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Interface bond degradation and damage characteristics of full-length grouted rock bolt in tunnels with high temperature

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第10期15卷 2639-2657页

作者： Yunpeng Hu Mingming Zheng Wenkai feng Jianjun Tong Yicheng Wang Qiling Wang kan Liu Longzhen Ye State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu610059China Key Laboratory of Geohazard Prevention of Hilly Mountains Ministry of Land and Resources(Fujian Key Laboratory of Geohazard Prevention)Fuzhou350116China School of Civil Engineering Southwest Jiaotong UniversityChengdu610031China College of Civil Engineering Tongji UniversityShanghai200092China

Full-length grouted bolts play a crucial role in geotechnical engineering thanks to their excellent ***,few studies have been concerned with the degrading performance of grouted rock bolts caused by extensive and continuous heat conduction from surrounding rocks in high-geothermal tunnels buried more than 100 m(temperature from 28C to 100C).To investigate the damage mechanism,we examined the time-varying behaviors of grouted rock bolts in both constant and variable temperature curing environments and their damage due to the coupling effects of high temperature and humidity through mechanical and micro-feature tests,including uniaxial compression test,pull-out test,computed tomography(CT)scans,X-ray diffraction(XRD)test,thermogravimetric analysis(TGA),etc.,and further analyzed the relationship between grout properties and anchorage *** order to facilitate a rapid assessment and control of the anchorage performance of anchors in different conditions,results of the interface bond degradation tests were correlated to environment parameters based on the damage model of interfacial bond stress ***,a thermal hazard classification criterion for anchorage design in high-geothermal tunnels was *** on the reported results,although high temperature accelerated the early-stage hydration reaction of grouting materials,it affected the distribution and quantity of hydration products by inhibiting hydration degree,thus causing mechanical damage to the anchorage *** was a significant positive correlation between the strength of the grouting material and the anchoring *** by the changes in grout properties,three failure patterns of rock bolts typically *** a hot-wet curing regime results in less reduction in anchorage force compared to the hot-dry curing *** findings of this study would contribute to the design and investigations of grouted rock bolts in high-geothermal tunnels.

关键词： High-geothermal tunnels Anchoring structure Coupling effect of temperature and humidity Bond degradation Interfacial damage mechanism

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Dual-property blue and red emission carbon dots for Fe(Ⅲ)ions detection and cellular imaging

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Rare Metals 2021年第7期40卷 1957-1965页

作者： Yin-Long Xu rui-Xue Mo Cai-Yu Qi Zeng Ren Xiu-Zhi Jia Zi-Gui kan Cao-Long Li Fei Wang Key Laboratory of Biomedical Functional Materials School of Basic ScienceChina Pharmaceutical UniversityNanjing 211198China Tibetan Medicine Research Institute Tibetan Traditional Medical CollegeLasa 850000China School of Basic Medical Science Harbin Medical UniversityHarbin 150081China

The excitation wavelength-dependent and-independent emissions are two crucial fluorescent properties of carbon dots(CDs).However,CDs reported till date exhibit only one of these properties,which limits their practical ***,dual-property carbon dots(DCDs)with both the excitation wavelength-dependent and-independent emissions were synthesized via a facile onestep solvothermal method using 4-(2-pyridylazo)-resorcinol as the carbon *** multi-functional applications of the resulting DCDs were also *** asprepared DCDs exhibited not only excellent monodispersity,high photostability,and storage stability,but also low toxicity,good biocompatibility,and cellular bioimaging *** addition,the DCDs exhibited excitation-dependent emission photoluminescence under low excitation *** DCDs exhibited good Fe3+detection by quenching the blue emission fluorescence and showed a relatively low Fe3+detection limit of 0.067 lmol·L-1 based on three times signal-to-noise criteria(R2=0.99).Furthermore,the DCDs showed excitation-independent emission at low excitation wavelengths and exhibited red emission at about 598 nm to avoid damage to the *** results demonstrate the excellent bioimaging properties of the *** to their dual PL properties,the as-prepared DCDs exhibited multi-functional applications:Fe3+detection and A549 cell *** results will be helpful in developing novel CDs for applications in various fields.

