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| 1 | On the possible use of fire by Homo erectus at Zhoukoudian,China显示文摘For decades,the so-called Peking Man(Homo erectus pekinensis)at Zhoukoudian has been considered to be a hominin that engaged in the controlled production and management of fire.However,relatively recent analyses have cast doubt on this assertion.The most compelling reason for this doubt was the absence of siliceous aggregates in the Zhoukoudian deposits.This study presents evidence establishing the controlled use of fire by Homo erectus pekinensis through analyses of four soil samples sourced from Layers 4 and 6 at Zhoukoudian Locality 1.These results demonstrate that all four specimens contain siliceous aggregates as well as elemental carbon,and the potassium content of the insoluble residues of these specimens ranges between 1.21%and 2.94%.The analyses provide strong evidence of the in situ use of fire by Homo erectus pekinensis. | Maohua Zhong Congling Shi Xing Gao Xinzhi Wu Fuyou Chen Shuangquan Zhang Xingkai Zhang John W.Olsen | 2014 | Chinese Science Bulletin2014，59，3： | 4 |
| 2 | Dynamic analysis of heat extraction rate by supercritical carbon dioxide in fractured rock mass based on a thermal-hydraulic-mechanics coupled model显示文摘Heat production from geothermal reservoirs is a typical heat transfer process involving a cold working fluid contacting a hot rock formation.Compared to the thermal-physical characteristics of water,supercritical CO_(2)(scCO_(2))has a higher heat storage capacity over a wide temperature-pressure range and may be favored as a heat transfer fluid.Singularly characteristic of scCO_(2)-based heat extraction is that the hydraulic-thermal properties of the scCO_(2) vary dramatically and dynamically with the spatial pressure gradient during unsteady-state flow along fracture.This highly nonlinear behavior presents a challenge in the accurate estimation of heat extraction efficiency in scCO_(2)-based EGS.In this paper,a thermal-h ydraulic-mechanical(THM)coupled model is developed by considering deformation of the fractured reservoir,non-Darcy flow and the varying thermal-physical properties of scCO_(2).The proposed model is validated by matching the modeling temperature distribution with published data.The results show that during continuous injection of scCO_(2),the fracture first widens and then narrows,ultimately reopening over the long term.The sequential fracture deformation behaviors are in response to the combined impacts of mechanical compression and thermally-induced deformation.By controlling the injection parameters of the scCO_(2),it is found that the heat extraction rate is positively correlated to its pore pressure or mass flow rate.The heat extraction rate can be significantly enhanced,when the inlet temperature of scCO_(2) is below its critical temperature.As a result,the heat increment recovered per unit mass of scCO_(2) decreases as the hot rock is gradually cooled.Meanwhile,the heat increment recovered per unit mass of scCO_(2) decreases by increasing the inlet temperature of scCO_(2) or its mass flow rate,but increases as the outlet pressure rises.Furthermore,multi-linear regression indicates that controlling the inlet temperature of the scCO_(2) can significantly improve the thermodynamic efficiency of heat extraction. | Chunguang Wang Xingkai Shi Wei Zhang Derek Elsworth Guanglei Cui Shuqing Liu Hongxu Wang Weiqiang Song Songtao Hu Peng Zheng | 2022 | International Journal of Mining Science and Technology2022，32，2： | 3 |
| 3 | Identification of natural splice variants of SAMHD1 in virus-infectedHCC显示文摘 | Yunpeng Shi Guoyue Lv Zhe Chu Liling Piao Xingkai Liu Tuo Wang Yanfang Jiang Ping Zhang | 2014 | Oncology Reports2014，，2： | 1 |
| 4 | Dynamic coupled thermo-hydro-mechanical problem for heterogeneous deep-sea sediments under vibration of mining vehicle显示文摘Due to the influence of deep-sea environment,deep-sea sediments are usually heterogeneous,and their moduli of elasticity and density change as depth changes.Combined with the characteristics of deep-sea sediments,the thermo-hydro-mechanical coupling dynamic response model of heterogeneous saturated porous sediments can be established to study the influence of elastic modulus,density,frequency,and load amplitude changes on the model.Based on the Green-Lindsay generalized thermoelasticity theory and Darcy’s law,the thermo-hydro-mechanical coupled dynamic response model and governing equations of heterogeneous deep-sea sediments with nonlinear elastic modulus and density are established.The analytical solutions of dimensionless vertical displacement,vertical stress,excess pore water pressure,and temperature are obtained by means of normal modal analysis,which are depicted