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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

Fine particle aggregating and flotation behavior induced by high intensity conditioning of a CO_2 saturation slurry

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Mining Science and Technology 2009年第4期19卷 483-488页

作者： SUN Wei deng Mei-jiao hu Yue-hua School of Minerals Processing and Bioengineering Central South University Changsha Hunan 410083 China

The influence on fine particle aggregation and flotation behavior induced by high intensity conditioning(HIC) from saturated of the slurry with CO2 saturation was *** size measurements were *** effect of dissolved gas,xanthate addition and agitation speed on fine sphalerite particle aggregation-and flotation-behavior were *** results show that during HIC in air or CO2 saturated water xanthate acts as a *** dissolved gas content in the pulp and HIC play a synergistic role in promoting fine particle aggregation and hence flotation;a significantly enhanced aggregation of fine sphalerite particles in a CO2 saturated slurry by HIC is *** aggregate size increased when the agitation speed was increased from 700 r/min to 1500 r/*** the HIC speed to 1500 r/min caused a positive impact on flotation *** increasing the speed to 2000 r/min resulted in an adverse effect on flotation kinetics.

关键词： CO2 saturation high intensive conditioning cavitation aggregation flotation

Hedgehog signaling pathway regulated the target genes for adipogenesis in silkworm Bombyx moil

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Insect Science 2015年第5期22卷 587-596页

作者： Shuang Liang Rui-Ting Chen deng-Pan Zhang hu-hu Xin Yan Lu Mei-Xian Wang Yun-Gen Miao Key Laboratory of Animal Virology of Ministry of Agriculture College of Animal Sciences Zhejiang University Hangzhou 310058 China

Hedgehog （Hh） signals regulate invertebrate and vertebrate development, yet the role of the pathway in adipose development remains poorly understood. In this report, we found that Hh pathway components are expressed in the fat body of silkworm larvae. Functional analysis of these components in a BmN cell line model revealed that activa- tion of the Hh gene stimulated transcription of Hh pathway components, but inhibited the expression of the adipose marker gene AP2. Conversely, specific RNA interference- mediated knockdown of Hh resulted in increased AP2 expression. This further showed the regulation of Hh signal on the adipose marker gene. In silkworm larval models, enhanced adipocyte differentiation and an increase in adipocyte cell size were observed in silkworms that had been treated with a specific Hh signaling pathway antagonist, cyclopamine. The fat-body-specific Hh blockade tests were consistent with Hh signaling inhibiting silkworm adipogenesis. Our results indicate that the role of Hh signaling in inhibiting fat formation is conserved in vertebrates and invertebrates.

关键词： adipocyte differentiation adipogenesis Bombyx mori Hedgehog (Hh) signaling pathway silkworm

Preparation and electrochemical characteristics of Co_3(PO_4)_2-coated LiNi_(0.8)Co_(0.2)O_2 by solid-state reaction at room temperature

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Rare Metals 2008年第5期27卷 502-506页

作者： deng Xinrong hu Guorong PENG Zhongdong YANG Yanan CAO Yanbing DU Ke School of Metallurgical Science and Engineering Central South University Changsha 410083 China

LiNi0.8Co0.2O2 particles were modified by Co3（PO4）2 coating. The effects of the Co3（PO4）2 coating on the structure and electrochemical properties of the LiNi0.8Co0.2O2 cathode material were investigated. The Co3（PO4）2 coating forms a thin layer on the surface of the LiNi0.8Co0.2O2 material and a solid solution by interacting with the LiNi0.8Co0.2O2 core material during calcination at 700℃ for 4 h. Charge-discharge experiment results show that the Co3（PO4）2 coating improves the cycling stability of the LiNi0.8Co0.2O2 cathode material. The capacity retention of the pristine LiNi0.8Co0.2O2 cathode after 50 cycles is 83.6%, whereas it is 91.7% in the case of the LiNi0.8Co0.2O2 cathode coated with 1 wt.% Co3（PO4）2. Storage tests of the 4.35 V charged electrode at 60℃ after a month show that the Co3（POg）2-coated sample exhibits good storage properties compared with the pristine sample.

关键词： lithium ion battery coating solid-state reaction Co3(PO4)2 electrochemical characteristics

On Amenable Banach Algebras

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Journal of Mathematical Research with Applications 1991年第4期 487-496页

作者： deng Hongjun hu Yaohua(hubei University)

In this paper we extend the concept of amenable algebra given by Jobnsonin[3]to n-amenable *** prove several properties which are extensionof1-amenable algebras appeared in[3]and[4],and we give a sufficientcondition f... 详细信息

关键词： algebra sided projective proposition approximate commutative trivial associative 算子代数 topological

Dimensionless model to determine spontaneous combustion danger zone in the longwall gob

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西安科技大学学报 2011年第6期31卷 649-654页

作者： ZHANG Xin-hai deng Jun WEN hu College of Energy Science and Engineering Xi＇ an University of Science and Technology Xi＇ an 710054 China

According to spontaneous combustion propensity,the longwall gob is divided into three zones,including heat dissipation zone,self-heating zone and the choking *** in the self-heating zone can temperature of coal rise due to *** the distribution of the "Three Zones" in gob is important for predicting and preventing spontaneous combustion in *** normal mining operations,temperature of coal is roughly *** process of mass transfer in the gob is considered to be *** on mass conservation,gas species conservation,darcy's law,Ficks law of diffusion and coal oxidation 1-grade reaction rule,governing equation for air leakage intensity and species concentration are *** critical value of coal spontaneous combustion and the size of longwall workface as basic dimension,a dimensionless steady coupled model of air flow diffusion and chemical reaction in loose coal of Fully Mechanized Top-Coal Caving Mining Workface(FMTCCMW) is *** solving the model numerically,regulation of three zones' distribution and spontaneous combustion in the gob can be *** results can be easily popularized to prediction of spontaneous combustion in other coalmines' longwall gob.

