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Frontiers in Energy 2024年第1期18卷 89-100页

作者： Zhouzhou wang Qingwei WU jieming wang Ying YU Institute of Nanoscience and Nanotechnology College of Physical Science and TechnologyCentral China Normal UniversityWuhan 430079China

Hydrogen production from photoelectrochemical(PEC)water splitting has been regarded as a promising way to utilize renewable and endless solar ***,semiconductor film grown on photoelectrode suffers from numerous challenges,leading to the poor PEC ***,a straightforward sol-gel method with the ligand-induced growth strategy was employed to obtain dense and homogeneous copper bismuthate photocathodes for PEC hydrogen evolution *** various characterizations,it was found that the nucleation and surface growth of CuBi_(2)O_(4)layer induced by 2-methoxyethanol ligand(2-CuBi_(2)O_(4))demonstrated a decent crystallinity and coverage,as well as a large grain size and a low oxygen vacancy concentration,leading to the good ability of light absorption and carrier ***,under simulated sunlight irradiation(AM1.5G,100 mW/cm^(2)),the 2-CuBi_(2)O_(4)photocathode achieved an enhanced photocurrent density of−1.34 mA·cm^(−2)at 0.4 V versus the reversible hydrogen electrode and a promising applied bias photon-to-current efficiency of 0.586%.This surface modification by ligand growth strategy will shed light on the future design of advanced photoelectrodes for PEC water splitting.

关键词： copper bismuthate photocathode ligand growth strategy dense film PEC

Fermi-level-tuned MOF-derived N-ZnO@NC for photocatalysis:A key role of pyridine-N-Zn bond

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Journal of Materials Science & Technology 2022年第17期112卷 68-76页

作者： Zheao Huang Qiancheng Zhou jieming wang Ying Yu Institute of Nanoscience and Nanotechnology College of Physical Science and TechnologyCentral China Normal UniversityWuhan 430079China

For photocatalytic materials,the composites formed by metal oxides and heteroatom-doped carbon have outstanding *** them,metal-organic framework(MOF)derived composites,usually composed of metal oxide and nitrogen-doped carbon,is not only simple to prepare,but also have far-exceeding catalytic performance than homogenous ***,the relationship between the structure and performance in the photocatalytic system is still not ***,we explored the tunable nitrogen configurations in sample N-ZnO@NC by controlling the thermal conversion of ***,through exsitu and in-situ XPS characterization,it is found that the ZnO and nitrogen-doped carbon in N-ZnO@NC are connected by C-N-Zn bond,which enhances charge separation efficiency and becomes the origin of superior photocatalytic *** calculations further reveal the influence of different Zn-bonding nitrogen configurations on the adjusting of Fermi level and electron *** study exhibits that the pyridine-N configuration in MOF-derived material is the main contributor for the improved performance and tunes Fermi level more appropriately than the pyrrolic-N,which can hold the key for future design of next-generation photocatalysts.

关键词： MOF-derived material Fermi level Pyridine-N-Zn DFT calculations Photocatalysis

“Extreme utilization” theory and practice in gas storages with complex geological conditions

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Petroleum Exploration and Development 2023年第2期50卷 419-432页

作者： MA Xinhua ZHENG Dewen DING Guosheng wang jieming PetroChina Research Institute of Petroleum Exploration and Development Beijing 100083China CNPC Key Laboratory of Oil&Gas Underground Storage Engineering Langfang 065007China

Based on more than 20-year operation of gas storages with complex geological conditions and a series of research findings, the pressure-bearing dynamics mechanism of geological body is revealed. With the discovery of gas-water flowing law of multi-cycle relative permeability hysteresis and differential utilization in zones, the extreme utilization theory targeting at the maximum amount of stored gas, maximum injection-production capacity and maximum efficiency in space utilization is proposed to support the three-in-one evaluation method of the maximum pressure-bearing capacity of geological body, maximum well production capacity and maximum peak shaving capacity of storage space. This study realizes the full potential of gas storage(storage capacity) at maximum pressure, maximum formation-wellbore coordinate production, optimum well spacing density match with finite-time unsteady flow, and peaking shaving capacity at minimum pressure, achieving perfect balance between security and capacity. Operation in gas storages, such as Hutubi in Xinjiang, Xiangguosi in Xinan, and Shuang6 in Liaohe, proves that extreme utilization theory has promoted high quality development of gas storages in China.

