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Chinese Physics Letters 2013年第1期30卷 1-4页

作者： jiang zhi-Min WANG Wei-Min Institute of Quantum Electronics School of Electronic Engineering and Computer SciencePeking UniversityBeijing 100871

Two-dimensional(2D)nuclear magnetic resonance(NMR)distributions as functions of diffusion coefficient and relaxation time are powerful tools in the study of porous *** propose a practical method to perform proper truncation of singular value decomposition(TSVD)in Laplace inversion for obtaining 2D-NMR distributions from measured NMR *** analyzing basic algorithms for Laplace inversion,it is well known that proper TSVD does not affect the inversion result for an ill-posed problem with zero-order Tikhonov regularization,but can greatly increase the inversion *** this new method,the optimal number of singular values for data compression is applied to each dimension *** method also makes full use of the redundancy nature of the data with a finite signal-to-noise ratio and well balances the tradeoff between the speed and the *** method does not require the stochastic information of the estimated parameters when obtaining the optimal number of singular values.

关键词： NMR singular relaxation

Arthroscopic Reconstruction of the Posterior Cruciate Ligament with a Ligament-advanced Reinforcement System and Hamstring Tendon Autograft:A Retrospective Study

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Current Medical Science 2021年第5期41卷 930-935页

作者： Yang LUO zhi-gang WANG zhi-jiang LI Min WEI Department of Orthopedics the First Medical CentreChinese PLA General HospitalBeijing 100853China

Objective:Both ligament-advanced reinforcement system(LARS)and hamstring tendon autograft can serve as grafts for posterior cruciate ligament(PCL)***,few studies have compared the effectiveness of these two *** study therefore aimed to compare the clinical efficacy of arthroscopic reconstruction of the PCL using either the LARS or hamstring tendon ***:A total of 36 patients who underwent PCL reconstruction were retrospectively *** this cohort,15 patients received a reconstruction using the LARS(LARS group)and 21 using the hamstring tendon autograft(HT group).Results:The pre-and post-operative subjective scores and knee stability were evaluated and the patients were followed up for a period of 2 to 10.5 years(4.11±2.0 years on average).The last follow-up showed that functional scores and knee stability were significantly improved in both groups(P0.05).In the LARS and HT groups,12 and 9 patients,respectively exhibited KT1000 values<3 mm,with the difference being statistically significant(P<0.05).In the HT group,the diameter of the four-strand hamstring tendon was positively correlated with height(P<0.05),which was 7.37±0.52 mm in males and 6.50±0.77 mm in females(P<0.05).Conclusion:Both LARS and hamstring tendon approaches achieved good efficacy for PCL reconstruction,but patients in the LARS group exhibited faster functional recovery and better knee stability in the long *** is especially suitable for those who hope to resume activities as early as possible.

关键词： posterior cruciate ligament ligament-advanced reinforcement system hamstring tendon reconstruction

Gut microbial interactions based on network construction and bacterial pairwise cultivation

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Science China(Life Sciences) 2024年第8期67卷 1751-1762页

作者： Min-zhi jiang Chang Liu Chang Xu He jiang Yulin Wang Shuang-jiang Liu State Key Laboratory of Microbial Technology Shandong UniversityQingdao 266000China State Key Laboratory of Microbial Resources and Environmental Microbiology Research Center(EMRC)Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

Association networks are widely applied for the prediction of bacterial interactions in studies of human gut ***,the experimental validation of the predicted interactions is challenging due to the complexity of gut microbiomes and the limited number of cultivated *** this study,we addressed this challenge by integrating in vitro time series network(TSN)associations and cocultivation of TSN taxon *** samples were collected and used for cultivation and enrichment of gut microbiome on YCFA agar plates for 13 *** cells were harvested for DNA extraction and metagenomic sequencing.A total of 198 metagenome-assembled genomes(MAGs)were *** dynamics of bacteria growing on the YCFA agar were used to infer microbial association *** experimentally validate the interactions of taxon pairs in networks,we selected 24 and 19 bacterial strains from this study and from the previously established human gut microbial biobank,respectively,for pairwise *** co-culture experiments revealed that most of the interactions between taxa in networks were identified as neutralism(51.67%),followed by commensalism(21.67%),amensalism(18.33%),competition(5%)and exploitation(3.33%).Genome-centric analysis further revealed that the commensal gut bacteria(helpers and beneficiaries)might interact with each other via the exchanges of amino acids with high biosynthetic costs,short-chain fatty acids,and/or *** also validated 12 beneficiaries by adding 16 additives into the basic YCFA medium and found that the growth of 66.7%of these strains was significantly *** approach provides new insights into the gut microbiome complexity and microbial interactions in association *** work highlights that the positive relationships in gut microbial communities tend to be overestimated,and that amino acids,short-chain fatty acids,and vitamins are contributed to the positive relationships.

