Log in

Relevant bibliographies by topics / Collapsar

Contents

Journal articles
Dissertations / Theses
Books
Book chapters
Conference papers
Reports

Academic literature on the topic 'Collapsar'

Author: Grafiati

Published: 4 June 2021

Last updated: 20 June 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Collapsar.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Collapsar"

1

Wei, Yun-Feng, and Tong Liu. "Black Hole Hyperaccretion in Collapsars: A Review." Universe 8, no. 10 (2022): 529. http://dx.doi.org/10.3390/universe8100529.

Full text

Abstract:

The collapsar model is widely accepted as one of the standard scenarios for gamma-ray bursts (GRBs). In the massive collapsar scenario, the core will collapse to a black hole (BH) surrounded by a temporary hyperaccretion disk with a very high accretion rate. The newborn BH hyperaccretion system would launch the relativistic jets via neutrino annihilation and Blandford-Znajek (BZ) mechanism. At the initial accretion stage, the accretion disk should be a neutrino-dominated accretion flow (NDAF). If the jets can break out from the envelope and circumstellar medium, then a GRB will be triggered. In this review, we summarize the theoretical progress on the multimessenger astronomy of the BH hyperaccretion in the center of collapsars. The main topics include: jet propagation in collapsar, MeV neutrinos from NDAFs and proto-neutron stars, gravitational waves from collapsars.

APA, Harvard, Vancouver, ISO, and other styles

2

Barnes, Jennifer, and Brian D. Metzger. "A Collapsar Origin for GRB 211211A Is (Just Barely) Possible." Astrophysical Journal 947, no. 2 (2023): 55. http://dx.doi.org/10.3847/1538-4357/acc384.

Full text

Abstract:

Abstract Gamma-ray bursts (GRBs) have historically been divided into two classes. Short-duration GRBs are associated with binary neutron star mergers (NSMs), while long-duration bursts are connected to a subset of core-collapse supernovae (SNe). GRB 211211A recently made headlines as the first long-duration burst purportedly generated by an NSM. The evidence for an NSM origin was excess optical and near-infrared emission consistent with the kilonova observed after the gravitational-wave-detected NSM GW170817. Kilonovae derive their unique electromagnetic signatures from the properties of the heavy elements synthesized by rapid neutron capture (the r-process) following the merger. Recent simulations suggest that the “collapsar” SNe that trigger long GRBs may also produce r-process elements. While observations of GRB 211211A and its afterglow rule out an SN typical of those that follow long GRBs, an unusual collapsar could explain both the duration of GRB 211211A and the r-process-powered excess in its afterglow. We use semianalytic radiation transport modeling to evaluate low-mass collapsars as the progenitors of GRB 211211A–like events. We compare a suite of collapsar models to the afterglow-subtracted emission that followed GRB 211211A, and find the best agreement for models with high kinetic energies and an unexpected pattern of 56Ni enrichment. We discuss how core-collapse explosions could produce such ejecta, and how distinct our predictions are from those generated by more straightforward kilonova models. We also show that radio observations can distinguish between kilonovae and the more massive collapsar ejecta we consider here.

APA, Harvard, Vancouver, ISO, and other styles

3

Wei, Yun-Feng, and Tong Liu. "Black Hole Hyperaccretion in Collapsars. III. GRB Timescale." Astrophysical Journal 936, no. 2 (2022): 182. http://dx.doi.org/10.3847/1538-4357/ac8bd1.

Full text

Abstract:

Abstract Gamma-ray bursts (GRBs) are classified into long and short populations (i.e., LGRBs and SGRBs) based on the observed bimodal distribution of duration T 90. Multimessenger observations indicate that most SGRBs and LGRBs should be powered by ultrarelativistic jets launched from black hole (BH) hyperaccretion in compact-object mergers and massive collapsars, respectively. However, the duration criterion sometimes cannot correctly reflect the physical origin of a particular GRB. In the collapsar scenario, a GRB can be observed when the jet breaks out from the envelope and circumstellar medium successfully. The observed GRB duration reflects only the time the engine operates after the jet breaks out. This work studies the propagation of jets driven by the neutrino annihilation or Blandford–Znajek mechanism in massive collapsars. The signatures of the progenitors producing LGRBs, SGRBs, and failed GRBs in the collapsar scenario are exhibited. The competition between the mass supply onto the BH hyperaccretion and jet propagation into the envelope is definitely dependent on the density profiles of the collapsars. We show that duration and isotropic energy E γ,iso of GRBs can help constrain the density profiles of collapsars. Finally, we propose that a collapsar-origin SGRB, GRB 200826A, might originate from a neutrino-annihilation-dominated jet launched by a ~10 M ⊙ collapsar whose progenitor’s envelope has been stripped.

APA, Harvard, Vancouver, ISO, and other styles

4

Piran, Tsvi, Omer Bromberg, Ehud Nakar, and Re’em Sari. "The long, the short and the weak: the origin of gamma-ray bursts." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 371, no. 1992 (2013): 20120273. http://dx.doi.org/10.1098/rsta.2012.0273.

