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Chinese Chemical Letters 2024年第6期35卷 268-273页

作者： yi liu Zhe-Hao Wang Guan-Hua Xue lin Chen li-Hua Yuan yi-wen li Da-Gang Yu Jian-Heng Ye Key Laboratory of Green Chemistry&Technology of Ministry of Education College of ChemistrySichuan UniversityChengdu 610064China College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China State Key Laboratory of Elemento-Organic Chemistry Nankai UniversityTianjin 300071China

Dicarboxylic acids have a wide range of applications in the polymer industry to construct valuable *** has recently emerged as an efficient and sustainable strategy to generate dicarboxylic ***,photocatalytic dicarboxylation with CO_(2) is mainly limited to unsaturated bonds,and the dicarboxylation of C-C single bonds still remains a ***,we report a photocatalytic dicarboxylation of C-C single bonds in strained rings with CO_(2) units via consecutive photo-induced electron transfer(ConPET).It is also the first photocatalytic reductive ring-opening reaction of ***,this transition-metal-free protocol exhibits good functional group tolerance,broad substrate scope,facile scalability,and easy product ***,diacids can easily be derivatized to mainchain liquid crystalline polyesters.

关键词： Consecutive photo-induced electron transfer Visible-light catalysis Dicarboxylation Carbon dioxide Cyclopropanes

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人造黑色素染发材料

高分子学报 2024年第2期55卷 192-201页

作者：杨磊张小康张键华胡俊飞张婷顾志鹏李乙文四川大学高分子科学与工程学院高分子材料工程国家重点实验室成都610065

传统仿生人造黑色素聚多巴胺(PDA)染发过程中涉及的过强碱性会使毛发粗糙影响发质,大量的金属离子则存在安全性问题.本工作利用黑色素单体5,6-二羟基吲哚(DHI)能够在温和条件下仅通过空气氧化发生快速聚合的特点,报道了一种通过温和条... 详细信息

传统仿生人造黑色素聚多巴胺(PDA)染发过程中涉及的过强碱性会使毛发粗糙影响发质,大量的金属离子则存在安全性问题.本工作利用黑色素单体5,6-二羟基吲哚(DHI)能够在温和条件下仅通过空气氧化发生快速聚合的特点,报道了一种通过温和条件在头发表面和内部原位聚合的人造黑色素染发材料.染发色度值L=21,与自然黑发基本一致,洗涤30次后L=25,耐洗涤性良好,染色后头发拉伸强度189 MPa,断裂伸长率51%,相比染色前发质有所改善.研究结果表明,此类染发剂染发条件温和(空气氧化),色度自然,固色持久,有助于改善发质,生物安全性良好,为开发新一代染发剂提供了创新的设计策略和可靠的工具平台.

关键词：人造黑色素聚二羟基吲哚染发剂仿生材料

A novel heating area design of temperature-jump microfluidic chip for synchrotron radiation solution X-ray scattering

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Nuclear Science and Techniques 2016年第4期27卷 115-119页

作者： yi-wen li Feng-Gang Bian Jie Wang Shanghai Institute of Applied Physics Chinese Academy of Sciences Zhangjiang Campus Shanghai 201204 China University of Chinese Academy of Sciences Beijing 100049 China

In this paper, we present a novel design scheme of temperature-jump(T-jump) area for microfluidic *** simulation and experimental research of thermal characteristics of the solution in microchannels is *** simulation of the temperature-jump microchannel is analyzed to study the heat transfer characteristics by comparing performance of three proposed *** of the power requirement is discussed in the dimensional design of microheater. Temperature-sensitive fluorescent dye is applied to investigate the temperature field of microchannel heated by a designed microheater. It is found that the T-jump microfluidic device can provide rapid heating for solutions with strong convection heat transfer ability.

