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Modeling and scenario prediction of a natural gas demand system based on a system dynamics method

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Petroleum Science 2018年第4期15卷 912-924页

作者： Xian-Zhong Mu Guo-hao Li guang-Wen Hu Institute of Recycling Economy Beijing University of Technology

Based on the study of the relationship between structure and feedback of China’s natural gas demand system, this paper establishes a system dynamics model. In order to simulate the total demand and consumption structure of natural gas in China, we set up seven scenarios by changing some of the parameters of the model. The results showed that the total demand of natural gas would increase steadily year by year and reach in the range from 3600 to 4500 billion cubic meters in 2035. Furthermore, in terms of consumption structure, urban gas consumption would still be the largest term, followed by the gas consumption as industrial fuel, gas power generation and natural gas chemical industry. In addition, compared with the population growth, economic development still plays a dominant role in the natural gas demand growth, the impact of urbanization on urban gas consumption is significant, and the promotion of natural gas utilization technology can effectively reduce the total consumption of natural gas.

关键词： Natural gas demand system System dynamics Scenario prediction Consumption structure

Characterization of electrode fouling during electrochemical oxidation of phenolic pollutant

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Frontiers of Environmental Science & Engineering 2021年第4期15卷 99-108页

作者： Xuefeng Liu Shijie You Fang ma hao Zhou State Key Laboratory of Urban Water Resource and Environment Harbin Institute of TechnologyHarbin150090China Conservation Center Shanghai MuseumShanghai200231China

Electrode fouling is a problem that commonly occurs during electro-oxidation water *** study focused on identifying the fouling behavior of Pt electrode associated with the formation of polymeric layer during electro-oxidation of *** in situ electrochemical measurements and non-destructive observation of the electrode morphology were *** results demonstrated that the electrode fouling was highly dependent on thermodynamic process of electrode that was controlled by anode *** anode potential lower than 1.0 V vs SHE,the direct electro-oxidation caused the electrode fouling by the formation of polymeric *** fouling layer decreased the electrochemically active surface area from 8.38 cm^(2)to 1.57 cm^(2),indicated by the formation of polymeric film with thickness of 2.3µm,increase in mass growing at a rate of 3.26µg/cm^(2)/*** degree to which the anode was fouled was independent of anion in the *** comparison,at anode potential higher than 2.7 V vs SHE,the anions(e.g.,chloride)could exert a major influence to the behavior of electrode *** presence of chloride was shown to mitigate the fouling of electrode significantly through preventing the formation of polymeric film by active chlorine(e.g.,Cl•and Cl_(2))produced from anodic oxidation of *** chloride is the most abundant anionic species existing in both natural and engineered water system,this study not only offers a deep insight into the mechanism of electrode fouling,but also suggests strategies for anti-fouling in the presence of chloride in electro-oxidation process.

关键词： Electro-oxidation Electrode fouling Polymeric film Chloride ions

Reduce the decoding complexity: segment linear network coding

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The Journal of China Universities of Posts and Telecommunications 2013年第6期20卷 55-61页

作者： GUO Yi-jun hao Jian-jun YUE guang-xin School of Telecommunication Engineering Beijing University of Posts and Telecommunications

The throughput gain obtained by linear network coding （LNC） grows as the generation size increases, while the decoding complexity also grows exponentially. High decoding complexity makes the decoder to be the bottleneck for high speed and large data transmissions. In order to reduce the decoding complexity of network coding, a segment linear network coding （SLNC） scheme is proposed. SLNC provides a general coding structure for the generation-based network coding. By dividing a generation into several segments and restraining the coding coefficients of the symbols within the same segment, SLNC splits a high-rank matrix inversion into several low-rank matrix inversions, therefore reduces the decoding complexity dramatically. In addition, two coefficient selection strategies are proposed for both centrally controlled networks and distributed networks respectively. The theoretical analysis and simulation results prove that SLNC achieves a fairly low decoding complexity at a cost of rarely few extra transmissions.

