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Mechanism of thermoviscoelasticity driven solid-liquid interface reducing friction for polymer alloy coating

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Friction 2023年第9期11卷 1606-1623页

作者： Sheng TAN yimin luo Junhua YANG Wei WANG Xia LI Baoguang JIA Zhuangzhu luo Guangan ZHANG School of Materials Sun Yat-sen UniversityShenzhen 518107China The 14th Research Institute of China Electronics Technology Group Corporation Nanjing 210039China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

High-temperature ablation is a common failure phenomenon that limits the service life of the transmission parts on heavy-duty machines used in heavy load,high temperature,high shock conditions due to in-sufficient supply of lubricating oil and *** self-lubricating coatings prepared by inorganic,organic or organic-inorganic hybrid methods are prone to be oxidated at high temperatures to lose their friction reducing function,so that it is difficult to meet the engineering requirements of high-temperature *** design viscoelastic polymer coatings by a high-temperature self-lubricating and wear-resistant ***(PTFE,T_(m)=329℃)and polyphenylene sulfide(PPS,T_(g)=84℃,T_(m)=283℃)are used to prepare a PTFE/PPS polymer alloy *** the temperature increases from 25 to 300℃,the PTFE/PPS coating softens from glass state to viscoelastic state and viscous flow state,which is owing to the thermodynamic transformation characteristic of the PPS *** the friction coefficient(μ)decreased from 0.096 to 0.042 with the increasing of temperature from 25 to 300℃.The mechanism of mechanical deformation and surface morphology evolution for the PTFE/PPS coating under the multi-field coupling action of temperature(T),temperature–centrifugal force(T–F_(ω)),temperature–centrifugal force–shearing force(T–F_(ω)–F_(τ))were *** physical model of“thermoviscoelasticity driven solid–liquid interface reducing friction”is proposed to clarify the self-lubricating mechanism determined by the high-temperature viscoelastic properties of *** high-temperature adjusts the viscosity(η)of the coating,increases interface slipping and intensifies shear deformation(τ),reducing the friction *** result is expected to provide a new idea for designing anti-ablation coatings served in high temperature friction and wear conditions.

关键词： self-lubricating polymer coating viscoelastic state solid-liquid interface friction reduction hightemperature tribology

Coalbursts in China: Theory, practice and management

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第1期16卷 1-25页

作者： Yishan Pan yimin Song Hao luo Yonghui Xiao Institute of Disaster Rock Mechanics Liaoning UniversityShenyang110036China School of Civil Engineering North China University of TechnologyBeijing100144China College of Computer Science Liaoning UniversityShenyang110036China School of Physics Liaoning UniversityShenyang110036China

Coalburst is one of the most serious disasters that threaten the safe production of coal mines, and this disaster is particularly serious in China. This paper presents an overview of coalbursts in China since 1980s. From the "stress and energy" and "regional and local" perspectives, the achievements in the theory, practice and management of coalbursts in China are systematically summarized. A theoretical system of coalbursts has been formed to reveal the deformational behavior of coalbursts and explain the mechanism of coalbursts. The occurrence conditions of coalbursts are put forward and the critical stress is obtained. The stress index method for risk evaluation of coalbursts before mining is proposed, and the deformation localization prediction method of coalbursts is put forward. The relationship between energy release and absorption in the process of coalbursts is found, and the prevention and control methods of coalbursts, including the regional method, the local method and support, are presented. The safety evaluation index of coalburst prevention and control is put forward. The integrated prevention and control method for coal and gas outbursts is proposed. The prevention and control technology and equipment of coalbursts have also been developed. Amongst them, the distribution law of the critical stress in China coalburst mines is discovered. The technology and equipment for monitoring, prevention and control of coalbursts, as well as for integrated prevention and control of combined coalbursts and other disasters, have been developed. The energy-absorbing and coalburst-preventing support technology for roadways is invented, and key engineering parameters of coalburst prevention and control are pointed out. In China, coalburst prevention and control laws and standards have been developed. Technical standards for coalbursts are formulated, statute and regulations for coal mines are established, and regulatory documents are promoted.

