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Fluid Dynamics & Materials Processing 2024年第8期20卷 1731-1741页

作者： Nannan Liu hengchen Qi Hui Xu yanfeng he School of Petroleum and Natural Gas Engineering Changzhou UniversityChangzhou213164China

Low salinity water containing sulfate ions can significantly alter the surface wettability of carbonate ***,the impact of sulfate concentration on the desorption of oil film on the surface of carbonate rock is still *** study examines the variations in the wettability of the surface of carbonate rocks in solutions containing varying amounts of sodium sulfate and pure *** problem is addressed in the framework of molecular dynamics simulation(Material Studio software)and *** experiment’s findings demonstrate that sodium sulfate can increase the rate at which oil moisture is turned into water *** final contact angle is smaller than that of pure *** results of the simulations show that many water molecules travel down the water channel under the influence of several powerful forces,including the electrostatic force,the van der Waals force and hydrogen bond,crowding out the oil molecules on the calcite’s surface and causing the oil film to *** relative concentration curve of water and oil molecules indicates that the separation rate of the oil film on the surface of calcite increases with the number of sulfate ions.

关键词： Carbonate rocks wettability sulfate ions concentration molecular simulation desorption

Synergetic process between wind power and sewage sludge pyrolysis in a novel renewable-energy microgrid system

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Clean Energy 2023年第3期7卷 493-508页

作者： Chang Liu Jiankun Zhuo yanfeng he Shuiqing Li Qiang Yao Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Tsinghua UniversityBeijing 100084China Beijing Engineering Research Center for Ecological Restoration and Carbon Fixation of Saline-alkaline and Desert Land Tsinghua UniversityBeijing 100084China

To relieve the stress of sewage sludge(SS)disposal and effectively increase the use of renewable energy,a novel renewable-energy microgrid system(REMS)was developed,specifically designed to integrate a wind power plant(WPP)with energy storage and the SS pyrolysis process for heat and power *** on a lab-scale pyrolysis experiment and 7-day numerical analysis,we studied the energy-recycling potential of SS and simulated the operational behaviours of *** to the results,the calorific values of the pyrolytic gaseous and liquid products were better than those of the raw material,at 16.19 and 33.53 MJ/kg,*** proposed REMS performed well in power supply and energy utilization with a design performance index of 99.23 when the WPP capacity was 200 MWe and the initial wind-energy curtailment rate was 30%.It indicates that by converting SS into flammable gas,condensable liquid and carbon-rich solid residue,curtailed wind energy could be saved and the synergy between wind power and the SS pyrolysis process enabled the proposed microgrid system to effectively utilize renewable energy and provide reliable on-demand power *** REMS installed with a 155-MWe WPP achieved the optimal design in system performance,environmental benefit and construction cost under the initial wind-curtailment rate of 34.12%.The design scheme makes REMS capable of satisfying the 15.10-GWh power demand of end users and the 1700-t/day SS disposal need,and the curtailed wind energy could be reduced to zero.

关键词： sewage sludge pyrolysis wind power microgrid flexible operation

Synthesis and molecular recognition characteristics of a tetrapodal benzene cage

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Chinese Chemical Letters 2024年第8期35卷 240-244页

作者： Caihong Mao yanfeng he Xiaohan Wang Yan Cai Xiaobo Hu Key Laboratory of the Ministry of Education for Advanced Catalysis Materials College of Chemistry and Materials ScienceZhejiang Normal UniversityJinhua 321004China

In this contribution,we describe the preparation and recognition characteristics of a novel tetrapodal benzene cage(1).The cage can express a wide recognition range without losing selectivity for the object of appropriate size and functional *** key to obtaining the desired structural isomer of 1 is the synthesis and isolation of the o-bis(bromomethyl)benzene precursor(5).Three distinct guests,F^(−)(ex-tremely small size),d-lactate(appropriate size)and l-Asp(branched shape),were selected as examples to demonstrate the recognition characteristics of *** NMR titration studies,they all expressed good binding affinity(K>10^(5) L/mol)in competitive medium(10%DMSO/THF),indicating that 1 has a wide recognition *** highest binding constant was observed for d-lactate,revealing that 1 has good selectivity for d-lactate versus F^(−)and ***,the NMR titration study of F^(−)in DMSO indicates 1 can achieve different binding modes(1:1 and 2:1 guest-host)for small-sized guests,which allows for the further development of binary binding properties and thereafter applications in the field of catalysis.

