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| 1 | Progress in Global Gas Hydrate Development and Production as a New Energy Resource显示文摘Natural gas hydrates have been hailed as a new and promising unconventional alternative energy,especially as fossil fuels approach depletion,energy consumption soars,and fossil fuel prices rise,owing to their extensive distribution,abundance,and high fuel efficiency.Gas hydrate reservoirs are similar to a storage cupboard in the global carbon cycle,containing most of the world's methane and accounting for a third of Earth's mobile organic carbon.We investigated gas hydrate stability zone burial depths from the viewpoint of conditions associated with stable existence of gas hydrates,such as temperature,pressure,and heat flow,based on related data collected by the global drilling programs.Hydrate-related areas are estimated using various biological,geochemical and geophysical tools.Based on a series of previous investigations,we cover the history and status of gas hydrate exploration in the USA,Japan,South Korea,India,Germany,the polar areas,and China.Then,we review the current techniques for hydrate exploration in a global scale.Additionally,we briefly review existing techniques for recovering methane from gas hydrates,including thermal stimulation,depressurization,chemical injection,and CH4-CO2 exchange,as well as corresponding global field trials in Russia,Japan,United States,Canada and China.In particular,unlike diagenetic gas hydrates in coarse sandy sediments in Japan and gravel sediments in the United States and Canada,most gas hydrates in the northem South China Sea are non-diagenetic and exist in fine-grained sediments with a vein-like morphology.Therefore,especially in terms of the offshore production test in gas hydrate reservoirs in the Shenhu area in the north slope of the South China Sea,Chinese scientists have proposed two unprecedented techniques that have been verified during the field trials:solid fluidization and formation fluid extraction.Herein,we introduce the two production techniques,as well as the so-called'fbur-in-one'environmental monitoring system employed during the Shenhu production test.Methane is not currently commercially produced from gas hydrates anywhere in the world;therefore,the objective of field trials is to prove whether existing techniques could be applied as feasible and economic production methods for gas hydrates in deep-water sediments and permafrost zones.Before achieving commercial methane recovery from gas hydrates,it should be necessary to measure the geologic properties of gas hydrate reservoirs to optimize and improve existing production techniques.Herein,we propose horizontal wells,multilateral wells,and cluster wells improved by the vertical and in dividual wells applied during existing field trials.It is noteworthy that relatively pure gas hydrates occur in seafloor mounds,within near-surface sediments,and in gas migration conduits.Their extensive distribution,high saturation,and easy access mean that these types of gas hydrate may attract considerable attention from academia and industry in the future.Herein,we also review the occurrence and development of concentrated shallow hydrate accumulations and briefly introduce exploration and production techniques.In the closing section,we discuss future research needs,key issues,and major challenges related to gas hydrate exploration and production.We believe this review article provides insight on past,present,and future gas hydrate exploration and production to provide guidelines and stimulate new work into the field of gas hydrates. | LIU Liping SUN Zhilei ZHANG Lei WU Nengyou Yichao Qin JIANG Zuzhou GENG Wei CAO Hong ZHANG Xilin ZHAI Bin XU Cuiling SHEN Zhicong JIA Yonggang | 2019 | Acta Geologica Sinica(English Edition)2019，93，3： | 13 |