关键词： SLNC generation-based network coding random LNC decoding complexity extra transmission cost

Divalent nitrogen-rich cationic salts with great gas production capacities

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Defence Technology（防务技术） 2023年第4期22卷 54-68页

作者： hao Gu Cheng-chuang Li Chang-hao Dai Dong-xu Chen Hong-wei Yang guang-bin Cheng School of Chemistry and Chemical Engineering Nanjing University of Science and TechnologyXiaolingwei 200Nanjing210094PR China

Monocyclic nitrogen-rich 3-(aminomethyl)-4,5-diamine-1,2,4-triazole(1)and fused cyclic 3,7-diamine-6-(aminomethyl)-[1,2,4]triazolo[4,3-b][1,2,4]triazole(9)were synthesized through the convenient cyclization reaction from the readily available *** energetic salts with high nitrogen content were proved to be rare examples of divalent monocyclic/fused cyclic cationic salts according to the single crystal *** structure of intermediate B was also identified and verified by its trivalent cation crystal 17.5H_2O *** compounds 2-8 and 10-17 were fully characterized by NMR spectroscopy,infrared spectroscopy,differential scanning calorimetry,elemental *** energetic salts exhibit good thermal stability with decomposition temperatures ranged from 182℃to 245℃.The sensitivity of compounds 2,6,10 and 14 is similar or superior to that of RDX while the others were much more insensitive to mechanical ***,detonation velocity of 10(8843 m/s)surpass that of RDX(D=8795 m/s).Considering the high gas production volume(≥808 L/kg)of 2,4,10and 12,constant-volume combustion experiments were conduct to evaluate their gas production capacities *** compounds possess much higher maximum gas-production pressures(P_(max):7.88-10.08 MPa)than the commonly used reagent guanidine nitrate(GN:P_(max)=4.20 MPa),which indicate their strong gas production capacity.

关键词： Fused cyclic compound Triazole Divalent cation Gas production Energetic materials

Inverse Proportion Technique Based Scheduling Strategy for Energy Storage System Considering Load Demand Differences

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CSEE Journal of Power and Energy Systems 2022年第5期8卷 1487-1496页

作者： Hejun Yang Zhenyu hao Yinghao ma Dabo Zhang Anhui Provincial Key Laboratory of Renewable Energy Utilization and Energy Saving Hefei University of TechnologyHefei 230009China State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqing 400044Chin

The energy storage system(ESS)as a demand-side management(DSM)resource can effectively smooth the load power fluctuation of a power ***,designing a more reasonable ESS operational strategy will be a prerequisite before incorporating the energy storage device into *** different load levels have different demands for the real-time chargedischarge power of an ESS,this paper proposes a heuristic ESS operation scheduling strategy which can take into account the electrical load demand *** this paper,firstly,two demand degree concepts for charging power and discharging power are defined to describe the differentiated ESS demand under the condition of different electrical load ***,an inverse proportion technique based ESS scheduling strategy,with the consideration of the load demand difference,is proposed in this ***,some evaluating indices are defined in this paper for describing the influence of the proposed strategy on the smoothing degree of the daily load ***,several case studies are designed to verify the validity and correctness of the proposed technique,and the results show that the proposed technique can effectively smooth the load curve and improve the ability of peak shaving and valley filling.

关键词： Demand response energy storage system load demand difference operation scheduling strategy peak shaving and valley filling

Effect of Heavy Metals （Cd, Cu） on the Gametophytes of Laminaria japonica Aresch

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Journal of Integrative Plant Biology 2005年第8期47卷 942-951页

作者： Nai-hao YE guang-Ce WANG Cheng-Kui TSENG Key Laboratory of Experimental marine Biology Institute of Oceanology the Chinese Academy of Sciences Qingdao 266071 China Graduate School the Chinese Academy of Sciences Beijing 100039 China

