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Littérature scientifique sur le sujet « White hole analogues »

Auteur : Grafiati

Publié le 7 juin 2025

Mis à jour le 2 août 2025

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Articles de revues sur le sujet "White hole analogues"

Unruh, W. G. "Dumb holes: analogues for black holes." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 366, no. 1877 (2008): 2905–13. http://dx.doi.org/10.1098/rsta.2008.0062.

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The use of sonic analogues to black and white holes, called dumb or deaf holes, to understand the particle production by black holes is reviewed. The results suggest that the black hole particle production is a low-frequency and low-wavenumber process.

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Howard, Eric. "Cosmology analogues in optical systems." EPJ Web of Conferences 238 (2020): 11008. http://dx.doi.org/10.1051/epjconf/202023811008.

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We discuss the possibility of exploiting polariton-exciton physics as an analogue experimental tool to study challenging ideas and existing problems arising in the context of gravity theory and theoretical cosmology. We search for cosmology analogues with specific focus on simulating non-equilibrium dynamics across cosmological phase transitions in laboratory as well as employing optical analogue horizons in Bose-Einstein condensates (BECs) and signatures of white hole radiation to study gravitational and cosmological processes. Our analysis aims to uncover conceptual similarities between cond

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Schenke, Sören, Fabian Sewerin, Berend van Wachem, and Fabian Denner. "Amplitude modulation of acoustic waves in accelerating flows quantified using acoustic black and white hole analogues." Journal of the Acoustical Society of America 154, no. 2 (2023): 781–91. http://dx.doi.org/10.1121/10.0020561.

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We investigate the amplitude modulation of acoustic waves in accelerating flows, a problem that is still not fully understood, but essential to many technical applications, ranging from medical imaging to acoustic remote sensing. The proposed modeling framework is based on a convective form of the Kuznetsov equation, which incorporates the background flow field and is solved numerically by a finite-difference method. Using acoustic black and white hole analogues as model systems, we identify a modulation of the wave amplitude which is shown to be driven by the divergence/convergence of the aco

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Denner, Fabian. "Acoustic pressure modulation driven by spatially non-uniform flow." Journal of the Acoustical Society of America 155, no. 2 (2024): 984–89. http://dx.doi.org/10.1121/10.0024751.

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The recent identification of a modulation of acoustic waves that is driven by spatial velocity gradients, using acoustic black and white hole analogues [see Schenke, Sewerin, van Wachem, and Denner, J. Acoust. Soc. Am. 154, 781–791 (2023)], has shed new light on the complex interplay of acoustic waves and non-uniform flows. According to the virtual acoustic black hole hypothesis, these findings should be applicable to acoustic waves propagating in non-uniform flows of arbitrary velocity. In this study, the propagation of acoustic waves in non-uniform flows is investigated by incorporating a le

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Tettamanti, Manuele, and Alberto Parola. "Formation Dynamics of Black- and White-Hole Horizons in an Analogue Gravity Model." Universe 6, no. 8 (2020): 105. http://dx.doi.org/10.3390/universe6080105.

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We investigate the formation dynamics of sonic horizons in a Bose gas confined in a (quasi) one-dimensional trap. This system is one of the most promising realizations of the analogue gravity paradigm and has already been successfully studied experimentally. Taking advantage of the exact solution of the one-dimensional, hard-core, Bose model (Tonks–Girardeau gas), we show that by switching on a step potential, either a sonic, black-hole-like horizon or a black/white hole pair may form, according to the initial velocity of the fluid. Our simulations never suggest the formation of an isolated wh

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Tarafdar, Pratik, and Tapas K. Das. "Influence of the geometric configuration of accretion flow on the black hole spin dependence of relativistic acoustic geometry." International Journal of Modern Physics D 27, no. 03 (2018): 1850023. http://dx.doi.org/10.1142/s0218271818500232.

