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Influence of thermal ageing on high-field polarisation characteristics and conductivity behaviour of submarine polymeric cables insulation

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High Voltage 2023年第1期8卷 138-148页

作者： Xize Dai jian Hao Gian Carlo Montanari Zheng jian Ruijin liao Xinlong Zheng State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqingChina Department of Energy Aalborg UniversityAalborgDenmark Center for Advanced Power Systems Florida State UniversityTallahasseeFloridaUSA Shinan Power Supply Branch Company of State Grid Chongqing Electric Power Company NananChina Zhoushan Power Supply Branch Company of State Grid Zhejiang Electric Power Company ZhoushanChina

Diagnosing insulation intrinsic ageing is essential for preventing insulation failure of submarine cables,and in case of failure,helping in any decision about maintenance *** this study,a novel aged cable diagnosis approach based on high-voltage frequency domain spectroscopy(HV-FDS)with broader frequency width is proposed to analyse the high-field polarisation characteristics and conductivity behaviour of 500 kV submarine polymeric cables insulation,aiming to support the evaluation of overall insulation *** measurement principle of HV-FDS and relaxation mechanism are stated,and then focus is on studying the extent of change of polarisation and conduction properties of submarine cables insulation as a function of ageing stress and ***,the high-field polarisation characteristics and conductivity behaviour are discussed in-depth based on the carrier transport and trap ***,the novel diagnostic indicator based on the high-field characteristics is extracted to quantify the thermal ageing state of submarine cables *** show that the high-field polarisation characteristics and conductivity behaviour seem to become sensitive diagnostic quantities if measured at reasonably high voltage,which are able to reveal mechanisms associated with thermo-oxidative ageing as that generated in the testing procedure considered in this *** is considerably higher than that experienced in typical dielectric spectroscopy approaches.

关键词： behaviour insulation characteristics

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A Cluster Algorithm for the 2-D SU(3)×SU(3) Chiral Model

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Chinese Physics Letters 1996年第7期13卷 549-552页

作者： JI Da-ren ZHANG jian-bo Zhejiang Institute of Modern Physics Zhejiang UniversityHangzhou 310027

To extend the cluster algorithm to SU(N)×SU(N)chiral models,a variant version of Wolff's cluster algorithm is proposed and tested for the 2-dimensional SU(3)×SU(3)chiral *** results show that the new method can redu... 详细信息

关键词： SU(3) model chiral

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Contribution of Root Proliferation in Nutrient-Rich Soil Patches to Nutrient Uptake and Growth of Maize

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Pedosphere 2012年第6期22卷 776-784页

作者： LI Hong-bo ZHANG Fu-Suo SHEN jian-bo Department of Plant Nutrition China Agricultural UniversityKey Laboratory of Plant-Soil InteractionsMinistry of EducationBeijing 100193(China)

Root proliferation can be stimulated in a heterogeneous nutrient patch; however, the functions of the root proliferation in the nutrient-rich soil patches are not fully understood. In the present study, a two-year field experiment was conducted to examine the comparative effects of localized application of ammonium and phosphorus (P) at early or late stages on root growth, nutrient uptake, and biomass of maize (Zea mays L.) on a calcareous soil in an intensive farming system. Localized supply of ammonium and P had a more evident effect on shoot and root growth, and especially stimulated fine root development at the early seedling stage, with most of the maize roots being allocated to the nutrient-rich patch in the topsoil. Although localized ammonium and P supply at the late stage also enhanced the fine root growth, the plant roots in the patch accounted for a low proportion of the whole maize roots in the topsoil at the flowering stage. Compared with the early stage, fine root length in the short-lived nutrient patch decreased by 44%-62% and the shoot dry weight was not different between heterogeneous and homogeneous nutrient supply at the late growth stage. Localized supply of ammonium and P significantly increased N and P accumulation by maize at 35 and 47 days after sowing (DAS); however, no significant difference was found among the treatments at 82 DAS and the later growth stages. The increased nutrient uptake and plant growth was related to the higher proportion of root length in the localized nutrient-enriched patch. The results indicated that root proliferation in nutrient patches contributed more to maize growth and nutrient uptake at the early than late stages.

