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Mountain tunnel under earthquake force:A review of possible causes of damages and restoration methods

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第2期12卷 414-426页

作者： xuepeng zhang Yujing Jiang Kazuhiko Maegawa State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and TechnologyQingdao266590China School of Engineering Nagasaki UniversityNagasaki8528521Japan Nippon Expressway Research Institute Company Limited Tokyo194-8508Japan

Accurate seismic assessment and proper aseismic design of underground structures require a comprehensive understanding of seismic performance and response of underground structures under earthquake *** order to understand the seismic behavior of tunnels during an earthquake,a wide collection of case histories has been reviewed from the available literature with respect to damage classification,to discuss the possible causes of damage,such as earthquake parameters,structural form and geological *** addition,a case of Tawarayama tunnel subjected to the 2016 Kumamoto earthquake is *** on the possible influence factors aims at improving the performancebased aseismic design of ***,restoration design criterion and methods are presented taking Tawarayama tunnel as an example.

关键词： Mountain tunnel Seismic damage Influence factor Restoration method

Analysis and prediction of global vegetation dynamics:past variations and future perspectives

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Journal of Forestry Research 2023年第2期34卷 317-332页

作者： Guangchao Li Wei Chen Liqiang Mu xuepeng zhang Pengshuai Bi Zhe Wang Zhen Yang College of Geoscience and Surveying Engineering China University of Mining and TechnologyBeijing 100083People’s Republic of China School of Forestry Northeast Forestry UniversityHarbin 150040People’s Republic of China College of Information Science and Engineering Henan University of TechnologyZhengzhou 450001People’s Republic of China

Spatiotemporal dynamic vegetation changes affect global climate change,energy balances and the hydrological *** these dynamics over a long time series is important for the study and analysis of global environmental *** on leaf area index(LAI),climate,and radiation flux data of past and future scenarios,this study looked at historical dynamic changes in global vegetation LAI,and proposed a coupled multiple linear regression and improved gray model(CMLRIGM)to predict future global *** results show that CMLRIGM predictions are more accurate than results predicted by the multiple linear regression(MLR)model or the improved gray model(IGM)*** coupled model can effectively resolve the problem posed by the underestimation of annual average of global vegetation LAI predicted by MLR and the overestimate predicted by *** 1981 to 2018,the annual average of LAI in most areas covered by global vegetation(71.4%)showed an increase with a growth rate of 0.0028 a-1;of this area,significant increases occurred in 34.42%of the total *** 2016 to 2060,the CMLRIGM model has predicted that the annual average global vegetation LAI will increase,accounting for approximately 68.5%of the global vegetation coverage,with a growth rate of 0.004 *** growth rate will increase in the future scenario,and it may be related to the driving factors of the high emission scenario used in this *** research may provide a basis for simulating spatiotemporal dynamic changes in global vegetation conditions over a long time series.

关键词： Vegetation dynamics LAI CMLRIGM Prediction Climate Radiation

Cobalt porphyrins supported on carbon nanotubes as model catalysts of metal-N_(4)/C sites for oxygen electrocatalysis

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Journal of Energy Chemistry 2021年第2期30卷 77-81,I0003页

作者： Haonan Qin Yanzhi Wang Bin Wang Xiaoguang Duan Haitao Lei xuepeng zhang Haoquan Zheng Wei zhang Rui Cao Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringShaanxi Normal UniversityXi'an 710119.ShaanxiChina School of Chemical Engineering and Advanced Materials The University of AdelaideAdelaide 5005SAAustralid

Transition-metal based M-N_4/C catalysts are appealing for electrocatalytic oxygen reduction reaction(ORR) and oxygen evolution reaction(OER). Employing model catalysts, which have well-defined molecular structures and coordination environments, to investigate electrocatalytic performance of M-N_4/C sites for ORR and OER is of fundamental significance. Herein, we reported the use of Co tetra(phenyl)porphyrin 1 and Co tetra(pentafluorophenyl)porphyrin 2 as models to probe the role of Co-N_4/C sites for oxygen electrocatalysis. We showed that Co porphyrin 1 is more efficient than its structural analogue 2 for oxygen electrocatalysis in alkaline aqueous solutions, indicating that the electronrich Co-N_4/C site is more favored when noncovalently adsorbed on carbon supports. This work inspires rational design of reaction-oriented catalysts for sustainable energy storage and conversion technologies.