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Linear perturbation of general relativistic accretion of low angular momentum hydrodynamic fluid onto a Kerr black hole leads to the formation of curved acoustic geometry embedded within the background flow. Characteristic features of such sonic geometry depend on the black hole spin. Such dependence can be probed by studying the correlation of the acoustic surface gravity [Formula: see text] with the Kerr parameter [Formula: see text]. The [Formula: see text]–[Formula: see text] relationship further gets influenced by the geometric configuration of the accretion flow structure. In this work,

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Schenke, Sören, Fabian Sewerin, Berend van Wachem, and Fabian Denner. "Simulating acoustic waves in acoustic black hole analogues." Journal of the Acoustical Society of America 151, no. 4 (2022): A226. http://dx.doi.org/10.1121/10.0011141.

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We present a physical model and a numerical method to simulate nonlinear acoustic waves emitted from moving boundaries in a moving background flow field with transition from subsonic to supersonic flow speeds. The physical model is based on a convective form of the Westervelt equation and accounts for the motion of the background medium and the progressive distortion of a finite amplitude acoustic wave. A suitable coordinate transformation in physical space allows us to accommodate the motion of the wave emitting boundary, while solving the governing equation in a fixed computational domain us

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Bhandari, Lalit S., and Arun M. Thalapillil. "Exploring millicharged dark matter components from the shadows." Journal of Cosmology and Astroparticle Physics 2022, no. 03 (2022): 043. http://dx.doi.org/10.1088/1475-7516/2022/03/043.

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Abstract Dark matter sectors with hidden interactions have been of much interest in recent years. These frameworks include models of millicharged particles as well as dark sector bound states, whose constituents have electromagnetic gauge interactions. These exotic, charged states could constitute a part of the total dark matter density. In this work, we explore in some detail the various effects, on the photon sphere and shadow of spherically symmetric black holes, due to dark matter plasmas furnished by such sectors. Estimating physically viable parameter spaces for the particle physics mode

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Bahamonde, Sebastian, Jorge Gigante Valcarcel, Laur Järv, and Joosep Lember. "Black hole solutions in scalar-tensor symmetric teleparallel gravity." Journal of Cosmology and Astroparticle Physics 2022, no. 08 (2022): 082. http://dx.doi.org/10.1088/1475-7516/2022/08/082.

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Abstract Symmetric teleparallel gravity is constructed with a nonzero nonmetricity tensor while both torsion and curvature are vanishing. In this framework, we find exact scalarised spherically symmetric static solutions in scalar-tensor theories built with a nonminimal coupling between the nonmetricity scalar and a scalar field. It turns out that the Bocharova-Bronnikov-Melnikov-Bekenstein solution has a symmetric teleparallel analogue (in addition to the recently found metric teleparallel analogue), while some other of these solutions describe scalarised black hole configurations that are no

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Zhao, Qingxiong, Linglin Xie, Ping Cao, et al. "A Study on the Borehole Wall Stability Analysis and Slurry Ratio Optimization for Construction of Pile in Complex Marine Strata." Materials 17, no. 9 (2024): 1984. http://dx.doi.org/10.3390/ma17091984.

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In order to address the issue of hole collapse, which frequently arises when boring piles are being constructed in intricate marine strata, this paper discusses the influence of the slurry ratio on the slurry performance as well as the mechanism of slurry wall protection. It performs this by means of theoretical analysis, laboratory ratio testing, engineering analogies, numerical simulation, and field testing. Our findings demonstrate that adding sodium polyacrylate and sodium carboxymethyl cellulose can enhance mud’s viscosity, contribute to flocculation, and improve the connection between mu

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Livres sur le sujet "White hole analogues"

White, Lauren Smelser. Flesh Made Word. Lexington Books, 2022. https://doi.org/10.5040/9781978719026.

