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An improved apparent permeability model considering full pore pressure range,variable intrinsic permeability and slippage coefficient

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International Journal of Mining Science and Technology 2022年第6期32卷 1233-1244页

作者： Zhiyong Xiao Changsheng wang gang wang Yujing Jiang Junhong Yu Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation Shandong University of Science and TechnologyQingdao 266590China College of Civil Engineering and Architecture Shandong University of Science and TechnologyQingdao 266590China College of Civil Engineering Fujian University of TechnologyFuzhou 350118China State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and TechnologyQingdao 266590China

Although the slippage effect has been extensively studied,most of the previous studies focused on the impact of the slippage effect on apparent permeability within a low pore pressure range,resulting in the inability of matching the evolution of permeability in the remaining pressure *** this paper,a new apparent permeability model that reveals the evolution of permeability under the combined action of effective stress and slippage in the full pore pressure range was *** this model,both intrinsic permeability and slippage coefficient are stress *** experimental tests with pore pressure lower than 2 MPa and a test with pore pressure at about 10 MPa using cores from the same origin under constant confining stress and constant effective stress are *** comparing experimental data and another apparent permeability model,we proved the fidelity of our newly developed ***,the contribution factor of the slippage effect Rslip is used to determine the low pore pressure limit with significant slippage *** results show that both narrow initial pore size and high effective stress increase the critical pore ***,the evolutions of the slippage coefficient and the intrinsic permeability under different boundary conditions were analyzed.

关键词： Slippage effect Apparent permeability Contribution factor Critical pore pressure Intrinsic permeability

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Generative adversarial network based novelty detection using minimized reconstruction error

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Frontiers of Information Technology & Electronic Engineering 2018年第1期19卷 116-125页

作者： Huan-gang wang Xin LI Tao ZHANG Department of Automation School of Information Science and TechnologyTsinghua University

Generative adversarial network(GAN) is the most exciting machine learning breakthrough in recent years,and it trains the learning model by finding the Nash equilibrium of a two-player zero-sum *** is composed of a generator and a discriminator,both trained with the adversarial learning *** this paper,we introduce and investigate the use of GAN for novelty *** training,GAN learns from ordinary ***,using previously unknown data,the generator and the discriminator with the designed decision boundaries can both be used to separate novel patterns from ordinary *** proposed GAN-based novelty detection method demonstrates a competitive performance on the MNIST digit database and the Tennessee Eastman(TE) benchmark process compared with the PCA-based novelty detection methods using Hotelling's T^2 and squared prediction error statistics.

关键词： Generative adversarial network(GAN) Novelty detection Tennessee Eastman(TE) process

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Recent developments in high-pressure die-cast magnesium alloys for automotive and future applications

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Journal of Magnesium and Alloys 2023年第1期11卷 78-87页

作者： Gerry gang wang J.P.Weiler Meridian Lightweight Technologies StrathroyOntario N7G 4H6Canada

The use of magnesium alloy high pressure die cast(HPDC)components for structural applications,especially in the automotive and transportation industries,where weight reduction is of a great concern,is *** new applications are developing and existing applications are becoming more complex,there is a need for improved properties from magnesium HPDC *** paper reviews the recent developments in HPDC magnesium alloys for transportation *** to the conventional HPDC magnesium alloys,***91D,AM50A/AM60B and AE44,these new alloys have one or more of the following properties:higher strength,higher ductility,superior high-temperature properties or higher thermal *** this work,characteristics which are important in product manufacturing or product performance will be evaluated and discussed,including die castability of powertrain component or thin-walled structural component,mechanical properties at elevated temperatures and *** indicate that these alloys have great potentials to be added to the current magnesium HPDC alloy family and being used in actual automotive and other transport applications.

