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EV Response Capability Assessment Considering User Travel Demand and Cyber System Reliability

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Engineering 2022年第8期8卷 186-195页

作者： yanli liu Ke liu Xu Sun School of Electrical and Information Engineering Tianjin UniversityTianjin 300072China

With the increasing penetration rate of electric vehicles(EVs),EV demand response holds great significance for promoting the optimal and secure operation of the power *** paper proposes an EV response capability assessment method that considers EV users’travel demands and the reliability of the cyber systems integrated into both the power grid and the transportation network.A novel framework for an integrated cyber-power-transportation system is proposed for the first time,and a reliability model for the cyber system is provided.A method is further proposed to calculate the state of an EV when it is plugged in,considering the reliability of traffic guidance information and the reliability of the release of such *** degree of relaxation in the EV charging demand is proposed to reflect the user’s travel demand,based on which the EV response capability can be *** test results on a cyber-power-transportation system containing RBTS BUS6 and the Beijing transportation network are conducted to show the efficiency of the proposed *** impact of cyber reliability on the EV trip and response capability is analyzed.

关键词： Cyber system Demand response Electric vehicle

Self-assembly behavior of phenyl modified β-cyclodextrins

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Science China Chemistry 2006年第3期49卷 230-237页

作者： ZHAO yanli liu Yu Department of Chemistry State Key Laboratory of Elemento-Organic Chemistry Nankai University Tianjin 300071 China Department of Chemistry State Key Laboratory of Elemento-Organic Chemistry Nankai University Tianjin 300071 China

The self-assembly behavior of mono(6-phenolic-6-deoxy)-β-cyclodextrin bothin solution and the solid state is comparatively studied by X-ray crystallography and ~1H NMRspectroscopy. The results obtained show that the phenolic groups in the crystal 1 can successivelypenetrate into the adjacent β-cyclodextrin cavities from the secondary side to form head-to-taillinear polymeric su-pramolecule with a 2-fold screw axis. The self-assembly behavior also can bedetermined in D_2O solution, giving a self-association constant of 240 mol^(-1)·L. Using thepresent and previous structures reported for the relevant β-cyclodextrin derivatives, i.e.,mono(6-anilino-6-deoxy)-β-cyclodextrin, mono(6-phenylselenyl-6-deoxy)-β-cyclodextrin, andmono(6-phenylthio-6-deoxy)-β-cyclodextrin, we further reveal the factors governing the formationsof supramolecular assemblies.

关键词： crystal structure, cyclodextrin, pivot atoms, self-assembly, supramolecule.

Self-assembly behavior of inclusion complex formed by β-cyclodextrin withα-aminopyridine

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Science China Chemistry 2004年第3期47卷 200-205页

An inclusion complex (1) has been prepared by β-cyclodextrin with α-aminopyridine. The result of X-ray crystallographic analyses showed that the α-aminopyridine molecules in the β-cyclodextrin cavities possess two opposite orientations, i.e. the amine group of α-aminopyridine pointing to the primary side (1a, occupancy: 41.2%) or the secondary side (1b, occupancy: 58.8%) of β-cyclodextrin, forming two scalelike supramolecular aggregations. The studies of 2D NMR and circular dichroism spectra indicated that the α-aminopyridine molecule is deeply embedded in the β-cyclodextrin cavity to form host-guest inclusion complex, showing a circular dichroism spectrum induced by the chiral cavity of cyclodextrin. The results obtained are helpful for understanding the molecular recognition and aggregation mechanism between the host and guest.

关键词： aggregation, crystal structure, cyclodextrin, hydrogen bonds, inclusion complex.

Deducing cascading failures caused by cyberattacks based on attack gains and cost principle in cyber-physical power systems

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Journal of Modern Power Systems and Clean Energy 2019年第6期7卷 1450-1460页

作者： Yufei WANG yanli liu Jun’e LI Key Laboratory of Aerospace Information Security and Trusted Computing Ministry of EducationSchool of Cyber Science and EngineeringWuhan UniversityWuhan 430072China Global Energy Interconnection Research Institute Co.Ltd Beijing 102209China Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin 300072China

To warn the cascading failures caused by cyberattacks(CFCAs)in real time and reduce their damage on cyber-physical power systems(CPPSs),a novel early warning method based on attack gains and cost principle(AGCP)is ***,according to the CFCA characteristics,the leading role of attackers in the whole evolutionary process is *** breaking out of a CFCA is deduced based on the AGCP from the view of attackers,and the priority order of all CFCAs is then ***,the method to calculate the probability of CFCAs is proposed,and an early warning model for CFCA is ***,to verify the effectiveness of this method,a variety of CFCAs are simulated in a local CPPS model based on the IEEE 39-bus *** experimental results demonstrate that this method can be used as a reliable assistant analysis technology to facilitate early warning of CFCAs.