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This book delineates the individualist “interpretation problem” that has long beset Protestant biblical interpretation and engages theological resources that could serve to move beyond it. Lauren Smelser White argues that readers of Scripture—specifically those who long to submit their lives to God's transforming Word, which they believe the Bible discloses—ought to reckon with the participatory role that human bodies (corporeal and corporate) play in producing revelation's norms. Such a reckoning need not entail giving up on Scripture delivering the life-changing address of a divine Other. In

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Dow, Bonnie J. Fixing the Meaning of the Movement. University of Illinois Press, 2017. http://dx.doi.org/10.5406/illinois/9780252038563.003.0005.

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This chapter focuses on the ABC documentary on the Ladies' Home Journal sit-in entitled “Women's Liberation,”, produced by reporter Marlene Sanders. The documentary is 1970's key example of a supportive reporter's self-conscious effort to represent the movement fairly. It also serves as the most developed example of network news' reliance on race–sex and feminism–civil rights analogies. In her memoir of her reporting career, Sanders makes clear that she saw the documentary as an intervention into poor media treatment of the movement, echoing the contention of many feminists that the movement's

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Williams, James. Darwin’s Theological Virtues. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198737827.003.0010.

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This chapter considers the ethical dimensions of Darwin’s style under the headings of the theological virtues: faith, hope, and charity. It argues that style, as the manner in which prose conducts itself, is analogous to virtue in something like the sense that ‘virtue ethics’ has described the term, the shape or telos of a way of life or behaviour. This approach to Darwin both sheds light on the natural and instinctual forms of his thought and permits us to grapple with a traditional problem for both evolution and literary criticism: the question of design. While no claim is made for Darwin as

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Chapitres de livres sur le sujet "White hole analogues"

Mathie, Alex. "Black Holes and Analogy." In Synthese Library. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-26618-8_14.

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AbstractIt is generally accepted that science sometimes involves reasoning with analogies. Often, this simply means that analogies between disparate objects of study might be used as heuristics to guide theory development. Contemporary black hole physics, however, deploys analogical reasoning in a way that seems to overreach this traditional heuristic role. In this chapter, I describe two distinct pieces of analogical reasoning that are quite central to the contemporary study of black holes. The first underpins arguments for the existence of astrophysical Hawking radiation, and the second unde

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Edwards, Huw M. "External Influences and Analogues: II." In Dafydd ap Gwilym. Oxford University PressOxford, 1996. http://dx.doi.org/10.1093/oso/9780198159018.003.0007.

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Abstract The cywydd to the lark discussed in the previous chapter is one of the finest illustrations of Dafydd ap Gwilym’s deep religious reverence for the natural world as God’s creation and a manifestation of God on earth. It is a feeling which pervades his nature poetry, and the view that a poem such as GDG 122 (‘Offeren y Llwyn’) is, as I for Williams suggested long ago, an irreverent parody of the established religion comparable with the outrageous burlesques of the Latin scholars cannot, I think, be justified. The phrase ‘careglnwyf a chariad’ (GDG 122.34), ‘a chalice of passion and love

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Hovorka, Roman. "Closing the loop." In Oxford Textbook of Endocrinology and Diabetes. Oxford University Press, 2011. http://dx.doi.org/10.1093/med/9780199235292.003.1455.

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The standard therapy of type 1 diabetes is based on multiple daily injections of short- and long acting-insulin analogues accompanied by blood glucose self-monitoring. However, treatment goals identified by the Diabetes Control and Complications Trial are difficult to achieve due, at least in part, to a high risk of hypoglycaemia associated with many currents forms of intensive insulin therapy. Recent technological developments in real-time subcutaneous continuous glucose monitoring (CGM), combined with the continuous subcutaneous insulin infusion (CSII), could potentially reduce this risk. Si

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Tsika, Noah. "From Kiddie Cops to the Coal Police." In Screening the Police. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780197577721.003.0007.

