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Molecular Mobility in the Amorphous Phase Determines the Critical Strain of Fibrillation in the Tensile Stretching of Polyethylene

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Chinese Journal of Polymer Science 2020年第7期38卷 740-747,I0006页

作者： rui Li Guo-Xing Yang Ya-Nan qin Li Liu Zhi-Yong Jiang School of Chemistry and Chemical Engineering State Key Laboratory of Urban Water Resource and EnvironmentHarbin Institute of TechnologyHarbin 150001China Daqing Petrochemical Research Center Petrochemical Research InstituteChina National Petroleum CorporationDaqing 163714China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China

The microstructural development of bimodal high density polyethylene subjected to tensile deformation was investigated as a function of strain after annealing at different temperatures by means of a scanning synchrotron small angle X-ray scattering(SAXS)*** different deformation mechanisms were activated in sequence upon tensile deformation:intralamellar slipping of crystalline blocks dominates the deformation behavior at small deformations whereas a stress-induced crystalline block fragmentation and recrystallization process occurs at a critical strain yielding new crystallites with the molecular chains preferentially oriented along the drawing *** critical strain associated with the lamellar-to-fibrillar transition was found to be ca.0.9 in bimodal sample,which is significantly larger than that observed for unimodal high-density polyethylene(0.4).This observation is primarily due to the fact that the bimodal sample possesses a greater mobility of the amorphous phase and thereby a reduced modulus of the entangled amorphous *** conclusion of the mobility of the amorphous phase as a determining factor for the critical strain was further proven by the 1H-NMR T2 relaxation *** these findings contribute to our understanding of the excellent slow crack growth resistance of bimodal polyethylene for pipe application.

关键词： SAXS Bimodal high density polyethylene Molecular mobility

Attention Markets of Blockchain-Based Decentralized Autonomous Organizations

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IEEE/CAA Journal of Automatica Sinica 2024年第6期11卷 1370-1380页

作者： Juanjuan Li rui qin Sangtian Guan Wenwen Ding Fei Lin Fei-Yue Wang State Key Laboratory of Multimodal Artificial Intelligence Systems Institute of AutomationChinese Academy of SciencesBeijing 100190China Faculty of Innovation Engineering Macao University of Science and TechnologyMacao 999078China State Key Laboratory for Management and Control of Complex Systems Chinese Academy of SciencesBeijing 100190 Faculty of Innovation Engineering Macao University of Science and TechnologyMacao 999078China IEEE

The attention is a scarce resource in decentralized autonomous organizations(DAOs),as their self-governance relies heavily on the attention-intensive decision-making process of“proposal and voting”.To prevent the negative effects of pro-posers’attention-capturing strategies that contribute to the“tragedy of the commons”and ensure an efficient distribution of attention among multiple proposals,it is necessary to establish a market-driven allocation scheme for DAOs’***,the Harberger tax-based attention markets are designed to facilitate its allocation via continuous and automated trading,where the individualized Harberger tax rate(HTR)determined by the pro-posers’reputation is ***,the Stackelberg game model is formulated in these markets,casting attention to owners in the role of leaders and other competitive proposers as *** equilibrium trading strategies are also discussed to unravel the intricate dynamics of attention ***,utilizing the single-round Stackelberg game as an illustrative example,the existence of Nash equilibrium trading strategies is ***,the impact of individualized HTR on trading strategies is investigated,and results suggest that it has a negative correlation with leaders’self-accessed prices and ownership duration,but its effect on their revenues varies under different *** study is expected to provide valuable insights into leveraging attention resources to improve DAOs’governance and decision-making process.

关键词： Attention decentralized autonomous organizations Harberger tax Stackelberg game.

Multi-Blockchain Based Data Trading Markets With Novel Pricing Mechanisms

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IEEE/CAA Journal of Automatica Sinica 2023年第12期10卷 2222-2232页

作者： Juanjuan Li Junqing Li Xiao Wang rui qin Yong Yuan Fei-Yue Wang IEEE the State Key Laboratory of Multimodal Artificial Intelligence Systems Institute of AutomationChinese Academy of SciencesBeijing 100190China the College of Computer Science and Engineering Shandong University of Science and TechnologyQingdao 266590China the School of Artificial Intelligence Anhui UniversityHefei 266114 the qingdao Academy of Intelligent Industries Qingdao 230031China the School of Mathematics Renmin University of ChinaBeijing 100872China the State Key Laboratory for Management and Control of Complex Systems Chinese Academy of SciencesBeijing 100190 the Faculty of Innovation Engineering Macao University of Science and TechnologyMacao 999078China

