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  • 1
    Online Resource
    Online Resource
    Operation and performance of the ATLAS semiconductor tracker in LHC Run 2
    IOP Publishing ; 2022
    In:  Journal of Instrumentation Vol. 17, No. 01 ( 2022-01-01), p. P01013-
    Details
    In: Journal of Instrumentation, IOP Publishing, Vol. 17, No. 01 ( 2022-01-01), p. P01013-
    Abstract: The semiconductor tracker (SCT) is one of the tracking systems for charged particles in the ATLAS detector. It consists of 4088 silicon strip sensor modules. During Run 2 (2015–2018) the Large Hadron Collider delivered an integrated luminosity of 156 fb -1 to the ATLAS experiment at a centre-of-mass proton-proton collision energy of 13 TeV. The instantaneous luminosity and pile-up conditions were far in excess of those assumed in the original design of the SCT detector. Due to improvements to the data acquisition system, the SCT operated stably throughout Run 2. It was available for 99.9% of the integrated luminosity and achieved a data-quality efficiency of 99.85%. Detailed studies have been made of the leakage current in SCT modules and the evolution of the full depletion voltage, which are used to study the impact of radiation damage to the modules.
    Type of Medium: Online Resource
    ISSN: 1748-0221
    URL: Article
    DOI: 10.1088/1748-0221/17/01/P01013
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 2235672-1
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  • 2
    Online Resource
    Online Resource
    Timing analysis of the black hole candidate EXO 1846–031 with Insight-HXMT monitoring
    IOP Publishing ; 2021
    In:  Research in Astronomy and Astrophysics Vol. 21, No. 3 ( 2021-04-01), p. 070-
    Details
    In: Research in Astronomy and Astrophysics, IOP Publishing, Vol. 21, No. 3 ( 2021-04-01), p. 070-
    Abstract: We present the observational results from a detailed timing analysis of the black hole candidate EXO 1846–031 during its outburst in 2019 with the observations of Insight -HXMT, NICER and MAXI . This outburst can be classified roughly into four different states. Type-C quasi-periodic oscillations (QPOs) observed by NICER (about 0.1–6 Hz) and Insight -HXMT (about 0.7–8 Hz) are also reported in this work. Meanwhile, we study various physical quantities related to QPO frequency. The QPO rms–frequency relationship in the energy band 1–10 keV indicates that there is a turning pointing in frequency around 2 Hz, which is similar to that of GRS 1915+105. A possible hypothesis for the relationship above may be related to the inclination of the source, which may require a high inclination to explain it. The relationships between QPO frequency and QPO rms, hardness, total fractional rms and count rate have also been found in other transient sources, which can indicate that the origin of type–C QPOs is non-thermal.
    Type of Medium: Online Resource
    ISSN: 1674-4527
    URL: Article
    DOI: 10.1088/1674-4527/21/3/70
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2511247-8
    SSG: 6,25
    SSG: 16,12
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  • 3
    Online Resource
    Online Resource
    GECAM Localization of High-energy Transients and the Systematic Error
    American Astronomical Society ; 2023
    In:  The Astrophysical Journal Supplement Series Vol. 265, No. 1 ( 2023-03-01), p. 17-
    Details
    In: The Astrophysical Journal Supplement Series, American Astronomical Society, Vol. 265, No. 1 ( 2023-03-01), p. 17-
    Abstract: The Gravitational Wave High-energy Electromagnetic Counterpart All-sky Monitor (GECAM) is a pair of microsatellites (i.e., GECAM-A and GECAM-B) dedicated to monitoring gamma-ray transients including the high-energy electromagnetic counterparts of gravitational waves, such as gamma-ray bursts, soft gamma-ray repeaters, solar flares, and terrestrial gamma-ray flashes. Since launch in 2020 December, GECAM-B has detected hundreds of astronomical and terrestrial events. For these bursts, localization is the key for burst identification and classification as well as follow-up observations in multiple wavelengths. Here, we propose a Bayesian localization method with Poisson data with Gaussian background profile likelihood to localize GECAM bursts based on the distribution of burst counts in detectors with different orientations. We demonstrate that this method can work well for all kinds of bursts, especially extremely short ones. In addition, we propose a new method to estimate the systematic error of localization based on a confidence level test, which can overcome some problems of the existing method in the literature. We validate this method by Monte Carlo simulations, and then apply it to a burst sample with accurate location and find that the mean value of the systematic error of GECAM-B localization is ∼2.°5. By considering this systematic error, we can obtain a reliable localization probability map for GECAM bursts. Our methods can be applied to other gamma-ray monitors.
