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  • 1
    Online Resource
    Online Resource
    Baishideng Publishing Group Inc. ; 2011
    In:  World Journal of Gastroenterology Vol. 3, No. 1 ( 2011), p. 41-
    In: World Journal of Gastroenterology, Baishideng Publishing Group Inc., Vol. 3, No. 1 ( 2011), p. 41-
    Type of Medium: Online Resource
    ISSN: 1007-9327
    Language: English
    Publisher: Baishideng Publishing Group Inc.
    Publication Date: 2011
    detail.hit.zdb_id: 2084831-6
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  • 2
    In: The Astrophysical Journal Supplement Series, American Astronomical Society, Vol. 264, No. 1 ( 2023-01-01), p. 5-
    Abstract: The Earth occultation technique has broad applications in both astronomy and atmospheric density measurements. We construct the background model during the occultation of the Crab Nebula observed by the Insight-Hard X-ray Modulation Telescope (Insight-HXMT) at energies between 6 and 100 keV. We propose a Bayesian atmospheric density retrieval method based on the Earth occultation technique, combining Poisson and Gaussian statistics. By modeling the atmospheric attenuation of X-ray photons during the occultation, we simultaneously retrieved the neutral densities of the atmosphere at different altitude ranges. Our method considers the correlation of densities between neighboring atmospheric layers and reduces the potential systematic bias to which previous work may be subject. Previous analyses based on light-curve fitting or spectral fitting also lost some spectral or temporal information of the data. In contrast to previous work, the occultation data observed by the three telescopes on board Insight-HXMT is fully used in our analysis, further reducing the statistical error in density retrieval. We apply our method to cross-check the (semi)empirical atmospheric models, using 115 sets of occultation data of the Crab Nebula observed by Insight-HXMT. We find that the retrieved neutral density is ∼10%, ∼20%, and ∼25% less than the values of the widely used atmospheric model NRLMSISE-00, in the altitude range of 55–80 km, 80–90 km, and 90–100 km, respectively. We also show that the newly released atmospheric model NRLMSIS 2.0 is generally consistent with our density measurements.
    Type of Medium: Online Resource
    ISSN: 0067-0049 , 1538-4365
    RVK:
    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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  • 3
    In: Life Sciences, Elsevier BV, Vol. 252 ( 2020-07), p. 117612-
    Type of Medium: Online Resource
    ISSN: 0024-3205
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2020
    detail.hit.zdb_id: 2013911-1
    SSG: 12
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  • 4
    Online Resource
    Online Resource
    JVE International Ltd. ; 2017
    In:  Journal of Vibroengineering Vol. 19, No. 5 ( 2017-8-15), p. 3926-3938
    In: Journal of Vibroengineering, JVE International Ltd., Vol. 19, No. 5 ( 2017-8-15), p. 3926-3938
    Abstract: This paper established a computational model for the flow field of landing gear and extracted the velocity and vorticity distribution of flow field. A lot of shedding vortexes presented around the torque arm and pillar of landing gear and had the greatest impact on the flow field around the landing gear. Then, the aerodynamic noise of landing gear was measured in an anechoic chamber. The working noises of landing gear were more than background noises of landing gear. Their change trends were similar. Obvious peak frequencies presented at the front end of noise spectrum. In addition, peak frequencies increased with the increase of flow velocity. There were multiple peak frequencies on the curve of spectral characteristics. These frequencies were from pure sound in noises. Pure sound did not change with the change of flow velocity. The difference value of total sound pressure level of working noises and background noises was less than 10 dB. However, the difference value was bigger and bigger with the increase of flow velocity. When flow velocity was more than 50 m/s, background noises were over 10 dB lower than the total sound pressure level of working noises. Thus, it showed that the aerodynamic noise source of landing gear could be effectively recognized by experimental equipment. In addition, the total sound pressure level of aerodynamic noises of landing gear also increased with the increase of flow velocity and was directly proportional to the 6th power of flow velocity. The main noise source in experiments was dipole source. Finally, aerodynamic noises were obtained by AML model of landing gear, and compared with experimental results, showing consistent value and change trend. It showed that the computational model of noises was reliable. Based on the computational model of noises, this paper studied the contribution of pillar and torque arm of landing gear to radiation noises. Results showed that the pillar of landing gear was the main reason for radiation noises. In the future, pillar noises will be reduced through conducting structural design for the pillar of landing gear or applying sound package, further reducing radiation noises.
