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Gradient Estimates for a Nonlinear Parabolic Equation with Diffusion on Complete Noncompact manifolds

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Chinese Annals of mathematics,Series B 2015年第1期36卷 57-66页

作者： liang ZHAO Zongwei ma Department of mathematics Nanjing University of Aeronautics and Astronautics College of mathematics Physics and Information Engineering Jiaxing University

The authors obtain some gradient estimates for positive solutions to the following nonlinear parabolic equation:αu/αt=△u-b(x,t)u~σ on complete noncompact manifolds with Ricci curvature bounded from below,where 0<... 详细信息

关键词： Gradient estimates Positive solutions Harnack inequality

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magnesium-containing pellet regulating blast furnace ferrous burden interaction:softening-melting behavior and mechanism

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Journal of Iron and Steel Research International 2024年第7期31卷 1623-1635页

作者： Li-ming ma Jian-liang Zhang Yao-zu Wang Xiao-yong ma Gui-lin Wang Zhuo Li Hui-qing Jiang Zheng-jian Liu School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China School of Intelligence Science and Technology University of Science and Technology BeijingBeijing 100083China Lingyuan Iron and Steel Group Co. Lingyuan 122500LiaoningChina

MgO participates in all stages of sintering,pelletizing,and blast furnace ironmaking,and synergistically optimizing the distribution of MgO in ferrous burden can effectively enhance the interaction within the ferrous burdens and optimize the softening-melting properties of the mixed ***-containing pellets mixed with low-MgO sinter or mixed with high-MgO sinter in the blast furnace ferrous burden structure have opposite softening-melting performance *** the structure of the ferrous burden is magnesium-containing pellets mixed with low-MgO sinter,the magnesium-containing pellets can enhance the interaction of the ferrous burden in the process of softening-melting,which can optimize the composition of the slag phase and improve the slag *** the structure of the ferrous burden is magnesium-containing pellets mixed with high-MgO sinter,the magnesium-containing pellets weaken the interaction of the ferrous burden in the process of softening-melting,increase the content of the high melting point solid-phase particles in the slag,lead to an increase in the viscosity of the slag and difficult separation of the slag and iron,and decrease the permeability of the charge ***,to ensure good permeability of the mixed burden,the following measures are suggested:optimizing the MgO distribution of the ferrous burden,reducing the MgO content of the sinter to 1.96 wt.%,increasing the MgO content of the pellets to 1.03-1.30 wt.%,controlling the MgO/Al_(2)O_(3) ratio of the mixed burden within 1.15-1.32,narrowing the position of the cohesive zone,and maintaining an S value(permeability index)of approximately 150 kPa℃.

关键词： Ironmaking Ferrous burden Softening-melting property Interaction Permeability Slag

In-situ synthesis,microstructure,and properties of NbB_(2)-NbC-Al_(2)O_(3)composite coatings by plasma spraying

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Journal of Advanced Ceramics 2022年第8期11卷 1263-1278页

作者： Xiaolong WANG yong YANG Shitong JIA Yanwei WANG Yuduo ma Yuhang CUI Xingyu WANG Wenwei SUN liang WANG Key Lab.for New Type of Functional materials in Hebei Province School of Materials Science and EngineeringState Key Laboratory of Reliability and Intelligence of Electrical EquipmentTianjin Key Laboratory of Materials Laminating Fabrication and Interface Control TechnologyHebei University of TechnologyTianjin 300401China Integrated Computational materials Research Centre Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201899China

