|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Further studies on the numerical simulation of bubble plumes in the cold seepage active region显示文摘Using the occurrence characteristics of bubble plumes in the South China Sea as a reference, this paper continues to study the seismic responses produced by bubble plumes in the cold seepage active region. To make the plume modelling scheme more reasonable, we modified the original modelling scheme and reconstructed a plume water body model based on the variation of its radius as bubbles rise in seawater. The plume seismic records of shot gathers were obtained by forward simulation. The seismic records of single shot show obvious characteristics of a scattering wave field and the periodic characteristics of the model. Seismic records of shot gathers were processed using prestack depth migration. The boundary of its imaging section has a good convergence effect.The migration sections can be imaged distinctly with higher accuracy. The aforementioned studies once again laid a foundation for the further study of the seismic responses produced by plumes. They also gradually probed a more suitable seismic data processing method for plumes and provided a theoretical guidance for the identification of plumes. | LI Canping GOU Limin YOU Jiachun LIU Xuewei OU Chuling | 2016 | Acta Oceanologica Sinica2016，35，1： | 8 |
| 2 | Sensitivity analysis of dimensionless parameters for physical simulation of water-flooding reservoir显示文摘A numerical approach to optimize dimensionless parameters of water-flooding porous media flows is proposed based on the analysis of the sensitivity factor defined as the variation ration of a target function with respect to the variation of dimensionless parameters. A complete set of scaling criteria for water-flooding reservoir of five-spot well pattern case is derived from the 3-D governing equations, involving the gravitational force, the capillary force and the compressibility of water, oil and rock. By using this approach, we have estimated the influences of each dimensionless parameter on experimental results, and thus sorting out the dominant ones with larger sensitivity factors ranging from 10?4 to 100. | BAI Yuhu LI Jiachun ZHOU Jifu | 2005 | Science China(Technological Sciences)2005，48，4： | 7 |
| 3 | An optimization approach to the similarity criteria of flows and its application显示文摘在现在的纸,我们建议一条优化途径调查复杂流动的 similiarity 标准。与这条途径,我们可以识别由数字敏感分析管理复杂流动的主导的尺寸更少变量。第一,我们定义敏感因素并且少些在尺寸上检验它的依赖变量。然后,我们使用这条途径在一座假定的油水库学习多孔的媒介流动的类似标准。从数字敏感分析获得的类似原则与理论法律一致,因此表明建议优化途径的可行性。进一步的解释被从它的原型在一个模型分析压力分发的偏差给。另外,我们在敏感因素上检验流动参数变化的效果并且发现主导的尺寸更少变量可以从参数的不同集合变化。 | ZHOU Jifu LI Jiachun | 2006 | Progress in Natural Science:Materials International2006，16，3： | 5 |
| 4 | Effects of volumetric allocation on heave response of semisubmersible in deep sea显示文摘The configuration of semisubmersibles consisting of pontoons and columns and their corresponding heave motion response in incident progressive waves are examined. The purpose of the present study is to provide a theoretical approach to estimating the effects of volumetric allocation on natural period and response amplitude operator (RAO) in heave motion. We conclude that the amplitude of heave motion response can be considerably suppressed by appropriately adjusting volumetric allocation so that the natural heave period keeps away from the range of wave energy. The theoretical formulae are found in good agreement with the corresponding computational results by WAMIT. | ZHANG HuiQin LI JiaChun | 2009 | Science China(Technological Sciences)2009，52，3： | 5 |
