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How flow velocity affects the conductivity of propped coal fracture:New insights 认领 引用
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作者 RuishuaiMa Jiyuan Zhang +4 位作者 Qihong Feng Zhejun Pan Sen Wang Liang Wang Youjun Yang 《International Journal of Coal Science & Technology》 SCIE EI CAS CSCD 2026年第1期237-253,共17页
The conductivity of propped fracture in coal exerts a profound effect on the transport of coalbed methane(CBM)from low-permeable coal seams with hydraulic fracturing stimulation.Understanding the conductivity dynamics... The conductivity of propped fracture in coal exerts a profound effect on the transport of coalbed methane(CBM)from low-permeable coal seams with hydraulic fracturing stimulation.Understanding the conductivity dynamics caused by flow velocity is crucial to the accurate prediction of CBM productions and the deployment of proper development strategies.However,the changes in the conductivity and pore space of propped fracture in coal due to the movement of proppants at different flow velocities remain unclear.In this paper,online nuclear magnetic resonance(NMR)technology was first used to investigate the impact of flow velocity on the flow channels and conductivity of propped fracture in coal.Results show that the conductivity of propped fracture in coal exhibits an initial increasing and then a declining trend with increasing flow velocity velocities.It is also observed that at low flow velocities,the sensitivity of propped fracture conductivity increases with an increase in proppant concentration,size and effective stress.As a comparison,the sensitivity of propped fracture conductivity increases with increase in proppant concentration and size,but decreases as effective stress increases at high flow velocities.The T2 spectra show that the conductivity is positively correlated with the pore space of the propped fracture.The experimental results and theorical analyses suggest that the dynamics of the conductivity is due to the movement sequence of the proppant particles with different sizes that are subject to varying dragging force caused by flow velocity. 展开更多
关键词 Coalbed methane Propped fracture conductivity Velocity sensitivity Online nuclear magnetic resonance Proppant transport
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Insights into in-situ imbibition behavior of fracturing fluid in propped shale fractures based on nuclear magnetic resonance:A case study from Longmaxi Formation shale,Sichuan Basin,China 认领 引用 被引量：3
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作者 Jing-Jing Guo Kai-Xiang Di +4 位作者 Lie-Hui Zhang Yu-Long Zhao Hui-Ying Tang Rui-Han Zhang Ye Tian 《Petroleum Science》 SCIE EI CAS CSCD 2024年第1期410-429,共20页
Shale gas is an important component of unconventional oil and gas resources.Studying the imbibition behavior is helpful to optimize flowback parameters and enhance gas recovery.Recent imbibition studies have focused o... Shale gas is an important component of unconventional oil and gas resources.Studying the imbibition behavior is helpful to optimize flowback parameters and enhance gas recovery.Recent imbibition studies have focused on shale matrix,and the pressure conditions discussed were mostly atmospheric.The initial imbibition behavior begins from propped fractures to matrix,but there are few studies working on explaining the imbibition behavior in propped fractures or the phenomenon of many shale wells exhibit higher productivity after a“soaking”period.Therefore,propped fracture samples were designed for imbibition and migration experiments.In order to accurately study the mechanism and main influencing factors of fracturing fluid imbibition and migration in propped and unpropped shale fractures under high temperature and high pressure,a series of experiments based on nuclear magnetic resonance(NMR)were carried out.Results showed that NMR T2spectra of all samples exhibited a bimodal distribution.The final imbibition volume of fracturing fluid was positively related to pressure and fracture width.The imbibition effect of fracturing fluid was more evident in matrix pores under high pressure.In the migration during soaking stage,the fracturing fluid gradually migrated from large pores to small pores and gradually displaced the shale gas from the matrix,thus allowing the water blocking in propped fractures to self-unlock to some extent.Gas permeability decreased in the imbibition stage,while it recovered in the migration stage to some extent. 展开更多
关键词 Forced imbibition Migration Soaking NMR T2spectra Propped fracture Permeability recovery
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Connotation,key issues,and future development of the new-generation volume stimulation technology 认领 引用
