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Two-stage robust optimization of power cost minimization problem in gunbarrel natural gas networks by approximate dynamic programming

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Petroleum Science 2022年第5期19卷 2497-2517页

作者： Yi-ze meng Ruo-Ran Chen Tian-Hu Deng Department of Industrial Engineering Tsinghua UniversityBeijing100084China

In short-term operation of natural gas network,the impact of demand uncertainty is not *** address this issue we propose a two-stage robust model for power cost minimization problem in gunbarrel natural gas *** demands between pipelines and compressor stations are uncertain with a budget parameter,since it is unlikely that all the uncertain demands reach the maximal deviation *** solving the two-stage robust model we encounter a bilevel problem which is challenging to *** formulate it as a multi-dimensional dynamic programming problem and propose approximate dynamic programming methods to accelerate the *** results based on real network in China show that we obtain a speed gain of 7 times faster in average without compromising optimality compared with original dynamic programming *** results also verify the advantage of robust model compared with deterministic model when facing *** findings offer short-term operation methods for gunbarrel natural gas network management to handle with uncertainties.

关键词： Natural gas Gunbarrel gas pipeline networks Robust optimization Approximate dynamic programming

The atmospheric hinder for intraseasonal sea-air interaction over the Bay of Bengal during Indian summer monsoon in CMIP6

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Acta Oceanologica Sinica 2022年第10期41卷 119-130页

作者： ze meng Lei Zhou Baosheng Li Jianhuang Qin Juncheng Xie School of Oceanography Shanghai Jiao Tong UniversityShanghai200030China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai519080China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou310012China College of Oceanography Hohai UniversityNanjing266071China Marine Science and Technology College Zhejiang Ocean UniversityZhoushan316000China

The surroundings of the Bay of Bengal(Bo B)suffer a lot from the extreme rainfall events during Indian summer monsoon(ISM).Previous studies have proved that the sea-air interaction is an important factor for the monsoonal *** the 6th Coupled Modol Inter-comparison Project(CMIP6)models,this study examined the biases of surface heat flux,which is the main connection between atmosphere and *** show that although CMIP6 have a better simulation of intraseasonal sea surface temperature(SST)anomalies over Bo B than the previous ones,the“atmospheric blockage”still delays the response of latent heat flux to the oceanic ***,during the increment of positive latent heat flux in CMIP6,the negative contribution from wind effects covers most of the positive contribution from humidity effects,due to the underestimate of humidity *** diagnostic analysis denote that the surface air humidity has a quarter of a phase ahead of warm SST in observation,but gets wet along with the warm SST accordingly in most CMIP6 *** a result,the simulated transfer of intraseasonal moisture flux is hindered between ocean and ***,as a bridge between both sides,the atmospheric boundary layer is essential for a better sea-air coupled simulation,especially when the atmospheric and the oceanic variabilities involved in a climate model becomes increasingly *** surface air humidity and boundary layer processes require more attention as well as better simulations.

关键词： Bay of Bengal ocean-atmosphere interaction CMIP6 latent heat flux intraseasonal variability

ROS-Responsive Berberine Polymeric Micelles Effectively Suppressed the Inflammation of Rheumatoid Arthritis by Targeting Mitochondria

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Nano-Micro Letters 2020年第6期12卷 138-151页

作者： Xing-xing Fan meng-ze Xu Elaine Lai-Han Leung Cai Jun Zhen Yuan Liang Liu State Key Laboratory of Quality Research in Chinese Medicine Macao Institute For Applied Research in Medicine and HealthMacao University of Science and TechnologyAvenida Wai LongTaipaMacao SARChina Faculty of Health Sciences University of MacaoTaipaMacao SARChina

Rheumatoid arthritis(RA)is an autoimmune disease,which attacks human joint system and causes lifelong inflammatory *** date,no cure is available for RA and even the ratio of achieving remission is very ***,to enhance the efficacy of RA treatment,it is essential to develop novel approaches specifically targeting pathological *** this study,we discovered that RA synovial fibroblasts exhibited higher reactive oxygen species(ROS)and mitochondrial superoxide level,which were adopted to develop ROS-responsive nano-medicines in inflammatory microenvironment for enhanced RA treatment.A selenocystamine-based polymer was synthesized as a ROS-responsive carrier nanoplatform,and berberine serves as a tool *** assembling,ROS-responsive berberine polymeric micelles were fabricated,which remarkably increased the uptake of berberine in RA fibroblast and improved in vitro and in vivo efficacy ten times ***,the anti-RA effect of micelles was blocked by the co-treatment of AMPK inhibitor or palmitic acid,indicating that the mechanism of micelles was carried out through targeting mitochondrial,suppressing lipogenesis and finally inhibiting cellular *** together,our ROS-responsive nano-medicines represent an effective way of preferentially releasing prodrug at the inflammatory microenvironment and improving RA therapeutic efficacy.