| 5 | Numerical Simulation of Bubble Plumes and an Analysis of Their Seismic Attributes显示文摘To study the bubble plume's seismic response characteristics,the model of a plume water body has been built in this article using the bubble-contained medium acoustic velocity model and the stochastic medium theory based on an analysis of both the acoustic characteristics of a bubble-contained water body and the actual features of a plume.The finite difference method is used for forward modelling,and the single-shot seismic record exhibits the characteristics of a scattered wave field generated by a plume.A meaningful conclusion is obtained by extracting seismic attributes from the pre-stack shot gather record of a plume.The values of the amplitude-related seismic attributes increase greatly as the bubble content goes up,and changes in bubble radius will not cause seismic attributes to change,which is primarily observed because the bubble content has a strong impact on the plume's acoustic velocity,while the bubble radius has a weak impact on the acoustic velocity.The above conclusion provides a theoretical reference for identifying hydrate plumes using seismic methods and contributes to further study on hydrate decomposition and migration,as well as on distribution of the methane bubble in seawater. | LI Canping GOU Limin YOU Jiachun | 2017 | Journal of Ocean University of China2017，16，2： | 4 |
| 6 | Estimation of extreme wind speed in SCS and NWP by a non-stationary model显示文摘In offshore engineering design, it is considerably significant to have an adequately accurate estimation of marine environmental parameters, in particular, the extreme wind speed of tropical cyclone(TC) with different return periods to guarantee the safety in projected operating life period. Based on the 71-year(1945–2015) TC data in the Northwest Pacific(NWP) by the Joint Typhoon Warning Center(JTWC) of US, a notable growth of the TC intensity is observed in the context of climate change. The fact implies that the traditional stationary model might be incapable of predicting parameters in the extreme events.Therefore, a non-stationary model is proposed in this study to estimate extreme wind speed in the South China Sea(SCS) and NWP. We find that the extreme wind speeds of different return periods exhibit an evident enhancement trend, for instance, the extreme wind speeds with different return periods by nonstationary model are 4.1%–4.4% higher than stationary ones in SCS. Also, the spatial distribution of extreme wind speed in NWP has been examined with the same methodology by dividing the west sea areas of the NWP 0°–45°N, 105°E–130°E into 45 subareas of 5°× 5°, where oil and gas resources are abundant.Similarly, remarkable spacial in-homogeneity in the extreme wind speed is seen in this area: the extreme wind speed with 50-year return period in the subarea(15°N–20°N, 115°E–120°E) of Zhongsha and Dongsha Islands is 73.8 m/s, while that in the subarea of Yellow Sea(30°N–35°N, 120°E–125°E) is only47.1 m/s. As a result, the present study demonstrates that non-stationary and in-homogeneous effects should be taken into consideration in the estimation of extreme wind speed. | Lizhen Wang Jiachun Li | 2016 | Theoretical & Applied Mechanics Letters2016，6，3： | 4 |
| 7 | RUNOFF GENERATION CHARACTERISTICS IN TYPICAL EROSION REGIONS ON THE LOESS PLATEAU显示文摘This paper presents a process-based model for runoff generation on slopes. One dimensional kinematic wave theory combined with the revised Green-Ampt infiltration formula is applied in the model. According to the characteristics of soil and rainfall in the Loess Plateau area, six types of storm are defined, and among them three typical erosion zones that have different values of representative parameters are chosen to simulate the runoff generation processes. The primary hydraulic characteristics of the runoff generation, such as unit discharge, runoff depth, flow velocity, shear stress and ratio of runoff generation, are obtained and analyzed. The results demonstrate that the different erosion characteristics are related to different runoff generation zones. | Li CHEN, Qingquan LIU, and Jiachun LI 1.2.3 Division of Engineering Sciences, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China E-mail: qqliu@mail.imech.ac.cn | 2001 | International Journal of Sediment Research2001，16，4： | 4 |
| 8 | Validity ranges of interfacial wave theories in a two-layer fluid system显示文摘在现在的论文,我们努力完成一张图,它在一个二层的系统为界面的波浪理论界定有效性范围,到在海洋工程满足设计的需要。根据周期、独居的波浪的可得到的答案,我们作为原则建议一个指南以波浪时期 T 识别界面的波浪理论的有效性区域,波浪高度 H ,上面的层厚度 d 1,和更低的层厚度 d 2,作为在水表面波浪情形浇深度 d 而不是仅仅一个参数。如果无穷和上面的层的水深度比率 r = d 1/d 2 途径浇密度 ρ
