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Monitoring landslide associated with reservoir impoundment using synthetic aperture radar interferometry: A case study of the Yalong reservoir

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Geodesy and Geodynamics 2022年第2期13卷 138-150页

作者： Zhe Liu Bing xu Qijie Wang Wenyan Yu Zelang miao School of Geosciences and Info-Physics Central South UniversityChangsha 410083China

The construction of large reservoirs can address the problem of uneven distribution of rivers in time and space,thereby meeting the needs of human production and ***,the huge elevation of the water level in some areas may modify the distribution of the groundwater level,causing geological disasters,such as surface deformation and *** Yalong reservoir supplies water to the downstream area of Shannan,Tibet;however,since the reservoir started storing water in 2017,the government has discovered two ancient *** this study,to monitor the deformation of the Yalong reservoir since its construction in 2014,we first used synthetic aperture radar(SAR) data and the multidimensional small baseline subset(MSBAS) method to obtain the deformation in the east-west and vertical *** result indicated the presence of three large,slow-moving landslides:Landslides I and II,located on the right bank of the Yalong reservoir,which are consistent with the results obtained by the actual survey,and a new discovery,Landslide Ⅲ,located on the left side of the ***,the experimental results indicated that the dam had undergone obvious deformation after impoundment,which should not be *** global positioning system and interferometric SAR(InSAR) timeseries deformation residual data were used to verify the accuracy of the InSAR *** results also showed that the deformation caused by the three landslides had te nded to accele rate after the rese rvoir’s impoundment,and that the failure mode was retrogressive *** found that InSAR plays a vital role in landslide detection and failure mode research around reservoirs,and assists in providing early warning for subsequent landslide disasters.

关键词： Landslide monitoring Two-dimensional deformation Yalong reservoir SBAS-InSAR

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Nitrogen interception in floodwater of rice field in Taihu region of China

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Journal of Environmental Sciences 2007年第12期19卷 1474-1481页

作者： LIANG Xin-qiang CHEN Ying-xu LI Hua TIAN Guang-ming ZHANG Zhi-jian NI Wu-zhong HE miao-miao Department of Environmental Engineering College of Natural Resources and Environmental Science Zhejiang University Hangzhou 310029 China.

A field experiment located in Taihu Lake Basin of China was conducted, by application of urea or a mixture of urea with manure, to elucidate the interception of nitrogen （N） export in a typical rice field through ＂zero-drainage water management＂ combined with sound irrigation, rainfall forecasting and field drying. N concentrations in floodwater rapidly declined before the first event of field drying after three split fertilizations, and subsequently tended to rearm to the background level. Before the first field drying, total particulate nitrogen （TPN） was the predominant N form in floodwater of plots with no N input, dissolved inorganic nitrogen （DIN） on plots that received urea only, and dissolved organic nitrogen （DON） on plots treated with the mixture of urea and manure. Thereafter TPN became the major form. No N export was found from the rice field, but total nitrogen （TN） of 15.8 kg/hm^2 was remained, mainly due to soil N sorption. The results recommended the zero-drainage water management for full-scale areas for minimizing N export.

关键词： nitrogen paddy field surface floodwater interception Taihu region

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Multi-Scale Convolutional Gated Recurrent Unit Networks for Tool Wear Prediction in Smart Manufacturing

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Chinese Journal of Mechanical Engineering 2021年第3期34卷 130-145页

作者： Weixin xu Huihui miao Zhibin Zhao Jinxin Liu Chuang Sun Ruqiang Yan School of Mechanical Engineering Xi’an Jiaotong UniversityXi’an 710049China State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an 710049China

As an integrated application of modern information technologies and artificial intelligence,Prognostic and Health Management(PHM)is important for machine health *** of tool wear is one of the symbolic applications of PHM technology in modern manufacturing systems and *** this paper,a multi-scale Convolutional Gated Recurrent Unit network(MCGRU)is proposed to address raw sensory data for tool wear *** the bottom of MCGRU,six parallel and independent branches with different kernel sizes are designed to form a multi-scale convolutional neural network,which augments the adaptability to features of different time *** features of different scales extracted from raw data are then fed into a Deep Gated Recurrent Unit network to capture long-term dependencies and learn significant *** the top of the MCGRU,a fully connected layer and a regression layer are built for cutting tool wear *** case studies are performed to verify the capability and effectiveness of the proposed MCGRU network and results show that MCGRU outperforms several state-of-the-art baseline models.