关键词： human gut microbiome gut microbial pairwise interaction co-culture association network microbial community

Plastic limit load analysis for pressure pipe with incomplete welding defects based on the extended Net Section Collapse Criteria

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第6期11卷 440-448页

作者： zhi-jiang JIN Cheng-hang jiang Xian-ping WAN Po CHEN Xiao-fang WANG Institute of Chemical Process Equipment Zhejiang University Hangzhou 310027 China

With von Mises yield criterion,the loading range of Net Section Collapse(NSC) Criteria is extended from combined tension and bending loadings to combined bending,torsion and internal pressure loadings.A new theoretical analyzing method of plastic limit load for pressure pipe with incomplete welding defects based on the extended NSC Criteria is presented and the correlative formulas are deduced,the influences of pipe curvature,circumferential length and depth of incomplete welding defects on the plastic limit load of pressure pipe are considered as well in this ***,according to the orthogonal experimental design method,the plastic limit loads are calculated by the finite element method and compared with the theoretical *** results show that the expressions of plastic limit load of pressure pipe with incomplete welding defects under bending,torsion and internal pressure based on extended NSC criteria are *** study provides an important theoretical basis for the establishment of safety assessment measure towards pressure pipe with incomplete welding defects.

关键词： Net Section Collapse(NSC) Criteria Incomplete welding defects Pressure pipe Plastic limit load Finite element

Simultaneous approach for simulation of a high-temperature gas-cooled reactor

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第7期12卷 567-574页

作者： Yang CHEN jiang-hong YOU zhi-jiang SHAO Ke-xin WANG Ji-xin QIAN State Key Laboratory of Industrial Control Technology Zhejiang University Hangzhou 310027 China

The simulation of a high-temperature gas-cooled reactor pebble-bed module(HTR-PM) plant is *** lumped parameter model has the form of a set differential algebraic equations(DAEs) that include stiff equations to model point neutron *** nested approach is the most common method to solve DAE,but this approach is very expensive and time-consuming due to inner *** paper deals with an alternative approach in which a simultaneous solution method is *** DAEs are discretized over a time horizon using collocation on finite elements,and Radau collocation points are *** resulting nonlinear algebraic equations can be solved by existing *** discrete algorithm is discussed in detail;both accuracy and stability issues are ***,the simulation results are presented to validate the efficiency and accuracy of the simultaneous approach that takes much less time than the nested one.

关键词： Differential algebraic equations(DAEs) High-temperature gas-cooled reactor(HTR) Simulation Simultaneous approach

Fusion expression of pedA gene to obtain biologically active pediocin PA-1 in Escherichia coli

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2011年第1期12卷 65-71页

作者： Shan-na LIU Ye HAN zhi-jiang ZHOU School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China

Two heterologous expression systems using thioredoxin (trxA) as a gene fusion part in Escherichia coli were developed to produce recombinant pediocin *** PA-1 structural gene pedA was isolated from Pediococcus acidilactici PA003 by the method of polymerase chain reaction (PCR),then cloned into vector pET32a(+),and expressed as thioredoxin-PedA fusion protein in the host strain *** BL21 (DE3).The fusion protein was in the form of inclusion body and was refolded before purification by nickel-iminodiacetic acid (Ni-IDA) agarose resin *** activity of recombinant pediocin PA-1 was analyzed after cleavage of the fusion protein by *** diffusion test revealed that 512-arbitrary unit (AU) recombinant pediocin PA-1 was obtained from 1 ml culture medium of *** (pPA003PED1) using Listeria monocytogenes as the indicator ***-PedA fusion gene was further cloned into pET20b(+).Thioredoxin-PedA fusion protein was detected in both the periplasmic and cytoplasmic *** recombinant pediocin PA-1 from the soluble fraction attained 384 AU from 1 ml culture medium of *** (pPA003PED2).Therefore,biologically active pediocin PA-1 could be obtained by these two hybrid gene expression methods.