| 2 | Investigation into co-pyrolysis characteristics of oil shale and coal显示文摘Samples of five types of coal and oil shale from the Daqing region have been subjected to co-pyrolysis in different blending ratios with thermo-gravimetry(TG),given a heating rate of 30 °C/min to a final temperature of 900 °C.Investigations on pyrolysis of mixing coal and oil shale in different proportions were carried out,indicating that the main scope of weight loss corresponding to hydrocarbon oil and gas release was between 350 and 550 °C.At higher temperatures,significant weight loss was attributed to coke decomposition.Characteristic pyrolysis parameters of blends from oil shale and the high ranked XZ coal varied with the blending ratio,but oil shale dominated the process.At the same blending proportions,highly volatile medium and low ranked coal of low moisture and ash content reacted well during pyrolysis and could easily create synergies with oil shale.Medium and high ranked coal with high moisture content played a negative role in co-pyrolysis. | Miao Zhenyong Wu Guoguang Li Ping Meng Xianliang Zheng Zhilei | 2012 | International Journal of Mining Science and Technology2012，22，2： | 9 |
| 3 | Characteristics of pantograph‐catenary arc under low air pressure and strong airflow显示文摘Pantograph‐catenary arc fault is the primary factor threatening the stability of the power transmission for high‐speed railway.The motion characteristics of the pantograph‐catenary arc under low air pressure and strong airflow is significantly different from the case under atmospheric pressure.In this paper,an experimental platform of panto-graph‐catenary arc was built to investigate arc root position‐time and arc column lon-gitudinal drift height‐time characteristic curves under different air pressures and airflow velocites.Via analysing the corresponding results,it can be found that there are different arc root-arc column traction mechanisms at different stages of arc development.The arcing time and arc root stagnation time under low air pressure are significantly longer than the case under atmospheric pressure,resulting in more serious electrode ablation.The arc column longitudinal drift velocity and height are greater with the increase of airflow velocity.Two typical irregular arc motion phenomena-arc root jumping and arc reignition are observed.To clarify the internal mechanism of the above phenomenon,a magnetohydrodynamics(MHD)model of the pantograph‐catenary arc was lauched,the influence mechanism of the pantograph‐catenary arc temperature and voltage are studied,and the physical process of arc temperature oscillation is analysed.The research results provide theoretical support for arc protection in high‐altitude areas. | Zhilei Xu Guoqiang Gao Wenfu Wei Zefeng Yang Wenhan Xie Keliang Dong Yaguang Ma Yan Yang Guangning Wu | 2022 | High Voltage2022，7，2： | 7 |
| 4 | Pantograph-catenary electrical contact system of high-speed railways:recent progress,challenges,and outlooks显示文摘As the unique power entrance,the pantograph-catenary electrical contact system maintains the efficiency and reliability of power transmission for the high-speed train.Along with the fast development of high-speed railways all over the world,some commercialized lines are built for covering the remote places under harsh environment,especially in China;these environmental elements including wind,sand,rain,thunder,ice and snow need to be considered during the design of the pantograph-catenary system.The pantograph-catenary system includes the pantograph,the contact wire and the interface—pantograph slide.As the key component,this pantograph slide plays a critical role in reliable power transmission under dynamic condition.The fundamental material characteristics of the pantograph slide and contact wire such as electrical conductivity,impact resistance,wear resistance,etc.,directly determine the sliding electrical contact performance of the pantograph-catenary system;meanwhile,different detection methods of the pantograph-catenary system are crucial for the reliability of service and maintenance.In addition,the challenges brought from extreme operational conditions are discussed,taking the Sichuan-Tibet Railway currently under construction as a special example with the high-altitude climate.The outlook for developing the ultra-high-speed train equipped with the novel pantograph-catenary system which can address the harsher operational environment is also involved.This paper has provided a comprehensive review of the high-speed railway pantograph-catenary systems,including its progress,challenges,outlooks in the history and future. | Guangning Wu Keliang Dong Zhilei Xu Song Xiao Wenfu Wei Huan Chen Jie Li Zhanglin Huang Jingwei Li Guoqiang Gao Guozheng Kang Chuanjun Tu Xingyi Huang | 2022 | Railway Engineering Science2022，30，4： | 5 |
