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Effects of aggregate size distribution and carbon nanotubes on the mechanical properties of cemented gangue backfill samples under true triaxial compression

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 311-324页

作者： Qian Yin Fan Wen Zhigang Tao Hai Pu Tianci Deng Yaoyao meng Qingbin meng Hongwen Jing bo meng Jiangyu Wu State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainan 232001China State Key Laboratory for Geomechanics&Deep Underground Engineering China University of Mining and Technology(Beijing)Beijing 100083China Key Laboratory of Xinjiang Coal Resources Green Mining Ministry of EducationXinjiang Institute of EngineeringUrumqi 830023China

The mechanical behavior of cemented gangue backfill materials(CGBMs)is closely related to particle size distribution(PSD)of aggregates and properties of cementitious ***,the true triaxial compression tests,CT scanning,SEM,and EDS tests were conducted on cemented gangue backfill samples(CGBSs)with various carbon nanotube concentrations(P_(CNT))that satisfied fractal theory for the PSD of *** mechanical properties,energy dissipations,and failure mechanisms of the CGBSs under true triaxial compression were systematically *** results indicate that appropriate carbon nanotubes(CNTs)effectively enhance the mechanical properties and energy dissipations of CGBSs through micropore filling and microcrack bridging,and the optimal effect appears at P_(CNT)of 0.08wt%.Taking PSD fractal dimension(D)of 2.500 as an example,compared to that of CGBS without CNT,the peak strength(σ_(p)),axial peak strain(ε_(1,p)),elastic strain energy(Ue),and dissipated energy(U_(d))increased by 12.76%,29.60%,19.05%,and90.39%,***,excessive CNTs can reduce the mechanical properties of CGBSs due to CNT agglomeration,manifesting a decrease inρ_(p),ε_(1,p),and the volumetric strain increment(Δε_(v))when P_(CNT)increases from 0.08wt%to 0.12wt%.Moreover,the addition of CNTs improved the integrity of CGBS after macroscopic failure,and crack extension in CGBSs appeared in two modes:detour and pass through the ***σ_(p)and U_(d)firstly increase and then decrease with increasing D,and porosity shows the opposite ***ε_(1,p)andΔε_(v)are negatively correlated with D,and CGBS with D=2.150 has the maximum deformation parameters(ε_(1,p)=0.05079,Δε_(v)=0.01990)due to the frictional slip effect caused by coarse *** increasing D,the failure modes of CGBSs are sequentially manifested as oblique shear failure,"Y-shaped"shear failure,and conjugate shear failure.

关键词： cemented gangue backfill materials particle size distribution true triaxial compression test carbon nanotubes mechanical properties failure modes

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Three-dimensional numerical study of supercritical pressure effect on heat transfer of cryogenic methane

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航空动力学报 2011年第7期26卷 1480-1487页

作者： RUAN bo meng Hua School of Aeronautics and Astronautics Zhejiang University Hangzhou 310027 China)

A three-dimensional numerical study of the turbulent convective heat transfer of the cryogenic methane flowing inside a square engine cooling channel under supercritical pressures was systematically *** results indicate that increasing the fluid pressure results in enhanced heat transfer of the cryogenic methane under supercritical *** the pseudo-critical temperature under a corresponding supercritical pressure,drastic property variations cause heat transfer deterioration and sharp wall temperature increase at a high wall heat flux of 7MW/m2.A modified Jackson and Hall heat transfer equation,which can be used for supercritical heat transfer calculations of the cryogenic methane,has been successfully established in this paper.

关键词： supercritical heat transfer supercritical pressure regenerative cooling cryogenic methane numerical study

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Surface modifications of layered LiNi_(x)Mn_(y)Co_(z)O_(2)cathodes via atomic and molecular layer deposition

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Rare Metals 2023年第7期42卷 2121-2156页

作者： Xin Wang Xiang-bo meng Department of Mechanical Engineering University of ArkansasFayettevilleAR72701USA

Currently,there has an ever-growing interest in layered LiNi_(x)Mn_(y)Co_(z)O_(2)(NMCs,x+y+z=1)cathode materials for lithium-ion batteries(LIBs)and lithium metal batteries(LMBs),due to their low cost and high ***,they still suffer from a series of issues,such as Li/Ni cation mixing,irreversible phase transition,and transition metal *** issues result in severe capacity degradation and limited cyclability of ***,atomic and molecular layer deposition(ALD and MLD)have emerged as a novel tool to tackle these issues,featuring their unique capabilities to fine-tailor NMCs'surfaces for stable interfaces and improved electrochemical performance in LIBs and *** this review,we specially summarize the recent advances of different ALD and MLD coatings on NMCs and discuss their working *** expect that this review will stimulate more efforts to further develop better NMCs using novel ALD/MLD coatings.