关键词： Cyber-physical power system Cascading failure Cyberattack Early warning Fault probability Attack gains and cost principle Attack route choice

Assessment of the Tessier and BCR sequential extraction procedures for elemental partitioning of Ca, Fe, Mn, Al,and Ti and their application to surface sediments from Chinese continental shelf

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Acta Oceanologica Sinica 2018年第5期37卷 22-28页

作者： liu yanli ZHANG Jing HE Huijun Laboratory of Marine Chemistry Theory and Technology of Ministry of Education Ocean University of China Earth and Environmental System Graduate School of Science and Engineering University of Toyama

Surface sediments can integrate a wide variety of information of seawater in marginal seas, e.g., the Quaternary sedimentary shelf such as the East China Sea（ECS） and Yellow Sea（YS）. The Tessier and BCR sequential extraction procedures（SEPs） have been widely applied for extraction of various geochemical phases from sediments. To choose a suitable SEP for phase extraction of sediments from the above Quaternary sedimentary shelf, efficiency and selectivity experiments were conducted on typical individual minerals and the applicability of each SEP was assessed for natural sediments（the natural sediment standard GSD-9 and three surface sediment samples）. The geochemical represented elements（Ca, Fe, Mn, Al, and Ti） were measured using both SEPs. Both SEPs have good dissolution efficiency and selectivity for the targeted geochemical phases; the optimized extractant volume for each fraction was determined. The Tessier SEP is particularly recommended for the study of adsorption-desorption process. The application of the Tessier SEP to surface sediments can furnish valuable information, including the productivity conditions（via the reducible fraction Mn） and sedimentary environments（via the carbonate fraction Ca）. These results confirm that the Tessier SEP is suitable for elemental fractionation in sediments from the Chinese continental shelf.

关键词： elemental fractionation surface sediments Tessier SEP BCR SEP efficiency selectivity

Towards an Internet-like Power Grid

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Journal of Modern Power Systems and Clean Energy 2022年第1期10卷 1-11页

作者： Iasonas Kouveliotis-Lysikatos Nikos Hatziargyriou yanli liu Felix Wu Department of Electrical Engineering and Computer Science KTH-Royal Institute of TechnologyTeknikringen 3310040StockholmSweden School of Electrical and Computer Engineering National Technical University of Athens15773 AthensGreece School of Electrical and Information Engineering Tianjin UniversityTianjin300072China Department of Electrical and Electronic Engineering The University of Hong KongHong KongChina Department of Electrical Engineering and Computer Sciences University of CaliforniaBerkeleyCA 94720USA

The great challenges faced by modern power systems require a fresh look at the conventional operation paradigm. The significant challenges faced by modern power systems require an innovative method for the conventional operation paradigm. We claim that the decarbonization of the power grid and extensive electrification of numerous sectors of human activity can only be fostered by a self-adaptable and smart power grid that manifests similar qualities to those of the Internet. The Internet is constructed on a layered architecture that facilitates technology innovations and its intelligence is distributed throughout a hierarchy of networks. In this paper, the fundamental differences between the network data flows and power flows are examined, and the basic requirements for an innovative operation paradigm are highlighted. The current power grid is operated in a highly inflexible, centralized manner to meet increased security goals. A new highly flexible, distributed architecture can be realized by distributing the operation responsibility in smaller areas or even in grid components that can make autonomous decisions. The characteristics of such a power grid are presented, and the key features and advances for the on-going transition to a sustainable power system are identified. Finally, a case study on distributed voltage control is presented and discussed.

关键词： Smart grid Internet distributed intelligence decentralized architecture

Age-associated changes in caecal microbiome and their apparent correlations with growth performances of layer pullets

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Animal Nutrition 2021年第3期7卷 841-848页

作者： yanli liu Tao Yan Zhouzheng Ren Xiaojun Yang College of Animal Science and Technology Northwest A&F UniversityYangling 712100China