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In the United States, the normalization of police power has often demanded the delineation of fraudulent or otherwise illegitimate aspirants to such power. This chapter considers cinematic depictions of parapolicing. Such representations speak to ongoing anxieties surrounding the actual, discernable contours of police power in the United States. In Hollywood, the Studio Relations Committee was particularly wary of analogies between “real” police officers and their privately employed counterparts. The films examined in this chapter address the complexities of those public-private partnerships t

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Hughes, Barry D. "Critical Exponents In Percolation Theory." In Random Walks and Random Environments. Oxford University PressOxford, 1996. http://dx.doi.org/10.1093/oso/9780198537892.003.0005.

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Abstract It is believed that the behaviour of the key statistics of percolation theory close to the percolation threshold can be described in terms of ‘critical exponents’. Some of the critical exponents are defined solely in terms of the cluster-size distribution Pn(p) and functions related to it, such as the mean cluster size x(p) and the percolation probability P00(p). These are discussed for arbitrary homogeneous lattices in §4.1. A number of relations between the critical exponents defined via Pn(P) are believed to hold (§4.2). These relations are closely analogous to scaling relations in

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Kumar, Udaya. "Art, Language, and Tradition: Some Remarks On ‘Proteus’ and Joyce’s Aesthetic Theories." In The Joycean Labyrinth. Oxford University PressOxford, 1991. http://dx.doi.org/10.1093/oso/9780198112211.003.0005.

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Abstract The image of Proteus invokes an opposition between appearance and truth. One learns from the Homeric analogue that Menelaus, to learn the truth concerning his future, both worldly and other-worldly, had to capture Proteus and hold him fast while the old sea-god went through all forms of appearances. The Protean transformations, for Stephen, signify the perennial flux of the objects of perception. They constitute ‘the ineluctable modality of the visible’. It is nearing noon-time when the world of vision is most accessible and most displayful in its variety. And it is also at noon-time

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Nicklas, Tobias. "The Interaction of Canon and History." In Martyrdom. Amsterdam University Press, 2020. http://dx.doi.org/10.5117/9789462988187_ch01.

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In his chapter, Tobias Nicklas focuses on the dynamic interconnections between what became the early Christian canon of the Holy Writings of the Bible and the identities resulting from the history of various Christian groups. The development of the canon was decisive for the beliefs of the Christians and their identity, but changes in the group identities led to changes of perspectives on the canon in various contexts. Thus, the ‘canonical process’ did not come to its end with the discontinuity of the closure especially of the canon. As a matter of fact, other writings that do not claim to be

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Kayacik, H. Gunes. "Current Challenges in Intrusion Detection Systems." In Encyclopedia of Multimedia Technology and Networking, Second Edition. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-60566-014-1.ch042.

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Along with its numerous benefits, the Internet also created numerous ways to compromise the security and stability of the systems connected to it. In 1995, 171 vulnerabilities were reported to CERT/CC © while in 2003, there were 3,784 reported vulnerabilities, increasing to 8,064 in 2006 (CERT/CC©, 2006). Operations, which are primarily designed to protect the availability, confidentiality, and integrity of critical network information systems are considered to be within the scope of security management. Security management operations protect computer networks against denial-of-service attacks

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Badler, Norman I., Cary B. Phillips, and Bonnie Lynn Webber. "Introduction and Historical Background." In Simulating Humans. Oxford University Press, 1993. http://dx.doi.org/10.1093/oso/9780195073591.003.0004.

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People are all around us. They inhabit our home, workplace, entertainment, and environment. Their presence and actions are noted or ignored, enjoyed or disdained, analyzed or prescribed. The very ubiquitousness of other people in our lives poses a tantalizing challenge to the computational modeler: people are at once the most common object of interest and yet the most structurally complex. Their everyday movements are amazingly fluid yet demanding to reproduce, with actions driven not just mechanically by muscles and bones but also cognitively by beliefs and intentions. Our motor systems manag

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Smith, Gary. "Patterns in Randomness." In The AI Delusion. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198824305.003.0007.