关键词： Lithium-ion batteries(LIBs) Lithium metal batteries(LMBs) NMC cathodes Atomic layer deposition(ALD) Molecular layer deposition(MLD) Surface coating

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Translocation of polymer through nanopore:dissipative particle dynamics simulation

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Chinese Science Bulletin 2014年第35期59卷 4960-4967页

作者： meng-bo Luo Department of Physics Zhejiang University

Dissipative particle dynamics simulations are performed to study the forced translocation of polymer through a nanopore inside which the polymer experiences a driving force *** interaction(HI) is taken into account for the polymer in good *** find that the mean translocation timescales with the polymer length N as～Nx with a = 1.26 ± 0.03 close to a theoretical prediction,and the probability distribution of s can be described by a Gaussian *** results show that the dynamics of polymer translocation with the HI is different from that without the ***,the exponent d in the scaling～δ F-dis found not to be affected by the HI effect.

关键词：动力学模拟聚合物纳米孔粒子耗散易位动力学相互作用 Tgt

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The impact of regulatory and financial discrimination on China's low-carbon development:Considering firm heterogeneity

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Advances in Climate Change Research 2020年第2期11卷 72-84页

作者： TANG Wei-Qi meng bo WU Li-bo CIB Research Shanghai200120China Center for Energy Economics and Strategy Studies Fudan UniversityShanghai200433China Institute of Developing Economies–JETRO Chiba2618545Japan Tokyo Foundation for Policy Research Tokyo1066234Japan School of Economics Fudan UniversityShanghai200433China

Firms in China within the same industry but with different ownership and size have different production functions and face different emission regulations and financial conditions,thus can give very different responses to environmental *** fact has been largely ignored in most of the low-carbon development related *** an augmented Chinese input–output table in which information about firm size(large-and small and medium-sized firms)and ownership(state-,foreign-,and private-owned firms)are explicitly reported,a dynamic computable general equilibrium model is developed in this study to analyze the impact of alternative low-carbon policy designs with different regulatory coverage and financial equalization on heterogeneous *** simulation results show that,with the fully balanced regulation coverage and equalized financial system for heterogeneous firms,the total green investment accounts for 4%of GDP in 2030 for fulfilling China's commitment to reduce carbon emissions,which is the lowest among the various scenarios;about one-third of this investment is made by small and private firms;at the same time,green investment efficiency will be the highest,about 84%higher than that of the business-as-usual ***,a market-oriented and new technology-driven arrangement and mechanism for sharing emission reduction burden and allocating green investment across heterogeneous firms,especially to small and medium-sized firms,is crucial for China to achieve a more ambitious emission target in the long run.

关键词： Small-and medium-sized enterprise(SME) Green finance Firm heterogeneity ETS CO2 emissions Low-carbon Chinese economy

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Necessary and sufficient conditions for normalization and sliding mode control of singular fractional-order systems with uncertainties

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Science China(Information Sciences) 2020年第5期63卷 187-196页

作者： bo meng Xinhe WANG Ziye ZHANG Zhen WANG College of Mathematics and Systems Science Shandong University of Science and Technology

The sliding mode control(SMC) problem for a normalized singular fractional-order system(SFOS) with matched uncertainties was investigated. Firstly, SFOS was normalized under constrained conditions. Then, the linear sliding mode(SM) function was designed using a fractional-order(FO) positive definite matrix and a linear matrix inequality(LMI). The SM controller was subsequently constructed based on switching laws. Finally, the feasibility of the method was evaluated using a numerical example.

关键词： sliding mode control normalization fractional-order positive definite matrix singular fractional-order systems uncertainties

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Catalyst-modified perovskite hollow fiber membrane for oxidative coupling of methane

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Chinese Journal of Chemical Engineering 2022年第1期35卷 412-419页

作者： Jian Song Claudia Li Shao Zhang Xiuxia meng bo meng Jaka Sunarso Department of Chemical Engineering Shandong University of TechnologyZibo 255049China State Key Laboratory of Separation Membranes and Membrane Processes Department of Chemical EngineeringTiangong UniversityTianjin 300387China Research Centre for Sustainable Technologies Faculty of EngineeringComputing and ScienceSwinburne University of TechnologyJalan Simpang Tiga93350 KuchingSarawakMalaysia

The catalytic oxidative cou pling of methane(OCM)to C_(2) hydrocarbons(C_(2)H_(6) and C_(2)H_(4))represents one of the most effective ways to convert natural gas to more useful products,which can be performed effectively using La_(0.6)Sr0.4Co_(0.2)Fe_(0.8)O_(3-δ)(LSCF)perovskite hollow fiber membrane *** this work,the effects of adding a thin BaCe_(0.8)Gd_(0.2)O_(3-δ)(BCG)catalyst film onto the inner LSCF fiber surface as the OCM catalyst and a porous Ba0.5Sr_(0.5)Co_(0.8)Fe_(0.2)O_(3-δ)(BSCF)perovskite layer onto the outer LSCF surface to improve the oxygen permeation were *** 700℃and 1000℃,methane conversion increased in the order of uncoated,BCG and BSCF-coated,and BCG-coated LSCF hollow fiber while Coselectivity and C_(2)-yield increased in the order of BCG and BSCF-coated,uncoated,and BCG-coated LSCF hollow *** permeation flux at the same temperature range,on the other hand,was enhanced in the order of uncoated,BCG-coated,and BCG and BSCF-coated LSCF hollow *** finding demonstrates the complex interplay between oxygen permeation and OCM *** BCG and BSCFcoated hollow fiber was also subjected to thermal cycles between 850℃and 900℃for up to 175 hours during which the fiber showed minor degradation in oxygen permeation fluxes and relatively stable OCM performance.

