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Polymer Radii and Moments in the Polycondensation Reaction of A_a Type

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Chemical Research in Chinese Universities 1990年第4期6卷 370-372页

作者： Li Zesheng, Sun Jiazhong, Ba Xinwu and Tang Aoqing (institute of theoretical chemistry, jilin university, changchun)

For the polycondensation reaction of A. type, the kth radius for k>2 can be expressed in terms of polymer moments.

关键词： Polymer radii Polymer moment Polycondensation

Open metallocenes Ⅶ. The syntheses and low temperature X-ray diffraction analyses of bis-(2,4-dimethylpentadienyl)-vanadium monocarbonyl

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Chinese Journal of chemistry 1987年第2期5卷 105-111页

作者： YANG Guang-Di LIU Ju-Zheng* FAN Yu-Quo LIANG Ying-Qiu, institute of theoretical chemistry, jilin university, changchun institute of theoretical chemistry Jilin University Changchun

open metallocene compound, [2,4-（CH3）2C5H5]2VCO has been synthesized anda low temperature （-60℃） X-ray diffraction technique. The compound crystallizesin an orthorhombic space group P2I2I2Iwith lattice parameters a=9.921 （6）, b=9.899（6）, c=14.491（8）, Z=4. The structure was refined by the block-matrix least-squares the final R=0.087

关键词： dimethylpentadienyl vanadium monocarbonyl Open metallocenes The syntheses and low temperature X-ray diffraction analyses of bis

Configuration Reversion of the Metal Chelates of N-hydroxyethyl Ethylenediaminetriacetic Acid——Dynamic NMR Study

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Chemical Research in Chinese Universities 1992年第2期8卷 129-131页

作者： LI Fei, SONG Rui-fang and LI Liang (institute of theoretical chemistry, jilin university, changchun, 13002.)

The intramolecular acetate rearrangement of the aminocarboxylate metal chelates with the hexdentate-coordinate has been investigated by dynamic NMR in recent years. However, the intramolecular processes of the metal q... 详细信息

关键词： Intramolecular rearrangement Mechanism Dynamic NMR Metal che-late Quinquedentate HEDTA ligand

Characterizing structural variants based on graph-genotyping provides insights into pig domestication and local adaption

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Journal of Genetics and Genomics 2024年第4期51卷 394-406页

作者： Xin Li Quan Liu Chong Fu Mengxun Li changchun Li Xinyun Li Shuhong Zhao Zhuqing Zheng Key Lab of Agricultural Animal Genetics Breeding and Reproduction of Ministry of Education and Key Laboratory of Swine Genetics and Breeding of Ministry of AgricultureCollege of Animal Science and TechnologyHuazhong Agricultural UniversityWuhanHubei 430070China institute of Agricultural Biotechnology Jingchu University of TechnologyJingmenHubei 448000China The Cooperative Innovation Center for Sustainable Pig Production WuhanHubei 430070China Hubei Hongshan Laboratory WuhanHubei 430070China

Structural variants(SVs),such as deletions(DELs)and insertions(INSs),contribute substantially to pig genetic diversity and phenotypic *** a library of SVs discovered from long-read primary assemblies and short-read sequenced genomes,we map pig genomic SVs with a graph-based method for re-genotyping SVs in 402 *** results demonstrate that those SVs harboring specific trait-associated genes may greatly shape pig domestication and local *** characterization of SVs reveals that some population-stratified SVs may alter the transcription of genes by affecting regulatory *** identify that the genotypes of two DELs(296-bp DEL,chr7:52,172,101e52,172,397;278-bp DEL,chr18:23,840,143 e23,840,421)located in muscle-specific enhancers are associated with the expression of target genes related to meat quality(FSD2)and muscle fiber hypertrophy(LMOD2 and WASL)in *** results highlight the role of SVs in domestic porcine evolution,and the identified candidate functional genes and SVs are valuable resources for future genomic research and breeding programs in pigs.

关键词： Pigs Structural variation Selection signatures Regulatory elements

Study on green power supply modes for heavy load in Remote Areas

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Global Energy Interconnection 2024年第4期7卷 475-485页

作者： Yu Li Yixi Cuomu Yiming Gao Guoqin Lv Weiwei Lin Sirui Li changchun Zhou State Grid Xizang Electric Power Co. Ltd.Lhasa 850010Tibet Autonomous RegionP.R.China Global Energy Interconnection Development and Cooperation Organization Beijing 100031P.R.China State Grid Fujian Power Economic Research institute Fuzhou 350012P.R.China Eindhoven university of Technology Eindhoven.5621 AENetherlands

In this study,the present situation and characteristics of power supply in remote areas are *** studying the cases of power supply projects in remote areas,the experience is analyzed and described,and the applicability of related technologies,such as grid-forming storage and power load management,is studied,including grid-connection technologies,such as grid-forming converters and power load *** this basis,three power-supply modes were *** application scenarios and advantages of the three modes were compared and *** on the local development situation,the temporal sequences of the three schemes are described,and a case study was *** study of the heavy-load power supply mode in remote areas contributes to solving the problem of heavy-load green power consumption in remote areas and promoting the further development of renewable energy.