In the era of big data,there is an urgent need to establish data trading markets for effectively releasing the tremendous value of the drastically explosive *** security and data pricing,however,are still widely regarded as major challenges in this respect,which motivate this research on the novel multi-blockchain based framework for data trading markets and their associated pricing *** this context,data recording and trading are conducted separately within two separate blockchains:the data blockchain(DChain) and the value blockchain(VChain).This enables the establishment of two-layer data trading markets to manage initial data trading in the primary market and subsequent data resales in the secondary ***,pricing mechanisms are then proposed to protect these markets against strategic trading behaviors and balance the payoffs of both suppliers and ***,in regular data trading on VChain-S2D,two auction models are employed according to the demand scale,for dealing with users’ strategic *** incentive-compatible Vickrey-Clarke-Groves(VCG)model is deployed to the low-demand trading scenario,while the nearly incentive-compatible monopolistic price(MP) model is utilized for the high-demand trading *** temporary data trading on VChain-D2S,a reverse auction mechanism namely two-stage obscure selection(TSOS) is designed to regulate both suppliers’ quoting and users’ valuation ***,experiments are carried out to demonstrate the strength of this research in enhancing data security and trading efficiency.

关键词： Auction data trading markets multi-blockchain pricing mechanisms

固相萃取-超高效液相色谱-串联质谱法测定蜂蜜中39种植物源性毒素

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食品科学 2025年第2期46卷 231-239页

作者：刘川陈燕秋林浩汪璐瑶石培育刘蓉王义吴文林毛锐肖全伟宋娟戴琴成都市食品检验研究院四川成都611130 国家市场监督管理总局重点实验室(新食品原料监测与评价) 四川成都611130 国家市场监督管理总局重点实验室(营养与健康化学计量及应用) 北京100029 辐照保藏四川省重点实验室四川成都611130

为有效评估蜂蜜中可能残留多种植物源性毒素的食品安全风险,建立和验证固相萃取-超高效液相色谱-串联质谱测定蜂蜜中39种植物源性毒素的检测方法。试样经0.1%甲酸水提取,HLB小柱净化,多反应监测模式检测,基质匹配外标法定量。本方法中3... 详细信息

为有效评估蜂蜜中可能残留多种植物源性毒素的食品安全风险,建立和验证固相萃取-超高效液相色谱-串联质谱测定蜂蜜中39种植物源性毒素的检测方法。试样经0.1%甲酸水提取,HLB小柱净化,多反应监测模式检测,基质匹配外标法定量。本方法中39种植物源性毒素在各自浓度范围内线性关系良好,平均回收率介于78.7%~112.8%,相对标准偏差介于1.6%~15.2%(n=6)。该方法具有操作简单、检测通量大、灵敏度高等特点,能够满足蜂蜜中该类毒素监测的应用需求。在实际36批次样品的检测过程中,部分样品分别检出了不同含量的吡咯里西啶生物碱和闹羊花毒素III,证明蜂蜜中确具有残留该类植物毒素的风险。

关键词：固相萃取超高效液相色谱-串联质谱蜂蜜植物源性毒素

Fabrication of carboxymethyl chitosan–hemicellulose resin for adsorptive removal of heavy metals from wastewater

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Chinese Chemical Letters 2017年第3期28卷 625-632页

作者： Shu-Ping Wu Xiang-Zi Dai Jia-rui Kan Fang-Di Shilong mai-Yong Zhu Institute of Polymer Materials School of Materials Science and Engineering Jiangsu University Zhenjiang 212013 China

Carboxymethyl chitosan–hemicellulose resin（CMCH） was synthesized by thermal cross-linking process and characterized by FTIR, TGA, and SEM. Subsequently, the adsorption properties of CMCH toward Ni（Ⅱ）,Cd（Ⅱ）, Cu（Ⅱ）, Hg（Ⅱ）, Mn（Ⅶ） and Cr（Ⅵ） were evaluated. Various factors affecting the uptake behavior such as pH, temperature, contact time and the initial concentration of the metal ions were *** results showed that all adsorption processes fit the pseudo-second-order model and Langmuir isotherm equation. Significantly, the regeneration experiments showed CMCH can be used as a potentially recyclable and effective adsorbent for the removal and recovery of metal ions from wastewater.

关键词： Biomass Carboxymethyl chitosan Hemicellulose Heavy metalions Adsorbent

Effects of Dietary Vitamin D_(3)on Growth Performance,Immune Status,and Calcium and Phosphorus Metabolism in Litopenaeus vannamei Under Different Salinity Conditions

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Journal of Ocean University of China 2023年第4期22卷 1023-1033页

作者： LIU Miao ZHANG Hui SHAO rui ZHOU Xueqi ZHOU Qicun mai Kangsen AI qinghui WAN Min Key Laboratory of Aquaculture Nutrition and Feed Ministry of Agriculture&Key Laboratory of MaricultureMinistry of EducationCollege of FisheriesOcean University of ChinaQingdao 266003China Laboratory of Fish and Shellfish Nutrition School of Marine SciencesNingbo UniversityNingbo 315211China

