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| 1 | Stress-dilatancy of Zipingpu gravel in triaxial compression tests显示文摘Experimental investigations of the dilatancy and particle breakage of gravelly material from the Zipingpu concrete-faced rockfill dam, which was subjected to high-intensity seismic load during the 2008 Wenchuan earthquake, were conducted through a series of large-scale drained triaxial compression tests. A hyperbolic relation between the input plastic work and the degree of particle breakage was found for Zipingpu gravel, independent of the initial void ratio and confining pressures. The stress-dilatancy for Zipingpu gravel was analyzed and compared with data from two rounded alluvial and three angular quarried gravelly and rockfill materials in the literature. A nearly linear relationship between the dilatancy D^p and the stress ratio η was found at medium-to-large stress ratios before the peak stress ratio. The slope of the stress-dilatancy line before peak had slight dependence on the void ratio and confining pressure of the gravel. After peak, the stress-dilatancy relation shifts down compared with that before peak for the gravel specimen. The phase-transformation stress ratio decreased with increased confining pressure, with the exception of sub-rounded gravel with little particle breakage. A nearly linear relationship was found between the phase-transformation stress ratio M_f and the state parameter y for the Zipingpu gravel, regardless of the void ratio and confining pressure of the specimens. | LIU JingMao ZOU DeGao KONG XianJing LIU HuaBei | 2016 | Science China(Technological Sciences)2016，59，2： | 9 |
| 2 | Numerical simulation of the separation between concrete face slabs and cushion layer of Zipingpu dam during the Wenchuan earthquake显示文摘The Zipingpu concrete-faced rockfill dam(CFRD)experienced strong ground motion from the 2008 Wenchuan earthquake.Separation between concrete face slabs and the cushion layer was observed after the earthquake.The separation voids under the stage III slabs make up 55%of the total area of the stage III slabs.The observed maximum height of the separation voids was nearly 23 cm at the top of the stage III slabs.Separation voids were also observed locally below the top of stage II slabs near the left abutment,with a maximum height of 7 cm.In this study,a static and dynamic elasto-plastic finite element analysis on Zipingpu CFRD was conducted to capture the separation during the Wenchuan earthquake.The rockfill materials were described using a state-dependent elasto-plastic model that considered particle breakage.The model parameters of rockfill materials were obtained from feedback analysis.The numerical results were largely consistent with the field measurements during construction and after the Wenchuan earthquake.A three-dimensional state-dependent elasto-plastic model that can trace the separation and re-contact of a soil-structure interface was employed to investigate the interaction between concrete face slabs and a cushion layer.The analysis showed the distribution of separation voids observed in the Zipingpu CFRD has a close relationship to the water level and slab dislocations at the time of the earthquake.The phenomenon of the separation from the Wenchuan earthquake was successfully captured by the proposed numerical procedure. | KONG XianJing LIU JingMao ZOU DeGao | 2016 | Science China(Technological Sciences)2016，59，4： | 8 |
| 3 | Numerical analysis of dislocations of the face slabs of the Zipingpu Concrete Faced Rockfill Dam during the Wenchuan earthquake显示文摘The Zipingpu Concrete Faced Rockfill Dam (CFRD) was obviously damaged during the Wenchuan earthquake in 2008. A wide range of dislocations occurred along the horizontal construction joints at EL. 845m, between the face slabs constructed in the second and third stages. The maximum displacement of the dislocations reached 17cm. In this study, the slab dislocations were investigated using finite element (FE) analysis. The method based on strain potential was applied to compute the permanent deformation of the Zipingpu Dam during the Wenchuan earthquake. The calculated magnitude of the slab dislocation showed