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| 1 | Hypoplastic constitutive modelling of the wetting induced creep of rockfill materials显示文摘Discrete element simulations of one-dimensional compression of breakable granular assemblies were performed to investigate the capability of the exponential compression equation suggested by Bauer.The relationship between the so-called solid hardness and the particle strength was studied so as to provide a physical background for the introduction of a time-dependent solid hardness.A hyperbolic flow rule,describing the relationship between the inclination of the strain path and the stress ratio during wetting,was proposed based on typical triaxial wetting experiments on two different rockfill materials.The flow rule was then extended and incorporated into the transformed stress based hypoplastic model to capture the direction of creep strains.Meanwhile,a new density factor was introduced to the extended model to take into account the dependence of the magnitude of creep strains on the packing density.The stiffness tensor given by the extended model was discussed and the flowchart for the integration of the constitutive equation was designed.The extended model was then embedded into a finite element program and used to simulate the triaxial compression and wetting experiments performed on the aforementioned rockfill materials.Good agreement between the model predictions and the measured results lends sufficient credibility to the extended model in reproducing the stress-stain behaviour under loading and the creep behaviour during wetting.The extended model and the finite element program were also used to investigate the deformation behaviour of an earth-rock dam at the end of construction and during first impounding.The familiar phenomena such as the wetting induced settlement of the upstream shell and the movement of the dam crest towards the upstream were successfully captured by the numerical model,which confirms the feasibility of applying the extended model to dam engineering in the future. | FU ZhongZhi CHEN ShengShui LIU SiHong | 2012 | Science China(Technological Sciences)2012，55，7： | 6 |
| 2 | Study on cosmogenic activation in germanium detectors for future tonne-scale CDEX experiment显示文摘A study on cosmogenic activation in germanium was carried out to evaluate the cosmogenic background level of natural and ^(70)Ge depleted germanium detectors. The production rates of long-lived radionuclides were calculated with Geant4 and CRY.Results were validated by comparing the simulated and experimental spectra of CDEX-1B detector. Based on the validated codes, the cosmogenic background level was predicted for further tonne-scale CDEX experiment. The suppression of cosmogenic background level could be achieved by underground germanium crystal growth and high-purity germanium detector fabrication to reach the sensitivity requirement for direct detection of dark matter. With the low cosmogenic background, new physics channels,such as solar neutrino research and neutrinoless double-beta decay experiments, were opened and the corresponding simulations and evaluations were carried out. | JingLu Ma Qian Yue ShinTed Lin Henry Tsz-King Wong JinWei Hu LiPing Jia Hao Jiang Jin Li ShuKui Liu ZhongZhi Liu Hao Ma WeiYou Tang Yang Tian Li Wang Qing Wang Yi Wang LiTao Yang Zhi Zeng | 2019 | Science China(Physics,Mechanics & Astronomy)2019，62，1： | 5 |
| 3 | Hypoplastic constitutive modeling of wetting deformation of weathered rockfill materials显示文摘The wetting deformation of weathered rockfill materials has been attracting growing attention from both engineers and scientists.The importance of realistic predictions of wetting deformations for high earth and rockfill dams is a strong motivation to establish a suitable constitutive model.Recently,the hypoplastic constitutive model by Gudehus and Bauer was extended by introducing solid hardness depending on the state of weathering.The extended model takes into account the influence of the current density,the effective stress state,the rate of deformation,and the time dependent process of degradation of the solid hardness.In the present paper,the performance of this model is evaluated by comparing numerical simulations with experiments obtained from a water sensitive rockfill material.In particular,triaxial compression paths and creep deformation under deviatoric stress states are considered.Finally,the constitutive model proposed is used to study the influence of a degradation of the solid hardness on the long term behavior of a hypothetical fill dam. | Erich BAUER Zhongzhi FU Sihong LIU | 2010 | Frontiers of Structural and Civil Engineering2010，4，1： | 5 |
