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Vanadium(V) Complexes Containing Unsymmetrical N-Heterocyclic Carbene Ligands: Highly Efficient Synthesis and Catalytic Behavior towards Ethylene/Propylene Copolymerization

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Chinese Journal of Polymer Science 2024年第1期42卷 32-41,I0006页

作者： yi-Cong Wang hui Zhat Pei-yi Cheng Shu Zhang Xiang-Wei liu yi-Xian Wu State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBejing 100029China

The highly efficient method has been developed for the synthesis of NHC·VOCl_(3) containing symmetrical or unsymmetrical Nheterocyclic carbene(NHC) ligands by the transmetallation reaction of NHC·AgCl with VOCl_(3).The total isolated yield of VOCl_(3)[1,3-(2,4,6-Me_(3)C_(6)H_(2))_(2)(NCH=)_(2)C:](V4') reached 86% by transmetallation reaction,which is much higher than that(48%) by direct coordination *** methodology has also been used to synthesize the novel vanadium complexes containing unsymmetrical NHC ligands of VOCl_(3)[PhCH_(2)NCH=CHNR)C:](V5',R=2,4,6-Me_(3)C_(6)H_(2);V6',R=2,4-Me_(2)-6-Ph-C_(6)H_(2);V7',R=2,6-^(i)Pr_(2)-C_(6)H_(3)) with high yield,which could not be obtained by direct coordination *** catalytic activity and copolymerization ability would be improved by introducing unsymmetrical NHC ligands due to their less steric bulky *** vanadium complex V5' containing unsymmetrical NHC ligand exhibits higher catalytic activity(3.7×10^(5)g_(copolymer)·mol^(-1) of V·h^(-1)) than that of V4' containing symmetrical NHC ***,the higher propylene incorporation ratio(45.6 mol%) in the copolymers of ethylene with propylene could be obtained by using V5' than that(39.9%) by using V4'.The results would provide a highly efficient strategy for the synthesis of early transition metal complexes containing versitile NHC ligands,affording the catalyst with both high catalytic activity and copolymerization ability for the synthesis of high performance polyolefin elastomers.

关键词： Vanadium complex N-heterocyclic carbene ligand Transmetallation reaction Copolymerization of ethylene with propylene

Using highly concentrated chloride solutions to leach valuable metals from cathode-active materials in spent lithium-ion batteries

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Rare Metals 2021年第7期40卷 1971-1978页

作者： Ai-Fei yi Zhao-Wu Zhu Ya-hui liu Jian Zhang hui Su Tao Qi National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemistry and Chemical Engineering University of Chinese Academy of SciencesBeijing 101407China

This study focused on the extraction of valuable metals from the cathode-active materials in spent lithiumion batteries using a high-concentration chloride *** effects of the concentrations of ammonium chloride(NH4 Cl),hydrochloric acid(HCl),and reductants such as hydrogen peroxide(H_(2)O_(2))and urea(CO(NH_(2))_(2))on metal extraction and chlorine production were studied *** leaching mechanism was analyzed,and a leaching model was *** was found that the addition of solid NH4 Cl to an HCl solution significantly improved the metal extraction capability of the latter and reduced the formation of chlorine gas by 96.0%compared to that only using *** activation energies for leaching Li,Ni,Co,and Mn were determined to be 30.4,38.5,30.6,and 38.2 kJ·mol^(-1),*** study demonstrates an environmentally friendly method for recycling metal resources from cathode-active materials and furthers understanding of how NH4 Cl inhibits chlorine production when leaching with mixed solutions of HCl and NH4 Cl.