关键词： Remote area Renewable energy Grid-forming storage Power load management Power supply mode

Synthesis of Macroporous and High Crosslinking Styrene-Methacryloyloxyphenyl Propane-(bisvinyl-A) Copolymers

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Chemical Research in Chinese Universities 1995年第2期11卷 155-157页

作者： JU Zhi-qiang,WU Tong-hao,YANG Hong-mao,JIANG Yu-zi and TANG Xin-yi (Department of chemistry,jilin university,changchun,13002.)ZHAO Bing(Key Laboratory of Molecular Spectrum and Molecular Structure institute of theoretical chemistry,jilin university,changchun,13002.)

Up till now, the crosslinking agent used in the preparation of highcrosslinking polystyrene has usually been divinylbenzene(DVB), which usually results in the crosslinking net structure of styrene-DVB copolymer being uneven. On the contrary, bisvinyl-A has the well compatibility with styrene,which can polymerize to form an even copolvmer, this copolymer has well

关键词： Styrcne Methacryloyioxyphenyl propane (bisvinyl-A) Macroporous structure Synthesis and characterization

COMPUTATION OF HOPF BRANCHES BIFURCATING FROM A HOPF/PITCHFORK POINT FOR PROBLEMS WITH Z_2-SYMMETRY

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Journal of Computational Mathematics 1998年第5期16卷 403-416页

作者： Bai－sheng Wu (Department of Mathematics,jilin university, changchun 13002., china)Tassilo Kupper (institute of Mathematics, university of Cologne, D-50931 Koln, Germany) jilin Univ Dept Math Changchun 130023 Peoples R China Univ Cologne Inst Math D-50931 Cologne Germany

This paper is concerned with the computation of Hopf branches emanating from a Hopf/Pitchfork point in a two-parametor nonlinear problem satisfying a Z2symnletry condition. Our aim is to present a new al,proach to the theoretical and computational analysis of the bifurcating Hopf branches at this singular point by using the system designed to calculate Hopf points and exploring its symmetry. It is shown that a Hopf/Pitchfork point is a pitchfork bifurcation point in the *** standard continuation and branch-switching can be used to compute these Hopf branches. In addition, an effect method based on the extended system of the singular points is developed for the computation of branch of secondary (nonsymmetric) Hopf points. The implementation of Newton's method for solving the extended system is also discussed. A numerical example is ***: Hopf/Pitchfork point, Z2-symmetry, Hopf point, bifurcation, Extended system

关键词： Hopf/pitchfork point Z_2-symmetry Hopf point bifurcation Extended system

One-way successive plate cross wedge rolling machine

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Science china(Technological Sciences) 2010年第1期53卷 164-167页

作者： SONG YuQuan,WANG MingHui & LI ZhiGang Superplasticity and Plasticity Research institute,jilin university,changchun 13002.,china 1. Superplasticity and Plasticity Research institute Jilin University Changchun 130022 China

In our last paper(Sci china Ser E-Tech Sci,2009,52(11):3117-3121) we designed the precision forming machine with rolling plate CWR(cross wedge rolling).This kind of machine colligates the advantages of high rigidity and small floor space for roller CWR machine and those of simple die manufacture and high precision for plate CWR *** the same time,it abandons the shortcomings of complex die manufacture and poor precision for roller CWR machine,and those of poor rigidity and large floor space for plate CWR *** rolling,the upper and lower rolling plates of the machine make reciprocating slide toward or away from each other,so the inertial forces should be overcome,which will cause great energy loss,besides,large floor space is needed when the rolled workpiece is *** order to solve the above problems,this paper presents the one-way successive plate CWR machine,whose rolling plates need not make reciprocating ***,it has high energy utilization efficiency and production ***,the roll scale can be removed *** particular,the machine can produce large axisymmetrical workpieces.

关键词： cross wedge rolling plate one-way successive

Portable fluorescence instrument for detecting membrane integrity in membrane bioreactor (MBR)

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Frontiers of Environmental Science & Engineering 2024年第2期18卷 121-131页

作者： Yang Yu changchun Xin Yuxiang Liu Fei Gao Lei Zhang Hui Jia Jie Wang State Key Laboratory of Separation Membranes and Membrane Processes Tiangong UniversityTianjin 300387China School of Environmental Science and Engineering Tiangong UniversityTianjin 300387China School of Environmental Science and Engineering Tianjin UniversityTianjin 300072China Shenyang Academy of Environmental Sciences Shenyang 110167China Cangzhou institute of Tiangong university Tiangong UniversityCangzhou 061000China

This study proposed the design, fabrication, and assembly of membrane integrity detection instruments in membrane bioreactors (MBR) based on fluorescence spectroscopy. Based on the PARAFAC model, we found that the peak at 280/335 nm strengthened after membrane breakage. The peak at 340/430 nm reflected the sludge concentration in the MBR and reduced the influence of internal filtration effects on detection. Therefore, we determined that the dual-LED light source excitation detection system can detect tryptophan-like substances at 280 nm (T-peak) and humic acid at 340 nm (C-peak). T-peak was identified as the core index indicating membrane integrity. Moreover, the C-peak is the reference indicator factor for a sensitive response to changes in the sludge concentration. The portable fluorescence instrument exhibited high sensitivity and good feedback accuracy compared to particle counting and turbidity detection, where the log reduction value was greater than 3.5. This overcomes the disadvantage of false alarms in particle counters and is not affected by the position of the pump system. This portable instrument provides a flexible and highly sensitive method for the assessment of industrial membrane integrity.

关键词： Membrane integrity Fluorescence spectrum Portable instrument Membrane bioreactor