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Efficient photocatalytic reduction of CO2 to formate by a molecular noble metal-free system

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Science China Chemistry 2025年第1期68卷 152-156页

作者： Lihua Zhang Lingjing Chen huatian Shi Yue Wei gui Chen tai-Chu Lau School of Environment and Civil Engineering Research Center for Eco-environmental Engineering Dongguan University of Technology Department of Chemistry and Institute of Molecular Functional Materials City University of Hong Kong

Reducing CO2to carbon-neutral solar fuels can not only alleviate the energy demand but also mitigate the greenhouse *** present,developing an efficient non-noble metal photo/electrocatalytic system for converting CO2to a specific product beyond CO is still a big ***,we report a new cobalt complex bearing 2,2′-bi-1,10-phenanthroline ligand that can photocatalytically reduce CO2to formate （HCOO-）.Turnover number （TON） for HCOO-up to 677 with 99%selectivity can be achieved using organic dyes purpurin as photosensitizer and 1,3-dimethyl-2-phenyl-2,3-dihydro-1H-benzo[d]imidazole （BIH） as sacrificial reductant in a CO2-saturated NMP/TEA （v/v,3:1） solution under visible light *** potential electrolysis at-1.41 V （***/Ag Cl） in the presence of 12 m M Et3NHBF4also produced HCOO-with Faradaic efficiency of 39%.Spectroscopic and electrochemical studies suggest that a[CoI-H]species is the key intermediate for CO2reduction.

关键词： photocatalysis noble metal-free CO2 reduction formate cobalt hydride

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乙醇浓度对人参多糖分离的影响

东北师大学报（自然科学版） 2009年第2期41卷 154-159页

作者：朱梅毕宏涛杨威刘杨台桂花周义发北华大学化学与生物学院吉林吉林132013 东北师范大学生命科学学院吉林长春130024

研究了不同浓度的乙醇对人参多糖分离的影响.结果表明,乙醇浓度在很大程度上影响着人参多糖的分离效果和产率.通过对不同浓度乙醇提取和沉淀的多糖组成和相对分子质量的分析,得出了分离人参多糖的简便方法:依次用体积分数为70%,50%,30%... 详细信息

研究了不同浓度的乙醇对人参多糖分离的影响.结果表明,乙醇浓度在很大程度上影响着人参多糖的分离效果和产率.通过对不同浓度乙醇提取和沉淀的多糖组成和相对分子质量的分析,得出了分离人参多糖的简便方法:依次用体积分数为70%,50%,30%的乙醇和蒸馏水提取,经大孔树脂和透析分离,可分别得到皂甙、单寡糖、中性多糖和酸性多糖;人参水提取液经40%,60%,70%的乙醇分步醇沉,可分别得到不同相对分子质量的多糖和单寡糖.

关键词：人参多糖索氏提取法乙醇分级人参寡糖

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人参水提物对小鼠血糖及血脂代谢的影响

东北师大学报（自然科学版） 2009年第4期41卷 112-115页

作者：陈艳刘杨高晓鸽台桂花周义发东北师范大学生命科学学院吉林长春130024 白城市医学高等专科学校吉林白城137000 北华大学生命科学研究中心吉林吉林132013

研究了人参水提物对正常小鼠血糖和血脂代谢的影响及其对四氧嘧啶(ALX)致糖尿病小鼠降血糖的作用.实验证实,200和400 mg/kg人参水提物极显著地降低了血糖;100mg/kg水提物能够显著降低血清甘油三酯(P<0.05),且随着剂量的增加,呈现上升的... 详细信息

研究了人参水提物对正常小鼠血糖和血脂代谢的影响及其对四氧嘧啶(ALX)致糖尿病小鼠降血糖的作用.实验证实,200和400 mg/kg人参水提物极显著地降低了血糖;100mg/kg水提物能够显著降低血清甘油三酯(P<0.05),且随着剂量的增加,呈现上升的趋势.200与400 mg/kg人参水提物均能显著降低正常小鼠餐后30 min的血糖值(P<0.05).另外,人参水提物灌胃给糖尿病小鼠,均能降低血糖,其中300 mg/kg效果最显著(P<0.01).研究结果表明:人参水提物可能是通过促进小鼠体内的葡萄糖转化成甘油三脂,调节了物质代谢中血糖与血清甘油三酯的相互转化.同时,人参水提物还具有改善正常小鼠的葡萄糖耐量,降低糖尿病小鼠血糖值的作用.