关键词： Rheumatoid arthritis Reactive oxygen species Nanoparticles Berberine Oxygen consumption rate

Comparative study on interaction between rare earth oxide refractories and rare earth treated steel

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Journal of Iron and Steel Research International 2024年第6期31卷 1493-1501页

作者： ze meng Guang-qiang Li Cheng Yuan Yi-jiang Zhao Qing Zheng Bin zeng Yu Liu The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081HubeiChina Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan430081HubeiChina Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking Wuhan University of Science and TechnologyWuhan430081HubeiChina Technical Center Lianyuan Iron and Steel Co.Ltd.Loudi417009HunanChina

Refractories have an important effect on the cleanliness of molten *** interaction between CeAlO_(3) refractories and Ce treated steel was explored and compared with that between Al_(2)O_(3) refractories and Ce treated *** results show that the Ce content in steel decreases sharply after contact with Al_(2)O_(3) refractories and the pick-up of dissolved Al *** with the test of Al_(2)O_(3) refractories,the loss of Ce content is less in the test of CeAlO_(3) refractory,and the total oxygen content and dissolved Al content in steel increase *** dense and continuous Ce_(2)O_(2)S interface layer is observed at the CeAlO_(3) refractories/steel interface,which can serve as the metallurgical isolation layer and hinder the further interaction between refractories and ***,the higher steel cleanliness and less penetration of refractories by molten steel are obtained in the test of CeAlO_(3) *** CeAlO_(3) refractories show a promising prospect in the production of clean Ce treated steel.

关键词： CeAlO_(3)refractory Steel Cleanliness Interaction Rare earth

Corrosion behavior of Al_(2)O_(3)-C bricks in MnO-containing mold slag

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Journal of Iron and Steel Research International 2024年第6期31卷 1486-1492页

作者： Yi-jiang Zhao Guang-qiang Li Yang Wu Cheng Yuan ze meng Xiao-xuan Deng Yu Liu The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan 430081HubeiChina Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking Wuhan University of Science and TechnologyWuhan 430081HubeiChina Research Institute of Technology Shougang Group Co.Ltd.Beijing 100043China

In order to explore the corrosion mechanism of Al_(2)O_(3)-C refractories in the mold flux bearing MnO,the immersion test of Al_(2)O_(3)-C refractories in CaO-SiO2-CaF2-MnO slag with different MnO contents was carried out at 1550℃.The results show that Mn particles were observed in the slag after experiment,due to the reduction of MnO by graphite in *** amounts of graphite were observed at the interface between refractories and slag,indicating that the oxidation of graphite is limited by the poor contact between graphite and molten ***,the oxidation of graphite is not the main cause of damage to refractories.A small quantity of CaO·2Al_(2)O_(3)(CA_(2))and CaO·6Al_(2)O_(3)(CA_(6))adjacent to Al_(2)O_(3) grain was detected at the slag/reaction layer ***_(2) and CA_(6) possess relatively high melting points,which is beneficial to hindering the further penetration of ***,the dissolution of Al_(2)O_(3) into slag is still the main cause for refractories *** increase in the MnO content of mold slag decreases the viscosity and then results in the severe corrosion of Al_(2)O_(3)-C bricks.

关键词： Al_(2)O_(3)-C refractory MnO-containing slag Graphite Corrosion

One-dimensional Zigzag Chain Composed of HgI_2 Unit and 2,5-Bis(4-pyridyl)-1,3,4-thiadiazole:[HgI_2(C_(12)H_8N_4S)]

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Chinese Journal of Structural Chemistry 2006年第10期25卷 1189-1192页

作者： CHEN Li-Juan meng ze-Rong ZHANG Quan-Zheng WU Xiao-Yuan LU Can-Zhong State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter The Chinese Academy of Sciences Fuzhou Fujian 350002 China

The title compound, [HgI2（C12H8N4S）], has been synthesized and characterized by single-crystal X-ray diffraction analysis. It crystallizes in monoclinic, space group P21/n with a = 14.086（2）, b = 6.0365（6）, c = 20.286（2）°A,β= 108.818（5）°, V = 1632.7（3）°A^3, Mr = 694.67, Z = 4, D, = 2.826 g/cm^3,μ= 13.331 mm^-1, F（000） = 1240, S = 1.108, the final R = 0.0438 and wR = 0.0934 for 3085 observed reflections （I〉 2σ（I））. The Hg（Ⅱ） atom is coordinated by two 2,5-bis（4-pyridyl）-1,3,4-thiadiazole （L） molecules and two iodine anions in a distorted tetrahedral coordination geometry. Mercury atoms are linked by the organic ligands to form a one-dimensional zigzag chain. It is noteworthy that such 1D zigzag chains are extended into a two-dimensional double layer framework through I…I interactions

关键词： 2,5-bis(4-pyridyl)-1,3,4-thiadiazole mercury(Ⅱ) complex 2D double layer

Removal of siloxanes from biogas using acetylated silica gel as adsorbent

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Petroleum Science 2019年第4期16卷 920-928页

作者： Yu-Heng Liu ze-You meng Ji-Ye Wang Yan-Fei Dong Zi-Chuan Ma College of Chemistry and Material Science Hebei Normal College of Pharmaceutical Sciences Hebei Medical UniversityShijiazhuang 050017HebeiChina

