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A versatile solution-phase, precursor route to surface-mazelike hierarchical structures

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Science China Chemistry 2015年第4期58卷 620-626页

作者： ji ma Lianchao Han Kezheng Chen Lab of Functional and Biomedical Nanomaterials College of materials Science and Engineering Qingdao University of Science and Technology

In this work, surface-mazelike Zn O, Cu, and Ni hierarchical structures were synthesized via a versatile ethylene glycol- mediated solvothermal method. The structure evolution of these materials bore striking similarities, including(1) initial formation of metal alkoxides precursors and(2) subsequent structural evolution of products from tiered plates to jigsaw puzzles; then to extrusion ridges, nests and spindles; and thereafter to final mazelike structures driven by persistent thermal decomposition of preformed precursors. Based on their unique surface morphologies in sinuous asymmetry, it is anticipated that such mazelike hierarchical structures may shed new light on the development of morphology-controlled adsorption and heterogeneous catalysts.

关键词： hierarchical structure versatile precursor route mazelike solvothermal adsorption

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

A Separation Theorem for Stochastic Singular Linear Quadratic Control Problem with Partial Information

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Acta mathematicae Applicatae Sinica 2013年第2期29卷 303-314页

作者： Hong-ji ma Ting HOU College of Science Shandong University of Science and Technology Department of Systems and Control Beijing University of Aeronautics and Astronautics

In this paper, we provide a separation theorem for the singular linear quadratic （LQ） control problem of ItS-type linear systems in the case of the state being partially observable. Above all, the Kalmam Bucy filtering of the dynamics is given by means of Girsanov transformation, by which the suboptimal feedback control of the LQ problem is determined. Furthermore, it is shown that the well-posedness of the LQ problem is equivalent to the solvability of a generalized differential Riccati equation （GDRE）.

关键词： singular optimal control Kalman-Bucy filtering separation theorem linear systems generalizeddifferential Riccati equation

Efficiency of Profinite Rigidity of Triangle Groups

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Acta mathematica Sinica,English Series 2022年第10期38卷 1939-1948页

作者： ji Ming ma Zi Xi WANG School of mathematical Sciences Fudan UniversityShanghai 200433P.R.China

It is already known that finitely-generated Fuchsian groups are profinitely rigid among all lattices of connected Lie groups by the result of Bridson,Conder and *** the triangle groups are distinguished among themselves by their finite *** focus on the question about quantifying the size of a quotient which separates two triangle groups and give an explicit upper bound.

关键词： Triangle groups profinite completion finite quotients

Effect of cholesterol metabolism on hepatolithiasis

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World Journal of Gastroenterology 2025年第1期31卷 157-162页

作者： Lin Zheng Zi-Yu Ye Jun-ji ma Department of Gastroenterology The Second Hospital of Hebei Medical UniversityHebei Key Laboratory of GastroenterologyHebei Institute of GastroenterologyHebei Clinical Research Center for Digestive DiseasesNo.215 Heping West RoadShijiazhuang 050000Hebei ProvinceChina

Surgical intervention is currently the primary treatment for hepatolithiasis;how-ever,some patients still experience residual stones and high recurrence rates after *** metabolism seems to play an important role in hepatoli-thiasis pathogenesis.A high cholesterol diet is one of the significant reasons for the increasing incidence of ***,regular diet and appropriate medical intervention are crucial measures to prevent hepatolithiasis and reduce recurrence rate after *** dietary cholesterol and drugs that increase cholesterol stone solubility are key therapeutic approaches in treating *** article discusses the cholesterol metabolic pathways related to the pathogenesis of hepatolithiasis,as well as food intake and targeted therapeutic drugs.

关键词： Hepatolithiasis Cholesterol metabolism High-fat diet 3-hydroxy-3-methylglutaryl-coenzyme A reductase Interlobular bile duct

Impact of Morphology of Conductive Agent and Anode material on Lithium Storage Properties

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Nano-Micro Letters 2015年第4期7卷 360-367页

作者： Xiaobing Zhang ji ma Kezheng Chen Lab of Functional and Biomedical Nanomaterials College of Materials Science and Engineering Qingdao University of Science and Technology

In this study,the impact of morphology of conductive agent and anode material(Fe3O4)on lithium storage properties was throughly *** and belt-like Fe3O4active materials were separately blended with two kinds of conductive agents(i.e.,granular acetylene black and multi-walled carbon nanotube)as anodes in lithium-ion batteries(LIBs),*** was found that the morphology of conductive agent is of utmost importance in determining LIBs storage *** contrast,not as the way we anticipated,the morphology of anode material merely plays a subordinate role in their electrochemical ***,the morphology-matching principle of electrode materials was discussed so as to render their utilization more rational and effective in LIBs.