1 到零,这里建议的图碰巧是 Le M é haut é为免费表面波浪的阴谋。相反,如果在它的严肃加速 g 被在 σ
= 的条件下面在这研究定义的减少的严肃代替,为水表面波浪的图能被用于二层的界面的波浪(ρ
2−
ρ
1)/ρ2→
1.0 并且 r >
1.0。最后,为在二层的液体的各种各样的界面的波浪理论的有效性范围的几个数字被给并且与表面的结果相比飘动。 | Yutang Yuan Jiachun Li Youliang Cheng | 2007 | Acta Mechanica Sinica2007，23，6： | 3 |
| 9 | Strength softening models of soil and its application in rainfall-induced landslide simulation显示文摘In this study, strength softening models are developed for exploring rainfall-induced landslide mechanism based on Mohr-Coulomb strength theory with both saturation degree and temporal evolution into consideration. According to the ratio of two time scales available, the model can be classified into three categories, i.e., instant softening model, delay softening model, and coupling softening model. Corresponding evolution functions are specified to represent these kinds of softening processes and then applied to simulate landslide of homogeneous slopes triggered by rainfall, therefrom, useful conclusions can be drawn in the end. | Zhendong Fu Jiachun Li | 2013 | Theoretical & Applied Mechanics Letters2013，3，4： | 3 |
| 10 | Effects of rainfall infiltration on deep slope failure显示文摘With the finite element method and the limit equilibrium method, a numerical model has been established for examining the effects of rainfall infiltration on the stability of slopes. This model is able to availably reflect the variations in pore pressure field in slopes, dead weight of soil, and the softening of soil strength caused by rainfall infiltration. As a case study, an actual landslide located at the Nongji Jixiao in Chongqing is studied to analyze the effects of rainfall infiltration on the seepage field and the slope stability. The simulated results show that a deep slope failure is prone to occur when rainfall infiltration will lead to a remarkable variation in the seepage field, in particular, for large range pore water pressure increase in slopes. | SUN JianPing LIU QingQuan LI JiaChun AN Yi | 2009 | Science China(Physics,Mechanics & Astronomy)2009，52，1： | 3 |
| 11 | Numerical analysis of rainfall infiltration in the slope with a fracture显示文摘With the finite volume method, a 2D numerical model for seepage in unsaturated soil has been established to study the rainfall infiltration in the fractured slope. The result shows that more rain may infiltrate into the slope due to existing fracture and then the pore pressure rises correspondingly. Very probably, it is one of the crucial factors accounting for slope failure. Furthermore a preliminary study has been conducted to investigate the influence of various fracture and rainfall factors such as the depth, width and location of a crack, surface condition, rainfall intensity and duration. Pore pressure and water volumetric content during the transient seepage are carefully examined to reveal the intrinsic mechanism. | FAN Ping LIU Qingquan LI Jiachun SUN Jianping | 2005 | Science China(Technological Sciences)2005，48，z1： | 3 |
| 12 | Effects of tide-surge interaction and wave set-up/set-down on surge: case studies of tropical cyclones landing China's Zhe-Min coast显示文摘Storm surge along the China's Zhe-Min coast is addressed using the tightly coupled surge model of ADCIRC+SWAN.In this study,we primarily focus on the effects of surge-tide interaction and wave set-up/set-down.And the influences of intensity and landing moment of tropical cyclone(TC)are also presented.The results show that:water elevation without considering tide-surge interaction tends to be underestimated/overestimated when TC lands during astronomical low/high tide;tide-surge coupling effect is more pronounced north of TC track(more than 0.7 m in our cases);irrelevant to TC's intensity,wave set-up south of TC track is negligible because the depth-related wave breaking doesn't occur in water body blown towards open seas. | Qingyong Wuxi Jiachun Li Bingchuan Nie | 2018 | Theoretical & Applied Mechanics Letters2018，8，3： | 3 |