关键词： underground gas storage gas-storage geological body maximum pressure-bearing maximum well production capacity maximum peak shaving capacity extreme utilization theory multi-cycle relative permeability hysteresis

基于建筑符号学理论的湘西民居建筑符号构成研究

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湖南包装 2024年第2期39卷 75-78页

作者：黄锦辉汪结明李瑞雪湖南科技大学建筑与艺术设计学院湖南湘潭411100

从古至今,传统民居作为体现地域文化不可或缺的一部分,蕴含着中华优秀传统文化。文章从建筑符号学视角对湘西传统民居建筑符号、特点进行研究。首先从传统习俗、图形纹样等对地域符号的形成作出分析,从图像符号、指示符号、象征符号3个... 详细信息

从古至今,传统民居作为体现地域文化不可或缺的一部分,蕴含着中华优秀传统文化。文章从建筑符号学视角对湘西传统民居建筑符号、特点进行研究。首先从传统习俗、图形纹样等对地域符号的形成作出分析,从图像符号、指示符号、象征符号3个角度对湘西民居建筑符号的构成进行分析,总结出湘西民居建筑符号的类型、特征、优点以及内在含义。通过对湘西民居建筑符号的构成研究提出湘西民居建筑符号更好地与现代社会和科学技术相融合并且进行创新构思、文化传承等策略。

关键词：湘西传统民居建筑符号图像符号指示符号象征符号

An analysis method of injection and production dynamic transient flow in a gas field storage facility

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Petroleum Exploration and Development 2022年第1期49卷 179-190页

作者： wang jieming LI Chun SUN Junchang TANG Ligen ZHONG Rong LIU Xianshan ZHENG Shaojing PetroChina Research Institute of Petroleum Exploration&Development Langfang 065007China Key Laboratory of Oil and Gas Underground Storage Project of China National Petroleum Corporation Langfang 065007China

A dynamic transient flow analysis method considering complex factors such as the cyclic injection and production history in a gas field storage facility was established in view of the limitations of the existing methods for transient flow analysis and the characteristics of the injection-production operation of strongly heterogeneous gas reservoirs, and the corresponding theoretical charts were drawn. In addition, an injection-production dynamic transient flow analysis model named "three points and two stages" suitable for an underground gas storage(UGS) well with alternate working conditions was proposed. The "three points" refer to three time points during cyclic injection and production, namely, the starting point of gas injection for UGS construction, the beginning and ending points of the injection-production analysis stage;and the "two stages" refer to historical flow stage and injection-production analysis stage. The study shows that the dimensionless pseudo-pressure and dimensionless pseudo-pressure integral curves of UGS well flex downward in the early stage of the injection and production process, and the dimensionless pseudo-pressure integral derivative curve is convex during the gas production period and concave during the gas injection period, and the curves under different flow histories have atypical features. The new method present in this paper can analyze transient flow of UGS accurately. The application of this method to typical wells in Hutubi gas storage shows that the new method can fit the pressure history accurately, and obtain reliable parameters and results.