关键词： Hollow fiber Membrane reactor Oxidative coupling of methane(OCM) Perovskite

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Gamete Recognition in Higher Plants:An Abstruse but Charming Mystery

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Journal of Integrative Plant Biology 2008年第7期50卷 868-874页

作者： Xiong-bo Peng meng-Xiang Sun Key Laboratory of Ministry of Education for Plant Developmental Biology College of Life Sciences Wuhan University Wuhan 430072 China

Although much effort has been made to uncover the mechanism underlying double fertilization, little knowledge has been acquired for understanding the molecular base of gamete recognition, mainly because of technical limitations. Still, progress has been made in terms of the mechanism, including the identification of candidate molecules that are involved in gamete recognition in angiosperms. New cues for gamete recognition have been found by the successful separation of the gametes and construction of gamete-specific cDNA libraries in several species, and the application of molecular approaches for studying this process by mutations. Thus, the topic is considered an abstruse but charming mystery.

关键词： central cell egg cell fertilization gamete recognition sperm cell.

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Three dimensional K-Tz stress fields around the embedded center elliptical crack front in elastic plates

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Acta Mechanica Sinica 2006年第2期22卷 148-155页

作者： Junhua Zhao Wanlin Guo Chongmin She bo meng eng Institute of Nano Science Nanjing University of Aeronautics Astronautics Nanjing 210016 China

Through detailed three-dimensional （3D） finite element （FE） calculations, the out-of-plane constraints Tz along embedded center-elliptical cracks in mode I elastic plates are studied. The distributions of Tz are obtained near the crack front with aspect ratios （a/c） of 0.2, 0.4, 0.5, 0.6, 0.8 and 1.0. Tz decreases from an approximate value of Poisson ratio v at the crack tip to zero with increasing normalized radial distances （r/a） in the normal plane of the crack front line, and increases gradually when the elliptical parameter angle φ changes from 0° to 90°at the same r/a. With a/c rising to 1.0, Tz is getting nearly independent of φ and is only related to r/a. Based on the present FE calculations for Tz, empirical formulas for Tz are obtained to describe the 3D distribution of Tz for embedded center-elliptical cracks using the least squares method in the range of 0.2 ≤ a/c ≤ 1.0. These Tz results together with the corresponding stress intensity factor K are well suitable for the analysis of the 3D embedded centerelliptical crack from field, and a two-parameter K-Tz principle is proposed.

关键词： Three-dimensional finite element Out-of-plane constraint Tz Embedded elliptical crack Stress intensity factor T-Stress Stress field

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Dynamic prediction of moving trajectory in pipe jacking: GRU-based deep learning framework

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Frontiers of Structural and Civil Engineering 2023年第7期17卷 994-1010页

作者： Yi-Feng YANG Shao-Ming LIAO meng-bo LIU Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China Key Laboratory of Road and Traffic Engineering of Ministry of Education Tongji UniversityShanghai 201804China

The moving trajectory of the pipe-jacking machine(PJM),which primarily determines the end quality of jacked tunnels,must be controlled strictly during the entire jacking *** prediction models to support drivers in performing rectifications in advance can effectively avoid considerable trajectory deviations from the designed jacking ***,a gated recurrent unit(GRU)-based deep learning framework is proposed herein to dynamically predict the moving trajectory of the *** this framework,operational data are first extracted from a data acquisition system;subsequently,they are preprocessed and used to establish GRU-based multivariate multistep-ahead direct prediction *** verify the performance of the proposed framework,a case study of a large pipe-jacking project in Shanghai and comparisons with other conventional models(i.e.,long short-term memory(LSTM)network and recurrent neural network(RNN))are *** addition,the effects of the activation function and input time-step length on the prediction performance of the proposed framework are investigated and *** results show that the proposed framework can dynamically and precisely predict the PJM moving trajectory during the pipe-jacking process,with a minimum mean absolute error and root mean squared error(RMSE)of 0.1904 and 0.5011 mm,*** RMSE of the GRU-based models is lower than those of the LSTM-and RNN-based models by 21.46%and 46.40%at the maximum,*** proposed framework is expected to provide an effective decision support for moving trajectory control and serve as a foundation for the application of deep learning in the automatic control of pipe jacking.

关键词： dynamic prediction moving trajectory pipe jacking GRU deep learning

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