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Relevant bibliographies by topics / Bondi gauge

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Academic literature on the topic 'Bondi gauge'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Bondi gauge"

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Poole, Aaron, Kostas Skenderis, and Marika Taylor. "(A)dS 4 in Bondi gauge." Classical and Quantum Gravity 36, no. 9 (2019): 095005. http://dx.doi.org/10.1088/1361-6382/ab117c.

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Bartnik, Robert. "Bondi mass in the NQS gauge." Classical and Quantum Gravity 21, no. 3 (2003): S59—S71. http://dx.doi.org/10.1088/0264-9381/21/3/004.

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Van Acoleyen, Karel. "Lemaître–Tolman–Bondi solutions in the Newtonian gauge: from strong to weak fields." Journal of Cosmology and Astroparticle Physics 2008, no. 10 (2008): 028. http://dx.doi.org/10.1088/1475-7516/2008/10/028.

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Addazi, Andrea, and Antonino Marcianò. "Analogous BMS symmetry in QED and quantum anomaly in Dirac and Weyl semimetals." International Journal of Geometric Methods in Modern Physics 17, no. 07 (2020): 2050095. http://dx.doi.org/10.1142/s0219887820500954.

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We show that the asymptotic infinite dimensional enlarged gauge symmetries constructed for QED are anomalous in Weyl semimetals. This symmetry is particularly important in particle physics for its analogy with the Bondi–Metzner–Sachs (BMS) symmetries in gravity, as well as for its connection with QED soft IR theorems. This leads to observable effects, because of the induction of a new current in the material, which carries a memory of the BMS symmetry precursor.

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Barnich, Glenn, and Pierre-Henry Lambert. "A Note on the Newman-Unti Group and the BMS Charge Algebra in Terms of Newman-Penrose Coefficients." Advances in Mathematical Physics 2012 (2012): 1–16. http://dx.doi.org/10.1155/2012/197385.

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The symmetry algebra of asymptotically flat spacetimes at null infinity in four dimensions in the sense of Newman and Unti is revisited. As in the Bondi-Metzner-Sachs gauge, it is shown to be isomorphic to the direct sum of the abelian algebra of infinitesimal conformal rescalings with𝔟𝔪𝔰4. The latter algebra is the semidirect sum of infinitesimal supertranslations with the conformal Killing vectors of the Riemann sphere. Infinitesimal local conformal transformations can then consistently be included. We work out the local conformal properties of the relevant Newman-Penrose coefficients, const

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Lakhera, Nishant, Emmanuel Labroye, Catherine Pronga, Florence Molinie, and Samuel Lesnakowski. "Reliability of Heavy Gage Aluminum Wire-bonds under High Temperature Aging." International Symposium on Microelectronics 2016, no. 1 (2016): 000234–39. http://dx.doi.org/10.4071/isom-2016-wa54.

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Abstract Thick aluminum (Al) wedge bonds have been widely used in analog microelectronic packages due their lower cost, ease of use and excellent thermal and electrical performance. Reliability of thick Al wedge bonds on bare copper (Cu) leadframes under high temperature aging conditions has not been studied at a fundamental level in the past. This study investigates the reliability performance of Al wedge bonds on bare Cu surfaces under isothermal aging conditions specified by the automotive grade product qualification requirements. Results obtained show that Al/Cu intermetallic formed at the

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Wang, Ruimin, Janine George, Shannon Kimberly Potts, Marius Kremer, Richard Dronskowski, and Ulli Englert. "The many flavours of halogen bonds – message from experimental electron density and Raman spectroscopy." Acta Crystallographica Section C Structural Chemistry 75, no. 9 (2019): 1190–201. http://dx.doi.org/10.1107/s205322961901132x.

