根据EN12385-4:2002、ISO10425:2003中的公称金属截面系数,结合对Diepa、Casar、ArcelorMittal、OLIVEIRA等企业资料给出部分结构钢丝绳相关数据关系研究,探析GB/T 8706—2017中的计算最小破断拉力、最小破断拉力总和、计算最小破断拉...根据EN12385-4:2002、ISO10425:2003中的公称金属截面系数,结合对Diepa、Casar、ArcelorMittal、OLIVEIRA等企业资料给出部分结构钢丝绳相关数据关系研究,探析GB/T 8706—2017中的计算最小破断拉力、最小破断拉力总和、计算最小破断拉力总和、消减后的实测破断拉力总和、计算实测破断拉力、计算实测破断拉力总和与实测部分捻制损失系数等术语释义。基于对JIS G 3525:2013(JWPA/JSA)与JIS G 3546:2012(JWPA/JSA)给出钢丝绳破断拉力计算公式分析,认为将通常所称的捻制损失系数改称捻制损失剩余系数更合理。展开更多
In this work,we report observations of three comets:38P/Stephan-Oterma,64P/Swift-Gehrels,and C/2017 M4(ATLAS),conducted with the Nanshan one-meter wide-field telescope in 2018 August and November,and 2019January.We ex...In this work,we report observations of three comets:38P/Stephan-Oterma,64P/Swift-Gehrels,and C/2017 M4(ATLAS),conducted with the Nanshan one-meter wide-field telescope in 2018 August and November,and 2019January.We extracted morphological features through image enhancement techniques and calculated the dust activity parameter,Afρ,along with dust mass loss rates and coma color indices using broadband photometric data.Our morphological analysis uncovered a spectrum of dust characteristics among the observed comets,ranging from a significant twisted structure in comet 38P/Stephan-Oterma’s coma to the regular coma envelope surrounding comet 64P/Swift-Gehrels.The Afρvalues varied between 148.8±0.3 cm for 64P/Swift-Gehrels and1118.5±6.2 cm for C/2017 M4(ATLAS)(measured within a reference aperture radius ofρ=6″),indicating a range from moderate to high activity levels.Dust mass loss rates were estimated from 328.1 kg s^(-1)for comet 64P/Swift-Gehrels to 1395.5 kg s^(-1)for comet C/2017 M4(ATLAS).The color indices of comets 38P/Stephan-Oterma and C/2017 M4(ATLAS)closely resemble the average colors of active short-period comets and active longperiod comets,respectively.In contrast,64P/Swift-Gehrels exhibits a significantly bluer hue than typical Jupiter family comets.展开更多
国际新媒体联盟(New Media Consortium,简称NMC)发布的《地平线报告(高等教育版)》已成为高等教育未来发展与革新的指南,影响着新兴技术在高等教育中的应用与发展。《2017地平线报告(高等教育版)》的发布,再一次吸引了国内外学者的眼球...国际新媒体联盟(New Media Consortium,简称NMC)发布的《地平线报告(高等教育版)》已成为高等教育未来发展与革新的指南,影响着新兴技术在高等教育中的应用与发展。《2017地平线报告(高等教育版)》的发布,再一次吸引了国内外学者的眼球。该地平线报告采用德尔菲法,预测高等教育未来5年所采用的六项关键技术、六个发展趋势、六项挑战。六项关键技术:自适应学习技术、移动学习、物联网、下一代学习管理系统、人工智能、自然用户界面。六个发展趋势:混合学习设计、协作学习方法、日益注重学习测量、重新设计学习空间、推动创新文化、深度学习方法。六项挑战:提升数字素养、整合正式学习与非正式学习、成就差异、数字公平、管理知识老化、重塑教育者角色。通过解读报告,分析了新兴技术影响高等教育的教学、学习和创新等问题,并对未来高等教育的发展做深入的讨论。展开更多
文摘根据EN12385-4:2002、ISO10425:2003中的公称金属截面系数,结合对Diepa、Casar、ArcelorMittal、OLIVEIRA等企业资料给出部分结构钢丝绳相关数据关系研究,探析GB/T 8706—2017中的计算最小破断拉力、最小破断拉力总和、计算最小破断拉力总和、消减后的实测破断拉力总和、计算实测破断拉力、计算实测破断拉力总和与实测部分捻制损失系数等术语释义。基于对JIS G 3525:2013(JWPA/JSA)与JIS G 3546:2012(JWPA/JSA)给出钢丝绳破断拉力计算公式分析,认为将通常所称的捻制损失系数改称捻制损失剩余系数更合理。
基金supported by the Natural Science Foundation of Xinjiang Uygur Autonomous Region of China(grant No.2021D01B112)Tianshan Talent Training Program through the grant 2023TSYCCX0101。
文摘In this work,we report observations of three comets:38P/Stephan-Oterma,64P/Swift-Gehrels,and C/2017 M4(ATLAS),conducted with the Nanshan one-meter wide-field telescope in 2018 August and November,and 2019January.We extracted morphological features through image enhancement techniques and calculated the dust activity parameter,Afρ,along with dust mass loss rates and coma color indices using broadband photometric data.Our morphological analysis uncovered a spectrum of dust characteristics among the observed comets,ranging from a significant twisted structure in comet 38P/Stephan-Oterma’s coma to the regular coma envelope surrounding comet 64P/Swift-Gehrels.The Afρvalues varied between 148.8±0.3 cm for 64P/Swift-Gehrels and1118.5±6.2 cm for C/2017 M4(ATLAS)(measured within a reference aperture radius ofρ=6″),indicating a range from moderate to high activity levels.Dust mass loss rates were estimated from 328.1 kg s^(-1)for comet 64P/Swift-Gehrels to 1395.5 kg s^(-1)for comet C/2017 M4(ATLAS).The color indices of comets 38P/Stephan-Oterma and C/2017 M4(ATLAS)closely resemble the average colors of active short-period comets and active longperiod comets,respectively.In contrast,64P/Swift-Gehrels exhibits a significantly bluer hue than typical Jupiter family comets.
文摘国际新媒体联盟(New Media Consortium,简称NMC)发布的《地平线报告(高等教育版)》已成为高等教育未来发展与革新的指南,影响着新兴技术在高等教育中的应用与发展。《2017地平线报告(高等教育版)》的发布,再一次吸引了国内外学者的眼球。该地平线报告采用德尔菲法,预测高等教育未来5年所采用的六项关键技术、六个发展趋势、六项挑战。六项关键技术:自适应学习技术、移动学习、物联网、下一代学习管理系统、人工智能、自然用户界面。六个发展趋势:混合学习设计、协作学习方法、日益注重学习测量、重新设计学习空间、推动创新文化、深度学习方法。六项挑战:提升数字素养、整合正式学习与非正式学习、成就差异、数字公平、管理知识老化、重塑教育者角色。通过解读报告,分析了新兴技术影响高等教育的教学、学习和创新等问题,并对未来高等教育的发展做深入的讨论。