关键词： Molecular electrocatalysis Model catalyst Oxygen evolution reaction Oxygen reduction reaction Porphyrin

Effects of Waxy Maize Relay Intercropping and Residue Retention on Rhizosphere Microbial Communities and Vegetable Yield in a Continuous Cropping System

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Pedosphere 2018年第1期28卷 84-93页

作者： zhang xuepeng NING Tangyuan HAN Huifang SUN Tao LI Geng LI Zengjia Rattan LAL State Key Laboratory of Crop Biology Shandong Key Laboratory of Crop Biology National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources Shandong Agricultural University Carbon Management and Sequestration Center College of Food Agricultural and Environmental Sciences The Ohio State University

Intercropping and residue retention contribute to high yield and quality of crops. However, their coupled effects on rhizospheric microbial communities under a continuous vegetable cropping system have not been adequately addressed. The objective of the present study was to assess the effects on soil microbial community and yields of waxy maize（Zea mays L.） intercropped with or without residue retention in a continuous broccoli（Brassica oleracea L.） cropping system, i.e., relay intercropping of broccoli and waxy maize（B/M-B）, relay intercropping of broccoli and waxy maize with residue retention（B/MR-B）, and broccoli monoculture（B-B）. The biomass yields of spring and autumn vegetables in B/MR-B were 16.3%–32.5% and 30.1%–46.1% higher than those of B-B,respectively. Autumn vegetable economic yields of B/MR-B were 28.2%–40.3% higher than B-B. The average well color development followed the order： B/MR-B ＆gt; B/M-B ＆gt; B-B. The Shannon index, Simpson index, and Mc Intosh index were higher in B/MR-B than under monoculture. A principal component analysis showed that microbial communities of B/MR-B soils differed from those of B/M-B and B-B soils. Carbon（C） sources utilized by the rhizosphere microorganisms were mainly carbohydrates, carboxylic acids, amino acids, and polymers; however, the C sources for the soil microbial community differed between intercropping and monoculture. The communities from B/MR-B preferred amino acids and polymers. Available nitrogen（N）, potassium（K）, and phosphorus（P） had an obvious impact on soil microbial community. Additionally, the C source utilization by microorganisms was significantly affected by p H and available K and P. Cropping system diversification through relay intercropping and residue retention effectively improved the functional diversity of the soil microbial communities and increased the yields of vegetables.

关键词： average well color development carbon source utilization continuous cropping obstacles microbial community diversity monoculture

Kinetic and thermodynamic control of tetraphenylethene aggregation-induced emission behaviors

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Aggregate

Aggregate 2022年第4期3卷 108-113页

作者： Xiancheng Nie Wenhuan Huang Dingcheng Zhou Tao Wang Xiao Wang Biao Chen xuepeng zhang Guoqing zhang Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefeiChina

Many aggregation-induced emission(AIE)systems exhibit broad and structureless luminescence emission spectra resembling the Gaussian distribution,which is likely due to kinetically locked molecular conformers in the condensed *** verify the hypothesis,a series of tetraphenylethene(TPE)derivatives are synthesized and characterized as aqueous nanoparticle *** is found that the unsubstituted TPE exhibits reduced fluorescence intensity accompanied by a blueshift of the emission maximum,after the temperature of the aqueous suspension is elevated and cooled to room temperature *** a naphthalimide-substituted TPE compound,thermal treatment of the AIE aqueous suspension results in complete,irreversible aggregation-caused quenching(ACQ)of fluorescence,which can be restored by a redissolving-precipitation process of thermally treated *** phenomenon is ascribed as a relative population shift of a kinetic AIE(k-AIE)state to a thermodynamic AIE(t-AIE)or ACQ state,evidenced by differential scanning calorimetry,dynamic light scattering,and scanning electron *** phenomenon may be universal for many other AIE systems and could be explored as stimuli-responsive materials.

关键词： aggregation-induced emission kinetic phase change thermodynamic

Molecular Thermal Motion Modulated Room-Temperature Phosphorescence for Multilevel Encryption

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Research 2022年第4期2022卷 597-607页

作者： Jiaqiang Zhao Guojuan Yan Wei Wang Shishi Shao Binfang Yuan Yan Jie Li xuepeng zhang Cheng Zhi Huang Peng Fei Gao Key Laboratory of Luminescence Analysis and Molecular Sensing(Southwest University) Ministry of EducationCollege of Pharmaceutical SciencesSouthwest UniversityChongqing 400715China Chongqing Key Laboratory of Inorganic Special Functional Materials Collge of Chemistry and Chemical EngineeringYangtze Normal UniversityFulingChongqing 408100China Hefei National Laboratory for Physical Science at the Microscale University of Science and Technology of China96 Jinzhai RdHefeiAnhui 230026China

The stimulus-responsive room-temperature phosphorescence(RTP)materials have become an increasingly significant topic in the fields of bioimaging,sensing,and ***,this kind of materials is scarce to date,especially for the ones with delicate stimulus-responsive ***,a universal strategy for multilevel thermal erasure of RTP via chromatographic separation of host-guest doping RTP systems is *** tunable host-guest systems,matrix materials,heating temperature,and time are demonstrated to allow precise six-level data encryption,QR code encryption,and thermochromic phosphorescence *** study reveals that the thermal-responsive property might be attributed to molecular thermal motion and the separation effect of the silica gel,which provides expanded applications of host-guest RTP materials such as cold chain break *** work offers a simple yet universal way to construct advanced responsive RTP materials.

