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Overvoltage Suppression for UHV Transmission Lines

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Transactions of Tianjin University 2008年第3期14卷 222-225页

作者：李永丽刘太华李仲青景雷龙英范建忠 Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University ABB (China) Research Ltd.

The overvoltage phenomena of ultra high voltage (UHV) transmission lines are analyzed and verified by EMTDC/PSCAD simulation. Referring to the theoretical analyses and operating experiences of extra high voltage (EHV) transmission lines in China and UHV transmission lines in Russia and Japan, the methods to suppress the internal overvoltage in UHV transmission lines by protection and control strategies are discussed. Through the cooperation among the recloser, shunt reactor, tripping and closing resistance, and metal oxide varistor(MOV), the overvoltage can be restrained within an acceptable level.

关键词： overvoltage reclosing relay protection shunt reactors suppression UHV transmission lines

Thorium anomaly on the lunar surface and its indicative meaning

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Acta Geochimica 2024年第3期43卷 507-519页

作者： Jingyi Zhang jianzhong Liu Center for Lunar and Planetary Science Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China University of Chinese Academy of Sciences Beijing 100049China

The Moon has been divided into three terranes:Procellarum KREEP Terrane(PKT),Feldspathic Highland Terrane(FHT),and South Pole-Aitken Terrane(SPAT),using globally measured Th and *** lunar evolu-tion models have predicted that a lunar magma ocean will produce a residual layer enriched in incompatible elements such as K,REE,and P(i.e.,KREEP)in the late age of crys-tallization;and that the distribution of thorium can be used as a proxy for determining the global distribution of *** thorium distribution in these three terranes is *** highest concentration of thorium is in PKT,the medium concentration of thorium is in SPAT,and almost none in *** what is the specific distribution in each of the terrane and what enlightenment can it tell us?Here we present and describe the detailed thorium distribution in PKT,SPAT,and FHT and provide some information for the origin of asymmetries on the lunar surface.

关键词： Procellarum KREEP Terrane(PKT) Feldspathic Highland Terrane(FHT) South Pole-Aitken Terrane(SPAT) KREEP Thorium abundance

Effective suppression of fibronectin synthesis by retrovirus delivered shRNA in rat cardiac fibroblasts

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Science China(Life Sciences) 2004年第4期47卷 368-375页

作者： WU Di1. HONG Quan1. CHEN Xiangmei1. FU Bo1. LI Aipingi2, LIU Hang1. BAI Xueyuan1.& WANG jianzhong1.1. Department of Nephrology, General Hospital of PLA, Beijing 1.0853, China 2. Department of Cardiology, General Hospital of PLA, Beijing 1.0853, China Department of Nephrology General Hospital of PLABeijing 100853China Department of Cardiology General Hospital of PLABeijing 100853China

Extracellular matrix overexpression is a common final pathway that leads to ventricular remodeling. Fibronectin plays a pivotal role in this progress. In the work presented here, we explored the possibility of direct inhibition of fibronectin synthesis in rat cardiac fibroblasts by small interference RNA (siRNA). We found that siRNA could successfully suppress the fibronectin overexpression stimulated by angiotensin II. To overcome the limitations of plasmid-based siRNA, we subcloned the H1.promoter into pLXIN, a commercially available retroviral vector. We found that H1.promoter worked very well to form the small hairpin RNA (shRNA) on the retroviral vector, and the fibronectin expression was dramatically down regulated by shRNA. We think the retroviral shRNA delivery system that we have constructed may have potential roles in treating ventricular remodeling. Keywords RNA interference (RNAi) - Angtiotensin II (ATII) - extracellular matrix - fibronectin

关键词： RNA interference (RNAi) Angtiotensin II (ATII) extracellular matrix fibronectin

2-local unstable homotopy groups of indecomposable A3～2-complexes

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Science China Mathematics 2024年第3期67卷 607-626页

作者： Zhongjian Zhu jianzhong Pan College of Mathematics and Physics Wenzhou University Hua Loo-Keng Key Laboratory of Mathematics Institute of MathematicsAcademy of Mathematics and Systems ScienceChinese Academy of Sciences School of Mathematical Sciences University of Chinese Academy of Sciences

In this paper,we calculate the 2-local unstable homotopy groups of indecomposable A3～*** main technique used is analysing the homotopy property of J（A,X）,defined by Gray（1.73） for a CW-pair（X,A）,which is homoto... 详细信息

关键词： homotopy groups A 2 n -complexes fibration sequence relative James construction 55P1.

Swimming velocity of spherical squirmers in a square tube at finite fluid inertia

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Applied Mathematics and Mechanics(English Edition) 2024年第9期45卷 1481-1498页

作者： Tongxiao JIANG Deming NIE jianzhong LIN Institute of Fluid Mechanics China Jiliang UniversityHangzhou 310008China Key Laboratory of Impact and Safety Engineering(Ningbo University) Ministry of EducationNingbo 315211China Institute of Fluid Engineering Zhejiang UniversityHangzhou 310027China

The three-dimensional lattice Boltzmann method(LBM)is used to simulate the motion of a spherical squirmer in a square tube,and the steady motion velocity of a squirmer with different Reynolds numbers(Re,ranging from 0.1.to 2)and swimming types is investigated and analyzed to better understand the swimming characteristics of microorganisms in different ***,as the Reynolds number increases,the effect of the inertial forces becomes significant,disrupting the squirmer's ability to maintain its theoretical ***,as the Reynolds number increases,the structure of the flow field around the squirmer changes,affecting its velocity of ***,the swimming velocity of the squirmer exhibits a quadratic relationship with the type of swimming and the Reynolds ***,the narrow tube exerts a significant inhibitory effect on the squirmer *** addition,although chirality does not directly affect the swimming velocity of the squirmer,it can indirectly affect the velocity by changing its motion mode.