关键词：人参水提物血糖血脂糖尿病

Universal design of three-dimensional porous graphene-iron based promotors for kinetically rationalized lithium-sulfur chemistry

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Journal of Energy Chemistry 2025年第1期100卷 192-200页

作者： hua Gao Yunfeng Zhang Menglei Wang Ruoxuan Yang Shuai Feng Xuan Cao Yaping Zhang Zhongyuan Lu Yingze Song State Key Laboratory of Environment-Friendly Energy Materials School of Materials and Chemistry Southwest University of Science and Technology School of Material Science and Engineering Henan University of Technology College of Chemistry and Chemical Engineering Taishan University

Lithium-sulfur （Li-S） batteries are widely deemed to be one of the most potential candidates for future secondary batteries because of their remarkable energy ***,notorious polysulfide shuttling and retarded sulfur reaction kinetics pose significant obstacles to the further application of Li-S *** rationally designed highly active electrocatalysts can facilitate polysulfide conversion,the universal and scalable synthesis strategies need to be ***,a universal synthetic strategy to construct a series of three-dimensional （3D） porous graphene-iron （3DGr-Fe） based electrocatalysts involving 3DGr-FeP,3DGr-Fe3C,and 3DGr-Fe3Se4is exploited for manipulating the Li-S redox *** has been observed that the implementation of a 3D porous Gr architecture leads to the well-designed conductive networks,while the uniformly dispersed iron nanoparticles introduce an abundance of active sites,fostering the lithium polysulfide conversion,thereby bolstering the overall electrochemical *** Li-S battery with the 3DGr-Fe based electrocatalyst exhibits remarkable capacity retention of 94.8%upon 100 times at 0.2 ***,the soft-packaged Li-S pouch cell based on such a 3DGr-Fe electrocatalyst delivers superior capacity of 1060.71 mA h g-1and guarantees for the continuous 30 min work of fan *** investigation gives comprehensive insights into the design,synthesis,and mechanism of 3DGr-Fe based electrocatalysts with high activity toward efficient and durable Li-S batteries.

关键词： Redox reactions

略论新时代高校网络意识形态安全的风险挑战与应对策略

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湖北科技学院学报 2025年第1期45卷 73-79页

作者：田贵华沈思雨武汉大学马克思主义学院湖北武汉430072

高校意识形态安全作为国家安全的重要方面,对培养社会主义事业合格建设者和可靠接班人,确保高校坚持社会主义办学方向尤为重要。新时代高校网络意识形态安全面临着西方敌对势力渗透、错误社会思潮干扰、信息传播圈层化阻隔等诸多挑战。... 详细信息

高校意识形态安全作为国家安全的重要方面,对培养社会主义事业合格建设者和可靠接班人,确保高校坚持社会主义办学方向尤为重要。新时代高校网络意识形态安全面临着西方敌对势力渗透、错误社会思潮干扰、信息传播圈层化阻隔等诸多挑战。为有效应对这些风险挑战,高校亟需强化价值引领,提高抵御风险能力;建强工作队伍,构建协同育人格局;加强网络管理,营造清朗网络环境;创新方式方法,提升青年网络安全素养。

关键词：新时代高校网络意识形态安全挑战对策

Properties of Titanium isotopes in complex momentum representation within relativistic mean-field theory

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Nuclear Science and Techniques 2022年第9期33卷 93-100页

作者： tai-hua Heng Yao-Wu Chu School of Physics and Optoelectronic Engineering Anhui UniversityHefei 230601China

The self-consistent quadruple potential is deduced within the relativistic mean-field(RMF)framework and substituted into the Hamiltonian,which is calculated using the complex momentum representation(CMR).Considering even-even titanium isotopes as an example,this study investigated various properties,including the resonant states of neutron-rich nuclei in the RMF-CMR model,and used them to describe the binding *** abrupt decrease in the two-neutron separation energy(S_(2n))corresponds to the traditional magic *** resonant and bound states are simultaneously exposed in the complex moment plane,where the continuum is along the integration *** four oblate neutron-rich nuclei^(72-78)Ti are weakly bound or resonant because their Fermi energies are approximately 0 *** root-meansquare(RMS)radii of these nuclei increase suddenly compared with those of others(neutron number N<48).Moreover,^(78)Ti and^(76)Ti are determined as drip-line nucleons by the value of S_(2n) and the energy levels,***,the weak-bounded character can be represented by diffuse density probability distributions.