Full text

Abstract:

The origin of gamma-ray bursts (GRBs) is one of the most interesting puzzles in recent astronomy. During the last decade a consensus has formed that long GRBs (LGRBs) arise from the collapse of massive stars, and that short GRBs (SGRBs) have a different origin, most likely neutron star mergers. A key ingredient of the collapsar model that explains how the collapse of massive stars produces a GRB is the emergence of a relativistic jet that penetrates the stellar envelope. The condition that the emerging jet penetrates the envelope imposes strong constraints on the system. Using these constraints we show the following. (i) Low-luminosity GRBs ( ll GRBs), a subpopulation of GRBs with very low luminosities (and other peculiar properties: single-peaked, smooth and soft), cannot be formed by collapsars. ll GRBs must have a different origin (most likely a shock breakout). (ii) On the other hand, regular LGRBs must be formed by collapsars. (iii) While for BATSE the dividing line between collapsars and non-collapsars is indeed at approximately 2 s, the dividing line is different for other GRB detectors. In particular, most Swift bursts longer than 0.8 s are of a collapsar origin. This last result requires a revision of many conclusions concerning the origin of Swift SGRBs, which were based on the commonly used 2 s limit.

APA, Harvard, Vancouver, ISO, and other styles

5

Siegel, Daniel M., Aman Agarwal, Jennifer Barnes, Brian D. Metzger, Mathieu Renzo, and V. Ashley Villar. "“Super-kilonovae” from Massive Collapsars as Signatures of Black Hole Birth in the Pair-instability Mass Gap." Astrophysical Journal 941, no. 1 (2022): 100. http://dx.doi.org/10.3847/1538-4357/ac8d04.

Full text

Abstract:

Abstract The core collapse of rapidly rotating massive ∼ 10M ⊙ stars (“collapsars”), and the resulting formation of hyperaccreting black holes, comprise a leading model for the central engines of long-duration gamma-ray bursts (GRBs) and promising sources of r-process nucleosynthesis. Here, we explore the signatures of collapsars from progenitors with helium cores ≳ 130M ⊙ above the pair-instability mass gap. While the rapid collapse to a black hole likely precludes prompt explosions in these systems, we demonstrate that disk outflows can generate a large quantity (up to ≳ 50M ⊙) of ejecta, comprised of ≳ 5–10M ⊙ in r-process elements and ∼ 0.1–1M ⊙ of 56Ni, expanding at velocities ∼0.1 c. Radioactive heating of the disk wind ejecta powers an optical/IR transient, with a characteristic luminosity ∼ 1042 erg s−1 and a spectral peak in the near-IR (due to the high optical/UV opacities of lanthanide elements), similar to kilonovae from neutron star mergers, but with longer durations ≳1 month. These “super-kilonovae” (superKNe) herald the birth of massive black holes ≳ 60M ⊙, which—as a result of disk wind mass loss—can populate the pair-instability mass gap “from above,” and could potentially create the binary components of GW190521. SuperKNe could be discovered via wide-field surveys, such as those planned with the Roman Space Telescope, or via late-time IR follow-up observations of extremely energetic GRBs. Multiband gravitational waves of ∼ 0.1–50 Hz from nonaxisymmetric instabilities in self-gravitating massive collapsar disks are potentially detectable by proposed observatories out to hundreds of Mpc; in contrast to the “chirp” from binary mergers, the collapsar gravitational-wave signal decreases in frequency as the disk radius grows (“sad trombone”).

APA, Harvard, Vancouver, ISO, and other styles

6

Lee, K. H., I. Bartos, A. Eddins, et al. "Radio Constraints on r-process Nucleosynthesis by Collapsars." Astrophysical Journal Letters 934, no. 1 (2022): L5. http://dx.doi.org/10.3847/2041-8213/ac7ff0.

Full text

Abstract:

Abstract The heaviest elements in the universe are synthesized through rapid neutron capture (r-process) in extremely neutron-rich outflows. Neutron star mergers were established as an important r-process source through the multimessenger observation of GW170817. Collapsars were also proposed as a potentially major source of heavy elements; however, this is difficult to probe through optical observations due to contamination by other emission mechanisms. Here we present observational constraints on r-process nucleosynthesis by collapsars based on radio follow-up observations of nearby long gamma-ray bursts (GRBs). We make the hypothesis that late-time radio emission arises from the collapsar wind ejecta responsible for forging r-process elements, and consider the constraints that can be set on this scenario using radio observations of a sample of Swift/Burst Alert Telescope GRBs located within 2 Gpc. No radio counterpart was identified in excess of the radio afterglow of the GRBs in our sample. This gives the strictest limit to the collapsar r-process contribution of ≲0.2 M ⊙ for GRB 060505 and GRB 05826, under the models we considered. Our results additionally constrain energy injection by a long-lived neutron star remnant in some of the considered GRBs. While our results are in tension with collapsars being the majority of r-process production sites, the ejecta mass and velocity profile of collapsar winds, and the emission parameters, are not yet well modeled. As such, our results are currently subject to large uncertainties, but further theoretical work could greatly improve them.

APA, Harvard, Vancouver, ISO, and other styles

7

He, Zhenyu, Toshitaka Kajino, Motohiko Kusakabe, et al. "Possibility of Secondary i- and s-processes Following r-process in the Collapsar Jet." Astrophysical Journal Letters 966, no. 2 (2024): L37. http://dx.doi.org/10.3847/2041-8213/ad444c.