关键词： Cage molecules Host-guest chemistry Multi-step organic synthesis d-Lactate recognition l-Asp recognition

Influence of N doping and the functional groups of graphene on a RGO/TiO2 composite photocatalyst

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Science China(Technological Sciences) 2020年第6期63卷 1045-1054页

作者： TANG Bo he yanfeng ZHANG ZhenYu WANG ZhengWei JI Li MA TingTing LI Sen DAI YuanZhe ZHANG GuoLiang School of Petroleum Engineering Changzhou UniversityChangzhou 213016China

Reduced graphene oxide(RGO)assisted TiO2 composite photocatalysts have attracted increased attention because of their high photocatalytic performance under both UV-and visible-light ***,the corresponding properties under the long wavelength irradiation is far from *** this study,a series of RGO samples with well-designed N impurity and optimized surface functional groups are prepared and employed during hybridization with TiO2(named N-RGO/TiO2).The coupling between the doped N atoms and surface functional groups is analyzed based on the resulting photocatalytic performances,and the specific mechanism is revealed by the EPR,IR and lifetime of the photoinduced *** comparing the corresponding performances of the RGO/TiO2 and RGO/N-TiO2 specimens,the results show that the surface functional groups of the RGO serve as a precondition to achieveπ-d coupling between the graphene basal plane and TiO2 nanoparticles,while N atoms in the RGO enhance the resulting photoactivity under a long wavelength range(>510 nm).The findings provide a potential approach to promote the photocatalytic properties of graphene-based composite photocatalysts with the low-energy incident photons.

关键词： graphene surface functional group N doping coupling photocatalyst

Certification Institutions Expected to Update and Transfer Information on Present Standards

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China Standardization 2008年第1期53卷 24-25页

作者： Zeng Jiansan he yanfeng

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision. It is important for certification institutions to explore methods for updating and transferring present standards, to accelerate the transfer of standard information and ensure present standards are implemented in a timely manner.

关键词： In Certification Institutions Expected to Update and Transfer Information on Present Standards

Preparation and Characterization of Ion Exchange Resin-Supported Nickel Boride Catalysts

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分子催化 1997年第4期 2-3页

作者： he yanfeng LIANG Zhencheng LIAO Qiaoli QIN Yongning (Department of Chemical Engineering Tianjin University Tianjin 300072)

ＰｒｅｐａｒａｔｉｏｎａｎｄＣｈａｒａｃｔｅｒｉｚａｔｉｏｎｏｆＩｏｎＥｘｃｈａｎｇｅＲｅｓｉｎＳｕｐｐｏｒｔｅｄＮｉｃｋｅｌＢｏｒｉｄｅＣａｔａｌｙｓｔｓＨＥＹａｎｆｅｎｇＬＩＡＮＧＺｈｅｎｃｈｅｎｇＬＩＡＯＱｉ... 详细信息

ＰｒｅｐａｒａｔｉｏｎａｎｄＣｈａｒａｃｔｅｒｉｚａｔｉｏｎｏｆＩｏｎＥｘｃｈａｎｇｅＲｅｓｉｎＳｕｐｐｏｒｔｅｄＮｉｃｋｅｌＢｏｒｉｄｅＣａｔａｌｙｓｔｓＨＥＹａｎｆｅｎｇＬＩＡＮＧＺｈｅｎｃｈｅｎｇＬＩＡＯＱｉａｏｌｉＱＩＮＹｏｎｇｎｉｎｇ（Ｄ...

