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扩链增黏回收PET的特性黏度和结晶行为研究

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中国塑料 2017年第2期31卷 17-20页

作者：曾以仁章家立华东交通大学材料科学与工程学院江西南昌330013

分别采用二苯基甲烷二异氰酸酯(MDI)和均苯四甲酸酐(PMDA)及两者的复配作为回收聚对苯二甲酸乙二醇酯(rPET)瓶片的扩链剂,用双螺杆挤出机熔融挤出工艺进行扩链增黏。结果表明,PMDA单独作为扩链剂时,rPET的特性黏度最高可达0.87 dL/g;采... 详细信息

分别采用二苯基甲烷二异氰酸酯(MDI)和均苯四甲酸酐(PMDA)及两者的复配作为回收聚对苯二甲酸乙二醇酯(rPET)瓶片的扩链剂,用双螺杆挤出机熔融挤出工艺进行扩链增黏。结果表明,PMDA单独作为扩链剂时,rPET的特性黏度最高可达0.87 dL/g;采用MDI单独扩链可使rPET的特性黏度达到0.68 dL/g;而当2种扩链剂按不同比例复配时,rPET的特性黏度变化在0.62~0.68 dL/g之间;分别用PMDA和MDI作rPET的扩链剂后,rPET的结晶温度有所下降,结晶焓小幅上升,结晶速率基本不变;复配扩链后结晶温度有所上升,结晶焓也有小幅上升,结晶速率基本不变。

关键词：回收聚对苯二甲酸乙二醇酯扩链剂结晶

Gut microbial metabolites-mediated modulation of colitis in mice by three geographically varied dietary patterns

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Food Science and Human Wellness 2024年

作者： Wenqing Yu Yuming Zhao Yuwei zhang Yaqian Li yiren Yang Junying Wang Hui Wang Hua Shi Chuqiao Xiao Mouming Zhao Jie Gao School of Light Industry and Food Engineering， Guangxi University School of Biomedical and Pharmaceutical Sciences， Guangdong University of Technology Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory

The Bama diet (BD)， Mediterranean diet (MD)， and Japanese diet (JD) are three typical dietary patterns from distinct geographical regions. The aim of this study was to compare the efficacy of three diets in preventing colitis through gut microbe-metabolite-mediated regulatory mechanisms. This was achieved by integrating gut microbiome and metabolomics analyses. Results showed that BD could significantly increase the level of IL-10， which has the potential to modulate the intestinal immune response. This was achieved by modulating the α-Linoleic acid metabolism and promoting Akkermansia proliferation. MD elevated IL-10 level and increased the expression of tight junction proteins such as Occludin， Claudin-1， and ZO-1. This effect might be attributed to the increased abundance of Bifidobacteria， which impacted the primary bile acid biosynthesis pathway. JD decreased TNF-α level and increased IL-10 level. This could be due to JD promoting the enrichment of Faecalibacterium， which affected the metabolism of arachidonic acid. Furthermore， the anti-inflammatory effects of the different metabolites， namely α-Linoleic acid， cholic acid， and arachidonic acid， were confirmed using the RAW264.7 cellular inflammation model.

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Functional analysis of the larval serum protein gene promoter from silkworm,Bombyx mori.

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Chinese Science Bulletin 2003年第23期48卷 2611-2615页

作者： TANG Shunming, YI Yongzhu, SHEN Xingjia, zhang Zhifang, LI yiren & HE Jialu Key Laboratory of Silkworm Biotechnology, Ministry of Agriculture, Sericultural Research Institute, Chinese Academy of Agricultural Sci-ences, Zhenjiang 212018, China Correspondence should be addressed to zhang Zhifang (e-mail: zjsbsri@ ***) Key Laboratory of Silkworm Biotechnology Ministry of Agriculture Sericultural Research Institute Chinese Academy of Agricultural Sciences Zhenjiang 212018 China

The regulation region of larval serum protein gene, Bombyx mori. (BmLSP), consisting of the first intron, the first exon, the central promoter region and 5′-upstream region, is cloned from genomic DNA from the silkworm va-riety of Suju譓inghu. Using PCR and restriction endonu-clease methods, a series of luciferase reporter plasmids, driven by different length of BmLSP promoters, are con-structed. Via the transient expression system in BmN cells, the effects of the regulation elements and foreign insect hor-mones on the BmLSP promoter activity are investigated. The results demonstrate that the promoter activity of BmLSP is 5.8- or 4.4-fold higher than that of BmLSPs whose first in-tron or the element in 5′-upstream region harboring the homologous sequence with the first intron of light-chain fib-roin gene (EHIF) is deleted, respectively, suggesting that both the first intron and EHIF contain the main positive cis-acting elements. However, the inactive mariner transposable ele-ment (MTE) in 5′-upstream region presents a negative effect. Furthermore, the effects of juvenile hormone analogue (JHA) on the BmLSP promoter activity show a typical dose-dependent manner, that is, low concentration treat-ments increase the BmLSP promoter activity and high con-centration treatments decrease it. Meanwhile, insect ecdy-sone (MH) treatments present no significant effect.