The high melting point and strong chemical bonding of NbB_(2)pose a great challenge to the preparation of high-density nanostructured NbB_(2)composite ***,we report a novel,simple,and efficient method to fabricate in-situ NbB_(2)–NbC–Al_(2)O_(3)composite coating by plasma spraying Nb_(2)O_(5)–B_(4)C–Al composite powder,aiming at realizing the higher densification and ultra-fine microstructure of NbB_(2)composite *** microstructure and properties of in-situ NbB_(2)–NbC–Al_(2)O_(3)composite coating were studied comparatively with ex-situ NbB_(2)–NbC–Al_(2)O_(3)composite coating(plasma spraying NbB_(2)–NbC–Al_(2)O_(3)composite powder).The reaction mechanism of Nb_(2)O_(5)–B_(4)C–Al composite powder in plasma jet was analyzed in *** results showed that the in-situ nanostructured NbB_(2)–NbC–Al_(2)O_(3)composite coating presented a lower porosity and superior performance including higher microhardness,toughness and wear resistance compared to the plasma sprayed ex-situ NbB_(2)–NbC–Al_(2)O_(3)coating and other boride composite *** of the in-situ NbB_(2)–NbC–Al_(2)O_(3)coating was attributed to the low melting point of Nb_(2)O_(5)–B_(4)C–Al composite powder and the exothermic effect of in-situ *** superior performance was ascribed to the density improvement and the strengthening and toughening effect of the nanosized *** in-situ reaction path could be expressed as:Nb_(2)O_(5)+Al®Nb+Al_(2)O_(3),and Nb+B_(4)C®NbB_(2)+NbC.

关键词： NbB_(2)-NbC-Al_(2)O_(3)composite coating plasma spray in-situ synthesis Nb_(2)O_(5)-B_(4)C-Al system

Integrated hetero-nanoelectrodes for plasmon-enhanced electrocatalysis of hydrogen evolution

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Nano Research 2021年第4期14卷 1195-1201页

作者： Wenyu Jiang Xianxin Wu Jinquan Chang Yanhong ma Luting Song Zhexue Chen Cheng liang Xinfeng Liu yong Zhang CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in Nanosciencet National Center for Nanoscience and TechnologyBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China CAS Key Laboratory of Standardization and Measurement for Nanotechnobgy CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China

Hetero-nanostructures of plasmonic metals and semiconductors have attracted increasing attention in the field of ***,most of the hetero-nanostructured catalysts are randomly arranged and therefore require comprehensive structural design for optimizing their ***,we report the robust construction of hierarchical hetero-nanostructures where gold(Au)nanorods and molybdenum disulfide(Mo S_(2))quantum sheets(QSs)are integrated in highly ordered *** construction is achieved through porous anodic alumina(PAA)template-assisted *** as-fabricated hetero-nanostructures demonstrate exciting electrocatalysis towards hydrogen evolution reaction(HER).Both plasmon-induced hot-electron injection and plasmonic scattering/reabsorption mechanisms are determinative to the enhanced electrocatalytic ***,broadband photoresponses of HER activity in the visible range are observed,indicating their superiority compared with random *** integrated hetero-nanoelectrodes could provide a powerful platform for conversion and utilization of solar energy,meanwhile would greatly prompt the production and exploration of ordered nanoelectrodes.

关键词： nano-integration heterostructure plasmonic metal molybdenum disulfide(MoS_(2)) hydrogen evolution reaction(HER)

A surface engineering strategy for the stabilization of zinc metal anodes with montmorillonite layers toward long-life rechargeable aqueous zinc ion batteries

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Journal of Energy Chemistry 2025年第1期100卷 94-105页

作者： Wenbo Wang Ruifeng Xu Xu Zhang Peiyu Wang Bao Yang Bingjun Yang Juan Yang Kailimai Su Pengjun ma Yanan Deng Xianfeng Fan Wanjun Chen Key Laboratory for Electronic materials College of Electrical Engineering Northwest Minzu University Resource Chemistry and Energy materials Research Center State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Institute for materials and Processes School of Engineering University of Edinburgh

