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Investigation on short-term burst pressure of plastic pipes reinforced by cross helically wound steel wires

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第5期9卷 640-647页

作者： Jin-yang ZHENG yong-jian GAO Xiang LI Xiu-feng LIN Yu-bin LU Yan-cong zhu Institute of Chemical Machinery and Process Equipment Zhejiang University Hangzhou 310027 China

Plastic pipes reinforced by cross helically wound steel wires (PSP), which have exhibited excellent mechanical performance, consist of inner polyethylene (PE) layer, winding layer and outer PE layer. The winding layer is composed of two monolayers where steel wires are cross helically wound. An analytical procedure is developed to predict the short-term burst pressure of PSP as the monolayer is assumed to be elastic and orthotropic. The 3D anisotropic elasticity and Maximum Stress Failure Criterion are employed in the formulation of the elasticity problem. Good agreement between the theoretical results and the experimental data shows that the proposed approach can well predict the short-term burst pressure of PSP.

关键词： Composite pipes Maximum Stress Criterion Short-term burst pressure

ANALYSIS OF LEAKAGE CHARACTERISTICS OF LABYRINTH SEALS

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Chinese Journal of Aeronautics 1990年第4期5卷 233-238页

作者： zhu, Yizhang He, feng Beijing Inst of Chemical Technology Beijing China

This paper presents the leakage characteristics of labyrinth seals, which were introduced by theoretical analysis and experiment results. The study of the dissipative process converting the kinetic energy to the thermal energy within the labyrinth chamber is emphasized. Experiments were carried out using a model of Straight-Through Labyrinth. By changing the Reynolds number, pressure ratio, and the ratios of clearance and depth to the length of the chambers, the flow coefficient, carry-over factor and ideal labyrinth function can be determined. Additionally, by applying the continuity equation, energy equation. Bernoulli's equation and the equation of state to the vortex chambers, a closed set of equations is obtained. Solving the equations simultaneously and numerically, the velocity, pressure and temperature in each vortex- chamber can be determined completely. Finally, the leakage of the labyrinth is acquired.

关键词： Fluid Mechanics

Partial Collapsing Degeneration of Floer Trajectories and Adiabatic Gluing

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Acta Mathematica Sinica,English Series 2024年第1期40卷 161-249页

作者： yong-Geun OH Ke zhu Center for Geometry and Physics Institute for Basic Science(IBS)79 Jigok-ro 127beon-gilNam-guPohang-siGyeongsangbuk-doKorea 37673&POSTECHGyeongsangbuk doKorea Department of Mathematics and Statistics Minnesota State UniversityMankatoMN 56001USA

In the present paper,we study partial collapsing degeneration of Hamiltonian-perturbed Floer trajectories for an adiabatic ε-family and its reversal adiabatic gluing,as the prototype of the partial collapsing degeneration of 2-dimensional(perturbed)J-holomorphic maps to 1-dimensional gradient *** consider the case when the Floer equations are S^(1)-invariant on parts of their domains whose adiabatic limit has positive length as ε→0,which we call thimble-flow-thimble *** main gluing theorem we prove also applies to the case with Lagrangian boundaries such as in the problem of recovering holomorphic disks out of pearly *** particular,our gluing theorem gives rise to a new direct proof of the chain isomorphism property between the Morse-Bott version of Lagrangian intersection Floer complex of L by Fukaya-Oh-Ohta-Ono and the pearly complex of L Lalonde and *** also provides another proof of the present authors’earlier proof of the isomorphism property of the PSS map without involving the target rescaling and the scale-dependent gluing.