good agreements with the field measurements. The dislocation mechanism was discussed. The results show that the dislocation of the concrete slab is a subsequent damage after the permanent deformation of the rockfill materials. The effects of the shear strength and the direction of the construction joints, the reservoir water level and the seismic waves were studied. The shear strength and the direction of the construction joints, reservoir water level and have a significant effect on the dislocation displacement. The dislocation can be effectively reduced by measures such as changing the direction of the construction joints or improving the shear strength at the horizontal joints. | Kong Xianjing Zhou Yang Zou Degao Xu Bin Yu Long | 2011 | Earthquake Engineering and Engineering Vibration2011，10，4： | 6 |
| 4 | Seismic performance assessment of high CFRDs based on fragility analysis显示文摘Due to a large number of high concrete face rockfill dams(CFRDs) being constructed, the seismic safety is crucially important and seismic performance assessment must be performed for such dams. Fragility analysis is a method of great vitality for seismic performance assessment; it can intuitively forecast the structural effects of different ground motion intensities and provide an effective path for structure safety assessment. However, this method is rarely applied in the field of high earth dam risk analysis.This paper introduces fragility analysis into the field of high CFRD safety assessment and establishes seismic performance assessment methods. PGA, Sa(T1, 5%), PGV and PGD are exploited as the earthquake intensity measure(IMs). Relative settlement ratio of dam crest, cumulative sliding displacement of dam slope stability and a new face-slab destroying index(based on DCR and COD) are regarded as the dam damage measures(DMs). The dividing standards of failure grades of high CFRDs are suggested based on each DM. Fragility function is estimated according to incremental dynamic analysis(IDA) and multiple stripes analysis(MSA) methods respectively from a large number of finite element calculations of a certain CFRD, and seismic fragility curves are determined for each DM. Finally, this study analyzes the failure probabilities of the dam under different earthquake intensities and can provide references and bases for the seismic performance design and safety risk assessment of high CFRDs. | PANG Rui XU Bin ZOU DeGao KONG XianJing | 2019 | Science China(Technological Sciences)2019，62，4： | 6 |
| 5 | New Discovery of Molybdenite in the Dongping Gold Deposit, Hebei Province, China and its Re-Os Geochronological Implications显示文摘The Dongping gold deposit is located on the northern margin of the North China Craton,and is the largest alkaline pluton-related gold deposit in China(Bao et al.,2014),which is characterized by its large amounts of tellurides.The deposit is largely hosted in the Shuiquangou syenitic complex and consists of auriferous quartz veins and disseminated sulfide ores.It has been extensively studied since its discovery in the 1980s;however the geochronology and genesis of the deposit are still controversial.Nie(1998)considered that the deposit was formed in the Devonian. | WANG Dazhao LIU Jiajun ZHAI Degao ZHEN Shimin WANG Jiang YANG Xi'an | 2019 | Acta Geologica Sinica(English Edition)2019，93，3： | 5 |
| 6 | A flexible various-scale approach for soil-structure interaction and its application in seismic damage analysis of the underground structure of nuclear power plants显示文摘In simulations of geotechnical engineering, interface elements are versatile tools and are widely used in the modeling of the relative displacements between soils and structures. To consider the case of a local failure adjacent to a soil-structure interaction region, a partial mesh refinement should be performed. In this study, a three-dimensional(3 D) interface element with an arbitrary number of nodes is developed as a new technique to reduce the complexity and difficulty of managing the various scales between soil and structure. An asymmetric number of nodes is permissible on the two sliding surfaces. In this manner, soil and structure can be discretized independently, and the