The microbiome in gastrointestinal tracts play an important role in regulating nutrient utilization and absorption, gut immune function, and host growth or development. This study was conducted to investigate the composition and dynamic distribution of caecal microbiota in pullets during the first 16 weeks. Growth performance, immune organs index, and intestinal morphology of pullets were analyzed at 3, 6, 12 and 16 weeks of age. The caecal contents were collected for microbiota analysis by 16S rRNA gene sequencing method. With advancing ages in pullets, the gradually increased average daily feed intake (ADFI), feed conversion ratio (FCR) and intestinal villus height, but the gradually decreased organs index of thymus and bursa were determined. Meanwhile, more abundant caecal bacterial com-munities were determined from pullets at 12 and 16 weeks of age than those at 3 and 6 weeks of age. Furthermore, the dominant microflora of pullets from different weeks of age were analyzed by using LEfSe: The higher abundance of Blautia, Prevotella, Alistipes, and Eggerthella were found at 6 weeks;Anaerostipes, Oscillospira, Enterococcus and Methanobrevibacter were determined at 12 weeks;and the higher abundance of Parabacteroides, Anaerofustis, Lactobacillus and Butyricimonas were determined at 16 weeks. Further functional predicted analysis by PICRUSt revealed that the endocrine system and car-bohydrate metabolism were significantly developed at 3 weeks. The development of the immune system was predicted to be mainly during 6 to 12 weeks, while cardiovascular diseases and circulatory system were during 12 to 16 weeks. In addition, the significantly negative correlation between Bacteroides and villus height, the significantly negative correlation between growth parameters (ADFI and FCR) and Bacteroides, Oscillospira and Alistipes;and the significantly positive relations between growth parameters (ADFI and FCR) and Bilophila, Lactobacillus, Rikenella and Anaerofustis were determi

关键词： 16S rRNA Caecal microbiota Laying hen Developmental stage Intestinal health

Soil and Vegetation Spectral Coupling Difference (SVSCD) for Minerals Extraction from Hyperion Data in Vegetation Covered Area

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Chinese Geographical Science 2018年第6期28卷 957-972页

作者： CHEN Shengbo HUANG Shuang liu yanli ZHOU Chao College of Geoexploration Science and Technology Jilin University Changchun 130026 China National Marine Environmental Monitoring Center Dalian 116023 China

Remote sensing data have been widely applied to extract minerals in geologic exploration, however, in areas covered by vegetation, extracted mineral information has mostly been small targets bearing little information. In this paper, we present a new method for mineral extraction aimed at solving the difficulty of mineral identification in vegetation covered areas. The method selected six sets of spectral difference coupling between soil and plant(SVSCD). These sets have the same vegetation spectra reflectance and a maximum different reflectance of soil and mineral spectra from Hyperion image based on spectral reflectance characteristics of measured spectra. The central wavelengths of the six, selected band pairs were 2314 and 701 nm, 1699 and 721 nm, 1336 and 742 nm, 2203 and 681 nm, 2183 and 671 nm, and 2072 and 548 nm. Each data set's reflectance was used to calculate the difference value. After band difference calculation, vegetation information was suppressed and mineral abnormal information was enhanced compared to the scatter plot of original band. Six spectral difference couplings, after vegetation inhibition, were arranged in a new data set that requires two components that have the largest eigenvalue difference from principal component analysis(PCA). The spatial geometric structure features of PC1 and PC2 was used to identify altered minerals by spectral feature fitting(SFF). The collecting rocks from the 10 points that were selected in the concentration of mineral extraction were analyzed under a high-resolution microscope to identify metal minerals and nonmetallic minerals. Results indicated that the extracted minerals were well matched with the verified samples, especially with the sample 2, 4, 5 and 8. It demonstrated that the method can effectively detect altered minerals in vegetation covered area in Hyperion image.

关键词： spectral difference coupling vegetation covered area Hyperion image mineral extraction

Do Strigolactones Regulate Bud Winter Dormancy and Charactrisitc Secondary Metabolism in Tea?

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Phyton-International Journal of Experimental Botany 2021年第1期90卷 65-73页

作者： Lin Feng Ziming Gong Guofeng liu yanli liu Institute of Fruit and Tea Hubei Academy of Agricultural Science/Hubei Tea Engineering and Technology Research CentreWuhan430064China College of Life Sciences Xinyang Normal UniversityXinyang464000China

Tea(Camellia sinensis[L.]***.)is an important cash crop,which mainly uses tender shoots and young leaves for *** to the marketing characteristic that earlier made tea has higher price,the time of the breaking of winter dormancy buds in spring is extremely important in tea *** are a group of carotenoids-derived metabolites which regulates bud outgrowth,shoot branching,tiller angle and environmental stress *** role of strigolactones in tea plant was briefly summarized in the current review,with an emphasis of the association of strigolactones on bud ecodormancy and shoot *** involvement of strigolactones on the biosynthesis of the tea characteristic metabolites flavonoids,caffeine and theanine were also ***,recent advances on the biosynthesis of strigolactones and its regulation by microRNAs and environmental stresses were also *** review provides a basis for future investigations underlying the mechanisms of strigolactones on bud winter dormancy and tea secondary metabolism.

关键词： Camellia sinensis strigolactones winter dormancy secondary metabolites