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| 1 | Modeling stationary and moving cracks in shells by X-FEM with CB shell elements显示文摘The continuum-based(CB)shell theory is combined with the extended finite element method(X-FEM)in this paper to model crack propagation in shells under static and dynamic situations.Both jump function and asymptotic crack tip solution are adopted for describing the discontinuity and singularity of the crack in shells.Level set method(LSM)is used to represent the crack surface and define the enriched shape functions.Stress intensity factors(SIFs)are calculated by the displacement interpolation technique to prove the capability of the method and the maximum strain is applied for the fracture criterion.Also,an efficient integration scheme for the CB shell element with cracks is proposed. | ZENG QingLei LIU ZhanLi XU DanDan ZHUANG Zhuo | 2014 | Science China(Technological Sciences)2014，57，7： | 7 |
| 2 | On-line coupling of solid-phase extraction to liquid chromatography: a review显示文摘 | CHEN Ligang WANG Hui ZENG Qinglei | 2009 | J Chromatogr Sci2009，47，8： | 1 |
| 3 | XFEM modeling of hydraulic fracture in porous rocks with natural fractures显示文摘Hydraulic fracture(HF) in porous rocks is a complex multi-physics coupling process which involves fluid flow, diffusion and solid deformation. In this paper, the extended finite element method(XFEM) coupling with Biot theory is developed to study the HF in permeable rocks with natural fractures(NFs). In the recent XFEM based computational HF models, the fluid flow in fractures and interstitials of the porous media are mostly solved separately, which brings difficulties in dealing with complex fracture morphology. In our new model the fluid flow is solved in a unified framework by considering the fractures as a kind of special porous media and introducing Poiseuille-type flow inside them instead of Darcy-type flow. The most advantage is that it is very convenient to deal with fluid flow inside the complex fracture network, which is important in shale gas extraction. The weak formulation for the new coupled model is derived based on virtual work principle, which includes the XFEM formulation for multiple fractures and fractures intersection in porous media and finite element formulation for the unified fluid flow. Then the plane strain Kristianovic-Geertsma-de Klerk(KGD) model and the fluid flow inside the fracture network are simulated to validate the accuracy and applicability of this method. The numerical results show that large injection rate, low rock permeability and isotropic in-situ stresses tend to lead to a more uniform and productive fracture network. | Tao Wang ZhanLi Liu QingLei Zeng Yue Gao Zhuo Zhuang | 2017 | Science China(Physics,Mechanics & Astronomy)2017，60，8： | 1 |
| 4 | Experimental and numerical study on the dynamic shear banding mechanism of HfNbZrTi high entropy alloy显示文摘High-entropy alloys(HEAs) have attracted considerable attention in recent years because of their unique mechanical properties.In this work, the mechanism of dynamic shear banding(also called adiabatic shear bands, ASBs) in a BCC HEA HfNbZrTi was investigated combining dynamic experiments and numerical simulations. The temperature evolution during dynamic shear banding, which has been believed to play a dominant role during ASB formation in the literature, was measured using high-speed infrared thermal detectors synchronized with a split Hopkinson pressure bar system. The dynamic mechanical behavior of the BCC HEA was described using the Johnson-Cook model accompanied by damage accumulation. The process of ASB formation,considering potential contributions from thermal softening and damage softening, was numerically investigated by controlling the activation of each softening mechanism separately. Based on the results of experimental observation and numerical analysis,dynamic shear banding in this BCC HEA is proposed to be dominated by damage softening, and thermal softening only plays a secondary role, which differs from the thermal-softening-dominated ASB formation in typical FCC HEAs such as the Cantor alloy. | SONG Wei-Li MA Quan ZENG QingLei ZHU ShengXin SUI MingBin CAO TangQing QI Wei CHEN YinQiang YU XiaoQi XUE YunFei CHEN Hao-Sen | 2022 | Science China(Technological Sciences)2022，65，8： | 1 |
| 5 | Preparation of magnetic molecularly imprinted polymer for the separation of tetracycline antibiotics from egg and tissue samples显示文摘 | Ligang Chen Jun Liu Qinglei Zeng Hui Wang Aimin Yu Hanqi Zhang Lan Ding | 2009 | Journal of Chromatography A2009，，18： | 1 |
| 6 | Study on interaction between induced and natural fractures by extended finite element method显示文摘Fracking is one of the kernel technologies in the remarkable shale gas revolution. The extended finite element method is used in this paper to numerically investigate the interaction between hydraulic and natural fractures, which is an important issue of the enigmatic fracture network formation in fracking. The criteria which control the opening of natural fracture and crossing of hydraulic fracture are tentatively presented. Influence factors on the interaction process are systematically analyzed, which include the approach angle, anisotropy of in-situ stress and fluid pressure profile. | DanDan Xu ZhanLi Liu Zhuo Zhuang QingLei Zeng Tao Wang | 2017 | Science China(Physics,Mechanics & Astronomy)2017，60，2： | 0 |
| 7 | The expression status of ZIC2 is an independent prognostic marker of hepatocellular carcinoma显示文摘Background:Zinc finger protein of cerebellum 2(ZIC2)is a transcriptional activator or repressor that is important for the organogenesis of the central nervous system.Previous studies have reported that ZIC2 is widely upregulated in a variety of tumors.Methods:Oncomine database was used to evaluate the expression levels of ZIC2 in hepatocellular car-cinoma(HCC)and normal liver tissues.Quantitative real-time polymerase chain reaction and immu-nohistochemistry were conducted to validate the results from the database.Cox regression analysis and survival curves were performed to assess the survival effect of ZIC2 in HCC.Results:Increased expression of ZIC2 was detected in HCC tissues compared with normal liver tissues.In addition,patients with high ZIC2 levels had a poor prognosis.Multivariate analysis showed that clinical stage(T or M classification)and ZIC2 levels were independent prognostic factors for overall survival.Moreover,a subgroup analysis revealed that patients with moderate or poor grade tumors,T1e2 tumors,N0 tumors,early American Joint Committee on Cancer(AJCC)stage,and old age were more likely to present with overexpression of ZIC2.To conclude,ZIC2 is upregulated in HCC and associated with the histology and survival of HCC patients. | Qinglei Kong Wenchao Li Pan Hu Hua Zeng Yuhang Pan Taicheng Zhou Kunpeng Hu | 2020 | Liver Research2020，4，1： | 0 |
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