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作者 XU Yun WENG Dingwei +8 位作者 MA Zeyuan LI Deqi CAI Bo CHEN Ming YI Xinbin FU Haifeng YANG Zhanwei LI Shuai JIANG Hao 《Petroleum Exploration and Development》 SCIE 2026年第2期512-533,共22页
This paper systematically reviews the development history and generational characteristics of multi-stage fracturing technology in horizontal wells and defines the connotation and essence of the new-generation volume ... This paper systematically reviews the development history and generational characteristics of multi-stage fracturing technology in horizontal wells and defines the connotation and essence of the new-generation volume stimulation technology,as represented by eXtreme Limited Entry(XLE).The research indicates that classical fracturing theory remains the cornerstone for optimizing stimulation designs.Optimization based on fracture units is fundamental for achieving “perfect fracturing”,while “proppant loading intensity” serves merely as a statistical parameter and therefore cannot be used to evaluate fracturing effectiveness.Consequently,expanding the stimulated volume is identified as the key to achieving optimal stimulation results.Regarding limited entry perforation strategies,the study clarifies that all clusters initiation can be achieved when the total perforation friction exceeds the horizontal in-situ stress difference among clusters.Furthermore,XLE requires a total perforation friction greater than 10 MPa,superimposed on the treating pressure at wellhead after all clusters initiation,to ensure even fluid distribution across all fractures.Based on the characteristics of “fracture swarms” observed in cores from hydraulic fracturing test sites(HFTS),it is revealed that creating a single principal fracture is critical for effective fracture propagation.Drawing on the rheological characteristics of proppant settling in slickwater and learnings from North American HFTSs,three novel viewpoints on modern fracturing are proposed:Slickwater fracturing relies on velocity for proppant transport,and subsequently injected proppant travels the furthest,suggesting that “CounterProp” is the future direction of fracturing technology;High-viscosity slickwater struggles to achieve effective proppant transport;The proppant settling mode determines that the dynamic fracture width during the treatment is effectively equal to the propped fracture width.Finally,the technical connotation and implementation pathway for “whole-domain propped” treatment are presented,and a future development vision for Autonomous Intelligent Fracturing(AIF) is proposed. 展开更多
关键词 volume stimulation extreme limited entry fracture-controlled reservoir close cutting full-domain propping perfect fracturing gas suspension CounterProp propped fracture width
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Influence of disturbance degree on the propped excavation stability in sandy soil in Shenyang,China 认领 引用 被引量：1
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作者 Jiachao Dong Chen Chen +3 位作者 Manman Dong Bo Lu Yongping Guan Wen Zhao 《Underground Space》 SCIE EI CSCD 2023年第3期150-165,共16页
The stability of deep excavation is often investigated through numerical simulation.However,most constitutive models cannot take into account the influence of disturbance on soil response,especially for excavations in... The stability of deep excavation is often investigated through numerical simulation.However,most constitutive models cannot take into account the influence of disturbance on soil response,especially for excavations in sandy soils.In this study,the conventional Dun-can–Chang constitutive model is modified based on the data obtained from a series of triaxial consolidated drained tests on medium coarse sand with different relative densities,where all input parameters in the model are correlated with the changes in relative density due to disturbance.The modified hyperbolic model is then implemented in the general-purpose finite element code,ABAQUS.The effi-ciency of the proposed constitutive mode is demonstrated by comparing with the experimental data.Furthermore,a case study of a large-scale propped excavation for a subway station in Shenyang is analyzed through numerical calculations with the conventional Mohr–Cou-lomb model and the proposed hyperbolic model,and theoretical derivations based on the current technical code in China.It is found that the proposed approach can provide reasonable estimations compared with field measurements with a maximum error of 28%for max-imum horizontal displacement of the solider pile and of 8%for maximum ground surface settlement,whereas the other techniques over-estimate the behaviour of deep excavation significantly by more than 90%. 展开更多
关键词 Propped excavation Triaxial tests Constitutive model Disturbance degree Numerical analysis