关键词： Coalbursts Rockbursts Dynamic disaster Energy-absorbing support Monitoring and early warning

INFLUENCE OF ORDINARY ACCELERATORS ON HYDRATION OF BELITE CEMENT

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Journal of Wuhan University of Technology(Materials Science) 1999年第4期14卷 33-39页

作者： GUO Suihua FENG Peizhi ZENG yimin luo ShiyongChina Building Materials Academy Wuhan University of TechnologyUniversity of Technology and Science Beijing China Building Materials Academy China Cement and Concrete Sci. Institute China Building Materilas Academy Beijing 100024 China Wuhan University of Technology China Univ. of Technol. and Sci. Beijing China

The study revealed that ordinary acceler- ators for portlandcement also improves early strength of Belite cement remarkably, butone serious defect exists Which lead to a high strength reduction atthe age of 28 days. The paper analyzes the action mechanism ofordinary accelerators on Belite cement. It shows that theseaccelerators can not accelerate the hydration of β-C_2S directly.

关键词： Belite cement hydration accelerators

Enhancing the electrocatalytic performance of nitrate reduction to ammonia by in-situ nitrogen leaching

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Chinese Chemical Letters 2024年第2期35卷 564-569页

作者： Mimi Fu Yini Mao Hua Wang Wei luo yimin Jiang Wei Shen Ming Li Rongxing He College of Chemistry and Chemical Engineering Southwest UniversityChongqing 400715China

Electrochemical nitrate reduction reaction (NITRR) is regarded as a “two birds-one stone” method for the treatment of nitrate contaminant in polluted water and the synthesis of valuable ammonia, which is retarded by the lack of highly reactive and selective electrocatalysts .Herein, for the first time, nickel foam supported Co_(4) N was designed as a high-performance NITRR catalyst by an in-situ nonmetal leaching-induced *** the optimal potential, the Co_(4) N/NF catalyst achieves ultra-high Faraday efficiency and NH_(3) selectivity of 95.4% and 99.4%, *** situ X-ray absorption spectroscopy (XAS), together with other experiments powerfully reveal that the nitrogen vacancies produced by nitrogen leaching are stable and play a key role in boosting nitrate reduction to *** calculations confirm that Co_(4) N with abundant nitrogen vacancies can optimize the adsorption energies of NO_(3)^(-) and intermediates, lower the free energy (Δ G ) of the potential-determining step (*NH_(3) to NH_(3) ) and inhibit the formation of N-containing *** addition, we also conclude that the nitrogen vacancies can stabilize the adsorbed hydrogen, making H_(2) quite difficult to produce, and lowering ΔG from *NO to *NOH, which facilitates the selective reduction of *** study reveals significant insights about the in-situ nonmetal leaching to enhance the NITRR activity.

关键词： Co4N Nitrate reduction In-situ nonmetal leaching Nitrogen vacancy Mechanism

岸与圈:一个天文学的隐喻——沈从文的《边城》与安德森的《林中之死》

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外国文学研究 2005年第3期27卷 143-149页

作者：罗益民西南师范大学外国语学院

圆形意象母题是中西文学共同关注的话题,成为历朝历代文学家描写的焦点。西方尤其以传统宇宙论的天文学隐喻解构人们关于永恒、完美、理想的彼岸世界等意义概念,东方则以类似的思维方式触及这一美学话题。《边城》和《林中之死》几乎同... 详细信息

圆形意象母题是中西文学共同关注的话题,成为历朝历代文学家描写的焦点。西方尤其以传统宇宙论的天文学隐喻解构人们关于永恒、完美、理想的彼岸世界等意义概念,东方则以类似的思维方式触及这一美学话题。《边城》和《林中之死》几乎同时发表,写于不同的国度。但从二者描写的主题意象来看,都是对西方传统天文学的一个隐喻。前者以“岸”为前景,后者以“圈”为象征,所说的却都是圆形运动。它象征着人类行程的运动模式,表现出的是人的精神追求模式。