关键词： RTP separation precise

采煤工作面动压影响巷道水力压裂切顶卸压技术研究

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能源与节能 2025年第1期 146-148页

作者：张学鹏灵石县应急管理综合行政执法大队山西晋中031300

为降低采面采动压力影响,以及控制动压巷道围岩的变形,以3205工作面胶运巷为工程研究对象,提出通过水力压裂切顶卸压降低采面动压,以提高胶运巷围岩的稳定性。结合3205工作面胶运巷现场地质条件、顶板岩层结构及厚度等,设计了水力压裂... 详细信息

为降低采面采动压力影响,以及控制动压巷道围岩的变形,以3205工作面胶运巷为工程研究对象,提出通过水力压裂切顶卸压降低采面动压,以提高胶运巷围岩的稳定性。结合3205工作面胶运巷现场地质条件、顶板岩层结构及厚度等,设计了水力压裂卸压的布置方案,并分析了工程应用效果。现场应用后,3205工作面胶运巷顶底板、两帮变形量分别为408、 77 mm,变形量较未压裂区降幅分别为61.5%、 73.2%,胶运巷围岩始终保持稳定,巷道断面基本可满足使用需求。

关键词：动压巷道围岩控制水力压裂卸压

A DFT Investigation of Charge Transfer States in Intermolecular TADF Process

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A DFT Investigation of Charge Transfer States in Intermolecu...

Revisiting an ancient inorganic aggregation-induced emission system:An enlightenment to clusteroluminescence

第十三届全国量子化学会议

作者： xuepeng zhang School of Chemistry Sun Yat-sen University

Thermally-Actvated Delayed Fluorescence（TADF） molecules have small energy difference between S1 and T1 states, which allow them to demonstrate a delayed ISC and reverse ISC process and the subsequent ascending time scale of fluorescence. Two respective experimental works were published using Donor-Acceptor couple molecules. Further theoretical calculations are needed to elucidate their intrinsic manners.B3LYP/6-31G*（D3（BJ）） were used to optimize geometries. TD results were obtained with B3LYP/6-311G*, or ωB97XD/6-311G*, or OPT-ωB97XD/6-311G* in both gas and liquid phase（Epson=3.0）. The optimized omega values in liquid phase are much smaller than those in gas phase, which could be explained by the introducing of omega in range-separation functional. The results computed by PCM-SCRF//OPT-ωB97XD/6-311G* show that both the S1 and T1 states are CT states, in which the hole or electron distribution is located a t respective donor or acceptor molecule. The PCM-SCRF//OPT-ωB97XD/6-311G* provides best description in ωB97XD-used entries and has similar data estimation with PCM-SCRF//B3LYP/6-311G*, which provides the best description of HOMO-LUMO energies and S1/T1 levels when compared with experimental values. The results computed by either PCM-SCRF//OPT-ωB97XD/6-311G* or PCM-SCRF//B3LYP/6-311G* demonstrate a tiny energy difference between S1 and T1 levels, which confirms the TADF character of the two coupled molecules.

关键词： TADF TDDFT Omega ISC

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Aggregate

Aggregate 2021年第2期2卷 127-135页

作者： Zheng Zhao Zaiyu Wang Javad Tavakoli Guogang Shan Jianyu zhang Chen Peng Yu Xiong xuepeng zhang Tsz Shing Cheung Youhong Tang Bolong Huang Zhaoxun Yu Jacky W.Y.Lam Ben Zhong Tang Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction and Institute for Advanced StudyThe Hong Kong University of Science and TechnologyClear Water BayKowloonHong Kong SARChina School of Chemistry and Chemical Engineering Southeast UniversityNanjingChina Centre for Health Technologies School of Biomedical EngineeringUniversity of Technology SydneySydneyNew South WalesAustralia HKUST Shenzhen Research Institute ShenzhenGuangdongChina College of Science and Engineering Flinders UniversityAdelaideSouth AustraliaAustralia Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong SARChina Micro-X Ltd TonsleySouth AustraliaAustralia Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional MaterialsGuangdong-Hong Kong-Macao China

Organic and inorganic clusteroluminescence have attracted great attention while the underlying mechanisms is still not well ***,we employed a series of ancient inorganic complexes platinocyanides with aggregation-induced emission property to elucidate the mechanism of clusteroluminescence including how does the chromophore form and how does the solid structures influence the luminescence *** results indicate that the isolated platinocyanide cannot work as a chromophore to emit visible light,while their clusterization at aggregate state can trigger the d-orbitals coupling of the platinum atoms to facilitate the electron exchange and delocalization to form a new chromophore to emit visible ***,the counter ions and H2O ligands help to rigidify the three-dimensional network structure of the platinocyanides to suppress the excited state nonradiative decay,resulting in the high quantum yield of up to 96%.This work fundamentally helps understanding both the organic and inorganic clusteroluminescence phenomenon.

关键词： aggregation-induced emission clusteroluminescence radioluminescence