作者: 珊瑚 時(shí)間: 2025-3-22 00:03
Environments and Rates of Supernovaeminated by old stellar populations, indicating that SN Ia do not arise from core collapse. Determinations of occurrence rates of supernovae in other galaxies suggest that our Milky Way galaxy should produce about 3 supernovae per century, 20% SN Ia, 30% SN IIb, Ib and Ic, and 50% SN IIP. The chapter作者: 女上癮 時(shí)間: 2025-3-22 03:40 作者: vitrectomy 時(shí)間: 2025-3-22 05:25 作者: 災(zāi)難 時(shí)間: 2025-3-22 11:09
Supernova Remnants181 shows some similarities to the Crab. The remnant of Tycho Brahe’s supernova of 1572 is that of a typical SN Ia. The SNRs of SN 1006 and that seen by Johannes Kepler in 1604 are virtually certain remnants of SN Ia, though SN 1604 is likely to be interacting with circumstellar matter. The discussi作者: 紀(jì)念 時(shí)間: 2025-3-22 13:16
Evolution to Catastrophe the chapter is devoted to the complex effects of rotation on single-star evolution. Another section addresses the equally complex topic of binary-star evolution, which is essential to understanding the origin of Type Ia supernovae and probably of most stripped-envelope supernovae (Types IIb, Ib, an作者: 生存環(huán)境 時(shí)間: 2025-3-22 20:30
Core Collapseest entropy and requires an equation of state for hot nuclear matter that incorporates nuclear excitation. Weak interactions associated with neutrino transport are of paramount importance. The postbounce dynamics yield a core in hydrostatic equilibrium and a standing shock that is intrinsically subj作者: 仔細(xì)閱讀 時(shí)間: 2025-3-23 00:24
Pair-Instability Supernova Modelsn. Models of somewhat lower ZAMS mass than those of PISN models undergo pulsations (hence PPISN) induced by pair production that may eject multiple interacting shells; these interactions may themselves produce bright supernova-like displays. The PPISN phase is followed by core collapse or a PISN exp作者: Inscrutable 時(shí)間: 2025-3-23 04:23
Supernova 1987Aet through the far-infrared. Gamma-ray, X-ray, and submillimeter bands provided key spectra. Observations have revealed the formation of dust and molecules. There is ample evidence for asymmetries induced by the explosion and by instabilities in the subsequent expansion. Speckle observations and spe作者: GIBE 時(shí)間: 2025-3-23 06:37
Type IIP Supernovaeed supergiants, consistent with theoretical expectation and analysis of observations, and that the initial masses of these stars were in the range of about 8–16 solar masses, with most of them near the lower end of this range.作者: 起草 時(shí)間: 2025-3-23 13:32 作者: Chronological 時(shí)間: 2025-3-23 16:08
Type IIb Supernovaes of interaction with circumstellar matter. Models suggest that SN IIb arise in stars of modestly high mass, about 10–18 solar masses, probably in binary systems, and that the masses of the collapsing cores are several solar masses.作者: 運(yùn)動(dòng)的我 時(shí)間: 2025-3-23 19:17 作者: 傷心 時(shí)間: 2025-3-24 00:17 作者: ICLE 時(shí)間: 2025-3-24 03:11
0941-7834 such data, and an overview of the evolution of stars that brings them to an explosive endpoint. Part 2 goes into more detail on core-collapse and superluminous events: which kinds of stars produce them, and ho978-3-662-57223-8978-3-662-55054-0Series ISSN 0941-7834 Series E-ISSN 2196-9698 作者: stress-test 時(shí)間: 2025-3-24 07:20
ompressibility of the fluid, essentially requiring that the “scale-height” of the system be much larger than the vertical extent of the fluid. This is a very good approximation in the ocean but obviously much weaker in the atmosphere, where in fact we should, finally, consider the effects of compres作者: Minikin 時(shí)間: 2025-3-24 10:52 作者: 獨(dú)特性 時(shí)間: 2025-3-24 16:37 作者: MIME 時(shí)間: 2025-3-24 21:21 作者: 抓住他投降 時(shí)間: 2025-3-25 00:19
