人工智能技术的迅速发展和广泛应用,为不断变革和发展的医学教学带来了新的机遇和挑战。ChatGPT作为一种自然语言处理技术(natural language processing,NLP),具有自动化处理和生成语言的能力,正在逐渐被应用于医学教学领域。文章首先...人工智能技术的迅速发展和广泛应用,为不断变革和发展的医学教学带来了新的机遇和挑战。ChatGPT作为一种自然语言处理技术(natural language processing,NLP),具有自动化处理和生成语言的能力,正在逐渐被应用于医学教学领域。文章首先介绍了ChatGPT的概念及其应用现状,其次针对医学教育的特点和存在的问题,指出ChatGPT在医学教学中的应用前景和面临的挑战,需要在技术、数据隐私保护和教学模式等方面进行更加深入的探讨和研究。展开更多
Dioctyl sebacate(DOS)is an organic ester compound,mainly used as a low-temperature plasticizer and synthetic antirust and cold-resistant ester lubricant base oil.This study discusses the use of synthesized molybdenum ...Dioctyl sebacate(DOS)is an organic ester compound,mainly used as a low-temperature plasticizer and synthetic antirust and cold-resistant ester lubricant base oil.This study discusses the use of synthesized molybdenum disulfide/C60(MoS_(2)/C_(60))composite particles as catalysts to synthesize a new type of DOS endowed with high lubricity.This was achieved through a catalytic esterification reaction between sebacic acid and 1-octanol.After the reaction,MoS_(2)/C_(60) was dispersed in situ in this novel DOS to form a suspension(MoS_(2)/C_(60)/DOS).The tribological properties of MoS_(2)/C_(60)/DOS were examined through high-frequency reciprocating friction and wear experiments,and the friction and wear mechanisms were analyzed.The results show that MoS_(2)/C_(60)/DOS can significantly enhance the antiwear and friction reduction performance compared to commercial DOS by 91% and 95%,respectively,achieving an ultra-low friction state with an average friction coefficient of 0.006.A friction film containing elements such as Fe,O,C,Mo,and S forms on the friction surface,significantly improving the lubrication state of the friction interface and achieving low friction.展开更多
With the risk of disappearing for the rock paintings considering long-term exposure in Helan Mountain,the freeze-thaw(F-T)cycling experiments were carried out with 12-hour F-T cycling(0,10,20,30,and 40 F-T cycles)unde...With the risk of disappearing for the rock paintings considering long-term exposure in Helan Mountain,the freeze-thaw(F-T)cycling experiments were carried out with 12-hour F-T cycling(0,10,20,30,and 40 F-T cycles)under five kinds of confining pressures(5,10,20,30,and 40 MPa).The acoustic emission(AE)detect technology was used to reveal the rock fracturing characteristics during the triaxial compression test whole process.The stress-strain relation changes along with different confining pressures and F-T cycles.Peak stress and residual stress changes along with different confining pressures and damages,and the variation of axial stress-AE ringing counts-time changes along with different confining pressures and F-T cycles.The damage variable with AE parameter under F-T and force coupling was defined for the first time,and the damages model was established.The experimental results show that the F-T cycles lead to the decrease of rock strength and the gradual transformation of compression failure mode from brittleness to plasticity.The confining pressure provides a certain ability to resist deformation and inhibit crack growth for rock samples after F-T cycles.The temporal and spatial evolution law of AE counts well corresponds to the loading and failure process of the rock samples.The AE 3D positioning technology can accurately capture the development position and direction of internal cracks and pores of rock,and the failure form is conical shear failure.The established damage model has a better fittingness between the theoretical calculation results and the test results,and is reasonable to be used in the future for protection of Helan Mountain rock painting.展开更多
文摘人工智能技术的迅速发展和广泛应用,为不断变革和发展的医学教学带来了新的机遇和挑战。ChatGPT作为一种自然语言处理技术(natural language processing,NLP),具有自动化处理和生成语言的能力,正在逐渐被应用于医学教学领域。文章首先介绍了ChatGPT的概念及其应用现状,其次针对医学教育的特点和存在的问题,指出ChatGPT在医学教学中的应用前景和面临的挑战,需要在技术、数据隐私保护和教学模式等方面进行更加深入的探讨和研究。
基金The financial support from the National Natural Science Foundation of China(52075141,52075144)is gratefully acknowledged.
文摘Dioctyl sebacate(DOS)is an organic ester compound,mainly used as a low-temperature plasticizer and synthetic antirust and cold-resistant ester lubricant base oil.This study discusses the use of synthesized molybdenum disulfide/C60(MoS_(2)/C_(60))composite particles as catalysts to synthesize a new type of DOS endowed with high lubricity.This was achieved through a catalytic esterification reaction between sebacic acid and 1-octanol.After the reaction,MoS_(2)/C_(60) was dispersed in situ in this novel DOS to form a suspension(MoS_(2)/C_(60)/DOS).The tribological properties of MoS_(2)/C_(60)/DOS were examined through high-frequency reciprocating friction and wear experiments,and the friction and wear mechanisms were analyzed.The results show that MoS_(2)/C_(60)/DOS can significantly enhance the antiwear and friction reduction performance compared to commercial DOS by 91% and 95%,respectively,achieving an ultra-low friction state with an average friction coefficient of 0.006.A friction film containing elements such as Fe,O,C,Mo,and S forms on the friction surface,significantly improving the lubrication state of the friction interface and achieving low friction.
基金Funded by the National Natural Science Foundation of China(Nos.11662015,51768059 and 51468053)。
文摘With the risk of disappearing for the rock paintings considering long-term exposure in Helan Mountain,the freeze-thaw(F-T)cycling experiments were carried out with 12-hour F-T cycling(0,10,20,30,and 40 F-T cycles)under five kinds of confining pressures(5,10,20,30,and 40 MPa).The acoustic emission(AE)detect technology was used to reveal the rock fracturing characteristics during the triaxial compression test whole process.The stress-strain relation changes along with different confining pressures and F-T cycles.Peak stress and residual stress changes along with different confining pressures and damages,and the variation of axial stress-AE ringing counts-time changes along with different confining pressures and F-T cycles.The damage variable with AE parameter under F-T and force coupling was defined for the first time,and the damages model was established.The experimental results show that the F-T cycles lead to the decrease of rock strength and the gradual transformation of compression failure mode from brittleness to plasticity.The confining pressure provides a certain ability to resist deformation and inhibit crack growth for rock samples after F-T cycles.The temporal and spatial evolution law of AE counts well corresponds to the loading and failure process of the rock samples.The AE 3D positioning technology can accurately capture the development position and direction of internal cracks and pores of rock,and the failure form is conical shear failure.The established damage model has a better fittingness between the theoretical calculation results and the test results,and is reasonable to be used in the future for protection of Helan Mountain rock painting.