Synergistic Regulation of Na+ Solvation Structure and Interfacial Chemistry Enabled by a Bifunctional Sultone Additive for High-Voltage Sodium Metal Batteries 认领 引用
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作者 Xingyu Yang Yan Lai +8 位作者 Xiao Yan Qihui Wang Shuqing Ma Yu Miao Jiayi Xu Qipeng Zhang Yaru Qin Chenglong Shi Jianmin Ma 《Rare Metals》 SCIE EI CAS CSCD 2026年第4期800-809,共10页
Sodium metal batteries(SMBs)are regarded as promising candidates for next‑generation energy storage systems owing to their high theoretical energy density and low cost.However,their practical development is hindered b... Sodium metal batteries(SMBs)are regarded as promising candidates for next‑generation energy storage systems owing to their high theoretical energy density and low cost.However,their practical development is hindered by the instability of the electrode‑electrolyte interphase(EEI),particularly under high‑voltage operation.Herein,we investigate the interfacial regulation mechanism of the bifunctional additive prop‑1‑ene‑1,3‑sultone(PES)in high‑voltage SMBs by employing Na metal‖NaNi1/3Fe1/3Mn1/3O2(NFM)full cells.Theoretical calculations and molecular dynamics simulations reveal that PES molecules preferentially undergo reduction and oxidation at the Na metal anode and NFM cathode interfaces,respectively,owing to their low LUMO and high HOMO energy levels.Furthermore,the highly polar sultone ring of PES can penetrate the primary Na+solvation sheath,enhance PF6-‑coordination in the inner solvation structure,and promote the formation of an inorganic‑rich EEI enriched in NaF and NaxSOyspecies.Consequently,batteries employing an electrolyte containing 1 wt%PES deliver a capacity retention of 82.5%after 300 cycles between 2.0 and 4.3 V,accompanied by an average Coulombic efficiency of 99.88%.Even at a high cut‑off voltage of 4.4 V,the capacity retention remains 80%after 150 cycles.This work provides a mechanistic understanding that may guide the rational design of electrolytes for high‑voltage SMBs based on synergistic solvation‑structure regulation and interfacial‑chemistry optimization. 展开更多
关键词 Electrode‑electrolyte interphase high‑voltage electrolytes prop‑1‑ene‑1,3‑sultone sodium metal batteries
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Employment of Theme Props by Pu Songling in His Liao Zhai Zhi Yi 认领 引用
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作者 QIAO Yuxue ZHAO Chengxin 《Journal of Literature and Art Studies》 2026年第3期179-184,共6页
The creative application of“theme props”by Pu Songling in Liao Zhai Zhi Yi achieved significant artistic effects.Classical Chinese fiction has long employed“theme props”to drive plot design,and Pu Songling further... The creative application of“theme props”by Pu Songling in Liao Zhai Zhi Yi achieved significant artistic effects.Classical Chinese fiction has long employed“theme props”to drive plot design,and Pu Songling further advanced this tradition by deepening the narrative through three typical methods:first,imbuing props with symbolic meanings and profound metaphors;second,using props as keys to resolve conflicts;third,employing props as mediums for plot twists and character relationships.Though seemingly minor,these props are closely linked to the core traits of characters,the development of the plot,and the trajectory of fate,resulting in compact story structures and clear narrative focus.This demonstrates Pu Songling’s mastery and innovative development of traditional narrative techniques. 展开更多
关键词 Pu Songling Liao Zhai Zhi Yi theme props narrative technique plot design symbolic metaphor
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Determination of support mechanical mechanism of pre-stressed expandable props to stope roof in room-and-pillar mining 认领 引用
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作者 LI Kun-meng WANG Yong-jiang +3 位作者 LIU Kai LI Yuan-hui FU Zheng-chun PANG Bo-xue 《Journal of Central South University》 SCIE EI CAS CSCD 2025年第9期3539-3556,共18页
This study is to determine the support mechanism of pre-stressed expandable props for the stope roof in room- and-pillar mining, which is crucial for maintaining stability and preventing roof collapse in mines. Utiliz... This study is to determine the support mechanism of pre-stressed expandable props for the stope roof in room- and-pillar mining, which is crucial for maintaining stability and preventing roof collapse in mines. Utilizing an engineering case from a gold mine in Dandong, China, a laboratory-based similar test is conducted to extract the actual roof characteristic curve. This test continues until the mining stope collapses due to a U-shaped failure. Concurrently, a semi-theoretical method for obtaining the roof characteristic curve is proposed and