    Type of Medium: Online Resource
    ISSN: 1392-8716 , 2538-8460
    Language: English
    Publisher: JVE International Ltd.
    Publication Date: 2017
    detail.hit.zdb_id: 2942992-4
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  • 5
    Online Resource
    Online Resource
    Trans Tech Publications, Ltd. ; 2009
    In:  Key Engineering Materials Vol. 407-408 ( 2009-2), p. 528-532
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 407-408 ( 2009-2), p. 528-532
    Abstract: Warpage deformation is an inevitable phenomenon as a cantilever sheet part is machined by combined saw milling tool. This problem affects machining quality obviously. In order to find the formation mechanism and a suitable solution, the paper carried out a qualitative analysis of the warpage causations, clarified the relationships of many factors and carried out quantitative analysis through the combined method of AdvantEdge FEM and Ansys. Furthermore, experiments of residual stress release and warpage solution were carried out in order to verify the correctness of theory analysis results. As is shown by the research results, warpage has already formed during residual stress formation. The causation of warpage is the unreasonable cutting path and the residual stress imbalance of the up and down sheet plane. The solution can control the warpage deformation well. The research results have an explicit guiding function to the actual production.
    Type of Medium: Online Resource
    ISSN: 1662-9795
    URL: Issue
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2009
    detail.hit.zdb_id: 2073306-9
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  • 6
    Online Resource
    Online Resource
    Trans Tech Publications, Ltd. ; 2010
    In:  Key Engineering Materials Vol. 431-432 ( 2010-3), p. 479-482
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 431-432 ( 2010-3), p. 479-482
    Abstract: With increasing spindle speed the cutting will be easy to enter into micro-feed cutting region. In the paper, the chip thickness and shape of high-speed and micro-feed cutting was researched in orthogonal milling. The cutting times in different fz was analyzed. We calculate the effective rake angle, friction angle and shear angle Furthermore, we measure cutting edge arc wear and tool flank wear of micro-feed cutting. Shown as the research results, the phenomenon of empty cutting and pure extrusion is very obvious as the feed rate per tooth is lower than 0.011mm/z. As the feed rate per tooth is lower than 0.005mm/z, the tool wear form is mainly cutting edge arc wear. As fz achieves 0.015mm/z, tool wear will decrease obviously and the tool appears the self-sharpening phenomenon.
    Type of Medium: Online Resource
    ISSN: 1662-9795
    URL: Issue
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2010
    detail.hit.zdb_id: 2073306-9
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  • 7
    Online Resource
    Online Resource
    IOP Publishing ; 2023
    In:  Materials Research Express Vol. 10, No. 5 ( 2023-05-01), p. 056510-
    In: Materials Research Express, IOP Publishing, Vol. 10, No. 5 ( 2023-05-01), p. 056510-
    Abstract: TC4 titanium alloy and AA6061 aluminum alloy are widely used in the transportation industry because of their excellent mechanical properties and lightweight. In this work, the TC4 titanium alloy was solution heat treated between 800 °C and 990 °C for 1 h, and water cooled to room temperature. The riveting and tensile tests at room temperature were conducted to evaluate the joint performance. The tensile strength and failure morphology were used to discuss the mechanical performance of joints. Solution heat treatment significantly improves the elongation, mechanical performance, and hardness of TC4 titanium alloy. Compared with the as-received material, the elongation of the treated TC4 titanium alloy is increased by 13% at the solution temperature of 900 °C, the tensile strength was added by 175 MPa at 930 °C, and the hardness was significantly increased. The optimal performance of the TC4 titanium alloy can be obtained at 930 °C. The tensile strength of the joint with the TC4 alloy solution heat treated at 930 °C is the highest of all joints. When the TC4 alloy was solution treated between 800 °C and 850 °C, the rivets were pulled from the AA6061. While at 900 °C and 930 °C, the AA6061 sheet was broken at the rivet. At 960 °C and 990 °C, the TC4 sheet was broken near the rivet. The crack size of TC4 titanium alloy gradually decreases from the rivet outward, and the crack spreads around the rivet. Severe friction can be found, which causes the peeling of the lower plate AA6061 alloy. The breaks of TC4 alloys were the plastic broken. The failure morphology of the TC4 alloy sheet is different under different solution heat treatment temperatures.
