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Identifying the real fracture hidden in rock microcrack zone by acoustic emission energy
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作者 Yuekun Xing Bingxiang Huang +6 位作者 Guangqing Zhang Binghong Li Hang Xu Xuejie Jiao Yang Yu Taisen Han jinlong chen 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2024年第6期731-746,共16页
Identifying the real fracture of rock hidden in acoustic emission(AE)source clusters(AE-depicted microcrack zone)remains challenging and crucial.Here we revealed the AE energy(representing dissipated energy)distributi... Identifying the real fracture of rock hidden in acoustic emission(AE)source clusters(AE-depicted microcrack zone)remains challenging and crucial.Here we revealed the AE energy(representing dissipated energy)distribution rule in the rock microcrack zone and proposed an AE-energy-based method for identifying the real fracture.(1)A set of fracture experiments were performed on granite using wedgeloading,and the fracture process was detected and recorded by AE.The microcrack zone associated with the energy dissipation was characterized by AE sources and energy distribution,utilizing our selfdeveloped AE analysis program(RockAE).(2)The accumulated AE energy,an index representing energy dissipation,across the AE-depicted microcrack zone followed the normal distribution model(the mean and variance relate to the real fracture path and the microcrack zone width).This result implies that the nucleation and coalescence of massive cracks(i.e.,real fracture generation process)are supposed to follow a normal distribution.(3)Then,we obtained the real fracture extension path by joining the peak positions of the AE energy normal distribution curve at different cross-sections of the microcrack zone.Consequently,we distinguished between the microcrack zone and the concealed real fracture within it.The deviation was validated as slight as 1–3 mm. 展开更多
关键词 GeoEnergy exploitation Rock fracture Fracture identification Acoustic emission AE energy analysis
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One-step spraying method to construct superhydrophobic magnesium surface with extraordinary robustness and multi-functions 被引量:5
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作者 Lingjie Li Xia Li +5 位作者 jinlong chen Lei Liu Jinglei Lei Nianbing Li Gao Liu Fusheng Pan 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2021年第2期668-675,共8页
The robust magnesium surfaces with multi-functions are highly desirable,and the simple and scalable methods to construct such surfaces are urgently indispensable.Herein,we conducted a one-step spraying method to facil... The robust magnesium surfaces with multi-functions are highly desirable,and the simple and scalable methods to construct such surfaces are urgently indispensable.Herein,we conducted a one-step spraying method to facilely fabricate the robust coating with multi-functions on magnesium alloys.The as-sprayed magnesium alloys surface is superhydrophobic with a static water contact angle(WCA)of 157.0°and a roll-off angle of 6.0°.Such surface has excellent mechanical,chemical and thermal stabilities,even undergoing various physical and chemical damages,including sand impact(10 gmin^(-1),≥20 min),water impact(2 impacts s^(-1),≥180 min),abrasion(1.00 kPa,≥25 cycles),peeling(≥2.15 kPa),high temperature(200°C,≥24 h),strong acidic/salty/basic media(p H=113)and organic-solvent immersion(ethanol and n-hexane,≥24 h),demonstrating brilliant robustness.Notably,the surface displays multi-functions of corrosion protection,anti-fouling and heat insulation,which will undoubtedly promote the much wider applications of magnesium alloys. 展开更多