关键词： spherical squirmer swimming characteristics swimming velocity fow structure

Control of highly pathogenic avian influenza through vaccination

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Journal of Integrative Agriculture 2024年第5期23卷 1447-1453页

作者： Xianying Zeng jianzhong Shi Hualan Chen State Key Laboratory for Animal Disease Control and Prevention Harbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin150069China

The stamping-out strategy has been used to control highly pathogenic avian influenza viruses in many countries,driven by the belief that vaccination would not be successful against such viruses and fears that avian influenza virus in vaccinated birds would evolve more rapidly and pose a greater risk to *** this review,we summarize the successes in controlling highly pathogenic avian influenza in China and make suggestions regarding the requirements for vaccine selection and *** addition,we present evidence that vaccination of poultry not only eliminates human infection with avian influenza virus,but also significantly reduces and abolishes some harmful characteristics of avian influenza virus.

关键词： avian influenza control highly pathogenic vaccination

Chirality transfer induced circularly polarized luminescence of achiral dye molecules by plasmonic nanohelicoid

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Nano Research 2024年第9期17卷 8408-8414页

作者： Han Gao ChunLian Zhan Tianqi Zhao jianzhong Zheng College of Optical and Electronic Technology China Jiliang UniversityHangzhou 310018China School of Environmental Science and Engineering Nanjing Tech UniversityNanjing 211816China

Optical materials with circularly polarized luminescence(CPL)features have attracted a growing interest due to their crucial role in biological sensing,display,spintronics,information storage,and so ***,CPL emissions in hybrid nanoparticle systems,in particular,chirality transfer induced CPL from chiral plasmonic nanoparticles,have rarely been explored due to a lack of effective bottom-up synthesis ***,we creatively take advantage of the newly introduced chiral plasmonic nanoparticles-gold nanohelicoid(GNH)to excite the CPL of achiral Rhodamine 6G(R6G).The fabricated GNH@R6G-SiO_(2)shows obvious CPL signals with|g_(lum)|up to *** with the single GNH,the photoluminescence(PL)dissymmetry factor of the single GNH@R6G-SiO_(2)is similar,but with 25 folds higher PL intensities under different circular *** research not only offers an effective and feasible method to fabricate single-particle level CPL-active materials,but also provides guidelines on how to regulate the CPL of achiral luminophores from chiral plasmonic nanostructures,thereby enlarging the category and quantity of CPL-active materials that can be applied for photonic technologies and visualization biosensing,especially some intracellular chirality related detection.

关键词： circularly polarized luminescence gold nanohelicoids chiral plasmonic

Merging SoC and LOC Together

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Merging SoC and LOC Together

A novel adaptive coordinated tracking control scheme for a morphing aircraft with telescopic wings

2008 9th International Conference on Solid-State and Integrated-Circuit Technology

作者： Zhihong Li1. Xu Ji 1. Lu Wang 2, jianzhong Xi 2 (1. National Key Laboratory of Nano/Micro Fabrication Technology, Institute of Microelectronics, Peking University, Beijing, 1.0871. China 2 Biomedical Engineering Center, College of Engineering, Peking University, Beijing, 1.0871. CHINA)

A promising combination of the semiconductor integrated System-on-a-Chip （SoC） with the Lab-on-a-Chip （LOC） is brought in this paper. In this paper, we propose a new technology which enables monolithic integration of the self-assembled biological system, the MEMS structure, the microfluidic system, and CMOS electronic circuits together. Utilizing this approach, more functionality is introduced into the SoC, while the LOC becomes more intelligent and controllable. A Post-CMOS fabrication approach that meets the requirements is demonstrated to validate the idea.

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Chinese Journal of Aeronautics 2024年第2期37卷 148-162页

作者： Enmei WANG Hao LU Jianchun ZHANG Chenliang WANG jianzhong QIAO Hangzhou Innovation Institute Beihang UniversityHangzhou 310051China School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China

Inspired by flight biology,morphing flight technology has great potential to improve the adaptability and maneuverability of *** paper is devoted to the flight control problem of morphing aircraft,and aimed at safe and fuel-saving flight through morphing ***,the longitudinal dynamics of a morphing aircraft with telescopic wings is modelled as a strict-feedback nonlinear *** fitting the expression of aerodynamic parameters by the mor-phing ratio,the model uncertainties induced by morphing errors are embedded in the *** meet the safety and fuel-saving requirements,an Adaptive Coordinated Tracking Control Scheme(ACTCS)is then proposed,which consists of a morphing control module and a tracking control *** the morphing control module,an on-line morphing decision model is given in an optimization process with respect to the morphing ratio,and a second-order tracking filter is introduced to smooth the decision output and ensure the physical *** the tracking control module,the novel adaptive controllers for the velocity and altitude subsystems are proposed based on the dynamic surface control method,in which adaptive mechanisms are designed to com-pensate for the model ***,the proposed ACTCS is simulated in nine different cases of the test flight mission,to verify its effectiveness,robustness and fuel-saving effect.

关键词： Morphing aircraft Adaptive tracking control Morphing decision Dynamic surface control Morphing error