关键词： Nickel boride catalyst Ion exchange resin Dehydrogenation of 2 propanol

Intelligent Recognition Method of Insufficient Fluid Supply of Oil Well Based on Convolutional Neural Network

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Open Journal of Yangtze Oil and Gas 2021年第3期6卷 116-128页

作者： yanfeng he Zhenlong Wang Bin Liu Xiang Wang Bingchao Li China University of Petroleum Beijing China Changzhou University Jiangsu China Oilfield Exploration and Development Management Shandong China China University of Petroleum Qingdao China

Traditional methods for judging the degree of insufficient fluid supply in oil wells have low efficiency and limited accuracy. To address this problem, a method for intelligently identifying the degree of insufficient fluid supply in oil wells based on convolutional neural networks is proposed in this paper. Firstly, 5000 indicator diagrams with insufficient liquid supply were collected from the oilfield site, and a sample set was established after preprocessing;then based on the AlexNet model, combined with the characteristics of the indicator diagram, a convolutional neural network model including 4 layers of convolutional layers, 3 layers of down-pooling layers and 2 layers of fully connected layers is established. The backpropagation, ReLu activation function and dropout regularization method are used to complete the training of the convolutional neural network;finally, the performance of the convolutional neural network under different iteration times and network structure is compared, and the super parameter optimization of the model is completed. It has laid a good foundation for realizing the self-adaptive and intelligent matching of oil well production parameters and formation fluid supply conditions. It has certain application prospects. The results show that the accuracy of training and verification of the method exceeds 98%, which can meet the actual application requirements on site.

关键词： Degree of Insufficient Fluid Supply in Oil Wells Indicator Diagram Convolutional Neural Network Alexnet Backpropagation Algorithm ReLu Activation Function Dropout Regularization

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带中转设施的垃圾收集VRP的改进蚁群算法

西南交通大学学报 2011年第2期46卷 333-339页

作者：刘洁刘丹何彦锋西南交通大学地球科学与环境工程学院四川成都610031 中国水电顾问集团成都勘测设计研究院四川成都610072

为减少城市垃圾的收运成本和各车辆路径之间的重叠区域,设计了一种具有聚类策略、改进全局信息素更新规则和交叉算子的多重蚁群算法.用该算法求解2个标准算例,一个达到目前已知的最优解,另一个偏离度为2.13%.此外,还对含有不同规则的蚁... 详细信息

为减少城市垃圾的收运成本和各车辆路径之间的重叠区域,设计了一种具有聚类策略、改进全局信息素更新规则和交叉算子的多重蚁群算法.用该算法求解2个标准算例,一个达到目前已知的最优解,另一个偏离度为2.13%.此外,还对含有不同规则的蚁群算法进行了比较.结果表明:与不带聚类策略的蚁群算法相比,该算法求解的路径最佳,其长度缩短4.90%,紧凑度降低83.33%;不同转移更新规则的贡献程度从大到小依次是:带块可见度的聚类策略、全局信息素更新规则和交叉算子.

关键词：城市垃圾收运蚁群算法聚类策略逆向物流

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驰名商标的营造与法律保护

南方经济 2001年第6期30卷 27-29页

作者：何衍锋佛山市工商行政管理局局长广东佛山528000

我国即将加入WTO ,这是一个营造中国自己的世界级驰名商标难得的机遇。实施营造驰名商标战略 ,主要从市场占有率、营销策略、名牌意识、树立形象及其开拓创新等五个方面着眼。对驰名商标的法律保护 ,笔者认为应从如下三个方面着手 :第... 详细信息

我国即将加入WTO ,这是一个营造中国自己的世界级驰名商标难得的机遇。实施营造驰名商标战略 ,主要从市场占有率、营销策略、名牌意识、树立形象及其开拓创新等五个方面着眼。对驰名商标的法律保护 ,笔者认为应从如下三个方面着手 :第一 ,确立驰名商标特殊保护的原则 ;第二 ,加强对驰名商标在诉讼与行政处罚等制度中的特殊保护 ;第三 ,明确联合商标和防御商标制度。

关键词：驰名商标注册商标法律保护商标法

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两个数论函数的混合均值公式

黑龙江大学自然科学学报 2008年第4期25卷 477-479页

作者：贺艳峰西北大学数学系

对任意正整数n,Smarandache函数V(n)定义为:V(1)=U(1)=1;n>1时,令n=p1α1p2α2…prαr是n的标准分解式,则V(n)=min(1≤i≤r){α1·p1,α2·p2,…,αr·pr};U(n)=max(1≤i≤r){α1·p1,α2·p2,…,αr·pr}.利用素数函数π(x)和Riemannzeta-函数ζ(s)的解析性质,通过分区间讨论的方法研究了两个Smarandache函数U(n)与V(n)的混合均值,并给出了它的一个渐近公式。

关键词： Smarandache函数 Abel恒等式 Riemannzeta一函数