| 13 | High efficient catalytic oxidation of 5-hydroxymethylfurfural into 2,5-furandicarboxylic acid under benign conditions with nitrogen-doped graphene encapsulated Cu nanoparticles显示文摘Selective oxidation of 5-hydroxymethylfurfual(HMF) to 2,5-furandicarboxylic acid(FDCA) as a bioplastics monomer is efficiently promoted by a simple system without noble-metal and base additives. In this work, graphene oxide(GO) was first synthesised by an electrochemical method with flexible graphite paper(FGP) as start carbon material, then, nitrogen-doped graphene(NG) layers encapsulated Cu nanoparticles(NPs) was prepared by one-step thermal treatment of GO supported Cu2+ in flowing NH3 atmosphere. Compared with NG supported Cu NPs prepared by the traditional impregnation method, enhanced catalytic activity was achieved over Cu/NG and an FDCA yield of 95.2% was achieved under mild reaction conditions with tert-butylhydroperoxide(t-BuOOH) as the oxidant. Control experiments with different catalysts and different addition procedure of t-BuOOH showed the yield of HMF and various intermediates during reaction. From the changing of intermediates concentrations and reaction rates, a reaction pathway through HMF-DFF-FFCA-FDCA was proposed. This work gives a more convenient, more green,more economical and effective method in encapsulated metal NPs preparation and high selectivity in HMF oxidation to FDCA under mild conditions. | Chaoxin Yang Xiao Li Zhenzhou Zhang Bohan Lv Jiachun Li Zhenjian Liu Wanzhen Zhu Furong Tao Guangqiang Lv Yongxing Yang | 2020 | Journal of Energy Chemistry2020，29，11： | 3 |
| 14 | Field acoustic measurements of high-speed train sound along BTIR显示文摘In this paper,single-point field measurements of noise radiated from high-speed trains were performed at two sites along Beijing-Tianjin intercity railway(BTIR),aiming at acquiring the realistic acoustic data for validation and verification of physical model and computational prediction.The measurements showed that A-weighted sound pressure levels(SPLs) were between 80 and 87 dBA as trains passed.The maximum noise occurred at the moment when the pantograph arrived,suggesting that pantograph noise was one of the most significant sources.Sound radiated from high-speed trains of BTIR was a typical broadband spectrum with most acoustic power restricted in the range of medium-high frequency from about 400 Hz to 5 kHz.Aerodynamic noise was shown to be the dominant one over other acoustic sources for high-speed trains. | YU HuaHua LI JiaChun | 2013 | Science China(Physics,Mechanics & Astronomy)2013，56，2： | 2 |
| 15 | Seepage-stress coupled modeling for rainfall induced loess landslide显示文摘Although rainfall is rare on the Loess Plateau of western China, landslides occur frequently there in rainy season. Surveys report that landslide hazards always follow heavy rains. In this study, a seepage-stress coupling model for rainfall induced landslide is used to examine an actual disastrous event in Yulin by the end of July, 2017. The effects of rainfall duration, rainfall intensity and soil weakening on slope stability are studied in detail. The results illustrate that the safety factor drops sharply at first and then is gradually declining to below 1.05 during additional two days of heavy rain. With soil strength softening considered, the slope would be more unstable, in which the weakening in soil cohesion is found to be a more sensitive factor. | Danyang Zhou Zhen Zhang Jiachun Li Xiaoliang Wang | 2019 | Theoretical & Applied Mechanics Letters2019，9，1： | 2 |
| 16 | Effects of incident wind/wave directions on dynamic response of a SPAR-type floating offshore wind turbine system显示文摘As a promising renewable energy,offshore wind energy currently is gaining more attention,by which the economic and efficient operation of floating wind turbine systems is a potential research direction.This study is primarily devoted to the analysis of dynamic response of the NREL-5 MW reference wind turbine supported by an OC3-Hywind SPAR-type platform using a recompiled code which combines FAST with WAMIT.To verify the reliability of the recompiled code,the free decay motions of a floating wind turbine system in still water are examined with satisfactory results.After that,thirteen scenarios with different angles between wind and wave from 0°to 90°are investigated.The dynamic responses of the turbine system in various degrees of freedom(DOFs)for different incident wind/wave directions are presented in both time and frequency domains via the fast Fourier transform. | Guoqin Lyu Huiqin Zhang Jiachun Li | 2019 | Acta Mechanica Sinica2019，35，5： | 2 |