various-scale model is established conveniently and rapidly. The accuracy of the proposed method is demonstrated through numerical examples. The various-scale approach is employed in an elasto-plastic seismic damage analysis of a buried concrete drainage culvert of a nuclear power plant. The results indicate that by applying the proposed method, the number of elements decreased by 72.5%, and the computational efficiency improved by 59% with little influence on accuracy. The proposed method is powerful for local damage evolution analyses of both soil and structure and possesses great practical significance and the potential for further application, especially for nonlinear analysis of large-scale geotechnical engineering. | QU YongQian ZOU DeGao KONG XianJing XU Bin YU Xiang | 2018 | Science China(Technological Sciences)2018，61，7： | 4 |
| 7 | New technologies accelerate the exploration of non-coding RNAs in horticultural plants显示文摘Non-coding RNAs(ncRNAs),that is,RNAs not translated into proteins,are crucial regulators of a variety of biological processes in plants.While protein-encoding genes have been relatively well-annotated in sequenced genomes,accounting for a small portion of the genome space in plants,the universe of plant ncRNAs is rapidly expanding.Recent advances in experimental and computational technologies have generated a great momentum for discovery and functional characterization of ncRNAs.Here we summarize the classification and known biological functions of plant ncRNAs,review the application of next-generation sequencing(NGS)technology and ribosome profiling technology to ncRNA discovery in horticultural plants and discuss the application of new technologies,especially the new genome-editing tool clustered regularly interspaced short palindromic repeat(CRISPR)/CRISPR-associated protein 9(Cas9)systems,to functional characterization of plant ncRNAs. | Degao Liu Ritesh Mewalal Rongbin Hu Gerald A Tuskan Xiaohan Yang | 2017 | Horticulture Research2017，4，1： | 4 |
| 8 | Folding of Tubular Waterbomb显示文摘Origami has recently emerged as a promising building block of mechanical metamaterials because it offers a purely geometric design approach independent of scale and constituent material.The folding mechanics of origami-inspired metamaterials,i.e.,whether the deformation involves only rotation of crease lines(rigid origami)or both crease rotation and facet distortion(nonrigid origami),is critical for fine-tuning their mechanical properties yet very difficult to determine for origami patterns with complex behaviors.Here,we characterize the folding of tubular waterbomb using a combined kinematic and structural analysis.We for the first time uncover that a waterbomb tube can undergo a mixed mode involving both rigid origami motion and nonrigid structural deformation,and the transition between them can lead to a substantial change in the stiffness.Furthermore,we derive theoretically the range of geometric parameters for the transition to occur,which paves the road to program the mechanical properties of the waterbomb pattern.We expect that such analysis and design approach will be applicable to more general origami patterns to create innovative programmable metamaterials,serving for a wide range of applications including aerospace systems,soft robotics,morphing structures,and medical devices. | Jiayao Ma Huijuan Feng Yan Chen Degao Hou Zhong You | 2020 | Research2020，，1： | 4 |
| 9 | Seismic cracking analyses of two types of face slab for concrete-faced rockfill dams显示文摘Estimating the cracking capacity of the face slab and recommending effective crack-control measures are important for the anti-seismic safety of concrete-faced rockfill dams(CFRDs). In this paper, two-dimensional analyses of CFRDs are performed to simulate the seismic cracking behavior of conventional reinforced concrete(RC) face slab and a type of composite face slab. The composite face slab is composed of a ductile fiber-reinforced cement-based composite(DFRCC) layer and an RC substrate. For this purpose, a co-axial rotating smeared crack model for concrete and DFRCC is coupled with the generalized plasticity model for the rockfill material, and then implemented in a finite element program. The results show that during strong earthquakes,an RC slab is more likely to develop a penetrating macro-crack in its thickness dimension. In contrast, the crack-controlling composite slab demonstrates excellent resistance to seismic cracking, and no penetrating macro-cracks are observed. Major harmful cracks that form in the concrete substrate are stopped by the DFRCC layer in composite slabs. | KONG XianJing ZHANG Yu ZOU DeGao QU YongQian YU Xiang | 2017 | Science China(Technological Sciences)2017，60，4： | 2 |