Full text

Abstract:

Abstract The slow and intermediate neutron-capture processes, s- and i-processes, are believed to occur in asymptotic giant branch stars to provide half of the heavy atomic nuclei with A ≥ 90. We suggest a possibility that certain types of outflows found in the collapsar, which is a supernova generated by a rapidly rotating massive star undergoing core collapse, leaving behind a black hole and emitting relativistic jets, can provide conditions that are viable for s- and i-processes as secondary processes following the rapid neutron-capture process, r-process. We propose that the pronounced odd–even effect in the mass abundance pattern near rare earth elements in metal-deficient halo stars could be an observational hint for the s- and i-processes in the collapsar.

APA, Harvard, Vancouver, ISO, and other styles

8

Gottlieb, Ore, Jonatan Jacquemin-Ide, Beverly Lowell, Alexander Tchekhovskoy, and Enrico Ramirez-Ruiz. "Collapsar Black Holes Are Likely Born Slowly Spinning." Astrophysical Journal Letters 952, no. 2 (2023): L32. http://dx.doi.org/10.3847/2041-8213/ace779.

Full text

Abstract:

Abstract Collapsing stars constitute the main black hole (BH) formation channel, and are occasionally associated with the launch of relativistic jets that power γ-ray bursts (GRBs). Thus, collapsars offer an opportunity to infer the natal (before spin-up/down by accretion) BH spin directly from observations. We show that once the BH saturates with a large-scale magnetic flux, the jet power is dictated by the BH spin and mass accretion rate. Core-collapse simulations by Halevi et al. and GRB observations favor stellar density profiles that yield an accretion rate of m ̇ ≈ 10 − 2 M ⊙ s − 1 , weakly dependent on time. This leaves the spin as the main factor that governs the jet power. By comparing the jet power to characteristic GRB luminosities, we find that the majority of BHs associated with jets are likely born slowly spinning with a dimensionless spin of a ≃ 0.2, or a ≃ 0.5 for wobbling jets, with the main uncertainty originating in the unknown γ-ray radiative efficiency. This result could be applied to the entire core-collapse BH population, unless an anticorrelation between the stellar magnetic field and angular momentum is present. In a companion paper, Jacquemin-Ide et al., we show that regardless of the natal spin, the extraction of BH rotational energy leads to spin-down to a ≲ 0.2, consistent with gravitational-wave observations. We verify our results by performing the first 3D general-relativistic magnetohydrodynamic simulations of collapsar jets with characteristic GRB energies, powered by slowly spinning BHs. We find that jets of typical GRB power struggle to escape from the star, providing the first numerical indication that many jets fail to generate a GRB.

APA, Harvard, Vancouver, ISO, and other styles

9

Yamazaki, Yuta, Zhenyu He, Toshitaka Kajino, et al. "Possibility to Identify the Contributions from Collapsars, Supernovae, and Neutron Star Mergers from the Evolution of the r-process Mass Abundance Distribution." Astrophysical Journal 933, no. 1 (2022): 112. http://dx.doi.org/10.3847/1538-4357/ac721c.

Full text

Abstract:

Abstract We study the evolution of rapid neutron-capture process (r-process) isotopes in the galaxy. We analyze relative contributions from core-collapse supernovae (CCSNe), neutron star mergers, and collapsars under a range of astrophysical conditions and nuclear input data. Here we show that, although the r-process in each of these sites can lead to a similar (universal) elemental distribution, the detailed isotopic abundances can differ from one site to another. These differences may allow for the identification of which sources contributed to the early evolution of r-process material in the galaxy. Our simulations suggest that the early evolution was dominated by CCSNe and collapsar r-process nucleosynthesis. This conclusion may be testable if the next generation of observatories can deduce isotopic r-process abundances.

APA, Harvard, Vancouver, ISO, and other styles

10

Masada, Youhei. "Dead zone formation and non-steady hyperaccretion in collapsar disks." Proceedings of the International Astronomical Union 4, S259 (2008): 119–20. http://dx.doi.org/10.1017/s1743921309030269.

Full text

Abstract:

AbstractIn ultra dense and hot region realized in stellar core-collapse, neutrino takes major role in energy and momentum transports. We investigate the growth of magnetorotational instability (MRI) in neutrino viscous matter by using linear theory. It is found from the local linear analysis that the neutrino viscosity can suppress the MRI in the regime of weak magnetic field (B ≪ 1014G). This suggest that MHD turbulence sustained by the MRI might not be driven efficiently in the neutrino viscous media. Applying this result to collapsar disk, which is known as the central engine of gamma-ray burst (GRB), we find that the MRI can be suppressed only in its inner region. Based on this finding, a new evolutionary scenario of collapsar disk, “Episodic Disk Accretion Model” are proposed.

APA, Harvard, Vancouver, ISO, and other styles

More sources

Dissertations / Theses on the topic "Collapsar"

1

Hayakawa, Tomoyasu. "Black-Hole forming Supernovae." Kyoto University, 2020. http://hdl.handle.net/2433/253091.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Feuer, Mia. "Collapse." VCU Scholars Compass, 2009. http://scholarscompass.vcu.edu/etd/1820.

