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Frontiers of Materials Science 2024年第1期18卷 15-28页

作者： Yang li Jia-Qi Zhou Huan-Yan Xu li-min dong Mao-Chang Cao lian-Wei Shan li-Guo Jin Xiu-Lan He Shu-Yan Qi Heilongjiang Provincial Key Laboratory of CO_(2) Resource Utilization and Energy Catalytic Materials School of Materials Science and Chemical EngineeringHarbin University of Science and TechnologyHarbin 150040China

In this work,Fe_(3)O_(4) nanoparticles(NPs)loaded inside and outside halloysite nanotubes(HNTs)were prepared and developed as the heterogeneous Fenton-like catalysts for the removal of representative organic *** results indicated that the samples with Fe_(3)O_(4) NPs loaded outside the HNTs lumen(Fe_(3)O_(4)/HNTs)and inside the HNTs lumen(Fe_(3)O_(4)@HNTs)were successfully *** samples had typical magnetic hysteresis loops,while Fe_(3)O_(4)@HNTs exhibited higher magnetization *** comparative experiments showed that Fe_(3)O_(4)@HNTs had better Fenton-like catalytic ability than that of Fe_(3)O_(4)/HNTs in the degradation of various organic *** Rhodamine B(RhB)as an example,the adsorption thermodynamics and kinetics of RhB onto Fe_(3)O_(4)/HNTs and Fe_(3)O_(4)@HNTs were also *** comparative results demonstrated that the adsorption ability of Fe_(3)O_(4)/HNTs was better than that of Fe_(3)O_(4)@***,the dissolved concentration of Fe^(2+)and production amount of hydroxyl radical(·OH)in the Fe_(3)O_(4)@HNTs-H_(2)O_(2) system were significantly higher than those in the Fe_(3)O_(4)/HNTs-H_(2)O_(2) *** on aforementioned comparison,the nano-confinement effect in the Fe_(3)O_(4)@HNTs-H_(2)O_(2) system was *** work provides meaningful guidance for the cheap and convenient design of nanoreactors for Fenton-like applications.

关键词： Fe_(3)O_(4) halloysite nanotube adsorption Fenton-like reaction mechanism

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新质生产力的丰富内涵、生成逻辑与当代意蕴

技术经济与管理研究 2024年第4期 8-13页

作者：李东民郭文北京银行博士后科研工作站北京100033 清华大学五道口金融学院北京100083 北京银行北京100033

在当今飞速发展的科技时代,深刻理解领悟和发展新质生产力成为我国经济发展的关键。新质生产力的基本内涵包括:劳动者素质得到进一步提升,劳动资料得到进一步优化配置,劳动对象更加精准和个性化。其特征包括:以创新为主导、以新发展理... 详细信息

在当今飞速发展的科技时代,深刻理解领悟和发展新质生产力成为我国经济发展的关键。新质生产力的基本内涵包括:劳动者素质得到进一步提升,劳动资料得到进一步优化配置,劳动对象更加精准和个性化。其特征包括:以创新为主导、以新发展理念为指导。新质生产力生成的理论逻辑为马克思主义的生产力理论进一步发展,实践逻辑为源于技术的革命性突破,对生产要素创新性配置的深刻理解与实践及源自产业的深度转型升级,是社会经济结构不断发展的必然体现。新质生产力推动着产业升级和转型,改变就业格局和人才需求,对人类生活方式具有深刻影响,为全球经济合作提供了新机遇。因此,我国应进一步增强科技创新力度、加强产业协同、注重人才培养、强化国际合作。

关键词：新质生产力马克思主义生产力理论科技创新人才培养

Robustness Design for CNN Templates with Performance of Extracting Closed Domain

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Communications in Theoretical Physics 2006年第1期45卷 189-192页

作者： li Wei-dong min Le-Quan Applied Science School and Information Engineering School University of Science and Technology Beijing Beijing100083 China

The cellular neural/nonlinear network （CNN） is a powerful tool for image and video signal processing, robotic and biological visions. This paper introduces a kind of CNNs with performance of extracting closed domains in binary images, and gives a general method for designing templates of such a kind of CNNs. One theorem provides parameter inequalities for determining parameter intervals for implementing prescribed image processing functions, respectively. Examples for extracting closed domains in binary scale images are given.

关键词： cellular neural network robustness template design extractions of closed domains.