| 5 | Synthesis of two lanthanide clusters Ln^(Ⅲ)_(4)(Gd_(4) and Dy_(4)) with [2×2] square grid shape:Magnetocaloric effect and slow magnetic relaxation behaviors显示文摘Two isostructural tetranuclear lanthanide clusters named [Ln_(4)(L)_(4)(CH_(3) O)_(4)]·CH_(3) OH(Ln=Gd(Ⅲ) for 1,Dy(Ⅲ) for 2,H_(2) L=N’-(2-hydroxy-3-methoxybenzylidene)-6-(hydroxymethyl) picolinohydrazide) were successfully isolated by using a polydentate Schiff based ligand and Ln(Ⅲ) nitrate salts.The structures of 1 and 2 were characterized by X-ray structural analyses,they are held by four double deprotonated ligands L2-.In them all the lanthanide ions are eight-coordinated and distributed over four vertices of a parallelogram,presenting a Ln4 cluster with a strict [2 × 2] square grid pattern.The details of magnetic analysis show that 1 displays weak anti-ferromagnetic exchange between neighboring Gd(Ⅲ) ions through carboxylate oxygen and methanol oxygen ligand atoms.Furthermore,1 exhibits significant magnetocaloric effect with the maximum entropy change-ΔSm value of 28.5 J/(kg K) for ΔH=7.0 T at 2.0 K.For compound 2,remarkable slow magnetic relaxation behaviors are observed in the presence of zero magnetic field with τ0=1.02 × 10^(-6) s and energy barrier ΔE/kB=43.24 K. | Chunying Xu Zhilei Wu Chenjuan Fan Lili Yan Wenmin Wang Baoming Ji | 2021 | Journal of Rare Earths2021，39，9： | 2 |
| 6 | A novel terbium metal-organic framework for luminescence sensing of pyridine:Synthesis,structure,selectivity,sensitivity and recyclability显示文摘One novel two-dimensional(2D)terbium-based framework[Tb(L2-)(Ac)(DMA)]n(1)(H2 L=4’-(3,5-dicarboxyphenyl)-4,2’:6’,4'-terpyridine)was successfully isolated and structurally characterized.The structural analysis reveals that two Tb3+ions in 1 are bridged by twoη1:η1:μ2 carboxylates from L2-to form a binuclear unit,which is further linked by L2-to generate a 2D layer with kgd topology.Moreover,1 displays excellent thermostability and extensive solvent stability.Luminescent measurements reveal that 1 can be used as a recyclable luminescent probe for detecting pyridine with the lowest detection lim it of 0.12 vol%,and the luminescent mechanism is also discussed. | Ying Shi Liyuan He Xinxin Wang Zhilei Wu Ning Gao Huan Zhang Wenmin Wang Jianzhong Cui | 2020 | Journal of Rare Earths2020，38，11： | 2 |
| 7 | Research Progress of Seafloor Pockmarks in Spatio-Temporal Distribution and Classification显示文摘Seafloor pockmarks are important indicators of submarine methane seepages and slope instabilities.In order to promote the understanding of submarine pockmarks and their relationship with sediment instabilities and climate changes,here we summarize the research results of pockmarks in the spatio-temporal distributions and shaping factors.Most of pockmarks occur along active or passive continental margins during the last 25 kyr B.P..Circular and ellipse are the most common forms of pockmarks,whereas pockmarks in a special crescent or elongated shape are indicators of slope instabilities,and ring-shape pockmarks are endemic to the gas hydrate zones.Further researches should be focused on the trigger mechanism of climate changes based on the pockmarks in the high latitudes formed during the deglaciation periods,and the role of gas hydrates in the seafloor evolution should be elucidated.In addition,the feature of pockmarks at their early stage(e.g.,developing gas chimneys and gas driving sedimentary doming)and the relations between pockmarks and mass movements,mud diapirs could be further studied to clarify the influences of rapid methane release from submarine sediments on the atmospheric carbon contents. | XU Cuiling XU Guoqiang XING Junhui SUN Zhilei WU Nengyou | 2020 | Journal of Ocean University of China2020，19，1： | 1 |
| 8 | Phonon lasing in a hetero optomechanical crystal cavity显示文摘Micro-and nanomechanical resonators have emerged as promising platforms for sensing a broad range of physical properties,such as mass,force,torque,magnetic field,and acceleration.The sensing performance relies critically on the motional mass,mechanical frequency,and linewidth of the mechanical resonator.Herein,we demonstrate a hetero optomechanical crystal(OMC)cavity based on a silicon nanobeam structure.The cavity supports phonon lasing in a fundamental mechanical mode with a frequency of 5.91 GHz,an effective mass of 116 fg,and a mechanical linewidth narrowing in the range from 3.3 MHz to 5.2 kHz,while the optomechanical coupling rate is as high as 1.9 MHz.With this phonon laser,on-chip sensing can be predicted with a resolution of δλ∕λ=1.0×10^(−8).The use of a silicon-based hetero OMC cavity that harnesses phonon lasing could pave the way toward high-precision sensors that allow silicon monolithic integration and offer unprecedented sensitivity for a broad range of physical sensing applications. | KAIYU CUI ZHILEI HUANG NING WU QIANCHENG XU FEI PAN JIAN XIONG XUE FENG FANG LIU WEI ZHANG YIDONG HUANG | 2021 | Photonics Research2021，9，6： | 0 |