关键词： Carbon dots Solvothermal Dual properties Fe3+ions detection Bioimaging

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Characterization of progression-related alternative splicing events in testicular germ cell tumors

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Asian Journal of Andrology 2021年第3期23卷 259-265页

作者： Chuan-Jie Zhang Zong-Tai Li kan-Jie Shen Lu Chen Dan-feng Xu Yi Gao Department of Urinary Surgery Ruijin HospitalShanghai Jiaotong University School of MedicineShanghai 200025China Department of Medical Oncology Gaozhou People's HospitalGaozhou 525200China First Clinical Medical College of Nanjing Medical University Nanjing 210000China

Accumulating evidence supports the significance of aberrant alternative splicing(AS)events in cancer;however,genome-wide profiling of progression-free survival(PFS)-related AS events in testicular germ cell tumors(TGCT)has not been ***,we analyzed high-throughput RNA-sequencing data and percent-spliced-in values for 150 patients with *** univariate and multivariate Cox regression analysis and a least absolute shrinkage and selection operator method,we identified the top 15 AS events most closely associated with disease progression.A risk-associated AS score(ASS)for the 15 AS events was calculated for each ***,pathological stage,and T stage were significantly associated with disease progression by univariate analysis,but only ASS and pathological stage remained significant by multivariate *** ability of these variables to predict 5-year progression was assessed using receiver operating characteristic curve *** had stronger predictive value than a combination of age,pathological stage,and T stage(area under the curve=0.899 and 0.715,respectively).Furthermore,Kaplan—Meier analysis of patients with low and high ASS demonstrated that high ASS was associated with significantly worse PFS than low ASS(P=1.46 × 10^(-7)).We also analyzed the biological functions of the PFS-related AS-related genes and found enrichment in pathways associated with DNA repair and ***,we identified a regulatory network of splicing factors with expression levels that correlated significantly with AS events in ***,this study identifies a novel method for risk stratification of patients and provides insight into the molecular events underlying TGCT.

关键词： alternative splicing events network progression-free survival-related model testicular germ cell tumor

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Assessing the dynamics of human activity intensity and its natural and socioeconomic determinants in Qinghai-Tibet Plateau

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Geography and Sustainability 2023年第4期4卷 294-304页

作者： Hanchu Liu Jie Fan kan Zhou Xin Xu Haipeng Zhang rui Guo Shaofeng Chen Institutes of Science and Development Chinese Academy of SciencesBeijing 100190China Institute of Geography Science and Natural Resources Research Chinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100190China College of Resources Environment&TourismCapital Normal UniversityBeijing 100048China

Investigating the spatiotemporal variation of human activity intensity and its determinants is a crucial basis for further revealing the mechanism of human-environment interaction and optimizing the human development *** this study,the human activity intensity on the Qinghai-Tibet Plateau(QTP)from 1990 to 2020 was measured based on the quantitative model of land use data and the actual regional background,and the under-lying natural and socioeconomic determinants were investigated using spatial econometric *** results demonstrate that(1)the human activity intensity in QTP has increased by 11.96%,and there are differences in different spatial scales;the areas with high human activity intensity are distributed in the Hehuang Valley where Xining City and its surrounding areas are located,as well as the One-River and Two-River Area where Lhasa City and surrounding areas are located.(2)Human activity intensity has significant positive spatial spillover,suggesting that local changes will cause changes in the same direction in adjacent areas.(3)The human activ-ity intensity in QTP is affected by various *** socioeconomic factors,the economic level has no significant impact on the human activity intensity in QTP,which differs from the general regional *** urbanization and traffic conditions have a significant positive effect,and the impact intensity continues to *** natural factors,topographic relief has a significant positive effect;the impacts of temper-ature and vegetation coverage have changed from insignificant to a significant positive effect;the impacts of precipitation and river network density have not been verified;there is no linear relationship between altitude and human activity intensity in the entire QTP,while it exists in local ***,this study proposes three policy implications for the realization of a more harmonious human-environment relationship in QTP.

关键词： Human activity intensity Spatiotemporal dynamics Natural and socioeconomic determinants Spatial econometric model Qinghai-Tibet Plateau

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A series of dithienobenzodithiophene based small molecules for highly efficient organic solar cells

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Science China Chemistry 2017年第4期60卷 552-560页

作者： Huanran feng Miaomiao Li Wang Ni Bin kan Yunchuang Wang Yamin Zhang Hongtao Zhang Xiangjian Wan Yongsheng Chen Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials State Key Laboratory and Institute of Elemento-Organic Chemistry Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) College of Chemistry Nankai University Tianjin 300071 China School of Materials Science and Engineering National Institute for Advanced Materials Nankai University Tianjin 300071 China