Fluorescence and preparation of Sr_2(P_2O_7 ):Ce,Tb phosphate by co-precipitation method

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Rare Metals 2013年第4期32卷 420-424页

作者： Cheng-Guo Ma Wei Zheng li-Guo Jin li-min dong School of Material Science & Engineering Harbin University of Science and Technology

The micron-sized Sr2（P2OT）：Ce,Tb green phosphors were prepared by being annealed at different temperatures with its precursors synthesized by co-pre-cipitates of （NH4）2HPO4 at ambient temperature. The phase structure, grain size, surface morphology, and luminescent properties of phosphors were investigated by X-ray diffraction, scanning electron microscope, trans-mission electron microscope, and fluorescence spectrum. The results show that the product of precursor annealed at 1,100 ℃ is Sr2（P2O7）：Ce,Tb, which belongs to ortho-rhombic phase. The powder is spherical and the size dis-tribution is in micron grade. The sample with the molar ratio of Sr/Tb/Ce of 100.0：0.4：0.6 shows the best fluores-cence effect annealed at 1,100 ℃ for 3 h. The phosphors produce green fluorescence by being excitated with ultra-violet radiation of 254 nm wavelength, and the main emission peak is at 547 nm. The Sr2（P2O7）：Ce,Tb phos-phors synthesized by co-precipitation method of precursors at ambient temperature is a kind of efficient green-emitting phosphors.

关键词： Phosphors Co-precipitation method Rareearth phosphate Phosphorescence

Effect of Sintering Conditions on Structure of Manganese Zinc Ferrite Powders

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Chinese Journal of Aeronautics 2006年第B12期19卷 179-182页

作者： dong li-min HAN Zhi-dong WU Ze ZHANG Xian-you College of Materials Science and Engineering Harbin University of Science and Technology Harbin 150040 China

The structures of the Mn-Zn ferrites synthesized under different sintering conditions by the sol-gel method were investigated by the X-ray diffraction （XRD） and the scanning electron microscopy （SEM） with focus on two factors： the pre-sintering treatment and the calcining time. The results show that the sintering conditions have significant effects on the structures and the particle size of the Mn-Zn ferrites. Compared with the products without pre-sintering, those pre-sintered at 500℃ have a single phase and no diffraction peaks of Fe2O3 that could be found. The effects of the pre-sintering temperature on the structures of the ferrites were also studied. As a result, 500℃ proves to be the favorite in the pre-sintering treatment. The XRD patterns of the ferrites calcined at 1 200℃ for 6 h will present diffraction peaks of pure crystallization of spinel phase while those for 2 h or 4 h will show peaks of Fe2O3. The SEM also bears witness to well-grown grains of pure Mn-Zn ferrites if calcined for 6 hours.

关键词： manganese zinc ferrite spinel sol-gel sintering time

Effects of Zr Content on the Microstructures and Tensile Properties of Ti-3Al-8V-6Cr-4Mo-xZr Alloys

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Acta Metallurgica Sinica(English Letters) 2016年第8期29卷 722-726页

作者： Hong-Bo Ba li-min dong Zhi-Qiang Zhang dong-Sheng Xu Rui Yang Institute of Metal Research Chinese Academy of Sciences School of Material Science and Engineering Liaoning University of Technology

The microstructural evolution and tensile properties of Ti-3Al-8V-6Cr-4Mo-xZr（x = 0,2,4 and 6） titanium alloys were *** precipitated phases and tensile fracture morphologies were observed using scanning electron microscopy and transmission electron *** results show that the presence of trace impurity Si and the addition of Zr induce the formation of（TiZr）_6Si_3 *** quantity of silicides increases with Zr content *** dispersed silicides refined the grain size of β Zr-containing alloys,and the grain size decreases significantly with Zr content *** these microstructural changes,the strength of the alloys is enhanced gradually with the increase of Zr content,which is attributed to the combination of precipitation strengthening and grain refinement.

关键词： Titanium alloy Microstructure Silicide Grain size Tensile properties

Enhanced photocatalytic properties of molybdenum-doped BiVO4 prepared by sol–gel method

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Rare Metals 2017年第2期36卷 129-133页

作者： Gui-lin Wang lian-Wei Shan Ze Wu li-min dong College of Material Science and Engineering Harbin University of Science and TechnologyHarbin 150040China Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province College of Chemical and Environmental EngineeringHarbin University of Science and TechnologyHarbin 150040China

Bismuth vanadate（BiVO4） has been investigated intensively and extensively due to its potential applications in the photocatalytic treatment of organiccontaining *** this study,Mo-BiVO4 samples were synthesized by a facile sol-gel *** samples were characterized by X-ray diffraction（XRD）,transmission electron microscopy（TEM）,and ultravioletvisible（UV-Vis） diffuse reflectance *** is found that the phase structure of Mo-BiVO4 photocatalyst is monoclinic *** photocatalytic activities of the obtained BiVO4 samples were investigated by means of the decolorization efficiency of methyl orange（MO）.The BiVO4 and Mo-BiVO4 photocatalysts show the response on the visible *** doped BiVO4 photocatalysts show higher decolorization efficiency than that of bare BiVO4.