Rechargeable aqueous zinc-ion batteries （AZIBs） exhibit appreciable potential in the domain of electrochemical energy ***,there are serious challenges for AZIBs,for instance zinc dendrite growth,hydrogen evolution reaction （HER）,and corrosion side ***,we propose a surface engineering modification strategy for coating the montmorillonite （MMT） layer onto the surface of the Zn anode to tackle these issues,thereby achieving high cycling stability for rechargeable *** results reveal that the MMT layer on the surface of the Zn anode is able to provide ordered zincophilic channels for zinc ions migration,facilitating the reaction kinetics of zinc *** functional theory（DFT） calculations and water contact angle （CA） tests prove that MMT@Zn anode exhibits superior adsorption capacity for Zn2+and better hydrophobicity than the bare Zn anode,thereby achieving excellent cycling ***,the MMT@Zn||MMT@Zn symmetric cell holds the stable cycling over 5600 h at 0.5 ma cm-2and 0.125 m A h cm-2,even exceeding 1800 h long cycling under harsh conditions of 5 m A cm-2and 1.25 m A h *** MMT@Zn||V2O5full cell reaches over 3000 cycles at 2 A g-1with excellent rate ***,this surface engineering modification strategy for enhancing the electrochemical performance of AZIBs represents a promising application.

关键词： Hydrogen evolution reaction

Multi-receptive field interaction network for shape from polarization

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Science China(Information Sciences) 2025年第1期 394-395页

作者： Yini PENG Rui LIU Zhiyuan ZHANG Zhongyuan WANG Jiayi ma Xin TIAN Electronic Information School Wuhan University Computer Science School Wuhan University Wuhan Institute of Quantum Technology

Shape from polarization (SfP) method can use the polarization information in reflected light to estimate the surface normal of the target,which can further reconstruct the shape of the *** a simple image capture process,it can use low-cost equipment to meet a high precision imaging requirement,which can be used in remote scenes and other applications.

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田间高温对不同架式葡萄抗氧化及光合特性的影响

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核农学报 2025年第2期39卷 414-426页

作者：罗玲刘伟梁东李然马一君吕秀兰四川农业大学园艺学院四川成都611130 四川省农业科学院园艺研究所四川成都610066

为探究不同架式葡萄对自然高温热害的生理响应,以阳光玫瑰葡萄为试验材料,在夏季田间高温环境下研究V型、飞鸟型、H型三种架式对叶幕温度、叶片抗氧化系统及光合荧光参数的影响。结果表明,高温期间飞鸟架叶幕温度最低,H型架最高;高温胁... 详细信息

为探究不同架式葡萄对自然高温热害的生理响应,以阳光玫瑰葡萄为试验材料,在夏季田间高温环境下研究V型、飞鸟型、H型三种架式对叶幕温度、叶片抗氧化系统及光合荧光参数的影响。结果表明,高温期间飞鸟架叶幕温度最低,H型架最高;高温胁迫3~15 d,随着胁迫时间的延长,三种架式叶片相对电导率及丙二醛(MDA)、超氧阴离子自由基(O_(2)^(-)·)、过氧化氢(H_(2)O_(2))、游离脯氨酸、可溶性蛋白(除H型架)含量均呈逐渐上升趋势,H型架叶片可溶性蛋白含量呈先上升后下降趋势;超氧化物歧化酶(SOD)、过氧化物酶(POD)和过氧化氢酶(CAT)活性及VvSOD、VvPOD、VvCAT相对表达量呈先上升后下降趋势。光合荧光参数的日变化分析表明,午间高温下三种架式叶片净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)、最大荧光(F_(m))、最大光化学效率(F_(v)/F_(m))、潜在光化学效率(F_(v)/F_(o))、实际光化学效率(Φ_(PSII))、光化学猝灭系数(qP)和电子传递速率(ETR)降低,而胞间二氧化碳浓度(Ci)、初始荧光(F_(o))和非光化学猝灭系数(NPQ)升高。在高温环境中,飞鸟架叶片O_(2)^(-)·、H_(2)O_(2)、MDA含量及相对电导率最低,而其抗氧化酶活性及相应基因表达量、Pn、光化学效率最高。综上,飞鸟架葡萄综合耐热性更强,更适宜在南方高温栽培环境中采用。本研究结果为葡萄抗热栽培提供了理论依据。