| 10 | Realization of warm white light emitting in single phase Gd(P_(x)V_(1−x))O_(4):y at% Sm^(3+),1 at% Bi^(3+) phosphor显示文摘A series of single phase,warm white light emitting phosphors,Gd(P_(x)V_(1−x))O_(4):y at%Sm^(3+),with 1 at%Bi^(3+) doping concentration were synthesized by high temperature solid state method in this work.The experimental results indicate broadband cyan emission of Bi^(3+)and characteristic orange-red emission of Sm^(3+)can be effectively tuned by changing the ratios of PO^(3−)_(4)/VO^(3−)_(4) in Gd(P_(x)V_(1−x))O_(4):1 at%Sm^(3+),1 at%Bi^(3+),and the energy transfer process among VO^(3−)_(4),Sm^(3+),Bi^(3+) also can be adjusted.Based on this,warm white light emitting can be realized by further optimizing the doping concentration of Sm^(3+) in the phosphors.At 423 K,the PL intensity of Gd(P_(0.7)V_(0.3))O_(4):2 at%Sm^(3+),1 at%Bi^(3+) remains~84.3%of the initial value at 293 K,while the measured quantum efficiency is 67.8%.EL spectrum analysis results of the fabricated white light emitting diode(wLED)based on a 310 nm UV-chip and Gd(P_(0.7)V_(0.3))O4:2 at%Sm^(3+),1 at%Bi^(3+)phosphors imply low correlated color temperature(3132 K)and appropriate color-rending index(R_(a)=82.7).These results demonstrate that Gd(P_(0.7)V_(0.3))O4:2 at%Sm^(3+),1 at%Bi^(3+)is a good candidate for manufacturing UV-activated warm white light emitting diodes. | Chao Dou Yanzhen Yin Fei Zheng Zhen Wang Shijia Sun Chen Hu Yang Che Bing Teng Degao Zhong | 2022 | Journal of Rare Earths2022，40，4： | 2 |
| 11 | Factors Controlling Precipitation of Barite and Witherite and Genesis of the Ankang-Xunyang Barium Deposits,Shaanxi,China显示文摘The barium deposits in Ankang and Xunyang counties,Shaanxi Province,China,occur in the northernmost part of the world-class barium metallogenic belt in south Qinling.The deposits are hosted by the Lower Silurian carbonaceous siliceous rocks,with a unique combination of barite and witherite.The homogenization temperatures of fluid inclusions in the barite are mainly concentrated between 135 and 155 ℃,whereas those from the witherite have two peaks of 165-175 ℃,and 215-225℃,respectively.Laser Raman analysis of fluid inclusions indicates that the vapor phase of fluid inclusions in barite is dominated by H_2O,although some contains N_2,H_2S,and CH_4.The compositions of the vapor and liquid phases of fluid inclusions in witherite can be divided into two end-members,one dominated by H_2O without other volatiles,and the other containing CH_4,C_2H_6,C_3H_8,C_2H_4,and C_6H_6 in addition to H_2O.CO_2,H_2S,and some CH_4 are interpreted as products of chemical reactions during mineralization.Organic gases(CH_4,C_2H_6,C_3H_8,C_2H_4,and C_6H_6) in the fluids were critical in the formation of barium sulfate versus carbonate.The δ^(34)S values of barite range from 38.26‰ to54.23‰(CDT),the δ^(34)S values of sulfides coexisting with barium minerals vary from 22.44‰ to25.11‰(CDT),and those in the wall rock from 11.60‰ to 19.06‰(CDT).We propose that the SO_4^(2-)generally experienced bacterial sulfate reduction in seawater before mineralization,and some SO_4^(2-)also experienced thermochemical sulfate reduction in hydrothermal system during mineralization.The δ^(13)C values of witherite range from-27.30‰ to-11.80‰(PDB),suggesting that carbon was sourced from organic substances(like CH_4,C_2H_4,and C_2H_6).The formation of witherite was possibly associated with thermochemical sulfate reduction,which caused the consumption of the organic gases and SO_4^(2-) in the hydrothermal solutions,consequently inhibiting barite formation.The important conditions for forming witherite include high fluid temperatures,high Ba^(2+) concentrations,CO_2 in the fluids,low HS^- concentrations,and the subsequent rapid diffusion of H_2S during thermochemical sulfate reduction of the fluids. | WU Shenghua LIU Jiajun ZHAI Degao | 2015 | Acta Geologica Sinica(English Edition)2015，89，3： | 2 |