关键词： alloys alloy ductility

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Gastric motor effects of ghrelin and growth hormone releasing peptide 6 in diabetic mice with gastroparesis

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World Journal of Gastroenterology 2008年第9期14卷 1419-1424页

作者： Wen-Cai Qiu Zhi-gang wang Wei-gang wang Jun Yan Qi Zheng The Affiliated Sixth Hospital of Medical School Shanghai Jiaotong University Shanghai 200233 China

AIM:To investigate the potential therapeutic significance of ghrelin and growth hormone releasing peptide 6 (GHRP-6) in diabetic mice with gastric motility disorders. METHODS: A diabetic mouse model was established by intraperitoneal (ip) injection of alloxan. Diabetic mice were injected ip with ghrelin or GHRP-6 (20-200 μg/kg), and the effects on gastric emptying were measured after intragastric application of phenol red. The effect of atropine, NG-nitro-L-arginine methyl ester hydrochloride (L-NAME) or D-Lys3-GHRP-6 (a growth hormone secretagogue receptor (GHS-R) antagonist) on the gastroprokinetic effect of ghrelin or GHRP-6 (100 μg/kg) was also investigated. The effects of ghrelin or GHRP-6 (0.01-10 μmol/L) on spontaneous or carbachol-induced contractile amplitude were also investigated in vitro, in gastric fundic circular strips taken from diabetic mice. The presence of growth hormone secretagogue receptor 1a transcripts in the fundic strips of diabetic mice was detected by reverse transcriptase polymerase chain reaction (RT-PCR). RESULTS: We established a diabetic mouse model with delayed gastric emptying. Ghrelin and GHRP-6 accelerated gastric emptying in diabetic mice with gastroparesis. In the presence of atropine or L-NAME, which delayed gastric emptying, ghrelin and GHRP-6 (100 μg/kg) failed to accelerate gastric emptying. D-Lys3-GHRP-6 also delayed gastric emptying induced by the GHS-R agonist. Ghrelin and GHRP-6 increased the carbachol-induced contractile amplitude in gastric fundicstrips taken from diabetic mice. RT-PCR confirmed the presence of GHS-R mRNA in the strip preparations. CONCLUSION: Ghrelin and GHRP-6 increase gastric emptying in diabetic mice with gastroparesis, perhaps by activating peripheral cholinergic pathways in the enteric nervous system.

关键词： Gastric emptying Ghrelin Growth hormone releasing peptide 6 Growth hormone secretagogue receptor Diabetic mice

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Data-Driven Control of Distributed Event-Triggered Network Systems

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IEEE/CAA Journal of Automatica Sinica 2023年第2期10卷 351-364页

作者： Xin wang Jian Sun gang wang Frank Allgower Jie Chen the National Key Laboratory of Autonomous Intelligent Unmanned Systems School of AutomationBeijing Institute of TechnologyBeijing 100081 the Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China IEEE the Institute for Systems Theory and Automatic Control University of StuttgartStuttgart 70550Germany the Department of Control Science and Engineering Tongji UniversityShanghai 201804 the National Key Laboratory of Autonomous Intelligent Unmanned Systems Beijing Institute of TechnologyBeijing 100081China

The present paper deals with data-driven event-triggered control of a class of unknown discrete-time interconnected systems(*** systems).To this end,we start by putting forth a novel distributed event-triggering transmission strategy based on periodic sampling,under which a model-based stability criterion for the closed-loop network system is derived,by leveraging a discrete-time looped-functional *** the model-based criterion with a data-driven system representation recently developed in the literature,a purely data-driven stability criterion expressed in the form of linear matrix inequalities(LMIs)is ***,the data-driven stability criterion suggests a means for co-designing the event-triggering coefficient matrix and the feedback control gain matrix using only some offline collected state-input ***,numerical results corroborate the efficacy of the proposed distributed data-driven event-triggered network system(ETS)in cutting off data transmissions and the co-design procedure.

关键词： Data-driven control distributed event-triggered network system(ETS) linear matrix inequalitie(LMI) looped-functional stability

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Behavior of molten steel flow in continuous casting mold with different static magnetic field configurations

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Journal of Iron and Steel Research International 2018年第4期25卷 366-377页

作者： Zhuang Li En-gang wang Yu Xu Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education) Northeastern University Shenyang 110004 Liaoning China School of Materials Science and Engineering Northeastern University Shenyang 110004 Liaoning China School of Metallurgy Northeastern University Sheuyang 110004 Liaoning China