| 17 | Modeling on runoff concentration caused by rainfall on hillslopes and application in Maoping slope显示文摘基于陆上的流动的集中流动线取决于山斜坡的表面地形的事实,一个运动学的波浪模型为模仿降雨在山斜坡上引起的流量产生和流动集中被开发。模仿模型的结果与试验性的观察同意很好。把模型用于 Maoping 斜坡的实际盒子,我们在斜坡上获得了流量产生和渗入的特征。特别,模仿的结果足够地反映了表面流量的汇合的模式,它为设计在 Maoping 斜坡上设计的排水提供一个科学基础。 | LIU Qingquan LI Jiachun | 2006 | Progress in Natural Science:Materials International2006，16，10： | 2 |
| 18 | Brain imaging of mild cognitive impairment and Alzheimer's disease显示文摘The rapidly increasing prevalence of cognitive impairment and Alzheimer's disease has the potential to create a major worldwide healthcare crisis. Structural MRI studies in patients with Alzheimer's disease and mild cognitive impairment are currently attracting considerable interest. It is extremely important to study early structural and metabolic changes, such as those in the hippocampus, entorhinal cortex, and gray matter structures in the medial temporal lobe, to allow the early detection of mild cognitive impairment and Alzheimer's disease. The microstructural integrity of white matter can be studied with diffusion tensor imaging. Increased mean diffusivity and decreased fractional anisotropy are found in subjects with white matter damage. Functional imaging studies with positron emission tomography tracer compounds enable detection of amyloid plaques in the living brain in patients with Alzheimer's disease. In this review, we will focus on key findings from brain imaging studies in mild cognitive impairment and Alzheimer's disease, including structural brain changes studied with MRI and white matter changes seen with diffusion tensor imaging, and other specific imaging methodologies will also be discussed. | Changhao Yin Siou Li Weina Zhao Jiachun Feng | 2013 | Neural Regeneration Research2013，8，5： | 2 |
| 19 | High-rate nitrogen removal by the Anammox process with a sufficient inorganic carbon source显示文摘 | Jiachun Yang Li Zhang Yasuhiro Fukuzaki Daisuke Hira Kenji Furukawa | 2010 | Bioresource Technology2010，，24： | 2 |
| 20 | Simulation of triaxial response of granular materials by modified DEM显示文摘A modified discrete element method(DEM)with rolling effect taken into consideration is developed to examine macroscopic behavior of granular materials in this study.Dimensional analysis is firstly performed to establish the relationship between macroscopic mechanical behavior,mesoscale contact parameters at particle level and external loading rate.It is found that only four dimensionless parameters may govern the macroscopic mechanical behavior in bulk.The numerical triaxial apparatus was used to study their influence on the mechanical behavior of granular materials.The parametric study indicates that Poisson’s ratio only varies with stiffness ratio,while Young’s modulus is proportional to contact modulus and grows with stiffness ratio,both of which agree with the micromechanical model.The peak friction angle is dependent on both inter-particle friction angle and rolling resistance.The dilatancy angle relies on inter-particle friction angle if rolling stiffness coefficient is sufficiently large.Finally,we have recommended a calibration procedure for cohesionless soil,which was at once applied to the simulation of Chende sand using a series of triaxial compression tests.The responses of DEM model are shown in quantitative agreement with experiments.In addition,stress-strain response of triaxial extension was also obtained by numerical triaxial extension tests. | WANG XiaoLiang LI JiaChun | 2014 | Science China(Physics,Mechanics & Astronomy)2014，57，12： | 2 |
您所在的机构暂未开通此部分的功能，请联系管理员