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碱性介质中腐植酸电化学氧化动力学研究

现代化工 2025年第1期45卷 207-213页

作者：冯晴晴何德民范玉强关珺大连理工大学化工学院辽宁大连116024

采用三电极体系的H型隔膜电解池对腐植酸(humic acid,HA)在碱性条件下的电化学氧化过程进行动力学研究,考察了温度、阳极电位、碱液质量浓度对电化学氧化反应的影响。结果表明,HA电化学氧化符合二级反应动力学模型,活化能为19.94 kJ/mol... 详细信息

采用三电极体系的H型隔膜电解池对腐植酸(humic acid,HA)在碱性条件下的电化学氧化过程进行动力学研究,考察了温度、阳极电位、碱液质量浓度对电化学氧化反应的影响。结果表明,HA电化学氧化符合二级反应动力学模型,活化能为19.94 kJ/mol,各反应条件对HA进一步氧化成高附加值的煤酸(CA)有不同程度的影响。对各反应条件下的氧化过程进行分析发现,温度影响分子间键能和双电层充放电速率;阳极电位影响相应的电流密度,进而影响电子转移效率;碱液质量浓度改变溶液的电导性。HA电化学氧化后分子结构发生改变,可为进一步研究煤电化学氧化这一复杂反应提供参考。

关键词：腐植酸碱性电化学氧化动力学反应条件

Deciphering the molecular mechanisms of Simiaowan in the treatment of hyperuricemia: in vivo and in silico approaches

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Traditional Medicine Research 2025年第2期10卷 37-54页

作者： Yong-Chang Zeng jun-Hong Wu Dan-Dan Xu Kang He Chang-qing Liu Li-Fei Song Zheng-Zhi Wu Qian-Qian Jiang Shao-Yu Liang Department of Neurology The First Affiliated Hospital of Shenzhen UniversityShenzhen 518020China Pharmaceutical Department The Affiliated TCM Hospital of Guangzhou Medical UniversityGuangzhou 510000China School of Pharmacy Guizhou University of Traditional Chinese MedicineGuiyang 550025China Guangzhou Zeli Medical Technology Co. Ltd.Guangzhou 510700China

Background:Simiaowan(SMW),a well-known traditional Chinese medicine,has been employed to treat hyperuricemia(HUA)and gout for ***,the bioactive components and underlying mechanisms have not been *** objective of this study was to identify the active components and potential mechanisms of SMW by integrating pharmacological experimentation,serum pharmacochemistry,network pharmacology and molecular ***:HUA rats modelling by high-fat/high-sugar diet and potassium oxonate/adenine oral administration were used to evaluate the pharmacodynamic effects of ***-Q-Exactive-MS/MS was employed to detect the bioactive components present in SMW-containing *** pharmacology and molecular docking were utilized to elucidate the potential targets and underlying ***:SMW effectively ameliorated HUA rats via the inhibition of uric acid(UA)production,promotion of UA excretion,improvement of lipid and glucose metabolic abnormalities,antioxidant,anti-inflammatory and anti-insulin resistance effects.A total of 73 compounds detected in SMW-containing serum were identified as potential active components,with alkaloids,flavonoids,organic acids,and terpenoids emerging as the primary active *** 203 corresponding targets were obtained as SMW anti-HUA/gout targets,which mainly participated in apoptosis,insulin resistance,TNF,PI3K-Akt,HIF-1,NF-κB,MAPK,IL-17 and TLR signaling *** docking indicated that active compounds(***,phellodendrine,quercetin,formononetin,ferulic acid)had superior binding abilities to the key targets(*** carrier family 22 member 12(URAT1),solute carrier family 22 member 6(OAT1),ATP-binding cassette sub-family G member 2(ABCG2),solute carrier family 2,facilitated glucose transporter member 9(GLUT9),xanthine dehydrogenase/oxidase(XDH),transcription factor p65(RELA),toll-like receptor 4(TLR4),prostaglandin G/H synthase 2(PTGS2),caspase-3(CASP3),insulin(INS)).Conclusion:S

关键词： hyperuricemia network pharmacology serum pharmacochemistry Simiaowan UPLC-Q-Exactive-MS/MS

Dynamical properties of the Haldane chain with bond disorder

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Frontiers of physics 2022年第3期17卷 43-51页

作者： Jing-Kai Fang jun-Han Huang Han-qing Wu Dao-Xin yao Center for Neutron Science and Technology School of PhysicsSun Yat-sen UniversityGuangzhou 510275China State Key Laboratory of Optoelectronic Materials and Technologies School of PhysicsSun Yat-sen UniversityGuangzhou 510275China

