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Chinese Chemical Letters 2024年第5期35卷 392-396页

作者： Guorong Li Yijing Wu Chao Zhong yixin yang Zian Lin Ministry of Education Key Laboratory of Analytical Science for Food Safety and Biology Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food SafetyCollege of ChemistryFuzhou UniversityFuzhou 350108China

Targeted construction of new covalent organic frameworks(COFs)with specific purposes and rationalities to build colorimetric assay platform for environmental pollutant monitoring have attracted increasing ***,it is still challenging due to lack of available coordination sites inside COFs pores and only a slight bonding ability for anchoring *** this work,a two-dimensional(2D)COFs(termed as Tz-COF)with high crystallinity,excellent chemical stability,and abundant sulfur coordination in its skeletons was synthesized and used for the confined growth of Au *** was found that the Au NPs showed significant dispersibility for the support of *** proposed Tz-COF@Au NPs possessed outstanding Hg^(2+)-activated peroxidase-like activity benefited from physicochemical properties of gold amalgam and synergistic effect between COFs and Au NPs to oxidize chromogenic *** on highly efficient activity and distinctive color evolution,the strategy for detecting Hg^(2+)was developed and successfully applied to determine the content of Hg^(2+)in real environmental *** work manifests that a potential strategy to establish a colorimetric assay platform for environmental pollutant monitoring based on the targeted manufacturing of novel COFs with specific functions.

关键词： Covalent organic frameworks Thiazole Sulfur coordination Au nanoparticles Hg^(2+)-activated peroxidase-like activity

Molecular-scale co-assembly membranes derived from keplerate cluster:carbonic anhydrase-mimicking nanocapsules for enhanced CO_(2)/N_(2)separation

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Science China Chemistry 2024年第10期67卷 3271-3282页

作者： Wan-Lei Zhao Hongqiang Li Ruoxuan Zheng yixin yang Wei Chen Yu-Fei Song State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China Quzhou Institute for Innovation in Resource Chemical Engineering Quzhou 324000China

The development of CO_(2)separation membranes with high permeability and high selectivity,as well as ultra-thin selective layers,has always been ***,a molecular-scaled co-assembly strategy is employed to fabricate the Pebax-Mo_(132)(Pebax=polyether-block-amide copolymer;Mo_(132)=(NH_(4))_(42)[Mo_(72)^(Ⅵ)Mo_(60)^(Ⅴ)O_(372)(CH_(3)COO)_(30)(H_(2)O)_(72)])*** optimal selfstanding membrane,Pebax-Mo_(132)-5%,shows a CO_(2)permeability of~384 Barrer and an ultra-high ideal CO_(2)/N_(2)selectivity of~244,outperforming most membranes reported in the *** CO_(2)permeability and ideal CO_(2)/N_(2)selectivity are increased by 70%and 367%,respectively,compared with the pristine Pebax membrane.A thin-film composite membrane prepared by spin-coating technique on a support membrane with gutter layers also exhibits a CO_(2)permeance of 838 GPU and a CO_(2)/N_(2)selectivity of *** excellent performance can be attributed to the following reasons:(1)strong hydrogen bonding interactions between{Mo_(132)}clusters and Pebax confer excellent interfacial compatibility to the mixed matrix membranes;(2)incorporation of hollow{Mo_(132)}clusters into the Pebax molecular chain decreases the crystallinity of Pebax,and thereby accelerates the chain dynamics and increases the free volume of the membrane;(3)in situ diffuse reflectance infrared Fouriertransform spectroscopy demonstrates that the{Mo_(132)}clusters can effectively catalyze the hydration reaction of CO_(2)and promote the transport of CO_(2);(4)furthermore,the 0.35 nm pores of the crown ether-type{Mo_(9)O_(9)}allow the accurate size sieving of CO_(2)(0.33 nm)and N_(2)(0.36 nm)molecules.