关键词： Lithium-ion batteries Morphology Conductive agent Anode material

Spectral Studies on the Conformational Transitions of Bovine Insulin During Denaturant-induced Unfolding

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Chemical Research in Chinese Universities 2014年第2期30卷 222-227页

作者： ji Xu ma Xiaojuan BIAN Liujiao College of Life Science Northwest University Xi@@an 710069 P.R.China

Transitions among various molecule states and conformational changes of bovine insulin were investigated under different denaturing conditions by means of fluorescence phase diagrams,fluorescence quenching,1-anilinonaphthalene-8-sulfonate（ANS） binding assay and circular dichroism（CD） *** both guanidine hydrochloride（GuHCl）-and urea-denatured procedures,the spatial structure of insulin molecules changed from ordered states to relative unordered ones with the increasing of denaturant *** GuHCl-denatured process followed a four-state model,for there were two intermediates existed in 2.0 and 6.0 mol/L GuHC1,*** I1 is more compact than the normal *** intermediate I2 has lost most of the secondary *** GuHCl concentration was above 6.0 mol/L,the fluorophores originally existed in the internal of insulin molecules would expose to the ***,the urea-denatured process followed a three-state model,only one intermediate existed in 2.5 mol/L *** the urea-denatured procedure,the fluorophores originally existed in theinternal of insulin molecules didn＇t expose to the surface.

关键词： Bovine insulin Unfolding Intermediate Guanidine hydrochloride Urea

Formation mechanism and magnetic properties of three different hematite nanostructures synthesized by one-step hydrothermal procedure

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Science China Chemistry 2011年第10期54卷 1607-1614页

作者： LIU ChunTing ma ji LIU YuLiang College of materials Science and Engineering Qingdao University of Science and Technology Qingdao 266061 China School of materials Science and Engineering Henan University of Science and Technology Luoyang 471003 China

The spindle-like, tubular, and tire-like hematite were successively fabricated by a facile, one-step hydrothermal procedure, which is of great importance in facilitating the controllable-synthesis process of commercial industrialization. A mechanism involving a formation-dissolution process was proposed based on the X-ray diffraction, scanning electron microscopy, trans-mission electron microscopy, and high-resolution transmission electron microscopy analysis. It was demonstrated that the presence of phosphate ions during the reaction process is crucial to the morphology evolution of hematite. Their different ad-sorption ability on the different crystallographic planes of hematite and a coordination effect with ferric ions could promote the preferential dissolution of the spindle-like hematite precursors along the long axis [001] from the tips down to the interior, and thus yield the tubular and tire-like hematite one by one with the increasing reaction time. The magnetic measurements have also been performed to investigate the different magnetic properties such as coercivity and low-temperature transition behavior of three different hematite nanostructures.

关键词： hematite (-Fe2O3) hydrothermal synthesis nanospindle nanotube nanotire

Enhancing oxygen reduction reaction of Pt-Co/C nanocatalysts via synergetic effect between Pt and Co prepared by one-pot synthesis

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Rare Metals 2023年第1期42卷 146-154页

作者： Yun-Feng Wu ji-Wei ma Yun-Hui Huang School of materials Science and Engineering Tongji UniversityShanghai201804China School of materials Science and Engineering Huazhong University of Science and TechnologyWuhan430074China

Designing highly active and durable electrocatalysts towards oxygen reduction reaction(ORR)plays a paramount importance for proton exchange membrane fuel ***-based binary alloys Pt-M(M=3d-transition metals)possessing excellent electronic and geometric properties have received increasing interests as highly active ***,we report a series of Pt_(x)Co/C(x=1,2,3)catalysts by a facile one-pot soft-chemistry *** the acidic conditions,the mass activities of PtCo/C,Pt_(2)Co/C and Pt_(3)Co/C are 0.526,0.462 and 0.441 A·mgPt^(-1),which are 2.60,2.31 and 2.22 times higher than that of Pt/C(0.200 A·mgPt^(-1)),*** specific activities of PtCo/C,Pt_(2)Co/C and Pt_(3)Co/C are 706.59,679.41 and 801.83μA·cm^(-2),which are accordingly 2.89,2.76 and 3.28 times higher than that of Pt/C(244.75μA·cm^(-2)).Notably,Pt_(3)Co/C shows a remarkable *** 5000 cycles of the accelerated durability testing,the mass activity and specific activity of Pt_(3)Co/C catalyst are 2.47 and 3.80 times higher than that of the commercial Pt/C,*** improved ORR activity and durability can be ascribed to the synergistic interaction between Pt and Co.

关键词： Proton exchange membrane fuel cells(PEMFCs) Pt_(x)Co/C catalysts Synergetic effect Oxygen reduction reaction(ORR) One-pot synthesis