Full text

Abstract:

Through large sculptural works that are often caricatures of representational objects, my work explores the complicated moments and tangled histories of childhood Jewish schooling in Winnipeg and travels to Israel and Palestine as an adult. My thesis exhibition Collapse, as well as most of my graduate work, examines my investigation through manmade constructions that control and restrict or unite and connect the movement of others. Sculptures about a destroyed bridge’s imagined longing for exotic places, a giant onion serving as a resuscitation mechanism against tear gas or a construction crane to Armageddon are some examples of work that explore the poetry I find in dichotomies, and serve as a series of recollections that negotiate experiences beyond full understanding.

APA, Harvard, Vancouver, ISO, and other styles

3

Normann, Andrew J. "Twice Collapsed." Bowling Green State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1428515708.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Constan, Lea. "On Collapse." Thesis, Konstfack, Textil, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:konstfack:diva-7802.

Full text

Abstract:

This project is an active exploration of subjectivities through the medium of weaving. In a narrative illustrated with woven works, the emotional trajectory of this person of mixed cultural background through Swedish society is described. First, the work is contextualized in terms of the larger politico-cultural-discursive context, entitled the outside. It is then positioned in terms of the individual context, the inside, largely dramatized as the developments in the art of western tapestry in the past century. This culminates in the final works, three of which are presented in the final exhibition. They are entitled monads, the etymology of which, in Greek, relates to the words one, alone, or singularity. Each is a conceptual microcosm proposing a different light distribution scheme. They are imprints of alternative actualizing tendencies. There could only be one; at the end of the experiment, Schrodinger’s cat is either dead or alive. The collapse involves the very structure of the ground, and is therefore embedded directly into the weave structure. But remember, each act of observation is an irreversible disturbance to the system. In the interpretation of the primary emanation arises difference, but in which direction will the pendulum swing, and on what forces does its motion hinge? Do subjectivities follow the locality assumption? Do you produce subjectivities or do they produce you?

APA, Harvard, Vancouver, ISO, and other styles

5

Croudace, Katherine Margaret. "Relativistic cosmological collapse." Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627524.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Hoyte, Catherine, and n/a. "An Australian Mirage." Griffith University. School of Arts, Media and Culture, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20040719.103628.

Full text

Abstract:

This thesis contains a detailed academic analysis of the complete rise and fall of Christopher Skase and his Qintex group mirage. It uses David Harvey's 'Condition of Postmodernity' to locate the collapse within the Australian political economic context of the period (1974-1989). It does so in order to answer questions about why and how the mirage developed, why and how it failed, and why Skase became the scapegoat for the Australian corporate excesses of the 1980s. I take a multi-disciplinary approach and consider corporate collapse, corporate regulation and the role of accounting, and corporate deviance.

APA, Harvard, Vancouver, ISO, and other styles

7

Hoyte, Catherine. "An Australian Mirage." Thesis, Griffith University, 2004. http://hdl.handle.net/10072/367545.

Full text

Abstract:

This thesis contains a detailed academic analysis of the complete rise and fall of Christopher Skase and his Qintex group mirage. It uses David Harvey's 'Condition of Postmodernity' to locate the collapse within the Australian political economic context of the period (1974-1989). It does so in order to answer questions about why and how the mirage developed, why and how it failed, and why Skase became the scapegoat for the Australian corporate excesses of the 1980s. I take a multi-disciplinary approach and consider corporate collapse, corporate regulation and the role of accounting, and corporate deviance.<br>Thesis (PhD Doctorate)<br>Doctor of Philosophy (PhD)<br>School of Arts, Media and Culture<br>Full Text

APA, Harvard, Vancouver, ISO, and other styles

8

Huber, Sacha. "Economic Theories of Collapse." St. Gallen, 2008. http://www.biblio.unisg.ch/org/biblio/edoc.nsf/wwwDisplayIdentifier/06612162001/$FILE/06612162001.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Ochsendorf, John Allen. "Collapse of masonry structures." Thesis, University of Cambridge, 2002. https://www.repository.cam.ac.uk/handle/1810/244820.

Full text

Abstract:

This dissertation examines the collapse of masonry structures in response to large support displacements and horizontal ground accelerations. There are two main classes of masonry structure: arches that thrust, and supporting elements, such as walls and buttresses, which resist the thrust. This dissertation analyses the safety of arches and buttresses and identifies the resulting collapse mechanisms due to support displacements or horizontal accelerations. In particular, this research investigates the stability of a masonry arch supported on buttresses and the conditions necessary for collapse to occur. Engineers are frequently asked to determine the safety of masonry structures that have been severely distorted over the years, often due to subsidence or other long-term movements in the foundations, and this dissertation provides guidance in the assessment of such structures. The resistance of masonry buttresses to high-level horizontal loads is examined. In the case of failure due to overturning, a fracture will develop in the masonry, significantly reducing the resistance of the buttress. The capacity is further reduced by outward leaning of the buttresses, a common source of distress for masonry structures due to movements in the supporting foundations. Based on these considerations, new measures of safety are proposed for buttresses under horizontal loading. Outward leaning of the buttresses increases the span of the arch or vault. Spreading supports will cause large deformations in the arch, which increase the horizontal thrust of the arch and may lead to collapse. In addition, lateral ground accelerations can cause the collapse of arches. The influence of seismic action can be approximated to first order by equivalent static analysis to determine the initial collapse mechanism. These problems are analysed for circular masonry arches, and the collapse conditions are identified for various geometries. The findings are combined to investigate the stability of the masonry arch supported on buttresses. The safety of the system is examined by studying the influence of imposed displacements. As the buttresses lean, the thrust of the vault increases and the resistance of the buttress decreases. The collapse mechanisms are identified for both the static case of leaning buttresses and the dynamic case of horizontal acceleration. This analysis illustrates that the arch will collapse and the buttresses will remain standing in most cases. Based on these considerations, new methods are proposed for assessing the safety of masonry structures and determining the influence of future movements on the stability of existing masonry structures.

