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A review of rockburst:Experiments,theories,and simulations

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第5期15卷 1312-1353页

作者： Manchao He Tai Cheng Yafei Qiao hongru li Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai200092China State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyBeijing100083China Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Tongji UniversityShanghai200092China

Rockburst is becoming a huge challenge for the utilization of deep underground *** efforts have been devoted to investigating the rockburst behavior and mechanism experimentally,theoretically,and *** aim of this review is to discuss the novel development and the state-of-the-art in experimental techniques,theories,and numerical approaches proposed for *** definition and classification of rockburst are first summarized with an in-depth comparison among ***,the available laboratory experimental technologies for rockburst are reviewed in terms of indirect and direct approaches,with the highlight of monitoring technologies and data analysis *** key rockburst influencing factors(*** and shape,rock types,stress state,water content,and temperature)are analyzed and discussed based on collected *** that,rockburst theories and mechanisms are discussed and evaluated,as well as the microscopic *** simulation approaches of rockburst are also summarized with the highlight of optional novel numerical *** accuracy,stability,and reliability of different experimental,theoretical and numerical approaches are also compared and assessed in each ***,a summary and some aspects of prospective research are presented.

关键词： Rockburst Experimental techniques Numerical simulation Theory Mechanism

New branched benign compounds including double antibiotic scaffolds:synthesis,simulation and adsorption for anticorrosion effect on mild steel

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Frontiers of Chemical Science and Engineering 2023年第2期17卷 167-182页

作者： Yueting Shi lingli Chen Shengtao Zhang hongru li Fang Gao College of Chemistry and Chemical Engineering Chongqing UniversityChongqing 400044China

In this study,two novel environmental benign double antibiotic norfloxacin or ciprofloxacin scaffolds included branched molecules were prepared by multi-step routes and purified by simple performance,which were used as the target compounds(TCs).Meanwhile,a single norfloxacin or ciprofloxacin skeleton based molecules were synthesized as the reference compounds(RCs).The molecular geometry optimization and material simulation computation revealed that TCs presented smaller HOMOLUMO energy gaps and larger binding energy levels on mild steel surface than *** chemical adsorption of TCs on steel surface was confirmed by X-ray photoelectron spectroscopy,which could be processed by TCs chelation with iron *** was shown that TCs could be self-adsorbed on steel surface,which was demonstrated by atomic force microscopy and scanning electron *** anticorrosion of the studied compounds for mild steel in HCl solution was investigated by electrochemistry *** results suggested that the anticorrosion efficiency could reach 95.86%(TC1)and 97.05%(TC2)at 0.050 mmol·L^(−1) based on electrochemical impedance spectroscopy,which were much better than RCs(RC1,69.23%;RC2,74.16%).The adsorption isotherms of TCs on steel were further fitted,and a deep insight on adsorption was discussed.

关键词： branched compounds floxacin scaffold mild steel anticorrosion environmentally benign

Double open mouse-like terpyridine parts based amphiphilic ionic molecules displaying strengthened chemical adsorption for anticorrosion of copper in sulfuric acid solution

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Chinese Journal of Chemical Engineering 2023年第5期57卷 233-246页

作者： Yueting Shi Junhai Zhao lingli Chen hongru li Shengtao Zhang Fang Gao College of Chemistry and Chemical Engineering Chongqing UniversityChongqing 400044China

In this study,the benign target double terpyridine parts based amphiphilic ionic molecules(AIMs 1,2)and the reference single terpyridine segment included AIMs(AIMs 3,4)were synthesized through a multi-step method,and the molecular structures were fully *** excellent anticorrosion of the target AIMs for copper surface in H_(2)SO_(4) solution was demonstrated by the electrochemistry analysis,which was more superior over those of the reference *** standard adsorption free energy changes of the target AIMs calculated by the adsorption isotherms were lower than -40 kJ·mol^(-1),suggesting an intensified chemical adsorption on metal *** molecular modeling and molecular dynamic computation of the studied AIMs were performed,demonstrating that the target AIMs exhibited lower highest occupied molecular orbital-lowest unoccupied molecular orbital energy gaps and greater adsorption energies than the reference *** chemical adsorption of the AIMs on metal surface was revealed by various spectroscopic methods including scanning electron microscopy,atomic force microscopy,Fourier transform infrared spectroscopy,attenuated total reflection infrared spectroscopy,Raman and X-ray diffraction.

