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Near-source characteristics of two-phase gas-solid outbursts in roadways

International Journal of Coal Science & Technology 2021年第4期8卷 685-696页

作者： Aitao Zhou meng zhang Kai Wang Derek Elsworth Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources China University of Mining and Technology(Beijing)Beijing 100083China School of Emergency Management and Safety Engineering China University of Mining and Technology(Beijing)Beijing 100083China Department of Energy and Mineral Engineering EMS Energy Institute and G3 CenterPennsylvania State UniversityUniversity ParkPAUSA

Coal and gas outbursts compromise two-phase gas-solid mixtures as they propagate as shock waves and flows from their *** is influenced by the form of the outburst,proximity to source,the structure and form of the transmitting roadways and the influence of *** following characterizes the propagation of coal and gas outbursts as two-phase gas-solid flows proximal to source where the coupled effects of pulverized coal and gas flows dominate *** characteristics of shock wave propagation and attenuation were systematically examined for varied roadway geometries using experiments and numerical *** results demonstrate that the geometry of roadway obstructions is significant and may result in partial compression and sometimes secondary overpressurization in blocked and small comer roadways leading to significant attenuation of outburst shock *** shock waves attenuate slowly in both straight and abruptly expanding roadways and more significantly in T-shaped *** most significant attenuation appears in small angle comers and bifurcations in roadways with the largest attenuation occurring in blocked *** results provide basic parameters for simplifying transport in complex roadway networks in the far-field,and guidance for the design of coal and gas outburst prevention facilities and emergency rescue.

关键词： Coal and gas outburst Proximity to source Shock wave propagation Two-phase gas-solid flow Outburst prevention

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Optical remote sensing image characteristics of large amplitude convex mode-2 internal solitary waves:an experimental study

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Acta Oceanologica Sinica 2023年第6期42卷 16-23页

作者： Zhixin Li meng zhang Keda Liang Jing Wang College of Physics and Optoelectronic Engineering Ocean University of ChinaQingdao 266100China

A series of experiments are designed to propose a new method to study the characteristics of convex mode-2internal solitary waves(ISWs)in optical remote sensing images using a laboratory-based optical remote sensing simulation *** corresponding wave parameters of large-amplitude convex mode-2 ISWs under smooth surfaces are investigated along with the optical remote sensing characteristic *** mode-2 ISWs in the experimentally obtained optical remote sensing image are produced by their overall modulation effect on the water surface,and the extreme points of the gray value of the profile curve of bright-dark stripes appear at the same location as the real optical remote sensing *** present data extend to a larger range than previous studies,and for the characteristics of large amplitude convex mode-2 ISWs,the experimental results show a second-order dependence of wavelength on *** is a close relationship between optical remote sensing characteristic parameters and wave parameters of mode-2 ISWs,in which there is a positive linear relationship between the bright-dark spacing and wavelength and a nonlinear relationship with the amplitude,especially when the amplitude is very large,there is a significant increase in bright-dark spacing.

关键词： mode-2 internal solitary waves optical remote sensing characteristic parameter wave characteristic

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Enzyme Activities in Perfluorooctanoic Acid (PFOA)-Polluted Soils

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Pedosphere 2013年第1期23卷 120-127页

作者： zhang Wei LIN Kuang-Fei YANG Sha-Sha zhang meng School of Resource and Environmental Engineering East China University of Science and Technology State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process Shanghai Key Laboratory of Functional Materials Chemistry East China University of Science and Technology

Perfluorooctanoic acid （PFOA） is a popular additive of the chemical industry; its effect on activities of important soil enzymes is not well understood. A laboratory incubation experiment was carried out to analyze the PFOA-induced changes in soil urease, catalase, and phosphatase activities. During the entire incubation period, the activities of the three soil enzymes generally declined with increasing PFOA concentration, following certain dose-response relationships. The values of EC10, the contaminant concentration at which the biological activity is inhibited by 10%, of PFOA for the soil enzyme activity calculated from the modeling equation of the respective dose-response curve suggested a sensitivity order of phosphatase 〉 catalase 〉 urease. The effect of PFOA on soil enzyme activities provided a basic understanding of the eco-toxicological effect of PFOA in the environment. Results of this study supported using soil ohosohatase as a convenient biomaxker for ecological risk assessment of PFOA-oolluted soils.