verified against the actual curve. The semi-theoretical method calculated that the support force and vertical displacement at the demarcation point between the elastic and plastic zones of the roof characteristic curve are 5.0 MPa and 8.20 mm, respectively, corroborating well with the laboratory-based similar test results of 0.22 MPa and 0.730 mm. The weakening factor for the plastic zone in the roof characteristic curve was semi-theoretically estimated to be 0.75. The intersection between the actual roof characteristic curve and the support characteristic curves of expandable props, natural pillars, and concrete props indicates that the expandable prop is the most effective “yielding support” for the stope roof in room-and-pillar mining. That is, the deformation and failure of the stope roof can be effectively controlled with proper release of roof stress. This study provides practical insights for optimizing support strategies in room-and-pillar mining, enhancing the safety and efficiency of mining operations. 展开更多
关键词 expandable prop room-and-pillar mining complex variable function roof characteristic curve support characteristic curve yielding support
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An optimization model for conductivity of hydraulic fracture networks in the Longmaxi shale,Sichuan basin,Southwest China 认领 引用 被引量：8
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作者 Zhihong Zhao Kaidi Wu +3 位作者 Yu Fan Jianchun Guo Bo Zeng Wenhan Yue 《Energy Geoscience》 EI 2020年第1期47-54,共8页
Shale gas is an important unconventional resource.The economic recovery of shale gas is only possible when a fracture network with sufficient conductivity is created by hydraulic fracturing,that,if effectively propped... Shale gas is an important unconventional resource.The economic recovery of shale gas is only possible when a fracture network with sufficient conductivity is created by hydraulic fracturing,that,if effectively propped,connects fracturing fractures and natural fractures.Focusing on the Longmaxi shale in the Sichuan Basin,Southwest China,we built an optimization model for conductivity of multi-grade fractures based on equivalent seepage theory.We then experimentally analyzed the conductivity of self-propped and sand-propped fractures,and optimized the propping patterns of multi-grade hydraulic fractures in shale gas reservoirs.We concluded that the propping effectiveness of fracture networks could be improved by using low concentrations of small-sized sands and by focusing on creating a large number of self-propped fractures.By applying this understanding to the optimization of fracturing designs for the Longmaxi shale,we successfully created networks of well-propped fractures. 展开更多
关键词 Fracture network Conductivity optimization Propped fracture Self-propped fracture Shale gas
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Fun at a Self-Photo Studio! 认领 引用
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作者 Ruth Devlin 《空中英语教室（初级版．大家说英语）》 2025年第6期46-47,56,共2页
Are you tred of regular selfies?Try a self-photo studio!The lights and camera are ready for you.At the studio,you can fix your hair.There are clothes and props.You can use those and take fun photos.Bring your friends ... Are you tred of regular selfies?Try a self-photo studio!The lights and camera are ready for you.At the studio,you can fix your hair.There are clothes and props.You can use those and take fun photos.Bring your friends with you.Then you can take photos together.Pose in silly ways and have fun!You can take the photos home and remember your good time. 展开更多
关键词 camera clothes hair fixing selfies lights fun photos props self photo studio
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MC4R和PROP1基因多态性及合并基因型与中国美利奴羊生长性状的关联分析 认领 引用 被引量：16
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作者 曾献存 陈韩英 +5 位作者 贾斌 赵宗胜 惠文巧 张文祥 吴洪宾 王尊宝 《畜牧兽医学报》 CAS CSCD 北大核心 2011年第9期1227-1232,共6页
为了探讨MC4R和PROP1基因作为绵羊生长性状候选基因的可能性,寻找与绵羊生长性状相关的分子标记。本研究采用PCR-SSCP方法检测中国美利奴羊和德国美利奴羊MC4R和PROP1基因的多态性,分析了多态位点不同基因型及合并基因型与中国美利奴羊... 为了探讨MC4R和PROP1基因作为绵羊生长性状候选基因的可能性,寻找与绵羊生长性状相关的分子标记。本研究采用PCR-SSCP方法检测中国美利奴羊和德国美利奴羊MC4R和PROP1基因的多态性,分析了多态位点不同基因型及合并基因型与中国美利奴羊生长性状的关联性。结果表明:MC4R基因MC4R-3位点存在G894C突变,MC4R-4位点3′侧翼区存在A1223G、G1229A和T1307G3个突变位点;PROP1基因在外显子3上存在A2660G突变,导致Thr181Ala改变。关联分析表明,在中国美利奴羊群体中,MC4R-4位点不同基因型个体体斜长和腰角宽差异显著(P<0.05),优良基因型为BB;PROP1基因不同基因型个体尻宽和胸围差异显著(P<0.05),优良基因型为BB;PROP1-MC4R-4优良基因型聚合体BB-BB个体体斜长高于其它合并基因型个体(P<0.05)。结果提示绵羊MC4R和PROP1基因单核苷酸多态性及合并基因型对中国美利奴羊生长性状有一定的影响,可以作为进行绵羊生长性状分子标记辅助选择的候选基因。 展开更多
关键词 绵羊 MC4R基因 PROP1基因 合并基因型 生长性状
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Determination of the load bearing capacity of pre-stressed expandable props for ground support in underground mines 认领 引用 被引量：8