关键词：微流控芯片温升设计温度场 X射线散射同步辐射溶液微流体装置跳变

Biological effects of human lung cells MRC-5 in CBCT positioning for image-guided radiotherapy

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Nuclear Science and Techniques 2017年第5期28卷 95-99页

作者： Chu-Feng Jin Hui liu wen-yi li Rui-Fen Cao School of Nuclear Science and Technology University of Science and Technology of China Key Laboratory of Neutronics and Radiation Safety Institute of Nuclear Energy Safety TechnologyChinese Academy of Sciences

Image-guided radiotherapy(IGRT) provides precise positioning for the tumor target, but it may bring extra irradiation dose in the target positioning with a cone beam CT(CBCT) which has been increasingly used in IGRT. In this work, we focused on biological effects of the low-dose irradiation in IGRT, which have not been considered so far. Primary human fibroblasts cells from the lung and MRC-5 were irradiated by a CBCT. DNA doublestrand breaks(c-H2 AX foci) and micronucleus frequency of the irradiated samples were analyzed. Compared to the control, the c-H2 AX foci yields of the samples irradiated to 16 m Gy increased significantly, and the micronuclei rate of the samples irradiated for 3 days increased notably. The dose by imaging guidance device can be genotoxic to normal tissue cells, suggesting a potential risk of a secondary cancer. The effects, if confirmed by clinical studies,should be considered prudentially in designing IGRT treatment plans for the radiosensitive population, especially for children.

关键词： Image-guided radiotherapy Cone beam CT Imaging irradiation Biological effects Secondary cancer

Influence of phosphorus on Microcystis growth and the changes of other environmental factors

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Journal of Environmental Sciences 2005年第6期17卷 937-941页

作者： JIN Xiang-can CHU Zhao-sheng yi wen-li HU Xiao-zhen Research Center for Lake Ecology and Environments Chinese Research Academy of Environmental Sciences Beijing 100012 China Department of Resources and Environments Northwest Sci-Tech University of Agriculture and Forestry Shanxi 712100China

The growth processes of Microcystis aeruginosa （FACHB-41） in simulated Taihu Lake water with different phosphorus concentrations were investigated using laboratory microcosms. The algal biomass increased with the increase of phosphorus concentration when it was lower than 0.445 mg/L, while the dissolved oxygen （DO） and pH increased, dissolved inorganic nitrogen （DIN） and light intensity underwater（I） decreased. Responding to the changes of the “environmental factors”, the cellular carbohydrate and its ratio to cellular protein decreased generally as phosphorus increased. However, when phosphorus concentration was higher than l. 645 mg/L, the biomass, the “environmental factors”, the cellular carbohydrate and its ratio to cellular protein did not change likewise. Since the environmental factors and the physiological and biochemical responses are important factors, the change of environmental factors and cell physiology and biochemistry induced by phosphorus may become the key factors that steer the growth and dominance of Microcystis under certain conditions. To sum up, phosphorus not only stimulate the growth of Microcystis directly by supplying nutrient element, but also has complex interactions with other “environmental factors” and play important roles in the growth processes of Microcystis .

关键词： Microcystis aeruginosa microcosm phosphorus

Accessibility in key areas of the Arctic in the 21st mid-century

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Advances in Climate Change Research 2023年第6期14卷 896-903页

作者： Jin-Lei CHEN Shi-Chang KANG A-Dan WU li-Hong CHEN yi-wen li State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Key Laboratory of Remote Sensing of Gansu Province Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China School of Ocean Sciences China University of GeosciencesBeijing 100083China

The navigation potential of the Arctic has improved with the rapid retreat of sea ice under continuous *** comprehensive evaluation of Arctic accessibility for low ice-breaking ships(civil use)in the mid-century is important to support coordinated international *** this study,the hydrological conditions and navigation potential in key areas and crucial straits along the Northern Sea Route(NSR)and Northwest Passage(NWP)were assessed under Shared Socioeconomic Pathways(SSPs)using the Polar Operational limit Assessment Risk Indexing *** results showed that the most critical areas for navigation in the mid-century(2046-2055)are the waters around the New Siberian Islands and within the Parry *** navigability improves from SSP1-2.6 to SSP2-4.5 to SSP5-8.5,and the accessibility for PC7 ships under SSP2-4.5 is even better for OW ships under *** route on the north side of the New Siberian Islands is a relatively good choice within the NSR,and the southern route has a better navigation potential than the Parry Channel within the *** addition,the accessibility of the Dmitri Laptev Strait is better than that of the Sannikov Strait at a monthly scale,although the latter has more navigable ***,there is little difference in accessibility between the eastern and western parts of the Parry *** best nav-igation potential through the above straits is in September for ordinary ships,and the optimal time window is delayed and extended for PC7 *** results can serve as references for policy-making and navigation planning in the Arctic.