关键词： Floer trajectory equation partial collapsing degeneration thimble-flow-thimble moduli space adiabatic gluing exponential decay estimates three-interval method

First-passage failure of harmonically and stochastically excited Duffing oscillator with delayed feedback control

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Science China(Technological Sciences) 2011年第5期54卷 1072-1077页

作者： feng ChangShui zhu WeiQiu Institute of Mechatronic Engineering Hangzhou Dianzi University Hangzhou 310018 China Department of Mechanics State Key Laboratory of Fluid Transmission and Control Zhejiang University Hangzhou 310027 China

The first-passage failure of Duffing oscillator with the delayed feedback control under the combined harmonic and white-noise excitations is investigated. First, the time-delayed feedback control force is expressed approximately in terms of the system state variables without time delay. Then, the averaged It? stochastic differential equations for the system are derived by using the stochastic averaging method. A backward Kolmogorov equation governing the conditional reliability function and a set of generalized Pontryagin equations governing the conditional moments of the first-passage time are established. Finally, the conditional reliability function, the conditional probability density and moments of the first-passage time are obtained by solving the backward Kolmogorov equation and generalized Pontryagin equations with suitable initial and boundary conditions. The effects of time delay in feedback control force on the conditional reliability function, conditional probability density and moments of the first-passage time are analyzed. The validity of the proposed method is confirmed by digital simulation.

关键词： first-passage failure combined harmonic and white noise excitations delayed feedback control stochastic averaging

Molecular diversity analysis of Tetradium ruticarpum(Wu zhu Yu) in China based on inter-primer binding site(iPBS) markers and inter-simple sequence repeat(ISSR) markers

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Chinese Journal of Natural Medicines 2018年第1期16卷 1-9页

作者： XU Jing-Yuan zhu Yan YI Ze WU Gang XIE Guo-yong QIN Min-Jian Department of Resources Science of Traditional Chinese Medicines State Key Laboratory of Natural Medicines China Pharmaceutical University

"Wu zhu yu", which is obtained from the dried unripe fruits of Tetradium ruticarpum(A. Jussieu) T. G. Hartley, has been used as a traditional Chinese medicine for treatment of headaches, abdominal colic, and hypertension for thousands of years. The present study was designed to assess the molecular genetic diversity among 25 collected accessions of T. ruticarpum(Wu zhu yu in Chinese) from different areas of China, based on inter-primer binding site(i PBS) markers and inter-simple sequence repeat(ISSR) markers. Thirteen ISSR primers generated 151 amplification bands, of which 130 were polymorphic. Out of 165 bands that were amplified using 10 iPBS primers, 152 were polymorphic. The iPBS markers displayed a higher proportion of polymorphic loci(PPL = 92.5%) than the ISSR markers(PPL = 84.9%). The results showed that T. ruticarpum possessed high loci polymorphism and genetic differentiation occurred in this plant. The combined data of iPBS and ISSR markers scored on 25 accessions produced five clusters that approximately matched the geographic distribution of the species. The results indicated that both iPBS and ISSR markers were reliable and effective tools for analyzing the genetic diversity in T. ruticarpum.

关键词： Genetic diversity Tetradium ruticarpum iPBS Retrotransposon ISSR

Uniformly strong convergence of Kahler-Ricci flows on a Fano manifold

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Science China Mathematics 2022年第11期65卷 2337-2370页

作者： feng Wang Xiaohua zhu School of Mathematical Sciences Zhejiang UniversityHangzhou 310027China School of Mathematical Sciences Peking UniversityBeijing 100871China

In this paper,we study the uniformly strong convergence of the Kahler-Ricci flow on a Fano manifold with varied initial metrics and smoothly deformed complex *** an application,we prove the uniqueness of Kahler-Ricci solitons in the sense of diffeomorphism *** result generalizes Tian-zhu’s theorem for the uniqueness of of Kahler-Ricci solitons on a compact complex manifold,and it is also a generalization of Chen-Sun’s result of the uniqueness of Kahler-Einstein metric orbits.

关键词： Kahler-Ricci flow K¨ahler-Ricci solitons Q-Fano variety Gromov-Hausdorff topology

Construction of white spot syndrome virus (WSSV) whole genome phage display library

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Acta Oceanologica Sinica 2007年第2期26卷 75-83页

作者： zhu Yanbing YANG feng School of Biotechnology Jimei University Xiamen 361005 China Third Institute of Oceanography State Oceanic Administration Xiamen 361005 China