A three-dimensional mathematical model was established to investigate the behavior of molten steel flow and steel/slag interface with different processes and electromagnetic parameters under two different static magnetic field configurations [ruler-type electromagnetic brake （EMBr ruler） and vertical electromagnetic brake （V-EMBr）] in a continuous casting mold. The results showed that the brake effect of EMBr ruler is significantly influenced by its configuration parameters, the distance between the pole and bottom of the submerged entry nozzle （SEN）, and the port angle of the SEN outlet; therefore, it is not helpful to depress the diffusion of jet flow along the thickness direction of mold. For a constant SEN depth and port angle, there is a reasonable pole position （P = 0 mm） where the pole simultaneously covers three key zones, i.e., the jet flow impact zone and the upward and downward backflow zones. For V-EMBr, the magnetic field can simultaneously cover the three key zones and depress the diffusion of jet flow along the casting and thickness directions of the mold. Both the meniscus height and the impact intensity of the jet flow can be obviously depressed by V-EMBr even if the SEN depth and port angle have changed in the continuous casting process.

关键词： Static magnetic field Continuous casting Mold Electromagnetic brake ruler Vertical electromagneticbrake Molten steel flow

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Experimental study on preparation of nanoparticle-surfactant nanofluids and their effects on coal surface wettability

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International Journal of Mining Science and Technology 2022年第2期32卷 387-397页

作者： gang wang Yanqing Li Enmao wang Qiming Huang Shibin wang Huaixing Li Mine Disaster Prevention and Control-Ministry of State Key Laboratory Breeding Base Shandong University of Science and TechnologyQingdao 266590China College of Safety and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China College of Energy and Mining Engineering Shandong University of Science and TechnologyQingdao 266590China

To improve the efficiency of coal seam water injection,the influence of nanofluids on coal surface wettability was studied based on the nano drag reduction and injection enhancement technology in the field of tertiary oil *** composition optimization and performance evaluation of nanofluids with nano-silica and sodium lauryl sulfate as the main components were carried out,and the effects of the nanofluid with the optimal ratio on coal wettability were studied through spontaneous upward imbibition *** results show that the composite nanofluid has a lower surface tension,and the lowest value of the interfacial tension is 15.79 m N/***,the composite nanofluid can enhance the wettability of ***,its effects on coal samples with different metamorphic degrees is different,that is,low rank coal is the largest,middle rank coal is the second,and high rank coal is the *** addition,a functional relationship between time and imbibition height is found for pulverized coal with different particle *** the particle size of pulverized coal is 60–80 mesh,the wettability of nanofluid to coal is *** findings in this paper provide a new perspective for improving the water injection efficiency for coal seams with low permeability.

关键词： Silica nanoparticles Composite nanofluids Hydrophobic modification Surface tension Spontaneous upward imbibition

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Grain-size effect on dislocation source-limited hardening and ductilization in bulk pure Ni

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Journal of Materials Science & Technology 2023年第23期154卷 9-21页

作者： Kai Hu Jun Yi Bo Huang gang wang Institute of Materials School of Materials Science and Engineering Shanghai University Shanghai 200444 China

Dislocation source-limited hardening and ductilization is an effective strategy to obtain superior strength-ductility synergy in some engineering structural metals. Recent works demonstrated that the synergy could be enhanced by grain-size reduction. However, the mechanism of grain-size dependence is still a mystery. In this work, bulk pure Ni produced by electrodeposition and subsequent annealing, with grain sizes ranging from ∼20 nm to ∼20 µm, were methodically investigated to unravel the mechanism of the grain-size effect on dislocation source-limited hardening and ductilization. The high-density nano-twinning in the as-electrodeposited nanograined specimens exhibited better thermodynamic stability than the peers with random high-angle grain boundaries, leading to fine recrystallized grains with low-density dislocations. The low dislocation density enabled extra hardening beyond grain boundary strengthening via yield-point behavior with grain sizes ranging from ∼110 nm to ∼10 µm and extra ductilization over ∼500 nm. This work demonstrated that the prerequisite for dislocation source-limited hardening was that the dislocation density of the specimen should be lower than the size-dependent critical value of ((1.1 × 107 /d ) m^(–2), d is the grain size in unit of the meter) where a transition from forest-dominated hardening to dislocation source-limited hardening could occur. On the other hand, dislocation source-limited ductilization only worked when the grain size was comparable to/larger than the theoretical dislocation mean slip distance. Dislocation source-limited ductilization resulted from more room in grains for accumulation of dislocations and deformation nano-stacking faults enabling the higher work hardening rate. This work offered an altogether new avenue to obtain stronger and more ductile metallic materials through utilizing grain-size dependent dislocation source-limited hardening and ductilization.

