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Removal of phenol by activated alumina bed in pulsed high-voltage electric field

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Journal of Environmental Sciences 2007年第4期19卷 409-415页

作者： ZHU Li-nan ma Jun YANG Shi-dong School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China

A new process for removing the pollutants in aqueous solution-activated alumina bed in pulsed high-voltage electric field was investigated for the removal of phenol under different conditions. The experimental results indicated the increase in removal rate with increasing applied voltage, increasing pH value of the solution, aeration, and adding Fe^2＋. The removal rate of phenol could reach 72.1% when air aeration flow rate was 1200 ml/min, and 88.2% when 0.05 mmol/L Fe^2＋ was added into the solution under the conditions of applied voltage 25 kV, initial phenol concentration of 5 mg/L, and initial pH value 5.5. The addition of sodium carbonate reduced the phenol removal rate. In the pulsed high-voltage electric field, local discharge occurred at the surface of activated alumina, which promoted phenol degradation in the thin water film. At the same time, the space-time distribution of gas-liquid phases was more uniform and the contact areas of the activated species generated from the discharge and the pollutant molecules were much wider due to the effect of the activated alumina bed. The synthetical effects of the pulsed high-voltage electric field and the activated alumina particles accelerated phenol degradation.

关键词： pulsed high-voltage electric field hybrid gas-liquid electrical discharge activated alumina phenol Fenton's reaction water treatment

Solution-phase synthesis of a muramyl dipeptide analogue MDA

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Chinese Chemical Letters 2011年第12期22卷 1443-1446页

作者： nan Zhao Yao ma Gang Liu Department of Synthetic Medicinal Chemistry Institute of Materia Medica Chinese Academy of Medical Sciences ＆ Peking Union Medical College Beijing 100050 China

The solution-phase synthesis of a muramyl dipeptide（MDP） analogue of N~α-[4-chlorocinnamoyl-L-alanyl-D-isoglutaminyl]-L-lysine （MDA,2） is reported that possesses the features of easy feasibility,safety and low co... 详细信息

关键词： Muramyl dipeptide analogue Solution-phase synthesis MDA

The Christoffel-Minkowski Problem II: Weingarten Curvature Equations

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Chinese Annals of mathematics,Series B 2006年第6期27卷 595-614页

作者： Pengfei GUAN Changshou LIN Xi＇nan ma Department of mathematics McGill University Montreai Quebec H3A 2K6 Canada Department of mathematics National Chung Cheng University Chia-Yi Taiwan China Department of mathematics University of Science and Technology of China Hefei 230026 China

In this paper the authors discuss the existence and convexity of hypersurfaces with prescribed Weingarten curvature.

关键词： Existence Convexity Weingarten curvature

Remarks on convexity estimates for solutions of the torsion problem

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Science China mathematics 2023年第5期66卷 1003-1020页

作者： Xiaohan Jia Xi-nan ma Shujun Shi School of mathematical Sciences Xiamen UniversityXiamen 361005China School of mathematical Sciences University of Science and Technology of ChinaHefei 230026China School of mathematical Sciences Harbin Normal UniversityHarbin 150025China

In this paper,for the solution of the torsion problem about the equation Δu=-2 with homogeneous Dirichlet boundary conditions in a bounded convex domain in Rn,we find a superharmonic function which implies the strict concavity of u ^(1/2) and give some convexity *** is a generalization of makar-Limanov’s result(makar-Limanov(1971))and ma-Shi-Ye’s result(ma et al.(2012)).

关键词： convexity estimate superharmonicity maximum principle torsion problem

Rac1 Signaling in Amygdala Astrocytes Regulates Fear Memory Acquisition and Retrieval

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Neuroscience Bulletin 2021年第7期37卷 947-958页

作者： Xiao-Cen Fan Chao-nan ma Jia-Chen Song Zhao-Hui Liao nan Huang Xing Liu Lan ma Department of Neurosurgery Huashan HospitalState Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain ScienceSchool of Basic Medical SciencesInstitutes of Brain ScienceFudan UniversityShanghai 200032China

The importance of astrocytes in behavior control is increasingly appreciated,but little is known about the effects of their dynamic activity in regulating learning and *** the present study,we constructed AAVs of photoactivatable and photoinactivatable Ras-related C3 botulinum toxin substrate 1(Rac1)under the mGFAP promoter,which enabled the manipulation of Rac1 activity in astrocytes by optical stimulation in free-moving *** found that both up-regulation and down-regulation of astrocytic Rac1 activity in the basolateral amygdala(BLA)attenuated memory acquisition in a fear conditioning mouse ***,neuronal activation in the BLA induced by memory acquisition was inhibited under both the up-and down-regulation of astrocytic Rac1 activity during *** terms of the impact on fear memory retrieval,we found both up-and down-regulation of BLA astrocytic Rac1 activity impaired memory retrieval of fear conditioning and memory retrieval-induced neuronal ***,the effect of astrocytic Rac1 on memory retrieval was *** results demonstrate that the normal activity of astrocytic Rac1 is necessary for the activation of neurons and memory *** activation and inactivation of astrocytic Rac1 activity in the BLA reduced the excitability of neurons,and thereby impaired fear memory acquisition and retrieval.