关键词 Magnesium alloy Spraying method SUPERHYDROPHOBICITY ROBUSTNESS Multi-functions
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化妆品常用肤感改良粉体的性质与发展趋势 被引量:4
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作者 薛绘 杨盼盼 +3 位作者 吕旭阳 韩丹 陈金龙 蒋丽刚 《日用化学工业》 CAS 北大核心 2022年第1期77-83,共7页
随着彩妆产品的蓬勃发展,体质粉体由于可以调节化妆品铺展性、吸附性、贴肤性、质感、淡化视觉焦点,应用越来越广泛,涵盖护肤、防晒、彩妆等领域,受到越来越多美妆品牌的重视。本文首先简要介绍了硅石、滑石粉、云母粉、聚甲基丙烯酸甲... 随着彩妆产品的蓬勃发展,体质粉体由于可以调节化妆品铺展性、吸附性、贴肤性、质感、淡化视觉焦点,应用越来越广泛,涵盖护肤、防晒、彩妆等领域,受到越来越多美妆品牌的重视。本文首先简要介绍了硅石、滑石粉、云母粉、聚甲基丙烯酸甲酯、聚甲基硅倍半氧烷、硅弹性体粉、尼龙粉、聚氨酯粉及淀粉等肤感改良粉体,对以上粉体的表面形态、粒径、吸油值及肤感特点等性质进行归纳总结,并阐述肤感改良粉体的应用现状,然后对复合粉体与传统粉体的特点进行比较得知,随着市场的不断发展,复合粉体的附加性能更能满足现代化妆品在肤感、功效上越来越高的要求,最后对肤感改良粉体的发展趋势进行了预测,复合粉体会越来越精细化、针对性越来越强、使用会越来越便利,在护肤、防晒、彩妆等不同类型的产品选择肤感改良粉体时,不仅需要从粉体表面形态、粒径、吸油值、肤感特点等方面去综合考虑,多功能复合粉体未来会发挥越来越大的作用。 展开更多
关键词 肤感改良 粉体 性质 发展趋势 化妆品
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Antioxidant and Moisture-preserving Activities of Polysaccharides Obtained from Hericium erinaceus
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作者 Yuntao LI Zhifei TANG +2 位作者 Zhouwei XU jinlong chen Zuofa ZHANG 《Medicinal Plant》 CAS 2023年第2期1-4,共4页
[Objectives]The paper was to determine the physicochemical characteristics and antioxidant activity of three polysaccharide fractions(HP1,HP2 and HP3)obtained by ethanol precipitation from cold water,hot water and hot... [Objectives]The paper was to determine the physicochemical characteristics and antioxidant activity of three polysaccharide fractions(HP1,HP2 and HP3)obtained by ethanol precipitation from cold water,hot water and hot aqueous NaOH extracts of the fruiting body of Hericium erinaceus.[Methods]The chemical components,antioxidant and moisture-preserving activities of the three polysaccharides were determined.[Results]All the three polysaccharide extracts showed similar physicochemical characteristics and FT-IR spectra.HP1,which had the highest sugar content and lowest molecular weight,exhibited the best antioxidant activities against DPPH and hydroxyl radicals.HP3 exhibited the greatest ability to absorb and retain moisture.[Conclusions]These data demonstrate the potential utility of polysaccharides extracted form H.erinaceus in the cosmetics,food and pharmaceutical industries. 展开更多
关键词 Hericium erinaceus POLYSACCHARIDE Antioxidant activity Moisture-preserving activity
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殖民时期坦桑尼亚的印度裔移民群体探析 被引量:1
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作者 陈金龙 杜英 《世界民族》 CSSCI 北大核心 2023年第4期53-66,共14页
经过数世纪的经营,印度裔群体深深融入坦桑尼亚的民族大家庭,对坦桑尼亚的历史发展进程产生了深远的影响。民间和国内学界传统上将印度裔移民群体视为“中间人”,但是这种认识更多的是基于殖民时期的种族主义视角或者非洲国家独立后的... 经过数世纪的经营,印度裔群体深深融入坦桑尼亚的民族大家庭,对坦桑尼亚的历史发展进程产生了深远的影响。民间和国内学界传统上将印度裔移民群体视为“中间人”,但是这种认识更多的是基于殖民时期的种族主义视角或者非洲国家独立后的民族主义视角。对印度裔群体内部进行分析发现,移民群体依照宗教派系和种姓原则,复制了印度本土复杂的社会构成,在东非大地上形成了一幅幅马赛克群像。多元化的印度裔群体,在社会文化、经济、政治等方面为坦桑尼亚的社会变迁带来积极的影响,是坦桑尼亚社会历史发展进程的重要组成部分。 展开更多
关键词 坦桑尼亚 印度裔 移民群体 穆斯林
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