Vitamin D_(3)(VD_(3)) plays a vital role in various physiological processes in addition to its role in regulating the homeostasis of calcium and *** present study was conducted to investigate the effects of dietary VD_(3) on growth performance,immune status and the metabolism of calcium and phosphorus in Litopenaeus vannamei under the optimal salinity(25)and high salinity(35)***(2.1 g±0.1 g)were fed with experimental diets containing 0,1500,6000 and 12000IUkg^(−1)VD_(3) for 30 days under two salinity conditions *** results showed that the growth performance and intestinal health were reduced,while oxidative stress was induced in the shrimp cultured at salinity 35 compared to those in the shrimp cultured at salinity ***,dietary supplementation of 1500 IU kg^(−1)VD_(3) at salinity 35 promoted the growth performance,improved the intestinal health,and enhanced the antioxidant capacity and non-specific immunity in *** addition,the content of inorganic phosphorus in shrimp serum was affected by dietary VD_(3) independent of *** contrast,the expressions of calcium transport-related genes,including calmodulin and Ca2+-ATPase,were regulated by salinity,instead of dietary VD_(3).In conclusion,an appropriate supplementation of dietary VD_(3) under high-salt condition can promote the growth,alleviate intestinal inflammation,enhance antioxidant capacity and immunity,and contribute to phosphorus metabolism in ***.

关键词： vitamin D_(3) Penaeus vannamei salinity antioxidant capacity immunity metabolism intestinal health

A Primal-Dual Interior-Point Method for Optimal Grasping Manipulation of Multi-fingered Hand-Arm Robots

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Journal of the Operations Research Society of China 2017年第2期5卷 177-192页

作者： Yan-qin Bai Xue-rui Gao Chang-Jun Yu Department of Mathematics Shanghai UniversityShanghai 200444China

In this paper,we consider an optimization problem of the grasping manipulation of multi-fingered hand-arm *** first formulate an optimization model for the problem,based on the dynamic equations of the object and the friction con***,we reformulate the model as a convex quadratic programming over circular ***,we propose a primal-dual interior-point algorithm based on the kernel function to solve this convex quadratic programming over circular *** derive both the convergence of the algorithm and the iteration bounds for largeand small-update methods,***,we carry out the numerical tests of 180◦and 90◦manipulations of the hand-arm robot to demonstrate the effectiveness of the proposed algorithm.

关键词： Grasping manipulation Circular cone programming Primal-dual interior-point algorithm Numerical tests

Computational Modeling of Intergranular Crack Propagation in an Intermetallic Compound Layer

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Computer Modeling in Engineering & Sciences 2023年第5期135卷 1481-1502页

作者： Tong An rui Zhou Fei qin Pei Chen Yanwei Dai Yanpeng Gong Institute of Electronics Packaging Technology and Reliability Faculty of Materials andManufacturingBeijing University of TechnologyBeijing100124China Beijing Key Laboratory of Advanced Manufacturing Technology Beijing University of TechnologyBeijing100124China

A micromechanical model is presented to study the initiation and propagation of microcracks of intermetallic compounds(IMCs)in solder *** effects of the grain aggregate morphology,the grain boundary defects and the sensitivity of the various cohesive zone parameters in predicting the overall mechanical response are *** overall strength is predominantly determined by the weak grain interfaces;both the grain aggregate morphology and the weak grain interfaces control the crack configuration;the different normal and tangential strengths of grain interfaces result in different intergranular cracking behaviors and play a critical role in determining the macroscopic mechanical response of the system.

关键词： Cohesive zone element intergranular cracking polycrystalline material intermetallic compound(IMC)

Synthesis of Novel Chiral 7-Amide Substituted-4-androstene-3,17-dione Derivatives

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Chemical Research in Chinese Universities 2011年第4期27卷 604-609页

作者： CHEN Shao-rui ZHOU Xue-qin LI Wei LIU Dong-zhi School of Chemical Engineering and Technology Tianjin University Tianjin 300072 P. R. China College of Science Hebei University of Science and Technology Shijiazhuang 050018 P. R. China

A series of novel 7-amide substituted-4-androstene-3,17-dione derivatives（8αa ＂8αh or 8βa ＂8βh） was synthesized from the important intermediates 5 by N-acylation and acidic *** 5α and 5β were obtained through the reaction sequence including acetalization,allylic oxidation,oximation and *** structures of the target compounds were characterized by MS,1H NMR,13C NMR and HRMS spectra and their stereo configurations were identified through DEPT（distortionless enhancement by polarization transfer）,HMQC（hetero-nuclear multiple quantum coherence） and NOE（nuclear overhauser effect） correlation.

关键词： Androstenedione Allylic oxidation Reduction N-Acylation