关键词： polyoxometalates molecular-scale assembly CO_(2)capture mixed matrix membranes

Effect of kerosene injection states on mixing and combustion characteristics in a cavity-based supersonic combustor

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Chinese Journal of Aeronautics 2024年第4期37卷 308-320页

作者： Xu LIU Peibo LI Fei LI Hongbo WANG Mingbo SUN Chao WANG yixin yang Dapeng XIONG Yanan WANG Science and Technology on Scramjet Laboratory College of Aerospace Science and EngineeringNational University of Defense TechnologyChangsha 410073China

It has been found that the static pressure distribution along the axial direction of liquid kerosene is lower than that of the gaseous kerosene under the same flow condition and overall equivalent ratio from previous *** further investigate this phenomenon,a compressible two-phase parallel simulation method is utilized to analyze the mixing and combustion characteristics of gaseous and liquid kerosene jets in a cavity-based supersonic *** numerical results are consistent with the experiments and demonstrate that gaseous injection leads to a cavity shear layer that dives deeper into the cavity,forming two recirculation zones in the front and rear of the *** contrast,the cavity shear layer is closer to the mainstream during liquid injection,and only a large recirculation zone is formed in the rear of the *** a result of the cavity shear layer and the recirculating flow,the fuel vapor of gaseous injection accumulates in the front of the cavity,while for the liquid injection,the fuel vapor disperses in the cavity,cavity shear layer,and the region above,and the rear of the cavity has a higher fuel vapor concentration than the *** unique fuel distribution causes the combustion area to be concentrated in the cavity during the gaseous injection but dispersed inside and downstream of the cavity during the liquid *** a result,forming a thermal throat under the same conditions is more challenging during liquid injection,and the generated static pressure distribution is lower than that during the gaseous injection.

关键词： Gaseous injection Liquid injection Mixing process Combustion Supersonic flow

Molecular-scale co-assembly membranes derived from keplerate cluster:carbonic anhydrase-mimicking nanocapsules for enhanced CO/Nseparation

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Science China Chemistry 2024年

作者： Wanlei Zhao Hongqiang Li Ruoxuan Zheng yixin yang Wei Chen Yufei Song State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Quzhou Institute for Innovation in Resource Chemical Engineering

The development of CO2separation membranes with high permeability and high selectivity,as well as ultra-thin selective layers,has always been ***,a molecular-scaled co-assembly strategy is employed to fabricate the Pebax-Mo132(Pebax=polyether-block-amide copolymer;Mo132=（NH4）42[Mo72VIMo60VO372（CH3COO）30（H2O）72]) *** optimal selfstanding membrane,Pebax-Mo132-5%,shows a CO2permeability of～384 Barrer and an ultra-high ideal CO2/N2selectivity of～244,outperforming most membranes reported in the *** CO2permeability and ideal CO2/N2selectivity are increased by 70%and 367%,respectively,compared with the pristine Pebax membrane.A thin-film composite membrane prepared by spin-coating technique on a support membrane with gutter layers also exhibits a CO2permeance of 838 GPU and a CO2/N2selectivity of *** excellent performance can be attributed to the following reasons:（1） strong hydrogen bonding interactions between{Mo132}clusters and Pebax confer excellent interfacial compatibility to the mixed matrix membranes;（2）incorporation of hollow{Mo132}clusters into the Pebax molecular chain decreases the crystallinity of Pebax,and thereby accelerates the chain dynamics and increases the free volume of the membrane;（3） in situ diffuse reflectance infrared Fouriertransform spectroscopy demonstrates that the{Mo132}clusters can effectively catalyze the hydration reaction of CO2and promote the transport of CO2;（4） furthermore,the 0.35 nm pores of the crown ether-type{Mo9O9}allow the accurate size sieving of CO2（0.33 nm） and N2（0.36 nm） molecules.

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Precise gradient separation of nanoparticles using reduced graphene oxide-polyoxomolybdate membranes

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Science China Chemistry 2024年

作者： yixin yang Wanlei Zhao Ruoxuan Zheng Hongqiang Li Wei Chen Yufei Song State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Quzhou Institute for Innovation in Resource Chemical Engineering

The purification and size sieving of nanoparticles（NPs） represents a significant scientific ***,the rGOpolyoxometalates(POMs=PMo12,Mo132and Mo368) membranes were fabricated successfully via a simple and scalable POMsassisted in-situ photoreduction *** the mass ratio of rGO to PMo12was 1:30,the resultant rGO-PMo12membranes with highly ordered and uniform nanochannels of 1.0 nm can be obtained,which showed an accurate carbon quantum dots（CQDs） separation with a cut-off size approximately 1.0 *** increase of the size of the interlayered POMs from PMo12（1.0 nm）,{Mo132}（2.9 nm） to {Mo368}（3.8 nm）,the resultant rGO-PMo12,rGO-Mo132and rGO-Mo368exhibited precise gradient separation of CQDs and Au nanoparticles by size exclusion *** results pave a promising way to construct new twodimensional（2 D） membranes for highly efficient size-selective separation.

