emphasis they deserve. Using elaborations of ritual meanings articulated to me by ritual specialists and colloquial understandings of words rather than their linguistic etymologies, I variously explore the chronotopic dimensions of the names of supernatural. beings, myths, ritual boundaries and segments to render explicit those unifying symbolic dimensions of a ritual corpus which would otherwise remain implicit to all except ritual practitioners. In particular, the Bakhtinian conceptions I use to analyse ritual serve to reveal and crystallize an integral relationship between the time-space co-ordinates inherent in ritual performance and the oscillations of the sun, moon and earth. Part 1 is my synthesis but it is based on the time-space co-ordinates of ritual; it is deliberately constructionist but it elaborates what I learned from ritual practitioners in the ways I have described. Part 2 is deconstructionist, it is an attempt to represent rituals as events with complex and indirect discursive reference to the elegant symbolic dimensions of the ritual performances themselves. As its title, Social Voices, suggests, Part 2 of the thesis privileges discourse about ritual - by ritual practitioners, ritual sponsors, Buddhist monks, the media and scholars - above the structural symmetry or chronotopic logic of the ritual corpus. It is in this domain, just to offer one example, that religion (agama) is distinguished from culture (sanskruthaiya) and exploited to make value judgements about people's participation in orthodox or unorthodox ritual practices, a judgement which is a possibility of the comic horizons constituted in ritual but which is not, as I argue, determined by them. This dissertation is ultimately an attempt to represent, in written form, fragments of an-Other world through a prosaic Bakhtinian focus on the way particular people named and talked about that world to me. Although I chose not to identify individuals in the text for personal reasons, my methodology is purposeful, giving value to Sinhalese performative ritual as the product of specialist knowledge. And, in keeping with the new imperatives for writing ethnography, this preface describing my field experience is intended to make explicit the way the dissertation explores its foundation in relationships between Self and Other, Observer and Observed, without abrogating the responsibility of authorship. Not pretending to be the voice of the Other, Cosmic Horizons and Social Voices is my voice, echoing the voice of Sri Lanka as it spoke to me.
Thesis (Ph.D.)--School of Social Sciences, 1990.
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Books on the topic "Horizons"

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Fulton, Hamish. Thirty one horizons =: Einunddreissig Horizonte. München: Lenbachhaus, 1995.

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Schat, Anneke. Horizon in beweging =: Horizons in motion. Amsterdam: Ploegsma, 1989.

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Hart, Catherine. Horizons. New York: Zebra, 1997.

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Manley, Joan H. Horizons. 2nd ed. Australia: Heinle & Heinle, 2002.

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Manley, Joan H. Horizons. 5th ed. Boston, Mass: Heinle Cengage Learning, 2012.

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Shaw, Luci. Horizons. Grand Rapids, Mich: Zondervan Pub. House, 1992.

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Greenall, Simon. Horizons. London: Heinemann, 1987.

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Hart, Catherine. Horizons. New York: Zebra Books, 1997.

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H, Manley Joan, ed. Horizons. Boston, Mass., U.S.A: Heinle & Heinle, 1998.

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Horizons. New York: Tor, 2007.

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Book chapters on the topic "Horizons"

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Antenucci, John C., Kay Brown, Peter L. Croswell, Michael J. Kevany, and Hugh Archer. "Horizons." In Geographic Information Systems, 264–75. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-3934-6_12.

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Faraoni, Valerio. "Horizons." In Cosmological and Black Hole Apparent Horizons, 25–57. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19240-6_2.

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Unger, F. "Horizons." In Assisted Circulation 4, 355. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-79340-0_32.

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Cooley, D. A. "Horizons." In Assisted Circulation 4, 356–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-79340-0_33.

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Watson, J. T. "Horizons." In Assisted Circulation 4, 368–71. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-79340-0_35.

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Ochsner, J. "Horizons." In Assisted Circulation 4, 372–74. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-79340-0_36.

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Björk, V. O. "Horizons." In Assisted Circulation 4, 375–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-79340-0_37.

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Wada, J., and W. R. Ade. "Horizons." In Assisted Circulation 4, 377–79. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-79340-0_38.

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Antenucci, John C., Kay Brown, Peter L. Croswell, Michael J. Kevany, and Hugh Archer. "Horizons." In Geographic Information Systems, 264–75. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-6533-4_12.

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O’Sullivan, John. "Horizons." In European Missions to the International Space Station, 225–61. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-30326-6_10.

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Conference papers on the topic "Horizons"

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Lewandowski, Jerzy, Adam Szereszewski, and Piotr Waluk. "When Isolated Horizons met Near Horizon Geometries." In Second LeCosPA International Symposium: Everything about Gravity. WORLD SCIENTIFIC, 2017. http://dx.doi.org/10.1142/9789813203952_0087.