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I do an extra-sensory perception (ESP) experiment on the first day of my statistics classes. I show the students an ordinary coin— sometimes borrowed from a student—and flip the coin ten times. After each flip, I think about the outcome intently while the students try to read my mind. They write their guesses down, and I record the actual flips by circling H or T on a piece of paper that has been designed so that the students cannot tell from the location of my pencil which letter I am circling. Anyone who guesses all ten flips correctly wins a one-pound box of chocolates from a local gourmet

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Actes de conférences sur le sujet "White hole analogues"

Vakili, V., and L. H. Shu. "Towards Biomimetic Concept Generation." In ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/dtm-21715.

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Abstract This paper describes efforts towards generalizing biomimetic concept generation in engineering design. Biomimetic design fully or partially imitates or evokes some biological phenomenon. Nature has often inspired solutions to engineering problems. While biological phenomena hold a vast amount of ideas, a method for finding and using these ideas would make biomimetic innovation faster, easier and more accessible. The paper begins with a brief review of related research, recognition of engineering ideas in biological phenomena and advantages of the natural brand. Next presented are stra

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Lajim Sayung, Colinus, Norashikin Hamza, Zurita Johar, M. Kamal Sahrudin, and Aizuddin Khalid. "First Marginal Deepwater Field Development: Maximizing Learnings and Probability of Success (POS) for Downhole Sand Control." In SPE Asia Pacific Oil & Gas Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210608-ms.

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Abstract The company has extensive experience in holistic sand control and solid management for shallow water environment. Application to near-future marginal deepwater project called L-B cluster requires higher considerations on subsea umbilical, risers, and flowlines (SURF) integrity and long term well performance due to the high-cost environment. Representative field samples (e.g., cores, drill stem test (DST data) to study rock mechanics is scarce with limited in-situ stresses calibration information. This paper presents the workflow undertaken by team to de-risk and establish the downhole

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Harris, Hannah, Adia Radecka, Raefa Malik, et al. "Development and Characterization of Biostable Hydrogel Robotic Actuators for Implantable Devices: Tendon Actuated Gelatin." In 2022 Design of Medical Devices Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/dmd2022-1049.

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Abstract While the field of medical device design has made tremendous progress in recent decades, implantable devices continue to be plagued by the body’s immune response and fibrosis. The field of soft robotics uses low modulus materials that compliance match surrounding tissues to help address this issue. Traditionally, silicone has been the material of choice for soft robots. Although durable and elastic, implanted silicone often leads to fibrosis. To advance the use of soft robotics in medical devices, new materials must be explored. We hypothesize that protein-based soft robotic actuators

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Avdiukhin, Dmitrii, and Grigory Yaroslavtsev. "HOUDINI: Escaping from Moderately Constrained Saddles." In Thirty-Second International Joint Conference on Artificial Intelligence {IJCAI-23}. International Joint Conferences on Artificial Intelligence Organization, 2023. http://dx.doi.org/10.24963/ijcai.2023/383.

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We give polynomial time algorithms for escaping from high-dimensional saddle points under a moderate number of constraints. Given gradient access to a smooth function, we show that (noisy) gradient descent methods can escape from saddle points under a logarithmic number of inequality constraints. While analogous results exist for unconstrained and equality-constrained problems, we make progress on the major open question of convergence to second-order stationary points in the case of inequality constraints, without reliance on NP-oracles or altering the definitions to only account for certain

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Karpov, Dmitry, and Vasily Konovalov. "Knowledge Transfer Between Tasks and Languages in the Multi-task Encoder-agnostic Transformer-based Models." In INTERNATIONAL CONFERENCE on Computational Linguistics and Intellectual Technologies. RSUH, 2023. http://dx.doi.org/10.28995/2075-7182-2023-22-200-214.