关键词： biomass growth stage intensive farming system localized nutrient supply root length

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Transverse relaxation characteristic and stress relaxation model considering molecular chains of HTPB coating based on pre-strained thermal aging

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Defence Technology（防务技术） 2021年第3期17卷 821-828页

作者： Yong-qiang Du jian Zheng Gui-bo Yu jian-zhuang Zhi Shijiazhuang Campus Army Engineering UniversityShijiazhuang050003China Intelligent Manufacturing Institute Hebei College of Industry and TechnologyShijiazhuang050003China

In order to accurately describe the transverse relaxation characteristic and stress relaxation modulus of HTPB coating during pre-strain thermal aging process,a one month thermal aging test was carried out at70C with pre-strain of 0%,3%,6%and 9%,*** low-field1 H NMR and stress relaxation modulus tests were carried out for HTPB coating at different aging *** stress relaxation model considering the molecular chains was proposed according to the changes of crosslinking chain and dangling chain of HTPB coating during pre-strain *** results showed that with the increase of aging time,the decay rate of transverse relaxation curve became faster,the transverse relaxation time decreased,the value of combined parameter q Mrl increased,the proportion of crosslinking chain decreased,while the proportion of dangling chain ***,the stress relaxation modulus increased,the crosslinking network structure of HTPB coating became denser and the degree of crosslinking *** the initial aging stage,the pre-strain will destroy the crosslinking network structure of HTPB coating to a certain *** the increase of aging time,the effect of pre-strain will gradually weaken and the influence of aging on materials will gradually *** correlations between the stress relaxation model considering the molecular chains and the test results were more than 0.9950,which can accurately describe the stress relaxation modulus of HTPB coating during the pre-strain thermal aging process.

关键词： HTPB Pre-strain aging Transverse relaxation characteristic Molecular chain Stress relaxation model

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Axon guidance factor netrin-1 and its receptors regulate angiogenesis after cerebral ischemia

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Neuroscience Bulletin 2014年第4期30卷 683-691页

作者： Qiao Ding Song-Jie liao jian Yu Department of Neurology Guangdong Key Laboratory for Diagnosis and Treatment of Major Neurological DiseasesNational Key Clinical DepartmentNational Key Disciplinethe First Affiliated Hospital of Sun Yat-Sen University

Neurogenesis and angiogenesis play important roles in functional recovery after ischemic stroke. When cerebral ischemia occurs, axon regeneration can compensate for the loss of apoptotic neurons in the ischemic area. The formation of new blood vessels ameliorates the local decrease in blood supply, enhancing the supply of oxygen and nutrients to newly-formed neurons. New blood vessels also act as a scaffold for the migration of neuroblasts to the infarct area after ischemic stroke. In light of this, researchers have been actively searching for methods to treat cerebral infarction. Netrins were first identified as a family of proteins that mediate axon guidance and direct axon migration during embryogenesis. Later studies have revealed other functions of this protein family. In this review, we focus on netrin-1, which has been shown to be involved in axon migration and angiogenesis, which are required for recovery after cerebral ischemia. Thus, therapies targeting netrin-1 may be useful for the treatment of ischemic stroke.

关键词： netrin-1 angiogenesis cerebral ischemia neuronal recovery

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Bibliometric study of sepsis-associated liver injury from 2000 to 2023

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World Journal of Gastroenterology 2024年第30期30卷 3609-3624页

作者： Zheng Zhang Xiao-Jiao Tan Hai-Qing Shi Huan Zhang jian-bo Li Xue-Lian liao Department of Critical Care Medicine West China HospitalSichuan UniversityChengdu 610041Sichuan ProvinceChina Department of Critical Care Medicine West China Tianfu Hospital of Sichuan UniversityChengdu 610200Sichuan ProvinceChina

BACKGROUND Sepsis-associated liver injury(SLI)is a severe and prevalent complication of *** To explore the literature on SLI via a bibliometric *** Reviews and articles correlated with SLI published from January 1,2000 to October 28,2023 were searched from the Web of Science Core ***,the searched data were analyzed using VOSviewer,CiteSpace,and R *** There were 787 publications involved in this paper,comprising 745 articles and 42 ***,the United States,and Germany are the primary publication sources in this *** related to SLI primarily focused on mechanisms of pathogenesis,as evidenced by analyzing keywords,references,and the counting of original *** studies mainly involved tumor necrosis factor alpha,inflammation,oxidative stress,and nuclear factor-kappa *** There is significant growth in the research on *** investigations primarily involve basic experiments that aimed at uncovering pathogenic *** to the analyzed literature,the identified pathogenic mechanisms and potential therapeutic targets serve as the foundation for translating findings from basic research to clinical applications.