关键词： Tool wear prediction Multi-scale Convolutional neural networks Gated recurrent unit

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Functional polymer passivatingFA_(0.85)PEA_(0.15)SnI_(3) for efficient and stable lead-free perovskite solar cells

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Nano Research 2023年第1期16卷 481-488页

作者： Wenzhan xu Yu Gao miao He Shuyan Chen Hongyan Fu Guodan Wei Tsinghua-Berkeley Shenzhen Institute(TBSI) Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518000China Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen 518000China

Due to their excellent advantages such as low toxicity,superior optoelectronic properties,low-temperature fabrication,and costeffectiveness,Sn-based perovskites have become the most promising alternatives for high performance lead-free perovskite solar ***,the character of Sn ^(2+)is easily oxidized toSn ^(4+),causing unnecessary p-type self-doping and high leakage *** seriously,trap-induced non-radiative recombination from rapid crystallization causes into large energy loss with a low open circuit ***,the Sn-based solar cells have efficiency far behind the Pb-based solar ***,the polymer poly(ethylene glycol)diacrylate(PEGDA)is used to control crystal growth and passivate the defects in FA_(0.85)PEA_(0.15)SnI_(3) thin *** Sn-perovskite layer shows compact crystal with large grain size and reduced *** perovskite thin film is further processed to fabricate the inverted solar cell with device structure of ITO(indium tin oxide)/PEDOT:PSS(Poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate))/FA_(0.85)PEA_(0.15)SnI_(3)/ICBA(indene-C60 bisadduct)/BCP(bathocuproine)/Ag,which shows the power conversion efficiency(PCE)of 11.45%with voltage of 0.82 ***,corresponding perovskite solar cells exhibit an enhanced stability due to PEGDA induced compressive strain in *** work could shed light on one of successful attempts to improve Sn-based solar cell efficiency for sustainable energy conversion.

关键词： FA_(0.85)PEA_(0.15)SnI_(3) perovskites solar cells crystal growth modulation stability

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Design of novel NiSiAlY alloys in marine salt-spray environment:PartⅡ.Al-Ni-Si-Y thermodynamic dataset

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Journal of Materials Science & Technology 2021年第30期89卷 186-198页

作者： Kai xu Keke Chang miao Yu Dapeng Zhou Yong Du Liping Wang Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China

The NiSiAlY material is a promising candidate to replace NiCrAlY,which can withstand the harsh saltspray conditions in marine *** efficiently design novel NiSiAlY alloys,this work establishes a thermodynamic dataset of the Al-Ni-Si-Y quaternary system using the CALPHAD(CALculation of PHAse Diagrams)*** employ this database to calculate and predict the phase constitutions and solidification behaviors of different NiSiAlY alloys concerning the content variations of Al and *** have further proposed the selection of the NiSiAlY alloys for serving in marine salt-spray environment with three constraints:(i)outstanding mechanical property;(ii)good high-temperature anti-oxidation;(iii)excellent corrosion *** results in a compositional range of the NiSiAlY alloys with 1 wt%

关键词： Materials design NiSiAlY CALPHAD Alloys High-temperature corrosion resistance

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Hydraulic calculation and dynamic analysis of columnar reversing gate

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Water Science and Engineering 2011年第3期4卷 294-304页

作者： You-an HU Meng WANG miao-miao WANG Ge SONG Wen-xuan NIU Ting xu College of Mechanical and Electrical Engineering Hohai University Changzhou 213022 P. R. China

According to the hydraulic calculation principles of the orifice outflow, the discharge capacity of the columnar reversing gate under the partial opening condition was calculated and checked. Using ANSYS, a large finite element analysis software, the discharge process was simulated. The distribution rule of the velocities in the gate chamber and downstream channel was obtained. An FEM model of the columnar reversing gate was built, and the natural vibration properties of the gate were analyzed. Based on the Westergaard added mass method, the added mass caused by the fluid-structure coupling motion was taken into account, and the effects of the coupling interaction were discussed. The results show that the size of the small gates meets the demand for discharge capacity, the current in the gate chamber is quite turbulent, the trunnion and arms are obviously impacted by flow, and the effects of water on vibration characteristics are remarkable. The study provides a reference for the design and calculation of gates of the same type.

关键词： columnar reversing gate hydraulic calculation structural dynamic analysis finite element analysis

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New Kinetics Equation for Stress Relaxation of Semi-crystalline Polymers below Glass Transition Temperature

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Chinese Journal of Polymer Science 2022年第12期40卷 1662-1669,I0010页

作者： Cheng Zhang Li-Hai Cai Bao-Hua Guo Bing miao Jun xu Advanced Materials Laboratory of Ministry of Education Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Tsinghua Innovation Center in Dongguan Dongguan 523808China Center of Materials Science and Optoelectronics Engineering College of Materials Science and Opto-Electronic TechnologyUniversity of Chinese Academy of SciencesBeijing 100049China

The stress relaxation of semi-crystalline nylon 1010 cannot be fitted by the Kohlrausch-Williams-Watts formula when the experiments were performed at pre-yielding regime below the glass transition *** study this problem and identify the two-step mechanism of stress *** short time scale,relaxation is fast,dominated by stress biased thermal fluctuation with a fixed short-range length scale(activation volume).At long time scale,relaxation is slow due to the emergence of a cooperative long-range length scale determined by the stress *** cooperative length scale is proportional to the reciprocal of stress and the amplitude of stress fluctuation is the product of stress and activation *** on this two-step mechanism,we propose a new kinetics equation to capture the stress relaxation effectively,where the short time relaxation is described by an Eyring-like local activation and the long-time relaxation is captured by a cooperative excitation process resorting to an extension from the random first order transition *** equation fits the experimental data well and can serve as a model to guide the related experiments of relaxation processes in crystalline solids.