Effects of various concentrations of two heavy metals, namely Cd and Cu, on gametophytes of Laminariajaponica Aresch were determined by recording morphological changes of gametophytes, determining pH values and the heavy metal content of the culture solution, calculating the germination rate of sporophytes, and observing heavy metal （Cd） distribution using a fluorescence microscope. The results showed that heavy metals damaged the gametophytes, and were even lethal, and that the higher the concentration of heavy metal ions, the greater the injury to gametophytes. Gametophytes could not survive in culture solutions containing more than 100 mg/L Cd and 50 mg/L Cu and were only able to survive in culture solution containing a mixture of Cd and Cu up to a concentration of 10 mg/L, which indicates that gametophytes have a higher tolerance to Cd than Cu and that multiple heavy metal ions in solution markedly aggravate the damage to gametophytes compared with individual heavy metal ions. With increases in the concentration of the heavy metal, the burgeoning rate of sporophytes decreased acutely, and solutions containing multiple heavy metal ions caused even more marked harm to sporophytes than solutions containing a single heavy metal ion, because most sporophytes died in mixed solutions. The pH value of the culture medium dropped immediately at the beginning （the first day） of treatment, increased over the following days, and then decreased again. The pH of culture media containing multiple heavy metal ions showed greater variation than media containing a single heavy metal ion, with the extent of the decrease in pH of culture media containing multiple ions being greatest during the last period of the experiment. With increases in the concentration of heavy metals, the capacity of gametophytes to accumulate these ions increased. The blue fluorescent light emitted by the Cd-and Cd-binding protein complex existing in gametophytes in media containing different concentrations

关键词： Cd Cu gametophyte heavy metals Laminariajaponica.

KdV Equation with Self-consistent Sources in Non-uniform Media

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Communications in Theoretical Physics 2009年第6期51卷 989-999页

作者： hao Hong-Hai WANG guang-Sheng ZHANG Da-Jun Department of mathematics Shanghai University Shanghai 200444 China Department of Basic Courses Nanjing Institute of Technology Nanjing 211167 China

Two non-isospectral KdV equations with self-consistent sources are derived. Gauge transformation between the first non-isospectral KdV equation with self-consistent sources （corresponding to λt = -2aA） and its isospectral counterpart is given, from which exact solutions for the first non-isospectral KdV equation with self-consistent sources is easily listed. Besides, the soliton solutions for the two equations are obtained by means of Hirota＇s method and Wronskian technique, respectively. Meanwhile, the dynamical properties for these solutions are investigated.

关键词： non-isospectral KdV equation with self-consistent sources gauge transformation Hirota's method Wronskian technique dynamics

Fatigue crack growth of titanium alloy joints by electron beam welding

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Rare Metals 2014年第5期33卷 516-521页

作者： Hong-Yu Qi hao Shi Shao-Lin Li Xiao-guang Yang School of Jet Propulsion Beijing University of Aeronautics and Astronautics

Electron beam welding（EBW） has been widely used in the manufacture of titanium alloy welded blisk for aircraft engines. Based on fatigue crack growth tests on titanium alloy electron beam welding（EBW） joints, mechanism of fracture was investigated under scanning electron microscope（SEM）. The results show that fatigue crack growth rate increases as the experimental load increases under the same stress ratio and stress intensity factor range. At the beginning of crack growth, the extension mechanism of fatigue crack is the typical mechanism of cleavage fracture. In the steady extention stage, crack extends along the weld seam ***, crack growth direction changes to extend along the base metal. The extension mechanism of fatigue crack in the weld seam is the main mechanism of cleavage fracture and the extension mechanism of fatigue crack in the base metal is the main extension mechanism of fatigue band. In the instantaneous fracture stage, the extension mechanism of fatigue crack is the typical dimple-type static fracture *** growth was simulated by conventional finite element method and extended finite element method.

关键词： Microforming Ti–6Al–4V alloy Electron beam welding Fatigue crack growth Fracture analysis

Facile Synthesis of 3D Porous Flower-like ZnO Micro/nanostructure Films and Their Photocatalytic Performance

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Chinese Journal of Chemical Physics 2012年第3期25卷 339-344,374页

作者： Jin-ling Yang guang Tao Fei Hui Li hao-miao Ouyang Key Laboratory of materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology Institute of Solid State Physics Hefei Institutes of Physical Science Chinese Academy of SciencesHefei 230031 China

3D porous flower-like ZnO micro/nanostructure films grown on Ti substrates are synthesized via a very facile electrodeposition technique followed by heat treatment process. The ZnO architecture is assembled with ultra thin sheets, which consist of numbers of nanoparticles and pores, and the size of the nanoparticles can be controlled by adjusting the electrodepo- sition time or calcination temperature. It is worth noting that this synthetic method can provide an effective route for other porous metal oxide nanostructure films. Moreover, the photocatalytic performance shows the porous ZnO is an ideal photocatalyst.

关键词： Zinc oxide porous film Photocatalyst Micro/nanostructure Electrodeposition