| 9 | Phonon lasing enhanced mass sensor with zeptogram resolution under ambient conditions显示文摘High-sensitivity mass sensors under ambient conditions are essential in various fields such as biological research,gas sensing and environ-mental monitoring.In the current work,a phonon lasing enhanced mass sensor was proposed based on an optomechanical crystal cav-ity under ambient conditions.The phonon lasing was harnessed to achieve ultra-high resolution since it resulted in an extremely nar-row mechanical linewidth(less than 10 kHz).Masses with different weights were deposited on the cavity,it is predicted that the maxi-mum resolution for mass sensing can be 65±19 zg,which approaches the mass order of a protein and an oligonucleotide.This implies the potential application of the proposed method in the biomedical fields such as oligonucleotide drug delivery area and the Human Proteome Project. | Fei Pan Kaiyu Cui Yidong Huang Ziming Chen Ning Wu Guoren Bai Zhilei Huang Xue Feng Fang Liu &Wei Zhang | 2023 | Chip2023，2，3： | 0 |
| 10 | Misleading classification显示文摘In this paper,we investigate a new problem–misleading classification in which each test instance is associated with an original class and a misleading class.Its goal for the data owner is to form the training set out of candidate instances such that the data miner will be misled to classify those test instances to their misleading classes rather than original classes.We discuss two cases of misleading classification.For the case where the classification algorithm is unknown to the data owner,a KNN based Ranking Algorithm(KRA)is proposed to rank all candidate instances based on the similarities between candidate instances and test instances.For the case where the classification algorithm is known,we propose a Greedy Ranking Algorithm(GRA)which evaluates each candidate instance by building up a classifier to predict the test set.In addition,we also show how to accelerate GRA in an incremental way when naive Bayes is employed as the classification algorithm.Experiments on 16 UCI data sets indicated that the ranked candidate instances by KRA can achieve promising leaking and misleading rates.When the classification algorithm is known,GRA can dramatically outperform KRA in terms of leaking and misleading rates though more running time is required. | JIANG He XUAN JiFeng REN ZhiLei WU YouXi WU XinDong | 2014 | Science China(Information Sciences)2014，57，5： | 0 |
| 11 | Early life adversity and health inequality:a dual interaction model显示文摘This article examines the impact of early life adversity on health inequality from a life course perspective.We develop a dual interaction model that considers how both the frequency as well as the duration of early life adversity might shape an individual's health.Analyzing data from the China Health and Retirement Longitudinal Study(CHARLS,2011-2014),we show that not only does early life adversity have a direct effect on an individual's health,but throughout the life course it also produces cumulative disadvantages through worsening the individual's life conditions such as less education,lower social-economic status,and less job security.The combination of the frequency of adversity experience and the length of exposure creates an exponential effect on poor health,contributing to the persistence of health inequality in contemporary Chinese society. | Zhilei Shi Cary Wu | 2020 | The Journal of Chinese Sociology2020，7，1： | 0 |
| 12 | A genome-wide loss-of-function screening method for minimizing false-negatives caused by functional redundancy显示文摘 | Li Mao Chenglin Liu Zhen Wang Xiaofeng Niu Liang Xue Zhilei Zhou Zhenying Cai Meng Yu Yixue Li Dianqing Wu Lin Li | 2016 | Cell Research2016，26，9： | 0 |
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