关键词： activity inhibition biomarker dose-response curve ecological risk regression equation

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Synthesis and Neuroprotective Activity of Neolamellarin A Analogues

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Journal of Ocean University of China 2018年第4期17卷 967-972页

作者： zhang meng YIN Ruijuan zhang Yiran HAO Cui zhang Lijuan JIANG Tao Systems Biology and Medicine Center for Complex Diseases Affiliated Hospital of Qingdao UniversityQingdao 266003China School of Medicine and Pharmacy Ocean Universityof ChinaQingdao 266003China Marine Biomedical Research Institute of Qingdao Qingdao 266003China

Alkaloids are a class of natural products with a wide range of biological activities. Due to the special living environment, the alkaloids from marine sponges have exhibited different biological activities and promising medical application potential. Neolamellarin A is a marine alkaloid possessing bisaryl-pyrrole structural features. Here, the synthesis of 12 different 3,4-bisaryl-N-alkylated permethylated analogues of neolamellarin A and their outstanding neuroprotective activity in PC12 cells are presented and discussed.

关键词： alkaloids neolamellarin A synthesis PC12 cells neuroprotective activity

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An electroencephalography-based human-machine interface combined with contralateral C7 transfer in the treatment of brachial plexus injury

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Neural Regeneration Research 2022年第12期17卷 2600-2605页

作者： meng zhang Ci Li Song-Yang Liu Feng-Shi zhang Pei-Xun zhang Department of Orthopedics and Trauma Peking University People’s HospitalBeijingChina Key Laboratory of Trauma and Neural Regeneration Peking UniversityBeijingChina National Center for Trauma Medicine BeijingChina

Transferring the contralateral C7 nerve root to the median or radial nerve has become an important means of repairing brachial plexus nerve ***,outcomes have been ***(EEG)-based human-machine interfaces have achieved promising results in promoting neurological recovery by controlling a distal exoskeleton to perform functional limb exercises early after nerve injury,which maintains target muscle activity and promotes the neurological rehabilitation *** review summarizes the progress of research in EEG-based human-machine interface combined with contralateral C7 transfer repair of brachial plexus nerve *** transfer may result in loss of nerve function in the donor area,so only nerves with minimal impact on the donor area,such as the C7 nerve,should be selected as the *** tendon transfer does not fully restore optimal joint function,so multiple functions often need to be reestablished *** with traditional manual rehabilitation,EEG-based human-machine interfaces have the potential to maximize patient initiative and promote nerve regeneration and cortical remodeling,which facilitates neurological *** the early stages of brachial plexus injury treatment,the use of an EEG-based human-machine interface combined with contralateral C7 transfer can facilitate postoperative neurological recovery by making full use of the brain’s computational capabilities and actively controlling functional exercise with the aid of external *** can also prevent disuse atrophy of muscles and target organs and maintain neuromuscular junction *** cortical remodeling is also particularly important for neurological recovery after contralateral C7 *** studies are needed to investigate the mechanism by which early movement delays neuromuscular junction damage and promotes cortical *** this mechanism should help guide the development of neurolog

关键词： arm injuries brachial plexus brain-computer interfaces nerve transfer nerve regeneration nerve tissue neurofeedback neurological rehabilitation user-computer interface

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Application of Participatory Development Theory in Wetland Ecotourism Initiatives——A Case Study of Baiyangdian in Anxin of Hebei Province

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湿地科学 2008年第3期6卷 422-428页

作者： zhang meng SONG Jinping zhang Ning School of Geography and Remote Sensing Beijing Normal University Beijing 100875 P. R. China