关键词： fully mechanized top-coal caving workface spontaneous combustion dimensionless model

Comparisons of nozzle orifice processing methods using synchrotron X-ray micro-tomography

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第3期13卷 182-188页

作者： Zhi-jun WU Zhi-long LI Wei-di huANG hui-feng GONG Ya GAO Jun deng Zong-jie hu School of Automotive Studies Tongji University Shanghai 201019 China

Based on the high flux synchrotron X-ray of the Shanghai Synchrotron Radiation Facility (SSRF), high precision 3D digital models of diesel nozzle tips have been established by X-ray micro-tomography technology, which reveal the internal surfaces and structures of orifices. To analyze the machining precision and characteristics of orifice processing methods, an ap- proach is presented based on the parameters of the internal structures of nozzle orifices, including the nozzle diameter, the orifice inner surface waviness, the eccentricity distance and the angle between orifices. Using this approach, two kinds of nozzle orifice processing methods, computerized numerical control drilling and electric discharge machining, have been studied and compared. The results show that this approach enables a simple, direct, and comprehensive contrastive analysis of nozzle orifice processing methods. When processing a single orifice, the electric discharge machining method has obvious advantages. However, when there are multiple orifices, the error levels of the two methods are similar in relation to the symmetry of distribution of the orifices.

关键词： Diesel nozzle Internal structures Orifice processing methods Synchrotron X-ray micro-tomography

Substrate stiffness differentially impacts autophagy of endothelial cells and smooth muscle cells

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Bioactive Materials 2021年第5期6卷 1413-1422页

作者： Mi hu Fan Jia Wei-Pin huang Xu Li deng-Feng hu Jing Wang Ke-Feng Ren Guo-Sheng Fu Yun-Bing Wang Jian Ji MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou310027China Key Laboratory of Cardiovascular Intervention and Regenerative Medicine of Zhejiang Province Department of CardiologySir Run Run Shaw HospitalZhejiang UniversityHangzhou310016China National Engineering Research Center for Biomaterials Sichuan UniversityChengdu610064China

Stiffening of blood vessels is one of the most important characteristics in the process of many cardiovascular pathologies such as atherosclerosis,angiosteosis,and vascular *** stiffness of the vascular extracellular matrix drives artery pathology and alters phenotypes of vascular *** how substrate stiffness impacts vascular cell behaviors is of great importance to the biomaterial design in tissue engineering,regenerative medicine,and medical *** we report that changing substrate stiffness has a significant impact on the autophagy of vascular endothelial cells(VECs)and smooth muscle cells(VSMCs).Interestingly,our findings demonstrate that,with the increase of substrate stiffness,the autophagy level of VECs and VSMCs showed differential changes:endothelial autophagy levels reduced,leading to the reductions in a range of gene expression associated with endothelial function;while,autophagy levels of VSMCs increased,showing a transition from contractile to the synthetic *** further demonstrate that,by inhibiting cell autophagy,the expressions of endothelial functional gene were further reduced and the expression of VSMC calponin increased,suggesting an important role of autophagy in response of the cells to the challenge of microenvironment stiffness *** the underlying mechanism requires further study,this work highlights the relationship of substrate stiffness,autophagy,and vascular cell behaviors,and enlightening the design principles of surface stiffness of biomaterials in cardiovascular practical applications.

关键词： Substrate stiffness Autophagy Endothelial cells Smooth muscle cells Polyelectrolyte film

Single crystal growth and characterization of 166-type magnetic kagome metals

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Chinese Physics B 2024年第9期33卷 145-150页

作者： huangyu Wu Jinjin Liu Yongkai Li Peng Zhu Liu Yang Fuhong Chen deng hu Zhiwei Wang Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Zhuhai 519000China Material Science Center Yangtze Delta Region Academy of Beijing Institute of TechnologyJiaxing 314011China

Kagome magnets were predicted to be a good platform to investigate correlated topology band structure,Chern quantum phase,and geometrical frustration due to their unique lattice *** we reported single crystal growth of 166-type kagome magnetic materials,including HfMn_(6)Sn_(6),ZrMn_(6)Sn_(6),GdMn_(6)Sn_(6)and GdV_(6)Sn_(6),by using the flux method with Sn as the *** them,HfMn_(6)Sn_(6)and ZrMn_(6)Sn_(6)single crystals were grown for the first time.X-ray diffraction measurements reveal that all four samples crystallize in HfFe6Ge6-type hexagonal structure with space group P6/*** samples show metallic behavior from temperature dependence of resistivity measurements,and the dominant carrier is hole,except for GdV6Sn6 which is electron *** samples have magnetic order with different transition temperatures,HfMn_(6)Sn_(6),ZrMn_(6)Sn_(6)and GdV_(6)Sn_(6)are antiferromagnetic with TN of 541 K,466 K and 4 K respectively,while GdMn_(6)Sn_(6)is ferrimagnetic with the critical temperature of about 470 *** study will enrich the research platform of magnetic kagome materials and help explore the novel quantum phenomena in these interesting *** dataset of specific crystal structure parameters for HfMn_(6)Sn_(6)are available in Science Data Bank,with the link.

关键词： kagome metal single crystal growth crystal structure physical property