| 4 | Influence of pressure and density on the rheological properties of rockfills显示文摘Long-term deformations of rockfill dams can be related to the type of dam,the pre-compaction achieved during the construction of the dam,the history of loading events,the rheological properties of the rockfill material used,the seepage behavior caused by defects of the sealing,the interactions of the dam building with the foundation,and the hydrothermal phenomena of the stressed rockfill material.The present paper investigates the theological propcrtics of coarse grained rockfill materials using a hypoplastic constitutive model.Particular attention is paid to wetting deformation under different deviatoric loading states and pre-compactions.To quantify the state of weathering a so-called“solid hardness”is used in the sense of a continuum description.It is shown that an appropriate modeling of wetting deformations requires a unified description of the interaction at least between the state of weathering,the stress state,the density and the rate of deformation.The results obtained from the numerical simulations are compared with available experimental data for a rockfill material used in Xiaolangdi earth dam. | Erich BAUER Zhongzhi FU Sihong LIU | 2012 | Frontiers of Structural and Civil Engineering2012，6，1： | 4 |
| 5 | First experimental constraints on WIMP couplings in the effective field theory framework from CDEX显示文摘We present weakly interacting massive particles(WIMPs) search results performed using two approaches of effective field theory from the China Dark Matter Experiment(CDEX), based on the data from both CDEX-1B and CDEX-10 stages. In the nonrelativistic effective field theory approach, both time-integrated and annual modulation analyses were used to set new limits for the coupling of WIMP-nucleon effective operators at 90% confidence level(C.L.) and improve over the current bounds in the low mχregion. In the chiral effective field theory approach, data from CDEX-10 were used to set an upper limit on WIMP-pion coupling at 90% C.L. We for the first time extended the limit to the m_(χ)<6 GeV/c^(2) region. | Yi Wang Zhi Zeng Qian Yue LiTao Yang KeJun Kang YuanJing Li Mehment Agartioglu HaiPeng An JianPing Chang JingHan Chen YunHua Chen JianPing Cheng Cheng Yi Chiang WenHan Dai Zhi Deng ChangHao Fang XinPing Geng Hui Gong QiuJu Guo XuYuan Guo HongJian He Li He ShengMing He JinWei Hu TuChen Huang HanXiong Huang HaiTao Jia LiPing Jia Xi Jiang HauBin Li JianMin Li Jin Li MingXuan Li RenMingJie Li Xia Li YuLan Li Bin Liao FongKay Lin ShinTed Lin ShuKui Liu YanDong Liu Yu Liu YuanYuan Liu ZhongZhi Liu Hao Ma YuCai Mao QiYuan Nie JinHua Ning Hui Pan NingChun Qi Jie Ren XiChao Ruan ChangSong Shang Vivek Sharma Ze She Lakhwinder Singh Monoj Kumar Singh TianXi Sun ChangJian Tang WeiYou Tang Yang Tian GuangFu Wang Li Wang Qing Wang Yu Chen Wang YunXiang Wang Zhen Wang Henry Tsz-King Wong ShiYong Wu YuCheng Wu HaoYang Xing Yin Xu Tao Xue YuLu Yan Nan Yi ChunXu Yu HaiJun Yu JianFeng Yue Ming Zeng BingTao Zhang Lei Zhang FengShou Zhang ZhenYu Zhang KangKang Zhao MingGang Zhao JiFang Zhou ZuYing Zhou JingJun Zhu | 2021 | Science China(Physics,Mechanics & Astronomy)2021，64，8： | 3 |
| 6 | Reversible folding/unfolding of small α-helix in explicit solvent investigated by ABEEMσπ/MM显示文摘We have performed molecular dynamics simulations on the reversible folding/unfolding of small α-helix(short Ala based peptide Ala5) in explicit water solvent in terms of ABEEMσπ/MM.A dynamics analysis shows that the α-helical turn can be preserved up to a period of about 2 ns at 300 K,which supports the conclusions of Margulis et al.The time trajectory of the root mean square deviation between the heavy atoms of the backbone and the helical reference structure indicate that 'helix melting and formation occurs rapidly on a time scale of 0.1 ns at 300 K' is not a felicitous conclusion.We first quantificationally concluded that the helix nucleation can maintain 2 ns,1―1.5 ns and 0.8 ns for Ala5 at 300 K,400 K and 500 K,respectively.Furthermore,increasing temperature dose not alter the pathway of folding/unfolding,but change the rate.An analysis of structures in a 'transition-state ensemble' shows that helix-to-coil transitions occurs predominantly through breaking of hydrogen bonds at the helix ends(92%),particularly at the C-terminus(50%).Hydrogen bonds' breaking and formation occurs on a time scale of 0.1 ns. | LIU Cui & YANG ZhongZhi Chemistry and Chemical Engineering Faculty,Liaoning Normal University,Dalian 116029,China | 2009 | Science China Chemistry2009，52，11： | 3 |