关键词： gas field storage facility injection and production performance alternate working conditions transient flow analysis theoretical chart

Simulation of petroleum phase behavior in injection and production process of underground gas storage in a gas reservoir

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Petroleum Exploration and Development 2022年第6期49卷 1386-1397页

作者： wang jieming SHI Lei ZHANG Yu ZHANG Ke LI Chun CHEN Xianxue SUN Junchang QIU Xiaosong PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China Key Laboratory of Oil and Gas Underground Storage Project of China National Petroleum Corporation Langfang 065007China China University of Petroleum Beijing 102249China State Key Laboratory of Heavy Oil Processing Beijing 102249China State Key Laboratory of Enhanced Oil Recovery Beijing 100083China PetroChina Liaohe Oilfield Company PetroChinaPanjin 124010China

On the basis of analyzing the fluid phase behavior during the transformation from gas reservoir to gas storage,a mathematical model and an experimental simulation method are established to describe the oil-gas phase behavior during the whole injection-production process of gas *** underground gas storage in the Liaohe Shuang 6 gas reservoir with oil rim is taken as a typical example to verify the reliability and accuracy of the mathematical model and reveal characteristics and mechanisms of fluid phase *** the gas injection stage of the gas storage,the phase behavior is characterized by mainly evaporation and extraction and secondarily dissolution and diffusion of gas in the cap to oil in the oil rim of the reservoir;the gas in gas cap increases in light component content,decreases in contents of intermediate and heavy components,and increases in density and *** oil of the ring decreases in content of heavy components,increases in contents of light and intermediate components,decreases in density and viscosity,and increases in volume factor and solution gas oil *** the stable operation stage of periodic injection-production of gas storage,the phase behavior shows that the evaporation and extraction capacity of injection gas in the cap to oil rim is weakened step by step,the phase behavior gradually changes into dissolution and *** gas in gas cap decreases in content of intermediate components,increases in content of light components slowly,and becomes lighter;but changes hardly in density and *** oil in the oil rim increases in content of heavy components,decreases in content of intermediate components,rises in density and viscosity,and drops in volume factor and solution gas oil ratio.

关键词： underground gas storage phase behavior characteristic mathematical model experimental simulation action mechanism

大长度高压直流电缆中电荷的产生、测量及释放研究综述

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四川电力技术 2024年第1期47卷 50-58页

作者：王洁铭刘巧珏崔智桐蔡致坤胡武生南京航空航天大学自动化学院江苏南京211106 台达电子企业管理(上海)有限公司上海201209 上海华为技术有限公司上海201206 国电南瑞科技股份有限公司江苏南京211100

碳减排作为能源转型的核心驱动力之一,能够有效促进清洁能源发展,缓解全球温室效应。在全球能源互联网发展的背景之下,用于长距离、跨地区输电的大长度直流电缆在电力互联网中占据着重要地位。同时,直流电缆工作时间较长,维护工作较为困... 详细信息

碳减排作为能源转型的核心驱动力之一,能够有效促进清洁能源发展,缓解全球温室效应。在全球能源互联网发展的背景之下,用于长距离、跨地区输电的大长度直流电缆在电力互联网中占据着重要地位。同时,直流电缆工作时间较长,维护工作较为困难,而电缆中又不可避免会出现电荷积累问题,其中的残余电荷将威胁电缆的安全运行,降低电缆的使用寿命,甚至可能造成电缆故障。因此,有必要对大长度直流电缆的电荷问题开展相关研究。从直流电缆中电荷的产生、测量和释放3个方面进行概述,总结了近年来相关研究中的热点问题,对未来热门研究方向给出参考。所做研究对大长度直流电缆的在线监测和寿命评估均具有重要的指导意义。

关键词：高压直流电缆老化空间电荷表面电荷

Evaluation of perfluorinated compounds in seven wastewater treatment plants in Beijing urban areas

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Science China Chemistry 2011年第3期54卷 552-558页

作者： PAN YuanYuan SHI YaLi wang jieming CAI YaQi State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