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作者 Kunmeng Li Kaiyuan Jiang +3 位作者 Yuanhui Li Xin Wang Kai Liu Shuai Xu 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2023年第8期977-990,共14页
This paper aims to determine the load bearing capacity of pre-stressed expandable props with different geometries and load eccentricities for flexible support in underground mining or excavation.It is deduced that the... This paper aims to determine the load bearing capacity of pre-stressed expandable props with different geometries and load eccentricities for flexible support in underground mining or excavation.It is deduced that the expandable device could have much higher strength(>89 MPa)by laboratory tests,and the load bearing capacity of the expandable prop may depend on the stability of the supporting steel pipe structure.A good agreement was found between the laboratory test and numerical results in terms of the load bearing capacity and the final macro-bending failure pattern for expandable props with heights of 1.5 and 2.7 m,and the theoretical calculation for the strength of traditional steel structures is not directly suitable for the expandable props.Moreover,additional numerical simulations were performed for the expandable props with different normalized slenderness ratiosλnand loading eccentric distances e.The variation of stability coefficient of the expandable prop is in line with the Perry-Robertson equation and its correlation coefficients are fitted as a of 0.979 and b of 0.314.For estimating the load bearing capacity of the expandable props,the strength equation for traditional steel structures is improved by introducing a bending magnification factor and by modifying the normalized slenderness ratio to a converted slenderness ratio.Based on the underground field monitoring for the strength of expandable props with different heights,the empirical eccentric distances were back calculated,and a safety factor is introduced to obtain the designed strength of the expandable prop.In addition,a four-step design procedure is proposed for the expandable prop. 展开更多
关键词 Pillar stability Load bearing capacity Expandable prop Slenderness ratio Eccentric distance
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Numerical modeling on strain energy evolution in rock system interaction with energy-absorbing prop and rock bolt 认领 引用 被引量：10
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作者 Yang Hao Chunhui Liu +4 位作者 Yu Wu Hai Pu Yanlong Chen Lingling Shen Guichen Li 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2023年第10期1273-1288,共16页
The interaction mechanism between coal and rock masses with supporting materials is significant in roadway control, especially in deep underground mining situations where dynamic hazards frequently happened due to hig... The interaction mechanism between coal and rock masses with supporting materials is significant in roadway control, especially in deep underground mining situations where dynamic hazards frequently happened due to high geo-stress and strong disturbed effects. This paper is to investigate the strain energy evolution in the interaction between coal and rock masses with self-designed energy-absorbing props and rock bolts by numerical modeling with the finite difference method. The interaction between rock and rock bolt/prop is accomplished by the cables element and the interface between the inner and outer props. Roadway excavation and coal extraction conditions in deep mining are numerically employed to investigate deformation, plastic zone ranges, strain energy input, accumulation, dissipation,and release. The effect on strain energy input, accumulation, dissipation, and release with rock deformation, and the plastic zone is addressed. A ratio of strain energy accumulation, dissipation, and release with energy input a, β, γ is to assess the dynamic hazards. The effects on roadway excavation and coal extraction steps of a, β, γ are discussed. The results show that:(1) In deep high geo-stress roadways, the energyabsorbing support system plays a dual role in resisting deformation and reducing the scope of plastic zones in surrounding rock, as well as absorbing energy release in the surrounding rock, especially in the coal extraction state to mitigate disturbed effects.(2) The strain energy input, accumulation is dependent on roadway deformation, the strain energy dissipation is relied on plastic zone area and disturbed effects, and strain energy release density is the difference among the three. The function of energyabsorbing rock bolts and props play a key role to mitigate strain energy release density and amount, especially in coal extraction condition, with a peak density value from 4×104 to 1×104J/m3, and amount value from 3.57×108 to 1.90×106J.(3) When mining is advanced in small steps, the strain energy accumulation is dominated. While in a large step, the released energy is dominant, thus a more dynamic hazards proneness. The energy-absorbing rock bolt and prop can reduce three times strain energy release amount, thus reducing the dynamic hazards. The results suggest that energy-absorbing props and rock bolts can effectively reduce the strain energy in the coal and rock masses, and prevent rock bursts and other hazards.The numerical model developed in this study can also be used to optimize the design of energyabsorbing props and rock bolts for specific mining conditions. 展开更多