Biogas can be used as an alternative energy source for producing heat and electricity;however, volatile methylsiloxanes(VOSiC) present in biogas can severely damage heat exchangers, turbines and gas engines. Consequently, e cient removal of VOSiC from biogas that is used as a biofuel is required. In this work, acetylated silica gel(Ac@SG) was synthesized,via treatment of microporous silica gel(SG) with acetic anhydride as an adsorbent, for removal of VOSiC from biogas,and characterized with XRD, SEM–EDS, N2-BET and FT-IR. This Ac@SG adsorbent exhibited a meso-/microporous structure and hydrophobic surface, indicating it was a more e cient adsorbent for removing hexamethyldisiloxane(L2) and octamethylcyclotetrasiloxane(D4) from biogas samples than conventional SG. It was found that the adsorption capacities of Ac@SG reached 304 mg L2/g for hexamethyldisiloxane and 916 mg D4/g for octamethylcyclotetrasiloxane at lower temperatures in the experimental range, and water had no significant e ect on its absorption e ciency. The used Ac@SG could be easily regenerated by heating it at 110 °C, and the adsorption capacity of recycled Ac@SG for hexamethyldisiloxane and octamethylcyclotetrasiloxane was kept constant in four recycle adsorption experiments.

关键词： Siloxanes Biogas Acetylated silica gel Adsorption Removal of the siloxanes

Reduced turnover rate of topsoil organic carbon in old-growth forests:a case study in subtropical China

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Forest Ecosystems 2021年第4期8卷 778-788页

作者： Xin Xiong Juxiu Liu Guoyi Zhou Qi Deng Huiling Zhang Guowei Chu ze meng Deqiang Zhang Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystem South China Botanical GardenChinese Academy of SciencesGuangzhou 510650China Center for Plant Ecology Core Botanical GardensChinese Academy of SciencesGuangzhou 510650China School of Applied Meteorology Nanjing University of Information Science&TechnologyNanjing 210044China

Background:Old-growth forests are irreplaceable with respect to climate change mitigation and have considerable carbon(C)sink potential in ***,the relationship between the soil organic carbon(SOC)turnover rate and forest development is poorly understood,which hinders our ability to assess the C sequestration capacity of soil in old-growth ***:In this study,we evaluated the SOC turnover rate by calculating the isotopic enrichment factor β(defined as the slope of the regression between ^(13)C natural abundance and log-transformed C concentrations)along 0-30 cm soil profiles in three successional forests in subtropical China.A lower β(steeper slope)is associated with a higher turnover *** three forests were a 60-year-old *** forest(PF),a 100-year-old coniferous and broadleaved mixed forest(MF),and a 400-year-old monsoon evergreen broadleaved forest(BF).We also analyzed the soil physicochemical properties in these forests to examine the dynamics of SOC turnover during forest succession and the main ***:The β value for the upper 30-cm soils in the BF was significantly(pzes the important value of old-growth forests among global C sinks.

关键词： Forest succession Old-growth forests Soil organic carbon Turnover rate 13C natural abundance

Equation governing the probability density evolution of multi-dimensional linear fractional differential systems subject to Gaussian white noise

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Theoretical & Applied Mechanics Letters 2023年第3期13卷 199-208页

作者： Yi Luo meng-ze Lyu Jian-Bing Chen Pol D.Spanos George R.Brown School of Engineering Rice UniversityHouston 77005TXUSA Institute for Risk&Reliability Leibniz University HannoverHannover 30167Germany College of Civil Engineering Tongji UniversityShanghai 200092China State Key Laboratory of Disaster Reduction in Civil Engineering Tongji UniversityShanghai 200092China

Stochastic fractional differential systems are important and useful in the mathematics,physics,and engineering ***,the determination of their probabilistic responses is difficult due to their non-Markovian *** recently developed globally-evolving-based generalized density evolution equation(GE-GDEE),which is a unified partial differential equation(PDE)governing the transient probability density function(PDF)of a generic path-continuous process,including non-Markovian ones,provides a feasible tool to solve this *** the paper,the GE-GDEE for multi-dimensional linear fractional differential systems subject to Gaussian white noise is *** particular,it is proved that in the GE-GDEE corresponding to the state-quantities of interest,the intrinsic drift coefficient is a time-varying linear function,and can be analytically *** this sense,an alternative low-dimensional equivalent linear integer-order differential system with exact closed-form coefficients for the original highdimensional linear fractional differential system can be constructed such that their transient PDFs are ***,for a multi-dimensional linear fractional differential system,if only one or two quantities are of interest,GE-GDEE is only in one or two dimensions,and the surrogate system would be a one-or two-dimensional linear integer-order *** examples are studied to assess the merit of the proposed *** presently the closed-form intrinsic drift coefficient is only available for linear stochastic fractional differential systems,the findings in the present paper provide a remarkable demonstration on the existence and eligibility of GE-GDEE for the case that the original high-dimensional system itself is non-Markovian,and provide insights for the physical-mechanism-informed determination of intrinsic drift and diffusion coefficients of GE-GDEE of more generic complex nonlinear systems.

关键词： Globally-evolving-based generalized density evolution equation(GE-GDEE) Linear fractional differential system Non-Markovian system Analytical intrinsic drift coefficient Dimension reduction