    Type of Medium: Online Resource
    ISSN: 2053-1591
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2760382-9
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  • 8
    Online Resource
    Online Resource
    Elsevier BV ; 1998
    In:  Comptes Rendus de l'Académie des Sciences - Series I - Mathematics Vol. 326, No. 4 ( 1998-2), p. 427-431
    In: Comptes Rendus de l'Académie des Sciences - Series I - Mathematics, Elsevier BV, Vol. 326, No. 4 ( 1998-2), p. 427-431
    Type of Medium: Online Resource
    ISSN: 0764-4442
    RVK:
    Language: French
    Publisher: Elsevier BV
    Publication Date: 1998
    SSG: 17,1
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  • 9
    Online Resource
    Online Resource
    Trans Tech Publications, Ltd. ; 2010
    In:  Key Engineering Materials Vol. 431-432 ( 2010-3), p. 474-478
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 431-432 ( 2010-3), p. 474-478
    Abstract: Tool geometric parameters, which are key factors to be considered in tool design, have a direct effect on tool cutting performance. Based on the diversity and complexity of geometric parameters and technological goals, we select cutting force and temperature as initial input conditions to build a comprehensive dimensionless tool geometric parameters evaluation method. According to the multilevel weight relationships between the technological goals and the basic cutting characteristics, the evaluation factors for cutting force and temperature are determined. The comprehensive evaluation method (CEM) is then applied to analyze and optimize the key parameters of a saw milling tool. As shown by the research results, the parameters obtained by the CEM prove that some tool parameters from actual production were reasonable, while others had re-optimized space. The CEM is shown to be effective and feasible. Also, the analysis results have an explicit guiding function for production practice.
    Type of Medium: Online Resource
    ISSN: 1662-9795
    URL: Issue
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2010
    detail.hit.zdb_id: 2073306-9
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  • 10
    Online Resource
    Online Resource
    Trans Tech Publications, Ltd. ; 2008
    In:  Key Engineering Materials Vol. 375-376 ( 2008-3), p. 454-458
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 375-376 ( 2008-3), p. 454-458
    Abstract: The physical simulation of high-speed cutting (HSC) is a hot research in cutting field. Dynamic physical simulation is the key technical difficulty of physical simulation. It can afford the machining process parameters quickly and efficiently, such as cutting stress, cutting temperature, tool wear etc., which have important academic and practical value. The cutting theoretical mathematical model based on the elastic-plastic mechanics and tribology was built up. The two-dimensional / three-dimensional (2D/3D) HSC dynamic physics simulation models were built up by the finite element method. The stress, thermal distribution and tool load etc. during the high speed machining (HSM) was obtained. These parameters provided key technical basis for the establishment and optimization of HSM parameters. They can save much machining experiments cost and improve the processing efficiency.
    Type of Medium: Online Resource
    ISSN: 1662-9795
    URL: Issue
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2008
    detail.hit.zdb_id: 2073306-9
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