关键词：高温架式葡萄抗氧化系统光合荧光

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Comparison of Murraya exotica and Murraya paniculata by fingerprint analysis coupled with chemometrics and network pharmacology methods

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Chinese Journal of Natural Medicines 2021年第9期19卷 713-720页

作者： liang Hai-Zhen DU Zhi-yong YUAN Shuo LU Meng-Qiu XING Jian-yong ma Qing HAN Zheng-Zhou TU Peng-Fei JIANG yong State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical SciencesPeking UniversityBeijing 100191China China Resources Sanjiu Medical&Pharmaceutical Co.Ltd. Shenzhen 518110China

There are two source plants for the traditional Chinese medicine Murrayae Folium et Cacumen(MFC)in Chinese Pharmacopoeia,*** exotica *** ***(L.)***,a chemical comparison of *** and *** by high performance liquid chromatography(HPLC)fingerprint analysis coupled with chemometrics and network pharmacology was *** main peaks in the fingerprints were identified by liquid chromatography coupled with ion trap/time-of-flight mass spectrometry(LC-IT-TOF-MS)and authenticated by *** chemometrics results showed that the HPLC fingerprints of these two species were clearly divided into two categories using hierarchical cluster analysis(HCA)and principal component analysis(PCA),and a total of 13 significantly differentiated markers were screened out by orthogonal partial least squares-discriminant analysis(OPLS-DA).However,the following network pharmacology analysis showed that these discriminated markers were found to act via many common targets and metabolic pathways,indicating the possibly similar pharmacological effects and mechanisms for *** and *** above results provide valuable evidence for the equivalent use of these two plants in clinical ***,the chromatographic fingerprint analysis coupled with chemometrics and network pharmacology supplies an efficient approach for the comparative analysis of multi-source TCMs like MFC.

关键词： Murraya exotica Murraya paniculata Multi-source TCM HPLC fingerprint Chemometrics Network pharmacology

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Effect of lentivirus-mediated integrin αVβ3-sh RNA on tumor growth of mice with lung cancer xenografts

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Asian Pacific Journal of Tropical Medicine 2016年第2期9卷 160-163页

作者： Tao liang yong-Fu ma Jian Chu Dao-Xi Wang Yang Liu Department of Thoracic Surgery Second Artillery General Hospital of Chinese PLA Department of Thoracic Surgery Chinese PLA General Hospital

Objective: To study the effect of lentivirus-mediated integrin αVβ3-sh RNA on tumor growth of mice with lung cancer xenograft. Methods: Lung cancer tissue, paracancer tissue and normal tissue were collected and integrin αVβ3 expression was detected; BALB/c nude mice were selected, divided into integrin αVβ3 knockdown group(KD group) and negative control group(NC group), and inoculated with cells stably infected by integrin αVβ3-sh RNA lentivirus and cells stably infected by negative control-sh RNA lentivirus respectively, the growth of tumor tissue was continuously observed, and the number of apoptosis cells as well as the expression of angiogenesis, apoptosis and invasion genes in tumor tissue were detected. Results: m RNA content and protein content of integrin αVβ3 in lung cancer tissue were significantly higher than those in paracancer tissue and normal tissue; increasing trend of tumor tissue volume of KD group was weaker than that of NC group, and tumor volume at various points in time of KD group was lower than that of NC group; m RNA contents and protein contents of VEGF, FGF, EGF, Bcl-2, MMP-9, MMP-12 and MMP-13 in tumor tissue of KD group were lower than those of NC group, and apoptosis index as well as m RNA content and protein content of Bax were higher than those of NC group. Conclusions: The expression of integrin αVβ3 increases in lung cancer tissue, and lentivirus-mediated integrin αVβ3-sh RNA can inhibit tumor growth of mice with lung cancer xenografts.

关键词： Lung cancer Integrin α V β 3 Xenografts Angiogenesis Apoptosis Invasion