关键词： Sepsis Liver injury Bibliometric analysis Cite space VOS viewer

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Discrete micropayment protocol based on master-slave payword chain

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The Journal of China Universities of Posts and Telecommunications 2007年第1期14卷 58-60,84页

作者： FAN Li-min liao jian-xin State Key Laboratory of Net Studying and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China

Using the idea of Payword, the new concept of master-slave payword chain （MSPC） is proposed in this article. MSPC consists of one master payword chain and one slave payword chain. On the basis of MSPC, a new micropayment protocol called discrete micropayment protocol （DMP）, is presented in this article. DMP consists of three sub-protocols： registration, payment, and settlement. both part fairness and non-unit-wise payment can be provided by DMP.

关键词： payword micropayment fairness unit-wise payment

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A Method for Obtaining Integrable Couplings

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Communications in Theoretical Physics 2006年第6期45卷 1000-1002页

作者： ZHANG Yu-Sen CHEN Wei liao bo GONG Xin-bo Department of Mathematics Shandong University at Weihai Weihai 264209 China School of Computer and Communication Hunan University Changsha 410082 China Information School Shandong University of Science and Technology Qingdao 266510 China

By making use of the vector product in R^3, a commuting operation is introduced so that R^3 becomes a Lie algebra. The resulting loop algebra R^-3 is presented, from which the well-known AKNS hierarchy is produced. Again via applying the superposition of the commuting operations of the Lie algebra, a commuting operation in R^6 is constructed so that R^6 becomes a Lie algebra. Thanks to the corresponding loop algebra R^3 of the Lie algebra R^3, the integrable coupling of the AKNS system is obtained. The method presented in this paper is rather simple and can be used to work out integrable coupling systems of the other known integrable hierarchies of soliton equations.

关键词： AKNS hierarchy integrable couplings Lie algebra

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A Polynomial Prediction Filter Method for Estimating Multisensor Dynamically Varying Biases

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Chinese Journal of Aeronautics 2007年第3期20卷 240-246页

作者： GAO Yu ZHANG jian-qiu HU bo Department of Electronics Fudan University Shanghai 200433 China

The estimation of the sensor measurement biases in a multisensor system is vital for the sensor data fusion. A solution is provided for the estimation of dynamically varying multiple sensor biases without any knowledge of the dynamic bias model parameters. It is shown that the sensor bias pseudomeasurement can be dynamically obtained via a parity vector. This is accomplished by multiplying the sensor uncalibrated measurement equations by a projection matrix so that the measured variable is eliminated from the equations. Once the state equations of the dynamically varying sensor biases are modeled by a polynomial prediction filter, the dynamically varying multisensor biases can be obtained by Kalman filter. Simulation results validate that the proposed method can estimate the constant biases and dynamic biases of multisensors and outperforms the methods reported in literature.

关键词： signal processing dynamic bias estimation simulation multisensor Kalman filter

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Highly Sensitive Spectrofluorimetric Determination of Trace Amounts of Indium(Ⅲ) with Salicylaldehyde Salicyloylhydrazone

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Chemical Research in Chinese Universities 2002年第2期18卷 183-188页

作者： HAN Fang WANG Hong jian TANG bo Department of Chemistry Shandong Normal UniversityJinan 250014P.R.China

The fluorescent reaction of salicylaldehyde salicyloylhydrazone(SASH) with indium(Ⅲ) was studied in detail. Based on this chelation reaction, a sensitive spectrofluorimetric method was developed for the determination of indium in a water ethanol(volume ratio 3∶7) medium at pH 4 0. Under the condition, the In SASH complex displays an excitation and emission maxima at 396 and 461 nm, respectively. The linear range of the method is from 4 7 to 1000 ng/mL and the detection limit is 0 94 ng/mL. The molar ratio of indium to the reagent is 1∶1. The interferences of other ions were studied. The method was successfully applied to the determination of indium in the chemical reagents of lead, tin, zinc, zinc chloride and geological samples by standard addition method.

关键词： Indium determination Salicylaldehyde salicyloylhydrazone Spectrofluorimetry

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