关键词： Arctic Sea ice Northeast passage Northwest passage CMIP6

Preparation of Polyaniline-coated Composite Aerogel of MnO2 and Reduced Graphene Oxide for High-performance Zinc-ion Battery

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Chinese Journal of Polymer Science 2020年第5期38卷 514-521,I0007页

作者： Jing Mao Fang-Fang Wu wen-Hui Shi wen-Xian liu Xi-lian Xu Gang-Feng Cai yi-wen li Xie-Hong Cao College of Materials Science and Engineering Zhejiang University of TechnologyHangzhou 310014China Center for Membrane Separation and Water Science&Technology Ocean CollegeZhejiang University of TechnologyHangzhou 310014China

Aqueous zinc-ion batteries,especially Zn-Mn02 battery,have attracted intensive attention owing to their unique features of high capacity,environmental friendliness,and ***,the problem of Mn dissolution hinders the development of zinc-ion batteries with long-term usage and high-rate *** this work,a novel preparation method for the polyaniline(PANI)-coated composite aerogel of Mn02 and rGO(MnO2/rGO/PANI)electrode is *** obtained composite possesses high electrical conductivity,and also effectively suppresses the dissolution of *** fabricated Mn02/rGO/PANI//Zn battery exhibits a high capacity of 241.1 mAh·g^-1 at 0.1 A·g^-1,and an excellent capacity retention of 82.7%after 600 charge/discharge *** addition,the rapid diffusion coefficient of the Mn02/rGO/PANI electrode was further examined by galvanostatic intermittent titration *** work provides new insights into the development of high-performance Zn-Mn02 battery with a better understanding of its diffusion kinetics.

关键词： Mn02 Polyaniline Composite aerogels Aqueous zinc-ion batteries Galvanostatic intermittent titration techniques

TLD calibration and absorbed dose measurement in a radiation-induced liver injury model under a linear accelerator

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Nuclear Science and Techniques 2023年第4期34卷 69-78页

作者： Hui-Hui Xiao ling-ling liu wen-yi li Bing-Bing li Xiang-li Cui Jie li Tao-Sheng li Zong-Tao Hu School of Basic Medical Sciences Anhui Medical UniversityHefei 230000China Hefei Cancer Hospital Chinese Academy of SciencesHefei 230000China Institute of Health and Medical Technology Hefei Institute of Materials ScienceChinese Academy of SciencesHefei 230000China University of Science and Technology of China Hefei 230000China Hefei Institute of Materials Science Chinese Academy of SciencesHefei 230000China

The application of a thermoluminescent detector(TLD) for dose detection at the liver irradiation site in mice under linear accelerator precision radiotherapy and the use of a single high dose to irradiate the mouse liver to construct a biological model of a radiation-induced liver injury(RILD) in mice were to determine the feasibility of constructing a precision radiotherapy model in small animals under a linear accelerator. A 360° arc volumetric rotational intensity-modulated radiotherapy(VMAT) plan with a prescribed dose of 2 Gy was developed for the planned target volume(PTV) at the location of the TLD within solid water to compare the difference between the measured dose of TLD and the assessed parameters in the TPS system. The TLD was implanted in the livers of mice, and VMAT was planned based on TLD to compare the measured and prescribed doses. C57BL/6 J mice were randomly divided into control and 25-Gy radiation groups and were examined daily for changes in body weight. They were euthanized at 3 and 10 weeks after radiation, and the levels of liver serum enzymes such as alanine aminotransferase(ALT), aspartate aminotransferase(AST), and alkaline phosphatase(ALP) were measured to observe any pathological histological changes in the irradiated areas of the mouse liver. The measured values of solid underwater TLD were within ± 3% of the Dmean value of the evaluation parameter in the TPS system. The mice in the 25-Gy radiation group demonstrated pathological signs of radiation-induced liver injury at the site of liver irradiation. The deviation in the measured and prescribed doses of TLD in the mouse liver ranged from-1.5 to 6%;construction of an accurate model of RILD using the VMAT technique under a linear accelerator is feasible.