关键词： Lithium-ion batteries Hydrochloric acid Ammonium chloride Chlorine gas

基于DCGAN数据增强的樱桃番茄可溶性固形物含量光谱检测方法

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食品科学 2025年第2期46卷 214-221页

作者：吴至境刘富强李志刚陈慧华东交通大学机电与车辆工程学院江西南昌330013

针对樱桃番茄在实际检测中样品数不足的特点,本研究提出一种深度卷积生成对抗网络(deep convolutional generative adversarial network,DCGAN)模型以同时扩充光谱数据及可溶性固形物含量(soluble solids content,SSC)标签数据,并建立... 详细信息

针对樱桃番茄在实际检测中样品数不足的特点,本研究提出一种深度卷积生成对抗网络(deep convolutional generative adversarial network,DCGAN)模型以同时扩充光谱数据及可溶性固形物含量(soluble solids content,SSC)标签数据,并建立一维卷积神经网络回归(one dimensional-convolutional neural networks regression,1D-CNNR)模型以提高模型的预测精度和泛化能力。为了比较,分别建立偏最小二乘回归(partial least squares regression,PLSR)模型和支持向量机回归(support vector regression,SVR)模型。将原始80个样品数据集、1000个样品的DCGAN扩充数据集和1080个样品的合并数据集,分别结合1D-CNNR、SVR及PLSR进行建模与预测。为了进一步验证模型的泛化能力,一批新的总数为40个样品的樱桃番茄数据作为上述3个模型的新测试集。结果显示,使用合并数据集划分所得校正集进行1D-CNNR建模后,模型为最优的SSC回归检测模型。此时1D-CNNR面向合并样品测试集的预测准确率最高,预测相关系数rp=0.9807,均方根误差RMSE_(p)=0.1929;与SVR与PLSR对比,1D-CNNR面向新的40个样品数据集的预测准确率也最高,其rp=0.9638,RMSE_(p)=0.2245。本研究可为有效准确检测樱桃番茄的可溶性固形物含量提供一种新思路。

关键词：樱桃番茄可溶性固形物含量可见-近红外漫反射光谱深度卷积生成对抗网络一维卷积神经网络

A novel mechanism of painful signal processing:Propagation failure of unmyelinated fibers in diabetic neuropathy rats

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A novel mechanism of painful signal processing:Propagation f...

Regeneration of spent LiFePO4 as a high-performance cathode material by a simultaneous coating and doping strategy

中国神经科学学会第四次会员代表大会暨第八届全国学术会议

作者： Xiu-Chao WANG~1,Wei SUN~1,Bei MIAO~(1,2),Wen-Ting WANG~1,Ceng LUO~1,yi-hui liu~1,Fang KUANG~1,Jun-Ling XING~1, hui XU~1,Gong JU~1,Xue-Jun SONG~2,San-Jue HU~(1,*) 1 Institute of Neuroscience,the Fourth Military Medical University,Xi’an 710033,China 2 Jiangsu Province Key Laboratory of Anesthesiology,Xuzhou Medical College,Xuzhou 221002,China

Objective The precise mechanism of painful diabetic neuropathy(PDN) in unmyelinated fibers(C-fibers) remains unclear despite of the finding of hyper-responsivity in some subset of *** previous work found that conduction failures(CF) of main axon in C-fibers are one of adaptation phenomenon and information processing in peripheral *** present study is to investigate the roles of CF and it’s mechanisms in *** Streptozotocin (STZ,70mg/kg) diabetic model was induced with SD male *** injecting STZ 3-4 weeks,the behavioral responses to mechanical and heat stimulations were tested to the appearance of diabetic neuropathy *** single C fibers discharge was induced by mechanical and electrical stimulations for testing the changes of CF degree in C fibers within the coccygeal *** cell patch clamp recording in whole dorsal root ganglion(DRG) neurons was used to explore the excitability change and the intensity of sodium current in *** channel expression alterations were tested in DRG and C fibers of coccygeal nerve in control and NPD ***(1) A rat model of PDN induced by STZ has been set up. (2) The discharge numbers of single C-fiber in PDN were significantly higher than the control group in mechanical stimulations(100 g).High frequency firing(>3Hz) was found in about 1/3 of C-fibers in *** degree of PDN was distinctly lower than that of control ***,low dose TTX(100nM) could increase CF degree in partial PDN.(3) The threshold of action potential in PDN was lower than control *** its half width of action potential also was faster than control.(4) Sodium current of PDN was larger than control group.(5) Immunochemistry data showed that the numbers of Nav 1.7 cell,Nav 1.8 and Nav 1.9 in PDN were higher than *** the fluorescence intensities of Nav 1.7, Nav 1.8 and Nav1.9 in PDN also increased in coccygeal *** The results demonstrat that CF of the axon of C fibers is weakened during P