关键词： Amphiphilic ionic molecule Adsorption Corrosion Electrochemistry Copper H_(2)SO_(4)solution

Enhanced adsorption of target branched compounds including antibiotic norfloxacin frameworks on mild steel surface for efficient protection: An experimental and molecular modelling study

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Chinese Journal of Chemical Engineering 2023年第8期60卷 212-227页

作者： lingli Chen Yueting Shi Sijun Xu Junle Xiong Fang Gao Shengtao Zhang hongru li College of Chemistry and Chemical Engineering Chongqing UniversityChongqing 400044China Chongqing Kunding Environmental Protection Technology Co.LtdChongqing 400044China

In this study, an approach was proposed to employ new target branched compounds(TBCs) including multiple antibiotic norfloxacin frameworks for intensified adsorption films to achieve super protection of mild steel in HCl medium. Thus, the TBCs containing bis/tri norfloxacin skeletons were synthesized by multi-step preparation route. In addition, the reference linear compound(RLC) including a single norfloxacin part was also synthesized. The chemical structures of these compounds were confirmed by various means. It was demonstrated that the TBCs could form the tough adsorption films on the surface of mild steel, which could be processed mainly through chemisorption effect. The electrochemical analysis suggested that the TBCs displayed superior corrosion inhibition performance for low carbon steel in1.0 mol·L^(-1) HCl solution over the RLC(RLC, 87.80%;TBC1, 97.63%;TBC2, 98.35%), which was further understood by the molecular modelling. The isotherm adsorption plots were employed to analyze the spontaneous adsorption process of the TBCs on low carbon steel surface, and a prominent chemisorption could be inferred by the standard Gibbs free energy changes of the adsorption.

关键词： Branched compounds Norfloxacin part Adsorption Anticorrosion Mild steel

Dynamic properties of micro-NPR material and its controlling effect on surrounding rock mass with impact disturbances

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Underground Space 2024年第2期15卷 331-352页

作者： Manchao He Jie Hu Tai Cheng Fei Deng Zhigang Tao hongru li Di Peng Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining&TechnologyBeijing 100083China Luohe Vocational Technology College Henan 462002China

A novel meta steel with negative Poisson’s ratio effect(termed as micro-NPR steel)is developed for rock support in deep underground *** possesses high strength,high ductility,and high energy absorption *** this paper,static tension and modified dynamic drop hammer tests are performed on this novel material to investigate its mechanical properties *** based on this material,a new generation of micro-NPR anchor cable is developed and applied in field tests subjected to blasting dynamic *** results of laboratory tests reveal that the ultimate elongation of micro-NPR steel under dynamic impacts is more than 30%and it is over 1.5 times that of Q235;the plastic and total energy absorption of micro-NPR are both significantly higher than that of *** test indicates the fine controlling effect of micro-NPR anchor cable on surrounding rock mass under dynamic *** force confirms that micro-NPR cables can distribute and absorb the dynamic energy uniformly around the supported rock when subjected to dynamic disturbance,avoiding local failure induced by excessive stress *** excavation compensation principle and energy-absorbing characteristics are used to explain the support ***,micro-NPR material and anchor cable can control and prevent dynamic disasters in deep underground engineering effectively.

关键词： Micro-NPR steel Energy-absorbing Drop hammer test Anchor cable Field test

Enhanced Ultraviolet-B Radiation Suppresses Magnaporthe oryzae Infection and Alleviates Its Damage to the Photosynthesis of Rice Leaves

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Phyton-International Journal of Experimental Botany 2024年第10期93卷 2613-2628页

作者： Qinghao Zhang Yijie Yang Jiong Wu hongru li Yuan li Zuran li Yongmei He College of Resources and Environment Yunnan Agricultural UniversityKunming650201China College of Horticulture and Landscape Yunnan Agricultural UniversityKunming650201China

In the present study,an indoor potting experiment was conducted to study the effects of enhanced UV-B radiation and Magnaporthe oryzae on the growth,stomatal structure,photosynthesis,and endogenous hormone contents of a traditional rice cultivar Baijiaolaojing in the Yuanyang terraces of Yunnan *** addition,the relationships between these parameters and disease indices were *** aimed to clarify the response of the photosynthetic physiology of rice under the combined stress of UV-B radiation and *** with the *** infection treatment,all the treatments,including *** infection before(MBR),simultaneously with(MSR),and after(MAR)UV-B radiation significantly increased the rice height and biomass by 4%–11%and 30%–111%,respectively,and the stomatal structure and carotenoids content of leaves,while decreasing the contents of chlorophyll a and b,by 21%–41%and 63%–73%,*** the MSR and MBR treatments significantly increased the photosynthetic rate and transpiration rate of rice *** MAR treatment weakened chlorophyll fluorescence parameters,including the actual photosystem II(PS II)photochemical efficiency,electron transport rate,photochemical quenching,and nonphotochemical quenching by 40%,39%,43%,and 24%,***,the treatments of MAR,MSR,and MBR decreased the phytohormones content and the *** disease index by 27%–62%in rice ***,the enhanced UV-B radiation contributed to suppressing the *** infection and alleviating its damage to the photosynthesis of rice *** study is valuable for the control of rice blast fungus and offers important insights into plant pathology.