关键词 Strain energy Coal and rock mass Energy-absorbing prop and rock bolt Strain energy evolution
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Correlation between microstructure and mechanical properties of columnar crystals in the directionally solidified Mg-Gd-Y-Er alloy 认领 引用 被引量：5
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作者 D.R.Fang S.S.Zhao +4 位作者 X.P.Lin T.Chai Y.Kuo H.Sun Y.Dong 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2022年第3期806-818,共13页
The Mg-4.58Gd-0.45Y-0.01 Er alloys with different volume fractions of columnar crystals in hard orientation(orientation factor ofbasal plane slip system is less than 0.2)were prepared by changing the pulling rate to r... The Mg-4.58Gd-0.45Y-0.01 Er alloys with different volume fractions of columnar crystals in hard orientation(orientation factor ofbasal plane slip system is less than 0.2)were prepared by changing the pulling rate to regulate the crystal growth orientation.Tensile tests were performed on the Mg-4.58Gd-0.45Y-0.01 Er alloy at room temperature,and the structure after deformation was investigated by electron backscatter diffraction(EBSD).Subsequently,the strengthening mechanism of columnar crystals in hard orientation was explored.The results show if orientation factors ofbasal plane slip system of columnar crystals are all greater than 0.4(soft orientation),the alloy has low yield strength σs(64 MPa),but great work hardening ability,and ultimate tensile strength σb and elongationδare 114 MPa and 37.3%,respectively.If orientation factors ofbasal plane slip system of columnar crystals are all less than 0.2(hard orientation),the alloy has high strength(σs,125 MPa),but poor plasticity(δ,6.32%).If the"hard orientation"and the"soft orientation"columnar crystals are arranged alternately along the direction perpendicular to the crystal growth,the alloy has both superior strength(σs,102 MPa)and excellent plasticity(δ,22.5%)at room temperature.The improved comprehensive mechanical property can be attributed to two factors.On the one hand,the"hard orientation"columnar crystals can prevent the"soft orientation"crystals deforming,so the strength is improved.On the other hand,the"hard orientation"columnar crystals themselves can withstand a certain amount of deformation to retain appropriate plasticity. 展开更多
关键词 Directional solidification Mg-Gd-Y-Er alloy Hard orientation Mechanical prop
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中国美利奴羊PROP1和PRLR基因的表达分析 认领 引用 被引量：6
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作者 曾献存 陈韩英 +3 位作者 贾斌 赵宗胜 惠文巧 王尊宝 《畜牧兽医学报》 CAS CSCD 北大核心 2011年第8期1057-1062,共6页
本研究旨在探讨PROP1和PRLR基因在绵羊不同组织中的表达差异及其发育变化规律。利用荧光实时定量PCR技术分析了PROP1和PRLR基因在中国美利奴成年母羊13种组织中的表达谱信息,并检测了垂体组织中PROP1基因和垂体、卵巢、睾丸和皮肤组织中... 本研究旨在探讨PROP1和PRLR基因在绵羊不同组织中的表达差异及其发育变化规律。利用荧光实时定量PCR技术分析了PROP1和PRLR基因在中国美利奴成年母羊13种组织中的表达谱信息,并检测了垂体组织中PROP1基因和垂体、卵巢、睾丸和皮肤组织中PRLR基因在0、7、14、30、60和90日龄时表达水平的发育变化。结果表明:PROP1基因仅在绵羊垂体组织中表达;而PRLR基因在绵羊各种组织中广泛表达,且在子宫和下丘脑组织中的表达量高于其它组织(P0.05);在卵巢组织中从7日龄起呈先下降后上升的趋势,90日龄高于0(P<0.01)、14和30日龄(P<0.05);在睾丸组织中总体呈上升趋势;在皮肤组织中呈现为生长前期高于后期的趋势(P<0.01)。绵羊PROP1和PRLR基因表达存在明显的组织表达差异和发育变化差异;PROP1和PRLR基因的表达可能对绵羊繁殖等性状的发育有一定的调节作用。 展开更多
关键词 中国美利奴羊 PROP1基因 PRLR基因 荧光实时定量PCR 组织表达谱 发育变化
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Coupled THMC model‑based prediction of hydraulic fracture geometry and size under self‑propping phase‑transition fracturing 认领 引用 被引量：4
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作者 Nanlin Zhang Fushen Liu +4 位作者 Liangliang Jiang Pinqiang Mo Jingwen Xiao Qi Song Yuhao Luo 《International Journal of Coal Science & Technology》 EI CAS CSCD 2024年第6期29-53,共25页