The presence of perfluorinated compounds(PFCs)in seven major wastewater treatment plants(WWTPs)in Beijing was investigated in the current *** detected nine PFCs in all the wastewater and sludge *** acid(PFOA)is the dominant PFCs in influents and effluents,while perfluorooctane sulfonate(PFOS)is the major contaminant in *** highest PFC concentration was found in plants at Qinghe and Jiuxianqiao WWTP,while the lowest was found at Fangzhuang *** total values of PFC range from 2.88 to 176 ng/L in influents,from 5.48 to 498 ng/L in effluents,and from 1.21 to 32.0 ng/g(dry wt)in *** fact that effluents usually contain higher levels of PFCs than influents suggests that additional PFCs are produced during the wastewater treatment ***,PFOS decreases in effluents than in influents in 62%of the water *** may be due to the adsorption and removal of the sludge during the active *** carboxylates(PFCAs)were found significantly correlated with each other in the effluents,which may indicate their similar sources or the existence of their potential precursors in the wastewater or treatment *** mass flows of PFC discharges into WWTPs are 0.4–51.4 mg/day,and the mass flows of PFCs in effluents exceed those in influents by 127%.Domestic and commercial wastewaters are suggested to be the major sources of PFC pollution in WWTPs in Beijing.

关键词：污水处理厂全氟化合物北京城区 PFCs 评价污水处理过程全氟辛烷质量流量

Anomaly Detection Algorithm of Power System Based on Graph Structure and Anomaly Attention

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Computers, Materials & Continua 2024年第4期79卷 493-507页

作者： Yifan Gao jieming Zhang Zhanchen Chen Xianchao Chen Zhaoqing Power Supply Bureau of Guangdong Power Grid Co. Ltd.Zhaoqing526060China

In this paper, we propose a novel anomaly detection method for data centers based on a combination of graphstructure and abnormal attention mechanism. The method leverages the sensor monitoring data from targetpower substations to construct multidimensional time series. These time series are subsequently transformed intograph structures, and corresponding adjacency matrices are obtained. By incorporating the adjacency matricesand additional weights associated with the graph structure, an aggregation matrix is derived. The aggregationmatrix is then fed into a pre-trained graph convolutional neural network (GCN) to extract graph structure ***, both themultidimensional time series segments and the graph structure features are inputted into a pretrainedanomaly detectionmodel, resulting in corresponding anomaly detection results that help identify abnormaldata. The anomaly detection model consists of a multi-level encoder-decoder module, wherein each level includesa transformer encoder and decoder based on correlation differences. The attention module in the encoding layeradopts an abnormal attention module with a dual-branch structure. Experimental results demonstrate that ourproposed method significantly improves the accuracy and stability of anomaly detection.

关键词： Anomaly detection transformer graph structure

Perfluorooctane sulfonate (PFOS) and other fluorochemicals in viscera and muscle of farmed pigs and chickens in Beijing,China

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Chinese Science Bulletin 2010年第31期55卷 3550-3555页

作者： wang jieming SHI YaLi PAN YuanYuan CAI YaQi State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy ofSciences Beijing 100085 China

Eleven perfluorinated compounds(PFCs) were determined in tissue samples from farmed pigs and chickens(n=143) that were purchased in Beijing in March *** total PFCs mean concentration was the highest in pig liver(3.438 ng g-1 wet weight(ww)),followed by pig kidney(0.508 ng g-1(ww)),pig heart(0.167 ng g-1(ww)),chicken liver(0.098 ng g-1(ww)),chicken heart(0.050 ng g-1(ww)),pork loin(0.018 ng g-1(ww)),and chicken breast(0.012 ng g-1(ww)).Among the PFCs analyzed,perfluorooctane sulfonate(PFOS) was the predominant compound in viscera and muscle of farmed pigs and *** addition,a strong linear correlation(r = 0.932) was observed between the concentrations of PFOS and perfluoroundecanoic acid(PFUnDA) in pig *** preliminary conclusion is that there is little potential risk of exposure to PFCs via the consumption of these products in Beijing.

关键词：含氟化合物 PFOS 全氟辛烷猪内脏鸡肝北京养殖磺酸