As one of the few ecological wetlands in North China,Baiyangdian bears multiple important ecological functions,including ①adjusting the ecological balance of North China;②safeguarding the downstream areas,especially Tianjin City,the Beijing-Shanghai Railway and Huabei Oil Field;③serving as the reservoir for the North-to-South Water Diversion Project and the emergent use of water for Beijing;④conserving *** ecotourism is a scientific and wise use pattern for wetland resources,through which,a source of financing is provided for wetland conservation,economic alternatives are generated for local people to reduce overexploitation on wetland resources and the public awareness of environmental protection is *** wetland ecotourism can benefit the co-existence between human and nature and promote social equity between people,it enjoys broad promise for popularization and *** proactive cooperation and sound interaction between main stakeholders,and the wide participation of the community residents,will guarantee the sustainable development of wetland *** on the analysis of current status of participation and interactive relationships of the main stakeholders in Baiyangdian tourism,this article made an attempt to apply the theory of participatory development to the ecotourism initiatives of Baiyangdian wetland,discussed and brought forward the countermeasures to improve community participation in wetland ecotourism under the guidance of this theory.

关键词：湿地旅游资源旅游业发展战略河北

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Electrochemical conversion of CO2 to syngas with a wide range of CO/H2 ratio over Ni/Fe binary single-atom catalysts

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Nano Research 2020年第12期13卷 3206-3211页

作者： meng zhang Zheng Hu Lin Gu Qinghua zhang Linghui zhang Qian Song Wei Zhou Shi Hu Department of Chemistry School of ScienceTianjin Key Laboratory of Molecular Optoelectronic ScienceTianjin UniversityTianjin300072China Institute of Energy Hefei Comprehensive National Science CenterHefei230000China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing100190China

A series of carbon-based binary single-atom catalysts of Fe and Ni coordinated by nitrogen are fabricated using a glucose-chelating *** on the Ni/Fe content,they exhibit a wide-range of controllable CO/H2 ratio from 0.14 to 10.86,which is meaningful to specific chemical *** durability of the catalyst is evaluated over an 8-hour period with no significant degradation of *** variation of the faradaic efficiency with Ni/Fe content is justified by density-functional-theory based calculation of the reaction barrier in both hydrogen evolution and CO2 reduction reactions.

关键词： CO2 reduction syngas binary single-atom catalyst electrocatalysis

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Characterization of diffusion-bonded joint between Al and Mg using a Ni interlayer

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Rare Metals 2016年第7期35卷 537-542页

作者： Jian zhang Guo-Qiang Luo Qiang Shen Lian-meng zhang Zhi-Jun Huang Research and Development Center of Wuhan Iron and Steel(Group)Corporation Wuhan 430080China State Key Laboratory of Advanced for Materials Synthesis andProcessing Wuhan University of TechnologyWuhan 430070China

Aluminum and magnesium were joined through diffusion bonding using Ni interlayer. The micro- structure and mechanical performance of the A1/Ni/Mg joints at different temperatures was investigated by means of scanning electron microscope （SEM）, electro-probe microanalyzer （EPMA）, X-ray diffraction （XRD）, Vickers hardness testing, and shear testing. The results show that the addition of Ni interlayer eliminates the formation of Mg-A1 intermetallic compounds and improves the bonding strength of the A1/Mg joints. The AI/Ni/Mg joints are formed by the diffusion of A1, Ni and Mg, Ni. The microstructure at the joint interface from A1 side to Mg side is A1 substrate/A1-Ni reaction layer/Ni interlayer/Mg-Ni reaction layer/Mg substrate multilayer structure. The mi- crohardness of the Mg-Ni reaction layer has the largest value of HV 255.0 owing to the existence of Mg2Ni phase. With the increase of bonding temperature, the shear strength of the joints increases firstly and then decreases. The A1/Ni/Mg joint bonds at 713 K for 90 min, exhibiting the maximum shear strength of 20.5 MPa, which is greater than that of bonding joint bonded directly or with Ag interlayer. The fracture of the joints takes place at the Mg- Ni interface rather than the A1-Ni interface, and the frac- ture way of the joints is brittle fracture.