The Self-Propping Phase-transition Fracturing Technology(SPFT)represents a novel and environmentally friendly approach for a cost-effective and efficient development of the world’s abundant unconventional resources,e... The Self-Propping Phase-transition Fracturing Technology(SPFT)represents a novel and environmentally friendly approach for a cost-effective and efficient development of the world’s abundant unconventional resources,especially in the context of a carbon-constrained sustainable future.SPFT involves the coupling of Thermal,Hydraulic,Mechanical,and Chemical(THMC)fields,which makes it challenging to understand the mechanism and path of hydraulic fracture propagation.This study addresses these challenges by developing a set of THMC multifield coupling models based on SPFT parameters and the physical/chemical characteristics of the Phase-transition Fracturing Fluid System(PFFS).An algorithm,integrating the Finite Element Method,Discretized Virtual Internal Bonds,and Element Partition Method(FEM-DVIB-EPM),is proposed and validated through a case study.The results demonstrate that the FEM-DVIB-EPM coupling algorithm reduces complexity and enhances solving efficiency.The length of the hydraulic fracture increases with the quantity and displacement of PFFS,and excessive displacement may result in uncontrolled fracture height.Within the parameters considered,a minimal difference in fracture length is observed when the PFFS amount exceeds 130 m3,that means the fracture length tends to stabilize.This study contributes to understanding the hydraulic fracture propagation mechanism induced by SPFT,offering insights for optimizing hydraulic fracturing technology and treatment parameters. 展开更多
关键词 Sustainable development,Self Propping phase Transition fracturing technology,Thermal Hydraulic Mechanical Chemical coupling,FEM DVIB EPM,Hydraulic fracture propagation
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Chemical Recycling of Poly(ethylene furanoate)into Value-added Poly(ethylene-co-isosorbide furanoate) 认领 引用 被引量：2
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作者 Jing Li Sheng Wang +3 位作者 Huan-Jun Lu Ying-Jia Lan Xiao-Hong Li Ying-Feng Tu 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2023年第10期1533-1542,共10页
We present here a novel strategy for the chemical recycling of bio-based poly(ethylene furanoate)s(PEF)to value-added high-performance bio-based poly(ethylene-co-isosorbide furanoate)(PEIF)copolyesters by the combinat... We present here a novel strategy for the chemical recycling of bio-based poly(ethylene furanoate)s(PEF)to value-added high-performance bio-based poly(ethylene-co-isosorbide furanoate)(PEIF)copolyesters by the combination of cyclodepolymerization method with rapid cascade polycondensation-coupling ring-opening polymerization(PROP).The solution cyclodepolymerization of commercially available PEF affords cyclic oligo(ethylene 2,5-furandicarboxylate)s(COEFs),and the effects of reaction conditions on the yield of COEFs were studied.PEIF copolyesters with different isosorbide(IS)contents were synthesized via the cascade PROP of COEFs with IS,which show significant enhanced glass transition temperature.By melt spinning,PEIF fibers with different orientation factors were prepared,with excellent thermal stability and mechanical performance.The obtained PEIF fibers can lift a weight∼25000 times higher than its weight.The PEIF fibers are stable under ambient conditions but are biodegradable following the“surface erosion”mechanism.These sustainable value-added biodegradable PEIF fibers offer a solution to the environmentally friendly fibers. 展开更多
关键词 Bio-based Chemical recycling Fiber PROP Sustainable
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Analysis and application in controlling surrounding rock of support reinforced roadway in gob-side entry with fully mechanized mining 认领 引用 被引量：11
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作者 DENG Yuehua TANG Jianxin +2 位作者 ZHU Xiangke FU Yong DAI Zhangyin 《Mining Science and Technology》 2010年第6期839-845,共7页
In order to optimize gob-side entry in fully-mechanized working face in moderate-thick-coal seams, we adopt a new attempt to pack roadside by pumping ordinary concrete, which is very important for the development of g... In order to optimize gob-side entry in fully-mechanized working face in moderate-thick-coal seams, we adopt a new attempt to pack roadside by pumping ordinary concrete, which is very important for the development of gob-side entry technology. The concrete has a long initial setting time and a low initial strength. So it is difficult to control the surrounding rock. In this paper, we analyze the effect of using roadside cable to reinforce supporting in gob-side entry surrounding rock controlling based on elas-tic-plastic and material mechanics knowledge. And then we propose a scheme that cable is used to reinforce roadside supporting and a single hydraulic prop is used as the temporary supporting in gob side. Using the numerical simulation software FLAC2D, we numerically simulated supporting scheme. Results of both the 2D modeling and the industrial test on No.3117 face in Jingang Mine prove that the scheme is feasible. The results show that the technology of protecting the roadway in gob-entry retained efficiently make up the deficiency of roadside packing with ordinary concrete, effectively control the roof strata and acquire a good result of retaining roadway. 展开更多