关键词： Dislocation source-limited hardening Dislocation source-limited ductilization Grain size Yield point Hall-Petch slope

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Progress on the glassy-crystal laminates:From design,microstructure to deformation and future solutions

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Journal of Materials Science & Technology 2024年第5期172卷 113-144页

作者： Yu Chen Ronggao Cui Jun Shen gang wang College of Mechatronics and Control Engineering Shenzhen UniversityShenzhen 518060China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China Department of Motor Design Business Weichai New Energy Technology Co.Ltd.Weifang 261061China Guangdong Key Laboratory of Electromagnetic Control and Intelligent Robots Shenzhen UniversityShenzhen 518060China Laboratory for Microstructures Institute of MaterialsShanghai UniversityShanghai 200444China

The development of new design strategies to create innovative structural materials,refine existing ones,and achieves compatible combinations of strength and plasticity remains a worldwide *** alloys,such as shape memory alloys(SMAs),bulk metallic glasses(BMGs),high entropy alloys(HEAs),and heterogeneous pure metals such as Cu,have excellent mechanical responses,but they still fall short of meeting all the requirements of structural materials due to specific flaws,such as lack of tensile de-formation for BMGs and low yielding strength for *** address these shortcomings,proposals such as integrating glassy matrices and crystallized alloys,such as HEAs/SMAs,have been ***,these solutions have unresolved issues,such as the challenging control of B2 phase formation in BMG ***,glass-crystal(A/C)laminated alloys with alternating layers have been reported to exhibit improved mechanical properties and activated work-hardening behaviors,but they still face press-ing issues such as bonding interfaces and unknown deformation *** review focuses on design routes such as the selection of alloy components and processing techniques,exploration of micro-structural evolution and deformation modes with an increase in strain,and future solutions to address pressing and unsolved *** prominent advantages include diversified deformation mechanisms,such as deformation twinning,martensitic phase transformation,and precipitation hardening,as well as tuned interactive reactions of shear bands(SBs)near the A/C ***,this review provides a promising pathway to design and develop structural materials in the materials field community.

关键词： Glassy-crystal laminates Bulk metallic glasses High entropy alloys Shape memory alloys Microstructure Deformation mechanisms Future solutions

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In situ growth CNT@MOFs core-shell structures enabling high specific supercapacitances in neutral aqueous electrolyte

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Nano Research 2022年第7期15卷 6112-6120页

作者： Mingxia Lu gang wang Xiping Yang Bo Hou School of Chemistry and Chemical Engineering Henan University of TechnologyZhengzhou 450001China School of Physics and Astronomy Cardiff UniversityCardiff CF243AAUK

Conductive metal-organic frameworks(c-MOFs)are promising active electrode materials for electrochemical double-layer capacitors with a performance that already exceeds most carbon-based ***,their excellent supercapacitance is primarily based on organic or alkaline electrolytes,which largely impede their broad applications and *** this work,we propose a new synthesis approach for fabricating carbon nanotubes and c-MOFs(CNT@MOFs)core–shell structures,which result in high supercapacitance in neutral aqueous *** identify that CNTs provide abundant active sites to ensure high capacitance,and Ni3(2,3,6,7,10,11-hexaiminotriphenylene(HITP))2 nanoarrays that in situ grow on the surface of CNTs bundles can significantly improve the conductivity and provide enough ion transport pathways in aqueous ***,using CNT@MOFs core-shell structures as an electrode,we obtained a high initial capacitance of 150.7 F·g^(−1) at 0.1 A·g^(−1) in 1 M Na2SO4 solution and good capacity retention of 83.5%after 10,000 cycles at 4 A·g^(−1).We also found that the carboxyl groups on the surface of CNTs provide better anchor sites for the in situ growth of c-MOF,which promotes the uniform growth of c-MOF shells on the CNT surface and improves aqueous electrolyte *** believe that the high supercapacitance in aqueous electrolytes reported in this work would provide a good prospect for deploying c-MOF based energy storage devices into biomedical and other healthcare electronic applications.

关键词： carbon nanotubes metal-organic frameworks(MOFs) conductive MOFs supercapacitor neutral aqueous electrolyte

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