关键词： A1-Mg Ni foil Diffusion bonding Microstructure Shear strength

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In-situ growth of gold nanoparticles on electrospun flexible multilayered PVDF nanofibers for SERS sensing of molecules and bacteria

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Nano Research 2021年第12期14卷 4885-4893页

作者： Dongzhen Chen Liang zhang Pan Ning Haozhi Yuan Yu zhang meng zhang Tao Fu Xinhai He Key laboratory of functional textile sensing fiber and irregular shape weaving technology School of Materials Science&EngineeringXi’an Polytechnic UniversityXi’an710048China Key Laboratory of Biomedical Information Engineering of Ministry of Education School of Life Science and TechnologyXi’an Jiaotong UniversityXi’an710049China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an710049China Non-equilibrium Condensed Matter and Quantum Engineering Laboratory The Key Laboratory of Ministry of EducationSchool of ScienceXi’an Jiaotong UniversityXi’an710049China Department of Neurology The First Affiliated Hospital of Xi’an Jiaotong UniversityXi’an710061China

Plasmonic surface of flexible multilayered nanofibers possesses special superiority for the surface-enhanced Raman scattering(SERS)sensing of molecules and microbial ***,the fabrication of flexible plasmonic nanofibers with high sensitivity and reproducibility is ***,we report a smart strategy for fabricating flexible plasmonic fibers,in which compact and homogeneous gold nanoparticles(Au NPs)are in-situ grown on the high-curvature surface of multilayered fibers of electrospun polyvinylidene fluoride(PVDF).Firstly,the surface of PVDF fibers is changed electrically,and Au seeds are deposited on the surface of PVDF fibers using electrostatic driving ***,a stable AuI_(4)−complex is formed employing coordination between I−and AuCl4−ions,which could decrease the reduction potential of AuCl4−and restrain the self-nucleation,and then the reduction reaction of AuI4−is initiated by introducing PVDF@Au seeds to pull down the barrier of potential ***,in-situ growth of AuNPs is generated on the high-curvature surface of PVDF nanofibers,and large-scale hotspots are generated by adjacent AuNPs coupling in the three-dimensional(3D)space of multilayered *** of PVDF@Au nanofibers also realizes the sensitive detection of thiram molecules(low limit of detection of 0.1 nM)and good reproducibility(relative standard deviation of 10.6%).Meanwhile,due to the multilayered construction of PVDF@Au nanofibers,a valid SERS signal on 3D surface of bacteria could be generated.3D distribution of hotspots on multilayered PVDF@Au nanofibers gives a clear advantage for SERS sensing of organic molecules and microbial cells.

关键词： electrospinning polyvinylidene fluoride(PVDF) in-situ growth of gold three-dimensional(3D)multilayered nanofibers flexible surface-enhanced Raman scattering(SERS)substrate bacteria sensing

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Dynamics of bilateral control system with state feedback for price adjustment strategy

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International Journal of Biomathematics 2021年第5期14卷 145-161页

作者： meng zhang Yi Zhao Xinyu Song Beijing University of Civil Engineering and Architecture Beijing 100044 P.R.China College of Mathematics and Statistics Huanghuai University Zhumadian 463000 P.R.China

The price fluctuation of commodities affects their demand,and it strongly influences the development of industry and the stability of the international economy.A price-output model with two price-dependent impulses is presented in this paper to describe their mutual restrictions and the price adjustment *** equilibria and dynamic properties of the impulsive-free price-output model are qualitatively analyzed,and the results show the hazard of free price *** the price-output model with two price-dependent impulses,conditions for the existence of the order-2 periodic solution are obtained,and the orbital asymptotic stability is *** results reveal the positive role of price adjustment ***,some numerical simulations are carried out to verify the theoretical results.

关键词： price adjustment state feedback impulsive model order-2 periodic solution successor function

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