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A new route for the synthesis of ω-acyl carboxylic acids

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Chinese Journal of Chemistry 1991年第5期9卷 458-460页

作者： WU Shi-hui ZHANG Zhi-Yi ma zhen-Yong Department of Chemistry Fudan UniversityShanghai 200433

A new method for synthesis of ω-acyl carboxylic acids is described. Photooxygenation of cyclic silyl enol ethers sensitized by 9,10-dicyanoanthracene (DCA) provided ω-acyl carboxylic acids in modest to good yields.

关键词： A new route for the synthesis of DCA acyl carboxylic acids

B Vitamins Supplementation Can Improve Cognitive Functions and may Relate to the Enhancement of Transketolase Activity in A Rat Model of Cognitive Impairment Associated with High-fat Diets

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Current Medical Science 2021年第5期41卷 847-856页

作者： Ying zhenG Zhi-yong CHEN Wen-jun ma Qiu-zhen WANG hui LIANG Ai-guo ma Department of Nutrition Guangdong Provincial People's HospitalGuangdong Academy of Medical SciencesGuangzhou 510080China Second School of Clinical Medicine Southern Medical UniversityGuangzhou 510080China Institute of Nutrition and Health Medical College of Qingdao UniversityQingdao 266021China

Objective:To determine whether B vitamin treatment was sufficient to reduce cognitive impairment associated with high-fat diets in rats and to modulate transketolase(TK)expression and ***:To test this,we separated 50 rats into five groups that were either fed a standard chow diet(controls)or a high-fat diet(experimental groups HO,HI,H2,and H3).HO group animals received no additional dietary supplementation,while H1 group animals were administered 100 mg/kg body weight(BW)thiamine,100 mg/kg BW riboflavin,and 250 mg/kg BW niacin each day,and group H2 animals received daily doses of 100 mg/kg BW pyridoxine,100 mg/kg BW cobalamin,and 5 mg/kg BW *** in the H3 group received the B vitamin regimens administered to both H1 and H2 each ***:Over time,group HO exhibited greater increases in BW and fat mass relative to other *** spatial and memory capabilities in these animals were evaluated via conditioned taste aversion(CTA)and Morris Water maze(MWM),we found B vitamin treatment was associated with significant improvements relative to untreated HO ***,B vitamin supplementation was associated with elevated TK expression in erythrocytes and hypothalamus of treated animals relative to those in HO(Pmay be a beneficial method for reducing cognitive dysfunction in clinical settings associated with high-fat diets.

关键词： B vitamins obesity conditioned taste aversion Morris water maze cognition transketolase

Optimal topology design of replaceable bar dampers of a reticulated shell based on sensitivity analysis

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Earthquake Engineering and Engineering Vibration 2014年第1期13卷 113-124页

作者： Yang Yang ma hui College of Naval Architecture Dalian University of Technology College of Resource and Civil Engineering Northeastern University

In this study,a method for control of reticulated shells is proposed and its practicality is *** control is implemented by replacing selected bars of the shell with passive viscoelastic *** applying the eigenvalue perturbation technique and the earthquake spectrum concept,the sensitivities of various topologies of the shell are analyzed,and the optimal topology is determined by taking their symmetries into *** results of this research show that common damper topologies are not effective for all types of responses and recorded *** optimal topology identifi ed requires a minimal number of dampers for each type of earthquake *** displacement control effect of the dynamic responses of the optimal topology is 10% – 20%; the acceleration control effect is also about 10% – 20%; and the axial force control effect is as much as 30% – 45%.Furthermore,the incremental dynamic analysis(IDA) method is used to investigate the stability of the controlled *** results show that the dynamic stability of the controlled shell is well preserved when it is vibrated under vibration and is better than the uncontrolled *** ultimate load increased by 10% and the elements entered into the plastic stage when the peak acceleration reached 580 Gal,which is 200 Gal larger than the uncontrolled shell.

关键词： topology optimization reticulated shells failure analysis sensitivity analysis replaceable elements

Electron Transfer Reaction Between Desoxyadenosine and Triplet 2-Methyl-1,4-naphthaquinone:A Laser Photolysis Study

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Chemical Research in Chinese Universities 2006年第3期22卷 397-399页

作者： ma Jian-hua LIN Wei-zhen HAN zhen-hui YAO Si-de LIN Nian-yun College of Biology Engineering Jimei University Xiamen 361021 P. R. China Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 P. R. China

Introduction Electron transfer oxidation of DNA by triplet artificial photonuclease reveals a bright prospect of its application in biology and medicine. Both molecular orbital calculation and laser experiments have indicated that the homo guanine sequence should be the final localization site of photoexcited hole via long range migration within DNA. However, the direct observation of the produced ion pairs of biomolecules especially the stabilized radical cation DNA or its components is hampered by the overwhelming transient absorption of protonated radical anion of photosensitizers, such as 2-methyl-1,4-naphthaguinonel （MQ）.