Three acceptor-donor-acceptor （A-D-A） small molecules DCAODTBDT, DRDTBDT and DTBDTBDT using dithieno[2,3-d：2＇,3＇-d＇]benzo[1,2-b：4,5-b＇]dithiophene as the central building block, octyl cyanoacetate, 3-octylrhodanine and thiobarbituric acid as the end groups were designed and synthesized as donor materials in solution-processed photovoltaic cells （OPVs）. The impacts of these different electron withdrawing end groups on the photophysical properties, energy levels, charge carrier mobility, morphologies of blend films, and their photovoltaic properties have been systematically investigated. OPVs device based on DRDTBDT gave the best power conversion efficiency （PCE） of 8.34%, which was significantly higher than that based on DCAODTBDT （4.83%） or DTBDTBDT （3.39%）. These results indicate that rather dedicated and balanced consideration of absorption, energy levels, morphology, mobility, etc. for the design of small-molecule-based OPVs （SM-OPVs） and systematic investigations are highly needed to achieve high performance for SM-OPVs.

关键词： acceptor-donor-acceptor dithieno[2,3-d:2',3'-d']benzo[1,2-b:4,5-b']dithiophene solution-processed photovoltaic cells endacceptor moieties

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LEO satellite clock analysis and prediction for positioning applications

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Geo-Spatial Information Science 2022年第1期25卷 14-33页

作者： kan Wang Ahmed El-Mowafy School of Earth and Planetary Sciences Curtin UniversityPerthAustralia

The positioning service aided by low Earth orbit(LEO)mega-constellations has become a hot topic in recent *** achieve precise positioning,accuracy of the LEO clocks is important for single-receiver *** bridge the gap between the applicable time of the clock products and the time of positioning,the precise LEO clocks need to be predicted over a certain period depending on the sampling interval of the clock *** study discusses the prediction errors for periods from 10 s to 1 h for two typical LEO clock types,*** ultra-stable oscillator(USO)and the oven-controlled crystal oscillator(OCXO).The prediction is based on GNSS-determined precise clock estimates,where the clock stability is related to the GNSS estimation errors,the behaviors of the oscillators themselves,the systematic effects related to the environment and the relativistic effects,and the stability of the time *** on real data analysis,LEO clocks of the two different types are simulated under different conditions,and a prediction model considering the systematic effects is *** to a simple polynomial fitting model usually applied,the proposed model can significantly reduce the prediction errors,*** about 40%-70%in simulations and about 5%-30%for real data containing different miss-modeled *** both clock types,short-term prediction of 1 min would result in a root mean square error(RMSE)of a few centimeters when using a very stable time *** RMSE amounts to about 0.1 m,when a typical real-time time reference of the national center for space studies(CNES)real-time clocks was *** long-term prediction of 1 h,the RMSE could range from below 1 m to a few meters for the USOs,depending on the complexity of the miss-modeled *** OCXOs,the 1 h prediction could lead to larger errors with an RMSE of about 10 m.

关键词： LEO clock prediction USO OCXO relativistic effects

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Explosion characteristics of aluminum-based activated fuels containing fluorine

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Defence Technology（防务技术） 2023年第2期20卷 34-43页

作者： Jin-tao Xu Lei Huang Hai-peng Jiang Tian-jiao Zhang feng-qi Zhao Jian-kan Zhang Wei Gao State Key Laboratory of Fine Chemicals Department of Chemical Machinery and Safety EngineeringDalian University of TechnologyDalian116024China Beijing Institute of Aerospace Testing Technology Beijing100074China Science and Technology on Combustion and Explosion Laboratory Xi'an Modern Chemistry Research InstituteXi'an710065China

Measuring the dust explosion characteristics of aluminum-based activated fuels was a prerequisite for developing effective prevention and control *** this paper,ignition sensitivity,flame propagation behaviors and explosion severity of aluminum/polytetrafluoroethylene(Al/PTFE)compositions including 2 PT(2.80 wt.%F),4 PT(7.18 wt.%F)and 8 PT(11.90 wt.%F)were *** the content of F increased from 2.80 wt.%to 11.90 wt.%,the minimum explosive concentration MEC decreased from380 g/m^(3)to 140 g/m^(3),due to the dual effects of increased internal active aluminum and enhanced *** average flame propagation velocities increased as the percentage of F *** maximum explosion pressure Pmof 500 g/m3aluminum-based activated fuels increased from 247 k Pa to299 *** electron microscopy demonstrated that with the increase of PTFE content,the reaction was more *** this basis,the explosion mechanism of aluminum-based activated fuels was revealed.