关键词： BiVO4 Photocatalyst Doping Sol-gel

Delivering MC3T3-E1 cells into injectable calcium phosphate cement through alginate-chitosan microcapsules for bone tissue engineering

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2014年第4期15卷 382-392页

作者： Peng-yan QIAO Fang-fang li li-min dong Tao XU Qiu-fei XIE Department of Prosthodontics Peking University School and Hospital of Stomatology Beijing Key Lab of Fine Ceramics Institute of Nuclear and New Energy TechnologyTsinghua University Department of Preventive Dentistry Peking University School and Hospital of Stomatology National Engineering Laboratory for Digital and Material Technology of Stomatology Peking University School and Hospital of Stomatology

Objective： To deliver cells deep into injectable calcium phosphate cement（CPC） through alginate-chitosan（AC） microcapsules and investigate the biological behavior of the cells released from microcapsules into the ***： Mouse osteoblastic MC3T3-E1 cells were embedded in alginate and AC microcapsules using an electrostatic droplet *** two types of cell-encapsulating microcapsules were then mixed with a CPC ***3T3-E1 cell viability was investigated using a Wst-8 kit,and osteogenic differentiation was demonstrated by an alkaline phosphatase（ALP） activity *** attachment in CPC was observed by an environment scanning electron ***： Both alginate and AC microcapsules were able to release the encapsulated MC3T3-E1 cells when mixed with CPC *** released cells attached to the setting CPC scaffolds,survived,differentiated,and formed mineralized *** grew in the pores concomitantly created by the AC microcapsules in situ within the *** Day 21,cellular ALP activity in the AC group was approximately four times that at Day 7 and exceeded that of the alginate microcapsule group（P0.05）.Pores formed by the AC microcapsules had a diameter of several hundred microns and were spherical compared with those formed by alginate ***： AC microcapsule is a promising carrier to release seeding cells deep into an injectable CPC scaffold for bone engineering.

关键词： Injectable scaffold Calcium phosphate cement Osteoblast Microencapsulation Cell release Chitosan

Strengthened and toughened SiHfBCN-based hightemperature resistant adhesive with SiC NWs

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Chinese Journal of Aeronautics 2024年第7期37卷 539-549页

作者： Xingang LUAN Xiyue ZHU Xichao dong min li Laifei CHENG Science and Technology on Thermostructural Composite Materials Laboratory Northwestern Polytechnical UniversityXi’an 710072China

To further improve the performance of binders,a SiHfBCN-based high-temperature resistant adhesive was successfully synthesized by Polymer-Derived Ceramics(PDC)route using TiB2,Polysiloxane(PSO)and short SiC nanowires as *** effect of short SiC nanowires on the adhesive strength at room temperature and high temperature,as well as the reinforcing mechanism was *** with the adhesive without SiC nanowires,after curing(at 170℃)and pyrolysis(at 1000℃)in air,the appropriate adding of SiC nanowires upgrades the room temperature and high temperature(at 1000℃ in air)adhesive strength to(12.50±0.67)MPa(up by about 32%)and(13.11±0.79)MPa(up by about 106%),***,under the synergistic impact of the nanowire bridging,nanowire breaking,nanowire drawing and crack deflection,the optimized adhesive exhibits multi-stage fracture,causing the increscent fracture displacement.

关键词： High-temperature resistant adhesive SiHfBCN SiC NWs Strengthening Toughening

Novel carbon nanohybrids as highly efficient magnetic resonance imaging contrast agents

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Nano Research 2015年第4期8卷 1259-1268页

作者： Rongli Cui Juan li Huan Huang mingyi Zhang Xihong Guo Yanan Chang min li Jinquan dong Baoyun Sun Gengmei Xing CAS Key Laboratory for Biomedical Effects of Nanomaterial & Nanosafety Institute of High Energy Physics Chinese Academy otScience (CAS) Beijing 700049 China

Novel carbon nanohybrids based on unmodified metallofullerenes have been successfully fabricated for use as a new magnetic resonance imaging （MRI） contrast agent. The nanohybrids showed higher R1 relaxivity and better brightening effect than Gd@C82（OH）x, in Tl-weighted MR images in vivo. This is a result of the proton relaxivity from the original gadofullerenes, which retained a perfect carbon cage structure and so might completely avoid the release of Gd^3＋ ions. A ＂secondary spin-electron transfer＂ relaxation mechanism was proposed to explain how the encaged Gd^3＋ ions of carbon nanohybrids interact with the surrounding water molecules. This approach opens new opportunities for developing highly efficient and low toxicity MRI contrast agents.

关键词： graphene oxide metallofullerene magnetic resonanceimaging (MRI) nanohybrids