关键词： Electron transfer reaction 2-Methyl-1,4-naphthaquinone Desoxyadenosine Laser photolysis

From blocker to booster:Harnessing garnet surface chemistry for advanced solid-state electrolytes

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Nano Research 2025年第1期18卷 323-331页

作者： Jun Cheng Xuan Zhou Hongqiang Zhang zhen Zeng Yuanyuan Li Yulong Zhu Yingsheng Liao Lijie Ci Deping Li State Key Laboratory of Precision Welding and Joining of materials and Structures School of Materials Science and EngineeringHarbin Institute of Technology(Shenzhen)Shenzhen 518055China

Garnet electrolytes with high ionic conductivity and electrochemical stability are widely used as fillers to fabricate composite solid electrolytes(CPEs)within polymer ***,the performance of CPEs is significantly influenced by the surface characteristics of the garnet ***,the impact of garnet surface characteristics on CPEs was systematically investigated and a conversion from a typically unstable and Lewis basic surface to a more stable Lewis acidic surface was realized,which is shown to be more conductive to the improved performance of *** simultaneously removing the Li_(2)CO_(3)layer and applying a Li-Al-O coating,the influence of surface characteristics on CPEs was *** Lewis acid Li-Al-O surface coating not only promotes lithium salt dissociation,improving the ionic conductivity and ionic transfer number,but also prevents the reformation of the passive Lewis basic Li_(2)CO_(3)*** to garnet with a Lewis basic Li_(2)CO_(3)surface,the garnet modified with a Lewis acid Li-Al-O coating enhances CPEs,which exhibit an improved critical current density of 1.0 ma·cm^(-2)and highly stable lithium symmetric cell cycling for 400 h at 0.2 ma·cm^(-2).This research highlights the importance of surface chemistry in the design of high-performance solid-state batteries and presents a strategic modification approach for garnetbased CPEs.

关键词： garnet electrolyte composite solid electrolyte surface chemistry all-solid-state batteries

FREE BOUNDARY VALUE PROBLEM OF ONE DIMENSIONAL TWO-PHASE LIQUID-GAS MODEL

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Acta mathematica Scientia 2012年第1期32卷 413-432页

作者： Wang zhen Zhang hui Institute of Physics and mathematics The Chinese Academy of SciencesWuhan 430071China

In this paper, we study a free boundary value problem for two-phase liquid- gas model with mass-dependent viscosity coefficient when both the initial liquid and gas masses connect to vacuum continuously. The gas is assumed to be polytropic whereas the liquid is treated as an incompressible fluid. We give the proof of the global existence and uniqueness of weak solutions whenβ∈ （0, 1）, which have improved the result of Evje and Karlsen, and we obtain the regularity of the solutions by energy method.

关键词： two-phase flow weak solutions Lagrangian coordinates free boundary prob-lem vacuum uniqueness

Cerium phosphate-supported Au catalysts for CO oxidation

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Chinese Journal of Chemical Engineering 2018年第10期26卷 2055-2063页

作者： Yulin Wang Huan Liu zhen ma Shanghai Key Lahoratory of Atmospheric Particle Pollution & Prevention ( IAP^3 ) Department of Environmental Sdence & Engineering Fudan University Shanghai 200433 China

LaPO_4 and hydroxyapatite(Ca_(10)(PO_4)_6(OH)_2)are typical metal phosphates recently found to be useful for making supported metal or metal oxide catalysts,but CePO_4(also belonging to the metal phosphate family)has been rarely used to make supported *** would be interesting to develop CePO_4-supported catalysts and explore their catalytic ***,hexagonal CePO_4 nanorods(denoted as CePO_4-H),hexagonal CePO_4 nanowires(CePO_4-HNW),monoclinic CePO_4 nanoparticles(CePO_4-M),and monoclinic CePO_4 nanowires(CePO_4-MNW)prepared by different methods were used to support gold via deposition-precipitation with urea(DPU).The gold contents of these catalysts were all around 1 wt%.The catalytic activities of these Au/CePO_4 catalysts in CO oxidation were found to follow the sequence of Au/CePO_4-MNW>Au/CePO_4-HNW> Au/CePO_4-M>Au/CePO_*** catalysts were characterized by inductively coupled plasma-optical emission spectroscopy(ICP-OES),N_2 adsorption–desorption,X-ray diffraction(XRD),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS),oxygen temperature-programmed desorption(O_2-TPD),and CO_2 temperature-programmed desorption(CO_2-TPD)to find possible correlations between the physicochemical properties and catalytic activities of these catalysts.

关键词： Gold Catalysis Catalyst support CePO4 Carbon monoxide Oxidation

A New Distinguishing Attack on Grain-V1 with 111 Initialization Rounds

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Journal of Systems Science & Complexity 2019年第3期32卷 970-984页

作者： ma zhen TIAN Tian QI Wenfeng National Digital Switching System Engineering & Technological Research Center

The Grain-v1 stream cipher has been selected in the eSTREAM hardware finalists. In this paper, the authors derive a new distinguishing attack on Grain-v1 with 111 initialization rounds in a single-key setting. To achieve this goal, the authors present two delicate strategies targeting an obvious distinguishing probability of the output difference of reduced Grain-v1. The authors show that conditional differential cryptanalysis of reduced Grain-v1 with 111 initialization rounds could mount a distinguishing attack with success probability about 0.8281 for all secret keys. It is also shown that when the attacking round further increases to 112 and 113, the distributions of the output differences are nearly random. Thus far, to the best of the authors' knowledge, the attack on Grain-v1 with 111 initialization rounds is the best single-key cryptanalytic result for reduced versions of Grain-vl in terms of the number of attacking rounds.

关键词： Cryptanalysis differential cryptanalysis distinguishing attack Grain-v1 stream cipher

Surface coating of electrocatalysts boosts battery performance

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Rare Metals 2020年第6期39卷 613-615页

作者： Ji-zhen ma Jin-Tao Zhang Key Laboratory for Colloid and Interface Chemistry(Ministry of Education) School of Chemistry and Chemical EngineeringShandong UniversityJinan 250100China

Bifunctional electrocatalyst is crucial to boost the performance of a zinc-air *** electrocatalysts beyond noble metals are highly desirable to lower the energy barriers for oxygen reduction and evolution reactions in... 详细信息

关键词： battery boost alkaline