关键词： conduction failure unmyelinated fibers persistent sodium channel diabetic painful neuropathy dorsal root ganglion

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International Journal of Minerals,Metallurgy and Materials 2023年第6期30卷 1162-1170页

作者： hui Tong yi Li Gaoqiang Mao Chaolei Wang Wanjing Yu Yong liu Mudan liu School of Metallurgy and Environment Central South UniversityChangsha 410083China Guangdong Provincial Key Laboratory of Development and Comprehensive Utilization of Mineral Resources Guangzhou 510560China National&Regional Joint Engineering Research Center of Nonferrous Metal Resource Recycling Changsha 410083China Engineering Research Center of the Ministry of Education for Advanced Battery Materials Central South UniversityChangsha 410083China Institute of Resources Utilization and Rare Earth Development Guangdong Academy of SciencesGuangzhou 510560China

With the number of decommissioned electric vehicles increasing annually,a large amount of discarded power battery cathode material is in urgent need of ***,common leaching methods for recovering metal salts are economically inefficient and ***,the recycled material obtained by lithium remediation alone has limited performance in cycling ***,a short method of solid-phase reduction is developed to recover spent LiFePO4 by simultaneously introducing Mg2+ions for hetero-atom *** of particle agglomeration,carbon layer breakage,lithium loss,and Fe3+defects in spent LiFePO4 are also *** show that Mg2+addition during regeneration can remarkably enhance the crystal structure stability and improve the Li+diffusion *** regenerated LiFePO4 exhibits significantly improved electrochemical performance with a specific discharge capacity of 143.2 mAh·g^(−1)at 0.2 C,and its capacity retention is extremely increased from 37.9%to 98.5%over 200 cycles at 1 ***,its discharge capacity can reach 95.5 mAh·g^(−1)at 10 C,which is higher than that of spent LiFePO4(55.9 mAh·g^(−1)).All these results show that the proposed regeneration strategy of simultaneous carbon coating and Mg2+doping is suitable for the efficient treatment of spent LiFePO4.

关键词： spent LiFePO4 solid-phase reduction repair and regeneration cathode materials lithium-ion batteries

Flame-retardant and antibacterial flexible polyurethane foams with high resilience based on a P/N/Si-containing system

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Journal of Materials Science & Technology 2024年第15期182卷 141-151页

作者： Ping Li hui liu ying-Jun Xu De-yi Wang Yun liu Ping Zhu College of Textiles&Clothing Institute of Functional Textiles and Advanced MaterialsNational Engineering Research Center for Advanced Fire-Safety Materials D&A(Shandong)Qingdao Key Laboratory of Flame Retardant Textile MaterialsState Key Laboratory of Bio-Fibers and Eco-TextilesQingdao UniversityQingdao 266071China IMDEA Materials Institute C/Eric Kandel 2GetafeMadrid 28906Spain

In this work,the coatings used phosphorylated chitosan(PCS)and GP-108 via the dip-coating method presented exceptional flame retardancy and antibacterial properties for flexible polyurethane foams(FPUF).PCS/GP@FPUF with 35%weight gain of PCS/GP can receive the UL-94 V-0 rating and obtain a 32%reduction of peak heat release rate value compared with that of FPUF,and it remains relatively dense char *** effective heat of combustion of PCS/GP@FPUF is 21.6 kJ/g,presenting a 22%decrease compared with that of ***,the PCS/GP coatings mainly have the condensed-phase flame-retardant mechanism associated with the analysis of char residues and the volatile products released through the thermal degradation process.X-ray photoelectron spectroscopy results confirm that the char residues of PCS/GP@FPUF consist of highly-graphitized carbon and it formed P-N-Si synergistic char *** addition,the antibacterial rates of PCS/GP@FPUF against Escherichia coli(***)and Staphylococcus aureus(***)are 99.99%,and the incorporation of GP-108 does not influence the antibacterial proper-ties of ***,the resiliency of FPUFs has been slightly ***,the flame-retardant and antibacterial FPUFs with wonderful resiliency are hopeful to be applied as filler materials for vehicle seats and obtain longer service lives.