关键词 gob-side entry retained surrounding rock controlling cable reinforced roadside supporting FLAC2D single hydraulic prop roadside support pumping of concrete
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Role of Rare Earth in Low Sulphur Nb-Ti-Bearing Steel 认领 引用 被引量：6
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作者 朱兴元 林勤 +3 位作者 曾静 刘继雄 高平祥 王跃华 《Journal of Rare Earths》 SCIE EI CAS 2003年第1期81-85,共5页
The effect of rare earth on the microstructures, mechanical properties and inclu sions in low sulphur Nb-Ti-bearing steel were investigated. It is shown that t h e transverse yield point, the traverse tensile strength... The effect of rare earth on the microstructures, mechanical properties and inclu sions in low sulphur Nb-Ti-bearing steel were investigated. It is shown that t h e transverse yield point, the traverse tensile strength and elongation of testin g steels decrease initially and then rise with increasing content of rare earth. The impact energy values of the testing steels exhibit a contrary trend. Proper amount of rare earth in the steels can improve the anisotropy of impact toughne ss above -20 ℃ and it does not affect the type of microstructures which ar e st ill composed of ferrites and pearlites, but the pearlite amount increases. On one hand, rare earth cleans the molten steel and reduces the amount of inclusions; on the other hand, rare earth makes the inclusions spheroidizd, refi ned and dispersed, and thus improves the distribution of inclusions. 展开更多
关键词 metal materials Nb-Ti-bearing steel prop erty microstructure inclusion rare earths
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硫代磷酸反义寡核苷酸prop5对流感病毒进入细胞的抑制作用 认领 引用 被引量：1
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作者 李康 齐向云 +3 位作者 李庆平 夏燕平 杨静 王升启 《国际药学研究杂志》 CSCD 2014年第1期102-107,117,共6页
目的研究硫代磷酸反义寡核苷酸prop5对流感病毒感染进入细胞的影响。方法采用流感病毒感染A549细胞模型,设立随机序列(prop5R)和正义序列(prop5S)作为阴性对照,收集细胞培养液,采用实时荧光定量PCR检测病毒RNA拷贝数,评价反义寡核苷酸... 目的研究硫代磷酸反义寡核苷酸prop5对流感病毒感染进入细胞的影响。方法采用流感病毒感染A549细胞模型,设立随机序列(prop5R)和正义序列(prop5S)作为阴性对照,收集细胞培养液,采用实时荧光定量PCR检测病毒RNA拷贝数,评价反义寡核苷酸对病毒吸附和进入的影响;进一步通过血凝抑制实验检测prop5对流感病毒吸附细胞的影响,溶血抑制实验检测prop5对流感病毒进入细胞的影响。结果 prop5能够抑制流感病毒A/Jingfang/1/86(H1N1)感染A549细胞,对流感病毒吸附细胞过程没有影响,prop5能够抑制A/Jingfang/1/86(H1N1)、A/Lufang/9/93(H3N2)、A/FM/1/47(H1N1)和A/PR/8/34(H1N1)介导的膜融合。结论 prop5能抑制流感病毒进入细胞,这种额外的活性增强了prop5的抗病毒能力。 展开更多
关键词 硫代磷酸反义寡核苷酸 prop5 流感病毒 感染
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Prevention and forecasting of rock burst hazards in coal mines 认领 引用 被引量：45
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作者 DOU Lin-ming LU Cai-ping MU Zong-long GAO Ming-shi 《Mining Science and Technology》 2009年第5期585-591,共7页
Rock bursts signify extreme behavior in coal mine strata and severely threaten the safety of the lives of miners, as well as the effectiveness and productivity of miners. In our study, an elastic-plastic-brittle model... Rock bursts signify extreme behavior in coal mine strata and severely threaten the safety of the lives of miners, as well as the effectiveness and productivity of miners. In our study, an elastic-plastic-brittle model for the deformation and failure of coalock was established through theoretical analyses, laboratory experiments and field testing, simulation and other means, which perfectly predict sudden and delayed rock bursts. Based on electromagnetic emission (EME), acoustic emission (AE) and microseism (MS) effects in the process from deformation until impact rupture of coal-rock combination samples, a multi-parameter identification of premonitory technology was formed, largely depending on these three forms of emission. Thus a system of classification for forecasting rock bursts in space and time was established. We have presented the intensity weakening theory for rock bursts and a strong-soft-strong (3S) structural model for controlling the impact on rock surrounding roadways, with the objective of laying a theoretical foundation and establishing references for parameters for the weakening control of rock bursts. For the purpose of prevention, key technical parameters of directional hydraulic fracturing are revealed. Based on these results, as well as those from deep-hole controlled blasting in coal seams and rock, integrated control techniques were established and anti-impact hydraulic props, suitable for roadways subject to hazards from rockbursts have also been developed. These technologies have been widely used in most coal mines in China, subject to these hazards and have achieved remarkable economic and social benefits. 展开更多
关键词 rock bursts elastic-plastic-brittle model multi-parameter premonitory intensity weakening strong-soft-strong （3S） structure directional hydraulic fracturing anti-impact hydraulic prop
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