关键词： Rac1 Astrocyte Neuron BLA Fear memory

A Novel Defender-Attacker-Defender Model for Resilient Distributed Generator Planning with Network Reconfiguration and Demand Response

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Energy Engineering 2024年第5期121卷 1223-1243页

作者： Wenlu Ji Teng Tu nan ma nanjing Power Supply Company State Grid Jiangsu Electric Power Co.Ltd.Nanjing210019China

To improve the resilience of a distribution system against extreme weather,a fuel-based distributed generator(DG)allocation model is proposed in this *** this model,the DGs are placed at the planning *** an extreme event occurs,the controllable generators form temporary microgrids(MGs)to restore the load ***,a demand response program(DRP)mitigates the imbalance between the power supply and demand during extreme *** cope with the fault uncertainty,a robust optimization(RO)method is applied to reduce the long-term investment and short-term operation *** optimization is formulated as a tri-level defenderattacker-defender(DAD)*** the first level,decision-makers work out the DG allocation scheme;at the second level,the attacker finds the optimal attack strategy with maximum damage;and at the third level,restoration measures,namely distribution network reconfiguration(DNR)and demand response are *** problem is solved by the nested column and constraint generation(NC&CG)method and the model is validated using an IEEE 33-node *** studies validate the effectiveness and superiority of the proposed model according to the enhanced resilience and reduced cost.

关键词： Distribution system resilience defender-attacker-defender distributed generator demand response microgrids formation

Kinetics of non-catalyzed hydrolysis of tannin in high temperature liquid water

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2008年第5期9卷 401-406页

作者： Li-li LU Xiu-yang LU nan ma Institute of Pharmaceutical Engineering Department of Chemical and Biochemical Engineering Zhejiang University Hangzhou 310027 China

High temperature liquid water(HTLW) has drawn increasing attention as an environmentally benign medium for organic chemical reactions,especially acid-/base-catalyzed reactions. Non-catalyzed hydrolyses of gallotannin and tara tannin in HTLW for the simultaneous preparation of gallic acid(GA) and pyrogallol(PY) are under investigation in our laboratory. In this study,the hydrolysis kinetics of gallotannin and tara tannin were determined. The reaction is indicated to be a typical consecutive first-order one in which GA has formed as a main intermediate and PY as the final product. Selective decomposition of tannin in HTLW was proved to be possible by adjusting reaction temperature and time. The present results provide an important basic data and reference for the green preparation of GA and PY.

关键词： High temperature liquid water Gallotannin Tara tannin Non-catalyzed hydrolysis Kinetics

Thermal and Redox Dual Responsive Poly(L-glutamate)with Oligo(ethylene glycol)Side-chains

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Chinese Journal of Polymer Science 2016年第12期34卷 1436-1447页

作者： Xiao-hui Fu Yi-nan ma 孙静李志波 School of Polymer Science and Engineering Qingdao University of Science and Technology Laboratory of Polymer Physics and Chemistry Institute of Chemistry Chinese Academy of Sciences

A series of poly（L-glutamate）s grafted with oligo（ethylene glycol）（OEG） side-chains through the thioether linkages （PALGn-g-EGx, x = 2, 3 and 4） were prepared by ring-opening polymerization （ROP） of γ-allyl-L-glutamate N-carboxyanhydride （ALG-NCA） and thiol-ene photoaddition. The chemical structures and physical properties were characterized by 1H-NMR, Fourier transform infrared （FTIR）, circular dichroism （CD）, etc. The PALGn-g-EGx samples with x = 3 and 4 displayed lower critical solution temperature （LCST） in water due to the presence of OEG units. The clouding point （CP） of polypeptides can be finely tuned by changing the side chain structures, molecular weights and sample concentrations. In addition, the thioether linkages in the side chains offer additional redox-responsive properties. The influence of both OEG units and thioether linkages on the LCST behavior was systematically investigated. This work provides an efficient way to prepare multi-stimuli responsive materials with highly tunable properties.

关键词： N-carboxyanhydride (NCA) Polypeptide Ring-opening polymerization Click chemistry Stimuli-responsive.

The Neumann Problem for Parabolic Hessian Quotient Equations

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Acta mathematica Sinica,English Series 2021年第9期37卷 1313-1348页

作者： Chuan Qiang CHEN Xi nan ma De Kai ZHANG School of mathematics and Statistics Ningbo UniversityNingbo 315211P.R.China School of mathematical Sciences University of Science and Technology of ChinaHefei 230026P.R.China Shanghai Center for mathematical Sciences Fudan UniversityShanghai 200433P.R.China

In this paper,we consider the Neumann problem for parabolic Hessian quotient *** show that the k-admissible solution of the parabolic Hessian quotient equation exists for all time and converges to the smooth solution ... 详细信息

关键词： Parabolic Hessian quotient equation Neumann problem translating solution