Multi-Criteria Decision-Making and its Analysis for Machining Process of Mine Fans Impellers

Liu, Ai Jun; Liu, De Shun; Yue, Wen Hui

doi:10.4028/www.scientific.net/kem.522.103

Cited by 6 publications

(6 citation statements)

References 3 publications

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“…Conversely, ASAS-SN discoveries have median offsets of 4.9 arcsec and 2.6 kpc, indicating that ASAS-SN is less biased against discoveries close to the host nucleus than either comparison group. The three other professional groups with the most discoveries in our comparison sample are CRTS (Drake et al 2009), MASTER (Gorbovskoy et al 2013) and LOSS (Li et al 2000), which either do not use difference imaging or ignore central regions of galaxies in their searches, and this likely contributes to their larger offsets. As we pointed out in Holoien et al (2017), however, ASAS-SN continues to find a higher rate of tidal disruption events than other surveys (see Holoien et al 2016c,b), including those that do use difference imaging, which implies that the avoidance of the central regions of galaxies is still fairly common in surveys other than CRTS, MASTER and LOSS.…”

Section: Sample Analysesmentioning

confidence: 99%

The ASAS-SN Bright Supernova Catalog – II. 2015

Holoien

Brown

Stanek

et al. 2017

Mon. Not. R. Astron. Soc.

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This manuscript presents information for all supernovae discovered by the All-Sky Automated Survey for SuperNovae (ASAS-SN) during 2015, its second full year of operations. The same information is presented for bright (m V ≤ 17), spectroscopically confirmed supernovae discovered by other sources in 2015. As with the first ASAS-SN bright supernova catalogue, we also present redshifts and near-ultraviolet through infrared magnitudes for all supernova host galaxies in both samples. Combined with our previous catalogue, this work comprises a complete catalogue of 455 supernovae from multiple professional and amateur sources, allowing for population studies that were previously impossible. This is the second of a series of yearly papers on bright supernovae and their hosts from the ASAS-SN team.

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Section: Sample Analysesmentioning

confidence: 99%

The ASAS-SN Bright Supernova Catalog – II. 2015

Holoien

Brown

Stanek

et al. 2017

Mon. Not. R. Astron. Soc.

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“…The majority were discovered by PTF, and additional SNe were found by the Lick Observatory Supernova Search (Li et al 2000;Filippenko et al 2001), the Puckett Observatory Supernova Search, 14 the La Silla Quest survey (LSQ; Baltay et al 2013), the Catalina Real-time Transient Survey (Drake et al 2009a), the Italian Supernova Search Project, 15 and the Panoramic Survey Telescope and Rapid Response System (Pan-STARRS; Hodapp et al 2004). For three SNe (SN 2011ef, SN 2012an, andLSQ 12fwb), no spectra are publicly available, and we rely on the classification published in Astronomer's Telegrams and Central Bureau Electronic Telegrams by Blanchard et al (2011), Chen et al (2012, and Hadjiyska et al (2012).…”

Section: Sample Selectionmentioning

confidence: 99%

Search for Precursor Eruptions Among Type Iib Supernovae

Strotjohann

Ofek

Gal‐Yam

et al. 2015

ApJ

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The progenitor stars of several Type IIb supernovae (SNe) show indications of extended hydrogen envelopes. These envelopes might be the outcome of luminous energetic pre-explosion events, so-called precursor eruptions. We use the Palomar Transient Factory (PTF) pre-explosion observations of a sample of 27 nearby SNe IIb to look for such precursors during the final years prior to the SN explosion. No precursors are found when combining the observations in 15-day bins, and we calculate the absolute-magnitude-dependent upper limit on the precursor rate. At the 90% confidence level, SNe IIb have on average <0.86 precursors as bright as an absolute R-band magnitude of −14 in the final 3.5 years before the explosion and <0.56 events over the final year. In contrast, precursors among SNe IIn have a 5 times higher rate. The kinetic energy required to unbind a low-mass stellar envelope is comparable to the radiated energy of a few-weeks-long precursor that would be detectable for the closest SNe in our sample. Therefore, mass ejections, if they are common in such SNe, are radiatively inefficient or have durations longer than months. Indeed, when using 60-day bins, a faint precursor candidate is detected prior to SN 2012cs (∼2% false-alarm probability). We also report the detection of the progenitor of SN 2011dh that does not show detectable variability over the final two years before the explosion. The suggested progenitor of SN 2012P is still present, and hence is likely a compact star cluster or an unrelated object.

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“…There is also a renewed interest in completely characterizing the galaxies in the nearby universe, within 10 Mpc. In nearby galaxies, both amateurs and automated surveys (e.g., KAIT/LOSS [63,64]) are finding many supernovae. For these SNe, archival searches have revealed pre-explosion images of about a dozen supernova progenitor stars, allowing a better understanding of which types of massive stars lead to which kinds of core-collapse supernovae (e.g., [28,36,65,66]).…”

Section: Nearby Supernova Ratementioning

confidence: 99%

Core-collapse astrophysics with a five-megaton neutrino detector

et al. 2011

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The legacy of solar neutrinos suggests that large neutrino detectors should be sited underground. However, to instead go underwater bypasses the need to move mountains, allowing much larger wateř Cerenkov detectors. We show that reaching a detector mass scale of ∼ 5 Megatons, the size of the proposed Deep-TITAND, would permit observations of neutrino "mini-bursts" from supernovae in nearby galaxies on a roughly yearly basis, and we develop the immediate qualitative and quantitative consequences. Importantly, these mini-bursts would be detected over backgrounds without the need for optical evidence of the supernova, guaranteeing the beginning of time-domain MeV neutrino astronomy. The ability to identify, to the second, every core collapse in the local Universe would allow a continuous "death watch" of all stars within ∼ 5 Mpc, making practical many previouslyimpossible tasks in probing rare outcomes and refining coordination of multi-wavelength/multiparticle observations and analysis. These include the abilities to promptly detect otherwise-invisible prompt black hole formation, provide advance warning for supernova shock-breakout searches, define tight time windows for gravitational-wave searches, and identify "supernova impostors" by the non-detection of neutrinos. Observations of many supernovae, even with low numbers of detected neutrinos, will help answer questions about supernovae that cannot be resolved with a single highstatistics event in the Milky Way.

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Multi-Criteria Decision-Making and its Analysis for Machining Process of Mine Fans Impellers

Cited by 6 publications

References 3 publications

The ASAS-SN Bright Supernova Catalog – II. 2015

The ASAS-SN Bright Supernova Catalog – II. 2015

Search for Precursor Eruptions Among Type Iib Supernovae

Core-collapse astrophysics with a five-megaton neutrino detector

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