关键词：桑蚕血清蛋白基因抑制核酸内切酶法荷尔蒙

DNA Barcoding:An Effective Tool for Species Identification of Lepidopteran Oak Pests

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Animal Husbandry and Feed Science 2018年第2期10卷 103-108页

作者： Yang Ruisheng zhang Junyi Chen Yubo Wang Yong Jiang yiren Shi Shenglin Qin Li College of Bioscience and Biotechnology Shenyang Agricultural UnirersityLiaoning Engineering and Techuology Research Center for Insect Resource

[Objective] The paper was to improve the efficiency and accuracy of early forecast of Lepidopteran oak-infesting pests.[Method] DNA barcoding technique was established for quick species identification using mitochondrial cytochrome C oxidase subunit Ⅰ（COⅠ） as the standard *** barcoding technique was used to amplify and sequence genomic DNA samples from eggs and pupae of 11 species of Lepidopteran pests collected from oak.[Result] The DNA barcoding standard genes of 594-708 bp were determined from eggs and pupae of Lepidopteran *** were differences of 0-2 bases in DNA barcode sequences between conspecific eggs and pupae,with the sequence identity of 99.7%-100%.The average content of A,T,G and C of DNA barcode sequences from Lepidopteran insects were 30.7%,38.5%,14.9% and 15.9%,*** obtained DNA barcode sequences had 91.4%-100% identity and 0-8.6% difference degree with GenBank-deposited DNA barcode sequences from organisms of the genetically-closest *** them,DNA barcode sequences from egg and pupa samples of 10 Lepidopteran insects（No.1-20） had 99%-100% identity and 0-1.0% difference degree with homologous sequences in GenBank database,while the remaining samples（No.21-22） had high difference degree（8.6%） with homologous sequences.[Conclusion] The established DNA barcoding technique is an effeetive tool for species identification of Lepidopteran pests using genomic DNA from eggs and pupae of Lepidopteran insects.

关键词： DNA bareode Oak pest Lepidopteran insects Molecular identification Cytochrome CO Ⅰ

Mars Ion and Neutral Particle Analyzer (MINPA) for Chinese Mars Exploration Mission (Tianwen-1): Design and ground calibration

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Earth and Planetary Physics 2020年第4期4卷 333-344页

作者： LingGao Kong AiBing zhang Zhen Tian XiangZhi Zheng WenJing Wang Bin Liu Peter Wurz Daniele Piazza Adrian Etter Bin Su YaYa An JianJing Ding WenYa Li Yong Liu Lei Li yiren Li Xu Tan YueQiang Sun National Space Science Center Chinese Academy of SciencesBeijing 100190China Beijing Key Laboratory of Space Environment Exploration Beijing 100190China Key Laboratory of Science and Technology on Space Environment Situational Awareness Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Physics Institute University of BernBern 3012Switzerland State Key Laboratory of Space Weather Beijing 100190China University of Science and Technology of China Hefei 230026China National Astronomical Observatories Chinese Academy of SciencesBeijing 100012China

The main objective of the Mars Ion and Neutral Particle Analyzer(MINPA)aboard the Chinese Mars Exploration Mission(Tianwen-1)is to study the solar wind-Mars interaction by measuring the ions and energetic neutral atoms(ENAs)near *** MINPA integrates ion and ENA measurements into one sensor head,sharing the same electronics *** MINPA utilizes a standard toroidal top-hat electrostatic analyzer(ESA)followed by a time of flight(TOF)unit to provide measurement of ions with energies from 2.8 eV to 25.9 keV and ENAs from 50 eV to 3 keV with a base time resolution of 4 *** polished silicon single crystal substrates with an Al2O3 film coating are used to ionize the ENAs into positive *** ions can then be analyzed by the ESA and TOF,to determine the energy and masses of the *** MINPA provides a 360°×90°field of view(FOV)with 22.5°×5.4°angular resolution for ion measurement,and a 360°×9.7°FOV with 22.5°×9.7°angular resolution for ENA *** TOF unit combines a-15 kV acceleration high voltage with ultra-thin carbon foils to resolve H+,He2+,He+,O+,O2+and CO2+for ion measurement and to resolve H and O(≥16 amu group)for ENA *** we present the design principle and describe our ground calibration of the MINPA.