| 12 | Numerical simulation of the seismic response of the Zipingpu concrete face rockfill dam during the Wenchuan earthquake based on a generalized plasticity model显示文摘 | Degao Zou Bin Xu Xianjing Kong Huabei Liu Yang Zhou | 2013 | Computers and Geotechnics2013，，： | 1 |
| 13 | Three-dimensional simulation of the construction process of the Zipingpu concrete face rockfill dam based on a generalized plasticity model显示文摘 | Bin Xu Degao Zou Huabei Liu | 2012 | Computers and Geotechnics2012，，： | 1 |
| 14 | Newly Discovered Scheelite in Quartz Vein-type Gold Deposits, Xiaoqinling Gold District, and its Geological Significance显示文摘Objective The Xiaoqinling district is the second largest goldbearing province in China after the Jiaodong region located in the eastern North China Craton. At present, seven large, 20 medium-sized and 28 small gold deposits have been discovered, and more than 1200 gold-bearing quartz veins have been identified within the metamorphic rocks of the Taihua Group. The total gold reserves are over 800 tons. | CHANG Ming LIU Jiajun CARRANZA Emmanuel John M YIN Chao ZHAI Degao WU Tong | 2020 | Acta Geologica Sinica(English Edition)2020，94，4： | 1 |
| 15 | Effects of soil dynamic response on post-earthquake deformation of slopes based on nested Newmark model显示文摘Nested Newmark model(NNM)can obtain the post-earthquake profile of the slopes in limit equilibrium or limit analysis method.The purpose of this study is to extend the NNM from the limit equilibrium method to a limit analysis method,and then involve the dynamic response of slopes into the prediction of the permanent displacement based on decoupled analysis.Parametric studies are carried out to further investigate the influences of slope height,soil shear wave velocity and input ground motion.The calculated results indicate that neglecting the dynamic response of slopes can underestimate the post-earthquake displacements.As the slope height increases or shear wave velocity reduces,the underestimation is more significant.At the fundamental natural period of the site,the underestimation is particularly remarkable.For induced earthquake waves with a small value of mean period,the influence of the dynamic response can be ignored when the fundamental period deviates from the mean period. | Zhou Zheng Gao Yufeng Zhang Fei Song Jian Zou Degao | 2020 | Earthquake Engineering and Engineering Vibration2020，19，3： | 1 |
| 16 | Numeri- cal Simulation of the Seismic Response of the Zip- ingpu Concrete Face Rockfill Dam during the Wen- chuan Earthquake Based on a Generalized Plasticity Model显示文摘 | Zou Degao Xu Bin Kong Xianjing | 2013 | Computers and Geotechnics2013，49，： | 1 |
| 17 | Hierarchical and self-supporting honeycomb LaNi_5 alloy on nickel foam for overall water splitting in alkaline media显示文摘Ni-based metallic foams possessing large specific surfaces and open cell structures are of specific interest as catalysts or catalyst carriers for electrolysis of water.Traditional fabrication of Nickel foam limits the element modification choices to several inert transition metals only on polymer foam precursor and subsequent preparation of foam-based catalysts in aqueous solution or organic electrolyte.To expand the modification horizon,molten salt with wide electrochemical window and fast ion diffusion can achieve the reduction of highly active elements.Herein,we reported is a general and facile method to deposit directly of highly reactive element La and prepare hierarchical honeycomb LaNi_(5) alloy on Ni foam(ho-LaNi_(5)/NF).This self-supporting electrode presents excellent electrical coupling and conductivity between the Ni foam and LaNi_(5),which provides a 3D self-supported heterostructure with outstanding electrocatalytic activity and excellent durability for the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER).It exhibits excellent overpotential(1.86 V)comparable to commercial coupled IrO_(2)//Pt/C(1.85 V)at a high current density of 100 m A cm^(-2).This work may pave the way for fabricating novel 3D self-supported honeycomb alloy that can be applied as electrode for usage of clean energy. | Yanze Wu Yalan Liu Kui Liu Lin Wang Lei Zhang Degao Wang Zhifang Chai Weiqun Shi | 2022 | Green Energy & Environment2022，7，4： | 1 |