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Hypidone hydrochloride(YL-0919)ameliorates functional deficits after traumatic brain injury in mice by activating the sigma-1 receptor for antioxidation

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Neural Regeneration Research 2025年第8期20卷 2325-2336页

作者： Yafan Bai Hui Ma Yue Zhang Jinfeng Li Xiaojuan Hou yixin yang Guyan Wang Yunfeng Li Department of Anesthesiology Beijing Tongren HospitalCapital Medical UniversityBeijingChina Beijing Institute of Basic Medical Sciences BeijingChina Hebei North University ZhangjiakouHebei ProvinceChina Beijing Institute of Pharmacology and Toxicology State Key Laboratory of Toxicology and Medical CountermeasuresBeijing Key Laboratory of NeuropsychopharmacologyBeijingChina

Traumatic brain injury involves complex pathophysiological mechanisms,among which oxidative stress significantly contributes to the occurrence of secondary *** this study,we evaluated hypidone hydrochloride(YL-0919),a self-developed antidepressant with selective sigma-1 receptor agonist properties,and its associated mechanisms and targets in traumatic brain *** experiments to assess functional deficits were followed by assessment of neuronal damage through histological analyses and examination of blood-brain barrier permeability and brain ***,we investigated the antioxidative effects of YL-0919 by assessing the levels of traditional markers of oxidative stress in vivo in mice and in vitro in HT22 ***,the targeted action of YL-0919 was verified by employing a sigma-1 receptor antagonist(BD-1047).Our findings demonstrated that YL-0919 markedly improved deficits in motor function and spatial cognition on day 3 post traumatic brain injury,while also decreasing neuronal mortality and reversing blood-brain barrier disruption and brain ***,YL-0919 effectively combated oxidative stress both in vivo and in *** protective effects of YL-0919 were partially inhibited by *** results indicated that YL-0919 relieved impairments in motor and spatial cognition by restraining oxidative stress,a neuroprotective effect that was partially reversed by the sigma-1 receptor antagonist ***-0919 may have potential as a new treatment for traumatic brain injury.

关键词： antidepressant drug blood-brain barrier cognitive function hypidone hydrochloride(YL-0919) neurological function nuclear factor-erythroid 2 related factor 2 oxidative stress sigma-1 receptor superoxide dismutase traumatic brain injury

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运营地铁盾构隧道基底沉降的影响因素分析

水文地质工程地质 2024年第4期51卷 157-166页

作者：徐平杨益新朱志豪郑州大学水利与交通学院河南郑州450001 上海建工集团股份有限公司上海200080 上海隧道工程有限公司上海200032

隧道基底沉降不仅影响地铁列车的正常运行和乘客的舒适性,严重时会造成隧道结构病害,目前的研究主要集中在长期沉降预测和单因素影响分析,非常有必要开展隧道基底沉降的多影响因素分析。以郑州地铁1号线某盾构隧道区间为工程实例,构建... 详细信息

隧道基底沉降不仅影响地铁列车的正常运行和乘客的舒适性,严重时会造成隧道结构病害,目前的研究主要集中在长期沉降预测和单因素影响分析,非常有必要开展隧道基底沉降的多影响因素分析。以郑州地铁1号线某盾构隧道区间为工程实例,构建三维有限元数值模型,采用人工激振力模拟地铁列车竖向荷载,提取数值模拟结果的动应力和静偏应力数据,引入循环荷载作用下累积塑性应变计算公式,采用分层总和法计算得到隧道基底沉降,研究了隧道周围土层性质、道床脱空深度和地铁列车运行速度等因素对隧道基底沉降的影响,研究结果表明:数值模拟的隧道基底沉降和发展规律与现场实测结果具有较高的吻合度,验证了有限元模拟的准确性;隧道基底沉降随着周围土层砂粒含量的提高而减小;道床脱空尺寸会加剧隧道和道床板中应力集中和振动放大现象,增大隧道下卧土层的动偏应力和基底沉降;提高车速会增大基底沉降的横向影响范围;采用正交试验法、极差分析法和方差分析法得到了隧道沉降对各因素的敏感性,从大到小依次为:土层性质、车速和道床脱空,其中,土层性质为高度显著水平、车速为显著水平。研究成果对运营地铁盾构隧道的变形监测、安全评估和加固处理具有一定的参考价值。