graphically.The results show that the changes of elastic modulus and density have few effects on vertical displacement,vertical stress,and temperature,but have great effects on excess pore water pressure.When the mining machine vibrates,the heterogeneity of deep-sea sediments has great influence on vertical displacement,vertical stress,and excess pore water pressure,but has few effects on temperature.In addition,the vertical displacement,vertical stress,and excess pore water pressure of heterogeneous deep-sea sediments change more gently.The variation trends of physical quantities for heterogeneous and homogeneous deep-sea sediments with frequency and load amplitude are basically the same.The results can provide theoretical guidance for deep-sea mining engineering construction. | Wei ZHU Xingkai MA Xinyu SHI Wenbo MA | 2023 | Applied Mathematics and Mechanics(English Edition)2023，44，4： | 0 |
| 5 | Numerical modeling of contaminant advection impact on hydrodynamic diffusion in a deformable medium显示文摘The self-weight of solid waste or machine-rolled compaction can induce or trigger contaminant migration in the landfill.Although the consolidation-induced hydraulic gradient driving solution transport has been extensively investigated,little attention has been paid to ion migration caused by its concentration gradient variation.It is necessary to more precisely predict the multi-stage contaminant transports in deforming porous material.Based on the modified Cam-clay model,the proposed fluid-solid coupled model can simulate the elastoplastic deformation behavior of layered kaolinite and KBr solution transport/sorption,and its modeling results were validated by published laboratory data.The solid-fluid interactions were analyzed by comparing various transport manners of K^(+)and Br^(−)from excess pore pressure generation to dissipation.Results reveal that the consolidation process can accelerate KBr solute advection from the contaminated layer into the uncontaminated layer,and then affects the subsequent diffusion,mechanical dispersion and sorption for K^(+)and Br^(−).The simulations also indicate that consolidation-induced solute transport is time-dependent,and therefore the ion diffusion and mechanical dispersion should receive more attention. | Chunguang Wang Shuqing Liu Xingkai Shi Guanglei Cui Hongxu Wang Xing Jin Kunkun Fan Songtao Hu | 2022 | Journal of Rock Mechanics and Geotechnical Engineering2022，14，3： | 0 |
| 6 | A Simplified Model for the Prediction of the Erosion of a Metal Screen for Sand Control显示文摘In oil drilling processes,sand production in the oil layer is a common issue,generally mitigated by means of sand control screens.To prevent or reduce the risk of damage of these screens and to improve the related service life,it is necessary to investigate the related erosion dynamics.In this study,a screen mesh model based on the flow field similarity theory is proposed to overcome the otherwise too complex geometric structure of this type of equipment.Such model is optimized using experimental data.The predicted results are in good agreement with the measured values,and the error is less than 15%.The results also show that the simplified geometric screen model and the optimized Zhang et al.erosion model have high reliability;therefore,they could effective be used to select underground screen meshes and improve the design of production process. | Baocheng Shi Ruomeng Ying Lijuan Wu Jianpeng Pan Xingkai Zhang Kai Liu Yindi Zhang | 2021 | Fluid Dynamics & Materials Processing2021，17，3： | 0 |
| 7 | Study on Temperature Distribution of Perforated Horizontal Wellbore显示文摘The temperature distribution in the wellbore under different conditions was studied by using a designed horizontal well simulation experimental device.The experimental results showed that the Joule-Thomson effect was significant in perforated wellbore.When the opening mode was the same,the larger the gas flow rate,the lower the temperature in the wellbore.Furthermore,with the increase of liquid volume,the temperature drop effect decreased gradually.The more uniform the perforation distribution,the smaller the temperature change in the wellbore.With the increase of liquid volume,the influence of gas flow rate on temperature distribution decreased.The temperature gradient caused by Joule-Thomson effect decreased with the increase of wellbore holdup.At the same time,the experimental results were compared with the theoretical values.It was found that the error of the model was within 4%,which showed the reliability of predictions of the model. | ZHANG Xingkai JIANG Ziheng LIAO Ruiquan SHI Baocheng WU Lijuan LIU Kai ZHANG Yindi | 2020 | Journal of Thermal Science2020，29，1： | 0 |
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