关键词： Resonant states Self-consistent potential Complex momentum representation

The Non-contractibility of Closed Geodesics on Finsler RP^(n)

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Acta Mathematica Sinica,English Series 2022年第1期38卷 1-21页

作者： hua gui DUAN Hui LIU School of Mathematical Sciences and LPMC Nankai UniversityTianjin 300071P.R.China School of Mathematics and Statistics Wuhan UniversityWuhan 430072P.R.China

Let(RP^(n),F)be a bumpy and irreversible Finsler n-dimensional real projective space with reversibilityλand flag curvature K satisfying(λ/1+λ)^(2) 详细信息

Let(RP^(n),F)be a bumpy and irreversible Finsler n-dimensional real projective space with reversibilityλand flag curvature K satisfying(λ/1+λ)^(2)

关键词： Closed geodesics non-contractible real projective space enhanced common index jump theorem

Finite-time stabilization of nonlocal Lipschitzian stochastic time-varying nonlinear systems with Markovian switching

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Science China(Information Sciences) 2022年第11期65卷 196-216页

作者： gui-hua ZHAO Shu-Jun LIU College of Science University of Shanghai for Science and Technology College of Mathematics Sichuan University

In this study, we investigate the stochastic finite-time stability theory and finite-time stabilization of stochastic time-varying nonlinear systems with Markovian switching in the sense of weak solutions. First,we present the stochastic finite-time stability theory under the framework of weak solutions: the existence of weak solutions and stochastic finite-time stability theorems for stochastic time-varying nonlinear systems with Markovian switching. Second, for a class of high-order stochastic nonlinear systems with Markovian switching, a finite-time stabilization controller is constructively designed, and the trivial weak solution of a closed-loop system is proven to be globally finite-time stable in probability. The effectiveness of the proposed finite-time control method is illustrated by a numerical example.

关键词： stochastic time-varying nonlinear systems Markovian switching weak solutions stochastic finite-time stability finite-time control

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Astrocytic Gap Junctions Contribute to Aberrant Neuronal Synchronization in a Mouse Model of MeCP2 Duplication Syndrome

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Neuroscience Bulletin 2022年第6期38卷 591-606页

作者： Shengnan Xia hua-tai Xu Institute of Neuroscience and State Key Laboratory of Neuroscience CAS Center for Excellence in Brain Science and Intelligence TechnologyChinese Academy of SciencesShanghai 200031China University of Chinese Academy of Seciences Beijing 100049.China Shanghai Center for Brain Science and Brain-Inspired Intelligence Technology Shanghai 201210China

Abnormal synchronous neuronal activity has been widely detected by brain imaging of autistic patients,but its underlying neural mechanism remains *** with wild-type mice,our in vivo two-photon imaging showed that transgenic(Tgl)mice over-expressing human autism risk gene MeCP2 exhibited higher neuronal synchrony in the young but lower synchrony in the adult ***-cell recording of neuronal pairs in brain slices revealed that higher neuronal synchrony in young postnatal Tgl mice was atributed mainly to more prevalent giant slow inward currents(SICs).Both in vivo and slice imaging further demonstrated more dynamic activity and higher synchrony in astrocytes from young Tgl *** astrocytic gap junctions markedly decreased the generation of SICs and overall cell synchrony in the Tgl ***,the expression level of Cx43 protein and the coupling efficiency of astrocyte gap junctions remained unchanged in Tgi ***,astrocytic gap junctions facilitate but do not act as a direct trigger for the abnormal neuronal synchrony in young Tgl mice,revealing the potential role of the astrocyte network in the pathogenesis of MeCP2 duplication syndrome.

关键词： Autism spectrum disorder Astrocyte Gap junction Neuronal synchrony MeCP2-Slow inward current Neuronal development