关键词：土层性质道床脱空地铁列车运行速度隧道基底沉降正交分析法敏感性分析

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基于神经网络的智能电网稳定性预测模型研究

微型电脑应用 2024年第1期40卷 180-183页

作者：杨熠鑫国网宁夏电力有限公司中卫供电公司宁夏银川755000

目前,在智能电网稳定性预测方面,机器学习发挥着越来越重要的作用。鉴于传统预测模型存在多种假设和预测不精确的缺点,提出了一种基于神经网络的智能电网稳定性预测模型,该模型以前馈神经网络为基础,采用考虑反应时间的阻尼最小二乘法... 详细信息

目前,在智能电网稳定性预测方面,机器学习发挥着越来越重要的作用。鉴于传统预测模型存在多种假设和预测不精确的缺点,提出了一种基于神经网络的智能电网稳定性预测模型,该模型以前馈神经网络为基础,采用考虑反应时间的阻尼最小二乘法对数据进行训练,将消耗、生产的有功功率和弹性系数作为输入变量,对表征智能电网稳定性的特征根实部进行预测,模型在隐藏层的激活函数采用双极性S函数(tansig),输出层的激活函数采用线性传递函数(purelin)。模型采用均方误差(MSE)和决定系数(R-Square,R2)对预测模型精确性和有效性进行评估。预测结果表明,该预测模型在训练和测试阶段均具有足够准确的预测性能,在预测范围具有极低MSE值和极大R2值,对不同潮流下智能电网稳定性的预测表现出了极高的准确性。

关键词：神经网络智能电网阻尼最小二乘法激活函数稳定性预测

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后全基因组关联研究时代非综合征型唇腭裂遗传学及易感基因功能学研究策略

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中华口腔医学杂志 2024年第6期59卷 634-639页

作者：杨怡欣李沐嘉郑谦石冰贾仲林四川大学华西口腔医院唇腭裂外科口腔疾病防治全国重点实验室国家口腔医学中心国家口腔疾病临床研究中心成都610041

全基因组关联研究(GWAS)的出现推动了非综合征型唇腭裂(NSCL/P)的遗传学研究。目前由GWAS报道的NSCL/P易感区域有40余个,但这些区域内的易感位点及其功能尚不明确。在后GWAS时代,精确定位易感区域内的易感位点并探究其背后的生物学机制... 详细信息

全基因组关联研究(GWAS)的出现推动了非综合征型唇腭裂(NSCL/P)的遗传学研究。目前由GWAS报道的NSCL/P易感区域有40余个,但这些区域内的易感位点及其功能尚不明确。在后GWAS时代,精确定位易感区域内的易感位点并探究其背后的生物学机制将有助于进一步深入认识NSCL/P的遗传病因。本文结合近年相关研究进展,对后GWAS时代NSCL/P遗传学及易感基因功能学研究策略作一综述。

关键词：唇裂腭裂非综合征型唇腭裂全基因组关联研究多态性,单核苷酸功能研究

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SST湍流模型的激波与可压缩效应改进

航空学报 2024年第3期45卷 91-104页

作者：汪洪波曾宇熊大鹏杨揖心孙明波国防科技大学空天科学学院、高超声速冲压发动机技术重点实验室长沙410073

由于缺乏对某些重要流动特征的考虑,针对不可压流发展的标准SST湍流模型在描述超声速流场时存在明显的局限性。为改善SST模型在吸气式高超声速推进系统内流等复杂超声速流场中的预测精度,基于流动特征结构定向开展了激波和可压缩效应改... 详细信息

由于缺乏对某些重要流动特征的考虑,针对不可压流发展的标准SST湍流模型在描述超声速流场时存在明显的局限性。为改善SST模型在吸气式高超声速推进系统内流等复杂超声速流场中的预测精度,基于流动特征结构定向开展了激波和可压缩效应改进。通过激波/湍流边界层判别函数和可压缩效应判别函数定位标准SST模型参数或建模假设失效的区域,针对性地改进湍流模型。采用超声速平板边界层流动、超声速压缩拐角分离流动、超声速隔离段复杂激波串流动以及HIFiRE-2超声速内流等算例进行了测试,结果表明改进模型具有与标准SST模型一致的边界层预测能力,但显著提高了对激波干扰流动及逆压分离流的预测精度。

关键词： SST 湍流模型激波可压缩结构特征