关键词： Rice UV-B radiation rice blast disease hormones plant responses

Multi-fluorous-included Counter Anions-based Ionic Copolymers:Synthesis and Enhanced Hydrophobic Adsorption Films on Copper Surface for Super Protection

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Chemical Research in Chinese Universities 2023年第5期39卷 845-856页

作者： REN Weihua SHI Yueting CHEN lingli YANG Song ZHANG Shengtao liU Xiaohong REN Xiaolei li hongru College of Chemistry and Chemical Engineering Chongqing UniversityChongqing 400044P.R.China Chongqing Youth Vocational&Technical College Chongqing 400712P.R.China Chongqing Institute of Green and Intelligent Technology Chinese Academy of SciencesChongqing 400714P.R.China College of Environment and Resources Chongqing Technology and Business UniversityChongqing 401331P.R.China

Three multi-fluorous-carried anions-based ionic copolymers(ICs)including(fluorosulfonyl)imide(FSI-),(trifluorometha-nesulfonyl)imide(TFSI-)and hexafluorophosphate anions(PF6-)(IC[FSI-]),poly[1,1'-(butane-1,4-diyl)bis(3-pentyl-1H-imidazol-3-ium)bis(fluorosulfonyl)amide](IC[TFSI-]),poly{1,1'-(butane-1,4-diyl)bis(3-pentyl-1H-imidazol-3-ium)bis[(trifluoromethyl)sulfonyl]-amide}(IC[PF6-]),poly[1,1'-(butane-1,4-diyl)bis(3-pentyl-1H-imidazol-3-ium)bishexafluorophosphate]were synthesized with a simple ionic exchange method by using amphiphilic poly[1,1'-(butane-1,4-diyl)bis(3-pentyl-1H-imidazol-3-ium)bisbromide](IC[Br-])as the intermediate ionic *** chemical srutrcures of the target ICs were characterized by nuclear magnetic resonance(NMR)spectroscopy and Fourier-transform infrared spectroscopy(FTIR).It is shown that the target ICs could be spontaneously adsorbed on copper surface in N,N-dimethflormamide(DMF),and the tight adsorption films were formed on metal *** contacting angles suggest that the formed adsorption layers of target ICs on copper surface were characterized with hydrophobic ***,the target ICs-copper chemistry bonding was confirmed by various *** electrochemistry analysis showed that the target ICs adsorption layers could prevent from copper corrosion in H2SO4solution efficiently,and the maximal anticorrosion efficiency was over 95%at 0.100 g/*** particular,the target ICs showed 85%or above anticorrosion efficiency for copper at a low concentration of 0.025 g/L,which was greater than the intermediate polymer IC[Br-].In addition,an insight of mixed chemisorption and physisorption of the target ICs on metal surface was analyzed and discussed.

关键词： Hydrophobic adsorption film Ionic copolymer Multi-fluorous-included anion Copper Anticorrosion

A diluent protective organic additive electrolyte of hydrophilic hyperbranched polyester for long-life reversible aqueous zinc manganese oxide batteries

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Frontiers of Materials Science 2023年第2期17卷 65-78页

作者： Hengxin Xu Song Yang Yufeng Chen Junle Xiong Shengtao Zhang Fang Gao Zhengyong Huang hongru li College of Chemistry and Chemical Engineering Chongqing UniversityChongqing 400044China Chongqing Kunding Environmental Protection Technology Co.Ltd.Chongqing 400044China State Key Laboratory of Power Transmission Equipments and System Security and New Technology Chongqing UniversityChongqing 400044China

hydrophilic hyperbranched polyester(poly(tetramethylol acetylenediurea(TA)-CO-succinyl chloride)(PTS))was proposed to be used as an organic additive in aqueous ZnSO_(4)electrolyte to achieve a highly reversible zinc/manganese oxide *** is found that the zinc symmetric battery based on the 2.0 wt.%PTS/ZnSO_(4)electrolyte showed a long cycle stability of more than 2400 h at 1.0 mA·cm^(-2),which is much longer than that including the blank ZnSO_(4)electrolyte(140 h).Furthermore,the capacity retention of the Zn||MnO_(2)full cells employing the 2.0 wt.%PTS/ZnSO_(4)electrolyte remained 85%after 100 cycles at 0.2 A·g^(1),which is much higher than 20%capacity retention of the cell containing the blank ZnSO_(4)electrolyte,and also greater than 59.6%capacity retention of the cell including the 10.0 wt.%TA/ZnSO_(4)*** using 2.0 wt.%PTS/ZnSO_(4)electrolytes,the capacity retention of the Zn||MnO_(2)full cells even reached 65%after 2000 cycles at a higher current density of 1.0 A·g^(1).It is further demonstrated that the PTS was firmly adsorbed on the zinc anode surface to form a protective layer.

关键词： aqueous zinc-ion battery hydrophilic branched polyester Zn anode protection Zn dendrite adsorption

Excited state intramolecular proton transfer fluorescence emission of o-hydroxyphenyl-triazine derivatives

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Chinese Science Bulletin 2011年第14期56卷 1457-1460页

作者： li Haili li hongru YANG Long XU XiaoFang ZHANG ShengTao GAO Fang College of Chemistry and Chemical Engineering Chongqing University Chongqing 400044 China

o-hydroxyphenyl-triazine derivatives with formyl substituents were surveyed for the excited state intramolecular proton transfer (ESIPT).The occurrence of ESIPT was confirmed by well-separated emission bands for the d... 详细信息

关键词：激发态分子内质子转移三嗪衍生物邻羟基苯基荧光发射发射光谱低能量工具