关键词： Stress relaxation Semi-crystalline polymers Kohlrausch-Williams-Watts(KWW)equation Random first order transition(RFOT)theory

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Fluorescent antibiotics for real-time tracking of pathogenic bacteria

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Journal of Pharmaceutical Analysis 2020年第5期10卷 444-451页

作者： Lu miao Weiwei Liu Qinglong Qiao Xiaolian Li Zhaochao xu CAS Key Laboratory of Separation Science for Analytical Chemistry Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China State Key Laboratory of Fine Chemicals Dalian University of TechnologyDalian116012China

The harm of pathogenic bacteria to humans has promoted extensive research on physiological processes of pathogens,such as the mechanism of bacterial infection,antibiotic mode of action,and bacterial antimicrobial *** of these processes can be better investigated by timely tracking of fluorophore-derived antibiotics in living *** this paper,we will review the recent development of fluorescent antibiotics featuring the conjugation with various fluorophores,and focus on their applications in fluorescent imaging and real-time detection for various physiological processes of bacteria in vivo.

关键词： Fluorescent antibiotics Live-cell tracking Fluorophore Pathogenic bacteria Fluorescent imaging

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Targeting PI3K/Akt signal transduction for cancer therapy

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Signal Transduction and Targeted Therapy 2022年第1期7卷 95-111页

作者： Yan He miao miao Sun Guo Geng Zhang Jing Yang Kui Sheng Chen Wen Wen xu Bin Li MOE Key Laboratory of Tumor Molecular Biology and Key Laboratory of Functional Protein Research of Guangdong Higher Education Institutes Institute of Life and Health EngineeringCollege of Life Science and TechnologyJinan UniversityGuangzhouChina Department of Pathology The First Affiliated Hospital of Zhengzhou UniversityHenan Key Laboratory of Tumor PathologyZhengzhouChina MOE Key Laboratory of Tumor Molecular Biology and Guangdong Provincial Key Laboratory of Bioengineering Medicine National Engineering Research Center of Genetic MedicineInstitute of BiomedicineCollege of Life Science and TechnologyJinan UniversityGuangzhouChina

The phosphatidylinositol 3-kinase(PI3K)/Akt pathway plays a crucial role in various cellular processes and is aberrantly activated in cancers,contributing to the occurrenee and progression of *** the upstream and downstream nodes of this pathway could allow full elucidation of its *** on accumulating evidenee,strategies targeting major components of the pathway might provide new in sights for can cer drug *** have explored the use of some in hibitors targeti ng this pathway to block survival ***,because oncogenic PI3K pathway activation occurs through various mechanisms,the clinical efficacies of these inhibitors are ***,pathway activation is accompanied by the development of therapeutic resista ***,strategies involvi ng pathway in hibitors and other can cer treatments in combinati on might solve the therapeutic *** this review,we discuss the roles of the PI3K/Akt pathway in various cancer phenotypes,review the current statuses of different PI3K/Akt in hibitors,and in troduce combi nation therapies con sisti ng of signaling in hibitors and conven tional cancer *** information presented herein suggests that cascading inhibitors of the PI3K/Akt signaling pathway,either alone or in combi nation with other therapies,are the most effective treatment strategy for can cer.

关键词： PI3K/Akt treatment alone

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Dynamic damage evolution of bank slopes with serrated structural planes considering the deteriorated rock mass and frequent reservoirinduced earthquakes

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International Journal of Mining Science and Technology 2023年第9期33卷 1131-1145页

作者： Xinrong Liu Yan Wang Bin xu Xiaohan Zhou xueyan Guo Luli miao School of Civil Engineering Chongqing UniversityChongqing 400045China State Key Laboratory of Coal Mine Disaster Dynamic and Control Chongqing UniversityChongqing 400044China School of River and Ocean Engineering Chongqing Jiaotong UniversityChongqing 400045China

To investigate the dynamic damage evolution characteristics of bank slopes with serrated structural planes,the shaking table model test and the numerical simulation were *** main findings indicate that under continuous seismic loads,the deformation of the bank slope increased,particularly around the hydro-fluctuation belt,accompanying by the pore water pressure *** soil pressure increased and then decreased showed dynamic variation *** the undulation angle of the serrated structural planes increased(30°, 45°, and 60°),the failure modes were climbing,climbinggnawing,and gnawing *** first-order natural frequency was used to calculate the damage degree(Dd)of the bank *** microseisms and small earthquakes,it was discovered that the evolution of Dd followed the“S”shape,which was fitted by a logic ***,the quadratic function was used to fit the Dd during moderately strong *** the numerical simulation,the variation characteristics of safety factors(Sf)for slopes with serrated structural planes and slopes with straight structural planes were *** continuous seismic loads,the Sf of slopes with straight structural planes reduce stalely,whereas the Sf for slopes with serrated structural planes was greater than the former and the reduction rate was increasing.

关键词： Rock bedded slope Serrated structural planes Reservoir-induced earthquakes Hydro-fluctuation belt Damage evolution

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