APA, Harvard, Vancouver, ISO, and other styles

10

Tziannaros, M. "Modelling bladder-collapse flow." Thesis, University College London (University of London), 2011. http://discovery.ucl.ac.uk/1317813/.

Full text

Abstract:

The thesis is concerned with the modelling of urinary motion during bladder collapse and is mathematically based. The bladder model as a collapsing vessel is developed as a step towards complementing use of nomograms. Urine motion inside is taken as unsteady flow of incompressible fluid, while the dimensions and collapse rate of the vessel are prescribed using data which is close to realistic biological values. Evolutions of velocities, volume ow rates and effects of the collapse rate are examined. An introduction is made which includes lower urinary tract urodynamics as well as the unique feature that the bladder changes shape and size substantially compared with other vessels. An investigation of simple two-dimensional shapes takes place in chapter two, along with limiting cases for thin vessels. Chapter three analyses simple axisymmetric shapes especially the sphere because of its relevance in addition to its fundamental nature. Development of a numerical scheme is addressed in the next chapter to tackle more complex shapes through the boundary element method and an iterative finite difference scheme with emphasis on flexibility of approach. An extension to more advanced structures of the vessel is constructed in chapter five by means of a concise boundary condition and shape definition. Chapter six takes the work a step further as the approach is applied to axisymmetric configurations. While in an appendix, an extension to implement full viscous effects is then inspected. Finally, further work is discussed in the conclusion.

APA, Harvard, Vancouver, ISO, and other styles

More sources

Books on the topic "Collapsar"

1

Schlichter, Kurt. Collapse. Kurt Schlichter, 2019.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

2

Diamond, Jared M. Collapse. Penguin Group USA, Inc., 2008.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

3

Drost, Alexander, Olga Sasunkevich, Joachim Schiedermair, and Barbara Törnquist-Plewa, eds. Collapse of Memory - Memory of Collapse. Böhlau Verlag, 2019. http://dx.doi.org/10.7788/9783412513702.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

McAnany, Patricia A., and Norman Yoffee, eds. Questioning Collapse. Cambridge University Press, 2009. http://dx.doi.org/10.1017/cbo9780511757815.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Fryer, Chris L., ed. Stellar Collapse. Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-0-306-48599-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Hunjan, P. S. Progressive collapse. North East London Polytechnic, 1986.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

7

Weatherill, Rob. Cultural collapse. Free Association Books, 1994.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

8

L, Fryer Chris, ed. Stellar collapse. Kluwer Academic Publishers, 2004.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

9

Joshi, Pankaj S. Gravitational collapse and spacetime singularities. Cambridge University Press, 2007.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

10

Joshi, Pankaj S. Gravitational collapse and spacetime singularities. Cambridge University Press, 2007.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

More sources

Book chapters on the topic "Collapsar"

1

de Brye, Nicolas, Pablo Cerdá-Durán, Miguel Ángel Aloy, and José Antonio Font. "General Relativistic Simulations of the Collapsar Scenario." In Progress in Mathematical Relativity, Gravitation and Cosmology. Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-40157-2_30.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Zhang, Weiqun, and Chris L. Fryer. "The Collapsar Engine for GRBS and Hypernovae." In Astrophysics and Space Science Library. Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-0-306-48599-2_11.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Liu, Xiaolin, Shuhao Li, Yongzheng Zhang, Xiaochun Yun, and Jia Li. "Challenge Collapsar (CC) Attack Traffic Detection Based on Packet Field Differentiated Preprocessing and Deep Neural Network." In Lecture Notes in Computer Science. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-50420-5_21.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Jia, Menghao, Fanyi Zhang, Xinyi Lyu, Yuncheng Wen, and Hua Xu. "Three-Dimensional Hydrodynamic Analysis and Early Warning of Ω-Collapse in the Lower Reaches of the Yangtze River Based on Experimental Study on Generalized Model." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-6138-0_140.