关键词： Bacteriocin Fusion expression Inclusion body Pediocin PA-1 Thioredoxin

Ceramic-lined compound copper pipe prepared by SHS process

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中国有色金属学会会刊：英文版 2004年第Z1期14卷 106-110页

作者： FU Han-guang jiang zhi-qiang ZHANG Xiao-hong Department of Mechanical Engineering Tsinghua University Beijing 100084 China Department of Industrial Engineering Zhengzhou Institute of Aeronautics Zhengzhou China Taiyuan Iron and Steel (Group) Company Taiyuan China

Self-propagating high-temperature synthesis(SHS) is a new kind of material synthesis technique, and has characteristics with respect to low energy consumption, short synthetizing time, high production quantity, high product purity and no environmental pollution. When SHS combines with centrifugal casting, ceramic-lined compound copper pipe(CLCCP) can be produced, the inner surface of copper pipe can produce ceramic coatings having good wear and corrosion resistance. In order to increase the densification degree, combining strength and toughness of ceramic layer, the effects of additives such as SiO2, CrO3, Na2B4O7 and ZrO2 are researched, adding SiO2 and CrO3 in thermite, the densification degree of ceramic layer increases, adding Na2 B4 O7 in thermite can increase combining strength, adding ZrO2 in thermite can increase the toughness of ceramic layer. CLCCP is used in tubular billet crystallizer, having excellent service effects and decreasing the production cost of tubular billet.

关键词： SHS ceramic lining compound copper pipe crystallizer

Energy and Centrality Dependences of Pseudorapidity Distributions of Charged Particles in Cu+Cu Collisions

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Chinese Physics Letters 2012年第2期29卷 71-74页

作者： jiang zhi-Jin SUN Yu-Fen College of Science Shanghai Science and Technology UniversityShanghai 200093

We present the pseudorapidity distributions of charged particles in nucleus-nucleus collisions as functions of beam energy and impact parameter through weighted superposition of the pseudorapidity distributions in the effective binary nucleon-nucleon *** the theoretical model we then analyze the experimental measurements carried out by the BNL-RHIC-PHOBOS collaboration in Cu+Cu collisions at (√SNN) =200,62.4 and 22.4 *** model has only two free parameters and the theoretical results favor the experimental measurements well.

关键词： Collisions superposition parameter

Pure phase MoN: preparation by chemical-diffused permeation and enhanced conductivity with rare earth Gd

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Rare Metals 2015年第2期34卷 137-142页

作者： Xin Li Chao Gao Yu-zhi jiang Xi-Kun Li School of Materials Science and Engineering Shenyang Ligong University

MoN was prepared by rare earth Gd thermaldiffused permeation method via solid–gas interface reaction using（NH_4）_4[NiMo6O_24H_6]·7H_2O（abbreviated as NiMo6） as the precursor. Thermo-gravimetric differential thermal analysis（TG–DTA） was used to study the product＇s stability. The results of X-ray diffractometer（XRD）and X-ray photoelectron spectroscopy（XPS） indicate that a new hexagonal crystal MoN forms after the rare earth gas permeation and Gd3＋are diffused as substitution ions into the crystal lattice of MoN, and the surface valence of elemental content was measured by XPS. The conductivity results by direct current（DC） four-probe method show that MoN obtained from the Gd thermal permeation exhibits conductor character in the temperature range of 298–740 K and semiconductor behavior in 740–800 K.

关键词： Rare earth permeation MoN Conductivity Gd

Photocatalysis:from solar light to hydrogen energy

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Frontiers in Energy 2021年第3期15卷 565-567页

作者： Wenfeng SHANGGUAN Akihiko KUDO zhi jiang Yuichi YAMAGUCHI Research Center for Combustion and Environment Technology Shanghai Jiao Tong UniversityShanghai 200240China Department of Applied Chemistry Faculty of ScienceTokyo University of ScienceTokyo 162-8601Japan

The exploitation and utilization of fossil energy has caused serious problems such as environmental pollution and climate *** is imperative to develop renewable and clean energy *** energy is recognized as one of the most superior energy carriers in the world because of its characteristics of high energy density,convenient storage and transportation,and pollution-free energy conversion *** energy sources could be converted to hydrogen energy,of which,solar energy is abundant and ***,nowadays,the efficient conversion of solar energy to hydrogen energy has become one of the hot topics in the renewable energy *** based on the principles of Honda-Fujishima effect provides an opportunity to address the above *** recent years have witnessed the rapid growth of photocatalytic hydrogen production from photocatalysis and photoelectrocatalysis via solar light.

关键词： catalysis pollution convenient