关键词：《林中之死》《边城》天文学隐喻安德森沈从文中西文学内容提要彼岸世界思维方式主题意象运动模式精神追求文学家宇宙论话题圆形描写传统西方象征母题解构

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《随园集外诗》考辨

文献 2007年第3期 69-79页

作者：罗以民浙江省社科院历史所

笔者近见蒋敦复编《随园集外诗》系浙江图书馆藏书，扉页有“64年清点”“84年清点”章，上海大东书局民国十五年（1926）第4次印刷（初版为民国九年）之石印本。全书分2册，共四卷，130页，计诗约200首。书前仅有蒋敦复序一篇，照录如下：

关键词：考辨诗图书馆藏书石印本民国

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海德格尔艺术接受论的三个层次

中国文学研究 2022年第1期 27-33页

作者：罗益民宜春学院文学与新闻传播学院江西宜春336000

海德格尔的《艺术作品的本源》专门探讨了艺术接受问题,虽未明言但在事实上阐发出了艺术接受的三个层次:艺术体验,艺术之保存与本有(Ereignis)之用(Brauch)。这三个层次分别对应于符合论真理、存在者真理与存在的真理,并且构成了一条通... 详细信息

海德格尔的《艺术作品的本源》专门探讨了艺术接受问题,虽未明言但在事实上阐发出了艺术接受的三个层次:艺术体验,艺术之保存与本有(Ereignis)之用(Brauch)。这三个层次分别对应于符合论真理、存在者真理与存在的真理,并且构成了一条通向存有之遮蔽的下行道路,从而区别于西方传统中艺术接受或审美的上升之路。

关键词：海德格尔艺术接受艺术作品真理下行

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莎士比亚十四行诗的拓扑学爱情观

国外文学 2011年第2期 73-80页

作者：罗益民西南大学外国语学院

莎士比亚十四行诗表达的爱情观体现在三个方面:真、善、美。这三个方面充分体现出莎士比亚审美方面的柏拉图观念。诗人综合运用彼特拉克、伊拉斯谟等人的传统,对其进行了辩证的继承和扬弃。在具体的操作手法上,莎士比亚通过拓扑学空间... 详细信息

莎士比亚十四行诗表达的爱情观体现在三个方面:真、善、美。这三个方面充分体现出莎士比亚审美方面的柏拉图观念。诗人综合运用彼特拉克、伊拉斯谟等人的传统,对其进行了辩证的继承和扬弃。在具体的操作手法上,莎士比亚通过拓扑学空间展拓的手段加以实施,形成了莎士比亚艺术审美世界独具风采的大花园,为人类精神宝库留下了可贵的遗产。

关键词：莎士比亚十四行诗拓扑学爱情观

管萧婚曲声中的流浪者——柯尔律治《古舟子咏》中的基督教主题

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国外文学 2006年第3期 31-43页

作者：罗益民西南师范大学英语系

在纷繁复杂的版本构成史和批评阅读史背景之下,评论家从宗教、伦理、心理分析、传记学、哲学、美学和政治学等角度,对《古舟子咏》进行了精彩、动人的论述。但字里行间确实存在的一个深刻而明显的寓意,却是评论文字未曾阐发的,即人是永... 详细信息

在纷繁复杂的版本构成史和批评阅读史背景之下,评论家从宗教、伦理、心理分析、传记学、哲学、美学和政治学等角度,对《古舟子咏》进行了精彩、动人的论述。但字里行间确实存在的一个深刻而明显的寓意,却是评论文字未曾阐发的,即人是永远的流浪者,绝对意义上从原罪的阴影和桎梏中走出来是不可能的。人须努力回报上帝仁慈的爱,在不断的忏悔中追求救赎。这才是《古舟子咏》阐释的人与上帝真实的辩证关系。

关键词：管萧婚曲流浪者柯尔律治《古舟子咏》基督宗教主题