关键词： Mars ion energetic neutral atom electrostatic analyzer time of flight

A low-energy ion spectrometer with half-space entrance for three-axis stabilized spacecraft

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Science China(Technological Sciences) 2019年第6期62卷 1015-1027页

作者： HU RenXiang SHAN Xu YUAN GuangYuan WANG ShuWen zhang WeiHang QI Wei CAO Zhe LI yiren CHEN ManMing YANG XiaoPing WANG Bo SHAO SiPei LI Feng ZHONG XiaoQing FAN Dan HAO XinJun FENG ChangQing SU ZhenPeng SHEN ChengLong LI Xin DAI GuYue QIU BingLin PAN ZongHao LIU Kai XU ChunKai LIU ShuBin AN Qi zhang TieLong WANG YuMing CHEN XiangJun Hefei National Laboratory for Physical Sciences at the Microscale Department of Modern Physics University of Science and Technology of China Hefei 230026 China State Key Laboratory of Particle Detection and Electronics (IHEP-USTC) Department of Modern Physics University of Science and Technology of China Hefei 230026 China CAS Key Laboratory of Geospace Environment School of Earth and Space Sciences University of Science and Technology of China Hefei 230026 China Shandong Institute of Space Electronic Technology Yantai 264003 China Institute of Telecommunication Satellite China Academy of Space Technology Beijing 100094 China

A low-energy ion spectrometer(LEIS) for use aboard three-axis stabilized spacecraft has been developed to measure ion energy per charge distribution in three-dimensional space with good energy-, angular-and temporal-resolutions. For the standard top-hat electrostatic analyzer used widely in space plasma detection, three-axis stabilized spacecraft makes it difficult to obtain complete coverage of all possible ion arrival directions. We have designed angular scanning deflectors supplementing to a cylindrically symmetric top-hat electrostatic analyzer to provide a half-space field of view as 360°×90°(–45°–+45°), and fabricated the LEIS flight model for detecting magnetospheric ions in geosynchronous orbit. The performance of this payload has been evaluated in detail by a series of simulation and environmental tests, and the payload has also been calibrated through laboratory experiments using a low-energy ion source. The results show that capabilities of the LEIS payload are in accordance with the requirements of a magnetospheric mission.

关键词： low-energy ion spectrometer three-dimensional measurement top-hat electrostatic analyzer angular scanning deflectors simulation ground calibration

Digital Simulation of Projective Non-Abelian Anyons with 68 Superconducting Qubits

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Chinese Physics Letters 2023年第6期40卷 1-7页

作者： Shibo Xu Zheng-Zhi Sun Ke Wang Liang Xiang Zehang Bao Zitian Zhu Fanhao Shen Zixuan Song Pengfei zhang Wenhui Ren Xu zhang Hang Dong Jinfeng Deng Jiachen Chen Yaozu Wu Ziqi Tan Yu Gao Feitong Jin Xuhao Zhu Chuanyu zhang Ning Wang yiren Zou Jiarun Zhong Aosai zhang Weikang Li Wenjie Jiang Li-Wei Yu Yunyan Yao Zhen Wang Hekang Li Qiujiang Guo Chao Song H.Wang Dong-Ling Deng School of Physics ZJU-Hangzhou Global Scientific and Technological Innovation CenterInterdisciplinary Center for Quantum Informationand Zhejiang Province Key Laboratory of Quantum Technology and DeviceZhejiang UniversityHangzhou 310027China Center for Quantum Information IIISTsinghua UniversityBeijing 100084China Theoretical Physics Division Chern Institute of Mathematics and LPMCNankai UniversityTianjin 300071China Hefei National Laboratory Hefei 230088China Shanghai Qi Zhi Institute Shanghai 200232China