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Hooft, Gerard ’t. "Horizons." In Proceedings of the International School of Subnuclear Physics. WORLD SCIENTIFIC, 2005. http://dx.doi.org/10.1142/9789812701794_0008.

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Grothaus, Grace. "Projected Horizons." In C&C '19: Creativity and Cognition. New York, NY, USA: ACM, 2019. http://dx.doi.org/10.1145/3325480.3329186.

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Conde, Miguel Á., Ángel Hernández-García, and Amílcar Oliveira. "Endless horizons?" In the 3rd International Conference. New York, New York, USA: ACM Press, 2015. http://dx.doi.org/10.1145/2808580.2808619.

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Grigorova-Pesheva, Bilyana, Biser Hristov, and Kameliya Petrova. "ANALYSIS OF THE MICROBIOLOGICAL CHARACTERISTICS OF THE DIFFERENT SOIL HORIZONS OF FOREST SOILS FROM THE TERRITORY OF VITOSHA NATURE PARK." In 22nd SGEM International Multidisciplinary Scientific GeoConference 2022. STEF92 Technology, 2022. http://dx.doi.org/10.5593/sgem2022/3.1/s14.41.

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The status, abundance and diversity of soil microbial communities are one of the main basic indicators for the assessment and monitoring of forest ecosystems. In the context of the important role that microorganisms play in forest ecosystems, it is crucial to study and monitor their abundance in soil habitats. In order to supplement the knowledge about the soil microbial communities in the different soil horizons, we studied 16 soil profiles from the territory of Vitosha Nature Park. The soils from tested areas 1-8 are determined as Dystric Cambisols and the soils form tested areas 9-16 as Umbrisols. The main soil characteristics: pH, total nitrogen content, humus and organic carbon content have been studied using standard laboratory analyses. The total microbial number of the individual soil horizons have been established respectively for the Dystric Cambisols A and B horizons, for the Umbrisols A1 and A horizons. The Koch method was used. The percentage distribution of the main microbial groups: spore-forming and non-sporeforming microorganisms, actinomycetes and micromycetes have been determined. For all studied soils, a decrease in the total microflora with an increase in the depth of the soil profile was found. In Umbrisols this decrease is less compared to Dystric Cambisols. In both soil types, the results show a significant reduction in the group of micromycetes in the underlying soil horizon, regardless of soil type. In soils with higher acidity, a higher percentage of the micromycetes is observed, regardless of soil type and soil horizon. Higher values of the correlation coefficient were found when comparing the microbial abundance in the lower soil horizons with the humus content, compared to the upper soil horizons.
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Dunn, Robert. "HORIZONS by TeleCommunity." In ACM SIGGRAPH 97 Visual Proceedings: The art and interdisciplinary programs of SIGGRAPH '97. New York, New York, USA: ACM Press, 1997. http://dx.doi.org/10.1145/259081.259203.

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Jatowt, Adam, Émilien Antoine, Yukiko Kawai, and Toyokazu Akiyama. "Mapping Temporal Horizons." In WWW '15: 24th International World Wide Web Conference. Republic and Canton of Geneva, Switzerland: International World Wide Web Conferences Steering Committee, 2015. http://dx.doi.org/10.1145/2736277.2741632.

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Howell, A. "Inmarsat Horizons program." In IEE Colloquium on Communication Opportunities Offered by Advanced Satellite Systems - Day 1. IEE, 1998. http://dx.doi.org/10.1049/ic:19980882.

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Chatterjee, Ayan, and Aalok Misra. "Weak Isolated Horizons." In THEORETICAL HIGH ENERGY PHYSICS: International Workshop on Theoretical High Energy Physics. AIP, 2007. http://dx.doi.org/10.1063/1.2803792.

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Syed, Bilal Saeed, Jagannath Mukherjee, Tadeo Ditia, Abdulla Seliem, Abdulla Saad Al Kobaisi, Ben Andrews, Alejandro Jaramillo, and Phil Norlund. "Interpreting Subtle Faults and Multiple Horizons Layers Using Machine Learning and Data Driven Approach." In ADIPEC. SPE, 2022. http://dx.doi.org/10.2118/211707-ms.