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Experimental electron-density studies based on high-resolution diffraction experiments allow halogen bonds between heavy halogens to be classified. The topological properties of the electron density in Cl...Cl contacts vary smoothly as a function of the interaction distance. The situation is less straightforward for halogen bonds between iodine and small electronegative nucleophiles, such as nitrogen or oxygen, where the electron density in the bond critical point does not simply increase for shorter distances. The number of successful charge–density studies involving iodine is small, but at l

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BASKARAN, G., and R. SHANKAR. "ON THE GAUGE THEORY OF THE RESONATING VALENCE BOND STATES." Modern Physics Letters B 02, no. 11n12 (1988): 1211–16. http://dx.doi.org/10.1142/s0217984988001156.

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In this brief report we review some of the basic concepts involved in the gauge theory approach to the Resonating Valence Bond State of strongly correlated electronic systems. Some general consequences of the local gauge symmetry on the nature of excitations are also discussed.

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Wijeratne, RS, R. De Vita, JA Rittenhouse, EB Orler, RB Moore, and DA Dillard. "Biaxial properties of individual bonds in thermomechanically bonded nonwoven fabrics." Textile Research Journal 89, no. 5 (2018): 698–710. http://dx.doi.org/10.1177/0040517517753640.

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Thermomechanically bonded nonwoven fabrics contain discrete bonds that are formed from melted and fused fibers. In these fabrics, the fibers are loosely organized although they lie predominantly in the machine direction (MD). Through a custom-built biaxial testing device and simultaneous image capture, the mechanical response of individual bonds in thermomechanically bonded nonwoven fabrics made of polyethylene/polypropylene sheath–core fibers was studied. Toward this end, cruciform specimens ( n = 20) with bonds in the gauge areas and arms aligned in the MD and the cross-direction (CD) were s

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Luo, Su Rong, Jin Ping Zhuang, and Yi Wang. "Experimental Study of Bond Stress Distribution between Reinforcement and Different Strength Self-Compacting Concrete Bond under Dynamic Load." Advanced Materials Research 446-449 (January 2012): 330–33. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.330.

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The bond characteristics between reinforcement and self-compacting concrete under dynamic loads was analyzed experimentally. The tests were conducted by pulling-out with setting strain gauge in reinforcment. The bond stress distribution laws were analyzed with concrete strength change.

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Dissertations / Theses on the topic "Bondi gauge"

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Ruzziconi, Romain. "On the Various Extensions of the BMS Group." Doctoral thesis, Universite Libre de Bruxelles, 2020. https://dipot.ulb.ac.be/dspace/bitstream/2013/307600/4/Contents.pdf.

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The Bondi-Metzner-Sachs-van der Burg (BMS) group is the asymptotic symmetry group of radiating asymptotically flat spacetimes. It has recently received renewed interest in the context of the flat holography and the infrared structure of gravity. In this thesis, we investigate the consequences of considering extensions of the BMS group in four dimensions with superrotations. In particular, we apply the covariant phase space methods on a class of first order gauge theories that includes the Cartan formulation of general relativity and specify this analysis to gravity in asymptotically flat space

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Gaharia, David. "Asymptotic Symmetries and Faddeev-Kulish states in QED and Gravity." Thesis, Stockholms universitet, Fysikum, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-166311.

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When calculating scattering amplitudes in gauge and gravitational theories one encounters infrared (IR) divergences associated with massless fields. These are known to be artifacts of constructing a quantum field theory starting with free fields, and the assumption that in the asymptotic limit (i.e. well before and after a scattering event) the incoming and outgoing states are non-interacting. In 1937, Bloch and Nordsieck provided a technical procedure eliminating the IR divergences in the cross-sections. However, this did not address the source of the problem: A detailed analysis reveals that

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Sabri, Amirreza. "Seismic Retrofit of Load Bearing URM Walls with Internally Placed Reinforcement and Surface-Bonded FRP Sheets." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/40675.