| 7 | QM/MM(ABEEM) Study on the Ligand Substitution Processes of Ruthenium(Ill) Complex NAMI-A显示文摘QM combined with ABEEMσπ (atom-bond electronegativity equalization method) fluctuating charge polariza-ble tbrce field [QM/MM(ABEEM)] has been employed to investigate the hydrolysis mechanism of ruthenium(liDcomplex NAMI-A. Eleven possible hydrolysis paths of NAMI-A and its hydrolysates have been unveiled. Struc-tures obtained by QM/MM (ABEEM) method were used to calculate the activation free energy by free energy per-turbation theory. Based on analysis of structures and activation free energies, it is found that the rate of DMSO dis-sociation is faster than that of C1- dissociation in the first step, which is in agreement with experimental results. Hy-drolysates of the first step continue to hydrolyze with lower activation free energies than that of the first hydrolysisstep, but the trans-position CI hydrolysis in the second step needs more time to perform. This can account for ex-perimental phenomenon reasonably. We have simulated further hydrolysis paths of the hydrolysates, then found thatboth CI- dissociation and DMSO dissociation take place in the third hydrolysis step and [RuCl(H20)4(lm)]^2+ is themain solute in aqueous solution after the fourth hydrolysis step. | Hui Li Ting-Ting Sun Chao Zhang Linlin Liu Dongxia Zhao Zhongzhi Yang | 2017 | Chinese Journal of Chemistry2017，35，3： | 2 |
| 8 | Discrete element simulations of two wetting effects on granular materials显示文摘To explore the microscopic responses of granular materials to wetting,the inter-particle lubrication effect and particle breakage in an odometer were simulated using a two-dimensional discrete element method.The lubrication effect was modeled by reduction of the inter-particle friction coefficient and particle breakage was initiated by decreasing the particle strength.Once the strength of the particles decreased to a threshold value,the particles began to break so that new contacts could be established to transfer the external loads.Numerical simulations successfully reproduced the additional compaction of the material and the intensification of the horizontal stress in addition to the microscopic responses of the granular assemblies.The microscopic interpretation of the earth pressure coefficient at rest and the evolution of the grain number distribution during particle breaking were also investigated. | FU ZhongZhi LIU SiHong LI Zhuo | 2011 | Chinese Science Bulletin2011，56，35： | 2 |
| 9 | An extension binary random variables显示文摘 | Liu Wen Wang Zhongzhi | 1996 | Statisics & Probability Letters 1996 281996，5158，： | 1 |
| 10 | An extension of a Theorem on Gambling Systems显示文摘 | Liu Wen Wang Zhongzhi | 1995 | Journal of Multivariate Analysis1995，55，1： | 1 |
| 11 | Biochar soil amendment increased bacterial but decreased fungal gene abundance with shifts in community structure in a slightly acid rice paddy from Southwest China显示文摘 | Junhui Chen Xiaoyu Liu Jinwei Zheng Bin Zhang Haifei Lu Zhongzhi Chi Genxing Pan Lianqing Li Jufeng Zheng Xuhui Zhang Jiafang Wang Xinyan Yu | 2013 | Applied Soil Ecology2013，，： | 1 |
| 12 | Coupled hydro - mechanical analysis of slope under rainfall using modified elasto - plastic model for unsaturat- ed soils 显示文摘 | WANG LIUJIANG LIU SIHONG FU ZHONGZHI et al | 2015 | Journal of Central South University2015，22，： | 1 |
| 13 | Osteopontin promotes the progression of gastric cancer through the NF-κBpathway regulated by the MAPK and PI3K显示文摘 | Jie Liu Qishen Liu Yali Wan Zhigang Zhao Honggang Yu Hesheng Luo Zhongzhi Tang | 2014 | International Journal of Oncology2014，，1： | 1 |
| 14 | An extension of a theorem on gambling systems to arbitrary binary random variables显示文摘 | Liu Wen Wang Zhongzhi | 1996 | Statistics and Probability Letters1996，28，2： | 1 |
| 15 | On the single-electron local kinetic energy显示文摘 | Zhongzhi Yang Alexander Yan Wang Shu-Bin Liu | 1998 | Science in China Series B: Chemistry1998，，2： | 1 |
| 16 | An Extension of a theorem on Gambling systems显示文摘 | | 1995 | Journal of Mulivariate Analysis1995，55，1： | 1 |
| 17 | A strong limit theorem on random selection for countable nonhomogeneous Markov chains显示文摘 | Wang Zhongzhi | 1996 | Chinese J Math1996，24，2： | 1 |
| 18 | Evaluating the wetting induced deformation of rockfill dams using a hypoplastic constitutive model 显示文摘 | FU Zhongzhi LIU Sihong GU Weixing | 2011 | Adv Mater Res2011，，： | 1 |
| 19 | ABEEMTT fluctuating charge force field applied to al- anine dipeptide and alanine dipeptide-water systems 显示文摘 | LIU Cui ZHAO Dongxia YANG Zhongzhi | 2010 | Journal of Theoretical and Computational Chem istry2010，9，： | 1 |
| 20 | Coordinating workload balancing and power switching in renewable energy powered data center显示文摘 | Xian LI Rui WANG Zhongzhi LUAN Yi LIU Depei QIAN | 2016 | Frontiers of Computer Science2016，10，3： | 1 |
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