A rebuilt vector pCANTAB 5 EE was obtained by inserting a 34 bp double-stranded oligonucleotide which contained a EcoRV recognition sequence into pCANTAB 5 E. White spot syndrome virus （WSSV） genome DNA was fragmented by sonication to isolate fragments mainly in the range of 0.8 ～2.0 kb, then the fragments were blunt-ended with T4 DNA polymerase and cloned into the EcoRV site of pCANTAB 5 EE. The primary recombinant clone of the library was 3.0 × 10^*** PCR of random selected recombinants showed that the size of the inserts was 0.12 ～ 1.77 kb. After the whole library recombinant phages infected Escherichia coli HB2151 cells, the extracellular and periplasmic extracts were dropped on PVDF membranes to perform dot blot, using polyclonal mouse anti-VP24 serum,anti-WSV026 serum,anti-WSV063 serum,anti-WSV069 serum,anti-WSV112 serum, anti WSV238 serum,anti-WSV303 serum and anti-VP26 serum as the primary antibody, respectively. The results showed that the display library could express the viral proteins.

关键词： white spot syndrome virus genome phage display library dot blot

Significant photocatalytic enhancement in methylene blue degradation of Bi2WO6 photocatalysts via graphene hybridization

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Journal of Advanced Ceramics 2012年第1期1卷 72-78页

作者： feng ZHOU yongfa zhu Department of Materials Science and Engineering Dalian Maritime UniversityDalian 116026China Department of Chemistry Tsinghua UniversityBeijing 100084China

The hybridization of graphene with Bi_(2)WO_(6)photocatalysts was employed to enhance the photocatalytic *** photocatalytic activity enhancements were dependent on the amount of graphene and it was found that the optimal hybridized amount of graphene was about 1.5 wt%,which was close to the monolayer dispersing of graphene on Bi_(2)WO_(6)*** to four times of the photocatalytic activity was enhanced by the hybridization of graphene,compared with that of pristine Bi_(2)WO_(6).The enhancement mechanism of the photocatalytic activity was attributed to the higher separation efficiency and the inhibition of recombination of photoinduced electron-hole *** electronic interaction was verified by the photoelectrochemical measurements.

关键词： powders-chemical preparation carbon nanocomposites photocatalyst

Recent progress on photoactive nonprecious transition-metal complexes

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Science China Chemistry 2025年第1期 46-95页

作者： Zhong-Liang Gong Hong-Jie Zhang Yan Cheng Jianxun Liu Yuhan Ai Yaqin Li Zhihui feng Qiong Zhang Shaolong Gong yong Chen Chang-Jiang Yao Yuan-Yuan zhu Liang-Jin Xu Yu-Wu Zhong CAS Key Laboratory of Photochemistry Institute of Chemistry Chinese Academy of Sciences State Key Laboratory of Structural Cemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences School of Chemistry and Chemical Engineering Anhui Key Laboratory of Advanced Catalytic Materials and Reaction EngineeringHefei University of Technology State Key Laboratory of Explosion Science and Safety Protection School of Mechatronical Engineering Beijing Institute of Technology College of Chemistry and Molecular Sciences Hubei Key Lab on Organic and Polymeric Optoelectronic Materials Wuhan University School of Chemistry and Chemical Engineering Anhui University Key Laboratory of Photochemical Conversion and Optoelectronic Materials & CAS-HKU Joint Laboratory on New Materials Technical Institute of Physics and Chemistry Chinese Academy of Sciences

Photoactive complexes of nonprecious transition metals, mainly including those in the first-row and partially the second-row of the Periodic table of elements, have received increasing attention in view of their low cost and long-term sustainability. They are recognized as promising alternatives to noble transition metal complex congeners that have been extensively studied in optoelectronic devices, artificial photosynthesis, photocatalysis, biodiagnostics, and therapeutics, etc. This review is devoted to a comprehensive summary on the classical and recent advances on photoactive nonprecious transition metal complexes, including photoactive Zr, V, Cr, Mo, and W complexes, Mn complexes and hybrids, Fe, Co, Ni, and Cu complexes, and Zn and Cd complexes and hybrids. A particular focus is given on the molecular design, modulation of photophysical and photochemical properties, and applications of the representative and lately-developed nonprecious metal complexes. In addition, a perspective on the future development in this field is provided at the end of this review.

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