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Concrete block masonry is a common building material used worldwide, including Canada. Reinforced masonry buildings, designed according to the requirements of recent building codes, may result in seismically safe structures. However, unreinforced masonry (URM) buildings designed and constructed prior to the development of modern seismic design codes are extremely vulnerable to seismic induced damage. Replacement of older seismically deficient buildings with new and seismically designed structures is economically not feasible in most cases. Therefore, seismic retrofitting of deficient buildings

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Books on the topic "Bondi gauge"

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Kottman, Paul A. Self-Uncertainty as Self-Realization. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190698515.003.0005.

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A central issue in Hamlet is Hamlet’s attempt to live his life as his—his efforts at discerning a course of action that amounts to “leading” a life, rather than just suffering it. Shakespeare’s play addresses Hamlet’s difficulty in doing this, from two sides. First, Hamlet is framed by the breakdown of the social bonds on which the protagonists depend for the meaning and worth of their lives together. The play shows these bonds to be dissolvable. Second, Hamlet’s predicament does not leave us with a desperate nihilism. On the contrary, the play shows how the meaning of a life as individually l

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Book chapters on the topic "Bondi gauge"

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Cheng, Yiying. "Valuing and Analyzing Bonds with Embedded Options." In Debt Markets and Investments. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190877439.003.0025.

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This chapter introduces the analysis and valuation of bonds with embedded options. For callable bonds, it discusses their unique reinvestment risk and negative convexity. For both callable bonds and puttable bonds, the chapter introduces two additional measures to gauge their risk: yield-to-call and yield-to-put, respectively. The chapter reviews the application of the spot rate curve in bond valuation and introduces the Z-spread to measure bond-specific risk more accurately. To model interest rate risk, the chapter builds a binomial interest rate model and calibrates it with on-the-run Treasury issues. The option-adjusted-spread (OAS) is introduced to measure the bond-specific risk excluding the option effect. The difference between Z-spread and OAS represents the option effect. Common measures of convertible bond risk and value are discussed including the possibility of valuating a convertible bond using option-pricing models and its drawbacks.

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Dyall, Kenneth G., and Knut Faegri. "Molecular Properties." In Introduction to Relativistic Quantum Chemistry. Oxford University Press, 2007. http://dx.doi.org/10.1093/oso/9780195140866.003.0019.

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Strictly speaking, in quantum mechanics a measurable property is defined as an observable connected to a self-adjoint operator. However, in common usage the term molecular property is loosely taken to mean any physical attribute of a molecule, preferably amenable to experimental measurement. Common examples of properties of interest to chemists are molecular structure, thermodynamic quantities, spectroscopic transition energies and intensities, and various electric and magnetic moments. The amenability to experiment may exist only in principle—one of the strong points of modern computational chemistry is the possibility of studying phenomena occurring under conditions that lie beyond the present experimental capabilities. Sometimes, differential effects between different theoretical models are also regarded as properties: thus the correlation energy is generally considered to be the difference between the Hartree–Fock energy and the energy obtained from a complete many-electron treatment (e.g. full CI or MBPT to all orders). At best only the latter of these is accessible to experiment. Similarly, certain relativistic effects (e.g. bond contraction) only appear as the difference between results from a relativistic and a nonrelativistic calculation. The calculation of molecular properties in a relativistic framework follows the same principles as for the nonrelativistic case once a wave function or electron density of adequate quality is available. Our aim here is therefore not to provide explicit expressions and formulas for the calculation of a more or less complete catalog of properties. However, in relativistic calculations of molecular properties there are some aspects of the theory that warrant special care and consideration. In particular, we need to know how to handle features such as Lorentz invariance, gauge invariance, and negativeenergy states. Moreover, the electric and magnetic fields appear as natural parts of the relativistic Hamiltonian, and we therefore expect that properties involving these may require a different treatment from the nonrelativistic case where terms involving external fields are grafted onto the nonrelativistic Hamiltonian, often based on some reduction or approximation from the relativistic case.