Full text

Abstract:

AbstractUnder the background of the construction of cascade reservoir group in the main stream of the Yangtze River, the lower reaches of the Yangtze River are faced with new water and sediment situation, which leads to the increased risk of bank collapse in the lower reaches of the Yangtze River. Therefore, the purpose of this study is to have a certain supporting significance for the prevention and control of riverbank collapse disasters. The study takes the Jiangsu section of the lower reaches of the Yangtze River as the research object. Firstly, according to the measured data over the years, the macroscopic characteristics of the collapsed bank in the Jiangsu section are analyzed, and the temporal and spatial distribution characteristics are mainly analyzed. The research results show that the collapse of the Jiangsu section of the Yangtze River is dominated by Ω-collapse, which mostly occurs in the flood season and the post-flood receding water period. The frequency of bank collapse in the Yangzhong Reach is relatively the highest among all river segments, and there are more bank collapses on the north bank than the south bank. According to statistics, the average collapse width of the collapse in the Jiangsu section can reach 130 m, the depth of the collapse can reach 60 m, and the ratio of the average bank collapse to the depth can reach 2.15. Then, aiming at the characteristics of the main bank collapse type in the Jiangsu section is the Ω-collapse, the experimental investigation and numerical calculation are used to conduct in-depth research, combined with the measured data, probability and statistical analysis and theoretical analysis. Three-dimensional hydrodynamic analysis is carried out on the mainstream area near the collapse area and outside the collapse area, focusing on the analysis of its nearshore velocity and shear stress and other factors. Combined with the water tank test, the water flow in the inner surface, middle and bottom layers of the Ω-type nest was studied under different flow levels, and it was concluded that the water flow in the nest had a counterclockwise backflow, and the backflow intensity gradually weakened from the side wall to the center. And the phenomenon that the surface layer and the bottom water flow are separated, and this phenomenon becomes more prominent with the increase of the flow rate.

APA, Harvard, Vancouver, ISO, and other styles

5

Marano, Giuseppe C., Fabrizio Palmisano, and Pasquale Perilli. "Building in ‘Aggregate’ in Barletta." In Case Studies on Failure Investigations in Structural and Geotechnical Engineering. International Association for Bridge and Structural Engineering (IABSE), 2023. http://dx.doi.org/10.2749/cs004.ch03.

Full text

Abstract:

This chapter presents the forensic investigations relevant to the collapse of a building in ‘aggregate’ that occurred in Barletta (Puglia, South Italy) on the morning of the 3rd October 2011, causing five fatalities. According to the Italian technical standards, a building aggregate consists of a set of adjacent buildings that is the result of an articulated and not unitary genesis due to multiple factors. Some recent Italian collapses, such as that occurred in Barletta, have highlighted that the approach to be used in the relevant forensic investigations is not so obvious and simple. The aim of the article is to describe the different approaches used in the investigations by different consultants and their different conclusions on the trigger of the collapse.

APA, Harvard, Vancouver, ISO, and other styles

6

Haldon, John. "Collapse and Non-collapse." In How Worlds Collapse. Routledge, 2023. http://dx.doi.org/10.4324/9781003331384-10.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Gooch, Jan W. "Collapse." In Encyclopedic Dictionary of Polymers. Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_2584.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Abbasi, Adeel, Francis DeRoos, José Artur Paiva, et al. "Collapse." In Encyclopedia of Intensive Care Medicine. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-00418-6_1374.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

O’Hara, Glen. "Collapse." In Britain and the Sea. Macmillan Education UK, 2010. http://dx.doi.org/10.1007/978-1-137-07312-9_9.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Johnsen, Gudrun. "Collapse." In Bringing Down the Banking System. Palgrave Macmillan US, 2014. http://dx.doi.org/10.1057/9781137347350_2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Collapsar"

1

Jakobsen, Svein Erik, Trond Even Eggen, Kjell Malo, and Magne Bjertnæs. "The Tretten Timber Bridge collapse, forensic engineering." In IABSE Congress, San José 2024: Beyond Structural Engineering in a Changing World. International Association for Bridge and Structural Engineering (IABSE), 2024. https://doi.org/10.2749/sanjose.2024.0692.

Full text

Abstract:

<p>Timber Bridges has the prospects of being environmentally friendly and well adapted to future sustainability requirements. Norway has been a pioneer market for major timber bridges and has as per now around 250 timber bridges of this kind. This market experiences a major setback after Tretten Bridge collapsed in 2022. Tretten Bridge was a major timber truss bridge, and the paper will describe the comprehensive forensic engineering work performed in order to find and document the reason for this severe collapse. This work comprised advanced structural analyses and material tests, as well as evaluation of background material, collapsed specimens and witness observations. Many scenarios were investigated until the final reason for the collapse was revealed.</p>

APA, Harvard, Vancouver, ISO, and other styles

2

Al-Amina, Md Sohel Rana, Rana Md Masuda, Das Sumon Chandra, and Al Amin Sarder. "A Simplified Approach to Accessing Earthquake-Induced Debris from Collapse of RC Frame Structures." In IABSE Congress, San José 2024: Beyond Structural Engineering in a Changing World. International Association for Bridge and Structural Engineering (IABSE), 2024. https://doi.org/10.2749/sanjose.2024.0283.

Full text

Abstract:

<p>It is widely acknowledged that earthquakes can cause significant destruction to buildings, and there is typically a large amount of debris that may impede transportation and delay the arrival of assistance if the collapsed buildings were linked to road networks. This study evaluates the debris extent from the collapse of intermediate RC frame structures through numerical simulations. Three Intermediate RC structures are selected to find the potential debris extent around the original envelope. Twenty-three ground motion records are applied to investigate the different collapse patterns of the structures. The results show that the building may face four types of collapse: positive and negative aligned and skewed. Furthermore, a relation between debris extent and probability of exceedance based on the median and variance values has been proposed. This study is of great importance to create an interdisciplinary approach to assessing the earthquake resilience of a street network.</p>

APA, Harvard, Vancouver, ISO, and other styles

3

Mistry, Saleem Parvez. "The Quebec Bridge Collapse (1907): an Engineer’S Perspective to Avoid Catastrophic Failures." In MPWT 2019. NACE International, 2019. https://doi.org/10.5006/mpwt19-14244.