By using Lanczos exact diagonalization and quantum Monte Carlo combined with stochastic analytic continuation,we study the dynamical properties of the S=1 antiferromagnetic Heisenberg chain with different strengths of bond *** the weak disorder region,we find weakly coupled bonds which can induce additional low-energy excitation below the one-magnon *** the disorder increases,the average Haldane gap closes at δ_(∆)~0.5 with more and more low-energy excitations coming *** the critical disorder strength δ_(C)~1,the system reaches a random-singlet phase with prominent sharp peak atω=0 and broad continuum atω>0 of the dynamic spin structure *** addition,we analyze the distribution of random spin domains and numerically find three kinds of domains hosting effective spin-1/2 quanta or spin-1 sites in ***“spins”can form the weakly coupled longrange singlets due to quantum fluctuation which contribute to the sharp peak atω=0.

关键词： Haldane chain Heisenberg model magnetic excitation quantum phase transition random singlet disorder exact diagonalization quantum Monte Carlo

Existence,Multiplicity and Infinite Solvability of Positive Solutions for One-Dimensional p-Laplacian

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Acta Mathematica Sinica,English Series 2005年第4期21卷 691-698页

作者： qing Liu yao Department of Applied Mathematics Nanjing University of Finance and Economics Nanjing 210003 P. R. China

The existence, multiplicity and infinite solvability of positive solutions are established for some two-point boundary value problems of one-dimensional p-Laplacian. In this paper, by multiplicity we mean the existenc... 详细信息

关键词： One-dimensional p-Laplacian Positive solution Existence Multiplicity Infinite solvability

Triple Positive Periodic Solutions of Nonlinear Singular Second-order Boundary Value Problems

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Acta Mathematica Sinica,English Series 2014年第2期30卷 361-370页

作者： qing Liu yao Department of Applied Mathematics Nanjing University of Finance and Economics

This paper studies the positive solutions of the nonlinear second-order periodic boundary value problem u″（t）＋ λ（t）u（t） = f（t,u（t））,a.e.t ∈ [0,2π],u（0） = u（2π）,u′（0） = u′（2π）,where f（t,u） is a local Carath′eodory *** shows that the problem is singular with respect to both the time variable t and space variable *** applying the Leggett-Williams and Krasnosel＇skii fixed point theorems on cones,an existence theorem of triple positive solutions is *** order to use these theorems,the exact a priori estimations for the bound of solution are given,and some proper height functions are introduced by the estimations.

关键词： Periodic boundary value problem singular nonlinearity triple positive solutions fixedpoint theorem

Theoretical and experimental study on the inhibition of jet fuel oxidation by diarylamine

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Chinese Journal of Chemical Engineering 2023年第4期56卷 225-232页

作者： Tinghao Jia Yunbo Yu qing Liu yao Yang Ji-jun Zou Xiangwen Zhang Lun Pan Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang UniversityHangzhou 311200China Key Laboratory for Green Chemical Technology of the Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China

Antioxidants addition is believed as a facile and effective way to improve jet fuel thermal oxidation ***,amine antioxidants,as one of the most important antioxidants,have not received sufficient attention in the field of jet fuel autoxidation ***,the inhibition efficiency and mechanism of decane and exo-tetrahydrodicyclopentadiene(THDCPD)oxidation by di-4-tert-butylphenylamine(diarylamine)was experimentally and theoretically *** results show that diarylamine can significantly inhibit decane oxidation but is less efficient for THDCPD oxidation,which is attributed to the higher energy barrier of retro-carbonyl-ene reaction(rate-determining step)in THDCPD than that in decane during diarylamine ***,the addition of diarylamine will cause undesirable color change after accelerated oxidation and produce slightly more deposits during high-temperature thermal oxidative stress for both decane and *** results provide significant implications for the future design of effective antioxidant additives for high-performance jet fuel.