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Conference papers on the topic "Bondi gauge"

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Petropoulos, Marios, Luca Ciambelli, Charles Marteau, and Romain Ruzziconi. "Fefferman--Graham and Bondi Gauges in the Fluid/Gravity Correspondence." In Corfu Summer Institute 2019 "School and Workshops on Elementary Particle Physics and Gravity". Sissa Medialab, 2020. http://dx.doi.org/10.22323/1.376.0154.

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Hempel, Jochen, Elena Zukowski, Michael Berndt, Sohaib Anees, Jürgen Wilde, and Leonhard M. Reindl. "Strain Transfer Analysis of Integrated Surface Acoustic Wave Sensors." In ASME 2013 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ipack2013-73258.

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This paper presents a strain transfer investigation for Surface Acoustic Wave (SAW) strain sensors. For evaluation, a SAW strain sensor is assembled with a pre-tested bond material for potentially high strain transfer on a test holder. The setup is stressed with an axially homogeneous strain up to 500 ppm. The strain transfer ratio is computed from the applied load, the reference measurements with foil strain gauge, and the measured SAW strain sensor signal. The strain transfer performance of the bond material is also investigated with respect to the temperature dependency in the range between

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Tsui, Y. C., J. A. Thompson, and T. W. Clyne. "The Effect of Bond Coat Creep on Residual Stresses and Debonding in Plasma Sprayed Thermal Barrier Systems." In ITSC 1998, edited by Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p1565.

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Abstract Test pieces were machined from vacuum plasma sprayed (VPS) deposits of the bond coat materials Ni-22Cr-10Al-l Y and Co-32Ni-21Cr-8Al-0.5Y. Changes in gauge length at high temperatures under various applied stresses were measured using a scanning laser extensometer. In this way, isothermal creep data and, using no applied load, expansivity data were obtained. The CoNiCrAlY creeps faster than the NiCrAlY at low stresses, but the reverse is true at high stresses. The CoNiCrAlY has an appreciably higher expansivity than the NiCrAlY. These data were used in a numerical process model to eva

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Srinivasan, G., R. Murcko, and K. Srihari. "Evaluation of Secondary Wire Bond Integrity on Ag Plated and Ni/Pd Based Lead Frame Plating Finishes." In ASME 2009 InterPACK Conference collocated with the ASME 2009 Summer Heat Transfer Conference and the ASME 2009 3rd International Conference on Energy Sustainability. ASMEDC, 2009. http://dx.doi.org/10.1115/interpack2009-89241.

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As the legislatures demand the use of lead (Pb) free plating finishes in lead frame manufacturing, different plating finishes are being offered by the lead frame makers. Lead frames are most often designed with two different Pb free plating finishes, primarily tin and nickel/palladium (Ni/Pd) based. The tin post mold plated lead frames use silver selective plating on the lead fingers for secondary wire bonding whereas the pre-plated Ni/Pd based lead frames use the same Ni/Pd based finish throughout. Enhanced versions of Ni/Pd based plating finishes such as nickel/palladium/gold (Ni/Pd/Au), nic

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Gyekenyesi, Andrew L., Sulochana Shrestha, Manigandan Kannan, Gregory Morscher, and Onome E. Scott-Emuakpor. "Characterization of an Additively Repaired Ti-6Al-4V Alloy." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91781.

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Abstract A major disadvantage regarding integrally bladed rotors (IBRs: also referred to as blisks) is the ability to repair damage. Since it is a single part, anything beyond a minor dent requires full removal and either an expensive replacement or a complicated repair. Repair approaches gaining attention include additive metal build-up techniques such as blown powder directed energy deposition (DED). As a start and to attain confidence in such repairs, the characterization of additively modified specimens is required. The work presented here involved the tensile and fatigue testing of stock,

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Gardner, Dave, Hans Joakim Skadsem, Katherine Beltrán-Jiménez, Amit Govil, Guillermo Obando Palacio, and Laurent Delabroy. "A Comparison of the Measured Properties of Annular Cement with Ultrasonic Cement Evaluation Logs." In SPE/IADC International Drilling Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/204015-ms.