Full text

Abstract:

Abstract The failure assessment of the collapse of the Quebec Bridge in 1907 conducted by the Royal Commission is discussed in the following paper. The Quebec Bridge is a 987.5 m long; 29 m wide; and 104 m high riveted steel truss structure which collapsed not once but twice during construction. The reason for the bridge failure was attributed to member behavior and stability proved by experimental work conducted following the collapse by Royal Commission. The bridge was finally completed in 1917 and has been in operation since then. The lessons learned from the bridge collapse were pivotal in the advancement of engineering design, fabrication and formation of the two organizations, namely - the American Association of State Highway and Transportation Officials (AASHTO) in 1914 and American Institute of Steel Construction (AISC) in 1921. The author highlights the importance of validating the design criteria and specifications by material and load testing, conducting peer reviews, design control, and paying attention to details. The lessons learned reinforce the need to establish and monitor shop fabrication practices, inspection procedures and gates (witness, hold and review points) to safely complete the execution of any civil engineering project, be it onshore or offshore construction.

APA, Harvard, Vancouver, ISO, and other styles

4

Leon, Javier, Javier Torrico, Isabel Lorenzo, Benedetta Orfeo, and Iñaki Jaime. "Restoration of a masonry Bridge in Deba (Spain)." In IABSE Congress, San José 2024: Beyond Structural Engineering in a Changing World. International Association for Bridge and Structural Engineering (IABSE), 2024. https://doi.org/10.2749/sanjose.2024.0138.

Full text

Abstract:

<p>This paper deals with the singular rehabilitation process carried out to partially rebuild a masonry bridge over the Deba River (Spain). The central pier of this built heritage suffered, on July 2018, a one-meter sudden settlement provoking a partial collapse of the adjacent vaults, leaving the structure in a precarious condition and exposing it to a global collapse. This paper provides a detailed description of the structural system, main load-bearing elements, materials and the anastylosis-based method to rebuild the collapsed vaults. All the activities were supported by a combination of ancient construction techniques obtained from old treatises on masonry bridges and actual cutting-edge technologies. This paper raises awareness about the importance of studying construction history for proper restoring the built heritage. The intervention was awarded with the Grand Prix Europa Nostra award in the category "Conservation and Adaptation to New Uses" in the 2023 call.</p>

APA, Harvard, Vancouver, ISO, and other styles

5

Anderson, William B., Richard F. Salant, and Jacek Jarzynski. "Detection of Lubricating Film Breakdown in Mechanical Seals." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-1267.

Full text

Abstract:

Abstract Mechanical seals generally fail as the result of the collapse of the lubricating film between the two seal faces. A system to detect the collapse of the film before mechanical and thermal damage is sustained is being developed. The approach involves placing piezoelectric transducers behind the seal faces. One of the transducers is used as a receiver, while the other is used as a source. A continuous series of ultrasonic wave packets of a specified primary frequency and amplitude are generated by the source, using a wave generator. When the lubricating film collapses, mechanical contact between the two seal faces occurs, providing a transmission path for ultrasonic waves. The signal amplitude detected by the receiver therefore indicates whether or not mechanical contact between the seal faces has occurred. The advantage of this approach is it is relatively independent of the particular seal characteristics. Furthermore, since the amplitude and frequency of the signal generated by the source can be controlled, it can be distinguished from machinery noise.

APA, Harvard, Vancouver, ISO, and other styles

6

MacFadyen, A. I. "Collapsar Disks and Winds." In GAMMA-RAY BURST AND AFTERGLOW ASTRONOMY 2001: A Workshop Celebrating the First Year of the HETE Mission. AIP, 2003. http://dx.doi.org/10.1063/1.1579338.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

DERMER, CHARLES D. "THE COLLAPSAR AND SUPRANOVA MODELS." In Proceedings of the MG10 Meeting held at Brazilian Center for Research in Physics (CBPF). World Scientific Publishing Company, 2006. http://dx.doi.org/10.1142/9789812704030_0029.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Gómez, Enrique A. "Collapsar Jet Stability at Breakout." In GAMMA-RAY BURSTS: 30 YEARS OF DISCOVERY: Gamma-Ray Burst Symposium. AIP, 2004. http://dx.doi.org/10.1063/1.1810847.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Nagataki, Shigehiro, and Shinya Wanajo. "R-process nucleosynthesis in a collapsar." In International Symposium on Nuclear Astrophysics - Nuclei in the Cosmos - IX. Sissa Medialab, 2010. http://dx.doi.org/10.22323/1.028.0214.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

MacFadyen, A. I. "The collapsar model for gamma-ray bursts." In The first KIAS astrophysics workshop: Explosive phenomena in astrophysical compact objects. AIP, 2001. http://dx.doi.org/10.1063/1.1368288.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Collapsar"

1

Miller, Jonah. Time scales for advection and (de)leptonization in a collapsar. Office of Scientific and Technical Information (OSTI), 2021. http://dx.doi.org/10.2172/1818086.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Blyde, Juan S., Eduardo Fernández-Arias, and Christian Daude. Output Collapses and Productivity Destruction. Inter-American Development Bank, 2009. http://dx.doi.org/10.18235/0010905.