David Branch,J. Craig Wheelers of deformation, though finite, must be kept small. Topographic effects continue to dominate in this limit if the flow contacts the bottom, but topography is irrelevant if the coastal flow takes place in a surface layer, insulated from the bottom by an inactive deeper layer. Sidewall curvature then作者: 背書 時(shí)間: 2025-3-25 04:04 作者: embolus 時(shí)間: 2025-3-25 10:43 作者: 有限 時(shí)間: 2025-3-25 12:56 作者: Pedagogy 時(shí)間: 2025-3-25 16:53
David Branch,J. Craig Wheeleron-maker (i.e. Chief Engineer). Students are held accountable for making specific recommendations and supporting their recommendations with simulation and test results. Most students claim that they enjoy this experience more than traditional lab activities and that the use of context motivates them作者: homocysteine 時(shí)間: 2025-3-25 23:24
t to composite materials and therefore, a further degree of precision on the testing and simulation is necessary for the successful validation of these components..The experimental modal analysis is performed by the combination of a 3D Scanning Laser Doppler Vibrometer and a scalable automatic modal作者: intrude 時(shí)間: 2025-3-26 02:20 作者: 者變 時(shí)間: 2025-3-26 05:12
David Branch,J. Craig Wheelerasi-full field) of the structure if compared to traditional hardware. Combining CNN with long short-term memory (LSTM) network will associate the temporal dependency of the frames with its features which will be more specific for SHM decision-makings. In addition, for the circumstances with low vibr作者: Colonnade 時(shí)間: 2025-3-26 08:53
David Branch,J. Craig Wheelerning them to specific feature points in the in the motion-magnified sequence of images. This study shows that the cluster centers can be employed to estimate the ODS vectors, and the performance of the proposed methodology is evaluated experimentally on a lab-scale cantilever beam and validated via 作者: calumniate 時(shí)間: 2025-3-26 14:12 作者: Monotonous 時(shí)間: 2025-3-26 19:28
Astronomy and Astrophysics Libraryhttp://image.papertrans.cn/t/image/881887.jpg作者: Fraudulent 時(shí)間: 2025-3-26 21:56
https://doi.org/10.1007/978-3-662-55054-0Supernova observations; Supernova remnants; Supernova research; Core-collapse supernovae; Stellar explos作者: 里程碑 時(shí)間: 2025-3-27 02:39 作者: Detain 時(shí)間: 2025-3-27 07:18 作者: Diuretic 時(shí)間: 2025-3-27 11:09 作者: 財(cái)產(chǎn) 時(shí)間: 2025-3-27 16:17 作者: 一大塊 時(shí)間: 2025-3-27 21:34 作者: tackle 時(shí)間: 2025-3-28 00:51
Light Curvesrgy. The chapter outlines the sources of energy and radiation mechanisms that shape the light curves: breakout shocks and associated fireballs, radioactive decay, pulsars and magnetars. These principles are then applied to specific types of supernovae: Type Ia, stripped-envelope core-collapse events, Type II, and SN 1987A.作者: 一夫一妻制 時(shí)間: 2025-3-28 05:23 作者: TAP 時(shí)間: 2025-3-28 07:30
Overviewvae witnessed by humanity over millennia remain targets of modern research. Contemporary systematic discoveries spanning nearly a century proceed at an ever-increasing rate. The chapter presents the basic properties of supernovae: the systems of their classification, primarily by spectra but also by作者: moratorium 時(shí)間: 2025-3-28 12:08 作者: HPA533 時(shí)間: 2025-3-28 15:51
Environments and Rates of Supernovaelar progenitors of supernovae, particularly those of Type IIP (SN IIP). The progenitors of SN IIP were red supergiants at the time of explosion; their inferred initial main-sequence masses have ranged from about 8-16 solar masses, with most near the lower end of this range. Supernovae of Types IIP, 作者: 約會(huì) 時(shí)間: 2025-3-28 19:16 作者: 繁忙 時(shí)間: 2025-3-29 00:43 作者: packet 時(shí)間: 2025-3-29 05:36
Circumstellar Interactionntext of core-collapse supernovae. Hydrodynamic interaction between the supernova ejecta and CSM produced by a wind from the progenitor star leads to a forward shock that accelerates and heats the inner layers of the CSM, a reverse shock that reheats the outer layers of the ejecta, and a thin intera作者: 諂媚于人 時(shí)間: 2025-3-29 11:03