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Abstract The Lower Cretaceous Thamama Group is one of the proven and productive hydrocarbons bearing intervals within Abu Dhabi area. The geological setting of Thamama Group is complex due to the nature of its structural evolution in a strike-slip regime with high-angle fault and subtle vertical displacement. Additionally, the stratigraphy of Thamama Group consists of multiple stacks of Carbonate reservoirs which are separated by various Anhydrite layers. Some of the carbonate layer cannot be interpreted properly due to data resolution and quality of the seismic reflector. Due to the geological complexities, using the existing 3D Seismic Data to interpret faults and horizons within due time frame for critical decision making can be extremely challenging. Vertical displacement of the fault often cannot be easily recognized from seismic section and auto-tracking horizon interpretation doesn't produce a good result due to lack of reflector continuity. In the specific area of this study, the main geological challenge was to interpret those N45W subtle faults developed at the central region of the seismic volume. To address this challenge, we first applied one of the existing machine-learning models proposed by Jiang and Norlund (2020) to pre-train a multi-channel convolutional neural network model with a set of synthetic seismic volumes (over 200 different cases), that resembles multiple geological scenarios with similar structural characteristics to those observed in the study area. We utilize a new point-based method that leverages a network analysis technique to automatically extract fault surfaces from fault imaging volumes. For horizon interpretation we use a new Assisted Horizon Interpretation workflow we are developing. This approach is good for identifying and tracking larger, more continuous surfaces throughout a seismic volume. This results in many output horizons that fill the entire seismic cube, we refer to this as “Dense Horizon” extraction. This portion of the project uses a deterministic approach for identifying & tracking patches throughout the entire seismic volume & then uses several automated and manual tools to join those patches to generate complete surfaces. The results achieved with this study helped to improve the quality of faults and horizon generation in complex geological area with improved efficiency and accuracy.
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Reports on the topic "Horizons"

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Kiyotaki, Nobuhiro, John Moore, and Shengxing Zhang. Credit Horizons. Cambridge, MA: National Bureau of Economic Research, April 2021. http://dx.doi.org/10.3386/w28742.

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Harrison, Sarah, Shamit Kachru, and Huajia Wang. Resolving Lifshitz Horizons. Office of Scientific and Technical Information (OSTI), April 2012. http://dx.doi.org/10.2172/1039184.

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Kaminski, Paul G. Horizons in Armaments Cooperation,. Fort Belvoir, VA: Defense Technical Information Center, March 1996. http://dx.doi.org/10.21236/ada340879.

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Durling, P. W. Seismic reflection interpretation of the Carboniferous Cumberland Basin, Northern Nova Scotia. Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/331223.

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An interpretation of approximately 1700 km of seismic data was completed in 1996. The seismic analysis, together with well information and geological map data, were used to map thirteen seismic horizons in the Cumberland Basin. Ten of the horizons were mapped only in limited areas, whereas three horizons could be mapped regionally. These are: BW (base of the Windsor Group), BP (base of the Boss Point Formation), and PG (base of the Pictou Group). The BW horizon is the deepest regional horizon mapped. The horizon generally dips southerly toward the Cobequid Highlands. It is affected by faults adjacent to the Scotsburn Anticline and the Hastings Uplift; the horizon was not recognized over part of the uplift. On the seismic reflection data, the horizon varies between 500 ms and 3200 ms two-way travel time (approximately 800-7600 metres) and rocks corresponding to this horizon do not outcrop in the basin. The BP and PG horizons can be traced to outcrop on the flanks of the major anticlines. Time structure maps of these horizons mimic the distribution of synclines mapped from outcrop geology. The BP horizon is affected by more faults and is more tightly folded than the PG horizon south of a major fault (Beckwith Fault). North of the Beckwith Fault, both horizons are essentially flat and not deformed. Several geological relationships were documented during this study. A thick (up to 1600 m) clastic unit was recognized in the central portion of the southern margin of the Cumberland Basin. It is interpreted as Windsor Group equivalent. Seismic reflections from within the Falls and Millsville conglomerates were recognized and suggest that these rocks correlate with the Windsor Group. Seismic profiles that cross the southern margin of the Cumberland Basin image parts of the asement complex to the south of the basin (Cobequid Highlands) and show reflection patterns consistent with mountain fronts. The seismic data image the folded and faulted Cobequid Highlands basement complex, which is interpreted as a thrusted structural wedge.
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Hall, Bronwyn. Corporate Restructuring and Investment Horizons. Cambridge, MA: National Bureau of Economic Research, July 1991. http://dx.doi.org/10.3386/w3794.

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Froot, Kenneth. Currency Hedging over Long Horizons. Cambridge, MA: National Bureau of Economic Research, May 1993. http://dx.doi.org/10.3386/w4355.

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Williams, N. Nouveaux horizons et nouvelles techniques de pointe. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1995. http://dx.doi.org/10.4095/203592.

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Research Institute (IFPRI), International Food Policy. New horizons: Nutrition in the 21st century. Washington, DC: International Food Policy Research Institute, 2016. http://dx.doi.org/10.2499/9780896295889_19.

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Froot, Kenneth, Andre Perold, and Jeremy Stein. Shareholder Trading Practices and Corporate Investment Horizons. Cambridge, MA: National Bureau of Economic Research, February 1991. http://dx.doi.org/10.3386/w3638.

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Tobis, M., I. T. Foster, and C. M. Schafer. FOAM: Expanding the horizons of climate modeling. Office of Scientific and Technical Information (OSTI), October 1997. http://dx.doi.org/10.2172/539831.

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