Full text

Abstract:

This paper analyzes the long-run relationship between output collapsesdefined defined as GDP falling substantially below trendand total factor productivity (TFP), using a panel of 71 developed and developing countries during the period 1960-2003 to identify episodes of output collapse and estimate counterfactual post-collapse TFP trends. Collapses are concentrated in developing countries, especially African and Latin American, and were particularly widespread in the 1980s in Latin America. Overall, output collapses are systematically associated with long-lasting declines in TFP. The paper explores the conditions under which collapses are least or most damaging, as well as the type of shocks that make collapses more likely or severe, and additionally quantifies the welfare cost associated with output collapses.

APA, Harvard, Vancouver, ISO, and other styles

3

Wayne, Zachariah, Philip Carey, and Matthew Palmer. Reinforced Autoclaved Aerated Concrete (RAAC) in England: Assessment of risk of collapse. HSE, 2025. https://doi.org/10.69730/hse.24rr1213.

Full text

Abstract:

This report by WSP UK Ltd, presents an initial estimate of the number of reinforced autoclaved aerated concrete (RAAC) panels that may collapse in England, and the likelihood of those collapses occurring whilst people are below RAAC panels. Failure mechanisms, risk factors for collapse and measures for inspecting, monitoring and mitgating RAAC panels

APA, Harvard, Vancouver, ISO, and other styles

4

Meneses, Juan Francisco, and José Luis Saboin. Growth Recoveries (from Collapses). Inter-American Development Bank, 2021. http://dx.doi.org/10.18235/0003419.

Full text

Abstract:

This paper analyzes the behavior of a long list of economic variables during episodes of recovery from an economic collapse. A set of stylized facts is proposed so as to depict what in this work is called \saygrowth recoveries. Through different estimation techniques, it is inferred under which conditions and policies the likelihood of experiencing a growth recovery increases. The results of the paper indicate that collapses tend to occur in countries with high dependence on natural resource rents, macroeconomic mismanagement, low levels of democratic accountability and rule of law and high levels of conflict. Recoveries, on the other hand, tend to be longer than collapses and are more likely to occur in contexts of: improved external conditions, less natural resource rents, balanced fiscal accounts, where the exchange rate corrects but within a more fixed exchange rate regime and a more restricted financial account, and where there are: rebounds in private consumption, increases in international trade and improvements on property rights.

APA, Harvard, Vancouver, ISO, and other styles

5

Esquivel, Maricarmen, Tsuneki Hori, Taichi Minamitani, et al. Lessons Learnt from Japan and Latin America and Caribbean Countries in Management Hazard Resilient Infrastructure: A JICA-IDB Joint Research. Inter-American Development Bank, 2017. http://dx.doi.org/10.18235/0009373.

Full text

Abstract:

The Latin America and the Caribbean (LAC) region is one of the most disaster-prone areas in the world. Disasters have increasingly devastated the development effectiveness of the LAC countries. Had infrastructure been constructed with additional measures to prevent collapses due to natural hazard impacts, the region would have saved in the long run a significant amount of the public, private and human capital allocated to repairs and reconstruction. A key question is: what are the factors involved in preventing infrastructure collapse due to natural hazard impacts and how might these measures be implemented? This paper discusses the LAC countries’ sustainable infrastructure that has been shown to be resilient, continuing to operate without collapse even during hazardous events. The study reviews (i) the good practices for reducing vulnerability in Japan, (ii) the overall progress of LAC countries on disaster risk management, and (iii) the recent infrastructure damages due to disasters in LAC region and identifies lessons. Finally, using a comparative analysis of a selected case studies in LAC and Japan, the study identifies four approaches for hazard resilient infrastructure in the LAC region.

APA, Harvard, Vancouver, ISO, and other styles

6

Stroup, David W., Daniel Madrzykowski, William D. Walton, and William Twilley. Structural collapse fire tests:. National Institute of Standards and Technology, 2003. http://dx.doi.org/10.6028/nist.ir.6959.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Stroup, David W., Nelson P. Bryner, Jack LeeJay McElroy, Gary Roadarmel, and William H. Twilley. Structural collapse fire tests:. National Institute of Standards and Technology, 2004. http://dx.doi.org/10.6028/nist.ir.7094.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Mayle, R., J. R. Wilson, and D. N. Schramm. Neutrinos from gravitational collapse. Office of Scientific and Technical Information (OSTI), 1986. http://dx.doi.org/10.2172/5612991.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Bems, Rudolfs, Robert Johnson, and Kei-Mu Yi. The Great Trade Collapse. National Bureau of Economic Research, 2012. http://dx.doi.org/10.3386/w18632.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Barth, Theodor, Bjørn Blikstad, Tale Næss, and Petrine Vinje. Archaeology - Collapse, bodywork, resurrection. Universitetet i Bergen KMD, 2021. http://dx.doi.org/10.22501/kmd-ar.1190576.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!