Supernova Remnantsds of SNRs are known in the Milky Way and nearby galaxies, primarily revealed by their radio and X-ray flux. The discussion outlines the key phases of SNR evolution: early free expansion, the adiabatic or Sedov phase, and the radiative, snowplow phase. The focus then turns to young SNRs in the Galax作者: 種類 時(shí)間: 2025-3-29 12:53 作者: 慟哭 時(shí)間: 2025-3-29 16:16 作者: Diatribe 時(shí)間: 2025-3-29 20:31
Pair-Instability Supernova Modelsn-positron pair production in an offcenter shell. The infalling shell compresses and heats the oxygen core to the point of thermonuclear ignition and explosion of (usually) the entire star. The nominal oxygen core masses and zero-age main-sequence (ZAMS) masses for nonrotating, solar-abundance model作者: FEAS 時(shí)間: 2025-3-30 00:53
Supernova 1987Aing the blue-supergiant supernova progenitor and the remarkable triple-ring system in the circumstellar environment with which the ejecta interact. The unique detection of neutrinos confirmed the basic model of core collapse. The compact object left behind probably is a neutron star, but there has b作者: OMIT 時(shí)間: 2025-3-30 07:43 作者: 萬(wàn)靈丹 時(shí)間: 2025-3-30 08:59 作者: 繁榮地區(qū) 時(shí)間: 2025-3-30 14:56 作者: 顛簸地移動(dòng) 時(shí)間: 2025-3-30 18:32
Type IIb Supernovaea few tenths of a solar mass of their original hydrogen envelopes. Their spectral evolution reveals significant Balmer lines soon after explosion that fade and become supplanted by strong lines of helium, giving evidence that the photosphere has retreated through the hydrogen envelope and into the h作者: 教育學(xué) 時(shí)間: 2025-3-30 20:45 作者: 鳥籠 時(shí)間: 2025-3-31 01:14
Type Ic Supernovae or helium in their ejecta. Nebular spectra have features that are typical of core-collapse supernovae. SN Ic are of typical peak luminosity. The light-curve shapes of SN Ic are somewhat heterogeneous, being rather similar near peak but showing a range of late-time decline rates. Some, but not all, 作者: 社團(tuán) 時(shí)間: 2025-3-31 09:02
Type IIL Supernovaes. To add to the ambivalence, many SN IIL have narrow emission lines that are similar to those that are the hallmark of Type IIn (SN IIn; Chapter “Type IIn Supernovae”). Rather than constituting a distinct class, SN IIL may represent a transition from SN IIP to SN IIn depending on the extent and/or timing of presupernova progenitor mass loss.作者: anesthesia 時(shí)間: 2025-3-31 11:41
Book 2017avid Branch and J. Craig Wheeler offer a modern account of the nature, causes and consequences of supernovae, as well as of issues that remain to be resolved..Owing especially to (1) the appearance of supernova 1987A in the nearby Large Magellanic Cloud, (2) the spectacularly successful use of super作者: 失敗主義者 時(shí)間: 2025-3-31 13:44
n particular these motions take place in a fluid that is compressible, stratified and rotating on a spherical surface. Thus any general theory is necessarily complex and any simplifying concepts lost in the overwhelming mass of mathematical details. It therefore behooves us to make rational assumpti作者: Mendacious 時(shí)間: 2025-3-31 19:43
n particular these motions take place in a fluid that is compressible, stratified and rotating on a spherical surface. Thus any general theory is necessarily complex and any simplifying concepts lost in the overwhelming mass of mathematical details. It therefore behooves us to make rational assumpti作者: 袋鼠 時(shí)間: 2025-4-1 01:18 作者: Eulogy 時(shí)間: 2025-4-1 05:45
David Branch,J. Craig Wheelern particular these motions take place in a fluid that is compressible, stratified and rotating on a spherical surface. Thus any general theory is necessarily complex and any simplifying concepts lost in the overwhelming mass of mathematical details. It therefore behooves us to make rational assumpti