关键词： Jet fuel Thermal oxidation stability High-energy-density fuel Diarylamine Antioxidation mechanism

Automated Counting of Rice Planthoppers in Paddy Fields Based on Image Processing

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Journal of Integrative Agriculture 2014年第8期13卷 1736-1745页

作者： yao qing XIAN Ding-xiang LIU qing-jie YANG Bao-jun DIAO Guang-qiang TANG Jian School of Information Science and Technology Zhejiang Sci-Tech University State Key Laboratory of Rice Biology China National Rice Research Institute

A quantitative survey of rice planthoppers in paddy fields is important to assess the population density and make forecasting decisions. Manual rice planthopper survey methods in paddy fields are time-consuming, fatiguing and tedious. This paper describes a handheld device for easily capturing planthopper images on rice stems and an automatic method for counting rice planthoppers based on image processing. The handheld device consists of a digital camera with WiFi, a smartphone and an extrendable pole. The surveyor can use the smartphone to control the camera, which is fixed on the front of the pole by WiFi, and to photograph planthoppers on rice stems. For the counting of planthoppers on rice stems, we adopt three layers of detection that involve the following：（a） the first layer of detection is an AdaBoost classifier based on Haar features;（b） the second layer of detection is a support vector machine（SVM） classifier based on histogram of oriented gradient（HOG） features;（c） the third layer of detection is the threshold judgment of the three features. We use this method to detect and count whiteback planthoppers（Sogatella furcifera） on rice plant images and achieve an 85.2% detection rate and a 9.6% false detection rate. The method is easy, rapid and accurate for the assessment of the population density of rice planthoppers in paddy fields.

关键词： insect counting rice planthoppers handheld device AdaBoost classifier SVM classifier image features

Thermal Behavior and Kinetics of Raw/Pyrolytic Wood and Coal Blends during Co-combustion Process

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Journal of Iron and Steel Research(International) 2016年第9期23卷 917-923页

作者： Jian DING qing-cai LIU Li-jun JIANG Guo-qing LIU Shan REN Jian YANG Lu yao Fei MENG College of Materials Science and Engineering Chongqing University

The thermal properties of raw wood（RW） biomass,corresponding pyrolytic wood（PW）biomass,and their blends with anthracite coal（AC） were evaluated under combustion conditions with a thermogravimetric analysis（TGA）*** blending ratios of the biomass with AC ranging from 0 to 100 mass% were taken into consideration to investigate the thermal behavior and kinetics of these blends during their *** blends with different ratios of the RW to AC and 100% AC（100AC）,two distinct mass loss peaks related to the release or combustion process of the volatiles and the combustion of the char were *** addition of a higher ratio of RW or PW into AC can improve the combustion process of the *** thermal behavior of the RW/AC or PW/AC blends could not be characterized by a simple linear correlation of their pure material thermal *** the RW/PW addition ratios varying from 25 mass% to 80 mass%,the apparent activation energy of the blends gradually decreased from 48.46 to 34.93 kJ/mol and from 82.74 to 37.81 kJ/mol for the RW/AC and PW/AC blends,respectively,with high correlation coefficient（R2） values ranging from 0.995 6 to 0.998 4.

关键词： thermal property thermogravimetric analysis raw wood biomass pyrolytic wood biomass apparent activation energy

A Novel PLL Structure for Dynamic Stability Improvement of DFIG-based Wind Energy Generation Systems During Asymmetric LVRT

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Journal of Modern Power Systems and Clean Energy 2023年第4期11卷 1149-1164页

作者： Lei Guan jun yao State Key Laboratory of Power Transmission Equipment&System Security and New Technology School of Electrical EngineeringChongqing UniversityChongqing 400044China

The dynamic coupling effect,which is introduced by the dual-sequence phase-locked loops(PLLs)used in doublyfed induction generator(DFIG)based wind energy generation systems(WEGSs)during asymmetric low voltage ride-through(LVRT)in weak grid,needs *** order to study this new dynamic coupling effect,an equivalent two-degree-of-freedom(2-DOF)spring damper particle model is used in this paper to develop a small-signal model for the dual-sequence *** dynamic interaction between the positive-sequence(PS)and negative-sequence(NS)PLLs is ***,the impact of the dynamic coupling between the dual-sequence PLLs on the dynamic stability during the steady-state stage of an asymmetric fault is *** analysis results show that the dynamic coupling between the dual-sequence PLLs will cause drift in the frequency and damping for the PS and NS PLL *** will change the instability modal of the system and introduce the risk of dynamic ***,the effectiveness of existing control strategies for enhancing the dynamic stability will be ***,a novel PLL structure is designed to improve the dynamic stability of the system during the steady-state stage of an asymmetric *** effectiveness of the proposed strategy is verified by simulations and experiments.

关键词： Doubly-fed induction generator(DFIG) phaselocked loop(PLL) dynamic stability dynamic coupling weak grid asymmetric low-voltage ride through(LVRT)