Non-Abelian anyons are exotic quasiparticle excitations hosted by certain topological phases of *** break the fermion-boson dichotomy and obey non-Abelian braiding statistics:their interchanges yield unitary operations,rather than merely a phase factor,in a space spanned by topologically degenerate *** are the building blocks of topological quantum ***,experimental observation of non-Abelian anyons and their characterizing braiding statistics is notoriously challenging and has remained elusive hitherto,in spite of various theoretical ***,we report an experimental quantum digital simulation of projective non-Abelian anyons and their braiding statistics with up to 68 programmable superconducting qubits arranged on a two-dimensional *** implementing the ground states of the toric-code model with twists through quantum circuits,we demonstrate that twists exchange electric and magnetic charges and behave as a particular type of non-Abelian anyons,i.e.,the Ising *** particular,we show experimentally that these twists follow the fusion rules and non-Abelian braiding statistics of the Ising type,and can be explored to encode topological logical ***,we demonstrate how to implement both single-and two-qubit logic gates through applying a sequence of elementary Pauli gates on the underlying physical *** results demonstrate a versatile quantum digital approach for simulating non-Abelian anyons,offering a new lens into the study of such peculiar quasiparticles.

关键词： topological Abelian quantum

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利用改进开窗转换法确定沥青离散松弛时间谱

哈尔滨工业大学学报 2014年第2期46卷 104-108页

作者：陈静云孙依人徐辉张岩大连理工大学交通运输学院辽宁大连116024

为了精确地获得沥青胶结料的离散松弛时间谱,提出了一种改进开窗转换法的线性黏弹性材料函数转换算法.此方法可以用于离散延迟时间谱和离散松弛时间谱的相互转换.与开窗转换法相比,改进开窗转换法对于时间常数的设置更加精确,并且不会... 详细信息

为了精确地获得沥青胶结料的离散松弛时间谱,提出了一种改进开窗转换法的线性黏弹性材料函数转换算法.此方法可以用于离散延迟时间谱和离散松弛时间谱的相互转换.与开窗转换法相比,改进开窗转换法对于时间常数的设置更加精确,并且不会产生负数谱线.将改进开窗转换法用于一种传统非改性沥青的弯曲梁流变仪试验数据的离散延迟时间谱的转换,成功地确定了相应的离散松弛时间谱.经有限元模型验证表明,此离散松弛时间谱能很好地还原该沥青结合料的应力松弛特性.

关键词：改进开窗转换法黏弹性蠕变试验 Prony级数

Tianwen-1 MINPA observations in the solar wind

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Earth and Planetary Physics 2022年第1期6卷 1-9页

作者： AiBing zhang LingGao Kong WenYa Li Lei Li BinBin Tang ZhaoJin Rong Yong Wei JiJie Ma YiTeng zhang LiangHai Xie YuXian Wang JianSen He Bin Liu WenJing Wang Bin Su JiaWei Li Xu Tan Fang Wang TaiFeng Jin FuHao Qiao Peter Wurz Yan Zhu YunFei Bai yiren Li XinBo Zhu YueQiang Sun YongLiao Zou Chi Wang National Space Science Center Chinese Academy of SciencesBeijing 100190China Beijing Key Laboratory of Space Environment Exploration Beijing 100190China Key Laboratory of Science and Technology on Space Environment Situational Awareness Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Space Weather Chinese Academy of SciencesBeijing 100190China Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Institute of Space Physics and Applied Technology Peking UniversityBeijing 100871China Lunar Exploration and Space Engineering Center Beijing 100190China National Astronomical Observatories Chinese Academy of SciencesBeijing 100012China Physics Institute University of BernBern 3012Switzerland University of Science and Technology of China Hefei 230026China Shanghai Academy of Spaceflight Technology Shanghai 201109China

The Mars Ion and Neutral Particle Analyzer(MINPA)is one of the three scientific instruments onboard the Tianwen-1 orbiter to investigate the Martian space *** Tianwen-1’s transfer orbit to Mars,the MINPA was switched on to measure the solar wind ***,we present the first results of the MINPA observations in the solar *** cruise,nearly half of the MINPA ion field-of-view(FOV)was blocked by the lander capsule;thus only the solar-wind ions with azimuthal speeds pointing towards the unblocked FOV sectors could be *** perform a detailed comparison of the MINPA’s solar wind observations with data from Earth-based missions when MINPA reached its count-rate peak,finding a general consistency of the ion moments between *** blocking effect due to the lander is evaluated quantitatively under varying solar-wind velocity *** the blocking effect,the MINPA’s solar wind measurements during the transfer orbit suggest a good performance.

关键词： MINPA Tianwen-1 solar wind capsule blocking effect