    Type of Medium: Online Resource
    ISSN: 0067-0049 , 1538-4365
    URL: Article
    DOI: 10.3847/1538-4365/acafeb
    RVK:
    UA 1000
    Language: Unknown
    Publisher: American Astronomical Society
    Publication Date: 2023
    detail.hit.zdb_id: 2006860-8
    detail.hit.zdb_id: 2207650-5
    SSG: 16,12
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  • 4
    Online Resource
    Online Resource
    Impulse Noise Filtering Algorithm Based on Dual Threshold Criterion
    Trans Tech Publications, Ltd. ; 2013
    In:  Applied Mechanics and Materials Vol. 437 ( 2013-10), p. 849-852
    Details
    In: Applied Mechanics and Materials, Trans Tech Publications, Ltd., Vol. 437 ( 2013-10), p. 849-852
    Abstract: In order to filter the impulse noise existing in the weld surface defect images, the traditional median filtering will dim image, even destroy some details in the image, We put forward a new filtering algorithm based on dual threshold Criterion. This way distinguishes the noise point and signal location in the first, and it only doing median filter to the noise point. Lastly, it solves the image’s boundary. We can find it when compared to the traditional median filtering and modified extremum median filtering, the way in this article can be good for filtration, and can keep the image’s details, which have obvious advantage.
    Type of Medium: Online Resource
    ISSN: 1662-7482
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMM.437
    DOI: 10.4028/www.scientific.net/AMM.437.849
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2013
    detail.hit.zdb_id: 2251882-4
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  • 5
    Online Resource
    Online Resource
    Chemical Structure of Fluorocarbon Films Deposited by Pulsed Plasma Thruster
    Trans Tech Publications, Ltd. ; 2012
    In:  Advanced Materials Research Vol. 602-604 ( 2012-12), p. 1465-1469
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 602-604 ( 2012-12), p. 1465-1469
    Abstract: Fluorocarbon films were deposited using a Pulsed Plasma Thruster. By means of mass spectrum analysis, the compositions of the Pulsed Plasma Thruster plume were studied. The microstructure and chemical bonding nature of the films were investigated by X-ray photoelectron spectroscopy. The plume consists primarily of C, F, CF, CF 2 , CF 3 , amounts of thruster body materials are detected as well. Five chemical bonds, CF 3 , CF 2 , CF, C-CF x , and elemental carbon bonds are observed on the surface of all the deposited films, the content of the various chemical bonds change with deposited angle, the F/C ratio reaches a minimum value of 0.7643 at 15 degree, and increases gradually with deposited angle increasing from 15 degree to 60 degree.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.602-604
    DOI: 10.4028/www.scientific.net/AMR.602-604.1465
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2012
    detail.hit.zdb_id: 2265002-7
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  • 6
    Online Resource
    Online Resource
    Presentation_1.pdf
    Frontiers Media SA ; 2022
    In:  Frontiers in Physiology Vol. 13 ( 2022-2-16)
    Details
    In: Frontiers in Physiology, Frontiers Media SA, Vol. 13 ( 2022-2-16)
    Abstract: The Tachinidae are natural enemies of many lepidopteran and coleopteran pests of crops, forests, and fruits. However, host-tachinid parasitoid interactions have been largely unexplored. In this study, we investigated the effects of tachinids on host biological traits, using Exorista japonica , a generalist parasitoid, and the silkworm Bombyx mori , its lepidopteran host, as models. We observed that E. japonica parasitoidism did not affect silkworm larval body weight gain and cocooning rate, whereas they caused shortened duration of molting from the final instar to the pupal stage, abnormal molting from larval to pupal stages, and a subsequent decrease in host emergence rate. Moreover, a decrease in juvenile hormone (JH) titer and an increase in 20-hydroxyecdysone (20E) titer in the hemolymph of parasitized silkworms occurred. The transcription of JH and 20E responsive genes was downregulated in mature parasitized hosts, but upregulated in parasitized prepupae while Fushi tarazu factor 1 ( Ftz-f1 ), a nuclear receptor essential in larval ecdysis, showed dramatically reduced expression in parasitized hosts at both the mature and prepupal stages. Moreover, the transcriptional levels of BmFtz-f1 and its downstream target genes encoding cuticle proteins were downregulated in epidermis of parasitized hosts. Meanwhile, the content of trehalose was decreased in the hemolymph, while chitin content in the epidermis was increased in parasitized silkworm prepupae. These data reveal that the host may fine-tune JH and 20E synthesis to shorten developmental duration to combat established E. japonica infestation, while E. japonica silences BmFtz-f1 transcription to inhibit host pupation. This discovery highlights the novel target mechanism of tachinid parasitoids and provides new clues to host/tachinid parasitoid relationships.
    Type of Medium: Online Resource
    ISSN: 1664-042X
    URL: Article
    URL: Article
    DOI: 10.3389/fphys.2022.824203
    DOI: 10.3389/fphys.2022.824203.s001
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2022
    detail.hit.zdb_id: 2564217-0
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