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Abstract Different measurement methods have been utilized to investigate the quality of the cement sheath inside two cemented sandwich sections including high-resolution ultrasonic cement evaluation logs, analysis of samples, mechanical loading, and fluid seepage measurements. The sections were recovered from a North Sea well during a permanent plug and abandonment operation. The measurements have been analyzed with an aim to describe in detail the spatial variations in the cement properties and relate them to the logs. Ultrasonic cement evaluation logs were recorded to map the acoustic proper

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"A 3D Printed, Constriction-Resistive Sensor for the Detection of Ultrasonic Waves." In Structural Health Monitoring. Materials Research Forum LLC, 2021. http://dx.doi.org/10.21741/9781644901311-33.

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Abstract. Ultrasonic waves, either bulk waves or guided waves, are commonly used for non-destructive evaluation, for example in structural health monitoring. Traditional sensors for detecting ultrasonic waves include metallic strain gauges and piezoelectric ceramics. Recently piezoresistive nanocomposites have emerged as a promising sensor with high sensing range. In this paper, a constriction-resistive based sensor made from a graphene reinforced PLA filament is developed using a fused deposition modelling 3D printing approach as a novel type of ultrasonic sensor for structural health monitor

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Volkov, Maxim, Henric Björk, Natalia Kudriavaia, Jamie Stuart Andrews, Truls Carlsen, and Steinar Strøm. "The Value of Integrated Downhole Passive Acoustic Monitoring During an Extended Leak Off Test to Prove Formation Integrity. A Case Study." In SPE/IADC International Drilling Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/204047-ms.

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Abstract The Extended Leak Off Test (XLOT) is a sophisticated formation integrity test that can be performed during drilling, recompletion, or at the well abandonment stage. The test is usually characterized by multiple cycles, creating and manipulating a fracture that can extend several meters away from the wellbore. The test can provide more data (both formation stress and fracture mechanics) compared to traditional leak-off tests. This data is used extensively both for determination of the in-situ formation stress for well barrier integrity assessment and for more general rock mechanical wo

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Alam, Shah, and Guoqiang Li. "A Study of Hybrid Composite Sandwich Beam." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11845.

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Abstract This study presents the testing and numerical modeling results of composite sandwich beams. The sandwich beams are constructed from balsa wood in the core and high strength steel wire and E-glass fiber reinforced polymer composite in the facings. The testing of these beams is performed using a monotonic static four-point loading to failure in accordance with ASTM C393-00. Local strain distribution in the mid-span of the beams is obtained using strain gauges. Mid-span deflections of the beams are real-time measured using linear variable displacement transducer (LVDT). From the experime

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Fenton, J. W., J. I. Witting, and T. M. Miller. "THROMBIN KINETIC PARAMETERS WITH TRIPEPTIDE p-NITROANALIDES UNDER PHYSIOLOGICALLY RELEVANT CONDITIONS." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643278.

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The Michaelis-Menten (Km ), catalytic (kcat ), and specificity (kcat/Km ) constants were determined for humSft α- and β-thrombins with the chromogenic substrate S-2238 (H-D-Phe-Pip-Arg-pNA), Chromozym-TH (Tos-Gly-Pro-Arg-pNA), and Spectrozyme-TH (H-D-HHT-Ala-Arg-pNA) in 0.15 M NaCl buffered with 10 mM HEPES ancTlO mM Tris-HCT at pH 7.4, 37°C. Spontaneous hydrolysis was insignificant for these substrates. Both S-2238 and Spectrozyme-TH exhibited limiting solubilities at ∼35 μM, while Chromozym-TH did not do so up to 50 μM. From initial estimates, Km's and k t's were refined by computer Gause-Ne

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