关键词： Thermoluminescent detector Radiation-induced liver injury linear accelerator Volumetric rotational intensity-modulated radiotherapy

BL19U2:Small-angle X-ray scattering beamline for biological macromolecules in solution at SSRF

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Nuclear Science and Techniques 2020年第12期31卷 32-40页

作者： yi-wen li Guang-Feng liu Hong-Jin Wu Ping Zhou Chun-Xia Hong Na li Feng-Gang Bian Shanghai Advanced Research Institute(Zhangjiang Laboratory) Chinese Academy of SciencesShanghai 201204China CAS Key Laboratory of Molecular Virology and Immunology Institute Pasteur of ShanghaiChinese Academy of SciencesShanghai 200031China University of Chinese Academy of Sciences Beijing 100049China

The BL19U2 at the Shanghai Synchrotron Radiation Facility is a small-angle X-ray scattering beamline dedicated to structural studies pertaining to biological macromolecules in *** beamline has been officially opened to users in March 2015,and since then,a series of technological innovations has been developed to optimize beamline performance,thereby significantly improving the data collection efficiency and broadening the application scope of biological small-angle X-ray ***19U2 is ideal for the high-throughput screening of weakly scattered proteins,protein assemblies,nucleic acids,inorganic nanomaterials,and organic drug *** paper describes the design and overview of the BL19U2 *** sample environments at the experimental station and some recent scientific highlights are presented.

关键词： Shanghai synchrotron radiation facility Biological small-angle X-ray scattering High-throughput screening Biological macromolecules

An analytical model of hot rolling force for a thick plate by combining globally optimal approximation yield criterion and egg-circular velocity field

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Journal of Iron and Steel Research International 2024年第3期31卷 647-659页

作者： Shun-hu Zhang yi Zhang wen-hao Tian Yan li Shagang School of Iron and Steel Soochow UniversitySuzhou 215021JiangsuChina

For the sake of solving the problem that it is difficult to be integrated for the Mises specific plastic power due to its nonlinearity,a new linear criterion,named the globally optimal approximation criterion,is constructed by the polygonal approximation to the Mises *** new criterion is proved to be the linear function of the principal stress componentsσ1,σ2 andσ3 and the trajectory of it on theπ-plane is a non-equiangular but equilateral dodecagon intersecting the Mises *** theoretical results of the current criterion described by the Lode stress parameters are in excellent accordance with the experimental ***,according to the trend that the metallic flow velocity between rollers aggrandizes gradually from the inlet to the outlet during the hot rolling of a thick plate,a biomimetic velocity field is proposed in which the horizontal velocity component fits the egg-circular curve *** velocity field and its simulated results agree quite ***,using the determined linear criterion,energy analysis of the constructed velocity field is utilized to obtain the interior deformation power,while the vector decomposition approach is utilized to obtain the frictional power and shear *** this basis,the overall power is obtained and the analytical solutions are generated for the rolling torque,rolling force and the coefficient of the stress state under different egg curves by minimizing the neutral ***,the parameter optimization of the characteristic parameterρwhich affects the slope of the egg-circular curve is carried out and the best egg-circular curve which can minimize the energy consumption is *** best agreement between the theoretical and observed values of rolling force and rolling torque is under this curve,and the mean relative errors of the rolling torque and rolling force are no more than 2.93%,while the maximum error is no more than 8.35%.

关键词： yield criterion Plastic deformation Rolling force Velocity field Analytical solution