关键词： Environmental organic-inorganic coatings FPUF Flame retardancy Antibacterial properties

Efficient and green tetrahydropyranylation and deprotection of alcohols and phenols by using activated carbon supported sulfuric acid

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Chinese Chemical Letters 2008年第8期19卷 893-896页

作者： Jin hui Yang Xuan Zhang Wan yi liu Key Laboratory of Energy Sources ＆ Engineering Ningxia University Yinchuan 750021 China School of Chemistry and Chemical Engineering Ningxia University Yinchuan 750021 China

A simple, green and efficient method for the DHP protection of various alcohols and phenols and the subsequent removal of the corresponding protective group in the presence of a catalytic amount of the activated carbo... 详细信息

关键词： Tetrahydropyranylation Deprotection THP ethers Activated carbon

Interconnections between diabetic corneal neuropathy and diabetic retinopathy:diagnostic and therapeutic implications

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Neural Regeneration Research 2025年第8期20卷 2169-2180页

作者： Mingyi Yu Faith Teo En Ning Chang liu Yu-Chi liu Tissue Engineering and Stem Cell Group Singapore Eye Research InstituteSingapore Yong Loo Lin School of Medicine National University of SingaporeSingapore Department of Cornea and External Eye Disease Singapore National Eye CenterSingapore Ophthalmology and Visual Sciences Academic Clinical Program Duke-NUS Medical SchoolSingapore

Diabetic corneal neuropathy and diabetic retinopathy are ocular complications occurring in the context of diabetes *** corneal neuropathy refers to the progressive damage of corneal *** retinopathy has traditionally been considered as damage to the retinal ***,growing evidence suggests that diabetic retinopathy is a complex neurovascular disorder resulting from dysfunction of the neurovascular unit,which includes both the retinal vascular structures and neural *** retinopathy is one of the leading causes of blindness and is frequently screened for as part of diabetic ocular ***,diabetic corneal neuropathy is commonly overlooked and underdiagnosed,leading to severe ocular surface *** studies have found that these two conditions tend to occur together,and they share similarities in their pathogenesis pathways,being triggered by a status of chronic *** review aims to discuss the interconnection between diabetic corneal neuropathy and diabetic retinopathy,whether diabetic corneal neuropathy precedes diabetic retinopathy,as well as the relation between the stage of diabetic retinopathy and the severity of corneal *** also endeavor to explore the relevance of a corneal screening in diabetic eyes and the possibility of using corneal nerve measurements to monitor the progression of diabetic retinopathy.

关键词： cornea corneal nerves diabetes diabetic corneal neuropathy diabetic retinopathy retina

Monte Carlo Study of Planar Rotator Model with Weak Dzyaloshinsky-Moriya Interaction

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Communications in Theoretical Physics 2006年第4X期46卷 663-667页

作者： SUN Yun-Zhou liu hui-Ping yi Lin Department of Physics and State Key Laboratory of Laser Technology~ Huazhong University of Science and Technology Wuhan 430074 China

With the help of an improvement Monte Carlo method, the Berezinskii-Kosterlitz-Thouless phase transition arising in two-dimensional planar rotator model with weak Dzyaloshinsky-Moriya （DM） interaction is investigated. The effects of the DM interaction on specific heat, susceptibility, and magnetization are simulated. The critical temperature of transitions is determined by the so-called Binder cumulant and the susceptibility of finite-size scaling. We find that the chiral Z2 symmetry reduced by the DM interactions plays an important role in a two-dimensional XY spin system, typically, the critical temperature is sensitive to weak DM spin couplings.

关键词： Monte Carlo method Berezinskii-Kosterlitz-Thouless phase transition Dzyaloshinsky-Moriya interaction XY model