关键词： Aluminum-based activated fuels Ignition sensitivity Flame propagation Explosion severity Explosion mechanism

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Dithienopyrrole Based Small Molecule with Low Band Gap for Organic Solar Cells

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Chinese Journal of Chemistry 2015年第8期33卷 852-858页

作者： Miaomiao Li Wang Ni Huanran feng Bin kan Xiangjian Wan Yamin Zhang Xuan Yang Yongsheng Chen Key Laboratory for Functional Polymer Materials Centre for Nanoscale Science and TechnologyInstitute of Polymer Chemistry Collaborative Innovation of Chemical Science and Engineering ( Tianjin) College of Chemistry Nankai University Tianjin 300071 China

A low band gap acceptor-donor-acceptor （A-D-A） small molecule donor material, named DR3TDTN, has been designed and synthesized for solution-processed organic solar cells. DR3TDTN shows narrow optical band gap with value of 1.49 eV and broad absorption spectrum from 300 to 820 rim. The HOMO and LUMO energy levels of DR3TDTN are -4.74 and -3.26 eV, respectively. The optimized photovoltaic device based on DR3TDTN：PC71BM blend film shows a power conversion efficiency of 3.03% with an open-circuit voltage of 0.67 V, a short-circuit current of 8.22 mA·cm^-2 and fill factor of 0.55.

关键词： organic solar cells low band gap small molecule HOMO energy level

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Weakly coordinating group directed rhodium-catalyzed unconventional site-selective C-H olefination of indolizines at the 8-position

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Chinese Chemical Letters 2021年第1期32卷 470-474页

作者： Xue feng Jiaxin Tian Ying Sun Huayou Hu Mingzhu Lu Yuhe kan Danjun Fang Chao Wang School of Material Science and Engineering Southwest University of Science and TechnologyMianyang 6210WChina Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials School of Chemistry and Chemical EngineeringHuaiyin Normal UniversityHuaian 223300.China Department of Pharmacology.Nanjing Medical University Nanjing 210029China

A rhodium-catalyzed directing group promoted selective C-H olefination reaction of indolizines at the 8-position is re ***-olefination at 2,8-positions also achieved with silver hexafluoroantimonate as an additive under similar reaction *** coordinating groups,such as ketone,alde hyde,amide and ester,were used as directing *** ester group can be removed under acid conditions and therefore is used as a traceless directing group.

关键词： Rhodium-catalyzed C–H olefination Indolizine Weakly coordinating directing group Unconventional site-selectivity

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Anti-Jahn-Teller effect induced ultrafast insulator to metal transition in perovskite BaBiO_(3)

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npj Computational Materials 2022年第1期8卷 2148-2154页

作者： Nan feng Jian Han Changpeng Lin Zhengwei Ai Chuwen Lan Ke Bi Yuanhua Lin kan-Hao Xue Ben Xu State Key Laboratory of Information Photonics and Optical Communications School of ScienceBeijing University of Posts and Telecommunications100876BeijingChina Graduate School of China Academy of Engineering Physics 100193BeijingChina State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua University100084BeijingChina Theory and Simulation of Materials(THEOS) École Polytechnique Fédérale de LausanneCH-1015LausanneSwitzerland School of Integrated Circuits School of Optical and Electronic InformationHuazhong University of Science and Technology430074WuhanChina

The Jahn-Teller(JT)effect involves the ions M with a degenerate electronic state distorting the corner-sharing MO_(6)octahedra to lift the degeneracy,inducing strong coupling of electrons to lattice,and mediating the exotic properties in perovskite ***,the anti-Jahn–Teller(AJT)effect refers to the deformation against the Jahn-Teller-distorted MO_(6)***,it is difficult to experimentally execute both effects descending from the fine-tuning of crystal *** propose the AJT can be introduced by THz laser illumination at 11.71 THz in a candidate superconducting perovskite material BaBiO_(3)near room *** illumination coherently drives the infrared-active phonon that excites the Raman breathing mode through the quadratic-linear nonlinear *** process is characterized by the emergence of an AJT effect,accompanied by an insulator-to-metal transition occurring on the picosecond *** study underlines the important role of crystal structure engineering by coherent phonon excitation in designing optoelectronic devices.

关键词： tuning effect illumination

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