| 18 | Theory,technology and practice of shale gas three-dimensional development:A case study of Fuling shale gas field in Sichuan Basin,SW China显示文摘In the Jiaoshiba block of the Fuling shale gas field,the employed reserves and recovery factor by primary well pattern are low,no obvious barrier is found in the development layer series,and layered development is difficult.Based on the understanding of the main factors controlling shale gas enrichment and high production,the theory and technology of shale gas three-dimensional development,such as fine description and modeling of shale gas reservoir,optimization of three-dimensional development strategy,highly efficient drilling with dense well pattern,precision fracturing and real-time control,are discussed.Three-dimensional development refers to the application of optimal and fast drilling and volume fracturing technologies,depending upon the sedimentary characteristics,reservoir characteristics and sweet spot distribution of shale gas,to form'artificial gas reservoir'in a multidimensional space,so as to maximize the employed reserves,recovery factor and yield rate of shale gas development.In the research on shale gas three-dimensional development,the geological+engineering sweet spot description is fundamental,the collaborative optimization of natural fractures and artificial fractures is critical,and the improvement of speed and efficiency in drilling and fracturing engineering is the guarantee.Through the implementation of three-dimensional development,the overall recovery factor in the Jiaoshiba block has increased from 12.6%to 23.3%,providing an important support for the continuous and stable production of the Fuling shale gas field. | SUN Huanquan CAI Xunyu HU Degao LU Zhiyong ZHAO Peirong ZHENG Aiwei LI Jiqing WANG Haitao | 2023 | Petroleum Exploration and Development2023，50，3： | 1 |
| 19 | Dynamic response of concrete face rockfill dam affected by polarity reversal of near-fault earthquake显示文摘In China,an increasing number of high concrete face rockfill dams(CFRDs)are located in high intensity earthquake zones,some of which are close to the seismic fault line.Recordings suggest that near-fault ground motions are characterized by large one-sided velocity pulses.The conventional dynamic analysis of dams,however,neglects the features of strong ground movements.In this study,under different ground motion levels some numerical dynamic studies considering the one-sided broadband pulses of near-fault earthquakes are presented for CFRDs based on a generalized plasticity model for rockfill materials.The results indicate that the displacements of dam crest corresponding to positive and reverse input of near-fault ground motion make a significant difference,while the displacements of the dam crest under artificial seismic waves are similar.Furthermore,using the horizontal and vertical components as simultaneous excitations near the faults,the displacements of the dam crest before and after reversing the motion produce a larger difference than that using a single component.More importantly,the difference of horizontal displacements of the dam crest caused by polarity reversal of near-fault ground motions increases with the increase of earthquake intensity.Due to the randomness and uncertainties of earthquakes,using a stochastic near-field motion input as excitation without considering the polarity(i.e.,positive vs reversed waveform),does not necessarily obtain a conservative result. | Jiang Qiuting Zou Degao Han Huichao Liu Jingmao | 2022 | Earthquake Engineering and Engineering Vibration2022，21，1： | 1 |
| 20 | Three-dimensional simulation of the construction process of the Zipingpu concrete face rockfill dam based on a generalized plasticity model显示文摘 | Bin Xu Degao Zou Huabei Liu | 2012 | Computers and Geotechnics2012，，： | 1 |
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