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We explore the knowledge transfer in the simple multi-task encoder-agnostic transformer-based models on five dialog tasks: emotion classification, sentiment classification, toxicity classification, intent classification, and topic classification. We show that these mo dels’ accuracy differs from the analogous single-task models by ∼0.9%. These results hold for the multiple transformer backbones. At the same time, these models have the same backbone for all tasks, which allows them to have about 0.1% more parameters than any analogous single-task model and to support multiple tasks simultaneous

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Cuadros, Guillermo Marcelo, Ana Patricia Cavalcanti de Castro Laier, Antonio Persio Silvestre, et al. "High-Definition Acoustic and Resistivity Imaging-While-Drilling Technologies: Experiences in the Brazilian Presalt Carbonate Reservoirs." In 2024 SPWLA 65th Annual Symposium. Society of Petrophysicists and Well Log Analysts, 2024. https://doi.org/10.30632/spwla-2024-0067.

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Characterizing geological features and artifacts of interest for geological, geomechanical, and petrophysical analysis is vital in the presalt reservoirs. For years, a significant technology gap between wireline and LWD systems has centered around borehole imaging resolution. The lack of high-definition borehole imagers has deterred companies operating offshore in Brazil from transitioning to full LWD acquisition. Nevertheless, the utilization of the new imaging systems outlined in this study effectively bridges this technological gap. The aim of this study is to share our experience with the

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El Hajj, Hicham, Uchenna Odi, and Anuj Gupta. "Study of Use of Supercritical CO2 to Enhance Gas Recovery and its Interaction With Carbonate Reservoirs." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-11253.

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It is well known that with continued production from wet gas reservoirs, the reservoir pressure eventually falls below the dew point pressure leading to condensation and loss of gas productivity in the reservoir. The concept of simultaneously injecting CO2 in a gas reservoir for long term storage while at the same time accelerating production of the natural gas is intriguing and promising. CO2 may also interact with carbonate matrix by changing porosity and permeability of the host rock; this is true for reservoirs that are found in the Gulf Region. To maintain field gas production targets, op

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Alahmad, M., and P. Bonte. "Pressurized Mud Cap Drilling and Logging in Deepwater Carbonate Reservoir - A Case History." In SPE/IADC Asia Pacific Drilling Technology Conference and Exhibition. SPE, 2024. http://dx.doi.org/10.2118/219588-ms.

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Abstract Over time, Managed Pressure Drilling (MPD) and Pressurized Mud Cap Drilling (PMCD) techniques have gained acceptance and success in deepwater drilling, providing access to reservoirs that were previously difficult to reach. However, despite the documented successes in various publications, the level of complexity persists in the deepwater environment, accompanied by inherent risks. This paper discusses the challenges faced and key insights gained from drilling two deepwater exploration wells off the coast of Sabah, Malaysia. Drilling carbonate reservoirs in deepwater is well known to

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Burberi, E., D. Massini, L. Cocchi, L. Mazzei, A. Andreini, and B. Facchini. "Effect of Rotation on a Gas Turbine Blade Internal Cooling System: Numerical Investigation." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-57178.

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Increasing turbine inlet temperature is one of the main strategies used to accomplish the demands of increased performance of modern gas turbines. As a consequence, optimization of the cooling system is of paramount importance in gas turbine development. Leading edge represents a critical part of cooled nozzles and blades, given the presence of the hot gases stagnation point and the unfavourable geometry for cooling. This paper reports the results of a numerical investigation aimed at assessing the rotation effects on the heat transfer distribution in a realistic leading edge internal cooling

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Xia, Xiaoyang, Eric Nelson, Dan Olds, Larry Connor, and He Zhang. "An Integrated Workflow for Reserves Evaluation in the U.S. Permian Basin Based on SPEE Monograph 3." In SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/206362-ms.

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Abstract In 2011, the Society of Petroleum Evaluation Engineers (SPEE) published Monograph 3 as an industry guideline for reserves evaluation of unconventionals, especially for probabilistic approaches. This paper illustrates the workflow recommended by Monograph 3. The authors also point out some dilemmas one may encounter when applying the guidelines. Finally, the authors suggest remedies to mitigate limitations and improve the utility of the approach. This case study includes about 300 producing shale wells in the Permian Basin. Referring to Monograph 3, analogous wells were identified base

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